US2543417A - Safety throwout for goosenecks of die casting machines - Google Patents

Description

Feb. 27, 1951 H. MORIN 2,543,417

SAFETY THRowoUT FOR GoosENEcKs oF DIE CASTING MACHINES.

Filed July 3, 1947 Patented Feb. 27, 195i SAFETY 'EHROWUT FR GSENECKS F Dill] CASTING MACHINES Louis H. Morin, Bronx, N. Y.

Application `luly 3, 1947, Serial No. 758,868

(Ci. lil- 30) lll Claims.

This invention relates to die casting macl'iines employing conventional gooseneck swingably mounted in the pot of the machine in movement of the nozzle of the gooseneck toward and from the dies. More particularly, the invention deals with automatically air actuated means for supporting the gooseneck, or goosenecl; operating member, in position, maintaining the nozzle in spaced relation to the dies in the event of the failure of either die of the. machine from cornpleting its full closing stroke lmovement. ,Still more particularly, the invention includes means for shutting-off supply of air under pressure to the gooseneck as and when the dies have not completed a closing movement, thereby preventing discharge of casting material into im properly closed dies.

The novel features of the invention will be best understood from the following description,

when taken together with the accompanying drawing, in which certain embodiments of the invention are disclosed and, in which, the separate parts are designated by suitable reference characters in each of the views and, in which:

Fig. 1 is a partial sectional view through the die guides and operating mechanism of a casting machine, showing part of the safety con trol mechanism of the machine; and

Fig. 2 is a diagrammatic side and sectional view showing the gooseneok mechanism and the control and operating mechanism therefor and also indicating the circuit controlling operation of the machine.

My present invention relates to die casting machines of the hydraulically operated type as more clearly illustrated in a companion application, entitled Hydraulic Die Casting Machine, Serial No. 753,190, iiled June '7, 1947.

In Fig. l, I have shown at lil part of a frame of a machine, in which is arranged two similar' die guides Il and l2. In the guides ll and i2 are slidably mounted die supporting members I3 and lll supporting on their adjacent surfaces dies l5 and it which are detachable with respect to the members i3 and lll, as by way of plates Il and lil, having screws it and 20.

At the outer end portions of the members i3 and lll are heads 2l and 22. Supported on these heads are brackets Evi-2li, in which are adjustably supported control screws and 25. The screws 25 and 2e operate in conjunction with pistons or plungers 27 and 28 of two control cylinders 29, 29', both of which are of the same construction. Therefore, the brief description of one will apply to the other. Opening 2 into the sides of the cylinders 29, 29', as at 3, are air admissions from an air supply pipe 3l and, at 32, 32', are shown air discharges, at one end of the cylinders communicating with a common pipe 33, which opens into a pipe 34, one end of which leads to an air cylinder 35, note Fig. 2, and the other end extends to one side of a diaphragm 36. Considering the cylinder it will appear that a spring S'l is employed to normally extend the piston or plunger 223 and, in like manner, the plunger 2l, against the control screws 26, 25, respectively, or in the outermost position in the cylinders. AS the die is moved to closed position, the control screws 25, 2d operate to move the pistons inwardly so that their inner ends, as at 3,5 at the right .of Fig. l, seal ports 3.9, so as to block air under pressure in the pipe .3l from entering either ci the admissions 3l?, 3D.- I.f either die does l not fully close. then air will be admitted to pass through the respective cylinder and out through the pipe E32, 32 to actuate the cylinder 35 and the diaphragm 35, as later described.

Detachaloly mounted in yoke ends fill, Alli of 3 the frame, are hydraulic cylinders l, tl', in

which are mounted pistons d2, 42. The pistons are adapted to operate upon blocks 4.3, .43' secured in the head end 2l, 22 of the members lf3 and lli in movement of the dies into closed position. lThis operation is performed lby injec tion of oil under pressure through pipes 44, 4 4 into the cylinders lil, All. shown, is employed to move the dies into open position.

In Fig. l of the drawing, I have shown at IE5 a transfer finger or pin constituting part of a transfer mechanism d6, the finger or pin being normally supported between the dies l5 and l5 so that the casting, as at lll, is for-med thereon, note Fig. 2. Suitable means is vprovided to actuate the mechanism 46 to move the casting tl to trimming and stripper stations, as more clearly disclosed in the application heretofore referred to.

