EP0042835A1 - Side shift fork adjustable carriage. - Google Patents
Side shift fork adjustable carriage.Info
- Publication number
- EP0042835A1 EP0042835A1 EP80900520A EP80900520A EP0042835A1 EP 0042835 A1 EP0042835 A1 EP 0042835A1 EP 80900520 A EP80900520 A EP 80900520A EP 80900520 A EP80900520 A EP 80900520A EP 0042835 A1 EP0042835 A1 EP 0042835A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- forks
- tracks
- carriage
- carriage assembly
- affixed
- 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
Links
- 239000000463 material Substances 0.000 claims abstract description 34
- 239000012530 fluid Substances 0.000 claims description 10
- 230000006872 improvement Effects 0.000 claims description 4
- KKEBXNMGHUCPEZ-UHFFFAOYSA-N 4-phenyl-1-(2-sulfanylethyl)imidazolidin-2-one Chemical compound N1C(=O)N(CCS)CC1C1=CC=CC=C1 KKEBXNMGHUCPEZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000000151 deposition Methods 0.000 abstract 1
- 230000005484 gravity Effects 0.000 description 7
- 230000009467 reduction Effects 0.000 description 6
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000009428 plumbing Methods 0.000 description 1
- 235000015277 pork Nutrition 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- B66F9/146—Side shift, i.e. both forks move together sideways relative to fork support
-
- 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 material handling equipment and more particularly to fork lift vehicles. Specifically it deals with side shifting Of the material handling forks and the associated hydraulic circuitry for operation of the side shifting arrangement.
- the vehicle After maneuvering to pick up the load and subsequent to picking up the load, the vehicle is ordinarily driven to the off-loading point. The same maneuvering of the vehicle at the off-loading point that occurred at the loading point may also be necessary. That is, the vehicle may not be aligned with the loading dock, truck, or the like and thus the material handling vehicle must maneuver in order to position the load properly.
- load moment offset In providing a capability to shift the load handling elements laterally relative to the vehicle, it is important not to degrade forward visibility from the operators station. It is equally important to reduce the offset of the load, from the vehicle center of gravity, referred as load moment offset. Other desiderata include reduction of the number of hydraulic lines, closer spacing of the forks, and providing an operating system for the load handling elements that is sensitive to the load carried.
- OMPI _V * WIFO sideways in order to adjust or position the forks to pick up or deposit a load.
- Individual spacing of the forks upon such a side shift carriage may be accomplished manually or with additional hydraulic structure.
- the additional structure required to move the forks and carriage increases the load moment offset from the center of gravity of the vehicle by moving the forks further from the center of gravity. This, of course, reduces the load carrying capacity of the vehicle. Accordingly, reduction of the structure necessary to side shift the load, thus reducing the load moment offset, is advantageous.
- the reduction of the load moment offset by elimination of the structure to shift the * carriage and concentration of the side shift capability in the forks alone also reduces weight of the overall attachment. It .should be readily apparent that reduction of the overall weight and reduction of the load moment offset permits an increase in the load carrying capacity of the vehicle itself.
- Individual fork adjustment may also be appropriate when it is necessary to pick up a load with a center of gravity laterally offset from the center line of the vehicle.
- One fork may then be moved laterally across the face of the carriage in order to compensate for the offset center of gravity of the load.
- the load Once the load is picked up both forks and thus the load may be moved in the opposite direction to shift the center of gravity of the load to a point coincident .with the center line of the vehicle thus eliminating or reducing the possibility of overturning the vehicle.
- a material handling vehicle such as a fork lift or the like operates in an environment having numerous obstructions
- the forks may inadvertantly contact an obstruction while the vehicle is turning, thereby placing an undesirable side load on the fork.
- Such a load may result in damage to either the fork, the carriage, or in the event of a hydraulically operated side shift arrangement to the hydraulic circuitry. Damage which does occur as a result of contacting obstruction may result in loss of the use of the vehicle for that period of time necessary to repair it.
- the forks have been operable on a track structure with a runner or the like to locate the forks on a track
- SUBSTITUTE SHEET OMPI structure The nature of the structure is usually such that the forks may not be placed in an abutting relation, thus the total side shift of the individual forks may be reduced by the separation of the forks at their closest position.
- the present invention is directed to overcoming one or more of the problems as set forth above.
- a material handling vehicle has a mast, a carriage assembly adapted for generally vertical movement on the mast and a pair of load lifting forks mounted on the carriage.
- the improvement comprises a track ass ' embly for allowing lateral movement of the pair of load lifting forks from an abutting position to a spatially separated position.
- Powering means are provided for selectively moving one or the other of the forks along the track assembly.
- a material handling vehicle includes a mast, a carriage assembly adapted for generally vertical movement on the mast and a pair of load lifting forks mounted on the carriage.
