Height adjustment mechanism for chair backrest or arm

Details Height adjustment mechanism for chair backrest or arm Height adjustment mechanism for chair backrest or arm

2001-06-28

2001-11-13

Brown, Peter R. (Department: 3636)

Chairs and seats

Armrest

Adjustable to multiple use positions relative to bottom or back

Reexamination Certificate

active

06315362

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to mechanisms for adjusting components of a chair relative to one another, and more particularly to an improved height adjustment mechanism for chair backrest or arm.
BACKGROUND OF THE INVENTION
Conventional height adjustment mechanisms for backrest or arm of a chair are strength dependent and require considerable effort on the part of user to achieve positioning. Further, such prior mechanisms are typically complex in constructions, difficult to assemble, trouble-prone, unreliable, and unsightly. Thus, it is desirable to provide a new and improved height adjustment mechanism for chair backrest or arm in order to overcome the above drawbacks of prior art.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an adjustment mechanism mounted in a chair for releasably locking one chair component in any one of a plurality of positions relative to a seat of the chair. The adjustment mechanism comprises a tube-like brace having one end secured to underside of the seat; a sliding member slideable in the brace having an upper end secured to one chair component, a lower opening, and a plurality of longitudinally disposed recesses; a guide member coupled to the lower opening of the sliding member; a hook member having a lower end coupled to the guide member and an upper bent end; a first half-cylindrical member secured in the brace including an internal notched member having a plurality of curved members each including a first curve, a stop, and a second curve, and a longitudinal channel in communication with the curved members; and a second half-cylindrical member secured in the brace matingly snapped with the first half-cylindrical member for receiving the sliding member and the hook member, the second half-cylindrical member including a lower hole, a spring-loaded detent having a portion projected from the lower hole into one of the recesses for engaging with the sliding member and other remaining portions concealed in the lower hole in an unused state of the adjustment mechanism, and a fastener secured in the lower hole to compress the spring-loaded detent; wherein one chair component is operative to push down to cause the bent end to move through the channel in response to a disengagement of the detent from the recess and pull up to lock in one of the curved members with the detent engaged with one of the recesses.
In one aspect of the present invention, the fastener is a thumb screw.
In another aspect of the present invention, the detent comprises a steel ball releasably engaged with one of the recesses.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.


REFERENCES:
patent: 5265938 (1993-11-01), Melhuish et al.
patent: 5597204 (1997-01-01), Karaus, Jr.
patent: 5895095 (1999-04-01), Chen
patent: 6209961 (2001-04-01), Chen

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