SLIDE OPENING DOOR ASSEMBLY

Abstract

A pocket slide opening door assembly including a door leaf having a top edge, a door frame assembly, and a sliding assembly for slideable translation of the door leaf in relation to the door frame assembly between a closed position and an open position, wherein the assembly is provided in a plurality of parts for assembly in situ, including in a first part the door leaf, in a second part the door frame assembly with bay or pocket configured to receive the door leaf, or in second and third parts the door frame assembly and separate bay or pocket configured to receive the door leaf, and wherein the door assembly is disposed and configured in manner which prevents ligature about the door leaf top edge and in manner which prevents access to the sliding assembly for tamper purpose or for ligature purpose.

Claims

1. A pocket slide opening door assembly comprising: a door frame assembly which comprises a pocket and a door leaf comprising a door leaf top edge, wherein the door assembly comprises a sliding assembly for slideable translation of the door leaf in relation to the door frame assembly between a closed position and an open position, wherein; the door frame assembly provides an overhead overlap (O.sup.O) with the door leaf at the door leaf top edge with the door leaf in the closed position; the door frame assembly provides a side overlap (O.sup.S) with the door leaf at both side edges thereof with the door leaf in the closed position; and the overhead overlap is provided by means of at least one overhead overlap element to the door frame assembly; wherein the sliding assembly or its parts are disposed within a headpiece of the door frame assembly at a top portion of the overhead overlap or overhead the overhead overlap which prevents access to the sliding assembly for a tamper purpose and for a ligature purpose; wherein the at least one overhead overlap element is provided separately and is secured in position in relation to the door frame assembly after loading the door leaf in the door frame assembly, wherein securing is by means of an anti tamper and anti ligature fixing means, and wherein the at least one overhead overlap element is removeably mounted to a clear opening face of the door frame assembly permitting access for a door override; and whereby the door assembly addresses a tamper risk at the sliding assembly in the closed position by an attempt to prevent functioning of or by obstructing the door assembly or a part thereof.

2. A pocket slide opening door assembly comprising: a door frame assembly which comprises a pocket and a door leaf, wherein the door assembly comprises a sliding assembly for slideable translation of the door leaf in relation to the door frame assembly between a closed position and an open position, wherein the door leaf comprises a door leaf top edge; wherein the door frame assembly provides an overhead overlap (O.sup.O) with the door leaf at the door leaf top edge, with the door leaf in the closed position; and provides a side overlap (O.sup.S) with the door leaf at both side edges thereof with the door leaf in the closed position; wherein the sliding assembly and its parts are disposed within a headpiece to the door frame assembly at a top portion of the overhead overlap or in relation to the overhead overlap, which prevents access to the sliding assembly for a tamper purpose and for a ligature purpose; wherein at least one of the side edges of the door leaf is deformable about the side overlap of the frame assembly, and more particularly the door leaf comprises one or more deformable side overlap portions, the deformable door leaf portions being deformable about the side overlap of the door frame assembly, thereby providing for a door leaf override and a door leaf removal, with the door leaf in the closed or a substantially closed position; and whereby the door assembly addresses a tamper risk at the sliding assembly in the closed position by attempt to prevent functioning of or by obstructing the door assembly or a part thereof.

3. The pocket slide opening door assembly according to claim 1, wherein at least one of the side edges of the door leaf is deformable about the side overlap of the frame assembly, and more particularly the door leaf comprises one or more deformable side overlap portions, the deformable side overlap door leaf portions being deformable about the side overlap of the frame assembly, thereby providing for a door leaf override and a door leaf removal, with the door leaf in the closed or a substantially closed position.

4. The pocket slide opening door assembly according to claim 1, wherein either or both of the side overlap is provided by means of at least one side overlap element to the door frame assembly at the clear opening face of the door frame assembly, and the one or more side overlap elements being removeably mounted or mountable or deformable about the side edges of the door leaf, thereby permitting a door leaf override and a door leaf removal, with the door leaf in the closed or a substantially closed position.

5. The pocket slide opening door assembly according to claim 1, wherein the pocket slide opening door assembly is for use in buildings which house vulnerable or violent individuals wherein the door override comprises a door leaf removal from the clear opening face or an outside face thereof, with the door leaf in the closed or a substantially closed position in case of tampering by attempt to obstruct or barricade the door assembly or the door leaf at an inside face of the door leaf.

