Injection device
AssigneeFanuc Corporation
InventorsKyousuke Nakamura, Akira Oomori
Life of this patent
Estimating the term…
Abstract
An injection device comprises: a plunger provided inside a barrel and a nozzle; a seal provided rearward of an injection inlet for the nozzle to prevent a molding material from flowing rearward; and a seal case that holds the seal. The seal case is fixed by the barrel and the nozzle, and has a first inner radial surface that forms a first inner radial hollow section for the plunger to penetrate, and a second inner radial surface that forms a second inner radial hollow section into which the seal is fitted. At least a portion of the first inner radial surface has a female thread section formed thereon.
Claims12
An injection device that performs molding by injecting molding material into a mold from a nozzle member provided at a distal end of a barrel, the injection device comprising:
- a plunger disposed in an internal bore of the barrel and an internal bore of the nozzle member, and movable in a front-rear direction along an axial direction;
- a feed throat provided in the nozzle member in order for the molding material to be fed into the internal bore of the nozzle member;
- a seal having an annular shape, provided rearward of the feed throat, and configured to prevent the molding material fed from the feed throat from flowing rearward along the plunger;
- and
- a seal housing configured to be accommodated in a rear end portion of the nozzle member rearward of the feed throat and hold the seal between the seal housing and the plunger, the seal housing having a tubular shape and an outer diameter larger than a diameter of each of the internal bores,
- wherein the seal housing is fixed by a front end portion of the barrel and the rear end portion of the nozzle member attached to the barrel, both the front end portion of the barrel and the rear end portion of the nozzle member facing to the seal housing in the axial direction, and includes:
- a first inner surface forming a first internal bore through which the plunger passes;
- and a second inner surface forming a second internal bore in which the seal is held, the second internal bore having a larger diameter than the first internal bore and being coaxial with the first internal bore, and
- an internally threaded portion having a larger diameter than the plunger is formed in at least a part of the first inner surface, wherein the internally threaded portion is configured to couple and de-couple with a screw bolt.
Dependencies are inferred from the claim text.