US3834731A - Automatic horizontal positioning device for load handling vehicle - Google Patents

Automatic horizontal positioning device for load handling vehicle Download PDF

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Publication number
US3834731A
US3834731A US00298816A US29881672A US3834731A US 3834731 A US3834731 A US 3834731A US 00298816 A US00298816 A US 00298816A US 29881672 A US29881672 A US 29881672A US 3834731 A US3834731 A US 3834731A
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United States
Prior art keywords
outriggers
vehicle
pressure
positioning device
load handling
Prior art date
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
US00298816A
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English (en)
Inventor
T Uehara
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Furukawa Co Ltd
Original Assignee
Unic Corp
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Publication date
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Publication of US3834731A publication Critical patent/US3834731A/en
Assigned to FURUKAWA COMPANY LIMITED, A CO. OF JAPAN reassignment FURUKAWA COMPANY LIMITED, A CO. OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: UNIC CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D37/00—Stabilising vehicle bodies without controlling suspension arrangements

Definitions

  • ABSTRACT An automatic horizontal positioning device for a load handling vehicle such as a truck crane, comprising sensing means for sensing tilting of the vehicle having a weight causing contacts of limit switches to close when the vehicle is tilted, magnet valves adapted to be operated in response to the sensing means to supply hydraulic pressure to head ends of vertical outriggers at the lowered portions of the vehicle, and pressure switches for changing over said magnet valves to shut off the hydraulic pressure to the head ends of the vertical Outriggers when pressure in the head end chambers exceeds a predetermined value resulting from the abutment of the extended outriggers against the ground, whereby the'vehicle body is always maintained in its horizontalposition.
  • This invention relates to an automatic horizontal positioning device for a load handling vehicle such as a truck crane having a plurality of outriggers equipped on front and rear portions on both sides thereof.
  • the outriggers would be individually adjusted to correct the tilting of the vehicle or the floating of the outriggers.
  • the term floating of outriggers as used herein is intended to designate a status of outriggers out of contact with the ground and ineffective as outriggers.
  • Such a kind of load handling vehicle with outriggers to be adjusted individually is very difficult in operation of the outriggers for bringing the vehicle into a desired position or its horizontal position.
  • the automatic horizontal positioning device for a load handling vehicle having a plurality of outriggers equipped on front and rear portions on both sides thereof comprises sensing means for sensing tilting of a body of the vehicle, means responsive to said sensing means to change over the passages for supplying hydraulic pressure to said outriggers, and pressure responsive means responsive to the pressure in the outrigges to operate said changeover means, thereby when said vehicle body is tilted or said outriggers are floating said sensing means causes the required outriggers to operate to maintain said vehicle body in its horizontal position.
  • the horizontal positioning device comprises a bracket upstandingly fixed to a stationary base mounted on a body of the vehicle, a weight rockably hanging from said bracket, limit switches arranged around said weight correspondingly to the positions of respective outriggers to form slight clearances between said weight and contacts of said limit switches when said vehicle body is horizontal, magnet valves included in respective conduits for supplying pressurized fluid to said outriggers for changing over the oil passageways to the head end and rod end chambers, said each limit switches being included in the electric circuits of said magnet valves, and pressure switches responsive to the increase in hydraulic pressure in the respective head end chambers of said outriggers, thereby when said vehicle body is tilted or said outriggers are floating said limit switches cause the required outriggers to operate to maintain said vehicle body in its horizontal position.
  • An object of the invention is to provide an automatic horizontal positioning device for a load handling vehicle capable of always holding the vehicle in safe condition by the automatic operation of the outriggers in the event of tilting of the vehicle and floating of the outriggers.
  • FIG. 1 is an elevational view of a truck crane on which the automatic horizontal positioning device according to the invention is installed;
  • FIG. 2 is a plan view of FIG. 1;
  • FIG. 3 is a detailed front elevation of sensing means employed in the device according to the invention.
  • FIG. 4 is a plan view of FIG. 3:;
  • FIG. 5 shows a hydraulic circuit used in the device according to the invention
  • FIG. 6 shows a relation of a pressure switch to an outrigger
  • FIG. 7 illustrates the electric circuit system employed in the present invention.
  • a truck crane l on which a horizontal positioning device according to the inven tion is installed, comprises a rear body 2, a swivel slide 3 mounted thereon, a crane 4 the lower end of which is pivotally secured to the slide 3 elevatably and degradably, four vertical outriggers 5 arranged on front and rear portions on both sides of the body 2, and four horizontal outriggers 6 which serve to project the vertical outriggers 5 beyond the sides. of the body 2.
  • a stationary base 7 is fixed onto the body 2 and is provided with a bracket 8 upstandingly fixed to the base 7 for suspending a weight.
  • the bracket 8 has at its upper end a horizontal portion 8a from which a weight 10 is rockably suspended by means of a hook 9 (clearly shown in FIG. 3).
  • limit switches LS,LS ' are arranged on the base 7 correspondingly to the positions of respective outriggers 5 so as to respond to tilting of the vehicle body to cause the vertical outrigger or outriggers to extend or retract such that the vehicle body is brought into its horizontal position.
  • Contacts 11a of the limit switches are positioned to form slight clearances 12 with the peripheral surface of the weight 10 depending from the bracket 8 when the vehicle body is horizontal.
  • FIG. 5 illustrates a hydraulic circuit for use in the device according to the invention, which comprises an oil pump 13, an engine 14, a reservoir 15, and conduits 16 for supplying pressurized oil to chambers at head ends and rod ends of piston and cylinder assemblies for the vertical and horizontal outriggers 5 and 6, these conduits including magnet valves for changing over the oil passageways to the head end and rod end chambers.
  • the circuit further includes a relief valve 17.
  • oil under pressure to be supplied to the horizontal outriggers 6 is controlled by the magnet valves each having a solenoid SOL,SOL and oil under pressure to the vertical outriggers 5 is controlled by the magnet values each having a solenoid SOL SOL,
  • any one of switches SW,SW for changing over the magnet valves is closed to one side, for example upwardly as viewed in FIG. 7 to change oer the magnet valve as shown in FIG. 5 from the shut-off position A to the position B wherein the vertical or horizontal outrigger 5 or 6 starts to extend its piston rod.
  • any one of the switches SW SW is closed to the other side, that is, downwardly as viewed in FIG. 7 to change over the magnet valve as shown in FIG. 5 from the position 8 to the position C wherein the vertical or horizontal outrigger 5 or 6 starts to retract its piston rod.
  • a pressure switch PS is provided in the conduit 16 communicating with the head end chamber of each vertical outrigger 5.
  • the pressure switch operates at the moment the oil pressure in the head end chamber exceeds the predetermined pressure resulting from the fact that the extended outrigger has abutted against the ground to ensure that required outriggers are extended to prevent the part of the vehicle body from being raised too far and the vehicle body is maintained in its horizontal position.
  • the power source switch SWa as shown in FIG. 7 is first switched on to light a pilot lamp PLa and then the magnet valve switches SW -SW are switched on to the same side to extend the horizontal outriggers to their maximum extent.
  • An automatic horizontal positioning switch SWb is then switched on to close the contacts of four-pole relays AR AR causing the pressure switches PS,-PS to operate in response thereto so that the solenoids SOL SOL SOL and SOL become conductive permitting the respective magnet valves to change over with the result that the vertical outriggers begin to extend.
  • a pilot lamp PLb is being lighted.
  • the pressure switches PS,-PS are opened. In this way the vehicle body is securely held on the ground through the outriggers. So long as the vehicle body is horizontal, the pilot lamp PLb is not lighted.
  • the weight 10 will close the limit switch LS causing the solenoid SOL to become conductive thereby changing over the magnet valve permitting extension of the vertical outrigger at the lowered portion of the body.
  • the weight 10 is out of contact with the limit switch LS to stop the extension of the outrigger and therefore the vehicle body can be maintained in a horizontal position. Then the pilot lamp is not lighted which indicates the fact that the horizontal positioning operation of the device has been accomplished.
  • the tilting of a vehicle body and the floating of outriggers are electrically detected and then the outriggers are immediately operated to cause the vehicle body to automatically return into its horizontal position and securely held it in the position.
  • the vehicle body In the operating cycle of a load handling vehicle on which the device is installed, the vehicle body can be held in its horizontal position and the floating of outriggers can be corrected quickly and reliably.
  • the horizontal positioning device according to the invention is easy in operation, simple in construction and inexpensive to be manufactured in comparison with the prior art devices and further provides greater safety in crane operation.
  • An automatic horizontal positioning device for a load handling vehicle having a plurality of outriggers equipped on front and rear portions on both sides thereof, comprising sensing means for sensing tilting of a body of the vehicle, means responsive to said sensing means to change over passages for supplying hydraulic pressure to said outriggers, and pressure responsive means responsive to the pressure in the outriggers to operate said change-over means, said pressure responsive means comprising a pressure switch in the conduit communicating with a head end chamber of each vertical outrigger; thereby when said vehicle body is tilted or said outriggers are floating said sensing means causes the required outriggers to operate to maintain said vehicle body in its horizontal position.
  • An automatic horizontal positioning device for a load handling vehicle as set forth in claim 1, wherein said sensing means comprises a bracket fixed to a rear body of the vehicle and having at its upper end a horizontal portion from which a weight is rockably suspended by means of a hook to form slight clearances between the peripheral surface of the weight and contacts of limit switches arranged correspondingly to the positions of said outriggers.
  • An automatic horizontal positioning device for a load handling vehicle having a plurality of outriggers equipped on front and rear portions of both sides thereof, comprising a bracket upstandingly fixed to a stationary base mounted on a body of the vehicle, a weight rockably hanging from said bracket, limit switches arranged around said weight correspondingly to the positions of respective outriggers to form slight clearances between said weight and contacts of said limit switches when said vehicle body is horizontal, magnet valves included in respective conduits for supplying pressurized fluid to said outriggers for changing over the oil passageways to the head end and rod end chambers, each of said limit switches being included in the electric circuits of said magnet values, and pressure switches responsive to the increase in hydraulic pressure in the respective head end chambers of said outriggers, so that when said vehicle body is tilted or said outriggers are floating said limit switches cause the required outriggers to operate to maintain said vehicle body in its horizontal position.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
  • Jib Cranes (AREA)
US00298816A 1971-11-02 1972-10-19 Automatic horizontal positioning device for load handling vehicle Expired - Lifetime US3834731A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46086723A JPS5119646B2 (fr) 1971-11-02 1971-11-02

