US4066189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlled injection of a molten material under pressure
Assignee: Ube Corp
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Filing: 1976-01-28
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Granted: 1978-01-03
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Expires: 1996-01-28
Abstract
Abstract A method of injecting a molten material such as molten metal or plasticizing resin under pressure and an apparatus performing the same wherein the piston speed of a cylinder for injecting the molten material is made to decrease before the mold cavity is filled up to the full with the molten material, thereby peak pressure generated in the molten material filled up to the full being eliminated and further pressure vibration occurred in a pressurized oil being obviated.
Inventors
- 👤 Ueno Toyoaki
- 👤 Takayama Seizo
- 👤 Hashimoto Kiyoshi
- 👤 Uchida Masashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:04
CPC Classifications
B; B22; B22D; B22D17/00; B22D17/20; B22D17/32; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/76; B29C45/77; B29C45/82
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
330 words
A variable speed, liquid driven injection cylinder having first and second chambers with an inlet port coupled to said first chamber and an outlet port coupled to said second chamber, said inlet and outlet ports adapted to selectively permit the flow of a liquid into and out of said chambers, said injection cylinder further having (i) a piston head and an associated piston rod slidably disposed therein such that said piston rod extends out of said cylinder adjacent said second chamber, said piston head having an opening at one end thereof in axial alignment with a cavity located in said piston rod, said piston rod having a port adjacent said piston head; and (ii) a hollow tube coupled to said cylinder and disposed through said opening in said piston head and into said cavity and said piston rod, said hollow tube having a check valve at one end thereof and at least one port adjacent the other end, said piston head configured to selectively block said ports on said hollow tube as said piston rod slides out of said cylinder, whereby after said first and second chambers are filled with liquid, as further liquid is caused to enter said first chamber through said inlet port, liquid in said second chamber is initially prevented from exiting out of said outlet port and is caused to flow along a path through said port on said piston rod, each of said ports on said hollow tube, selectively through said check valve and into said first chamber, as the amount of liquid in said first chamber increases, said piston rod is caused to move out of said cylinder and whereby as the piston rod is caused to move out of said cylinder, each of said ports on said hollow tube are selectively blocked off by said piston head such that said liquid in said second chamber is prevented from traveling to said first chamber and is caused to flow out of said outlet port.
Claim 2
Dependent Claim
330 words
A variable speed, liquid driven injection cylinder having first and second chambers with an inlet port coupled to said first chamber and an outlet port coupled to said second chamber, said inlet and outlet ports adapted to selectively permit the flow of a liquid into and out of said chambers, said injection cylinder further having (i) a piston head and an associated piston rod slidably disposed therein such that said piston rod extends out of said cylinder adjacent said second chamber, said piston head having an opening at one end thereof in axial alignment with a cavity located in said piston rod, said piston rod having a port adjacent said piston head; and (ii) a hollow tube coupled to said cylinder and disposed through said opening in said piston head and into said cavity and said piston rod, said hollow tube having a check valve at one end thereof and at least one port adjacent the other end, said piston head configured to selectively block said ports on said hollow tube as said piston rod slides out of said cylinder, whereby after said first and second chambers are filled with liquid, as further liquid is caused to enter said first chamber through said inlet port, liquid in said second chamber is initially prevented from exiting out of said outlet port and is caused to flow along a path through said port on said piston rod, each of said ports on said hollow tube, selectively through said check valve and into said first chamber, as the amount of liquid in said first chamber increases, said piston rod is caused to move out of said cylinder and whereby as the piston rod is caused to move out of said cylinder, each of said ports on said hollow tube are selectively blocked off by said piston head such that said liquid in said second chamber is prevented from traveling to said first chamber and is caused to flow out of said outlet port.
Claim 3
Dependent Claim
36 words
An injection cylinder according to claim 1 wherein said piston head has a regulating means disposed therein for selectively blocking each said port of said hollow tube as said piston rod slides out of said cylinder.
Claim 4
Dependent Claim
44 words
An injection cylinder according to claim 2 wherein a liquid input means is coupled to said check valve for supplying said liquid to said cylinder such that upon activation of said liquid input means, said piston rod is caused to slide in said cylinder.
Claim 5
Dependent Claim
28 words
An injection cylinder according to claim 1 wherein a first throttling means is coupled to said cylinder for regulating the flow of said liquid into said first chamber.
Claim 6
Dependent Claim
162 words
An injection apparatus for use in an injection molding system comprising an injection cylinder having an inlet port and an outlet port adapted to selectively permit the flow of a liquid into and out of said cylinder, said injection cylinder further having first and second ends with a piston slidably disposed therein and extending out of said first end thereof, and a hollow tube coupled to said piston and extending out of said second end of said injection cylinder, said hollow tube having at least one port and said piston having blocking means for blocking off each said port on said hollow tube as said piston slides in said cylinder whereby as liquid is caused to flow into said injection cylinder through said inlet port, said piston is caused to slide in said cylinder said liquid being initially permitted to flow through each said port on said hollow tube and is then prevented therefrom as each said port engages said blocking means.
Claim 7
Dependent Claim
162 words
An injection apparatus for use in an injection molding system comprising an injection cylinder having an inlet port and an outlet port adapted to selectively permit the flow of a liquid into and out of said cylinder, said injection cylinder further having first and second ends with a piston slidably disposed therein and extending out of said first end thereof, and a hollow tube coupled to said piston and extending out of said second end of said injection cylinder, said hollow tube having at least one port and said piston having blocking means for blocking off each said port on said hollow tube as said piston slides in said cylinder whereby as liquid is caused to flow into said injection cylinder through said inlet port, said piston is caused to slide in said cylinder said liquid being initially permitted to flow through each said port on said hollow tube and is then prevented therefrom as each said port engages said blocking means.
Claim 8
Dependent Claim
42 words
An injection apparatus according to claim 5 wherein a control cylinder is located within said injection cylinder with said hollow tube extending therein, said control cylinder for controlling the rate at which said piston slides in and out of said injection cylinder.
Claim 9
Dependent Claim
48 words
An injection apparatus according to claim 6 wherein a cavity is defined in said injection cylinder, in which cavity said piston is disposed, and further wherein a passageway is defined in said injection apparatus joining said control cylinder and said cavity with a valve disposed along said passageway.
Claim 10
Dependent Claim
63 words
An injection apparatus according to claim 5 wherein said casing has a second passage coupling said casing with said injection cylinder adjacent said second end of said injection cylinder such that as said piston slides in said cavity towards said first end of said injection cylinder, said liquid travels through said casing and back into said injection cylinder adjacent said second end thereof.
Claim 11
Dependent Claim
34 words
An injection apparatus according to claim 5 wherein said rod member in said casing has means for selectively preventing said liquid from flowing through said casing when said rod is extended a predetermined distance.
Claim 12
Dependent Claim
170 words
An injection apparatus for use in an injection molding system comprising an injection cylinder having a first end with an outlet port and a second end with an inlet port, said inlet and outlet ports adapted to selectively permit the flow of a liquid into and out of said injection cylinder, said injection cylinder further having a piston slidably disposed in a cavity formed in said injection cylinder and extending outwardly from said first end thereof, a casing coupled to said injection cylinder and having a slidable rod member disposed in a cavity formed in said casing and extending outwardly therefrom, said rod member and said piston being coupled together, said casing further having a passage joining said cavity in said casing with said cavity in said injection cylinder such that when a liquid is injected into said injection cylinder adjacent said second end thereof, said piston is caused to slide in said injection cylinder which, in turn, causes said rod member in said casing to slide in said casing.
Claim 13
Dependent Claim
170 words
An injection apparatus for use in an injection molding system comprising an injection cylinder having a first end with an outlet port and a second end with an inlet port, said inlet and outlet ports adapted to selectively permit the flow of a liquid into and out of said injection cylinder, said injection cylinder further having a piston slidably disposed in a cavity formed in said injection cylinder and extending outwardly from said first end thereof, a casing coupled to said injection cylinder and having a slidable rod member disposed in a cavity formed in said casing and extending outwardly therefrom, said rod member and said piston being coupled together, said casing further having a passage joining said cavity in said casing with said cavity in said injection cylinder such that when a liquid is injected into said injection cylinder adjacent said second end thereof, said piston is caused to slide in said injection cylinder which, in turn, causes said rod member in said casing to slide in said casing.
Claim 14
Dependent Claim
24 words
An injection apparatus according to claim 10 wherein a valve member is disposed in said casing to regulate the flow of said liquid therethrough.
Claim 15
Dependent Claim
191 words
An injection cylinder for injecting a molten material into a mold comprising a. an elongated, hollow injection cylinder having a first and second end with a first port adjacent the first end thereof and a second port adjacent the second end thereof, said first and second ports adapted to selectively permit the flow of a liquid into and out of said injection clyinder, b. a piston and associated piston rod slideably disposed in said injection cylinder and extending out of first end thereof, said piston and rod forming an elongated cavity opening into said injection cylinder, said piston and rod further having at least one port adjacent the end disposed within said injection cylinder; c. a hollow tube coupled to said second end of said injection cylinder and slideably extending into said cavity in said piston and piston rod, said tube having at least one port adjacent the end extending into said cavity and a valve at the opposite end of said tube; d. throttling means coupled to said injection cylinder adjacent said first and second ports for controlling the flow of said liquid into and out of said injection cylinder.
Claim 16
Dependent Claim
191 words
An injection cylinder for injecting a molten material into a mold comprising a. an elongated, hollow injection cylinder having a first and second end with a first port adjacent the first end thereof and a second port adjacent the second end thereof, said first and second ports adapted to selectively permit the flow of a liquid into and out of said injection clyinder, b. a piston and associated piston rod slideably disposed in said injection cylinder and extending out of first end thereof, said piston and rod forming an elongated cavity opening into said injection cylinder, said piston and rod further having at least one port adjacent the end disposed within said injection cylinder; c. a hollow tube coupled to said second end of said injection cylinder and slideably extending into said cavity in said piston and piston rod, said tube having at least one port adjacent the end extending into said cavity and a valve at the opposite end of said tube; d. throttling means coupled to said injection cylinder adjacent said first and second ports for controlling the flow of said liquid into and out of said injection cylinder.
Claim 17
Dependent Claim
34 words
An injection cylinder according to claim 12 wherein said piston head has a regulating means disposed therein for selectively blocking each said port on said tube as said piston slides out of said cylinder.
Claim 18
Dependent Claim
164 words
An injection apparatus for use in an injection molding system comprising an injection cylinder having first and second cavities formed therein and having an outlet port adjacent a first end and an inlet port adjacent a second end of said injection cylinder, said injection cylinder further having a piston slideably disposed in said cavity and extending out of said first end of said injection cylinder, a hollow tube formed integrally with said piston and extending toward said second end of said injection cylinder and into said second cavity, said tube having at least one port adjacent said second end of said injection cylinder, a passage joining said second cavity in said injection cylinder with said first cavity, a check valve disposed in said passageway so as to regulate the flow of said liquid in said injection cylinder, and means disposed in said injection cylinder for selectively blocking said ports on said tube as said tube slides in a predetermined direction in said injection cylinder.
Claim 19
Dependent Claim
164 words
An injection apparatus for use in an injection molding system comprising an injection cylinder having first and second cavities formed therein and having an outlet port adjacent a first end and an inlet port adjacent a second end of said injection cylinder, said injection cylinder further having a piston slideably disposed in said cavity and extending out of said first end of said injection cylinder, a hollow tube formed integrally with said piston and extending toward said second end of said injection cylinder and into said second cavity, said tube having at least one port adjacent said second end of said injection cylinder, a passage joining said second cavity in said injection cylinder with said first cavity, a check valve disposed in said passageway so as to regulate the flow of said liquid in said injection cylinder, and means disposed in said injection cylinder for selectively blocking said ports on said tube as said tube slides in a predetermined direction in said injection cylinder.
Claim 20
Dependent Claim
52 words
An injection apparatus according to claim 14 wherein said piston is disposed in a first cavity in said injection cylinder and said tube extends into a second cavity in said injection cylinder, said second cavity forming a control cylinder for controlling the rate at which said piston slides in said injection cylinder.
Claim 21
Dependent Claim
34 words
An injection cylinder according to claim 14 wherein a solenoid-operated valve is coupled to an associated pump which in turn is coupled to said check valve whereby oil is selectively regulated to check valve.
Claim 22
Dependent Claim
30 words
An injection cylinder according to claim 14 wherein an area is formed in said injection cylinder adjacent said check valve, said area communicating with the interior of said hollow tube.
Claim 23
Dependent Claim
22 words
An injection cylinder according to claim 17 wherein said inlet port in said cylinder communicates with said area adjacent said check valve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |