Hidden hinge, in particular for doors and/or wings of furniture items

Abstract: A hinge for doors or for wings of furniture items comprises fastening elements (1, 2) provided with fixed pivot pins (7', 7") and with sliding guides (9', 9"), which can be housed respectively in the thickness of the door (3) and in a corresponding fixed door post (4); arms (5', 5") for connecting the door (3) to the door post (4) connected to the fastening elements (1,2) with their first extremity (6', 6") hinged on the fixed pivot pin (7', 7") of one of the fastening elements (1,2) and with a second extremity (8', 8") engaged in the sliding guide (9", 9') of the other fastening element (2;1); and a joint (10) interposed at the extremities (6', 8', 6", 8") of the arms (5', 5") which pivotingly connects the arms (5', 5") to each other allowing their relative angular mobility. The fastening elements (1, 2) comprise connecting bodies (15', 15") movable relative to each other at least along one direction defined by at least one of three cartesian axes, respective adjusting means (16, 17, 18) being provided thereto. The arms (5', 5") have mutually different lengths at least in correspondence with their first portion (11', 11"), positioned between the respective first extremities (6', 6") and the intermediate joint (10), to allow the opening of the door (3) with the rotation thereof relative to the door post (4), to a condition of parallelism between door (3) and door post (4) and without substantial interposition of space.

Description: The present invention relates to the manufacture of wings of furniture items and doors in general and in particular it pertains to hidden hinges to articulate the wings to the fixed part of the furniture item and more in general the doors to the related door post. These hinges, currently called invisible hinges, are partly contained inside the thickness of the door and partly inside the thickness of the door post and comprise in particular two fastening elements to connect the hinge respectively to the door and to the door post; arms, each of which is connected to the two fastening elements with their first extremity hinged on a fixed pivot pin of one of the fastening elements and with the other extremity engaged in a sliding guide borne by the other fastening element; and lastly a pivot pin, interposed at the extremities of the arms, which connects the arms in mutually pivoting fashion being able to move, remaining parallel to itself, in the opening and closing motion of the door. A hidden hinge of this kind, comprising all the characteristics of the preamble of Claim 1, is for example known from document US 32 09 390 A. In rather complicated and sophisticated hinges of this kind no adjustment in any of three directions in space is permitted to the door with respect to its fixed posh Infact, they are provided with fastening means of the hinge which are articulated exclusively with one another, but fixed in space once applied. In document CH 671 066 A a hinge between a door and a post is shown, which allows rotation along a single bolt. The hinge is not hidden, its fastening elements being located outside the door and the post. The fastening elements are movable relative to each other along a vertical direction which coincides with the axis of the bolt. The relative position of the fastening elements may be adjusted also along two horizontal directions. Furthermore, in known hinges of this kind, the arms are equal in shape and dimensions and are generally perfectly reversible relative to each other. Moreover, the fastening elements contained in the thickness of the wing and of the door post are opposite and mutually aligned. This conformation of the hinges generally determines the impossibility of positioning the door, in the open condition, flush with the door post when this post is provided with an outer finishing cornice. In practice, the distance, measured between the front surface of the post and the plane of the door opened at an angle of 180 degrees, is never sufficient to permit the application of a standard finishing cornice, the thickness of which is always greater than such a distance. Generally, therefore, if, as almost always happens, the cited finishing cornices were to be applied on the exterior of the post, the door would open only partially, at an angle of approximately 90 to 100 degrees, unless hollows are produced in the front part of the post so as to allow the application of the cornice, but thus greatly increasing the number of operations and the time needed for the application itself. The aim of the present invention is to eliminate such drawbacks by means of a hinge so shaped as to allow the wing to position itself, in the open condition, rigorously flush with a door post having a finishing cornice, the hinge being adjustable along the three cartesian axes, thus permitting the adjustment of door verticality and squaring and the recovery of