Publications (1)

Publication Number Publication Date
US3834731A true US3834731A (en) 1974-09-10

Family

ID=13894776

Family Applications (1)

Application Number Title Priority Date Filing Date
US00298816A Expired - Lifetime US3834731A (en) 1971-11-02 1972-10-19 Automatic horizontal positioning device for load handling vehicle

Country Status (8)

Country Link
US (1) US3834731A (fr)
JP (1) JPS5119646B2 (fr)
AU (1) AU443654B2 (fr)
CA (1) CA992649A (fr)
DE (1) DE2253755C3 (fr)
FR (1) FR2158426B1 (fr)
GB (1) GB1408445A (fr)
ZA (1) ZA727519B (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3912288A (en) * 1974-08-21 1975-10-14 Us Army Vehicle level control
US4109733A (en) * 1977-08-29 1978-08-29 Bucyrus-Erie Company Tilt preventing system for drills
US4264014A (en) * 1978-11-06 1981-04-28 Caterpillar Tractor Co. Lock out means for pivotal axle suspension cylinders
US4568103A (en) * 1984-07-27 1986-02-04 The United States Of America As Represented By The Secretary Of The Army Vehicle anchoring system
US5641261A (en) * 1993-10-18 1997-06-24 Taylor Iron-Machine Works, Inc. Fork lift truck
US20090272952A1 (en) * 2005-07-27 2009-11-05 Jose Manuel Alguera Support jack with supporting load indicator
US20160185322A1 (en) * 2013-05-08 2016-06-30 Schwing Gmbh Device for supporting a mobile device on the ground
US20170297469A1 (en) * 2016-04-19 2017-10-19 Palfinger Liftgates, LLC Side-loading liftgate having integrated stabilizer leg

