GB1342407A - Lift truck - Google Patents

Lift truck

Info

Publication number
GB1342407A
GB1342407A GB3046871A GB3046871A GB1342407A GB 1342407 A GB1342407 A GB 1342407A GB 3046871 A GB3046871 A GB 3046871A GB 3046871 A GB3046871 A GB 3046871A GB 1342407 A GB1342407 A GB 1342407A
Authority
GB
United Kingdom
Prior art keywords
pressure
valve
mast
lift
ram
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
GB3046871A
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.)
BYGG OCH TRANSPORTEKONOMIE AB
Original Assignee
BYGG OCH TRANSPORTEKONOMIE AB
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 BYGG OCH TRANSPORTEKONOMIE AB filed Critical BYGG OCH TRANSPORTEKONOMIE AB
Publication of GB1342407A publication Critical patent/GB1342407A/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
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/003—Safety devices, e.g. for limiting or indicating lifting force for fork-lift trucks
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

1342407 Lift trucks BYGG-OCH TRANSPORTEKONOMI (BT) AB 29 June 1971 [1 July 1970] 30468/71 Heading B8H A lift truck comprises a mast 8, load carriage having a pair of forks 9, an hydraulic lifting ram 5 operatively connected to effect movement of the forks 9, the hydraulic system which includes the ram 5 including pre-set and adjustable pressure regulating valves 3, 7, Fig. 3, which control the pressure in the cylinder 5 and thus the lift capacity of the lift truck. Up to a certain point on the mast 8 the pre-set valve 3 controls the supply of oil from a tank 6 to the ram 5, the load capacity being constant up to that point, at which point the adjustable valve Y takes over and decreases the lift capacity linearly, the said valve being adjusted by means of a wire 10 connected thereto and to the load carriage at 11. In a second embodiment of the hydraulic system for the lift truck, Fig. 5 (not shown), three fixedly set pressure regulating valves (20), (21), (22) are arranged in parallel and have supply conduits provided with electrically controlled stop valves (17), (18), (19) respectively which are normally shut-off when a pre-set valve (3) controls the pressure to the lifting ram, but are opened when the load carriage reaches heights (h17), (h18), (h19), Fig. 6 (not shown), the opening being effected by means of limit switches (not shown) placed on the mast. The pressure in the lifting ram is thus reduced from a maximum pressure (Pmax), which prevails therein when the valve (3) is operating, to a minimum pressure (P22) which is the pressure to which the valve (22) is set, when the load carriage reaches its highest point on the mast.
GB3046871A 1970-07-01 1971-06-29 Lift truck Expired GB1342407A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9101/70A SE344053B (en) 1970-07-01 1970-07-01

Publications (1)

Publication Number Publication Date
GB1342407A true GB1342407A (en) 1974-01-03

Family

ID=20275844

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3046871A Expired GB1342407A (en) 1970-07-01 1971-06-29 Lift truck

Country Status (4)

Country Link
US (1) US3774726A (en)
DE (1) DE2132842A1 (en)
GB (1) GB1342407A (en)
SE (1) SE344053B (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005850A (en) * 1974-04-08 1977-02-01 Goodbary Engineering Co. Floor jack
US4202175A (en) * 1977-05-13 1980-05-13 Hale Frank L Hydraulic control system for a dump truck
US4163412A (en) * 1977-10-03 1979-08-07 Towmotor Corporation Fluid cylinder control with precision stop action
US4280397A (en) * 1978-04-27 1981-07-28 Joy Manufacturing Company Hydraulic fluid control apparatus
FR2521543B1 (en) * 1982-02-12 1986-02-21 Manitou Bf AUTOMATIC LOAD-BASED SAFETY DEVICE FOR A LIFT TRUCK
US4458785A (en) * 1982-10-25 1984-07-10 Bushnell Jr Sherman W Lift
US4713936A (en) * 1985-11-18 1987-12-22 Deere & Company Motor seal protector valve
DE4021984A1 (en) * 1990-07-11 1992-01-16 Steinbock Boss Gmbh LOAD RECEIVING VEHICLE WITH TIP LOCK
US5890562A (en) * 1996-08-16 1999-04-06 Bt Prime Mover, Inc. Control console for material handling vehicle
DE19919655B4 (en) * 1999-04-29 2004-08-26 Jungheinrich Ag Industrial truck with anti-tip device
US7823698B2 (en) * 2007-08-01 2010-11-02 Wiggins Light Co., Inc. Three stage mast
US8777545B2 (en) * 2009-10-20 2014-07-15 Bright Coop, Inc. Free lift mast for truck mounted forklift
US10160628B2 (en) * 2016-03-24 2018-12-25 Toyota Motor Engineering & Manufacturing North America, Inc. Pneumatic lifting device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125856A (en) * 1964-03-24 Variable-pressure hydraulic control system
US2751994A (en) * 1950-02-08 1956-06-26 Baker Raulang Co Load limit mechanism
US2810930A (en) * 1950-10-06 1957-10-29 Mortimer D Macdonald Press having thickness control means
US3307656A (en) * 1965-10-22 1967-03-07 Clark Equipment Co Hydraulic system for lift trucks and the like
US3542161A (en) * 1968-08-23 1970-11-24 Eaton Yale & Towne Load height indicator for industrial trucks

Also Published As

Publication number Publication date
SE344053B (en) 1972-03-27
US3774726A (en) 1973-11-27
DE2132842A1 (en) 1972-01-05

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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