6. The pocket slide opening door assembly according to claim 1, wherein the overhead overlap by the door frame assembly of the door leaf top edge with the door leaf in the closed position comprises overhead overlap of a part of the sliding assembly provided in association with the door frame assembly, with a part of the sliding assembly provided in association with the door leaf, wherein the sliding assembly comprises one or more elongate track elements and/or one or more sliding elements, and wherein the one or more track elements are removable.

7. The pocket slide opening door assembly according to claim 1, wherein the overhead overlap by the door frame assembly of the door leaf top edge with the door leaf in the closed position is provided by means of the at least one overhead overlap element and the at least one overhead overlap element comprises the sliding assembly or one or more of its parts and is removably mounted to the clear opening face of the door frame assembly for a purpose of the door override.

8. The pocket slide opening door assembly according to claim 1, wherein the sliding assembly comprises an overhead elongate profile member providing one or more elongate sliding tracks and one or more elongate sliding elements comprising one or more elongate static sliding surfaces configured to be slidingly received within or about the elongate profile member, the elongate profile member provided in association with the door frame assembly and the one or more elongate sliding elements provided in association with the door leaf and including an integral coupling means for engagement therewith, wherein the at least one overhead overlap element comprises the elongate profile member which is part of the sliding assembly and is removably mounted to the clear opening face of the door frame assembly for a purpose of the door override.

9. The pocket slide opening door assembly according to claim 1, wherein the door leaf top edge or a portion thereof overlapped by the door frame assembly with the door leaf in the closed position comprises a top edge of one or more parts of an elongate sliding element couplingly engaged with the door leaf and coextensive therewith.

10. The pocket slide opening door assembly according to claim 1, comprising a bottom piece of the door frame assembly disposable across the door frame assembly and slideably engageable with a door leaf lower edge, wherein the bottom piece of the door frame assembly comprises one or more elongate track elements of a sliding assembly and the lower edge of the door leaf provides one or more sliding elements for sliding engagement of the door frame assembly and the door leaf, and wherein the one or more sliding elements comprise one or more static sliding or rolling surfaces.

11. The pocket slide opening door assembly according to claim 1, which is a non-handed pocket slide opening door assembly providing a handed overhead overlap configuration at respective faces of the door leaf selected from a different overhead overlap configuration at respective faces and the handed overhead overlap at a first one of the faces of the door leaf only with the overhead overlap absent at a second one of the faces of the door leaf, wherein at least one handed overhead overlap is provided by the at least one overhead overlap element removably mountable to the clear opening face of the door assembly by means of the anti tamper and anti ligature fixing means, and optionally a further handed overhead overlap is semi-permanently mountable to the second one of the faces of the door leaf thereof by means of a semi-permanent anti tamper and anti ligature fixing means, wherein the door frame assembly is non-handed and is disposable within the pocket to either side of the clear opening face, and the assembly comprises a selection of same and different overhead overlap elements for securing at each of the faces of the door leaf, by a selection of same and different anti tamper and anti ligature fixing means, providing for access for the door override or a door removal.

12. The pocket slide opening door assembly according to claim 1, wherein the door leaf is removably mountable together with a removable sliding track or the at least one overhead overlap element which is removably mountable or both, by means of integral coupling engagement with one or more sliding elements, the one or more sliding elements being slidingly engaged or slidingly engageable with the removable sliding track or with a track portion of the at least one overhead overlap element.

13. The pocket slide opening door assembly according to claim 1, wherein the overhead overlap element is disposable outwardly of a faces of the door leaf and the overhead overlap comprises static sliding surfaces at respective overlapping faces of the at least one overhead overlap element and the door leaf, for example low friction surfaces thereof, and wherein the door frame assembly comprises a bottom piece of the door frame assembly disposable across the door frame assembly and slideably engageable with a door leaf lower edge by rolling means.

14. The pocket slide opening door assembly according to claim 1, wherein the door frame assembly provides a bottom overlap (O.sup.B) with the door leaf at a door leaf bottom edge, with the door leaf in the closed position by means of a bottom piece of the door frame assembly.

15. The pocket slide opening door assembly according to claim 14, wherein the bottom piece comprises a door leaf anti-lift means which limits an elevation of the door leaf within the door frame assembly.

16. The pocket slide opening door assembly according to claim 1, comprising one or more seals between the door leaf and the door frame assembly selected from a one part and two part elongate seal mounted to a door leaf opening side edge and extending outwardly to contact the door frame assembly, and an elongate seal continuous with the door leaf effectively extending the door leaf within the door frame assembly, but being deformable whereby installation and removal of the door leaf is not constrained, and a wiper seal mounted on either of the door leaf and the door frame assembly and comprising an angled deformable blade configured and disposed to loosely contact the other of the door leaf and the door frame assembly at an edge or a face thereof and angled towards a closing side edge.

