GB2293364A - Industrial Lift Truck - Google Patents

Industrial Lift Truck Download PDF

Info

Publication number
GB2293364A
GB2293364A GB9519322A GB9519322A GB2293364A GB 2293364 A GB2293364 A GB 2293364A GB 9519322 A GB9519322 A GB 9519322A GB 9519322 A GB9519322 A GB 9519322A GB 2293364 A GB2293364 A GB 2293364A
Authority
GB
United Kingdom
Prior art keywords
brake
industrial truck
braking torque
accumulator brake
lift truck
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.)
Granted
Application number
GB9519322A
Other versions
GB2293364B (en
GB9519322D0 (en
Inventor
Rudolf Hendrich
Franz Wind
Ulrich Jochem
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.)
Linde GmbH
Original Assignee
Linde GmbH
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 Linde GmbH filed Critical Linde GmbH
Publication of GB9519322D0 publication Critical patent/GB9519322D0/en
Publication of GB2293364A publication Critical patent/GB2293364A/en
Application granted granted Critical
Publication of GB2293364B publication Critical patent/GB2293364B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/665—Electrical control in fluid-pressure brake systems the systems being specially adapted for transferring two or more command signals, e.g. railway systems
    • B60T13/667—Electrical control in fluid-pressure brake systems the systems being specially adapted for transferring two or more command signals, e.g. railway systems and combined with electro-magnetic brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/24—Electrodynamic brake systems for vehicles in general with additional mechanical or electromagnetic braking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/748—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on electro-magnetic brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/18—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to vehicle weight or load, e.g. load distribution
    • B60T8/1812—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to vehicle weight or load, e.g. load distribution characterised by the means for pressure reduction
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Regulating Braking Force (AREA)
  • Hydraulic Control Valves For Brake Systems (AREA)

Description

2293364 1 truck having an accumulator hr;Rkp The invention relates to an
industrial truck having an accumulator brake.
In industrial trucks, for example electric lift trucks, the accumulator brake serves, in combination with a so-called deadman's switch, as a safety brake which becomes operative (optionally only after a given delay time has elapsed), when the deadman's switch is not operated, whereupon the braking torque which can be generated by the accumulator brake is then abruptly activated. The accumulator brake is designed so that sufficient braking torque is generated, even under maximum loading of the industrial truck. Due to this design, when operating under no load or low load, the retardation usually takes place in a jerky fashion.
An object of the present invention is to provide an industrial truck of the type mentioned in the introduction, in which smoother retardation is possible.
According to the invention, the braking torque generated by the accumulator brake is dependent on the load condition and/or the elevation height. Therefore, instead of cutting in or cutting out a constant high braking torque, the braking torque is influenced in a controlled manner as a function of the operating parameters of load condition and/or elevation height. It is thereby possible, after the deadman's switch has been released, for the braking torque to be built up and/or limited according to time. Smooth braking is possible even under low load or under no load, the tilting moment of an industrial truck designed in accordance with the invention is reduced and its stability is thereby increased. This is particularly advantageous if the industrial truck is designed as a high-lift truck.
According to an advantageous development of the invention, the accumulator brake can be released 2 electromagnetically and is in operative connection with a control and/or regulating device which constantly influences the braking torque during the operation of the industrial truck and which is connected to a load sensor and/or to an elevation height sensor. The braking torque is thus influenced as a function of the load condition and/or the elevation height by the control and/or regulating device which is connected upstream of an electromagnetically operated device for releasing the accumulator brake.
A spring-loaded brake can be provided as the accumulator brake. According to one embodiment of the invention, it is an advantage if the accumulator brake is in the form of a permanent magnet brake.
Further advantages and details of the invention will be described in more detail with reference to an embodiment illustrated, by way of example, in the accompanying diagrammatic drawings, wherein:
Figure 1 shows a side view of an electric lift truck; Figure 2 shows a plan view of the electric lift truck of Figure 1; and Figure 3 shows an operating diagram of the accumulator brake.
Figures 1 and 2 illustrate an industrial truck according to the invention in the form of an electric lift truck, more precisely an electric platform-type lift truck. The truck has a drive frame 1 and a load frame 2 which can be varied in height relative to the frame 1. At least one electromotively operated drive wheel 3 is mounted on the drive frame 1 and is connected with an accumulator brake (not shown in the drawings). The accumulator brake is released electromagnetically upon actuation of a deadman's switch. Therefore, the vehicle is brought to a standstill in a currentless condition.
Instead of a pedal-type deadman's switch it is also possible to use a deadman's switch in the form of a seat switch. Other suitable systems (for example, a lever or push- 3 button) are possible, which ensure that when the driver leaves the vehicle the accumulator brake closes optionally with a time delay.
In accordance with the invention, the braking torque of the accumulator brake is dependent on the load condition and/or elevation height. The operating method of the accumulator brake is evident from Figure 3. A control and/or regulating device 7, which is in operative connection with the accumulator brake 8, is acted upon in response to signals from a load sensor 5 and/or a elevation height sensor 6. Depending on the magnitude of the load situated on the electric lift truck and depending on the elevation height, a desired value for the braking torque is generated in the control and/or regulating device 7 and the accumulator brake 8, which is normally released when the electric lift truck is moving, is closed to a greater or lesser degree when the deadman's switch is released so that the load-dependent and elevation-height dependent braking torque is operative. In this case it is possible for the control and/or regulating device 7 to limit the effective braking torque. However, the braking torque may also be built up to the maximum possible value, the time lapse being determined by the load condition and/or the elevation height.
4 CLATM 1. An industrial truck having an accumulator brake, wherein the braking torque generated by the accumulator brake is dependent on the load condition and/or the elevation height.

Claims (1)

  1. 2. An industrial truck according to Claim 1, wherein the accumulator brake
    can be released electro-magnetically and is in operative connection with a control and/or regulating device which constantly influences the braking torque during the operation of the industrial truck and which is connected to a load sensor and/or to an elevation height sensor.
    3. An industrial truck according to Claim 2, wherein the accumulator brake is in the form of a permanent magnet brake.
    4. An industrial truck substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
GB9519322A 1994-09-26 1995-09-21 Industrial truck having an accumulator brake Expired - Fee Related GB2293364B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19944434328 DE4434328A1 (en) 1994-09-26 1994-09-26 Industrial truck with a storage brake

Publications (3)

Publication Number Publication Date
GB9519322D0 GB9519322D0 (en) 1995-11-22
GB2293364A true GB2293364A (en) 1996-03-27
GB2293364B GB2293364B (en) 1998-02-11

Family

ID=6529199

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9519322A Expired - Fee Related GB2293364B (en) 1994-09-26 1995-09-21 Industrial truck having an accumulator brake

Country Status (3)

Country Link
DE (1) DE4434328A1 (en)
FR (1) FR2724898B1 (en)
GB (1) GB2293364B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7275794B2 (en) * 2003-04-04 2007-10-02 Jungheinrich Aktiengesellschaft Braking system for a battery powered industrial truck
EP1950171A3 (en) * 2007-01-26 2009-08-05 Kabushiki Kaisha Toyota Jidoshokki Travel control apparatus for industrial vehicle

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19646663B4 (en) * 1996-11-12 2006-08-10 Linde Ag Industrial truck with a braking device
DE19711700A1 (en) * 1997-03-20 1998-10-01 Still & Saxby Sarl Industrial truck with an electric traction machine
DE69816316T2 (en) 1997-09-30 2004-05-27 Crown Equipment Corp., New Bremen INTELLIGENT BRAKE SYSTEM FOR MATERIAL HANDLING VEHICLES
DE19743735B4 (en) * 1997-10-02 2009-08-06 Linde Material Handling Gmbh Truck with a driver's cab for braking such a truck
DE102007004429A1 (en) * 2007-01-24 2008-08-07 Siemens Ag Safety brake with jerk limitation
DE102008011719A1 (en) * 2008-02-28 2009-09-03 Jungheinrich Aktiengesellschaft Braking system for a truck
AU2015318258B2 (en) 2014-09-15 2019-02-14 Crown Equipment Corporation Lift truck with optical load sensing structure
DE102014116176A1 (en) * 2014-11-06 2016-05-12 Jungheinrich Aktiengesellschaft Industrial truck with a standing platform

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1301826A (en) * 1969-05-23 1973-01-04
EP0362517A1 (en) * 1988-10-03 1990-04-11 Jungheinrich Aktiengesellschaft Vehicle brake for a lifting lorry
EP0446421A1 (en) * 1990-03-15 1991-09-18 Jungheinrich Aktiengesellschaft Vehicle brake for a lifting lorry
US5057728A (en) * 1990-11-29 1991-10-15 Crown Equipment Corporation Three step electric brake

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2638944A1 (en) * 1976-08-28 1978-03-02 Zahnradfabrik Friedrichshafen MAGNETIC ACTUATED FRICTION CLUTCH OR BRAKE
CH624744A5 (en) * 1977-07-11 1981-08-14 Ortlinghaus Ag Method for actuating an electromagnetically releasable spring pressure brake
DE3627788A1 (en) * 1986-08-16 1988-02-18 Ortlinghaus Werke Gmbh Slewing brake

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1301826A (en) * 1969-05-23 1973-01-04
EP0362517A1 (en) * 1988-10-03 1990-04-11 Jungheinrich Aktiengesellschaft Vehicle brake for a lifting lorry
EP0446421A1 (en) * 1990-03-15 1991-09-18 Jungheinrich Aktiengesellschaft Vehicle brake for a lifting lorry
US5057728A (en) * 1990-11-29 1991-10-15 Crown Equipment Corporation Three step electric brake

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7275794B2 (en) * 2003-04-04 2007-10-02 Jungheinrich Aktiengesellschaft Braking system for a battery powered industrial truck
EP1950171A3 (en) * 2007-01-26 2009-08-05 Kabushiki Kaisha Toyota Jidoshokki Travel control apparatus for industrial vehicle
US8126618B2 (en) 2007-01-26 2012-02-28 Kabushiki Kaisha Toyota Jidoshokki Travel control apparatus for industrial vehicle

Also Published As

Publication number Publication date
FR2724898A1 (en) 1996-03-29
GB2293364B (en) 1998-02-11
DE4434328A1 (en) 1996-03-28
GB9519322D0 (en) 1995-11-22
FR2724898B1 (en) 1997-12-05

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20020921