CA1052325A - Fork lift - Google Patents
Fork liftInfo
- Publication number
- CA1052325A CA1052325A CA187,240A CA187240A CA1052325A CA 1052325 A CA1052325 A CA 1052325A CA 187240 A CA187240 A CA 187240A CA 1052325 A CA1052325 A CA 1052325A
- Authority
- CA
- Canada
- Prior art keywords
- fork
- wheels
- vehicle
- fork lift
- pair
- 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
Links
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
- B66F9/07563—Fork-lift trucks adapted to be carried by transport vehicles
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)
- Handcart (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
This invention relates to fork lift vehicles. Prior art fork lift vehicles have forks which are powered only in the upward direction for lifting loads. Therefore, such vehicles cannot lift themselves upon the back of a truck. Further, such vehicles generally have their front wheels positioned adjacent the rear of the fork to enable the vehicle to place the fork under a load without interference from the front wheels. Such vehicles require heavy counter weights at the rear of the vehicle to prevent forward tilting about the front wheels when heavy loads are carried.
The present invention overcomes such problems by providing a fork lift vehicle having a vertically movable fork powered upwardly and downwardly.
The vehicle can be mounted on the rear of a truck provided with spaced longitudinal sockets for receiving the fork tines, the fork lift vehicle being capable of elevation and support by the truck by downward force applied on the fork after the tines are positioned in the sockets on the truck. The fork lift vehicle has a pair of forward wheels disposed laterally outwardly from the fork tines. These forward wheels are independently displaceable rearwardly to a point adjacent the rear of the fork prior to location of the tines in the sockets on the truck.
This invention relates to fork lift vehicles. Prior art fork lift vehicles have forks which are powered only in the upward direction for lifting loads. Therefore, such vehicles cannot lift themselves upon the back of a truck. Further, such vehicles generally have their front wheels positioned adjacent the rear of the fork to enable the vehicle to place the fork under a load without interference from the front wheels. Such vehicles require heavy counter weights at the rear of the vehicle to prevent forward tilting about the front wheels when heavy loads are carried.
The present invention overcomes such problems by providing a fork lift vehicle having a vertically movable fork powered upwardly and downwardly.
The vehicle can be mounted on the rear of a truck provided with spaced longitudinal sockets for receiving the fork tines, the fork lift vehicle being capable of elevation and support by the truck by downward force applied on the fork after the tines are positioned in the sockets on the truck. The fork lift vehicle has a pair of forward wheels disposed laterally outwardly from the fork tines. These forward wheels are independently displaceable rearwardly to a point adjacent the rear of the fork prior to location of the tines in the sockets on the truck.
Description
- The invention has as a general obJect the provision of a powered ~ork llrt truck~ the fork tines of which can be posi-tioned in elongated sockets carried by a motor truck and power applied to the fork, the power having a downward movement whereby the remainder of the fork lift vehicle is elevated to permit the fork lift vehicle to be transported by the motor truck with the fork lift vehicle out of contact with the road surface.
Another obiect of the invenkion is to provide a fork lift vehicle of the class described above with a pair of forward wheels which, in the normaI operation of the fork lift~ lie laterally outwardly with respect to the fork and its tines and wherein these ~orward wheels can be displaced rearwardly a~ least to a point ad~acent the rear portion of the rork so that the tines can be freely inserted in the sockets on the motor truck without interference from said forward wheels. It would be poor design to permanently locate the forward wheels ad~acent the rear of the fork because it would greatly limit the load capacity of the fork. ~urthermore, with the forward wheels displaced on a transverse line approximately midway of the length of the fork tines~ heavy loads can be handled without requiring a heavy counterweight on the rearward portion of the fork lift vehicleO
Another object of the invention is to provide a fork life vehicle with rearwardly retractable forward wheels wherein one Or the ~orward wheels can be retracted in truck loading operations where the retracted wheel, if left in its forward position~ would interfere with a rear truck wheel and prevent proper maneuvering of the rork lift vehicle to a position for depositing its load on the truck bed.
Other objects and advantages of the invention will more fully appear from the following description in connection wlth the accompanying drawings:
Fig4 1 is a side elevational view of a fork lift vehicle embodying one form o~ the invention;
Figo 2 is a front e~evational view of the ~ork li~t vehicle;
F-lgu 3 is a horizontal sectional view taken approxi-mately on the line 3-3 O:e Fig~ l;
Fig. 4 is an enlarged detail taken approx-lmatelylon the line 4-4 of Fig~ 3;
Figo 5 is a horlzontal longitudinal sectional view taken approximately on the line 5-5 of Fig~ 4;
Fig. 6 is an enlarged detail showing the ri~ht hal~ of the structure in Fig~ 5 with the sub-~rame locking bol-t in an alternate posltion;
Fig 7 is a side elevational view of the fork lift vehicle with its ~orward wheel assembly shown in forwardly dls-posed and retracted positions in broken and rull lines respec-tively~ and showing the fork in broken and ~ull lines to illustrate the manner in which the ~orward wheel assembly is elevated and retracted and the fork is positioned for reception in suitable sockets on the rear of the motor truck;
Fig. 8 is a side elevational view with portions broken away of the fork lift vehicle in its secured position for trans-portation in an elevated position by a motor truck;
Flg. 9 is a sectional vlew taken approximately on the line 9-9 of Figo 85 Fig. 10 is an enlarged detail of the manner in which the rear sub-frame for each forward wheel and auxillary whee~ is pivotally supported for retraction from its ~orward posltion.
Figu 11 is a side elevational view of a fork 11ft vehicle showing a different form of retractable forward wheel structure;
Fig~ 12 is a view of the structure in Figo 11 with the forward wheels retracted and the fork lift vehicle supported at the end of a truck chassis.
