US3581923A - Forklift trucks - Google Patents

Forklift trucks Download PDF

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Publication number
US3581923A
US3581923A US809217A US3581923DA US3581923A US 3581923 A US3581923 A US 3581923A US 809217 A US809217 A US 809217A US 3581923D A US3581923D A US 3581923DA US 3581923 A US3581923 A US 3581923A
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United States
Prior art keywords
accessory
carrying means
arms
wheel carrying
specified
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
US809217A
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English (en)
Inventor
Jean-Francois Archer
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Individual
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Individual
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Publication date
Priority claimed from FR78003492A external-priority patent/FR95052E/fr
Priority claimed from FR6906008A external-priority patent/FR2036134A6/fr
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Publication of US3581923A publication Critical patent/US3581923A/en
Anticipated expiration legal-status Critical
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    • 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
    • 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

Definitions

  • the object of the present invention is an auxiliary carriage arrangement which can be adapted to a conventional forklift truck with front-mounted forks, enabling it to be used as a side-lift truck.
  • the carriage or accessory in accordance with the invention comprises a longitudinal member to which there are fixed transverse supporting arms, means for fixing said supporting member perpendicularly to the forklift system of the truck, and at least two transverse arms each of which carries at least one pivoting wheel and are mounted to pivot, relatively to the supporting member, downwards into a position in which they are substantially parallel to the supporting arms, the pivoting wheels numbering at least three and being disposed in such fashion as to constitute a stable support for the carriage or accessory.
  • each of the two transverse arms, each carrying at least one pivoting wheel is assembled at the end of a mechanism which is designed to ensure that during the lifting of said accessory, on the one hand there is adequate limitation of the downward pivoting movement, and on the other hand the facility for pivoting towards the rear and upwards on the part of each of the arms, away from the longitudinal supporting member, thus making it possible to retract towards the rear and in the upward direction, the said pivoting wheels in order to enable transverse supporting legs which form a fork, to bear against the ground and, consequently, enable the loading and unloading of articles which, in particular, are located near the ground.
  • the accessory is associated with a terminal carriage designed to carry one end of a flexible load without interfering with the latters displacement, and comprising vertical members, preferably of detachable design, which define V-shaped openings in which the apex of the V is down-pointing, designed to accommodate the load.
  • FIG. 1 is a perspective view of a first embodiment of the accessory, fitted to a forklift truck;
  • FIG. 2 is aperspective view of the accessory of FIG. 1, disengaged from the forklift truck;
  • FIG. 3 is an elevational view of the accessory
  • FIG. 4 is an end view of the accessory
  • FIG. 5 is a view similar to that of FIG. 4, the accessory being fixed to the forklift mechanism ofa forklift truck, perpendicularly thereto and resting upon the ground;
  • FIGS. 6 and 7 are views similar to that of FIG. 5, after the accessory has been raised;
  • FIG. 8 is an elevational view of a detail of another embodiment
  • FIG. 9 illustrates the accessory in position ready to pick up a load at ground level
  • FIG. 10 is an elevational view of a detail of another embodiment
  • FIG. 11 is an elevational view of a detail of another embodimerit.
  • FIG. 12 is an elevational view of another embodiment
  • FIG. 13 is a perspective view of another embodiment suitable for direct attachment to the forklift mechanism of a forklift truck;
  • FIG. 14 is a fragmentary elevational view of another embodiment
  • FIG. 15 is a fragmentary elevational view of said same embodiment, seen from the rear in relation to the view of FIG. I4;
  • FIG. 16 is a perspective view of said embodiment, fitted to the forklift mechanism of a forklift truck;
  • FIG. 17 is a perspective view of a terminal carriage, those elements which are designed to carry the load, not having been shown;
  • FIG. I8 is a view similar to that of FIG. 17, the elements designed to take the load not having been shown.
  • the accessory in accordance with the invention is designed to be fitted to a forklift truck 1 of the conventional kind, comprising a front-mounting fork 2; the latter, in the conventional way, is fixed in an adjustable fashion to a mounting 3 which can be displaced vertically on a frame 4 by a mechanism which has not been illustrated; said frame is substantially vertical but may however be tilted slightly towards the rear in relation to the truck 1.
  • the accessory in accordance with the invention comprises a rail 6 upon which there are slidably mounted two terminal fork arms 7 and two intermediate fork arms 8.
  • the arms 8 are hollow and are spaced from one another by a distance equal to that separating the arms of the fork 2 so that the latter can be slid into the arms 8.
  • the rail 6 carries two uprights 9 which are connected with one another by a bar 10 acting as a pivot for two external arms 11; the latter arms are each equipped with an elongated hole 12 and are attached to one another by a crosspiece 13.
  • the dimensions of the openings 12 correspond to those of the arms of the fork 2 so that one of same can be passed through said openings as FIG. I shows.
  • a crosspiece 14 which externally connects the two arms 8, limits the pivoting of the arms 11 to a position in which the longitudinal axis of each of the openings 12 is substantially horizontal.
  • Each of the latter, in the conventional way, is pivotally secured at 19 to a yoke 20 which is itself mounted to pivot about the mounting 17, about a substantially vertical axis 21 which is offset to give the axis 19 a certain degree of trail.
  • the mountings 17 are applied against the adjustable arms 7 so that the accessory rests on its two wheels 18a and its two wheels 18b.
  • the two arms 11 are swung upwards and rest against the crosspiece 14, their openings 12 having their longitudinal axis substantially in the horizontal attitude.
  • the fork 2 of the truck 1 is raised to the level of the openings 12 and the truck displaced in order to enter one of the arms of the fork 2 into the openings 12 (FIG. 1); the rail 6 of the accessoryor auxiliary carriage 5, is then parallel to the arms of the fork 2. By slightly tilting the frame 4 towards the rear, the arm of the fork 2 is wedged into said openings.
  • the frame 4 When the accessory is in front of the rack, the frame 4 is returned to its initial position in order to release the fork 2, the truck 1 is disengaged from the accessory 5 and pivoted so that its fork 2 is perpendicular to the rail 6 (FIG. 2), the fork 2 is lowered in order to bring it to the level of the two hollow arms 8 and the truck I is then driven forward in order to enter the arms of its fork 2 into the arms 8 (FIG. 5). During this movement the panel 3 hits the arms 11 and causes them to pivot forward.
  • the fork 2 is then lifted, carrying with it the accessory 5 (FIG. 6).
  • Each of the mountings 17 pivots about the axis so that it adopts a virtually vertical position and is retracted beneath the accessory 5 (FIG. 7).
  • each of the latter may comprise two openings 12a and 12b (FIG. 8) at a certain vertical interval from one another.
  • each of the arms 11 will preferably be sloped or rounded, as indicated at 11a (FIG. 4), in order that it shall be properly deflected by the panel 2 and that no jamming ofthe arm can take place.
  • the arms 7 and 8 are normally located at a certain distance above the ground.
  • the accessory 5 In order to enable the accessory 5 to carry loads which are located very close to the ground, in the manner shown in FIG. 9 it is possible to provide means which enable the mountings to swing towards the rear, their wheels 18a and 18b then pointing upwards.
  • These means can be constituted, advantageously, by a chain 22 one end of which is fixed to the rail and can be engaged by a hook 23 fixed to the end of the mounting I7 and facing downwards.
  • the accessory 5 Before picking up the load, the accessory 5 is raised, the mountings 17 are swung towards the rear and the chains 22 are hooked onto the hooks 23 enabling the forks 7 and 8 to engage beneath the load.
  • the driver may return the mountings 17 to their normal positions without getting down from the truck. All that he has to do is to first of all lower the fork 2 so that the wheels 18b hit the ground; the mountings 17 then pivot a little further so that the chains 22 have become slack and disengage from the hooks 23. Then, he raises the fork 2 again so that the mountings 17 adopt the position shown in FIG. 7, and then lowers it until the wheels 18a are resting on the ground.
  • the picking up of a load located at a small distance above the ground may be something which is difficult to carry out in certain circumstances.
  • the forks 7 and 8 have to be placed at a height such that the wheels 18b rest on the ground. If these wheels are badly aligned, i.e. are located crosswise for example, then the truck 1 cannot back.
  • means can be provided to keep the mountings 17 pivoted towards the rear. These means may be similar to those illustrated in FIG. 9, the chain 22 being fixed for example to the mounting 17 using eg a plate which is secured to the mounting and equipped with a slot which is engaged between two links of the chain.
  • the wheel 18b moves towards the rack.
  • the axis 19 thereof is located in front of the axis 21 of the yoke 20.
  • the yoke 20 therefore tends to pivot through I so that the axis 19 trails the axis 21.
  • the wheel 18b is transversely located and parallel to the rail 6. It may jam in this position, with some risk of damage to the accessory.
  • FIG. 10 shows the yoke 20 can be fitted with a counterweight 25 which keeps the yoke in a position in which the axis 19 trails the axis 21.
  • the yoke 20 can equally well be arranged to pivot in an auxiliary mounting 26 which is itself pivotally secured to the mounting l7 and swings about a horizontal axis 27 provided at the end of said mounting 17 (FIG. 11).
  • the axis 21 is vertical or at least within a few degrees, so that there is no risk of any jamming during the movement of pivoting of the yoke 20 around said axis.
  • the yoke 20 of the external pivotable wheel 18b can be arranged higher than the one for the internal wheel 18a (FIG. 12).
  • the width of the corridor or gangway in which the load to be picked up is located must be at least equal to the length of the truck 1 plus the length of the fork 2 and the width of the accessory 5.
  • one of the hooks 28 is engaged in the eye 31.
  • the bar 30 comes up against the panel 3 and keeps the accessory 5 parallel to the truck 1 by preventing it from pivoting towards the rear.
  • the crosspiece 14 comes up against the panel 3 and maintains the accessory 5 in its correct position.
  • FIGS. 14 to 16 The accessory illustrated in FIGS. 14 to 16 is likewise designed for use with a forklift truck 1 of conventional kind, with a front-mounting fork 2 which, in the usual way, is secured in an adjustable manner to a panel 3 which can be vertically displaced upon a frame 4 by a conventional mechanism (not shown); said frame 4 is substantially vertical but may nevertheless be tilted slightly towards the rear in relation to the truck 1.
  • This accessory or auxiliary carriage is again designated in toto by the reference 5, and comprises a rail 6 to which there are fixed two intermediate fork aims 8. These arms 8 are hollow and are spaced from one another by a distance equivalent to that separating the arms of the fork 2, so that the latter arms can be inserted into the arms 8.
  • the rail 6 carries two uprights 9 which are connected to one another by a bar 10 acting as a pivot for two external arms 11.
  • the arms 11 contain for example two openings 12a and 12b spaced at a vertical interval from one another.
  • each upright 9 There is rotationally mounted upon each upright 9, through the medium of two lugs 33 and 34 secured to each upright, a sloping pivot 32.
  • the top lug 34 is longer than the bottom one 33 and is offset in relation thereto towards the rail 6 so that the pivot 32 is inclined both outside in the longitudinal direction of the rail and towards the front, towards said rail.
  • the pivot 32 is secured'to a bar 35 to which there are articulatingly connected at 36 and 37, with one of their ends in each case, two levers 38 and 39 respectively. At their other ends, the levers 38 and 39 are articulated, at 40 and 41, to an upright 42.
  • each upright 42 is secured to a transverse mounting or wheel carrying means 43 for two pivotable wheels 1811 and 18b.
  • Each of these wheels in the conventional way, is pivotally mounted at 19 in a yoke 20 which itself is pivotally fixed to the mounting 43 in order to be able to swing about a vertical axis which is offset in relation to the axis 19 to give a degree of trail.
  • the mountings 43 are applied against the underside of an auxiliary rail 6a which is parallel to the rail 6 and in contact with a bottom ridge upon which there is a sloping stop 44 fixed to the top face of each mounting 43, this in order to lock each of said mountings in position.
  • the two arms 11 are swung towards the rear and rest against the crosspiece-14.
  • the fork 2 of the forklift truck 1 is raised to the level of an opening 12b in an arm 11, and the truck 1 is displaced by tilting its frame 4 towards the rear so as to obliquely enter one of the arms of said fork 2 into the opening 12b in one arm 11 and in the opening 12a of the other arm 11.
  • the rail 6 is thus substantially parallel to the direction of forward movement of the forklift truck and, by causing the frame 4 to tilt slightly backwards, the arm of the fork 2 is made to wedge into the openings 12b and 12a in the arms 111.
  • the frame 4 When the accessory 5 is in front of the rack, the frame 4 is moved back into the vertical position in order to liberate the arm from the fork 2, and the truck l is then disengaged from the accessory 5. Following this, the truck 1 is maneuvered so that its fork 2 is perpendicular to the rail 6 and, after lowering the fork, it is slid into the two arms 8. During this movement, the panel 3 hits the arms 11 and causes them to swing towards the front.
  • the fork 2 is'then lifted which in turn lifts the accessory 5.
  • the mountings 43 and the levers 38 and 39 pivot, on the one hand in the downward direction, this movement being limited by contact between an extension 45 on the lever 38 with the top face of the corresponding mounting 43.
  • the mountings 43 and the levers 38 and 39 on the other hand pivot towards the rear and upwards, about the oblique pivot 33, this movement being helped by the tilting back of the frame 4.
  • the mountings 43 and the levers 38 and 39 are locked in position by some suitable means and the wheels 18a and 18b are retracted behind the plane defined by the transverse arms 8 when the frame 4 is substantially in the vertical attitude.
  • the stop 44 which is in engagement with the bottom ridge on the rail 6a, because of the application of the load, locks the mountings 43 against said rail 6a, the latter carrying at the rear the upright 42 and a second upright 46 adapted to act as an additional stop parallel to the former upright 46 and adjacent thereto.
  • the fork 2 is then disengaged from the arms 8 by backing the forklift truck 1 out, and is then raised to engage it in the openings 12b and 12a in the arms 11 as hereinbefore described, the arms 11 being tilted backwards during the disengagement of the fork 2. it is then possible, by means of the truck 1, to move the accessory 5 to the desired location, together with the load of articles it is carrying, and finally to unload these articles for example by introducing the arms of the fork into the arms 8.
  • FIGS. 14 to 16 may comprise the features described in relation to the earlier FIGS. and in particular:
  • FIGS. 17 and 18 illustrate a terminal carriage or accessory, comprising a frame made up of two rails 47 connected to one another by top crosspieces 48 and bottom crosspieces 49, said crosspieces terminating at one of the rails but overhanging the other.
  • a plate 50 is fitted at each of the ends of each crosspiece.
  • This plate serves on the one hand as a bearing for the vertical pivot of the yoke 51 for a pivotable wheel 52, and on the other hand as the mounting for an upright 53.
  • the two upright 53, situated at one and the same end of the rails 47, are connected together by a crosspiece 54.
  • Each of the uprights 53 is constituted by two profiled sectionswhich are connected with one another by a plate 55 on the external face, and which are spaced slightly apart so that between them a vertical gap 56 disposed perpendicularly to the rails 47, is formed.
  • the crosspieces 54 are designed in a similar way and also define a horizontal gap 57 which is located in the same vertical plane as the neighboring gaps 56.
  • each of the gaps 56 there can be introduced the external vertical edge of a fillet 58 the internal edge of which slopes.
  • the fillet is provided at the top, on its external face, with a portion 58a of hooked form which embraces the corresponding plate 55, thus limiting the downward displacement of the fillet.
  • the fillets 58 define between them V-shaped openings 59 the apex of the V being directed downwards and being located in the neighborhood of the crosspieces 54.
  • each of its ends is located in one of the openings 59 of such a carriage or accessory, where they jam in position.
  • the load is thus automatically secured to the terminal accessories so that when displaced by means of the auxiliary carriage or accessory hereinbefore referred to, the terminal accessories displace at the same time without any sliding taking place between load and accessory.
  • a device which enables the terminal accessory to be secured to the fork of a forklift truck.
  • each of the crosspieces 48 and 49 contains, in the neighborhood of the uprights 60, one or more holes 61 in which a pin 62 can be inserted.
  • This pin and the adjacent upright 60 determine a passage 63 into which there can be inserted one of the arms 2 of the fork 5 of the forklift truck 1, enabling the latter to drive the terminal accessory.
  • the width of the opening 63 can be adapted to that of arms 2.
  • a link chain 64 can be provided, one end of which is anchored to the terminal accessory whilst the other end is secured to the truck after having wound it around one of the arms 2.
  • the fixing can be produced for example by threading the chain through a slot 65 in one of the uprights 60.
  • each of the ends of the rails 47 contains two holes 66.
  • two hooks 67 which are fixed to one and the same plate 68.
  • the two terminal accessories can be secured to one another by slipping one of the hooks 67 into a hole 66 in a first accessory, and the other hook 67 into a hole 66 in the second accessory. If the rail 6 of the basic accessory or auxiliary carriage, contains holes arranged in the same way as the holes 66, then likewise the system of terminal accessories can be linked to the main accessory and the three accessories thus simultaneously driven back to the point of departure to pick up a new load.
  • An accessory for use with a truck having a forklift and a lifting panel associated therewith comprising at least one rail member and a plurality of supporting arms attached to said rail member, means for mounting the said rail member on said panel, a plurality of wheel carrying means associated with said rail member, a plurality of wheels being carried by said means in pivotable relation thereto, means for mounting said wheel carrying means in pivotal relation to said rail member to permit movement of said wheel carrying means from a first position in which said wheels are adapted to support said accessory on the ground to a second position in which said wheel carrying means are at an angle to said rail member.
  • the accessory specified in claim 1 further comprising a plurality of external arms pivotably mounted on said accessory, said external arms each having at least one opening therein for receiving said forklift to render said accessory moveable along and in contact with the ground.
  • each of said external arms has two openings therein.
  • said means for mounting said wheel carrying means comprises at least one link fixedly mounted to said wheel carrying means and pivotally mounted on one of said arms to permit said wheel carrying means to pivot downwardly and out of the way of said arms.
  • said means for mounting said wheel carrying means comprises a pivot, a pair of lugs rotatably mounted at each end of said pivot, a pair of levers one end of said levers being mounted on said pivot in articulated manner and the second end of said levers being mounted on an upright post also in articulated manner, said upright post being fixedly mounted on one of said arms, said arm having one of said wheel carrying means mounted thereon, said lug, levers and upright post together comprising a parallelogram linkage, said pivot being mounted at an angle to said rail to ensure pivoting of said wheel carrying means upwardly and to the rear of the said accessory, and means for locking the wheel carrying means in the pivoted position.
  • the accessory specified in claim 8 further comprising a sloping stop mounted on the said wheel carrying means in position to engage said rail member and lock said wheel carrying means in a supporting position with the wheels on the ground.
  • one of said lugs is longer than the other said lug and offset therefrom with the longer lug in position closer to said rail.
  • the accessory specified in claim 9 further comprising a second upright post adapted to act as an additional stop.
  • the accessory specified in claim 1 further comprising a plurality of rings mounted on said rail member and adapted to engage hooks secured to said lifting panel on the forklift truck.
  • the accessory specified in claim 13 further comprising an extension which terminates in an eye which is adapted to engage a hook fixed on the panel of said forklift truck.
  • said wheel carrying means includes a yoke for mounting each wheel, the yoke farthest from said rail member being shorter than the other yokes.
  • the accessory specified in claim 1 further comprising means for maintaining said wheel carrying means in a pivoted position with said wheels facing upwards.
  • said means for maintaining said wheel carrying means in a pivoted position comprises a chain which is secured to said rail member and a hook which is secured to said wheel carrying means for engagement with said chain.

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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)
  • Handcart (AREA)
US809217A 1968-03-29 1969-03-21 Forklift trucks Expired - Lifetime US3581923A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR78003485 1968-03-29
FR78003492A FR95052E (fr) 1968-03-29 1968-04-10 Chariot auxiliaire permettant d'utiliser un chariot élévateur a fourche frontale comme chariot élévateur a fourche latérale.
FR6906008A FR2036134A6 (fr) 1969-03-05 1969-03-05

Publications (1)

Publication Number Publication Date
US3581923A true US3581923A (en) 1971-06-01

Family

ID=27249086

Family Applications (1)

Application Number Title Priority Date Filing Date
US809217A Expired - Lifetime US3581923A (en) 1968-03-29 1969-03-21 Forklift trucks

Country Status (8)

Country Link
US (1) US3581923A (fr)
JP (1) JPS4947391B1 (fr)
BE (1) BE730046A (fr)
CH (1) CH484827A (fr)
DE (1) DE1916223A1 (fr)
GB (1) GB1231773A (fr)
NL (1) NL6904825A (fr)
SE (1) SE333052B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951276A (en) * 1973-06-07 1976-04-20 Champion International Corporation Handling and dispensing system and apparatus for cylindrical objects
US4004701A (en) * 1973-06-07 1977-01-25 Champion International Corporation Handling and dispensing system and apparatus for cylindrical objects
US4129223A (en) * 1977-09-22 1978-12-12 Robil Company Bundle carrier attachment for fork lift trucks
US5161933A (en) * 1988-03-16 1992-11-10 Sft Ag Spontanfordertechnik Apparatus for handling heavy loads
US20060285960A1 (en) * 2005-06-09 2006-12-21 Hitchcock Jeff S Forklift attachment
US9505595B1 (en) * 2015-11-06 2016-11-29 James Nelson Smith Rapid delivery pallet jack system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951276A (en) * 1973-06-07 1976-04-20 Champion International Corporation Handling and dispensing system and apparatus for cylindrical objects
US4004701A (en) * 1973-06-07 1977-01-25 Champion International Corporation Handling and dispensing system and apparatus for cylindrical objects
US4129223A (en) * 1977-09-22 1978-12-12 Robil Company Bundle carrier attachment for fork lift trucks
US5161933A (en) * 1988-03-16 1992-11-10 Sft Ag Spontanfordertechnik Apparatus for handling heavy loads
US20060285960A1 (en) * 2005-06-09 2006-12-21 Hitchcock Jeff S Forklift attachment
US9505595B1 (en) * 2015-11-06 2016-11-29 James Nelson Smith Rapid delivery pallet jack system

Also Published As

Publication number Publication date
NL6904825A (fr) 1969-10-01
SE333052B (fr) 1971-03-01
GB1231773A (fr) 1971-05-12
CH484827A (fr) 1970-01-31
BE730046A (fr) 1969-09-01
JPS4947391B1 (fr) 1974-12-16
DE1916223A1 (de) 1969-10-16

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