Axially adjustable roller assembly

Spring devices – Seat support

Reexamination Certificate

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Details

C384S057000, C248S157000

Reexamination Certificate

active

06264180

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to an improved seat suspension system using a unique roller and channel or guide assembly as part of the suspension system. Typically, seat suspensions use roller assemblies mounted to shafts and adapted to cycle back and forth in metal channels or guides. The roller assemblies are often associated with a scissor arm which, in turn, operates in conjunction with a spring and shock absorber to increase the comfort of the occupant in the seat.
However, due to the difficulty and/or costliness of maintaining manufacturing tolerances or through use and associated wear, the optimal positioning or tolerance between the roller assemblies and their respective guides is often difficult to achieve and maintain. In operation of the seat suspension, a precise tolerance between the two components is desired since unwanted play produces axially movement that accelerates wear and causes potential discomfort to the occupant.
SUMMARY OF THE INVENTION
The present invention provides an axially adjustable roller and guide assembly which allows the optimal position between the two components to be achieved and maintained, and thus, eliminates or minimizes any undesired axial movement. The present invention incorporates on a seat suspension a positionable adjustment member that reduces unwanted play by axially adjusting the spatial distance between the roller and its respective guide by urging one of the two components axially with respect to the other component. The adjustment member may be located in a number of different positions and it is used to achieve a precise tolerance between the two components.
It is, therefore, an object of the present invention to provide a seat suspension assembly in which the axial alignment of a roller with respect to a guide may be adjusted after manufacture in order to place the roller in an optimal position with respect to the guide prior to or during use in order to reduce or eliminate unwanted axial movement or play in the seat.
Another object of the present invention is to provide a seat suspension assembly in which the axial alignment of a roller with respect to a guide may be adjusted after prolonged use of the device in order to maintain and/or reposition the roller in an optimal position with respect to the guide in order to reduce or eliminate unwanted axial movement.
It is another object of the present invention to provide an adjustment member that urges a roller axially with respect to a guide in order to maintain an optimal spatial relationship between the roller and guide.
A further object of the present invention is to provide an adjustment member that urges a guide axially with respect to a roller in order to maintain an optimal spatial relationship between the roller and guide.


REFERENCES:
patent: 2766007 (1956-10-01), Krilanovich
patent: 3265450 (1966-08-01), Aho
patent: 3743229 (1973-07-01), Breitschwerdt et al.
patent: 4747353 (1988-05-01), Watt
patent: 4914712 (1990-04-01), Ikimi et al.
patent: 5118062 (1992-06-01), Archambault
patent: 5348261 (1994-09-01), Nini
patent: 5765802 (1998-06-01), bostrom et al.
patent: 5871198 (1999-02-01), Bostrom et al.

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