Opening/closing device of a door member

Abstract: An opening/closing device of a door (1) for a refrig­ erator or the like according to the present invention is developed so as to open/close the door member (1) at one's desired side, namely, at the right side or at the left side, without requiring a movable operating handle therefor, in simple construction and with high adiabatic efficiency, which is simple in construction can be incorporated in the door member (1), and therefore no special mechanism is necessary to be provided in the door member (1), with no structural change required inside the door member (1).

Description: The present invention generally relates to an opening/closing device mainly for use in a door member and more particularly, to an opening/closing device of a door member of a refrigerator which is arranged to open or close the door member at either desired side of the door member. A door member of a refrigerator has been generally designed to be opened or closed only at one side, namely, either at the right side or at the left side thereof. In other words, the door member has been already destined to be operable only at the right side or only at the left side when it was manufactured. Therefore, a user has been obliged to select one of the two types of a refrigerator, one provided with the right-operable door member or the other provided with the left-operable door member, while taking considerations into the place where the refrigerator is placed. Moreover, after the purchase of the refrigerator, if it occurs that the user wishes to change the place of the refrigerator at the rearrangement, such inconveniences would be brought about that the door member would hit the wall of the room, resulting in difficulties of opening/closing of the door member, and therefore the placing position of the refrigerator has been limited in prior arts. Further, in the case where many people use the refrigerator, it may be difficult for those at the different side of their able arm to open or close the door member of the refrigerator. To avoid such inconveniences as above, various types of an opening/closing device of the door member by which the door member can be opened/closed at the desired side, that is, the double-side-operable device have been proposed up to now. Figs. 119 and 120 illustrate respectively a representative double-side operable device of the type referred to above. In the device of Fig. 119, hinge pins 20 and 20 are provided at the right and left corners of respective opposite upper and lower end portions of a door member 10. The hinge pins 20 are freely projectable upward or downward. Moreover, the hinge pins 20 are received by respective bearing recessed portions 40 each formed in a part of a main body 30 confronting to the upper or lower end portion of the door member 10. When either one of operating handles 50 provided in the door member 10 is rotated, either of the right and left hinge pins 20 are slipped off from the corresponding bearing recessed portions 40, so that the door member 10 becomes operable. Referring to the double-side-operable device shown in Fig. 120, the refrigerator has a middle frame 80 which is bored at the central part thereof and sandwiched between a main body 60 and a door member 70. The middle frame 80 is pivotally fixed to the main body 60 at one lateral side of the right and left sides thereof, and also pivotally fixed to the door member 70 at the other side thereof. When one of right and left operating handles provided in the door member 70 is rotated, only the door member 70 can be rendered openable at one side, while the door member 70 and the middle frame 80 are all together rendered openable at the other side. US-A-4,503,583 discloses an enclosure with a double acting hinge mechanism having overcenter latch which comprises a pair of right and left hinge pin means at a cabinet, engagement grooves for engaging the hinge pins in the door, a pair of latch members pivotally mounted at respective sides of the door for latching or releasing the respective hinge pin and locking means operably associated with each of said latch members. Said locking means comprises a rod being resiliently extendable and contractable caused by an incorporated string and connected to the latch members. The rod urges the latch members in a closed or released position in reaction to the movement of one of a pair of bell cranks driven by one of the pair of hinges during the opening or closing operation. US-A-4,503,583 comprises the disadvantage that the resilient rod does not allow a very smooth operation of the latch plates. US-A-3,889,419 relates to a two-way opening door for household refrigerator. A door member comprises two bolt assembles with a bolt member which is slideable into entrapping engagement with hinge pins on the left and right side of the refrigerator cabinet. SUMMARY OF THE INVENTION In the device of Fig. 119, however, a pair of the movable handles 50 are required to switch the opening side of the door member 10, and accordingly the construction of the door member becomes disadvantageously complicated. Moreover, since the door member 10 cannot be opened from inside, such a dangerous accident that an infant is confined within the main body 30 cannot be avoided. Furthermore, there is incorporated a coupling mechanism in the door member 10 for the operating handles 50 and the hinge pins 20, and therefore the adiabatic efficiency of the door member is deteriorated. Meanwhile, in the device of Fig. 120, two packings, namely, one between the main body 60 and the middle frame 80, and the other between the middle frame 80 and the door member 70 are necessitated, and consequently the whole door member becomes thick, thereby causing the deterioration of the adiabatic efficiency of the door member. Accordingly, the present invention has been developed with a view to substantially eliminating the above-described disadvantages inherent in the prior art devices, and has for its essential object to provide an opening/closing device in particular for a door member of a refrigerator which is, without requiring a movable operating handle and accordingly without necessities for the operating handle to be moved, arranged to open/close the door member at one's desired side, in simple construction and with high adiabatic efficiency of the door member. In accomplishing the above-described object, according to the present invention, an opening/closing device is comprised of a pair of right and left hinge pins protrudingly provided at the opposite right and left side portions of either one of a door member and a main body in which said door member is mounted; a fixed plate provided in the other one of said door member and said main body which has engaging grooves to be detachably engaged with said corresponding hinge pins from the opening side of the door member; a pair of latch plates rotatably provided at the opposite right and left side portions of said fixed plate each of which has a latch groove opening to the outer-diameter side of said latch plate so as to detachably engage said latch plate with said corresponding hinge pin for restricting said hinge pin in said engaging groove a pair of springs each for urging said latch plate both in a restricting position where said latch plate restricts said hinge pin and in a restriction-releasing position where said latch plate releases the restriction of said hinge pin; and a coupling means provided between said pair of latch plates which prohibits the rotation of said one latch plate in association with the rotation of said the other latch plate in the restriction-releasing direction. The above-described coupling means includes a pair of links each pivotally fixed to the fixed plate in the vicinity of corresponding latch plate and, a coupling link coupling one end portions of the links, so that each link and the corresponding latch plate are linked with each other by the engagement of a lock groove having a bend with a lock pin. According to a modified example, the coupling means is formed into a single lever-like means and pivotally fixed to the middle portion of the fixed plate in the longitudinal direction. The coupling means is linked at its right and left end portions with corresponding latch plates through the engagement of a bent lock groove with a lock pin. According to a further modified example, the coupling means is formed by a single lever-like means which is provided with lock pins at opposite right and left end portions thereof. The coupling means is associated through slide grooves formed in a crooked configuration in the fixed plate with which the lock pins are engaged and, lock grooves formed in latch plates. According to a still further modified example, the coupling means is consisted of a pair of coupling levers. Respective one end portions of the right and left coupling levers are pivotally fixed to the peripheral portion of the latch plate at the reverse side, and at respective the other end portions of the coupling means is protrudingly provided a lock pin which is guided by a slide groove formed in the fixed plate and detachably engaged with a lock groove formed in the corresponding latch plate. According to the present invention, the door member can be opened only by pulling the door member from the desired right or left side, without necessities for rotating an operating handle therefor. Therefore, the door member can be freely designed according to the present invention with no restrictions. Moreover, the door member can be opened/closed from the inside of the refrigerator according to the present invention, whereby such dangerous accident that a child be confined in the refrigerator can be prevented. Moreover, the device according to the present invention can be incorporated in the upper and lower edge portions of the door member, or in the corresponding parts of the main body, and no special mechanism is required to be provided inside the door member. Accordingly, the inner construction of the door member is enough to be unchanged, and the adiabatic efficiency is never deteriorated. As a preferred embodiment, the present invention is to provide an opening/closing device of a door member which comprises: a pair of right and left hinge pins protruding provided at the opposite right and left side portions of either one of a door member and a main body on which said door member is mounted; a fixed plate provided in the other one of said door member and said main body which has engaging grooves to be detachably engaged with said corresponding hinge pins from the opening side of the door member; a pair of latch plates rotatably provided at the opposite right and left side portions of said fixed plate each of which has a latch groove opening to the outer-diameter side of said latch plate so as to detachably engage said latch plate with said corresponding hinge pin for restricting said hinge pin in said engaging groove; a pair of springs each for urging said latch plate both in a restricting position where said latch plate restricts said hinge pin and in a restriction-releasing position where said latch plate releases the restriction of said hinge pin; and a coupling means provided between said pair of latch plates which prohibits the rotation of said one latch plate in association with the rotation of said the other latch plate in the restriction-releasing direction; said coupling means including a pair of links each pivotally fixed to said fixed plate in the vicinity of said right or left latch plate and, a coupling link coupling one end portions of said pair of links, wherein a lock groove consisting of a slide guide portion and a stopper portion is formed generally in L-shaped configuration in either one of said link and said latch plate, and a lock pin is protrudingly provided in the other one of said link and said latch plate for restricting the rotation of the latch plate through engagement with said lock groove. Also, as another preferred embodiment, the present invention is to provide an opening/closing device of a door member which comprises; hinge pins protrudingly provided at four corner portions, upper, lower, right and left corner portions of a main body on which the door member is mounted; a fixed plate provided in said door member and having engaging grooves which are detachably engageable with said hinge pins from the opening side of the door member; latch plates rotatably provided at the opposite right and left side portions of said fixed plate, each of which has a latch groove opening to the outer-diameter side of said latch plate so as to detachably engage said latch plate with said hinge pin thereby to restrict said hinge pin within said engaging groove; a coupling means for prohibiting the rotation of said one latch plate in association with the rotation of said the other latch plate of the restriction-releasing direction, and a safety means each actuated in the vicinity of said latch plate at the other side than the opening side of the door member so as to control the rotation of said latch plate at the other side than the opening side when said door member is kept opened. These and other objects and features of the present invention will become apparent from the following description taken in conjunction with preferred embodiments thereof with reference to the accompanying drawings, throughout which like parts are designated by like reference numerals, and in which: Figs. 1-9 are related to an opening/closing device of a door member according to a first embodiment of the present invention; Fig. 1 is a perspective view showing the external appearance of a refrigerator provided with the opening/closing device of a door member of the present invention; Fig. 2 is a perspective view showing the door member of the refrigerator of Fig. 1; Fig. 3 is an exploded perspective view of the opening/closing device; Fig. 4 is a plane view of the device when the door member is kept closed; Fig. 5 is a plane view of the device when the door member is kept opened; Fig. 6 is a front elevational view showing the upper and lower portions of the device when the door member is kept closed; Fig. 7 is a plane view showing a portion of a screening plate provided in the device when the door member is kept closed; Fig. 8 is a similar view of Fig. 8 showing the screening plate when the door member is kept opened; Fig. 9 is an exploded front view showing the portion of the screening plate provided in the device; Fig. 10 is an enlarged plane view showing a support shaft having a lock groove employed in the device in accordance with the first embodiment; Fig. 11 is a similar view to Fig. 10 showing a modification of the support shaft of Fig. 10; Fig. 12 is an enlarged plane view showing a spring employed in the device in accordance with the first embodiment; Fig. 13 is a similar view to Fig. 12 showing a modification of the spring of Fig. 12; Fig. 14 is a front elevational view of the spring in Fig. 13; Fig. 15 is an enlarged cross-sectional view showing a lock pin employed in the device in accordance with the first embodiment; Figs. 16 to 18 are respectively similar views to Fig. 15 each showing a modification of the lock pin of Fig. 15; Fig. 19 is a perspective view showing a hinge pin employed in the device in accordance with the first embodiment; Figs. 20 and 21 are respectively similar views to Fig. 20 each showing a modification of the hinge pin of Fig. 20; Fig. 22 is a cross-sectional view showing the hinge pin of Fig. 21; Fig. 23 is an exploded view of a door member showing a modification of the device with respect to the first embodiment; Fig. 24 is a front elevational view of the door member of Fig. 23; Fig. 25 is a similar view to Fig. 23 showing another modification of the device with respect to the first embodiment; Fig. 26 is a cross-sectional view showing an engagement groove employed in the device of Fig. 25; Figs. 27 and 28 are respectively similar views to Fig. 23 each showing to the other modification of the device with respect to the first embodiment; Fig. 29(A) to Fig. 29(C), are schematic, cross-sectional views showing a fixing plate employed in the device of Fig. 28 for the purpose of showing processes of manufacturing the fixing plate; Fig. 30 is a plane view of the device, when the door member is kept closed, in a modification of the first embodiment; Fig. 31 is a similar view of Fig. 30 showing the device when the door member is kept opened; Fig. 32 is an enlarged view of the left part of Fig. 30; Fig. 33 is an enlarged view of the right part of Fig. 30; Fig. 34 is an enlarged view of the left part of Fig. 31; Fig. 35 is an enlarged view of the right part of Fig. 31; and Fig. 36 is an exploded perspective view of Fig. 30. Figs. 37 to 41 are related to an opening/closing device of a door member according to a second embodiment of the present invention; Fig. 37 is a perspective view showing the external appearance of a refrigerator provided with the device according to the second embodiment of the present invention; Fig. 38 is a plane view of the device, when the door member is kept closed, in accordance with the second embodiment; Fig. 39 is a similar view to Fig. 38, but showing the device when the door member is kept opened; Fig. 40 is an exploded perspective view of the device of Fig. 38; Fig. 41 is an enlarged schematic view showing the lock groove provided in the latch plate of the device of Fig. 38; Fig. 42 is a similar view to Fig. 41 showing a modification of the lock groove of Fig. 41; Figs. 43 to 45 are related to an opening/closing device of a door member according to a third embodiment of the present invention; Fig. 43 is a plane view of the device when the door member is kept closed; Fig. 44 is a plane view of the device when the door member is kept opened; and Fig. 45 is an exploded perspective view of the device; Figs. 46 to 48 are related to an opening/closing device of a door member according to a fourth embodiment of the present invention; Fig. 46 is a plane view of the device when the door member is kept closed; Fig. 47 is a plane view of the device when the door member is kept opened; and Fig. 48 is an exploded perspective view of the device; Figs. 49 to 51 are related to an opening/closing device of a door member according to a fifth embodiment of the present invention; Fig. 49 is a plane view of the device when the door member is kept closed; Fig. 50 is a plane view of the device when the door member is kept opened; and Fig. 51 is an exploded perspective view of the device of Fig. 49; Figs. 52 to 54 are related to an opening/closing device of a door member according to a sixth embodiment of the present invention; Fig. 52 is a plane view of the device when the door member is kept closed; Fig. 53 is a plane view of the device when the door member is kept closed; Fig. 54 is an exploded perspective view of the device of Fig. 52; Figs. 55 to 57 are related to an opening/closing device of a door member according to a seventh embodiment of the present invention; Fig. 55 is a plane view of the device when the door member is kept closed; Fig. 56 is a plane view of the device when the door member is kept opened; and Fig. 57 is an exploded perspective view of the device of Fig. 55; Figs. 58 to 60 are related to an opening/closing device of a door member according to a modified embodiment of the first embodiment; Fig. 58 is a plane view of the device when the door member is kept closed; Fig. 59 is a plane view of the device when the door member is kept opened; and Fig. 60 is an exploded perspective view of the device of Fig. 53; Figs. 61 to 63 are related to an opening/closing device of a door member according to another modified embodiment of the first embodiment; Fig. 61 is a plane view of the device when the door member is kept closed; Fig. 62 is a plane view of the device when the door member is kept opened; and Fig. 63 is an exploded perspective view of Fig. 61; Figs. 64 to 66 are related to an opening/closing device of a door member according to a further modified embodiment of the first embodiment; Fig. 64 is a plane view of the device when the door member is kept closed; Fig. 65 is a plane view of the device when the door member is kept opened; and Fig. 66 is an exploded perspective view of the device of Fig. 64; Figs. 67 to 69 are related to an opening/closing device of a door member according to a modified embodiment of the second embodiment; Fig. 67 is a plane view of the device when the door member is kept closed; Fig. 68 is a plane view of the device when the door member is kept opened; and Fig. 69 is an exploded perspective view of the device of Fig. 67; Figs. 70 to 72 are related to an opening/closing device of a door member according to another modified embodiment of the second embodiment; Fig. 70 is a plane view of the device when the door member is kept closed; Fig. 71 is a plane view of the device when the door member is kept opened; and Fig. 72 is an exploded perspective view of the device of Fig. 70; Figs. 73 to 75 are related to an opening/closing device of a door member according to a further modified embodiment of the second embodiment; Fig. 73 is a plane view of the device when the door member is kept closed; Fig. 74 is a plane view of the device when the door member is kept opened; and Fig. 75 is an exploded perspective view of the device of Fig. 73; Figs. 76 to 78 are related to an opening/closing device of a door member according to a modified embodiment of the third embodiment; Fig. 76 is a plane view of the device when the door member is kept closed; Fig. 77 is a plane view of the device when the door member is kept opened; Fig. 78 is an exploded perspective view of the device of Fig. 76; Figs. 79 to 81 are related to an opening/closing device of a door member according to another modified embodiment of the third embodiment; Fig. 79 is a plane view of the device when the door member is kept closed; Fig. 80 is a plane view of the device when the door member is kept opened; Fig. 81 is an exploded perspective view of the device of Fig. 79; Figs. 82 to 84 are related to an opening/closing device of a door member according to a further modified embodiment of the third embodiment; Fig. 82 is a plane view of the device when the door member is kept closed; Fig. 83 is a plane view of the device when the door member is kept opened; and Fig. 84 is an exploded perspective view of the device of Fig. 82; Figs. 85 to 87 are related to an opening/closing device of a door member according to a modified embodiment of the fourth embodiment; Fig. 85 is a plane view of the device when the door member is kept closed; Fig. 86 is a plane view of the device when the door member is kept opened; and Fig. 87 is an exploded perspective view of the device of Fig. 85; Figs. 88 to 90 are related to an opening/closing device of a door member according to another modified embodiment of the fourth embodiment; Fig. 88 is a plane view of the device when the door member is kept closed; Fig. 89 is a plane view of the device when the door member is kept opened; and Fig. 90 is an exploded perspective view of the device of Fig. 88; Figs. 91 to 93 are related to an opening/closing device of a door member according to a further modified embodiment of the fourth embodiment; Fig. 91 is a plane view of the device when the door member is kept closed; Fig. 92 is a plane view of the device when the door member is kept opened; and Fig. 93 is an exploded perspective view of the device of Fig. 91; Figs. 94 to 96 are related to an opening/closing device of a door member according to a still further modified embodiment of the fourth embodiment; Fig. 94 is a plane view of the device when the door member is kept closed; Fig. 95 is a plane view of the device when the door member is kept opened; and Fig. 96 is an exploded perspective view of the device of Fig. 94; Figs. 97 to 99 are related to an opening/closing device of a door member according to further another modified embodiment of the fourth embodiment; Fig. 97 is a plane view of the device when the door member is kept closed; Fig. 98 is a plane view of the device when the door member is kept opened; and Fig. 99 is an exploded perspective view of the device of Fig. 97; Figs. 100 to 102 are related to an opening/closing device of a door member according to a still another modified embodiment of the fourth embodiment; Fig. 100 is a plane view of the device when the door member is kept closed; Fig. 101 is a plane view of the device when the door member is kept opened; and Fig. 102 is an exploded perspective view of the device of Fig. 100; Figs. 103 to 106 are related to an opening/closing device of a door member according to a still further another modified embodiment of the fourth embodiment; Fig. 103 is a plane view of the device when the door member is kept closed; Fig. 104 is a plane view of the device when the door member is kept opened; and Fig. 105 is an exploded perspective view of the device of Fig. 103; Figs. 106 to 108 are related to an opening/closing device of a door member according to a modified embodiment of the fifth embodiment; Fig. 106 is a plane view of the device when the door member is kept closed; Fig. 107 is a plane view of the device when the door member is kept opened; and Fig. 108 is an exploded perspective view of the device of Fig. 106; Figs. 109 to 111 are related to an opening/closing device of a door member according to a modified embodiment of the sixth embodiment; Fig. 109 is a plane view of the device when the door member is kept closed; Fig. 110 is a plane view of the device when the door member is kept opened; and Fig. 111 is an exploded perspective view of the device of Fig. 109; Figs. 112 to 114 are related to an opening/closing device of a door member according to a modification of the seventh embodiment; Fig. 112 is a plane view of the device when the door member is kept closed; Fig. 113 is a plane view of the device when the door member is kept opened; and Fig. 114 is an exploded perspective view of the device of Fig. 112; Figs. 115 to 118 are related to an opening/closing device of a door member according to a modified embodiment of the first embodiment; Fig. 115 is a plane view of the device when the door member is kept closed; Fig. 116 is a plane view of the device when the door member is kept opened; Fig. 117 is a front elevational view of the device; and Fig. 118 is an exploded perspective view of the device of Fig. 115; Fig. 119 is a cross sectional view of a conventional opening/closing device of a door member; and Fig. 120 is a perspective view of a different conventional opening/closing device of a door member. Before the description of the present invention proceeds, it is to be noted that like parts are designated by like reference numerals throughout the accompanying drawings. 1) First Embodiment Figs. 1-9 show an opening/closing device of a door member of a refrigerator according to the first embodiment of the present invention. Fig. 1 is a perspective view of an outer appearance of a refrigerator which is provided with the opening/closing device of Fig. 1. The opening/closing device according to the first embodiment has a pair of right and left hinge pins 2A and 2B protruding at the right and left opposite portions of a door member 1, a fixed plate 4 provided in a main body 3 in a manner to confront to the upper and lower portions of the door member 1, a pair of right and left latch plates 5A and 5B rotatably provided at the right and left sides of the fixed plate 4, and a coupling means 6 installed between the pair of the latch plates 5A and 5B. The hinge pins 2A, 2B are projected from hingeplates 102A, 102B (see Fig. 6), which are disposed in four upper, lower locations of both the left, right portions of the main body 3 (equivalent to the cabinet in a refrigerator or the like) with a door 1 being mounted thereon, a rectangular fixing plate 4B (see Fig. 6) disposed oppositely on the upper, lower portions of the door 1, a pair of left, right latch plates 5A, 5B disposed in the right, left positions of the fixing plate 4B, a coupling member 6 disposed between a pair of latch plates 5A and 5B. Furthermore, among the fixing plate 4B and the latch plates 5A, 5B, there are disposed springs 10A, 10B which are adapted to effect the urging operation so as to retain both the positions, where the latch plates 5A, 5B restrain the hinge pins 2A, 2B and the position, where they release the restraint thereof. In the four locations in total of the respective left, right positions of the upper, lower portions of the door 1, there are provided notch portions 101A, 101B (only the upper side are shown in Fig. 4 and Fig. 5) which the hinge pins 2A, 2B are engaged with and disengaged from during the opening, shutting operations. The notch portions 101A, 101B are formed from the top face to the inner side face in the upper portion of the door 1, and are formed from the lower side to the inner side face in lower portion thereof. The fixing plate 