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US 5,368,468 AGranted
Air knockout for plastic molds
OwnerBorislav Boskovicinventor
Life of this patent
Estimating the term…
Abstract
An air-operated knockout device for plastic molds for assisting ejection of molded plastic parts from a mold. The knockout device has a body in which is installed a knockout pin. The knockout pin is normally retained within the body, but can be axially shifted to an extended position to physically eject a molded part from a mold. The knockout pin also includes an air bypass to assist the knockout pin in the ejection of the molded part.
Claims17
A knockout device for a plastic mold, comprising
- a. a cylindrical body shaped to be located in an aperture in a mold part,
- b. a cylindrical central cavity in said body, said cavity having a cylindrical outlet at one end of said body, said outlet being smaller in diameter than said central cavity,
- c. a knockout pin, said knockout pin having a cylindrical head portion located in said cavity and a cylindrical stem portion extending from said head portion into said outlet, said head portion being larger in diameter than said stem portion,
- d. means resiliently retaining said knockout pin in a seated position in said cavity with said stem retracted into said outlet,
- e. means for shifting said knockout pin to an extended position with said stem portion projecting from said outlet, and
- f. air bypass means for producing an airflow from said body proximate said outlet when said knockout is in said extended position,
- g. said outlet extending axially from said cavity, said head portion comprising a piston located within said central cavity, and said air bypass means comprising at least one longitudinal groove in said stem portion and at least one longitudinal groove in said head portion.
4 more elements
A knockout device for a plastic mold, comprising
- a. a cylindrical body shaped to be located in an aperture in a mold part,
- b. a cylindrical central cavity in said body, said cavity having a cylindrical outlet at one end of said body, said outlet having a diameter smaller than the diameter of said cavity,
- c. a knockout pin, said knockout pin having a cylindrical head portion located in said cavity and a cylindrical stem portion extending from said head portion into said outlet, said head portion and said stem portion conforming to said cavity and said outlet, respectively, with said head portion being larger in diameter than said stem portion,
- d. means resiliently retaining said knockout pin in a seated position in said cavity with said stem retracted into said outlet,
- e. means for shifting said knockout pin to an extended position with said stem portion projecting from said outlet, and
- f. air bypass means for producing an airflow from said body proximate said outlet when said knockout is in said extended position,
- g. said outlet extending axially from said cavity and said head portion comprising a piston, said air bypass means comprising at least one longitudinal groove in said stem portion and at least one longitudinal groove in said head portion.
4 more elements
Dependencies are inferred from the claim text.