Injection device
AssigneeKabushiki Kaisha Meiki Seisakusho
InventorsTakashi Shinoda, Yoshimasa Makino
Life of this patent
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Abstract
In an injection device 10 having a plunger 11 reciprocably inserted into a heating cylinder 16, in which a molten material M is injected by the plunger 11 via a nozzle 21, a sealing portion 13 set so that the molten material M is prevented from easily entering a gap A between the plunger 11 and an inner wall 32 of the heating cylinder 16 is provided on the portion of the plunger 11, on the side of the nozzle 21, and the portion of the sealing portion 13, on the side of the nozzle 21 is a core keeping portion 14 provided so that an annular portion 20 which is formed on a front portion of the plunger 11 and is connected to a storage portion 19 of the molten material M is formed between the core keeping portion 14 and the inner wall 32 of the heating cylinder 16.
Claims7
An injection device having a plunger reciprocably inserted into a heating cylinder, in which a molten material supplied to the front of the plunger is injected by the plunger via a nozzle and is charged into a die, wherein
- a sealing portion set so that the molten material is prevented from easily entering a gap between the plunger and an inner wall of a heating cylinder, is provided on the portion of the plunger, on the side of the nozzle;
- and
- the portion of the sealing portion, on the side of the nozzle is a core keeping portion provided so that an annular portion which is formed on a front portion of the plunger and is connected to a storage portion of the molten material is formed between the core keeping portion and the inner wall of the heating cylinder.
An injection device having a plunger reciprocably inserted into a heating cylinder, in which a molten material supplied to the front of the plunger is injected by the plunger via a nozzle and is charged into a die, wherein
- the plunger is provided with a sealing portion having a cylinder portion provided so that a molten resin cannot easily enter a gap between the cylinder portion and an inner wall of the heating cylinder;
- and
- a core keeping portion having a cylinder portion formed on the portion of the sealing portion, on the side of the nozzle, said cylinder portion having a diameter smaller than that of the sealing portion and being provided so that a gap between the cylinder portion and the inner wall of the heating cylinder is larger than the gap between the sealing portion and the inner wall of the heating cylinder.
An injection device having a plunger reciprocably inserted into a heating cylinder, in which a molten material supplied from a tip of the plunger is injected by the plunger via a nozzle and is charged into a die, wherein
- a front portion of the inner wall of the heating cylinder defines a diameter-increased portion;
- and
- the plunger is provided with a sealing portion having a cylinder portion provided so that a molten resin cannot easily enter a gap between the cylinder portion and the inner wall of the heating cylinder at completion of an injection;
- and a core keeping portion having a cylinder portion formed on the portion of the sealing portion, on the side of the nozzle, said cylinder portion being provided so that an annular portion is formed between the cylinder portion and the diameter-increased portion of the inner wall of the heating cylinder at completion of an injection.
Dependencies are inferred from the claim text.