Machine element or mechanism – Control lever and linkage systems – Foot operated
Patent
1989-12-11
1992-07-21
Luong, Vinh T.
Machine element or mechanism
Control lever and linkage systems
Foot operated
745015B, 74575, 188 2D, 188265, G05G 114, F16D 6900
Patent
active
051312883
ABSTRACT:
A park brake assembly (20) provides a hand or foot operated park brake actuator (30) connected to a drive reel (48) via a flexible motion transmitting core element (68). The drive reel (48) is connected to an isolator crank (56) via a lost motion connection (46). The isolator crank (56) is operatively connected to a control crank (76) which, in turn, directly actuates the park brake (26). The control crank (76) includes a lock sector (102) which coacts with a pawl (104) to selectively maintain the park brake (26) in a brake applied condition. When in the brake applied condition, the lost motion connection (46) allows the drive reel (48) to return to an unactuated position thereby eliminating all stresses from the actuator (30). The pawl (104) includes an elongated slot (108) and a trip spring (110) which coact to alternatively ratchet the pawl (104) against the lock sector (102) and then to disengage the pawl (104) from the lock sector (102) without requiring an independent release mechanism.
REFERENCES:
patent: 3815713 (1974-06-01), Dietrich
patent: 4076093 (1978-02-01), Mizuno
patent: 4596426 (1986-06-01), Clapp
patent: 4696222 (1987-09-01), Han
patent: 4795002 (1989-01-01), Burgei et al.
patent: 4838109 (1983-06-01), Stewart
patent: 4850455 (1989-07-01), Nuti
patent: 4873824 (1989-10-01), Cox
Dura Mechanical Components, Inc.
Greenlee David A.
Luong Vinh T.
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