- the improvement comprises a track assembly for allowing lateral movement of the load lifting forks from an abutting position to a spatially separated position and powering means for selectively moving one or the other of the forks or both forks at the same time with a load thereon.
- the powering means is sensitive to the weight imposed by the forks on the lift mechanism.
- Figure 1 is a diagrammatic perspective view of a-fork lift incorporating side shifting forks which form an embodiment of the present invention.
- Figure 2 is a diagrammatic front elevational view of the side adjusting forks shown in Figure 1.
- Figure 7 is a schematic diagram of the hydraulic control circuit for the side shifting fork arrangement.
- bearing bar 28 will be described in relationship with fork 18. It should be understood that the forks are symmetrical, thus permitting utilization of substantially identical parts with either fork. It should further be noted that certain parts associated with the forks are utilized at either end; however, the part may be reversed when associated with the fork at the opposite end. When such an instance occurs this will be noted.
- Carriage portion 20 is formed with a pair of center members 44 and 46 on which carriage rollers 48 are mounted. As is usual in the lift truck art, carriage rollers 48 roll on mast 14 for vertical movement of a carriage and fork assembly.
- a plate 50 which extends laterally across the face of the carriage forming the upper edge thereof.
- a front bearing plate 52 is affixed to plate 50 and extends downwardly therefrom as indicated in Figure 5.
- a rear bearing plate 54 is also affixed at plate 50 and extends downwardly generally at the center point or thereof. Front bearing plate and rear bearing plate 54 form the bearing surfaces upon which bearing bars 28 and 26 respectively ride.
- front bearing plate _ 2 and rear bearing plate 4 form the first pair of tracks 22, specifically track 22a being the rear track and track 22b being the front track.
- the bearing bars 26 and 28 are permitted to extend outwardly at the end of these tracks.
- the right end of track 22a (the rear track) as shown in Figure 5 is shown covered by a curved plate member 62 affixed to a vertical member 64, which forms a right side of the carriage.
- the -curved plate 62 may be used at the opposite or left hand of the carriage shown in Figure 2 if the plate is reversed as previously indicated. This is shown as curved plate 62' in Figures 2 and 4. Curved plate 62' closes the left hand of track 22b and permits the bearing bar to extend outwardly off the track.
- ⁇ JR __OM WIP bronze or the like may be positioned between bearing bar 30 and upper member 72 as indicated in Figure 6.
- vertical member 64 extends downwardly and is affixed to plate 66.
- a similar vertical 64' extends downwardly and Is affixed at that _ end to plate 66.
- Hydraulic circuit 102 in addition to jacks 90 and 92 includes a third jack 104 which Is operable to raise and lower the carriage 20 on mast 14.
- Hydraulic fluid under pressure is provided by a pump 106 drawing fluid from a tank 108. Fluid is
- Valve 118 feeds a pair of conduits 136 and 138, each of which feeds a branch conduit 140 and 142, respectively, leading to a double check valve 144 with a lead 147 to spring biased check valve 126.
- Normally closed check valve 126 blocks communication of lead 147 to a conduit 1 9 which communicates with tank 108.
- ⁇ on ⁇ uit 13b leads to valve 134 while conduit 138 leads to valve 132.
- conduit 136 With valve 134 in a straight through position, conduit 136 is interconnected with a conduit 146 leading to the head end of jack 90.
- conduit 13 leads to a conduit 148 which leads to the head end of jack 92.
- a third conduit 150 branches to the rod ends of both jacks 90 and 92.
- the forks 16 and 18 are adjustable on the carriage 20 with the carriage in any position on the mast. Further, the forks 16 and IB may be adjusted with any load thereupon. Specifically, forks 16 and 18 may be positioned as closely as shown in Figure 2, that is in an abutting relationship, or as a widely separated as shown in phantom in Figure 2, specifically at the extreme edges of the carriage. The forks are individually operable or operable together to move either to the left or to the right. Operation of the forks is accomplished by manipulation of side shift valve 118 in conjunction with valves 132 and 134. The following table illustrates the resulting action on jack 90 and jack 92 indicating the direction to the right or left as shown in Figure 7. -16-
Landscapes
- 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)
Abstract
Un dispositif de manipulation de materiau tel qu'un vehicule de levage (10) comprend une paire de fourches de manipulation de materiau (16, 18) montees sur un chariot (22) qui est mobile vers le haut et vers le bas sur un mat (14) par un cylindre de levage hydraulique (104). Les fourches de manipulation de materiau (16, 18) utilisables pour prendre, transporter, et deposer des articles, doivent etre positionnees de maniere appropriee sous l'article. Un systeme hydraulique (102) et des rails (22, 24) montees sur le chariot (20) permettent le mouvement selectif des fourches (16, 18) sur le chariot (20) depuis une position d'appui vers une position d'extension totale. Le circuit hydraulique (102) est sensible a la pression dans le cylindre de levage (104).A material handling device such as a lifting vehicle (10) includes a pair of material handling forks (16, 18) mounted on a carriage (22) which is movable up and down on a mat (14) by a hydraulic lifting cylinder (104). The material handling forks (16, 18) usable for picking up, transporting, and depositing articles, must be appropriately positioned under the article. A hydraulic system (102) and rails (22, 24) mounted on the carriage (20) allow the selective movement of the forks (16, 18) on the carriage (20) from a support position to an extension position total. The hydraulic circuit (102) is sensitive to the pressure in the lifting cylinder (104).
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US1980/000015 WO1981002001A1 (en) | 1980-01-07 | 1980-01-07 | Side shift fork adjustable carriage |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0042835A4 EP0042835A4 (en) | 1981-11-11 |
EP0042835A1 true EP0042835A1 (en) | 1982-01-06 |
EP0042835B1 EP0042835B1 (en) | 1985-08-21 |
Family
ID=22154143
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19800900520 Expired EP0042835B1 (en) | 1980-01-07 | 1980-01-07 | Side shift fork adjustable carriage |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0042835B1 (en) |
DE (1) | DE3071001D1 (en) |
WO (1) | WO1981002001A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0060245B1 (en) * | 1980-09-22 | 1986-03-19 | Caterpillar Industrial Inc. | Carriage assembly with shiftable forks |
US5326217A (en) * | 1990-09-24 | 1994-07-05 | Clark Material Handling Company | Lift truck with negative drop upright |
DK84893D0 (en) * | 1993-07-16 | 1993-07-16 | E L M Kragelund A S | HYDRAULIC CONTROLLED BEARING AND GRIBING EQUIPMENT, PRELIMINARY FOR USE ON FORK LIFTERS |
CN102167269B (en) * | 2011-05-03 | 2013-06-05 | 中国人民解放军总后勤部建筑工程研究所 | Integrated type forklift sidesway mechanism with internally-installed di-oil cylinder |
US9309099B2 (en) | 2014-06-20 | 2016-04-12 | Cascade Corporation | Side-shift limiter |
CN114803959B (en) * | 2022-04-29 | 2023-10-27 | 顺德职业技术学院 | Multi-pivot cargo handling forklift structure and fork arm positioning control method thereof |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2748966A (en) * | 1953-08-03 | 1956-06-05 | Gerlinger Carrier Co | Laterally adjustable tines for a lift truck |
US3075665A (en) * | 1960-12-05 | 1963-01-29 | Clark Equipment Co | Adjustable load engaging means for lift truck |
FR2274546A1 (en) * | 1974-06-14 | 1976-01-09 | Blereau Peg | Forklift truck fork adjustment mechanism - spring-loaded rollers lift forks clear of apron when unloaded |
FR2322085A1 (en) * | 1975-08-27 | 1977-03-25 | Bergerat Monnoyeur Sa | Fork mounting for lift truck - has rams pivoting and sliding fork frame on horizontal shaft fixed to slide by rotary sliding joint |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2613830A (en) * | 1948-03-15 | 1952-10-14 | Louie H Ponnequin | Lift truck fork |
US2795346A (en) * | 1953-07-16 | 1957-06-11 | Hyster Co | Load grip side shift for lift trucks |
US2958436A (en) * | 1957-10-21 | 1960-11-01 | Sebben S Skutle | Article handling method and apparatus |
US4185944A (en) * | 1978-06-29 | 1980-01-29 | Cascade Corporation | Slide structure for parallel arm clamps and the like |
-
1980
- 1980-01-07 WO PCT/US1980/000015 patent/WO1981002001A1/en active IP Right Grant
- 1980-01-07 DE DE8080900520T patent/DE3071001D1/en not_active Expired
- 1980-01-07 EP EP19800900520 patent/EP0042835B1/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2748966A (en) * | 1953-08-03 | 1956-06-05 | Gerlinger Carrier Co | Laterally adjustable tines for a lift truck |
US3075665A (en) * | 1960-12-05 | 1963-01-29 | Clark Equipment Co | Adjustable load engaging means for lift truck |
FR2274546A1 (en) * | 1974-06-14 | 1976-01-09 | Blereau Peg | Forklift truck fork adjustment mechanism - spring-loaded rollers lift forks clear of apron when unloaded |
FR2322085A1 (en) * | 1975-08-27 | 1977-03-25 | Bergerat Monnoyeur Sa | Fork mounting for lift truck - has rams pivoting and sliding fork frame on horizontal shaft fixed to slide by rotary sliding joint |
Non-Patent Citations (1)
Title |
---|
See also references of WO8102001A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1981002001A1 (en) | 1981-07-23 |
DE3071001D1 (en) | 1985-09-26 |
EP0042835B1 (en) | 1985-08-21 |
EP0042835A4 (en) | 1981-11-11 |
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