Semi-automatic pneumatic expansion rivet gun

Details Semi-automatic pneumatic expansion rivet gun Semi-automatic pneumatic expansion rivet gun

1983-08-10

1985-08-20

Bell, Paul A.

Elongated-member-driving apparatus

With means to head member

Heading tool extends within hollow portion of member

72391, 29511, 227120, 227130, 227156, B21J 1502

Patent

active

045359253

ABSTRACT:
A semi-automatic hand-held pneumatic gun for installing plastic rivets. The gun includes a handle equipped with a manual trigger, and an associated magazine which serially feeds a plurality of stored rivets. Repetitive semi-automatic cycling of the gun is established by cooperation between a triggered air system, an intermediate pneumatic system, and a pneumatic barrel assembly. The trigger valve establishes a plurality of pneumatic pathways between it a manifold and the intermediate pneumatic system, activating first and second intermediate valves disposed within the intermediate valve pneumatic chamber. The barrel chamber includes an elongated ram and an associated piston. When the trigger valve is in a rest position, a pneumatic path is established whereby the first intermediate valve is biased to a rest position establishing another pneumatic path biasing the piston to a rest position. When the trigger valve is pulled, it establishes another pneumatic path, coupled to the intermediate pneumatic chamber which displaces the second intermediate valve to direct high pressure air to the rear of the barrel chamber, thereby forcing the piston forwardly to contact a plunger within the ram to install a rivet. The trigger valve establishes additional pneumatic paths when released, returning the second intermediate valve to the rest position. However, at this time the first intermediate valve returns the piston to rest, and urges the ram rearwardly. When moving rearwardly within the barrel chamber the ram establishes an air path which returns the first intermediate valve to rest.

REFERENCES:
patent: 3638532 (1972-02-01), Novak
patent: 3758241 (1973-09-01), Eheim
patent: 4089099 (1978-05-01), Nivet
patent: 4131009 (1978-12-01), Hara et al.
patent: 4183239 (1980-01-01), Stubbings
patent: 4222304 (1980-09-01), Yoshida et al.
patent: 4259858 (1981-04-01), Freeman et al.
patent: 4364506 (1982-12-01), Schneider
patent: 4448338 (1984-05-01), Graf et al.

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