Moulded resin article
US4881890A · kind A · utility
Inventor
Key dates
| Filing date | Jun 29, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Jun 29, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C39/24
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A moulding apparatus for moulding a reaction composition including a metering cylinder having an open head-end, a piston in said cylinder, screw operable for advancement towards and retraction from said head-end, a cylinder head on said head-end, an intake port and a discharge port both opening to said head-end and both extending through said head, a circularly sectioned valve chamber extending through said head and intersecting both said ports, a plug valve rotatably housed in said chamber and having two angularly phased-apart passages through it respectively able to register with said ports, and means for actuation of said piston and rotation of said plug-valve under such co-ordinated or independent control that when said piston is retracting from said head-end the intake port is open and the discharge port is closed, and when said piston is advancing towards said head-end the intake port is closed and the discharge port is open.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.