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. 01, 2001
Filed:
Mar. 22, 2000
Yoshio Sato, Ayase, JP;
Obara Corporation, Ayashe, JP;
Abstract
A small-sized motor is employed by a driving unit of a welding equipment wherein the inner diameter of a rotary shaft of the motor can be reduced as much as possible, and the entire length of the driving unit is reduced. The driving unit of a welding equipment is provided with a pressure application shaft. The pressure application shaft is driven by a motor including a hollow rotary shaft, a screw shaft fixed inside the rotary shaft, and a nut provided integrally with or substantially integrally with the pressure application shaft, the nut being screwed with a screw provided on the screw shaft. The rotary shaft of the motor is substantially coaxially positioned with the screw shaft. Outer diameters of the nut and pressure application shaft are respectively smaller than an inner diameter of the rotary shaft to form a direct moving guide part. The direct moving guide part is movable on an inner periphery surface of the rotary shaft and a rotary force of the rotary shaft of the motor is converted into a reciprocating motion.