MXPA97008034A

MXPA97008034A - Extruded hinge members and folding doors formed from mis

Info

Publication number: MXPA97008034A
Application number: MXPA/A/1997/008034A
Authority: MX
Inventors: De Zen Vittorio
Original assignee: Royal Plastics Group Limited
Priority date: 1995-04-18
Filing date: 1997-10-17
Publication date: 1998-02-01

Abstract

Hinge member extrusions (1) for use in the formation of a hinge connection, each member having a front wall (2) and a rear wall (3) and having at one end a receptacle formation generally in the form of C (4), the receptacle formation (4) having a first partially circular edge wall segment (5) extending arcuately inward from the edge of the front wall (2) towards the adjacent rear wall (3) and which is connected thereto and, a second partially circular arm segment (8) connected to one end (8) connected to one end of the first partially circular wall segment (5) by a mesh (9) extending inwardly from the first partially circular wall segment (5), the first and second partially circular segments having a common center (30) with the radius of the internal surface (12) of the first partially circular wall segment (5) being slightly larger than the radius (13) of the external surface (14) of the second partially circular arm segment (8). The two hinge members (1, 1 ') are required in a hinge formation to receive a hinge (24), one of the hinge members (1) has its partially circular arm segment (8) connected to its segment of hinge (1, 1'). partially circular wall (5) at one end adjacent to the rear wall (3). The other (1 ') has its partially circular arm section (8') connected to its partially circular wall segment (5 ') at the end at one edge of the front wall (2). The invention also includes folding doors or the like employing the aforementioned hinge members.

Description

EXTRUDED HINGE MEMBERS AND FOLDING DOORS FORMED FROM THEMSELVES FIELD OF THE INVENTION This invention relates to a novel hinge arrangement particularly adapted for large panels that connect with hinges such as those used in collapsible garage doors and for doors using the novel hinge arrangement.

BACKGROUND OF THE INVENTION Currently, garage doors are usually formed from rows of hinged wood panels joined together by a number of separate metal hinges attached thereto. The doors also have a series of rollers mounted separately at their edges which run in rails that extend up the sides of the door opening and horizontally inward at the top of the door opening in a manner that the door can move upwards and then due to the hinge arrangement it moves horizontally in the upper part of the door opening. Very often the folding of garage doors is provided with a remote control to raise and lower the door in response to a signal from a small transmitting device. Such garage doors are expensive to manufacture from the price of wood and the substantial amount of tools required in the form of hinges and rollers that have to be assembled individually. Also, those doors are heavy and difficult to handle, board and install. The mechanisms that open the garage door to handle such heavy doors require significant torque motors and cables, pulleys or other equipment for relatively heavy work to perform the movement of the door. In addition, current doors require maintenance and painting and when they are damaged, they can not be easily repaired since the panels can not be replaced without the removal and dismantling of the door. It has also been proposed to provide a continuous hinge between two hinge members to form one member as a male member with a projecting hinge and another member as a female member having a receptacle for receiving the hinge. Such provisions are illustrated in the Patents of the States U.S. 4,567,931, 4,532,973 and 2,968,829 do not provide the freedom of movement requirement of the hinge with an adequate connection between the hinge members and the hinge axis is offset to the side of the members.

BRIEF DESCRIPTION OF THE NONDION It is a feature of the present invention to provide a very simple continuous hinge arrangement involving hinge members that can be easily extruded and in particular can be extruded in a very economical way from thermoplastic material, the hinge arrangement being such as to provide freedom of movement of the hinge members between predetermined angular positions insofar as it provides a strong connection between the hinge members that will prevent them from being separated in the operation of very large top folding doors. It is an additional feature to provide such a hinge connection as mentioned above in which the hinge axis is arranged to be on a line forming the midline between the front and rear walls or faces of the hinge members. The present invention also provides a collapsible door such as an upper garage door formed essentially or entirely of plastic material which is significantly less expensive in its manufacture and much lighter than the current doors and does not require any hinge tool to assemble or tool rail on the rails on the sides of the door opening.

The invention also provides that the hinge members and the doors employing them are adapted to be easily assembled so that they can be shipped unarmed and assembled at the point of installation. When forming hinges and plastic panels, the components do not require maintenance and the placement is such that if the door panel is damaged it can be replaced easily and easily without having to remove the door from its installed position or alter the other panels. In addition, due to the light weight of the hinge and the door components, lighter and less expensive door operation equipment can be employed to provide additional cost savings. More particularly, the invention resolves the provision of hinge members in the form of longitudinal extrusions for use in the formation of a hinge connection, the hinge members comprising first and second hinge members each having a wall front and a rear wall and having at one edge a generally C-shaped receptacle formation having two circular segments having a common center and different radii. One of the partially circular segments forms an incoming edge wall segment extending arcuately inward from the edge of the front wall towards the adjacent back wall and connected thereto, and the other partially circular segment comprises a curved arm which part of a circle connected to one end of the partially circular wall segment and curving outwardly beyond the front and rear walls of the member, the radius of the inner surface of the partially circular wall segment being slightly greater than the radius of the outer surface of the partially circular arm segment. The first hinge member has its partially circular arm segment connected to its partially circular wall segment adjacent to its rear wall, while the second member has its partially circular arm segment connected to its partially circular wall segment at its front wall. The arrangement is such that the partially circular arm segment of the first hinge member is adapted to rotate on the partially circular wall segment of the second hinge member and vice versa and, the partially circular arm segments are adapted to form a shaft formation of hinge to receive a hinged hinge for rotational movement around it centered on said common center. The hinge members are also provided with means where a connection can be made so that the panel elements are hinged. In accordance with the preferred form of the invention, the extruded hinge members have parallel front and rear walls and the common center of the circular segments of the C-formations are located on the median between the front and rear walls. The invention also includes folding structures such as the upper doors employing such hinge members for hinged door panels and in accordance with the preferred embodiment of this aspect of the invention, the door panels are secured releasable at the edges. longitudinal of the hinge members opposite the C-shaped edges. According to another aspect of the preferred form of the invention with regard to the doors, the edges of the panels at the edges of the doors are releasably secured to an edge rail or frame member having a barb that is outwardly stretched to provide beak teeth adapted to run in a rail at the edge of the door with the beak teeth being adapted to engage with the momentum of the opening mechanisms of a garage door. These and other features of the invention will be understood from the following detailed description taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DIAMETERS Figure 1 is an extreme elevation view showing the profile of one of the hinge elements which, in a folding upper garage door or the like, forms the upper hinge element; Figure 2 is an elevation view showing the profile of the other hinge element forming the lower hinge element in a folding upper garage door or the like; Figure 3 shows the hinge elements of the assembled Figures 1 and 2 ready to receive a hinge hinge with the front walls of the hinge elements in alignment; Figure 4 illustrates the hinge elements of Figures 1 and 2 rotated about a hinge toward a boundary hinged position; Figures 5, 6 and 7 are exploded perspective views of various hinge shapes; Figure 8 is an exploded sectional view showing the hinge connection of a pair of hinge members and illustrating the manner in which the door panels are removably secured to those hinge members; Figure 9 is an exploded view of a garage door or the like showing the edge frame rails provided with beak teeth at the edges of two rows of hinged door panel; Figure 10 is a diagrammatic perspective view incorporating the assembled invention for sliding and folding engagement in the rails on each side of the door opening (not shown); Figure 11 is a diagrammatic view illustrating how the hinged panels of the door are guided from vertical to horizontal movement in the upper part of the door opening; Figure 12 is a partial exploded elevation view of the front part showing a form of drive mechanism for raising and lowering the folding door.

DETAILED DESCRIPTION OF WITH FORMI DAD WITH THE PREFERED MODALITIES OF THIS I NVENTION It will be understood that the novel hinges of the present invention have wide application due to their simplicity, strength and free hinge action is of particular importance in large hinge structures such as large folding doors, ie large or similar upper garage doors and they will describe with reference to them. With reference to Fig. 1, the hinge member designated at 1 which is for forming the upper hinge member in a folding upper garage door or the like comprises a longitudinal extrusion in the form of a hollow bar having a front wall 2 and a rear wall 3 secured in relation to the separated one. The lower longitudinal edge of the hinge member or bar 1 is formed to present a C-shaped receptacle formation designated 4.

This receptacle formation 4 has this receptacle formation 4 has a first partially circular edge wall segment 5 extending arcuately inward from the edge of the front wall 2 towards the adjacent rear wall 3 to which it is attached by a short mesh 6 which forms an obtuse angle 7 with the rear wall. This wall segment 5 forms an arched recess wall that extends most of the width distance of the hinge member 1. The C-shaped receptacle formation 4 has a second partially circular segment in the shape of a curved arm 8 forming part of a circle connected to the inner end of the wall segment 5 by an internal extension of the mesh 6 forming a shoulder 9 at the junction of the inner end of the wall segment 5 and the beginning of the partially circular arm 8. The partially circular wall segment 5 and the partially circular arm 8 have a common center indicated at 10 which is located on a line forming the median between the front and rear walls 2 and 3. The wall and arm segments 5 and 8 have different radii with the radius 1 1 of the concave inner surface 12 of the partially circular wall segment 5 which is slightly larger than the radius 13 of the convex surface 14 of the partially circular arm segment 8.

The front and rear walls 2 and 3 are connected adjacent the upper edge of the hinge member 1 by a transverse mesh 15 and tilting upward and inward from the front wall 2 is a wall 16 forming a generally triangular peak 17 with a wall of return that extends downwards 18 parallel to the front and rear walls 2 and 3 and offset to the front wall from the median between the front and rear walls. The return wall 18 ends in a shoulder 19 centered on the median of the front and rear walls and connected to the mesh 15 by a wall 20 which with the upper portion 21 of the rear wall 3 forms a channel 22 which is flanged towards in its nozzle to provide a slightly restricted entry 23. The hinge member or bar 1 is adapted to interconnect with a bar or engageable hinge member V which in a top folding door installation is for forming the upper hinge member. The hinge member V as in the case of the hinge member 1 comprises a longitudinal extrusion in the form of a hollow bar having parallel front and rear walls 2 'and 3' respectively and having a designated C-shaped receptacle formation at 4 'which in the case of the hinge bar 1' is formed at the upper edge of the member.

The C-shaped receptacle formation 4 'has a first partially circular edge wall segment 5 * extending inwardly arched from the edge of the front wall 2' towards the adjacent rear wall 3 'which is attached to the same by a 6 'mesh forming an obtuse angle 7' with the rear wall 3 '.

