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. 30, 1981
Filed:
Jul. 10, 1980
Rainer von Haas, Geesthacht, DE;
Firma Wilhelm Fette GmbH, Schwarzenbek, DE;
Abstract
The device for measuring the engagement lead of the thread of a screw-like work piece, such as a hob, for example, includes a spindle for rotating the work piece about an axis, a measuring slider movable transversely to the axis and terminated with a feeler which is in sliding contact with a flank of the thread of the work piece whereby the path of movement of the measuring slider is angularly adjustable, a sliding carriage supporting either the measuring slider or the work piece to impart a relative axial displacement therebetween, a tachometer generator coupled to the axially movable sliding carriage to generate a signal proportional to the speed of the axial displacement, a sinusoidal potentiometer mechanically coupled to the measuring slider and to an angle measuring and adjusting device to adjust the angular position corresponding to the base lead angle of the thread of the work piece, the output of the tachometer generator being connected via the sine potentiometer to the electromotor for dirving the measuring slider so that the transverse feed of the latter is proportional to its relative axial displacement whereby the deviations from the preset lead angle are continuously recorded.