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:
Dec. 16, 2014
Filed:
Dec. 21, 2011
Applicants:
Takuya Uemura, Hirakata, JP;
Yasuhiko Takeuchi, Katano, JP;
Takashi Noda, Hirakata, JP;
Inventors:
Assignee:
Komatsu Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16D 31/00 (2006.01); B66C 23/44 (2006.01); B66D 1/44 (2006.01); F16L 1/028 (2006.01); F15B 21/04 (2006.01);
U.S. Cl.
CPC ...
B66C 23/44 (2013.01); B66D 1/44 (2013.01); F16L 1/028 (2013.01); F15B 21/042 (2013.01); Y10S 60/905 (2013.01);
Abstract
A warm-up pilot pressure control unit adjusts pilot pressure inputted to a first flow channel open/close unit so that the flow channel open/close unit is switched to an open state when a warm-up start state is entered under the necessary condition that a first winch operation member is in a neutral position. When the first flow channel open/close unit is in the open state, a first pump displacement adjustment unit adjusts the displacement of a first hydraulic pump so that the differential pressure between a first pump hydraulic circuit and a first warm-up hydraulic circuit becomes constant at a predetermined set pressure.