Patent ID: 6969792
Filing Date: 2005-11-29
Classification: A47B

Abstract:
1. A self-locking keyboard bracket, comprising: a base frame, comprising at least one side wing, each side wing of said base frame comprising a first axle hole and a second axle hole; a connecting frame, comprising at lest one side wing, each side wing of said connecting frame comprising a first axle hole disposed near one end thereof and a second axle hole disposed near an opposite end thereof; a coupling frame, comprising at least one side wing, each side wing of said coupling frame comprising a first axle hole and a second axle hole; a supporting frame, comprising at least one side wing, each side wing of said supporting frame comprising an axle hole and a smoothly arched sliding slot; a braking mechanism, comprising at least one link, at least one beveled guide block, and a first sleeve, each said link comprising a first axle hole transversely extended through a first end thereof, a beveled block fixedly provided at a second end thereof, and a second axle hole transversely extended through said beveled block and said second end, each said beveled guide block comprising a coupling groove disposed at one side and coupled to the beveled block of the second end of one said link and an axle hole transversely extended through said coupling groove; a first pivot pin mounted in the axle hole in each downward side wing of said supporting frame, the first axle hole in each downward side wing of said coupling frame and the first axle hole in each downward side wing of said connecting frame to pivotally secure said supporting frame, said coupling frame and said connecting frame together; a second pivot pin mounted in the first axle hole in each downward side wing of said base frame and the second axle hole in each downward side wing of said connecting frame for enabling said connecting frame to be turned relative to said base frame; a third pivot mounted in the third axle hole in each downward side wing of said coupling frame and the first axle hole of each said link of said braking mechanism to pivotally couple said braking mechanism to said coupling frame; a fourth pivot pin mounted in the second axle hole in each downward side wing of said base frame, the axle hole of each said beveled guide block, the second axle hole of each said link and said first sleeve to pivotally secure said braking mechanism to said base frame, allowing relative swivel motion between said braking mechanism and said base frame; and an angle adjustment control unit, comprising an axle inserted through the smoothly arched sliding slot in each downward side wing of aid supporting frame and the second axle hole in each downward side wing of said coupling frame, said axle having a first end and a second end, a fastening device fastened to the second end of said axle and stopped against one side of one side wing of said supporting frame, and a locking lever pivoted to the first end of said axle and turnable relative to said axle between a first position to lock said supporting frame to said coupling frame and a second position to unlock said supporting frame from said coupling frame, said locking lever comprising a cam disposed at one end and pivoted to the first end of said axle and stopped at one side of one side wing of said supporting frame opposite to said fastening device.