WO1981003209A1 - Dispositif de commande de potentiometre et de commutateur - Google Patents

Dispositif de commande de potentiometre et de commutateur Download PDF

Info

Publication number
WO1981003209A1
WO1981003209A1 PCT/US1980/000519 US8000519W WO8103209A1 WO 1981003209 A1 WO1981003209 A1 WO 1981003209A1 US 8000519 W US8000519 W US 8000519W WO 8103209 A1 WO8103209 A1 WO 8103209A1
Authority
WO
WIPO (PCT)
Prior art keywords
rod member
rod
members
control
response
Prior art date
Application number
PCT/US1980/000519
Other languages
English (en)
Inventor
E Leskovec
Original Assignee
Towmotor Corp
E Leskovec
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 Towmotor Corp, E Leskovec filed Critical Towmotor Corp
Priority to GB8127442A priority Critical patent/GB2085557B/en
Priority to PCT/US1980/000519 priority patent/WO1981003209A1/fr
Priority to DE19803050359 priority patent/DE3050359A1/de
Priority to CA000366765A priority patent/CA1155203A/fr
Publication of WO1981003209A1 publication Critical patent/WO1981003209A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks

Definitions

  • This invention relates to control of hydraulic circuits of the type including a plurality of hydraulic motors operable by separate control valves, with fluid under pressure for the various valves and hydraulic motors being supplied by a single pump.
  • Hydraulic circuits of the type contemplated by the present invention are commonly employed, for example, in material handling vehicles such as lift trucks where the vehicles include a number of hydraulic motors or jacks which must be separately operable to regulate material handling implements associated with the vehicles.
  • one of the motors might be used to control tilting of a mast assembly of a lift truck, another might be used to control side shifting of a lift truck carriage, still another of the motors might be utilized to rotate the carriage and yet another of the motors might be utilized to control lifting of the carriage relative to the lift truck mast assembly.
  • There are a number of other machines which include a plurality of hydraulic motors which may be operated by a single hydraulic pump.
  • the present invention provides a control apparatus which may be adapted to use with such machines.
  • Rotation of the gang plate actuates a switch which controls the pump motor.
  • Such units are relatively difficult to adjust, since each of the cam shoes must be separately adjusted. Also, control is not as precise as would be desired. Further, the various cam shoes are relatively expensive to manufacture, thus, adding to the overall cost of the unit.
  • control unit of the aforementioned patent is not useful in all environments because of its bulk.
  • such a unit is relatively bulky for use in lift trucks where the unit is to be mounted adjacent the operator's seat.
  • control knobs of the unit thus lessening, somewhat, operator control of the various hydraulic motors.
  • the present invention is directed to overcoming one or more of the problems as set forth above.
  • an improvement is provided in a hydraulic system having an electric motor driven pump which supplies pressurized fluid to a control valve arrangement having a plurality of spool controlled valves which move from neutral in response to generally longitudinal movement of one of a plurality of rod members from a neutral position.
  • a single electric switch is provided in a circuit supplying power to the motor. The switch, when in a respective one of an open and a closed position, directs electric power to the motor, to rotate the pump and deliver pressurized fluid. When the switch is in a respective other of the open and closed positions, there is no electric power delivered to the motor.
  • the improvement comprises an elongated actuating member having a neutral position, along with means for mounting the member transversely to the rod members and to pivot about an axis orthogonal to the rod members.
  • the actuating member is biased into its neutral position.
  • Means are provided which engage the rod members with the actuating member and pivot the actuating member in a single direction from its neutral position when one of the rod members moves in either direction from its neutral position.
  • the switch is actuated to supply power to the pump motor when the actuating member is pivoted in the single direction.
