JPS6049736B2 - Earthmoving vehicle equipped with a torsion bar that reduces the load acting on the tilt link - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an earthmoving vehicle to which a working device is connected, and more particularly to an earthmoving vehicle of a type in which the working device is connected to the tip ends of a pair of lift arms and a pair of tilt links.

BACKGROUND OF THE INVENTION Conventionally, as an earthmoving vehicle having a rotor of the type described above, one having a configuration as shown in FIG. 1 has been widely put into practical use. In the earthmoving vehicle shown in FIG. (shows only one of the pair of lift arms 4 and the pair of tilt links 6), and a packet, fork, etc. is provided at the tip of each of the pair of lift arms 4 and the pair of tilt links 6. Appropriate parts of a working device 8 (in the illustrated case, a working device called a log fork or a skid, which is suitably used for transporting logs, etc.) are rotatably connected. In such an earthmoving vehicle, as is well known to those skilled in the art, the lifting and lowering movements of the pair of lift arms 4 and the tilt-forward and tilt-back movements of the pair of tilt links 6 are performed as indicated by the two-dot chain line in FIG. A, B
, C and D, the working device 8 is raised and lowered in the vertical direction, and is moved around the tips of the pair of lift arms 4 (more specifically, the connection point 10 between the pair of lift arms 4 and the working device). It can be tilted or rotated. In the working device as described above, the position of the pair of tilt links 6 depends on the angular position of the working device 8 with respect to the tips of the pair of lift arms 4, that is, the tilting state of the working device 8.
The load acting on it changes significantly.

For example, when the working device 8 is tilted forward from the angular position shown by the two-dot chain line C to the angular position shown by the two-dot chain line D in FIG.
The load acting on the pair of tilt links 6 increases considerably due to the weight of the cargo (not shown) loaded thereon and the rotational moment around the tips of the pair of lift arms 4 due to this weight. . In particular, when the load loaded on the working device 8 is heavy, such as logs, the change in the load acting on the pair of tilt links 6 is significant. Therefore, in order to be able to tilt the working device 8 as required (that is, tilt forward or tilt back) without damaging the pair of tilt links, the link mechanism of the pair of tilt links 6 and the As the working means (usually hydraulic cylinders 12), the maximum load acting on the pair of tilt links 6, and therefore the load acting on the pair of tilt links 6 when the loaded working device 8 is tilt forwarded the most. Therefore, it is necessary to use a material with sufficient strength and operating ability. In other words, the working capacity of an earthmoving vehicle when the strength and operating capacity of the one-to-five tilt link 6 and its operating means are set to predetermined values, that is, the weight of the load that can be loaded onto the working device 8 is: Even when the loaded work device 8 is in the most tilt-forward state, the load acting on the pair of tilt links 6 is limited to a range that does not exceed the strength and operating capacity of the pair of tilt links 6. Therefore, in order to increase the working capacity of the conventional earthmoving vehicle, it is necessary to increase the strength and operating capacity of the link mechanism of the pair of tilt links 6 and its operating means.

Therefore, it is clear that an increase in the strength and operating capacity of the link mechanism of the pair of tilt links 6 and its operating means results in a significant increase in manufacturing costs. The present invention has been made in view of the above-mentioned facts, and its main purpose is to increase the working capacity of earthmoving vehicles of the above-mentioned type by making relatively simple and inexpensive improvements thereto. That's true.

According to the present invention, in an earthmoving vehicle in which a working device is rotatably connected to the respective tips of a pair of lift arms and a pair of tilt links; at least one torsion bar extending laterally is attached to the working device; One end of the torsion bar is prevented from rotating in at least a predetermined direction with respect to the working device, and the other end can freely rotate with respect to the working device, and the torsion bar is A projecting piece is provided at or near the other end; when the working device is tilted forward beyond a predetermined angular position with respect to the tips of the pair of lift arms, the pair of lift arms An earthmoving vehicle is provided, characterized in that at least one tip of the torsion bar is configured to abut against the protruding piece, and the torsion bar is elastically twisted.

Further, according to the present invention, in an earthmoving vehicle in which a working device is rotatably connected to the distal end portions of a pair of lift arms and a pair of tilt links; is installed,
One end of the torsion bar is provided with an arm that engages with a load such as raw wood when it is loaded onto the working device, and the arm engages with the load loaded onto the working device. The one end of the torsion bar is prevented from rotating in a predetermined direction with respect to the working device, and the other end of the torsion bar is allowed to freely rotate with respect to the working device. , a projecting piece is provided at or near the other end of the torsion bar; when the working device is tilted forward beyond a predetermined angular position with respect to the tips of the pair of lift arms, An earthmoving vehicle is provided, characterized in that a tip end of at least one of a pair of lift arms is configured to abut the protruding piece. Furthermore, according to the present invention, in an earthmoving vehicle in which a working device is rotatably connected to the distal end portions of a pair of lift arms and a pair of tilt links; A torsion bar is attached, one end of the torsion bar is prevented from rotating at least in a predetermined direction with respect to the pair of lift arms, and the other end is freely rotatable with respect to the pair of lift arms. a projecting piece is provided at or near the other end of the torsion bar; the working device is tilt forward beyond a predetermined angular position with respect to the tips of the pair of lift arms; There is provided an earthmoving vehicle, characterized in that when the working device or at least one of the pair of tilt links is partially abutted against the projecting piece, the torsion bar is elastically twisted. be done.

In the earthmoving vehicle of the present invention as described above, the working device is tilt-forwarded beyond a predetermined angular position with respect to the tips of the pair of lift arms. When the load acting on the torsion bar increases, the torsion bar attached to the working device or the pair of lift arms is elastically twisted.

Therefore, at least a portion of the rotational moment around the tips of the pair of lift arms due to the weight of the work equipment and the load loaded thereon, which would normally act on the pair of tilt links, is transferred to the torsion bar as elastic energy. The load acting on the pair of tilt links is reduced accordingly. Therefore, according to the present invention, the working capacity of an earthmoving vehicle equipped with a pair of tilt links having a linkage mechanism of a predetermined strength and working capacity and its actuating means is considerably increased. On the other hand, torsion bars have a considerably larger allowable amount of absorbed elastic energy per unit volume than other types of springs such as coil springs, and are suitable for absorbing the rotational moment. It can be manufactured relatively inexpensively.

Further, the required attachment of the torsion bar to the working device or to the pair of lift arms can be accomplished extremely easily and inexpensively. Therefore, the improvements made in accordance with the present invention are relatively simple and inexpensive, while providing superior performance. Below, Figures 2-A to 6 illustrate preferred embodiments of the earthmoving vehicle according to the present invention.
This will be explained in more detail with reference to FIG.

Referring first to Figure 2-A, at the front of a wheeled or tracked vehicle, such as a rotor (not shown in Figure 2), there is a structure known per se. A pair of lift arms 4 and a pair of tilt links 6 are provided.

A pair of lift arms 4 and a pair of tilt links 6
An appropriate working device 8 such as a packet or a fork is connected to the tip of each of the . The working device 8 in the illustrated embodiment is a log fork or a. The skid itself is well known and is suitably used for tasks such as transporting original documents. Such a working device 8 generally includes both sides 1 of the main body.
A pair of plates 22a is spaced apart in the lateral direction between the upper lateral member 20 and the lower lateral member 21 disposed between 4a and 14b.
and 22b are fixed. And plate pair 22
Each of the lower end portions 24a and 24b of the pair of plates 22a and 22b is rotatably connected to a position 26 at the tip of each of the pair of lift arms 4, and the upper end portion 24a and 24b of the pair of plates 22a and 22b is
Each of 8a and 28b is rotatably connected to a position 30 at the tip of each of the pair of tilt links 6. In the earthmoving vehicle as described above, as already explained with reference to FIG. By the forward and tilt back movements, the working device 8 is raised and lowered, and is also tilted or rotated about the position 26 of the tip of the pair of lift arms 4. The above-mentioned configuration of the earthmoving vehicle is
Since it is well known to those skilled in the art and does not constitute a novel feature of the earthmoving vehicle according to the invention, a detailed description thereof will be omitted.

