Diaphragm pump
US4392787A · kind A · utility
9Cited by
12References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1981 |
| Grant date | Jul 12, 1983 |
| Priority date | — |
| Expiry date | Jan 21, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B43/067
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A diaphragm pump having a reciprocating piston, a rotatable cam canted and engaging the piston, and a diaphragm secured to a plunger stem by a screw rotatable relative to the stem. The plunger stem extends into a bore in the piston, the piston bore and plunger stem having a matching configuration preventing rotation of the plunger stem relative to the piston when the diaphragm securing screw is loosened. The piston end engaging the cam is formed as a spherical section positioning the line of engagement with the cam closely adjacent the axial center of the piston, to reduce side thrust.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.