Measuring and testing – Vibration – Loose object detection
Patent
1987-03-16
1989-09-05
Chapman, John
Measuring and testing
Vibration
Loose object detection
73 12, 73761, 73663, G01N 336
Patent
active
048627461
ABSTRACT:
A vibration tester for measuring the looseness of thread connections is disclosed which comprises a support frame, a specimen holding section mounted in the support frame and a pair of pneumatic hammers mounted at both ends of the specimen holding section. The specimen holding section consists of a largely cylindrical shaped hollow holder, a strain gauge provided and attached to the gauge carrier for measuring the looseness of specimens, a vibrating plate mounted on the hollow holder in contact with the pneumatic hammers in such a manner as to be subjected to blows from the pneumatic hammers, and a guide mechanism adapted to guide the direction of pneumatic hammer blows. With this arrangement, the pneumatic hammers are activated to deliver impacts to the vibrating plates, with the bolt making up the specimen set on the tester by being inserted through the gauge carrier, hollow holder and vibratory plate, with the nut tightened to the protruding end of the bolt. The looseness of the specimen occurring as a result of such blows is read on the strain gauge. The tester of this invention is capable of testing all types of thread connections, whatever size they may be of, with increased reliability.
Chapman John
Jaskiewicz Edmund M.
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