The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 22, 2000
Filed:
Feb. 10, 1998
Mitsuru Arai, Oyama, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
An emergency stop apparatus for a hydraulic speed change gear is capable of quickly reducing the pump discharge to zero in order to stop the traveling of a vehicle at the time of an emergency, where the vehicle employs a hydraulic travel drive system, such as in construction equipment, agricultural equipment, etc. The apparatus includes a variable capacity type hydraulic pump (41); a hydraulic motor (43); a travel operating level (59); an intermediate lever, which is connected to the travel operating lever by a wire cable; a servo valve (52); a servo valve input lever (57), which is attached to the servo valve; and an interlock device between the intermediate lever and the servo valve input lever. When the interlock device is engaged, the servo valve input lever is actuated according to the operation of the travel operating lever so as to displace the servo valve in accordance with the operating amount of the travel operating lever to increase or decrease the discharge of the variable capacity type hydraulic pump so as to change the rotational speed of the hydraulic motor. When the interlock device is disengaged, the servo valve input lever is not connected to the intermediate lever. An emergency stop switch can actuate a solenoid valve to pass pressurized oil to a detent means to effect disengagement of the servo valve input lever from the intermediate lever.