GUIDING DEVICE FOR SLIDING DOORS WHICH ARE RECIPROCALLY COOPLANAR AT THE CLOSED POSITION THEREOF

Abstract: Guiding device for sliding doors being coplanar at the closed position thereof, two groups of sliding doors (11-12) of which disposed alternately each other are slidably supported at their lower and upper ends respectively on a first and a se­ cond group (21i-21s;31i-31s) of longitudinal and parallel rectilinear guide members, arranged frontally on the lower and upper part of a relative furniture. The doors (11) of the first group are connected by rigid ele­ ments (111), so that they can translate only laterally,while the doors (12) of the second group (12) are connected by an articulated parallelogram (6) which allows the respec­ tive doors (12) besides to be translated laterally also to be shifted frontwards and to position them in such a way as to permit reciprocal side displacements of adjacent doors to be effected. Respective longitudinal guide elements (5i-5s) are fixed to the lower and upper sides of a first group of doors, which elements terminate at their ends with inclined portions (51) co-operating with sliding elements (9i-9s) fixed to the ends of the lower and upper sides of adjacent doors, for shifting outwardly the same when the preceding doors are la­ terally pushed, the doors (12) of the second group being also rigidly connected by a sliding unit (7) to a third group of longitudinal guide members (41i-41s), provided with an arcua­ te portion (8) in correspondence of each door (12), which portion is projected rearwards and at its vertex part the sli­ ding unit (7) is positioned when the respective door (12) is moved in its closed position, and guides the displacement of the latter toward the front rectilinear part thereof. The doors (12) of the second group may be moved outwards both by pulling the same in such direction and by sliding one of the adjacent doors (11) towards them. Finally, all the doors are connected at a rest position the­ reof to the front ends of the respective lower connecting ele­ ments (111i-6i), slidably joined to the respective lower lon­ gitudinal guide members (21i-31i) and connected at the upper position thereof to the corresponding longitudinal guide mem­ bers (21s-31s), slidably guided only therein, so as to be a­ ble to avoid the vertical strains, and the doors (11) of the first group may also be constituted by bellows-like doors or doors of other kind.

Description: The present invention relates to a new device which can be utilized with sliding doors or the like, particularly sliding doors of furnitures, which device is able to permit a coplanarity of the doors at a closed position thereof to be obtained. From CH-A-182913 is known a guiding device for sliding doors which are coplanar at their closed position and comprise two groups of sliding doors disposed alternately to each other, which doors are supported at their lower and upper ends respectively onto a first and a second group of parallel and longitudinal rectilinear guide members fitted in the front part of the correspondent lower and upper side of a furniture, a first group of sliding doors being connected to a respective first group of guide members by rigid connecting elements engaging the same with respective sliding elements and a second group of sliding doors being connected to a respective second group of guide members by connecting elements formed by respective articulated parallelograms engaging slidingly the same with respective sliding elements, thus being able besides to translate laterally also to shift towards the rear side thereof, so as to be positioned in such a manner as to allow reciprocal side displacements of doors adjacent to each other to be effected, wherein correspondent longitudinal guide elements are also connected to the lower and upper sides of a first group of doors, which elements terminate at their one end with inclined portions co-operating with respective sliding elements connected to the ends of the lower and upper sides of the second group of doors, adjacent thereto, for shifting the latter rearwards when the doors of the other groups are operated to be translated laterally. The present invention relates to a guiding device of the kind referred to, which is obtained in such a manner as to provide for an effective braking and dampening action of the movements of the doors according to CH-A-182913, thus preventing any possible damage of the same doors and of the furniture, caused by the impact of the inclined portions of the one door with the sliding elements of the doors adjacent thereto as well as of each door with the furniture structure. The guiding device referred to is disclosed by the characterizing part of claim 1. In order to understand better the features and advantages attainable by the device referred to, the whole will be hereinafter described more in detail, by may of a not limitative example only, and with reference to the attached drawings in which: fig. 1,2 and 3 illustrate schematically and synthetically the device referred to and the operation mode thereof; fig. 4 shows an elevational view of a possible embodiment of the upper part of such device; fig. 5 shows a view cut along the line I-I of the subsequent fig. 7 of a possible embodiment of the lower part of the same device; fig. 6 and 7 show further items of the same embodiment, in views cut respectively along line II-II of fig. 4 and line III-III of fig. 5. In such figures, the items in common are marked with the same numerical references. Moreover, in the fig. 1,2 and 3 the sliding doors are illustrated by a generic transversal section thereof and a sole group of guide members is indicated schematically, which guide members are provided with relative kinematic motion devices to connect and control the doors. Obviously, the illustrated schema will be in practice performed both on the lower and upper side of the furniture (or the like), so that the elements which in such figures are marked with a numerical reference in the practical embodiment thereof, illustrated by the subsequent figures, if pertaining either to the lower or upper side are indicated, whether and when requested, with the same numerical reference followed respectively by the literal reference "i" or "s". It is also pointed out that in such schema the sliding guide members of the doors are disposed on the side which is to be considered inside the furniture. Therefore, with reference to such figures 1,2 and 3, there are noted: a first group of doors 11 which are connected to a first rectilinear longitudinal guide member 21 through a pair of rigid elements 111, extended from the rear side thereof (inner side of the furniture), which slidably engage said first rectilinear longitudinal guide member 21 by means of adequate sliding elements 112, and a second group of doors 12 which are corrected to a second rectilinear longitudinal guide member 31, parallel to the previous one 21, by means of an articulated parallelogram 6 (which is described hereinafter more in detail), which is disposed on the rear side thereof and slidably engages said second rectilinear longitudinal guide member 31 by means of suitable sliding elements 121 and which are also connected to a third longitudinal guide member 41 by means of a rigid arm 70, extended from the rear central side of said doors 12 and slidably engaging said third longitudinal guide member 41 by means of a suitable sliding unit 7. Said third longitudinal guide member 41 is substantially constituted by a longitudinal element disposed parallel to the other guide members (21-31) and provided, in correspondence of the vertical axis of the correspondent doors 12, with an arcuate portion 8 projected towards the rear side thereof, in such a way as to generate a projection rather greater than the thickness of the doors (11-12). More precisely, such arcuate portion 8 comprises two short rectilinear side portions 81 simmetrically converging toward the doors rear side, which portions are joined together at their vertex and are joined with adequate radiate parts at the respective zones of connection to the longitudinal element of the guide member (41). More in detail, as it is clearly noticed from the figures referred to, said articulated parallelogram 6 is constituted by two arms 61 identical each other, forming two of its parallel sides, which arms are pivoted at their ends with the pivots 611 to the respective door 12, at the one side thereof, and with the pivots 612 to a longitudinal bar 62, at the other side thereof, which form the two other equal and parallel sides thereof. Said pivots 612 situated at the ends of said longitudinal bar 62 are disposed onto the respective sliding elements 121 which, as already described, engage said second rectilinear longitudinal guide member 31. Besides, said sliding unit 7 is constituted by a first roll 71 and a second roll 72 pivoted onto an arm 73, which in turn is pivoted onto the free end of the rigid arm 70, coaxially to said first roll 71, said first roll 71 being arranged near the rear wall 411 of said third guide member 41, at the inner side thereof, and said second roll 72, on the contrary, being arranged near the same rear wall, at the outer side thereof. For the reasons set forth below, the arm 73 is maintained removably positioned backwardly, aligned with the axis of the rigid arm 70, by means of a suitable elastic element such as a metallic spring or the like, which for simplicity isn't indicated neither in the first three figures referred to nor in the following ones. Finally, longitudinal guide elements are connected to the upper and lower sides of the doors 11, which elements are marked with the sole reference 5 in the figures referred to, since in such figures it is indicated, as already stated, a generic schema valid both for the lower and upper part thereof. Such longitudinal guide elements 5 are provided with a rectilinear portion 50, extended up to near the ends of the respective sides of the doors and terminating with two inclined portions 51, which are adequately connected to such rectilinear portion 50 and two short rectilinear projections 52 extended outwardly parallel thereto, such rectilinear projections being spaced apart from said rectilinear portion 50 from a distance little greater than the thickness of the doors (11-12). On the contrary, sliding elements 9 are fitted onto the inner (back) side of the doors 12, in correspondence of the ends of the upper and lower sides of each door 12, which elements are formed for instance, as indicated in the figures referred to, by adequate rolls which, when the doors 11 and 12 are disposed in the closed position thereof, aligned coplanar each other, engage correspondent joining portions provided between said projections 52 and the relevant inclined portions 51 thereof. The above described device operates as follows. Firstly, it is pointed out that it is possible to act indifferently onto any door, both of the first group (11) and the second group (12). Fig. 2 clearly illustrates the opening operation of a door 12 of the second group of doors, and reference is hereinafter made to this figure in order to describe in detail such operation. At the beginning, the door 12 referred to is disposed,as