JPH0753196A - Fork for elevator device - Google Patents

Abstract

PURPOSE:To use a fork member as stand, too, by constituting the fork from a supporting member installed on the slider of an elevator device and a fork member which is supported in a turnable manner on the supporting member through a bracket and whose top end is directed forward or rearward from the elevator device. CONSTITUTION:An elevator device A is equipped with an inner mast 6 which is supported in a free rising and lowering on an outer mast 5 through a reciprocating type hydraulic cylinder, and a slider 7 which is supported in free rising and lowering on the inner mast 6 and has a fork 8. The fork 8 is constituted of a supporting member 50 installed on the slider 7 and a fork member 54 which is supported in a turnable manner on the supporting member 50 through a bracket 53 and whose top edge is directed forward or rearward from the elevator device. Accordingly, the fork member 54 is grounded by lowering the slider 7, and the elevator device A can be supported in an erection state by using the form member 54 as stand.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fork which is mounted in front of a self-propelled vehicle and is attached to a lifting device for using the vehicle as a forklift and which can be used as a stand for supporting the lifting device. Is.

[0002]

2. Description of the Related Art At worksites, cargo handling sites, warehouses, etc.
Forklifts are often used as a means for efficiently carrying luggage.

This forklift truck has a structure in which a lifting device having a fork and a mast for raising and lowering the fork is mounted in front of a self-propelled vehicle.

The mast of the lifting device is composed of an outer mast fixed to the vehicle body side and an inner mast supported by the outer mast so as to be movable up and down, and a fork is attached to a slider supported by the inner mast so as to be movable up and down.

A hydraulic cylinder is incorporated between the outer mast and the inner mast, and the inner mast and the slider are connected via a chain.

When the hydraulic cylinder is expanded and contracted and the inner mast is moved up and down, the slider is also moved up and down in conjunction with this, so that the fork moves up and down. The vertical movement of the fork raises and lowers the load. I am trying.

[0007]

In the forklift described above, since the vehicle and the lifting device are generally integrated, the self-propelled vehicle cannot be used for other purposes.
Further, it was not possible to attach the lifting device to any vehicle and temporarily use the vehicle as a forklift.

Therefore, if only a lifting device that supports the fork so that it can be lifted up and down is configured independently, and if a bracket for attaching and detaching the lifting device to the vehicle is attached to the outer mast of this lifting device, this lifting and lowering operation is required when the forklift is required. The device can be mounted on the front of the tractor, for example, and the tractor can be used as a forklift.

However, if the lifting device is configured independently, a stand for supporting the lifting device is required to support the lifting device in an upright state when the lifting device is not used, and the number of parts of the lifting device itself increases. There was a problem of doing.

[0010]

[Means for Solving the Problem] An outer mast, an inner mast which is supported by the outer mast so as to be vertically movable,
The slider is supported by the inner mast so as to be able to move up and down, and is composed of a return hydraulic cylinder that is interposed between the outer mast and the inner mast and moves up and down the inner mast.The self-propelled vehicle is used as a forklift. Fork attached to the slider of the lifting device that is detachably supported,

The support member is attached to the slider, and the fork member is rotatably supported by the support member via a bracket, and the tip of the fork member faces either the front or the rear of the lifting device.

[0012]

As described above, the fork member of the fork attached to the lifting device is directed forward and backward, so that when the lifting device is used as a forklift, the fork member is directed forward and the lifting device alone is used. When supporting in an upright state, the fork member is directed rearward.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 3 to 16 show a lifting device (A) which is detachably mounted on a self-propelled vehicle and is equipped with a fork (8) according to the present invention. The description will be given first regarding the lifting device (A).

This lifting device (A) comprises an outer mast (5),
An inner mast (6) that is supported by the outer mast (5) so as to be able to move up and down through a return hydraulic cylinder (19), and a fork (8) that is supported by the inner mast (6) so as to be able to move up and down.
And a slider (7) having.

Outer mast (5) of the lifting device (2) described above
As shown in FIGS. 3 to 6, a pair of guide bars (10) (10) made of channel materials having a U-shaped cross section and arranged in parallel with their openings facing each other, and the guide bar (10). In order to support (10) in a parallel state, the first cross-link is formed on the rear surface of the guide bar (10) (10) so as to be orthogonal to the guide bar (10) (10).
The skeleton is formed by the fourth columns (11), (12), (13) and (14).

(15) is the first to third columns (11), (12) and (13)
The upper bracket that is fixed to the center of the rear surface and is used when attaching the lifting device (A) to a tractor, etc., (16) (16) is the lower part that is fixed to the lower rear surface of the guide bar (10) (10). It is a bracket.

(17) is an upper cylinder support plate fixed to the center of the front surface of the second support column (12), and (18) is a lower cylinder fixed to the center of the front surface of the fourth support column (14). These support plates are the support plates (17) and (18) that allow the inner mast (6) to move back and forth in the center of the outer mast (5) by a return hydraulic cylinder (19).
To support.

The outer mast (5) slidably supports the inner mast (6), so that the first (20) is rotatably supported at the upper two places on the inner side of each guide bar (10).
This is the first guide roller (20)
Are formed so as to contact the inner surface of a slide bar (25) of the inner mast (6) described later.

(21) is a second guide rotatably supported in the guide bar (10) to prevent the inner mast (6) slidably supported by the outer mast (5) from rattling in the left-right direction. A roller and this second guide roller
The rotation axis of (21) is orthogonal to the rotation axis of the first guide roller (20) and is formed so as to come into contact with the bottom surface of a slide bar (25) of the inner mast (6) described later.

The inner mast (6) supported by the outer mast (5) so as to be able to move up and down is, as shown in FIGS. 7 to 10, a pair of slide bars made of H steel and arranged in parallel.
(25) In order to support the slide bar (25) and (25) in parallel with the slide bar (25) and (25), they are orthogonal to the slide bar (25) and
Fifth cross-linked bridge at the top and bottom of slide bar (25) (25)
And a sixth strut (26) (27) form a skeleton, the fifth strut (26) is on the rear side of the slide bar (25), and the sixth strut (27) is the slide bar (25). It is fixed on the front side of.

Reference numeral (28) is a chain sprocket arranged at the upper and lower ends of the inner mast (6), and two chains are provided between the chain sprockets (28) and (28) arranged above and below, respectively. ) Are crosslinked, and both ends of each chain (29) are, for example, the outer mast (5).
Is fixed to the second column (12) of the.

Reference numeral (30) is a third guide roller rotatably supported on the outer side of the lower portion of the slide bar (25). The third guide roller (30) is a guide for the outer mast (5). It is designed to come into contact with the inner surface of the bar (10).

As shown in FIGS. 11 and 12, the slider (7) movably supported by the inner mast (6) is a pair of sliders (7) arranged on the inner side of the slide bar (25) of the inner mast (6). Slide plate (35) (35) and slide plate (35) (35)
Upper support plate (36) and lower support plate bridged to the upper and lower parts of the front
The skeleton is formed by (37).

A fourth guide roller (38), which comes into contact with the inner surface of the slide bar (25), is rotatably attached to the outer upper and lower portions of each slide plate (35). A fifth guide roller (39), which comes into contact with the bottom surface of the slide bar (25), is rotatably attached to the outer intermediate portion of (35) to prevent the slider (7) from rattling in the left-right direction. is there.

Also, the upper support plate (36) and the lower support plate (37)
As shown in FIGS. 13 and 14, an upper locking plate (40) and a lower locking plate (41) for supporting a fork (8) described later are attached to the slider (7).

This upper locking plate (40) is provided with a step portion (40a) which engages with an upper locking claw (51) of the fork (8) described later at the upper edge portion, and further, this upper edge portion Fork to be described later
A predetermined number of recesses (40b) with which the positioning pins (55) of (8) engage are formed.

The lower locking plate (41) is the lower support plate (37).
Slide base (42) and slide base (4
It is supported by 2) so that it can slide vertically, and
It consists of a locking plate (43) that is constantly pressed downward by a spring (44) interposed between the two. Protrude below the edge and attach a fork to the lower edge of the lower locking plate (41).
A step portion (41a) that engages with the lower engaging claw (52) of (8) is formed.

