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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.:

US 4910419 B1

PDFFull Text
Date of Patent:
Mar. 20, 1990

Filed:

Feb. 28, 1989

Overload detection mechanism for motor-driven linear actuator

Applicant:
Inventors:

Shuji Hayashi, Osaka, JP;

Kenichiro Nakamura, Ohtsu, JP;

Assignee:

Tsubakimoto Chain Co., , JP;

Attorney:

Howson & Howson

Primary Examiner:

Patrick R Salce

Assistant Examiner:

Judson H Jones

Int. Cl.
CPC ...
H02K / ; F16D / ;
U.S. Cl.
CPC ...
310 13 ; 310 23 ; 335258 ; 192143 ;
Abstract

In a linear actuator comprising a motor-driven screw shaft, an overload detection mechanism comprises a pair of cup-shaped spring seats with substantially cylindrical portions. The spring seats are mounted at one end of the screw shaft by a pair of bearings and have a spring therebetween under a predetermined preload. Limit switches are provided for detecting overload on the screw shaft as a result of axial movement of the spring seats. The cylindrical portions of the cup-shaped spring seats serve as strikers for said limit switch means.

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Hayashi, Shuji. (1990). Overload detection mechanism for motor-driven linear actuator (U.S. Patent No. 4910419). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4910419

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