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5370286A (en) * 1976-12-01 1978-06-22 Tadano Tekkosho:Kk Automatic expansion controller for four or more jacks
DE3938766A1 (de) * 1989-11-23 1991-05-29 Rexroth Mannesmann Gmbh Niveauregelung
AT387U1 (de) * 1994-07-01 1995-09-25 Palfinger Ag Hydraulisch aus- und einfahrbare stuetze fuer ein mit einem ladekran versehenes lastfahrzeug
DE19525673C1 (de) * 1995-07-14 1996-10-02 Liftlux Ag Verfahren zur Niveauregulierung von Arbeitsgerätschaften

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2362135A (en) * 1940-12-19 1944-11-07 Robert H Ray Inc Leveling device for gravimeters
US2472944A (en) * 1947-03-31 1949-06-14 Furer Gyroscopically stabilized camera boom
US3161739A (en) * 1961-05-15 1964-12-15 Leonard S Suozzo Level and position sensing switch and indicating apparatus for piping or the like
US3523698A (en) * 1968-10-03 1970-08-11 Ralph Bishop Levelling system for trailers and the like
US3669409A (en) * 1970-12-14 1972-06-13 John Eranosian Vehicle attitude stabilization and control system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR727552A (fr) * 1931-11-21 1932-06-20 Pour
FR1411719A (fr) * 1964-06-08 1965-09-24 Tiroir de distribution, notamment pour machines à injecter les matières thermodurcissables
US3289868A (en) * 1964-12-16 1966-12-06 Jack Neun Lift system for cargo containers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2362135A (en) * 1940-12-19 1944-11-07 Robert H Ray Inc Leveling device for gravimeters
US2472944A (en) * 1947-03-31 1949-06-14 Furer Gyroscopically stabilized camera boom
US3161739A (en) * 1961-05-15 1964-12-15 Leonard S Suozzo Level and position sensing switch and indicating apparatus for piping or the like
US3523698A (en) * 1968-10-03 1970-08-11 Ralph Bishop Levelling system for trailers and the like
US3669409A (en) * 1970-12-14 1972-06-13 John Eranosian Vehicle attitude stabilization and control system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3912288A (en) * 1974-08-21 1975-10-14 Us Army Vehicle level control
US4109733A (en) * 1977-08-29 1978-08-29 Bucyrus-Erie Company Tilt preventing system for drills
US4264014A (en) * 1978-11-06 1981-04-28 Caterpillar Tractor Co. Lock out means for pivotal axle suspension cylinders
US4568103A (en) * 1984-07-27 1986-02-04 The United States Of America As Represented By The Secretary Of The Army Vehicle anchoring system
US5641261A (en) * 1993-10-18 1997-06-24 Taylor Iron-Machine Works, Inc. Fork lift truck
US20090272952A1 (en) * 2005-07-27 2009-11-05 Jose Manuel Alguera Support jack with supporting load indicator
US8382069B2 (en) * 2005-07-27 2013-02-26 Jost-Werke Gmbh Support jack with supporting load indicator
US20160185322A1 (en) * 2013-05-08 2016-06-30 Schwing Gmbh Device for supporting a mobile device on the ground
US20170297469A1 (en) * 2016-04-19 2017-10-19 Palfinger Liftgates, LLC Side-loading liftgate having integrated stabilizer leg
US10005381B2 (en) * 2016-04-19 2018-06-26 Palfinger Liftgates, LLC Side-loading liftgate having integrated stabilizer leg

Also Published As

Publication number Publication date
JPS4851420A (fr) 1973-07-19
ZA727519B (en) 1973-11-28
AU443654B2 (en) 1974-01-03
CA992649A (en) 1976-07-06
DE2253755C3 (de) 1981-01-22
GB1408445A (en) 1975-10-01
FR2158426B1 (fr) 1976-06-04
DE2253755A1 (de) 1973-06-14
FR2158426A1 (fr) 1973-06-15
AU4800172A (en) 1974-01-03
DE2253755B2 (de) 1980-05-14
JPS5119646B2 (fr) 1976-06-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: FURUKAWA COMPANY LIMITED, 6-1, 2-CHOME, MARUNOUCHI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UNIC CORPORATION;REEL/FRAME:004926/0937

Effective date: 19880616

Owner name: FURUKAWA COMPANY LIMITED, A CO. OF JAPAN,JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UNIC CORPORATION;REEL/FRAME:004926/0937

Effective date: 19880616