Further, the central portion of the upper edge of the lower locking plate (41) has one end of a lever (46) which is swingably supported above the lower locking plate (41) about a pin (45) as a rotation center. When the other end of the lever (46) is pushed down, the locking plate (43) slides upward against the elastic force of the spring (44).

At the time of assembling the lifting device (2) consisting of the above-mentioned members, as shown in FIGS. 15 and 16, the inner mast (6) is slidably inserted into the outer mast (5) to form the outer mast (5). The return hydraulic cylinder (19) is interposed between the inner mast (6), and both ends of the chain (29) (29) bridged to each chain sprocket (28) (28) of the inner mast (6) are connected to the outer mast (5). For example, the slider (7) is slidably inserted into the inner mast (6) while being fixed to the second column (12), and one of the upper and lower support plates (36) (37) of the slider (7) is Connect to the chain (29) (29).

Also, the outer mast (5) and the inner mast (6)
The return type hydraulic cylinder (19) to be interposed has a long stroke, and this return type hydraulic cylinder (19)
The bottom surface of the main body of the outer mast is fixed to the lower cylinder support plate (18) of the outer mast (5), and the upper end of the main body is fixed to the outer mast.
It is fixed to the upper cylinder support plate (17) of (5) via the bracket (L) having a U shape, and the upper end of the rod is fixed to the inner mast (6).
The inner mast (6) is fixed to the fifth strut (26) of the
The lower end of the outer mast projects downward from the lower end of the outer mast (5) so that the fork (8) supported by the inner mast (6) via the slider (7) can come into contact with the ground.

The fork (8), which is supported by the slider (7) of the lifting device (A) as a set of two, is shown in FIG.
As shown in FIG. 20, a supporting member (50) having upper and lower engaging claws (51) (52) engaging with the upper and lower engaging plates (40) (41), and a lower portion of the supporting member (50). By the fixed bracket (53) (53),
The fork member (54) is supported below the support member (50).

In the upper locking claw (51), as shown in FIG. 20, the upper locking plate (40) fixed to the upper supporting plate (36) of the slider (7) is equidistantly spaced from the upper edge thereof. The positioning pin (55) that fits into the recess (40b) formed on the
Further, the positioning pin (55) is constantly pressed downward by the elastic force of the spring (56), and when engaged with the recess (40b), the positioning pin (55) is once elastically pressed by the spring (56). Pulling upwards, pull the positioning pin (55)
After being positioned above b), the positioning pin (55) is fitted into the recess (40b) by the elastic force of the spring (56).

The fork member (54) has a strip-shaped top plate (57) and a channel member (58) having a U-shaped cross section for reinforcing the top plate fixed to the lower surface of the top plate (57). ) And the rear part of the bracket (53) (5
By being pivotally attached to 3), it is rotatably supported at the bottom of the brackets (53) (53).

In addition, at any one of the front and rear equidistant positions of the pin (59) of the fork member (54), there is a through hole (60) provided in a portion of the bracket (53) located rearward of the pin (59). First and second through holes (61) and (62), one of which is the same, are formed.

Then, when the first through hole (61) on the fork side is aligned with the through hole (60) on the bracket side and the fixing pin (63) is inserted between them, the fork member (8) of the fork (8) is Five
As shown in FIG. 17, 4) is positioned and fixed with the tip of the fork member (54) facing forward, and the second through hole (62) on the fork side is aligned with the through hole (60) on the bracket side. The fixing pin (63) between them,
As shown in FIG. 18, the fork member (54) of (8) is positioned and fixed with the tip of the fork member (54) facing rearward.

A slider of the fork (8) having the above structure
When attaching to (7), push down the lever (46) of the slider (7) downward and pull up the locking plate (43) of the lower locking plate (41) upward, Engage the locking claws (51) with the upper locking plate (40) and the lower locking claws (52) with the lower locking plate (41).
After arranging it on the outer periphery of the lower locking plate (41), the locking plate (43) of the lower locking plate (41) is slid downward by the elastic force of the spring (44) to lower the lower locking plate (41) to the lower locking claw (52). The fork (8) is fixed to the slider (7) by fitting into the slider.

Further, at this time, the support member (53) of the fork (8)
Of the fork (8) by engaging the positioning pin (55) incorporated in the upper locking claw (51) of the fork with any of the recesses (40b) provided on the upper edge of the upper locking plate (40). It also positions in the horizontal direction.

