Injection molding tool

Claim 2

An injection molding tool comprising: a fluid operated cylinder having opposite ends, fluid inlet and outlet means in said cylinder, a piston in said cylinder, a piston rod having one end secured to said piston and having a free end projecting from said other end of the cylinder, an enlarged head portion on the free end of said piston rod having a face surface, an applicator barrel having an interior surface and also having opposite ends, said barrel being supported at one of its ends on said cylinder and the other end comprising an ejecting nozzle with an outlet opening, said piston rod extending into said applicator barrel and being arranged upon heating said ejecting nozzle and operation of said cylinder to force a molten portion of a solid resin cartridge in said barrel through said nozzle opening, and a heat conducting core member within said barrel adjacent said ejecting nozzle, said core member being of reduced diameter relative to said interior surface of said barrel to provide a passageway for molten material therearound, and heat conducting mounting means leading from said core member to the exterior of said barrel.

Claim 3

The injection molding tool of claim 1 wherein said heat conducting mounting means comprises radial pins secured to said core member and projecting through said barrel to the exterior of the latter.

Claim 4

An injection molding tool comprising a fluid operated cylinder having opposite ends, fluid inlet and outlet means in said cylinder, a piston in said cylinder, a piston rod having one end secured to said piston and having a free end projecting from said other end of the cylinder, an enlarged head portion on the free end of said piston rod having a face surface, one or more lateral recesses around said head portion of said piston rod to catch molten material which may escape rearwardly past the solid cartridges, and an applicator barrel having an interior surface and also having opposite ends, said barrel being supported at one of its ends on said cylinder and the other end comprising an ejecting nozzle with an outlet opening, said piston rod extending into said applicator barrel and being arranged upon heating said ejecting nozzle and operation of said cylinder to force a molten portion of a solid resin cartridge in said barrel through said nozzle opening.

Claim 5

An injection molding tool comprising a fluid operated cylinder having opposite ends, fluid inlet and outlet means in said cylinder, a piston in said cylinder, a piston rod having one end secured to said piston and having a free end projecting from said other end of the cylinder, an enlarged head portion on the free end of said piston rod having a face surface, one or more lateral recesses around said head portion of said piston rod to catch molten material which may escape rearwardly past the solid cartridges, and an applicator barrel having an interior surface and also having opposite ends, said barrel being supported at one of its ends on said cylinder and the other end comprising an ejecting nozzle with an outlet opening, said piston rod extending into said applicator barrel and being arranged upon heating said ejecting nozzle and operation of said cylinder to force a molten portion of a solid resin cartridge in said barrel through said nozzle opening.

Claim 6

An injection molding tool comprising a fluid operated cylinder having opposite ends, fluid inlet and outlet means in said cylinder, a piston in said cylinder, a piston rod having one end secured to said piston and having a free end projecting from said other end of the cylinder, an enlarged head portion on the free end of said piston rod having a face surface, an applicator barrel having an interior surface and also having opposite ends, said barrel being supported at one of its ends on said cylinder and the other end comprising an ejecting nozzle with an outlet opening, said piston rod extending into said applicator barrel and being arranged upon heating said ejecting nozzle and operation of said cylinder to force a molten portion of a solid resin cartridge in said barrel through said nozzle opening, and an indicator rod movable with said piston and having a free end projecting through said other end of said cylinder in parallel relation with said piston rod exteriorly of said barrel, the length of said indicator rod being such that the free end thereof is laterally aligned with the face surface of said head portion.

Claim 7

An injection molding tool comprising a fluid operated cylinder having opposite ends, fluid inlet and outlet means in said cylinder, a piston in said cylinder, a piston rod having one end secured to said piston and having a free end projecting from said other end of the cylinder, an enlarged head portion on the free end of said piston rod having a face surface, an applicator barrel having an interior surface and also having opposite ends, said barrel being supported at one of its ends on said cylinder and the other end comprising an ejecting nozzle with an outlet opening, said piston rod extending into said applicator barrel and being arranged upon heating said ejecting nozzle and operation of said cylinder to force a molten portion of a solid resin cartridge in said barrel through said nozzle opening, and an indicator rod movable with said piston and having a free end projecting through said other end of said cylinder in parallel relation with said piston rod exteriorly of said barrel, the length of said indicator rod being such that the free end thereof is laterally aligned with the face surface of said head portion.

Claim 8

The applicating tool of claim 4 wherein said indicator rod is releasably securable to said piston.

Claim 9

The applicating tool of claim 4 wherein said indicator rod is magnetically and releasably securable to said piston.

Claim 10

An injection molding tool comprising: a fluid operated cylinder having opposite ends, fluid inlet and outlet means in said cylinder, a piston in said cylinder, a piston rod having one end secured to said piston and having a free end projecting from said other end of the cylinder, a head portion on the free end of said piston rod having a face surface, an applicator barrel having an interior surface and also having opposite ends, said barrel being supported at one end of its ends on said cylinder and the other end of said barrel comprising an ejecting nozzle with an outlet opening, said piston rod extending into said applicator barrel and being arranged upon heating said ejecting nozzle and operation of said fluid operated cylinder to force a molten portion of a solid resin cartridge in said barrel through said nozzle opening, said nozzle opening being of reduced diameter relative to the interior surface of said barrel and communicating with said interior surface by a tapered surface, and a heat conducting core member mounted within said barrel, said core member being of reduced diameter relative to the interior of said barrel to provide a passageway for molten material therearound, said core member having oppositely directed tapered cone-shaped surfaces, one of said cone-shaped surfaces being of reduced diameter relative to said tapered surface and of said barrel and directed into said tapered surface and the other of said cone-shaped surfaces being directed into molten material in said barrel being advanced by said piston for directing the molten material in said passageway around said core member and uniformly heating it. around.