17. The pocket slide opening door assembly according to claim 1, comprising a damper or two opposing dampers facing outwardly selected from a closing damper providing deceleration at a closing side edge in a damping distance or an amplitude in a range from 15 cm or 20 cm up to 30 cm, an opening or closing damper comprising a resiliently deformable elongate buffer disposed along a door leaf edge or a sidepiece or an end piece of the door frame assembly and combinations thereof.

18. The pocket slide opening door assembly according to claim 1, wherein the door assembly provides one or more constriction members within the overhead overlap which restrict access within the overhead overlap or overhead having regard to the overhead overlap and which restrict access to the sliding assembly or its parts.

19. The pocket slide opening door assembly according to claim 1, wherein the door assembly comprises the pocket providing an opening pocket, and wherein a closing overlap provides a closing pocket, the overhead overlap provides a sliding pocket, which pockets and/or overlaps define a clear opening therebetween having a clear opening width CO.w and clear opening height CO.h where the CO.w is less than a width D.w of the door leaf and the CO.h is less than a height D.h of the door leaf.

20. The pocket slide opening door assembly according to claim 1 wherein the pocket comprises a pocket framework and a lining facing and sealing the pocket framework wherein the lining is selected from a polymer, a metal, an antibacterial polymer, an antibacterial metal, an antibacterial coated polymer, an antibacterial coated metal and a combination thereof.

21. The pocket sliding door assembly according to claim 1, wherein the door frame assembly is non-handed and comprises two overhead overlap elements for securing to a first face and a second face of the door frame assembly by securing fixings which are at the first face non-removable for antitamper purpose, and at the second face removable for purpose of maintenance/door override/door lock open/door lock close panel and door removal or door lock close overhead overlap element and door removal.

22. The pocket slide opening door assembly according to claim 1, wherein the at least one overhead overlap element comprises recessed attachment fixings for securing to the headpiece and/or a sidepiece, the fixings having recessed fixing access.

23. The pocket slide opening door assembly according to claim 1, wherein the door leaf comprises recessed means for locking in the open position.

24. The pocket slide opening door assembly as claimed in claim 1, wherein a door leaf lower edge comprises a sliding element for seating in a corresponding slidingly engageable head piece or bottom piece to the door frame assembly, and wherein the door leaf comprises recessed means for locking in the open position comprising a bolt recessed within the door leaf and means for advancing the bolt to extend vertically out of the door leaf from the door leaf top edge or the door leaf lower edge and means for retracting back into a recessed position, for aligning with one or one of a plurality of apertures in a track of the slidingly engageable headpiece or bottom piece adapted to receive the bolt in an advanced position.

25. A pocket slide opening door assembly comprising: a door frame assembly which comprises a pocket and a door leaf comprising a door leaf top edge, wherein the door assembly comprises a sliding assembly for slideable translation of the door leaf in relation to the door frame assembly between a closed position and an open position, wherein; the door frame assembly provides an overhead overlap (O.sup.O) with the door leaf at the door leaf top edge with the door leaf in the closed position; the door frame assembly provides a side overlap (O.sup.S) with the door leaf at both side edges thereof with the door leaf in the closed position; and the overhead overlap is provided by means of at least one overhead overlap element to the door frame assembly; wherein the sliding assembly or its parts are disposed within a headpiece of the door frame assembly at a top portion of the overhead overlap or overhead the overhead overlap which prevents access to the sliding assembly for a tamper purpose and for a ligature purpose; wherein the overhead overlap element is provided to an inside face and a clear opening face of the door leaf, and the overhead overlap element is securable at the inside face of the door leaf in an anti tamper manner and is securable at the clear opening face of the door leaf for a door override access; and whereby the door assembly addresses a tamper risk at the sliding assembly in the closed position by an attempt to prevent functioning of or obstructing the door assembly or a part thereof.

Description

DRAWINGS

[0251] The assembly is now illustrated in non-limiting manner with reference to the figures, all of which are cross-section views unless otherwise indicated, wherein:

[0252] FIG. 1 illustrates the door assembly comprising a door frame assembly and door leaf;

[0253] FIGS. 1A-1C illustrate the door leaf overlap with oversized overhead overlap member in closed, partially open and open position;

[0254] FIG. 2 illustrates the sliding assembly and relations of o.h., o.t. and o.a. in a door frame assembly;

[0255] FIG. 3A illustrates the sliding assembly and overlap void;

[0256] FIG. 3B illustrates the oversized overlap member or overhead panel comprising guide means for fixing or in an alternative embodiment comprising L-shaped flange and mating routered channel for mounting and securing suitably by recessed fixtures such as screws;

[0257] FIGS. 4 and 5 illustrate the headpiece including shielding elements with the door leaf in open and closed position;

[0258] FIG. 6 illustrates the headpiece including dynamic shutter means;

[0259] FIG. 7 illustrates the door assembly including headpiece including dynamic shutter means of FIG. 6, with shutter means retracting into side piece;

[0260] FIG. 8 illustrates the pocket door assembly provided in multiple parts;

[0261] FIG. 9 illustrates the separate closing jamb for a pocket door assembly of FIG. 8;

[0262] FIGS. 10A-10E illustrate the door assembly including bottom piece having rolling gear, static sliding element or wiper seal;

[0263] FIGS. 11 and 11A illustrates the assembly as defined with reference to clear opening, preload opening and preload aperture, having foreshortened pocket depth, for delivery of door assembly rotated onto its side;

[0264] FIG. 12 illustrates the door assembly having damper arrangements;

[0265] FIGS. 13 to 20 illustrate the door assembly having variants of overhead sliding assembly providing overhead overlap element.

DETAILED DESCRIPTION

[0266] The door assembly of FIG. 1 comprises a slide-opening door assembly comprising a door frame assembly (1) having overlaps at headpiece (1a) and sidepiece and pocket opening (1b, 1c). The assembly is a single leaf assembly having headpiece (5) extending to one side of a side edge (1b or 1c). The door assembly also comprises door leaf (2) having a door leaf top edge (2a) and closing and pocket side edges (2b, 2c). Sliding assembly (3) is illustrated disposed along the headpiece (1a).

[0267] Door leaf (L) is configured to be hung or mounted in the door frame assembly (1) in sliding engagement (engagement coupling not shown) with sliding assembly (3). The door leaf (L) is slideable between a closed position in which the door leaf (2) occupies the doorway clear opening C.O (variously shown as aperture A) defined between overhead overlap portion of headpiece and side piece and pocket opening (1a, 1b, 1c) and restricts entry and exit, and an open position in which the door leaf occupies a pocket (P) to one side of side piece and pocket opening (1b, 1c).

[0268] The door frame assembly (1) is disposed and configured in manner to overlap the door leaf (L) at overhead overlap O.sup.O and at closing overlap O.sup.C and pocket overlap O.sup.P to both door side edges. Overlap secures the door assembly against ligature and against tampering by impact.

[0269] FIG. 2 illustrates the sliding assembly (3) provided within headpiece (5) which is configured to be received within form work or stud work (28). Sliding assembly (3) comprises elongate profile member (20) adapted to receive overhead rolling mechanism (24). In the case of a powered sliding assembly, elongate profile member (20) also comprises drive means (22) such as electrical connections and solenoids disposed along its length. Rolling mechanism (24) includes wheels or rollers for sliding along elongate track portion (25) of elongate profile member (20), and optionally in the case of powered sliding assembly may incorporate electrical connections or magnets (21). An overhead overlap member (26) to either or both door leaf face (shown to both faces) is for example a top rail as known in the art. Coupling means (27) connects the rolling mechanism (24) and door leaf (L).

[0270] Overhead overlap member (26) overlaps door leaf (L) such that a straight line (29) drawn from the door leaf top edge (2a) to the lower face of overlap member (26) fails to penetrate the sliding assembly, for example is obstructed by elongate track portion (25). Straight line (29) subtends an angle o.a. to the door leaf (L) defined as tan.sup.1 (o.t./o.h.) or tan.sup.1/(o.t./o.h.) where o.t. is the overlap tolerance between door leaf (L) and overlap member (26) and o.h. is the height of the door leaf (L) overlapped by the overlap member (26).

[0271] Preferably in the first embodiment as hereinbefore defined the sliding assembly (3) is provided overhead of the position of the door leaf top edge and the height o.h. of the door leaf overlap, optionally in combination with the tolerance o.t. between door leaf (L) and overlap member (26) prevents access to the door leaf top edge (2a) and to the sliding assembly (3).

[0272] FIG. 3A illustrates the arrangement of FIG. 2 with the door leaf (L) in open position and door leaf (L) position replaced by overhead overlap void V. Preferably in the first embodiment as hereinbefore defined the depth of the overlap member (26) prevents access without use of a suitable elongate rigid implement, to the door leaf top edge (2a) and to the sliding assembly (3).

