Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1997-04-10
1998-08-11
Dombroske, George M.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73835, 73786, G01N 302
Patent
active
057929610
ABSTRACT:
A portable fastener tester system for measuring the pullout strength of a fastener that is comprised of an electronic processing unit electrically coupled to a load cell, an optical reader, an opto chopper disc, and a display, a motor having a shaft coupled to a small drive gear which engages a large drive gear, and a tester assembly comprised of a driving member, a case housing, a power nut assembly and a captured nut retained within the power nut assembly. The captured nut is forceably rotated by the motor and engaged small and large drive gears so to foreceably translate the driving member upward through the power nut assembly thereby applying a pulling force on a fastener being tested. The load cell being utilized to transfer the pulling force from the driving member to the fastener, electrically sense the applied force and transmit data to the electronic processing unit for being displayed to the user. The portable fastener tester system providing for a constant rate of travel of the driving member and fastener during testing thereby providing for highly accurate, precise and repeatable measurement results.
REFERENCES:
patent: 3563087 (1971-02-01), Brunnelle et al.
patent: 3792608 (1974-02-01), Holm et al.
patent: 3942368 (1976-03-01), Hoyt
patent: 4217776 (1980-08-01), McCall
patent: 4554838 (1985-11-01), Paus
patent: 4662227 (1987-05-01), Peterson
patent: 4753115 (1988-06-01), Moody
Battery Operated Motorized Digital Fastener Testers, Comten Industries, Jan. 1, 1996.
Series 301W Fastener Testers, Comten Industries no date.
Heeley-Brown Company, Pull-Out Tester no date.
Giebner Christopher S.
Giebner Thomas P.
Matthews Donald K.
Dombroske George M.
Giebner Enterprises, Inc.
Noori Max H.
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