JP2004149311A - Mast apparatus of loading/unloading vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce total height, to prevent the submergence of the movable section of an elevation body, to increase the maximum lift height as much as possible, and to reduce costs in a mask apparatus called a mariner fork for performing loading/unloading work over the upper and lower portions of the ground surface. <P>SOLUTION: The mast apparatus comprises a first mast 2; a second mast 3; a third mast 4, a fourth mast 5, the elevation body 6; a fork 7; a first lift cylinder 8; a second lift cylinder 9; a first guide wheel 10; a first cable 11; a second guide wheel 12; and a second rope 13. Especially in conveyance drive, the respective masts 2, 3, 4, 5 are aligned nearly at the same height, the elevation body 6 is positioned at the upper level of the fourth mast 5, and a vertical piece 21 is formed long so that a horizontal piece 22 of the fork 7 is positioned nearly at the middle level of the fourth mast 5. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mast device called a marina fork capable of performing cargo handling work above and below the ground, and more particularly to an improvement of a four-mast type using two lift cylinders.
[0002]
[Prior art]
A mast device called a marina fork mainly performs a so-called maritime operation of, for example, pulling a boat or the like floating on the sea surface from a quay and storing it in a boat yard or the like, and, of course, can also perform general cargo handling work only above the ground. Things.
Conventionally, as this type of mast device, for example, the following is known.
(1) Three-stage mast type using a single lift cylinder (see Patent Document 1).
(2) A three-stage mast type using two lift cylinders (see FIGS. 1 and 2 of Patent Document 2).
(3) Three-stage mast type using a two-stage lift cylinder (see FIGS. 3 to 5 of Patent Document 2 and Patent Document 5)
(4) Four lift masts using two lift cylinders, and a fork and an elevating body (fork claw and second finger board) supporting the fork are always positioned below the fourth mast (No. 8 of Patent Document 3). (See figure)
(5) A five-stage mast type using two lift cylinders (see Patent Document 4).
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 49-43803 [Patent Document 2]
Japanese Utility Model Publication No. 51-43564 [Patent Document 3]
Japanese Utility Model Publication No. 56-121094 [Patent Document 4]
Japanese Utility Model Publication No. 23939/1992 [Patent Document 5]
Japanese Patent Publication No. Hei 5-503279
However, in the above (1) and (2), the overall height during transportation and running was high, and the movable parts (rollers and the like) of the elevating body supporting the fork were easily submerged.
When the total height is increased, the entrance of a warehouse or a storage must be increased, and the workability is very poor because the entrance is easily affected by an upper obstacle on the passage. Of course, the center of gravity was also high, which was disadvantageous in running stability.
When the movable part of the elevating body is submerged, the movable part is easily rusted by seawater, and the maintainability is very poor in order to prevent this.
In the case of the above (3), although the overall height during transportation can be reduced, the cost is high due to the use of the two-stage lift cylinder, and the movable part of the elevating body supporting the fork is easily submerged.
In the above (4), since the fork and the elevating body supporting the fork are always located below the fourth mast, the maximum lift is reduced accordingly, and the movable part of the elevating body supporting the fork is easily submerged. Was.
In the case of the above (5), the moving mast collides during transportation and running, so that the overall height is high and the number of masts is large, so that the structure is complicated and the cost is high.
[0005]
[Problems to be solved by the invention]
In short, all of the conventional ones have advantages and disadvantages, the overall height can be reduced, the submersion of the movable part of the elevating body can be prevented, the maximum lift can be as high as possible, and the cost cannot be reduced.
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in order to solve the problem. The object of the present invention is to reduce the overall height, prevent submersion of movable parts of the elevating body, and increase the maximum height. It is an object of the present invention to provide a mast device which can be made as high as possible and can reduce the cost.
[0006]
[Means for Solving the Problems]
The mast device of the present invention is basically provided with a first mast supported on the body of a cargo handling vehicle, a second mast provided on the first mast so as to be able to move up and down, and a mast device provided on the second mast so as to be able to move up and down. A third mast, a fourth mast provided on the third mast so as to be able to move up and down, an elevating body provided on the fourth mast so as to be able to move up and down, a fork provided on the elevating body, A first lift cylinder for raising and lowering the second mast, a second lift cylinder for raising and lowering the fourth mast with respect to the third mast, a first guide wheel rotatably provided above the second mast, A first rope interposed between the first mast and the third mast, a second guide wheel rotatably provided above the fourth mast, and a third mast and elevating And a second cable interposed between the body and the second cable hung by a second guide wheel. Occasionally, the masts are aligned at approximately the same height, the elevating body is located above the fourth mast, and the vertical piece is formed long so that the horizontal piece of the fork is located almost in the middle of the fourth mast. There is a characteristic.
