GB2538812A

GB2538812A - Anti-ligature door assembly

Info

Publication number: GB2538812A
Application number: GB1510677.6A
Authority: GB
Inventors: Monaghan John
Original assignee: JOHN MONAGHAN Ltd
Current assignee: JOHN MONAGHAN Ltd
Priority date: 2015-06-17
Filing date: 2015-06-17
Publication date: 2016-11-30
Anticipated expiration: 2035-06-17
Also published as: GB2538812B; GB201510677D0

Abstract

Sliding door assembly having a door 2 supported by a sliding assembly, which may be a sliding carriage with rollers 24 within an upper track 25, relative to a frame 1 constructed to prevent ligature about the top edge of the door and prevent access to the sliding assembly for tamper or ligature purposes. The anti-ligature preferably includes a top edge overlap element 26 mounted on the door frame overlapping the top edge of the door; side overlap elements may also be provided. Preferably Shielding elements 40 in the track assembly close or cover the gap in the track and prevent access to the sliding assembly. The shield elements may be flexible resilient rubber flanges allowing passage of carriage post (27, fig.2). A displaceable shutter (60, figs. 6, 7) may be drawn across the track upon opening and closing of the door. The door preferably sides into a cavity or pocket.

Description

Intellectual Property Office Application No. GII1510677.6 Rum Date:17 August 2015 The following terms are registered trade marks and should be read as such wherever they occur in this document: Magneo (Page 10) Dorma (Page 11) Intellectual Property Office is an operating name of the Patent Office www.gov.uk/ipo

ANTI-LIGATURE DOOR ASSEMBLY Background

The present invention relates to a slide opening door assembly, a kit comprising a slide opening door frame assembly and a door leaf, a method for assembling a door leaf in a slide opening door frame assembly, and the use thereof in manner to prevent misuse including ligature and tampering, more particularly the use thereof in structures which house vulnerable or violent individuals.

In buildings which house vulnerable or violent individuals there is often a need to secure against accidents, intentional self-harming, damage to property and the like. One particular example of this is buildings which house individuals with mental health problems who are, in many cases, more liable to accidents and in some cases may be prone to harming themselves intentionally.

A risk exists that an individual might damage their surroundings and thereby create an insecure or unsafe environment which presents an opportunity to self-harm. In such case it may be required to transit the individual to temporary accommodation. Transit and temporary housing both present further security risks.

A particular concern is to prevent an opportunity presenting itself for an individual to take their own life by hanging. A dual approach is taken to prevent such an opportunity presenting itself, firstly removing any material which might serve as a ligature, and secondly removing any point in a room which might serve as a ligature point.

Doors present a particular ligature risk. Although efforts have been directed at eliminating ligature points from doors, addressing in particular modifications to the door hinge, door top edge and architrave which might be used to secure a ligature, hinged opening doors by definition continue to present a ligature risk.

There remains a need to overcome, obviate or mitigate one or more disadvantages of the prior art, whether identified herein or elsewhere, or to provide for an alternative to or improvement of existing apparatus, assemblies or methods.

Brief description

There is provided herein an improved door assembly addressing this need. In particular there is provided herein a door assembly comprising a door frame assembly and a door leaf which makes use of an opening and closing mechanism other than a pivotal mechanism, more preferably wherein the mechanism for opening and closing of the door leaf is other than a hinge mechanism, more preferably is a sliding mechanism, more particularly whereby a top edge of the door leaf is received within the frame assembly in closed position and in open position and in any position therebetween. Preferably the top edge of the door leaf is enclosed by the frame assembly in closed position and in open position and in any position therebetween. In a particular advantage the door assembly prevents ligature or increased risk of ligature at the door leaf top edge on opening of the door leaf.

In a broadest aspect there is herein provided a door assembly comprising a door frame assembly 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. The door leaf comprises door leaf top edge and is preferably disposed in relation to the door frame assembly in closed position and in open position in manner to prevent ligature about or at the door leaf top edge. The door leaf top edge may be profiled in anti ligature manner.

Preferably the door assembly is configured in manner such that the door frame assembly provides a top overlap (0T) with the door leaf at the door leaf top edge, with the door leaf in open position and in closed position. Preferably top overlap is provided by means of at least one top overlap element to the door frame assembly. Preferably the door frame assembly thereby receives, more preferably obscures, more preferably encloses the door leaf top edge.

The door assembly may be further configured in manner such that the door frame assembly provides a side overlap Os with the door leaf at both side edges thereof, with the door leaf in closed position. Preferably side overlap is provided by means of a side overlap element to each side piece of the door frame assembly. Preferably the door frame assembly thereby receives, more preferably obscures, more preferably encloses both door leaf side edges with the door leaf in closed position. The door frame assembly moreover provides a side overlap Os with the door leaf at one side edge thereof, with the door leaf in open or part open position.

A 'door leaf as herein referred is as known in the art, and variously defined as a single independently moving panel of a door. A single door leaf features a single panel that fills an entire door way space. Usually referred to in common usage simply as the door itself. A door leaf as herein referred comprises two faces, being an inside face and an outside face. The inside face is to be disposed in manner that it is vulnerable to ligature attempt. The outside face may be disposed in manner that it is vulnerable to ligature attempt or otherwise.

A 'door assembly' as herein referred may be a domestic or commercial slide opening door assembly, an interior or exterior slide opening door assembly or the like. Commercial slide opening door assemblies and exterior slide opening door assemblies may include high security hydraulically operated assemblies and the like. Preferably a door assembly as herein referred is a domestic slide opening door assembly, more preferably an interior domestic slide opening door assembly. By this is meant that the door assembly whilst being highly secure does not give a visual appearance of a high security door assembly.

Overlap may be at the inside face or preferably at both faces of the door leaf.

Preferably the door frame assembly comprises a head piece and two side pieces. Overlap OT is defined as a portion or portions of the door leaf overlapped by one or more overhead overlap elements. An overhead overlap element may be integral with or separate from the head piece. Overlap Os is defined as a portion or portions of the door leaf overlapped by one or more side overlap elements. A side overlap element may be integral with or separate from a side piece.

Advantageously the top overlap is disposed in manner together with the door frame assembly or head piece portion or component thereof to enclose the door leaf top edge. Overlap may be at one or preferably both faces of the door leaf. Preferably overlap OT is at both faces of the door leaf and in combination with the door frame assembly or headpiece portion or component thereof provides a door frame assembly top rebate RT which receives, more preferably obscures, more preferably encloses the door leaf top edge.

Advantageously a side overlap is disposed in manner together with the door frame assembly or side piece or component thereof to enclose one or both door leaf side edges. Overlap may be at one or preferably both faces of the door leaf. Preferably overlap Os is at both faces of the door leaf and in combination with the door frame assembly or side piece or component thereof provides a door frame assembly side rebate Rs which receives, more preferably obscures, more preferably encloses the door leaf side edges in closed position.

Advantageously the overlap is configured in anti tamper manner in manner to withstand manual impact or manually inflicted impact.

A ligature' is anything used for tying or binding something tightly, for example a cord or wire. A ligature is therefore anything which might be used to form a noose for the purpose of strangulation, or to tie off a limb or appendage with the risk of causing harm, by intention or accident.

A 'ligature point' is defined as any point which is load bearing, for example able to support over 40kg, that can be used to support a cord, rope or other material for the purpose of strangulation or causing harm.

In the present context, a ligature point is taken to refer to a 'ligature point' as known in the art of hinged opening doors and equally applicable in the present context, including and selected from any of assembly elements including door leaf top edge, gaps and apertures around door leaf top and side edges such as door leaf to frame assembly tolerances, fixing heads such as screw heads and the like; door leaf or frame assembly profiles including architraves, panelling and the like; door or frame furniture including door handles, locks and the like.

Additionally in the present context, a ligature point is taken to refer to previously unattributed 'ligature points' such as any of the above in the context of the art of sliding door assemblies in particular including and selected from any of sliding door leaf to sliding door frame assembly tolerances and also including sliding assembly profile, gaps and apertures providing access to sliding assembly, and the like. Sliding door assemblies are previously unknown in the context of housing individuals at risk of self harming.

Features of the door assembly disclosed herein prevent or reduce the risk of ligature associated with hinge opening door assemblies.

Anti ligature' is defined as meaning opposed to or against ligature. Hence an anti ligature door assembly is such assembly which is opposed to or against ligature or which lacks ligature points.

Anti ligature' features include any of the above 'ligature points' adapted to oppose ligature, for example chamfered or profiled door leaf top edge.

Reference herein to 'tamper' or 'tampering' is taken to mean to interfere with or interfering with, preferably to mean misuse of, misusing or attempt or attempting to prevent functioning of, for example including damage or damaging by dismantling or obstructing or by direct or indirect impact and the like. Reference is typically in relation to a door assembly or part thereof as herein defined, in any manner to interfere with said door assembly or part thereof as herein defined.

Features of the door assembly disclosed herein prevent or reduce the risk of tampering associated with hinge opening door assemblies.

Accordingly in the present context 'anti tamper' is defined as meaning opposed to or against tampering.

Anti tamper' features include and are selected from any of any of the above features defined for the purpose of anti ligature, and additionally features for withstanding impact at any part of a slide opening door assembly and the like and preventing damage to the door assembly or part thereof or preventing malfunctioning of the door assembly or part thereof, in either case in particular to prevent generation of a ligature point or other self harming point. Anti tamper features include including and are selected from impact resistance features such as reinforcing by means for example of oversized frame elements, door leaf to frame overlap and the like.

Preferably the door frame assembly comprises anti ligature points as hereinbefore defined. Preferably the door frame assembly provides one or more upwardly tapered element(s) disposed at a door frame assembly top edge thereof, for example an architrave element as known in the art having a chamfered upper face. Preferably the door assembly provides a closure or closures for a sliding assembly or part thereof and the like, for example a closure for part(s) thereof disposed in the frame assembly more preferably in the head piece thereof.

Preferably the door assembly is constructed of anti tamper material, more preferably high strength material such as metal for example steel, engineering composite materials or solid wood and/or comprises components configured in manner to confer high strength, such as oversized components. Preferably components are configured in manner such that the weight thereof confers strength and yet permits convenient assembly. Preferably the door frame assembly comprises hollow components, most preferably components are constructed in shaped sheet steel. Preferably the door leaf comprises solid wood, metal or engineering composite materials as known in the art.

The door assembly is configured to be received in a support or structure or a support within a structure such as a wall or building, for example in a support opening such as a wall opening, preferably in a reinforced support opening such as a reinforced wall opening, for example an opening in a wall having an opening with formwork thereabout to receive a door assembly, more particularly having oversized formwork.

The door assembly may comprise a single door leaf or plural door leaves, for example two door leaves and more preferably comprises one door leaf.

Sliding door assemblies are known in a number of configurations including in front of the wall sliding door assemblies, in the recess sliding door assemblies and in the wall door assemblies also known as pocket door assemblies. The door assembly as herein defined may be any such configuration unless otherwise indicated. Preferably the herein defined door assembly is an in the wall assembly also known as a pocket door assembly.

A 'pocket door' assembly herein is defined as an assembly comprising a door leaf and a hollow wall, pocket, recess, bay or compartment in a support such as the wall at the side of a doorway, or in the present context at the side of a door frame assembly. The door leaf slides into and is concealed within the pocket in open position. A pocket may be provided by the door frame assembly or a support therefor or both. Preferably the door frame assembly comprises a pocket.

Such door assembly eliminates ligature risk which is fundamental to hinge opening doors in exposing the door top edge in open position. Specifically the presently defined door assembly is configured in manner to conceal the door top edge within the door frame assembly in open position.

Moreover such door assembly eliminates ligature risk which is fundamental to hinge opening doors in providing access to the door leaf top edge at least at one face thereof, in closed position. Specifically the door assembly is configured in manner to enclose the door leaf top edge within the door frame assembly in closed position, more preferably at both faces thereof.

A sliding door assembly comprises a sliding assembly which provides a sliding point of engagement of door leaf in door frame assembly. Such sliding point of engagement potentially renders the door leaf vulnerable to tampering for example by impact at a face of the door leaf. The hereindefined door assembly configured in manner to provide overlap of door and frame at the door leaf top edge and at one or both side edges as hereinbefore defined prevents tampering and/or reduces tamper risk. Overlap is provided at the door leaf top edge and one side edge in the case of the door leaf in open position, or at the door leaf top edge and both side edges with the door leaf in closed position.

