US3868034A - Industrial lift trucks - Google Patents

Industrial lift trucks Download PDF

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Publication number
US3868034A
US3868034A US357383A US35738373A US3868034A US 3868034 A US3868034 A US 3868034A US 357383 A US357383 A US 357383A US 35738373 A US35738373 A US 35738373A US 3868034 A US3868034 A US 3868034A
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US
United States
Prior art keywords
motor
turret head
callipers
solenoid
brake assembly
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
US357383A
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English (en)
Inventor
Cecil Goodacre
Peter Alfred Leggett
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 Material Handling UK Ltd
Original Assignee
Lansing Bagnall 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 Lansing Bagnall Ltd filed Critical Lansing Bagnall Ltd
Application granted granted Critical
Publication of US3868034A publication Critical patent/US3868034A/en
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Expired - Lifetime legal-status Critical Current

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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
    • B66F9/12—Platforms; Forks; Other load supporting or gripping members
    • B66F9/14—Platforms; Forks; Other load supporting or gripping members laterally movable, e.g. swingable, for slewing or transverse movements
    • B66F9/147—Whole unit including fork support moves relative to mast

Definitions

  • the invention relates to industrial lift trucks of the kind comprising a load lifting carriage movable up and down a mast structure mounted on the truck, a turret head mounted on the load lifting carriage for sideways movement relatively thereto, a load supporting structure mounted on the turret head for rotation relatively thereto about an upright axis, and an electric motor mounted on the turret head to effect rotation of the load supporting structure.
  • the load supporting structure should be capable of being retained in any position to which it is rotated.
  • the effect can be achieved by arranging for the drive to be transmitted through a non-reversible gear system.
  • the gear system may incorporate a worm gear.
  • such an arrangement suffers from the disadvantage that if the load lifting structure is forcibly moved by an externally applied force, (for example by the truck hitting an obstruction) severe damage to the gear system can result.
  • the electric motor is drivably connected to the load supporting structure through a reversible transmission, there being provided a releasable frictional brake assembly which normally engages a member rotatable with the transmission so as to restrain it against movement, and wherein means controlling the electric motor are coupled with means controlling the brake assembly in such a manner that operation of the first said means to operate the motor also causes the second said means to effect release of the brake assembly.
  • a further electric motor driving a further reversible transmission to effect sideways movement of the turret head on the load lifting carriage
  • a further releasable frictional brake assembly which normally engages a member rotatable with said further transmission so as to restrain it against movement
  • means controlling the further electric motor are coupled with means controlling the brake assembly in such manner that operation of the first said means to operate the motor also causes the second said means to effect release of the brake assembly.
  • the reversible transmission may comprise a reversible gear train.
  • Release of the brake assembly may be effected by an electrically operated solenoid, and a switch controlling the solenoid may be coupled with a switch controlling the electric motor so that both switches operate simultaneously.
  • spring means are provided to engage the brake assembly, energisation of the solenoid being arranged to disengage the brake assembly against the action of the spring means.
  • the member which the brake assembly engages may be driven directly by the output shaft of the electric motor.
  • the output shaft of the electric motor For example it may be mounted on that shaft.
  • FIG. 1 is a diagrammatic side elevation of an industrial lift truck of the kind to which the invention is applied;
  • FIG. 2 is a plan view of the truck of FIG. 1 in use in conjunction with storage racking;
  • FIG. 3 is a vertical section through the load lifting carriage, turret head, and load supporting structure of the truck of FIGS. 1 and 2;
  • FIG. 4 is a diagrammatic perspective view showing the arrangement of the gear assemblies used in the arrangement of FIG. 3;
  • FIGS. 5 and 6 are diagrammatic plan views of the turret head, load supporting structure and part of the load lifting carriage showing the two alternative positions of the stop device;
  • FIGS. 7 and 8 illustrate respectively an end view and a partly sectioned, partly schematic, view of a brake assembly.
  • the industrial lift truck 10 has an upright mast structure 11 on which a load lifting carriage 12 is movable up and down.
  • a turret head 13 is mounted on the load lifting carriage 12 for sideways movement relatively thereto and a load supporting structure in the form of lifting forks 14 is mounted on the turret head 13 for rotation about an upright axis.
  • FIG. 2 the truck is shown in a narrow aisle between two sets of racking l5 and 16.
  • the truck 10 passes along the aisle and is required to move a load (indicated at 17) into or out of the racking to either side of the truck.
  • a load indicated at 17
