Bellows pneumatic system
US4824340A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1988 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Apr 11, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B33/00
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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, homogeneous 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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.