Preferably the door assembly is configured in manner to conceal the door leaf in open position and to conceal part of the door leaf in part open position. The door frame assembly may be configured at one side edge thereof to interface with the support in manner that the door leaf is concealed by the support at one or both faces thereof, in open position. Preferably the door frame assembly provides a recess or pocket to one side thereof to receive the door leaf in open position. Preferably the recess or pocket is configured in manner to be received within the wall. Preferably the door frame assembly comprises a facing element to be disposed at one side thereof in relation to the recess or pocket to conceal the door leaf in open position. Alternatively or additionally a facing element is provided by the support element in relation to the pocket, in manner to conceal the pocket and optionally additionally conceal the door, in open position. Such facing element to the support element may comprise plasterwork or the like or may comprise a panel to be affixed to the support element.

Most preferably the door assembly is a pocket door assembly. A pocket door assembly may be provided pre assembled with the door leaf installed in the pocket, or may be provided in two components being a door leaf and a door frame assembly as hereinbefore defined including a pocket or bay configured to receive the door leaf, more preferably provided in three components being a door leaf, a door frame assembly as hereinbefore defined and a pocket or bay configured to receive the door leaf. Additional fixings and elements including separate overlap elements are suitably provided as additional assembly components. In one embodiment the door assembly is a high strength assembly as hereinbefore defined. Preferably such door assembly is provided in two parts or three parts as hereinbefore defined. This is of particular advantage in facilitating convenient assembly without compromising strength conferred by weight and /or size of components.

In a further aspect there is provided a kit for a door assembly as hereinbefore 20 defined comprising a door frame assembly and a door leaf as hereinbefore defined.

In a further aspect there is provided a door frame assembly or a door as hereinbefore defined for use in a door assembly as hereinbefore defined.

In a further aspect there is provided a method for installing a door assembly as hereinbefore defined in a support structure having an opening to receive said door assembly, comprising providing the door frame assembly as hereinbefore defined, providing a door leaf as hereinbefore defined slideably engaged in said door frame assembly or separately therefrom, installing the door frame assembly in the support opening and optionally loading and slideably engaging the door leaf within the door frame assembly. Door frame assembly overlap at door leaf top edge and door leaf side edges as hereinbefore defined may be provided integral with or separate to the frame assembly. Preferably in the case of separate overlap, the method comprises providing one or more overlap elements as hereinbefore defined, locating at the door leaf top edge and/or side edges and securing. Securing may be prior to or subsequent to installing or loading the door leaf or both.

Preferably a support structure opening is prepared to receive the door frame assembly. In the case of a support structure comprising a wall, studwork is provided about the opening, being sized and shaped to receive the door frame assembly and secure in place in anti tamper manner. The support structure about the opening and the exposed studwork is then finished by plastering or panelling or other means as known in the art.

In a further aspect there is provided a method for assembling a door assembly as hereinbefore defined which is a two part assembly of a door leaf and door frame assembly further comprising one or more separate overlap elements, the method comprising installing the door frame assembly in a support structure as hereinbefore defined, slideably engaging the door leaf within the door frame assembly, and subsequently positioning and securing the overlap elements. A facing element as hereinbefore defined may be provided by an overlap element or may be provided in association with an overlap element.

Sliding door assemblies comprise a sliding assembly. Such sliding assembly potentially presents a ligature risk and/or is vulnerable to tampering. Known sliding assemblies typically comprise one or more elongate track elements and/or one or more sliding elements and means for engagement with the door frame assembly and/or with the door leaf for sliding engagement of door frame assembly and door leaf.

A sliding assembly may be operated or activated manually, electrically or magnetically or any combination thereof as known in the art. In the case of an electrically and/or magnetically operated assembly, such as an electromagnetic drive sliding assembly, for example the Magneo electromagnetic drive operator (Dorma) for door leaves up to 80KG weight, and corresponding for heavier door leaves or multiple door leaves, components are disposed in relation to the assembly. Preferably the sliding assembly is electromagnetically driven and comprises for example electrical components including circuitry, wiring and /or contacts, electro magnetic components and magnetic components such as solenoids and magnets. Components are disposed along the length of the track element. Such components are vulnerable to tampering, components thereof may also provide a ligature risk.

A track element or elements may be disposed in continuous or intermittent fashion along a head piece of the frame assembly or along the door leaf at or towards its top edge. Sliding element(s) may comprise one or more rolling or static sliding surfaces. A track may be located overhead of the door top edge or to one or either side thereof and concealed by the overlap as hereinbefore defined for the purpose of coupling engagement of the door via its top edge to the sliding assembly.

Preferably the sliding assembly comprises an overhead elongate track and a sliding mechanism, more particularly comprises an elongate profile member providing therein one or more overhead elongate tracks, for example two parallel tracks and configured to receive a plurality of sliding elements. Sliding elements may comprise one or more skids, rollers or wheels. The element(s) are configured to be slidingly received within the profile member. Preferably one of said track(s) and sliding element(s) is provided in association with the door frame assembly and the other(s) thereof is provided in association with the door leaf as hereinbefore defined. Preferably the sliding element(s) are received within the profile member in manner to engage with the track. Either of elongate track and sliding element includes separate or integral coupling means for engagement with the door frame assembly or door leaf or both. More preferably elongate track is mounted or mountable to the door frame assembly. Preferably sliding element(s) comprise coupling mean(s) for engagement with the door leaf.

The hereindefined sliding door assembly may be configured in manner to conceal and/or prevent access to the sliding assembly thereby preventing ligature at the sliding assembly and/or prevent tampering with the sliding assembly. The presently disclosed slide-opening door assembly provides a number of preferred or alternative configurations which address and obviate tamper risk and/or ligature risk at the slide assembly in open position and in closed position, as enumerated hereinbelow.

Description of preferred embodiments

In an embodiment the door assembly is disposed and configured in manner which prevents access to the sliding assembly for tamper purpose or for ligature purpose. The sliding assembly may be provided in one or more cooperating parts as hereinbefore defined. The sliding assembly or its parts are disposed within the door frame assembly headpiece at a top portion of the top overlap or preferably overhead the top overlap.

The top overlap is suitably defined as that part of the door leaf overlapped by the frame assembly headpiece or an overlap element to the headpiece. The top overlap OT is suitably characterised by top overlap height o.h. being the height of the door leaf overlapped by the overlap element. o.h is the vertical distance between a lower edge of the overlap element and the top edge of the door leaf.

The top overlap OT provides a top overlap tolerance o.t. between parallel opposed faces of the overlap element and the door leaf face, i.e. an overlap face of the overlap element and the door leaf face overlapped thereby.

