Brakes – Vehicle
Patent
1993-09-15
1994-10-18
Butler, Douglas C.
Brakes
Vehicle
188265, 188 74, B60T 104, A61G 500
Patent
active
053559770
ABSTRACT:
The parking brake can be fitted to the wheelchair frame largely regardless of the nominal position of the brake element, and conversely the position of the brake element can be exactly matched to the position of the rear wheel. A two-piece clamp connects a cylindrical bearer to a part of the wheelchair frame and allows the bearer's rotation and lengthwise displacement relative to the frame. One end of the bearer holds the pivoting brake element and locking lever. One arm of the locking lever acts together with the brake element and has two recesses. When the locking lever is moved to a released position, spring action forces the brake element to engage one of the recesses and to be located beside the rear wheel approximately perpendicular to the wheel's rotational axis. When the locking lever is moved to a braking position, the brake element engages the second recess and is located more or less parallel to the rotational axis of the rear wheel. This ensures that the brake element moves accurately to clearly defined end positions.
REFERENCES:
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patent: 4570756 (1986-02-01), Minnebraker et al.
patent: 4589525 (1986-05-01), Phipps et al.
patent: 4682783 (1987-07-01), Kuschall
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patent: 4749064 (1988-06-01), Jinno et al.
patent: 4852697 (1989-08-01), Kulik
patent: 4887830 (1989-12-01), Fought et al.
patent: 5197577 (1933-03-01), Hayek
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