US3894616A - Forklift - Google Patents

Forklift Download PDF

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Publication number
US3894616A
US3894616A US381438A US38143873A US3894616A US 3894616 A US3894616 A US 3894616A US 381438 A US381438 A US 381438A US 38143873 A US38143873 A US 38143873A US 3894616 A US3894616 A US 3894616A
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US
United States
Prior art keywords
sheaves
pair
conduits
carriage
uprights
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
US381438A
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English (en)
Inventor
Kunihisa Kawanishi
Shuji Ohta
Seigo Shimizu
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.)
Toyota Industries Corp
Original Assignee
Toyoda Automatic Loom Works 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 Toyoda Automatic Loom Works Ltd filed Critical Toyoda Automatic Loom Works Ltd
Application granted granted Critical
Publication of US3894616A publication Critical patent/US3894616A/en
Anticipated expiration legal-status Critical
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
    • B66F9/08—Masts; Guides; Chains
    • 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
    • B66F9/205—Arrangements for transmitting pneumatic, hydraulic or electric power to movable parts or devices
    • 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
    • Y10S414/00—Material or article handling
    • Y10S414/131—Transmission-line guide for a shiftable handler

Definitions

  • the sheaves are secured between a pair of brackets carried on the piston rod of the ram, on the extensible uprights within the forklift mass assembly, or on both of these elements. Tie rods adjacent the sheaves in their regions of contact with the conduits prevent these con duits from jumping off the sheaves.
  • the present invention relates to a forklift vehicle and, more particularly, to a fluid conduit arrangement in a forklift truck which supplies pressurized fluid to a fluid-operated attachment which is movable vertically along stationary or movable masts or uprights.
  • fluid conduits are reeved over sheaves rotatably mounted on a cross arm attached to an extensible portion of a fluid motor, usually over sheaves mounted outwardly of adjacent sprockets on the same cross arm, where the operator's visibility is much reduced.
  • fluid conduits run along the outside of the mast where they are susceptible to damage, for instance. due to collision. Increase of the number of sheaves over which conduits are reeved. and frequent changing of feed direction as is sometimes inevitable, are apt to increase friction and interfere with operator visibility.
  • fluid conduits are reeved around several sheaves so that at least one loop is formed to keep the flexible conduits taut.
  • This con siders protection of hoses or the like from the point of view of preventing interference in truck operation because of a tendency for the hoses to be caught in the operating mechanism.
  • little attention is directed to the problem of the hoses being damaged by collision, and none at all to the problem of friction.
  • a triple-stage telescopic upright structure affords excellent operator visibility through the structure by a good chain arrangement but does not solve the problem of hose arrangement.
  • An apparatus for reeving conduits in a triple-section extensible mast, especially having a device for compensating for the change in length of the fluid conduits when pressurized fluid is supplied. This improves the operators visibility and prevents damage to the conduit arrangement; however, these improve ments are of only limited effect because a chain arrangement sometimes impairs the operators visibility and the conduits are sometimes arranged on the outsides of the mast members where they are accessible for servicing but liable to be damaged.
  • Another object is the provision of a forklift having a fluid-operated attachment on the vertically displaceable carriage and improved visibility.
  • a further object is to provide such a forklift wherein the fluid conduits for the attachment are protected from harm.
  • the fluid conduits are arranged close to a plane which is the longitudinal center-line plane of the lift truck and substantially within the longitudinal projection of the lift cylinder. which is substantially a dead zone for operator visibility.
  • FIG. I is a perspective view of a lift truck or forklift with the arrangement of fluid conduits according to this invention.
  • FIG. 2 is an enlarged perspective view of the upper part of FIG. I. showing a typical arrangement of the fluid conduits reeved over a pair of sheaves at the top of an extensible piston rod of a fluid cylinder:
  • FIG. 3 is a front elevation of FIG. 2;
  • FIG. 4 is a cross section along line IV IV of FIG.
  • FIG. 5 is a cross section along line V V of FIG. 3;
  • FIG. 6 is a perspective exploded view of a pair of brackets which accommodate a pair of sheaves. a pair of pins and a pair of bars.
  • FIG. 7 is a perspective view of a clip for keeping fluid conduits parallel side-by-side.
  • FIG. 8 is an enlarged perspective view of another embodiment similar to FIG. 2.
  • FIG. 1 shows a lift truck or forklift of substantially conventional construction having a body portion T, an
  • a mast assembly M comprising stationary uprights I and extensible uprights 3 and a carriage C movable vertically along the mast assembly M.
  • the mast assembly M comprises a pair of spaced-apart C-section channels I which are vertical and connected together by a plurality of horizontal cross braces 2 to form a rigid and substantially fixed unitary structure.
  • An inner slide or mast has a pair of spaced-apart generally I-section channels 3 which are vertical and connected together by a plurality of horizontal cross braces 4, the beams 3 being cut-off at one flange.
  • a fluid cylinder 5 is mounted centrally between the two channels 1 of the mast M parallel thereto and fastened to the mast at the bottom as is known.
  • An upwardly extensible piston rod 6 of the ram 5 carries on its upper end a cross-arm or a sprocketwheel support 7 which rotatably supports a pair of sprocket-wheels 8 to either side of its support 7.
  • a pair of chains 9 which are fastened at their one ends to a flange 5a integral with the cylinder 5 and at their other ends of the carriage C. pass over the wheels 8.
  • the brackets II are fastened together by tie bars 17 and 18 having nuts 17a and 18a.
  • a pair of sheaves or pulleys 12 I3 are rotatable on horizontal pins 14 and I5 secured in the parallel and spaced brackets II.
  • the sheaves are positioned above the fluid motor 5 and are horizontally spaced apart in the longitudinal direction of the truck that is the normal direction of travel of the truck indicated by arrow A.
  • a plurality of fluid conduits [6 are reeved in parallel over the sheaves l2 and 13.
  • the conduits 16 are disposed to the front and rear of the cylinder 5, substantially within the longitudinal projection of this fluid cylinder where the operators visual angle a is blocked in any case. In this manner the operators visibility is not sacrificed. Such improved visibility for the operator contributes to efficiency and safety of operation.
  • These conduits 16 are inextensible hydraulic hoses which are connected to attachments such as a clamp cylinder on carriage C.
  • the fluid conduits 16 are banded together in parallel alignment by a clip I9 (shown in FIG. 7) which is made of elastic sheet steel or synthetic resin in such a fashion as to be easily snapped in and out of the three conduits l6 and is able to pass over sheaves of relatively small diameter.
  • the function of the clip I9 is to prevent the conduits from misaligning or moving due to vibration.
  • the tie bars 17 and I8 not only connect the brackets 11 together but also prevent the conduits I6 from running out of grooves of the sheaves l2 and I3.
  • the bolts 10 may be utilized as guide bars for the sprocket-wheel support 7 in case free lift" is required. This is achieved by reducing the height of the brackets II, or by adopting the embodiments described below.
  • the bracket assembly including the sheaves 12. I3 can be mounted on the sprocket-wheel support 7 without any connection with the cross-brace 4 or can be hung from the cross-brace 4 without any connection with the support 7. In either embodiment the fluid conduits are reeved over a plurality of sheaves or pulleys supported above the fluid motor.
  • the arrangement of a pair of sheaves 12, I3 spaced apart in the longitudinal direction can reduce or minimize the respective contact-angles 0 of 60 and 6 of I20 between conduits and sheaves, compared with conventional arrangements of fluid conduits, and also enables the conduits each to run in a respective plane parallel to the vertically longitudinal center-line plane P of the truck. i.e.. with minimal change of direction.
  • Such reduced or minimized contact-angles and minimal directional change reduce friction between fluid conduits and contacting guides therefor. such as sheaves.
  • the fluid-conduit arrangement concentrated close to the vertically longitudinal center-line plane P, prevents the fluid conduits from being damaged by collision, making it much safer when compared with a conventional arrangement of conduits running on exposed surfaces of the mast. Such an arrangement also prevents interference with the operation of the truck by being caught in the operating mechanism.
  • Improved visibility in accordance with the present invention allows a lift truck to have a narrower mast structure which is suitable for operation in narrower space.
  • FIG. 8 Another embodiment of the present invention is shown in FIG. 8 where five conduits including two additional conduits are used.
  • Three conduits 16 pass over a pair of sheaves I2, I3 between the brackets ll, 11 and two conduits I6 pass over an additional pair of sheaves 12', I3. rotatably mounted on extensions l4'l5' of the pins 14, 15 respectively.
  • the tie rods 17, I8 are provided with extensions I7, 18 to protect the additional conduits from running out of the sheaves l2, 13', with suitable flanges l7", 18" mounted thereon preventing the extra conduits 16' from slipping offv
  • the present invention can provide a lift truck comprising an improved arrangement of fluid conduits which affords better operator visibility, less susceptibility to damage, and less friction.
  • a forklift comprising:
  • a body adapted to travel along the ground in a normal travel direction
  • a mast assembly on said body including a pair of relatively fixed uprights and a pair of movable uprights vertically displaceable on said fixed uprights;
  • a pair of sheaves journaled on said brackets including a forwardly disposed sheave and a rearwardly disposed sheave. at least one of said sheaves lying in the vertical projection of said piston rod and directly over said piston rod while being spaced below said cross-brace;

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Forklifts And Lifting Vehicles (AREA)
US381438A 1972-07-25 1973-07-23 Forklift Expired - Lifetime US3894616A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7427372A JPS5326384B2 (fr) 1972-07-25 1972-07-25

Publications (1)

Publication Number Publication Date
US3894616A true US3894616A (en) 1975-07-15

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ID=13542331

Family Applications (1)

Application Number Title Priority Date Filing Date
US381438A Expired - Lifetime US3894616A (en) 1972-07-25 1973-07-23 Forklift

Country Status (3)

Country Link
US (1) US3894616A (fr)
JP (1) JPS5326384B2 (fr)
DE (1) DE2335287A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4470229A (en) * 1981-04-14 1984-09-11 Coles Cranes Limited Telescopic booms for cranes, access or load platforms or the like
US4493397A (en) * 1982-08-06 1985-01-15 Nissan Industrial Equipment Co. Fork lift trucks
US4621711A (en) * 1983-12-16 1986-11-11 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Pressure oil line system for a fork lift truck
US4683987A (en) * 1984-11-12 1987-08-04 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Hydraulic power piping unit for a lift truck
US5992571A (en) * 1995-12-30 1999-11-30 Daewoo Heavy Industries Ltd. Mast assembly for forklift trucks
EP1151959A1 (fr) * 2000-05-04 2001-11-07 Rocla Oyj Chariot élévateur avec un mât extensible
US20050037880A1 (en) * 2003-08-04 2005-02-17 Masashige Yoshikawa Hydraulic pipe mechanism for industrial vehicle
US20070012520A1 (en) * 2005-07-15 2007-01-18 Hirohito Hayashi Lift device for industrial vehicle
US20110091306A1 (en) * 2009-10-20 2011-04-21 Francois Roux Free lift mast for truck mounted forklift
US20150158707A1 (en) * 2013-12-11 2015-06-11 Nacco Materials Handling Group, Inc. Hose Header For A Lift Truck Mast
CN105073625A (zh) * 2013-01-31 2015-11-18 永恒力股份公司 用于地面运输车辆的具有转向轮装置的升降缸
US20150353332A1 (en) * 2014-06-04 2015-12-10 Jungheinrich Aktiengesellschaft Lift frame for an industrial truck
US10247328B2 (en) * 2014-04-03 2019-04-02 Igus Gmbh Guide system for supply lines and robot having a guide system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2635774A (en) * 1949-06-23 1953-04-21 Clark Equipment Co Paper roll handling mechanism
US2763390A (en) * 1952-11-12 1956-09-18 Fred J Vandemark Company Clamp and rotating mechanism for industrial trucks
US2826323A (en) * 1954-09-21 1958-03-11 Otis Elevator Co Crate handling attachment for industrial trucks
US2836317A (en) * 1956-09-10 1958-05-27 Oury John Foster Brick handling apparatus
US2883003A (en) * 1954-12-24 1959-04-21 Emmanuel Kaye Mast lift trucks
US2979162A (en) * 1957-01-28 1961-04-11 Yale & Towne Mfg Co Upright assembly for industrial trucks
US3481498A (en) * 1967-06-12 1969-12-02 Clark Equipment Co Apparatus for reeving conduits in a triple section extendible mast

