Title:
NAGATIVE BRAKE DEVICE, CONSTRUCTION MACHINE, AND METHOD OF ACTIVATING NEGATIVE BRAKE
Document Type and Number:
WIPO Patent Application WO2004069729
Kind Code:
B1
Abstract:
A negative brake device has a hydraulic-pressure source (23), a pressure-reducing valve (22) for reducing pressure from the hydraulic-pressure source (23) so that a secondary pressure (P) is increased as the push-in amount of a pusher (25) increases, a negative brake mechanism (10) for releasing a brake by the secondary pressure (P) from the pressure-reducing valve (22) and activating the brake by shutting off the secondary pressure (P), a brake pedal (24) provided such that the pusher (25) is pulled out in accordance with the stepping on the pedal, and a spring member (27) for pushing in the pusher (25), wile the brake pedal (24) is not being operated, so as to release the brake actuated by the negative brake mechanism (10).
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Inventors:
HONJOU KOUHEI (JP)
DATE KENICHIROU (JP)
HOSHINO HIROYUKI (JP)
DATE KENICHIROU (JP)
HOSHINO HIROYUKI (JP)
Application Number:
PCT/JP2004/001171
Publication Date:
November 11, 2004
Filing Date:
February 05, 2004
Export Citation:
Assignee:
HITACHI SUMITOMO HEAVY IND CONSTRUCTION CRANE CO LTD (JP)
HONJOU KOUHEI (JP)
DATE KENICHIROU (JP)
HOSHINO HIROYUKI (JP)
HONJOU KOUHEI (JP)
DATE KENICHIROU (JP)
HOSHINO HIROYUKI (JP)
International Classes:
B66D1/44; B66D5/26; F16D55/40; (IPC1-7): B66D5/26
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