Air-hydraulic blind-riveting tool with short reset time

Details Air-hydraulic blind-riveting tool with short reset time Air-hydraulic blind-riveting tool with short reset time

1975-04-21

1977-09-27

Lanham, C.W.

Metal deforming

By relatively movable offset tool-faces

With tool motion in fixed path

91442, 137517, B21J 1534

Patent

active

040502856

ABSTRACT:
An air-hydraulic blind-riveting tool has a chuck which is normally urged into a ready position by a spring and which is drawn into a retracted position by a fluid-operated piston connected via a hydraulic link to an air piston subdividing an air chamber of the tool into a front and a rear compartment. The front compartment is vented to the outside and the rear compartment is connectable via a trigger-operated valve to a source of compressed air. Thus when this rear compartment is pressurized the air piston is displaced forward and the working piston connected to the chuck is retracted. A valve is provided between the rear compartment and the atmosphere which comprises a valve disk displaceable by pressure in the rear compartment against a valve seat to prevent air from leaving the rear compartment but normally urged by a relatively stiff spring away from this valve seat. Thus during pressurization of the rear compartment this valve is closed, but as soon as the pressurization is partially relieved this valve opens and allows quick return of the air piston to the ready position.

REFERENCES:
patent: 123098 (1872-01-01), Goodale
patent: 530442 (1894-12-01), Munger
patent: 934286 (1909-09-01), Cole
patent: 2526956 (1950-10-01), Kugler
patent: 3082898 (1963-03-01), Bosch
patent: 3624769 (1971-11-01), Hansen

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