Mold die
US4126292A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1977 |
| Grant date | Nov 21, 1978 |
| Priority date | — |
| Expiry date | Jun 28, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/2704
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A mold die including two or more cavities shaped to profile the configuration of mold products, a pot serving as a lead-in portion for resin of a tablet-form, or a sprue serving as a lead-in portion for molten resin, a runner leading to the pot or sprue, and gates branching from the runner and leading to respective cavities, the aforesaid gates having given convergent slopes at their exits to the cavities. The cross-sectional area of the runner is progressively decreased in the direction away from the pot or sprue, and the convergent slopes of the gates are progressively increased in the direction away from the pot or sprue, in a manner that the sum of a pressure drop in a runner portion and a pressure drop in a gate portion may be made equal for each of the cavities, thereby minimizing a difference in timing of resin to arrive respective cavities, and rendering the velocity of resin flowing into respective cavities equal to one another.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.