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:
Sep. 04, 2007
Filed:
Dec. 07, 2005
Nobuhiko Ichiki, Tsuchiura, JP;
Mitsuhisa Tougasaki, Tsuchiura, JP;
Kaoru Endo, Kiryu, JP;
Hiroyasu Masubuchi, Kiryu, JP;
Nobuhiko Ichiki, Tsuchiura, JP;
Mitsuhisa Tougasaki, Tsuchiura, JP;
Kaoru Endo, Kiryu, JP;
Hiroyasu Masubuchi, Kiryu, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A joystick for an electro-hydraulic control system is provided with a rotary potentiometer having a pivotable arm. This pivotable arm is integrally arranged on a rotary shaft and pivots responsive to pivotal control of a joystick in a predetermined direction or a direction opposite to the predetermined direction. The joystick is also provided with a torsion coil spring for normally holding the pivotable arm in a neutral position, a pin arranged on the pivotable arm and capable of expanding the torsion coil spring upon pivotal movement of the pivotable arm, a holding pin for holding the torsion coil spring at its coil portion, and a cover member having a pair of guide portions for limiting movements of the coil portion of the torsion coil spring in the predetermined direction and the opposition direction when the torsion coil spring is in its neutral position.