JPH051793U - Carrier with auxiliary wheels - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention, as seen in a reach-type forklift truck, is a transport vehicle in which the load weight on wheels changes depending on the load stroke, the transport stroke, and the unload stroke. It is an object of the present invention to provide a work vehicle that can be stably transported by equipping the vehicle with auxiliary wheels. [Structure] Auxiliary wheels that share and support the load weight applied to the main wheels are attached to approximately the middle left and right positions of the vehicle body of a transport vehicle such as a forklift truck, and the auxiliary wheels have a wheel structure capable of adjusting the load supporting force. It is characterized by

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  This invention is to support the change of load weight on the wheels by using auxiliary wheels. A carrier with auxiliary wheels that can be carried and carried out in a stable condition. It is about.

[0002]

[Prior art]

  For example, as seen in a reach-type forklift truck, In order to efficiently perform unloading work, the fork can be moved in the front-back direction of the vehicle body. Specialized vehicles designed to be capable of doing so are known. In other words, when loading cargo, Extend the fork from the body side, and when loading is complete, shrink the fork to the vehicle body side. When transporting and unloading, extend the fork again from the vehicle body side and perform unloading work. It's a hauling vehicle. Furthermore, this reach type forklift truck is In addition to the efficiency of loading and unloading goods, It is generally configured in a three-wheeled form to avoid small turns. In particular The main wheels consist of two front wheels and one rear wheel, and the front wheels are steered. Generally, the rear wheel has a wheel structure with a drive control function. is there. Moreover, the front wheels are generally composed of wheels with a smaller diameter than the rear wheels. is there.

[0003]   As described above, the reach-type forklift truck can be used to load and unload cargo. Because it is efficient and can turn a small amount when traveling, it has traditionally been used in the factory yard or in general. It has been widely used as a cargo handling vehicle in areas such as freight warehouses. However, this load We focused on the characteristics of handling efficiency and steering maneuverability, and It has come to be used for transportation. Especially for construction method, panel method and prefabricated method. As the law is adopted, the transportation of materials consisting of these panels and prefabricated It has also come to be used for assembly work. As a result, the following questions The issue has been raised as a technical issue.

[0004]

[Problems to be solved by the device]

  First of all, the first point is that the road surface is different from the conventional factory yard and general cargo warehouse, Since it is under construction, it is often poorly maintained. The second point is The configuration of the transport vehicle is a three-wheel type, and the loading and transport strokes are During the unloading process, the load on the wheels changes. Ie the shipment During the process, the fork is fully extended from the car body, so As loaded on the front wheels. During the transportation process, The load of the front wheel and the rear wheel is The wheels are evenly distributed and loaded. Further arrive at the destination and unload the cargo If you do this, extend the reach of the fork again to unload it. The time load is supported by the front wheels.

[0005]   In this way, the load on the wheels changes, and the road surface is constructed as described above. Since it is under construction, it is bad, so it caused wheel digging etc. due to running. It is easy, especially because the front wheels are composed of wheels with a relatively small diameter. It was remarkable. As a result, the conventional forklift truck can be used as is. In case of accident, ensure safe and efficient cargo handling work while keeping a tight turn. There was a problem that it was difficult.

[0006]   The present invention solves such problems and improves the efficiency and steering of cargo handling work. It was devised for the purpose of providing a carrier with auxiliary wheels that does not impair mobility. It is a thing.

[0007]

[Means for Solving the Problems]

  As a means for achieving the above-mentioned object, the present invention relates to a transported object for front, rear, left and right wheels. Fork riff whose load weight changes during loading, transportation, and unloading There is an auxiliary wheel with the following structure on a transport vehicle such as a car. .   That is, in the middle left and right position of the vehicle body of a carrier such as a forklift truck, Auxiliary wheels that can adjust the load-bearing force are attached to the main wheels of the front and rear wheels. It is configured to distribute the load weight to be loaded.   Then, the auxiliary wheels capable of adjusting the load bearing force are hydraulically operated cylinders. A supplementary structure with a built-in spring that can adjust the restoring force by It is configured as an auxiliary wheel.   Further, the hydraulically operated cylinder is used to reach a fork in a forklift truck. However, when it is contracted to the vehicle body side to almost the middle position, that fact is detected and the detection signal is detected. It is characterized in that it is configured and equipped to operate based on the No.

[0008]

[Action]

  As described above, the present invention is intended for transportation in which the load weight applied to the main wheels changes. At the intermediate position on the front, back, left and right of the car, the auxiliary load that distributes the load applied to the main wheels Equipped with auxiliary wheels, it has the following effects. First, this supplement The load applied to the main wheels is reduced according to the number of auxiliary wheels. That As a result, even at construction sites where road surface conditions are poor, the occurrence of ring digging is suppressed. It is restricted and does not hinder the cargo handling itself.   In particular, the auxiliary wheel has a hydraulic force control cylinder that can adjust the restoring force. In addition, it has a built-in pulling structure and, in a forklift truck, Hydraulic operation, aiming at the timing when the load on each wheel changes The cylinder is configured to operate and the spring restoring force is adjusted. Therefore, even if the load applied to the main wheels, that is, the front and rear wheels, changes, Can be gently dispersed and absorbed, and stable cargo handling work can be maintained. Is.

[0009]

【Example】

  Furthermore, a carrier with auxiliary wheels according to the present invention, specifically, a reach type fork riff The configuration and operation of the present invention will be described in detail based on the embodiment of the vehicle.   First, FIG. 1 is a side view of a reach type forklift truck equipped with auxiliary wheels. Is a plan view thereof. As shown, the auxiliary wheel 1 is an intermediate wheel between the front wheel 20 and the rear wheel 30. As shown in the plan view of FIG. It is configured to be supported by five wheels including 1 and 1. That is, the auxiliary wheel 1 And by equipping 1, the main wheels, in other words the front wheels 20 and 2 5 wheels including the auxiliary wheels 1 and 1 that reduce the load applied to the 0 and rear wheels 30. I am trying to bear the burden by distributing it to all.

[0010]   Therefore, the position of the fork 50 shown in phantom in FIGS. Reach the left side (as shown in the figure), and when the load 40 is finished. And the load weight on each wheel at the time of transporting it to the destination and unloading , As already explained, by equipping the auxiliary wheels 1 and 1, , Reduced. As a result, even if the road surface conditions are poor, the front wheels 20 and 20 are The inconvenience of slipping into the surface is eliminated. Of course, after the end of the loading process, Even if the reach of KU 50 is shortened to the vehicle body side and it moves to the transportation stroke, The load weight on each wheel according to is supported by five wheels including the auxiliary wheels 1 and 1. Therefore, it is reduced compared to the case where it was conventionally supported by three wheels. Even if the situation is a little bad, don't worry that it will sink into the road or cause a ring moat. It's gone. In other words, it became possible to maintain stable transportation work.

[0011]   Next, the auxiliary wheel 1 is used as the auxiliary wheel 1 capable of adjusting the load supporting force. As a means for this, it was configured as shown in FIG.   That is, as shown in FIG. 3, the inner cylinder 3 equipped with the caster wheel 2 at the lower end is Between the outer cylinder 5 and the mounting bracket 4 for mounting on the vehicle body side , A compression spring consisting of the coil spring 6 is built in, and the coil spring 6 The cap-shaped coil spring retainer 7 is fitted into the outer cylinder 5 to which the head corresponds. It was Then, on the head of the corresponding outer cylinder 5 above the coil spring retainer 7, Further, the movable element 9 of the hydraulic operation cylinder 8 is attached so that it can be pushed vertically downward. It was That is, when the hydraulic operating cylinder 8 is operated, the mover 9 is lowered. As a result, the coil spring 6 is compressed via the coil spring retainer 7. As configured. In other words, to compress the coil spring 6 As a result, the restoring force of the coil spring 6 is relatively increased, and by this restoring force, It is configured so that the load supporting force applied to the auxiliary wheel 1 itself can be increased. In addition, 10 shown in FIG. 3 is for adjusting the initial setting force of the coil spring 6. It is an adjustment bolt for the purpose. That is, between the outer circumference of the inner cylinder 3 and the outer circumference of the outer cylinder 5, Connecting with the adjusting bolt 10 and operating the adjusting nut 10a of the adjusting bolt 10 Therefore, the connection distance between the two is adjusted to adjust the initial setting force of the coil spring 6. I did it. Further, H shown in FIG. 3 is the compression of the coil spring 6 in the initial stage. Is the height, and h is for operating the hydraulic operating cylinder 8 to move the coil spring 6 When the restoring force is maximized, that is, when the coil spring 6 is compressed to the minimum It shows the compression height of the coil spring. In this state, auxiliary The load bearing capacity of the wheel 1 becomes maximum.

[0012]   Furthermore, pull in the fork 50 of the forklift truck to the vehicle body side, In the process of shortening the reach and moving to the transportation stroke of the transported object 40, each wheel is loaded. As a means for suppressing the load change due to When it is contracted, it is detected and the hydraulic operating cylinder 8 is operated. The detecting means for transmitting the signal for the purpose is configured as follows.

[0013]   First, as shown in FIG. 1 and FIG. Itch 11 was assembled. On the other hand, integrally with the fork 50 in the horizontal direction, specifically, On the lower surface of the fork mast 51 side that moves in the front-rear horizontal direction of the vehicle body, the limit The limit switch that contacts the switch 11 and turns on the limit switch 11 itself. The cam 12 for the switch is attached. FIG. 4 shows the limit switch 11 6 is an operation diagram showing a relative positional relationship between the cam 12 and the cam 12. FIG. That is, the fork 50 It is pulled in to the vehicle body side, and in Fig. 4, it is pulled in from the left side to the right side, and the reach is shortened. Then, first, the right side of the cam 12 hits the limit switch 11 to be turned on, The hydraulic operating cylinder 8 is configured to start operation.   When the hydraulic operating cylinder 8 starts to operate, it is built in the auxiliary wheel 1 accordingly. Since the compression of the coil spring 6 is started, the load of the auxiliary wheel 1 is correspondingly increased. The bearing capacity will be increased.   Then, the reach of the fork 50 is completely retracted to the vehicle body side, that is, When the so-called reach-in is completed, the hydraulic operation system The mover 9 of the Linda 8 descends to the bottom dead center to reduce the compression height of the coil spring 6. It is reduced from H shown in FIG. 3 to h. That is, the loading process is completed and the transportation process is started. When the reach-in is completed, the load bearing capacity of the auxiliary wheel 1 is gradually increased It is configured to be maximum.

[0014]   The transport vehicle with auxiliary wheels according to the present invention is configured as described above with reference to the embodiments. Therefore, the following effects can be exhibited, and construction work with bad road conditions Its utility as a material carrier on site can be significantly improved. (1) By providing auxiliary wheels, the load on the main wheels can be reduced and It is designed to increase the load bearing capacity of the auxiliary wheels in response to changes in load. Therefore, it is possible to maintain the load applied per wheel at an appropriate value at all times. is there. As a result, it is efficient even at construction sites where the road surface conditions are relatively poor. Safe transportation work can be performed. (2) The means for increasing and changing the load bearing force of the auxiliary wheel is a hydraulic operation cylinder and It is a combination of coil springs. Compared to the merits of efficiency and safety obtained from them, the investment economic cost is cheap, It is easy to spread. (3) Furthermore, the change in the load bearing force of the auxiliary wheels is made to correspond to the change in the load weight, and the change is continued. Because it can be done by moving the cam, Since it can be done in conjunction with the setting, the load weight on each wheel does not change. It is done to others. As a result, a series of loading process, transportation process, and unloading process It is possible to smoothly carry out the cargo handling work described in (1) and (2) above, and the effect of Therefore, it is most suitable as a material transportation means at a construction site.

[0015]

[Brief description of drawings]

FIG. 1 is a side view of a reach type forklift truck equipped with auxiliary wheels according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a partially cutaway side view showing a structure of an auxiliary wheel.

FIG. 4 is an operation diagram showing a positional relationship between a cam and a limit switch that sends an operation signal to a hydraulic operation cylinder that changes a load supporting force of auxiliary wheels.

[Explanation of symbols]

1 auxiliary wheel 20 front wheels 30 rear wheels 40 packages Fifty forks 2 caster wheels 3 inner cylinder 4 bracket 5 outer cylinder 6 coil spring 7 Coil spring retainer 8 hydraulic operation cylinder 9 mover 10 Adjustment bolt 11 Limit switch 12 cams

Continued front page    (72) Inventor Atsushi Shirato             1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd. (72) Creator             1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. An auxiliary wheel that disperses and bears a load weight applied to a main wheel is provided at a substantially middle left and right position of a vehicle body of a carrier such as a forklift truck, and the auxiliary wheel adjusts a load supporting force. A vehicle with auxiliary wheels, characterized by being configured with possible auxiliary wheels. 2. The auxiliary wheel-carrying device according to claim 1, wherein the auxiliary wheel capable of adjusting the load supporting force is an auxiliary wheel having a spring for adjusting a restoring force by a hydraulic operating cylinder. car. 3. The hydraulic operating cylinder operates based on a detection signal from a detector that is turned on when the reach of a fork in a forklift truck is contracted to the vehicle body side to a substantially intermediate position. The transport vehicle with auxiliary wheels according to claim 2.