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GB1217879A - Improvements in or relating to battery powered masted industrial trucks - Google Patents

Improvements in or relating to battery powered masted industrial trucks

Info

Publication number
GB1217879A
GB1217879A GB4604668A GB4604668A GB1217879A GB 1217879 A GB1217879 A GB 1217879A GB 4604668 A GB4604668 A GB 4604668A GB 4604668 A GB4604668 A GB 4604668A GB 1217879 A GB1217879 A GB 1217879A
Authority
GB
United Kingdom
Prior art keywords
float
mark
space ratio
pulsing
motor
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
GB4604668A
Inventor
David Gurwicz
Albert Everett Sloan
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.)
Sevcon Engineering Ltd
Original Assignee
Sevcon Engineering Ltd
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 Sevcon Engineering Ltd filed Critical Sevcon Engineering Ltd
Priority to GB4604668A priority Critical patent/GB1217879A/en
Publication of GB1217879A publication Critical patent/GB1217879A/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
    • B66F9/24—Electrical devices or systems

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)

Abstract

1,217,879. Control of D.C. motors. SEVCON ENG. Ltd. 26 Sept., 1969 [27 Sept., 1968], No. 46046/68. Heading H2J. A float is disposed in a reservoir tank of a battery-powered industrial truck, the tank providing a source of hydraulic fluid for a mastextending ram. Fluid is supplied to the ram by a pump driven by a D.C. motor which is energized from the battery in dependance of the mark-space ratio of a pulsing controller. Movement of the float varies the mark-space ratio to limit the motor speed thereby achieving an optimum tilt speed for the height of the load. The float movement is also employed to vary the mark-space ratio of a pulsing controller for the traction motor. When the mast is being extended, the float falls to increase the resistance of associated potentiometers and to reduce the frequency of firing pulses for thyristors forming part of the pulsing controllers. The motors may be of the series or shunt types and adapted for field or armature control. A modification employs variable pulse-width controllers having main and commutating thrysistors.
GB4604668A 1968-09-27 1968-09-27 Improvements in or relating to battery powered masted industrial trucks Expired GB1217879A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4604668A GB1217879A (en) 1968-09-27 1968-09-27 Improvements in or relating to battery powered masted industrial trucks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4604668A GB1217879A (en) 1968-09-27 1968-09-27 Improvements in or relating to battery powered masted industrial trucks

Publications (1)

Publication Number Publication Date
GB1217879A true GB1217879A (en) 1970-12-31

Family

ID=10439632

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4604668A Expired GB1217879A (en) 1968-09-27 1968-09-27 Improvements in or relating to battery powered masted industrial trucks

Country Status (1)

Country Link
GB (1) GB1217879A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4102132A (en) * 1977-03-22 1978-07-25 Towmotor Corporation Motor control
DE3025975A1 (en) * 1979-07-16 1981-02-12 Crown Controls Corp LIFTING VEHICLE WITH A SPEED CONTROL
EP1669320B2 (en) † 2004-12-10 2012-09-05 Still Sas Floor conveyor comprising a liftable device for picking up loads

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4102132A (en) * 1977-03-22 1978-07-25 Towmotor Corporation Motor control
DE3025975A1 (en) * 1979-07-16 1981-02-12 Crown Controls Corp LIFTING VEHICLE WITH A SPEED CONTROL
EP1669320B2 (en) † 2004-12-10 2012-09-05 Still Sas Floor conveyor comprising a liftable device for picking up loads

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