Vacuum holding device
US4718629A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1986 |
| Grant date | Jan 12, 1988 |
| Priority date | — |
| Expiry date | Jun 12, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/60
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A holding device using a vacuum clamp arrangement has a suction box closed by a suction plate having a holding surface provided with a plurality of suction bores extending from the holding surface into the suction box. Each of the suction bores has an enlarged expanded bore portion inwardly spaced from the holding surface to form a valve chamber which valve chamber is closed by an inner section of the suction bore between the chamber and the suction box and each of the valve chambers loosely receives the shaped valve reed which will close the inner section of the suction bore for each of the suction bore arrangements which is not covered by the sheet placed on the holding surface. This simple structure keeps vacuum losses low and, therefore, enables utilizing a relatively small vacuum pump for the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.