JP2003171099A - Forklift attachment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forklift attachment simply and usefully installable to a fork by eliminating the need of position adjusting operation of each fork. <P>SOLUTION: An adjusting means 4 fitting clearance between forks 2, 2 and a clearance between fitting portions 3, 3 is structured by providing a pair of upper and lower goose-necked links 19, 13 made by coupling link members 11, 12, 17, 18 journaled to the fitting portions 3, 3 and having a parallelogram shape. A first end of a wire rope 23 is coupled to a coupling shaft 20 of a first goose-necked link 19, and the second end is coupled to a coupling shaft 15 of the second goose-necked link 13, thereby structuring a hook attachment A3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment for mounting a working device such as a crane hook on left and right forks, and more specifically, a working device and a mounting for supporting the working device on a pair of left and right forks. The present invention relates to an attachment for a forklift truck, which has a section.

[0002]

2. Description of the Related Art A conventional forklift attachment B1 is, as shown in FIG. 5, a pallet-like attachment (a front-side-down "day" shape) having a pair of left and right insertion portions 28, 28 into which a pair of forks can be freely inserted and removed. The main body 27 and a crane hook (an example of a working device) 1 attached to the bottom surface side of the main body 27. That is, by inserting each fork into the corresponding insertion portion 28, 28, the crane hook 1 can be detachably attached and easily attached to the fork.

[0003]

In the conventional attachment B1 shown in FIG. 5, the fitting portions 28, 28 are laterally arranged so that a pair of forks can be inserted into the left and right insertion portions 28, 28 whose positions are fixed. When the directional spacing and the fork lateral spacing are different, it was troublesome in that the spacing between both forks had to be adjusted and aligned in advance.

Therefore, as shown in FIG. 6, the insertion portion 28 shown in FIG. 5 is formed into a main body 26 having a structure in which a plurality of insertion portions 26a, 26b and 26c are provided (three in FIG. 6). An improved attachment B2 was prototyped, which would eliminate most of the pre-positioning operations of the left and right forks. However, in this case, the main body 26, that is, the attachment B2 itself becomes large and heavy, which makes it inconvenient to handle, and there is room for further improvement.

Next, in order to eliminate the inconvenience of handling,
As shown in FIG. 7, an attachment B3 having a structure in which the fitting portions 3 and 3 are connected to both ends of the wire 25 equipped with the crane hook 1 at the center was experimentally manufactured. The attachment B3 is not large in itself,
Therefore, it is not heavy, but the crane hook 1
When a load is applied to the fitting 25, a force F for pulling the fitting portions 3 and 3 together due to the tension of the wire 25 is generated. Therefore, the forks 2 and 2, and the forks 2 and 2
Mast (not shown) on the side of the forklift that supports the vehicle
Unreasonable force is applied to the fork mounting portion of, and an unfavorable phenomenon occurs. I want to avoid it as much as possible.

An object of the present invention is to provide a forklift attachment which can be easily and conveniently mounted on a fork without requiring a position adjusting operation of each fork and without applying an excessive force to the fork or a fork mounting portion. .

[0007]

According to a first aspect of the present invention, there is provided a forklift attachment comprising a working device and a mounting part for supporting the working device on a pair of left and right forks, each mounting part having a mounting part. And a pair of left and right fitting portions fitted to the fork and adjusting means capable of freely changing the lateral distance between the fitting portions.

According to the first aspect of the invention, the adjusting means allows the lateral distance between the pair of fitting portions fitted to the forks to be variably set. Therefore, the distance between the pair of forks in the forklift, If the spacing between the fittings is different, the lateral spacing between the fittings can be adjusted to match so that the attachment with the working device can be attached to the pair of forks. it can. This is labor-intensive and quicker than the operation of moving the heavy fork and adjusting the position in the left-right direction with respect to the mast twice.

According to a second aspect of the present invention, in the configuration of the first aspect, the adjusting means includes a supporting member that is installed over the pair of fitting portions in a state where the working device is installed, and a predetermined one of the supporting members. It is characterized in that it is constituted by a screwing mechanism for locking and fixing the fitting portion to the position and releasing it.

According to the second aspect of the present invention, the fitting portion and the supporting member can be fixed and released relative to each other by operating the screwing mechanism, so that the fitting portion and the supporting member can be laterally moved. By adjusting the relative position, the space between the fitting parts
It is possible to match the gap between the forks at that time, and the fitting portions and the support member can be fixed relative to each other in that state. That is, the adjusting operation of the adjusting means can be performed by performing the operation of the screw fastening mechanism twice. It should be noted that, in the case of a very small dimensional adjustment of the distance between the forks and the distance between the fitting portions, or depending on the type and usage of the working device, the position adjustment between the one fitting portion and the support member may be sufficient. It is possible.

According to a third aspect of the present invention, in the configuration of the first aspect, the adjusting means is equipped with a boss portion attached to each fitting portion and a working device, and is screwed over each boss portion. In addition, the screwing direction of one boss and the rod and the screwing direction of the other boss and the rod are set to be opposite to each other. It is characterized by.

According to the third aspect of the present invention, the rod-shaped body having the working device is fitted with a positive screw in one fitting portion and with a reverse screw in the other fitting portion. Since the fitting parts are screwed in opposite directions to each other, the lateral distance between the fitting parts can be variably adjusted by rotating the rod-shaped body, and the distance between the forks at that time can be adjusted. Can be matched to. According to this means, it is possible to match the movement amount of each fitting portion and the rod-shaped body with the rotation operation of the rod-shaped body, and the positional relationship between the working device and both the fitting portions is changed even if the adjustment operation is performed. It is possible not to.

According to a fourth aspect of the present invention, in the first aspect, the adjusting means includes a pair of waist bending links formed by pivotally connecting link members pivotally connected to each fitting portion, one of which is a front surface. It is configured so that it is pivotally connected to the working device with a bending angle that is convex upward when viewed, and the other is bent with a bending angle that is convex downward when viewed from the front. It is characterized in that one end of a rope member wound around a supported ring is connected to a connecting portion of one waist bending link, and the other end is connected to a connecting portion of the other waist bending link.

According to the structure of claim 4, the lateral distance between the fitting portions can be variably set by changing the bending angle of the pair of waist bending links. Therefore, the distance between the forks can be set to the fitting portion. The attachments can be attached to the pair of forks at the same intervals. Then, each end of the rope member wound around the wheel body pivotally supported by the working device is connected to each of the waist bending link whose bending angle is convex upward and the waist bending link whose convex angle is downward. , Half of the load acting on the work device acts evenly on each waist break link, and the waist break link that is convex upward pushes the fitting parts apart from each other, and the waist break link that is convex downward is fitted. Pull the parts closer together. As a result, the lateral force acting on the fitting portions is canceled out, and the force for moving the forks laterally does not occur even if the load is applied to the working device.

A fifth aspect of the present invention is characterized in that, in the first to fourth aspects, the working device is a crane hook, and the crane hook on which various light and heavy loads act is simple and convenient. Can be mounted on the fork of a forklift.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

First Embodiment FIG. 1 shows a first attachment A1 for mounting a crane hook 1 which is an example of a working device on a pair of forks 2 and 2 of a forklift (not shown). .
The first attachment A1 is a crane hook 1 and
A pair of left and right forks 2 and 2 is provided with a mounting portion S for supporting the crane hook 1.

The mounting portion S is a pair of left and right fitting portions 3 and 3 fitted to the forks 2 and 2, and the fitting portions 3 and 3.
It is provided with the adjusting means 4 capable of freely changing the lateral distance between each other, that is, the variable adjustment and the locking and maintaining at the adjusted position. The fitting portion 3 is formed by a square pipe having a size that allows the fork 2 to be inserted and removed and mounted, and a boss portion 6 with a screwing mechanism 5 is fixed to the bottom surface side.

The adjusting means 4 is a rod member (an example of a supporting member) 7 which is installed over the boss portions 6 attached to each fitting portion 3 in a state where the crane hook 1 is equipped, and the rod thereof. It is composed of a pair of screw fastening mechanisms 5 and 5 for locking and fixing and releasing each boss portion 6 at a predetermined position of the material 7. The screwing mechanism 5 is capable of fixing the fitting portion 3 and the bar member 7 relative to each other by a screw tightening operation, and permitting the relative movement of the fitting portion 3 and the bar member 7 by a screw loosening operation.

A boss 1a of the crane hook 1 is externally fitted to and mounted on a bar 7 so that the boss 1a can be slid relative to the bar 7, and can be fixed to a predetermined position of the bar 7 by an adjusting screw 8. In this way, the position of the crane hook 1 with respect to the rod 7 in the left-right direction can be adjusted and fixed, which is convenient.

In the first attachment A1, when the lateral spacing between the fitting portions 3 and 3 and the lateral spacing between the forks 2 and 2 are different from each other, the left and right screw fastening mechanisms 5 and 5 are provided. Is loosened to adjust the position of the fitting portion 3 with respect to the bar 7. At that time, an operation is performed to match the distance between the left and right fitting portions 3 and 3 with the distance between the forks 2 and 2 so that the crane hook 1 is located at the center of the left and right fitting portions 3 and 3. Then, the first attachment A1 is inserted into both forks 2 and 2 and mounted.

If the adjusting screw 8 is operated, the crane hook 1 is intentionally set at a position deviated from the center of both fitting portions 3 and 3, or the cooperative operation with only one screw fixing mechanism 5 is performed. The crane hook 1 to the left and right fittings 3,3
It is possible to match the distance between the fitting portions 3 and 3 with the distance between the forks 2 and 2 while being positioned at the center of.

-Second Embodiment- FIG. 2 shows a second attachment A2 for mounting the crane hook 1 on the pair of forks 2,2. The second attachment A2 is the crane hook 1
And a mounting portion S for supporting the crane hook 1 on the pair of left and right forks 2, 2. The mounting portion S is
It has a pair of left and right fitting portions 3 and 3 which are fitted to the respective forks 2 and 2, and an adjusting means 4 which can freely change the lateral distance between the fitting portions 3 and 3.

The adjusting means 4 is equipped with a boss portion 6 attached to each fitting portion 3 and 3, and a crane hook 1, and
It is configured with a screw shaft (an example of a rod-shaped body) 9 which is installed in a screwed state across each boss portion 6, 6. The left (one) boss portion 6 and the screw shaft 9 are screwed to the left, and the right (other) boss portion 6 and the screw shaft 9 are screwed to the right, and one end of the screw shaft 9 is attached. A handle 10 is attached to the.

That is, the left half of the screw shaft 9 has a left screw 9a formed by forming a spiral in the opposite direction to a general screw, and the right half of the screw shaft 9 has a general right screw. 9b is formed. Therefore, when the handle 10 is rotated to one side, both the fitting portions 3 and 3 are both at the same speed (defined by the movement amount of the fitting portion 3 per unit rotation number of the screw shaft 9). When you move toward, and rotate to the other,
Both the fitting portions 3 and 3 move toward the direction away from the crane hook 1 at the same speed.

That is, if the handle 10 is rotated to one side, the interval between the fitting parts 3 and 3 can be narrowed, and if it is rotated to the other side, the interval between the fitting parts 3 and 3 can be widened. In this structure, the fitting portion S is composed of the fitting portions 3 and 3 and the screw shaft 9.
However, the screw shaft 9 and the boss portions 6 and 6 respectively constitute the adjusting means 4.

Third Embodiment FIGS. 3 and 4 show a third attachment A3 for mounting the crane hook 1 on the pair of forks 2 and 2. As shown in FIG. The third attachment A3 is characterized by including an upper waist bend link 19 that is convex upward in a front view and a lower waist bend link 13 that is convex downward in a front view. The upper waist bending link 19 which is convex upward in the front view includes an upper left arm (an example of a link member) 17 pivotally connected to the left fitting portion 3 via a support shaft 14, and a right fitting portion 3
The upper right arm (an example of a link member) 18 pivotally connected to each other via a support shaft 14 is pivotally connected to each other via a connection shaft 20. Further, the lower waist bending link 13, which is convex downward in the front view, includes a lower left arm (an example of a link member) 11 pivotally connected to the left fitting portion 3 via a support shaft 14, and a right fitting portion 3. And a lower right arm (an example of a link member) 12 pivotally connected to each other via a support shaft 14 and the distal end portions thereof are pivotally connected to each other via a connection shaft 15. Then, the crane hook 1 is suspended and supported by the wire rope (an example of a rope member) 23 laid across the upper and lower connecting shafts 20 and 15 via the pulley-shaped wheel body 21 to form the third attachment A3. There is.

That is, the upper and lower waist bending links 19 and 13 constitute the adjusting means 4, and the crane hook 1
Is formed with a pair of stay portions 1b, 1b extending in a bifurcated shape, and the wheel body 21 is rotatably supported by a shaft 22 supported by the stay portions 1b, 1b so as to support the load distribution mechanism K. Is configured. When a load acting on the crane hook 1 is present due to the load distribution mechanism K, the lower waist bending link 13 alone exerts a force (first force) to draw the forks 2 and 2 toward each other, but the upper waist bending link 19 causes the fork. Since a force (second force) for moving the second and second parts away from each other is generated, the first force and the second force that act in opposite directions to each other are generated.
Since they are equal to each other, they cancel each other out,
The forks 2 and 2 have the advantage that they cannot be attracted to each other.

Incidentally, as described above, the preferable advantage that the pulling force of the left and right forks 2 and 2 is not generated by the load acting on the working apparatus 1 is the first and second attachments A1 shown in FIGS. , A2 can also be obtained.

In the third attachment A3, the wire rope 23 is installed over the front protruding portion of the lower connecting shaft 15 and the rear protruding portion of the upper connecting shaft 20, and the diameter of the wheel body 21 is set to an appropriate size. Is set so that the wire rope 23 does not come into contact with any of the waist bending links 13 and 19 and the load distribution mechanism K can function satisfactorily. In addition, 24 in FIG. 4 is a washer for preventing the wire rope 23 mounted on each connecting shaft 15 and 20 from coming off.

[Other Embodiments] As the working device 1, various devices such as a crane hook, a hydraulically driven clamping clamp, and a device for suspending a heavy object such as a hanger bar can be considered. Further, the fitting portion 3 may be configured by using a downwardly facing “U” -shaped channel material having an open bottom, or a channel material having an open-type cross section in which the central portion of the bottom surface is lacking.

[0032]

As described above, in the attachment for a forklift according to the present invention, since the adjusting means for adjusting the lateral gap between the left and right fitting portions fitted to the fork is provided, it is easy and easy. The position of the fitting part can be adjusted and it can be attached to the fork, so compared to the conventional method where the position of the heavy fork was changed, the adjustment operation for attaching and detaching to the fork can be performed easily, quickly and easily. I was able to.

A working device is provided for the one that employs an adjusting means which is constructed by suspending a supporting member or a rod-like member on the left and right fitting portions, a pair of waist bending links, and a rope member that is spanned over each of these links. The structure is advantageous in that the load acting on the work device does not generate a lateral force in the direction in which the pair of forks come close to each other, and there is no inconvenience such as damage to the fork support portion. .

If the working device is a crane hook,
It is possible to provide an attachment that is suitable and convenient for using the forklift as a means for suspending an object or the like.

[Brief description of drawings]

FIG. 1 is a front view showing an attachment according to a first embodiment.

FIG. 2 is a front view showing an attachment according to a second embodiment.

FIG. 3 is a front view showing an attachment according to a third embodiment.

FIG. 4 is a side view of the partial cutout of FIG.

FIG. 5 is a perspective view showing a conventional attachment.

FIG. 6 is a front view showing an improved conventional attachment.

FIG. 7 is a front view showing a conventional attachment which has been further improved.

[Explanation of symbols]

1 Working device Two forks 3 Fitting part 4 Adjustment means 5 screwing mechanism 7 Support member 9 Rods 11, 12, 17, 18 Link member 13,19 Hip break link 21 wheels 23 Rope member S mounting part

Claims (5)

[Claims] 1. A forklift attachment comprising a working device and a mounting part for supporting the working device on a pair of left and right forks, wherein the mounting part is fitted to each of the forks. An attachment for a forklift truck having a pair of fitting portions and an adjusting means capable of freely changing a lateral distance between the fitting portions. 2. The adjusting means locks the fitting part at a predetermined position of a support member that is installed over the pair of fitting parts in a state where the working device is equipped. The attachment for a forklift according to claim 1, wherein the attachment for a forklift is configured with a screwing mechanism that can be fixed and released. 3. The adjusting means includes a boss portion attached to each of the fitting portions, and a rod-shaped body that is equipped with the working device and is erected in a screwed state across the boss portions. It is comprised, and the screwing direction of the said one boss part and the said rod-shaped body, and the screwing direction of the said other boss part and the said rod-shaped body are set to the mutually opposite direction. Forklift Attachment. 4. The adjusting means comprises a pair of waist bending links formed by pivotally connecting link members pivotally connected to each of the fitting portions, each of which has a bending angle at which one is convex upward in a front view. It is configured so as to be pivotally connected in a state in which it is applied and the other is provided with a bending angle that is convex downward in front view, and is wound around a wheel body pivotally supported by the working device. The attachment for a forklift according to claim 1, wherein one end of the rope member is connected to a connecting portion of the one waist bending link, and the other end is connected to a connecting portion of the other waist bending link. 5. The attachment for a forklift according to claim 1, wherein the working device is a crane hook.