US2340525A - Pump - Google Patents

Description

Feb. l, 1944. w. GERHARD Erm.

Filed Nov. 30, `1940 5 Sheets-Sheet 1 PUMP Filed NOV. 30, 1940 W. GERRARD ETALl lf/a FAG-2.

Feb. 1, 1944.v

llllllllI Febl, 1944 w. GERRARD Erm. 2,340,525

. PUMP I Filed Nov. 50, 1940 5 Sheets-Sheet 3 Feb. l, l944.

w. GERRARD ETAL PUMP Filed Nov fao. 1940 5 sheets-sheet 4 Fb. l, 1944. w. G ERRARD yx-:TAL

PUMP

Filed Nov. 30, 1940 5 Sheets-Sheet 5 SIM M14-...Wa

Patented Feb. 1, 1944 PUMP William Gerrard, Timperley, and Walter Harris, Altrincham, England, assignors to Linotype and Machinery Limited, London, England, a limited-liability company of Great Britain Application November s0, 1940, serial No. 367,902 In Great Britain November 30, 1939 18 Claims.

This invention relates to improvements in reciprocating pumps and is particularly, but not exclusively, adapted to metal pumps such as are employed in stereotype plate casting machines. Such metal pumps are usually provided with a `spout or throat pipe communicating with a mold or other receptacle up which the molten metal which is to be cast into a stereotype plate passes under the operation of the plunger. A bypass valve is generally provided through which the molten metal is admitted to the pump cylinder.

The present invention provides a reciprocating pump adapted to discharge liquid to a mold or other receptacle having a bypass valve in the pump cylinder and mechanism for opening the said valve when the mold or receptacle is full or when a predetermined quantity of liquid has been delivered to permit the escape of excess liquid. i

The said mechanism may be actuated by the means for reciprocating the pump plunger and preferably the said plunger is reciprocated by means of a pump lever which is provided with a stop thereon the said stop being adjustable to enable the valve to be opened at the appropriate moment and adapted to engage a member which controls the opening of the bypass valve. -The pump lever may be manually operated or, in the alternative, power operated means may be provided for actuating the same. In the construction where it is designed for manual operation, a manual control is advantageously provided for closing the valve. Where, however, the lever is operated by power means, the arrange'- ment is vpreferably such that the said power means are set in motion by the same control that closes the valve. p

In vorder that the invention may be more clearly understood the same will now be described ,inv detail with reference to the accompanying drawings which illustrate the same as applied to a pump for molten metal adapted for lling molds for casting stereotype printing plates.

In these drawings- Figure 1- is a side view in section of an embodiment of the invention wherein the pump ismanually operated.

Figure 2 is an end view of Figure l in the drection of the arrow A. Y

Figure 3 is a side view in section of a further `embodiment of the invention wherein the pum is operated 'by mechanical means.

, Figure 4 is a view ofFigure 3 in the direction of` the arrow 13, with parts broken away.

Figure 5 is a plan view of the construction of Figures 3 and 4.

Referring first to Figures 1 and 2, the pump cylinder I is vertically disposed within a vmelting pot 2 which contains the molten metal 3 used for casting the plates and a spout 4 leads from the cylinder I to the mold in which the stereotype plate is cast. The pump plunger 5 is connected to' a pump plunger rod 6 Whichextends vertically through a hole l in the cylinder and is connected at a point 8 at or near its upper end to a pump lever 9 which is pivotally mounted in a bearing lIll located in the main framework of the' machine. A stop II is mounted on one side of the said pump lever 9 in a bracket I2 thereon and is adjustable lengthwise `of the said bracket by means of a screw I3 or by other suitable means. The said stop Il is adapted to engage the upper end of a valve adjusting rod I4 at a certain desired point on its downward travel Vand to yforce the same downwards in a vertical direction when the pump lever 9 is moved about its pivot I0 so as to raise the pumpplunger 5 in the cylinder I and deliver metal up the spout 4 into the casting mold.` The valve adjusting rod I4 is mounted in a suitable bracket I5. The lower end of the valve adjusting rod I4 is connected to a lever I6 which extends substantially horizontally and is mounted on a valve operating rod I'I. A second substantially horizontal connecting lever I8 is attached to the valve operating rod Il, the other ,endA of which is pivoted to the upper end of a valve rod I9. The lower end of the valve rod I9 is attached to a bypass valve 263 of inverted mushroom'type `which seats in the upper part of the pump cylinder l. In Figure 1 the valve is shown in the closed position in full lines and in the open position in dotted lines. J V

It is to be observed that upon depression of the right hand end of the pump lever 9 the pump plunger 5 is raised, causing molten metal to be pumped up the spout 4 `to `the mold. At Vthe 'same time the stop II onY the pump lever Swengages the top of the valve adjustingrod I4 at the appropriate moment and depresses theV same, causing the valve operating rod `I'lto vberotated Aand the valve rod I9 to be depressed through the operation of the connecting lever I8 above referred to. The valve Zilgis thus opened at a moment `which dependscon the adjustmentof the positionV of the stop-II on the pumplever the pump plunger 5 enables any excess of molten liquid to escape from the pump cylinder Il to the melting pot. The closing of the valve 210 is effected at the appropriate time by rotation of the valve operating rod I'l by means of a handle 2|.

The machine may, as described, be manually operated by actuation of the pump lever but power operated means may be provided for thisv purpose and the same may be advantageously employed in the case of larger machines where a substantial weight of metal requires to be raised. Such an arrangement is shown in Figures 3, 4 and 5. In these drawings the driving power is provided by an electric motor 22 mounted upon the main framework of the machine which transmits power to a shaft 23 Vat reduced movement ofV the extension 34 of the roller arm 33 and the worm wheel 26 is set in rotation by the motor 22 causing the pump plunger 5 to be set in motion. At the end of one rotation of the worm wheel 2B the roller 32 falls into the recess 3l in the disc 3i! and the switch is disconnected. The machine is thereby brought to rest and manual operation of the valve operating rod handle 2i is required to set the same into opspeed. TheV shaft 23 is conveniently mounted 1 ina bracket 24 and carries a worm 25 which is in mesh with a worm wheel 2E whi-ch in turn is mounted on a transverse shaft 2. TheY said worm wheel 25 is provided with a projecting stud 2,8 which is connected with the pump lever 9 by means of a link 29 in such a manner that rotation of the worm wheel 26 causes reciprocation of the pump lever 9 and actuates the pump plunger 5.

The worm wheel 2B is provided with a camdisc 3U which is formed at one point on its circumference with a recess 3l which is adapted to receive a roller 32 which runs upon the disc 30 and which is mounted on one end of an arm 33 which is loosely pivoted on the valve operating rodV I1. When the Worm wheel disc turns round to a position where the recess 3l is in position to receive the roller 32, the arm 33L is free -to fall so that the roller 32Vengages in the. recess 3|. extension 34 projecting beyond the valveV operating rod il the free end of which carries a rod 35 Ywhich rod is connected to a switchY tnot shown). This switch controls the electric` motor 22, the arrangement being such that when the roller 32 falls into the recess 3l the switch breaks the ci-rcuitcontrolling the motor 2r and rotation ofthe worm wheel 26 ceases. For so long, however, as the roller 32 is upon the higher part of the disc 39 Vthe circuit remains closed andthe electric motor is in operation so that the pump plunger 5 opera-tes.

The valve operating rod II is mounted in Y bearings and is provided at its free end with a handle 2l by means of which it may bema-nually rotated. A coiled tension Spring 3S is provided on this shaft one end of which is held in the shaft bearings and the other end of which engages the roller arm 3-3 so as to hold the roller 32 against the disc 30 and to ensure that the same drops into position in the recess 3i inthe said` disc 39 when it is opposite the same. A lpin or stud 31 is provided on the roller arm 33 which is adapted to engage an arm 3a which 1s nrmly nxedupon thevalve operating rod I1 so that rotationV of the rodil by the lever 2.-! tothe appropriate amount causes the roller arm V3-3to be moved through an.V arc to such an ex- Y tent that the roller 321 may be withdrawn from its recess 3l.

The operation of the` arrangement iscontrolled by manual operation of theV handle 21| of Lthe valve operating -rod Il; Rotation of this rod'closes the valve 20 and causes the roller 32 Vto bewithdrawn from the recess 31|.in the. mannerjius't described. Theswitch which sets the The said arm 33 is also provided with an Y eration again to effect another stroke of the pump plunger 5. The valve 2i) is opened at the appropriate time in the same manner as already described with reference to Figures 1 and 2.

Having described our invention, we declare that what we claim and desire to secure by Letters Patent is:

1. In a reciprocating pump adapted to discharge liquid to a receptacle, the combination of a pump cylinder, a pump plunger therein, a by-pass valve in said cylinder, automatic means for opening said valve after delivery of a predetermined quantity of liquid, a pump lever connected to said pumpv plunger, a worm wheel connected by means of a link to said pump. plunger, power operated means for driving said worm wheel, a cam disc carried by said worm wheel and having a recess therein, a cam roller held in engagement with said cam disc, and means for simultaneously raising said cam roller from said recess and for setting said power operated means in motion.

2. In a reciprocating pump. adapted to discharge liquid to a receptacle, the combination of a pump cylinder, a. p ump plunger therein, aV

by-pass valve in said cylinder, automatic. means for opening said valve after delivery of a predetermined quantity of liquid, a pump lever connected to said pump plunger, a worm wheel connected by means of a link to said pump' plunger, power operated means for driving said worm wheel, a cam disc carried by said worm wheel and having a recess therein, and a carn roller engaging said cam disc, said cam roller being mounted on an arm which is loosely mounted on a shaft, said roller being held in engagement with said cam disc by means of a torsion spring engaging saidy arm and the shaft bearing, and said shaft being connected tothe control for said power operated means.

3. In a reciprocating pump adapted to dis,- charge liquid to a, receptacle, the combination of a pump cylinder, a` pump plunger therein, a Icy-pass valve in said cylinder, automatic means for opening said valve after delivery of a. predetermined quantity of liquid, a pump lever connected to said pump plunger, a` worm wheel connected by means'of a link'toV said pump plunger, power operated means for driving said `worm wheel;v a cam disc carried' by said worm wheel and having a recess therein, a cam roller engagingsaid cam disc, saidV cam roller being mounted on an arm which is loosely mounted on a shaft, saidY roller being heldY in engagement with said cam disc yby'means of a torsion 4spring engaging said arm and the shaft bearing, said arm carrying a stud, and a second arm fast onl said shaft adapt/edl to engagesaid stud, said shaft being connected to the control for said power operated means. Y

4. In a reciprocating Vpump adapted' to discharge liquidto areceptacle, thecombination of a, pump cylinder, a pumpV plunger therein, a by-pass valve in saeidf cylinder, automatic'mean's for opening said valve-after deliver-yv of a predetermined quantity of,l liquid', a. pump leverfconnected to said pump plunger, a worm wheel connected by means of a link tosaid pump plunger,

power operated means for driving said worm wheel, a cam disc carried by said worm wheel and having a recess therein, acam roller engaging said cam disc, said cam roller being mounted on an arm which is loosely mounted on a shaft, said roller being held in engagement with said cam disc by means of a torsion spring engaging said arm and the shaft bearing, said arm carrying a stud, and a second arm fast on said shaft and adapted to engage said stud, said shaft being connected to the control for said power operated means and to said by-pass valve, the arrangement being such that rotation thereof actuates said power operated means to set said worm wheel in motion and closes said valve.

5. Inra reciprocating pump adaptedto discharge liquid to a receptacle, the combination of a pump cylinder, a pump plunger therein, a byf-pass valve in said cylinder, a pump lever connected to said pump plunger and having an adjustable stop thereon, means engaged by said stop to open said by-pass valve after delivery oa predetermined quantity of liquid, a worm wheel connected by means of a link to said pump plunger, power operated means for driving said worm wheel, a cam disc carried by said worm wheel and having a recess therein, a cam roller held in engagement with said cam disc, and means for simultaneously raising said cam roller from said recess and for setting said power operated means in motion.

6. In a reciprocating pump adapted to discharge liquid to a receptacle, the combination of a pump cylinder, a pump plunger therein, a by-pass valve in said cylinder, a valve operating rod therefor, a pump lever connected to said plunger and having an adjustable stop thereon, a valve adjusting rod connected by levers to said Valve operating rod, said stop engaging said valve adjusting rod to open said by-pass valve after delivery of a predetermined quantityk of liquid, a worm wheel connected by means of a link to said pump plunger, power -operated means for driving said worm wheel, a cam disc carried by said worm wheel and having a recess therein, a cam roller engaging said cam disc, said cam roller being mounted on an arm which is loosely mounted on a shaft, said roller being held in engagement with said cam disc by means of a torsion spring engaging said arm and the shaft bearing, said arm carrying a stud, and a second arm fast on said shaft adapted to engage said stud, said shaft being connectedto the control for `said power operated means and to said valve operating rod, the arrangement being such that rotation thereof actuates said power operated means to set said worm wheel in motion and closes said by-pass valve. i

