Bellows pneumatic system

Details Bellows pneumatic system Bellows pneumatic system

1989-03-20

1989-11-28

Garrett, Robert E.

Expansible chamber devices

Bellows type expansible chamber

92 47, 264506, 264526, 425536, F01B 1900, F16J 304, B29C 4300

Patent

active

048829781

ABSTRACT:
A pneumatic system (10) is shown in its most preferred use in a spray gun (12) to remotely control a pressure washer. The system (10) generally includes an integrally formed, homogenous squeeze box (40) including a location ear (52), a nose tube (46), a bellows (44), and a discharge tube (48). Bellows (44) is generally rectangular in cross section and includes a flat top (62) and bottom (63) and accordion sides (64) having generally longitudinal fold lines (72, 74, 76, 78, 80) which are generally parallel to the mold part line (93) and the tubes (46, 48) but include a 2.degree. draft for ease in mold removal. A valve and spring tube (42) is loosely received on the nose tube (46) for sealing a vent hole (60) provided therein when the bellows (44) is compressed by a trigger (30) of gun (12) and for biasing the trigger (30) to an uncompressed bellows condition. In its most preferred form, the squeeze box (40) is blow molded, with the bellows cavities (44') of the mold halves (92, 94) having a generally trapezoidal cross section defining major longitudinal undercuts (102).

REFERENCES:
patent: 3606623 (1971-09-01), Aymar
patent: 4644980 (1984-08-01), Yoshida
Steere Enterprises, Inc., Blow Molded Bellows, 1982.

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