Blow-pin having an improved seal assembly
AssigneeCrown Cork & Seal Technologies Corporation
InventorWalter K. Schoch
Life of this patent
Estimating the term…
Abstract
A blow-pin assembly includes a circular body, a ring member, and a seal assembly. The body and the ring member define a central passage. The seal assembly comprises a seal band. The body and the ring member retain the seal band proximate an outer circumferential surface of the body. A neck portion of a parison is positioned over the outer circumferential surface. Pressurized air is routed through the central passage and into the parison during blow-molding operations. The pressurized air causes the parison to expand into the sides of a surrounding mold, thus forming the parison into a hollow object such as a container. The pressurized air also urges the seal band into the parison neck portion, thereby inhibiting leakage of the pressurized air between the neck portion and the blow-pin assembly.
Claims29
A blow-pin assembly using pressurized air to blow mold hollow objects from parisons, comprising:
- a circular body having (i) an outer circumferential surface for receiving the parison neck portion, (ii) a central passage for receiving pressurized blow air, (iii) a circular groove formed in the outer circumferential surface, the groove having a contact surface, and (iv) a through hole formed between the central passage and the groove for directing the pressurized air from the central passage to the groove;
- and
- an annular seal band having first and second contact surfaces, the second contact surface having a substantially identical geometric profile to the contact surface of the groove, the seal band being retained in the groove so that the pressurized air from the cental passage urges the first contact surface of the seal band into contact with the parison and urges the second contact surface of the seal band into surface contact with the contact surface of the groove, whereby the seal band inhibits leakage of the pressurized air from both the parison and the groove.
A blow-pin assembly using pressurized air to blow mold hollow objects from parisons comprising:
- a circular body having an outer circumferential surface for receiving the parison neck portion, a bottom surface, a first circular recess adjoining the bottom surface and the outer circumferential surface, a central passage for receiving pressurized air, and a through hole formed between the central passage and the first recess for directing the pressurized air from the central passage to the first recess;
- a ring member having a top surface fixedly coupled to the body bottom surface, the top surface defining a second recess that is substantially aligned with the first recess, the first and the second recesses forming a groove;
- and
- an annular seal band retained within the groove and urged into contact with the parison neck portion by the pressurized air, whereby the seal band inhibits leakage of the pressurized air between the parison and the blow-pin assembly.
A blow-pin assembly using pressurized air to blow mold hollow objects from parisons, comprising:
- a circular body having an outer circumferential surface for receiving the parison neck portion, a bottom surface defining a circular recess, and a central axis;
- an actuator ring slidably disposed within the body recess and having an outer circumferential surface, the actuator ring translating axially in a first direction in response to pressurized air;
- and
- an annular seal band slidably disposed around the actuator ring outer circumferential surface, the translation of the actuator ring in the first direction urging the seal band into the parison, whereby the seal band inhibits leakage of the pressurized air between the parison and the blow-pin assembly.
A blow-pin assembly using pressurized air to blow mold hollow objects from parisons, comprising:
- a circular body having a bottom surface and an outer circumferential surface for receiving the parison neck portion;
- a ring member contacting the body bottom surface;
- and
- an O-ring having a substantially triangular cross-section, the O-ring being retained by the body bottom surface and the ring member proximate the body outer circumferential surface so that the O-ring is urged into contact with the parison neck portion in response to pressurized air, whereby the O-ring inhibits leakage of the pressurized air between the parison and the blow-pin assembly.
Dependencies are inferred from the claim text.