US2651996A - Pump motor controller - Google Patents

Pump motor controller Download PDF

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US2651996A
US2651996A US180132A US18013250A US2651996A US 2651996 A US2651996 A US 2651996A US 180132 A US180132 A US 180132A US 18013250 A US18013250 A US 18013250A US 2651996 A US2651996 A US 2651996A
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solenoid
switch
pump
speed control
source
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US180132A
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Donald R Nahmens
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/06—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for stopping, starting, idling or no-load operation

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  • This invention relates to improvements in pump motor controllers and more particularly to motor controllers for oil tank truck pumps.
  • Oil tank trucks are usually provided with positive displacement gear type pumps for pumping oil from the truck tank, through a flexible hose having a shut-oil nozzle valve at the delivery end thereof, and into residence oil storage tanks or the like.
  • These pumps are usually driven directly by the engine of the truck through a power take oh, the pumping speed of the engine being con siderably higher than the normal idling speed thereof.
  • the speed of the engine is usually controlled by a hand throttle located in the truck cab.
  • Oil pumps of the positive displacement type are usually provided with a conventional spring loaded pressure relief bypass valve which, when open, provides communication between the discharge side of the pump and the inlet side of the pump.
  • This communication is ordinarily of considerably smaller cross sectional area than that of the outlet connection of the pump.
  • the bypass valve cannot accomodate all of the discharge from the pump without high pressures being built up within the pump which cause much objectionable vibration.
  • This vibration actually shakes loose the fittings on the pump and adjacent equipment, thereby causing leakage, and requiring frequent tightening of said fittings. of this vibration the pumping speed of the engine and of the pump must be kept lower than the pumps maximum efiicient pumping speed, in order to keep the vibration down below the actual danger point.
  • a number of control devices have been de veloped in an attempt to solve the problem presented by this type of p imp vibration. Certain of these devices depend. upon engine vacuum for operation, and have notbeen entirely satisfactory because of the fact that engine vacuum is of such a fluctuating nature. Certain of the previous devices also required; a fluid conduit extending to the engine carburetor, as well as a vacuum line extending to the intake manifold. These conduits extended from the engine back to the meter compartment of the truck. In addition, the prior control devices are not readily adaptable to all makes of pumps.
  • a further object of the invention is to provide an engine controller which automatically slows a pump motor to idling speed when the delivery nozzle valve of said pump is closed, and which speeds the motor up to pumping speed upon opening of the delivery valve.
  • a further object of the invention is to provide an improved pump motor controller of the class described which, by reason of the fact that it eliminates objectionable vibration, greatly reduces wear and permits the pump to be run at its maximum efficient speed during pumping, to thereby increase the output of the pump and decrease pumping time.
  • a further object of the invention is to provide an improved pump motor controller of the class described, the major portion of which can be mounted under the hood of the truck or behind the dashboard thereof and which requires two wires only to extend from this portion of the device to the remainder thereof normally located in the hose reel compartment.
  • a more specific object of the invention is to provide an improved device of the class described which is responsive to the pressure on the discharge side of the pump, said pressure actuating electrical pressure switches which form part of an electrical control circuit with a pair of motor throttle actuating solenoids.
  • a further object of the invention is to provide an improved motor controller of the class described which is readily adaptable for use on all oil tank trucks regardless of the type of pumps thereon.
  • a further object of the invention is to provide an improved electrical motor controller which is economical in its consumption of electrical power.
  • a further object of the invention is to provide an improved controller of the class described which is relatively simple in construction, which is inexpensive to manufacture, easy to install, and which is otherwise well adapted for the purposes described.
  • the invention consists of the improved pump motor controller and all of its parts and combinations as set forth in the claims and all equivalents thereof.
  • Fig. 1 is a semi-diagrammatic plan view of the preferred form of the improved controller in idling position
  • Fig. 2 is a view similar to Fig. 1 showing the improved controller in pumping position
  • Fig. 3 is a fragmentary view taken through the improved controller approximately along the line 3-3 of Fig. 1.
  • Fig. 4 is a fragmentary longitudinal vertic sectional view of a portion of the improved controller taken approximately along the line 4-4 of Fig. 1;
  • Fig. 5 is a semi-diagrammatic plan view of a modified form of the invention in idlin position
  • Fig. 6 is a view similar to Fig. 5 but showing the modified controller in pumping position
  • Fig. 7 is a fragmentary rear end View of a tank truck rear end hose reel compartment showing the door operated switch
  • Fig. 8 is a fragmentary side view on a reduced scale of the oil pumping system of an oil tank truck, the outline of said truck being shown in dotted lines.
  • the numeral 83 indicates an oil tank truck having mounted thereon an oil tank 89.
  • the truck 88 is provided with an engine 90 having a speed con trol or throttle arm 39 which may be connected to the engine carburetor.
  • a rod 40 connects the arm 39 to the accelerator (not shown) of the truck 88 and said arm is provided with a te sion spring I39 for urging said arm toward idling position.
  • the engine 90 has a drive shaft 9
  • Mounted in a compartment 53 at the rear of the tank 89 is a hose reel 95 on which is normally coiled a flexible delivery hose 96.
  • the hose 96 is provided at its terminus with a manual shut off nozzle valve 91.
  • a positive displacement pump 98 has its inlet connection 99 communicating with the interior of the tank 89 and has its discharge connection I communicating with a meter NH.
  • is connected to the hose 96 through a conduit I02 and the reel 95 in the usual manner.
  • the numeral I0 indicates a base plate on which are mounted a pair of coaxial spaced solenoids II and I2.
  • the solenoids II- and I2 are provided with plungers I3 and I4 respectively which are axially and non-rotatably movable therein.
  • the adj cent ends of the plungers I3 and I4 are connected to opposite ends of a rectangular cam plate E5, as by bolts I6.
  • the cam plate I is formed with a slot I! having end portions 1 adjacent opposite side edges thereof and extending parallel with the axis of the plungers.
  • the end portions I8 are connected by a diagonally extending intermediate slot portion
  • a normally closed switch 29 having a pair of contacts 2
  • a normally closed electric switch 23 mounteded on the opposite end of the base I ii, adjacent the outer end of the solenoid I2 and in a position to be actuated by the plunger I 4, is a normally closed electric switch 23 having a pair of contacts 24 and 25.
  • a transversely extending inverted channel shaped member 26- The member 26 is formed with a slot 2! extending longitudinally thereof along the center line of its upper wall.
  • the slot 21 is preferably Wider than the slot I'I.
  • Slidably positioned on the base I0 under the inverted channel member 26 is a slidable bar 28 which is preferably rectangular in cross section, as shown.
  • An upstanding cylindrical pin 29 is bolted to the upp surface of the slide bar 28 and extends through the slot 21 in the member 26.
  • the pin 29 is formed with a portion 30 having a diameter substantially equal to the width of the slot 2'! and is formed with a portion of reduced diameter 3
  • of the pin 29 extends through the slot H, as shown in Fig. 3, and the cam plate I5 rests on the shoulder 32.
  • the pin 29 is formed with a diametrically extending bore 33 in which is positioned the end of a wire 34.
  • the pin 29 is formed with a tapped axially extending aperture 35 in which is positioned a, set screw 36 for locking the wire 34 in the bore 33.
  • the wire 34 is provided with a metallic tubular sheath 31 in which it is slidable, and a bracket 38 securely positions one end of the sheath 3'! adjacent an end of the slide member 26, as shown.
  • the numeral 39 indicates the speed control or throttle arm on the carburetor of the motor of the truck on which the improved controller is shown as being mounted.
  • An accelerator rod 40 is pivotally connected to the arm 39, and depression of the accelerator (not shown) moves the rod 40 axially to thereby pivot the arm 39 in the usual manner from the solid line idle position of Fig. 1 toward the dot and dash line faster running position of Fig. 1.