According to the invention, the working device 8 or the pair of lift arms 4
At least one laterally extending torsion bar is mounted on the at least one torsion bar.

In the specific example shown in FIG. 2, two torsion bars 32, 34 extending parallel to each other are attached to the working device 8.

The torsion bars 32 and 34 are rotatably supported by the pair of plates 22a and 22b of the working device 8, and one end of the torsion bar 32 (the right end in FIG. 2-A)
is fixed to the right side 14a of the working device 8 by appropriate means such as welding, and is prevented from rotating with respect to the working device 8, and one end of the torsion bar 34 (
2-A) is the left side 14 of the working device 8.
b by suitable means such as welding, and is prevented from rotating relative to the working device 8. on the other hand,
Near the other end of the torsion bar 32 (that is, near the left end located between the plate pair 22b) and near the other end of the torsion bar 34 (near the left end located between the plate pair 22b), which can freely rotate with respect to the working device 8.
That is, in the vicinity of the right end located between the pair of plates 22a), there is a protruding piece 3 that protrudes downward from the torsion bars 32 and 34.
6 and 38 are provided. Such protruding pieces 36 and 3
8 is fixed to the torsion bars 32 and 34 by a suitable method such as press fitting or fitting through serrations, and is prevented from rotating relative to the torsion bars 32 and 34. On the other hand, a protruding lug 40 is fixed or integrally formed at the tip of each of the pair of lift arms 4.

Explaining with reference to FIG. 2-B as well as FIG. 2-A,
In the above-described earthmoving vehicle according to the present invention, the tilt forwards of the pair of tilt links 6 allow the working device 8 to be moved toward the tips of the pair of lift arms 4, for example, as indicated by the solid line in FIG. 2-B. When it is tilted forward from the angular position shown in FIG. 2-B to the angular position shown by the two-dot chain line in FIG. (The change in the relative angular position with respect to the arms 4 is shown by rotating the pair of lift arms 4), the protruding lug 40 provided at the tip of each of the pair of lift arms 4 Torsion bar 32
and protruding pieces 36 and 3 provided at the other end of 34.
8.

Then, when the working device 8 is further tilted forward beyond the angular position indicated by the two-dot chain line in FIG. 38 is rotated counterclockwise in FIG. 34 is elastically twisted. Therefore, in the earthmoving vehicle according to the present invention, when the working device 8 moves beyond a predetermined angular position with respect to the tips of the pair of lift arms 4 (i.e., the angular position where the protruding lug 40 abuts the protruding pieces 36 and 38). When tilted, the working device 8 and the cargo 42 loaded therein (No. 2-B
At least a part of the rotational moment around the tips of the pair of lift arms 4 due to the rotational moment (see Fig.) is absorbed as elastic energy by the elastically twisted torsion bars 32 and 34, and that amount acts on the pair of tilt links 6. The load to do so is reduced. In the conventional earthmoving vehicle, as described above, as the working device 8 is tilted forward with respect to the tips of the pair of lift arms 4, the load acting on the pair of tilt links 6 gradually increases. In the earthmoving vehicle according to the present invention, as described above, when the working device 8 is tilt-forwarded beyond a predetermined angular position with respect to the pair of lift arms 4, the rotation that would otherwise act on the pair of tilt links 6 at least a portion of the moment is absorbed by the torsion bars 32 and 34 as elastic energy;
The load acting on the pair of tilt links 6 is reduced by that amount, and therefore, the increase in the load acting on the pair of tilt links 6 due to the tilt forwarding of the working device 8 to the tips of the pair of lift arms 4 is suppressed. Avoided.

Thus, with the earthmoving vehicle according to the present invention, the working capacity for the pair of tilt links 6 of a given strength and operating capacity is considerably increased compared to the conventional one. Furthermore, the second
- In the specific example shown in Figure A, the working device 8 is equipped with two torsion bars 32 and 34, but instead of this, only one torsion bar or three or more torsion bars can be installed in the working device 8. It can also be worn.

Of course, if only one torsion bar is used, the protruding lug 40 on either one of the pair of lift arms 4 can be omitted. Furthermore, in the specific example shown in FIG. 2-A, the protruding lugs 40 are fixed or integrally formed at the tips of each of the pair of lift arms 4, and the protruding lugs 40 always move together with the pair of lift arms 4. It is configured as follows.

However, in order to provide sufficient strength to elastically twist the torsion bars 32 and 34, the size of the protruding lug 40 is considerably large, and the protruding lug 40 is configured to always move together with the pair of lift arms 4. Then, when the working device 8 tilts (that is, tilts forward or tilts back) with respect to the tips of the pair of lift arms 4, the relative relationship between the working device 8 and the pair of lift arms 4 as shown in FIG. If a problem such as the tip of the protruding lug 40 colliding with the lower horizontal member 21 of the working device 8 occurs when the relationship changes between the relationship shown by the solid line and the relationship shown by the two-dot chain line, the protrusion The lug 40 is rotatably attached to the tip of each of the pair of lift arms 4, and an appropriate stop piece is fixed to each of the pair of lift arms 4 or the working device 8 at an appropriate position. It is also possible to configure the protruding lug 40 to prevent each of the pair of lift arms 4 from pivoting counterclockwise in FIG. 2-B in the state shown by the two-dot chain line in FIG. In this way, the relative relationship between the working device 8 and the pair of lift arms 4 becomes 2-B.
When the relationship shown by the two-dot chain line in the figure changes to the relationship shown by the solid line, the protruding lug 40 pivots clockwise relative to the pair of lift arms 4 (in Fig. 2-B).
The pair of lift arms 4 are shown pivoting counterclockwise with respect to the protruding lug 40), and are always maintained in the position shown by the two-dot chain line in Figure 2-B with respect to the working device 8. so that the protruding lug 40 is attached to the lower cross member 2 of the working device 8.
Collision with 1 is prevented. On the other hand, when the working device 8 is further tilted forward from the state shown by the two-dot chain line in FIG. 2-B with respect to the tips of the pair of lift arms 4, the pair of lift arms 4 When the tool further pivots clockwise relative to the working device 8 from the position shown by the two-dot chain line, the stop piece prevents the protruding lug 40 from pivoting counterclockwise relative to the pair of lift arms 4. Therefore, the projecting lug 40 pivots further clockwise with respect to the working device 8 together with the pair of lift arms 4 from the position indicated by the dash-dotted line in FIG. 36 and 38 are rotated counterclockwise in FIG. 2-B to elastically twist the torsion bars 32 and 34. Furthermore, if desired, in order to prevent the torsion bars 32 and 34 from being damaged by impacting them with loads or other objects to be processed by the working device 8 during actual operation, A suitable protective cover (not shown) covering the torsion bars 32 and 34 can also be provided on the working device 8. Alternatively, the lower transverse member 32 of the working device 8 may be formed from a hollow tubular body, and the torsion bars 32 and 34 may be disposed within the lower transverse member 21. It can also be used as a protective cover. In this case, a projecting piece 36 provided near the other ends of the torsion pars 32 and 34
and 38 are made to protrude from inside the lower lateral member 21 through appropriate notches formed in the lower lateral member 21, and are provided at the tips of each of the pair of lift arms 4 so as to cooperate with the protruding lugs 40. You can force it. Next, 3rd-A
A second specific example of the earthmoving vehicle according to the present invention will be described with reference to the drawings.