Claim 11

An injection molding tool comprising: a fluid operated cylinder having opposite ends, fluid inlet and outlet means in said cylinder, a piston in said cylinder, a piston rod having one end secured to said piston and having a free end projecting from said other end of the cylinder, a head portion on the free end of said piston rod having a face surface, an applicator barrel having an interior surface and also having opposite ends, said barrel being supported at one end of its ends on said cylinder and the other end of said barrel comprising an ejecting nozzle with an outlet opening, said piston rod extending into said applicator barrel and being arranged upon heating said ejecting nozzle and operation of said fluid operated cylinder to force a molten portion of a solid resin cartridge in said barrel through said nozzle opening, said nozzle opening being of reduced diameter relative to the interior surface of said barrel and communicating with said interior surface by a tapered surface, and a heat conducting core member mounted within said barrel, said core member being of reduced diameter relative to the interior of said barrel to provide a passageway for molten material therearound, said core member having oppositely directed tapered cone-shaped surfaces, one of said cone-shaped surfaces being of reduced diameter relative to said tapered surface and of said barrel and directed into said tapered surface and the other of said cone-shaped surfaces being directed into molten material in said barrel being advanced by said piston for directing the molten material in said passageway around said core member and uniformly heating it. around.

Claim 12

The injection molding tool of claim 7 wherein said head portion of said piston rod includes one or more lateral recesses therearound to catch molten material which may escape rearwardly past the solid cartridges.

Claim 13

The injection molding tool of claim 7 including an indicator rod movable with said piston and having a free end projecting in parallel relation with said piston rod exteriorly of said barrel, the length of said indicator rod being such that the free end thereof is laterally aligned with the face surface of said head portion.

Claim 14

The injection molding tool of claim 7 wherein said barrel has sighting means through the walls thereof such that an operator can tell by sight the position of said head portion of said piston rod in said barrel.

Claim 15

The injection molding tool of claim 7 wherein surfaces of said core member are uneven to cause agitation of molten material flowing past said core member.

Claim 16

The injection molding tool of claim 7 wherein surfaces of said core member have radially extending separating edges and intermediate ramps and inclines to cause agitation of molten material flowing past said core member.

Claim 17

The injection molding tool of claim 7 wherein said barrel is formed of at least two parts connectable together adjacent said core member, said core member being formed integrally with one of said barrel parts and having one of its tapered surfaces projecting into said other barrel part.

Claim 18

The injection molding tool of claim 7 wherein said piston is operated hydraulically, and said injection molding tool further comprising second piston and cylinder means independent of said hydraulically operated piston, the piston of said second piston and cylinder means being operated by pressured gas and having communication with said hydraulically operated piston by a flexible hose for driving said hydraulically operated piston.

Claim 19

The injection molding tool of claim 7 including a thermocouple arranged to be removably attached to said tool, and coupler means on said barrel arranged for connection to said thermocouple for sensing the temperature within the barrel, said thermocouple including a sensing head embedded in said barrel adjacent said ejecting nozzle and having circuitry for said thermocouple leading away from said nozzle and also embedded in said barrel.

Claim 20

The injection molding tool of claim 15 including electrically operated display means electrically connected to said thermocouple and displaying temperature of said ejecting nozzle.

Claim 21

An injection molding tool comprising: an hydraulically operated piston cylinder assembly having opposite ends, hydraulically inlet and outlet means in said assembly, a piston rod in said assembly having a free end projecting from said cylinder, a head portion on the free end of said piston rod having a face surface, an applicator barrel having an interior surface and also having opposite ends, said barrel being supported at one of its ends on said piston cylinder assembly and the other end of said barrel comprising an ejecting nozzle with an outlet opening, said piston rod extending into said applicator barrel and being arranged upon heating said ejecting nozzle and operation of said piston cylinder assembly to force a molten portion of a solid resin cartridge in said barrel through said nozzle opening, said nozzle opening being of reduced diameter relative to the interior surface of said barrel and communicating with said interior surface by a tapered surface, a gas pressure operated piston cylinder assembly independent of said hydraulic piston cylinder assembly, and flexible hose means establishing communication between said two piston cylinder assemblies in an arrangement wherein said gas pressure operated cylinder assembly drives said hydraulically operated piston.

Claim 22

An injection molding tool comprising: an hydraulically operated piston cylinder assembly having opposite ends, hydraulically inlet and outlet means in said assembly, a piston rod in said assembly having a free end projecting from said cylinder, a head portion on the free end of said piston rod having a face surface, an applicator barrel having an interior surface and also having opposite ends, said barrel being supported at one of its ends on said piston cylinder assembly and the other end of said barrel comprising an ejecting nozzle with an outlet opening, said piston rod extending into said applicator barrel and being arranged upon heating said ejecting nozzle and operation of said piston cylinder assembly to force a molten portion of a solid resin cartridge in said barrel through said nozzle opening, said nozzle opening being of reduced diameter relative to the interior surface of said barrel and communicating with said interior surface by a tapered surface, a gas pressure operated piston cylinder assembly independent of said hydraulic piston cylinder assembly, and flexible hose means establishing communication between said two piston cylinder assemblies in an arrangement wherein said gas pressure operated cylinder assembly drives said hydraulically operated piston.