EP0133524B1 — Lockable lifting device for the infinitely variab…

Claim 1

Independent Claim 219 words

Lockable lifting device for the infinitely variable adjustment of chair seats, table tops or similar furniture parts, with a guide tube (1) which can be connected to a base frame (4), and with an adjustable-length gas spring (8), the piston rod (10) of which is connected in axially rigid but separable fashion to a bottom plate (5) of a guide tube (1), the housing (9) of which can be connected in axially rigid but separable fashion by an upper fixing portion (21) which has a corresponding hub (22), to the chair seat or table top and the housing (9) of which is guided in the guide tube (1) in laterally rigid but axially displaceable manner, and out of the housing (9) of which an actuating rod (26) for length- adjustment of the gas spring (8) projects upwardly into the fixing portion (21), characterized in that the housing (9) of the gas spring (8) is disposed radially rigidly in an additional tube (20) which forms a constituent part of the gas spring (8) and on which the fixing portion (21) is constructed, one end of the housing (9) bearing axially against an abutment in the region of the fixing portion (21), the other end of the housing (9) bearing against a fixing element (24) connected separably to the tube (20).

Claim 2

Dependent Claim 219 words

Lockable lifting device for the infinitely variable adjustment of chair seats, table tops or similar furniture parts, with a guide tube (1) which can be connected to a base frame (4), and with an adjustable-length gas spring (8), the piston rod (10) of which is connected in axially rigid but separable fashion to a bottom plate (5) of a guide tube (1), the housing (9) of which can be connected in axially rigid but separable fashion by an upper fixing portion (21) which has a corresponding hub (22), to the chair seat or table top and the housing (9) of which is guided in the guide tube (1) in laterally rigid but axially displaceable manner, and out of the housing (9) of which an actuating rod (26) for length- adjustment of the gas spring (8) projects upwardly into the fixing portion (21), characterized in that the housing (9) of the gas spring (8) is disposed radially rigidly in an additional tube (20) which forms a constituent part of the gas spring (8) and on which the fixing portion (21) is constructed, one end of the housing (9) bearing axially against an abutment in the region of the fixing portion (21), the other end of the housing (9) bearing against a fixing element (24) connected separably to the tube (20).

Claim 3

Dependent Claim 26 words

Lockable lifting device according to Patent Claim characterized in that the housing (9) of the gas spring (8) is a sliding fit in the tube (20).

Claim 4

Dependent Claim 46 words

Lockable lifting device according to Patent Claim 1 or 2, characterized in that in the region of the fixing portion (21), the abutment is constituted by a sleeve (23) of a material which is softer than that of the tube (20) and/or of the housing (9).

Claim 5

Dependent Claim 41 words

Lockable lifting device according to Patent Claim 3, characterized in that there is in the fixing portion (21), protruding from the latter, a sliding member (27) which bears against the actuating rod (26) and which is connected to the sleeve (23).

Claim 6

Dependent Claim 23 words

Lockable lifting device according to Patent Claim 1 or 2, characterized in that the fixing element (24) consists of an elastic clamping ring.

Claim 7

Dependent Claim 31 words

Lockable lifting device according to Patent Claim 5, characterized in that the fixing element (24) is connected to the gas spring (8) in such a way as to be axially immovable.

Claim 8

Dependent Claim 29 words

Lockable lifting device according to Patent Claim 6, characterized in that the fixing element (24) has resilient projections (40) which bear against the inside wall of the tube (20).

Claim 9

Dependent Claim 47 words

Lockable lifting device according to Patent Claim 7, characterized in that the fixing element (24) is rotationally rigidly connected to the gas spring (8) and in that the resilient projections (40) engage into at least one pitched groove (47) in the inside wall of the tube (20).

Claim 10

Dependent Claim 27 words

Lockable lifting device according to Patent Claim 8, characterized in that the gas spring (8) comprises a shoulder (sleeve-like portion 37) projecting out of the tube (20).

Claim 11

Dependent Claim 27 words

Lockable lifting device according to Patent Claim 9, characterized in that the gas spring (8) is provided with faces (44) to which a spanner can be applied.

Claim 12

Dependent Claim 215 words

Length-adjustable gas spring (8) for a lockable lifting device for the infinitely variable adjustment of chair seats, table tops or similar furniture parts, with a guide tube (1) connectable to a base frame (4) and of which the piston rod (10) is axially rigidly but separably connected to a bottom plate on the guide tube (1), and the housing (9) of which is axially rigidly but separably connectable by an upper fixing portion (21) with a corresponding hub (22) to the said chair seat or table top, and of which the housing (9) can be axially displaceably and laterally rigidly guided in the guide tube (1) while upwardly protruding from the housing (9) there is an actuating rod (26) for adjusting the length of the gas spring (8), characterized in that the housing (9) of the gas spring (8) is disposed in radially rigid manner in an additional tube (20) which forms a constituent part of the gas spring (8) and on which the fixing portion (21) is constructed and in that one end of the housing (9) bears axially against an abutment in the region of the fixing portion (21) and in that the other end of the housing (9) bears against a fixing element (24) which is separably connected to the tube (20).

Claim 13

Dependent Claim 215 words

Length-adjustable gas spring (8) for a lockable lifting device for the infinitely variable adjustment of chair seats, table tops or similar furniture parts, with a guide tube (1) connectable to a base frame (4) and of which the piston rod (10) is axially rigidly but separably connected to a bottom plate on the guide tube (1), and the housing (9) of which is axially rigidly but separably connectable by an upper fixing portion (21) with a corresponding hub (22) to the said chair seat or table top, and of which the housing (9) can be axially displaceably and laterally rigidly guided in the guide tube (1) while upwardly protruding from the housing (9) there is an actuating rod (26) for adjusting the length of the gas spring (8), characterized in that the housing (9) of the gas spring (8) is disposed in radially rigid manner in an additional tube (20) which forms a constituent part of the gas spring (8) and on which the fixing portion (21) is constructed and in that one end of the housing (9) bears axially against an abutment in the region of the fixing portion (21) and in that the other end of the housing (9) bears against a fixing element (24) which is separably connected to the tube (20).

Lockable lifting device for the infinitely variable positioning of seats, table tops or similar articles, and lengthwise adjustable gas spring for such a lifting device

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