  • may be fixed to the rod 40 and is formed with a bore 42 which is parallel with the rod 40.
  • the wire 34 extends slidably through the bore 42 and has fixed to the end thereof a collar 43.
  • the arm 39 and the rod 40 are normally urged toward the idle position, as shown in Fig. 1, by the spring I39.
  • the numerals 44 and 45 indicate a pair of pressure switches, said switches communicating with a common T conduit 46 which is in communication with the discharge pressure of the oil pump and may be connected to the conduit I02 of the oil tank truck, as shown in Fig. 8.
  • the pressure switch 44 has a pair of contacts 4! and 48 which are closed when the pressure in the conduits 46 and I02 exceeds a predetermined value, for example pounds.
  • the contacts 41 and 48 are opened when the pressure in the conduits 46 and I02 falls below the predetermined pressure.
  • the pressure switch 45 has a pair of contacts 49 and 50 which are opened by pressure in conduits 46 and I02 above a predetermined value which is preferably less than the pressure setting of the switch 44, for example 40 pounds, and are closed when the pressure in said conduits falls below said predetermined value.
  • the pressure switches 44 and 45 are preferably adjustable so that the pressure of actuation may be varied to suit individual pump characteristics.
  • indicates a manually operated single pole single throw switch preferably located in the cab of the truck 88.
  • the numeral 52 indicates a. normally closed push button type switch which is. preferably located in; the hose.
  • compartment 53 in a position to. be actuated. by
  • the numeral 56 indicates: the battery of the truck 88.
  • a wire 51 connects: the
  • contacts are and 49 with one side ofthe switch 5!. series and are connected to one side of the. battery 56.
  • A. wire 58 connects the contacts ll. and 21, and a wire 59 connects the contacts 58' and 24.
  • One wire 55 of the solenoid H is connected: to the contact 22, and onewire iii of the solenoid.
  • the second wire 62 of the solenoid i I is connectedto the secnd wire 53 of the solenoid l2, and said wiresare connected by a wire 64 to the other side of the battery 56.
  • switch 5i is closed by the operator and the power take off for operating the pump is engaged, the engine accelerator being und'epressed so that the engine idles and the rod 40 and lever 39. are positioned by the spring I39 as shown in Fig. 1.v
  • the switch 52 Upon opening the door of. the hose reel compartment 53, the switch 52 automatically closes. to complete the circuit to the battery 55 and.
  • the bypass valve of the pump 98 can accommodate all of the oil being pumped by the pump without vibration.
  • the pressure in the hose 96, and consequently also the conduits t6 and ace is above the predetermined pressure necessary to close the contacts. of the switch 44', and to open the contacts of the switch 45, as shown in Fig. 1.
  • the engine is speeded up so that it drivestheoilpumpat a predetermined-speed: which is preferablyitsmaximum efficient pumping speed;
  • FIG. 1 A modified form of the invention, which is adapted for use on larger trucks, is shown in Figs. and 6.
  • the numeral It indicates an L-shaped base upon which is mounted a pair of solenoids I I and I 2 disposed in spaced relation at substantially a right angle with respect to each other.
  • a normally closed switch is mounted adjacent one end of the solenoid II in a position to be actuated by the plunger I3 of said solenoid.
  • a normally closed switch 23 is mounted adjacent an end of the solenoid I2 in a position to be actuated by the plunger I4 of said solenoid.
  • a pair of pressure switches 44 and 45 preferably identical with the pressure switches 44 and 45 of the preferred form of the invention, are connected to a common T conduit 46 which may communicate with the conduit I02 of the truck 88.
  • and 52 are identical with the switches 5
  • the wiring diagram of the modified form of the invention is preferably identical with that of the preferred form, and the electric conductors indicated by primed numerals in Figs. 5 and 6 are identical with those indicated by the same numbers unprimed in Figs. 1 and 2.
  • a bracket ID Fixed to the base IB and spaced from the adjacent ends of the solenoids II and I 2 is a bracket ID on which is pivotally mounted, for movement in a plane parallel with the base IE3, a pawl or detent "II
  • the pawl 'II is formed along one edge SI, at the end thereof adjacent the solenoid I2, with a notched out portion I2 forming a shoulder 13.
  • the pawl TI is formed with an apertured ear 14.
  • the ear F4 is connected to an ear I5 on the solenoid II by a coiled tension spring 16 which normally urges the pawl II in a clockwise direction about its pivot H.
  • the plunger I3 of the solenoid II is linked to the end portion of the pawl II adjacent the notch 12 by means of a link 18.
  • a second bracket I9 is mounted on the base Ill, and pivotally mounted on the bracket I9 for movement coplaner with the pawl II is a lever 89.
  • the lever 83 is positioned so that one end thereof is engageable with the edge SI of the pawl II.
  • This end of the lever 80 is linked to the adjacent end of the plunger I4 of the solenoid I2 by means of a link 82.
  • a coil tension spring 83 connects the opposite end portion of the lever 80 with an ear 64 on the solenoid l2 and normally urges the lever 80 in a counter-clockwise direction about its pivot 85. Counter-clockwise movement of the lever 80 is limited by a set screw 86 extending through a block 81 carried by the bracket Hi.
  • the end of the lever 80 adjacent the spring 83 is pivotally connected to a throttle rod 34' which slidably extends through a bore 42 in a block 4
  • the rod 34' has fixed thereto a collar 43, and movement is transmitted from the rod 34 to the accelerator rod 48' and the throttle arm 39 in the same manner that movement is transmitted from the wire 34 to the arm 39 in the preferred form.
  • Fig. 5 shows the parts of the modified form of the invention disposed in idle position.
  • the pressure in the conduit I02 and in the delivery hose 96 drops below 40 pounds, causing the switch 44 to open and the switch 45 to close.
  • Current then flows from the battery 56 through the switches 52, 5
  • This movement of the plunger I4 pivots the lever in a counter-clockwise direction against the tension of the spring 83 and moves the throttle rod 34 to the left thereby causing the throttle arm 39 to be swung to the left to pumping position shown in Fig. 2.
  • the truck engine is thereby speeded up to pumping speed.
  • the pawl II is pivoted in a clockwise direction by the tension spring 76 to thereby move the shoulder 73 and the notch I2 into engagement with the end of the lever 80, as shown in Fig. 6, thereby locking said lever in this position.
  • the plunger I3 of the solenoid I I is moved toward said pawl and away from the switch 26', permitting the contacts of said switch to close.
  • the plunger I4 is moved therewith to permit the contacts or" the switch 23 to close. Retraction of the plunger I3 opens the contacts of the switch 20, as shown, and deenergizes the solenoid II to thereby pre vent it from heating up and from drawing further current.
  • the accelerator rod 40 and the throttle arm 39' are permitted to return to idle position under the urging of the spring I39. This slows down the engine 90 and the pump 98 to idling speed, and the parts of the improved controller will remain as shown in Fig. 1 until the discharge nozzle 91 is again opened, at which time the improved controller will again automatically speed up the truck engine 99 and the pump 98 to pumping speed.
  • a fluid pump having a discharge line provided with a normally closed shutoff valve, said discharge line normally containing fluid under pressure when said pump is opcrating; a motor drivingly connected to said pump and having a speedcontrol lever normally in idling position, said lever being movable between idling and pumping positions; a source of electrical current; a solenoid connected to said speed control lever in a manner to move said lever to pumping position when said solenoid is energized; a first .pressure switch connected to said source of current and to said solenoid and responsive toa predetermined pressure in said discharge line to cause energization of said solenoid and movement .of the speed control lever to pumping position; mechanism actuated by a second solenoid connected to said source of current for moving said speed control lever to idling position when said second solenoid is energized; and a second pressure switch responsive to a predetermined higher pressure in said discharge line to cause energization of said second solenoid and movement of the speed control
  • a fluid.pumphavingadis chargeline provided with alnormally closedshutofi valve, said discharge line normally containing fluid under pressure when said pump is operating; a motor drivingly connected to saidpump and having a speed control lever normally in idling position, said lever being movable between idling and pumping positions; a source-of electrical current; a solenoid connected to said speed control lever in a manner to move said lever to pumping position when said solenoid is energized; a first pressure switch connected to said source of current and to said solenoid and responsiveto a predetermined pressure in said discharge line to cause energization of said solenoid and movement of the speed control leverto pumping position; mechanism actuated by a second solenoid connected to said source of current for moving said speed control lever to idling position when said second solenoid is energized; a second pressure switch .responsive to a predetermined higher pressure in said discharge line to cause energization of said second solenoidand movement
  • a fluid pump having a discharge lineprovided with a normally closed shutoff valve, saiddisc'harge line normally containing fluid under pressure when said pump is operat ing; a motor drivingly connected to said pump and having a speed control lever normally in idling position, said lever being movable'between idling and pumping positions; a source of electrical current; a solenoid connected to saidspeed control lever in a manner to move said lever to pumping position when said solenoid is energized; a first pressure switch connected 'to said source of current and to said solenoid and responsive to a predetermined pressure in said discharge line to cause energization of said solenoid and movement of the speed control lever to pumping position; mechanism actuated by'a second solenoid connected to said source of current for moving said speed control lever to idling position when said second solenoid is-energized; a second pressure switch responsive to-a predetermined higher pressure in said discharge line tocause energization of said second solenoid and movement of
  • a fluid pump having a discharge line provided with a normally closed shutoif valve, said discharge line normally contain- :ing 'iluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control member movable between idling pumping positions, said member being normally in idling position; a source of electric current; a first electric power means connected to said speed control member in a manner to move the latter to pumping position when said power means is energized; a second electric power means; mechanism including said second electric power means for moving said speed control member to idling position when said second power means is energized; and pressure responsive switch :mean connected to said source and'to said first and second electric power means for providing alternative electrical con- .nection of said source with either said first or second power means, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first power means to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to
  • a fluid pump having a discharge line provided with a normally closed shutoii' valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control member movable between idling and pumping positions, said member being normally in idling position; a source of electric current; .a first solenoid connected to said speed controlmember in a manner to move the latter to pumping position when said solenoid is energized; a second solenoid; mechanism including said second solenoid for moving said speed control member to idling position when said second solenoid is energized; and pressure responsive switch means connected to said source and to said first and second solenoids for providing alternative electrical connection of said source with either said first or second solenoids, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first solenoid to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to .a predetermined higher pressure in the discharge
  • a fluid pump having a discharge line provided with a normally closed shutoff valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control member movable between idling and pumping positions, said member being normally in idling position; a source of electric current; a first electric power means connected to said speed control member in a manner to move the latter to pumping position when said power means is energized; a second electric power means; mechanism including said second electric power means for moving said speed control member to idling position when said second power means is energized; pressure responsive switch means connected to said source and to said first and second electric power means for providing alternative electrical connection of said source with either said first or second power means, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first power means to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to a predetermined higher pressure in the discharge line to connect said source with the second power means
  • a fluid pump having a discharge line provided with a normally closed shutoff valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control membermovable between idling and pumping positions, said member being normally in idling position; a source of electric current; a first solenoid connected to said speed control member in a manner to move the latter to pumping position when said solenoid is energized; a second said second solenoid for moving said speed control member to idling position when said second solenoid is energized; pressure responsive switch means connected to said source and to said first and second solenoids for providing alternative electrical connection of said source with either said first or second solenoids, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first solenoid to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to a predetermined higher pressure in the discharge line to alternatively connect said source with the second
  • a fluid pump having a discharge line provided with a normally closed shutoff valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control member movable between idling and pumping positions, said member being normally in idling position; a source of electric current; a first solenoid connected to said speed control member in a manner to move the latter to pumping position when said solenoid is energized; a second solenoid connected to said speed solenoid; mechanism including control member in a manner to move the latter to idling position when said second solenoid is energized; and pressure responsive switch means connected to said source and to said first and second solenoids for providing alternative electrical connection of said source with either said first or second solenoids, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first solenoid to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to a predetermined higher pressure in the
  • a fluid pump having a discharge line provided with a normally closed shutoff Valve, said discharge line normally containing fluid under pressure when said pLunp is operated; a motor drivingly connected to said pump and having a speed control member movable between idling and pumping positions, said member being normally in idling position; a movable cam; a cam follower connected to said speed control member in a manner to move the latter between idling and running positions in response to movement of said cam; a first solenoid connected to said cam in a manner to move the latter in a direction to cause movement of the speed control member toward pumping position upon energizetion of said solenoid; a second solenoid connected to said cam in a manner to move the latter in a direction to cause movement of the speed control member toward idling position upon energization of said second solenoid; a source of electric current; and pressure responsive switch means connected to said source and to said first and second solenoids for providing alternative electrical connection of said source with either said first
  • a fluid pump having a discharge line provided with a normally closed shutoff valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control member movable between idling and pumping positions, said member being normally in idling position; a movable cam plate formed with a diagonally extending cam slot; a cam follower positioned in said slot and movable transversely in response to longitudinal movement of said plate, said follower being connected to said speed control member in a manner to move the latter between idling and running positions in response to longitudinal movement of said cam plate; a first solenoid connected to said cam in a manner to move the latter in one longitudinal direction to cause movement of the speed control member toward pumping position upon energization of said solenoid; a second solenoid connected to said cam in a manner to move the latter in the opposite longitudinal direction to cause movement of the speed control member toward idling position upon energization of said second solenoid;
  • a fluid pump having a discharge line provided with a normally closed shutoff valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control member movable between idling and pumping positions, said member being normally in idling position; a lever connected to said speed control member and movable therewith between idling and pumping positions; a source of electric current; a first solenoid connected to said lever in a manner to move the latter to pumping position upon energization of said solenoid; movable detent means engageable with Iii said lever upo'n movement of said lever to pumping position to hold said lever and hence the speed control member, in pumping position; a second solenoid connected to said detent means in a manner to release said detent means and permit movement of said lever and speed control member to idling position upon energization of said second solenoid; and pressure responsive switch means connected to said source and to said first and second solenoids
  • a fluid pump having a discharge line provided with a normally closed shutoff valve, said discharge line normally containing fluid under pressure when said pump is operated; 3, motor drivingl connected to said pump and having a speed control member movable between idling pumping positions, said member being normally in idling position; a lever connected to said control member and movable therewith between g and pumping positions and being spring u ged toward idling position; a source of electric current; a first solenoid connee ed to said lever in a manner to move the latter to pumping position upon energization of solenoid; a spring loaded detent mounted for engagement with said lever upon movement of said lever to pumping position to hold said lever, and hence the speed control member, in pumping position; a second solenoid connected to said detent in a manner to release said detent and permit movement of said lever and speed control member to idling position upon energization of said second solenoid; and pressure responsive switch means connected to said source and to
  • a fluid pump having a discharge line provided with a normally closed shutofi valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control member movable between idling and pumping positions, said member being normally in idling position; a source of electric current; a first electric power means connected to said speed control member in a manner to move the latter to pumping position when said power means is energized; a second electric power means; mechanism including said second electric power means for moving said speed control memher to idling position when said second power means is energized; pressure responsive switch means connected to said source and to said first and second electric power means for providing alternative electrical connection of said source,
  • said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first power means to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to a predetermined higher pressure in the discharge line to alternatively connect said source with the second power means to energize said second power means and move the speed control member to idling position; and a normally closed shut-off switch in the line between said source and said pressure responsive switch means for preventing the flow of current to said switch means and to said first and second power means when said switch is opened.
  • a fluid pump having a discharge line provided with a normally closed shutoiT valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a. speed control member movable between idling and pumping positions, said member being normally in idling position; a source of electric current; a first electric power means connected to said speed control member in a manner to move the latter to pumping position when said power means is energized; a second electric power means; mechanism including said second electric power means for moving said speed control mem- 16 her to idling position when said second power means is energized; pressure responsive switch means connected to said source and to said first and second electric power means'for providing alternative electrical connection of said source with either said first or second power means, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first power means to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to a predetermined higher pressure in the discharge line to

Description

Sept. 15, 1953 D. R. NAHMENS 2,651,996
PUMP MOTOR CONTROLLER Filed Aug. 18, 1950 2 Sheets-Sheet l 1977'0E/VEVS.
Sep 1953 D. R. NAHMENS 2,651,996
PUMP MOTOR CONTROLLER Filed Aug. 18, 1950 2 Sheets-Sheet 2 IN V EN TOR. 0902M Q. 72%,
H TWO/ENE Patented Sept. 15, 1953 OFFICE PUMP MOTOR CONTROLLER Donald R. Nahmens, Milwaukee, Wis.
Application August 18, 1950, Serial No. 180,132
15 Claims. 1
This invention relates to improvements in pump motor controllers and more particularly to motor controllers for oil tank truck pumps.
Oil tank trucks are usually provided with positive displacement gear type pumps for pumping oil from the truck tank, through a flexible hose having a shut-oil nozzle valve at the delivery end thereof, and into residence oil storage tanks or the like. These pumps are usually driven directly by the engine of the truck through a power take oh, the pumping speed of the engine being con siderably higher than the normal idling speed thereof. The speed of the engine is usually controlled by a hand throttle located in the truck cab.
Oil pumps of the positive displacement type are usually provided with a conventional spring loaded pressure relief bypass valve which, when open, provides communication between the discharge side of the pump and the inlet side of the pump. This communication, however, is ordinarily of considerably smaller cross sectional area than that of the outlet connection of the pump. As a result, when the engine and the pump are run at pumping speed and the hose nozzle is closed, the bypass valve cannot accomodate all of the discharge from the pump without high pressures being built up within the pump which cause much objectionable vibration. This vibration actually shakes loose the fittings on the pump and adjacent equipment, thereby causing leakage, and requiring frequent tightening of said fittings. of this vibration the pumping speed of the engine and of the pump must be kept lower than the pumps maximum efiicient pumping speed, in order to keep the vibration down below the actual danger point.
A number of control devices have been de veloped in an attempt to solve the problem presented by this type of p imp vibration. Certain of these devices depend. upon engine vacuum for operation, and have notbeen entirely satisfactory because of the fact that engine vacuum is of such a fluctuating nature. Certain of the previous devices also required; a fluid conduit extending to the engine carburetor, as well as a vacuum line extending to the intake manifold. These conduits extended from the engine back to the meter compartment of the truck. In addition, the prior control devices are not readily adaptable to all makes of pumps.
With the above in mind it is a principal object of the present invention to provide means for eliminating the objectionable vibration which is set up in a positive displacement pump when the 2: discharge conduit thereof is shut oil and while the motor and pump are running at pumping speed.
A further object of the invention is to provide an engine controller which automatically slows a pump motor to idling speed when the delivery nozzle valve of said pump is closed, and which speeds the motor up to pumping speed upon opening of the delivery valve.
A further object of the invention is to provide an improved pump motor controller of the class described which, by reason of the fact that it eliminates objectionable vibration, greatly reduces wear and permits the pump to be run at its maximum efficient speed during pumping, to thereby increase the output of the pump and decrease pumping time.
A further object of the invention is to provide an improved pump motor controller of the class described, the major portion of which can be mounted under the hood of the truck or behind the dashboard thereof and which requires two wires only to extend from this portion of the device to the remainder thereof normally located in the hose reel compartment.
A more specific object of the invention is to provide an improved device of the class described which is responsive to the pressure on the discharge side of the pump, said pressure actuating electrical pressure switches which form part of an electrical control circuit with a pair of motor throttle actuating solenoids.
A further object of the invention is to provide an improved motor controller of the class described which is readily adaptable for use on all oil tank trucks regardless of the type of pumps thereon.
A further object of the invention is to provide an improved electrical motor controller which is economical in its consumption of electrical power.
A further object of the invention is to provide an improved controller of the class described which is relatively simple in construction, which is inexpensive to manufacture, easy to install, and which is otherwise well adapted for the purposes described.
With the above and other objects in View, the invention consists of the improved pump motor controller and all of its parts and combinations as set forth in the claims and all equivalents thereof.
In the drawings accompanying and forming a part of this specification, wherein are shown two embodiments of the invention and wherein 3 like characters of reference indicate the same parts in all of the views:
Fig. 1 is a semi-diagrammatic plan view of the preferred form of the improved controller in idling position;
Fig. 2 is a view similar to Fig. 1 showing the improved controller in pumping position;
Fig. 3 is a fragmentary view taken through the improved controller approximately along the line 3-3 of Fig. 1.
Fig. 4 is a fragmentary longitudinal vertic sectional view of a portion of the improved controller taken approximately along the line 4-4 of Fig. 1;
Fig. 5 is a semi-diagrammatic plan view of a modified form of the invention in idlin position;
Fig. 6 is a view similar to Fig. 5 but showing the modified controller in pumping position;
Fig. 7 is a fragmentary rear end View of a tank truck rear end hose reel compartment showing the door operated switch; and
Fig. 8 is a fragmentary side view on a reduced scale of the oil pumping system of an oil tank truck, the outline of said truck being shown in dotted lines.
Referring more particularly to Fig. 8, the numeral 83 indicates an oil tank truck having mounted thereon an oil tank 89. The truck 88 is provided with an engine 90 having a speed con trol or throttle arm 39 which may be connected to the engine carburetor. A rod 40 connects the arm 39 to the accelerator (not shown) of the truck 88 and said arm is provided with a te sion spring I39 for urging said arm toward idling position. The engine 90 has a drive shaft 9| for driving a power take off unit 92 which may be engaged or disengaged by means of a lever 93. Mounted in a compartment 53 at the rear of the tank 89 is a hose reel 95 on which is normally coiled a flexible delivery hose 96. The hose 96 is provided at its terminus with a manual shut off nozzle valve 91. A positive displacement pump 98 has its inlet connection 99 communicating with the interior of the tank 89 and has its discharge connection I communicating with a meter NH. The meter |'0| is connected to the hose 96 through a conduit I02 and the reel 95 in the usual manner.
Referring to Fig. 1 of the drawing, the numeral I0 indicates a base plate on which are mounted a pair of coaxial spaced solenoids II and I2. The solenoids II- and I2 are provided with plungers I3 and I4 respectively which are axially and non-rotatably movable therein. The adj cent ends of the plungers I3 and I4 are connected to opposite ends of a rectangular cam plate E5, as by bolts I6. The cam plate I is formed with a slot I! having end portions 1 adjacent opposite side edges thereof and extending parallel with the axis of the plungers. The end portions I8 are connected by a diagonally extending intermediate slot portion |9,, as shown.
Mounted on the base I0, adjacent the outer end of the solenoid Ii and in a position to be actuated by the outer end of the plunger I3 is a normally closed switch 29 having a pair of contacts 2| and 22. Mounted on the opposite end of the base I ii, adjacent the outer end of the solenoid I2 and in a position to be actuated by the plunger I 4, is a normally closed electric switch 23 having a pair of contacts 24 and 25.
Bolted onto the base I0 is a transversely extending inverted channel shaped member 26- The member 26 is formed with a slot 2! extending longitudinally thereof along the center line of its upper wall. The slot 21 is preferably Wider than the slot I'I. Slidably positioned on the base I0 under the inverted channel member 26 is a slidable bar 28 which is preferably rectangular in cross section, as shown. An upstanding cylindrical pin 29 is bolted to the upp surface of the slide bar 28 and extends through the slot 21 in the member 26. The pin 29 is formed with a portion 30 having a diameter substantially equal to the width of the slot 2'! and is formed with a portion of reduced diameter 3|, the diameter of which is substantially equal to the width of the slot I1. Between the portions 30 and 3| the pin 29 is provided with a shoulder 32.
The portion 3| of the pin 29 extends through the slot H, as shown in Fig. 3, and the cam plate I5 rests on the shoulder 32. Below the shoulder 32 the pin 29 is formed with a diametrically extending bore 33 in which is positioned the end of a wire 34. The pin 29 is formed with a tapped axially extending aperture 35 in which is positioned a, set screw 36 for locking the wire 34 in the bore 33. The wire 34 is provided with a metallic tubular sheath 31 in which it is slidable, and a bracket 38 securely positions one end of the sheath 3'! adjacent an end of the slide member 26, as shown.
The numeral 39 indicates the speed control or throttle arm on the carburetor of the motor of the truck on which the improved controller is shown as being mounted. An accelerator rod 40 is pivotally connected to the arm 39, and depression of the accelerator (not shown) moves the rod 40 axially to thereby pivot the arm 39 in the usual manner from the solid line idle position of Fig. 1 toward the dot and dash line faster running position of Fig. 1. A block 4| may be fixed to the rod 40 and is formed with a bore 42 which is parallel with the rod 40. The wire 34 extends slidably through the bore 42 and has fixed to the end thereof a collar 43. The arm 39 and the rod 40 are normally urged toward the idle position, as shown in Fig. 1, by the spring I39.
Referring to Figs. 1, 2 and 8, the numerals 44 and 45 indicate a pair of pressure switches, said switches communicating with a common T conduit 46 which is in communication with the discharge pressure of the oil pump and may be connected to the conduit I02 of the oil tank truck, as shown in Fig. 8. The pressure switch 44 has a pair of contacts 4! and 48 which are closed when the pressure in the conduits 46 and I02 exceeds a predetermined value, for example pounds. The contacts 41 and 48 are opened when the pressure in the conduits 46 and I02 falls below the predetermined pressure. The pressure switch 45 has a pair of contacts 49 and 50 which are opened by pressure in conduits 46 and I02 above a predetermined value which is preferably less than the pressure setting of the switch 44, for example 40 pounds, and are closed when the pressure in said conduits falls below said predetermined value. The pressure switches 44 and 45 are preferably adjustable so that the pressure of actuation may be varied to suit individual pump characteristics.
The numeral 5| indicates a manually operated single pole single throw switch preferably located in the cab of the truck 88. The numeral 52 indicates a. normally closed push button type switch which is. preferably located in; the hose.
compartment 53 in a position to. be actuated. by
the door 55 when said. door is closed. The con:- tacts of the switch 52 are opened when. the doorv 55 is in closed position, and the contacts; of
said switch are closed when the. door 55" isopened. This feature. prevents. operating of the improved controller except when the door 55 is open. The numeral 56 indicates: the battery of the truck 88.
The electric circuit of the improved controller will now be described. A wire 51 connects: the
contacts are and 49 with one side ofthe switch 5!. series and are connected to one side of the. battery 56. A. wire 58 connects the contacts ll. and 21, and a wire 59 connects the contacts 58' and 24. One wire 55 of the solenoid H is connected: to the contact 22, and onewire iii of the solenoid.
i2 is connected to the contact 25. The second wire 62 of the solenoid i I is connectedto the secnd wire 53 of the solenoid l2, and said wiresare connected by a wire 64 to the other side of the battery 56.
Operation When the truck is traveling toward a delivery I point, the switches and. 52 are both open and the parts of the device are disposed, as shown in Fig. 1, with the exception that the contacts of the switches 44, 5! and 52, are open and the contacts of the switch are closed. Upon reaching the delivery site, the manually operated.
switch 5i is closed by the operator and the power take off for operating the pump is engaged, the engine accelerator being und'epressed so that the engine idles and the rod 40 and lever 39. are positioned by the spring I39 as shown in Fig. 1.v
Upon opening the door of. the hose reel compartment 53, the switch 52 automatically closes. to complete the circuit to the battery 55 and.
render the controller operative. The operator then withdraws the hose 96 from the hose reel compartment 53, the nozzle valve 91 being normally shut off. During this time the engine 90 is driving the oil pump at a slow speed, and
even though the hose nozzle valve 91 is shut oif, the bypass valve of the pump 98 can accommodate all of the oil being pumped by the pump without vibration. However, the pressure in the hose 96, and consequently also the conduits t6 and ace, is above the predetermined pressure necessary to close the contacts. of the switch 44', and to open the contacts of the switch 45, as shown in Fig. 1.
At the instant the delivery nozzle valve is opened, the pressure in the hose and in the conduit 56 drops below the predetermined level of to pounds, thereby opening the contacts 'of the switch i t and closing the contacts of the switch Electrical current then flows through the switches 52, 5!, 45 and 23 and energizes the. solenoid 62 causing the plungers l4 and It, as well as the plate Hi, to be moved. toward the right, as viewed in Fig. 1, to the position of Fig, 2. As the plate :5 moves toward the right, the pin 29 is moved transversely by the slot IT. to. its position shown in Fig. 2. The slide. bar 28, of course, moves with the pin 29 and supports the same.
As the pin 29 so moves, it pulls with it the wire it, thereby causing the collar 43', fixed to the The switches 5i. and 5.2 are connected in.
opposite-endof theewire 34, toengage-the block tion. the engine is speeded up so that it drivestheoilpumpat a predetermined-speed: which is preferablyitsmaximum efficient pumping speed;
As the plungers [3' and Ill are moved toward the right, as. described, the contactsof the switch 2d return to their normally closed position and the contacts, of the switch 23 are opened by the- Opening of theplunger 44,, as. shown in Fig; 2. contacts-of the-switch 23 shuts off the current to the solenoid: l2, thereby deenergizing the same and preventing it from heating up and from drawing further electricity.
When the hose nozzle valve 91 is closed; shutting off the flow of, oil through the dischargehose, apressure beyond 50.pounds quickly builds up-within the hose and the conduits 45 and I02. This'causes the contacts of the switch M to close and the contacts of the switch 55 to open, therebypermitting current to flow from the battery 56 throughitheswitches 52, 51, it and 23 to energize the solenoid lil. The-energized solenoid i 5 moves the plunger it to the left, pulling with it the plate l5 and the plunger id, to the position of Fig; 1. As'the plate l5is moved. toward the left, the slot l1. moves the pin 29 transversely to its position shown in Fig. 1', thereby moving with it the wire t' iand moving the collar 63 on the opposite end of said wire to. the right, as viewed in Figs. 1' and 2, to permit the block 41, the rodv MI and the arm 39 to return totheir positions-of Fig. 1 under the urging of the spring I39. This immediately slows the engine 90 andthepumpSB to idling speed. As shown in Fig. 1, the contacts of the switch 20 areopened when the plunger i3 is moved toward: the left to idling position. This deenergizes the solenoid ll, preventing it from heating upand from drawing any further current.
While the slot ll in the-plate i5 is operative to cause transverse movement of the pin 29 in responseto longitudinal movement of said plate, the end portions 18 of said slot, being disposed at substantially a right angle to the path of movementof the pin 29, prevent transverse movement of the pin 29' While said pin is positioned in said end portions. The pin 29 is, therefore, lockedin position whenever it is disposed in an end portion [f theslot l'i'. Transmission from the block Gil to the wire 35' of any force acting to the left, as viewed in Figs. 1 and 2, is prevented by the slidable engagement of the wire 34 in the bore 42. of saidblock.
I-t isthus apparent that the speed of the engine Siland of the oil pump 98 is instantly adjusted by the improved controller in response to pressure changes on. the discharge side of. the pump 9.8 resulting from opening or closing of. the delivery nozzle valve 97. As a result, the oil pump 98- at all times runs without any of the objectionable vibration which normally occurs when said pump is run at pumping speed. with the discharge nozzle closed. The elimination of this vibration greatly reduces leakage at the fit gallonage per minute permitted by the improved controller, a substantial amount of the operator's time is saved, due to the fact that no manual throttle adjustments need be made by the operator from the time he leaves the cab of the truck on arrival at the delivery site until he returns to the cab on completion of the delivery. It is apparent, therefore, that the improved controller provides a double time saving feature.
A modified form of the invention, which is adapted for use on larger trucks, is shown in Figs. and 6. The numeral It indicates an L-shaped base upon which is mounted a pair of solenoids I I and I 2 disposed in spaced relation at substantially a right angle with respect to each other. A normally closed switch is mounted adjacent one end of the solenoid II in a position to be actuated by the plunger I3 of said solenoid. A normally closed switch 23 is mounted adjacent an end of the solenoid I2 in a position to be actuated by the plunger I4 of said solenoid. A pair of pressure switches 44 and 45, preferably identical with the pressure switches 44 and 45 of the preferred form of the invention, are connected to a common T conduit 46 which may communicate with the conduit I02 of the truck 88. The switches 5| and 52 are identical with the switches 5| and 52 of the preferred form of the invention. The wiring diagram of the modified form of the invention is preferably identical with that of the preferred form, and the electric conductors indicated by primed numerals in Figs. 5 and 6 are identical with those indicated by the same numbers unprimed in Figs. 1 and 2.
Fixed to the base IB and spaced from the adjacent ends of the solenoids II and I 2 is a bracket ID on which is pivotally mounted, for movement in a plane parallel with the base IE3, a pawl or detent "II The pawl 'II is formed along one edge SI, at the end thereof adjacent the solenoid I2, with a notched out portion I2 forming a shoulder 13. At its opposite end the pawl TI is formed with an apertured ear 14. The ear F4 is connected to an ear I5 on the solenoid II by a coiled tension spring 16 which normally urges the pawl II in a clockwise direction about its pivot H. The plunger I3 of the solenoid II is linked to the end portion of the pawl II adjacent the notch 12 by means of a link 18.
A second bracket I9 is mounted on the base Ill, and pivotally mounted on the bracket I9 for movement coplaner with the pawl II is a lever 89. The lever 83 is positioned so that one end thereof is engageable with the edge SI of the pawl II. This end of the lever 80 is linked to the adjacent end of the plunger I4 of the solenoid I2 by means of a link 82. A coil tension spring 83 connects the opposite end portion of the lever 80 with an ear 64 on the solenoid l2 and normally urges the lever 80 in a counter-clockwise direction about its pivot 85. Counter-clockwise movement of the lever 80 is limited by a set screw 86 extending through a block 81 carried by the bracket Hi.
The end of the lever 80 adjacent the spring 83 is pivotally connected to a throttle rod 34' which slidably extends through a bore 42 in a block 4| in the same manner that the wire 34 extends through the bore 42 in the block M in the preferred form of the invention. The rod 34' has fixed thereto a collar 43, and movement is transmitted from the rod 34 to the accelerator rod 48' and the throttle arm 39 in the same manner that movement is transmitted from the wire 34 to the arm 39 in the preferred form.
Fig. 5 shows the parts of the modified form of the invention disposed in idle position. At the instant the delivery nozzle valve is opened, the pressure in the conduit I02 and in the delivery hose 96 drops below 40 pounds, causing the switch 44 to open and the switch 45 to close. Current then flows from the battery 56 through the switches 52, 5|, 45' and 23 to energize the solenoid I2, which in turn pulls the plunger I4 to the right to the position thereof shown in Fig. 6. This movement of the plunger I4 pivots the lever in a counter-clockwise direction against the tension of the spring 83 and moves the throttle rod 34 to the left thereby causing the throttle arm 39 to be swung to the left to pumping position shown in Fig. 2. The truck engine is thereby speeded up to pumping speed. As the lever 80 moves in the clockwise direction, the pawl II is pivoted in a clockwise direction by the tension spring 76 to thereby move the shoulder 73 and the notch I2 into engagement with the end of the lever 80, as shown in Fig. 6, thereby locking said lever in this position. Simultaneously with the pivoting of the pawl H, the plunger I3 of the solenoid I I is moved toward said pawl and away from the switch 26', permitting the contacts of said switch to close. As the plunger 54 of the solenoid I2 is moved to the right by the energization of said solenoid, said plunger opens the contacts of the switch 23, thereby deenergizing the solenoid I2 to prevent it from heating up and from drawing further electricity.
When the delivery nozzle valve is closed, the pressure in the hose and in the conduits 46 and I02 builds up beyond 50 pounds, to thereby cause the switch 44 to close and the switch 45 to open. This energizes the solenoid I I by causing current to flow from the battery 56 through the switches 52, 5|, 44 and 20. Energization of the solenoid I I causes the plunger I3 thereof to be retracted and to rotate the pawl II in a counter-clockwise direction against the tension of the spring I6. This rotation of the pawl TI releases the lever 80 which, under the urging of the tension spring 83, snaps back to the position thereof shown in Fig. 5 in engagement with the edge 8| of the pawl I I. As the lever 80 is so pivoted, the plunger I4 is moved therewith to permit the contacts or" the switch 23 to close. Retraction of the plunger I3 opens the contacts of the switch 20, as shown, and deenergizes the solenoid II to thereby pre vent it from heating up and from drawing further current. As the lever 80 pivots in a counterclockwise direction, the accelerator rod 40 and the throttle arm 39' are permitted to return to idle position under the urging of the spring I39. This slows down the engine 90 and the pump 98 to idling speed, and the parts of the improved controller will remain as shown in Fig. 1 until the discharge nozzle 91 is again opened, at which time the improved controller will again automatically speed up the truck engine 99 and the pump 98 to pumping speed.
Various changes and modifications may be made without departing from the spirit of the invention, and all of such changes are contemplated as may come within the scope of the claims.
What I claim is:
1. In combination: a fluid pump having a discharge line provided with a normally closed shutoff valve, said discharge line normally containing fluid under pressure when said pump is opcrating; a motor drivingly connected to said pump and having a speedcontrol lever normally in idling position, said lever being movable between idling and pumping positions; a source of electrical current; a solenoid connected to said speed control lever in a manner to move said lever to pumping position when said solenoid is energized; a first .pressure switch connected to said source of current and to said solenoid and responsive toa predetermined pressure in said discharge line to cause energization of said solenoid and movement .of the speed control lever to pumping position; mechanism actuated by a second solenoid connected to said source of current for moving said speed control lever to idling position when said second solenoid is energized; and a second pressure switch responsive to a predetermined higher pressure in said discharge line to cause energization of said second solenoid and movement of the speed control lever .to idling position.
.2. In combination: a fluid.pumphavingadis chargeline provided with alnormally closedshutofi valve, said discharge line normally containing fluid under pressure when said pump is operating; a motor drivingly connected to saidpump and having a speed control lever normally in idling position, said lever being movable between idling and pumping positions; a source-of electrical current; a solenoid connected to said speed control lever in a manner to move said lever to pumping position when said solenoid is energized; a first pressure switch connected to said source of current and to said solenoid and responsiveto a predetermined pressure in said discharge line to cause energization of said solenoid and movement of the speed control leverto pumping position; mechanism actuated by a second solenoid connected to said source of current for moving said speed control lever to idling position when said second solenoid is energized; a second pressure switch .responsive to a predetermined higher pressure in said discharge line to cause energization of said second solenoidand movement of the speed control .leverlto idling position; a third switch responsive to movement of the control lever to pumping position for stopping the flow-of current to the first solenoid; and a fourth switch responsive to movement of the control lever to idling position for stopping the flow of current to the second solenoid.
3. In combination: a fluid pump having a discharge lineprovided with a normally closed shutoff valve, saiddisc'harge line normally containing fluid under pressure when said pump is operat ing; a motor drivingly connected to said pump and having a speed control lever normally in idling position, said lever being movable'between idling and pumping positions; a source of electrical current; a solenoid connected to saidspeed control lever in a manner to move said lever to pumping position when said solenoid is energized; a first pressure switch connected 'to said source of current and to said solenoid and responsive to a predetermined pressure in said discharge line to cause energization of said solenoid and movement of the speed control lever to pumping position; mechanism actuated by'a second solenoid connected to said source of current for moving said speed control lever to idling position when said second solenoid is-energized; a second pressure switch responsive to-a predetermined higher pressure in said discharge line tocause energization of said second solenoid and movement of the speed control lever to idling position; a third switch responsive to movement of the control lever to pumping position for stopping the flow of current to the first solenoid; a fourth switch responsive to movement of the control lever to idling position for stopping the flow or" current to the second solenoid; and releasable means for holding said speed control lever in pumping position after said first solenoid i deenergized.
4. In combination: a fluid pump having a discharge line provided with a normally closed shutoif valve, said discharge line normally contain- :ing 'iluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control member movable between idling pumping positions, said member being normally in idling position; a source of electric current; a first electric power means connected to said speed control member in a manner to move the latter to pumping position when said power means is energized; a second electric power means; mechanism including said second electric power means for moving said speed control member to idling position when said second power means is energized; and pressure responsive switch :mean connected to said source and'to said first and second electric power means for providing alternative electrical con- .nection of said source with either said first or second power means, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first power means to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to a predetermined higher pressure in the discharge line to alternatively connect said source with the second power means to energize said second power :means and move the speed control member to idling position.
5. In combination: a fluid pump having a discharge line provided with a normally closed shutoii' valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control member movable between idling and pumping positions, said member being normally in idling position; a source of electric current; .a first solenoid connected to said speed controlmember in a manner to move the latter to pumping position when said solenoid is energized; a second solenoid; mechanism including said second solenoid for moving said speed control member to idling position when said second solenoid is energized; and pressure responsive switch means connected to said source and to said first and second solenoids for providing alternative electrical connection of said source with either said first or second solenoids, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first solenoid to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to .a predetermined higher pressure in the discharge line to alternatively connect said source with the second solenoid to energize said second solenoid and move the speed control member to idling position.
6. In combination: a fluid pump having a discharge line provided with a normally closed shutoff valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control member movable between idling and pumping positions, said member being normally in idling position; a source of electric current; a first electric power means connected to said speed control member in a manner to move the latter to pumping position when said power means is energized; a second electric power means; mechanism including said second electric power means for moving said speed control member to idling position when said second power means is energized; pressure responsive switch means connected to said source and to said first and second electric power means for providing alternative electrical connection of said source with either said first or second power means, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first power means to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to a predetermined higher pressure in the discharge line to connect said source with the second power means to energize said second power means and move the speed control member to idling position; a switch responsive to movement of the control member to pumping position for stopping the flow of current to the first electric power means; and a second switch responsive to movement of the control member to idling position for stopping the flow of current to the second electric power means.
'7. In combination: a fluid pump having a discharge line provided with a normally closed shutoff valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control membermovable between idling and pumping positions, said member being normally in idling position; a source of electric current; a first solenoid connected to said speed control member in a manner to move the latter to pumping position when said solenoid is energized; a second said second solenoid for moving said speed control member to idling position when said second solenoid is energized; pressure responsive switch means connected to said source and to said first and second solenoids for providing alternative electrical connection of said source with either said first or second solenoids, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first solenoid to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to a predetermined higher pressure in the discharge line to alternatively connect said source with the second solenoid to energize said second solenoid and move the speed control member to idling position; a switch responsive to movement of the control member to pumping position for stopping the flow of current to the first solenoid; and a second switch responsive to movement of the control member to idling position for stopping the flow of current to the second solenoid.
8. In combination: a fluid pump having a discharge line provided with a normally closed shutoff valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control member movable between idling and pumping positions, said member being normally in idling position; a source of electric current; a first solenoid connected to said speed control member in a manner to move the latter to pumping position when said solenoid is energized; a second solenoid connected to said speed solenoid; mechanism including control member in a manner to move the latter to idling position when said second solenoid is energized; and pressure responsive switch means connected to said source and to said first and second solenoids for providing alternative electrical connection of said source with either said first or second solenoids, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first solenoid to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to a predetermined higher pressure in the discharge line to alternatively connect said source with the second solenoid to energize said second solenoid and move the speed control member to idling position.
9. In combination: a fluid pump having a discharge line provided with a normally closed shutoff Valve, said discharge line normally containing fluid under pressure when said pLunp is operated; a motor drivingly connected to said pump and having a speed control member movable between idling and pumping positions, said member being normally in idling position; a movable cam; a cam follower connected to said speed control member in a manner to move the latter between idling and running positions in response to movement of said cam; a first solenoid connected to said cam in a manner to move the latter in a direction to cause movement of the speed control member toward pumping position upon energizetion of said solenoid; a second solenoid connected to said cam in a manner to move the latter in a direction to cause movement of the speed control member toward idling position upon energization of said second solenoid; a source of electric current; and pressure responsive switch means connected to said source and to said first and second solenoids for providing alternative electrical connection of said source with either said first or second solenoid, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first solenoid to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to a predetermined higher pressure in the discharge line to alternatively connect said source with the second solenoid to energize said second solenoid and move the speed control member to idling position.
10. In combination: a fluid pump having a discharge line provided with a normally closed shutoff valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control member movable between idling and pumping positions, said member being normally in idling position; a movable cam plate formed with a diagonally extending cam slot; a cam follower positioned in said slot and movable transversely in response to longitudinal movement of said plate, said follower being connected to said speed control member in a manner to move the latter between idling and running positions in response to longitudinal movement of said cam plate; a first solenoid connected to said cam in a manner to move the latter in one longitudinal direction to cause movement of the speed control member toward pumping position upon energization of said solenoid; a second solenoid connected to said cam in a manner to move the latter in the opposite longitudinal direction to cause movement of the speed control member toward idling position upon energization of said second solenoid; a source of electric current; and pressure responsive switch means connected to said source and to said first and second solenoids for providing alternative electrical connection of said source with either said first or second solenoid, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first solenoid to energize the latter and move the speed control memher to pumping position, and said switch means formed with a cam slot having substantially parallel longitudinally extending end portions and a diagonal intermediate portion; a cam follower positioned in said slot and movable transversely in response to longitudinal movement of said plate, said follower being connected to said speed control member in a manner to move the latter between idling and running positions in response to longitudinal movement of said cam plate, the longitudinally extending end portions of said cam plate slot preventing transverse movement of said follower when said follower is positioned in either of said end portions; a first solenoid connected to said cam in a manner to move the latter in one longitudinal direction to cause movement of the speed contro1 member toward pumping position upon energization of said solenoid; a second solenoid connected to said cam in a manner to move the latter in the opposite longitudinal direction to cause movement of the speed control member toward idling position upon energization of said second solenoid; a source of electric current; and pressure responsive switch means connected to said source and to said first and second solenoids for providing alternative electrical connection of said source with either said first or second solenoids, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first solenoid to energize the latter and move the speed control mernher to pumping position, and said switch means also being responsive to a predetermined higher pressure in the discharge line to alternatively connect said source with the second solenoid to energize said second solenoid and move the speed control member to idling position.
