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:
Jun. 14, 1988
Filed:
Sep. 16, 1986
Katsuyoshi Fukaya, Obu, JP;
Takashi Kubota, Aichi, JP;
Aisan Kogyo Kabushiki Kaisha, Obu, JP;
Abstract
A step motor of the linear type is composed of a shaft threadedly engaged with an inner hole provided in a rotor and is driven in the axial direction by rotation of the rotor. A bearing for slidably supporting the shaft for axial movement is installed in a rear cover for covering the rear end of the shaft and an enclosing member for the rear end of the shaft is formed in the rear cover. A spring shoe and a coil spring are fitted to the rear end of the shaft enclosed in the enclosing member. Consequently, the assembly of the coil spring and the spring shoe becomes simple, and the coil spring is not exposed. The form of the front portion of the step motor is made more compact in comparison to that of the prior art where the coil spring is externally installed to the front end of the shaft.