The device of Figso 1 through 10 includes a fork lift vehicle 14 having longitudinal frame side members 16 and one or more cross members, a forward cross member being shown at 18. A
pair of vertical fork guide frames 20 extend upwardl.y ~rom adjacent -the forward cross frame member 180 Each vertical guide frame 20 is pivotally connected at 22 to one each o~ a pair of upwardly and rearwardly extending brackets 24 welded to the cross frame 18 as indicated at 26 in Fig. 2. The lower ends of the vertical guide frame members 20 are connected by a cross member 28. The vertical frame members are connected at vertical~y spaced points by cross members 30 and 320 Connected to the lower vertical ~rame cross member 28 as indicated at 34, is the lower end of a hydraulic cylinder 36 into which extends a piston rod 38 having the conventional piston not shownO '['he lower end of the cylinder 36 is provided with a hydraulic line connection 40 for the admission of pressurized hydraulic fluid beneath the piston and the cylinder 36 and an upper connection 42 is pro-vided for pressurized hydraulic fluid which acts against the top of the piston in the cylinder 36. Thus~ both the upward and downward skrokes of the piston rod 38 are power strokes.
The upper ends of the piston rod 3~ is connected to a cross piece 44 whose ends are suitably secured to the upper ends of a pair of spaced tubes 46 which as shown in Figo 3, are pro-vided with rollers 48 rotating in the vertical stationary frame members 20. Any suitable number of rollers 48 can be used at vertically spaced points along their respective tubes 46. Short forwardly disposed webs 50 connect the vertical tubes 46 with a pair of vertically spaced fork cross members 52 and 54. The outer ends of the fork cross members 52 and 54 are connected by plates 56 and to each plate is welded or otherwise suitably secured thereto a vertical portion 58 of a fork member 60g and each fork member also including a horizontal tine 62.
The cross piece 30 extending between the vertical ~rame members 20 is pivotally connected at 64 to a piston rod 66 extending into a hydraulic cylinder 68 whose left end is pivot-ally connected at 70 to the top 72 o~ a fork li~t vehicle houslng 74 within which is located a hydraulic pump and reservoir) all conventionally indicated by broken lines at 76, these being con-ventional parts of a fork lift mechanismO Supported by the housing 74 is a seat 78 and a steering wh~-el 80, and such other : controls as are necessary to operate the fork lift vehicle.
These controls are not shown because they also are conventional and well known in the artO
The cylinder and piston unit 68, 66 connected between the housing 74 and the vertical frame members 20 are used to tilt said frame members 20 and the fork mechanism so that the fork members 60 and their tines 62 can be tilted somewhat as necessary in the engagement and disengagement of articles, such as pallets, and also to permit the .~ork to be tilted rearwardly sl:lghtly when carrying a load which might otherwise tilt and fall forwardly ~rom the forkO
The rear of the fork lift vehicle is supported centrally in a transverse direction by a single rear wheel 82 which is con-nected by a chain 84 to a hydraulic motor 86, the latter beingdriven by the usual motor and main hydraulic pumpO The manner in whlch the slngle rear wheel 82 is steered is also not illus-trated since that mechanism is also quite conventionalO
On each side of the forward portion o~ the fork lift vehicle is a wheel 900 Each wheel 90 is mounted on a stub axle 92 carrying a gear 940 A chain 96 drives the gear 94 from a driving gear 98 on a hydraulic wheel motor lOOo The stub axle 92~ the wheel motor 100 and the respective gears are all sup-ported by a sub-~rame 102 which is pivotally connected at 104 to the forward portion o~ its respective main frame side member 16 The stub frame 102 as shown in Fig 5 has an of~set rearward extension 106 which is mounted on the sub-frame pivot 104v The o~fset 106 is secured to the sub-frame 102 by welding indicated at 108 in Fig. 5 so that said sub-~rarne 102 and off'set rearward extension 106 are in e~ect a sin~le rigid structure~
Mounted in the sub-frame offsek 106 is a bearing 110 in which is a stub sha~-t 112 which carries on its outer end an auxiliary wheel 114.
When the sub-frame 102 is in its downward and forward position as illustrated in Fig. 5, a pin 116 which prot.rudes rearwardly from the rear end of the main sub-frame 102 lies in a groove 118 in a ~orward end piece 120 in the main side frame 160 This pin and groove arrangement assists the sub-frame pivot 104 in securely holding the sub-frame in its forward position and agalnst undue lateral shi~tingO
The forward side portion o~ the main ~rame 16 is pro-vided with a hole 122 which matches a hole 12L~ in one side of the sub~frame rearward extension 106 and matches with a hole 125 in the outer side o~ the sub-frame extension, Said extension 106 has one end o~ a sleeve 128 welded thereto as shown in Figo 5.
Extending through sleeve 1.28 is a locking bolt 130 which extends through the holes 126 and 124 in the sub-frame extension and the coinciding hole 122 in the side of the ~orward portion of' the main frame member 160 Within the sleeve 128 is a spring 132 whose outer or lower end as viewed in Fig. 5J iS anchored in the sleeve 1280 The inner or upper end o~ the spring is movable outwardly in the sleeve 128 with the bolt 130 by reason o~ a pin 13~ which is mounted in the bolt 130 and engages a convolution o~ the springO me bolt 130 extends outwardly of the sleeve 128 and is provided with a pull handle 1360 It will be seen that when the handle 136 is pulled to pull the pin 130 ~rom the hole 122 in the side of the forward end o~ the main frameJ the sub-~rame 102 and lts rearward extension 106 can be swung upwardly and rearwardly relative to the main frameO In order to retain the bolt ].30 in its retracted position, the pin 134 has its outer end riding in a slot 138, said slot having an ang].ed outer end in the manner o~
a bayonet slot 50 that when the bolt 130 is retracted as stated above to the point where the pin 13l~ is at the outer end of the slot 138, a slight counterclockwise turn of the bolt handle 136 will ].odge the pin in the angled end of the slot and releasably hold the bolt 130 in its retracted position. Referring to Fig, 7 the sub-frame 102 has been released through manipulation of the bolt 130 and swun~ from its roughly horizont;al forwardly dis-posed pos:ition, indicated in broken lines~ t;o an upwardly and somewhat rearwardly directed position shown in full ].ines~ In order to accomplish this~ the fork 60 must be lowered into con-tact with the ground and hydraulic force applied through the conduit 42 at the upper end of the vertical cylinder 36. This creates a downward push on the fork sufficient to elevate the forward portion of the fork lift vehicle and more particularly the forward wheels gO. The fork in this position is shown in broken lines in Figo 7~ As the sub-frarne 102 and wheel 90 is swung upwardly about the pivot 104~ the auxiliary wheel 114 will be swung downwardly in a counterclockwise direction until it engages the ground, or the fork can be forced downwardly to lift the vehicle slightly more than shown in Fig. 7 until the sub-frame 102 is swung to the full line position and then the fork raised sufficiently for the auxiliary wheel 114 to engage the ground in a vehicle supporting position. It will be noted that in this position illustrated i.n Fig. 7~ the sub-frame 102 has been swun~ rearwardly over vertical dead center so that the weight of the fork lift vehicle on auxiliary wheels 114 will maintain the sub-frame 102 in its rearward over center posi-tionO
lt will be seen that the wheels 90 in their retracted position are ad~acent the rear of the fork 60 and more speci-fically are actually rearward of the fork constructlon; theauxiliary wheels lie in a vertlcal plane also adjacent the rear of the fork 604 This leaves the fQrk tines 62 e~tendin~ for-wardly of any other portion of the fork lift vehicle, Ther~fore, the ~ork can be raised to the full line position of Fig. 7 with the tines 62 in alignment with tubular sockets 140 wh-lch are mounted on inverted U-shaped ~upports 142 and 144 which extend downwardly from the underside o~ the truck bed 146~ When the tines 62 are aligned with the tubular sockets 140, the fork lift vehicle can be drlven forwardly under power from the single rear wheel 82 and the tines run only into the sockets 140 as shown in Figo 80 In this figure it will be seen that each socket 140 has an upward rear slotted portinn 148 to receive a portion of the vertical ~ork member 58 to assist in preventing the fork elements from tilting in the sockets 140~
When the fork tines have been located in the sockets 140, power is applied to the fork to tend to move it in a down-ward direction~ Since the fork tines are located in the sockets 14OJ the fork cannot move downwardly and the result is that the remainder of the f'ork lift vehicle is raised. This raised posi-tion is illustrated in Fig. 8.
In order to insure the retention of the fork tines 62 in the sockets 140 a winch 150 is mounted on each side of the rear end of the truck bed 146~ the winch being rotated by a suitable handle 152 on the winch shaft 154. A ratchet 156 and a suitable pawl (the latter not shown) releasably secures the winch in the customary manner. A cable 158 on the winch has an eye 160 on its free end to permit the cable to be secured to a hook 162, there being one of each cable and hook and the hook being located on the rear portion of the main frame 16~ In Figs~ 11 and 12 there is illustrated a modification wherein forward wheels 164 each carried by a horizontal square shaft 166 are sli~able fore and aft in a square tubing 168 mounted on the side of a fork lift vehicle frame member 170, The forward end of the tube 168 term-inates short of the forward end of the frame member 170 and the square sha~t 166 which supports the wheel 164 is sufriciently long to permit said wheel 164 to be extended to a vertical p:Lane which intersects the fork tines 62. Carried on top of the square tubi.ng 168 is a hydraulic cylinder 172 having pressure fluid ., connections 1.7~ which alternately serve as inlets and outlets so that a piston (not shown) in the cylinder 172 and connected to a piston rod 176 can retract the wheel 164 or move it forwardly to the posîtion of Figo llo When the wheel is retracted, it lies at the rear of the fork 60 so -that the fork tines 62 can be inserted in their sockets 140 and the vehicle el.evat~ed to the position of Figo 12 in the same manner as that described in connection with the preceding embodimentO
From the foregoing it will be seen that this is a fork lift vehicle which can be conveniently mounted upon the rear portion of a motor truck for transportation without being re-quired to tow the fork lift vehicle. It is provided with forward working whee].s gO and in the other embodiment 16L~, which wheels are located for~ardly of the rear of the fork body and generally midway between the front and rear of~the hdrizontal tines~
These wheels are sturdy enough to support the loads for which the fork lift vehicle was built. These wheels can be retracted and the ~ork lift vehicle supported by rearwardly disposed auxiliary wheels which need be strong enou~h only to support the unloaded ` fork lift vehicleO These auxiliary wheels permit maneuvering of the vehicle to a position where the fork tines are in an elevated position~ aligned with the tine-receiving sockets carried by the motor truck.
It is important to note that in both embodiments of the invention it is possible to retract one of the forward pair of wheels so that the fork lif-t vehicle can maneuver close to the rear corner of the t:ruck bed ~or unloading a ~.oaded pallet or the like~ While it is not possible to travel any distance with one of the forward wheels retracted and a heavy load on the fork~
the device is capable of displacing the load from the truck to the fork lift vehicle by extending the retracted wheel while ~ ~;2;~ ~
removing the weight from an area on the truck bed where the truck wheels interfere with the ~ront wheels of the fork lifto It will o~ course be understood that various changes can be made in the ~or~/ details, arrangement and proportions of the various parts without departing rrom the scope o~ our inven-tion.
Another obiect of the invenkion is to provide a fork lift vehicle of the class described above with a pair of forward wheels which, in the normaI operation of the fork lift~ lie laterally outwardly with respect to the fork and its tines and wherein these ~orward wheels can be displaced rearwardly a~ least to a point ad~acent the rear portion of the rork so that the tines can be freely inserted in the sockets on the motor truck without interference from said forward wheels. It would be poor design to permanently locate the forward wheels ad~acent the rear of the fork because it would greatly limit the load capacity of the fork. ~urthermore, with the forward wheels displaced on a transverse line approximately midway of the length of the fork tines~ heavy loads can be handled without requiring a heavy counterweight on the rearward portion of the fork lift vehicleO
Another object of the invention is to provide a fork life vehicle with rearwardly retractable forward wheels wherein one Or the ~orward wheels can be retracted in truck loading operations where the retracted wheel, if left in its forward position~ would interfere with a rear truck wheel and prevent proper maneuvering of the rork lift vehicle to a position for depositing its load on the truck bed.
Other objects and advantages of the invention will more fully appear from the following description in connection wlth the accompanying drawings:
Fig4 1 is a side elevational view of a fork lift vehicle embodying one form o~ the invention;
Figo 2 is a front e~evational view of the ~ork li~t vehicle;
F-lgu 3 is a horizontal sectional view taken approxi-mately on the line 3-3 O:e Fig~ l;
Fig. 4 is an enlarged detail taken approx-lmatelylon the line 4-4 of Fig~ 3;
Figo 5 is a horlzontal longitudinal sectional view taken approximately on the line 5-5 of Fig~ 4;
Fig. 6 is an enlarged detail showing the ri~ht hal~ of the structure in Fig~ 5 with the sub-~rame locking bol-t in an alternate posltion;
Fig 7 is a side elevational view of the fork lift vehicle with its ~orward wheel assembly shown in forwardly dls-posed and retracted positions in broken and rull lines respec-tively~ and showing the fork in broken and ~ull lines to illustrate the manner in which the ~orward wheel assembly is elevated and retracted and the fork is positioned for reception in suitable sockets on the rear of the motor truck;
Fig. 8 is a side elevational view with portions broken away of the fork lift vehicle in its secured position for trans-portation in an elevated position by a motor truck;
Flg. 9 is a sectional vlew taken approximately on the line 9-9 of Figo 85 Fig. 10 is an enlarged detail of the manner in which the rear sub-frame for each forward wheel and auxillary whee~ is pivotally supported for retraction from its ~orward posltion.
Figu 11 is a side elevational view of a fork 11ft vehicle showing a different form of retractable forward wheel structure;
Fig~ 12 is a view of the structure in Figo 11 with the forward wheels retracted and the fork lift vehicle supported at the end of a truck chassis.
The device of Figso 1 through 10 includes a fork lift vehicle 14 having longitudinal frame side members 16 and one or more cross members, a forward cross member being shown at 18. A
pair of vertical fork guide frames 20 extend upwardl.y ~rom adjacent -the forward cross frame member 180 Each vertical guide frame 20 is pivotally connected at 22 to one each o~ a pair of upwardly and rearwardly extending brackets 24 welded to the cross frame 18 as indicated at 26 in Fig. 2. The lower ends of the vertical guide frame members 20 are connected by a cross member 28. The vertical frame members are connected at vertical~y spaced points by cross members 30 and 320 Connected to the lower vertical ~rame cross member 28 as indicated at 34, is the lower end of a hydraulic cylinder 36 into which extends a piston rod 38 having the conventional piston not shownO '['he lower end of the cylinder 36 is provided with a hydraulic line connection 40 for the admission of pressurized hydraulic fluid beneath the piston and the cylinder 36 and an upper connection 42 is pro-vided for pressurized hydraulic fluid which acts against the top of the piston in the cylinder 36. Thus~ both the upward and downward skrokes of the piston rod 38 are power strokes.
The upper ends of the piston rod 3~ is connected to a cross piece 44 whose ends are suitably secured to the upper ends of a pair of spaced tubes 46 which as shown in Figo 3, are pro-vided with rollers 48 rotating in the vertical stationary frame members 20. Any suitable number of rollers 48 can be used at vertically spaced points along their respective tubes 46. Short forwardly disposed webs 50 connect the vertical tubes 46 with a pair of vertically spaced fork cross members 52 and 54. The outer ends of the fork cross members 52 and 54 are connected by plates 56 and to each plate is welded or otherwise suitably secured thereto a vertical portion 58 of a fork member 60g and each fork member also including a horizontal tine 62.
The cross piece 30 extending between the vertical ~rame members 20 is pivotally connected at 64 to a piston rod 66 extending into a hydraulic cylinder 68 whose left end is pivot-ally connected at 70 to the top 72 o~ a fork li~t vehicle houslng 74 within which is located a hydraulic pump and reservoir) all conventionally indicated by broken lines at 76, these being con-ventional parts of a fork lift mechanismO Supported by the housing 74 is a seat 78 and a steering wh~-el 80, and such other : controls as are necessary to operate the fork lift vehicle.
These controls are not shown because they also are conventional and well known in the artO
The cylinder and piston unit 68, 66 connected between the housing 74 and the vertical frame members 20 are used to tilt said frame members 20 and the fork mechanism so that the fork members 60 and their tines 62 can be tilted somewhat as necessary in the engagement and disengagement of articles, such as pallets, and also to permit the .~ork to be tilted rearwardly sl:lghtly when carrying a load which might otherwise tilt and fall forwardly ~rom the forkO
The rear of the fork lift vehicle is supported centrally in a transverse direction by a single rear wheel 82 which is con-nected by a chain 84 to a hydraulic motor 86, the latter beingdriven by the usual motor and main hydraulic pumpO The manner in whlch the slngle rear wheel 82 is steered is also not illus-trated since that mechanism is also quite conventionalO
On each side of the forward portion o~ the fork lift vehicle is a wheel 900 Each wheel 90 is mounted on a stub axle 92 carrying a gear 940 A chain 96 drives the gear 94 from a driving gear 98 on a hydraulic wheel motor lOOo The stub axle 92~ the wheel motor 100 and the respective gears are all sup-ported by a sub-~rame 102 which is pivotally connected at 104 to the forward portion o~ its respective main frame side member 16 The stub frame 102 as shown in Fig 5 has an of~set rearward extension 106 which is mounted on the sub-frame pivot 104v The o~fset 106 is secured to the sub-frame 102 by welding indicated at 108 in Fig. 5 so that said sub-~rarne 102 and off'set rearward extension 106 are in e~ect a sin~le rigid structure~
Mounted in the sub-frame offsek 106 is a bearing 110 in which is a stub sha~-t 112 which carries on its outer end an auxiliary wheel 114.
When the sub-frame 102 is in its downward and forward position as illustrated in Fig. 5, a pin 116 which prot.rudes rearwardly from the rear end of the main sub-frame 102 lies in a groove 118 in a ~orward end piece 120 in the main side frame 160 This pin and groove arrangement assists the sub-frame pivot 104 in securely holding the sub-frame in its forward position and agalnst undue lateral shi~tingO
The forward side portion o~ the main ~rame 16 is pro-vided with a hole 122 which matches a hole 12L~ in one side of the sub~frame rearward extension 106 and matches with a hole 125 in the outer side o~ the sub-frame extension, Said extension 106 has one end o~ a sleeve 128 welded thereto as shown in Figo 5.
Extending through sleeve 1.28 is a locking bolt 130 which extends through the holes 126 and 124 in the sub-frame extension and the coinciding hole 122 in the side of the ~orward portion of' the main frame member 160 Within the sleeve 128 is a spring 132 whose outer or lower end as viewed in Fig. 5J iS anchored in the sleeve 1280 The inner or upper end o~ the spring is movable outwardly in the sleeve 128 with the bolt 130 by reason o~ a pin 13~ which is mounted in the bolt 130 and engages a convolution o~ the springO me bolt 130 extends outwardly of the sleeve 128 and is provided with a pull handle 1360 It will be seen that when the handle 136 is pulled to pull the pin 130 ~rom the hole 122 in the side of the forward end o~ the main frameJ the sub-~rame 102 and lts rearward extension 106 can be swung upwardly and rearwardly relative to the main frameO In order to retain the bolt ].30 in its retracted position, the pin 134 has its outer end riding in a slot 138, said slot having an ang].ed outer end in the manner o~
a bayonet slot 50 that when the bolt 130 is retracted as stated above to the point where the pin 13l~ is at the outer end of the slot 138, a slight counterclockwise turn of the bolt handle 136 will ].odge the pin in the angled end of the slot and releasably hold the bolt 130 in its retracted position. Referring to Fig, 7 the sub-frame 102 has been released through manipulation of the bolt 130 and swun~ from its roughly horizont;al forwardly dis-posed pos:ition, indicated in broken lines~ t;o an upwardly and somewhat rearwardly directed position shown in full ].ines~ In order to accomplish this~ the fork 60 must be lowered into con-tact with the ground and hydraulic force applied through the conduit 42 at the upper end of the vertical cylinder 36. This creates a downward push on the fork sufficient to elevate the forward portion of the fork lift vehicle and more particularly the forward wheels gO. The fork in this position is shown in broken lines in Figo 7~ As the sub-frarne 102 and wheel 90 is swung upwardly about the pivot 104~ the auxiliary wheel 114 will be swung downwardly in a counterclockwise direction until it engages the ground, or the fork can be forced downwardly to lift the vehicle slightly more than shown in Fig. 7 until the sub-frame 102 is swung to the full line position and then the fork raised sufficiently for the auxiliary wheel 114 to engage the ground in a vehicle supporting position. It will be noted that in this position illustrated i.n Fig. 7~ the sub-frame 102 has been swun~ rearwardly over vertical dead center so that the weight of the fork lift vehicle on auxiliary wheels 114 will maintain the sub-frame 102 in its rearward over center posi-tionO
lt will be seen that the wheels 90 in their retracted position are ad~acent the rear of the fork 60 and more speci-fically are actually rearward of the fork constructlon; theauxiliary wheels lie in a vertlcal plane also adjacent the rear of the fork 604 This leaves the fQrk tines 62 e~tendin~ for-wardly of any other portion of the fork lift vehicle, Ther~fore, the ~ork can be raised to the full line position of Fig. 7 with the tines 62 in alignment with tubular sockets 140 wh-lch are mounted on inverted U-shaped ~upports 142 and 144 which extend downwardly from the underside o~ the truck bed 146~ When the tines 62 are aligned with the tubular sockets 140, the fork lift vehicle can be drlven forwardly under power from the single rear wheel 82 and the tines run only into the sockets 140 as shown in Figo 80 In this figure it will be seen that each socket 140 has an upward rear slotted portinn 148 to receive a portion of the vertical ~ork member 58 to assist in preventing the fork elements from tilting in the sockets 140~
When the fork tines have been located in the sockets 140, power is applied to the fork to tend to move it in a down-ward direction~ Since the fork tines are located in the sockets 14OJ the fork cannot move downwardly and the result is that the remainder of the f'ork lift vehicle is raised. This raised posi-tion is illustrated in Fig. 8.
In order to insure the retention of the fork tines 62 in the sockets 140 a winch 150 is mounted on each side of the rear end of the truck bed 146~ the winch being rotated by a suitable handle 152 on the winch shaft 154. A ratchet 156 and a suitable pawl (the latter not shown) releasably secures the winch in the customary manner. A cable 158 on the winch has an eye 160 on its free end to permit the cable to be secured to a hook 162, there being one of each cable and hook and the hook being located on the rear portion of the main frame 16~ In Figs~ 11 and 12 there is illustrated a modification wherein forward wheels 164 each carried by a horizontal square shaft 166 are sli~able fore and aft in a square tubing 168 mounted on the side of a fork lift vehicle frame member 170, The forward end of the tube 168 term-inates short of the forward end of the frame member 170 and the square sha~t 166 which supports the wheel 164 is sufriciently long to permit said wheel 164 to be extended to a vertical p:Lane which intersects the fork tines 62. Carried on top of the square tubi.ng 168 is a hydraulic cylinder 172 having pressure fluid ., connections 1.7~ which alternately serve as inlets and outlets so that a piston (not shown) in the cylinder 172 and connected to a piston rod 176 can retract the wheel 164 or move it forwardly to the posîtion of Figo llo When the wheel is retracted, it lies at the rear of the fork 60 so -that the fork tines 62 can be inserted in their sockets 140 and the vehicle el.evat~ed to the position of Figo 12 in the same manner as that described in connection with the preceding embodimentO
From the foregoing it will be seen that this is a fork lift vehicle which can be conveniently mounted upon the rear portion of a motor truck for transportation without being re-quired to tow the fork lift vehicle. It is provided with forward working whee].s gO and in the other embodiment 16L~, which wheels are located for~ardly of the rear of the fork body and generally midway between the front and rear of~the hdrizontal tines~
These wheels are sturdy enough to support the loads for which the fork lift vehicle was built. These wheels can be retracted and the ~ork lift vehicle supported by rearwardly disposed auxiliary wheels which need be strong enou~h only to support the unloaded ` fork lift vehicleO These auxiliary wheels permit maneuvering of the vehicle to a position where the fork tines are in an elevated position~ aligned with the tine-receiving sockets carried by the motor truck.
It is important to note that in both embodiments of the invention it is possible to retract one of the forward pair of wheels so that the fork lif-t vehicle can maneuver close to the rear corner of the t:ruck bed ~or unloading a ~.oaded pallet or the like~ While it is not possible to travel any distance with one of the forward wheels retracted and a heavy load on the fork~
the device is capable of displacing the load from the truck to the fork lift vehicle by extending the retracted wheel while ~ ~;2;~ ~
removing the weight from an area on the truck bed where the truck wheels interfere with the ~ront wheels of the fork lifto It will o~ course be understood that various changes can be made in the ~or~/ details, arrangement and proportions of the various parts without departing rrom the scope o~ our inven-tion.
Claims (10)
1. A fork lift for use with a truck chassis having fork tine sockets thereon, wherein the improvement comprises: a powered fork lift vehicle having a frame assembly and a fork with a pair of general-ly horizontal tines, means on the vehicle and carrying said fork for raising and lowering the fork under power, the fork being located at the forward end of the vehicle, wheel means supporting the rear end of the vehicle, a pair of wheels at the forward end of the vehicle and positioned laterally outwardly of the fork, said fork lift vehicle frame assembly comprising a main frame and forwardly extending sub-frame members carrying one each of said pair of wheels, the wheels being on the forward ends of the sub-frame members, said sub-frame members each having a movable connection with the main frame rear-wardly of said pair of wheels, and the sub-frame members and wheels being movable from a main frame supporting position to a position rear-wardly relative to the main frame and fork to permit the fork tines to be inserted in said sockets on the vehicle chassis and the fork lift vehicle raised by the application of lowering power to the fork, each said sub-frame having an auxiliary wheel thereon rearwardly of the sub-frame pivotal connection, said auxiliary wheels being held out of contact with the ground when said pair of wheels is in ground contact, and the auxiliary wheels being in fork lift frame supporting ground contact when said pair of wheels is retracted.
2. The fork lift as claimed in Claim 1, wherein said vehicle includes: an upstanding fork guide, the fork being vertically movable on said guide: vertically movable double acting power means on said vehicle and connected to said fork to raise and lower said fork, said fork being movable downwardly under power to a position to engage the ground and raise said pair of wheels from the ground to support the forward end of the vehicle, and to permit the sub-frames and said pair of wheels to be retracted.
3. The fork lift as claimed in Claim 1, including means releasably locking each sub-frame to the main frame when said pair of wheels are in their main frame supporting position.
4. The fork lift as claimed in Claim 1, including means re-leasably interconnecting the sub-frames and the main frame when the sub-frames and said pair of wheels are in their main frame supporting position.
5. The fork lift as claimed in Claim 1, including tie means for connection between the fork lift vehicle and a truck chassis upon which the fork lift vehicle is mounted with the fork tines in said sockets, to prevent dislodgment of the fork tines from said sockets.
6. The fork lift as claimed in Claim 5, wherein said tie means includes a winch and cable means.
7. The fork lift as claimed in Claim 7, including means carried by said vehicle frame supporting said pair of wheels for rectilinear movement from said main frame supporting positions to positions adjacent the rear of the fork.
8. The fork lift as claimed in Claim 7, including a double-acting piston and cylinder unit supported adjacent and parallel to said means for supporting the pair of wheels for rectilinear move-ment so that the path of travel of the piston and cylinder unit is parallel to the path of travel of one of said pair of wheels.
9. The fork lift as claimed in Claim 8, including independ-ently actuated piston and cylinder units adjustable to produce in-dependent retraction and extension of left and right forward wheels.