7. In a reciprocating pump adapted to discharge liquid `from a pot to a receptacle,l the combination of a pump cylinder located in the pot, a pump plunger therein, an inletfand outlet valve located `adjacent the top of the` cylinder to insure that the cylinder at each operation of the pump plunger is lled to capacity when the pump plunger is at the lower end of its stroke notwithstanding variations in the level of the liquid in the pot and which is closable prior to the inauguration of the active stroke of the pump plungenand automatic means for opening said valve during the delivery stroke of the pump plunger and at some predetermined period before the completion of said stroke, whereby apredetermined quantity of liquid will be delivered from the pump cylinder at each stroke of the pump plunger.

. 8. In a reciprocating pump adapted to discharge liquid from a pot to a receptacle, the combination of a pump cylinder located in the pot, a pump plunger therein, an inlet and outlet valve located adjacent the top of the `cylinder to insure that the cylinder at each operation of the pump plunger is filled to capacity when the pump plunger is at the lower end ofits stroke notwithstanding variations in the level of the liquid in the pot and which is closable prior to the inauguration of the active stroke of the pump plunger, means for vreciprocating said pump plunger, with mechanism whereby said reciprocating means causes said valve to open during. the delivery stroke of the pump plunger and a-t some predetermined period before the completion of said stroke, whereby a predetermined quantity of liquid will be delivered from the pump cylinder at each stroke of Ithe pump plunger.

9. In a reciprocating pump adapted to j discharge liquid from a pct to a receptacle, the combination of a pump cylinder located in the pot, a pump plunger therein, an inlet and outlet valve located adjacent the top of the cylinder to insure that the cylinder at each operation of the pump plunger is iilled to capacity When the pump plunger is at the lower end of its stroke notwithstanding variations in the level of the liquid in the pot and which is closable prior to the inauguration of the active stroke of the pump plunger, anda pump lever connected to said pump plunger and having an adjustable stop thereon, with means engaged by said stop to open said valve during the delivery stroke ofthe pump plunger and at some predetermined period before the completion of said stroke, whereby a predetermined quantity of liquid will be delivered from the pump cylinder at each stroke of the pump plunger.

10. In a reciprocating pump adapted to discharge liquid from a pot to a receptacle, the combination of a pump cylinder located in the pot, a pump plunger therein, an inlet and outlet valve located adjacent the top of the cylinder to insure that the cylinder at each operation of the pump plunger is lled to capacity when the pump plunger is at the lower end of its stroke notwithstanding variations in the level of the liquid in the pot and which is closable prior to the inauguration of the active stroke of the pump plunger, a valve operating rod, a pump lever connected to said pump plunger and having an adjustable Astop Y thereon, and a valve adjusting rod connected by levers to said valve operating rod, said stop engaging said valve adjusting rod to open said valve during the delivery stroke of the pump plunger and at some predetermined period before the completion of said stroke, whereby a predetermined quantity of liquid will be delivered from the pump cylinder at each stroke of 4the pump plunger.

11. In a reciprocating pump adapted to discharge liquid from a poty to a receptacle, the combination of a pump cylinder located in the pot, a pump plunger therein, an inlet and outlet valve located adjacent the top of the cylinder to insure that the cylinder at each operation of the pump plunger is lled to capacity when the pump g `plunger is at the lower end of its stroke notwith- Y valve during the delivery stroke of the pump plunger and atv some predetermined period before the completion of said stroke, whereby a predetermined quantity of liquid will be delivered from the pump cylinder at each stroke of the pump plunger.

l2. In a reciprocating pump adapted to: discharge liquidV from a pot to a receptacle, the combination of a pumpl cylinder located in the pot,.` a pump plunger therein, an inlet andi outlet valve located adjacent the top ofthe cylinder to insure that the cylinder at each operation lof the pump plunger is filled to capacity when the pu-mp plunger is at the lower end of its stroke notwithstanding variations in the level of the liquid in the pot, a valve'operating rod, a manually operated pump lever connected to said pump plunger and having an adjustable stop thereon, a valve .adjusting rod connected by levers to said valve operating rod, said stop engaging said adjusting rod to open said valve duringv the delivery stroke of the pump plunger and at some predetermined period before the completion of said stroke, whereby a predetermined quantity of liquid will be delivered from the pump cylinder at each stroke of the pump plunger, and a manual control on one oi said levers for closing said valve.

13.'In a reciprocating pump adapted to discharge liquid from a pot to a receptacle, the combination of a pump cylinder located in the pot, a pump plunger therein, an inlet and outlet valve located adjacent the top of the cylinder to Y insure that the cylinder at each operation of the pump plunger is lled to capacity when the pump plunger is at the lower end' or" its stroke notwithstanding variations in the level of the liquid in .the pot, manual means for closing said valve, power operated means for reciprocating said plunger and mechanism whereby said reciprocating means causes said valve to open during the delivery stroke of the pump plunger and at some predetermined period before the completion of said stroke, whereby a predetermined quantity of liquid will be delivered from the pump cylinder at each stroke of the pump plunger.

' 14. In a reciprocating pump adapted toV discharge liquid. from a pot to a receptacle, the combination o f a pump cylinder located in the pot, a pump plunger therein, an inlet and outlet valve located adjacent the top of the cylinder to insure that the cylinder at each operation of the pump plunger is filled to capacity whenthe pump plunger is at the lower end of its stroke notwithstanding variations in the level of the liquid in the pot, manual means for closing said valve, a

pump lever connected to said pump plunger and havingv an adjustable stop thereon, power operated means for actuating said pump lever, means valve located adjacent the top of the cylinder to insure that the cylinder at each operation of the pump plunger is-lled to capacity when Ythe pump plunger is at the lower-end of its stroke notwithstanding variations. in the level oi the liquid. in

the; pot,v power operated means for reciprocating said. plunger, mechanism. whereby said recprocating meanscauses said valve to open during the delivery stroke of. the pump plunger and at some predetermined period beforeV the completion of said: stro-ke, whereby a predetermined quantity of liquid will be deliveredl from the pump cylinder at each stroke of the pump plunger, and a common. manual control. for closing said valve and setting said powerr operated means in motion.

1'61. In. a reciprocating pumpV adapted to discharge liquid. from a pot to a receptacle, the combi-nation of a pump cylinder located in the pot, a pump plunger therein, an inlet and outlet valve located adjacent the top of the cylinder to insure that the cylinder at each operation of. the pump plunger is lledto capacity when the pump plunger is at the lower end of its stroke notwithstanding. variations in the level of the liquid in the pot, power operated means for reciprocating said plunger, mechanism whereby said reciprocating means. causes said valve to open during the delivery stroke of the pump plunger and at some predetermined period before the completion of said stroke, whereby a predetermined quantityV of liquid will be delivered from the pump cylinder at each stroke of the pump plunger, a common manual control for closing said valve and setting said power operated means in motion and automatic means for disconnecting said power operated means on completion of an upward and downward stroke of the'pump plunger.' Y

17. In a reciprocating pump adapted to discharge liquid from a pot to a receptacle, the combination of a pump cylinder located in the pot, a pump plunger'therein, an inlet and outlet valve located adjacent the top of the cylinder to insure that the cylinder at each operation of the pump plunger is-lled to capacity whenV the pump plunger is4 at the lower end of its stroke notwithstanding variations in the level of the liquid in the pot, a pump lever connected to said pump plunger having an adjustable stop thereon, means engaged-by said stop to open said valve during the delivery stroke of the pump plunger' and at some predetermined period before the completion ot said stroke, whereby a predetermined quantity of liquid will be delivered from the pump cylinder at each stroke of the pump plunger', power operated means for actuating said pump lever, a common manual control for closing said valve and setting said power operated means in motion and automa-tic means for disconnecting said power operated means on completion of an upward and downward strokeofV the pump plunger;

18', In a reciprocating pump adapted to discharge liquid from a pot to -a receptacle, the combination of' a pump cylinder located in the pot, a pump plunger therein, said cylinder at each operation ofthe pump plunger being filled toV capacity when said plunger is at the lower end Vof' its stroke notwithstanding variations in the level ofv thev liquid in the pot, a by-pass valve in the pum-p cylinder, and automatic means for opening said valve during the delivery stroke of the pump plunger and at Sonie predetermined period beto-re the completion oiA saidstroke, whereby a predetermined quantity of liquid will be delivered from the pump cylinder at each stroke of the pump plunger.

WILLIAM GERHARD. WALTER HARRIS..

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