[0273] FIG. 3B (left) illustrates a feature of the overhead overlap member (26) facilitating securing the overlap member (26) to headpiece (5). In particular a guide means (30) for a fixing element such as a screw is provided extending internally within the overhead overlap member from the top face towards (32) or to (34) the lower face thereof. The lower face of the overlap member (26) comprises presunk fixing hole (34) to receive a fixing element. The lower face of the headpiece (5) comprises a remote fixing element (36) such as an embedded or self tapping bolt which secures the end of a screw inserted upwardly from the lower face of the overlap element (26). A plurality of such guide means (30) are provided and a plurality of mating fixing apertures with remote fixing element (36).

[0274] FIG. 3B (right) shows an alternative embodiment comprising L-plate (33, dashes) secured to headpiece or sidepiece and seated in routered channel (31) in overhead overlap element (26) face adjoining the headpiece (5) or adjoining a sidepiece. Channels and L-plates may be positioned suitably in the thickness of the door leaf L. A further channel (35, dotted) internal to the overhead overlap element (26) accommodates locking bolt (38) which is activated by key (not shown) via aperture and optional faceplate (37) to advance the bolt (38) upwardly into a locking aperture (not shown) in the headpiece (5) or to advance the bolt (38) horizontally or upwardly inclined, into a locking aperture (not shown) in a side piece (not shown) to one side of the overhead overlap element (26).

[0275] FIGS. 4 and 5 illustrate the assembly of FIGS. 3A and 2 wherein, where not indicated, parts have the identity indicated in FIGS. 3A and 2, and wherein elongate track (25) comprises one or more shielding elements (40). Shielding elements (40) serve to further obstruct access to sliding assembly (3) with door leaf (L) in open or closed position. Line (29) is obstructed for a broader range of ratios of o.h. to o.t. Shielding elements may be rigid or resiliently deformable flanges providing an aperture for passage of coupling means (27).

[0276] FIGS. 6 and 7 illustrate a variation of shielding means comprising dynamic shutter means (60) optionally engaging with supports or flanges (62) optionally in sealing engagement. Shutter means (60) are engaged by coupling means (27) so as to be drawn along the overlap void V with the opening of the door leaf (L). Side edge (1b) receives the shutter means (60) with the closing of the door leaf (L). Biasing means (70) located within the side edge (1b) or the support structure for door assembly engages the shutter means (60) and retracts the shutter means (60) from overlap void V with the closing of the door leaf.

[0277] FIG. 8 illustrates a pocket door assembly in multiple parts. The reinforced door assembly described herein may conveniently be provided non assembled. However there remains a need to provide in manner to be able to assemble in situ and yet achieve overlap tolerances as herein described. Preferably, the at least one overhead overlap element (26) is provided separately to the headpiece (5). Separately provided overhead overlap element (26) is conveniently secured to the headpiece (5) after installing the door leaf (2) in situ. Preferably overhead overlap element (26) is a hollow element constructed of steel as hereinbefore defined. Securing to the headpiece (5) requires locating a fixing means across the hollow steel element, in this case via a fixing aperture in a face of the overlap element defining the opening aperture, upwardly through an opposing face to seat into a face of the headpiece. Location is unguided and inaccurate. In a particular advantage the overlap element comprises a guide channel between opposing faces to receive a fixing means as previously described. Preferably at least one closing jamb (84) is provided separately to the sidepiece (1b). By this means door leaf (L) can be located in position in the doorway C.O. aperture A parallel aligned to the face of the frame assembly, coupled to the sliding assembly (3) and overlap elements (26, 84) secured in place. By this means a pocket door assembly with overlap tolerances o.t as herein defined is provided.

[0278] FIG. 9 illustrates the side piece as herein defined. A side overlap is for example a pocket jamb or a closing side jamb (84) as known in the art. Closing side jamb (84) is received in preloading cavity lining element (90) which is received in form work or stud work (92). Preloading cavity lining element (90) provides preloading cavity lining width which is greater than closing side jamb width. Preloading cavity lining depth is greater than closing jamb depth. Coupling door leaf (L), and sliding into an open position, serves to vacate a preloading cavity defined by the preloading cavity lining element to receive closing jamb (84) which is located within the preloading cavity and secured in position. By this means a pocket door assembly with overlap tolerances o.t and side overlaps as hereinbefore defined is provided. Significantly this enables loading door leaf at side edge 1b in preloading cavity with door leaf out of alignment and swinging into alignment in manner to slide into pocket P, with subsequent adjustment of side overlap tolerances by means of closing jamb.