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2635774A (en) * 1949-06-23 1953-04-21 Clark Equipment Co Paper roll handling mechanism
US2763390A (en) * 1952-11-12 1956-09-18 Fred J Vandemark Company Clamp and rotating mechanism for industrial trucks
US2826323A (en) * 1954-09-21 1958-03-11 Otis Elevator Co Crate handling attachment for industrial trucks
US2883003A (en) * 1954-12-24 1959-04-21 Emmanuel Kaye Mast lift trucks
US2836317A (en) * 1956-09-10 1958-05-27 Oury John Foster Brick handling apparatus
US2979162A (en) * 1957-01-28 1961-04-11 Yale & Towne Mfg Co Upright assembly for industrial trucks
US3481498A (en) * 1967-06-12 1969-12-02 Clark Equipment Co Apparatus for reeving conduits in a triple section extendible mast

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4470229A (en) * 1981-04-14 1984-09-11 Coles Cranes Limited Telescopic booms for cranes, access or load platforms or the like
US4493397A (en) * 1982-08-06 1985-01-15 Nissan Industrial Equipment Co. Fork lift trucks
US4621711A (en) * 1983-12-16 1986-11-11 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Pressure oil line system for a fork lift truck
US4683987A (en) * 1984-11-12 1987-08-04 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Hydraulic power piping unit for a lift truck
US5992571A (en) * 1995-12-30 1999-11-30 Daewoo Heavy Industries Ltd. Mast assembly for forklift trucks
EP1151959A1 (fr) * 2000-05-04 2001-11-07 Rocla Oyj Chariot élévateur avec un mât extensible
US20050037880A1 (en) * 2003-08-04 2005-02-17 Masashige Yoshikawa Hydraulic pipe mechanism for industrial vehicle
US7410435B2 (en) * 2003-08-04 2008-08-12 Kabushiki Kaisha Toyota Jidoshokki Hydraulic pipe mechanism for industrial vehicle
US20070012520A1 (en) * 2005-07-15 2007-01-18 Hirohito Hayashi Lift device for industrial vehicle
US7395901B2 (en) * 2005-07-15 2008-07-08 Kabushiki Kaisha Toyota Jidoshokki Lift device for industrial vehicle
US20110091306A1 (en) * 2009-10-20 2011-04-21 Francois Roux Free lift mast for truck mounted forklift
US8777545B2 (en) 2009-10-20 2014-07-15 Bright Coop, Inc. Free lift mast for truck mounted forklift
CN105073625A (zh) * 2013-01-31 2015-11-18 永恒力股份公司 用于地面运输车辆的具有转向轮装置的升降缸
US20150360922A1 (en) * 2013-01-31 2015-12-17 Jungheinrich Aktiengesellschaft Lift cylinder comprising a deflection roller device for an industrial truck
US9611129B2 (en) * 2013-01-31 2017-04-04 Jungheinrich Aktiengesellschaft Lift cylinder comprising a deflection roller device for an industrial truck
US20150158707A1 (en) * 2013-12-11 2015-06-11 Nacco Materials Handling Group, Inc. Hose Header For A Lift Truck Mast
CN104709850A (zh) * 2013-12-11 2015-06-17 纳科物料装卸集团有限公司 用于叉车桅杆的软管头部
US10247328B2 (en) * 2014-04-03 2019-04-02 Igus Gmbh Guide system for supply lines and robot having a guide system
US20150353332A1 (en) * 2014-06-04 2015-12-10 Jungheinrich Aktiengesellschaft Lift frame for an industrial truck
US9527711B2 (en) * 2014-06-04 2016-12-27 Jungheinrich Aktiengesellschaft Lift frame for an industrial truck

Also Published As

Publication number Publication date
JPS5326384B2 (fr) 1978-08-02
DE2335287A1 (de) 1974-02-14
JPS4931053A (fr) 1974-03-20

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