Method for pre-stressing bolts for connections, and a device for

Details Method for pre-stressing bolts for connections, and a device for Method for pre-stressing bolts for connections, and a device for

1995-12-08

1998-04-28

Echols, P. W.

Metal working

Method of mechanical manufacture

Assembling or joining

254 29A, 425589, B21D 3900

Patent

active

057429910

ABSTRACT:
In presses for processing plastic materials, pre-stressing of pins (23) stressed by tension is preferably achieved by the use of the hydraulic press device via an auxiliary block instead by means of tightening stop nuts (20). After stressing a pressure plate (22) with a pressure force larger than the maximum operational load, gaps (.DELTA.l) are created between stops (31) on the pins (23) and the pressure plate (22) or counter-support flanges on a hydraulic cylinder. These gaps (.DELTA.l) are bridged in a frictionally connected manner by the adjustment of threaded rings (34), which have been inserted into bores (32) for the pins (23) in the pressure plate (22) or in the hydraulic cylinder. After the pressure plate (22) has been relieved of the pressure force, the required pre-tension is maintained.

REFERENCES:
patent: 3364546 (1968-01-01), Martin
patent: 4259054 (1981-03-01), Savage
patent: 5339512 (1994-08-01), Odsberg et al.

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