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. 05, 1991
Filed:
Jul. 18, 1989
Yasutaka Gomyo, Toyama, JP;
Akira Ito, Toyama, JP;
Toshiyuki Ishisaka, Toyama, JP;
Tetsurou Miwa, Toyama, JP;
Satoshi Hosokawa, Toyama, JP;
Toshio Fujimori, Tokyo, JP;
Hiroshi Ando, Tokyo, JP;
Seiichi Akizuki, Tokyo, JP;
Katsutoshi Yamaguchi, Tokyo, JP;
Kabushiki Kaisha Fujikoshi, Toyama, JP;
Nissan Motor Sales Co., Ltd., Tokyo, JP;
Abstract
A vibrator has a hydraulic circuit connected with a hydraulic power unit. An electromagnetic valve disposed at the hydraulic circuit is regulated for the time for actuating a switch valve through a control signal. A plunger capable of bearing a load of an object to be tested at an upper end portion thereof has an oil chamber for pressurizing the plunger in such a manner as to be able to move upward and downward. An oil passage communicates with the oil chamber and with the electromagnetic valve. A vibration applying cylinder is capable of vibrating the plunger at a desired amplitude and frequency through hydraulic oil which is fed from the electromagnetic valve. A lift means lifts the vibration applying cylinder to a predetermined height. A controller capable of outputting, as a control signal, a setting signal for setting at least the amplitude and frequency of the plunger is provided. A control unit actuates the hydraulic power unit and the electromagnetic valve in accordance with the control signal.