4B has stage portions 103A, 103B disposed on the both the left, right portions, with engagement grooves 7A, 7B being formed respectively on the stage portions 103A, 103B. These engagement grooves 7A, 7B are open towards the side of the main body 3, with the inserting operation being effected for engagement from the opening side with respect to the hinge pins 2A, 2B on the corresponding side. On one of the fixing plates 4B to be placed on the top portion of the door 1, there are oscillably mounted approximately triangle shaped screening plates 106A, 106B respectively on the top faces of the stage portions 103A, 103B. Concretely the engagement pins 108A, 108B downwardly projected respectively from the respective one corners of the screening plates 106A, 106B are engaged into the circular through holes 105A, 105B, which are respectively drilled between the opening sides of the engagement grooves 7A, 7B and the stage walls 104A, 104B in the top faces of the stage portions 103A, 103B. And springs 107A, 107B are wound around the engagement pins 108A, 108B, with each one end of the springs 107A, 107B being inserted into receiving concaves 109A, 109B respectively projected from the screening plates 106A, 106B, and the other ends being disposed against the stage walls 104A, 104B of the fixing plate 4B, so that both the ends are compressed so as to be spread. Namely, the springs 107A, 107B urge in one oscillating direction the screening plates 106A, 106B by the extending force thereof so as to block the engagement grooves 7A, 7B and the notch portions 101A, 101B of the door 1. The latch plates 5A, 5B have latch grooves 8A, 8B opened onto the outer diameter side of the circular portion so that the hinge pins 2A, 2B may be engaged with and be disengaged from, are rotatably pivoted on the fixing plates 4A, 4B with the shafts 9A, 9B in the inner side positions of the engagement grooves 7A, 7B. And as shown in Fig. 4, the latch grooves 8A, 8B intersect the engagement grooves 7A, 7B so as to restrain the hinge pins 2A, 2B within the intersection portions in the left, right outwardly directed angular positions. When they are rotated in the restraint releasing direction, for instance, (clockwise direction with respect to the latch plate 5B on the left-hand side in the drawing, or counter-clockwise direction with respect to the latch plate 5A on the right-hand side, by a constant angle form the angular position, the openings of the latch grooves 8A, 8B conform with the openings of the engagement grooves 7A, 7B so as to allow the hinge pins 2A, 2B to be disengaged from the engagement grooves 7A, 7B. Each one end of the springs 10A, 10B are rotatably pivoted on the mounting pins 11A, 11B projected from the end portions which are located on the opposite sides to the latch grooves 8A, 8B of the latch plates 5A, 5B, while the other ends thereof are rotatably pivoted on the mounting pins 12A, 12B projected from the fixing plate 4A. The mounting pins 12A, 12B are provided in positions which become almost the central portion of the angular range produced by the mounting pins 11A, 11B and the support shafts 9A, 9B of the latch plates 5A, 5B when the latch plates 5A, 5B are rotated between positions for restraining the hinge pins 2A, 2B and the positions for releasing the restraint thereof. The springs 10A, 10B apply their forces in the directions along which both the ends thereof are always tried to be spread, so that they have a function of bringing the door 1 into close adherence with the main body 3 during the closure of the door 1. The coupling member 6 prevents the rotation of the other latch plate 5A or 5B during the rotation of one latch plate 5B or 5A in the restraint releasing direction. The coupling member is composed of a pair of I-shaped oscillating links 6A, 6B and a coupling link 6C which is adapted to combine the respective one-end portions of these oscillation links 6A, 6B. The oscillation links 6A, 6B are oscillably pivoted at the other end portions on the shafts 13A, 13B projected from the fixing plates 4A, 4B. Also, the oscillation links 6A, 6B have approximately L-shaped lock grooves 14A, 14B formed therein. The lock grooves 14A, 14B are composed of slide guide portions 14A₁, 14B₁ each extending in the direction away from the support shafts 13A, 13B of the oscillation links 6A, 6B, and stopper portions 14A₂, 14B₂ each disposed along the circular arc with the support shafts 13A, 13B as the centers. Lock pins 15A, 15B projected from the latch plates 5A, 5B are engaged into the lock grooves 14A, 14B. As shown in Fig. 6, screening plates 106A, 106B are not mounted on the opening, shutting apparatus of the door to be provided in the lower portion of the door 1, with the door opening, shutting apparatus to be provided on the door top portion being mounted overturned so that the fixing plate 4B may be located lower. In this case, hinge plates 102A, 102B may be made flush with bottom face of the door 1 with the stage portions 103A, 103B of the fixing plate 48 for better appearance, so that the degree of freedom of the design may be increased. Here, the screening plates 106A, 106B are assumed not to be provided on the notch portions 101A, 101B on the side of the lower portion of the door 1, but, needless to say, the screening plates 106A, 106B may be provided on the side of the lower portion of the door 1. The opening, closing operations of the door 1 of such construction as described hereinabove will be described hereinafter. The plane of the opening, closing apparatus to be disposed on the top portion of the door 1 will be described with reference to Fig. 4 and Fig. 5. As shown in Fig. 4 in a condition where the openings of the latch grooves 8A, 8B of the respective latch plates 5A, 5B are externally directed to the left, to the right, the latch grooves 8A, 8B are cross to the engagement grooves 7A, 7B, with hinge pins 2A, 2B being restrained within the intersection portions so that the condition is maintained with the spreading forces of the springs 10A, 10B, thus resulting in the closed condition of the door 1. As the hinge pins 2A, 2B are respectively positioned in the recesses of the engagement grooves 7A, 7B under this condition, the screening plates 106A, 106B compresses the springs 107A, 107B, as shown in Fig. 7, by the hinge pins 2A, 2B and are driven into clockwise and counter-clockwise rotated positions so as to open the notch portions 101A, 101B of the door 1. In this condition, as the notch portions 101A, 101B of the door 1 are covered by the hinge plates 102A, 102B, foreign materials such as dust, etc. are prevented from being intruded from the notch positions 101A, 101B. In order to open the door 1 from the left, pull the concave portion, which is not shown here, but see reference numeral 16 in Fig. 2, for opening, closing operation use on the left side of the door 1. As it is pulled in a direction along which it goes through the engagement groove 7B from the immovable left-hand hinge pin 2B, clock-wise rotating force, i.e., the restraint releasing direction rotating force are applied upon the left-hand side latch plate 5B. At this time, the lock pin 15B disposed on the latch plate 5B is located on the angle portion of the lock groove 14B. The latch plate 5B further rotates clockwise, with the lock pin 15B continuously sliding along the slide guide portion 14B1. When the latch plate 5B passes the half portion of the rotation angle thereof, the spring 10B tries to be spread. The latch plate 5B is forcibly rotated clockwise by the urging force thereof, the opening of the latch groove 8B confirms to the opening of the engagement groove 7B, so that it is possible for the left-hand side hinge pin 2B to be pulled through. The lock pin 15B of the latch plate 5B slides through the slide guide portion 14B1, so that the right-hand side oscillating link 6A is oscillated clockwise through the coupling link 6C, and the lock pin 15A comes into contact against the end portion of the stopper portion 14A2 of the lock groove 14A1. The right-hand side latch plate 5A cannot move in any direction, with the restraining condition of the right-hand side hinge pin 2A being retained. Accordingly, the door 1 is opened (see Fig. 5) from the left-hand side with the right-hand side hinge pin 2A as a rotation center. In this condition, as the spreading force of the spring 10B is urged on the left-hand latch plate 5B, the latch plate 5B is retained under the condition as it is. Simultaneously with the disengagement of the engagement groove 7B from the hinge pin 2B, the screening plate 106B is moved by the spreading force of the spring 107A until the engagement pin 108B, which is a support shaft thereof, is completely rotated clockwise as the rotation center so as to completely choke the notch portion 101B of the door 1 (see Fig. 8). Even in the open condition of the door 1, the foreign materials may be prevented from being intruded from the notch portion 101B. The above-described operation is continuously effected. In order to shut the opened door 1 in such a manner as described hereinabove, the left-had side portion of the door 1 is necessary only to be depressed onto the side of the main body 3. The engagement groove 7B and the latch groove 8B are engaged into the hinge pin 2B, so that the latch plate 5B starts its counter-clockwise rotation, contracting the spring 10B by the depressing force of the latch plate 5B with respect to the hinge pin 2B. The lock pin 15B of the latch plate 5B, which is located in the end portion of the slide guide portion 14B1 of the lock groove 14B of the left-hand side oscillating link 6B is moved towards the angle portion of the slide guide portion 14B1 by the rotation force of the latch plate 5B. As the spring 10B tries to be spread when the latch plate 5B passes the half portion of the rotation angle, the latch plate 5B is forcible rotated counter-clockwise by the urging force until the latch 8B crosses the engagement groove 7B so as to restrain the hinge pin 2B in the recesses of the engagement groove 7B. Accordingly, the door 1 is closed, so that the condition is restored to that of Fig. 5. When the engagement groove 7B is engaged with the hinge pin 2B, the screening plate 106B comes into contact against the hinge pin 2B, and the screening plate 106B is driven onto the side of the stage wall 104B of the fixing plate 4B against the elasticity of the spring 107B through the movement onto the recess side of the engagement groove 7B of the hinge pin 2B, so that the engagement groove 7B and the notch portion 101B of the door 1 are opened (see Fig. 2). Even in this condition, the hinges 102B, 102A prevent the foreign materials from being intruded from the notch portions 101B, 101A as described hereinabove. As a case where the door 1 is opened and, shut from the right-hand side is realized by the operation opposite in left, right to the above-described case, the operation description will be omitted. In the above-described embodiment, the hinge pins 2A, 2B are disposed on the main body and the fixing plates 4A, 4B are disposed on the door 1. The embodiment opposite to the above-described embodiment is included in the present embodiment. As the embodiment may be readily realized from the above-described embodiment, the concrete description will be omitted. Besides, if the door 1 is pulled in the opening direction simultaneously at the right and left sides, both the oscillating force in the counter-clockwise direction and that in the clockwise direction act on the links 6A and 6B through the hinge pins 2A and 2B, latch plates 5A and 5B, lock pins 15A and 15B and lock grooves 14A and 14B, and accordingly the coupling means 6 is not oscillated in any direction since the links 6A and 6B of the coupling means 6 are coupled by the coupling link 6C. Therefore, the latch plates 5A and 5B are prohibited from rotating, and the hinge pins 2A and 2B become unable to slip off from the engaging grooves 7A and 7B, so that the door 1 is kept in the closed condition. When the door 1 is desired to be removed, after the door member 1 opened at the right or the left side, the latch plate 5A or 5B at the side the door 1 is opened is rotated by a stick means such as a screwdriver etc. in the direction reverse to the restriction-releasing direction. By the rotation of the latch plate 5A or 5B at the opening side in the above-described direction, the other latch plate 5B of 5A is released from the rotation-restricted condition, so that the other hinge pin 2B or 2A becomes able to slip off from the engaging groove 7B or 7A. Meanwhile, unless the latch plates 5A and 5B are completely restricted, in other words, the coupling means 6 is at the neutral position when the door 1 is closed, the lock pins 15A and 15B cannot move smoothly from the stopper portions 14A2 and 14B2 to slide guide portions 14A1 and 14B1 of the lock grooves 14A and 14B, respectively. Therefore, it may be feared in the above-described case that the opening/closing direction of the door 1 be difficult to be switched to the right or left. However, according to the present embodiment, the latch plates 5A and 5B are arranged to be so urged by the springs 10A and 10B as to be maintained in the restricted position, and accordingly the coupling means 6 is kept at the neutral position at all times, so that the door 1 can be smoothly switched to be opened/closed at the right from the left, or vice versa. In the state where the door 1 is opened at one side, if the latch plate 5A or 5B at the opening side is rotated by accident in the restraining direction because of the reaction, etc. brought about when the door member is opened/closed, the other latch plate 5B or 5A is released from the rotation-restricting condition, and it would be feared that the door 1 be unexpectedly removed from the main body of the refrigerator. In actual, however, since the latch plates 5A and 5B are so urged by the springs 10A and 10B so as to be kept in the restriction-releasing position, thereby preventing the door 1 from being taken off from the main body. According to the present embodiment, although the links 6A and 6B are pivotally fixed to the rear side of the fixed plates 4A,4B and the coupling link 6c is provided at the front side of the fixed plates 4A,4B, the reverse may be possible, that is, the links 6A and 6B are pivotally provided at the front side of the fixed plates 4A,4B and the coupling link 6c is provided at the rear side of the fixed plates 4A,4B. In the above-described latter case, the slide guide portions 14A1 and 14B1 of the lock grooves 14A and 14B are extended in such form as to come close from the end portions of the stopper portions 14A2 and 14B2 to the pivotal shafts 13A and 13B, respectively. The position or the side of the coupling link 6c may be suitably decided, with consideration taken into the design of the door 1, in such case that the handle 16 is provided at the front side of the upper face of the door member 1, etc., or the structure where the coupling link 6C is installed, etc., so that the coupling link 6c be not an obstacle. Such modification as referred to above will be shown in Figs. 58 to 60 as a modified embodiment. Since the embodiment is a modified example of the earlier-described first embodiment, the corresponding parts of the embodiments are designated by the same reference numerals as in the first embodiment. Fig. 58 is a plane view of a double-openable device of a door member according to the embodiment of the present invention when the door is kept closed. Fig. 59 is a plane view when the door member is kept opened. Fig. 60 is an exploded perspective view. It is to be noted here that the springs 10A,10B are omitted in the drawings. Also, in this modified embodiment, a pair of hinge pins 2A and 2B are provided at the side of door 1, and the fixed plate 4B at the side of the main body 3. Another modified embodiment of the first embodiment is shown in Figs. 61 to 63 in which the corresponding parts are designated by the same reference numerals as in the first embodiment. Fig. 61 is a plane view of a double-openable device according to the embodiment when the door member is kept closed. Fig. 62 is a plane view when the door member is kept opened. Fig. 63 is an exploded perspective view: In the drawings Figs. 61-63, the springs 10A,10B are omitted. A further modification of the first embodiment is illustrated as an embodiment in Figs. 64 to 66. In the embodiment which is a modified example of the first embodiment, the corresponding parts are designated by the same reference numerals as in the first embodiment. Fig. 64 is a plane view when the door member is closed. Fig. 65 is a plane view when the door member is opened. Fig. 66 is an exploded perspective view. The springs 10A,10B are omitted in Fig. 64 to 66. Since the operation of the above construction is the same to that of the first embodiment, the practical explanation thereof is omitted for the sake of brevity. In the above-embodiment, the screening plates 106A, 106B are mounted on the fixing plate 4B. In the present embodiment, the screening plates 106A, 106B may be mounted on the inner face of the door 1. Also, in the above-described embodiment, the whole thickness is improved not to become thicker if the stage portions 103A, 103B are provided on both the right, left ends of the fixing plate 4B, with the screening plates 106A, 106B being provided. The present embodiment includes the screening plates 106A, 106B mounted on the flat fixing plate 4B. The present embodiment applies not only to the opening, shutting apparatus of the door shown in the above-described embodiment, but also even to the construction in which the springs 10A, 10B are not used. In addition, although the notch portions 101A, 101B of the door 1 are adapted to open, choke through the oscillation in cooperation with the opening, shutting operation of the door 1, it is variably considered that the notch portions 101A, 101B of the door 1 may be opened, choked by the advance or retreat movement of the screening plates 106A, 106B in paralleled to the relative moving direction between the hinge pins 2A, 2B and the engagement grooves 7A, 7B through the opening, shutting operation of the door 1. Fig. 10 is an enlarged view of a lock groove 14B of the link 6B on the left side in the above-described embodiment. As described hereinabove, in the respective links 6A, 6B the respective lock grooves 14A, 14B are formed into almost "L" shape, with the bending being almost rectangular between the slide guide portions 14A1, 14B1 of the lock grooves 14A, 14B and the stopper portions 14A2, 14B2. As described hereinabove, in order to smoothly open the door 1 from any right or left direction, the lock pins 15A, 15B of the latch plates 5A, 5B are required to be located in the bent angle portions of the lock grooves 14A, 14B. However, when the assembling accuracy of the door 1 or the main body 3 is worse, the position relation may be twisted in the upper, lower relation of the door 1. In the upper position or the lower position of the door 1, the lock pin 15A is not located in the bent angle portion of the lock groove 14A as shown in the imaginary line of Fig. 10, is located in the so-called semi-open condition, wherein the lock pin 15A comes into contact against the side wall of the slide guide portion 14A1 even if the door is tried to be opened from the opposite side to prevent the smooth movement into the stopper portion 14A2 so that the door 1 may not be smoothly opened. As shown in Fig. 11, in the modified embodiment of the first embodiment, the inner side portion 14A3 of the bent portion between the slide guide portion 14A1 of the lock groove 14A of the link 6A and the stopper portion 14A2 may be formed into a curve line. In this manner, if the lock pin 15A is not positioned in the bent angle portion of the lock groove 14A, i.e., the door is semi-open as shown in the imaginary line of Fig. 11, the door 1 may be smoothly opened, because the lock pin 15A is guided onto the curved portion 14A3 and is smoothly moved onto the stopper portion 14A2 when the door is tried to be opened from the opposite side. It is to be noted in Fig. 11 that the same thing can be said about the link 6B on the left side through only the link 6A on the right side is shown. Fig. 12 shows the mounting portion onto the fixing plate 4A of the spring 10B on the right side in the first embodiment or the latch plate 5B, with the same thing being described, also, about the spring 10A on the left side. In the embodiment, the circular portion is to be engaged into the mounting pins 11A, 11B, 12A, 12B of the fixing plate or the latch plates 5A, 5B with the end portions of the springs 10A, 10B being bent circular. Although the E ring 10 is considered to be engaged into the end portions of the mounting pins 11A, 11B, 12A, 12B with the springs 10A, 10B being engaged therewith so that the springs 10A, 10B mounted in this manner may not be easily disengaged from the mounting pins 11A, 11B, 12A, 12B, the E ring may be disengaged while the door opening, shutting operations are repeated, because the E ring is not too strong with respect to the load in the thrust direction. It is considered that the springs 10A, 10B are inserted into the mounting holes of the fixing plate 4A or the latch plates 5A, 5B and are caulked from the reverse face after the springs 10A, 10B have been engaged with the gib-heated mounting pins with the mounting pins 11A, 11B, 12A, 12B being the gib-heated pins. The springs 10A, 10B rotate in the mounting portion for each rotation of the latch plates 5A, 5B in the opening, shutting operations of the door 1. Also, the spreading force is always applied upon the springs 10A, 10B. Furthermore, the circular springs 10A, 10B and the mounting pins 11A, 11B, 12A, 12B are in point contact against one another, as they are likely to wear out because of the concentration load, so that the mounting portions of the springs 10A, 10B are likely to break. As shown in the plan view of Fig. 13 and the front face view of Fig. 14, in another modified embodiment of the first embodiment, the end portions of the springs 10A, 10B may be wound on the Bushings 110 and mounted on the mounting pins 11A, 11B, 12A, 12B. The outer diameter of the cylindrical Bushings 110 may be selected somewhat larger than the circular inner diameter of the end portions of the springs 10A, 10B so that the springs 10A, 10B tighten the Bushings 110 to secure the springs 10A, 10B. In this manner, the contact area against the mounting pins 11A, 11B, 12A, 12B becomes larger enough to prevent the abrasion and also, the springs 10A, 10B themselves do not wear out so that the springs 10A, 10B are not broken. Also, the number of the windings onto the bushings 110 of the springs 10A, 10B may be made two times or more so that the springs 10A, 10B may be mounted more stably. In this example, the mounting pins 11A, 11B, 12A, 12B are to be gib-headed pins. It is to be noted that in Fig. 13 and Fig. 14, only the spring 10A on the right side is shown, with the spring 10B on the left side being the same. Fig. 15 is an enlarged sectional view of the mounting portion of the lock pins 15A, 15B in the first embodiment. In this Fig. 15, 111 is a retaining ring for come-off prevention use, 112 is a washer. During the opening, shutting operation of the door, the lock pins 15A, 15B slide in the lock grooves 14A, 14B of the links 6A, 6B, so that the lock pins 15A, 15B may break due to the abrasion thereof. As shown in Fig. 16, in the modified example of the first embodiment, a rotatable cylindrical sleeve 113 may be loosely engaged with the lock pins 15A, 15B. During the opening, shutting operation of the door, the sleeve 113 rotates to prevent the lock pins 15A, 15B from being worn out. It is to be noted that as shown in Fig. 38, the lock pins 15A, 15B may be used as gib-headed mounting pins, screws may be used as shown in Fig. 18. In this case, the retaining ring 111 and the washer 112 may be omitted. In the first embodiment, hinge pins 2A, 2B are provided on the side of the main body 3, a fixing plate 4, etc. are provided on the side of the door 1. The hinge pins 2A, 2B are normally secured through the pressure insertion or the like into the hinge plates 102A, 102B fixed on the main body 3 in such a shape that a round rod member is cut at a right angle in the axial direction thereof by the given length. Accordingly, as shown in Fig. 1, when the door has been opened, the cut face of the hinge pins 2A, 2B are exposed. It is dangerous when the user collides with the hinge pins 2A, 2B by mistake. In the modified example of the embodiment, as shown in Fig. 19, the tip end portion of the hinge pins 2A, 2B may be formed semi-spherical. Or as shown in Fig. 20, the hinge pin may be somewhat bent on the side of the main body 3. In other words, it may be constructed as shown in Figs. 21 and 22. Conventionally the hinge pins 2B support only the one end thereof on the hinge plates, but in the embodiment, in order to improve the strength of the hinge portion, the shape of the hinge plate 2A is formed into a ]-shape so as to support the strength of the hinge 4A portion. The hinge plates 102A,103B are manufactured by the. steel-plate bending, die casting or the like. In this manner, the hinge plate 102B is shaped to support both the upper, lower end portions of the hinge pins 2A to improve the strength of the hinge portion as compared with the conventional example for reduction of the displacement of the hinge portion caused by the door load, thus making it possible to open or close the door smoothly. In the present embodiment, both the end portions of the hinge pin 2A are supported by the hinge plate 102B so as not to expose the cut face, thus preventing the fact to improve the safety. The embodiment shown in Fig. 23, which is a dismantled perspective view of a door, and Fig. 35, which is a plan view of the door is a modified example of the first embodiment, wherein the same reference characters are given to the elements corresponding to those of the first embodiment. Although the right, left hinge pins 2A, 2B are mounted respectively on the side of the main body 3, as shown in the embodiment, with the individual hinge plates 102A, 102B, it is extremely bothersome to have the interval between the hinge pins 2A, 2B within the given size tolerance (for example, ± 0.2 mm) in a construction, wherein the hinge pin is individually mounted right, left as described hereinabove. In the embodiment, a hinge plate 114 with right, left hinge pins 2A, 2B mounted thereon is composed into one piece member through the sheet metal processing, or the like. The hinge plate 114 with right, left hinge pins 2A, 2B being mounted in this manner is composed into one piece member so that as shown in Fig. 24, it is possible to easily set at the given size the interval ℓ between the hinge pins 2A and 2B. As the other construction and the operation are the same as those of the first embodiment, the description will be omitted. Fig. 25 is a perspective dismantled view of a door showing a modified example of the first embodiment, wherein the same reference characters are given to elements corresponding to those of the first embodiment. Normally, the hinge pins 2A, 2B and the fixing plate 4B are metallic. During the opening, closing of the door 1, the hinge pins 2A, 2B collide against the recesses of the engagement grooves 7A, 7B of the fixing plate to cause the noises at this time. In order to reduce the noises caused by the collision, it is considered that both the hinge pins 2A, 2B and the fixing plate are made of resin. However, the strength may be insufficient to support the door load when the hinge pins 2A, 2B are made of resin. Also, when the fixing plate 4B is made of resin, it is hard to have the size accuracy because of the contraction during the molding operation, thus resulting in pitch disarrangement between the right, left hinge pins 2A, 2B and the disengagement grooves 7A, 7B, so that the door 1 may not be opened or shut smoothly. Thus, in the embodiment, the hinge pins 2A, 2B and the fixing plate 4B are made of metal, with resin-made buffer members 115A,115B being additionally provided as shown in Fig. 26, on the portion of the engagement grooves 7A, 7B of the fixing plate 4. It is desired to use as a buffer member 115 the resin superior in abrasion resisting property such as polyamide resin, polyacetal resin or the like. Also, the buffer member 115 molded specially may be engaged into the engagement grooves 7A, 7B of the fixing plate 4B or resin may be outserted into the engagement grooves 7A, 7B of the fixing plate 4B for a forming operation. In this manner, the hinge pins 2A, 2B and the fixing plate 4B are made of metal, the buffer members 115A,115B are provided into the engagement grooves 7A, 7B of the fixing plate 4B so that the noises may be reduced during the opening shutting operations of the door without the expense of the strength and the size accuracy. As the other construction and the operation is the same as those of the first embodiment, the description will be omitted. Fig. 27 is a perspective dismantled view of a door showing another modified example of the first embodiment, wherein the same reference characters are given to the elements corresponding to those of the first embodiment. When the hinge pins 2A, 2B and the latch plates 5A, 5B are made of metal, the hinge pins 2A, 2B collide against the latch grooves 8A, 8B of the latch plates 5A, 5B during the opening, closing operations of the door 1 so as to cause the noises at this time. Also, the hinge pins 2A, 2B and the latch plates 5A, 5B wear out to cause the metallic powder. In order to reduce the noises caused by the collision and to prevent the latch plates 5A, 5B from wearing out, in the eleventh embodiment, the hinge pins 2A, 2B are made of metal and the latch grooves 8A, 8B portions of the latch plates 5A, 5B are made of resin. Namely, in the embodiment, the projected portions of the lock pins 15A, 15B further the pivotal portions of the springs 10A, 10B from the rotary shafts 9A, 9B of the latch plates 5A, 5B are made of metallic plate, with the latch grooves 8A, 8B from the rotary shaft portions 9A, 9B being made of resin 116A,116B. In this embodiment, the forming operation is effected by the so-called insertion molding of inserting the metallic plate into the resin 116A,116B. In this manner, the strength of the projection portions of the lock pins 15A, 15B may be retained, and also the pivotal portions of the springs 10A, 10B may be prevented from being deflected by the force of the springs 10A, 10B for the position urging application of the latch plates 5A, 5B. The resin superior in strength and abrasion resisting property such as polyacetal resin or the like is desirable as the resin 116A,116B to be used in the latch grooves 8A, 8B. When the portions of the latch grooves 8A, 8B are made of resin in this manner, it is possible to reduce the noises in the opening, closing operation of the door and furthermore, the metallic powder is not caused through the abrasion of the hinge pins 2A, 2B and the latch plate 5A, 5B. When the excessive strength is not required in the projected portions of the lock pins 15A, 15B and the pivotal portions of the springs 10A, 10B, the whole latch plates 5A, 5B may be resin-made. As the other construction and the operation is the same as those of the first embodiment, the description thereof will be abbreviated. Fig. 28 is a perspective dismantled view of a door showing a further modified example of the first embodiment, wherein the same reference characters are given to the elements those of the first embodiment. In order to engage the hinge pins 2A, 2B by the engagement grooves 7A, 7B of the fixing plate 4B and the latch grooves 8A, 8B of the latch plates 5A, 5B as described hereinabove in the opening, closing apparatus of the door of the present invention, the force of stretching the engagement grooves 7A, 7B is applied upon the engagement grooves 7A, 7A of the fixing plate 4B opposite on the side to the opening by the self-weight, etc. of the door 1 with the door being opening. Also, in order to prevent the door 1 from hitting the main body 3 when the door 1 is opened, the positions of the right, left hinge pins 2A, 2B are required to be located near both the right, left end portions as much as possible, with the size between the respective engagement grooves 7A, 7B of the fixing plate 4B and the right, left end portions becoming smaller, thus resulting in concentrated stress upon the portion. When the large load is applied upon the door 1, the engagement grooves 7A, 7B are deformed to widen the grooves, so that the hinge pins 2A, 2B may be disengaged from the latch grooves 8A, 8B of the latch plates 5A, 5B or the opening, shutting operation of the door 1 may not smoothly effected. In the embodiment, the peripheral portion of the engagement grooves 7A, 7B of the fixing plate 4B and right, left outer peripheral portions of the fixing plate 4B are bent. This bent portion 117A,117B improves the strength through the larger sectional factors, preventing the engagement grooves 7A, 7B of the fixing plate 4B and the end portion of the fixing plate 4B from being easily deformed even if the load is applied upon the door 1 during the opening operation of the door 1. The bent portion 117A,117B of the fixing plate 4B is formed as follows. Namely, as shown in Fig. 29, the portion corresponding to the outer peripheral portion of the peripheral portion of the engagement grooves 7A, 7B and the outer peripheral portion of the fixing plate 4B are once press-molded into the stairs shape and thereafter, the groove portion and the outer edge portion are struck so as to form the bent portion 117A,117B, which is accurate in size, without the deformation of the groove portion. As the other construction and operation is the same as those of the first embodiment, the description will be omitted. Fig. 30 is a plane view of the opening/closing device for use in a refrigerator when the door is kept closed as still another example of the first embodiment. Fig. 31 is a plan view of the device when the door is kept open. Figs. 32 to 35 are enlarged views of the essential portion of the device shown in Figs. 30 and 31; specifically, Fig. 32 being an enlarged view of the left part of Fig. 30, Fig. 33 being an enlarged view of the right part of Fig. 30, Fig. 34 being an enlarged view of the left part of Fig. 31, and Fig. 35 being an enlarged view of the right part of Fig. 31. Fig. 36 is an exploded perspective view of Fig. 30. The links 6A and 6B are pivotally coupled to the coupling link 6C not at the end portions thereof, but in the middle or intermediate portions and moreover at the end portions close to the respective opposite links. Moreover, the slide guide portions of the lock grooves 14A and 14B are not straight but curved to be convex in the central direction of the fixed plate 4. In order to avoid an erroneous operation of the latch plates 5A and 5B when the door is opened, safety plates 29A and 29B are added. Further, why the links 6A and 6B are pivotally fixed to he coupling link 6C not at the ends thereof, but in the middle of the links and at the end portions near to the opposite links is because of the structural restriction when the fixed plate is mounted in the door Since the slide guide portions of the lock grooves 14A and 14B are curved so as to make small the crossing angles of the slide guide portions and the stopper potions, the possibilities that the door 1 be loosened to come frontwards, that is, the loose-state of the door caused by the play between the lock grooves and the lock pins can be reduced, when the door is pulled simultaneously from the right and left sides thereof to be opened. According to the above-described embodiment, if the latch plate 5A or 5B at the opening side of the door is rotated in the direction reverse to the restriction-releasing direction, the door 1 can be removed. However, if the operation is miscellaneously effected, namely, without the intention to remove the door, or if a child goes into mischief, the door may be undesirably dropped off. Therefore, in the case where the door is actually desired to be opened, the safety means should be actuated before the latch plate 5A or 5B is rotated. Unless the safety means is operated, the door cannot be removed. Each of the two safety means provided in the vicinity of the latch plate 5A or 5B at the opposite side of the opening side is comprised of a safety plate 29A or 29B projecting to the side of the main body 3 from the door, and a spring 31a or 31B for urging the safety plate to be projected to the side of the main body, so that the movement of the coupling means between the latch plates may be controlled by a safety groove 32A (32A1, 32A2) or 32B (32B1 and 32B2) formed in a crooked shape in the safety plate and, a safety pin 33A or 33B of the link 6A or 6B. A still another modified embodiment of the present invention which is a modified example of the foregoing embodiment is shown in Figs. 115 to 118, wherein the corresponding parts are designated by the same reference numerals as in the first embodiment. Fig. 115 is a plane view of the device when the door is kept closed. Fig. 116 is a plane view of the device when the door is kept opened. Fig. 117 is a front elevational view of the device, and Fig. 118 is an exploded perspective view of the device according to the embodiment. According to the embodiment, the safety plates 29A and 29B are rotatably and pivotally fixed to the fixed plate 4 in the vicinity of the respective latch plates and, urged by the corresponding springs 31A and 31B so as to be projected towards the main body. The safety grooves 32A and 32B are comprised of stopper portions 32A2 and 32B2 centering the pivotal shafts 30A and 30B of the safety plates and slide guide portions 32A1 and 32B1 extending to the right and left sides of the safety plates from the ends of the stopper portions, respectively. Each of the safety pins 33A and 33B is projected in the link 6A or 6B corresponding to the respective safety groove, which serve also as a pivotal shaft of the link 6A or 6B, and the coupling link 6C. However, the pivotal shafts may be separately provided. When the door 1 is kept closed, the safety pins 33A and 33B are in the slide guide portions 32A1 and 32B1. By opening the door 1, the latch plate 5A or 5B at the opening side is rotated and the safety pin 33A or 33B is slided in the slide guide portion. The safety pin 33B or 33A in the link opposite to the opening side which is coupled by the coupling link 6C is brought to the bent-corner of the safety groove, and accordingly the safety plate 29B or 29A is rotated by the springs 10A,10B to be projected to the side of the main body. At the same time, the safety pin 33B or 33A is fitted into the stopper portion 32B2 or 32A2, thus restricting the coupling means 6 from being oscillated. Accordingly, the latch plate at the opening side of the door 1 while the door 1 is kept opened cannot be rotated. When the door 1 is being closed, a touch portion 29A1 or 29B1 of the safety plates 29A or 29B strikes the main body 3 which is then pressed back into the door 1. Consequently, the safety pin 33B or 33A is returned back to the bent corner of the safety groove. Accordingly, the coupling link 6C becomes oscillatable again, and the latch plate 5A or 5B is rotated to meet the hinge pin. Since it is necessary only to release the restriction of the safety pin 33A or 33B inside the bent corner between the stopper portion and the slide guide portion slightly before the door is completely closed, it is more preferable to form some notch or clearance in the safety grooves. Since the safety means is actuated in the vicinity of the latch plate at the side opposite to the opening side, and separated from each other, the safety means may be touched simultaneously with considerably reduced possibilities, thereby to eliminate the danger that the door is inadvertently removed. In addition, when the door is kept opened, the right and left plates are always fixedly secured. Therefore, the latch plates can be prevented from being unexpectedly rotated by the vibrations when the door is opened/closed, or by some other reasons, so that the door can be opened/closed positively. 2) Second Embodiment Figs. 37 to 42 show an opening/closing device of a door of a refrigerator according to the second embodiment of the present invention. Fig. 37 is a perspective view of an outer appearance of a refrigerator which is provided with the opening/closing device. Fig. 38 is a plane view showing the state when the door is kept closed, Fig. 39 is a plane view showing the state when the door is kept opened, and Fig. 40 is an exploded perspective view of Fig. 38. As seen from these Figs. 37 to 42, the opening/closing device according to the second embodiment has a pair of right and left hinge pins 2A and 2B protruding at the right and left opposite portions of a door 1, a fixed plate 4B provided in a main body 3 (shown in Fig. 1) in a manner to confront to the upper and lower portions of the door 1, a pair of right and left latch plates 5A and 5B rotatably provided at the right and left sides of the fixed plate 4, and a coupling means 6 installed between the pair of the latch plates 5A and 5B. At the outside of the door 3, there is provided with a handle 16 for the operation of opening or closing the door. Since the second embodiment is a modified example of the first embodiment, parts of the second embodiment corresponding to those of the first embodiment are designated by the same reference numerals. The difference of the present second embodiment from the first embodiment is that the lock grooves 14A and 14B are formed in the latch plates 5A and 5B, and the lock pins 15A and 15B are projectingly provided in the links 6A and 6B, respectively. Similarly as in the first embodiment, the lock grooves 14A and 14B of the second embodiment are comprised of slide guide portions 14A1 and 14B1 and, stopper portions 14A2 and 14B2, respectively, bent in generally L-shaped configuration. Moreover, the stopper portions 14A2 and 14B2 are in the form of a circular arc centering pivotal shafts 13A and 13B of the links 6A and 6B, respectively. On the other hand, the slide guide portions 14A1 and 14B1 are drawn close to the rotary shafts 9A and 9B of the latch plates 5A and 5B from the end portions of the stopper portions 14A2 and 14B2 and away from the pivotal shafts 13A and 13B of the links 6A and 6B. Therefore, the slide guide portions 14A1 and 14B1 are extended in slantwise direction. The operation of the above-described device of the second embodiment is the same as according to the first embodiment, and therefore the description thereof will be abbreviated here. Although the slide guide portions 14A1 and 14B1 of the lock grooves 14A and 14B are formed in such configuration as to be extended in slantwise direction so that the slide guide portions 14A1 and 14B1 come close to the rotary shafts 9A and 9B of the latch plates from the end portions of the stopper portions 14A2 and 14B2, and away from the pivotal shafts 13A and 13B of the links 6A and 6B as is described hereinabove, it may be possible that the slide guide portions 14A1 and 14B1 are arranged to come close to the pivotal shafts 13A and 13B and away from the rotary shafts 9A and 9B from the end portions at the outer diameter side of the stopper portions 14A2 and 14B2. In this case, the links 6A and 6B are rotated in a direction reverse to that of the second embodiment. In addition, although the links 6A and 6B are pivotally provided at the front side of the fixed plate 4, while the coupling link 6C is provided at the rear side of the fixed plate 4 according to the second embodiment, the links 6A and 6B may be pivotally fixed at the rear side of the fixed plate 4, with the coupling link 6C being provided at the front side of the fixed plate 4. Fig. 41 is an enlargement view of the lock groove 14A in the second embodiment, wherein the lock groove 14A is bent between the slide guide portion 14A1 and the stopper portion 14A2. As shown in Fig. 42, in the modified example of the second embodiment, the inner side portion 14A3 of the bent portion between the slide guide portion 14A1 of the lock groove 14A and the the stopper portion 14A2 may be curved. In this manner, even if the lock pin 15A is not located in the bent angle portion of the lock groove 14A as shown in the imaginary line of Fig. 42, even if the condition is so-called semi-open, the lock pin 15A is guided onto the curved portion 14A3 and is smoothly moved onto the stopper portion 14A2 when the door is tried to be opened from the opposite side, so that the door 1 may be smoothly opened. In Fig. 42, although only the lock groove 14A on the right side is shown, the same thing can be said even about the lock groove 14B on the left side. A modified example of the above-described second embodiment is represented in Figs. 67 to 69, in which the corresponding parts are accordingly designated by the same reference numerals as in the second embodiment. Fig. 67 is a plane view of the device when the door is kept closed. Fig. 68 is a plane view of the device when the door is kept opened. Fig. 69 is an exploded perspective view of the device. The springs 10A,10B are omitted in these Figs. 67 to 69. Figs. 70 to 72 show an embodiment which is another modified example of the second embodiment, and therefore the corresponding parts are designated by the same reference numerals. Fig. 70 is a plane view of a double-openable device when the door is kept closed, whereas Fig. 71 is a plane view when the door is kept opened. Fig. 72 is an exploded perspective view of the device. It is to be noted that the springs 10A, 10B are omitted from Figs. 70 to 72. A still modified example, as an embodiment of the present invention, is shown in Figs. 73 to 75. Since the embodiment is a modification of the second embodiment, parts corresponding to those of the second embodiment are designated by the same reference numerals. Figs. 73 to 75 show a double-openable device of a door according to a third embodiment of the present invention. Fig. 73 is a plane view of the device when the door is kept closed. Fig. 74 is a plane view of the device when the door is kept opened. And Fig. 75 is an exploded perspective view of the device. The springs 10A,10B are omitted in Figs. 73 to 75. 3) Third Embodiment Figs. 43 to 45 show a door in accordance with a third embodiment of the present invention. Fig. 43 is a plane view showing the door when the door is closed Fig. 45 is a perspective exploded view of the door. The third embodiment is a modification of the first embodiment already described earlier, and therefore the corresponding parts thereof to those of the first embodiment are designated by the same reference numerals. What is different of the third embodiment from the first embodiment is found in the fact that the links 6A and 6B are formed generally in L-shaped configuration, and the lock grooves 14A and 14B are formed at end portions of the links 6A and 6B opposite to coupling portions where the links 6A and 6B are coupled to the coupling link 6C, with pivotal shafts 13A and 13B positioned to be fitted in the center of the links 6A and 6B, respectively. The lock pins 15A and 15B of the latch plates 5A and 5B are projected at the side of the front face of the fixed plate 4. The stopper portions 14A2 and 14B2 of the lock grooves 14A and 14B are in a circular arc having the pivotal shafts 13A and 13B of the links 6A and 6B as its center, and the slide guide portions 14A1 and 14B1 are in a shape extending from the end portions of the stopper portions 14A2 and 14B2 to the pivotal shafts 13A and 13B, respectively. The operation of the device of the third embodiment is the same as that of the first embodiment, the description of which will be accordingly abbreviated here. As is described hereinabove, the links 6A and 6B are pivotally provided at the front side of the fixed plate 4 and, the coupling link 6C is provided at the rear side of the fixed plate 4. However, it may be possible that the links 6A and 6B are pivotally provided at the rear side of the fixed plate 4, with the coupling link 6C being at the front side of the fixed plate 4. In this case, the slide guide portions 14A1 and 14B1 of the lock grooves 14A and 14B are extended from the end portions of the stopper portions 14A2 and 14B2 away from the pivotal shafts 13A and 13B of the links 6A and 6B. The rotating direction of the links 6A and 6B becomes reverse to that of the present third embodiment. A modification of the third embodiment is disclosed in Figs. 76 to 78 in which corresponding parts are designated by the same reference numerals as in the third embodiment. Fig. 76 is a plane view of the device, with the door in the closed state. Fig. 77 is a plane view of the device, with the door in the opened state. Fig. 78 is an exploded perspective view of the device. In Figs. 76 to 78, the springs 10A, 10B are omitted. A further modification of the third embodiment is shown in Figs. 79 to 81 in which corresponding parts are designated by the same reference numerals in Figs. 79 to 81 as in the third embodiment. Fig. 79 is a plane view of the device when the door is kept closed. Fig. 80 is a plane view of the device when the door is kept opened. Fig. 81 is an exploded perspective view of the device. It is to be noted that the springs 10A,10B are not illustrated in Figs. 79 to 81. A more further modified example of the third embodiment is shown as an embodiment in Figs. 82 to 84. Since the embodiment is a modification of the third embodiment, the corresponding parts are represented by the same reference numerals. Fig. 82 is a plane view of the device when the door is kept closed. Fig. 83 is a plane view of the device when the door is kept opened. Fig. 84 is an exploded perspective view of the device. The springs 10A,10B are abbreviated in Figs. 82 to 84. 4) Fourth Embodiment In Figs. 46 to 48, a double-openable device of a door according to a fourth embodiment of the present invention is illustrated. Fig. 46 is a plane view of the device when the door is kept closed. Fig. 47 is a plane view when the door is kept opened, and Fig. 48 is an exploded perspective view of the device. The fourth embodiment is a modified example of the above-described third embodiment in which the corresponding parts are represented by the same reference numerals. The difference between the third and fourth embodiments is that the links 6A and 6B are pivotally fixed to the fixed plate 4 at the rear side thereof, and the lock grooves 14A and 14B are provided in the latch plates 5A and 5B, with the lock pins 15A and 15B protruding from the links 6A and 6B, respectively. The stopper portions 14A2 and 14B2 of the lock grooves 14A and 14B are formed in a circular arc having the corresponding pivotal shafts 13A and 13B of the links 6A and 6B at its center. The slide guide portions 14A1 and 14B1 are formed to be extended in slantwise direction coming close to the rotary shafts 9A and 9B of the latch plates 5A and 5B and, the pivotal shafts 13A and 13B of the links 6A and 6B from the end portions of the stopper portions 14A2 and 14B2. Since the device of the fourth embodiment in the above-described construction is operated in the same manner as of the first embodiment, the description thereof will be abbreviated here. Similarly as in the third embodiment, it can be selected as desired whether the coupling link 6C is provided at the rear side or at the front side of the fixed plate 4, or whether the slide guide portions 14A1 and 14B1 of the lock grooves 14A and 14B are extended from the end portions of the stopper portions 14A2 and 14B2 in slantwise direction coming close to the rotary shafts 9A and 9B of the latch plates 5A and 5B or away from the rotary shafts 9A and 9B. It is more desirable, however, to arrange in such manner as to have the coupling link 6C added with the force in the pulling direction when the door 1 is opened/closed simultaneously at both the right and left sides, from the viewpoint of prevention of the deformation of the coupling link 6C, together with considerations taken into the design of the door 1 and the mounting structure of the door 1, etc. An embodiment which is a modification of the above fourth embodiment is illustrated in Figs. 85 to 87 in which the corresponding parts are designated by the same reference numerals as in the fourth embodiment. Figs. 85 to 87 show respectively a plane view when the door is kept closed, a plane view when the door is kept opened, and an exploded perspective view of the device. It is to be noted that the springs 10A,10B are omitted in Figs. 85 to 87. A further modification of the fourth embodiment, that is, an embodiment is shown in Figs. 88 to 90. The corresponding parts to those of the fourth embodiment are designated by the same reference numerals, and Fig. 88 shows a plane view of the device when the door is kept closed, Figs. 89 and 90 being a plane view when the door is kept opened and an exploded perspective view. In these Figs. 88 to 90, the springs 10A,10B are omitted. Moreover, a still further modification of the fourth embodiment is shown in Figs. 91 to 93, which is a modified example of the fourth embodiment and accordingly the corresponding parts are represented by the same reference numerals. Fig. 91 is a plane view of the device when the door is kept closed, Fig. 92 is a plane view when the door is kept opened and Fig. 93 is an exploded perspective view of the device, in which the springs 10A,10B are omitted. In a modified example of the fourth embodiment, slide guide portions 18A1 and 18B1 of lock grooves 18A and 18B may be extended to the direction close to the rotary shafts 9A and 9B of the latch plates 5A and 5B, in other words, the coupling link may be oscillated in the reverse direction to in the fourth embodiment. Such modified example as referred to above is shown in Figs. 94 to 96 as an embodiment. The corresponding parts of the embodiment are designated by the same reference numerals as in the fourth embodiment. Figs. 94 to 96 show respectively a plane view of the device when the door is kept closed, a plane view of the device when the door is kept opened and an exploded perspective view of the device. In these Figs. 94 to 96, the springs 10A,10B are omitted. Referring to Figs. 97 to 99, a yet further modification of the fourth embodiment is indicated in which the corresponding parts are designated by the same reference numerals as in the fourth embodiment. Fig. 97 shows a plane view of the device when the door is kept closed. Fig. 98 is a plane view of the device when the door is kept opened. Fig. 99 is an exploded perspective view of the device. It is to be noted that the springs 10A,10B are omitted in Figs. 97 to 99. A more modified example of the fourth embodiment is shown in Figs. 100 to 102 as an embodiment of the present invention, having the corresponding parts designated by the same reference numerals as in the fourth embodiment. Figs. 100 to 102 are respectively a plane view of the device when the door is kept closed, a plane view of the device when the door is kept opened, and an exploded perspective view of the device, with the spring 10 being omitted therein. A still more modified example of the fourth embodiment, as an embodiment, is shown in Figs. 103 to 105. The corresponding parts of the embodiment are designated by the same reference numerals as in the fourth embodiment. Fig. 103 is a plane view of the device when the door is kept closed. Fig. 104 is a plane view of the device when the door is opened. Fig. 105 is an exploded perspective view of the device. The springs 10A,10B are omitted in Figs. 103 to 105, though. 5) Fifth Embodiment Figs. 49 to 51 are related to a fifth embodiment of the present invention; Fig. 49 being a plane view of the device when the door is kept closed, Fig. 50 being a plane view of the device when the door is kept opened and Fig. 51 being an exploded perspective view of the device. The opening/closing device according to the fifth embodiment of the present invention is the same as the device of the first embodiment in the fact that the opening/closing device of the fifth embodiment includes a pair of hinge pins 2A and 2B protrudingly provided at the opposite right and left sides of the door 1, the fixed plate 4 having engaging grooves 7A and 7B, a pair of right and left latch places 5A and 5B having respective latch grooves 8A and 8B, and a pair of springs 10A and 10B urging the latch plates 5A and 5B to position the hinge pins 2A and 2B both in the restrained condition and in the restriction-releasing condition. Therefore, the corresponding parts of the fifth embodiment are represented by the same reference numerals as in the first embodiment, and the detailed description will be abbreviated. What is different from the device of the first embodiment resides in that a coupling means 17 which prohibits the rotation of the one latch plate 5B (5A) in association with the rotation of the other latch plate 5A (5B) of the restriction-releasing direction is comprised of one lever which is pivotally and slidably fixed to the fixed plate 4 by a support shaft 18 in the middle of the right and left latch plates 5A and 5B. At the opposite end portions of the coupling means 17 are formed lock grooves 19A and 19B with which lock pins 20A and 20B respectively protrudingly provided in the latch plates 5A and 5B are engaged. Each of the above-mentioned lock grooves 19A and 19B generally in L-shaped configuration has a slide guide portion 19A1 or 19B1 extending away from the support shaft 18 of the coupling means 17 and, a stopper portion 19A2 or 19B2 provided along a circular arc centering the support shaft 18. In the above-described construction, when the door 1 is opened at the right side, as shown in Fig. 49, the right hinge pin 2A is pulled to slip from the engaging groove 7A, so that the right latch plate 5A is rotated in the clockwise direction, namely, in the restriction-releasing direction. At this time, the lock pin 20A provided in the latch plate 5A slides in the slide guide portion 19A1 of the lock groove 19A thereby to oscillate the coupling means 17 in the clockwise direction. At the side of the other latch plate, namely, left latch plate 5B, the end portion of the coupling means 17 is moved away from the latch plate 5B and the lock pin 20B is fitted in the stopper portion 19B2 of the lock groove 19B at the end portion of the coupling means 17. Accordingly, the latch plate 5B is prohibited from rotating, so that the left hinge pin 2B is kept in the restrained state. In the case where the door 1 is to be opened from the left side, the operation reversed in the right and left directions effects the opening of the door member. The coupling means 17 may be provided at the front side of the fixed plate 4 also in the present embodiment. In this case, the stopper portions 19A2 and 19B2 of the lock grooves 19A and 19B are in a circular arc centering the support shaft 18, while the slide guide portions 19A1 and 19B1 are extended to be close to the support shaft 18 from the end portions at the rear side of the stopper portions 19A2 and 19B2. A modified example as referred to above is illustrated in Figs. 106 to 108, in which is a modification of the fifth embodiment, the corresponding parts are designated by the same reference numerals as in the fifth embodiment. Figs. 106 to 108 show a plane view of the device when the door is kept closed, a plane view of the device when the door is kept opened, and an exploded perspective view of the device, respectively. the springs 10A,10B are omitted in Figs. 106 to 108. 