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. 16, 1993
Filed:
Feb. 28, 1991
Jeichienus A van der Werff, Montfoort, NL;
Hadewe B.V., Drachten, NL;
Abstract
A device for controlling the rotation of an element about an axis includes an arrangement for selectively precluding downward rotation of the elements. The arrangement includes a stationary cylindrical member, a wrap spring wrapped around the cylindrical member and a control member mounted on the element. One end of the wrap spring is anchored to the element to prevent downward rotation of the element. The control member is connected to an opposite end of the wrap spring and is movable between first and second positions such that the wrap spring is wrapped tightly about the cylindrical member to prevent downward rotation of the element whenever the control member is in the first position, and such that the wrap spring is wrapped loosely about the cylindrical member to enable rotation of the element whenever the control member is in the second position and whenever the element is rotated in an upward direction.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile