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:
Jul. 22, 1986
Filed:
May. 23, 1985
Nikolaus Berchtold, Zurich, CH;
Maag Gear-Wheel & Machine Company, Ltd., Zurich, CH;
Abstract
The gear tooth test feeler contains a sensing lever pivotally journalled in a carrier member by means of a cross-spring joint. The cross-spring joint generates a counter-force which increases in proportion to the angular deflection of the sensing lever. Two rocking levers are arranged on opposite sides of the sensing lever. The two rocking levers are positioned between the carrier member and the sensing lever by further pivot bearings and stop members such that the rocking levers maintain the sensing lever in a central position and such that the sensing lever entrains one of the rocking levers whenever the sensing lever deflects while the other rocking lever retains its initial position and vice-versa. Two permanent magnets fastened to the sensing lever exert a magnetic force of attraction upon each of the ferrous rocking levers. When the sensing lever deflects, one of the permanent magnets moves away from its associated rocking lever, so that the magnetic force of attraction exerted upon the rocking lever diminishes. The algebraic addition of this diminishing magnetic force of attraction and the increasing counter-force of the cross-spring joint produces a constant contact pressure of a feeler tip of the sensing lever against a gear tooth flank being sensed throughout its deflection displacement path. The sensing lever is deflectable out of its central position in both directions without requiring a switching operation for selectively sensing right hand and left hand gear tooth flanks.