Plastic article or earthenware shaping or treating: apparatus – Mold opening and closing means and segmented female mold – Varying pressure and/or speed closing
Patent
1988-02-26
1989-08-29
Housel, James
Plastic article or earthenware shaping or treating: apparatus
Mold opening and closing means and segmented female mold
Varying pressure and/or speed closing
91440, 91519, 92111, 100269B, 100273, 425150, 425419, 4254519, 425590, 425595, B29C 4567, F15B 1102
Patent
active
048612596
ABSTRACT:
A mold clamping device is disclosed. The device includes a clamping ram, whose front end is connected to a moveable board of an injection molding machine, slidably fitted in a clamping cylinder, and a support cylinder provided in parallel to the clamping cylinder. A support piston is slidably positioned in the support cylinder, and the front end of the rod of the support piston is connected to the moveable board of the injection molding machine. A front chamber and a rear chamber of the clamping cylinder, divided by the piston section of the clamping ram, and a front chamber of the support cylinder are connected by an oil path. There is provided a valve for opening or closing the connection between the rear chamber of the clamping cylinder and the front chamber of the clamping cylinder and the front chamber of the support cylinder. The effective pressure receiving area of the rear chamber of the clamping cylinder is substantially equal to the sum of the effective pressure receiving area of the front chamber of the clamping cylinder and the front chamber of the support cylinder.
REFERENCES:
patent: 3786725 (1974-01-01), Aoki
patent: 3818801 (1974-06-01), Kime
patent: 3935791 (1976-02-01), Hehl
patent: 4079617 (1978-03-01), Whiting
patent: 4158327 (1979-06-01), Aoki
patent: 4380427 (1983-04-01), Hehl
patent: 4409884 (1983-10-01), Boehringer
patent: 4565116 (1986-01-01), Hehl
Stewart et al., ABC's of Hydraulic Circuits, Howard W. Sams & Co., Inc., Indianapolis, IN (1973), pp. 109-117.
Housel James
Nissei Jushi Kogyo Kabushiki Kaisha
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