[0007]
At the time of transport traveling, each mast is aligned at substantially the same height, the first lift cylinder and the second lift cylinder are in the shortest state, and the elevating body is located above the fourth mast, The horizontal piece is located approximately in the middle of the fourth mast.
When the first lift cylinder is extended from such a state, the second mast rises with respect to the first mast, and the third mast and the subsequent masts with respect to the second mast by the first guide wheel and the first cable. Rises at twice the speed and reaches the maximum lift position.
When the second lift cylinder is extended from the transport traveling position, the fourth mast descends with respect to the third mast, and the fourth mast is moved with respect to the fourth mast by the second guide wheel and the second cable, so that the fourth mast can be moved downward. The object descends at twice the speed to the lowest lift position. At this time, the elevating body is located below the fourth mast, and the horizontal piece of the fork is located significantly below the lower end of the fourth fork.
[0008]
At the transport travel position, the masts are aligned at substantially the same height, so that the so-called overall height can be reduced.
In the maximum lifting position, the lifting height is higher than the fourth mast, so that the maximum lifting is increased accordingly.
At the lowest elevation position, the lifting body is located below the fourth mast, but the horizontal piece of the fork is located significantly below the lower end of the fourth mast, so that the lifting body does not submerge.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic side view showing the mast device of the present invention during transportation traveling. FIG. 2 is a view similar to FIG. FIG. 3 is a view similar to FIG. FIG. 4 is a side view showing a cargo handling vehicle equipped with the mast device of the present invention.
[0010]
The mast device 1 includes a first mast 2, a second mast 3, a third mast 4, a fourth mast 5, a lifting body 6, a fork 7, a first lift cylinder 8, a second lift cylinder 9, a first guide wheel 10, The first rope 11, the second guide wheel 12, and the second rope 13 constitute a main part thereof, and are provided on the front side of the cargo handling vehicle 50.
[0011]
The cargo handling vehicle 50 includes a vehicle body 51, front and rear wheels 52 rotatably provided on the vehicle body 51, a motor 53 such as an engine provided on the rear side of the vehicle body 51 to rotate the wheels (front wheels) 52, A driver's seat 54 provided on the front side, a handle 55 provided on the front side of the driver's seat for turning the wheels (rear wheels) 52, a head guard 56 provided to cover the upper part thereof, and the like are provided. .
[0012]
The first mast 2 is supported by the vehicle body 51 of the cargo handling vehicle 50, and in this example, a lower portion thereof is supported by the front side of the vehicle body 51 so as to be able to tilt back and forth, and is supported by a tilt cylinder 57 provided on the vehicle body 51. It is to be tilted back and forth.
[0013]
The second mast 3 is provided on the first mast 2 so as to be able to move up and down. In this example, the second mast 3 has substantially the same height as the first mast and is provided inside the first mast 2 so as to be able to move up and down. On the lower side of the second mast 3, upper and lower rollers 14 (only the end rollers are shown, and the side rollers are not shown; the same applies hereinafter) 14 are provided rotatably so as to smoothly move up and down.
[0014]
The third mast 4 is provided on the second mast 3 so as to be movable up and down. In this example, the third mast 4 has substantially the same height as the first mast 2 and is provided on the front side of the second mast 3 so as to be movable up and down. . A lift bracket 15 that can move up and down inside the second mast 3 is attached to the lower rear part of the third mast 4, and upper and lower rollers 16 for smoothing up and down are rotatably provided. Have been.
[0015]
The fourth mast 5 is provided on the third mast 4 so as to be able to move up and down. In this example, the fourth mast 5 has substantially the same height as the first mast 2 and is provided so as to be able to move up and down inside the third mast 4. . On the upper side of the fourth mast 5, upper and lower rollers 17 for smooth lifting and lowering are rotatably provided.
[0016]
The respective masts, that is, the first mast 2, the second mast 3, the third mast 4, and the fourth mast 5 are made to have the same height during transportation.
[0017]
The lifting body 6 is provided on the fourth mast 5 so as to be able to move up and down. In this example, the lifting body 6 is provided with a lift bracket 18 provided inside the fourth mast 5 so as to be able to move up and down and a finger bar 19 installed on the lifting bracket 18. Have. On the lift bracket 18 of the elevating body 6, upper and lower rollers 20 for rotatably moving up and down are provided rotatably. The lifting / lowering body 6 is positioned above the fourth mast 5 during transportation.
[0018]
The fork 7 is provided on the elevating body 6, and in this example, a pair of right and left is provided. Each of the forks 7 includes a vertical piece 21 and a horizontal piece 22 extending forward from a lower part thereof. The upper part of the piece 21 is suspended on the finger bar 19 of the lifting body 4. The vertical piece 21 of the fork 7 is formed to be long so that the horizontal piece 22 is located substantially at the middle of the fourth mast 5 during transportation.
[0019]
The first lift cylinder 8 raises and lowers the second mast 3 with respect to the first mast 2. In this example, the first lift cylinder 8 is a pair of left and right, and each has a cylinder main body 23 and a piston that can expand and contract with respect to this. A rod 24 is provided between the upper and lower cylinder supports 25 provided above the lower part of the first mast 2 and the upper part of the second mast 3 with the piston rod 24 side facing upward. The first lift cylinder 8 is a single-acting cylinder in which the tail chamber is on the pressure side.
[0020]
The second lift cylinder 9 raises and lowers the fourth mast 5 with respect to the third mast 4. In this example, the second lift cylinder 9 is a single one disposed at the center in the left-right direction. A piston rod 27 which can be extended and contracted, and is provided between the upper and lower cylinder supports 28 provided on the upper part of the third mast 4 and the lower part of the fourth mast 5 with the piston rod 27 side facing up. I have. The second lift cylinder 9 is a single-acting cylinder in which the piston rod chamber is on the pressure side.
[0021]
The first guide wheel 10 is rotatably provided above the second mast 3, and in this example, is a sheave and is rotatably mounted around a horizontal axis. The first guide wheel 10 is a pair of left and right corresponding to the first lift cylinder 8.
[0022]
The first cable 11 is interposed between the first mast 2 and the third mast 3 and spans the first guide wheel 10. In this example, the first cable 11 is a chain, and one end is a first mast. The other end is connected to the lift bracket 15 of the third mast 4 while being fixed to the upper part of the mast 2. The first cable 11 is a pair of left and right corresponding to the first lift cylinder 8.
[0023]
The second guide wheel 12 is rotatably provided above the fourth mast 5, and in this example, is a sheave, and is rotatably mounted about a horizontal axis. The second guide wheel 12 is a single unit corresponding to the second lift cylinder 9.
[0024]
The second cable 13 is interposed between the third mast 4 and the elevating body 6 and is bridged by the second guide wheel 12. In this example, the second cable 13 is a chain, and one end of the second mast 4 is the third mast. 2 and the other end is connected to a lift bracket 18 of the elevating body 6. The second cable 13 is formed as a single unit in response to the second lift cylinder 9.
[0025]
Next, the operation will be described based on such a configuration.
During transportation traveling, as shown in FIG. 1, the masts 2, 3, 4, and 5 are aligned at substantially the same height, and the first lift cylinder 8 and the second lift cylinder 9 are in the shortest state. The elevating body 6 is located above the fourth mast 5, and the horizontal piece 22 of the fork 7 is located substantially at the middle of the fourth mast 5.
When the first lift cylinder 8 is extended from such a state, the second mast 3 is raised with respect to the first mast 2 as shown in FIG. Therefore, the second mast 3 and the third mast 4 and thereafter rise at double speed and reach the maximum lift position.
When the second lift cylinder 9 is extended from the transporting traveling position shown in FIG. 1, the fourth mast 5 is lowered with respect to the third mast 4 as shown in FIG. According to the line 13, the members following the lifting body 6 descend at twice the speed with respect to the fourth mast 5 to reach the lowest lifting position. At this time, the elevating body 6 is located below the fourth mast 5 and the horizontal piece 22 of the fork 7 is located below the lower end of the fourth fork 5 because the vertical piece 21 is longer.
[0026]
Therefore, the cargo handling vehicle 50 equipped with such a mast device 1 can travel on the ground A with the mast device 1 in the transporting traveling state shown in FIG. 3 and the fork 7 can be used to scoop a boat or the like D floating on the sea surface C.
When the scooping of the boat D or the like is completed, the mast device 1 is returned to the transporting and running state of FIG. 1 in the reverse order to the above, and after traveling to the boat yard (not shown), it can be stored here.
Since the boat yard is usually in the form of a rack, the mast device 1 is set to the maximum lifting state shown in FIG.
When floating a boat or the like D on the sea surface C from the boathouse, the procedure described above may be reversed.
[0027]
At the transport travel position, as shown in FIG. 1, the masts 2, 3, 4, and 5 are arranged at substantially the same height, so that the so-called total height H can be reduced.
In the maximum lift position, as shown in FIG. 2, since the lifting body 6 is located above the fourth mast 5, the maximum lift is increased by that amount.
At the lowest lift position, as shown in FIGS. 3 and 4, although the elevating body 6 is located below the fourth mast 5, the horizontal piece 22 of the fork 7 has formed the vertical piece 21 longer, so that the fourth mast Since the movable portion such as the roller 20 of the elevating body 6 does not sink in the water, the movable portion is located below the lower end of the lifter 5.
[0028]
The first lift cylinder 8 is a pair of left and right in the above example, but is not limited to this, and may be a single one, for example.
The second lift cylinder 9 is a single one in the above example, but is not limited to this, and may be, for example, a pair of left and right.
In the above example, the second lift cylinder 9 is disposed with the piston rod 27 side facing up, but is not limited thereto, and may be disposed with the piston rod 27 side facing down.
Although the first guide wheel 10 and the second guide wheel 12 are sheaves in the above example, the invention is not limited thereto, and may be, for example, pulleys.
The first cable 11 and the second cable 13 are chains in the above example, but are not limited thereto, and may be, for example, wires.
In the above example, the first cable 11 has one end connected to the first mast 2, but the present invention is not limited to this. For example, the first cable 11 may be connected to the cylinder body 23 of the first lift cylinder 8.
Although the rollers 14 are provided above and below the lower side of the second mast 3 in the above example, the present invention is not limited to this. For example, the upper part of the first mast 2 and the It may be provided at the lower part.
In the above example, the rollers 17 are provided above and below the fourth mast 5, but are not limited to this. For example, as in a standard mast device, the lower part of the third mast 4 and the upper part of the fourth mast 5 May be provided.
[0029]
【The invention's effect】
As described above, according to the present invention, the following excellent effects can be obtained.
(1) First mast, second mast, third mast, fourth mast, lifting body, fork, first lift cylinder, second lift cylinder, first guide wheel, first cable, second guide wheel, In particular, during transport, each mast is aligned at approximately the same height, the elevating body is positioned above the fourth mast, and the horizontal piece of the fork is positioned approximately in the middle of the fourth mast Since the vertical pieces are formed as long as possible, the overall height can be reduced, the movable part of the elevating body can be prevented from being submerged, the maximum height can be increased as much as possible, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing a state in which a mast device of the present invention is transported.
FIG. 2 is a view similar to FIG.
FIG. 3 is a view similar to FIG.
FIG. 4 is a side view showing a cargo handling vehicle equipped with the mast device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Mast device, 2 ... 1st mast, 3 ... 2nd mast, 4 ... 3rd mast, 5 ... 4th mast, 6 ... Elevating body, 7 ... Fork, 8 ... 1st lift cylinder, 9 ... 2nd lift Cylinder, 10 ... first guide wheel, 11 ... first rope, 12 ... second guide wheel, 13 ... second rope, 14, 16, 17, 20 ... roller, 15, 18 ... lift bracket, 19 ... finger Bar, 21 vertical piece, 22 horizontal piece, 23, 26 cylinder body, 24, 27 piston rod, 25, 28 cylinder support, 50 cargo handling vehicle, 51 body, 52 wheel, 53 motor 54 ... Driver seat, 55 ... Handle, 56 ... Head guard, 57 ... Tilt cylinder, A ... Ground, B ... Wharf, C ... Water surface, D ... Boat, etc. H ... Overall height.

Claims (1)

The first mast supported by the body of the cargo handling vehicle, the second mast provided to be able to move up and down on the first mast, the third mast provided to be able to move up and down to the second mast, and the up and down movement to the third mast A fourth mast provided, a lifting body provided to be able to move up and down on the fourth mast, a fork provided on the lifting body, a first lift cylinder for lifting and lowering the second mast with respect to the first mast, A second lift cylinder that raises and lowers the fourth mast with respect to the three masts, a first guide wheel rotatably provided above the second mast, and is interposed between the first mast and the third mast. A first cable hung on the first guide wheel, a second guide wheel rotatably provided above the fourth mast, and a second guide interposed between the third mast and the elevating body. It has a second cable hung on a car, and each mast is aligned at approximately the same height during transportation. Together, the lifting body is located above the fourth mast, mast assembly of cargo handling vehicle, characterized in that the vertical piece horizontal piece of the fork is to sit in a substantially middle of the fourth mast is formed longer.

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