US2578105A - Die-casting apparatus - Google Patents

Description

Dec. 11, 1951 TAYLOR 2,578,105

DIE CASTING APPARATUS Filed 11111028, 1947 2 SHEETSP-SHEET l IN VEN TOR. N JAM as Y. TAYLOR Dec. 11, 1951 I J TAYLOR 2,578,105

I DIE CASTING APPARATUS Filed June 28, 1947 2 SHEETS-SI-IEET 2 2 9 v 50 ,IIIIIIIQ%; I I I INVENTOR. JAMES v. TAYLOR.

A OP/VEK Patented Dec. 11, 1951 UNITED", STATES PATENT OFFICE Application June 28, 1947;Serial No. 757,710

2 Claims. (Cl. 25 103) This invention-relates to die casting apparatus and has particular reference to new and improved die casting apparatus for'forming toys or other objects from moist clay or the like.

An object of the invention is to provide die casting apparatus for forming objects such as toys from moist clay or the'like.

Another object of the invention is to provide apparatus-of the type set forth which is relatively-simple-and economical in construction yet eflicient in operation. i

Another object of the invention is to provide an extrusion die for apparatusof thetype set forth.

Another object of the invention is to provide a device of the character described wherein the dies may be easily and quickly interchanged.

Another object of the invention is to provide new and improved means for securing the'die in position while allowing complete filling of the die and preventing escape of material therefrom.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawing and that changes may be made in the details of construction and arrangement of parts. I, therefore, do not wish to be limited tothe exact details of construction and arrangement of parts shown and described as the preferred form has been given by way of illustration only.

Referring to the drawings:

Fig. 1 is a side view, partly in section, of a die casting device embodying the invention;

Fig. 2 is a fragmentary view, generally similar to Fig. 1 but showing the extrusion apparatus; Fig. 3 is a sectional view taken along line 3--3 of Fig. 2, looking in the direction of the arrows;

Fig. 4 is a sectional view taken along line 4-4 of Fig. 2, looking in the direction of th arrows; i

Fig. 5 is a sectional view taken along line 5-5 of Fig. 1, looking in the direction of the arrows; and

Fig. 6 is a sectional view generally similar to Fig. 5 but showing the extrusion apparatus of Fig. 2.

Referring more particularly to the'drawings wherein similar reference characters designate corresponding parts throughout the several views, the device shown embodying the invention comprises essentially the base i on which is supported the frame consisting of a pair of uprights 2 and 3 and the cross piece 4. For convenience in manufacturing, these members can be formed integral, as shown, from cast iron or other suit- 2 able material, although they could be formed sep arately and secured together.

Adjacent the upper end of the upright 2, there is pivotallymounted the handle member 5 to which is pivotally connected the piston or plunger .6 as hereinafter described. The cross piece or frame 4 is provided with a cylindrical section 'I having a guideway or slot 8 in the side thereof and extending from top to bottom thereof. The cylinder 4 is adapted to have the pressure cylinder 9, which is of a diameter slightly smaller than cylinder '1 and adapted to-be positioned therein by registering the stop or locking memberv I 0 with the guideway or slot Band inserting pressure cylinder 9 through cylinder 1 and then turning pressure cylinder 9 to position the stop- 10 out of alignment with slot 8. The cylinder 9 is provided with a shoulder II which retains pressure cylinder 9 within cylinder 1, that is, when the die halves are not in operative position, the shoulder ll rests on the upper edge of cylinder 1 and supports pressure cylinder 9 within cylinder 1.

l The piston or plunger 6 has its lower end 6a of slightly smaller diameter than the diameter of pressure cylinder 9 and adapted to be raised or lifted out of said cylinder when the handle 5 is raised to permit the insertion of the die casting material l2 within pressure cylinder 9 and to force the said die casting material through the opening I 3 of reduced cross section in the lower side of pressure cylinder 9 when the handle 5 is forced downwards and allowing the forcing of such material through the nozzle l9.

The die consists of die halves l4 and I5 which are supported on the basel and die half M has an opening 16 in its upper surface with a conical surrounding edge I! adapted to receive a comating edge l8 on the lower edge of the reduced extension or nozzle IS on pressure cylinder 9. By slightly raising pressure cylinder 9, the die halves l4 and I5 may be placed in operative position or removed as desired.

The extrusion die shown in Figs. 2, 3 and 6 comprises .the same apparatus as previously described except that the die halves l4 and I 5 have been replaced by the extrusion die 20 comprising the four tubular members 2 I, 22,23 andv 24 each secured at its lower end on a base 25 and each of which has conical upper ends adapted to register with the conical seat It on the extension 19 as previously described. Each of extrusion die members 2|, 22, 23 and 24' has an opening 26, 21, 28 and 29 in the side thereof and when the die is placed under the pressure cylinder 9 and the reduced extension or nozzle I9 allowed to fit into the opening adjacent to the shape hole desired and pressure applied, a continuous strip of the die cast material will be extruded in the shape selected. While two sizes of round openings, an opening in the shape of a square and an opening shaped like a section of a picture frame have been shown for illustration, dies having openings of other desired shape may be employed if desired.

The knob or stop on the pressure cylinder prevents the cylinder from lifting too high when the handle 5 is raised and will only allow pressure cylinder 9 to lift high enough for easy removing and positioning of the dies. By aligning the stop I with slot 8, it can be instantly removed for cleaning out any excess casting material that might adhere.

In operation, handle is raised, as shown in dotted lines in Fig. 1, to withdraw pistons 6 and 6a entirely from pressure cylinder 9 so that a charge of die casting material such as moist clay or other suitable material can be inserted therein. Cylinder 9 is raised slightly and die halves I4 and I5 placed under it and piston end 6a is started into pressure cylinder 9. Pressure on the handle 5 forces clay under pressure into die halves I4 and I5 thereby to fill all the crevices in said die halves.

After the cavities of the die are filled, raising handle 5 slightly will, because of friction between piston 5a and pressure cylinder 9, lift cylinder 9 so that die halves I4 and [5 may be easily removed after which they may be pulled apart and die casted object removed and allowed to dry after which they may be painted.

It will be noted that the same pressure which extrudes the clay through nozzle I9 will press the loosely mounted cylinder 9 down against the opening I6 in the die half I4 with the co-mating conical edges l1 and I8 in engagement so that clay does not escape and at the same time this pressure holds the die halves I4 and I5 together with considerable locking force until their cavities are full. The die half I5 is supported on base I and die half I 4 is supported on die half I5 and is engaged by nozzle I9 whereby pressure on the handle 5 forces the piston 6a against the molding material I2 and, therefore, pressure on the handle 5 is transmitted to the nozzle l9 which pressure retains the mold halves I4 and I5 firmly in engagement during the molding operation.

When the extrusion die is used, the material will be extruded in the desired shape, for example, if a round opening is used, long cylindrical sections of clay will be forced out and these may be cut into various lengths for various uses such as building toy log cabins and other objects. If the square or flat hole is used, a fiat section will be formed which can be out, if desired, into small clay bricks, or if the hole shaped like the cross section of a picture frame is used, there will be produced suitable frames for clay placques and the like and while soft it can be made to conform to any shape placque.

Before molding the toys or other objects in the die halves I4 and I5, the molding surfaces of the dies have a suitable coating applied thereto to facilitate removal of the molded article without sticking or breaking. The coating material should be some material of a slightly oily base or else some substance which will not readily combine with the surface of the clay to prevent sticking. An example of such a coating material is carbon tetrachloride with a trace of oil added, for example, eight drops of oil per ounce of carbon tetrachloride. When this coating i used, the tetrachloride evaporates leaving a thin film of oily compound on the dies to prevent sticking. Other similar materials may be employed such as naphtha, but this substance is flammable which is not the case with tetrachloride.

From the foregoing it will be seen that I have provided simple, efficient and economical means for accomplishing all of the objects and advantages of the invention.

Having described my invention, I claim:

1. In a device of the character described, a support, a frame on said support, said frame comprising an upstanding arm and an intermediate angularly disposed arm parallel to said support, a pressure cylinder supported for sliding movement on said intermediate arm, a piston for said cylinder, an operating handle for said piston pivotally connected to said upstanding arm and to said piston, a nozzle carried by the lower end of said cylinder, said nozzle engaging a die having an opening for the admission of molding material, whereby pressure on said handle first causes a sliding movement of the cylinder in its supporting arm forcing the nozzle and cylinder into contact with said die and by a successive continuous operation forces the molding material into said die. I

2. In a device of the character described, a support, a frame on said support, said frame comprising an upstanding arm and an intermediate angularly disposed arm parallel to said support, a pressure cylinder supported for sliding movement on said intermediate arm, a piston for said cylinder, an operating handle for said piston pivotally connected to said upstanding arm and to said piston, a nozzle carried by the lower end of said cylinder, said nozzle engaging a die having an opening for the admission of molding material, whereby pressure on said handle in one direction first causes a sliding movement of the cylinder in its supporting arm forcing the nozzle and cylinder into contact with said die and by a successive continuous operation forces the molding material into said die, a reverse operation of said handle raising said nozzle and cylinder permitting removal of said die, and means carried by said cylinder for limiting its movements in both directions and maintaining the same in operative position in its supporting arm.

JAMES Y. TAYLOR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 22,899 Tucker July 15, 1947 945,474 Parnham Jan. 4, 1910 1,810,126 Buchholz June 16, 1931 2,120,553 Flader June 14, 1938 2,309,729 Gordon Feb. 2, 1943 2,353,457 Goessling July 11, 1944

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