US3701377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for die casting by pressure injection
Assignee: Fisher Gauge Ltd
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Filing: 1970-09-29
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Granted: 1972-10-31
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Expires: 1990-09-29
Abstract
Abstract A method and apparatus for pressure die casting in which the frame carrying the gated die is counterbalanced over the injection nozzle for movement between a lowered seated position and a raised unseated position, and floated initially to seat the gate on the nozzle. Certain of the interfitting die parts are moved and releasably locked by applying, by pivotal leverage through the die frame, a force acting in the direction of closing movement of the die, preferably by wedge means acting parallel to that direction. The sprue in the die is sheared by moving the gated die part laterally, and a subsequent lateral movement of the gated die part may introduce pressurized fluid into the die cavity to blow the sprue from the gate.
Inventors
- 👤 William Frederick Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:00
CPC Classifications
B; B22; B22D; B22D17/00
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
125 words
A method of pressure die casting employing an injection apparatus having a nozzle and a die frame carrying a gated die seatable on the nozzle, comprising the steps of: supporting the die frame above the nozzle on movable means and counterbalancing the supporting means between a lowered position and a raised position; floating the die frame on the movable supporting means by fluid pressure to precisely align and seat the gate of the die on the nozzle when the supporting means is in the lowered position, and anchoring the die frame on the supporting means when the gate is seated on the nozzle; and lowering and raising the movable supporting means to seat and unseat the die on the nozzle in a cyclical casting operation.
Claim 2
Independent Claim
125 words
A method of pressure die casting employing an injection apparatus having a nozzle and a die frame carrying a gated die seatable on the nozzle, comprising the steps of: supporting the die frame above the nozzle on movable means and counterbalancing the supporting means between a lowered position and a raised position; floating the die frame on the movable supporting means by fluid pressure to precisely align and seat the gate of the die on the nozzle when the supporting means is in the lowered position, and anchoring the die frame on the supporting means when the gate is seated on the nozzle; and lowering and raising the movable supporting means to seat and unseat the die on the nozzle in a cyclical casting operation.
Claim 3
Dependent Claim
28 words
A method as claimed in claim 1 in which the supporting means is counterbalanced by fluid pressure urging the supporting means about a pivot into the raised position.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 1 in which the supporting means is moved both axially and laterally with respect to the nozzle.
Claim 5
Dependent Claim
19 words
A method as claimed in claim 1 in which the supporting means is releasably locked in the lowered position.
Claim 6
Dependent Claim
129 words
Apparatus for pressure die casting using an injection nozzle and means for the controlled feeding of molten metal through the nozzle, comprising: a die frame having die parts mountable thereon including a die gate; means supporting the die frame, said supporting means being counterbalanced and movable between a lowered position and a raised position; means to float the die frame on the supporting means whereby the die gate is precisely aligned and seated on the injection nozzle when the supporting means is in the lowered position, and means to anchor the die frame on the supporting means when the gate is seated on the nozzle; and means to lower and to raise the counterbalanced supporting means whereby the die gate is cyclically seated and unseated on the injection nozzle.
Claim 7
Dependent Claim
129 words
Apparatus for pressure die casting using an injection nozzle and means for the controlled feeding of molten metal through the nozzle, comprising: a die frame having die parts mountable thereon including a die gate; means supporting the die frame, said supporting means being counterbalanced and movable between a lowered position and a raised position; means to float the die frame on the supporting means whereby the die gate is precisely aligned and seated on the injection nozzle when the supporting means is in the lowered position, and means to anchor the die frame on the supporting means when the gate is seated on the nozzle; and means to lower and to raise the counterbalanced supporting means whereby the die gate is cyclically seated and unseated on the injection nozzle.
Claim 8
Dependent Claim
42 words
Apparatus as claimed in claim 5 in which the supporting means includes a yoke pivotally mounted adjacent one end on a fixed base and supported adjacent the other end by fluid piston means adapted to urge the yoke towards the raised position.
Claim 9
Dependent Claim
29 words
Apparatus as claimed in claim 5 in which the lowering and raising means is adapted to move the die gate both axially and laterally with respect to the nozzle.
Claim 10
Dependent Claim
21 words
Apparatus as claimed in claim 5 in which the supporting means is adapted to be releasably locked in the lowered position.
Claim 11
Dependent Claim
37 words
Apparatus as claimed in claim 6 in which the raising and lowering means comprises link means pivotably interconnecting the base and the free end of the yoke, and means to pivot the link means about the base.
Claim 12
Dependent Claim
47 words
Apparatus as claimed in claim 9 in which the pivoting means comprises a rack and pinion assembly, a drive wheel keyed to the pinion, and a drive arm pivotably connecting the drive wheel and the link means, and fluid pressure means adapted to actuate the pinion reciprocally.
Claim 13
Dependent Claim
35 words
Apparatus as claimed in claim 10 in which the pinion is adapted to move the drive arm past dead center to abut stop means whereby the supporting means is releasably locked in the lowered position.
Claim 14
Dependent Claim
118 words
In a pressure die casting operation employing a plurality of die parts mounted on a die frame and interfitting to form a die cavity, a method of releasably closing and locking at least one of said die parts comprising the steps of: moving said one die part, in a direction opposite to the reactive force on the die when closed and charGed, to close the die; applying, by pivotal leverage through the die frame when the die is closed, a force acting on said one die part in the direction of closure of the die, said force acting through the die frame and sufficient to withstand the reactive force on the die part when the die is charged.
Claim 15
Dependent Claim
118 words
In a pressure die casting operation employing a plurality of die parts mounted on a die frame and interfitting to form a die cavity, a method of releasably closing and locking at least one of said die parts comprising the steps of: moving said one die part, in a direction opposite to the reactive force on the die when closed and charGed, to close the die; applying, by pivotal leverage through the die frame when the die is closed, a force acting on said one die part in the direction of closure of the die, said force acting through the die frame and sufficient to withstand the reactive force on the die part when the die is charged.
Claim 16
Dependent Claim
30 words
A method as claimed in claim 12 in which a said force is effected by wedge action applied through the die frame in a direction parallel to said reactive force.
Claim 17
Dependent Claim
118 words
In pressure die casting apparatus, a device for moving and locking a die part to close a die mounted on a die frame, comprising: means mounting the die part on the die frame; means to move the die part mount, in a direction opposite to the reactive force on the die part when closed and charged, to close the die; at least one latch member pivotably mounted on the die frame and engagable with the die part mount when the die is closed; and means mounted on the die frame and actuable, when the die is closed, to engage the latch member whereby the latch member bears against the die part mount in the direction of closure thereof.
Claim 18
Dependent Claim
118 words
In pressure die casting apparatus, a device for moving and locking a die part to close a die mounted on a die frame, comprising: means mounting the die part on the die frame; means to move the die part mount, in a direction opposite to the reactive force on the die part when closed and charged, to close the die; at least one latch member pivotably mounted on the die frame and engagable with the die part mount when the die is closed; and means mounted on the die frame and actuable, when the die is closed, to engage the latch member whereby the latch member bears against the die part mount in the direction of closure thereof.
Claim 19
Dependent Claim
28 words
A device as claimed in claim 14 in which the means to engage the latch member comprises wedge means actuated by hydraulic means fixed on the die frame.
Claim 20
Dependent Claim
31 words
A device as claimed in claim 15 in which the wedge means is adapted to move against the latch member in a direction parallel and opposite to said direction of closure.
Claim 21
Independent Claim
165 words
A method of pressure die casting employing a plurality of die parts interfitting to form a die cavity, one of said die parts carrying a die gate adapted to seat on an injection nozzle, comprising the steps of: seating the die gate on the nozzle and injecting molten casting material through the nozzle into the die cavity; allowing the molten material to solidify and moving the die to unseat the die gate from the injection nozzle; moving laterally that die part carrying the die gate to shear the sprue, formed by solidification of the molten material in the die gate, from the casting in the die cavity; separating the die parts to remove the casting from the die cavity, reclosing the die parts to re-form the die cavity, and moving laterally that die part carrying the die gate to expose an aperture therein and introduce fluid under pressure into the die cavity whereby the sheared sprue if retained in the die gate is ejected therefrom.
Claim 22
Independent Claim
165 words
A method of pressure die casting employing a plurality of die parts interfitting to form a die cavity, one of said die parts carrying a die gate adapted to seat on an injection nozzle, comprising the steps of: seating the die gate on the nozzle and injecting molten casting material through the nozzle into the die cavity; allowing the molten material to solidify and moving the die to unseat the die gate from the injection nozzle; moving laterally that die part carrying the die gate to shear the sprue, formed by solidification of the molten material in the die gate, from the casting in the die cavity; separating the die parts to remove the casting from the die cavity, reclosing the die parts to re-form the die cavity, and moving laterally that die part carrying the die gate to expose an aperture therein and introduce fluid under pressure into the die cavity whereby the sheared sprue if retained in the die gate is ejected therefrom.
Claim 23
Dependent Claim
16 words
A method as claimed in claim 17 in which the pressurized fluid is a lubricating mist.
Claim 24
Dependent Claim
129 words
A die for use in pressure casting, comprising: a plurality of die parts interfitting to form a die cavity; one of said die parts having a flat inner surface and being adapted to slide laterally along said surface, and said one die part carrying a gate therein for injection of molten casting material into the die cavity, an aperture in said one die part opening into said cavity, said aperture being adapted to register with a duct connecting said die with a source of pressurized fluid whereby, when said one die part is slid laterally a predetermined distance along said surface and when said die cavity is empty, said fluid is released under pressure into said cavity whereby a sheared sprue if retained in the gate is ejected therefrom.
Claim 25
Dependent Claim
129 words
A die for use in pressure casting, comprising: a plurality of die parts interfitting to form a die cavity; one of said die parts having a flat inner surface and being adapted to slide laterally along said surface, and said one die part carrying a gate therein for injection of molten casting material into the die cavity, an aperture in said one die part opening into said cavity, said aperture being adapted to register with a duct connecting said die with a source of pressurized fluid whereby, when said one die part is slid laterally a predetermined distance along said surface and when said die cavity is empty, said fluid is released under pressure into said cavity whereby a sheared sprue if retained in the gate is ejected therefrom.
Claim 26
Dependent Claim
16 words
A die as claimed in claim 19 in which the pressurized fluid is a lubricating mist.
Claim 27
Dependent Claim
54 words
Apparatus as claimed in claim 5 in which the means to float the die frame comprises at least one cavity located in the supporting means, the die frame including a surface portion covering the cavity, and fluid pressure means connecting with the cavity whereby the die frame is movable laterally on the supporting means.
Claim 28
Dependent Claim
100 words
A device as claimed in claim 14 including a guide key fixed to the die frame in the direction of closure of the die part mount and having the latch member coextensive therewith, first slotted means fixed on the die part mount and engagable with the guide key to prevent lateral rotation of the mount, second slotted means rotatable on tHe die part mount, the second slotted means being engagable with the guide key except when the mount is closed and laterally rotatable when the mount is closed to provide a bearing surface for the latch member against the mount.
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |