JP4702582B2 - Transport device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transport device that loads cargo by a fork arm and transports it by human power on a premises or indoors.
[0002]
[Prior art]
On the premises and indoors, a transport device that manually transports cargo that has been handled, such as a pallet truck and hand lifter, is used to transport the cargo. The pallet truck as this type of conveying device has a pair of fork arms, and the fork arms are vertically driven by a drive unit. The drive unit is provided with a front wheel, and a rear wheel is provided at a rear end portion of the fork arm having one end attached to the drive unit.
[0003]
Therefore, when transporting cargo, the fork arm is inserted into the lower surface of the pallet on which the cargo is loaded, then the fork arm is raised to lift the pallet, and then the pallet truck is pulled to remove the cargo. I am trying to carry it.
[0004]
By the way, when the cargo is likely to be damaged by vibration such as a precision instrument, the care is taken in handling it. For example, when transporting from a factory to a factory or from a factory to a delivery destination, a truck with an air suspension is used to prevent the cargo from being damaged during transportation.
[0005]
[Problems to be solved by the invention]
However, when the cargo unloaded from the truck is transported on the premises or indoors, the above-described transport device such as a pallet truck or a hand lifter is used. In these transport devices, the fork arms for transporting cargo are only supported by the front wheels and the rear wheels, and these wheels have a structure in which rubber wheels are mounted on the outer peripheral surface of the iron wheels, and pneumatic tires. The cushion performance is significantly inferior to
[0006]
Therefore, even if the cargo is transported without being damaged by the truck, if the road surface has unevenness or steps when transported by the transport device on the premises or indoors, the cargo may be damaged. .
[0007]
Even if the wheels of the transport device are replaced with pneumatic tires, the impact received from road surface irregularities or steps cannot be reliably absorbed, so there was a risk of impacting the cargo on the fork arm and causing damage. .
[0008]
An object of the present invention is to provide a transport device that can prevent a cargo from being damaged by vibration when the cargo is transported by a fork arm such as a pallet truck or a hand lifter.
[0011]
[Means for Solving the Problems]
The present invention relates to a transport apparatus having a fork arm for transporting cargo,
The fork arm is covered with a transport tray, and between the transport tray and the fork arm, there is a viscosity, and a vibration isolator made of a soft elastomer that holds the transport tray is provided on the fork arm due to the viscosity. Being
The soft elastomer is in the transport device, wherein an adhesive force of a surface joined to the fork arm is set smaller than an adhesive force of a surface joined to the transport tray.
[0012]
This invention is a transport device having a fork arm for transporting cargo,
The fork arm is covered with a transport tray, and a vibration isolator made of an elastic material is provided between the transport tray and the fork arm.
The transport tray is formed in a substantially U-shaped cross section covering the top surface and both side surfaces of the fork arm, and the vibration isolator is provided between the top surface and both side surfaces of the fork arm. It is in the conveyance apparatus characterized by this.
[0013]
According to this invention, since the conveyance tray is provided on the fork arm that conveys the cargo via the vibration isolator, vibration generated during conveyance by the vibration isolation material interposed between the fork arm and the cargo is reduced from being transmitted to the cargo. can do.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the invention will be described with reference to the drawings.
[0015]
1 and 2 show a pallet truck 1 as a transport device according to an embodiment of the present invention. The pallet truck 1 includes a drive unit 2. The drive unit 2 includes a hydraulic cylinder 3 having an axis that is vertical, and a pair of front wheels 4 is rotatably provided at the lower end of the hydraulic cylinder 3.
[0016]
The rod 5 of the hydraulic cylinder 3 can be driven in the upward (protruding) direction by hydraulic pressure by rotating a handle 6 pivotally attached to the hydraulic cylinder 3 in the direction of the arrow. The handle 6 is provided with a lever 7 as shown in FIG. 2, and by operating the lever 7, the rod 5 can be lowered from the raised state.
[0017]
One end of a connecting member 8 is attached to the rod 5. One end of a pair of fork arms 11 is connected and fixed to the lower end of the connecting member 8. One end of a link (not shown) is swingably attached to the other end portion of the fork arm 11, and a rear wheel 12 having a smaller diameter than the front wheel 4 is rotatably attached to the other end of the link. .
[0018]
When the hydraulic cylinder 3 is operated by the handle 6 and the connecting member 8 is raised, the fork arm 11 is raised together with the connecting member 8. At that time, since the link attached to the other end of the fork arm 11 rotates in a direction protruding from the lower surface of the fork arm 11, the grounding state of the rear wheel 12 attached to this link is maintained, and the fork arm 11 Can be held at a predetermined height.
[0019]
The fork arm 11 is provided with a transport tray 14. The transport tray 14 is formed by bending a steel plate into a substantially U-shaped cross section. That is, the transport tray 14 includes an upper wall portion 14a that covers the upper surface of the fork arm 11 and a pair of side wall portions 14b that cover both side surfaces.
[0020]
A vibration isolator 15 is partially provided between the upper surface of the fork arm 11 and the upper wall portion 14 a of the transport tray 14. In this embodiment, a rectangular plate-shaped vibration isolator 15 having a predetermined thickness is provided at both longitudinal ends of the fork arm 11.
[0021]
As the vibration isolator 15, a soft elastomer having viscosity such as urethane gel is used. The vibration isolator 15 adheres and holds the transport tray 14 to the fork arm 11 using the viscosity of the soft elastomer.
[0022]
The vibration isolator 15 is cut into a rectangular plate shape as shown in FIG. 3, and the surface to be joined to the fork arm 11 is made of resin in order to reduce the joining strength with the fork arm 11. A film 16 is attached. The film 16 is formed smaller than the surface of the vibration isolator 15 that is joined to the fork arm 11.
[0023]
Accordingly, the entire surface of the vibration isolator 15 is bonded to the upper wall portion 14 a of the conveyance tray 14, and the vibration isolator 15 is bonded to the conveyance tray 14 to the fork arm 11 in an area other than the film 16.
[0024]
Therefore, when transporting cargo that does not require the transport tray 14, if the transport tray 14 is removed from the fork arm 11 against the adhesive force of the vibration isolator 15, the vibration isolator 15 is always on the transport tray 14 side. It comes to adhere to.
[0025]
The side wall 14b of the transport tray 14 is provided with a nut 17, and the nut 17 is provided with a bolt 18 for hanging a rope (not shown) for fixing the cargo to the fork arm 11 when the cargo is transported. It can be screwed in.
[0026]
According to the pallet truck 1 having such a configuration, the transport tray 14 is attached to the fork arm 11 when transporting cargo such as precision equipment unloaded from a truck (not shown) on the premises or indoors. Then, if the cargo 20 is placed on the transport tray 14 and transported as shown by a chain line in FIG. 1, it is transported by the vibration isolating material 15 provided between the fork arm 11 and the transport tray 14. Is prevented from being transmitted to the cargo 20. Therefore, the cargo 20 can be transported without being damaged by vibrations generated during transportation.
[0027]
FIG. 5A is a graph in which the acceleration generated on the transport tray 14 when the transport tray 14 is provided on the fork arm 11 via the vibration isolator 15 and the cargo 20 is transported on the transport tray 14 is measured. FIG. 5B is a graph in which the acceleration generated in the fork arm 11 is measured. That is, FIG. 5B shows a case where the fork arm 11 is not provided with the transport tray 14 via the vibration isolator 15 under the same conditions as in the prior art.
[0028]
Measurement conditions are as follows: the length of the fork arm 11 is 1200 mm, the vibration isolator 15 is a urethane gel with a hardness of 15 degrees, and a plate shape of 75 mm × 75 mm × 20 t, and both longitudinal ends of each fork arm 11 A total of four were provided, one for each. The cargo 20 having a weight of 128 kg was placed on the transport tray 14.
[0029]
When measured under the above conditions, the average acceleration generated on the transport tray 14 was 0.097 G, whereas the average acceleration generated on the fork arm 11 was 1.564 G. That is, it was confirmed that the vibration received by the cargo is attenuated by 93.8% by providing the fork arm 11 with the transport tray 14 via the vibration isolator 15.
[0030]
The vibration isolator 15 is not limited to a product having a rubber hardness of 15 degrees, and a vibration isolator 15 having another rubber hardness may be used. For example, a 30 degree product may be used. When the attenuation degree of acceleration was measured using a 30-degree product, the attenuation rate was lower than that of the 15-degree product, but the attenuation rate was still 90.2%.
[0031]
On the other hand, a film 16 is attached to one surface of the vibration isolator 15 that is joined to the fork arm 11 so that the vibration isolator 15 adheres more strongly to the transport tray 14 than the fork arm 11.
[0032]
Accordingly, for example, when transporting cargo that does not require the transport tray 14, if the transport tray 14 is removed from the fork arm 11, the vibration isolation material 15 always adheres to the upper wall 14 a of the transport tray 14, and the transport tray 14 At the same time, it is removed from the fork arm 11.
[0033]
Therefore, since the vibration isolator 15 does not remain on the fork arm 11 side by removing the transport tray 14, the vibration isolator 15 is not removed from the fork arm 11 after removing the transport tray 14. I'm sorry. That is, the removal of the transport tray 14 can be performed easily and quickly.
[0034]
In the first embodiment, the vibration isolator 15 is provided only on the upper wall 14a of the transport tray 14, but it may be provided also on the inner surfaces of the pair of side wall portions 14b as shown in FIG. . As a result, the transport tray 14 exhibits a damping action against vibration applied in the width direction as well as the vertical direction.
[0035]
Further, although the case where the transport tray is applied to the pallet truck has been described, the present invention can be applied to any other transport device such as a hand lifter. Is possible.
[0036]
Furthermore, the vibration isolator is not limited to a soft elastomer such as urethane gel, and other elastic materials such as urethane rubber may be used.
[0037]
【The invention's effect】
As described above, according to the present invention, the transport tray is provided on the fork arm that transports the cargo via the vibration isolator.
[0038]
For this reason, vibrations generated during transportation can be reduced by the vibration isolator interposed between the fork arm and the cargo, so that it can be reduced, especially when transporting cargo that may be damaged by vibration. The cargo can be transported without damaging it.
[Brief description of the drawings]
FIG. 1 is a side view of a pallet truck according to an embodiment of the present invention.
FIG. 2 is a front view of the same.
3A is a plan view of a transport tray, FIG. 3B is a front view, and FIG. 3C is a side view.
FIG. 4 is a perspective view showing a surface on which a film of a vibration isolator is provided.
5A is a graph obtained by measuring acceleration on a transport tray, and FIG. 5B is a graph obtained by measuring acceleration on a fork arm.
FIG. 6 is a sectional view of a transport tray showing another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pallet truck 11 ... Fork arm 14 ... Conveying tray 15 ... Vibration isolator 16 ... Film

Claims (2)

In a transport device having a fork arm for transporting cargo,
The fork arm is covered with a transport tray, and between the transport tray and the fork arm, there is a viscosity, and a vibration isolator made of a soft elastomer that holds the transport tray is provided on the fork arm due to the viscosity. Being
The conveying device, wherein the soft elastomer has an adhesive force of a surface joined to the fork arm set smaller than an adhesive force of a surface joined to the transport tray. In a transport device having a fork arm for transporting cargo,
The fork arm is covered with a transport tray, and a vibration isolator made of an elastic material is provided between the transport tray and the fork arm.
The transport tray is formed in a substantially U-shaped cross section covering the top surface and both side surfaces of the fork arm, and the vibration isolator is provided between the top surface and both side surfaces of the fork arm. A conveying apparatus characterized by that.

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