DE2121114A1 - Additional device for forklifts for use in narrow hall aisles - Google Patents

Description

PATFNTANFVSLTE
DR. ING. Κ / ". EOJHMERT

DIPL-IKG. A =. "F 3Cf-IMERT -> 1 O <l 14 /

2b 3r.u * ... u. FiiLDSTiL 24 ZIZI Il 4

) V 4Ü 44

A 1154 Bremen, April 29, 1971

ATJDERSON CLAYTON & COMPANY P.O.Box 2538, Houston, Texas 77001, U. S. A.

Additional device for forklifts for use in narrow hall aisles

The invention relates to an attachment for industrial forklifts and especially for narrow or narrow hall aisles, so that the forklift truck can handle loads or stacking plates both is suitable to the front as well as to the sides without having to turn the vehicle in the narrow hall aisle.

Such devices, ■ by means of which it should be possible The use of forklift trucks for working to the sides are already described in US Pat. Nos. 2,851,182, 2,975,923 and 3,166,209 has been described. However, the levers and pivots of this and similar prior art arrangements extend in the Generally from the forklift so far forward that the load capacity of the forklift is reduced. Most of the known Devices use linkages and guide arrangements, which are wider than the normal, front support plate of the truck, so that the attachment is wider than would be desirable.

It is therefore an object of the invention to provide an attachment for forklift trucks to create by means of which the forklift is able to load Laston and stacking plates both in front and to the side

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to allow the forklift; the invention also relates to a improved method of actuating a six-link articulation mechanism with arms crossed.

According to the invention, this object is achieved by an additional device for forklift trucks, which comprises a six-link articulation mechanism with crossed arms, which is rotatable is arranged on a load-bearing column, which is attached to a telescopic

Fe pisch working release device is grown. By means of this six-link mechanism with crossed arms the face plate, on which a fork, gripper or other device are attached, can be rotated by 90 on both sides of the vehicle, or can be brought into a normal fork lift position. The braided rod mechanism with crossed arms makes it possible it is also possible to accommodate the entire rotating mechanism on a smaller width than that of a normal front plate of a forklift truck, so that the pivot points remain within the standard width of a forklift's faceplate. The load bearing column includes a

W Balancing device to prevent the front plate _and linkage from twisting when a load is picked up from the front or one side. The telescopic release mechanism allows the load-handling devices to be positioned on the faceplate so that they can be operated across the vehicle when the faceplate is in its normal position and the faceplate can be moved over the sides of the vehicle on both sides when it is pivoted 90 degrees off the axis of the vehicle.

The additional device according to the invention is constructed so that them on a normal support plate of a normal forklift truck

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can be grown. The invention works best in context with a vehicle comprising a lifting mechanism, but additional Release devices on the year equipment are not necessary. The narrow profile of the additional device when viewed from the front prevents one Excessively large loss of load capacity.

Further features and advantages of the invention emerge from the following, exemplary description based on the accompanying drawings.

Show it:

1 to 7 are schematic plan views of the subject matter of the invention when pulling out a stacking plate from the hall aisle next to.

the forklift,
Fig. 8 is a diagram showing the handling of a loaded one

Stacking plate from the hall aisle, similar to Fig. 4, 9 shows the overall design of the subject matter of the invention

Graph,
Fig. 10 is a front view, in part, of the article of the invention

Cross-section,
Fig. 11 is a partial cross-section along the line 11-11 in Fig. 10;

Fig. 12 is a side elevation along line 12-12 in Fig. 10; Fig. 13 is a partial cross-section along line 13-13 in Fig. 10

<Tig. 12
Fig. 14 is a cross section taken along line 14-14 in Fig. 12th

In all the figures, parts that correspond to one another are identified by the same reference symbols.

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Referring to the drawing and in particular to FIGS. 1 to 7, 10 is generally an auxiliary device for operation in narrow hall aisles, which is arranged on a fork lift truck 12 which is known per se. The additional device 10 comprises an end plate 14, in this case an additional support plate for tools for a normal industrial forklift truck, on which the usual forks are arranged. Other, per se known, load-gripping and handling devices can also be attached to this end plate W , or the same can be adapted to its intended use in a manner known per se.

Next to the front and to the left of the stacker 12 is a normal support plate or pallet 18 on which various loads can be placed. In particular, FIG. 1 shows that the axis of the additional device 10, the center line of the forks 16 and the center line of the stacker 12 are aligned with one another. The support plate 18 can stand on the floor, or be arranged above the floor on a support plate frame or on another load. It is the hand on W that the auxiliary device 10 must be lifted by the stage of ■ the forklift, so that the forks 16 can engage in the specific areas to the support plate.

