Method of making and using molds for longitudinally curved sections of pipe insulation
US4276245A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 1979 |
| Grant date | Jun 30, 1981 |
| Priority date | — |
| Expiry date | Aug 22, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C33/38
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A first mold is made by mounting a plurality of semicircular ribs of a relatively large radius on a board in spaced relationship and centered along an arc on the board with the ribs extending generally radially of the arc and having diametral portions of their peripheries facing the board, foaming a foamable hardenable liquid resin in place between each pair of adjacent ribs, and applying hardenable liquid resin over the ribs and foam. A glass fiber reinforced outer jacket for insulation is formed on and removed from the first mold. A second mold is made similarly to the first but using semicircular ribs of a relatively small radius. The outer jacket is mounted on the second mold and the space therebetween has foamable hardenable liquid resin inserted therein to form a jacketed longitudinally curved semicircular section of foamed resin pipe insulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.