Signals and indicators – Navigation devices
Patent
1976-07-23
1977-09-13
Britts, Ramon S.
Signals and indicators
Navigation devices
116114R, 151 38, F16B 3102
Patent
active
040474631
ABSTRACT:
A one-piece mechanical device for visually indicating the tension in a monitored bolt, such as a mine bolt or the like, is provided. The device comprises a specially configured spring washer, preferably a helical washer, which is inserted in between the head of the monitored bolt and the surface or backing plate against which the head of the bolt will bear for substantially resilient compression therebetween. The washer is selected with a spring constant such that substantial axial compression of the washer will occur only upon the application of a compressive force in the range of tensile forces to monitored in the monitored bolt. Preferably, the washer will only completely flatten between the bolt head and the bearing plate when the compressive force applied thereto exceeds the predetermined maximum tensile force in the bolt. The two adjacent free ends of the washer carry indicia on the outer wall thereof, such as etched or raised lines, easily seen stripes or the like, which will be axially aligned when the tensile force in the bolt is within predetermined limits. The outer circumferential wall of the bolt is of a substantially constant axial length, greater than the axial length of the remainder of the washer, so that the outer circumference of the washer is always the contact surface with both the bolt head and the bearing surface.
REFERENCES:
patent: 903109 (1908-11-01), Ross
patent: 1786503 (1930-12-01), Norwood
patent: 3060731 (1962-10-01), Adise
patent: 3133468 (1964-05-01), Cumming
patent: 3503430 (1970-03-01), Tsurumoto
patent: 3851386 (1974-12-01), Ellzey
Britts Ramon S.
Eaton Corporation
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