any imperfection in the assembly. In accordance with the invention this aim is reached by a hinge according to claim 1, wherein the arms have mutually different lengths, at least in correspondence with their portion positioned between the respective first extremities and the intermediate articulation pivot pin, to allow the complete rotation of the door relative to the door post up to an angle of 180 degrees, at least until reaching a condition in which the door is positioned parallel to the finishing cornice. The hinge is also provided with adjustment means which allow in particular to adjust the arms along a vertical direction passing through the intermediate pivot pin. If the adjustment means are so devised as to allow also the adjustment of the hinge along two additional horizontal directions orthogonal to each other and to the vertical direction, the hinge according to the invention is also adjustable in all directions in space. The technical features of the invention, according to the aforesaid aims, can clearly be noted from the content of the claims set out below and its advantages shall become more readily apparent in the detailed description that follows, made with reference to the accompanying drawings, which show an embodiment provided purely by way of non limiting example, in which: Figure 1 is a top plan view of a door and of a door post shown in closed condition, provided with hinges according to the invention, and sectioned at the height of one of the hinges with section plane indicated with trace I-I in Figure 4; Figures 2 and 3 are top plan views of the door and of the door post sectioned as in Figure 1 and shown respectively in a partially opened and in a fully opened condition of the door; Figure 4 is an overall view of the hinge sectioned with a vertical plane of trace IV-IV indicated in Figure 1, showing a view of the arms of the hinges not sectioned; Figures 5 and 6 are views of the hinge of Figure 4 sectioned respectively with the planes V-V and VI-VI and shown with some parts removed the better to highlight others; Figure 7 is a view corresponding to Figure 4 showing the hinge in a sample adjustment condition. With reference to the accompanying drawings, the reference number 20 globally indicates a hinge for doors 3, or wings of furniture items, of the type hidden in the thickness of the door 3 and in the thickness of the related fixed door post 4, associated to the frame of the door itself or to the fixed structure of the furniture item. The hinge 20 (figure 1) essentially comprises fastening elements 1 and 2, stably secured to the door 3 and to the door post 4, and two arms 5', 5" which, advantageously articulated to each other and to the fastening elements 1, 2, allow to connect the door 3 pivotingly to the door post 4, as is necessary for the related opening and closing. Elastic return means 19 are positioned between the fastening elements 1, 2 and the two arms 5', 5". In particular, the fastening elements are embodied by corresponding internally hollow bodies 1 and 2, preferably made of metallic material and provided with planar flanges 21 (Figures 4, 5 and 6). The bodies 1, 2 are housed in the thickness of the door 3 and of the door post 4 (Figures 1, 2 and 3) and in the closed condition of the door 3 they are mutually opposite, but not aligned. Each of the bodies 1 and 2 is internally provided with a fixed pivot pin 7', 7" and with a groove, which embodies a sliding guide 9', 9". The pivot pins 7', 7" are oriented parallel to a vertical direction Z. The sliding guides 9', 9" are instead rectilinear and oriented orthogonal to the pivot pins 7', 7". Each arm 5', 5" is connected to both fastening elements 2, 1. More in particular, a first extremity 6', 6" of each ann 5', 5" is hinged on the fixed pivot pin 7', 7" of one of the fastening elements 2, 1, whilst the second extremity 8', 8", which is provided with a shoe 22, is engaged in the sliding guide 9", 9' of the other fastening element 2;1. The two arms 5', 5" are mutually connected in pivoting fashion by a joint 10 situated between the related extremities 6', 8', 6", 8". The arms 5', 5" generally have elongated, globally curvilinear shapes, differing in design and dimensions, devised to allow the door 3 to rotate relative to the door post 4 (Figure 2) between two extreme conditions: in the first whereof, the door 3 is closed and aligned with its own exterior face 13 to the outer finishing cornice 14 applied to the door post 4 (Figure 1); in the second condition the door 3 being instead open and positioned with its own exterior face 13 in contrast with the outer cornice 14 of the post 4 and without substantial interposition of an intermediate empty space (Figure 3). More specifically, defining as first arm portions 11', 11" those parts of the arms 5', 5" that are situated between the first extremities 6', 6" and the intermediate joint 10 and as second arm portions 12', 12" those parts