Apparatus for welding thermoplastics by high pressure injection
First Claim
1. An apparatus for advancing a rod comprised of a thermoplastic material to a heated chamber for injection therefrom under pressure, the apparatus comprising:
- (a) a housing for receiving the rod having a first end for communication with the heated chamber, a second end and a bore extending therethrough from the first end to the second end;
(b) a feeding mechanism for selectively engaging the rod within the housing such that an advancement force is applied to the rod at a first location in a first direction towards the heated chamber in order to advance the rod in the first direction, wherein the advancement force is sufficient to provide an injection pressure within the heated chamber and wherein the feeding mechanism extends within the housing substantially between at least the first location and the first end of the housing and defines a bore extending therebetween for receiving the rod such that the rod is substantially supported within the bore of the feeding mechanism; and
(c) a retaining mechanism, associated with the housing, for inhibiting the movement of the rod in a second direction opposite the first direction, wherein the retaining mechanism applies a retaining force to the rod at a second location substantially about the entire circumference of the rod in response to a force applied to the rod in the second direction.
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Accused Products
Abstract
An apparatus for advancing a thermoplastic rod to a heated chamber. A housing, having a first end for communication with the chamber and a second end, receives the rod. A feeding mechanism applies an advancement force to the rod at a first location in a first direction towards the chamber. A retaining mechanism applies a retaining force to the rod at a second location in response to a force applied to the rod in a second direction opposite the first location. The rod is substantially supported within the housing from at least the first location to the first end. The retaining force is applied to the rod substantially about the entire circumference of the rod. The advancement force is applied to the rod at the first location between the first and second ends and the retaining force is applied to the rod at a second location between the first location and the second end.
20 Citations
26 Claims
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1. An apparatus for advancing a rod comprised of a thermoplastic material to a heated chamber for injection therefrom under pressure, the apparatus comprising:
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(a) a housing for receiving the rod having a first end for communication with the heated chamber, a second end and a bore extending therethrough from the first end to the second end; (b) a feeding mechanism for selectively engaging the rod within the housing such that an advancement force is applied to the rod at a first location in a first direction towards the heated chamber in order to advance the rod in the first direction, wherein the advancement force is sufficient to provide an injection pressure within the heated chamber and wherein the feeding mechanism extends within the housing substantially between at least the first location and the first end of the housing and defines a bore extending therebetween for receiving the rod such that the rod is substantially supported within the bore of the feeding mechanism; and (c) a retaining mechanism, associated with the housing, for inhibiting the movement of the rod in a second direction opposite the first direction, wherein the retaining mechanism applies a retaining force to the rod at a second location substantially about the entire circumference of the rod in response to a force applied to the rod in the second direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for advancing a rod comprised of a thermoplastic material to a heated chamber for injection therefrom under pressure, the apparatus comprising:
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(a) a housing for receiving the rod having a first end for communication with the heated chamber, a second end and a bore extending therethrough from the first end to the second end; (b) a feeding mechanism for selectively engaging the rod within the housing at a first location between the first and second ends of the housing such that an advancement force is applied to the rod at the first location in a first direction towards the heated chamber in order to advance the rod in the first direction, wherein the advancement force is sufficient to provide an injection pressure within the heated chamber and wherein the feeding mechanism extends within the housing substantially between at least the first location and the first end of the housing and defines a bore extending therebetween for closely receiving the rod such that the rod is substantially supported within the bore of the feeding mechanism; and (c) a retaining mechanism, associated with the housing, for inhibiting the movement of the rod in a second direction opposite the first direction, wherein the retaining mechanism applies a retaining force to the rod at a second location between the first location and the second end of the housing in response to a force applied to the rod in the second direction. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification