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:
Oct. 20, 2009
Filed:
Mar. 09, 2005
Hiroshi Kigawa, Tokyo, JP;
Takaharu Ueda, Tokyo, JP;
Kenichi Okamoto, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
Provided is a braking device for an elevator in which energy required for braking and releasing is reduced. The braking device includes a movable plunger (), braking mechanisms (-) which are connected to one end of the movable plunger and are switched between a braking state and a releasing state by an axial movement of the movable plunger, a first drive mechanism () using mechanical or magnetic force, for reversing the movable plunger in the middle of a movable range in an axial direction for the switching between the braking state and the releasing state to press and hold the movable plunger to the braking side or the releasing side, and a second drive mechanism () using an electromagnetic force, for driving the movable plunger to a reversion position in the middle of the movable range from the braking side or the releasing side against a pressing force of the first drive mechanism in order to switch between the braking state and the release state.