  • the turret head 13 it is necessary for the turret head 13 to be narrow in width to ensure the maximum space for the load 17 between the turret head and the opposite racking when the lifting forks 14 are rotated to face sideways.
  • FIGS. 3 and 4 show the coupling system between the turret head and the load lifting carriage which ensures that the turret head remains stable even when it is projecting laterally from the turret head.
  • the load lifting carriage 12 is provided with rollers 19 which engage the upright channels of the mast structure 11 so as to guide the load lifting carriage in its up and down movement on the mast structure.
  • the load lifting carriage 12 has upper and lower plates 20 and 21 respectively which project forwardly of the mast structure and extend across the whole width of the carriage.
  • the upper plate 20 has mounted on its upper surface an upwardly facing channel 22 which receives a roller 23 which is mounted for rotation about a vertical axis on the turret head 13.
  • the underside of the plate 21 has mounted thereon a downwardly facing channel 24 which receives a roller 25 which is also mounted on the turret head.
  • a front plate 26 of the load lifting carriage 12 carries a forwardly projecting channel 27 which receives a roller 28 mounted on the turret head 13 to rotate about a fore and aft extending horizontal axis.
  • Each assembly comprises a vertical shaft 29 which is rotatable in spaced bearings on the turret head 13 and carries on its upper end a pinion 30 and on its lower end a pinion 31.
  • the pinions 30 and 31 are in mesh with horizontal toothed racks 32 and 33 respectively which are mounted on the front plate 26 of the load lifting carriage and which extend across the whole width of the carriage.
  • the upper pinion 30 is in mesh with another pinion 34 which is carried on a stub shaft 35 rotatable in bearings on the turret heat 13.
  • the pinion 34 is in mesh with a further horizontal toothed rack 36 which is opposite to the toothed rack 32 and also extends across the full width of the load lifting carriage 12.
  • each gear assembly comprising the shaft 29, pinions 30, 31 and 34, is duplicated, the two gear assemblies being disposed side by side, so that as the turret head reaches one limit of its sideways movement on the load lifting carriage, one of the gear assemblies can come out of engagement with the racks 32, 33 and 36, so that the turret head can project laterally from the load lifting carriage as shown in chain lines in FIG. 2.'In this case however the other gear assembly remains in contact with the racks and maintains the turret head in a stable condition.
  • the gear assemblies are also used for transmitting a drive to the turret head to move it sideways on the load lifting carriage.
  • An electric motor 37 is mounted vertically on the turret head 13 and is coupled, through a gyral gear box 38 to a gear wheel 39.
  • the gear wheel 39 is in mesh with an idler gear 40 which is in turn in mesh with both of the lower pinions 31 of the two gear assemblies. Actuation of the motor 37 thus rotates the two pinions 31 in the same direction and thus rotates the shafts 29 to propel the turret head sideways due to engagement of the pinions 30 and 31 with the racks 32 and 33 respectively.
  • FIGS. 5 and 6 there is mounted on the turret head 13 a bell crank level 41 mounted for pivoting movement about a vertical axis indicated at 41a.
  • Two elongated stop rods 42 and 43 are mounted on the turret head 13 for reciprocal movement.
  • the stop rods are pivotally connected to the bell crank lever 41 on opposite sides of its axis of pivoting.
  • the lengths of the rods 42 and 43 are such that when the bell crank lever 41 is pivoted anti-clockwise (as shown in FIG. 5) the end of the rod 42 projects into a position where it is engageable with a fixed abutment 44 on the load lifting carriage 12 whereas when the lever 41 is pivoted clockwise (as shown in FIG.
  • the rod 43 is moved to a position where it is engageable with the abutment 44.
  • the relative dispositions of the abutment 44 and the rods 42 and 43 are such that when the rod 43 engages the abutment the edge of the turret head 13 is flush with the edge of the load lifting carriage 12 (as shown in FIG. 6) whereas when the rod 42 is in engagement with the abutment 44 the turret head 13 can move further sideways to a position where it projects laterally from the load lifting carriage 12.
  • the load supporting structure 14 comprises a vertical back plate 45 on which the lifting forks are supported and the bell crank lever 41 is so disposed that it is engaged by an edge of the plate 45 and pivoted clockwise or anti-clockwise depending on the direction in which the forks are turned.
  • the stop arrangement permits the turret head 13 to project laterally beyond the load lifting carriage 12 when the turret head is moving sideways in the same direction as the forks are facing. As mentioned above this permits the forks to be inserted fully into the racking.
  • an abutment similar to the abutment 44 is also disposed at the opposite side of the load lifting carriage.
  • the lengths of the rods 42 and 43 are such that they cannot, at the same time, both be in a position where they will not engage the abutments 44.
  • the load lifting structure 14 be in an intermediate position so that the bell crank lever 41 is free to pivot it is then impossible for the bell crank lever to pivot to a position where both stop rods 42 and 43 are free of engagement with the abutment 44 and would thus permit the turret head 13 to move sideways out of engagement with the load lifting carriage 12.
  • FIG. 3 Part of the bell crank lever 41 and one of the stop rods 43 is shown in FIG. 3 and it will be seen that the stop rods are reciprocable in bearing blocks 46 mounted on the turret head.
  • the load supporting structure 14 is carried on the lower end of a vertical shaft 47 mounted in bearings 48 and 49 on the turret head.
  • the load supporting structure is rotated by an electric motor 50 mounted on the turret head which motor drives the shaft 47 through a gyral gear 51 and gear train 52.
  • the gear train is reversible and thus rotation of the load supporting structure 14 by an external force, for example as a result of striking an obstruction, could permit the structure to rotate.
  • a friction brake assembly which is indicated generally at 53 in FIG. 3 and is shown in more detail in FIGS. 7 and 8.
  • the brake assembly comprises callipers 54, which are engageable with a brake drum 57 mounted on the end of the motor shaft 58, and the callipers 54 are operated by an electric solenoid 55.
  • the callipers 54 have pivots 59 intermediate their ends and each has a shoe 80 which normally engages the brake drum. Between one pair of adjacent ends of the callipers is disposed a compression spring 60.
  • the other ends of the callipers carry respective adjusting screws 61 and 62 which bear on respective balls 63 and 64 which engage opposite sides of a rod 65 which is formed as a toggle, in a brake operating assembly 66.
  • the assembly 66 is carried on a plate 67 which is fixed to the casing 68 of the motor in a plane normal to the axis of the shaft 58.
  • the solenoid 55 is secured to this plate to be alongside the motor.
  • the solenoid has an armature 69 pivoted to a lever 70 which bears against the plate 67 on the side thereof opposite the side on which the body of the solenoid is carried.
  • the free end of the lever 70 bears on one end of a slot 71 in the rod 65.
  • the end of the rod 65 further from the balls 63 and 64 carries an extension 72 which extends alongside the body of the solenoid.
  • a compression spring 73 is disposed between a head 74 of the extension 72 and the plate 67.
  • the rod 65 is carried in a sleeve 75 which has aligned lateral apertures 76 and 77 in which the balls 63 and 64 are mounted.
  • the brake is normally engaged in this condition the balls 63 and 64 are maintained on the outward taper 178 of the rod 65 and the callipers force the shoes onto the brake drum against the action of the spring 60.
  • the spring 73 biases the rod 65 into the normal position for effecting engagement of the brake.
  • the brake is released by the solenoid, which, when energised, pulls in the armature 69 and thereby causes the rod 65 to move against the action of the spring 73 and to allow the balls 63 and 64 to move inwardly. This movement allows the spring 60 to move the callipers 54 and their shoes away from the brake drum.
  • the electric switch 79 controlling the supply of power to the motor 50 (shown schematically in FIG.
  • a similar brake assembly indicated generally at 56 is associated with aforementioned motor 57 which effects side shifting movement of the turret head on the load lifting carriage. This again serves as a safety overload device.
  • the use of electric motors for shifting the turret head sideways and rotating the load lifting structure means that the operation of the whole assembly can radially be made wholly or partly automatic in operation. For example it may be required to rotate a load while the truck is in an aisle between two sets of racking. It will be appreciated that to achieve this it is necessary to effect simultaneous sideways movement of the turret head 13 and rotation of the load supporting structure 14 and to this end there may readily be provided a control system controlling the motors 37 and 40 so that they operate in coordination to match the speed of sideways movement of the turret head 13 with the speed of rotation of the structure 14.
  • An industrial lift truck comprising:
  • a turret head mounted on said load lifting carriage for sideways movement relative thereto;
  • a load supporting structure mounted on said turret head for rotation relative thereto about an upright axis;
  • a releasable frictional brake assembly comprising a pair of brake callipers, and spring means for biasing said callipers into braking engagement with a cylindrical member which is rotatable with said transmission so as to restrain it against movement;
  • said means comprising an electrically operated solenoid, and a switch controlling the operation of said solenoid, said switch being coupled for simultaneous operation with said firstmentioned switch controlling said motor, so that operation of said solenoid produces movement of said callipers out of braking engagement with said member against the action of said spring means when said motor is operated, whereby the brake assembly is selectively operable to hold said load supporting structure in any desired position, including three working positions whereat said load supporting structure is directed forwardly or to either side, further said brake callipers serving as an overload device to permit frictional rotation of said cylindrical member if sufficient external force is applied to said cylindrical member.
  • An industrial lift truck according to claim 1 comprising:
  • said further motor being drivably connected to said lifting carriage to effect sideways movement of said turret head with respect thereto through said further transmission;
  • a further releasable friction brake assembly comprising a further pair of callipers, and further spring means for biasing said further callipers into braking engagement with a further member which is rotatable with said further transmission so as to restrain it against movement;

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Warehouses Or Storage Devices (AREA)
US357383A 1972-05-08 1973-05-04 Industrial lift trucks Expired - Lifetime US3868034A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2144372A GB1395915A (en) 1972-05-08 1972-05-08 Industrial lift trucks

Publications (1)

Publication Number Publication Date
US3868034A true US3868034A (en) 1975-02-25

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Application Number Title Priority Date Filing Date
US357383A Expired - Lifetime US3868034A (en) 1972-05-08 1973-05-04 Industrial lift trucks

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US (1) US3868034A (US20080094685A1-20080424-C00004.png)
JP (1) JPS4948055A (US20080094685A1-20080424-C00004.png)
CA (1) CA976508A (US20080094685A1-20080424-C00004.png)
CH (1) CH568934A5 (US20080094685A1-20080424-C00004.png)
DE (1) DE2323116A1 (US20080094685A1-20080424-C00004.png)
FR (1) FR2183946B1 (US20080094685A1-20080424-C00004.png)
GB (1) GB1395915A (US20080094685A1-20080424-C00004.png)
NL (1) NL7306399A (US20080094685A1-20080424-C00004.png)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998346A (en) * 1975-02-03 1976-12-21 The Raymond Corporation Material handling apparatus
WO2000024666A1 (en) * 1998-10-28 2000-05-04 Tiger Engineering Pty Ltd Load handling vehicle
US20060054368A1 (en) * 2004-09-16 2006-03-16 Varela Tomaz D Electric drive axle assembly with independent dual motors
US20070023259A1 (en) * 2005-07-29 2007-02-01 Jungheinrich Aktiengesellschaft Three-side stacker
US20100078270A1 (en) * 2008-09-30 2010-04-01 Jon Wagner Automatic System Brake

