Sealing device for indirect extrusion die

Claim 2

In combination: a. a container providing an internal chamber adapted for receipt of a billet of material to be extruded; b. means for sealing one end of said container; c. a hollow elongated ram disposed coaxially with said container chamber adjacent its open end; d. a die providing orifice means, 1. said die being positioned on one end of said ram so that upon relative movement of said container and die under extrusion forces and in extrusion direction, said billet material is extruded through said orifice means and passed through said ram; and e. a sealing element removably positioned in cooperating relationship with said die for movement with said die during the extrusion of said billet material, 1. said sealing element having an outer surface positioned in sliding sealing engagement with the inner wall surface container during an extrusion stroke and locating said die within and spaced from said inner wall surface, and 2.

Claim 3

said sealing element including a radially inwardly directed lip overlying the forward face of the die to cover the line of juncture between the adjacent surfaces of said die and sealing element to prevent

Claim 4

said sealing element including a radially inwardly directed lip overlying the forward face of the die to cover the line of juncture between the adjacent surfaces of said die and sealing element to prevent

Claim 5

said billet material from extruding therebetween. 2. The combination of claim 1 wherein: a. said sealing element is wholly supported by said die.

Claim 6

The combination of claim 1 wherein: a. said sealing element is supported on said die against relative axial movement during an extrusion stroke.

Claim 7

The combination of claim 1 wherein: a. the forward face of said die underlies said sealing element in supporting relation to the lip of the sealing element.

Claim 8

The combination of claim 1 wherein: a. said die includes a shoulder rearwardly of its forward face extending laterally of the direction of axial extrusion forces for supporting said sealing element.

Claim 9

The combination of claim 5 wherein: a. said adjacent surfaces are mating surfaces and extend from the forward face to the shoulder in a direction substantially coaxial to the direction of axial extrusion forces.

Claim 10

The combination of claim 5 wherein: a. the adjacent surfaces which extend from the forward face to the shoulder are mating beveled surfaces complementary to one another.

Claim 11

The combination of claim 1 wherein: a. the adjacent surfaces extend from the forward face to the rearward face first in a spaced conical relation and then in a mating coaxial relation relative to the direction of axial extrusion forces.

Claim 12

The combination of claim 1 wherein: a. the outer dimension of the die is less than the outer dimension of the ram; and b. the sealing element has: 1. an inner surface complementary to the outer surface of the die terminating in an intermediate base surface aligned with the forward exposed surface of the ram, and 2. a rearward section disposed about the forward end of the ram in mating relation therewith.

Claim 13

A sealing element adapted to be positioned in association with a die, and at least partially in front and partially around said die to define a line of juncture, prior to extrusion of material from a billet of extrudable material confined within a supporting container, said sealing element having: a. an outer dimension in excess of the outer dimension of said die, said outer dimension being substantially equal to the inner dimension of said container during an extrusion stroke to cooperate with the inner wall of said container during said extrusion stroke in sliding, sealing engagement; b. a laterally inwardly directed lip overlying the line of juncture of said die and sealing element to prevent said billet material from extruding therebetween; and c. said sealing element being adapted to be releasably positioned in front of and around said die for removal upon completion of an extrusion stroke to permit unrestrained relative axial movement of said die through said container.

Claim 14

A sealing element adapted to be positioned in association with a die, and at least partially in front and partially around said die to define a line of juncture, prior to extrusion of material from a billet of extrudable material confined within a supporting container, said sealing element having: a. an outer dimension in excess of the outer dimension of said die, said outer dimension being substantially equal to the inner dimension of said container during an extrusion stroke to cooperate with the inner wall of said container during said extrusion stroke in sliding, sealing engagement; b. a laterally inwardly directed lip overlying the line of juncture of said die and sealing element to prevent said billet material from extruding therebetween; and c. said sealing element being adapted to be releasably positioned in front of and around said die for removal upon completion of an extrusion stroke to permit unrestrained relative axial movement of said die through said container.

Claim 15

The sealing element of claim 10 further having: a. a seating surface for positioning said element directly on a complementary shaped surface on the die.

Claim 16

The sealing element of claim 11 wherein: a. the shape thereof is annular with a tapered inner wall behind said lip extending to said seating surface.

Claim 17

The sealing element of claim 11 wherein: a. the shape thereof is annular with a cylindrical inner wall behind said lip extending to said seating surface.

Claim 18

The sealing element of claim 10 wherein: a. the shape thereof is annular with an inner wall which is tapered immediately behind said lip and then cylindrical to the rearward face of the die.

Claim 19

The sealing element of claim 10 wherein: a. the sealing element extends rearwardly beyond the die with an inner surface adapted to mate in surrounding relation with ram structure on which the die is to be mounted.

Claim 20

The sealing element of claim 15 further including: a. a rearwardly facing base surface at the rearward face of the die adapted to sit on the forward end of ram structure on which the die is to be mounted.

Claim 21

The sealing element of claim 10 wherein: a. the shape thereof is annular with an outer wall which is part cylindrical and part tapered.