  • an improvement in a hydraulic system having an electric motor driven pump which supplies pressurized fluid to a spool controlled valve with the spool being controlled by generally longitudinal movement of a rod member.
  • the system has a control element near the rod member and means for moving the control element in response to generally longitudinal movement of the rod member. Means are provided which vary the amount of power supplied to the motor in response to movement of the control element. Means are also provided for stopping movement of the control element in one direction, sufficient to damage the power varying means.
  • the improvement comprises having the control element moving means include means for allowing the rod member to continue to move in a direction, after the stopping means has prevented further movement of the control element in one direction.
  • Figure 1 is a perspective view of an embodiment of the subject apparatus having portions partially cut away and portions shown schematically;
  • Figure 2 is an enlarged front partial view, partially in section, of the embodiment illustrated in Figure 1;
  • Figure 3 is a sectional view taken along line III-III of Figure 2, showing one operation position of the improvement in phantom
  • Figure 4 is a sectional view taken along line III-III of Figure 2, showing another operation position of the improvement in phantom.
  • FIG. 1 Adverting first to Figure 1, there is illustrated therein a hydraulic system 10 of the nature wherein an electric motor 12 drives a pump 14 which supplies pressurized fluid to a stacked control valve arrangement 16, comprising a plurality of control valves l ⁇ a, 16b and 16c, having control spools 18a, 18b and 18c, respectively.
  • the control spools 18a, 18b and 18c are responsive to generally longitudinal movement of a rod structure 20, and more particularly responsive to movement of respective generally parallel rod members 20a, 20b and 20c.
  • a single electric switch 22, seen both structurally and schematically in Figure 1, is provided in a circuit 24, which supplies power from a voltage source, such as a lift truck battery, to the motor 12.
  • the switch 22 is actuatable between a first and second position.
  • the present invention is not directed to any specific circuitry for accomplishing the supplying of power to the motor 12. Circuitry which may be utilized is shown in previously discussed U.S. Patent 4,102,132. Since the present invention uses only a single switch 22 for the same purpose as the circuit of U.S. Patent 4,102,132 uses four microswitches, three of the parallel branches of the circuit of U.S. Patent 4,102,132 are omitted.
  • the control valve arrangement 16 directs flow from the pump 14 to one or more hydraulic motors 28a, 28b and 28c. Such comprise conventional structures and are well-known in the art.
  • means 30 are provided for placing the switch 22 in the first position, in response to generally longitudinal travel of any of the rod members 20a, 20b and 20c in either direction from a neutral position 32 as illustrated in Figures 1 and 2, and in solid lines in Figures 3 and 4.
  • the neutral position 32 of the rod members 20a, 20b and 20c corresponds to the switch 22 being in the second (other) position.
  • the neutral position 32 of the rod members 20a, -20b and 20c also corresponds to the spools 18a, 18b, 18c being in their neutral positions.
  • the rod members cause the placing means 30 to position the switch 22 in the one position responsive to generally longitudinal travel of any one of the rod members 20a, 20b and 20c in either direction from the neutral position 32.
  • the switch placing means 30 includes a longitudinally extending actuating member 34 having first and second end portions 35 and 36 (see Fig. 2) and which is generally spaced from each of the rod members 20a, 20b and 20c, substantially an equal distance.
  • Means 37 is provided for pivotally mounting the actuating member.
  • the means 37 includes a pair of pivot pins 38 which serve for mounting the actuating member 34 to pivot about an axis 40 substantially parallel to the longitudinal extension of the actuating member 34 (Figs. 3 and 4).
  • the pivot pins 38 are an integral part of end portions 35 and 36.
  • the actuating member 34 would normally be mounted by the pivot pins 38, to a support structure 41, for example, the front panel of a battery compartment (not illustrated) .
  • An appropriately sized and shaped cover 42 generally surrounds the various structures and is mounted to the support structure 41.
  • the ends 35 and 36 of actuating members 34 are pivotally connected to respective brackets 44 and 46 by the pins 38.
  • Means 48 are provided for setting the switch 22 in said first position, responsive to rotating of the actuating member 34, in a direction 50 from a neutral position 51 thereof to a first (rotated) position 52 shown in phantom in Figs. 3 and 4.
  • the neutral position 51 corresponds to the rod members 20a, 20b and 20c all being in their neutral position 32.
  • the means 48 for setting the switch 22, in the embodiment illustrated, comprises a switch actuating button 53 and a biasing spring 54 which normally biases the switch 22 open as shown in Fig. 1.
  • the button 53 is preferably the head of a screw which provides fine adjustment of the opened and closed positions of the switch 22.
  • Means 56 serves for biasing the actuating member 34 in the neutral position 51.
  • the particular biasing means 56 shown in the illustrated embodiment is a spring 58 which acts between the support structure 41 and the actuating member 34.
  • Means- 60 serves for pivoting the actuating member 34 in the direction 50, responsive to longitudinal movement of the rod structure 20, and more particularly responsive to
  • the illustrated pivoting means 60 includes a plurality of first members 62a, 62b and 62c, supported by the rod structure 20, in particular supported by the rod members 20a, 20b and 20c (20b in Figures 3 and 4) , and positioned to contact a first face 64 of the actuating member 34 on a first side 66 of a plane 67 including the axis 40 and generally parallel to the rod members 20a, 20b and 20c.
  • the pivoting means 60 also includes a plurality of second members 68a, 68b and 68c supported by the rod structure 20, (rod member 20b in Figures 3 and 4) , and positioned to contact a second face 70 of the actuating member 34 on a second side 72 of the plane 67.
  • Second members 68a, 68b and 68c each have an elongated slot 73 therein for permitting longitudinal adjustment of each of the second members relative to the rod structure 20.
  • each of the rod members 20a, 20b and 20c is formed of a pair of bars 74 and 76, and the first members 62a, 62b and 62c serve to fasten together the two bars 74 and 76 at a point between their ends.
  • a top end of each of the bars 74 and 76 is pivotally attached at a pivot 78 to a respective lever 80a, 80b and 80c which serves to motivate the respective rod member 20a, 20b and 20c to move generally longitudinally up or down at the operator's choice.
  • each of the rod members 20a, 20b and 20c is pivotally attached at a respective pivot 82a, 82b 82c, to the respective control spool 18a, 18b and 18c.
  • longitudinal movement of any one of the bar members 20a, 20b and 20c results in generally longitudinal movement of the respective spool 18a, 18b and 18c, which in turn adjusts the output of the respective " control valve 16a, 16b and 16c to the respective hydraulic motor 28a, 28b and 28c.
  • the particular actuating member 34 illustrated in the drawings includes a plurality of fingers 84a, 84b and 84c which extend to between the respective bars 74 and 76, and are in contact with the respective first members 62a, 62b and 62c.
  • the second members 68a, 68b and 68c can be brackets which are attached to respective of the rod members 20a, 20b and 20c.
  • Each of the second members 68a, 68b and 68c has a finger, 86a, 86b and 86c, which reaches over past the axis 40 to contact the second face 70 of the actuating member 34.
  • a respective lever 80a, 80b or 80c is rotated to cause its respective rod member 20a, 20b or 20c to move longitudinally downwardly, the respective finger 86a, 86b or 86c pushes downwardly upon the second face 70 of the
  • control valve 88 which may be part of the stacked control valve arrangement 16 and may be controlled by movement of a control spool 90 thereof.
  • This control valve 88 may control, for example, a function such as the lift function of a lift truck wherein the motor 12 is required to control the pump 14 to provide a much higher flow rate to a lift cylinder 91, than is required for any other function of the truck, and/or to provide a variable flow rate.
  • the control spool 90 of the control valve 88 is controlled by linear movement of a rod member 92 which is pivotally connected at a pivot 94 to the control spool 90.
  • the rod member 92 is connected to the control spool 90 by a structure sufficient to cause longitudinal movement of the control spool 90 in response to generally longitudinally movement of the rod-member 92.