The second specific example illustrated in FIG. 3-A is obtained by adding the following modification to the first specific example illustrated in FIG. 2-A.

That is, in the second specific example illustrated in FIG. 3-A,
One end of the torsion bar 32 (right end in Figure 3-A)
One end of the torsion bar 34 (the left end in FIG. 3-A) is also rotatably supported by the right end 14a and left side 14b of the working device 8 without being fixed, and can freely rotate with respect to the working device 8. I am forced to do what I can.
At one end of each of the torsion bars 32 and 34, arcuate arms 44 and 46 extending upward substantially perpendicular to the longitudinal axes of the torsion bars 32 and 34 are rotatable relative to the torsion bars 32 and 34. It is fixed by an appropriate method so that it cannot be moved. In such a second specific example, as can be easily understood from FIG. 3-B, when a baggage 42 such as an original document is loaded onto the working device 8, the arms 44 and 46 engage with the baggage 42. By combining and thus torsion bars 32 and 34
The one end of each is prevented from rotating counterclockwise in FIGS. 3-A and 3-B with respect to the working device 8. As described above, in the second specific example, when the work device 8 is not loaded with cargo 42, the one end of each of the torsion bars 32 and 34 can also freely rotate with respect to the work device 8. In order to achieve this, the protruding lugs 40 provided at the tips of each of the pair of lift arms 4 abut on the protruding pieces 36 and 38 provided at the other ends of the torsion bars 32 and 34, so that the protruding pieces 36 and 38 in the counterclockwise direction in FIGS. 31A and 3-B, each of the torsion bars 32 and 34 is entirely rotated relative to the working device 8 in FIGS. 3-A and 3-B. In Figure B, the torsion bars 32 and 34 are rotated counterclockwise, so that the torsion bars 32 and 34 are not twisted elastically.

However, when the load 42 is loaded onto the work device 8, the arms 44 and 46 engage with the load 42, so that the one ends of the torsion bars 3 and 34 are moved from the third side toward the work device 8. Since rotation in the counterclockwise direction is prevented in FIG. A and FIG. 3-B, the working device 8 is at a predetermined angular position (
That is, when the protruding lug 40 is tilted forward beyond the angular position indicated by the two-dot chain line in FIG. A projecting lug 40 is provided at the other end of each of the torsion bars 32 and 34.
is rotated counterclockwise in FIGS. 3-A and 3-B, thereby elastically twisting the torsion bars 32 and 34. Thus, in the second specific example,
A load 42 is loaded onto the work device 8, and the weight of the load 42 is added to the weight of the work device 8, causing the work device 8 to exceed a predetermined angular position with respect to the tips of the pair of lift arms 4. The torsion bars 32 and 34 act to reduce the load acting on the pair of tilt links 6 only when there is a risk that an excessive load will be generated on the pair of tilt links 6 if the tilt is forwarded.

In this way, the torsion bars 32 and 3 can be used only when necessary.
It is needless to say that if the torsion bars 32 and 34 are made to work, the life span of the torsion bars 32 and 34 can be extended. Figure 4-A illustrates a third embodiment of an earthmoving vehicle according to the invention.

This third specific example is obtained by adding the following modifications to the second specific example shown in FIG. 3-A.

That is, in the third specific example illustrated in FIG. 4-A,
Fasteners 48 and 50 are provided for selectively and releasably fixing the arms 44 and 46, which are fixed to the one end of each of the torsion bars 32 and 34, to the right side 14a and left side 14b of the working device 8. ing. Each of these fasteners 48 and 50 is inserted into the right side 14 of the working device 8 through a through hole formed in the arms 44 and 46.
a and the left side portion 14b, such as a bolt, which can be screwed into the left side portion 14b. such third
In the specific example, when the arms 44 and 46 do not engage the load 42 as required even when the load 42 is loaded onto the work device 8 due to the shape of the load 42 loaded onto the work device 8, for example. etc., the arms 44 and 46 are fixed to the right sides 14a and 14b of the working device 8 by fasteners 48 and 50, so that the one ends of the torsion bars 32 and 34 do not rotate relative to the working device 8. This allows the torsion bars 32 and 34 to work as desired.

