Support tube for an office chair

Details Support tube for an office chair Support tube for an office chair

1998-07-29

1999-11-30

Nelson, Jr., Milton

Chairs and seats

Chair hardware or attachment

248161, A47C 1500

Patent

active

059929405

ABSTRACT:
A support tube for an office chair includes an outer tube, an inner tube fitted in the outer tube, and a shaft fitting movably in the inner tube. The inner tube has a spiral continual oil groove formed in an inner surfacer for a substantial portion, and an upper and a lower annular oil limit groove respectively connected with an upper end and a lower end of the spiral continual oil groove to stop lubricating oil in the spiral oil groove from flowing out of the inner tube so as to always enable the shaft rotate and move up and down smoothly relative to the inner tube.

REFERENCES:
patent: 3381926 (1968-05-01), Fritz et al.
patent: 5556170 (1996-09-01), Lai et al.
patent: 5702083 (1997-12-01), Lai
patent: 5833322 (1998-11-01), Barandiaran

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