Stretch rod extending device and bottom mold lifting device...

Details Stretch rod extending device and bottom mold lifting device... Stretch rod extending device and bottom mold lifting device...

2008-01-01

2008-01-01

Davis, Robert B. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With direct application of magnetic force to manipulate...

C425S529000

Reexamination Certificate

active

10537972

ABSTRACT:
Improvement of simplicity and durability of a stretch rod extending device and a bottom mold lifting device, equipped on a stretch blow molding machine, is achieved by applying a combination of a magnetic screw shaft and a magnetic nut member, which is able to convert rotary-linear movement smoothly without contact. The nut member and the screw shaft of the extending device6and lifting device30comprise a magnetic nut member65, 116and a magnetic screw shaft66, 117, having spiral N magnetic pole and S magnetic pole alternately provided on inner peripheral surface of a cylindrical member and outer peripheral surface of a shaft at a same regular pitch. The magnetic screw shaft is inserted into the plunger61, 115, having the magnetic nut member equipped inside with keeping required clearance so as to match the magnetic pole to oppose the magnetic nut member at the same poles each other.

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