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:
May. 26, 2026
Filed:
Nov. 18, 2021
Applicant:
Tadano Ltd., Kagawa, JP;
Inventors:
Yasuhiro Fukumori, Kagawa, JP;
Naoto Kawabuchi, Kagawa, JP;
Assignee:
TADANO LTD., Kagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66C 23/70 (2006.01); B66C 13/20 (2006.01);
U.S. Cl.
CPC ...
B66C 23/705 (2013.01); B66C 13/20 (2013.01); B66C 2700/065 (2013.01);
Abstract
This work machine includes: a first hydraulic cylinder and a second hydraulic cylinder that telescope a telescopic boom on the basis of hydraulic oil supply and discharge, a switching valve that is disposed on a pressure relief circuit for connecting the first hydraulic cylinder and the second hydraulic cylinder to a tank, and a control unit that causes the switching valve to connect the first hydraulic cylinder to the tank and releases the pressure in the first hydraulic cylinder when contracting or extending the second hydraulic cylinder in a condition in which the first hydraulic cylinder is contracted.