- 3 - K lk . perspective view of a preferred embodiment of a chair assembly in accordance with the present invention, in association with a foot-

^re * FIGS 2 to 9 are side elevational vims of the chair assembly of HG.1, illustrating in phantom the various available modes or types of adjustability for the components of the overall assent including compos.. 2 and rest (HG..,, sea, alone (HG.3), arm-rest <FIG.4> , bad-e ^ dinal adjustment (HG. ₅ ), backrest pivotal adjustment (HG6), head-rest vertical adjustment (FIG.8) and head-res. pivotal adjustment (FIG.9,;

_H G 10 is a side elevational view of a chair assembly accordance with the present invention, showing in more detail the various internal components therefor responsible for the adjustabil ⁱ ty;

HG ll is aperspective viewofa basic chair -wein accordance

-_> the invention, again showing the various intemat components without _ov αlyteg cu_Moning ∞d ∞ ^veril, 8 ^ιna,eliaI;

FIG 12 is a vim taken along the line 12-12 of HG. 11;

HG 13 is a sectional view of a means employed in accordance __ the invention allowing for adjustment, both vertically and horizontally, of a head-rest mechanism or portion of an overaU chair assembly;

HG 14 is a view taken along the line 1 -14 of HG. 13; and _πG _ is a side elevational view of a preferred embodiment of a foot stoo. or foot rest for use with a chair assembly in accordance with the

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Turning now to FIGS. 10 and 11 there is illustrated therein an especially preferred embodiment of a base or ground-engaging means 1 and associated support means 6 in accordance with the invention. As explained hereinafter in more detail the arrangement is such as to allow for ready adjustment of the angular position of the overall seat member 2 relative to the ground and the ground-engaging means 1. There are also incorporated means allowing for adjustment of the overall height of the seat member 2 above or relative to the ground.

The ground-engaging means 1 can be seen, as illustrated more clearly in FIG. 11, to consist of a substantially U-shaped assembly 1 to be disposed on the ground or load-bearing surface, as for example the floor of a building or the like. In the preferred embodiment illustrated the ground engaging means is made up of two longitudinally-extending members 1A, IB and an end lateral member 1C, adapted to be interconnected in any known manner. In the .arrangement as illustrated the end lateral member 1C is of a size and shape as to be, at its ends, disposed internally of end portions ID of members 1A and IB respectively, whereby to be fixed relative thereto. In an alternative embodiment, not shown, the ground-engaging means can be in the form of an integral U-shaped member, rather than three separate, interconnected members as illustrated.

The U-shaped member 1 can be constructed of any suitable material, but in an especially preferred embodiment will be constructed of a suitable metallic material and be of hollow, tubular form. It should be realised, however, that the principal requirement is that it must be capable of supporting foreseeable loads to be disposed on the overall chair assembly, and could therefore be constructed from any suitable load-bearing material, for example plastics material.

Adapted, in use, to extend angularly upwardly from a first end of the base or ground-engaging U-shaped member 1 is the support means 6, preferably in the form of a substantially H-shaped assembly consisting of side members 13 and a cross-member 14. The support means 6 is adapted to be pivotally connected to the free ends of the U-shaped ground-engaging member

SUBSTITUTE SHEfcT |

1 in any suitable manner, as for example by pinning at 15, whereby to be pivotably angularly movable relative thereto. At the other end of the support means 6 there are provided means for co-operation with the seat member 2 of the overall chair assembly, such means to be described in more detail later in this specification.

In the preferred embodiment illustrated angular adjustment or adjustability between the means 1 and 6 is achieved by operation of a so-called screw jack or gas-actuated pneumatic or hydraulic piston-cylinder arrangement

16 adapted to extend between those means 1 and 6, with the respective ends of such screw-jack or piston-cylinder arrangement 16 being mounted on the associated means 1 and 6 in any suitable manner, as for example by means of mounting brackets or collars 17 as illustrated. The arrangement is such that operation of the screw jack or piston-cylinder arrangement 16, by any suitable means, functions to vary the relative angular disposition of the means 1 and 6. Since the support means 6 is operatively connected to the seat member 2 of the overall chair assembly, this results in the angle to the vertical, or horizontal, of the seat member 2 being adjustable to suit particular requirements of any particular user, as illustrated in phantom in FIGS. 2 .and 3, for example.

