US734597A - Pump for type-casting machines. - Google Patents

Description

No. 734,597. PATENTED JULY 28, 1903.

F. E. PEAOOGK.

PUMP FOR TYPE CASTING MACHINES.

-APPLIOATION IILBD D30. 31, 1902.

N0 MODEL. 3 SHEETB-BHEET 2.

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Q; W 3 #w in W No. 734,597. PATENTED JULY-28, 1903.

F. E. PEAGOGK'. PUMP FOR TYPE CASTING MACHINES.

APPLIOATION FILED DEC. 31, 1902.

NO MODEL. 3 SHEETS-SHEET 3,

48 I 49 1 n'n fln A I J]-A 4] 63 7 Fig.6.

. UNITED STATES Patented July 28, 1903.

PATENT ()FFICE.

FREDERICK EDE PEACOCK, on WEYBRIDGE, ENGLAND. V

.PUMP FOR TYPE-CASTING MACHINES.

SPECIFICATION forming part of Letters Patent No. 734,597, dated July 28, 1903.

Application filed December 31, 1902. Serial No. 137,303. (No model.)

To-aZZ whom it may concern:

Be it known that I, FREDERICK EDEN PEA COOK, of Weybridge, in the countyof Surrey, England, have inventedcertain new and useful Improvements in Pumps for Type-Cast: ing Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and use the same. I

The present invention relates toimprovements in the pumps of type-casting machines; and the objects of it are, first, to prevent the presence of the delivery-valve or of its seat constricting the delivery-port, and, second, to provide for the said valve being moved quite out of the path of the'metal bythat motion of it that opens the deliveryport. These two objects are secured by the following means: The pump-cylinders are arranged in pairs, so as to eject metal alternately. A separate delivery-port starts from each cylinder at the junction of the latter with the prolongation next described and runs in the direction of the delivery-nozzle, that is cornmon to allthe ports. Itis controlled by a delivery-valve of the piston-type working in an axial prolongation of the respective cylin ders, so that thevalve has no seatingto constrict the delivery-port. Each delivery-valve Works in harmony with its fellow valve by being loosely connected to the respective end of a centrally-fulcrumed lever situated outside the respective pair of cylinders. The power necessary to. eject the metal from the cylinder is applied thereto by either a piston or by airpressure, whichever ,is preferred.v

At the moment when the power is brought to bear upon the metal in a cylinder the respec tive delivery-Valve is holding the deliveryport closed, so that the said valve is forced downward into the prolongation past the delivery-port, and therefore out of the path of the metal, thereby opening the said port to its full sectional area. At the same time the power is taken off the metal in the opposite cylinder and its deliveryvalve raised to close the respective delivery-port. There may be as many pairs of, cylinders, pistons or airpressures, and delivery-valves in each complete pump as may be desired. The common delivery-port to the nozzle is provided with a stant.

as shown in Figs. 3 and 5.

loaded piston having a relief-port to keep the delivery ofthe metal through the nozzle con- This relief-port is in the side of the pistonand extends from the inner end of it outward far enough to open to the air at the proper moment.

Referring to the accompanying figures, Figure 1 is a side elevation, partly in section, on the line 1 1 of Fig. 3 of a four-pair cylinder-pump having cylinder-pistons worked'by two shafts driven by one driving-pulley; Fig. 2, an inverted plan of the port end of the relief-valve; Fig. 3, a sectional front elevation .on the line 3 3 of Fig. 1; Fig; 4, a horizontalsection on-the line 4 4 of Figs. l and3; Fig. 5, afront elevation, partlyin section, on the line 5 5 of Fig. 1; Fig. 6, a transverse'sectional elevation on the line 66 of Fig. 7 of'a one-pair cylinder-pump worked by air-pressure; Fig. '7, a plan corresponding with Fig. 6, and Fig. 8 an enlarged sectional plan on -the line 8 8 of Fig. 6.

' Referring to Figs. 1 to 5, the power necessary'to eject the metal from a cylinder is shown as applied through ordinary pistons. 1 is the metal-pot, and 2 the cylinder-block, having, among other parts described farther on, the piston-cylinders 3 and'the metal-supply-ports 4, formed therein. These ports are alternately closed and opened by the recipro- I cations of the respective. pistons described The cylinder-block 2 is supportfurther on. ed at the proper height in the metal-pot 1 to keep the ports 4 below the surface of the metal in the said pot. This is effected by bolting it to the sides of the pot 1 or to the bottom of the plate-5, which support the pair of standards 6 6, that carry the bearings 7 7 of the piston'shafts 8 9, and which plate 5 is screwed down upon lugs or ledges 10 10, projecting inwardly from the sides of the potl, 11 12 are two spur-pinions fast, respectively, on the shafts 8 9, and 13 is a drivingrpulley on the prolongation of the shaft 9, whereby both the said shafts are driven at the same speed. -14 14:

are the eccentrics, and 15 15 the pitmen by which the shafts actuate the pump-pistons 16. 17 17 are piston-guides carried, by the two standards 6 6. 18 l8arethe-deliveryports from the respective piston-cylinders 3 to 19, the delivery-port common to them all,

and which latter terminates inthe usual nozzle 20. 21 is the cylinder of the relief-valve in communication with the port 19; 22, its piston, pivoted by its top to 23, its lever, and 24the weight, adjustable lengthwise thereon. All the above-mentioned parts are well known in connection with type casting machines and may be of any suitable construction.

It has been already explained that there may be as many pairs of pistons and deliveryvalves in each complete pump as may be desired. The one illustrated comprises four pairs, two pairs to each shaft 8 9, the eccentries on the shaft 8 being preferably set at one hundred and eighty degrees with the respectively adjacent eccentrics on the shaft 9, as indicated in Fig. 3. Looking at Fig. 1, the first and second pistons from the right hand are necessarily at one hundred and eighty degrees with each other and the same with the third and fourth. The third is at ninety degrees with the second, and the fourth is level with the third-t. e., at one hundred and eighty degrees with it horizontallythe first and fourth piston descending and the second and third ascending, as indicated by the arrows.

Itisa matter of indifierence in a pump comprising more than one pair of pistons or airpressures and delivery-valves whether two, one behind the other, are paired together, as shown in Fig. l, or Whether two by the side of each other are so paired together, as shown in Fig. 6. The delivery-valve mechanism of any pair of pistons and delivery-valves is a replica of that of any other pair, so that a description of one of the pairs Willsuffice. The two pistons 16 to the right of Fig. 1 are set at one hundred and eighty degrees with each other. 25 and 26 are the respective deliveryvalves. They are of the piston type, are not connected to the respective pistons 16, and work in their respective cylinders 27 and 28, a valve-cylinder being axially alined with the respective pump-cylinder 3, its valve being immediately beneath the respective piston. Each valve has the same stroke, that being equal to the vertical depth of the respective port 18. 29 is a closed chamber in the cylinder-block 2 to make room for the downward strokes of the piston-valves 25 and 26, the equal-armed lever 32, which connects them, having its outer ends pivoted to them, as shown in Fig. 1, and the shaft 33, which serves as a fulcrum for the latter and which is carried by the block 3, as shown in Fig. 2. The function of the lever 32 is to transfer the motion of one valve to the other Without changing the rate of it, in order that when one valve is at the top of its stroke the other one shall be at the bottom. The chamber 29 is closed at the bottom by a closing-plate 34, which serves also as a stop for the downward stroke of one valvesay 25and therefore for the upstroke of the other one of the same pair. Fig. 1 shows the left-hand piston 16 of the pair under description at the bottom of its stroke, its working face being then flush with the bottom of the delivery-port 18 and the right-hand piston 16 of the same pair at the top of its stroke and the respective metalsupply port 4 open. Its cylinder 3 is therefore full of metal. At the same moment the valve 25 holds the said ports 18 open, the right-hand piston '16 and valve 26 being in the opposite positions for the reasons already given. The power of the right-hand piston 16 as it makes its downstroke (indicated by the arrow in Fig. 1) is brought to bear upon the face of the valve 26 by the interposed and inclosed metal in the respective cylinder 3, and the said valve is forced down its cylinder 28 upon the stop 34, thereby being moved out of the path of the piston, which path terminates on a level with the bottom of the respective port 18. This motion of the valve 26 also opens the said port. Both pistons being worked from the same shaft and the valve 25 by the valve 26, acting through the lever 32, as the right-hand piston 16 and valve 26 descend the left-hand piston 16 and valve 25 are raised, the said piston 16 filling its cylinder with metal through its metal-supply port 4 and the valve 25 closing the respective port 18, after which the continued rotation of the shaft 8 makes the said piston 16 and valve 25 act in the same way as just described with reference to the right-hand piston and its valve 26, while it has held for the proper time the latter in the respective positions described with reference to the lefthand piston 16 and i s valve 25.

Referring to Figs. 6 to 8, the power necessary to eject the metal from a cylinder is shown as applied by air under pressure. 1 is the metal-pot, as in the preceding figures. 40 and 41 are the cylinders, supported by a bridge-piece 42, bolted down upon flanges 43 43, projecting inwardly from the sides of the metal-pot. The air is fed constantly through a pipe 44, which delivers into a cook 45 and from which two branches 4647 communicate with the cylinders 40 and 41, respectively, preferably through their closed tops 48 49, as shown in Fig. 6, or at any rate above the level of the metal-supply ports 50 51. 52 is a port in the cock-plug 53 adapted to establish communication between the main pipe 44 and the two branches 46 and 47 (and consequently the cylinders 40 and 41) alternately,

and 54 is a port in the said plug adapted to I establish an alternate communication between the said two branches and the two cylinders on the one hand and the open air on the other. The ports 52 and 54 are so arranged with reference to each other that when the port 52 is admitting air-pressure into one cylinder 40 or 41 from the main supply 44 the port 54 is allowing the air-pressure in the other cylinder to exhaust into the open air. The cock-plug 53 is rotated with an intermittent motion, but in the same direction, by means of a suitably mounted and driven gear 55, mutilated through half its ciroumference, and therefore alternately engaging with anddisengaging from a gear 56, fast -ver 70.

' as that shown in Figs. 1 to 5.

on the said plug. This gear 56 is continuously driven in the same direction by mechanism. (Not shown.) 57 58 are reciprocating valves having ports 59 60 to control the above-mentioned metal-supply ports 50 51. Each valve works in a casing 61, fast on the respective cylinder and open on one side to the metal in the metal-pot 1. Both are connected by valve-rods 62 to the respective end of a lever 70, centrally fulcrumed upon a rod 63, supported by lumps 64, (only one shown,) fast to the pot 1, this lever corresponding functionally with any one of the levers 32 of Figs. 1 to 5. 64 65 are the two deliveryvalves corresponding functionally with the valves 25 and 26 of Figs. 1 to 5, and 66 67 their cylinders, likewise corresponding with the cylinders 27 and 28 of the said valves25 and 26. Each valve 64 65 has a tail 68, connected by a pin-and-slot device 69 to the le- 71 is the common delivery-port from the cylinders under the control of the valves 64 65 and communicates with the port.19, terminating in the nozzle 20. The reliefvalve is of the same construction throughout The piston 22 of this valve is shown in detail in Figs. 1 and 2. 72 is a tapering port extending upward from the bottom face of it, where it is largest,

to a line where it merges in the surface of the Valve, so that the higher the pressure in the pump raises it against the adjusted weight 24 onv the relief-valve lever the more considerable will be its relieving effect.

The action of the improvement illustrated in Figs. 6 to 8 is as follows: Air under pressure is flowing into the cylinder 41, previously charged with metal through the ports 60 and 51, and acting through the metal between the level of the port 51 and the delivery-valve 65 drives the latter down, thereby rocking the lever 70, closing the port 51, opening the port 71 to the cylinder 41, and making the valve 64 close the port 71 next the cylinder 40, whereby metal from the cylinder4l is ejected through the port 19 and nozzle 20. This ejection continues during the time that the gear 55 is disengaged from the gear 56 on the cockplug 53, which is therefore at rest, allowing the unused air-pressure in the cylinder 40 to exhaust through the port 54 for the purpose of allowing the said cylinder to be charged with metal through the ports 59 and 50, the

formerhaving been put in register with the latter by the above-mentioned rock of thelever 70. 1

. I claim- 1. In the pump of a type-casting machine, the combination of a pair of pump-cylinders;

a pair of valve-cylinders being axial prolonga-.

tions thereof; a pair of piston-valves working in the latter; a rocking lever to which both the said valves are connected; deliveryports from the pump-cylinders to the nozzle alternately opened and shut by the deliveryvalves; metal-supply ports to the cylinders and means for exerting an expelling pressure upon the metal in the'pump-cylinders alternately the same means sufiicing to open the respective delivery-ports by moving the delivery-valve'clear out of the path of the metal to be expelled from the respective pump-cylinder, shut off the other pump-cylinder from the delivery-port and provide for the last-mentioned cylinder being charged.

2. In the pump of a type-casting machine, the combination of a pair of pump-cylinders; a pair of valve-cylinders being axial prolongations thereof; a pair of piston-valves working in the latter; a rocking lever to which.

both the said valves are connected; deliveryports from the pump-cylinders to the nozzle alternately opened and shut by the deliveryvalves; metal-supply ports to the cylinders; means for exerting an expelling pressure upon the metal in the pump-cylinders alternately, the same means sufficing to open the respective delivery-port by moving the delivery-valve clear out of the path of the metal to be expelled from the respective pump-cylinder, shut off the other pump-cylinder from the delivery-port and provide for .the lastmentioned cylinder being charged; main-delivery-port to nozzle; and piston relief-valve; cylinder for it to work in communicating with the said port; a port in the side of the said valve extending upward from the bottom face of it where it is largest to a line where it merges in the surface of the valve; and yielding means for pressing the said valve toward the delivery-port above mentioned.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

FREDERICK EDEN PEACOOK.

Witnesses:

CHAS. S. WOODROFFE, WARWICK H. WILLIAMS.

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