that are instead situated between the intermediate joint 10 and the second extremities 8', 8", one can observe from Figures 1, 2 and 3 that the two arms 5', 5" have mutually different lengths, both in correspondence with their first portions 11', 11", and in correspondence with their second portions 12', 12". Moreover, the portions 11', 11", 12', 12" of said arms 5', 5" are embodied by a succession of segments positioned according to an advantageous broken line which, in the closed condition of the door 3, causes the first portions 11', 11" of the arms 5', 5" to be mutually angled according to a suitable angle alpha, whose amplitude is preferably close to 30°; and the second portions 12', 12" to be oriented, relative to the corresponding first portions, according to an angle beta substantially close to 105°. The hinge 20 is advantageously constructed in such a way as to be also adjustable according to the three spatial directions X, Y, Z and upon the activation of related adjustment means 16, 17, 18. In particular (Figure 7), if the intermediate joint 10 of the arms 5', 5" is embodied by a ball 23 which is contained in a seat 24 of the one of the arms 5" and is contrasted by a first rotating dowel 16 borne by the other arm 5' and oriented parallel to the axis of rotation of the joint 10, the rotation of the dowel 16 effected according to one or the other of the possible directions allows to move the arms 5', 5" closer to or farther away from each other and, consequently, allows to adjust the hinge 20 along the vertical direction Z by means of the relative displacement of the fastening elements 1, 2 integral with the two arms 5', 5". In this particular embodiment, the adjustment means acting according to the vertical direction Z thus appear integrated in the same intermediate joint 10 of the arms 5', 5". In regard to the possibility of adjusting the hinge 20 also along two mutually orthogonal directions, transverse to the vertical direction Z, the embodiment of the invention illustrated in the figures of the accompanying drawings provides in particular for the fastening elements 1, 2 to be constructed in such a way as to comprise: fixed parts embodied by the flanges 21 and movable parts embodied by distinct connecting bodies 15', 15" contained in their inner cavity. The connecting bodies 15', 15", which bear the pivot pins 7', 7" articulating the arms 5', 5", are able slidingly to translate relative to the fixed parts of the fastening elements 1, 2 along respective pairs of guide rods 26, 27 which are oriented along two mutually orthogonal horizontal directions. The adjustment means are in this case embodied in such a way as to comprise a second dowel 17 interposed between one of the connecting bodies 15', 15" and the related fastening element 1;2 and acting along a first horizontal direction X and an eccentric 18 positioned between the other connecting body 15", 15' and the related fastening element 1, 2 and acting according to a direction Y orthogonal to the first.

Claims: A hidden hinge, in particular for doors or for wings of furniture items, comprising fastening elements (1,2), provided with fixed pivot pins (7',7") and with sliding guides (9',9"), which can be housed respectively in the thickness of the door (3) and in the thickness of a corresponding fixed door post (4) and which result to be mutually opposite when the door (3) is in closed condition; arms (5',5") for connecting the door (3) to the door post (4) which are connected to the fastening elements (1,2) respectively with their first extremity (6',6") hinged on the fixed pivot pin (7',7") of one of the fastening elements (1;2) and with a second extremity (8', 8") engaged in the sliding guide (9", 9') of the other fastening element (2;1); and a joint (10) interposed at the extremities (6', 8', 6", 8") of the arms (5', 5") which pivotingly connects the arms (5', 5") to each other allowing their relative angular mobility, characterised in that at least one of the fastening elements (2;1) comprises a fixed part (21) fastened to the respective door post (4) or door (3) and a movable part embodied by a connecting body (15";15') which bears one of the fixed pivot pins (7';7") articulating one of the arms (5';5"), the connecting body (15";15') being housed inside the thickness of the respective door post (4) or door (3) internally relative to the fixed part (21) and being slidingly translatable relative to the fixed part (21) along a first horizontal direction (X) perpendicular to a vertical plane which is intermediate between the two fastening elements (1,2) when the door (3) is in closed condition, so that the two fastening elements (1,2) are movable relative to each other along the first horizontal direction (X), the hidden hinge further comprising adjusting means (16,17,18) to vary the position of at least the connecting body (15";15') at least along the first horizontal direction (X). A hinge, as claimed in