The second segment of the C-shaped formation 4 'of the hinge member 1' again comprises a partially circular arm 8 'which in this case is connected to the front end of the wall segment 5' by a shoulder 9 '. The partially circular wall segment 5 'and the partially circular arm 8' have a common center designated at 10 'which is again located at the median of the front and rear walls 2' and 3 *. As in the case of the hinge member 1, the partially circular wall segment 5 'and the partially circular arm 8' have different radii with the radius 11 'of the inner concave surface 12' of the wall segment 5 'being slightly larger than the radius 13 'of the external convex surface 14' of the partially circular arm segment 8 '. The radius 11 'of the concave surface 12' of the wall segment 5 'of the hinge member 1' is the same as the radius 11 of the concave surface 12 of the wall segment 5 of the hinge member 1. Similarly, the radius 13 'of the external convex surface 14' of the arm segment 8 'of the hinge member 1' is the same as the radius 13 of the external convex surface 14 of the arm segment 8 of the hinge member 1 with the length of the segment of partially circular arm 8 of hinge member 1 being slightly larger than the length of partially circular arm segment 8 'of hinge member 1'. The hinge member 1 'has the same formation at its lower edge as the one having the hinge member 1 at its upper edge with the walls 2' and 3 'being connected by the mesh 15' and having a sloping wall downwards. and inwards 16 'forming a triangular peak 17' with an upwardly extending wall 18 'which is parallel to the front and rear walls 2' and 3 'and on the anterior side of the median of the front walls and after 2 'and 3'. The wall 18 'forms a shoulder 19' with a wall 20 'forming a lower portion 21' of the rear wall 3 'a channel 22' having a restricted entrance 23 '. The hinge members or bars 1 and 1"can easily be extruded and are particularly adapted to be extruded from a suitable plastic material such as PVC, vinyl or ABS or mixtures thereof and can include appropriate fillers or reinforcing agents such as carbonate of calcium as will be understood by those skilled in the art With reference to Figure 3, the hinge members or bars 1 and 1 'are shown interengaged ready to receive a hinged hinge and with its front walls 2 and 2' in alignment. As will be seen, the outer surface of the partially circular arm 8 couples the inner concave surface 12 'of the partially circular wall segment 5' of the hinge member 1 'while the external convex surface 14' of the partially circular arm 8 'couples the surface inner concave 12 of the partially circular wall segment 5 with shoulders 9 and 9 'which prevent the detent surfaces from limiting the forward hinge movement between members 1 and 1'. With the hinge members assembled as illustrated in Figure 3, the centers 10 and 10 'will then coincide. It is understood that the C-shaped and 4 'shaped receptacle formations can be easily assembled within the position shown in Figure 3 although they require the introduction of a hinge hinge 24 as shown in Figure 4 to hold them in place. As shown in Figure 4, the hinge member 1 has been rotated rearwardly of the hinge member 1 'until the meshes 6 and 6' splice which limits the additional hinge movement. In this position, as illustrated in Figure 4, the free end of the partially circular arm 8 essentially connects the inner surface of the shoulder 9 'to the inner end of the partially circular arm 8'. With the illustrated arrangement, the partially circular wall segment 5 and 5 'forms firm support surfaces for supporting and guiding the partially circular arms 8 and 8' in the hinge action while the partially circular arms 8 and 8 'form by Hinge stem elements themselves to receive the hinge pin 24 which has a simple circular cross section and when inserted into the hinge stem formation presented by the arms 8 and 8 'has its center centered on the median of the front and rear walls of the hinge members 1 and 1 '. This combination provides an extremely effective free hinge movement and at the same time provides a hinge capable of resisting the forces tending to separate the hinge members in the operation of a large upper garage door or the like. The hinge hinge 24 can simply be a longitudinal bar of circular section having a diameter to fit snugly within the partially circular arms 8 and 8 'and can be formed either as an extruded bar of high strength plastic material or can be a metal bar. Similarly, the tubular hinge 24a of Figure 6 may be extruded plastic or may be a tubular metal bar. The hinge 24b illustrated in Figure 7 is preferably extruded from high density polyethylene to provide a series of spokes or vanes 25 having only the tips thereof engaging the partially circular arms 8 and 8 '. The hinge 24b provides a minimum of friction and is in effect self-lubricating. Figure 8 illustrates how the panels 26 are removably connected to the hinge elements 1 and 1 'in the formation of an upper garage door or the like. Those panels 26 that are preferably formed of a suitable plastic material such as foamed PVC and can be flat panels or can be vacuum formed to provide any desired decorative design are adapted to seat in the case of the hinge element 1 on the shoulder 19. The panels are held against the wall 18 by a longitudinal extruded hollow bar seal 27 having a lance head 28 adapted to interconnect elastically with the restricted entry 23. Similarly, in the case of the hinge element 1"the panels 26 which they rest on the shoulder 19 'are supported against the retainer wall 20' by a stay bar 27. It will be understood as illustrated in figure 10, that a large garage door or the like is formed of transverse rows of panels 26 while the hinge elements 1 and 1 'extend the full width of the door generally designated at 29. Each of the panels 26 is removably secured to intermediate members 30, upper and lower members 31 and 32 and side rails 33 respectively preferably in the same manner as the panels are secured to the longitudinal edges of the hinge members 1 and 1 '. As illustrated in Figures 9 and 12, the side rails 33 are provided with prongs that are enmeshed to have beak teeth 34 that are adapted to extend within the door rails 35 positioned on either side of the door 29.

These beak teeth 34 are adapted to be coupled by a suitable garage door opening mechanism shown here as a motor driven belt drive generally designated at 36 on each side of the door driven by small synchronous motors 37. As illustrated in Figure 12, each motor 37 drives a band 38 (only one is shown) through a drive sprocket 39 and a drive sprocket 40, the band having projecting peaks 41 that engage the spike teeth 34 of the edge frame bars or side rails 33 and projecting peaks 42 that engage the drive sprockets 39 and 40. As illustrated in Figures 10 and 11, the garage door rails 35 as they curl at 43 from the vertical section 44 to horizontal section 45 are widened to accommodate the movement of beak teeth 34 extending from the edges of side rails 33 through them conform e the door panels 26 pivot one relative to the other. It will be understood that the door panels 26, the hinge members or bars 1 and 1 ', the upper, lower and side rails 31, 32 and 33 respectively formed all of suitable thermoplastic material may contain coloring agents, ultraviolet light protecting agents and similar as will be understood by those skilled in the art. With the hinges constructed in accordance with the invention, it will be appreciated that the invention provides the production of large upper doors which can be single or double garage doors which can be easily and economically manufactured and easily assembled at a much lower cost than garage doors conventional without requiring any of the extensive tools of such doors. In addition, its ability to be assembled in the field and its light weight that allows easy handling, transportation and installation also allows the use of garage opening mechanisms of low torque. It will be understood that variations may be made in the details of the hinge elements and the doors formed therefrom without departing from the scope of the appended claims.

