US 5,234,187 A · Chair height adjustment mechanism

Abstract

An adjustment mechanism for adjusting the height of a chair seat, table top or other item includes telescoping outer, intermediate and inner tubes. The outer tube is attached to a base. The inner tube is attached to a chair seat or other load. A drive extends the telescoping tubes to adjust the height of the load. In one form, the drive includes a flexible, substantially nonelastic tape having an end fixed to the inner tube and an end fixed to the outer tube. The tape engages or rides over a sheave supported on the intermediate tube. In another form, the drive includes a pair of racks and a pinion. A piston cylinder actuator is disposed within the inner tube. The actuator includes an extensible rod which causes relative movement between the inner and intermediate tubes and extension of the intermediate tube relative to the base through the drive tape or rack and pinion.

Claims35

Dependent claims

A telescoping adjustment mechanism, comprising:

an outer tube;
an intermediate tube having upper and lower ends telescopingly received within said outer tube;
an inner tube having upper and lower ends telescopingly received within said intermediate tube;
drive means interconnecting said tubes for translating relative movement of said inner and intermediate tubes into relative movement between said intermediate and said outer tubes;
and
actuator means within said inner tube and having relatively moveable elements connected to said inner tube and said intermediate tube for extending and retracting said inner and intermediate tube with respect to said outer tube.

3 more elements

Dependencies are inferred from the claim text.

Chair height adjustment mechanism

Life of this patent

Chair height adjustment mechanism

Life of this patent

Abstract

Claims35