6) Sixth embodiment Figs. 52 to 54 which illustrate an opening /closing device according to a sixth embodiment of the present invention are respectively a plane view of the device when the door is kept closed, a plane view of the device when the door is kept opened, and an exploded perspective view of the device. The opening/closing device of the present embodiment is the same as the device of the first embodiment in the fact that the device according to the present embodiment includes a pair of right and left hinge pins 2A and 2B protrudingly provided at the opposite right and left sides of the door 1, the fixed plate 4 having engaging grooves 7A and 7B, a pair of right and left latch plates 5A and 5B having latch grooves 8A and 8B, and springs 10A and 10B urging the latch plates 5A and 5B so as to restrict the hinge pins 2A and 2B and, to release the restriction of the hinge pins 2A and 2B. The same parts of the sixth embodiment as in the first embodiment are represented by the same reference numerals. Meanwhile, the device of the present embodiment is different from that of the first embodiment in that a coupling means 21 which prohibits the rotation of the one latch plate 5B (5A) in association with the rotation of the other latch plate 5B (5A) in the restriction-releasing direction is comprised of one lever having lock pins 22A and 22B protruding at the opposite right and left end portions thereof. The lock pins 22A and 22B are engaged with respective slide grooves 23A and 23B formed in the fixed plate 4. When the lock pins 22A and 22B are slided in the slide grooves 23A and 23B, the coupling lever 21 is oscillated right and left. The slide grooves 23A and 23B which are bent generally in L-shape are comprised of slide guide portions 23A1 and 23B1 extending in a direction away from the slide grooves 23B and 23A, and stopper portions 23A2 and 23B2 extending in a slantwise direction away from the rotary shafts 9A and 9B of the latch plates 5A and 5B, respectively. Each of the latch plates 5A and 5B is formed a lock groove 24A or 24B at the position corresponding to the stopper portion 23A2 or 23B2 with which is engaged the other end portion of the lock pin 22A or 22B of the coupling means 21. In the foregoing construction of the device, when the door 1 is opened from the right side as shown in Fig. 52, the right hinge pin 2A is pulled to be slipped off from the engaging groove 7A. Therefore, the right latch plate 5A is rotated in the clockwise direction, namely, in the restriction-releasing direction. At this time, since the lock pin 22A provided in the coupling means 21 is positioned at the inner end portion of the lock groove 24A and at the corner of the slide groove 23A, while being added the force in the right direction by the lock groove 24A, the lock pin 22A is slided in the slide guide portion 23A1 of the slide groove 23A, thereby oscillating the coupling means 21 in the right direction. Because of the oscillation of the coupling means 21, the lock pin 22B protruding at the end portion for the coupling means 21 is moved in a direction away from the latch plate 5B, at the side of the left latch plate 5B. Therefore, the lock pin 20B comes to be fitted into the end portion at the outer diameter side of the lock groove 24B and the stopper portion 23B2 of the slide groove 23B. consequent to this, the rotation of the latch plate 5B is prohibited, and the left hinge pin 2B is held in the restrained state. When the door 1 is opened from the left side, the operation reversed in the right and left directions will open the door 1. Also in the instant embodiment, the coupling means 21 may be provided at the front side of the fixed plate 4. In this case, the slide guide portions 23A1 and 23B1 of the slide grooves 23A and 23B are respectively extended in a direction away from the slide grooves 23B and 23A. Moreover, the stopper portions 23A2 and 23B2 are extended from the outer end portions of the slide guide portions 23A1 and 23B1 in a slantwise direction away from the rotary shafts 9A and 9B of the latch plates 5A and 5B. The lock grooves 24 and 24B of the latch plates 5A and 5B are formed at a corresponding position to the stopper portions 23A2 and 23B2 at the front side thereof. An embodiment of the present invention which is a modification of the sixth embodiment is illustrated in Figs. 109 to 111 in which the corresponding parts are designated by the same reference numerals. Fig. 109 is a plane view of the device when the door 1 is kept closed. Fig. 110 is a plane view of the device when the door 1 is kept opened. Fig. 111 is an exploded perspective view of the device. In Figs. 109 to 111, the springs 10A,10B are omitted. 7) Seventh embodiment Figs. 55 to 57 are related to an opening/closing device according to a seventh embodiment of the present invention; Fig. 55 being a plane view of the device when the door member is kept closed, Fig. 56 being a plane view of the device when the door member is kept opened, and Fig. 57 being an exploded perspective view of the device. The opening/closing device of the present 7th embodiment is the same as that of the first embodiment in that the device includes a pair of hinge pins 2A and 2B protrudingly provided at the opposite right and left sides of the door 1, the fixed plate 4 having engaging grooves 7A and 7B, a pair of right and left latch plates 5A and 5B having respective latch grooves 8A and 8B, and a pair of springs 10A and 10B urging the latch plates 5A and 5B to position the hinge pins 2A and 2B in the restrained condition and in the restriction-releasing condition. Therefore, the same parts of the 7th embodiment as in the first embodiment are designated by the same reference numerals, and the detailed description will be abbreviated. The difference of the device of the present embodiment from that of the first embodiment is that a coupling means 25 which prohibits the rotation of the one latch plate 5B (5A) in association with the rotation of the other latch plate 5A (5B) in the restriction-releasing direction is comprised of a pair of two coupling levers 25A and 25B. The coupling lever 25A which is positioned above the latch plates 5A and 5B in the drawings is pivotally fixed at the left end thereof to the peripheral portion of the left latch plate 5B, whereas at the right end of the coupling lever 25A a lock pin 26A is protruded which is fitted in a slide guide groove 27A formed in the fixed plate 4, so that the lock pin 26A is guided in a radius direction of the latch plate 5A by the slide guide groove 27A. There is formed a lock groove 28A opening to the outer-diameter side in the latch plate 5A correspondingly to the slide guide groove 27A. When the latch plate 5A is at the position to restrict the hinge pin 2A, the lock groove 28A comes overlapped with the slide guide groove 27A. The other coupling lever 25B which is lower than the latch plates 5A and 5B has the construction reversed to the above-described coupling lever 25A in the right and left sides. The right end of the coupling lever 25B is pivotally fixed to the peripheral portion of the right latch plate 5A, and the left end of the coupling lever 25B is provided with a protruding lock pin 26B. A slide guide groove 27B for leading the lock pin 26B is formed at the left side of the fixed plate 4. Further, a lock groove 28B is formed opening to the outer diameter side in the left latch plate 5B. In the above-described construction, when the door member is kept closed, as shown in Fig. 76, the lock pins 26A and 26B of the coupling levers 25A and 25B are out of the lock grooves 28A and 28B, respectively, enabling the latch plates 5A and 5B to be rotated. Then, when the door 1 is opened from the right side, as shown in Fig. 56, the right hinge pin 22A is pulled to slip from the engaging groove 7A, and the right latch plate 5A is rotated in the clockwise direction, that is, in the restriction-releasing direction. In accordance with the rotation of the latch plate 5A, the lower coupling lever 25B is pulled rightward, and the lock pin 26B protruding at the left end of the coupling lever 25B is fitted into the lock groove 8B of the left latch plate 5B. Accordingly, the left latch plate 5B is prohibited from rotating. In this case, the upper coupling lever 25A is not displaced in spite of the rotation of the right latch plate 5A since the lock pin 26A is not fitted in the lock groove 28A, thereby to be maintained in the original state. When the door 1 is desired to be opened from the left side, it can be done by the reverse operation in the right and left directions. Although the coupling lever 25A is pivotally fixed at the rear side to the latch plates 5A and 5B according to the present embodiment, it may be pivotally fixed at the front side. In this case, the slide guide grooves 27A and 27B of the fixed plate 4, and the lock grooves 28A and 28B formed in the latch plates 5A and 5B should be formed from the center of the fixed plate 4. A modified example of the 7th embodiment is shown in Figs. 112 to 114 in which the corresponding parts are designated by the same reference numerals as in the 7th embodiment. Fig. 112 is a plane view of the device when the door member is kept closed. Fig. 113 is a plane view of the device when the door member is kept closed. Fig. 113 is a plane view of the device when the door member is kept opened, and Fig. 114 is an exploded perspective view of the device. The springs 10A,10B are omitted in Figs. 112 to 114. 8) Other Embodiments In each of the foregoing embodiments described above, the hinge pins 2A and 2B are provided in the door 1 and the fixed plate 4 is provided in the main body 3. On the contrary to this, the hinge pins 2A and 2B may be provided in the main body 3 and the fixed plate 4 may be provided in the door 1. Moreover, the fixed plate 4 is not necessarily formed by one plate, but may be divided into the right and left parts. Or, the fixed plate 4 may be formed by two plates so as to sandwich the latch plates 5A and 5B, and the coupling means 6, 17, 21 and 25 from up and down. The present invention is not restricted to the above-described embodiments, but can be applied widely in general door members other than for the refrigerator. Various modifications may be possible within the scope of the present invention. For instance, one end of each of the springs 10A and 10B is rotatably and pivotally fixed to a shaft 11A or 11B protruding at an end portion of the latch plate 5A or 5B opposite to the latch groove 8A or 8B, and the other end of the spring 10A or 10B is also rotatably and pivotally fixed to a check shaft 12A or 12B protrudingly provided in the fixed plate 4. Each of the check shafts 12A and 12B is mounted in such portion as to be approximately in the center of the angular area defined by the shafts 11A or 11B and, rotary shafts 9A or 9B when the latch plates 5A and 5B are rotated between the position where the latch plates 5A and 5B restrict the hinge pins 2A and 2B and, the position where the restriction of the hinge pins 2A and 2B by the latch plates 5A and 5B is released. Each of the springs 10A and 10B is arranged to be applied pressure in such direction that the opposite ends thereof are always extended outwards. Accordingly, the springs 10A and 10B are provided to press the door 1 toward the main body 3, and it is not necessary to provide a magnet within a packing of the door. According to the present invention, the door can be opened only by pulling the door from the desired right or left side, without necessities for rotating an operating handle therefor. Therefore, the door can be freely designed according to the present invention, either no restrictions. Moreover, the door can be opened/closed from the inside of the refrigerator according to the present invention, whereby such dangerous accident that an infant be confined within the refrigerator can be prevented. Moreover, the device according to the present invention can be incorporated in the upper and lower edge portions of the door, or in the corresponding parts of the main body, and no special mechanism is required to be provided inside the door. Accordingly, the inner construction of the door is enough to be unchanged, and the adiabatic efficiency is never deteriorated. Although the present invention has been fully described in connection with the preferred embodiments thereof with reference to the accompanying drawings, it is to be noted that various changes and modifications are apparent to those skilled in the art. Such changes and modifications are to be understood as included within the appended scope of the present invention as defined by the appended claims unless they depart therefrom.