  • means 96 for example, a potentiometer 98
  • the potentiometer 98 may function in the manner discussed in previously mentioned U.S. Patent 4,102,132.
  • a control element 100 is provided adjacent the specific function rod member 92.
  • Means 102 are provided-for moving the control element 100 responsive to generally longitudinal movement of the specific function rod member 92 on rotation of a lever 101.
  • the means 96 serves for controllably . varying the amount of electric power supplied to the motor 23 responsive to movement of the control member 100.
  • the control element 100 is a rotary control shaft which extends from the potentiometer 98.
  • the element moving means 102 has an arm 104 attached to extend generally radially from the rotary control shaft 100 to adjacent the rod member 92.
  • the element moving means 102 also has means 106 for directly engaging the rod member 92 with the arm 104 as the rod member 92 moves in a first longitudinal direction 108 (upwardly in Figures 1 and 2) and means 110 for indirectly engaging the rod member 92 with the arm 104 via a spring 111 as the rod member 92 moves in a second longitudinal direction 112 (downwardly in Figures 1 and 2) .
  • the pivoting means 102 has an arm 104 attached to extend generally radially from the rotary control shaft 100 to adjacent the rod member 92.
  • the element moving means 102 also has means 106 for directly engaging the rod member 92 with the arm 104 as the rod member 92 moves in a first longitudinal direction 108 (upwardly in Figures 1 and 2) and means 110 for indirectly engaging the rod member
  • a switching function can be built into the potentiometer 98, or a separate switch may be tripped by the control spool 90, as in previously discussed U.S. Patent 4,102,132, or the pumping system may be such that the pump 14 is continuously operating at a low speed, and the potentiometer 98 varies operation of the motor 12 to raise or lower the output of the pump 14.
  • a tab 114 extends laterally from the rod member 92 and is fastened thereto.
  • a metal rod 116 fits through a hole 118 in the arm 104.
  • the metal rod 116 then proceeds upwardly through a hole 120 in the tab 114.
  • a loop 122 or other stop means is formed in the metal rod 116 just above the hole 120 in the tab 114.
  • the metal rod 116 continues upwardly from the loop 122 to a closed loop 123 at its top 124.
  • the closed loop 123 is connected to the spring 111 by an integral hook 125.
  • the spring 111 is connected by another integral hook 126 to a hole 127 in the tab 114.
  • a stop 128 formed in a bracket 130 serves to prevent the arm 104 from moving downwardly beyond a desired position corresponding to the rod member 92 being at its neutral position. It will be noted that the rod member 92 can still move downwardly beyond that position, since the spring 111 will si ply be stretched by this motion.
  • the stop 128 thus protects the potentiometer 98 from being damaged by overly rotating the control shaft 100 and provides a specific zeroing point for the resistance in the potentiometer 98.
  • the just described structure is particularly advantageous for use with lift trucks, and even more particularly advantageous for use with lift trucks of the electrically powered variety.
  • the support structure 41 is normally the front of the battery compartment of such a. lift truck, adjacent the operator's seat, which normally sits on top of the battery compartment. Because of the compact nature of the overall apparatus it can be conveniently placed in such a location.
  • each of rod members 20a, 20b and 20c on member 34 is such that any up or down movement of any rod, 20a, 20b or 20c, rotates member 34 clockwise (Figs. 3 and 4) about the axis 40 and activates the single switch 22 so that more pump power is produced.
  • the direct action resulting from linear movement of the rod members 20a, 20b and 20c on the member 34 provides precise control of the pump 14 in response to such linear movement.
  • Prior art multiple spool single switch controls have not provided such precise control.
  • the potentiometer actuating member for the fourth function which would normally be the lift function of a lift truck, allows the providing of a higher flow rate from the pump 14 in response to upward movement of the specific function rod member 92.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Fluid Gearings (AREA)

