Flange lock
US4541256A · kind A · utility
Inventor
Key dates
| Filing date | Jan 31, 1983 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | Jan 31, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7921
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A flange lock for preventing unauthorized access to flanged connections, comprises a pair of semi-cylindrical shells having face plates at at least one end thereof. The shells are hingedly interconnected by a tongue on one that passes through a slot in the other. At their free ends, the shells carrying three sleeves that align with each other in the closed position of the device, two sleeves on one shell and a third sleeve that fits between the first two, on the other shell. A screw-threaded nipple passes through two of the aligned sleeves in the closed position and is screwed into the end sleeve; and a screw type cam lock has a rod that passes through the nipple and screws into a plug carried by the end sleeve. The cam lock is non-rotatable relative to the nipple but its rod can be rotated to screw into and unscrew from the plug, thereby respectively to lock and release the assembly, when a key is inserted in the cam lock. The sleeves are carried by outwardly inclined plates thereby to increase the available space within the shells.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.