Claims: An opening/closing device of a left-hand or right-hand openable door which comprises: a) a pair of right and left hinge pins (2A, 2B) protrudingly provided at the opposite right and left side portions of either one of a door member (1) and a main body (3) on which said door member (1) is mounted; b) a fixed plate (4) provided in the other one of said door member (1) and said main body (3) which has engaging grooves (7A, 7B) to be detachably engaged with said hinge pins (2A, 2B) from the opening side of the door member (1); c) a pair of latch plates (5A, 5B) rotatably provided at the opposite right and left side portions of said fixed plate (4) each of which has a latch groove (8A, 8B) opening to the outer-diameter side of said latch plate (5A, 5B) so that said latch plate (5A, 5B) is detachably engaged by said latch groove (8A, 8B) with said hinge pin (2A, 2B) to restrict the hinge pin (2A, 2B) in said engaging groove (7A, 7B); and d) a coupling means (6) provided between said pair of latch plates (5A, 5B) which controls the rotation of said one latch plate (5A or 5B) in association with the rotation of said other latch plate (5B or 5A) of the restriction-releasing direction; characterized in that e) said coupling means (6) includes a pair of links (6A, 6B) each pivotally fixed to said fixed plate (4) in the vicinity of said right and left latch plate (5A, 5B), and a coupling link (6C) coupling one end portion of said pair of links (6A, 6B), a lock groove (14A, 14B) consisting of a slide guide portion (14A1, 14B1) and a stopper portion (14A2, 14B2) is formed in L-shaped configuration or in bent shape in either one of said link (6A, 6B) and said latch plate (5A, 5B), and a lock pin (15A, 15B) is protrudingly provided in the other one of said link (6A, 6B) and said latch plate (5A, 5B) for restricting the rotation of the latch plate (5A, 5B) through engagement with said lock groove (14A, 14B); and f) a pair of springs (10A, 10B) is provided each for urging said latch plate (5A, 5B) both in a restricting position where said latch plate (5A, 5B) restricts said hinge pin (2A, 2B) and in a restriction-releasing position where said latch plate (5A, 5B) releases the restriction of said hinge pin (2A, 2B). An opening/closing device as claimed in claim 1, wherein the links (6A, 6B) are of an L-shape. An opening/closing device of a left-hand or right-hand openable door which comprises: a) a pair of right and left hinge pins (2A, 2B) protrudingly provided at the opposite right and left side portions of either one of a door member (1) and a main body (3) on which said door member (1) is mounted; b) a fixed plate (4) provided in the other one of said door member (1) and said main body (3) which has engaging grooves (7A, 7B) to be detachably engaged with said hinge pins (2A, 2B) from the opening side of the door member (1); c) a pair of latch plates (5A, 5B) rotatably provided at the opposite right and left side portions of said fixed plate (4) each of which has a latch groove (8A, 8B) opening to the outer-diameter side of said latch plate (5A, 5B) so that said latch plate (5A, 5B) is detachably engaged by said latch groove (8A, 8B) with said hinge pin (2A, 2B) to restrict the hinge pin (2A, 2B) in said engaging groove (7A, 7B); and d) a coupling means (6) provided between said pair of latch plates (5A, 5B) which controls the rotation of said one latch plate (5A or 5B) in association with the rotation of said other latch plate (5B or 5A) of the restriction-releasing direction; characterized in that e) the coupling means (6) is formed as a lever (17) being pivotally fixed to the fixed plate (4) by a support shaft (18) in the middle of the right and left latch plates (5A, 5B), a lock groove (19A, 19B) having a slide guide portion and a stopper portion and being formed in an L-shaped configuration or a bent shape is provided respectively in both end portions of the lever (17), and wherein a lock pin (20A, 20B) for regulating the latch plate (5A, 5B) though the engagement with the lock groove (19A, 19B) projects from the respective latch plate (5A, 5B); and f) a pair of springs (10A, 10B) is provided each for urging said latch plate (5A, 5B) both in a restricting position where said latch plate (5A, 5B) restricts said hinge pin (2A, 2B) and in a restriction-releasing position where said latch plate (5A, 5B) releases the restriction of said hinge pin (2A, 2B). An opening/closing device of a left-hand or right-hand openable door which comprises: a) a pair of right and left hinge pins (2A, 2B) protrudingly provided at the opposite right and left side portions of either one of a door member (1) and a main body (3) on which said door member (1) is mounted; b) a fixed plate (4) provided in the other one of said door member (1) and said main body (3) which has engaging grooves (7A, 7B) to be detachably engaged with said hinge pins (2A, 2B) from the opening side of the door member (1); c) a pair of latch plates (5A, 5B) rotatably provided at the opposite right and left side portions of said fixed plate (4) each of which has a latch groove (8A, 8B) opening to the outer-diameter side of said latch plate (5A, 5B) so that said latch plate (5A, 5B) is detachably engaged by said latch groove (8A, 8B) with said hinge pin (2A, 2B) to restrict the hinge pin (2A, 2B) in said engaging groove (7A, 7B); and d) a coupling means (6) provided between said pair of latch plates (5A, 5B) which controls the rotation of said one latch plate (5A or 5B) in association with the rotation of said other latch plate (5B or 5A) of the restriction-releasing direction; characterized in that e) the coupling means (6) is formed of a lever (21) and includes a lock pin (22A, 22B) provided at its right and left end portions, and a lock groove (23A, 23B) is provided on the fixed plate (4) with a slide guide portion and a stopper portion being formed in an L-shaped configuration or a bent shape, the lock pin (22A, 22B) is engaged into the lock groove (23A, 23B), and each of the latch plates (5A, 5B) is provided with a lock groove (24A, 24B) for engaging detachably with the lock pin (22A, 22B) of the lever (21) therein; and f) a pair of springs (10A, 10B) is provided each for urging said latch plate (5A, 5B) both in a restricting position where said latch plate (5A, 5B) restricts said hinge pin (2A, 2B) and in a restriction-releasing position where said latch plate (5A, 5B) releases the restriction of said hinge pin (2A, 2B). An opening/closing device of a left-hand or right-hand openable door which comprises: a) a pair of right and left hinge pins (2A, 2B) protrudingly provided at the opposite right and left side portions of either one of a door member (1) and a main body (3) on which said door member (1) is mounted; b) a fixed plate (4) provided in the other one of said door member (1) and said main body (3) which has engaging grooves (7A, 7B) to be detachably engaged with said hinge pins (2A, 2B) from the opening side of the door member (1); c) a pair of latch plates (5A, 5B) rotatably provided at the opposite right and left side portions of said fixed plate (4) each of which has a latch groove (8A, 8B) opening to the outer-diameter side of said latch plate (5A, 5B) so that said latch plate (5A, 5B) is detachably engaged by said latch groove (8A, 8B) with said hinge pin (2A, 2B) to restrict the hinge pin (2A, 2B) in said engaging groove (7A, 7B); and d) a coupling means (6) provided between said pair of latch plates (5A, 5B) which controls the rotation of said one latch plate (5A or 5B) in association with the rotation of said other latch plate (5B or 5A) of the restriction-releasing direction; characterized in that e) the coupling means (6) includes a pair of coupling levers (25A, 25B), one end portion of each of the coupling levers (25A, 25B) being pivotally mounted on the periphery portion of the counterpart latch plate (5A, 5B) disposed at the different side of right and left with each other, a lock pin (26A, 26B) is provided at the other end portion of each of the coupling levers (25A, 25B) for controlling the rotation of the latch plate, a lock groove (27A, 27B) is provided in an L-shaped configuration or a bent shape at the fixed plate (4) disposed at the other side of the latch plates (5A, 5B), the lock pin (26A, 26B) being engaged into the lock groove (27A, 27B) and each of the latch plates (5A, 5B) is provided with a lock groove (28A, 28B) for engaging detachably with the lock pin (26A, 26B) of the coupling levers (25A, 25B) therein; and f) a pair of springs (10A, 10B) is provided each for urging said latch plate (5A, 5B) both in a restricting position where said latch plate (5A, 5B) restricts said hinge pin (2A, 2B) and in a restriction-releasing position where said latch plate (5A, 5B) releases the restriction of said hinge pin (2A, 2B). An opening/closing device as claimed in any of claims 1 to 5, further comprising safety means each actuated in the vicinity of said latch plate (5A, 5B) at the other side than the opening side of the door member (1) so as to control the rotation of said latch plate (5A, 5B) at the other side than the opening side when said door member (1) is kept open wherein the safety means comprises safety plates (29A, 29B) projecting from the door member (1) and springs (31A, 31B) for biasing the respective safety plates (29A, 29B) for controlling the movement of the coupling means between the latch plates by means of a safety groove (32A, 32A1, 32A2; 32B, 32B1, 32B2) formed in a crooked shape in the safety plate and, a safety pin (33A, 33B) of the link (6A, 6B). An opening/closing device as claimed in any of claims 1 to 6, wherein the hinge pins (2A, 2B) are provided at the upper, lower, right and left corner portions of the main body (3). An opening/closing device as claimed in any of claims 1 to 7, characterized by screening plates (106A, 106B) which are rotatably urged in the direction of choking the engagement grooves (7A, 7B) of the fixed plate (4) and are disposed on either one of the fixed plate (4) and the portion at which the fixed plate (4) is mounted. An opening/closing device as claimed in any of claims 1 to 8, wherein the pair of hinge pins (2A, 2B) and the respective fixed plate (4), the latch plates (5A, 5B) and the coupling means (6) are provided respectively above and below the door member (1) and the main body (3).

Inventors: HASEGAWA TOORU, INUI YOSHIO, KAI HIDEKAZU, KAMIKUBO HIROSHI, KAMITAKA MASUO, MIYAMOTO MASAO, OSAKA MASAYOSHI, TANAKA MITSUO, HASEGAWA, TOORU, INUI, YOSHIO, KAI, HIDEKAZU, KAMIKUBO, HIROSHI, KAMITAKA, MASUO, MIYAMOTO, MASAO, OSAKA, MASAYOSHI, TANAKA, MITSUO
Applicants: SHARP KK, SHARP KABUSHIKI KAISHA
Application year: 1989
Main classification: E05D15
IPC codes: F25D23, E05D15