illustrated by fig. 1, aligned coplanar with the other ones and in such position the rolls 71-72 of said sliding unit 7 situated at the end of the rigid arm 70 are positioned at the vertex of the arcuate portion 8. Such door 12 can be opened by pulling it outwardly while pushing it contemporaneously laterally in the desired direction. In the case illustrated by the fig. 2 referred to, the door 12 is pushed rightwards. Such actuation makes it possible said first roll 71 of said sliding unit 7 to be shifted towards the right rectilinear portion 81 of said arcuate portion 8 and to slide afterwards therealong, until to become positioned at the beginning of the correspondent rectilinear portion of the relative guide member 41. At the same time, the roll 9 situated at the right side of the door 12 referred to slidably engages the left side end 51 of the guide member 5 fitted to the correspondent right side door 11, which has the same shape of the correspondent portion of said arcuate portion 8 onto which said first roll 71 is sliding, until such roll is positioned at the beginning of the rectilinear portion 50 of said guide member 5. When said first roll 71 is positioned on the inner side of said arcuate portion 8, it could freely slide in each direction, since it cannot be guided by an eventual front wall parallel to the wall forming such arcuate portion 8. Thus, the arrangement as described of said second roll 72 makes it possible that the part of the rear wall 411 of the third guide member 41, which forms the arcuate portion 8, is always comprised between the same roll 72 and said first roll 71, so that this latter is forced to follow exactly the path defined by such wall. It is pointed out that during the sliding movement of the relevant sliding unit 7 along the arcuate portion 8, the arm 73 positiones it automatically perpendicularly to the wall forming such arcuate portion 8 and can freely rotate coaxially to said first roll 71. In addition, the action of the spring (which isn't indicated in the various figures) which, as already stated, tends to maintain said arm 73 aligned with the axis of the rigid arm 70, causes a steady adherence of both rolls 71-72 onto the wall forming said arcuate portion 8, which adherence besides to ensure a precise translation thereof in this part, determines, particularly during the final closing step of the door, an appropriate braking action of the movement by means of a dampening action which is fully effective though soft. Moreover, the movement of the door 12 referred to is guided in this first part, besides to the right side half-portion of said arcuate portion 8 and the inclined portion 51 of the left side end of the guide element 5 fitted to the door 11 adjacent thereto, also by the articulated parallelogram 6 which maintains the door 12 referred to steadily parallel to the plane of the other doors (11-12). At the end of this starting displacement,the door 12 is thus disposed outwardly parallel to and rather separated from the other ones. In fact, the right roll 9 thereof is separated (as it can be seen from fig. 2) from the surface of the rectilinear portion 50 of the guide element 5 of the door 11 adjacent thereto and at this point by pushing the door 12 rightwardly again this door can freely continue to translate laterally, being slidably supported by the arms 61 of the relative parallelogram 6 and being guided by the sliding elements 121 onto the respective guide member 31, which elements are disposed at the ends of the longitudinal bar 62 of said parallelogram 6, until this door is completely situated above the side door 11. Thus, a complete opening and therefore accessibility of the furniture room has been attained, which room was previously closed by the same door 12. In addition, it is pointed out that at the end of the starting displacement, the door 12 referred to can be maintained still in the reached position and under these conditions both the side doors 11 (both the right and left door) can freely slide, if pushed in an adequate manner, towards such door 12 and therefore arrange them at the inner side thereof, so that to obtain the opening and thence the accessibility of the respective rooms of the furniture, which become closed by the same doors. Moreover, also a sole door 11 of said first group of doors can be directly opened, simply by pushing one of these doors laterally against a correspondent door 12 of the second group of doors, as clearly illustrated by fig. 3 to which reference is made hereinafter. In this case, the door 11 referred to is pushed rightwards so that it is shifted in this direction, while sliding with the relative sliding elements 112 thereof onto the respective longitudinal guide member 21. As soon as the translation thereof has commenced, the surface of the right-side inclined portion 51 of its guide element 5 bears against the correspondent left-side sliding element (roll) 9 of the door 12 adjacent thereto, so that this latter in turn tends to be shifted rightwards and in this way the other right-side slide element (roll) 9 thereof bears against the surface of the left-side inclined portion 51 of the guide element 5 of the next door 11 and at the same time also the rigid arm 70 is shifted in the same manner. Thus, it appears evident, by examining the figure referred to, that the door 12 acts practically as a wedge comprised between two inclined planes constituted by the two inclined portion: 51 of the two side doors 11. With respect to similar systems which however use a sole inclined plane (or other element), such shape permits to obtain a considerable global angle of actuation with two limited angles of actuation, which fact makes it possible to control the movement outwardly of the door 12, by acting with a very limited side thrust against the door 11 in such a manner that the global actuation thereof is very easy and useful. In addition, the starting displacements of the doors 12 take place along a trajectory forming also a reduced angle with respect to the line orthogonal to the plane of the doors (11-12), which fact avoid the need to provide the side edges of the same doors with wide bevels, required for the operation thereof, which bevels are antifunctional and also considerably antiaesthetical. At this purpose, it is pointed out that with the solution referred to the sole doors 12, i.e. the doors which besides translating laterally are moved outwardly, require as noticed from the fig. 1,2,3,4 and 5, that their side edges be beveled convergently inwardly with two bevels inclined of an angle practically equal to the angle of said inclined portions 51. Moreover, the outer edges of both the doors 11 and the doors 12 in practice may be brought very closer (in theory at the limit they could be also adjacent each other). By continuing it translation rightwards, the door 11 referred to constrains the two sliding elements (rolls) 9 of the door 12 adjacent thereto to slide onto the respective inclined portions 51 of the guide members 5 fitted to the same door 11 and to the following door 11, and consequently the door 12 is pushed outwardly while sliding contemporaneously rightwards, since it is constraint to proceed along the trajectory determined by the inclined portion 51 of the following door 11, which remains still. As in the previous case, the movement of the door 12 is also guided by the articulated parallelogram 6 which maintains such door 12 parallel to the plane of the other doors (11-12), as well as by the sliding unit 7 which is sliding onto the right side of the arcuate portion 8. The outwardly movement of the door 12 is stopped, when its left-side sliding element (roll) 9 arrives at the front end of the right-side inclined portion 51 of the guide member 5 fitted to the door 11 being operated in its opened position, since when is arrived in this position this element can slide along the rectilinear portion 50 of such guide member 5 without being additionally pushed frontwards. It is to point out that at this position the sliding unit 7 is disposed with its roll 71 again positioned against the right-side of the arcuate portion 8, near the position in which the latter is joined to the subsequent rectilinear longitudinal portion of the guide member 41, so as the rigid arm 70 thereof is prevented from continuing its side translation and consequently also the respective door 12 to which it is connected is stopped and cannot be entrained by the sliding movement of the door 11 being opened, which latter door therefore will be disposed behind the door 12. Besides, it is pointed out that, always at this position, as clearly evident from figures 2 and 3, the door 12 is positioned in front of the other doors (11-12), at a smaller distance than that of the previous case, in practice at a distance just enough to allow the door 11 referred to and the other (righ-side) door 11 to slide behind it, which latter door can be actuated in its opened position and freely slide leftwards behind said door 12, instead of the door 11 which initially was considered actuated in its opened position. Besides, it is pointed out that the rigid elements 111 which connect the doors 11 to the first longitudinal guide member 21 are disposed at a sliding plane different than that of the arms 61 of the articulated parallelograms 6 which connect the doors 12 to the second longitudinal guide member 31 and of the correspondent rigid arm 70 which connects such doors to the third guide member 41. More precisely, the rigid elements 111 are disposed at a sliding plane which is positioned inside that of the arms 61, so as to avoid intersections thereof during the reciprocal side translation movements. Thus, now that the device referred to and the operation mode thereof has been schematically described,it is hereinafter described a possible embodiment thereof, with reference to the subsequent figures 4,5,6 and 7. As already stated, the various elements illustrated by such figures in their practical embodiment, which are equivalent to the correspondent elements which have been indicated schematically by the fig. 1,2 and 3, are marked with the same numerical references, which are distinguished, as already stated, and when requested, by the literal references "i" and "s" in order to indicate the belongings thereof to unit disposed either on the lower side or upper side of the furniture. It is also pointed out that for clearness reasons, while fig. 4 and 5 illustrate the arrangement of the device corresponding to that one fig. 1, in which the doors 11 and 12 are positioned coplanar aligned each other and therefore in their closed position, in the following figures 6 an 7 it is illustrated in the position corresponding to that one of fig. 2, in which the door 12 is displaced outwardly. Moreover, in the fig. 4 and 5 the are indicated with a dashed line and a point-outline line the positions of the doors 12 and the relative elements of the device which are equivalent to those ones respectively illustrated in the fig.3 and 2. Therefore, by examining the fig. 6 and 7, it is firstly noted that the longitudinal guide members 21, 31 and 41 are obtained from a section 1 for the lower side thereof and a section 2 for the upper side thereof. As it may be particularly seen from the fig. 