Preferably o.h. is greater than or equal to 2 cm, more preferably is in a range 30 from 2 cm or 5cm or 8cm to 40 cm, more preferably is in a range from 2cm or 5 cm or 8cm to 30cm, such as in a range from 10 cm or 14 cm to 25cm or 21 cm for example is 15 cm, 16 cm, 17 cm, 18 cm, 19 cm or 20 cm.

Preferably top overlap tolerance o.t. is less than or equal to 1.2 cm, more preferably is in the range from 0.1 to 1.0 cm, more preferably in the range 0.1 to 0.8 cm such as 0.1 to 0.6 cm for example is 0.2 cm, 0.3 cm, 0.4 cm or 0.5 CM.

Preferably the ratio of o.h. to o.t., o.h./o.t., is greater than or equal to 16, preferably greater than or equal to 20. o.h. / o.t need have no upper limit to function as hereinbefore defined. The greater the ratio, the more restricted is access to the sliding assembly.

In a practical limit however a range of o.h / o.t may be envisaged as 20 to 200, preferably 20 to 140, such as for example 30 to 133, 40 to 133 or 50 to 133. Alternatively expressed as the inverse, ratio of o.t. / o.h. may be envisaged as less than or equal to 0.06, preferably less than or equal to 0.05, such as 0.05 to 0.005 or 0.05 to 0.0075.

The range of o.h / o.t typically increases with increasing overlap. For example for a door assembly providing top overlap in the region of 8cm, the range of o.h / o.t may be 20 to 40. Alternatively for a door assembly providing top overlap in the region of 15cm, the range of o.h / o.t may be 25 to 50. Alternatively for a door assembly providing top overlap in the region of 18cm, the range of o.h / o.t may be 30 to 60. Alternatively for a door assembly providing top overlap in the region of 24cm, the range of o.h / o.t may be 30 to 80. Alternatively for a door assembly providing top overlap in the region of 32cm, the range of o.h / o.t may be 40 to 110. Alternatively for a door assembly providing top overlap in the region of 40cm, the range of o.h / o.t may be 50 to 130.

Access to the sliding assembly between the overlap element and the door leaf in closed position is determined as a function of the ratio o.h / o.t and is expressed as overlap angle o.a being the angle subtended by a straight line, herein the maximum access line al., which contacts the top edge of the door leaf and the lower edge of the overlap element. o.h, o.t. and a.I form a right angled triangle. o.a. is thus defined as tan -1 (o.t. / o.h.) or tan -1/ (o.h. / o.t.).

The location of the sliding assembly overhead of the overlap, preferably disposed centrally above the door leaf or offset towards the "outside" face of the door leaf as hereinbefore defined, determines the angle o.a required to prevent an object inserted between the overlap element and the door leaf from accessing the sliding assembly located overhead of the door leaf top edge. Preferably the angle o.a. is less than or equal to 30°, more preferably in the range 25° to 0.2°, more preferably in the range 20° to 0.2°, more preferably in the range 15° to 0.2°, more preferably in the range 100 to 0.2°, more preferably in the range 8° to 0.2°, more preferably in the range 4° to 0.2°, more preferably in the range 2.9° to 0.4°, such as for example 1.71° to 0.44°, 1.43° to 0.44°, 1.145° to 0.44°.

For example for a door assembly providing top overlap in the region of 8cm, the range of angle o.a. may be 2.86° to 1.430. Alternatively for a door assembly providing top overlap in the region of 15cm, the range of angle o.a may be 2.29° to 1.145°. Alternatively for a door assembly providing top overlap in the region of 18cm, the range of angle o.a may be 1.71° to 0.91°. Alternatively for a door assembly providing top overlap in the region of 24cm, the range of angle o.a may be 1.71° to 0.71°. Alternatively for a door assembly providing top overlap in the region of 32cm, the range of angle o.a. may be 1.43° to 0.51°. Alternatively for a door assembly providing top overlap in the region of 40cm, the range of angle o.a may be 1.145° to 0.44°.

The angle minimum angle o.a may decrease with increasing thickness of the door leaf. In the case of a door assembly having a single face at risk of ligature or tampering, the angle o.a. decreases with a sliding assembly positioned at or towards one side of the door leaf remote from the face thereof presenting ligature or tamper risk.

Preferably the 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. Preferably securing is by means of anti tamper and anti ligature fixing means. More preferably securing is by fixing means introduced at a lower face or edge of the overlap element, more preferably a substantially horizontal face thereof, within a presunk hole therein. A presunk hole restricts or a face of the door frame assembly adapted to receive the overlap element for example in the case of a hollow door frame assembly, seats in a lower face thereof. Preferably the overlap element and lower face of the door frame assembly against which it is to seat comprise mutual seating means, for example mating presunk locating and fixing holes. Preferably in the case of a hollow overlap element guide, means is provided between the presunk fixing hole and an opposing seating for fixing means. We have found that this facilitates in admirable manner manually locating the opposing seating for the fixing means. Preferably the overlap element is a top rail, more preferably is a hollow rectangular, trapezoidal or like cross section element having o.h as hereinbefore defined. Preferably the top rail is an oversized element conferring anti tamper strength, having overlap element depth or thickness in the range 3 cm to 9 cm, for example in the range 5 cm to 8 cm, such as 6 cm, 7 cm or 8cm. Preferably the top rail is located at a lower substantially horizontal face of a headpiece as hereinbefore defined. Preferably the seating for fixing means is provided in the lower headpiece face. Such seating is thereby concealed within the headpiece and top rail.

The door assembly as hereinbefore defined provides an overlap as hereinbefore defined with the door leaf in closed position or in partially closed position. Alternatively or additionally the door assembly provides an overlap void with the door leaf in open or partially open position. An overlap is disposed adjacent to an overlap void V in the case of partially open or partially closed position.

The overlap void has height ov.h corresponding to the sum of overlap height o.h. as hereinbefore defined and a distance between door leaf top edge and sliding assembly. Overlap void depth or thickness ov.d is preferably in the range 3 cm to 8 cm, more preferably 5 cm to 7 cm, such as for example 5.5 cm, 6 cm or 6.5 cm. Overlap void depth or thickness corresponds to the sum of door leaf thickness and overlap tolerances o.t to each face. Overlap void prevents access to the sliding assembly. For example access is only possible with use of an implement of length in excess of o.h as hereinbefore defined. Such implements are unavailable in ligature risk environments.

The door assembly may comprise one or more shielding elements which restrict access within the overlap void to the sliding assembly or its parts. A shielding element may be static or dynamic, flexible, resiliently deformable, conformable or rigid or any combination thereof.

A shielding element may comprise one or more constriction members which restrict access within the overlap or overhead having regard to the overlap and which restrict access to the sliding assembly or its parts. Constriction member(s) may be selected from one or more elongate flanges, ribs or the like, disposed in manner to create a constriction therebetween or between the or each constriction member and a face of the frame assembly, of the overlap member, of the door leaf or the sliding assembly. Preferably constriction member(s) comprise two inwardly disposed flanges or a single elongate flange or spacer. The constriction member may be disposed along a surface comprised within the overlap such as for example along an inner surface of the overlap or the frame assembly, or along the door leaf at or towards the top edge thereof or in association with the sliding assembly or a combination thereof.

Constriction members may be rigid or flexible such as resiliently deformable.

One or more rigid constriction members may provide an elongate constricted aperture for sliding engagement of the door leaf with the sliding assembly. One or more flexible or resiliently deformable constriction members may provide an elongate dynamic constricted aperture which allows passage of sliding engagement means or sliding coupling means therebetween or thereabout and which encloses the sliding assembly above the door leaf and above the overlap void alike.

Alternatively or additionally the door assembly comprises dynamic shutter means disposable in manner to enclose the sliding assembly. Preferably dynamic shutter means are configured in manner to advance along the elongate track with the advance of the door leaf towards open position.

Preferably dynamic shutter means are configured in manner to return along the elongate track with the return of the door leaf towards closed position. Dynamic shutter means may engage with the door leaf top edge or sliding engagement means or the like. Engagement may enable advance of shutter means responsive to advance of the door leaf and /or may facilitate a secure tamper proof enclosure about the sliding assembly. Dynamic shutter means may comprise or be associated with biasing means to retract along the elongate track, for example biasing means may be disposed within the door frame assembly at a side edge thereof, such as within a side edge thereof, more particularly within or concealed by a side jamb or closing jamb.

Dynamic shutter means are of particular advantage in restricting access to the sliding assembly, more preferably a sliding mechanism such as a drive mechanism as hereinbefore defined or component thereof with the door leaf in open or partially open position. Accordingly a ligature and/or tamper vulnerability inherent in sliding door assemblies is addressed in admirable and versatile manner.

In the corresponding method for assembling the door assembly of the first embodiment as hereinbefore defined there is provided a method comprising providing the door frame assembly, the door leaf and the sliding assembly, loading the door leaf in the door frame assembly, and bringing the door leaf and frame into coupling engagement by means of the sliding assembly. Preferably the method comprises subsequently securing one or more overlap elements if provided as a separate component.

The present slide-opening door assembly moreover overcomes the disadvantage of access to door leaf top and side edges presented by a hinge opening door leaf in closed position. Specifically a slide opening door assembly enables concealing the door leaf top and side edges within the door frame assembly. Conventionally slide opening door assemblies may be provided in a single unit with door leaf preloaded within the frame assembly. The door assembly of the present invention is preferably provided in two parts being the door frame assembly and the door leaf, either or both comprising components of the sliding assembly. The presently disclosed slide-opening door assembly provides a number of preferred or alternative configurations which facilitate providing such assembly and method for assembly thereof, as enumerated hereinbelow.

Accordingly in a further embodiment there is provided a door assembly as hereinbefore defined which is a pocket door assembly comprising a door frame assembly as hereinbefore defined, a door leaf as hereinbefore defined wherein the door frame assembly provides a pocket to receive the door leaf in open position, wherein the assembly is provided in a plurality of parts for assembly in situ, comprising 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, together with at least one overhead overlap element provided in one or more further part or parts and wherein the door assembly provides top overlap as hereinbefore defined and wherein the door assembly further comprises at least one side overlap element provided in one or more further part or parts, more particularly in the form of a closing jamb. A closing jamb may provide side overlap at one or both door leaf faces. Preferably side overlap s.o. (b) and s.o.(c) is in the range from 2 cm to 5.5 cm, more preferably from 2.5 cm to 3cm or from 3cm to 5 cm such as for example 2.8 cm, 2.9 cm, 3.0 cm, 3.6 cm, 4.0cm, 4.4cm or the like. Preferably side tolerances correspond to overhead tolerances as hereinbefore defined.

Preferably the side piece comprises a bracing piece or preloading cavity lining element configured to be received in an opening in a support structure and providing a bracing width or preloading cavity width b.w. and the side overlap element comprises a single part providing overlap at both door leaf faces s.o.(b), wherein b.w. is greater than or equal to the sum of s.o.(b) and the corresponding overlap depth at the opposite door leaf side edge s.o.(c). Preloading cavity liner has bracing depth or preloading cavity depth b.d. which is greater than side jamb depth j.d., and may enable loading the door leaf at side edge lb with side edge lc initially out of alignment, bringing door leaf into alignment and securing and sliding into pocket, thereafter positioning and securing closing jamb with side overlap tolerances as hereinbefore defined.

Such door frame assembly facilitates providing door leaf and frame overlap overhead as hereinbefore defined and additionally at both door leaf side edges, in manner that facilitates in situ loading of the door leaf without compromising tolerances. This is particularly advantageous in preventing tampering by impact and/or ligature. More particularly the door assembly is able to withstand impact without sustaining damage and/or ligature may be prevented about the door leaf top edge and/or sliding assembly. Preferably the door frame assembly is configured to receive the door leaf with overhead overlap tolerance as hereinbefore defined and more preferably with corresponding side overlap tolerances. Tolerances as hereinbefore defined serve to preclude a gap between door leaf and frame assembly and further prevents ligature between the door leaf and frame.

Preferably a door leaf as hereinbefore defined has thickness in the range 4 cm to 6cm such as for example in the region of standard thicknesses 4.4 cm to 4.9 cm or 5.4 cm to 5.9 cm. A door leaf may comprise surface facings or coverings for cosmetic or protective purpose. Preferably preloading cavity depth b.d is in the range 6 cm to 9cm, for example 6.9 cm to 7.8 cm such as 7.2 cm, or in the range 7.9 cm to 8.8 cm such as 8.2 cm. Preferably closing jamb depth is in the range 4.6 cm to 7.5 cm, for example 5.2 cm to 7.0 cm such as 5.5 cm or in the range 5.2 cm to 8.0 cm such as 6.5 cm. preferably closing jamb provides side overlap tolerances corresponding to top overlap tolerances as hereinbefore defined.