Claims

REIVIN DICACIONES

1. An extruded thermoplastic hinge member (1 or 1 ') for use in the formation of a hinge connection, the member having a front wall (2 or 2') and a rear wall (3 or 3?) And presenting on one edge a generally C-shaped receptacle formation (4 or 4 '), characterized in that the receptacle formation (4 or 4') has a first partially circular edge wall segment (5 or 5 ') which is extends arcuately inward of the edge of the front wall (2 or 2 ') towards the adjacent rear wall (3 or 3') and which is connected thereto and a second partially circular arm segment (8 or 8 ') connected to it. one end of the first partially circular wall segment (5 or 5 ') by a mesh (9 or 9') extending into the first partially circular wall segment (5 or 5 '), said first and second segments partially circular which have a common center (10 or 10 ') with the radii (1 1 or 1 1') of the internal surface of The first partially circular wall segment is slightly larger than the radius (13 or 13 ') of the outer surface of the second partially circular arm segment (8 or 8').

A hinge member as claimed in claim 1, characterized in that the second partially circular arm segment (8) is connected by the mesh (9) towards the end of the first partially circular edge wall segment (5) adjacent to the rear wall (3).

3. A hinge member as claimed in claim 1, characterized in that the second partially circular arm segment (8 ') is connected by the mesh (9') towards the end of the first partially circular edge wall segment (5 '). ) on the front wall (2 '). A hinge member as claimed in claims 1, 2 or 3, characterized in that the inwardly extending mesh (9 or 9 ') forms a retainer shoulder at the junction of the first and second partially circular segments. A hinge member as claimed in claim 1, 2 or 3, characterized in that the first partially circular edge wall segment (5 or 5 ') is connected to the rear wall (3 or 3') by a network (6 or 6 ') that forms an obtuse angle with the posterior wall (3 0 3'). 6. A pair of hinge members extruded from thermoplastic material adapted for partial interengagement for use in the formation of a membrane connection, each of the hinge members having a front wall (2 or 2 ') and a rear wall (3 or 3 ') characterized in that each hinge member has on one edge a generally C-shaped receptacle formation (4, 4') having two partially circular segments (5, 8, or 5 '8') having a common center and different radii, one of the partially circular segments (5 or 5 ') forming an incoming edge wall segment extending arcuately inward from the edge of the front wall (2 or 2' ) towards an adjacent rear wall (3 or 3 ') and that is connected to the rear wall and, the other of the partially circular segments comprising a partially circular arm (8 or 8') connected to one end of the wall segment partially circular (5 or 5 ') and that curves outwardly beyond the front and rear walls, the radius of the inner surface (1 1 or 1 1 ') of the partially circular wall segment (5 or 5') being slightly larger than the radius (13 or 13 ') ) of the outer surface of the partially circular arm segment (8 or 8 '), one of the hinge members (1) having its partially circular arm segment (8) connected to its adjacent partially circular wall segment (5) to its rear wall (3) and the other of the hinge members (1 ') having its circular arm segment (8') connected to its partially circular wall segment (5 ') on its front wall (2') , the positioning being such that the partially circular arm segment (8) of the first hinge member (1 ') is adapted to rotate on the partially circular wall segment (5') of the second hinge member (1 ') and vice versa and the partially circular arm segments (8 and 8 ') are adapted to form a shaft e hinge for receiving a hinge pin for rotational movement around it. 7. Hinge members as claimed in claim 6, characterized in that the front and rear walls (2, 3, 2 '3') are parallel and the common center (10, 10 ') for the circular segments (5, 5', 8, 8 ') is located on a line between the front and rear walls. Hinge members as claimed in claims 6 or 7, characterized in that the partially circular arm segment (8) of the first member (1) is larger than the partially circular arm segment (8 ') of the second member (1 ') . 9. Hinge members as claimed in claims 6, 7 or 8, characterized in that the connections (9, 9 ') between the partially circular segments (5, 5') and the partially circular segments (8, 8 ') ) form retaining bosses. A collapsible garage door or the like comprising a plurality of transverse rows of door panels (26) of plastic material hingedly connected by a plurality of transverse spaced hinges characterized in that each of the transverse hinges comprises a pair of bars of hollow extruded hollow thermoplastic hinge (1, 1 ') each of those hinge rods having a front wall (2, 2') and a rear wall (3, 3 ') and having on one edge a receptacle formation generally in the form of C (4, 4 ') having two partially circular segments (5, 8, or 5' 8 ') having a common center and different radii, one of the partially circular segments (5 or 5') which it forms an incoming edge wall segment extending arcuately inwardly from the edge of the front wall (2 or 2 ') towards an adjacent rear wall (3 or 3') and which is connected to the rear wall and, the other of the segmen partially circular surfaces comprising a partially circular arm (8 or 8 ') connected to one end of the partially circular wall segment (5 or 5') and curving outwardly beyond the front and rear walls, the radius of the internal surface of the partially circular wall segment (5 or 5 ') being slightly larger than the radius of the outer surface of the partially circular arm segment (8 or 8'), one of the hinge bars (1) having its segment of partially circular arm (8) connected to its partially circular wall segment (5) adjacent to its rear wall (3) and the other to the hinge bars (1 ') having its circular arm segment (8') connected to its partially circular wall segment (5 ') on its front wall (2'), the positioning being such that the partially circular arm segment (8) of the hinge bar (1) rotates on the partially circular wall segment (5 ') of the other hinge bar (1') and vice versa and the partially circular arm segments (8 and 8 ') form a hinge shaft and a hinge hinge (24, 24a, 24b) mounted on the hinge shaft, the hinge bars (1, 1') having means extending along the longitudinal edges thereof opposed to the generally C-shaped receptacle formation (4, 4 ') for coupling the door panels. eleven . A garage door as claimed in claim 10, characterized in that the front and rear walls (2, 2 ', 3, 3') are parallel and the common center (10, 10") for the partially circular segments ( 5, 5 ', 8, 8') is located on a line between the front and rear walls 12. A garage door as claimed in claims 10 or 1, characterized in that the partially circular wall segments (5 or 5 ') of the hinge bars (1, 1') are connected to their rear walls (3, 3 ') by meshes (6, 6') forming an obtuse angle with their rear walls. garage as claimed in claims 10, 11 or 12, characterized in that the connections (9, 9 ') between the partially circular segments (5, 5') and the partially circular segments (8, 8 ') of the detent protruding shapes. 14. A garage door as claimed in claims 10, 11 or 12, characterized in that the partially circular arm segment (8) of the hinge bar (1) is longer than the partially circular arm segment. (8 ') of the other hinge bar (1'). 15. A garage door as claimed in claims 10 or 11, characterized in that the edges of the panels (26) at the edges of the door are coupled by edge frame rails (33) that present a series projection tip teeth (34) adapted to extend within a rail (35) in a door opening. 16. A garage door as claimed in claim 1, characterized in that motor means (36) are provided for coupling the tip teeth of the edge frame rails to operate the door to open and close it. A garage door as claimed in claims 10, 11 or 12, characterized in that the hinge is a polyethylene bar (24b) having radially projecting vanes (25) that couple the walls of the hinge shaft (8, 8 ') to provide a self-lubricated hinge. SUMMARY Hinge member extrusions (1) for use in the formation of a hinge connection, each member having a front wall (2) and a rear wall (3) and having at one end a receptacle formation generally in the form of C (4), the receptacle formation (4) having a first partially circular edge wall segment (5) extending arcuately inward from the edge of the front wall (2) towards the adjacent rear wall (3) and which is connected thereto and, a second partially circular arm segment (8) connected to one end (8) connected to one end of the first partially circular wall segment (5) by a mesh (9) extending inwardly of the first partially circular wall segment (5), the first and second partially circular segments having a common center (30) with the radius of the internal surface (12) of the first partially circular wall segment (5) being slightly larger than the radius (13) of the external surface (14) of the second partially circular arm segment (8 =. The two hinge members (1, 1 ') are required in a hinge formation to receive a hinge (24), one of the hinge members (1) has its partially circular arm segment (8) connected to its segment of hinge (1, 1'). partially circular wall (5) at one end adjacent to the rear wall (3). The other (V) has its partially circular arm section (8 ') connected to its partially circular wall segment (5') at the end at one edge of the front wall (2). The invention also includes folding doors or the like employing the aforementioned hinge members.