JOSEPH E ZIMMERMAN
Paramedic at 57 Ln, Miami, FL

4981430, Jan 1, 1991

Jan 23, 1989

7/299890

Joseph E. Zimmerman - Miami FL

B29C 4542

425444

A pneumatically operated mold ejection apparatus using a pneumatic pressure source exterior to a multiplate injection molding tool. The pressure source operates at least one knock-out pin disposed within a molding plate. Said pin is connected to a pneumatic piston spring loaded against a stop positioning the pin flush with the inner wall of the cavity during injection of plastic. The stop also positions the piston so that compressed air can reach the piston's surface when the pressure source is actuated. The piston includes a circumferential annular groove containing an O-ring for pneumatic sealing. The back side of the molding plate includes pneumatic channels between the cylinder and their intersection with a complimentary channel in the backing plate. These channels connect the system to the pressure source, and are surrounded by an O-ring trapped between the molding and backing plates for pneumatic sealing.

5259105, Nov 9, 1993

Feb 20, 1990

7/481297

Joseph E. Zimmerman - Miami FL

B23P 1100

29436

Provided is a method of use of a pneumatically operated mold ejection apparatus using a pneumatic pressure source of conventional means exterior to a multiplate injection molding tool. The pressure source is selectively activated using the mold cycle to operate at least one knock-out pin disposed within the molding plate, usually the cavity plate. The knock-out pin is connected to a pneumatic piston which is urged by biasing means to a stop such that the knockout pin is positioned flush with the inner wall of the molding surface or cavity during injection of plastic or other molding material into the tool. The side of the molding plate opposite the molding surface is characterized by at least one pneumatic channel between the piston and its intersection with a complimentary pneumatic channel in a backing plate. The latter is perforated by a pneumatic orifice for connection of the system to the external pneumatic pressure source. The pneumatic channel of the molding plate and complimentary pneumatic channel of the backing plate are surrounded by a perimeter groove in which is disposed an O-ring to optimize sealing against leakage of the compressed air from between the molding plate and adjacent backing plate.

D278999, May 28, 1985

Mar 14, 1983

6/475092

Joseph Zimmerman - Miami FL

D13 40

D311125, Oct 9, 1990

Jul 6, 1987

7/069938

Joseph Zimmerman - Miami FL

D 8352