claim 1, characterised in that the fastening elements (1,2) are movable relative to each other along a vertical direction (Z) and in that the adjustment means (16,17,18) are devised to effect a positional adjustment of the fastening elements (1,2) along the vertical direction (Z). A hinge, as claimed in claim 2, characterised in that said adjustment means comprise a first dowel (16), able to rotate, situated between the arms (5',5") and oriented parallel to the axis of rotation of the intermediate articulation (10), said dowel (16) allowing to move the arms (5',5") mutually closer or, vice versa, farther away in correspondence with opposite directions of its rotation, at least along the vertical direction (Z). A hinge, as claimed in any of the previous claims, characterized in that also the other of the fastening elements (1;2) comprises a respective fixed part (21), fastened to the respective door (3) or door post (4), and a respective movable part embodied by another connecting body (15';15") which bears the other of the fixed pivot pins (7";7') articulating the other of the arms (5";5'), said other connecting body (15';15") being housed in the thickness of the respective door (3) or door post (4) internally relative to the respective fixed part (21) and being slidingly translatable relative to the respective fixed part (21) along a further horizontal direction (Y) perpendicular to the first horizontal direction (X), so that the two fastening elements (1,2) are movable relative to each other along the further horizontal direction (Y), the adjusting means (16,17,18) being devised to vary the position of the other connecting body (15';15") along the further horizontal direction (Y). A hinge, as claimed in any of the previous claims, characterised in that the adjustment means comprise at least a second dowel (17) interposed between a connecting body (15'; 15") and the related fastening element (1;2) and acting along a direction (X;Y) transverse to the vertical direction (Z). A hinge, as claimed in claim 5, characterised in that the adjustment means comprise an eccentric (18) positioned between a connecting body (15', 15") and a related fastening element (1, 2) and acting along a direction (X;Y) transverse to the vertical direction (Z) to adjust the hinge correspondingly along said direction (X;Y). A hinge, as claimed in any of the previous claims, characterised in that the arms (5', 5") have mutually different lengths at least in correspondence with their first portion (11', 11"), positioned between the respective first extremities (6', 6") and the intermediate joint (10), to allow the opening of the door (3) with the rotation thereof relative to the door post (4), to a condition of parallelism between the door (3) and the door post (4) and without substantial interposition of intermediate empty space. A hinge, as claimed in claim 7, characterised in that said arms (5', 5") have mutually different lengths in correspondence with theirs second portions (12', 12") positioned between the second extremities (8', 8") and the joint (10). A hinge, as claimed in claim 7 or 8, characterised in that the portions (11', 11") or (12', 12") of said arms (5', 5") have elongated shape and comprise a succession of segments arranged according to a broken line. A hinge, as claimed in any of the previous claims from 7 to 9, characterised in that the first portions of the arms (11', 11") are mutually angled according to an appropriate angle alpha. A hinge, as claimed in claim 10, characterised in that the angle alpha has an amplitude substantially close to 30°. A hinge, as claimed in any of the previous claims from 7 to 11, characterised in that the arms (5', 5") are dimensioned and shaped to allow the rotation of the door (3) relative to the door post (4) between two extreme conditions, in one of which the door (3) is closed and aligned with its own exterior face (13) to a finishing cornice (14) applied at the door post (4), in the second condition the door (3) being instead open and positioned with its exterior face (13) in contrast with the cornice (14) of the door post (4). A hinge, as claimed in any of the previous claims, characterised in that it comprises elastic return means (19) positioned between the arms (5', 5") and the fastening elements (1,2). A hinge, as claimed in any of the previous claims, characterized in that the door (3), when in the closed condition, has its own plane perpendicular to the vertical plane, which is intermediate between the two fastening elements (1,2) when the door (3) is in the closed condition, the variation of the position of the connecting body (15";15') of the one of the fastening elements (2;1) along the first horizontal direction (X) producing a movement of the door (3) in its own plane.

Inventors: CALDARI GIANFRANCO, CALDARI, GIANFRANCO
Applicants: KOBLENZ S P A, KOBLENZ S.P.A.
Application year: 2000
Main classification: E05D3
IPC codes: E05D7, E05D3