Breakstem fastener installation tool

Details Breakstem fastener installation tool Breakstem fastener installation tool

1989-02-24

1990-05-15

Jones, David

Metal deforming

By relatively movable offset tool-faces

With tool motion in fixed path

7245317, B21J 1534

Patent

active

049246917

ABSTRACT:
A breakstem rivet installation tool includes a jaw mechanism (12) for gripping the stem of a rivet, and a pneumatically actuated piston and cylinder device (13) for applying pulling force to the jaw mechanism. It is provided with a damping valve (22) for damping the flow of air from the piston and cylinder device (13) when the force is suddenly released on breaking of a rivet stem (23), thereby to reduce mechanical shock to the tool, and noise of fast-escaping air. The damping valve (22) comprises a resilient steel circular disc (32) which is secured at its center to the apex of a domed member (28) provided with vent holes (26). The undeformed shape of the disc (32) is flat. When, in use of the tool, a rivet stem breaks and the restraining force on the piston (15) is released, the velocity of air flow past the disc (32) urges the disc to bend towards the domed surface of the member (28), thereby restricting the air flow through the vents (26). It may be that the valve closes completely, so that the peripheral edge (36) of the disc (32) contacts the annular valve seat (37) surrounding the air vents (26).

REFERENCES:
patent: 4050285 (1977-09-01), Bosch et al.
patent: 4454746 (1984-06-01), Schwab
patent: 4815310 (1989-03-01), Summerlin et al.

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