Mold plate drive linkage
US4996743A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 29, 1990 |
| Grant date | Mar 5, 1991 |
| Priority date | — |
| Expiry date | Jan 29, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA21C11/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An improved drive linkage for a reciprocating mold plate in a food patty molding machine includes, in series, a hydraulic cylinder and its piston; one is connected to a motor or other prime mover and the other to the mold plate. Three hydraulic lines connect the opposite ends of the cylinder to a large hydraulic reservoir and to each other. A hydraulic pressure flow directing means, preferably comprising check valves in the hydraulic lines, produces a continuous, unidirectional flow of hydraulic fluid from the reservoir into one end of the cylinder, on to the other end of the cylinder, and then back to the reservoir; the flow remains unidirectional despite cyclic reversal of the direction of piston movement in the cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.