JPH057105Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a cargo box support structure for a transport vehicle that can maintain the cargo platform and handle horizontally horizontally even when the traveling device side is tilted from side to side.

(b) Prior Art Conventionally, in a transport vehicle in which a cargo box with a handle attached is placed above a traveling device, the traveling device, the cargo box, and the handle are integrally constructed.

(c) Problems to be solved by the invention Therefore, in this type of transport vehicle, when traveling along a contour line on a slope, when the traveling device tilts to the left or right, the handlebars and the cargo box also become integrated on the left and right. Because of the slope, it is difficult for an operator to operate the steering wheel by holding the left and right sides of the steering wheel, and the cargo loaded in the cargo box tends to collapse.

(d) Means for Solving the Problem Therefore, this invention has been developed to solve the problem in a carrier in which the cargo box 1 with the handle 2 attached is placed above the traveling device 3, and the vehicle chassis frame 5 of the cargo box 1 and the traveling device 3 are connected to each other. A pivot point 4 in the front-rear direction that connects the two to each other so as to be rotatable left and right is provided above the traveling device 3, and the bottom surfaces of both sides of the cargo box 1 are positioned below the pivot point 4, Expandable buffer members 5a, 5a are interposed between the bottom surfaces of both sides of the cargo box 1 and the chassis frame 5.

(e) Effect With the above configuration, the cargo box 1 and the handle 2 can freely rotate left and right around the four pivot points relative to the traveling device 3, so that the cargo box 1 and the handle 2 can Even if the traveling device 3 tilts to the left or right, the influence will not be exerted, and the elastic buffer members 5a, 5a are interposed between the bottom surfaces of both sides of the cargo box 1 and the undercarriage frame 5, so that the cargo box When the handle 1 and the handle 2 rotate horizontally due to the inclination of the traveling device 3, they rotate gently to maintain a horizontal posture.

(F) Example Hereinafter, a case in which this invention is applied to a small transport vehicle will be explained with reference to the drawings.

As shown in Figs. 1 and 2, the cargo box support structure of this small transport vehicle consists of a cargo box 1 to which a handle 2 is integrally attached, and a cargo box 1 arranged below the center of the cargo box 1 along the front-rear direction. This traveling device 3 is a rotation fulcrum 4 that connects the traveling device 3 to be rotatable left and right to each other.
The cargo box 1 is provided above the cargo box 1 so that both bottom surfaces of the cargo box 1 are located below the pivot point 4.

That is, first, as the rotation fulcrum 4, the chassis frame 5 is extended upward from the side of the traveling device 3 to the upper center in the width direction of the traveling device 3, and the pivot point 4 has an axis arranged in the front-rear direction at the upper end. A shaft 6 is provided to be fixed or rotatable, and a cylindrical body 7 fixed along the longitudinal direction of the central part of the lower surface of the cargo box 1 is rotatably fitted to the pivot shaft 6, and the pivot at this time is The axis of shaft 6 is adopted. In this case, even if the pivot shaft 6 is provided on the cargo box 1 side and the cylindrical body 7 is provided on the chassis frame 5 side, the axis of the pivot shaft 6 becomes the pivot point 4 in the same way.

The packing box 1 is a box-shaped box with an upward opening in which a tunnel-like raised bottom portion 1a is formed at the lower center in both directions, and the cylindrical body 7 extends along the front-rear direction of the central portion of the lower surface of the raised bottom portion 1a. Fixed. In this case, the raised bottom part 1a is formed in such a size that the pivot shaft 6, the upper part of the undercarriage frame 5, and the upper part of the traveling device 3 can be accommodated from below. The chassis frame 5 is formed in a size that does not interfere with each other even when the chassis frame 5 is rotated left and right to a predetermined angle around a rotation fulcrum 4 and tilted. As a result, the bottom surfaces of both sides of the cargo box 1 are positioned below the pivot point 4, and the cargo box 1 can move left and right around the pivot point 4 as if it were a spinning wheel. Then, for the cargo box 1, the traveling device 3
And when the chassis frame 5 is tilted to the left or right to a predetermined angle, switches 8, 8 are installed near the locations where the chassis frame 5 touches to activate alarm devices (not shown) such as a warning buzzer and a warning lamp to prevent falling. mounted on either side of the In addition, at appropriate positions on the left and right between the cargo box 1 and the chassis frame 5 (in the embodiment, the lower positions of both switches 8, 8),
Expandable buffer members 5a, 5a made of spring material or the like are interposed to prevent the cargo box 1 from swaying left and right due to vibrations from the traveling device 3 side.