When the lifting device (A) having the fork (8) attached thereto is mounted on the front surface of the tractor (B) as shown in FIG. 1, and the tractor (B) is used as a forklift, The fork member (54) of the fork (8) is positioned and fixed by using the fixing pin (63) with its tip facing forward as shown in FIG.
Use (8) to load and unload luggage.

In this case, the hitch (1) is attached to the brackets (2) and (3) fixed to the tractor (B), and the hitch (1) and the upper bracket (15) of the lifting device (A) are attached. The lifting device (A) may be supported in front of the tractor (B) by engaging with the lower bracket (16).

When the lifting device (A) is removed from the self-propelled vehicle and the lifting device (A) is supported alone in the upright state, as shown in FIG. 2, the fork member of the fork (8) is used. (Five
4), using the fixing pin (63) as shown in FIG.
The fork member (54) is positioned and fixed with its tip facing rearward, and the fork member (54) is brought into contact with the ground by lowering the slider (7).
Is used as a stand to support the lifting device (A) in an upright position.

Further, when the lifting device (A) is mounted on a self-propelled vehicle and the vehicle is not carrying luggage, the tip of the fork member (54) of the fork (8) is If it is directed upward, it is possible to reliably prevent accidents in which the fork member (54) accidentally comes into contact with other members while the vehicle is traveling.

In this case, the fork member (54) is fixed to the support member (53) by using, for example, a rope or the like to prevent the fork member (54) from rotating accidentally. .

[0043]

As described above, according to the present invention, a fork, which is detachably supported by a self-propelled vehicle and is attached to an elevating device for using the vehicle as a fork riff when a supporting member is used as a supporting member. Since the fork member is configured to be rotatable with respect to the support member, the fork member is supported so that its tip faces forward when the elevating device is used as a forklift, and When supporting the lifting device alone in an upright position, the fork member is supported so that its tip faces rearward, and this fork member can be used as a stand, so a stand for supporting the lifting device needs to be provided separately. Can be eliminated, and the number of parts of the lifting device detachably supported by the self-propelled vehicle can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a lifting device having a fork according to the present invention is mounted on a tractor.

FIG. 2 is a side view when the lifting device having the fork according to the present invention is independently supported in an upright state.

FIG. 3 is a front view showing an outer mast of the lifting device.

FIG. 4 is a side view showing an outer mast of the lifting device.

FIG. 5 is a sectional view taken along the line EE of FIG.

FIG. 6 is a cross-sectional view taken along the line 3F-F of FIG.

FIG. 7 is a front view showing an inner mast of the lifting device.

FIG. 8 is a side view showing an inner mast of the lifting device.

FIG. 9 is a plan view showing an inner mast of the lifting device.

FIG. 10 is a sectional view taken along the line G-G in FIG.

FIG. 11 is a front view showing a slider.

FIG. 12 is a side view showing a slider.

FIG. 13 is a side view showing a state where the upper and lower locking plates are attached to the slider.

FIG. 14 is a front view of the upper and lower locking plates.

FIG. 15 is a front view of the lifting device.

FIG. 16 is a partial cross-sectional side view showing the main parts of the lifting device.

FIG. 17 is a side view of the fork with the fork member facing forward.

FIG. 18 is a side view of the fork with the fork member facing rearward.

FIG. 19 is a front view of the fork.

FIG. 20 is an enlarged view of a main part showing a positioning pin incorporated in a fork.

[Explanation of symbols]

 A Lifting device 5 Outer mast 6 Inner mast 7 Slider 8 Fork 19 Returning hydraulic cylinder 50 Support member 53 Bracket 54 Fork member

Claims (1)

[Claims] 1. An outer mast, an inner mast that is liftably supported by the outer mast, a slider that is vertically liftable by the inner mast, and a return hydraulic cylinder that is interposed between the outer mast and the inner mast to lift and lower the inner mast. In order to use a self-propelled vehicle as a forklift, the fork attached to the slider of the lifting device that is detachably supported by the vehicle is provided with a support member attached to the slider and a bracket attached to the support member. A fork for an elevating device, which is rotatably supported and has a tip formed by a fork member facing either the front or the rear of the elevating device.