Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1989-12-04
1991-09-03
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 725, 324158F, 439482, G01R 102, G01R 104
Patent
active
050457802
ABSTRACT:
An electrical test probe comprises an outer barrel, and a plunger extending axially through the barrel and having an outer portion extending through an open end of the barrel and terminating in a contact tip outside the barrel for contact with a test point. The plunger is supported within the barrel by spring pressure for allowing spring biased relative axial motion between the plunger and the barrel. The plunger is rotatable about its axis during relative axial motion between the plunger and barrel against the bias of the spring so that rotation of the plunger causes enhanced contact between the probe and a test point on a circuit board under test. The contact tip comprises a head having a substantially continuous outer blade edge extending around a periphery of the head and positioned thereon to engage the test point on the board, and at least one further substantially continuous inner blade edge inside the outer blade edge and positioned preferably concentrically with respect to the outer blade edge also for contact with the test point on the board. The inner and outer blade edges are able to spin about the axis of the plunger during their contact with the test point without causing the plunger to bind in the barrel as the head is rotated during contact with an irregularly shaped test point on the board.
REFERENCES:
patent: 3861770 (1975-01-01), Horak
patent: 4105970 (1978-08-01), Katz
patent: 4116523 (1978-09-01), Coberly et al.
patent: 4686465 (1987-08-01), Kruger
patent: 4740746 (1988-04-01), Pollock et al.
patent: 4761146 (1988-08-01), Sohoel
"Test Probe having Concave Tip with Pointed Nipple", by Jakubowski, West. Elec. Tech. Aug., #40, 10/75, pp. 11-12.
"Spring Plunger Contact", by Buyck et al., IBM Tech. Proc. Bull., vol. 15, #1, 6/72, p. 58.
"Pad Deformation Contactor", by Byrnes et al., IBM Tech. Proc. Bull., vol. 21, #11, 4/79, pp. 4511-4512.
Ostby & Barton Co., Drawing No. 110684 (one page), 6/76.
Burns William J.
Everett/Charles Contact Products, Inc.
Wieder Kenneth A.
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