The handle 2 has bifurcated left and right grip portions 2a, 2.
A is used, which is fixed to the rear end of the packing box 1, and the left and right grip portions 2a, 2a extend rearward and upward. In addition, behind the cargo box 1 and below the handle 2, an engine 9, a drive case 10, etc. are arranged at the rear end of the chassis frame 5 so as not to interfere with the cargo box 1 and the handle 2. 9
The power is suitably reduced in speed within the drive case 10,
The traveling device 3 can be driven to rotate in forward and reverse directions.

The traveling device 3 includes, in addition to a single crawler as shown in the embodiment, two crawlers arranged side by side on the left and right, one wheel,
Alternatively, a vehicle consisting of four wheels arranged front, rear, left and right is used.

According to the above, while the transport vehicle is moving forward, on a flat road, the traveling device 3, the cargo box 1, and the handlebar 2 are
On the other hand, when traveling along a contour line on a slope, the traveling device 3 and chassis frame 5 move the cargo box 1 and handlebar 2 horizontally around the pivot point 4 depending on the degree of slope. It will rotate left and right and tilt while remaining horizontal. Also, when this inclination reaches a predetermined angle,
The chassis frame 5 approaches one of the left and right inner surfaces of the side raised bottom portion 1a of the cargo box 1, and one switch 8 corresponds to the one.
When this occurs, a warning device is activated, alerting the operator to the danger of the aircraft tipping over and allowing him or her to take appropriate action.

In addition, since elastic buffer members 5a, 5a are interposed between the bottom surfaces of both sides of the cargo box 1 and the undercarriage frame 5, the traveling device 3 suddenly approaches the left and right slopes, causing the cargo box 1 and Even if the handle 2 attempts to rotate around the rotation fulcrum 4, the buffer member 5
a and 5a, the left and right rotation is alleviated, the cargo box 1 and the handle 2 do not wobble left and right, preventing the aircraft from falling over and the load collapsing, and the traveling device 3 is able to handle height differences. If you have to reach a small place, use the cargo platform 1 and handle 2.
The handlebar 2 is rotated slowly from side to side to a horizontal position, and the handlebar 2 can be operated safely without requiring the operator's agility.

Figures 3 to 6 show the traveling device 3 of the small transport vehicle.
This three-point crawler has an output shaft 10 protruding to one side from a drive case 10 fixed to the chassis frame 5.
A drive gear 11 is fixed to the output shaft 10a, and a drive sprocket shaft 13 is fixed to the free end of a connecting arm 12 that is rotatably fitted to the output shaft 10a. The matched drive sprocket 14 is always meshed with the drive gear 11, so that power can be transmitted to the drive sprocket 14 side. Idler shafts 16, 16 are fixed to the other two corners of the truck frame 15, which is formed in the shape of a right-angled isosceles triangle with the drive sprocket shaft 13 as the apex, and the idler 17 is rotatably fitted to each idler shaft. , 17 and the drive sprocket 14, a rubber belt-like crawler 18 is wound around the outer periphery of each of the drive sprocket 14, and these are integrally configured to be rotatable around the output shaft 10a. This three-point crawler is constructed by appropriately providing a locking device (not shown) between the truck frame 15 and the chassis frame 5 or the drive case 10 so that it can be rotated and locked. In the embodiment, in this three-point crawler, idler 1
Large ground contact length posture with the rubber belt-like crawler 18 between 7 and 17 as the ground contact surface (Figure 3)
, medium contact length posture with medium contact length (Fig. 4), and long contact length posture with the rubber belt-like crawler 18 between the drive sprocket 14 and the idlers 17, 17 located in front or rear thereof as the contact surface (Fig. 4). The truck frame 15 is rotated to a position where the posture can be reversed by 180 degrees and the posture can be changed to a small ground contact length posture (Fig. 5) in which only the rubber belt-like crawler 18 on the outer periphery of the drive sprocket 14 is the ground contact surface (FIG. 5). It is constructed so that it can be locked with a locking tool, and can also be used after the lock is released.

Therefore, with this three-point crawler, safety is prioritized, and when straight running performance is desired, the contact length is set to a long position, and when a small turning movement is desired, the contact length is set to a short position, and the load state is set to the front or When it is located toward the rear, the rubber belt-like crawler 18 can be used in a position where the ground-contacting portion can be set in two directions, forward or backward, from the drive sprocket 14 during its long-term contact with the ground. In addition, in an emergency such as when getting stuck in mud, by releasing the lock, the drive sprocket 14 rotates in a planetary manner around the output shaft 10a, so that the triangularly stretched rubber belt-like crawler 18 changes the ground contact length. While doing so, it turns around and around, giving you an advantage in escaping. Furthermore, the loading box 1 is made into a flat loading platform, and this loading platform is covered with a rubber belt-like crawler 18.
be located below a part of the
If a part of the rubber belt-like crawler 18 is configured to protrude from the loading platform, as shown in FIG. , it can be used as a belt conveyor that can load cargo onto the platform of other transport vehicles.

Although the three-point crawler shown above has a right isosceles triangular shape, other irregular triangular shapes may be used.

(G) Effects of the invention As described above, this invention is applicable to a carrier in which a cargo box 1 with a handle 2 attached is placed above a traveling device 3, so that the cargo box 1 and the chassis frame 5 of the traveling device 3 can be moved from side to side with respect to each other. A pivot point 4 in the front-rear direction that is rotatably connected is provided above the traveling device 3, so that the bottom surfaces of both sides of the cargo box 1 are located below the pivot point 4, and both sides of the cargo box 1 are Since the elastic buffer members 5a, 5a are interposed between the bottom surface and the undercarriage frame 5, when the operator grasps the left and right sides of the handle 2 and steers the vehicle forward while directing the aircraft along a contour line on an inclined surface. , around the rotation fulcrum 4, the traveling device 3 side rotates depending on the inclination angle of the inclined surface and rotates left and right, but the direction of the center of gravity of the loading platform 1 and the handle 2 remains constant without shifting to the left or right. Because of the horizontal position, the operation of the handle 2 by the operator is easier than when the handle 2 is on an inclined surface as in the conventional case, compared to a case where the left and right handles 2 have different heights.
Further, since the same applies to the packing box 1, the cargo loaded in the packing box 1 is less likely to collapse than in the conventional case. Furthermore, since the positions of the cargo boxes 1 on the left and right sides of the traveling device 3 are lower than the top surface of the traveling device 3, the center of gravity is lowered, the traveling stability is good, and there is no possibility of overturning. By interposing elastic shock absorbing members 5a, 5a between the bottom surfaces of both sides of the cargo box 1 and the chassis frame 5, it is possible to turn around at the running end of the contour line in a case that does not have a conventional shock absorbing member. When the loading platform 1 suddenly turns, the loading platform 1 rapidly rotates to maintain the horizontal state, but due to the rotation in the higher direction on the inclined side, the horizontal maintaining state of the loading platform 1 is not maintained. In contrast, in the present invention, the aircraft falls in a lower direction on the slope side due to the higher side of the slope or the reaction thereof, or the cargo collapses.
In such a state, the buffer members 5a, 5a act to slowly move the cargo platform 1 and handle 2 in the horizontal direction, thereby preventing the aircraft from overturning and collapsing the cargo. The shock absorbing members 5a, 5a absorb minute differences in height on the slope, and there is no slight shift of the loading platform 1 and the handlebar 2 to the left or right, making steering operations easy.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional front view of the main parts of a small transport vehicle that has implemented this invention, Figure 2 is a cross-sectional side view of the main parts of the same transport vehicle, and Figures 3 to 6 show the three points of the traveling device of the small transport vehicle. A tension crawler is shown, and each figure is a side view of a main part showing each of its usage forms. Code: 1...Logging box, 2...Handle, 3...Travel device, 4...Rotating fulcrum.

Claims (1)

[Scope of utility model registration request] In a transport vehicle in which a cargo box 1 with a handle 2 attached is disposed above a traveling device 3, a rotation fulcrum in the front-rear direction connects the cargo box 1 and the chassis frame 5 of the traveling device 3 so as to be rotatable left and right. 4 is provided above this traveling device 3, so that the bottom surfaces of both sides of the cargo box 1 are located below the rotation fulcrum 4, and a telescopic structure is provided between the bottom surfaces of both sides of the cargo box 1 and the chassis frame 5. A cargo box support structure for a transport vehicle, characterized in that buffer members 5a, 5a are interposed therebetween.