GB1203404A - Lift truck control - Google Patents

Lift truck control

Info

Publication number
GB1203404A
GB1203404A GB9464/69A GB946469A GB1203404A GB 1203404 A GB1203404 A GB 1203404A GB 9464/69 A GB9464/69 A GB 9464/69A GB 946469 A GB946469 A GB 946469A GB 1203404 A GB1203404 A GB 1203404A
Authority
GB
United Kingdom
Prior art keywords
mast
pump
extension
circuit
operator
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
Application number
GB9464/69A
Inventor
Henry J Thomas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Doosan Bobcat North America Inc
Original Assignee
Clark Equipment 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 Clark Equipment Co filed Critical Clark Equipment Co
Publication of GB1203404A publication Critical patent/GB1203404A/en
Expired legal-status Critical Current

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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S60/00—Power plants
    • Y10S60/911—Fluid motor system incorporating electrical system

Landscapes

  • 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)
  • Forklifts And Lifting Vehicles (AREA)
  • Handcart (AREA)

Abstract

1,203,404. Masted lift trucks. CLARK EQUIPMENT CO. 21 Feb., 1969 [26 March, 1968], No. 9464/69. Heading B8H. The three-section mast of a lift truck is extendible at two speeds, and is provided with a control system which permits high speed extension only when the mast is extended above a predetermined height. As shown, the mast ram 24 is extended by actuating a pump P 1 alone or pumps P 1 , P 2 together. The return circuit from the ram to the reservoir 18 includes a restrictor 72 which may be by-passed through a valve 78 and line 76 to produce higher speed lowering of the mast. In operation, to extend the mast, the operator closes switches in the electrical control circuit, Fig. 3 (not shown), to actuate the motor of pump P 1 . After a predetermined extension of the mast, a cam closes a switch in the circuit of the motor of pump P 2 whereby, closing of a further switch by the operator causes the pump P 2 to operate, after a time delay, to produce high speed extension of the mast. As the mast approaches within a predetermined distance of its full extension, a cam opens a further switch to de-energize both pump motors. To move the mast to its fully extended position, the operator then closes further switches to complete the circuit of the motor of pump P 1 to produce low-speed extension of the mast. To retract the mast, the operator closes switches in a circuit containing solenoids of valves 74, 78. Initially, valve 74 opens to allow low-speed retraction of the mast and then, after a time delay, valve 78 opens to by-pass the restrictor 72 to allow high-speed retraction of the mast.
GB9464/69A 1968-03-26 1969-02-21 Lift truck control Expired GB1203404A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US71623968A 1968-03-26 1968-03-26

Publications (1)

Publication Number Publication Date
GB1203404A true GB1203404A (en) 1970-08-26

Family

ID=24877282

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9464/69A Expired GB1203404A (en) 1968-03-26 1969-02-21 Lift truck control

Country Status (7)

Country Link
US (1) US3486333A (en)
JP (1) JPS491419B1 (en)
BE (1) BE727937A (en)
BR (1) BR6906795D0 (en)
DE (1) DE1913575A1 (en)
FR (1) FR2004706A1 (en)
GB (1) GB1203404A (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1429785A (en) * 1972-04-19 1976-03-24 Miller D M Lifting and loading device
DE2253199C2 (en) * 1972-10-30 1981-09-17 J.P. Sauer & Sohn GmbH gegründet 1751, 2330 Eckernförde Trigger mechanism for handguns with set trigger
US4097791A (en) * 1975-12-01 1978-06-27 Towmotor Corporation Delayed turn-on and turn-off control circuit
US4164121A (en) * 1978-05-17 1979-08-14 Eaton Corporation Control apparatus for industrial trucks
DE3019374A1 (en) * 1980-05-21 1981-11-26 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen KNIFE SHIELD CONTROL
US4598797A (en) * 1984-04-13 1986-07-08 Clark Equipment Company Travel/lift inhibit control
SE449482B (en) * 1985-07-08 1987-05-04 Bygg Och Transportekonomie Ab DEVICE FOR OPENING THE BRAKE FORM OF INDUSTRIAL TRUCKS
US20040128950A1 (en) * 1993-07-07 2004-07-08 Weder Donald E. Single station covering and fastening system
SE505606C2 (en) * 1994-11-28 1997-09-22 Bt Ind Ab Device, by a forklift, for attenuation of shocks and blows in the lifting motion
JP2001316096A (en) * 2000-02-28 2001-11-13 Toyota Industries Corp Hydraulic device for industrial vehicle
DE202006000552U1 (en) * 2006-01-14 2006-03-16 Jungheinrich Ag pallet truck
US20080257651A1 (en) * 2007-04-23 2008-10-23 Williamson Joel L Lift truck with productivity enhancing package including variable tilt and vertical masting
DE102007049392A1 (en) * 2007-05-29 2008-12-04 Linde Material Handling Gmbh fork-lift truck
DE102018104586A1 (en) 2018-02-28 2019-08-29 Jungheinrich Aktiengesellschaft Truck with at least one hydraulic mast lifting cylinder

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2359112A (en) * 1943-08-14 1944-09-26 Otis Elevator Co Hydraulic elevator
US3016973A (en) * 1958-12-29 1962-01-16 Clark Equipment Co Lift truck
US3135357A (en) * 1959-06-08 1964-06-02 Clark Equipment Co Lift truck control system
US3213967A (en) * 1961-05-18 1965-10-26 Clark Equipment Co Lift truck
US3443380A (en) * 1968-01-02 1969-05-13 Allis Chalmers Mfg Co Two-pump system for lift cylinder

Also Published As

Publication number Publication date
FR2004706A1 (en) 1969-11-28
JPS491419B1 (en) 1974-01-14
DE1913575A1 (en) 1969-10-09
BR6906795D0 (en) 1973-02-15
BE727937A (en) 1969-07-16
US3486333A (en) 1969-12-30

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee