Clamping apparatus
US5174554A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 11, 1992 |
| Grant date | Dec 29, 1992 |
| Priority date | — |
| Expiry date | Jun 11, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B5/061
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A first piston (11) is inserted into a second piston (12) within a housing (4). An acting point portion (A), a fulcrum portion (C) and a wedge type pressure receiving surface (B) are provided in the first piston (11) in order from front side. A first swing gap (37) and a second swing gap (38) are provided in a space below the front portion of the first piston (11) and in a space above the rear portion thereof respectively. The second piston (12) is provided with a pushing surface (F) facing the pressure receiving surface (B) from below. At the time of clamping, by a fluid pressure within a first actuation chamber (21) both the pistons (11) (12) are advanced and after that the second piston (12) is advanced relative to the first piston (11). Thereupon, the acting point portion (A) is swung downwardly about the fulcrum portion (C).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.