Fluid actuated, double acting machine for punching, cutting, bending or the like
US5282378A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 2, 1992 |
| Grant date | Feb 1, 1994 |
| Priority date | — |
| Expiry date | Sep 2, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/53226
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A hydraulic punching machine is disclosed which has a casing having formed therein a piston chamber in which a piston is reciprocably mounted to define a pair of opposed fluid chambers, and a fluid reservoir for containing a hydraulic fluid. The piston has a piston rod carrying a punch for movement into and out of engagement with a die on the casing. Also mounted to the casing is a motor driven pump for pressurizing the fluid. A solenoid actuated spool valve alternately places the fluid chambers in communication with the pump and with a fluid drain. The solenoid is connected to an electric control circuit capable of sensing the extension and contraction of the piston rod. Therefore, upon extension of the piston rod, with the consequent creation of a punch in the work such as sheet steel, the control circuit cases the spool valve to automatically contract the piston rod under fluid pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.