JP3370602B2 - Road truck support device for lift trucks - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road wheel support device for a lift truck including, for example, a three-way fork.

[0002]

2. Description of the Related Art Conventionally, as a lift truck of this type, there is one disclosed in Japanese Patent Laid-Open No. 5-170315, and an example thereof will be described with reference to FIGS. 5 and 6. A vehicle body 2 having a drive tire 1 will be described. A lift device 3 is provided at the front part of the vehicle body, and a pair of straddle legs 4 extend forward from both sides of the lower part of the vehicle body 2. A pair of front and rear urethane rubber road wheels 5 are provided at the tips of the straddle legs 4.
A road wheel support device 6 for supporting the vehicle is provided, and guide rollers 7 and 8 are mounted outward at the front ends of the straddle legs 4 and the rear ends of both side surfaces of the vehicle body 2.

The lift device 3 has a plurality of stages (two stages in this embodiment) of masts 10, an elevating body 12 provided on the elevating side mast 11 so as to be able to ascend and descend, and the elevating body 12
A horizontal moving body 14 that is horizontally moved by a pair of upper and lower racks 13 provided on the front surface of the vehicle, a revolving body 16 that can revolve around a vertical axis 15 provided at the tip of the horizontal moving body 14, and is fixed to the revolving body 16. And a pair of forks 17 that have been formed, and can move up and down in a state in which the forks 17 are directed in three directions of forward and leftward (see phantom lines in FIGS. 5 and 6),
For example, as shown in FIG. 7, after moving the vehicle body 2 to a predetermined position through the passage 19 between the storage shelves 18, the fork 17
The work W above is carried into the predetermined storage section 18a of the storage shelf 18, and conversely, the work W is carried out from the predetermined storage section 18a.

As shown in FIGS. 8 and 9, the road wheel support device 6 includes a pair of left and right support plates 22 fixed to the tip of the straddle leg 4 by bolts and nuts 21.
And a pair of inner and outer equalizer mechanisms 23 and 24 provided on each of the support plates 22 and a pair of front and rear support shafts 25 installed between the both equalizer mechanisms 23 and 24.
Each road wheel 5 is rotatably fitted over a bearing 26.

Each of the equalizer mechanisms 23 and 24 has a rectangular plate-shaped carrier plate 29 loosely fitted in a horizontally elongated rectangular hole 28 penetrating each support plate 22, and the carrier plate 29 is a square hole 28. Projection 3 protruding from the center of the upper edge
0 is a fulcrum, and the support shafts 2 are formed in a pair of front and rear through holes 31 penetrating each carrier plate 29.
5, the small-diameter portions 25a at both ends are inserted, and the carrier plate 2
By screwing the bolt 32 through the screw hole of the small diameter portion 25a through the support shaft 25 and both carrier plates 29
And are integrally connected. In addition, 33 is a disc interposed between each road wheel 5 and each carrier plate 29, 34 is a connecting bracket fixed to the tip ends of both support plates 22 with bolts 35, and the guide roller 7 is It is rotatably supported.

In the above structure, when the road wheel 5 is replaced, the bolts and nuts 21 are unfastened to remove both support plates 22 from the straddle leg 4, and the bolts 35 are unfastened and connected. The brackets 34 are removed from both support plates 22, then the support plates 22 are separated from each other, the carrier plates 29 of both equalizer mechanisms 23 and 24 are pulled out from the square holes 28, and the bolts 32 are unfastened to release the carrier. Plate 29 and disk 33
Are removed from the respective support shafts 25, the respective support shafts 25 are removed from the respective load wheels 5, and then a new road wheel 5 is externally fitted on the support shafts 25, and then the assembly is carried out in the reverse order of the above.

[0007]

SUMMARY OF THE INVENTION In the above conventional configuration,
Since the replacement work of the road wheel 5 is troublesome and troublesome, the number of parts is large and the manufacturing cost is high, and further, both support plates 22 are fixed to the straddle leg 4 by the bolts and nuts 21, The strength due to the fastening is insufficient, and there is a risk that the vehicle body 2 will roll laterally due to the two support plates 22 being twisted due to an excessive load when the work W is lifted up.

In view of the above-mentioned conventional drawbacks, an object of the present invention is to provide a road wheel supporting device for a lift truck which can easily perform a road wheel replacement work, has a small number of parts, and is excellent in rigidity. .

[0009]

In order to achieve the above object, the invention according to claim 1 is such that a pair of straddle legs are extended forward from both lower sides of the vehicle body and project at the tip of each straddle leg. In a lift truck load wheel support device in which a load wheel is rotatably mounted via a support shaft between a pair of support plates, the support shaft is engaged with both support plates so as to be insertable and removable along the axial direction thereof. In addition, a pair of inner and outer equalizer mechanisms are provided on the pair of support plates, and a pair of small-diameter holes are formed through the carrier plate of the inner equalizer mechanism and a pair of carrier plates of the outer equalizer mechanism. Large-diameter holes are provided so that a pair of support shafts that rotatably support a pair of road wheels are inserted through the large-diameter holes.
Small tip end small diameter portions of the respective support shafts are inserted into the respective small diameter holes, and locking means for locking the rear end portions of the respective support shafts to the carrier plate of the outer equalizer mechanism are provided. .

According to the above construction, when the road wheel is replaced, the support shaft is simply unlocked, pulled in the axial direction of the support shaft, and disengaged from both support plates. Can be easily removed from between the support plates by pulling out the load wheel from the road wheel, and a new road wheel can be easily mounted between the support plates via a spindle by the reverse procedure. The exchange work of the road wheel can be performed quickly and easily.

Further, according to the above construction, when the road wheel is replaced, the locking by the locking means is released, and each supporting shaft is simply pulled and removed from the carrier plate of both the inner and outer equalizer mechanisms. Can be easily removed from between the support plates by removing the load wheel from the load wheel, and a new road wheel can be easily installed between the support plates via the support shaft and both internal and external equalizer mechanisms in the reverse procedure. It can be mounted and the road wheel replacement work can be performed quickly and easily.

According to a second aspect of the present invention, in the first aspect of the present invention, the locking means engages with a recessed step portion formed at the rear end portions of the pair of support shafts, and the stopper plate. It is characterized by comprising a fastener for fastening the plate to the carrier plate of the outer equalizer mechanism.

According to the above construction, the pair of support shafts can be easily locked to the carrier plate of the outer equalizer mechanism only by the stopper plate and the fastener, and the number of parts required for the locking is small, and the manufacturing is possible. The cost can be reduced.

The invention according to claim 3 is the invention according to claim 1 or 2.
In the invention described above, a disc interposed between each of the road wheels and each of the carrier plates is fixed to each of the carrier plates.

According to the above construction, the disk also serves as a fall prevention member for each carrier plate, and the manufacturing cost can be reduced as compared with the case where the fall prevention member is separately provided.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a road wheel support device 6 for a lift truck according to an embodiment of the present invention, in which a pair of support plates 22 are welded 36 to the tips of the straddle legs 4 to form an inner equalizer mechanism. Two
A pair of small-diameter holes 37 are provided through the carrier plate 29 of No. 3 and a pair of large-diameter holes 38 are provided through the carrier plate 29 of the outer equalizer mechanism 24, so as to rotatably support the pair of road wheels 5. Of the support shaft 39 is inserted into each of the large diameter holes 38, and the tip small diameter portion 39a of each of the support shafts 39 is inserted into each of the small diameter holes 37, and the rear end of each of the support shafts 39 of the outer equalizer mechanism 24 is inserted. Locking means 40 for locking the carrier plate 29 is provided. Also,
The disc 33 interposed between each of the road wheels 5 and each of the carrier plates 29 has the respective carrier plate 2
It is fixed to 9. Reference numeral 41 denotes a spindle insertion / extraction tap hole formed on the rear end surface of each spindle 39.

The locking means 40 engages with a recessed step portion 39b formed by D-cutting at the rear ends of the pair of support shafts 39, and a stopper plate 40a fitted into the recessed groove 42 of the carrier plate 29, The stopper plate 40
and a bolt (fastener) 40b for fastening a to the carrier plate 29. FIG. 8 shows a configuration other than the above.
Also, the same parts as those of the conventional example shown in FIG.

In the above construction, when replacing the road wheel 5, the bolt 40b of the locking means 40 is unscrewed to remove the stopper plate 40a from the carrier plate 29, and then a pulling tool (not shown) is used.
The external male screw portion of each of the support shafts 39 is screwed into the tap holes 41 of each support shaft 39, and the tool is pulled to pull each support shaft 39 outward along the axial direction of the support plate of the inner and outer equalizer mechanisms 23 and 24. Remove from 29. As a result, since each support shaft 39 is pulled out from each road wheel 5, each road wheel 5 can be easily taken out from between both support plates 22. Next, the new road wheel 5 may be mounted between the support plates 22 via the support shaft 39 in the reverse order of the above.

According to the above construction, the work of replacing the road wheel 5 can be carried out quickly and easily. Further, the pair of support shafts 39 can be easily locked to the carrier plate 29 only by the locking means 40 composed of one stopper plate 40a and two bolts 40b, and the number of parts required for the locking. The production cost can be reduced.

Further, each carrier plate 29 is provided with a square hole 28.
When inserted inside, the discs 33 fixed to the carrier plates 29 are brought into contact with the inner surfaces of the support plates 22,
Each of the carrier plates 29 is designed so as not to fall out of the square hole 33, and the disk 33 also serves as a fall prevention member for each carrier plate 29. Therefore, the manufacturing cost is higher than that when the fall prevention members are separately provided. Can be cheaper.

Furthermore, since a pair of support plates 22 are welded to the tips of the straddle legs 4 and have high rigidity, both support plates 22 are subjected to an excessive load when the work W is lifted up as in the conventional case. There is no risk that the vehicle body 2 will be laterally swayed by twisting (see FIGS. 5 to 7).

[0022]

According to the first aspect of the present invention, when the road wheel is replaced, the support shaft is unlocked, and the support shaft is pulled in the axial direction to be disengaged from both support plates. Just by pulling the support shaft out of the load wheel, the load wheel can be easily taken out from between the support plates, and in the reverse procedure, a new load wheel can be easily installed between the support plates via the support shaft. It can be mounted on the road wheel, and the replacement work of the road wheel can be performed quickly and easily.
In addition, when replacing the road wheel, simply unlock the lock by the locking means, pull each spindle to remove it from the carrier plate of both the inner and outer equalizer mechanisms, and pull out each spindle from the road wheel to remove the load wheel. The wheel can be easily taken out from between both support plates, and a new road wheel can be easily installed between both support plates via the support shaft and both internal and external equalizer mechanisms by the reverse procedure. The replacement work can be performed quickly and easily.

According to the second aspect of the present invention, the pair of support shafts can be easily locked to the carrier plate of the outer equalizer mechanism only by the stopper plate and the fastener, and the number of parts required for the locking is high. The production cost can be reduced.

According to the third aspect of the present invention, the disk also serves as a fall prevention member for each carrier plate, and the manufacturing cost can be reduced as compared with the case where the fall prevention member is separately provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing a road wheel support device for a lift truck according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a side view of the same.

FIG. 4 is a horizontal sectional view of the same.

FIG. 5 is a side view of a lift truck.

FIG. 6 is a plan view of the lift truck.

FIG. 7 is a schematic plan view showing a work storage state by the lift truck.

FIG. 8 is a side view showing a conventional example.

FIG. 9 is a horizontal sectional view of the same.

[Explanation of symbols]

2 car body 4 straddle legs 5 road wheels 6 Road wheel support device 22 Support plate 23 Inner equalizer mechanism 24 Outer equalizer mechanism 29 carrier plate 33 discs 36 welding 37 Small hole 38 Large hole 39 spindle 39a Small diameter end of spindle 39b concave step 40 Locking means 40a Stopper plate 40b bolt (fastener)

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B66F 9/075 B66F 9/10

Claims (3)

(57) [Claims] 1. A pair of straddle legs extend forward from both lower sides of the vehicle body, and a road wheel is rotatably mounted via a support shaft between a pair of support plates projecting from the tips of the straddle legs. In a road wheel support device for a lift truck, the support shaft is locked to both the support plates along the axial direction so that the support shaft can be inserted and removed, and the pair of support plates is provided with a pair of inner and outer equalizer mechanisms. In addition, a pair of small diameter holes are formed through the carrier plate of the inner equalizer mechanism, and a pair of large diameter holes are formed through the carrier plate of the outer equalizer mechanism, and a pair of road wheels are rotatably supported. A pair of support shafts are inserted into the large diameter holes, a tip small diameter portion of each support shaft is inserted into the small diameter holes, and a rear end portion of each support shaft is attached to the outer equalizer. A road wheel support device for a lift truck, characterized in that a locking means for locking the carrier plate of the riser mechanism is provided. 2. A stopper plate, wherein the locking means engages with a recessed step portion formed at rear end portions of the pair of support shafts,
The road wheel support device for a lift truck according to claim 1, further comprising a fastener for fastening the stopper plate to a carrier plate of the outer equalizer mechanism. 3. The disk according to claim 1, wherein a disc interposed between each of the load wheels and each of the carrier plates is fixed to each of the carrier plates.
Road wheel supporting device for the lift truck described.