[0279] FIG. 10A, FIG. 10B, FIG. 10C and FIG. 10E illustrate the door assembly having bottom piece (100) disposable across the door frame assembly and slideably engageable with the door leaf lower edge (2d) by means of lower static sliding element (not shown) or rolling mechanism (102) suitably received within the door leaf lower edge (2d). The door assembly comprising bottom rolling mechanism (102) of FIG. 10B, FIG. 10C, and FIG. 10E is particularly useful when providing in reinforced door assembly whereby the weight of the door leaf merits additional means for support with sliding coupling means, in particular in combination with an overhead static sliding assembly such as illustrated in FIGS. 13 to 19.

[0280] FIG. 10D illustrates an arrangement with wiper seal (110) angled towards closing side edge. Wiper seal (110) is disposed at door leaf (L) bottom edge (2d) at closing side edge (2b) thereof to lightly contact bottom piece (100) and so as to push aside obstacles as the door leaf L advances. Should an obstacle remain in the path of the advancing door leaf L and impede wiper seal (110), pressure exerted on wiper seal (110) increases pressure of wiper seal (110) contact to bottom piece (100), thereby preventing entrainment of such obstacle. Static sliding or rolling mechanism (102, not shown), if present, is disposed rearwardly of wiper seal (110), having regard to the direction of closing of door leaf (L), as illustrated in FIG. 10E in the form of rolling mechanism (102), or alternatively in the form of static sliding element (not shown) such as a low friction surface of door leaf (L) bottom edge (2d) and/or low friction surface of bottom track recesses and/or flange.

[0281] FIG. 11 illustrates the door assembly with foreshortened pocket depth, suitable for rotating onto a side edge for delivery, with overhead overlap element 26 and side jamb 84 as separate components. A.sup.Ph and A.sup.Pw denote the height and width of a preloading aperture, with overhead overlap element 26 and side jamb absent 84, into which door leaf L is loaded thereafter securing overhead overlap element 26 and side jamb 84 in place. l.h and l.w denote overall height and width of frame assembly.

[0282] FIG. 12 illustrates damping means as described, including inertia reel closing damper 200, having tape 201 attached to the pocket side edge of door leaf L and providing damping distance Dd in excess of 15 cm or 20 cm. Door leaf closing side edge comprises resiliently deformable or compressible buffer 202. Inertia reel damper 201 ensures that an individual cannot be struck with force by the closing door leaf, whilst damper 202 ensures a soft impact at any body part or object struck by door leaf.

[0283] FIGS. 13 to 20 illustrate overhead overlap element comprising integral overhead sliding assembly track releasably mounted to the frame assembly. Parts have the same meaning as in foregoing figures. In this case an overhead overlap element or either or both of two overhead overlap elements (26) include a low friction static sliding surface (300) disposed as a covering or as a part of sliding track (301) at the overhead overlap element (26). Door leaf top edge (2a) comprises in similar manner a low friction static sliding surface (300) disposed as a covering or as a part of sliding element (302) disposed at or forming the door leaf top edge (2a). An overlap may be provided to either or both faces, in any arrangement or combination of arrangements illustrated. Overhead overlap element comprising static sliding track (302) is releasably mounted to a clear opening face F.sup.CO, located opposite to a barricade risk face F.sup.CO. In FIGS. 18 and 20 overlap element (26) and headpiece (5) are illustrated having radiused face (311, 310) to facilitate door leaf (L) removal by tilt at bottom edge of door leaf (not shown). Releasable mounting means are illustrated at the clear opening face F.sup.CO comprising channel (35, dotted) internal to the overhead overlap element (26) for securing to clear opening face F.sup.CO, for accommodating locking bolt (38) which is activated by key (not shown) via aperture and optional faceplate (37) to advance the bolt (38) upwardly into a locking aperture (not shown) in the headpiece (5) or to advance the bolt (38) horizontally or upwardly inclined, into a locking aperture (not shown) in a side piece (not shown) to one side of the overhead overlap element (26). In FIG. 18 is illustrated both configurations of channel (35) and aperture and optional faceplate (38).

[0284] Although a few preferred embodiments have been shown and described, it will be appreciated by those skilled in the art that various changes and modifications might be made without departing from the scope of the invention, as defined in the appended claims.

[0285] Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference.

[0286] All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.

[0287] Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.

[0288] The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.