Pivot assembly

This invention relates to a pivot assembly and to a chair control incorporating a pivot assembly.

It is known to slidably mount a slide plate to the seat plate of a chair control to allow the user to change the relative position of a chair seat, which is attached to the slide plate, to the seat plate. In a known arrangement, a U-shaped member is pivotably mounted to either side of the slide plate with the free ends of the U-shaped member received in racks which form part of the seat plate. The U-shaped member is spring biased so that the free ends are urged into the racks, thereby fixing the relative position of the slide plate and seat plate. If the U-shaped member is pivoted by a user against this spring pressure, the free ends leave the racks, freeing the slide plate to slide with respect to the seat plate. When a desired position is achieved, the U-shaped member may be released whereupon the free ends of the member will re-enter the racks and lock the slide plate in this new relative position with respect to the seat plate.

The U-shaped member is pivotably mounted to the slide plate by a pair of pivots, each of which has an attachment portion which attaches to the U-shaped member. A pop rivet may be received through a hole in a pivot and through the slide plate in order to pivotably affix the pivot to the slide plate.

This invention seeks to provide an improved pivot assembly.

In accordance with this invention, there is provided a pivot assembly with a pivot support member having a keyway. The keyway has two oppositely directed longer keyway wings extending from a middle section and the middle section has two oppositely directed shorter keyway wings extending in a direction transverse to that of the longer keyway wings. The shorter keyway wings have convexly radiused ends. The pivot assembly also has a pivot with an attachment portion and a key projecting rearwardly from the attachment portion. The key has a rearward section with oppositely directed longer key wings which are longer than the shorter keyway wings but sufficiently short to allow the longer key wings to pass through the keyway. The key also has a middle section between the rearward section and the attachment portion. The middle section has oppositely directed shorter key wings with convexly radiused ends. The shorter key wings extend in a direction aligned with that of the longer key wings. The shorter key wings have a length substantially matching that of a length of the shorter keyway wings. The radiused end of each shorter key wing has a radius substantially matching a radius of a radiused end of each of the shorter keyway wings such that the shorter key wings fit with a close tolerance between ends of the keyway shorter wings.

Other features and advantages will be apparent from the following description in conjunction with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In the figures which illustrate an example embodiment of the invention,

FIG. 1 is a perspective view of a chair control,

FIG. 2 is a partially assembled fragmentary perspective view of the chair control of FIG. 1,

FIG. 2A is a fragmentary side view of a portion of FIG. 2,

FIG. 2B is a side view of a portion of FIG. 2,

FIG. 3A is a partially assembled fragmentary perspective view of the chair control of FIG. 1,

FIG. 3B is a cross-sectional view along the lines 3B-3B of FIG. 3,

FIG. 4A is a partially assembled fragmentary perspective view of the chair control of FIG. 1,

FIG. 4B is a cross-sectional view along the lines 4B-4B of FIG. 4,

FIG. 5 is a partially exploded perspective view of the chair control of FIG. 1,

FIGS. 6A to 6E are schematic side views of the chair control of FIG. 1 illustrating its operation.

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Previous Patent Application:
Mechanism for an office chair
Next Patent Application:
Longitudinal displacement device for a motor vehicle seat
Industry Class:
Chairs and seats

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