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:
Apr. 23, 1991
Filed:
May. 01, 1990
Ulf R Langgard, Overland Park, KS (US);
William E Thurston, Gladstone, MO (US);
Interconnect Devices, Inc., Kansas City, KS (US);
Abstract
A spring contact twisting electrical contact spring probe for testing electrical printed circuit boards includes a barrel having a spring seating end and an open end, a compression spring seated in the closed end of the barrel, and a plunger inserted into the barrel. The plunger includes a tail section, connected to a twister section comprising a square rod twisted along its longitudinal axis, and a shaft or probe section that protrudes from the barrel and includes the probe tip. Four crimps in the barrel retain the plunger inside the barrel and interact with the helical crests on the twister section to cause the plunger to rotate along its longitudinal axis as it reciprocates within the barrel. The twister section is retained entirely within the barrel at all times. The rotating plunger tip has edges that scrape off contaminants or coatings on the test sites of the circuit boards to obtain a sufficient electrical connection.