Adjustable legs for desks and furniture

Claim 1

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.