Hydropneumatic gun for setting blind-rivet nuts

Details Hydropneumatic gun for setting blind-rivet nuts Hydropneumatic gun for setting blind-rivet nuts

1988-01-25

1989-04-18

Jones, David

Metal deforming

By relatively movable offset tool-faces

With tool motion in fixed path

72114, 7245317, B21D 3100

Patent

active

048215554

ABSTRACT:
The present invention relates to improvements in a hydropneumatic gun for setting blind-rivet nuts used for integrally securing, for example, two panels to each other with a nut. In the hydropneumatic gun for setting blind-rivet nuts, an air piston fitted in air cylinder is moved to pressurize oil housed in the gun body, causing an oil piston to be retracted, so that a screw mandrel attached to the oil piston at its tip is retracted to the inner part of the gun body, thereby to exert a deforming force to a sleeve of a nut threadedly mounted on the screw mandrel. The hydropneumatic gun for setting blind-rivet nuts comprises an air motor to be rotated by compressed air, an air motor driving air guide passage, an air motor forward/reverse rotation direction changeover mechanism for switching the rotation direction of the air motor, and a power transmission mechanism for transmitting an air motor driving force to the screw mandrel. According to the present invention, a series of operations of the screw mandrel such as forward rotation, stop of the rotation, retraction, reverse rotation and advancement can be carried out smoothly and sequentially.

REFERENCES:
patent: 2583733 (1952-01-01), Fischer
patent: 4559806 (1985-12-01), Schwab
patent: 4612793 (1986-09-01), Klein

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