Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – For extrusion or injection type shaping means
Patent
1998-03-10
2000-02-22
Timm, Catherine
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
For extrusion or injection type shaping means
425533, 425535, B29C 4948, B29C 4958
Patent
active
060273259
ABSTRACT:
A mandrel assembly for use in shaping and injection molds, the assembly includes a support having compressed air channels, and a mandrel extending upwardly from the support and having spaced-apart ramps extending radially outwardly therefrom. A cap slidingly fits over the mandrel and has a free end positioned over the compressed air channels of the support. The cap also has an inner groove loosely receiving the ramps of the mandrel such that the cap is secured to the mandrel yet is able to slide up and down on the mandrel such that the free end of the cap will cover and uncover the channels. According to another embodiment of the present invention, the mandrel has an outer groove, and a plurality of balls are received in the outer groove. The cap has an inner groove corresponding to the outer groove that loosely receives the balls such that the cap is secured to the mandrel yet is able to slide up and down on the mandrel such that the free end of the cap will cover and uncover the channels.
REFERENCES:
patent: 3412186 (1968-11-01), Piotrowski
patent: 3865530 (1975-02-01), Jesselallee et al.
patent: 4086315 (1978-04-01), Piotrowski
patent: 4309380 (1982-01-01), Sauer
patent: 4668177 (1987-05-01), Gatti
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