JP2000007294A - Road wheel supporting device for lift truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily change a road wheel. SOLUTION: A pair of straddle legs 4 are extended forward from both sides at the lower part of a body, a pair of inside and outside equalizer mechanisms 23, 24 are provided on a pair of supporting plates 22 welded 23 to the ends of the straddle legs 4, a pair of small holes 37 are provided through a carrier plate 29 for the inside equalizer mechanism 23 and a pair of large holes 38 are provided through a carrier plate 29 for the outside equalizer mechanism 24, a pair of supporting shafts 39 for supporting a pair of road wheels 5 in a rotatable manner are passed through the large holes 38 and the end small- diameter portions 39a of the supporting shafts 39 are passed through the small holes 37, and a locking means 40 is provided for locking the rear ends of the supporting shafts 39 to the carrier plate 29 for the outside equalizer mechanism 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A conventional lift truck of this type is disclosed in Japanese Patent Application Laid-Open No. 5-170315. One example of the lift truck will be described with reference to FIGS. A lift device 3 is provided at the front of the vehicle body 2 and a pair of straddle legs 4 extend forward from both lower sides of the vehicle body 2. A pair of front and rear urethane rubber road wheels 5 are provided at the tip of each straddle leg 4.
Are provided, and guide rollers 7 and 8 are outwardly attached to the front end of each straddle leg 4 and the rear end of both sides of the vehicle body 2.

The lift device 3 includes a plurality of (two in this embodiment) masts 10 and 11, an elevating body 12 movably provided on the elevating mast 11, and an elevating body 12.
A horizontal moving body 14 horizontally moved by a pair of upper and lower racks 13 provided on the front surface of the moving body, a revolving body 16 rotatable around a vertical axis 15 provided at a tip of the horizontal moving body 14, and fixed to the revolving body 16 A pair of forks 17, which can be raised and lowered with the forks 17 facing in three directions, forward and left and right (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 a passage 19 between the storage shelves 18,
The upper work W is carried into a 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, a pair of left and right support plates 22 fixed to the distal end of the straddle leg 4 by bolts and nuts 21 are used.
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 provided between the two equalizer mechanisms 23 and 24.
Each of the load wheels 5 is rotatably fitted via a bearing 26.

Each of the equalizer mechanisms 23 and 24 has a rectangular plate-shaped carrier plate 29 which is loosely fitted into a horizontally-long rectangular hole 28 penetrating through each support plate 22. Projection 3 protruding from the center of the upper edge
0 is used as a fulcrum, and each of the support shafts 2 is inserted into a pair of front and rear through holes 31 penetrating through each carrier plate 29.
5 are inserted through the small diameter portions 25a at both ends.
9, the two support shafts 25 and both carrier plates 29 are screwed into the screw holes of the small diameter portion 25a.
And are integrally connected. Reference numeral 33 denotes a disk interposed between each load wheel 5 and each carrier plate 29, and reference numeral 34 denotes a connection bracket fixed to the distal ends of both support plates 22 by bolts 35. It is rotatably supported.

In the above configuration, when the load wheel 5 is replaced, the fastening of the bolts and nuts 21 is released to remove the two support plates 22 from the straddle leg 4, and the fastening of the bolts 35 is released and connected. The bracket 34 is removed from the support plates 22, the support plates 22 are separated from each other, the carrier plates 29 of the equalizer mechanisms 23 and 24 are pulled out from the square holes 28, and the bolts 32 are released and the carrier is released. Plate 29 and disk 33
Is removed from each support shaft 25, each support shaft 25 is extracted from each load wheel 5, and a new load wheel 5 is externally fitted to the support shaft 25, and then assembled in a procedure reverse to the above.

[0007]

In the above-mentioned conventional configuration,
Since the replacement work of the load wheel 5 is troublesome and troublesome, the number of parts is large, the production cost is high, and both the support plates 22 are fixed to the straddle legs 4 by the bolts and nuts 21. The strength due to the fastening is insufficient, and there is a possibility that the vehicle body 2 may roll due to the twisting of the two support plates 22 due to an excessive load when the work W is lifted up.

The present invention has been made in consideration of the above-described conventional drawbacks, and has as its object to provide a road wheel support device for a lift truck which can easily perform a road wheel replacement operation, has a small number of parts, and has excellent rigidity. .

[0009]

In order to achieve the above object, according to the first aspect of the present invention, a pair of straddle legs extend forward from both sides of a lower portion of a vehicle body and project from the tip of each straddle leg. In a load wheel support device of a lift truck in which a load wheel is rotatably mounted via a support shaft between a pair of support plates, the support shaft is engaged with the support plates so as to be able to be inserted and removed along the axial direction thereof. It is characterized by being.

According to the above construction, when replacing the load wheel, the support shaft is released only by releasing the support shaft and pulling the support shaft in the axial direction to separate from the support plates. Can be easily taken out from between the two support plates by pulling out from the road wheel, and a new road wheel can be easily mounted between the two support plates via the support shaft in the reverse procedure. In addition, the replacement work of the road wheel can be performed quickly and easily.

According to a second aspect of the present invention, in the first aspect of the present invention, 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 a carrier plate of the inner equalizer mechanism. In addition, a pair of large-diameter holes are formed through the carrier plate of the outer equalizer mechanism, and a pair of support shafts rotatably supporting a pair of load wheels are inserted through the large-diameter holes. A small diameter portion at the tip of the shaft is inserted into each of the small diameter holes, and a locking means for locking the rear end of each support shaft to the carrier plate of the outer equalizer mechanism is provided.

According to the above construction, when replacing the road wheel, the locking by the locking means is released, and each support shaft is simply pulled and removed from the carrier plate of both the inner and outer equalizer mechanisms. The load wheel can be easily removed from the support plate by pulling it out from the load wheel, and a new load wheel can be easily mounted between the support plates via the support shaft and the inner and outer equalizer mechanisms in the reverse order. And the replacement work of the road wheel can be performed quickly and easily.

According to a third aspect of the present invention, in the second aspect of the present invention, the stopper means engages with a concave step formed at the rear end of the pair of support shafts, and the stopper And a fastener for fastening the plate to the carrier plate of the outer equalizer mechanism.

According to the above configuration, 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 Costs can be reduced.

The invention according to claim 4 is the invention according to claim 2 or 3.
In the invention described above, a disk interposed between each of the load wheels and each of the carrier plates is fixed to each of the carrier plates.

According to the above configuration, the disc also serves as a stopper for each carrier plate, and the manufacturing cost can be reduced as compared with a case where the stopper is provided separately.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the pair of support plates are welded to tips of the straddle legs.

According to the above configuration, since the pair of support plates are welded to the tip of the straddle leg and have high rigidity, the two support plates are twisted due to an excessive load when lifting up the work as in the related art. Therefore, there is no fear that the vehicle body rolls.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a load truck 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 tip of each straddle leg 4, and an inner equalizer mechanism is provided. 2
3 and a pair of large diameter holes 38 are formed in the carrier plate 29 of the outer equalizer mechanism 24 to rotatably support the pair of load wheels 5. Is inserted into each large-diameter hole 38, the small-diameter portion 39 a at the front end of each spindle 39 is inserted into each small-diameter hole 37, and the rear end of each spindle 39 is connected to the outer equalizer mechanism 24. Locking means 40 for locking to the carrier plate 29 is provided. Also,
The disc 33 interposed between each of the load wheels 5 and each of the carrier plates 29 is attached to each of the carrier plates 2.
9. Reference numeral 41 denotes a spindle insertion / removal tap hole formed on the rear end surface of each spindle 39.

The locking means 40 engages with a concave step 39b formed by a D-cut at the rear end of the pair of support shafts 39, and a stopper plate 40a which fits into the concave groove 42 of the carrier plate 29; The stopper plate 40
and a bolt (fastening member) 40b for fastening a to the carrier plate 29. FIG. 8 with a configuration other than the above
The same parts as those of the conventional example shown in FIG.

In the above configuration, when the load wheel 5 is replaced, the stopper plate 40a is removed from the carrier plate 29 by unscrewing the bolt 40b of the locking means 40, and then a drawing tool (not shown)
The screw is pulled into the tap hole 41 of each support shaft 39 and the tool is pulled, thereby pulling each support shaft 39 outward along the axial direction of the support shaft 39, thereby allowing the carrier plates of the inner and outer equalizer mechanisms 23 and 24 to be pulled. Remove from 29. Thereby, since each support shaft 39 is extracted from each load wheel 5, each load wheel 5 can be easily extracted from between the two support plates 22. Next, a new road wheel 5 may be mounted between the support plates 22 via the support shaft 39 in a procedure reverse to the above.

According to the above configuration, the replacement work of the road wheel 5 can be performed 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 production costs can be reduced.

Further, each carrier plate 29 is provided with a square hole 28.
When inserted into the inside, the disks 33 fixed to the respective carrier plates 29 come into contact with the inner surfaces of the respective support plates 22,
Since each carrier plate 29 does not fall out from the square hole 33 and its disk 33 also serves as a member for preventing the carrier plate 29 from falling off, the manufacturing cost is reduced as compared with the case where the member for preventing the carrier plate 29 is provided separately. Can be cheaper.

Further, since a pair of support plates 22 are welded 36 to the tip of the straddle leg 4 and have high rigidity, the two support plates 22 are subjected to an excessive load when the work W is lifted up as in the prior art. There is no danger that the vehicle body 2 will roll sideways due to twisting (see FIGS. 5 to 7).

[0025]

According to the first aspect of the present invention, when replacing the road wheel, the locking of the support shaft is released, and the support shaft is pulled in the axial direction thereof to be separated from both support plates. By simply pulling out the support shaft from the load wheel, the load wheel can be easily removed from between the two support plates, and a new load wheel can be easily inserted between the support plates via the support shaft in the reverse procedure. The road wheel can be exchanged quickly and easily.

According to the second aspect of the present invention, when replacing the road wheel, the locking by the locking means is released,
By simply pulling each support shaft and removing it from the carrier plate of both the inner and outer equalizer mechanisms, each support shaft can be extracted from the load wheel, and the load wheel can be easily taken out from between the two support plates. A new road wheel can be easily mounted between the support plates via the support shaft and the inner and outer equalizer mechanisms, and the road wheel can be exchanged quickly and easily.

According to the third 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 reduced. And production costs can be reduced.

According to the fourth aspect of the present invention, the disk also serves as a stopper for each carrier plate, and the manufacturing cost can be reduced as compared with a case where the stoppers are separately provided.

According to the fifth aspect of the present invention, the pair of support plates are welded to the tip of the straddle leg and have high rigidity. There is no fear that the support plate is twisted and the vehicle body rolls.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a load 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 the lift truck.

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

FIG. 7 is a schematic plan view showing a state where the work is stored 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 vehicle body 4 straddle leg 5 load wheel 6 load wheel support device 22 support plate 23 inner equalizer mechanism 24 outer equalizer mechanism 29 carrier plate 33 disk 36 welding 37 small diameter hole 38 large diameter hole 39 support shaft 39a tip small diameter portion of support shaft 39b concave Step portion 40 Locking means 40a Stopper plate 40b Bolt (fastener)

Claims (5)

[Claims] A pair of straddle legs extend forward from both lower sides of the vehicle body, and a load wheel is rotatably mounted via a support shaft between a pair of support plates protruding from the tip of each straddle leg. In a lift truck load wheel support device, the support shaft is fixed to the two support plates so as to be able to be inserted and removed along the axial direction of the support plate. 2. A pair of inner and outer equalizer mechanisms are provided on the pair of support plates, a pair of small-diameter holes penetrate through a carrier plate of the inner equalizer mechanism, and a pair of large-diameter holes are formed on the carrier plate of the outer equalizer mechanism. A diameter hole is penetrated, and a pair of spindles rotatably supporting a pair of road wheels are inserted through the large diameter holes, and a tip small diameter portion of each spindle is inserted into the small diameter hole, 2. The load wheel support device for a lift truck according to claim 1, further comprising a locking means for locking a rear end of each of said support shafts to a carrier plate of said outer equalizer mechanism. 3. A stopper plate, wherein the locking means engages with a concave step formed at a rear end of the pair of spindles.
3. The device according to claim 2, further comprising a fastener for fastening the stopper plate to a carrier plate of the outer equalizer mechanism. 4. A disk interposed between each of the load wheels and each of the carrier plates is fixed to each of the carrier plates.
A device for supporting a road wheel of a lift truck as described in the above. 5. The system according to claim 1, wherein said pair of support plates are welded to the ends of said straddle legs.
5. The road wheel support device for a lift truck according to any one of claims 1 to 4.