10. The fork lift as claimed in Claim 8, including simul-taneously actuable piston and cylinder units linearly adjustable to change the distance between the rear and front wheels and conse-quently change the weight displacement on the forward wheels.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00326745A US3799379A (en) | 1973-01-26 | 1973-01-26 | Fork lift |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1052325A true CA1052325A (en) | 1979-04-10 |
Family
ID=23273529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA187,240A Expired CA1052325A (en) | 1973-01-26 | 1973-12-03 | Fork lift |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US3799379A (en) |
| JP (1) | JPS49110067A (en) |
| AR (1) | AR200300A1 (en) |
| AT (1) | AT337602B (en) |
| BE (1) | BE809709A (en) |
| CA (1) | CA1052325A (en) |
| CH (1) | CH575339A5 (en) |
| DE (1) | DE2402704C2 (en) |
| ES (1) | ES422642A1 (en) |
| FI (1) | FI58317C (en) |
| FR (1) | FR2215380B1 (en) |
| GB (1) | GB1455511A (en) |
| IT (1) | IT1007091B (en) |
| NL (1) | NL7400447A (en) |
| SE (1) | SE385575B (en) |
| ZA (1) | ZA7483B (en) |
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| NL165992C (en) * | 1975-01-21 | 1981-06-15 | Kooi Bv | FORKLIFT. |
| JPS5193013A (en) * | 1975-02-10 | 1976-08-14 | Keitaikanona rifutosochinyoru niekihoho oyobi rifutosochinokozo | |
| JPS522948A (en) * | 1975-06-25 | 1977-01-11 | Toyo Umpanki Co Ltd | Method of locking forklift truck to carry vehicle |
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| US4180363A (en) * | 1978-03-30 | 1979-12-25 | Johnson Clifton E | Attachment device for a fork lift |
| CA1113891A (en) * | 1979-06-21 | 1981-12-08 | Gerardus J. Brouwer | Forklift vehicle |
| US4266795A (en) * | 1979-10-22 | 1981-05-12 | Walker Donald G | Forklift towing structure |
| CA1164503A (en) * | 1981-07-14 | 1984-03-27 | Brouwer Turf Equipment Limited | Apparatus for mounting a forklift vehicle on a carrier vehicle |
| US4485894A (en) * | 1982-05-24 | 1984-12-04 | The Knickerbocker Company | Lift truck mast and carriage assembly |
| US4460064A (en) * | 1982-06-03 | 1984-07-17 | Lutz David W | Forklift truck capable of raising and lowering itself and a load back and forth between two surfaces at different levels |
| JPS5943231U (en) * | 1982-09-16 | 1984-03-21 | 愛知車輌株式会社 | Self-propelled aerial work vehicle |
| US4948326A (en) * | 1987-05-22 | 1990-08-14 | Henry Bedard | Load lifting attachment mounted on a truck frame |
| CA2012552A1 (en) * | 1989-03-23 | 1996-06-22 | Gunther Gebhardt | Armour |
| US5217342A (en) * | 1991-10-31 | 1993-06-08 | Martin Grether | Self-loading and unloading forklift truck |
| US5320475A (en) * | 1991-11-19 | 1994-06-14 | Pinder Stanley N | Retriever and cart for handling heavy containers |
| US5174415A (en) * | 1991-12-16 | 1992-12-29 | Teledyne Princeton, Inc. | Walk behind fork lift truck |
| FR2691116B1 (en) * | 1992-05-18 | 1994-08-19 | Bennes Marrel | Forklift tie-down support at the rear of a truck platform, tie-down system comprising this support, and truck fitted with this system. |
| US5651658A (en) * | 1993-07-13 | 1997-07-29 | Holmes; Arthur Jack | Articulated lift truck |
| US5370494A (en) * | 1993-07-13 | 1994-12-06 | Holmes; Arthur J. | Self-propelled lift truck |
| GB9317628D0 (en) * | 1993-08-25 | 1993-10-13 | Wilson Frederick G | Improved demountable forklift truck for vehicles |
| FR2709711B1 (en) * | 1993-09-10 | 1995-11-24 | Audureau Omfort | System for attaching a forklift to at least four attachment elements, cradle for attachment and corresponding forklift. |
| US5480275A (en) * | 1993-10-18 | 1996-01-02 | Taylor Iron-Machine Works, Inc. | Fork lift truck |
| CA2137479A1 (en) * | 1993-12-20 | 1995-06-21 | Mitsuhiro Kishi | Fork lift truck loading mechanism |
| GB2286806B (en) * | 1994-02-26 | 1997-08-27 | Nathan Gwyllim Rees John | Apparatus for converting a two or more axle wheeled vehicle into a single axle trailable wheeled vehicle |
| US5417541A (en) * | 1994-03-16 | 1995-05-23 | Gregg Herron | Manual forklift pallet jack for unloading the contents of a beverage delivery truck |
| CA2158232C (en) * | 1994-09-14 | 2001-08-07 | Marcel-Claude Braud | Motor trolley with telescoping arm |
| FR2724374B1 (en) * | 1994-09-14 | 1996-10-25 | Manitou Bf | MOTORIZED HANDLING TROLLEY SUITABLE FOR EMBEDDING AT THE BACK OF A CARRIER VEHICLE |
| US5575604A (en) * | 1995-04-26 | 1996-11-19 | Teledyne Princeton, Inc. | Apparatus and method for mounting a forklift on a carrier |
| NL1001917C2 (en) * | 1995-12-15 | 1997-06-17 | Kooi Bv | Towable forklift truck assembly |
| FR2747082B1 (en) * | 1996-04-03 | 1998-05-15 | Manitou Bf | DEVICE FOR SOLIDARIZING A HANDLING TRUCK TO A TRUCK, SUPPORT CHASSIS AND TRUCK THEREFOR |
| US5879124A (en) * | 1997-04-14 | 1999-03-09 | Gerardus J. Brouwer | Vehicle with retractible rear wheel assembly |
| US6062800A (en) * | 1998-02-24 | 2000-05-16 | Eagle Picher Industries, Inc. | Forklift frame and mounting kit |
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| DE10004622B4 (en) * | 1999-10-30 | 2005-05-12 | Jungheinrich Ag | Counterbalanced trucks |
| US6530739B1 (en) * | 2000-09-12 | 2003-03-11 | Boris Fridman | Vehicle mounted forklift mounting system and a forklift and carrier using the same |
| US6572322B2 (en) | 2000-11-15 | 2003-06-03 | Cargotec, Inc. | Mounting system for truck mounted beverage handler |
| EP1829815B1 (en) * | 2006-03-03 | 2011-10-19 | O'Keeffe, Eric | A forklift truck |
| US20090035106A1 (en) * | 2006-04-10 | 2009-02-05 | U Box It, Inc. | Method of receiving and transporting solid waste |
| US7524159B2 (en) * | 2006-04-10 | 2009-04-28 | U Box It Inc. | Method of receiving and transporting solid waste |
| US8186931B2 (en) * | 2006-08-17 | 2012-05-29 | Steven Borntrager | Powered hand truck |
| US7597522B2 (en) * | 2006-08-17 | 2009-10-06 | Steven Borntrager | Powered hand truck |
| US7909112B2 (en) * | 2007-05-03 | 2011-03-22 | Decker Gordon Michael | Compact mobile fire attack vehicle mountable to an emergency vehicle |
| US7927061B2 (en) | 2007-05-23 | 2011-04-19 | Moffett Research & Development Limited | Mounting system for mounting a forklift on a vehicle |
| ES2408304T3 (en) * | 2007-05-23 | 2013-06-20 | Cargotec Research & Development Ireland Limited | Method for mounting a forklift in a vehicle |
| CN104444969B (en) * | 2014-11-26 | 2017-10-10 | 王马达 | Handling and fixing equipment and application method that guarantee simple forklift is run with container |
| GB201520624D0 (en) * | 2015-11-21 | 2016-01-06 | Billard Stéphanne | Cargo lift and transport device, and method of using same |
| EP3626675B1 (en) * | 2018-09-18 | 2022-01-19 | Terberg Kinglifter B.V. | Lifting truck provided with extended wheel arms, and method for loading and / or unloading a cargo space |
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|---|---|---|---|---|
| DE344168C (en) * | ||||
| DE468283C (en) * | 1928-11-10 | Hans Hochfeld Dr Ing | Electric conveyor cart with a platform that can be lowered to the ground | |
| DE403601C (en) * | 1922-08-22 | 1924-10-04 | Wilhelm Dahlheim | Shot ladder, especially for trucks |
| DE448550C (en) * | 1925-03-03 | 1927-08-22 | Robert Helms | Automatic loading and unloading device for trucks |
| US2395345A (en) * | 1942-09-10 | 1946-02-19 | Irvin F Schreck | Industrial truck |
| US2574045A (en) * | 1948-02-02 | 1951-11-06 | Sidney D Lapham | Fork lift truck |
| DE1431794A1 (en) * | 1951-01-28 | 1969-10-02 | Steinbock Gmbh | Industrial trucks, especially stacking devices for pallet loads |
| US2859890A (en) * | 1953-04-29 | 1958-11-11 | Th Pernin & Fils Soc | Mobile mechanical handling device |
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| US2943755A (en) * | 1958-09-16 | 1960-07-05 | Bygg Och Transportekonomie Ab | Lifting fork vehicles |
| DE1896075U (en) * | 1963-08-05 | 1964-07-02 | Friedrich Dipl Ing Rohrbeck | FORKLIFT. |
| US3302810A (en) * | 1964-08-13 | 1967-02-07 | Fred C Heidrick | Self-loading fork lift truck |
| AT247792B (en) * | 1964-12-23 | 1966-06-27 | Rohrboeck S Soehne Stahl Und E | Device for taking forklifts on transport vehicles |
| GB1074161A (en) * | 1965-03-09 | 1967-06-28 | Lansing Bagnall Ltd | Improvements in or relating to means for attaching a lift truck to a lorry |
| GB1092999A (en) * | 1965-03-09 | 1967-11-29 | Lansing Bagnall Ltd | Improvements in or relating to means for attaching a lift truck to a lorry |
| FR1449413A (en) * | 1965-10-08 | 1966-08-12 | Ernst Wagner Appbau Fa | Handling device |
| GB1147091A (en) * | 1967-04-13 | 1969-04-02 | Lockheed Aircraft Corp | Side loading apparatus for fork lift trucks |
| US3638961A (en) * | 1969-06-25 | 1972-02-01 | Blue Giant Equipment | Straddle assembly |
| US3695471A (en) * | 1970-05-15 | 1972-10-03 | William C Rivers Jr | Transport vehicle |
-
1973
- 1973-01-26 US US00326745A patent/US3799379A/en not_active Expired - Lifetime
- 1973-12-03 CA CA187,240A patent/CA1052325A/en not_active Expired
-
1974
- 1974-01-03 GB GB32574A patent/GB1455511A/en not_active Expired
- 1974-01-04 ZA ZA740083A patent/ZA7483B/en unknown
- 1974-01-14 BE BE139777A patent/BE809709A/en unknown
- 1974-01-14 NL NL7400447A patent/NL7400447A/xx not_active Application Discontinuation
- 1974-01-15 FR FR7401327A patent/FR2215380B1/fr not_active Expired
- 1974-01-15 AR AR251947A patent/AR200300A1/en active
- 1974-01-21 DE DE2402704A patent/DE2402704C2/en not_active Expired
- 1974-01-22 CH CH79574A patent/CH575339A5/xx not_active IP Right Cessation
- 1974-01-24 AT AT58774A patent/AT337602B/en not_active IP Right Cessation
- 1974-01-24 SE SE7400904A patent/SE385575B/en unknown
- 1974-01-25 FI FI213/74A patent/FI58317C/en active
- 1974-01-25 IT IT19813/74A patent/IT1007091B/en active
- 1974-01-25 JP JP49010315A patent/JPS49110067A/ja active Pending
- 1974-01-26 ES ES422642A patent/ES422642A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS49110067A (en) | 1974-10-19 |
| ATA58774A (en) | 1976-10-15 |
| AR200300A1 (en) | 1974-10-31 |
| ZA7483B (en) | 1974-12-24 |
| CH575339A5 (en) | 1976-05-14 |
| FI58317B (en) | 1980-09-30 |
| BE809709A (en) | 1974-05-02 |
| AT337602B (en) | 1977-07-11 |
| FI58317C (en) | 1981-01-12 |
| FR2215380A1 (en) | 1974-08-23 |
| ES422642A1 (en) | 1976-04-16 |
| FR2215380B1 (en) | 1978-03-10 |
| AU6480374A (en) | 1975-07-24 |
| GB1455511A (en) | 1976-11-10 |
| DE2402704A1 (en) | 1974-08-01 |
| SE385575B (en) | 1976-07-12 |
| IT1007091B (en) | 1976-10-30 |
| NL7400447A (en) | 1974-07-30 |
| US3799379A (en) | 1974-03-26 |
| DE2402704C2 (en) | 1982-04-01 |
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