US4593874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable legs for desks and furniture
Assignee: Individual
•
Filing: 1984-09-27
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Granted: 1986-06-10
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Expires: 2004-09-27
Abstract
Abstract A set of adjustable legs for raising and lowering desks and other furniture comprises outer tubular members attachable to the desk or other furniture and inner tubular members slidably and non-rotatably received within the outer members and adapted for vertical movement relative thereto. A threaded shaft having a sprocket on its upper portion is rotatably mounted within the members for moving the inner member relative to the outer member, and a chain interconnects the sprockets of each of the shafts for simultaneous rotational movement to move the inner member along the shaft and thereby raise and lower the desk. The legs may be operated by an electric motor or hand crank connected to the chain.
Inventors
- 👤 Lawrence G. Dunagan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:15
CPC Classifications
A; A47; A47B; A47B9/00; A47B9/04; A47B2200/00; A47B2200/0035; A47B2200/005; A47B2200/0056
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
401 words
A set of adjustable legs for raising and lowering desks and other furniture comprising; open ended elongated square outer tubular members of thin wall metal tubing having attachment means disposed on at least one side wall for attaching said outer tubular members to the side wall of said desks and other furniture, said outer tubular member enclosed near its top end by a stop plate member having a central aperture, a mating elongated square inner tubular member of thin wall metal tubing slidably and non-rotatably telescopically received within each said outer tubular member and adapted for vertical movement relative thereto, said inner tubular member enclosed at its top end by a top plate member and at its bottom end by an end cap member each having a central threaded aperture, a shaft rotatably disposed within each said outer and inner tubular member for moving said inner member relative to said outer member, said shaft having an elongated threaded lower portion and a first smooth reduced diameter upper portion defining an annular shoulder therebetween, said lower portion threadedly received within the threaded aperture of said top plate member of said inner member and said first smooth reduced diameter upper portion extending rotatably through said stop plate of said outer tubular member, bearing means operably disposed on said reduced diameter between said shoulder and the underside of said plate of said outer member, a drive transmitting sprocket secured to each said shaft for receiving and transmitting rotary motion thereto, a chain operatively interconnecting each said drive sprocket for rotating each said shaft simultaneously, rotary drive means connected to said chain for imparting rotary motion thereto whereby rotation of said chain and said shaft moves said inner member vertically along said threaded portion relative to said outer member, at least one said shaft having a second reduced diameter portion spaced above the first reduced diameter forming a shoulder therebetween and a free turning idler sprocket journaled thereon for rotary motion relative thereto, said chain interconnecting said sprocket for rotating said sprocket indepent of said at least one shaft, and leveling means threadedly received within the threaded aperture of each said end cap member at the bottom of each said inner tubular member for vertical movement relative thereto for selectively and independently adjusting the height of said inner tubular member relative to the floor to maintain said desks and other furniture in a level position.
Claim 2
Dependent Claim
401 words
A set of adjustable legs for raising and lowering desks and other furniture comprising; open ended elongated square outer tubular members of thin wall metal tubing having attachment means disposed on at least one side wall for attaching said outer tubular members to the side wall of said desks and other furniture, said outer tubular member enclosed near its top end by a stop plate member having a central aperture, a mating elongated square inner tubular member of thin wall metal tubing slidably and non-rotatably telescopically received within each said outer tubular member and adapted for vertical movement relative thereto, said inner tubular member enclosed at its top end by a top plate member and at its bottom end by an end cap member each having a central threaded aperture, a shaft rotatably disposed within each said outer and inner tubular member for moving said inner member relative to said outer member, said shaft having an elongated threaded lower portion and a first smooth reduced diameter upper portion defining an annular shoulder therebetween, said lower portion threadedly received within the threaded aperture of said top plate member of said inner member and said first smooth reduced diameter upper portion extending rotatably through said stop plate of said outer tubular member, bearing means operably disposed on said reduced diameter between said shoulder and the underside of said plate of said outer member, a drive transmitting sprocket secured to each said shaft for receiving and transmitting rotary motion thereto, a chain operatively interconnecting each said drive sprocket for rotating each said shaft simultaneously, rotary drive means connected to said chain for imparting rotary motion thereto whereby rotation of said chain and said shaft moves said inner member vertically along said threaded portion relative to said outer member, at least one said shaft having a second reduced diameter portion spaced above the first reduced diameter forming a shoulder therebetween and a free turning idler sprocket journaled thereon for rotary motion relative thereto, said chain interconnecting said sprocket for rotating said sprocket indepent of said at least one shaft, and leveling means threadedly received within the threaded aperture of each said end cap member at the bottom of each said inner tubular member for vertical movement relative thereto for selectively and independently adjusting the height of said inner tubular member relative to the floor to maintain said desks and other furniture in a level position.
Claim 3
Dependent Claim
44 words
The adjustable legs according to claim 1 wherein said rotary drive means comprises an electric motor having a drive sprocket connected to said chain, associated control switches for controlling the direction of rotation thereof, and adjusting means for adjusting the tension in said chain.
Claim 4
Dependent Claim
30 words
The adjustable legs according to claim 1 wherein two adjacent side walls of said outer tubular member are cut away to provide apertures which allow passage of said chain therethrough.