Next, a fourth specific example of the earthmoving vehicle according to the present invention will be described with reference to FIG. 5-A.

In a fourth specific example shown in FIG. 5-A, one torsion bar 52 extending laterally is attached to the pair of lift arms 4 rather than to the working device 8.

The torsion bar 52 is rotatably supported by support brackets 56 and 58 fixed to the upper surface of the distal end of each of the pair of lift arms 4 and the upper surface of a horizontal member 54 fixed between the distal ends of the pair of lift arms 4. (In addition, the fifth
-A pair of tilt links are omitted in Figure A for clarity). And torsion bar 52
One end (the right end in Figure 5-A) is fixed to one of the pair of lift arms 4 (the lift arm located on the right side in Figure 5-A) via a connecting piece 60, and the pair of lift arms 4 so as not to rotate. On the other hand, the other end of the torsion bar 52 (fifth -
A projecting piece 62 that projects downward and forward from the torsion bar 52 is provided at the left end in FIG. The protruding piece 62 is fixed to the other end of the torsion bar 52 by an appropriate method such as press-fitting or fitting via serrations, and is prevented from rotating relative to the torsion bar 52. . On the other hand, in the working device 8, an engaging piece 64 is fixed to the lower end of the outer plate of the left side plate pair 24b.

Explaining with reference to FIG. 5-B as well as FIG. 5-A,
In the fourth embodiment as described above, by tilt forwarding of a pair of tilt links (not shown),
When the working device 8 is tilted forward with respect to the pair of lift arms 4 from the angular position shown by the solid line in FIG. 5-B and brought to the angular position shown by the two-dot chain line in FIG. , In order to simplify the drawing, in FIG. 5-B, changes in the relative angular position between the working device 8 and the pair of lift arms 4 are illustrated by rotating the pair of lift arms 4. ), the engagement piece 6 provided on the working device 8
4 comes into contact with the protruding piece 62 provided at the other end of the torsion bar 52.Then, the working device 8 is further tilted forward beyond the angular position shown by the two-dot chain line in FIG. 5-B. Then, since the engaging piece 64 is in contact with the protruding piece 62, the protruding piece 62 is rotated clockwise in FIGS. 5-A and 5-B, and therefore the torsion bar 52
The other end of the torsion bar 52 is rotated clockwise, thereby elastically twisting the torsion bar 52. Therefore, the fourth
Also in the specific example, when the working device 8 is tilted forward beyond a predetermined angular position (i.e., the angular position where the engaging piece 64 abuts the protruding piece 62) with respect to the tips of the pair of lift arms 4. , at least a portion of the rotational moment around the tips of the pair of lift arms 4 caused by the working device 8 and the load 42 loaded therein (Fig. 5-B) is absorbed by the torsion bar 52 which is elastically twisted. It is absorbed as elastic energy, and the load acting on the pair of tilt links (not shown) is reduced accordingly. Next, a fifth specific example of the earthmoving vehicle according to the present invention will be described with reference to FIG. 6-A.

Also in the fifth specific example shown in FIG. 6-A, similarly to the fourth specific example, one torsion bar 6 extending laterally is attached not to the working device 8 but to the pair of lift arms 4.
8 is installed.