The illustration in FIG. 2 shows the additional device 10 and the forks 16 moved to the right so that the center lines no longer coincide with that of the vehicle. As described below, the movement into the outermost lateral position releases the lock which holds the plate 14 on this side on the additional device 10, so that the additional device swivel plate 1 ^ in the opposite direction can. In the illustration according to FIG. 2, the movement triggers

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the plate 1 * l · and the additional device 10 in the outermost position on the right the lock on the right side, so that the additional device 10 can pivot the plate 1 * f to the left, as in FIG. 3 represented by dotted, dashed and solid lines is. The steps for pivoting the plate and forks in the opposite direction are exactly the opposite.

The plate 1 * f shown in solid lines in FIG and forks 16 are not aligned with support plate 18. Of the The operator of the vehicle now drives it forwards or backwards until the forks are in the correct position to move into the to be able to intervene in the stacking plate 18 for spaces intended for them. Then the pivoted faceplate 18 is moved to the left and the Forks engage in the trees of the stacking plate 18 which are intended for this purpose. It should be noted here that the forks 16 are not in the stacking plate are centered, as the adjacent edge of the stacking plate must pass the frame of the additional device when the stacking plate is removed from the forklift 12 is grasped and lifted from the bearing point, as shown in FIG. 5.

As shown in FIG. 6, the plate 1k is now moved completely to the right and then, as indicated by the fully extended, dashed and dotted lines in FIG. 6, pivoted until the plate 14 points forward. If there is a stacking plate that is too deep, it may be necessary to move the truck so far backwards that the Ka _ts of the stacking plate on the removed lying corner of the room passes, on which the stacking plate was stored when the operations shown in Figure 6 are performed.

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The plate Ik is then moved back to the center so that the various center lines again coincide with one another, as shown in FIG. 1. If it is necessary to center the pallet exactly, the vehicle can be moved to the left from the side of the storage zone, whereupon the pallet can be moved by means of the release mechanism in a manner known per se. Erwtinschtenfalls the stacking plate may, however, also be transported on the forklift in the pivoted to the driving direction by 90 position, that is, in the embodiment shown in Figure 3 position. Loads that are wider than the width of the doors can of course also be transported parallel to the direction of movement of the vehicle (as in FIG. W).

Figure 8 shows the auxiliary device for narrow passages in a position which substantially corresponds to the k of FIG. Here, however, the plate Ik does not include the forks 16, but also a cardboard cover attached to the plate 1 * f. FIG. 8 also illustrates the use of the additional device 10 for narrow hall aisles on a forklift 12 for handling a stacking plate above the floor. Here, the additional device 10 is installed on the normal, two-piece tool plate 22 of the forklift. This plate is moved vertically by the elevator 2k- in the normal manner.

Figures 10, 11 and 12 show the attachment 10 for narrow hall aisles in detail. The attachment 10 generally comprises a six-link rod 26, a release mechanism 28, a load-bearing column 30 and locks 32. In general, the six-link linkage supports the plate Ik and swivels the same, whereby the devices applying the load, such as the forks 16,

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are grown on the plate Ik. The SSuIe 30 in turn supports the linkage 26 and prevents its twisting by means of a balancing device. The deployment mechanism 28 supports the load-bearing SSuIe and cooperates with the locks 32 to enable the six-link linkage 26 to pivot. The base plate of the release mechanism is in turn arranged on the normal plate 22 of the forklift truck 12.

The six-link linkage comprises the load-bearing SSuIe 30, the plate 14 and two pairs of symmetrically arranged arms 3 ** ·, 36 and 38, kO _m The SSuIe 30 comprises consoles kZ and Vf, which are arranged symmetrically, with pivot pins 46 the inner arm J> k and pivot k8 pivotably support the inner arm 36 above and below. Pivots 50 allow pivoting movement between arms 3k and 38, and pivot pins 52 similarly connect arms 36 and kO at the top and bottom. Pins 5k connect and allow the pivoting movement of the face plate 14 and the outer arm 38 and pins 56 connect the plate 14 and the outer arm kO in a similar manner. As can best be seen from FIGS. 11 and 12, the pins 5 and 56 are not coaxial but offset from one another in such a way that when the plate 14 is parallel to the stacker plate 22, the arms 38 and 40 cross one another. The Ik plate therefore forms part of the six-part structure.

It can be seen that the six-part linkage has six individual parts wherein the ends of each element are pivotally connected to the ends of the next element. In contrast to well-known However, two of the pieces cross each other; the novel Effect of the subject invention is at least partially due to this arrangement.

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To move and control the pivoting movement of the arms are propulsion means between the load-bearing column 30 and the inner ones Arms 34 and 36 arranged. These drive means include hydraulic ones Pistons 58 and 60. As can be seen from Figure 9, the Piston 58 is pivotable by pin 62 with column 30 and through a pin 64 connected to the arm 34. Similarly, the Piston 60 is pivotable through a pin 66 with the SSuIe and through a pin 68 is connected to the arm 36. The pistons 58 and 60 are double-acting pistons and are operated hydraulically.

The extension of the piston 58 causes the arm J> k to pivot outward from a position on the frame 70 of the additional device 10 into a position which is essentially somewhat more than perpendicular to the frame, as shown in FIG. 11. The extension of the piston 60 in turn causes the arm 36 to pivot outward from a position lying on the frame 70 into a position slightly above the position perpendicular thereto (FIG. 11). The pistons are extended simultaneously so that the arms collide in the manner shown in FIG. 11. Retraction of the pistons causes the arms 34 and 36 to pivot about the pins 46 and 48 until the pivot pins 50 and 52 are adjacent to the frame 70. As will be described below, when the plate 14 is adjacent the frame 70 and the catches 32 are engaged, the pistons 58 and 60 cannot be actuated.

The plate 14 has a lock 32 at each end. These locks engage roller locks 72 and 74. The roller lock 72 is provided on the outer arm 38 adjacent the pivot 50 while the roller lock 74 on the outer arm 38 adjacent the pivot pins 52 is mounted. When the faceplate 14 is parallel to the frame 70 (ie.

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is next to the additional device 10 according to FIG. 1), the two locks 32 on both sides of the plate 1 * f are in engagement with the corresponding roller locks 72 and 7k. If, however, the end plate 14 is to be pivoted to the left, as shown in FIG the arm 38 is held.

It can be seen from FIG. 13 that the roller lock 72 is attached to the arm 38 is. The plate extends backwards from the plate Console 75 »to which a cam 76 is pivotably attached. the Cam 76 prevents the movement of the roller lock 72 and thus holds the plate 14 next to the arm 38 firmly. An operating lever is attached to the cam 76 7 & provided ^ which the cam in the direction of the drawn Can rotate arrow to release the lock 72. The cam 76 is biased e.g. by a spring or a rubber block and .normally held in the position shown in FIG. The symmetrical arranged for this lock at the other end of the plate 14 is in FIG. 11 is identified by the same reference numerals with a dash (*).

On the surface of the frame 70, racks 80, 82 are provided above and below, respectively. These racks 80, 82 mesh with pinions 8 * f, 86 which are arranged on the ends of a shaft 88. The shaft 88 is mounted in the column 30. On top of the SSuIe 30 are rollers Sk ₁ which engage in a guide 96 along the lower surface of the frame 70. Rollers 98 are provided vertically behind the column 30 (dashed lines in FIG. 12), which run in a guide 100 of the frame 70. The rollers 98 support the column 30 in the vertical

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Cal direction while the rollers 90 and Sk hold the SSuIe on the frame 70.

The racks 80 and 82 cooperating with the pinions 8k and 86 act as a balancing device to prevent twisting of the SSuIe 30 from the vertical when loads are handled by the tools placed on the plate 14.

The release mechanism 28 in this case is a telescopic device with primary and secondary hydraulic pistons for the optional adjustment of the SSuIe 30 transversely to the front of the forklift 12. The secondary pistons are in response to greater resistance actuated against the movement and represent a further development of the subject matter of the invention, which somewhat extends the operating range and can also be omitted if less maneuverability can be assumed. Others, giving an equivalent movement Devices can be provided.