Claim 5
Dependent Claim
35 words
The adjustable legs according to claim 1 wherein said chain operatively connects said drive sprocket of said rotary drive means, said drive sprockets of each said shaft, and said idler sprockets in an endless loop.
Claim 6
Dependent Claim
31 words
The adjustable legs according to claim 1 wherein said rotary drive means comprises a hand crank assembly having a drive sprocket operatively connected to said chain for imparting rotational movement thereto.
Claim 7
Dependent Claim
27 words
The adjustable legs according to claim 2 wherein said electric motor includes a hand crank assembly operatively connected thereto for selectively imparting rotational movement to said chain.
Claim 8
Dependent Claim
391 words
A vertically adjustable desk comprising; a set of telescoping adjustable legs each having an open ended elongated square outer member of thin wall metal tubing secured to at least one side wall of said desks and other furniture and a mating elongated square inner member of thin wall metal tubing slidably and nonrotatably telescopically received within each said outer member and adapted for vertical movement relative thereto for raising and lowering said desk, said outer tubular member enclosed near its top end by a stop plate member having a central aperture, said inner tubular member enclosed at its top end by a top plate member and at its bottom end by an end cap member each having a central threaded aperture, a shaft rotatably disposed within each said outer and inner tubular member for moving said inner member relative to said outer member, said shaft having an elongated threaded lower portion and a first smooth reduced diameter upper portion defining an annular shoulder therebetween, said lower portion threadedly received within the threaded aperture of said top plate member of said inner member and said first smooth reduced diameter upper portion extending rotatably through said stop plate of said outer tubular member, bearing means operably disposed on said reduced diameter between said shoulder and the underside of said plate of said outer member, a drive sprocket secured to each said shaft for receiving and transmitting rotary motion thereto, a chain operatively interconnecting each said drive sprocket for rotating each said shaft simultaneously, rotary drive means connected to said chain for imparting rotary motion thereto whereby rotation of said chain and said shaft moves said inner member vertically along said threaded portion relative to said outer member, at least one said shaft having a second reduced diameter portion spaced above the first reduced diameter forming a shoulder therebetween and a free turning idler sprocket journaled thereon for rotary motion relative thereto, said chain interconnecting said sprocket for rotating said sprocket indepent of said at least one shaft, and leveling means threadedly received within the threaded aperture of each said end cap member at the bottom of each said inner tubular member for vertical movement relative thereto for selectively and independently adjusting the height of said inner tubular member relative to the floor to maintain said desks and other furniture in a level position.
Claim 9
Dependent Claim
391 words
A vertically adjustable desk comprising; a set of telescoping adjustable legs each having an open ended elongated square outer member of thin wall metal tubing secured to at least one side wall of said desks and other furniture and a mating elongated square inner member of thin wall metal tubing slidably and nonrotatably telescopically received within each said outer member and adapted for vertical movement relative thereto for raising and lowering said desk, said outer tubular member enclosed near its top end by a stop plate member having a central aperture, said inner tubular member enclosed at its top end by a top plate member and at its bottom end by an end cap member each having a central threaded aperture, a shaft rotatably disposed within each said outer and inner tubular member for moving said inner member relative to said outer member, said shaft having an elongated threaded lower portion and a first smooth reduced diameter upper portion defining an annular shoulder therebetween, said lower portion threadedly received within the threaded aperture of said top plate member of said inner member and said first smooth reduced diameter upper portion extending rotatably through said stop plate of said outer tubular member, bearing means operably disposed on said reduced diameter between said shoulder and the underside of said plate of said outer member, a drive sprocket secured to each said shaft for receiving and transmitting rotary motion thereto, a chain operatively interconnecting each said drive sprocket for rotating each said shaft simultaneously, rotary drive means connected to said chain for imparting rotary motion thereto whereby rotation of said chain and said shaft moves said inner member vertically along said threaded portion relative to said outer member, at least one said shaft having a second reduced diameter portion spaced above the first reduced diameter forming a shoulder therebetween and a free turning idler sprocket journaled thereon for rotary motion relative thereto, said chain interconnecting said sprocket for rotating said sprocket indepent of said at least one shaft, and leveling means threadedly received within the threaded aperture of each said end cap member at the bottom of each said inner tubular member for vertical movement relative thereto for selectively and independently adjusting the height of said inner tubular member relative to the floor to maintain said desks and other furniture in a level position.
Claim 10
Dependent Claim
43 words
The desk according to claim 7 wherein said rotary drive means comprises an electric motor having a drive sprocket connected to said chain, associated control switches for controlling the direction of rotation thereof, and adjusting means for adjusting the tension in said chain.
Claim 11
Dependent Claim
29 words
The desk according to claim 7 wherein two adjacent side walls of said outer tubular member are cut away to provide apertures which allow passage of said chain therethrough.
Claim 12
Dependent Claim
34 words
The desk according to claim 7 wherein said chain operatively connects said drive sprocket of said rotary drive means, said drive sprockets of each said shaft, and said idler sprockets in an endless loop.
Claim 13
Dependent Claim
30 words
The desk according to claim 7 wherein said rotary drive means comprises a hand crank assembly having a drive sprocket operatively connected to said chain for imparting rotational movement thereto.
Claim 14
Dependent Claim
25 words
The desk according to claim 8 wherein said motor includes a hand crank assembly operatively connected thereto for selectively imparting rotational movement to said chain.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |