US3823647A - Electromagnetic bucket positioner for heavy equipment vehicles and the like - Google Patents

Electromagnetic bucket positioner for heavy equipment vehicles and the like Download PDF

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Publication number
US3823647A
US3823647A US00284491A US28449172A US3823647A US 3823647 A US3823647 A US 3823647A US 00284491 A US00284491 A US 00284491A US 28449172 A US28449172 A US 28449172A US 3823647 A US3823647 A US 3823647A
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United States
Prior art keywords
normally
electromagnet
control valve
open
switch means
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00284491A
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English (en)
Inventor
T Campbell
J Russey
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Caterpillar Inc
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Caterpillar Tractor Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Priority to US00284491A priority Critical patent/US3823647A/en
Priority to CA177,398A priority patent/CA996664A/en
Priority to BE134882A priority patent/BE803958A/xx
Priority to FR7331102A priority patent/FR2198031B1/fr
Priority to JP48096264A priority patent/JPS4958601A/ja
Priority to GB4072173A priority patent/GB1399789A/en
Priority to DE2344113A priority patent/DE2344113C2/de
Application granted granted Critical
Publication of US3823647A publication Critical patent/US3823647A/en
Assigned to CATERPILLAR INC., A CORP. OF DE. reassignment CATERPILLAR INC., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CATERPILLAR TRACTOR CO., A CORP. OF CALIF.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G9/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously
    • G05G9/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only
    • G05G9/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
    • G05G9/047—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/2004—Control mechanisms, e.g. control levers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G5/00—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member
    • G05G5/06—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member for holding members in one or a limited number of definite positions only
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G9/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously
    • G05G9/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only
    • G05G9/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
    • G05G9/047—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks
    • G05G2009/04703—Mounting of controlling member
    • G05G2009/04714—Mounting of controlling member with orthogonal axes
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G2700/00—Control mechanisms or elements therefor applying a mechanical movement
    • G05G2700/04—Control mechanisms limiting amplitude or adjusting datum position
    • G05G2700/08—Control mechanisms for locking members in one or more positions

Definitions

  • An electromagnetic bucket positioner includes an electromagnet disposed to selectively latch, when energized, a controlvalve of a bucket positioning system.
  • a normally-open switch is included in the system, and is adapted for closure via selected movement of a manually operable control lever, thereby energizing the electromagnet to latch the control lever in the select position.
  • a normally-closed switch is disposed in series with the normally-open switch, and is adapted to be opened upon selected translation of the cylinder rod of the associated hydraulic cylinder, to thus interrupt current flow to the electromagnet, to de-energize sameand release the control lever.
  • the control valve returns to a neutral position, stopping the flow of hydraulic fluid to the respective cylinder, to stop further movement, tilt, etc., of the vehicle bucket.
  • An electronic relay circuit may be included to introduce current to the electromagnet when energized via closure of the switches, In the latter embodiment, the relay circuit is de-energized after the electrical circuit is interrupted by opening the respective normally-closed switch.
  • the invention relates to a component positioner for heavy equipment vehicles and the like, which automatically positions a bucket, blade, etc., of the vehicle.
  • Hydraulic positioning control systems suffer from bucket control problems when malfunctions occur in the hydraulic system. For example, a leak in the slave cylinder or the hydraulic circuit can cause bucket drifting whichranges from slight movement to a drifting which simulates a slow dump. A broken supply line almost completely incapacitates the positioning control system. External repairs are time-consuming, particularly if the line to the tank has to be replaced. If an internal repair or adjustment has to be made, it is necessary to drain the hydraulic tank, thus resulting in excessive down-time. A
  • Electrical positioning control systems overcome most of the inherent problems of the above-identified hydraulic systems, in that they are more reliable, more readily serviced, and are external and thus independent of the main hydraulic apparatus.
  • most electrical positioning systems utilize microswitches mechanically coupled for actuation to cams, recessed rods, etc., which in turn, are attached to the tilt positioning hydraulic cylinder to thus indicate the position of the bucket or vehicle component.
  • the combi- I nation is subject to wear, dirt, vibration, etc., common to earh-moving apparatus, with the associated maintenance and break-down problems.
  • a detent mechanism as an integral part of the control valve, which includes a springloaded latching system to retain the control valve in a preselected position. Release of the control valve is effected via a solenoid, which acts against the springs to release the latch mechanism and thus the control valve.
  • a solenoid acts against the springs to release the latch mechanism and thus the control valve.
  • the invention provides an improved electromagnetic position control system for controlling the tilt, position, orientation, etc., of a selected component on a heavy equipment vehicle.
  • a hydraulic cylinder is coupled via an associated cylinder rod to a bucket or vehicle component.
  • An electromagnet is disposed to latch a control valve in a selected operating position when the control valve is moved byv the operator by means of a control lever.
  • a first normally-open switch is disposed for closure when the lever is moved to the selected position and is serially coupled to a second normally-closed switch disposed on the hydraulic cylinder. The switches are actuated by application thereto of a magnetic field. Means for generating the respective magnetic fields are secured to the control lever, and
  • the operator moves the lever to the selected (rack-back) position, which causes energization of the electromagnet via closure of the first normally-open switch by the magnetic field secured to the lever.
  • the second switch is opened to interruptthe current to the electromagnet, whereupon the control lever is released to allow the control valve to seek its neutral position. Since fluid is no longer delivered to the hydraulic cylinder, thebucket stops in the selected'position ready for the next load cycle.
  • FIG. I is a perspective depicting one embodiment of the invention combination for positioning a vehicle component.
  • a bucket positioner system in accordance with the invention combination, for automatically positioning a bucket of a loader vehicle so that it is level when lowered to the ground to allow loading the bucket.
  • a single control lever 10 is adapted for movement fore and aft, as well as from side-to-side, to thus provide manually operable means for controlling both a bucket lift control valve 12 and a bucket tilt control valve 14.
  • a fore and aft movement of the control handle 10 causes a lever 16 to pivot about a first axis 18, causing pivoting of an arm 19 secured to the lever 16, which in turn raises or lowers a control element 20 to actuate the lift control valve 12.
  • Control valve 12 selecpled to a lever 28 and pivots the latter about a third axis 30 to thus raise or lower a control element 32 of the tilt control valve 14.
  • a ferrous bar 34 and a permanent magnet 36 are attached to the pivotable end of the lever 28.
  • the bucket positioner of the invention includes an electrical circuit that acts as a detent for holding the tilt cylinder control valve 14 in the rack-back position until the bucket is level with the ground.
  • the circuit utilizes two switches 38, 40, which are actuated by applying a magnetic field thereto.
  • the switch 38 is normallyclosed and the switch 40 is normally-open, with both switches being placed in series with an electromagnet 42.
  • a battery 44 is coupled from the switch- 38 to ground and serves as an energy source for energization of the electromagnet 42 when both switches 38, 40 are closed.
  • the normally-open switch 40 is secured in the region of the control valve and lever l4, 10, to allow the ferrous bar 34 to pivot against the electromagnet 42 when the lever is moved to the rack-back position.
  • the normally-closed switch 38 is attached to a tilt cylinder 46 of the loader vehicle, adjacent the rear end of a tube 48, axially secured along the cylinder 46.
  • a rod 50 has a first end slidably disposed in the tube 48 and a second end thereof integrally secured to the tilt cylinder rod 52.
  • the first end of rod 50 has a small permanent magnet 54 disposed thereon for triggering the switch 38.
  • tube 48 and rod 50 also combine to form a visual bucket position indicator by which the operator may visually level the bucket if desired.
  • automatic positioning of the bucket is preferable to allow the operator to divert his attention to other activity, such as backing-up, in order to save time during the loading cycle.
  • the operator desires to level the bucket when it is lowered to the ground so that it will be in the proper position to begin the next workcycle.
  • the operator moves the control handle 10 to the rack-back position, which actuates the control valve 14, causing the tilt cylinder 46 to retract.
  • Movement of control handlev 10 to the rack-back position causes the lever 28 to pivot about axis 30, whereby permanent magnet 36 is brought into close proximity of and applies a magnetic field to the switch 40.
  • Electromagnet 42 in turn holds the lever 28 and thus lever 10 in the rackback position by means of the magnetic attraction bebucket is stopped in the selected level position, ready for the next load c'ycle.
  • FIGS. 2-4 there is shown an alternative, more sophisticated, embodiment of the invention, including a bucket tilt and lift positioning system, having a solid state relay circuit and a mechanical control lever linkage mechanism, which inpart cooperates with the electronic circuit to provide the invention combination. Note that similar elements in the embodiment of FIG; 1 and that of FIGS. 2-4 are designated by the same numerals.
  • the single control lever 10 is adapted for fore-and-aft, as well as side-to-side movement.
  • Lever 10 is operably connected during fore-and-aft movement, via a lift mechanical linkage mechanism 56 'to the lift control valve 12', and during side-toside movement via a tilt mechanical linkage mechanism 58 to the tilt control valve 14.
  • the lift linkage mechanism 56 includes a bell crank 60, whichisprovided with an additional arm 62, and which controls the lift operation of the vehicle bucket, via the lift control valve 12 and tween the electromagnet 42 and the ferrous bar 34.
  • the operator may move the control valve 14 from the rack-back position by manually overriding the force of the electromagnet 42.
  • the arm 62 is provided with an angled flat surface 66 at its pivotable end.
  • the bell crank 60 is coupled to the lift control element 20 via an adjustable rod 67.
  • the tilt linkage mechanism 58 includes a bell crank 68, which is also provided with an additional arm 70, and which controls the tilt: operation of the vehicle bucket, etc., via the tilt control valve 14 and the tilt hydraulic cylinder 46 (of for example FIG. 1).
  • Arm 70 as best seen in FIG. 4, is also provided with an angled flat surface 72 at its pivotable end.
  • The'bell crank 68 is coupled to the tilt control element 32 via an adjustwith a pair of angled flat surfaces 80, 82.
  • the flat surfaces 80, 82 are oriented for confronting contact against the flat'surfaces 66 and 72 of arms 62 and respectively, upon pivotal rotation of the arms toward the core 78.
  • the electromagnet 42 is energized via the electronic circuit shown in schematic in FIG. 2.
  • the circuit includes the battery 44 of FIG. 1, a disconnect switch 84, and a fuse 86, serially connected from ground to a solid state relay 88.
  • Relay 88 includes a PNP transistor 90, which, when turned on', supplies a positive bias to the base electrode of an NPN transistor 92.
  • Transistor 90 is triggered upon application of a negative bias to the base electrode thereof, through completion of a circuit to ground through either of a pair of conductors 94 or 96 connected via a blade terminal 98.
  • a conductor 100 couples the transistor 92 to the electromagnet 42 via a blade terminal 102.
  • the conductors 94 serially connect a first normallyopen proximity switch 104 and a first normally-closed proximity switch 106.
  • the conductors 96 serially connect a second normally-open proximity switch 108 and pairs of switches, provide two parallel circuits to ground corresponding to respective lift and tilt positioning systems, for triggering the transistor 90 via application of the negative bias thereto, as previously discussed.
  • the circuit further includes permanent magnets for triggering the proximity switches 104-110.
  • a first permanent magnet 112 is attached to the bell crank 60 for pivotal movement therewith.
  • the proximity switch 104 is secured on the support 76 in a preselected position, whereby it is aligned with the magnet 112 when the surface 66 of the arm 62 contacts the surface 80 of the core 78 of electromagnet 42.
  • a second permanent magnet 114 is secured for pivotal movement with a lift arm 116 coupled to the lift hydraulic cylinder 64.
  • the normally-closed switch 106 is secured to a lift tower 118 of the vehicle in a selected position whereby it is aligned with the magnet 114 when the lift arm 116 raises the bucket to a predetermined height.
  • a third permanent magnet 120 is securedto the tilt linkage mechanism 58, as on one of the arms of the bell crank 68, for pivotal movement therewith.
  • the normally-open switch 108 is secured to the support 76 in a preselected position whereby it is aligned with the magnet 120 when the surface 72 of arm 70 contacts the surface 82 of core 78 of the electromagnet 42.
  • Fourth and fifth permanent magnets 122 and 124 are secured to an indicator rod 50 coupled to the cylinder rod 52 of the hydraulic cylinder 46. The positions of the magnets 122, 124 on indicator rod 50 are indicative of the position of thecylinder rod 52 and thus of the tilt of the bucket (not shown) to which cylinder rod 52 is coupled.
  • the normally-closed switch ll0 is secured to the tilt cylinder 46 in preselected position, whereby it is in register with the magnet 122 when the bucket is in a level orientation with respect to the ground.
  • the magnet 124 is spaced a predetermined distance from magnet l22 on the indicator rod 50, whereby it is in register with the switch 110 when the bucket is in the full rackback orientation.
  • fluid pressure is applied to the control valves 12, 14 via the hydraulic fluid pump and tank 22, as depicted in FIG..1.
  • the lift control valve 12 directs hydraulic fluid via conduits 126, 128 to the reciprocatable lift hydraulic cylinder 64, which in turn is pivotally coupled via its cylinder rod to the lift arm 116 for raising and lowering the vehicle bucket (not shown).
  • the tilt control valve 14 directs hydraulic fluid via conduits 130, 132 to the reciprocatable tilt hydraulic cylinder 46, which is pivotally connected via its cylinder rod 52 to linkage (not shown) for pivotally adjusting the tilt orientation of the vehicle bucket.
  • FIGS. 2-4 The operation of the bucket tilt and lift systemof FIGS. 2-4 is similar to that of the tilt system described with reference to FIG. 1.
  • the tilt hydraulic cylinder is substantially extended and the magnetl22 is in a position away from, and to the right of, the normally-closed switch 110.
  • Movement of the control lever to the rack-back position until the arm 70 contacts the electromagnet 42 actuates the tilt control valve 14 to retract the rod 52 of the hydraulic cylinder 46.
  • the arm 70 contacts the electromagnet 42 the latter is energized via completion of the respective circuit, by the simultaneous closure of the switch 108 via the magnet 120.
  • tilt control valve 14 Since tilt control valve 14 is now held in a detent position, cylinder 46 will continue to retract until the magnet 122 moves adjacent to the switch 110. Thereupon, switch 110 opens to de-energize the electromagnet 42, which releases the arm 70. This allows the tilt control valve 14 to return to its neutral or hold position, thereby automatically positioning the bucket in the desired level orientation.
  • the operator is free to direct his attention to lowering the bucketby appropriate actuation of the lift control valve 12 via the control lever 10.
  • the operator may have both the control valves 12, 14 held in the detent positions by the manipulation of the lever 10 to both the full rack-back and the raise positions to bring the arms 62 and 70 into contact with the electromagnet 42.
  • the electromagnet 42 is energized by closure of either or both of the normally open switches 104, 108 via the presence of the respective permanent magnets 112, 120.
  • magnet 124 is positioned to trigger the normally-closed switch 110 when the tilt hydraulic cylinder is fully retracted. Since the electromagnet 42 is still energized via thecontinued closure of the switch 106, control valve 14 is still held in a detented position. Thus, to avoid the continued operation of the hydraulic system over the relief valve pressure because of the continued actuation of the valve 14 after the tilt cylinder 46 is fully extended, a parallel hydraulic fluid flow system such as that of FIG. 5, may be employed.
  • conduits 134, 136 and 138 diverts fluid back to the tank when both the lift and tilt control valves 12, 14 are in the hold or neutral position.
  • Conduits 136, 138 allow the parallel coupling of the valves 12, 14, when either or both valves are shifted to an operative or open position. Therefore, when fluid flow is restricted in conduit 136, when tilt cylinder 46 bottoms out, fluid flow is diverted to lift cylinder 64 by conduit 138. Valves 12, 14 are released from the detent position when the magnet 114 triggers on the normally-closed switch 106. The bucket is thus in position to be dumped, whereupon the operator is ready to begin the next work cycle.
  • FIGS. 2 4 Although the embodiment of FIGS. 2 4 is herein described using two parallel electrical circuits, one for the bucket lift process and one for the bucket tilt process, it is to be understood that either of the electrical circuits may be used alone, as described with reference to the FIG. 1 embodiment. Likewise, the solid state relay circuit of FIGS. 2 4 may be employed in the embodiment of FIG. 1.
  • electromagnet means disposed to hold the control valve means in a given operating position when energized via selected movement of the control valve means
  • first magnetic field means including a first permanent magnet and lever means directly and positively coupled to the control valve means for selected movement therewith to a position adjacent the normally-open switch means to close the latter in response to the selected movement of the control valve means;
  • normally-closed magnetically-responsive means associated with the hydraulic cylinder means and disposed in series with the normallyswitch I open switch means, the electromagnet means and I the electrical energy source; second magnetic field means including a second permanent magnet coupled to the cylinder rod for selected movement therewith to a position adjacent the normally-closed switch means to open the latter in response to selected translation of the cylinder rod of the hydraulic cylinder means; said normally-open and normally-closed switch meansv being disposed to respectively energize and de-energize the electromagnet means in response to the selected movements.
  • the electromagnetic positioner of claim 1 further including a second pair of normally-open and normallyclosed switch means disposed in parallel with the first normally-open and normally-closed switch means, and a second pair of first and second magnetic field means disposed to selectively close and open the second pair of normally open and closed switch means respectively, wherein closure of either of the normally-open switch means energizes the electromagnet means and opening both of the normally-closed switch means de-energizes the electromagnet means.
  • the electromagnetic positioner of claim 2 wherein the vehicle includes a pair of hydraulic cylinder means having respective cylinder rods selectively coupled to the given vehicle component for cooperative lift and tilt operations, the combination further including a pair of self-centering control valve means, said electromagnet means being disposed to hold the control valve means in given operating positions upon selected movement of the latter in response to closure of at least one of the normally-open switch means.
  • the electromagnetic positioner of claim 3 further including, a single control lever disposed for fore-andaft and side-to-side movement, and mechanical linkage means coupling the single control lever to the pair of self-centering control valve means to allow respective translation of the pair of valve means in response to selected fore-and-aft and side-to-side movement of the single control lever.
  • the electromagnetic positioner of claim 3 wherein the electromagnet means includes a single electromag net disposed to hold both the control valve means in their operating positions, the positioner further including a parallel hydraulic fluid flow system coupled between the source of hydraulic fluid and the pair of hydraulic cylinder means to channel all the flow of hydraulic fluid to one cylinder means when the cylinder rod of the other has translated to either limit, notwithstanding the position of the control valve means associated with the latter.
  • the electromagnetic positioner of claim 1 further including solid state. relay means disposed to connect the electromagnet means and the electrical 'energy source in response to closure of the normally-open switch means, and to disconnect them in response to opening of the normally-closed switch means.
  • the solid state relay means includes a first transistor coupled to the normally-open and normally-closed switch means and responsive thereto, and a second transistor coupled to the-first transistor and responsive thereto to provide completion of the electrical circuit between the electromagnet means and the electrical energy source, the relay means being activated upon closure of the normally-open switch means and deactivated upon opening the normally-closed switch means.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
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  • Operation Control Of Excavators (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Load-Engaging Elements For Cranes (AREA)
US00284491A 1972-08-29 1972-08-29 Electromagnetic bucket positioner for heavy equipment vehicles and the like Expired - Lifetime US3823647A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00284491A US3823647A (en) 1972-08-29 1972-08-29 Electromagnetic bucket positioner for heavy equipment vehicles and the like
CA177,398A CA996664A (en) 1972-08-29 1973-07-26 Electromagnetic bucket positioner for heavy equipment vehicles and the like
BE134882A BE803958A (fr) 1972-08-29 1973-08-23 Dispositif electromagnetique de mise en position d'un element de vehicule
FR7331102A FR2198031B1 (ru) 1972-08-29 1973-08-28
JP48096264A JPS4958601A (ru) 1972-08-29 1973-08-29
GB4072173A GB1399789A (en) 1972-08-29 1973-08-29 Positioners
DE2344113A DE2344113C2 (de) 1972-08-29 1973-08-29 Stelleinrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00284491A US3823647A (en) 1972-08-29 1972-08-29 Electromagnetic bucket positioner for heavy equipment vehicles and the like

Publications (1)

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US3823647A true US3823647A (en) 1974-07-16

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US00284491A Expired - Lifetime US3823647A (en) 1972-08-29 1972-08-29 Electromagnetic bucket positioner for heavy equipment vehicles and the like

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US (1) US3823647A (ru)
JP (1) JPS4958601A (ru)
BE (1) BE803958A (ru)
CA (1) CA996664A (ru)
DE (1) DE2344113C2 (ru)
FR (1) FR2198031B1 (ru)
GB (1) GB1399789A (ru)

Cited By (7)

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DE2654642A1 (de) * 1975-12-04 1977-06-08 Komatsu Mfg Co Ltd Vorrichtung zum einstellen der lage und ausrichtung der schaufel eines schaufelladers
US4195551A (en) * 1977-06-23 1980-04-01 Gresen Manufacturing Company Hydraulic control valve including electromagnetic detent
US4256144A (en) * 1977-10-06 1981-03-17 Fiat-Allis Macchine Movimetno Terra S.P.A. Lever control for hydraulic control circuits
WO1983001820A1 (en) * 1981-11-20 1983-05-26 Melocik, Kurt, B. Single lever control with automatic valve latching
US4469007A (en) * 1981-11-20 1984-09-04 Caterpillar Tractor Co. Single lever control with automatic valve latching
EP0247303A2 (en) * 1986-05-09 1987-12-02 Toyo Unpanki Co., Ltd. Apparatus for controlling cargo handling position
US4917565A (en) * 1987-09-10 1990-04-17 Kubota Ltd. Apparatus for controlling posture of front loader

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
DE2500137C3 (de) * 1975-01-03 1980-06-19 O & K Orenstein & Koppel Ag, 1000 Berlin Hydrostatische Hilfskraftlenkung für SchaufeUader
US4459079A (en) * 1979-07-23 1984-07-10 Sperry Corporation Unloading auger control system
JPS60211522A (ja) * 1984-04-05 1985-10-23 Kubota Ltd 作業車の操作構造

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US3487958A (en) * 1968-01-31 1970-01-06 Caterpillar Tractor Co Self-cycling loader
US3524562A (en) * 1968-09-19 1970-08-18 Caterpillar Tractor Co Hydraulic controls for bucket loaders
US3659734A (en) * 1971-06-09 1972-05-02 Caterpillar Tractor Co Bucket positioning device utilizing a biased proximity switch
US3667723A (en) * 1969-12-11 1972-06-06 Bosch Gmbh Robert Electromagnetic detent means for sliding spools of directional control valves

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JPS4930967U (ru) * 1972-06-20 1974-03-16

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Publication number Priority date Publication date Assignee Title
US3487958A (en) * 1968-01-31 1970-01-06 Caterpillar Tractor Co Self-cycling loader
US3524562A (en) * 1968-09-19 1970-08-18 Caterpillar Tractor Co Hydraulic controls for bucket loaders
US3667723A (en) * 1969-12-11 1972-06-06 Bosch Gmbh Robert Electromagnetic detent means for sliding spools of directional control valves
US3659734A (en) * 1971-06-09 1972-05-02 Caterpillar Tractor Co Bucket positioning device utilizing a biased proximity switch

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2654642A1 (de) * 1975-12-04 1977-06-08 Komatsu Mfg Co Ltd Vorrichtung zum einstellen der lage und ausrichtung der schaufel eines schaufelladers
FR2333902A1 (fr) * 1975-12-04 1977-07-01 Komatsu Mfg Co Ltd Dispositif electromagnetique positionneur de benne pour vehicule de chargement
US4099449A (en) * 1975-12-04 1978-07-11 Kabushiki Kaisha Komatsu Seisakusho Electromagnetic bucket positioner for loader vehicles
US4195551A (en) * 1977-06-23 1980-04-01 Gresen Manufacturing Company Hydraulic control valve including electromagnetic detent
US4256144A (en) * 1977-10-06 1981-03-17 Fiat-Allis Macchine Movimetno Terra S.P.A. Lever control for hydraulic control circuits
WO1983001820A1 (en) * 1981-11-20 1983-05-26 Melocik, Kurt, B. Single lever control with automatic valve latching
US4469007A (en) * 1981-11-20 1984-09-04 Caterpillar Tractor Co. Single lever control with automatic valve latching
EP0247303A2 (en) * 1986-05-09 1987-12-02 Toyo Unpanki Co., Ltd. Apparatus for controlling cargo handling position
EP0247303A3 (en) * 1986-05-09 1989-10-25 Toyo Unpanki Co., Ltd. Apparatus for controlling cargo handling position
US4917565A (en) * 1987-09-10 1990-04-17 Kubota Ltd. Apparatus for controlling posture of front loader

Also Published As

Publication number Publication date
BE803958A (fr) 1974-02-25
CA996664A (en) 1976-09-07
DE2344113C2 (de) 1983-04-07
GB1399789A (en) 1975-07-02
JPS4958601A (ru) 1974-06-06
FR2198031B1 (ru) 1981-04-10
DE2344113A1 (de) 1974-04-18
FR2198031A1 (ru) 1974-03-29

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Owner name: CATERPILLAR INC., 100 N.E. ADAMS STREET, PEORIA, I

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

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Effective date: 19860515