Adjustable chair for aircraft and the like
First Claim
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1. An adjustment mechanism for a chair to permit horizontal and swiveling movement of the chair, comprising:
- (a) a base including a top plate member, said top plate member being provided with a central opening;
(b) a rigid seat forming the bottom of said chair, said seat being formed with an opening;
(c) bearing means interposed between the bottom of said seat and the top of said top plate of said base to permit horizontal or swiveling movement of said seat, and thus said chair, relative to said base;
(d) a center post connected to said seat and extending downwardly through said openings in said seat and said top plate of said base, said central opening in said top plate being sufficiently large to accommodate longitudinal and trasverse movement of said post and thus of said seat;
(e) a shaft positioned within said post for vertical movement within said post;
(f) brake means supported on the bottom of said shaft and adapted to tightly frictionally engage the top plate of said base for locking the seat in its adjusted position, said brake means including a lower brake plate and an upper brake plate, said lower brake plate being connected to said shaft for movement therewith, said upper brake plate being positioned between said lower brake plate and said top plate, said upper brake plate being formed with a generally central opening sufficiently large to accommodate longitudinal and transverse movement of said post and shaft, said central opening of said upper brake plate being smaller than said opening of said top plate member and said upper brake plate being dimensioned to overlap both the lower brake plate and the top plate;
(g) eccentric cam means operatively engaging the upper end of said shaft, and(h) means operatively connected to said cam means for rotating the same for vertically moving said shaft to release said brake means, and resilient means for thereafter returning said cam means to its original position again locking the seat, in its adjusted position, to said base.
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Abstract
An adjustment mechanism for an aircraft chair in which the chair can be easily and automatically locked in its adjusted or upright position, and unlocked for horizontal swiveling movement. Rotatable cam means are oriented in a locking position such that the chair seat is locked against the base. When the cam means is rotated the brakes are unlocked thereby permitting horizontal or swiveling movement of the chair seat relative to the base.
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Citations
11 Claims
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1. An adjustment mechanism for a chair to permit horizontal and swiveling movement of the chair, comprising:
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(a) a base including a top plate member, said top plate member being provided with a central opening; (b) a rigid seat forming the bottom of said chair, said seat being formed with an opening; (c) bearing means interposed between the bottom of said seat and the top of said top plate of said base to permit horizontal or swiveling movement of said seat, and thus said chair, relative to said base; (d) a center post connected to said seat and extending downwardly through said openings in said seat and said top plate of said base, said central opening in said top plate being sufficiently large to accommodate longitudinal and trasverse movement of said post and thus of said seat; (e) a shaft positioned within said post for vertical movement within said post; (f) brake means supported on the bottom of said shaft and adapted to tightly frictionally engage the top plate of said base for locking the seat in its adjusted position, said brake means including a lower brake plate and an upper brake plate, said lower brake plate being connected to said shaft for movement therewith, said upper brake plate being positioned between said lower brake plate and said top plate, said upper brake plate being formed with a generally central opening sufficiently large to accommodate longitudinal and transverse movement of said post and shaft, said central opening of said upper brake plate being smaller than said opening of said top plate member and said upper brake plate being dimensioned to overlap both the lower brake plate and the top plate; (g) eccentric cam means operatively engaging the upper end of said shaft, and (h) means operatively connected to said cam means for rotating the same for vertically moving said shaft to release said brake means, and resilient means for thereafter returning said cam means to its original position again locking the seat, in its adjusted position, to said base. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification