Torque control mechanism for chairs
First Claim
1. A chair tilt control for a chair comprising a chair control housing mounted on a chair base, a chair seat support member pivotally attached to the forward portion of said chair control housing by pivot means, a main spring member secured to said chair control housing and adapted to resist the pivotal movement of said seat support member, a first lever arm having one end thereof attached to said pivot means and the other end thereof pivotally attached to one end of a first link member, the other end of said link member having a link pin adapted to slide within a link pin retaining groove formed in said chair control housing, and a first tension spring extending between said pivot means and said link pin.
12 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is a knee tilt control mechanism for a pedestal type of chair. The control mechanism has a main torsion spring member secured to the control housing designed to resist pivotal movement of the chair seat about a pivot point on the housing. The chair control mechanism includes one or more lever arms attached at one end to the pivot point pins and attached at the other end to a link member. The link member has a pin adapted to slide within a retaining groove or slot in the chair control housing and is connected to the chair pivot point with a tension spring. The lever arm, link and tension spring supply a restoring force which when coupled to the torque force produced by the main spring, results in a restoring force that is nonlinear and is comfortable to the user for all positions of the chair.
41 Citations
9 Claims
- 1. A chair tilt control for a chair comprising a chair control housing mounted on a chair base, a chair seat support member pivotally attached to the forward portion of said chair control housing by pivot means, a main spring member secured to said chair control housing and adapted to resist the pivotal movement of said seat support member, a first lever arm having one end thereof attached to said pivot means and the other end thereof pivotally attached to one end of a first link member, the other end of said link member having a link pin adapted to slide within a link pin retaining groove formed in said chair control housing, and a first tension spring extending between said pivot means and said link pin.
Specification