Referring to Figure 10, the primary deployment mechanism includes one therein Trap engine formed by two pistons 102 and 10 ^. Everyone who piston 102 and 1CA- shown is a single-acting piston, wherein the cylinders with ends pointing in opposite directions at the Frame 70 are grown. On the piston rod 106 of the piston 102 a sprocket 109 is attached, and on the piston rod 110 of the Piston 104 · a sprocket 112. On opposite sides of the Frame 70 is provided next to pistons 102 and 1C & a chain 114, which runs over chain wheels 108 and 112. The fcette can be on one or at both ends at which it is attached to the frame 70 with Adjustment means II6 be provided. The middle of the chain 114 is through a bracket II8 is attached to the load-bearing SSuIe 30. To the

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Pistons 102 and 1 (Ä lead suitable hydraulic lines. The entry of the pressure medium into the piston 102 causes the piston rod 106 to exit and the chain 11 * f to revolve over the sprocket 108 in the direction of the arrow, in such a way that the console 118 and with this also the sleeve 30 is moved in the same direction in which the piston rod moves, but twice as fast as a result of the mechanical transmission. When the piston 1 is actuated, the same movement takes place, but in the opposite direction moves across the front wall of the frame 70 and rests on the bolts 90, 9k and 98. This in turn moves the six-link rod 26 across the front wall of the frame 70 - is perpendicular to the frame 70. The plate 14- can be moved to the edge of the frame 70 by means of the primary release mechanism described above.

In addition, it may be desirable to have the frame 70 itself disengageable to design in order to make the forklift according to the invention more mobile to design. This is done through the secondary deployment mechanism. An intermediate frame 120 is located between the frame 70 and the support plate 22 of the fork lifter (see FIG. 12). The intermediate frame 120 has an upper bracket 122 and a lower bracket 124, which are fixedly attached to the front support plate 22. A Z-shaped support 126 is between the upper bracket 122 and the frame 70 arranged and supports the frame 70 so that he can slide on the upper console. A vertical support 128 serves a similar purpose between the frame 70 and the lower bracket 12 * l ·. Extends from the upper bracket 122 of the intermediate frame 120 a pin up through a slot 132 in the frame 70 (Ilg.1i).

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Secondary drive means, in this case all secondary pistons 13 ^ and 136 are arranged between the frame 70 and the pin 130. A End of each piston is attached to frame 70 and the other actuating end on pin 130. Actuation, e.g. of piston 13 ^ »causes the sliding of the frame 70 away from the pin 130, which is firmly on the support plate 22 of the forklift through the upper bracket 122 is. In this way, the frame 70 in move its whole over part of the surface of the support plate 22, whereby the working range of the release device is enlarged. The pistons are hydraulically operated in a manner known per se.

As already noted, the plate wirÄ lh in a position parallel to the support plate 22 of the truck is moving, when the inner arms are pivoted century and 36 adjacent the frame 70th In this position, the locks 32 lock with the corresponding roller locks 72 and 7 ^ · on the outer arms 38 and 4-0. To release one of the locks 32, it is necessary to operate the lever 7β retracting the cam 76 in the manner already described. Roller arms 140 and 1 ^ 2 are provided on frame 70. When the locks 32, which are provided on the two arms 38 and * fO, are brought into one of the two end positions on the edge of the frame 70, the levers 78 ^{or 78 1 act on} the arm 14O or 1 ^ 2, and the corresponding lock is released. When the pistons 58 and 60 are then actuated, the inner arms 3 ^ and 36, as well as the outer arms 38 and h0, are rotated so that the plate 14- is positioned perpendicular to the additional device 10. Centering springs 138, which engage with the intermediate frame 120, are arranged on both sides of the frame 70. The purpose of these springs is to provide some resistance to the release of the locks and frame 70

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to partially center against the intermediate frame 130 when the Do not frame 70 against the intermediate frame at the end of its path should remain.

It can be seen from FIG. 11 that the arrangement by which the arms cross or overlap offers the possibility of bringing the plate 14 into a position perpendicular to the frame 70. If the pivot points 5 ^ and 56 were coaxial, the plate 14 could only assume a position parallel to the arms 38 or 40, but none of the arms would be perpendicular to the frame. Use of the crossed arms eliminates the need to use some drive mechanism to erase disk i4. If, in addition, the arms J> k and 36 are pivoted so that they lie next to one another and the frame is blocked either on the arm 38 or on the arm kO , this is not a freely movable four-membered structure between the points 50, 52, 5 ^ and 56. Linkage, but two rigid three-link linkage that crosses one another.

It should be noted that there is no physical connection between the arms J> K and 36 on the one hand and between the arms 38 and kO on the other hand in order to achieve a symmetrical rotational movement and alignment, because the rotational movement is not symmetrical. Typically, a six-link linkage is viewed as not pre-determinable, while a four-link linkage is considered pre-determinable. According to the invention, however, the beginning and the end of the rotary or pivoting movement are controlled, and the starting and ending positions can therefore be predetermined, which leads to the movements already described.

The invention therefore provides an attachment for forklift trucks which in particular for handling loads in front of the forklift and

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on its side of the same.

The method according to the invention results from the preceding one Description of the construction of the forklift according to the invention and generally comprises the adjustment of two links of a six link Linkage in such a way that these links cross each other and a link is therebetween, the intermediate links selectively locking against the crossing arms will.

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Claims (8)

21211U - 15 - PATENT CLAIMS 1. J accessory for industrial forklifts, and in particular Narrow or narrow hall aisles, suitable for handling loads or stacking plates both in the front and to the sides without having to turn the vehicle itself in the narrow hall aisle, characterized by a load-supporting SSuIe (30), an inner pair of symmetrically arranged arms (34,36) which are pivotally attached to the SSuIe (30), a outer pair of generally symmetrical arms (38,40) which are pivotally attached to the ends of the inner arms (3 ^, 36), and the cross each other, a plate (1A-) pivotally attached to the outer pair of arms, load-applying means (16) to be attached to the plate (1 * 0), the SSuIe (30), the arms (34,36,38 , 40) and the plate (1 ¹ O a pivotable, six-link linkage (26), pivot means (46, 48, · ..) which mechanically connect each of the inner arms and the SSuIe (30) to the arms opposite the SSuIe to pivot, locks (32; 72,74), which optionally ax a sweet arm the plate (14), means (76) for selectively actuating the locks, Ausrttckmittel (28) for supporting the SSuIe for selectively moving the column across the stacker (12) and means (102,104; 134,136) for the optional actuation of the release means (28). 2. Additional device for forklifts according to claim 1, gekennzeiehnet by balancing means ((80,82,84,86) for connecting the load-bearing SSuIe (30) and the Ausrttckmittel (28) to a relative twisting between these two parts to prevent an inner pair of symmetrical arms (34,36) which can be pivoted on the column (30) 209825/0583 21211 U. are attached and form two links of the six-link linkage, an outer pair of substantially symmetrical arms (38,40), which are each pivotably connected to an inner arm (34 or 36) and two further links of the six-link linkage form, a member that applies the load and forms a member of the six-membered linkage, with the outer pair crossed by arms and pivotable with the one applying the load Link is connected, the locks (32,72,7 * 0 optionally the Susseren Arms connecting the load applying member and comprising means (76) for releasing the locks and means for pivoting the Links (e.g. 50,52,54,56) * 3 additional device for forklift truck according to claim 1, characterized in that in that the pivoting means comprise hydraulic motors (58,60) arranged between the column (30) and each inner arm (34 and 36) are. 4. Additional device ftfr forklift according to claim 1, characterized in that the lateral working Ausrtfckmittel (28) primary Means (102,104). 5 · Additional device fttr forklift according to claim 4, characterized in that that the side-wise working Ausrtfckmittel (28) telescope primary (102,104) and secondary drive means (134, 136). 6. Additional device fttr forklift according to claim 1, characterized in that that the locks comprise locking cams (76) which are provided on the plate (14) and the locks (72,74) on the outer one 209825/0583 Apply arms, and wherein the means for selectively actuating the Locking the cams (76) include locking arms (14O, 142) which the Activate the cam (76) in certain positions of the release mechanism. 7 »Procedure for actuating a member that acts on the load in an additional device for forklifts with a six-link linkage, according to any one of claims 1-6, characterized in that two crossing members are held with a member in between which forms part of the load applying means, said intermediate member optionally with one of crossing glides is engaged. 8. Six-link rods for use in narrow hall aisles A release mechanism forklift truck according to claims 1 to 6, wherein the load applying means is rotated 90 on either side of the truck can be characterized by an operational mass on the release mechanism provided, the load-bearing column (30) which forms a link of the six-link linkage, an inner pair of symmetrically arranged arms (3 ^ ·, 36), which can be pivoted with the SSuIe (30) are connected and two links of the six-link linkage form a cast pair of generally symmetrical arms (38, ^ fO), which are each pivotably connected to the inner arms and two members of the six-membered linkage form, one which applies the load Means (16) which forms a link of the six-link linkage, the outer pair of arms from those applying the load Means is overlapped and is pivotally connected to these, locks (32,72,7 ^ -) 1 one of the outer arms each with the load connect applying means. Means for optionally releasing the Locks and means for pivoting the rod members. 209825/0583