7, the section 1 is formed by a tubular element provided with a rectangular cross-section, whose front wall PA is centrally crossed by a longitudinal slit F1, while a grooved element G3 with a rectangular cross-section is provided below said slit F1, at the inner part of the rear wall PP thereof, which element is open in its upper side and practically forms the third guide member 41 i. Besides, two grooved longitudinal elements SI and SS both provided with half-cylindric grooves, are provided at the inner part of said front wall PA, along the upper edge of said slit F1 and at the lower wall PI thereof. Thus, as it may be particularly seen from fig. 7 and hereinafter described more in detail, the two other guide members 21i and 31i are constituted respectively by the upper side and the lower side of the section 1. As pointed out from fig. 6, the section 2 is simply formed by a base plate PB from which four vertical walls PV extend vertically upwardly, which walls form three grooves constituting practically the three longitudinal guide members 21s, 31s and 41s. As pointed out from fig. 4 and 5, it is noticed that in correspondence of the vertical axis of the doors 12, from the rear walls 411i and 411s of the longitudinal guide members 41i and 41s there are provided arcuate portions 8i and 8s, which are protruding rearwardly therefrom and which can be obtained as separately made elements, adequately fitted to such guide members 41i and 41s. Also, it is noted that the arcuate portion 8s of the upper guide member 41s forms a continuous part together with the relative rear wall 411s thereof, while the arcuate portion 8i of the lower guide member 41i terminates, for the reasons set forth below, at the ends of the joining zones of its side ends, where the relevant rear wall 411i is broken off for short portions 411b and also forms, at the side ends thereof, two folded ports 411a which are appropriately inclined convergently outwards. As particularly pointed out from fig. 6 and 7, the sections 1 and 2 are fitted respectively to the front lower part and front upper part of the furniture, and more precisely the section 1 is arranged between the bottom shelf R and the board Z thereof and the section 2 is fitted to the upper part of the cover C, and such sections are both disposed with their front parts coplanar to the front surface of said furniture. Still examining the fig. 4,5,6 and 7, there are noted the doors 11 and 12 which, as it will be described later, are connected to the sections 1 and 2 referred to so as to form the scheme of the preceding figures 1,2 and 3. The doors 11 are respectively provided, at their lower and upper sides, with two plates so shaped as to form two respective longitudinal guide members 5i and 5s, forming a raised edge extended along the front part thereof with a rectilinear portion 501 and 50s and terminating at the ends thereof with inclined portions 51i and 51s, joined to such rectilinear portions and two short projections 52i and 52s, spaced apart little more than the thickness of the same doors 11 from the respective front portion 50i and 50s. The plates forming said lower longitudinal guide members 5i terminate at their rear side with an upwardly orthogonally bent wing 53, to which there are connected the studs 54, near the ends thereof, which studs are passing orthogonally thereto and are provided at their ends with rolls 55 and 56, thus forming two trucks which provide for said sliding elements 112 of the previous schematic pictures, at the lower side thereof. The front roll 55 has a semicylindrical circumferential shape, so as to be able to engage slidingly the correspondent semicylindrical groove of the grooved longitudinal element SS while being also guided therealong and,on the contrary, the rear roll 56 has a cylindrical shape so as to be able to engage slidingly the inner surface of the upper wall PS of the section 1, as it will be described later. As pointed out from fig. 7, the trucks formed by the rolls 55-56 are disposed at the inner side of the section 1 and the plates forming the lower longitudinal guide members 5i are passing through said longitudinal slit F1, and project outside the same section 1 with a suitable portion, at the end of which the angles 57i are connected, near the ends of which two short pins 58 with rounded head are connected. On the contrary, the plates forming the upper longitudinal guide members 5s have a profile specular with respect to that one of the lower guide members 5i and terminate at their rear side without any bent wing as well as are connected to an angle 57s, whose vertical and downward turned wing in turn is connected to the rear part of the relative door 11. In addition, two downward turned rolls 59 engaging the longitudinal guide member 21s are pivoted at the lower part and near the ends of such upper longitudinal guide members 5s. Also in such case, the rolls 59 provide for the sliding elements 112 of the previous schematic pictures, at the upper side thereof. Finally, the door 11 is provided with dead holes 19 at its lower side, in correspondence of said pins 58, into which holes such pins 58 may penetrate so as to form a particular removable connection which, as described later, permits to obtain particular functional advantages. In fact, from what it has been described it appears evident that the plate forming said guide member 5 as well as the element for connecting thereof to the trucks formed by the rolls 55-56, substantially provides a cantilever supported at one end thereof by such trucks and loaded at the other (external) end thereof by the concentrated load constituted by the weight of the door 11. It follows that a moment is originated, which makes it possible that the roll 55 be pushed downward,against the relevant grooved element SS and the roll 56 be pushed upward against the inner surface of the upper wall of the section 1. Therefore, the door 11 rests only with its lower side onto the front end of the above mentioned plate and is guided only at its upper part by the rolls 59 which are sliding in the cavity of the first upper guide member 21s, so that the connection obtained in the described manner by means of the engagement of the pins 58 into the holes 19 of the same door 11, which practically provides for a hinge junction, doesn't allow that no straining moment be determined on the panel constituting such door 11. Thus, the door 11 will remain perfectly plane and it isn't needed the use of any device providing a re-alignment thereof. Finally, at their lower part the doors 12 are supported in the same manner of the doors 11 by an angle 67, provided with pins 68 engaging the holes 69 of the same doors 12, such elements being fully identical to the equivalent section 57i, pins 58, holes 19 of the doors 11. On the contrary,at their upper part the doors 12 are connected to the vertical flange 91 provided on the front part of a plate 90, extended horizontally over the section 2 constituting the upper group of guide members 21s, 31s, 41s and connected to the guide members 31s and 41s, as described hereinafter. Two vertical studs 611i are connected to the lower part of the horizontal flange of said angle 67, which studs engage the front end portions of two arms 61i, whose other end portions on the contrary are pivoted on the vertical studs 612i, provided at the ends of a longitudinal bar 62i, so determining the lower articulated parallelogram 6i. Moreover, each of such vertical studs 612i is crossed orthogonally, near its lower end, by a further horizontal stud 64, at the ends of which a front roll 65 and a rear roll 66 are connected, which, as clearly evident from fig. 7, are substantially equal to the stud 54 and the relative rolls 55 and 56 thereof and form a truck which is sliding on the lower part of the section 1, constituting practically the longitudinal guide member 21i. In this case, practically, the arms 61i form the elements supporting the door and also in this case such elements provide substantially cantilevers, which are built in on said vertical studs 612. The concentrated load originated by the weight of the door 12 and determined at the front end of said arms 61i, produces a moment which makes it possible that the front roll 65 be pushed downward in the groove of the grooved element SI and the rear roll 66 be pushed upward against the lower surface of the grooved element G3. The connection of the upper part of the door 12 to the relevant upper guide members thereof is obtained in the following way. At the lower part of the plate 90 two arms 61s are pivoted at one end thereof, which arms are then pivoted with the studs 612s, at the other end thereof, at the ends of a longitudinal bar 62s, coaxially to two rolls 121s engaging the rectilinear longitudinal guide member 31s, so obtaining the upper articulated parallelogram 6s. In addition, always at the lower part of said plate 90 an arm 73s is pivoted at a central part thereof, near its rear edge, which arm 73s is coaxial to a first roll 71s engaging the respective guide member 41s, and at the free end of which a second roll 72s is finally pivoted, so obtaining the upper sliding group 7s which engages, as already described, the rear wall 411s of the upper guide member 41s provided with correspondent arcuate portions 8s whose functions have been already described. In this case, said plate 90 also has the functions of the rigid arm 70. On the contrary, at the lower part thereof such functions are performed by a rigid arm 70i, projected toward the rear side of said angle 67 and at the free end of which a first roll 71i is pivoted, which roll engages the respective guide member 41i, as well as by an arm 73i at the free end of which a second roll 72i is pivoted. Thus, the lower sliding group 7i is obtained, which group also in this case engages the rear wall 411i of the lower guide member 41i, provided also with arcuate portions 8i performing the already described functions. It is pointed out that, at the lower part thereof, the elements connecting the door 12 to the respective guide members 21i, 31i and 41i pass through the longitudinal slit F1 provided at the front wall PA of the section P1 and are arranged reciprocally so as they cannot intersect among them when the doors 11 and 12 are moved with translation movements. Besides, as already stated and pointed out from fig. 5, at the ends of said arcuate portion 8i the rear wall 411i of said guide member 41i is broken off by two short portions 411b, at the side ends of which two ourtwardly convergently inclined lips 411a are provided, and at the rear wall PP of the section 1 a slit F2 is provided and extended on the upper side of such arcuate portion, up to the side ends of said portions 411b and permitting the arm 73i to pass therethrough, such an arrangement being requested in order to avoid a continuous longitudinal slit which would divide in two parts said section 1. The operation obtained by such an arrangement is therefore described hereinafter. At the starting position in which the door 12 is closed and therefore aligned coplanar with the other doors (see fig.5), the rigid arm 70 is positioned coaxial to the arcuate portion 8i and the arm 73i too is disposed aligned coaxial thereto as well as turned toward the rear side thereof due to the action of a spring (not shown), fitted between the same and said rigid arm 70. Thus, the first roll 71i is positioned on the inner side of the vertex part of,said arcuate portion 8i and the second roll 72i is positioned on the outer side thereof. When the door 12 is shifted leftwards, the rolls 71i and 72i are sliding along the left-side part of the arcuate portion 8i and arrive at the end thereof, where initiates the broken portion 411b (position X1). By pursuing the displacement of the door 12, the second roll 72i abuts firstly against the correspondent left-side lip 411a (position X2), so that the arm 73i begins to rotate about its pivotal point, and still pursuing in this displacement said roll arrange itself finally, when the rolls 71i and 72i are both penetrated in the rectilinear part of the guide member 41s (position X3), aligned with the same guide member and then positioned orthogonal to the rigid arm 70i. The opposite movement of the door causes at first the second roll 72i to leave the broken portion 411b, which roll is biased by said spring and is sliding on the lip 411a, thus permitting the arm 73i to rotate in an opposite direction. Thereafter, the rolls 71i and 72i re-arrange them respectively at the inner and outer side of the wall forming said arcuate portion 8i while sliding therealong, up to be stopped at the vertex part thereof (position X1). The three positions X1,X2 and X3 of the rigid arm 70i and the rolls 71i - 72i are clearly illustrated by fig. 5. Obviously, when the door 12 is shifted rightwards it is obtained a symmetrical identical operation. The described device is provided also with two rolls 9i, pivoted on correspondent ears 91i extended from the inner side of the ends of the angles 67 and two rolls 9s, pivoted accordingly at the same position on said plate 90. Such rolls 9i and 9s are so fitted as to be positioned on the part connecting the inclined portions. 51i and 51s to the respective rectilinear projections 52i and 52s of the longitudinal guide elements 5i and 5s of the doors 11, when the doors 11 and 12 are disposed in their closed position, aligned coplanar between them. In this way, it is ended the detailed description of the particular embodiment of the device referred to, which embodiment has been illustrated by the fig. 4,5,6 and 7 to which reference has been made, and obviously the operation thereof is that which was previously specified by the schematic description thereof. From what described, it appears evident that the device according to the present invention presents particular advantageous possibilities. In fact, by utilising such device the doors may be translated in opposite directions, which fact is usually impossible to be done with the known devices. In addition, the doors 11 instead of being formed by a single panel can be also of the "bellows" kind, each constituted by two vertical panels hinged together and supported at their side ends by adequate elements (trucks), which are sliding in the relevant longitudinal guide members 21i - 21s, and finally, it is also possible to use not coplanar sliding doors. By concluding, it is to point out that the device referred to is more rational, simple and cheaper with respect to the known devices used for obtaining the same purposes thereof, Moreover, such new device avoids the considerable drawbacks which are normally determined is similar embodiment; in fact, its operation mode besides to be simple requires very limited strains for causing the opening and closing of the doors. Finally, at the end step of closing the doors, which besides to translate are shifted outwards, the same doors return in position in a very soft and automatically dampened manner, so that no other particular braking devices are needed. It is well understood that different modifications may be brought to the device referred to, however anyway without departing from what it has been described and hereinafter claimed, with reference to the attached drawings and therefore from the protection field of the Present industrial invention.

Claims: 1) Guiding device for sliding doors which are coplanar at their closed position, comprising two groups of sliding doors (11-12) disposed alternately to each other and supported at their lower and upper ends respectively onto a first and a second group of parallel and longitudinal rectilinear guide members (21i-21s;31i-31s), which are disposed in the front part of the correspondent lower and upper sides of a furniture, a first group (11) of sliding doors being connected to a respective first group of guide members (21i-21s) by rigid connecting elements (111i-111s) engaging the same with respective sliding elements (112i-112s) and a second group (12) of sliding doors being connected to a respective second group of guide members (31i-31s) by connecting elements formed by respective articulated parallelograms (6i-6s) engaging slidingly the same with reference sliding elements (121i-121s), thus being able besides to translate laterally also to shift in a perpendicular direction thereto, so as to be positioned in such a manner as to allow reciprocal side displacements of doors (11-12) adjacent to each other to be effected, wherein correspondent longitudinal guide elements (5i-5s) are also connected to the lower and upper sides of a first group of doors (11 or 12), which elements terminate at their ends with inclined portions (51), co-operating with respective sliding elements (9i-9s) connected to the ends of the lower and upper sides of a second group of doors (12 or 11) adjacent thereto, for shifting the latter outwards when the doors of the other group are operated to be translated laterally, characterized in that: the sliding doors of the second group shift towards their front side and in that said guiding device further comprises a third group of longitudinal guide members (41i-41s) adjacent and parallel to the other ones (21i-21s;31i-31s), to which the doors (12) of said second group are also connected by a rigid element (70i-70s) engaging the same with a relative sliding unit (7i-7s), the longitudinal guide members (41i-41s) of said third group of guide members being provided in correspondence of each door (12) of said second group with at least an arcuate portion (8i-8s) projected rearwards, at the vertex part of which said sliding unit (7i-7s) is positioned when the correspondent door (12) is closed and then determines the displacement thereof outwards at its rectilinear parts, the doors (11 and 12) being also all supported at a rest position thereof by said respective lower connecting elements (111i-6i), slidably joined into the respective lower longitudinal guide members (21i-31i) and connected at their upper part to the respective upper longitudinal guide members (21s-31s), in which they are slidingly guided and, finally, the doors (11) of the first group could be constituted also by different elements such as bellows-like doors. 2) Device according to claim 1, characterized in that said sliding unit (7i-7s) of said rigid element (70i-70s) is constituted by a first roll (71i-71s) and a second roll (72i-72s) disposed on a relevant arm (73i-73s), articulated at one end thereof coaxial to said first roll (71i-71s), said first and second rolls (71i-71s;72i-72s) being arranged adjacent to the respective inner and outer surfaces of the rear wall (411i-411s) of the respective guide members (41i-41s), and a suitable elastic element being also provided, which element is able to maintain said arm (73i-73s) disposed orthogonal to the doors sliding plane. 3) Device according to claims 1 and 2, characterized in that said articulated parallelograms (6i-6s) are constituted by a pair of arms (61i-61s) equal to each other and pivoted at their one end to a suitable rigid element (67-90), extended respectively from the lower and upper ends of a respective door (12) of said second group and pivoted at the other end thereof to the ends of a longitudinal bar (62i-62s), the distance between the studs (612i-612s) situated at the end portions of said longitudinal bar (62i-62s) being identical to the distance between said studs (611i-611s) connected to said rigid element (67-90). 4) Device according to claim 1, characterised in that the lower sides of all the doors (11-12) at a rest position thereof engage the free front ends of the respective lower connecting elements (111i-6i), whose corresponding lower sliding elements (112i-121i) engage the respective lower longitudinal guide members (21i-31i), thus obtaining a slidable joint connection so as said lower connecting elements are equivalent to cantilevers, the upper ends of said doors (11-12) being on the contrary connected to the respective upper guide members (21s-31s), so as to be guided only therein, the resting engagement of the lower side of said doors (11-12) providing a hinged correction able to prevent moments determining vertical strains from being produced on the panels forming the doors (11-12). 5) Device according to claim 1, characterised in that the two groups of lower and upper longitudinal guide members (21i-31i-41i;21s-31s-41s) are constituted each by a respective section (1-2) preferably made by extruding a suitable material. 6) Device according to claims 1 and 5, characterized in that the lower group of lower longitudinal guide members (21i-31i-41i) is constituted by a section (1) having a tubular shape with rectangular cross-section, in which a vertical wall providing in use the front wall (PA) thereof is provided with a longitudinal slit (F1), extended at a central part thereof and able to permit the lower connecting elements (111i-6i-70i) to pass therethrough, which section (1) is provided at its inner part with an upper opened angle element, extended from the rear wall (PP) below said slit (F1) and able to form said third longitudinal guide member (41i) which, in correspondence of the central part of the respective doors (12) of said second group, has an arcuate portion (8i) projected outwards from the rear wall (PP), said rear wall (PP) being also provided with two openings extended for an appropriate portion (411b) thereof laterally to said arcuate portion (8i), at the side ends of which two rearwardly projecting and convergently inclined lips (411a) are provided, and a further slit (F2), permitting said arm (73i) of the relative sliding unit (7i) to pass therethrough, being finally provided at the upper side of said arcuate portion (8i) and relative side openings (411b). 7) Device according to claims 1 and 5 characterized in that the group of upper guide members (21s-31s-41s) is constituted by a section (2) substantially comprising a longitudinal and flat base plate (PB), from which four walls (PV) are orthogonally extended and form three grooves able to determine said upper longitudinal guide members (21s-31s-41s). 8) Device according to claims 1,5,6 and 7, characterized in that said arcuate portions (8i-8s) respectively provided on the third group of longitudinal guide members (43i-43s) are preferably made separately from the respective sections (1 and 2) and adequately fitted thereto.

Inventors: BORTOLUZZI, GUIDO
Applicants: MOLTENI & C. S.P.A.
Application year: 1989
Main classification: E05D15
IPC codes: E05D15