The supports Il and l2 include a rear plate, as at d8, note Fig. 2, which has an aperture 49 therein for the reception of the nozzle 59 of the gooseneck 5l of the machine, so that the nozzle can be brought into abutting engagement with 'the closed dies for pressure injection of casting material into the die cavity in forming the casting di. T -he gooseneck 5I is pivoted in the frame, as seen at e2, and on the gooseneclq is an adjustable screw ,53 which operates upon a roller 5.4i supported at the free end of an arm keyed Other means, not.

to a rocker shaft 56 arranged adjacent the pivot 52.

On the shaft 56 is a long lever i', having diverging arms 5o and 59. The arm 59 is disposed over the plunger pin B of a piston or plunger Si in the cylinder The arm 58 carries a roller 62 operating upon a cam 63 on the main shaft 64 of the machine. The roller G2 is held, at all times, in engagement with the cam S3 by a spring 85, the spring being arranged upon a hook rod E6, the hook end of which engages a fixed pin or rod 68 in the frame of the machine. The spring 85 seats on an arm on the gooseneck and the tension of the spring is adjustably controlled by nuts T8 on the rod 66. The spring SE also serves to control engagement of the nozzle 513 under pressure with the dies during injection of casting material into the die cavity.

It will be understood that the cam B3 allows the gooseneck to be moved downwardly to bring the nozzle 58 into pressure engagement with the dies and also serves to raise the gooseneck in intermittent movement of the nozzle out of engagement with the dies as a casting is moved to the trimming and stripper stations in the cycle of operation of the machine.

Supported in the frame of the machine is a shaft Il, note Fig. 2, geared to the shaft 84 through gears which are indicated by dot dash lines at l2, 73 and 14. On the shaft 'H is a cam 15 adapted to operate the plunger or piston 'i6 of a control valve T. The valve 'il' controls transmission of oil under pressure to the pipes 44, 44 and thus to the hydraulic cylinders 4l, 4

in operating the plungers or pistons 42, 42. In Fig. 2, I have diagrammatically illustrated at 'I8 the hydraulic pump which pumps oil from a suitable tank, not shown, into the valve 'l1 through port I9, from which it is discharged through port 80, communicating with both pipes 44, 44'. At 8| is shown a return or overflow for return back to the oil tank. A spring 82 normally supports the plunger I5 in engagement with the cam '15.

In Fig. 2 I have also diagrammatically shown the circuit wires 83, 84 to the electric motor, diagrammatically indicated at 85 in the drawing. In the circuit wires is a switch 86 actuated by the plunger pin 8l' of the diaphragm 36. In the circuit of the wires 83, 84 is an electrically actuated valve 88 which controls the supply of air to the gooseneck through the air admission pipe indicated at 89. This air serves to pressure discharge casting material from the gooseneck into the die cavity.

From the foregoing, it will be apparent that, in normal operation of the machine, the air cylinder 35 and diaphragm 35 are inoperative insofar as interfering with operation of the machine is concerned. In the event that either one of the dies l5, iS fails to complete its full closing stroke motion, then air is permitted to pass into one of the pipes 32, 32 to actuate both the piston 6! in the cylinder and th-e pin 8? of the diaphragm 3S. The latter will trip the switch 86, stopping the electric motor 85 and also checking the valve 88 to prevent admission of air to the gooseneck 5|. `Admission of air into the cylinder 35 will cause the pin G8 to be raised, to swing the gooseneck into its inoperative position with the nozzle 58 spaced with respect to the dies and to retain the gooseneck in this position until such time as necessary repair to the die actuating mechanism or die is made.

In machines of the kind under consideration, there are times when foreign matter presents itself between abutting surfaces of the dies, preventing th-e dies from fully completing their closing stroke motion and, to avoid injection of the casting material into open dies, the safety control and gooseneck throw-out mechanism is provided. It will be apparent that a relatively simple and, yet, mechanically fool-prooi control is maintained in operation of machines of the kind under consideration.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

l. In die casting machines employing a gooseneck for discharge of casting material under pressure into the cavity o1 a pair of dies through the nozzle of the gooseneck, the combination including a pair of dies movable toward and from each other, a gooseneck movable into and out of engagement with said dies, automatically actuated means for maintaining the nozzle of said gooseneck in spaced relation to the dies in the event that either die fails to complete its full closing stroke movement, a cam actuated lever controlling movement of the gooseneck nozzle toward and from the dies, and said rst named means comprising an air actuated plunger operatively engaging said lever to support the same and the gooseneck with said nozzle in spaced relation to the dies.

2. In die casting machines employing a gooseneck for discharge of casting material under pressure into the cavity of a pair of dies through the nozzle of the gooseneck, the combination including a pair of dies movable toward and from each other, a gooseneck movable into and out of engagement with said dies, automatically actuatsd means for maintaining the nozzle of said gooseneck in spaced relation to the dies in the event that either die fails to complete its full closing stroke movement, a cam actuated lever controlling movement of the gooseneck nozzle toward and from the dies, said rst named means comprising an air actuated plunger operatively engaging said lever to support the same and the gooseneck with said nozzle in spaced relation to the dies, means actuated by the dies controlling supply of air to said plunger, and said last named means actuating means controlling stoppage of operation of the machine.

3. In die casting machines employing a gooseneck for discharge of casting material under pressure into the cavity of a pair of dies through the no;zle of the gooseneck, the combination including a pair of dies movable toward and from each other, a gooseneck movable into and out of engagement with said dies, automatically actuated means for maintaining the nozzle of said gooseneck in spaced relation to the dies in the event that either die fails to complete its ull closing stroke movement, a cam actuated lever controlling movement of the gooseneck nozzle toward and from the dies, said rst nam-ed means comprising an air actuated plunger operatively engaging said lever to support the same and the gooseneck with said nozzle in spaced relation to the dies, means actuated by the dies controlling supply of air to said plunger, said last named means actuating means controlling stoppage of operation of the machine, an electrically actuated valve controlling supply of air under pressure to the gooseneck for discharge of casting material through said nozzle, and said last named means controlling actuation of said 5 valve to shut-off supply of air to the gooseneck upon stoppage of machine operation.

4. In a die casting machine the combination including a pair of dies movable toward and from each other, a gooseneck having a discharge nozzle, means swingably supporting the gooseneck to move the nozzle toward and from said dies, means comprising a cam actuated lever for swinging said gooseneck, an air actuated plunger operatively engaging said lever to support the 31= nozzle of said gooseneck in spaced relation to the dies, to be independent of cam operation of said lever, and means supported on each die controlling supply of air to said plunger, whereby the failure of either die to complete its full stroke movement will cause said plunger to be actuated to support said lever in position maintaining the nozzle in spaced relation to the dies.

5. In a die casting machine the combination including a pair of dies movable toward and from each other, a gooseneck having a discharge nozzle, means swingabiy supporting the gooseneck to move the nozzle toward and from said dies, means comprising a cam actuated lever for swinging said gooseneck, an air actuated plunger operatively engaging said lever to support the nozzle of said gooseneck in spaced relation to the dies to be independent of cam operation of said lever, means supported on each die controlling supply of air to said plunger, whereby the failure of either die to complete its full stroke movement will cause said plunger to be actuated to support said lever in position maintaining the nozzle in spaced relation to the dies, and said last named means being adjustable.

6. In a die casting machine the combination including a pair of dies movable toward and from each other, a gooseneck having a discharge nozzle, means swingably supporting the gooseneck to move the nozzle toward and from said dies, means comprising a cam actuated lever for swinging said gooseneck, an air actuated plunger operatively engaging said lever to support the nozzle of said gooseneck in spaced relation to the dies to be independent of cam operation of said lever, a valve controlling supply of air under pressure to said goosenecl: in discharge of casting material through said nozzle, and means actuated by each die controlling operation of said plunger and said valve to maintain the f nozzle in spaced relation to the dies and to shutoff supply of air to said gooseneck in the event that either die fails to complete its full closing stroke movement.

7. In a die casting machine the combination including a pair of dies movable toward and from each other, a gooseneck having a discharge nozzle, means swingably supporting the gooseneck to move the nozzle toward and from said dies, means comprising a cam actuated lever for swinging said gooseneck, an air actuated plunger operatively engaging said lever to support the nozzle of said gooseneck in spaced relation to the dies to be independent of cam operation of said lever, a valve controlling supply of air under pressure to said gooseneck in discharge of casting material through said nozzle, means actuated by each die controlling operation of said plunger and said valve to maintain the nozzle in spaced relation to the dies and to shut-off supply of air to said gooseneck in the event that either die fails to complete its full closing stroke movement, and other means actuated by the last named means for stopping operation of the machine.

8. In die casting machines employing a gooseneck, a nozzle on the gooseneck through which casting material is injected into the cavity of a pair of dies movable toward and from each other, means pivotally supporting the gooseneck, means for actuating the gooseneck to swing the same on its pivot in movement of the nozzle toward and from the die, means automatically actuated upon the failure of the machine to perform at least one of its functions for blocking swinging movement of said gooseneok and maintaining the nozzle thereof in spaced relation to the dies.

9. In die casting machines employing a gooseneck, a nozzle on the gooseneck through which casting material is injected into the cavity of a pair of dies movable toward and from each other, means pivotally supporting the gooseneck, means for actuating the gooseneck to swing the same on its pivot in movement of the nozzle toward and from the die, means automatically actuated upon the failure of the machine to perform at least one of its functions for blocking swinging movement of said gcoseneck and maintaining the nozzle thereof in spaced relation to the dies, means for ejecting casting material from the gooseneck through said nozzle, and said automatically actuated means controlling said last named means to prevent discharge of material from the nozzle when the nozzle is maintained in spaced relation to the dies.

10. In a die casting machine havingl a nozzle that is moved into engagement with a pair of movable dies for discharging casting material under pressure into the cavity formed by said dies when said dies are in closed position, an air-operated safety throwoutincluding lever means for maintaining the nozzle in spaced relation to the dies, air-operated means for actuating said last-mentioned means and control means for controlling the supply of air to said actuating means, said control means being actuated by said dies to release air to said actuating means upon failure of either of the dies to complete its closing movement.

1l. In a die casting machine having a nozzle that is moved into engagement with a pair of movable dies for discharging casting material under pressure into the cavity formed by said dies when said dies are in closed position, an air-operated safety throwout including lever means for maintaining the nozzle in spaced relation to the dies, air-operated means for actuating said last-mentioned means, air-operated means for stopping the machine, and means for controlling the supp-ly of air to both of said airoperated means, said control means being actuated by said dies to release air to said air-operated actuating means and machine stopping means upon failure of either of the dies to complete its closing movement.

12. In a die casting machine having a nozzle that is moved into engagement with a pair of movable dies for discharging casting material under pressure into the cavity formed by said dies when said dies are in closed position, an airoperated safety throwout including lever means for maintaining the nozzle in spaced relation to the dies, air-operated means for actuating said last-mentioned means, air-operated means for stopping the machine, air-operated means for discharging casting material through the nozzle to the dies, and control means for controlling the supply of air to each of said air-operated means, said control means being actuated by said dies to release air to each of said air-oper- 7 ated means upon failure of either die to complete its closing movement.

13. In die casting machines employing a gooseneck for discharge of casting material under pressure into the cavity of a pair of dies through the nozzle of the gooseneck, a cam actuated lever for moving the gooseneck to bring the nozzle thereof into and out of engagement With the dies, an air actuated plunger pin cooperating with said lever for maintaining the nozzle of the gooseneck in spaced relation to the dies in the event that eithei` die fails to complete its full closing stroke movement, control valves actuated by the dies controlling supply of air to said plunger pin, and said last named valves controlling supply of air to a device stopping operation of the machine.

14. In die casting machines employing a gooseneck for discharge of casting material under pressure into the cavity of a pair of dies through the nozzle of the gooseneck, a cam actuated lever for moving the goosenecl: to bring the nozzle thereof into and out of engagement with the dies, an air actuated plunger pin cooperating with said lever for maintaining the nozzle of the gooseneck in spaced relation to the dies in the event that either die fails to complete its full closing stroke movement, control valves actuated by the dies controlling supply of air to said plunger pin, said last named valves controlling supply of air to a device stopping operation o the machine, an electrically actuated valve controlling supply of air under pressure to the gooseneck for discharge of casting material through said nozzle, and said device controlling the oircuit to said electrically actuated valve to shut-oir supply of air to the gooseneck upon stoppage of the machine operation.

LOUIS H. MORIN.

REFERENCES CITED UNITED STATES PATENTS Name Date Jobst Apr. 3, 1945 Number

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