One end of the torsion bar 66 (the right end in FIG. 6-A) is attached to a support bracket 68 fixed to the upper surface of one of the pair of lift arms 4 (the lift arm located on the right side in FIG. 6-A). It is fixed by a suitable method such as welding, and is prevented from rotating relative to the pair of lift arms 4. On the other hand, torsion bar 6
The other end of 6 (left end in Figure 6-A) is rotated by a bifurcated support bracket 70 fixed to the upper surface of the other of the pair of lift arms 4 (the lift arm located on the left side in Figure 6-A). It is freely supported and allowed to freely rotate relative to the pair of lift arms 4. A projecting piece 72 extending from the torsion bar 66 toward the road is provided at the other end of the torsion bar 66. The protruding piece 72 is fixed to the other end of the torsion bar 66 by an appropriate method such as press-fitting or fitting via serrations, and is prevented from rotating relative to the torsion bar 66. 6th-
Explaining with reference to FIG. 6-B as well as FIG. A, in the fifth specific example as described above, a pair of tilt links 6
Due to the tilt forward movement, the working device 8 is tilted forward with respect to the pair of lift arms 4 from the angular position shown by the solid line in FIG. 6-B, and is shown by the two-dot chain line in FIG. 6-B. When placed in the angular position, the front link 74 constitutes a part of one of the pair of tilt links 6 (the tilt link located on the left side in FIG. 6-A), more specifically, a part of the tilt link. A base portion (that is, a connecting portion with the front lever 76 forming a part of the tilt link) contacts a protruding piece 72 provided at the other end of the torsion bar 66 .

When the working device 8 is further tilted forward beyond the angular position indicated by the two-dot chain line in FIG. , the protruding piece 72 is rotated counterclockwise in FIGS. 6-A and 6-B, so that the torsion bar 6
The other end of the torsion bar 66 is rotated counterclockwise, thereby elastically twisting the torsion bar 66. Therefore,
In the fifth specific example as well, the working device 8 maintains a predetermined angular position with respect to the tips of the pair of lift arms 4 (i.e., the angular position where a part of one of the pair of tilt links 6 abuts the protruding piece 72). When tilted backwards, the work equipment 8
At least a portion of the rotational moment around the tips of the pair of lift arms 4 due to the cargo 42 (Fig. 6-B) loaded therein is absorbed as elastic energy by the torsion bar 66 which is elastically twisted. Therefore, the load acting on the pair of tilt links 6 is reduced accordingly. In addition, the fourth specific example illustrated in FIG. 5-A and the sixth-A
In the fifth embodiment shown in the figures, one torsion bar 52 or 66 is mounted on the pair of lift arms 4, but if desired, two or more torsion bars may be mounted on the pair of lift arms 4. It can also be worn.

In addition, the fourth specific example illustrated in FIG. 5-A and the fourth specific example illustrated in FIG. 6-A
In the fifth embodiment shown in the figures, said one end of the torsion bar 52 or 66 is permanently fixed to one of the pair of lift arms 4, but if desired, said one end of the torsion bar 52 or 66 can be fixed to one of the pair of lift arms 4. It is configured such that it can be releasably fixed to one side of the lift arm 4 by an appropriate fastening means, and the torsion bar 52 can be fixed to one side of the lift arm 4 as necessary.
Alternatively, the one end of 66 may be fixed to one of the pair of lift arms 4 so that it cannot rotate with respect to the pair of lift arms 4, and the torsion bar 52 or 66 can be made to work only when necessary. .

[Brief explanation of the drawing]

Fig. 1 is a simplified side view showing a known earthmoving vehicle, Fig. 2-A
Figures 3-A, 4-A, 5-A and 6-A
The figures are partial slope views showing first to fifth specific examples of the earthmoving vehicle according to the present invention. Figures 2-B, 3-B, 4-B, 5-B and 6-B illustrate the operation of the first to fifth embodiments of the earthmoving vehicle according to the present invention, respectively. A simplified diagram for explanation. 4...
...Lift arm, 6...Tilt link, 8
...Working equipment, 32, 34, 52 and 66...
・Torsion bar, 36, 38, 62 and 72...
...Protruding piece, 40...Protruding lug, 44 and 46
... Arm, 48 and 50 ... Fastener, 64 ... Engagement piece.