Abstract

Dans des systemes existants, une pluralite de moteurs hydrauliques (28a, 28b, 28c) recoivent du fluide sous pression d'une seule pompe (14) qui est elle-meme entrainee par un moteur electrique (12). Un appareil a permis d'ajuster le courant qui alimente le moteur electrique (12), et par consequent de regler le debit de la pompe (14), en reponse a l'actionnement d'un ou plusieurs moteurs hydrauliques (28a, 28b, 28c) par l'operateur. Cependant un tel appareil a generalement ete encombrant, complique et/ou difficile a installer et/ou entretenir. Une amelioration consiste a monter un simple commutateur (22) soit dans une position ouverte soit dans une position fermee lorsqu'un organe allonge (34) place transversalement par rapport a une pluralite de bielles paralleles (20a, 20b, 20c) tourne en reponse au deplacement longitudinal dans l'une ou l'autre des deux directions depuis une position neutre (32) de l'une des bielles (20a, 20b, 20c). Le mouvement longitudinal de chacune des bielles (20a, 20b, 20c) commande, via une soupape respective (16a, 16b, 16c) l'action du moteur hydraulique respectif (28a, 28b, 28c).
PCT/US1980/000519 1980-05-05 1980-05-05 Dispositif de commande de potentiometre et de commutateur WO1981003209A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB8127442A GB2085557B (en) 1980-05-05 1980-05-05 Potentiometer and switch control arrangement
PCT/US1980/000519 WO1981003209A1 (fr) 1980-05-05 1980-05-05 Dispositif de commande de potentiometre et de commutateur
DE19803050359 DE3050359A1 (de) 1980-05-05 1980-05-05 Potentiometer and switch control arrangement
CA000366765A CA1155203A (fr) 1980-05-05 1980-12-15 Dispositif de commande a potentiometre et a commutateur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/US1980/000519 WO1981003209A1 (fr) 1980-05-05 1980-05-05 Dispositif de commande de potentiometre et de commutateur
WOUS80/00519 1980-05-05

Publications (1)

Publication Number Publication Date
WO1981003209A1 true WO1981003209A1 (fr) 1981-11-12

Family

ID=22154325

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1980/000519 WO1981003209A1 (fr) 1980-05-05 1980-05-05 Dispositif de commande de potentiometre et de commutateur

Country Status (4)

Country Link
CA (1) CA1155203A (fr)
DE (1) DE3050359A1 (fr)
GB (1) GB2085557B (fr)
WO (1) WO1981003209A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0211379A1 (fr) * 1985-07-30 1987-02-25 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Mécanisme de détection du déplacement pour circuit hydraulique d'un élévateur à fourche
EP0232073A2 (fr) * 1986-01-25 1987-08-12 Yale Materials Handling Limited Véhicules de manutention de matériaux

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3962871A (en) * 1975-04-30 1976-06-15 Towmotor Corporation Control means adjustably synchronizing operation of a single pump with a plurality of control valves
US4102132A (en) * 1977-03-22 1978-07-25 Towmotor Corporation Motor control

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3962871A (en) * 1975-04-30 1976-06-15 Towmotor Corporation Control means adjustably synchronizing operation of a single pump with a plurality of control valves
US4102132A (en) * 1977-03-22 1978-07-25 Towmotor Corporation Motor control

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0211379A1 (fr) * 1985-07-30 1987-02-25 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Mécanisme de détection du déplacement pour circuit hydraulique d'un élévateur à fourche
EP0232073A2 (fr) * 1986-01-25 1987-08-12 Yale Materials Handling Limited Véhicules de manutention de matériaux
EP0232073A3 (fr) * 1986-01-25 1989-07-05 Yale Materials Handling Limited Véhicules de manutention de matériaux

Also Published As

Publication number Publication date
CA1155203A (fr) 1983-10-11
GB2085557A (en) 1982-04-28
GB2085557B (en) 1983-08-03
DE3050359A1 (de) 1982-06-03

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