EP0050119B1 - Schlittenanordnung für einen Gabelstapler mit seitenverschieblich einstellbaren Gabelzinken - Google Patents

Schlittenanordnung für einen Gabelstapler mit seitenverschieblich einstellbaren Gabelzinken Download PDF

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Publication number
EP0050119B1
EP0050119B1 EP81900671A EP81900671A EP0050119B1 EP 0050119 B1 EP0050119 B1 EP 0050119B1 EP 81900671 A EP81900671 A EP 81900671A EP 81900671 A EP81900671 A EP 81900671A EP 0050119 B1 EP0050119 B1 EP 0050119B1
Authority
EP
European Patent Office
Prior art keywords
carriage
fork
forks
cylinder
assembly according
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
EP81900671A
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English (en)
French (fr)
Other versions
EP0050119A4 (de
EP0050119A1 (de
Inventor
Jerry L. Reeves
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.)
Caterpillar Industrial Inc
Original Assignee
Towmotor Corp
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 Towmotor Corp filed Critical Towmotor Corp
Publication of EP0050119A1 publication Critical patent/EP0050119A1/de
Publication of EP0050119A4 publication Critical patent/EP0050119A4/de
Application granted granted Critical
Publication of EP0050119B1 publication Critical patent/EP0050119B1/de
Expired 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
    • B66F9/142—Movements of forks either individually or relative to each other
    • B66F9/144—Movements of forks relative to each other - independent

Definitions

  • This invention relates generally to load carrying apparatus and more particularly to a fork lift carriage assembly having side shift adjustable forks.
  • Material handling vehicles such as fork lift trucks are used to pick up and deliver loads between stations.
  • the fork lift truck typically has a mast which supports a carriage assembly that can be raised along the mast.
  • the carriage normally carries a pair of forks which are maneuverable beneath the load prior to lifting the load.
  • the forks may not be properly aligned with the load to be maneuvered under it. Rather than maneuvering the entire truck, it may be preferable to reposition the forks along the carriage. Under certain loading conditions, it may be necessary that the pair of forks be on the same side of the centerline of the carriage.
  • the carriage In one type of carriage and fork arrangement, the carriage is fixed on the mast against latural displacement.
  • the forks are releasably secured by pins in notches on the top edge of the carriage and can be laterally displaced along the carriage by removing the pins and manually positioning them into other notches.
  • One problem is that the forks, being heavy and cumbersome, may require significant manual exertion in repositioning them along the carriage.
  • the forks can be hydraulically laterally displaced in relation to the centerline.
  • the carriage includes a main carriage which is fixed on the mast against a lateral displacement and a sub-carriage which is movable laterally along the main carriage.
  • the forks are mounted on the sub-carriage and hydraulic cylinders are connected to the sub-carriage to shift it laterally along the main carriage.
  • One problem with this arrangement is that the sub-carriage cannot be shifted laterally so as to position both forks on one side of the centerline.
  • the member which is shiftable to laterally displace the forks i.e., the sub-carriage
  • the sub-carriage is a member that supports the forks and hence the load being carried by the forks. Consequently, for a given load carrying capacity, this sub-carriage must be of a heavyweight construction. This adds to the overall weight of the mast assembly, which reduces the actual carrying capacity of the lift truck. Also, because of the sub-carriage, the forks and hence the load are positioned further away from the front wheels of the truck, which undesirably increases the load movement constant.
  • the cylinder rods of the cylinders are rigidly connected to the members that are shifted to laterally displace the forks. Should, for example, an undue side impact load act on the carriage or forks, this can be transmitted to the rods and bend or otherwise damage them.
  • DE - A-2726147 discloses a fork lift carriage assembly comprising a carriage with upper and lower horizontal rails, and a pair of vertical side members; two forks which are movable horizontally to and fro across the carriage on the rails; and two cylinder means each of which acts between a respective one of the side members and the respective one of the forks which is nearer to the other of the side members, for moving that fork across the carriage.
  • Such an assembly is hereinafter referred to as of the kind described.
  • the forks are always movable to the same extent in the same or opposite directions and cannot be moved to the same side of the centerline of the carriage.
  • US-A-2270664 discloses a fork lift carriage assembly in which the two forks are adjustable along the cylinder of a common double acting cylinder means. In this construction the forks cannot both be moved apart to the fully out position.
  • a fork lift carriage assembly of the kind described is characterised in that each of the cylinder means is operable independently of the other cylinder means and is provided with means for coupling that cylinder means to the respective fork selectively at one of two locations offset from one another in the direction of fork movement, whereby the full stroke of the cylinder means may either cause the respective fork to move between a position adjacent to one side member of the carriage and a centerline of the carriage or between a position spaced from the one side member of the carriage and a position beyond the centerline of the carriage
  • the coupling means of the present invention which permit hydraulic shifting of both forks to such one side. Since the forks are supported on the rails which carry the load, the coupling means can be of a lightweight construction.
  • Fig. 1 shows a fork lift carriage assembly 10 including a carriage 12 that is vertically movable along a mast 14 and a pair of forks 16, 18 which are supported on the carriage 12.
  • the carriage 12 has a pair of roller brackets 20, 22 which support carriage rollers (not shown) that roll along the mast 14 in a conventional manner for moving the carriage 12 between spaced apart elevated positions on the mast 14.
  • Carriage 12 also includes upper horizontal rails 14, lower horizontal rails 26, a side vertical member 28 and a side vertical member 30.
  • Fork 16 is slidably supported on upper rails 24 and lower rails 26, while fork 18 also is slidably supported on upper rails 24 and lower rails 26.
  • a cylinder means 32 is used to shift the fork 18 laterally and a cylinder means 34 is used to shift the fork 16 laterally along the rails 24 and rails 26.
  • Cylinder means 32 includes an outer jacket 36 which is fixed to the vertical member 28 and a movable cylinder rod 38.
  • Cylinder means 34 includes an outer jacket 40 that is fixed to the vertical member 30 and a movable cylinder rod 42.
  • a means 44 couples the cylinder means 32, particularly the rod 38, to the fork 18 to permit the fork 18 to be positioned on either side of the centerline (see Fig. 2) of the carriage 12.
  • a means 46 couples the cylinder means 34, particularly the rod 42, to the fork 16 to permit the fork 16 to be positioned at either side of the centerline.
  • the cylinder means 32 and cylinder means 44 can be independently actuated to position the fork 16 and the fork 18 at a variety of lateral positions along the carriage 12, including positioning both forks 16, 18 simultaneously on one side or the other side of the centerline.
  • the coupling means 44 includes an upper L-shaped track 48 and a lower L-shaped track 50 which are fixed to the rear of the fork 18.
  • the upper track 48 has a single slot 52.
  • a bar 54 has a pair of spaced-apart notches 56, 58 at its upper surface and is slidable along the tracks 48, 50 to align either notch 56 or notch 58 with the slot 52.
  • notch 56 and notch 58 can be spaced-apart by 12 inches.
  • a lock pin 60 is removably retained in either notch 56 or notch 58 and slot 52. When pin 60 is removed, the bar 54 can slide relative to the fixed tracks 48, 50, and hence relative to the fork 18, whereas when the pin 60 is inserted as shown, the bar 54, tracks 48, 50 and hence the fork 18 will move together.
  • the rod 38 of the cylinder means 32 is connected to the bar 54 by a pin 62 which is supported on a bearing 63.
  • a shearable retaining ring 64 which is a snap ring, holds the pin 62 in the position shown.
  • the retaining ring 64 can be, for example, an elastomeric, e.g. rubber O-ring.
  • the pin 60 is T-shaped and has an internal bore 66.
  • a small, spring biased ball 68 is supported in the bore 66 to be biased against a surface 70 of notch 56 (or notch 58) of the bar 54 to help retain the pin 60 in the position shown.
  • the ball 68 will move against this bias into the bore 66 when removing the pin 60 from the position shown.
  • the coupling means 46 is substantially the same as the coupling means 44, as can be appreciated from Figs. 2-4.
  • the corresponding structure of the coupling means 44 and coupling means 46 is shown by the similar reference numerals, so that, for example, bar 54 of means 44 and bar 54' of means 46 are similar components.
  • the fork lift carriage assembly 10 can be con- necte,d to a conventional fork lift truck in a well-known manner to pick up and deliver loads between various stations.
  • fork 16 and fork 18 are adjacent one another at the centerline of the carriage 12, which is termed a full-in position.
  • fork 18 can be moved from the full-in position at the centerline to a position adjacent the vertical member 30, which is termed a full-out position, as shown in phantom lines.
  • cylinder means 34 can be actuated to move the fork 16 from the full-in position at the centerline to a full-out position adjacent the vertical member 28.
  • the carriage 12 is moved to the lower most position on the mast 14 with the fork 16 and fork 18 being adjacent the ground. Then, the pin 60 is manually removed from the notch 56 and slot 52.
  • the cylinder means 32 is actuated to hydraulically move the rod 38 from the full line position shown to the phantom line position.
  • the bar 54 also will be moved or slid along the tracks 48, 50 in relation to the fork 18 to align the notch 58 with the slot 52.
  • the pin 60 is placed in the notch 58 and slot 52. Note from Fig. 3 that the fork 18 as well as the fork 16 are still adjacent the centerline of the carriage 12 at the full-in position.
  • the lift truck operator can hydraulically actuate the cylinder means 34 to move the fork 16 from the full-in position to the full-out position adjacent the vertical member 28.
  • the cylinder means 32 can be independently hydraulically actuated to retract the partially extended rod 38 which will now move the fork 18 across the centerline a distance equal to the distance between notch 52 and notch 58, that is, a distance of 12 inches in the example, past the full-in position.
  • both fork 16 and fork 18 are simultaneously positioned on one side of the centerline of the carriage 12.
  • the fork 18 can be moved to a position up to 12 inches across the centerline, it can also be seen that if the rod 38 is extended the full stroke from the jacket 36, the fork 18 can be moved not to the full-out position, but to 12 inches from the vertical member 30.
  • cylinder means 34 and coupling means 46 can be maneuvered so as to place the pin 60' in the notch 58' and slot 52'.
  • the fork 16 can be moved between a position 12 inches across the centerline of the carriage 12 and a position 12 inches from the vertical member 28.
  • both fork 16 and fork 18 can be simultaneously positioned on the other side of the centerline of the carriage 12.
  • the fork 16 and fork 18 can be shifted laterally along the carriage 12 between any number of positions other than those specifically described above. These positions depend on the relative position of the pair of cylinder means 32, 34, particularly rods 38, 42, to the forks 18, 16, as provided by the pair of coupling means 44, 46, and the amount of extending rods, 38, 42.
  • the present invention provides coupling means 44 and coupling means 46 which enable the forks 16,18 to be shifted laterally along the carriage 12 to any number of positions including particularly, positions in which both forks are simultaneously on one side or the other side of the centerline. Also, this positioning on the respective sides of the centerline is accomplished hydraulically be merely actuating the cylinder means 32 and cylinder means 34 once the notches 56, 58 and/or 56', 58' are hydraulically aligned with the corresponding slot 52 and/or 52'.
  • the coupling means 44 and coupling means 46 do not support the load that is picked up or carried by the forks 16, 18. Rather, this load is carried through the forks to the rails 24 and rails 26 on which the forks are supported. Consequently, the coupling means 44 and coupling means 46 can be relatively lightweight. Still furthermore, only a simple pin connection by means of releasable pin 60 and pin 60' is required to be able to slide bar 54 and bar 54' on the tracks 48' 50 and tracks 48', 50' in relation to the forks.
  • retaining ring 64 and retaining ring 64' will pop off, permitting rods 38, 42 to be decoupled from forks 18, 16 and preventing, for example, bending of the rods.

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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)

Claims (8)

1. Gabelhubschlittenanordung (10), die folgendes aufweist: einen Schlitten (12) mit oberen und unteren Horizontalschienen (24, 26) und ein Paar von Vertikalseitengliedern (28, 30) sowie zwei Gabeln (16, 18), die horizontal hin und her über den Schlitten auf Schienen bewegbar sind und mit zwei Zylindermitteln (32, 34) der jedes zwischen einem entsprechenden der Seitenglieder und der entsprechenden einen Gabel von den Gabeln, die näher zum anderen der Seitenglieder liegt, um die Gabel über den Schlitten zu bewegen, dadurch gekennzeichnet, daß jedes der Zylindermittel unabhängig von den anderen Zylindermitteln betätigbar ist und mit Mitteln (44, 46) zum Kuppeln dieser Zylindermittel mit der entsprechenden Gabel ausgestattet ist, und zwar selektiv an einer von zwei voneinander versetzten Stellen in Richtung der Gabelbewegung, wordurch der volle Hub der Zylindermittel entweder bewirken kann, daß sich die entsprechende Gabel zwischen einer Position benachbart zu dem einen Seitenglied des Schlittens und einer Mittellinie des Schlittens oder zwischen einer Position mit Abstand gegenüber dem einen Seitenglied des Schlittens und einer position über die Mittellinie des Schlittens hinaus bewegt.
2. Anordnung nach Anspruch 1, wobei jedes der Zylindermittel (32, 34) einen Mantel (36, 40) aufweist, der mit einem entspechenden der Seitenglieder verbunden ist, und mit einer Stange (28, 42), die durch die Mittel (44, 46) mit der entspechenden Gabel (16, 18) gekuppelt ist.
3. Anordung nach Anspruch 1 oder 2, wobei jedes der Kupplungsmittel (44, 46) folgendes aufweist: Führungsmittel (48, 50), die sich in Richtung der Gabelbewegung erstrecken, eine Stange (54) gleitend in Eingriff mit den Führungsmitteln, und Mittel (52, 56, 58, 60) zur Anordnung der Stange selektiv in einer von zwei Positionen bezüglich der Führungsmittel und entsprechend den zwei versetzten Stellen.
4. Anordnung nach Anspruch 3, wobei die Anordnungsmittel einen Schlitz (52) in den Führungsmitteln aufweisen, ein Paar von mit Abstand angeordneten Nuten (56, 58) in der Stange, wobei jede der Nuten in Ausrichtung mit dem Schlitz gebracht werden kann, und mit einem Stift (60) zum Eingriff in den Schlitz und der ausgerichteten Nut von den Nuten.
5. Anordnung nach Anspruch 4, wobei der Stift (60) mit einer federvorgespannten Kugel (68) ausgestattet ist, wobei jede Nut (56, 58) mit einer Rastoberfläche (70) ausgestattet ist, wobei die Kugel und Rastoberfläche zusammenarbeiten, um den Stift in einer der Nuten zu halten.
6. Anordnung nach einem der Anspruche 3 bis 5 und Anspruch 2, wobei in jedem der Kupplungsmittel (44, 46) die Fürungsmittel (48, 50) an der entsprechenden Gabel (16, 18) befestigt sind und die entsprechende Zylinderstange (38, 40) ist mit der entsprechenden Stange (54) durch einen Stift (62) verbunden, auf dem die Zylinderstange durch einen Haltering (64) gehalten ist, der derart ausgebildet ist, daß er bei übermäßiger Belastung ausfällt.
7. Anordnung nach Anspruch 6, wobei der ' Haltering ein Schnappring (64) ist.
8. Anordnung nach Anspruch 7, wobei der Schnappring ein elastomerer O-Ring (64) ist.
EP81900671A 1980-04-07 1980-04-07 Schlittenanordnung für einen Gabelstapler mit seitenverschieblich einstellbaren Gabelzinken Expired EP0050119B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1980/000380 WO1981002885A1 (en) 1980-04-07 1980-04-07 Load lifting carriage having side shift ajustable forks

Publications (3)

Publication Number Publication Date
EP0050119A1 EP0050119A1 (de) 1982-04-28
EP0050119A4 EP0050119A4 (de) 1982-07-13
EP0050119B1 true EP0050119B1 (de) 1985-06-19

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Application Number Title Priority Date Filing Date
EP81900671A Expired EP0050119B1 (de) 1980-04-07 1980-04-07 Schlittenanordnung für einen Gabelstapler mit seitenverschieblich einstellbaren Gabelzinken

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EP (1) EP0050119B1 (de)
WO (1) WO1981002885A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3632031A1 (de) * 1986-09-20 1988-04-07 Kaup Gmbh & Co Kg Vorbaugeraet mit zwei verschiebbaren gabelzinken
DE4020544A1 (de) * 1990-06-28 1992-01-02 Kaup Gmbh & Co Kg Vorsatzgeraet fuer einen gabelstapler mit vier gabelzinken
US11906347B2 (en) 2021-08-20 2024-02-20 Buckeye Scale Llc Adjustable width lift and weigh apparatus for lifting machines

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4632630A (en) * 1983-05-03 1986-12-30 Koehring Company Forklift attachment
US5823737A (en) * 1995-10-31 1998-10-20 Lucent Technologies Probemat handler
US9340376B2 (en) 2013-08-22 2016-05-17 Toyota Motor Engineering & Manufacturing North America, Inc. Apparatus and system for transferring carts
CN103434983B (zh) * 2013-08-28 2015-07-22 柳州柳工叉车有限公司 叉车工作装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3684113A (en) * 1970-06-12 1972-08-15 Skagit Corp Dunnage clamp for forklift trucks

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2270664A (en) * 1940-11-06 1942-01-20 Towmotor Co Industrial truck
US2663443A (en) * 1951-04-18 1953-12-22 Baker Raulang Co Carrier for industrial elevating trucks
US3634113A (en) * 1968-10-30 1972-01-11 Larry L Fehrenbacher Stabilized zirconium dioxide and hafnium dioxide compositions
US3754673A (en) * 1971-12-13 1973-08-28 Clark Equipment Co Detachable fork for lift trucks
FR2385640A2 (fr) * 1977-04-01 1978-10-27 Gibert Pierre Dispositif de fourches a deplacement lateral pour chariot elevateur
DE2726147A1 (de) * 1977-06-10 1978-12-21 Bengel Friedrich Gabelstapler

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3684113A (en) * 1970-06-12 1972-08-15 Skagit Corp Dunnage clamp for forklift trucks

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3632031A1 (de) * 1986-09-20 1988-04-07 Kaup Gmbh & Co Kg Vorbaugeraet mit zwei verschiebbaren gabelzinken
DE4020544A1 (de) * 1990-06-28 1992-01-02 Kaup Gmbh & Co Kg Vorsatzgeraet fuer einen gabelstapler mit vier gabelzinken
DE4020544C2 (de) * 1990-06-28 1999-07-01 Kaup Gmbh & Co Kg Vorsatzgerät für einen Gabelstapler mit zwei Gabelzinkenpaaren
US11906347B2 (en) 2021-08-20 2024-02-20 Buckeye Scale Llc Adjustable width lift and weigh apparatus for lifting machines

Also Published As

Publication number Publication date
EP0050119A4 (de) 1982-07-13
WO1981002885A1 (en) 1981-10-15
EP0050119A1 (de) 1982-04-28

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