Claims (1)

[Claims] 1. In an earthmoving vehicle in which a working device is rotatably connected to the respective tips of a pair of lift arms and a pair of tilt links; the working device has at least one torsion bar extending laterally. The torsion bar is mounted, one end of the torsion bar is prevented from rotating in at least a predetermined direction with respect to the working device, and the other end is freely rotatable with respect to the working device. A projecting piece is provided at or near the other end of the pair of lift arms; when the working device is tilted forward beyond a predetermined angular position with respect to the tips of the pair of lift arms, At least one tip of the arm abuts the protruding piece,
An earthmoving vehicle characterized in that the torsion bar is configured to be elastically twisted. 2. The earthmoving vehicle according to claim 1, wherein a protruding lug is provided at the tip of at least one of the pair of lift arms, and the protruding lug is configured to abut against the protruding piece. 3. Two torsion bars are attached to the working device in parallel with each other, the protruding lugs are provided at the tips of both of the pair of lift arms, and one of the protruding lugs is provided on one of the torsion bars. Claim 2, wherein the protruding lug is configured to abut the protruding piece provided on the other side of the torsion bar, and the other protruding lug abuts the protruding piece provided on the other side of the torsion bar.
Earthmoving vehicle described in section. 4. The one end of the torsion bar is fixed to the working device so as not to rotate with respect to the working device, according to any one of claims 1 to 3. earthmoving vehicle. 5. In an earthmoving vehicle in which a working device is rotatably connected to the tips of a pair of lift arms and a pair of tilt links; at least one torsion bar extending laterally is attached to the working device; One end of the torsion bar is provided with an arm that engages with a load such as raw wood when it is loaded onto the working device, and the arm engages with the load loaded onto the working device. Therefore, the one end of the torsion bar is prevented from rotating in a predetermined direction with respect to the working device, and the other end of the torsion bar can freely rotate with respect to the working device. A projecting piece is provided at or near the other end of the torsion bar; when the working device is tilted forward beyond a predetermined angular position relative to the tips of the pair of lift arms, the pair of lift arms An earthmoving vehicle characterized in that at least one tip of the arm is configured to abut the protruding piece. 6 A fastener is provided for fixing the arm to the working device, and by fixing the arm to the working device with this fastener, the one end of the torsion bar can also be rotated with respect to the working device. 6. The earthmoving vehicle according to claim 5, wherein the earthmoving vehicle can be prevented from moving. 7. According to claim 5 or 6, a protruding lug is provided at the tip of at least one of the pair of lift arms, and the protruding lug is configured to abut the protruding piece. earthmoving vehicle. 8. Two torsion bars are attached to the working device in parallel with each other, the protruding lugs are provided at the tips of both of the pair of lift arms, and one of the protruding lugs is provided on one of the torsion bars. and the other of the protruding lugs is configured to abut the protruding piece provided on the other side of the torsion bar.
An earthmoving vehicle described in any of paragraphs 7 through 7. 9 In an earthmoving vehicle in which a working device is rotatably connected to the tips of a pair of lift arms and a pair of tilt links; at least one torsion bar extending laterally is attached to the pair of lift arms; , one end of the torsion bar is prevented from rotating at least in a predetermined direction with respect to the pair of lift arms, and the other end is freely rotatable with respect to the pair of lift arms; A projecting piece is provided at or near the other end of the pair of lift arms; when the working device is tilted forward beyond a predetermined angular position with respect to the tips of the pair of lift arms, the working device or An earthmoving vehicle characterized in that a portion of at least one of the pair of tilt links abuts the protruding piece so that the torsion bar is elastically twisted. 10. The earthmoving vehicle according to claim 9, wherein the working device is provided with at least one engagement piece, and the engagement piece is configured to abut the protruding piece. 11. The earthmoving vehicle according to claim 9, wherein at least one front lever of the pair of tilt links is configured to abut the protruding piece. 12 Claim 9, wherein the one end of the torsion bar is fixed to the pair of lift arms so as not to rotate relative to the lift arms.
An earthmoving vehicle described in any of paragraphs 1 to 11.