Door switch for refrigerator

A door switch for a refrigerator includes a case having a hole on one side; switch terminal units installed inside the case and making on/off operations of a circuit; a plunger for changing the on/off operations of the circuit mechanically while moving inward/outward of the case through the hole on the case; and a restriction means installed on the case for restricting the movement of the plunger, whereby a chamber light can be turned off even if the door of refrigerator is opened, and therefore power consumption of the refrigerator can be reduced.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The door switch for a refrigerator according to the first embodiment of the present invention will be described with reference to FIG. 3 through FIG. 6 . FIGS. 3 and 4 are drawings showing the operating state of the door switch when the door is opened. FIG. 3 is a perspective view showing the door switch for the refrigerator according to the present invention, and FIG. 4 is a cross sectional view of line A-A in FIG. 3 . In addition, FIGS. 5 and 6 are drawings showing a state that the operation of the door switch is prevented. FIG. 5 is a perspective view showing the door switch according to the present invention, and FIG. 6 is a crosssectional view of line B-B in FIG. 5 . The door switch according to the present invention is constructed such that the plunger 23 protrusive upwardly from the case 20 is moved to inside/outside of the case 20 in accordance with opening/closing of the door, and at the same time, the movable contactor 26 and the fixed contactor 27 connected to the plunger 23 mechanically are contacted or separated according to the operation of the plunger 23 . That is, the plunger protrusive out of the case 20 is linearly moved according to opening/closing of the door, and rotates the contact operation lever 25 to right/left directions, whereby the movable contactor 26 is separated/contacted from/to the fixed contactor 27 . Herein, as shown in FIG. 4 , the plunger is divided into two parts, that is, a part 23 a exposed out of the case 20 and a part 23 b always inserted inside the case 20 . In addition, a stopper 23 d is formed between the two parts so that the plunger 23 is not came out of the case by caught on the case 20 . Especially, a contact protrusion 23 c rotating the contact operation lever 25 is formed on the part 23 b inserted inside the case 20 of the plunger 23 , expanded from the part 23 b to radial direction. The plunger 23 is provided a force to move outside the case 20 by an elastic member 24 supported inside the case 20 . In addition, a contact operation lever 25 rotated by the contact protrusion 23 c when the plunger 23 is moved is installed inside the case 20 , and the contact operation lever 25 is provided elastic force so as to adhere to the contact protrusion 23 c always. On the other hand, the case is made by assembling a switch body 21 and a switch cover 22 with each other. A plunger passage hole 22 a is formed on the switch cover 22 so that the plunger 23 is protrusive out of the case 20 . A plunger guide 22 b is formed on boundary of the switch passage hole 22 a protrusive out of the case in order to support the plunger 23 so that the protruded part of the plunger 23 is not damaged, and to guide the moving passage of the plunger 23 . Especially, a pair of guide rails 22 c of a certain height are formed on both sides of the plunger guide 22 b on upper surface of the switch cover 22 . The pair of guide rails 22 c are formed parallelly with each other, and a guide projection 22 d protrusive as facing each other is formed on upper end part of the guide rail. A restriction plate 28 is inserted between the pair of guide rails 22 c so as to prevent the protrusion of the plunger 23 out of the case 20 . The restriction plate 28 is formed to have a length longer than that of the guide rails 22 c . In addition, both sides of the restriction plate 28 are flanged as cranks, and have guide recesses 28 a coupled to the guide projection 22 d of the guide rails 22 c in length direction. The guide recesses 28 a is formed to have length longer than that of the guide rail 22 c , and a moving restriction projections 28 c and 28 c ' are formed on both ends of the recesses 28 a so that the guide recesses 28 a are caught on the guide projections 22 d of the guide rails 22 c. Herein, the moving restriction projections 28 c restrict the moving range of the restriction plate 28 along with the guide rails 22 c , and at the same time, prevents the restriction plate 28 from seceding from the guide rails 22 c. Also, the guide recesses 28 a are formed long on the upper part on side surface of the restriction plate 28 , accordingly, a stopping projection 28 b is formed long on lower part of the side surface of the restriction plate 28 so as to be caught on bottom surface of the guide projections 22 d of the guide rails 22 c. On the other hand, the bottom surface of the restriction plate 28 is plan and is supported by the upper end part of the plunger guide 22 b. Therefore, the bottom surface of the restriction plate 28 is supported by the plunger guide 22 b in the state that the stopping projections 28 b on both sides are caught by the guide projections 22 d of the guide rails 22 d , whereby the moving in vertical direction of the plunger 23 is restrained. In addition, the restriction plate 28 is able to move to horizontal direction, that is, crossed direction with the moving direction of the plunger 23 along with the guide rails 22 c. Especially, a plunger releasing hole 28 d having same size with the plunger passage hole 22 a of the switch cover 22 is formed on the restriction plate 28 . As shown in FIG. 3 , it is desirable that the plunger releasing hole 28 d is formed on a position corresponding to that of the plunger passage hole 22 a when the restriction plate 28 is not able to move because the moving restriction projection 28 c ' of the restriction plate 28 and the end part of the guide rails 22 c are adhered to each other. In addition, it is desirable that the plunger releasing hole 28 d has a diameter through which the plunger 23 is able to pass, but the plunger guide 22 b is not able to pass. Therefore, the restriction plate 28 is able to move along with the guide rails 22 c , and makes the plunger 23 be protruded through the plunger releasing hole 28 d as shown in FIG. 3 or restricts the plunger 23 so that the plunger is inserted in the case 20 by blocking the plunger passage hole 22 a , as shown in FIG. 5 . On the other hand, a handle recess 28 e of concave shape may be formed on upper surface of the restriction plate 28 so that the user is able to operate easily. Operation and effect of the door switch for a refrigerator according to the present invention will be described as follows. The door switch 20 for the refrigerator is installed on the wall inside a chilling chamber or on front surface of the main body so that the door is contacted to the switch. As shown in FIGS. 3 and 4 , in order to turn on/off the chamber light in accordance with opening/closing of the door, the restriction plate 28 is moved to correspond the plunger releasing hole 28 d to the plunger passage hole 22 a , so that the plunger 23 of the door switch is able to turn on/off the switch while moving according to the opening/closing state of the door. At that time, when the door is closed, the plunger 23 rotates the contact operation lever 25 while being pushed into the case 20 , and then the movable contactor 26 is separated from the fixed contactor 27 , whereby the switch of the chamber light is turned off and the light is also turned off. On the contrary, when the door is opened, the plunger 23 is protruded outside of the case 20 by the restoring force of the elastic member 24 through the plunger passage hole 22 a of the case and through the plunger releasing hole 28 d of the restriction plate 28 , and at that time, the movable contactor 26 is also contacted to the fixed contactor 27 by the elastic force of itself, whereby the chamber light is turned on. In addition, in order to turn off the chamber light even if the door is opened, as shown in FIGS. 5 and 6 , the user blocks the plunger passage hole 22 a by moving the restriction plate 28 along with the guide rails 22 c in the state that the user pushes the plunger 23 into the case 20 . At that time, the protrusion of the plunger out of the case is restricted by the bottom surface of the restriction plate 28 , and the movable contactor 26 is separated from the fixed contactor 27 as shown in FIG. 6 , whereby the chamber light is turned off even if the door is opened. The operation described above may be needed when the user uses the refrigerator at daytime or when it is bright around the refrigerator. If the user wants to turn on the chamber light when the door is opened from the state described above, as shown in FIG. 4 , the user makes the plunger releasing hole 28 d of the restriction plate 28 be located on upper part of the plunger passage hole 22 a by moving the restriction plate 28 , whereby the plunger 23 is protruded out of the case when the door is opened and the chamber light is turned on. A second embodiment of the door switch for a refrigerator according to the present invention will now be described. FIG. 7 is a cross-sectional view showing a state that the operation of the door switch is prevented according to the second embodiment of the present invention. The door switch according to the second embodiment of the present invention does not include the plunger guide 22 b included in the first embodiment, and an restriction plate 38 is installed adhering directly on upper surface of a switch cover 32 . Therefore, the restriction plate 38 is moved as sliding in the state that both sides of the plate 38 are inserted into a guide rails 32 c , and restricts or releases the moving of the plunger 33 . Of course, a plunger releasing hole 38 d is formed on the restriction plate 38 so that the plunger 33 is protruded out of the case 30 . In case that the plunger releasing hole 38 d of the restriction plate 38 corresponds to a plunger passage hole 32 a of the case 30 , the plunger releasing hole 38 d guides moving of the plunger 33 like the plunger guide in the first embodiment, and at the same time, supports the plunger 33 . In the second embodiment, the height of the guide rails 32 c supporting the restriction plate 38 is formed lower than that of the guide rails in the first embodiment. Guide projections 32 d are protruded facing each other on the upper end part of the guide rail 32 c and are coupled to the guide recesses 38 a formed on both sides of the restriction plate 38 , whereby the guide rails 32 c guides the moving of the restriction plate 38 to left/right directions. A door switch for a refrigerator according to third embodiment of the present invention will be described with reference to FIG. 8 . FIG. 8A is a perspective view showing the door switch for the refrigerator according to the third embodiment of the present invention, and FIG. 8B is a cross-sectional view of line C-C in FIG. 8A . The door switch for the refrigerator according to the third embodiment of the present invention is constructed unlike those of first and second embodiments, such that an restriction plate 48 is moved frontward/backward in the length direction of a case 40 , and is able to restrict or release a plunger 43 . Especially, the restriction plate 48 does not include the plunger releasing hole. That is, a pair of guide rails 42 c are formed on both sides of the case 40 in the length direction, and the restriction plate 48 is inserted between the guide rails 42 c . And as shown in FIG. 8B, a recess 42 d and a protrusion 48 a coupled with each other as concave/convex structure are formed on the guide rails 42 c and on the restriction plate 48 respectively, whereby the linear movement of the restriction plate 48 is guided. Of course, moving restriction projections 48 c are formed on both end part of the protrusions on the restriction plate 48 so that the restriction plate 48 is not seceded from the guide rails, and at the same time, the movement range is restricted. Therefore, if the restriction plate 48 is moved to right in FIG. 8 A, the plunger guide 42 c and the plunger passage hole 42 a are opened and the plunger 43 is able to move freely. However, if the restriction plate 48 is moved to left, the plunger passage hole 42 a is blocked and the movement of the plunger 43 out of the case is restricted. A door switch for a refrigerator according to fourth embodiment of the present invention will be described with reference to FIG. 9 . FIG. 9 is a cross-sectional view showing the door switch for refrigerator according to the fourth embodiment of the present invention. The door switch for a refrigerator according to the fourth embodiment of the present invention is opened/closed using a hinge, and therefore it is constructed different from the sliding structure in first, second, and third embodiments. That is, in the door switch for a refrigerator according to the fourth embodiment of the present invention, an restriction plate 58 is connected to upper part of the case 50 using a hinge 60 and is opened/closed to ′S' in FIG. 9 , whereby the plunger passage hole 52 a is opened. Herein, a front end part of the restriction plate 58 is coupled to the stopping protrusion part 52 c protruded from the case 50 using a hook, and therefore the opening of the restriction plate 58 is prevented. The hook structure includes a hook 58 a formed on the restriction plate 58 and a stopping projection 52 d formed on the stopping protrusion part 52 c , and the state that the restriction plate 58 is blocking the plunger passage hole 52 a is maintained. On the other hand, an asperity part 52 e is formed on upper end part of the stopping protrusion part 52 c , therefore if the user presses to ° F. direction in FIG. 9 , the asperity part 52 e is turned over and the restriction plate 58 is released. As described above, in case that the stopping protrusion part 52 c does not restrict the restriction plate 58 , the plunger 53 is protruded out of the case while pushing the restriction plate 58 by the elastic member 54 , whereby the plunger 53 turns on/off the chamber light according to the opening/closing of the door. According to the door switch of the present invention, the chamber light is able to be turned on/off in the state that the door is opened by operating the restriction plate, and therefore the user is able to use the refrigerator more conveniently. Also, according to the door switch of the present invention, the user is able to turn off the chamber light even if the door is opened, and therefore the power consumption caused by turning on the chamber light inefficiently can be reduced. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalence of such meets and bounds are therefore intended to be embraced by the appended claims.