In the corresponding method for assembling the door assembly of the further embodiment as hereinbefore defined there is provided a method comprising providing the door frame assembly overhead piece and side pieces in a first part, securing in a support structure opening as hereinbefore defined, providing and installing the sliding assembly, providing and installing a frame side edge, preferably comprising a preloading cavity lining element or bracing piece as hereinbefore defined and providing the door leaf, loading the door leaf in the door frame assembly, and bringing the door leaf and frame into sliding engagement by means of the sliding assembly, sliding the door leaf into open or partially open position, locating and securing the overhead overlap element and the side overlap element, wherein the method includes providing and installing a closing jamb to the side edge subsequent to sliding the door leaf into partially open position. Overhead and side overlap elements may be secured in sequence or simultaneously.

The assembly and method provide for overlap and tolerances as hereinbefore defined in a multiple part assembly for in situ loading of door leaf as hereinbefore defined.

The door assembly as hereinbefore defined may comprise a door frame assembly bottom piece disposable across the door frame assembly and slideably engageable with the door leaf lower edge as known in the art. In a further embodiment the door assembly comprises a slideably engageable door frame bottom piece wherein the bottom piece or door leaf provides a sliding assembly engageable with door leaf and bottom piece. A sliding assembly preferably comprises a sliding element as hereinbefore defined. The assembly of this embodiment is particularly advantageous in providing robust and smooth sliding of an anti tamper door assembly as hereinbefore defined, more particularly an oversized door assembly provided in high strength materials to withstand impact.

Detailed Description

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 Figure 1 illustrates the door assembly comprising a door frame assembly and door leaf; Figures la -lc illustrate the door leaf overlap with oversized overlap member in closed, partially open and open position; Figure 2 illustrates the sliding assembly and relations of oh., o.t. and o.a. in a door frame assembly; Figure 3a illustrates the sliding assembly and overlap void; Figure 3b illustrates the oversized overlap member comprising guide means for fixing; Figures 4 and 5 illustrate the headpiece including shielding elements with the door leaf in open and closed position; Figure 6 illustrates the headpiece including dynamic shutter means; Figure 7 illustrates the door assembly including headpiece including dynamic shutter means of Figure 6, with shutter means retracting into side piece; Figure 8 illustrates the pocket door assembly provided in multiple parts; Figure 9 illustrates the separate closing jamb for a pocket door assembly of Figure 8; Figures 10a and 10b illustrate the door assembly including bottom piece having rolling gear.

The door assembly of Figure 1 comprises a slide-opening door assembly comprising a door frame assembly (1) having head piece (la) and side pieces (1 b, 1c). The assembly may be a single leaf assembly having headpiece (1) extending to one side of a side edge (1 b or lc), or a double leaf assembly having head piece extending to both sides of side edges (1 b and 1c), shown as optionally foreshortened illustration. The door assembly also comprises door leaf (2) having a door leaf top edge (2a) and side edges (2b, 2c). Sliding assembly (3) is illustrated disposed along the head piece (la).

Door leaf (2) 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 (2) is slideable between a closed position in which the door leaf (2) occupies the aperture A defined between headpiece and side pieces (la, 1 b, 1c) and restricts entry and exit, and an open position in which the door leaf occupies a door leaf bay (B) to one side of both side pieces (1 b, 1c).

The door frame assembly (1) is disposed and configured in manner to overlap the door leaf (2) at a top overlap OT and at side overlap Os to either side or both sides. Overlap secures the door assembly against ligature and against tampering by impact.

Figure 2 illustrates the sliding assembly (3) provided within head piece (1a) 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 (2).

Overhead overlap member (26) overlaps door leaf (2) 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 (2) defined as tan-1 (o.t./o.h.) or tan-1 / (o.t./o.h.) where o.t. is the overlap tolerance between door leaf (2) and overlap member (26) and o.h. is the height of the door leaf (2) overlapped by the overlap member (26).

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 (2) and overlap member (26) prevents access to the door leaf top edge (2a) and to the sliding assembly (3).

Figure 3a illustrates the arrangement of Figure 2 with the door leaf (2) in open position and door leaf (2) position replaced by 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).

Figure 3b illustrates a feature of the top overlap member (26) facilitating securing the overlap member (26) to head piece (1 a). In particular a guide means (30) for a fixing element such as a screw is provided extending internally within the 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 head piece (la) 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).

Figure 4 and 5 illustrate the assembly of Figures 3a and 2 wherein, where not indicated, parts have the identity indicated in Figures 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 (2) 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).

Figures 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 (2). Side edge (1b) receives the shutter means (60) with the closing of the door leaf (2). Biasing means (70) located within the side edge (1 b) 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.

Figure 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 or at least one overhead overlap element (26) is provided separately to the overhead piece (la). Separately provided overhead overlap element (26) is conveniently secured to the head piece (la) after installing the door leaf (2) in situ. Preferably overlap element (26) is a hollow element constructed of steel as hereinbefore defined. Securing to the head piece (la) 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 the or at least one side overlap element (84) is provided separately to the side edge (1 b). By this means door leaf (2) can be located in position in the aperture A parallel aligned to the place 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 hereinbefore defined is provided.

Figure 9 illustrates the side piece as hereinbefore defined. A side overlap is for example a pocket jamb or a closing jamb (84) as known in the art. Closing jamb (84) is received in bracing piece or preloading cavity lining element (90) which is received in form work or stud work (92). In a preferred embodiment as hereinbefore described and defined, the bracing piece or preloading cavity lining element (90) provides bracing width or preloading cavity lining width b.w which is greater than or equal to the sum of side overlap s.o(b) + side overlap s.o.(c) at the pocket jamb (not shown). Preferably bracing depth or preloading cavity lining depth b.d is greater than closing jamb depth j.d. Coupling door leaf (2), and sliding into an open position, serves to vacate a preloading cavity defined by the preloading cavity liner 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 lb in preloading cavity with door leaf out of alignment and swinging into alignment in manner to slide into pocket or bay B, with subsequent adjustment of side overlap tolerances by means of closing jamb.

Figure 10a and Figure 10b illustrate the door assembly having bottom piece (110) disposable across the door frame assembly and slideably engageable with the door leaf lower edge (2d) by means of lower rolling mechanism (102) suitably received within the door leaf lower edge (2d). The door assembly of Figure 10a and Figure 10b is particularly useful when providing in reinforced manner whereby the weight of the door leaf merits additional means for support with sliding coupling means.

The invention has been described above in relation to its use as an anti-ligature assembly. However, the very same principles may be used as a very effective way of, for instance, configuring closures in general. For instance, the present invention provides in convenient manner a relatively robust door assembly. Similarly, and furthermore, the door assembly may be provided in lightweight version for cosmetic effect, in similar manner to that described above. Thus, the invention might find greater and wider use than as an anti-ligature assembly.

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.

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.

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.

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.

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.

Claims

Claims 1. An anti-ligature door assembly comprising a door frame assembly, a door leaf having top edge 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, the door assembly being disposed and configured in manner which prevents ligature about the door leaf top edge wherein the door assembly is disposed and configured in manner which prevents access to the sliding assembly for tamper purpose or for ligature purpose.
2. Anti-ligature door assembly as claimed in claim 1 wherein the door frame assembly provides a top overlap OT with the door leaf, to either or both faces of the door leaf, at the door leaf top edge, with the door leaf in open position and in closed position.
3. Anti-ligature door assembly as claimed in claim 2 wherein top overlap is provided by means of at least one top overlap element to the door frame assembly.
4. Anti -ligature door assembly as claimed in any of claims 1 to 3 wherein the door frame assembly provides a side overlap Os with the door leaf, to either or both faces of the door leaf, at both side edges thereof with the door leaf in closed position.
5. Anti-ligature door assembly as claimed in claim 4 wherein side overlap is provided by means of at least one side overlap element to the door frame assembly.
6. Anti-ligature door assembly as claimed in any of claims 1 to 5 wherein frame assembly is constructed of shaped sheet steel..
7. Anti-ligature door assembly as claimed in any of claims 1 to 6 which is a pocket door assembly.
8. Anti-ligature door assembly as claimed in any of claims 1 to 7 wherein the sliding assembly is operated or activated electrically, magnetically, hydraulically or a combination thereof, preferably electromagnetically..
9. Anti-ligature door assembly as claimed in any of claims 1 to 8 wherein the sliding assembly comprises one or more overhead elongate track elements, one or more sliding elements and coupling means for sliding engagement thereof with door leaf and/or frame assembly, together with a drive mechanism therefor comprising one or more electrical components, magnetic components and/or electromagnetic components disposed along the length of the track element.
10. Anti-ligature door assembly as claimed in any of claims 1 to 9 wherein top overlap OT provides top overlap height o.h. being the height of the door leaf overlapped by the overlap element, wherein o.h. is greater than or equal to 2cm, more preferably is in the range from 8 cm to 40 cm.
11. Anti-ligature door assembly as claimed in any of claims 1 to 10 wherein top overlap OT provides top overlap tolerance o.t. being the separation between parallel opposed faces of the overlap element and the door leaf overlapped by the overlap element, wherein o.t. is less than or equal to 1 cm, more preferably is in the range from 0.1 to 0.6 cm.
12. Anti -ligature door assembly as claimed in any of claims 10 and 11 wherein the ratio o.h. / o.t. is greater than or equal to 16, preferably is in the range 30 to 133.
13. An anti-ligature door assembly as claimed in any of claims 10 to 12 wherein access to the sliding assembly and the door leaf in closed position is expressed as overlap angle o.a. being the angle subtended by a straight line, herein the maximum access line al., which contacts the top edge of the door leaf and the lower edge of the overlap element wherein o.a. is defined as tan -1 / (o.h. / o.t.) and is in the range 30° to 0.2°, more preferably in the range 8° to 0.2°, more preferably in the range 4° to 0.2°, more preferably in the range 2.9° to 0.4°.
14. An anti-ligature door assembly as claimed in any of claims 1 to 13 wherein top overlap element comprises guide means between a presunk fixing hole in a lower face thereof and an aperture in an opposing face thereof for purpose of fixing to the frame assembly.
15. An anti-ligature door assembly as claimed in any of claims 1 to 14 which comprises one or more shielding elements which restricts access to the sliding assembly or its component parts within an overlap void V provided by the door leaf in open or partially open position.
16. An anti-ligature door assembly as claimed in claim 16 wherein shielding element is static and is flexible or resiliently deformable, conformable or rigid, preferably comprises one or more constriction members selected from one or more elongate flanges disposed in manner to create a constriction therebetween disposed along the elongate track and shielding access thereto.
17. An anti-ligature door assembly as claimed in claim 16 wherein shielding element is dynamic and is flexible or resiliently deformable, conformable or rigid, preferably comprises shutter means configured in manner to advance along the elongate track with advance of the door leaf to open position and to return along said track with the return of the door leaf to closed position.
18. An anti-ligature door assembly as claimed in claim 17 wherein dynamic shutter means are associated with biasing means to retract along the elongate track, preferably disposed within the door frame assembly at a side edge 30 thereof 19. A kit comprising a door frame assembly and door leaf as hereinbefore defined in any of claims 1 to 18 optionally together with further non-integral components as hereinbefore defined 20. A method for assembling a door assembly or kit according to any of claims 1 to 19 comprising providing the door frame assembly, the door leaf and sliding assembly, loading the door leaf in the door frame assembly and bringing the door leaf and frame into coupling engagement by means fo the sliding assembly, preferably comprising subsequently securing one or more overlap elements.21. A door assembly or component thereof or kit or method substantially as hereinbefore or hereinbelow described or illustrated in the description or figures.Amendment to the claims has been filed as follows: Claims 1. An anti-ligature slide opening pocket door assembly comprising a door frame assembly comprising a head piece and two side pieces, a door leaf having top edge 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 door frame assembly provides a top overlap OT with the door leaf, to both faces of the door leaf, at the door leaf top edge, with the door leaf in open position and in closed position which prevents ligature about the door leaf top edge; and wherein the door frame assembly provides a side overlap Os with the door leaf, to either or both faces of the door leaf, at both side edges thereof with the door leaf in closed position; and wherein top overlap is provided by means of at least one top overlap element cr) to the door frame assembly; wherein top overlap OT provides top overlap height o.h. being the height of the o door leaf overlapped by the overlap element, wherein o.h is in the range 8cm to 40cm; and wherein said assembly comprises anti-tamper impact resistance reinforcing in the form of oversized frame elements and door leaf to frame overlap; and wherein the sliding assembly or its parts are disposed within the door frame assembly head piece overhead the top overlap, which prevents access to the sliding assembly for tamper purpose and for ligature purpose.2. Anti ligature door assembly as claimed in claim 1 which is configured to be received in an opening in a wall having oversized formwork thereabout.3. Anti ligature door assembly as claimed in any of claims 1 and 2 wherein the sliding assembly location overhead of the overlap is disposed centrally above the door leaf.4. Anti-ligature door assembly as claimed in any of claims 1 to 3 wherein the door frame assembly provides a side overlap Os with the door leaf, to either or both faces of the door leaf, at both side edges thereof with the door leaf in closed position; and wherein side overlap is provided by means of at least one side overlap element to the door frame assembly.5. Anti-ligature door assembly as claimed in claim 4 wherein the side piece comprises a preloading cavity lining element configured to be received in an opening in a support structure and providing a preloading cavity width b.w. and the side overlap element comprises a single part providing overlap at both door leaf faces s.o.(b), wherein b.w. is greater than or equal to the sum of s.o.(b) and the corresponding overlap depth at the opposite door leaf side edge s.o.(c).cr) 6. Anti-ligature door assembly as claimed in any of claims 1 to 5 wherein the door assembly provides an overlap void with the door leaf in open or o partially open position wherein the overlap void has height ov.h corresponding to the sum of overlap height o.h. as claimed in any of claims 1 to 5 and a 20 distance between door leaf top edge and sliding assembly, wherein overlap void prevents access to the sliding assembly.7. Anti-ligature door assembly as claimed in claim 6 wherein overlap void depth ov.d is in the range 3 cm to 8 cm. 25 8. Anti-ligature door assembly as claimed in any of claims 1 to 7 wherein the door frame assembly provides a pocket to receive the door leaf in open position, and wherein the assembly is provided in a plurality of parts for assembly in situ, comprising in a first part the door leaf, in a second part the door frame assembly with pocket configured to receive the door leaf, or in second and third parts the door frame assembly and separate pocket configured to receive the door leaf, together with said at least one top overlap element provided in one or more further part or parts and wherein the door assembly provides top overlap as hereinbefore defined and wherein the door assembly further comprises at least one side overlap element provided in one or more further part or parts.9. Anti-ligature door assembly as claimed in any of claims 1 to 8 wherein the sliding assembly comprises one or more overhead elongate track elements, one or more sliding elements and coupling means for sliding engagement thereof with door leaf and/or frame assembly, together with a drive mechanism therefor comprising one or more electrical components, magnetic components and/or electromagnetic components disposed along the length of the track element.10. Anti-ligature door assembly as claimed in any of claims 1 to 9 wherein side overlap s.o. (b) and s.o.(c) at both side edges of the door leaf in closed position is in the range from 2 cm to 5.5 cm.('Si 11. Anti-ligature door assembly as claimed in any of claims 1 to 10 wherein top overlap OT provides top overlap tolerance o.t. being the separation between parallel opposed faces of the overlap element and the door leaf overlapped by the overlap element, wherein o.t. is less than or equal to 1 cm.12. Anti-ligature door assembly as claimed in claim 11 wherein the ratio o.h./ o.t. is greater than or equal to 16.13. An anti-ligature door assembly as claimed in any of claims 11 and 12 wherein access to the sliding assembly and the door leaf in closed position is expressed as overlap angle o.a. being the angle subtended by a straight line, herein the maximum access line al., which contacts the top edge of the door leaf and the lower edge of the overlap element wherein o.a. is defined as tan -1 / (o.h. / o.t.) and is in the range 30° to 0.2°.14. Anti-ligature door assembly as claimed in any of claims 1 to 13 wherein the at least one top overlap element is a top rail located at a lower substantially horizontal face of said headpiece; wherein securing is by fixing means introduced at a lower face or an edge of the overlap element, within a presunk hole therein and seating in a face of the door frame assembly adapted to receive the overlap element.15. Anti-ligature door assembly as claimed in claim 14 wherein securing is by fixing means introduced at a substantially horizontal face of the overlap element, within a presunk hole therein; and said seating for fixing means is provided in a lower headpiece face such that said seating is thereby concealed within the headpiece and top rail.16. Anti-ligature door assembly as claimed in any of claims 14 and 15 wherein the overlap element and face of the door frame assembly against which it is to seat comprise mutual seating means, for example mating presunk locating and fixing holes.('Si 17. An anti-ligature door assembly as claimed in any of claims 1 to 16 wherein top overlap element comprises guide means between a presunk fixing hole in a lower face thereof and an aperture in an opposing face thereof for purpose of fixing to the frame assembly.18. An anti-ligature door assembly as claimed in any of claims 1 to 17 which comprises one or more shielding elements which restricts access to the sliding assembly or its component parts within an overlap void V provided by the door leaf in open or partially open position.
19. An anti-ligature door assembly as claimed in claim 18 wherein shielding element is static and is flexible or resiliently deformable, conformable or rigid, preferably comprises one or more constriction members selected from one or more elongate flanges disposed in manner to create a constriction therebetween disposed along the elongate track and shielding access thereto.
20. An anti-ligature door assembly as claimed in claim 19 wherein shielding element is dynamic and is flexible or resiliently deformable, conformable or rigid, preferably comprises shutter means configured in manner to advance along the elongate track with advance of the door leaf to open position and to return along said track with the return of the door leaf to closed position.
21. An anti-ligature door assembly as claimed in claim 20 wherein dynamic shutter means are associated with biasing means to retract along the elongate track, preferably disposed within the door frame assembly at a side edge thereof.
22. An anti-ligature door assembly as claimed in any of claims 1 to 20 which comprises a door frame assembly bottom piece disposable across the door frame assembly and slideably engageable with the door leaf lower edge.
23. A kit comprising a door frame assembly and door leaf as hereinbefore defined in any of claims 1 to 22 optionally together with further non-integral 15 components as hereinbefore defined
24. A method for assembling a door assembly or kit according to any of o claims 1 to 23 comprising providing the door frame assembly, the door leaf and sliding assembly, loading the door leaf in the door frame assembly and 20 bringing the door leaf and frame into coupling engagement by means of the sliding assembly, and comprising subsequently securing one or more overlap elements.
25. A door assembly or component thereof or kit or method substantially as described or illustrated in the description or figures.