Packing seal for cast iron pipe joints
US4546987A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1984 |
| Grant date | Oct 15, 1985 |
| Priority date | — |
| Expiry date | Oct 29, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L17/025
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An annular elastomer packing 2 for a male-female bell housing type of pipe joint has a trapezoidal foot 12 radially opposite an anchor ridge or flange 8 which seats in a mating groove 5 in the housing, and a tapering truncated body portion 10 joined to the anchor ridge by a shoulder 6 and to the foot by a groove or recess 19. The radial compression of the foot during the initial insertion of the male pipe end serves to firmly anchor the packing via the ridge 8 and groove 5 with the recess 19 accommodating the compressively deformed material, whereafter the continued insertion of the male end radially compresses and axially extends the body portion to ensure a tight seal. This configuration reduces the insertion force and enables greater dimensional variations to be tolerated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.