Method and apparatus for linear braking and chair with linear br

Details Method and apparatus for linear braking and chair with linear br Method and apparatus for linear braking and chair with linear br

1987-02-25

1989-06-27

Chin-Shue, Alvin C.

Supports

Stand

Horizontally movable support surface

248424, 248 1R, F16M 1300

Patent

active

048422347

ABSTRACT:
In one embodiment, the linear brake includes a carriage riding over a threaded rod. A pair of jaws is carried by the carriage and each jaw has a jaw face at one end thereof. The jaw face includes a plurality of spaced jaw recesses that are adapted to mate with the threads on the threaded rod. The fore sections of each jaw face are juxtaposed. Each jaw is adapted to rotate in a plane of engagement. Each jaw has, spaced from the jaw face, a hole normal to the plane of engagement. The carriage includes pivot pins having an outside diameter smaller than the hole such that the jaw recesses move both rotationally and laterally away from the threads on the threaded rod when the brake is released. A spring forces the jaw recesses into the threads on the rod. Counteracting forces, applied by pulling cables, move the jaw faces away from the threads and then partially rotate the faces in the plane of engagement away from the threaded rod thereby allowing linear travel of the carriage along the threaded rod surface. A method for linearly braking the carriage and a chair incorporating the linear brake is also disclosed.

REFERENCES:
patent: 1806014 (1931-05-01), Flintermann
patent: 2758872 (1956-08-01), Solomon et al.
patent: 3330523 (1967-07-01), Nichols
patent: 3661352 (1972-05-01), MacFarlane
patent: 3981473 (1976-09-01), Nagai
patent: 4183493 (1980-01-01), Keutsky
patent: 4233740 (1980-11-01), Bunn et al.
patent: 4645159 (1987-02-01), Terada et al.

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