Tensioning devices

Details Tensioning devices Tensioning devices

1979-11-05

1981-08-04

Zugel, Fraocis K.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Miscellaneous

254 29A, F16B 3506

Patent

active

042815800

ABSTRACT:
A hydraulic nut or washer or bolt head comprises piston means let into the recessed end-face of a body. Means for applying hydraulic pressure to a chamber or chambers behind the body are provided to urge the piston means in a direction which leads out of the end face. The piston means has an overall dimension in a first transverse direction which is less than the least possible overall dimension of an annular piston giving the same piston face area and having an overall dimension in another transverse direction, at right angles to the first, which is less than the least overall major dimension for a pair of opposed circular pistons giving the same piston face area. A sealing member comprising a layer of moulded deformable substantially incompressible material on a former is provided in the chamber to contain the hydraulic fluid.

REFERENCES:
patent: 655685 (1900-08-01), Burley
patent: 2955579 (1960-10-01), Block
patent: 3154006 (1964-10-01), Novak
patent: 3285568 (1966-11-01), Biach
patent: 3556465 (1971-01-01), Little
patent: 3772759 (1973-11-01), Bunyan
patent: 4120230 (1978-10-01), Bunyan

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