JP4784414B2 - Hand pallet truck towing cart and its towing method - Google Patents

Description

The present invention relates to a wafer command pallet truck towing truck and tow methods. More specifically, the present invention relates to a cart for towing a hand pallet truck (also referred to as a hand lift) that is a tool for conveying a pallet and a method for towing a hand pallet truck.

As a conventional hand pallet truck, various structures are known. For example, Patent Document 1 discloses one.
That is, as shown in FIG. 11, the hand pallet truck 1 includes a caster wheel 2 as a front wheel and a main body 3 provided with an elevating mechanism, and a horizontal fork claw 5 attached to the main body 3 so as to be movable up and down. Have. The fork claw 5 is inserted into an insertion port of a pallet (not shown) on which various loads are placed, and a fixed ring 4 as a rear wheel is provided at the lower end of the tip. The main body 3 is provided with a hydraulic cylinder (not shown) as an elevating mechanism for elevating and lowering the fork pawl 5, and a handle 6 for manually operating the hydraulic cylinder is provided.

Therefore, by operating this handle 6 and extending the hydraulic cylinder, the pallet can be lifted together with the fork claws 5 from the floor surface in a horizontal state, as shown by a one-dot chain line in the figure. Conversely, by reducing the hydraulic cylinder, the pallet can be lowered onto the floor surface along with the fork claws 5 as shown by the solid line in the figure.
Further, the hand pallet truck 12 can be pulled while changing the direction by the caster wheel 2 by pulling the handle 6.

Thus, although the hand pallet truck is widely used in general, it is originally not intended for automatic conveyance because it is intended to be pulled manually.
In order to automatically convey pallets, the hand pallet truck 12 is not used, but a forklift type automatic guided vehicle (AGV) is used, or the pallet is transferred from the conveyor to the automatic guided vehicle. It was.
JP2002-19615

As described above, there has been no device for automatically towing the hand pallet truck itself, for the following reason.
(1) A forklift type automatic guided vehicle requires a pallet lifting function, and is more expensive than an ordinary cart type automatic guided vehicle.
(2) The cart type automatic guided vehicle requires unloading of the pallet at the transfer height, and the pallet lifting / lowering operation is entered, and a mechanical device must be added.

(3) There was no good way to pull a hand pallet truck directly with a tow truck.
(4) There was no easy way to connect an automated guided vehicle and a hand pallet truck.
(5) When pulling the hand pallet, the caster wheel is a wide roller, the resistance is large, and the pulling is difficult. Further, since the towing handle rotates freely, the handle rotates when towing with the automatic guided vehicle, and therefore the direction of the caster wheel is not determined, resulting in a great resistance.

  The present invention devised a method for towing a hand pallet truck that has been towed manually, and can easily tow and convey the hand pallet truck itself using a cart (automatic guided vehicle) that can travel autonomously. It is what.

Hand pallet truck towing truck according to claim 1 of the present invention for solving the aforementioned problems is a hand pallet truck towing truck having a function of traveling autonomously, a body having a caster wheel and the lifting mechanism, the body A horizontal fork claw mounted so as to be movable up and down, and the elevating mechanism is provided with a hydraulic cylinder for raising and lowering the fork claw and a handle for manually operating the hydraulic cylinder is provided in the main body. The fork claw in the hand pallet truck having a towing frame having a connection pin hole at the front portion of the fork claw is lower than the connection pin hole in the most elevated state, and the fork claw is lowered most. Connected to the connecting pin hole of the traction frame by a connecting pin at a position higher than the connecting pin hole in the state Characterized in that it has a traction receiving portion provided with a connecting pin hole to be.

Hand pallet truck towing method according to claim 2 of the present invention for solving the above problems, there a method of pulling the hand pallet truck as set forth in claim 1, utilizing hand pallet truck towing truck according to claim 1 The fork claw is raised by extending the hydraulic cylinder, and the connection pin hole of the traction frame is overlaid on the connection pin hole of the traction receiving portion, and the traction frame and the traction In the state where the caster wheel is lifted by inserting the connecting pin into the connecting pin hole of the receiving part and connecting, and reducing the hydraulic cylinder and supporting the traction frame by the traction receiving part, The hand pallet truck is pulled by the hand pallet truck tow truck.

  In the present invention, since the caster wheel which is the front wheel is in a floating state using the lifting mechanism provided in the hand pallet truck as described below, the drag by the wheel is reduced, and automatic traction conveyance can be easily realized.

(1) Simply by adding a tow frame with a connecting pin to a hand pallet truck generally used for pallet transport, it can be used as it is as a pallet transport trolley and connected to a hand pallet truck tow trolley with an autonomous running function. By doing so, automatic conveyance becomes possible.

(2) Using the fork claw lifting mechanism provided in the hand pallet truck, the pallet can be transferred to the hand pallet truck towing cart, and the caster wheel of the hand pallet truck can be floated. Towing carts became easier.

(3) If it is inconvenient for the fork pawl to become slanted when the caster wheel, which is the front wheel, slightly floats, the fork pawl can be tilted in advance and the pawl can be kept horizontal when connected.

  The modes described below as Examples 1, 2, and 3 are the best modes for carrying out the present invention.

  A hand pallet truck according to an embodiment of the present invention is shown in FIGS. FIG. 1 is a side view showing the basic structure of a hand pallet truck according to the present embodiment, FIG. 2 is a perspective view of a fork claw front part towing frame viewed obliquely from above, and FIG. 3 is a fork claw front part towing. FIG. 4 is a perspective view of the fork claw tip viewed from obliquely below, and FIG. 5 is a bottom view of the caster wheel provided in the main body viewed from below.

As shown in FIG. 1, the hand pallet truck 11 of the present embodiment has a caster wheel 12 as a front wheel and a main body 13 provided with an elevating mechanism, and a horizontal fork claw 15 mounted on the main body 13 so as to be movable up and down. .
The fork claw 15 is inserted into an insertion port of a pallet (not shown) on which various loads are placed, and a fixed ring 14 as a rear wheel is provided at the lower end of the tip.

The fixed ring 14 is attached to one end of a lever 16 pinned around the rotation axis B, and the other end of the lever 16 is connected to one end of a link 17 extending in the same direction as the fork pawl 15.
The other end of the link 17 is connected to one end of a lever 18 pinned around the rotation axis A at the front portion of the fork claw 15, and the other end of the lever 18 is connected to the main body 13.

  Further, the main body 13 is provided with a hydraulic cylinder 13a as an elevating mechanism for elevating and lowering the fork claws 15, and a vertical portion 15a is erected on the front portion of the fork claws 15, while the vertical portion 15a of the fork claws 15 is provided. The upper end of the hydraulic cylinder 13a is coupled to the hydraulic cylinder 13a, and a handle 16 is provided for manually operating the hydraulic cylinder 13a.

Accordingly, as shown by the solid arrow in FIG. 1, when the handle 16 is operated, hydraulic pressure is generated in the hydraulic cylinder 13a, and when the hydraulic cylinder 13a extends, the fork pawl 15 including the vertical portion 15a rises. At the same time, the lever 18 rotates about the rotation axis A and the link 17 moves rearward, the lever 16 rotates about the rotation axis B, and the fixed ring 14 is pushed downward.
Thereby, the pallet together with the fork claws 15 is lifted from the floor in a horizontal state.

On the contrary, as shown by the white arrow in FIG. 1, when the hydraulic pressure is released from the hydraulic cylinder 13a, the hydraulic cylinder 13a is contracted, so that the fork pawl 15 including the vertical portion 15a is lowered and the lever 18 is moved simultaneously. The link 17 is moved forward with the rotation about the rotation axis A, the lever 16 is rotated about the rotation axis B, and the fixed ring 14 is lifted upward.
As a result, the pallet together with the fork claws 15 is lowered to the floor surface in a horizontal state.

Furthermore, the hand pallet truck 11 of this embodiment is provided with a towing frame 19 having a connecting pin hole 19a.
That is, as shown in FIGS. 2 and 3, a frame-like traction frame 19 is fixed to the front portion of the fork pawl 15 so as to surround the hydraulic cylinder 13 a, and at the foremost end of the traction frame 19, A connecting pin hole 19a is provided.
The connection pin hole 19a of the tow frame 19 is used for connection to the hand pallet truck tow truck 20 as will be described later.

9 and 10 show a hand pallet truck towing cart according to an embodiment of the present invention. FIG. 9 is a perspective view of the hand pallet truck towing cart of the present embodiment as viewed from the side, and FIG. 10 is a perspective view of the hand pallet truck towing cart of the present embodiment as viewed from the front.
The hand pallet truck towing cart of the present embodiment uses a basic unit of an automatic guided vehicle having an autonomous traveling function.

  That is, as shown in FIGS. 9 and 10, the hand pallet truck towing cart 20 of this embodiment is provided with a control unit for controlling the drive unit 23 to a drive unit 23 having caster wheels 21 and fixed wheels 22. 24. An operation switch 25 for giving an instruction to the operator is mounted on the control unit 24, and other batteries, bumpers and the like are also mounted.

Therefore, the operator operates the operation switch 25 to start / stop, and the control unit 24 controls the drive unit 23 so as to autonomously travel along a magnetic tape (not shown) laid on the floor surface. .
Further, the hand pallet truck towing cart 20 of this embodiment is provided with a towing receiving portion 26 having a connecting pin hole 26a.

That is, the connecting pin hole 26a of the tow receiving portion 26 has the same shape as the connecting pin hole 19a provided in the towing frame 19 added to the hand pallet truck 11, and the connecting pin hole 26a, 19a has a connecting pin 27. Are connected by inserting.
9 and 10 show a state in which the connecting pin 27 is inserted into the connecting pin hole 26a.

  Here, when the hand pallet truck 11 is towed by the hand pallet truck towing cart 20, the height of the connecting pin hole 26a is raised and lowered together with the fork claws 15 so that the caster wheel 12 of the hand pallet truck 11 can be lifted. The position is set at a position lower than the most raised position of the connecting pin hole 19a of the tow frame 19 and higher than the most lowered position.

Accordingly, the hydraulic cylinder 13a is caused to generate hydraulic pressure, and the hydraulic cylinder 13a is extended to raise the connection pin hole 19a of the traction frame 19 to a position higher than the connection pin hole 26a of the traction receiving portion 26, and then tow The connecting pin hole 19a of the traction frame 19 is overlaid on the connecting pin hole 26a of the receiving portion 26, and the connecting pin 27 is inserted and connected to these connecting pin holes 19a, 26a to release the hydraulic pressure of the hydraulic cylinder 13a. As a result of the contraction of the hydraulic cylinder 13a, the caster wheel 12 is lifted by supporting the tow frame 19 by the tow receiving portion 26.
Since the caster wheel 12 is a wide roller and the direction is not fixed, if the hand pallet truck 11 is pulled by the hand pallet truck towing cart 20 with the caster wheel 12 installed, a large resistance is generated.

On the other hand, in this embodiment, since the caster wheel 12 is lifted from the floor surface, resistance to the floor surface does not occur, and the hand pallet truck 11 can be easily pulled by the hand pallet truck towing cart 20. It becomes possible.
The hand pallet truck towing cart 20 of the present embodiment has the drive unit 23, the control unit 24, and the operation switch 25 mounted thereon, but other options can also be mounted.

  A method of towing the hand pallet truck 11 described in the first embodiment using the hand pallet truck towing cart 20 described in the second embodiment will be described with reference to FIGS.

  6 is a perspective view showing a state in which the hand pallet truck of the first embodiment and the hand pallet truck towing cart of the second embodiment are brought close to each other, and FIG. 7 is a hand pallet truck of the first embodiment and the hand pallet of the second embodiment. It is a perspective view which shows the state combined with the truck tow cart. FIG. 8 is a perspective view showing a state where the hand pallet truck of the first embodiment is pulled by the hand pallet truck towing cart of the second embodiment while the caster wheel is lifted.

(1) First, the fork claw 15 of the hand pallet truck 11 is inserted into the pallet, the handle 16 is bent down several times, hydraulic pressure is generated in the hydraulic cylinder 13a, the fork claw 15 is lifted up, and the pallet is floated.

(2) Next, as shown in FIG. 6, the hand pallet truck 11 is moved to the vicinity of the hand pallet truck towing cart 20, and the connecting pin of the tow frame 19 is placed on the connecting pin hole 26 a of the tow receiving portion 26. The holes 19a are overlapped, and the connecting pins 27 are inserted and connected to the connecting pin holes 19a and 26a. At this time, the caster wheel 12 is in contact with the floor surface.

(3) Subsequently, when the handle 16 is operated to release the hydraulic pressure of the hydraulic cylinder 13a of the hand pallet truck 11, the hydraulic cylinder 13a contracts and as a result, the fork pawl 15 is lowered while the traction receiving portion 26 is used for traction. Since the frame 19 is supported, the caster wheel 12 is lifted.

(4) Thereafter, the hand pallet truck 11 is pulled by moving the hand pallet truck towing cart 20, and is automatically conveyed to the destination and stopped. After that, the pallet is lowered to the floor in the order of (3) → (2) → (1), and the empty hand pallet truck 11 is again in the order of (2) → (3) → (4). Return to the position.

  As described above, in this embodiment, when the hand pallet truck 11 is towed using the hand pallet truck towing cart 20, the caster wheel 12 is lifted from the floor surface. Therefore, the hand pallet truck 11 can be easily pulled by the hand pallet truck towing cart 20.

The present invention is available to a method of pulling the dolly and the hand pallet truck towing Ha command pallet truck.

It is a side view which shows the basic structure of a hand pallet truck. It is the perspective view which looked at the pulling frame of the fork nail front part from diagonally above. It is the perspective view which looked at the pulling frame of the fork nail front part from diagonally above. It is the perspective view which looked at the fork nail tip part from diagonally below. It is the bottom view which looked at the caster wheel with which a main part is equipped from the bottom. It is a perspective view which shows the state which made the hand pallet truck and the hand pallet truck tow truck approach. It is a perspective view which shows the state which combined the hand pallet truck and the hand pallet truck tow truck. It is a perspective view which shows the state by which a hand pallet truck is pulled by the hand pallet truck pulling trolley | bogie with the caster wheel floating. It is the perspective view which looked at the hand pallet truck tow cart from the side. It is the perspective view which looked at the hand pallet truck tow cart from the front. It is a side view of the hand pallet truck concerning a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Hand pallet truck 12 Caster wheel 13 Main body 14 Fixed wheel 15 Fork nail | claw 16,18 Lever 17 Link 19 Traction frame 19a Connection pin hole 20 Hand pallet truck tow cart 21 Caster wheel 22 Fixed wheel 23 Drive unit 24 Control unit 25 Operation switch 26 Towing receiving portion 26a Connecting pin hole 27 Connecting pin

Claims (2)

A hand pallet truck towing cart having a function of traveling autonomously,
A main body having a caster wheel and an elevating mechanism; and a horizontal fork claw mounted on the main body so as to be movable up and down. The elevating mechanism includes a hydraulic cylinder for raising and lowering the fork claw and the hydraulic pressure. only set the handle for manually operating the cylinder to the body, the hand pallet truck fitted with a towing frame having a connecting pin hole on the front of the fork claw
The connecting pin is connected to the connecting pin hole of the traction frame at a position lower than the connecting pin hole when the fork claw is raised most and higher than the connecting pin hole when the fork claw is lowered most. A hand pallet truck towing cart having a towing receiving portion having a connecting pin hole to be connected by means of . A method for pulling a hand pallet truck of claim 1, utilizing hand pallet truck towing truck according to claim 1, said by extending the hydraulic cylinder to raise the said fork claw, for the traction The connection pin hole of the traction frame is overlaid on the connection pin hole of the receiving part, and the connection pin is inserted and connected to the connection pin hole of the traction frame and the traction receiving part, The hand pallet truck is pulled by the hand pallet truck towing cart in a state where the caster wheel is lifted by reducing the hydraulic cylinder and supporting the towing frame by the towing receiving portion. Hand pallet truck towing method.

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