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:
Sep. 23, 1997
Filed:
Jul. 20, 1995
Applicant:
Inventor:
David Collingwood, Stonehouse, GB;
Assignee:
Renishaw plc, Gloucestershire, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B / ;
U.S. Cl.
CPC ...
33558 ;
Abstract
A trigger probe 10 has electrical contacts which open when the probe contacts a workpiece. This is detected by a comparator 17 to produce a trigger signal. If spurious signals are generated at the probe contacts as a result of vibration, these are filtered out by a capacitor C1, which charges up when the contacts open and introduces a time delay. When the probe contacts re-close after a normal trigger operation, the capacitor C1 is discharged through a discharge circuit, e.g. transistor TR1, so that the energy stored on the capacitor does not damage the probe contacts.