The chair or seat member 2, as illustrated for example in FIGS. 10 and 11, includes a main frame, preferably made up from a plurality of channel-shaped members of any desired length, etc. adapted to be interconnected in any known manner, as for example by pinning, welding or the like. As shown in FIG. 10, in particular, suitable padding or cushioning means, generally designated C, can be disposed on the frame. As shown in FIGS. 10 and 11 the arrangement includes means to constitute the arm-rest members 4A, adapted to be pivotally movable in relation to the seat member 2 in a manner to be described hereinafter.

In the preferred embodiment illustrated the support means 6 is constructed of hollow tubular elements, with the uppermost ends of the side members 13 thereof being adapted to co-operate with and receive, in a substantially telescoping manner, complementary-shaped projecting members

21 of the seat member 2 extending downwardly from side-walls 4A of that seat

- 6 - member 2, thereby allowing for relative interconnection therebetween. The degree of penetration of the complementary-shaped members 21 of the seat member 2 into the side members 13 of the support means 6 can be varied by interaction between adjustment bolts 22 provided in each side member 13 and complementary-shaped apertures 22 provided in members 21. In this manner the actual height of the seat member 2 above the base or ground-engaging means 1 can be adjusted in a finite manner whereby to cater for different leg lengths in users of the chair assembly, as illustrated in phantom in HG. 3.

Turning again to HGS. 10 and 11, there is illustrated therein the main frame of the seat member 2, that main frame including respective side- wall members 25 interconnected at the rear by a cross-member 26 and having, at the other end thereof, the aforementioned downwardly protruding members 21 adapted to co-operate with the support means 6 of the base assembly 1 in the aforesaid manner. The arrangement as illustrated includes means for mounting a load-supporting assembly therein, in conjunction with a suitable cushioning means. This may be achieved in any suitable manner, and does not constitute part of the invention. In an especially preferred embodiment, however, an array of support members of any given type may be disposed laterally of the seat member 2. The arrangement as illustrated in HGS. 10 and 11 also includes means for the location thereon of arm-rest members 4A. To be more specific, each side-wall member channel-shaped 25 of the main frame includes an opening 28 therein adapted to receive a complementary-shaped upwardly projecting member 29 provided on the arm rest member 4A. Here again the degree of penetration of the projecting members 29 from the arm-rest members

4A into the arm-rest openings 28 can be varied, whereby to allow for adjustment of the height of the arm-rest members 4A above the seat member 2. In the preferred embodiment illustrated the spatial position of the member 29 can be adjusted through selective interaction between a pin or the like member 30 adapted to extend through the rear portion of arm-rest member 4A and a plurality of correspondingly-shaped apertures 31 provided in the member 29 itself. The arm-rest member 4A then pivots about a hinge point 21.

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Again with reference to HGS. 10 and 11, there is illustrated therein a frame assembly to be located relative to the main frame whereby to give rise to the overall seating means, including the back-rest portion 3. As illustrated the frame assembly can be constructed of a lattice-work of straps 40, preferably of nylon webbing or the like material, to be disposed laterally of the back-rest frame and seat frame in any suitable manner, as for example by the utilization of mounting brackets 41 adapted to co-operate with complementary members provided internally of the frame members. The frame created by the lattice-work of straps 40 provides a surface for receiving and retaining thereon a suitable cushioning means, not to mention a preferred means for adjustment of the back-rest portion 3 of the overall chair assembly.

In the arrangement as illustrated channel members, generally designated 55, are adapted to make up the lower-most longitudinally extending arm of the respective side frames 25. Those channel members 55 have a plurality of apertures or adjusting holes (not shown) disposed along the surface thereof. The back-rest member 3 is movably connected to the seat member 2 per medium of a plate-like member or mounting bracket 56 adapted to be located within the channel member 55 as illustrated. A plurality of downwardly-extending bolts or pin members 57 are associated with said plate- like member 56. In use the actual position of the back-rest member 3 relative to the seat member 2 can be adjusted horizontally as illustrated, by location of the bolts or pins 57 within the appropriate aperture.

The angular inclination of the back-rest member 3 relative to the seat member 2 can be adjusted or varied by operation of the back-rest pivotting member or recliner mechanism 70, as again illustrated in HGS. 10 and 11.

In accordance with a preferred embodiment (not shown), the back-rest member 3 can be constructed from an overall frame having a plurality of adjusting straps disposed laterally thereof. Those straps are each preferably constructed in the form of a longitudinally extending strip having loops (closed) located at each end, said loops allowing for location of the overall strap within the frame on suitable vertically extending members (not shown). In the preferred embodiment illustrated the overall contour provided for the back-rest

- 8 - member 3 can be adjusted to suit differing requirements by means of contour adjustment screws 41a.

In HGS. 10, 13 and 14 there is shown a preferred embodiment of an adjustable headrest mechanism for use in a chair assembly in accordance with the invention. Such a headrest mechanism is capable of adjustment in two ways. Firstly, the actual height thereof above the chair backrest can be adjusted to suit the needs of different users; and secondly in effect horizontal adjustment relative to the chair backrest is possible.

The arrangement as illustrated is adapted to be fixedly located, in any known manner, relative to the chair backrest frame. The means for such fixing, however, forms no part of the invention.

In general terms the head-rest in accordance with the invention includes a head-receiving member 50, preferably in the form of a contoured member of a suitable cushioning material, having a supporting arm member 51 extending therefrom and adapted to be received within the back-rest frame in a manner to be described in more detail hereinafter. The arm member 51 includes, towards the lowermost end thereof, a plurality of vertically spaced- apart apertures 52 co-operable with a complementary-shaped fixing member (not shown) whereby to allow for adjustment of the vertical height of the contoured member 50 relative to the back-rest frame.

The fixing assembly within the back-rest frame, as illustrated, includes respective inner and outer substantially tubular members 60 and 61, with the inner tubular member 60 being adapted to receive and releasably and adjustably retain therewithin the supporting arm member 51. The inner tubular member 60 is adapted to be pivυ tally movable laterally within the outer tubular member, about a pivot pin 62. The outer tubular member 61 has associated therewith, and pivotable relative thereto via a pivot pin 63, a so-called quadrant plate 64 having a plurality of teeth 65 thereon. At the lower end of the inner tubular member 60 there is provided a detent means or latching member 66 co- operable with the quadrant plate 64 in the manner as illustrated, for example, in HG. 13. The arrangement is such that pivotal movement of the inner tubular member 60 brings the quadrant plate 64 out of contact with the detent means

E T

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66, thereby allowing for ready front to back adjustment of the angular position of the overall headrest 50.

As an accessory to the aforementioned seat assembly there may be provided a foot-stool asssembly, generally designated 7, as illustrated more particularly in HG. 15. The foot stool assembly 7 as illustrated therein includes a ground-engaging member or stool base 71 of any known type, preferably located on castors or the like 72 whereby to allow for ready portability or movability thereof. The ground-engaging member 71 has a shaft or the like member 73 protruding normally therefrom, said shaft 73 being adapted in use to co-operate with a complementary-shaped member 74 protruding downwardly from a foot-rest portion generally designated as 75. The shaft 74 includes a plurality of holes 76 therein adapted, in use, to co-operate with a pin, bolt or the like member 77 extending through the complementary-shaped member 74 of the foot rest portion 75. In such a way the height or disposition of the foot- rest portion 75 above the ground-engaging member 71 can be altered to suit differing personal requirements.

As illustrated, for example, in HG. 15, the foot-rest portion 75 is also adapted to be angularly adjustable relative to the ground-engaging member 71. As illustrated the foot-rest member 75 includes a main peripheral frame 75a of any suitable shape. The member 74 has a tubular member 78 fixedly secured at the uppermost end thereof and extending normally thereof, substantially laterally of the foot-rest portion 75. The main frame then includes collar-like members 79 extending inwardly from each side thereof, said collar-like members 79 being adapted to releasably and rotatably co-operate with the tubular member 78, thereby allowing for pivotal movement of the overall foot- rest member 75 relative to the member 74. Each collar-like member 79 has an angle-adjusting plate 80 extending downwardly therefrom. The member 74 includes mounting brackets at the upper end thereof, with an appropriate adjusting slot or the like means provided therein. The arrangement is such that a pin or the like member 82 disposed through the aperture of the angle- adjusting plates 80 and the brackets will fix the foot-rest portion 75 in any

-10-

^ ^ ~ ; ~ --- -vemen,of

following claims. etermined from me

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CLAIMS

1. An adjustable seat assembly including: a seating or load- supporting means; a back-rest means associated with said seating means; a head-rest means associated with said back-rest and disposed at the upper-most end thereof; arm-rest members disposed on each side of said seating means; and a ground-engaging or support assembly connected with said seating means, the arrangement being such that said seating means, back-rest means, head-rest means, arm-rest members and support assembly are all relatively movable whereby to allow the overall assembly to be continuously and selectively adjustable into and between a plurality of operating or in-use configurations to suit different physical and/or physiological requirements of the user.

2. The seat assembly as claimed in claim 1, wherein said back-rest means is pivotally attachable to said seating means. 3. The seat assembly as claimed in claim 2, wherein said ground- engaging means is in the form of a substantially U-shaped arrangement adapted, in use, to be disposed on a suitable load-supporting surface, and to be pivotally connected to a further substantially H-shaped arrangement adapted to extend substantially upwardly therefrom, said substantially H-shaped arrangement being adapted to receive and retain said seating means and associated arm-rest members.

4. The assembly as claimed in claim 3, wherein said pivotal movement between said respective U-shaped and H-shaped arrangements is achieved by a screw-jack means or by a gas actuated, pneumatic or hydraulic piston-cylinder arrangement operably connected therebetween.

5. The assembly as claimed in claim 4, wherein said arm-rest members are each connected at one end to a free end of said H-shaped arrangement of said ground-engaging means, and are adapted to be movable upwardly relative to said H-shaped arrangement. 6. The assembly as claimed in claim 4, wherein both said U-shaped and H-shaped arrangements are constructed from a plurality of substantially hollow tubular elements, said elements being pivotally interconnected, as by pinning or the like means.

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- ^■ The assembly as claimed in claim 5, wherein said arm-rest members each include a substantially vertically disposed framework, made up of respective channel shaped elements, adapted to have disposed thereon cushioning means, upholstery means or the like, said framework including a ^{• β} rs, downwardly protruding member adapted to be disposed within a substantially vertically di^ channei-shaped element and to be selectively movabie verticaUy therewith*, and a second downwardly e tending member adapted to be disposed within a second verticaUy disposed channei-shaped member and to be selectively movable relative thereto, wherein said selective movement in each case is achieved by lc atio„ of a pin member or the like within a se!ected one of piurahty „ _f complementary-shaped apertures. 8- The assembly as claimed in claim 7, wherein said back-res. means

- » the form of a substantially paraUelepipedal-shaped framework having a p ur_U^ ₀ fadjusti _ng s_.ps disposed ter_U _{y lhe} r _{∞t ttle tension i]l said} beingselectively adjustable whereby to aϋowfor variation of the overaU contour of said back-res. framework whereby to suit _____ ^.^ _llmbat requirements of the user.

9. The assembly as claimed in claim 8, wherein said straps are each constructed of a substantiaHy inelastic material.

10. ^ _{assembly M daimed jn daim 9f wherein} ^ _varioug members and means making up said assembly axe formed of a metallic material, each member or means having disposed thereon cushioning and/or upholstery material.

said back-rest member.