12. In combination: a fluid pump having a discharge line provided with a normally closed shutoff valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control member movable between idling and pumping positions, said member being normally in idling position; a lever connected to said speed control member and movable therewith between idling and pumping positions; a source of electric current; a first solenoid connected to said lever in a manner to move the latter to pumping position upon energization of said solenoid; movable detent means engageable with Iii said lever upo'n movement of said lever to pumping position to hold said lever and hence the speed control member, in pumping position; a second solenoid connected to said detent means in a manner to release said detent means and permit movement of said lever and speed control member to idling position upon energization of said second solenoid; and pressure responsive switch means connected to said source and to said first and second solenoids for providing alternative electrical connection of said source with either said first or second solenoids, said switch means being responsive to a predetermined pressure in the discharge line to connect the source with the first solenoid to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to a predetermined higher pressure in the discharge line to alternatively connect said source with the second solenoid to energize said second solenoid and permit movement of the lever and speed control member to idling position.
13. In combination: a fluid pump having a discharge line provided with a normally closed shutoff valve, said discharge line normally containing fluid under pressure when said pump is operated; 3, motor drivingl connected to said pump and having a speed control member movable between idling pumping positions, said member being normally in idling position; a lever connected to said control member and movable therewith between g and pumping positions and being spring u ged toward idling position; a source of electric current; a first solenoid connee ed to said lever in a manner to move the latter to pumping position upon energization of solenoid; a spring loaded detent mounted for engagement with said lever upon movement of said lever to pumping position to hold said lever, and hence the speed control member, in pumping position; a second solenoid connected to said detent in a manner to release said detent and permit movement of said lever and speed control member to idling position upon energization of said second solenoid; and pressure responsive switch means connected to said source and to said first and second solenoids for providing alternative electrical connection of said source with either said first or second solenoids, said switch means being responsive to a predetermined pressure in the discharge line to connect the source "ith the first solenoid to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to a predetermined higher pressure in the discharge line to alternatively connect said source with the second solenoid to energize said second solenoid and permit movement of the lever and speed control member to idling position.
14. In combination: a fluid pump having a discharge line provided with a normally closed shutofi valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a speed control member movable between idling and pumping positions, said member being normally in idling position; a source of electric current; a first electric power means connected to said speed control member in a manner to move the latter to pumping position when said power means is energized; a second electric power means; mechanism including said second electric power means for moving said speed control memher to idling position when said second power means is energized; pressure responsive switch means connected to said source and to said first and second electric power means for providing alternative electrical connection of said source,
with either said first or second power means, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first power means to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to a predetermined higher pressure in the discharge line to alternatively connect said source with the second power means to energize said second power means and move the speed control member to idling position; and a normally closed shut-off switch in the line between said source and said pressure responsive switch means for preventing the flow of current to said switch means and to said first and second power means when said switch is opened.
15. In combination: a fluid pump having a discharge line provided with a normally closed shutoiT valve, said discharge line normally containing fluid under pressure when said pump is operated; a motor drivingly connected to said pump and having a. speed control member movable between idling and pumping positions, said member being normally in idling position; a source of electric current; a first electric power means connected to said speed control member in a manner to move the latter to pumping position when said power means is energized; a second electric power means; mechanism including said second electric power means for moving said speed control mem- 16 her to idling position when said second power means is energized; pressure responsive switch means connected to said source and to said first and second electric power means'for providing alternative electrical connection of said source with either said first or second power means, said switch means being responsive to a predetermined pressure in the discharge line to connect said source with the first power means to energize the latter and move the speed control member to pumping position, and said switch means also being responsive to a predetermined higher pressure in the discharge line to alternatively connect said source with the second power means to energize said second power means and move the speed control member to idling position; and a dooroperated normally closed shut-off switch in the line between said source and said pressure respon sive switch means for preventing the flow of current to said switch means and to said first and second power means when said switch is opened.
DONALD R. NAHMENS.
References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 725,386 Whitney Apr. 14, 1903 947,43? Ellis Jan. 25, 1910 2,099,001 Peterson July 23, 1935 2,023,418 Gustafson Dec. 10, 1935 2,224,295 Hofer Dec. 10, 1940 2,373,143 Samiran Apr. 10, 1945
US180132A 1950-08-18 1950-08-18 Pump motor controller Expired - Lifetime US2651996A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2900915A (en) * 1955-03-25 1959-08-25 Scully Signal Co Automatic engine cut-off for pump-equipped tank truck vehicles
US3041046A (en) * 1958-12-12 1962-06-26 Cherry Burrell Corp Heat transfer apparatus
US3111903A (en) * 1962-06-19 1963-11-26 Carl R Waterman Fluid delivery system
US3894811A (en) * 1973-12-10 1975-07-15 Lester L Bergey Pump motor control
US20080014096A1 (en) * 2006-07-17 2008-01-17 Gilpatrick Richard J Idle down control for a pressure washer
US20090317262A1 (en) * 2006-07-17 2009-12-24 Briggs & Stratton Corporation Engine speed control for pressure washer
US20100282862A1 (en) * 2009-05-06 2010-11-11 Briggs & Stratton Corporation Pressure washer with throttle control
US20110142685A1 (en) * 2009-12-16 2011-06-16 Briggs & Strantton Corporation Pump unloader valve and engine throttle system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US725386A (en) * 1902-07-29 1903-04-14 Frank E Whitney Bellows-motor controller.
US947437A (en) * 1908-11-17 1910-01-25 Thomas William Ellis Starting and stopping device for gas and other engines.
US2023418A (en) * 1930-07-01 1935-12-10 Schramm Inc Control for internal combustion engines
US2099001A (en) * 1935-04-12 1937-11-16 George T Downs Multiple-jacquard motion
US2224295A (en) * 1939-10-03 1940-12-10 David L Hofer Suction dredge pump control system
US2373143A (en) * 1943-07-13 1945-04-10 Samiran David Automatically controlled portable fuel pumping unit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US725386A (en) * 1902-07-29 1903-04-14 Frank E Whitney Bellows-motor controller.
US947437A (en) * 1908-11-17 1910-01-25 Thomas William Ellis Starting and stopping device for gas and other engines.
US2023418A (en) * 1930-07-01 1935-12-10 Schramm Inc Control for internal combustion engines
US2099001A (en) * 1935-04-12 1937-11-16 George T Downs Multiple-jacquard motion
US2224295A (en) * 1939-10-03 1940-12-10 David L Hofer Suction dredge pump control system
US2373143A (en) * 1943-07-13 1945-04-10 Samiran David Automatically controlled portable fuel pumping unit

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2900915A (en) * 1955-03-25 1959-08-25 Scully Signal Co Automatic engine cut-off for pump-equipped tank truck vehicles
US3041046A (en) * 1958-12-12 1962-06-26 Cherry Burrell Corp Heat transfer apparatus
US3111903A (en) * 1962-06-19 1963-11-26 Carl R Waterman Fluid delivery system
US3894811A (en) * 1973-12-10 1975-07-15 Lester L Bergey Pump motor control
US20080014096A1 (en) * 2006-07-17 2008-01-17 Gilpatrick Richard J Idle down control for a pressure washer
US20090317262A1 (en) * 2006-07-17 2009-12-24 Briggs & Stratton Corporation Engine speed control for pressure washer
US8038413B2 (en) 2006-07-17 2011-10-18 Briggs And Stratton Corporation Idle down control for a pressure washer
US20100282862A1 (en) * 2009-05-06 2010-11-11 Briggs & Stratton Corporation Pressure washer with throttle control
US20110142685A1 (en) * 2009-12-16 2011-06-16 Briggs & Strantton Corporation Pump unloader valve and engine throttle system

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