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2283854A1 (fr) * 1974-09-04 1976-04-02 Eaton Gmbh Dispositif de manutention de charge pour appareils de chargement et de dechargement de casiers avec fourche pivotante
JPS51143255A (en) * 1975-06-02 1976-12-09 Nippon Yusoki Co Ltd Lift truck
GB1593500A (en) * 1977-03-30 1981-07-15 Narrow Aisle Uk Ltd Industrial lift truck
JPS57135598U (US20080094685A1-20080424-C00004.png) * 1981-02-13 1982-08-24
JPS57188798U (US20080094685A1-20080424-C00004.png) * 1981-05-25 1982-11-30
JPS5812599U (ja) * 1981-07-17 1983-01-26 小松フオ−クリフト株式会社 荷役自動車のサイドシフト装置
JPH0729173Y2 (ja) * 1987-02-04 1995-07-05 ワイケイケイ株式会社 建具の換気用框
JPH0522559Y2 (US20080094685A1-20080424-C00004.png) * 1987-03-02 1993-06-10

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2755081A (en) * 1951-10-08 1956-07-17 Johnson Clarence Garage door operators
US2910204A (en) * 1957-07-05 1959-10-27 Clark Equipment Co Industrial lift truck
US3106305A (en) * 1962-08-23 1963-10-08 William F Gehring Industrial fork lift truck
US3420389A (en) * 1966-09-29 1969-01-07 Euclid Crane & Hoist Co The Automatic locking mechanism for a rotary load carrier in a storage system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2755081A (en) * 1951-10-08 1956-07-17 Johnson Clarence Garage door operators
US2910204A (en) * 1957-07-05 1959-10-27 Clark Equipment Co Industrial lift truck
US3106305A (en) * 1962-08-23 1963-10-08 William F Gehring Industrial fork lift truck
US3420389A (en) * 1966-09-29 1969-01-07 Euclid Crane & Hoist Co The Automatic locking mechanism for a rotary load carrier in a storage system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998346A (en) * 1975-02-03 1976-12-21 The Raymond Corporation Material handling apparatus
WO2000024666A1 (en) * 1998-10-28 2000-05-04 Tiger Engineering Pty Ltd Load handling vehicle
US20060054368A1 (en) * 2004-09-16 2006-03-16 Varela Tomaz D Electric drive axle assembly with independent dual motors
US7314105B2 (en) 2004-09-16 2008-01-01 Arvinmeritor Technology, Llc Electric drive axle assembly with independent dual motors
US20070023259A1 (en) * 2005-07-29 2007-02-01 Jungheinrich Aktiengesellschaft Three-side stacker
US20100078270A1 (en) * 2008-09-30 2010-04-01 Jon Wagner Automatic System Brake
US8146718B2 (en) * 2008-09-30 2012-04-03 Agilent Technologies, Inc. Automatic system brake

Also Published As

Publication number Publication date
DE2323116A1 (de) 1973-11-29
JPS4948055A (US20080094685A1-20080424-C00004.png) 1974-05-09
CH568934A5 (US20080094685A1-20080424-C00004.png) 1975-11-14
FR2183946A1 (US20080094685A1-20080424-C00004.png) 1973-12-21
NL7306399A (US20080094685A1-20080424-C00004.png) 1973-11-12
CA976508A (en) 1975-10-21
FR2183946B1 (US20080094685A1-20080424-C00004.png) 1976-09-17
GB1395915A (en) 1975-05-29
AU5541273A (en) 1974-11-14

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