Chair seat tilting mechanism
First Claim
Patent Images
1. A chair seat tilting mechanism comprising:
- a support for mounting to a chair spindle;
a lever arm for mounting to a chair seat, said lever arm pivotally mounted at a pivot mount to said support such that, when said lever arm is mounted to said chair seat, pivoting said lever arm about said lever arm pivot mount tilts said chair seat forwardly;
a link arm pivotally mounted to said support at a pivot mount, said link arm having a camming end located at one side of said link arm pivot mount such that said camming end is positioned for camming said lever arm at a point between said lever arm pivot mount and said link arm pivot mount, said link arm for supporting a chair back at a side of said link arm pivot mount which is opposite from said one side such that when said chair back is tilted backwardly, said camming end is raised thereby pivoting said lever arm about said lever arm pivot mount in order to tilt said chair seat forwardly.
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Abstract
A chair seat tilting mechanism comprises a support for mounting to a chair spindle and a lever arm pivotally mounted at a pivot to the support, which lever arm is for mounting to a chair seat. A link arm is pivotally mounted at a pivot to the support and has a cam with a camming end positioned between the lever arm pivot mount and the link arm pivot mount. An extension of the link arm mounts to a chair back such that when a chair occupant leaning back on the chair back, the link arm pivots about the link arm pivot causing the cam to cam lever arm so that it pivots about its own pivot with the support. This results in the chair seat tilting forwardly.
32 Citations
8 Claims
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1. A chair seat tilting mechanism comprising:
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a support for mounting to a chair spindle; a lever arm for mounting to a chair seat, said lever arm pivotally mounted at a pivot mount to said support such that, when said lever arm is mounted to said chair seat, pivoting said lever arm about said lever arm pivot mount tilts said chair seat forwardly; a link arm pivotally mounted to said support at a pivot mount, said link arm having a camming end located at one side of said link arm pivot mount such that said camming end is positioned for camming said lever arm at a point between said lever arm pivot mount and said link arm pivot mount, said link arm for supporting a chair back at a side of said link arm pivot mount which is opposite from said one side such that when said chair back is tilted backwardly, said camming end is raised thereby pivoting said lever arm about said lever arm pivot mount in order to tilt said chair seat forwardly. - View Dependent Claims (2, 3, 4, 5)
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6. A chair having a seat tilting mechanism, comprising:
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a support mounted to a chair spindle; a lever arm mounted to a chair seat, said lever arm pivotally mounted at a pivot mount to said support such that pivoting said lever arm about said lever arm pivot mount tilts said chair seat forwardly; a link arm pivotally mounted to said support at a pivot mount, said link arm having a camming end located at one side of said link arm pivot mount such that said camming end is positioned for camming said lever arm at a point between a said lever arm pivot mount and said link arm pivot mount, said link arm supporting a chair back at a side of said link arm pivot mount which is opposite from said one side such that when said chair back is tilted backwardly, said camming end is raised thereby pivoting said lever arm about said lever arm pivot mount in order to tilt said chair seat forwardly. - View Dependent Claims (7, 8)
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Specification