JPH06321498A - Fork structure of fork-lift truck - Google Patents

Abstract

PURPOSE:To facilitate a job for unloading by making a roller or ball so as to be floatable and vice versa from the top face of a fork without installing a driving device. CONSTITUTION:A fork structure of a fork-lift truck is featured that a holder 28 attached with a roller or ball in a fork 20 is installed shiftably up and down, and a roller or ball 30 peeps from a top face of the fork 20 by dint of an upward motion by pressing force against a lower object of the holder 28 while this roller or ball 30 is made so as to be hidden from the top face of the fork 20 by dint of a downward motion by separation from the lower object of the holder 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fork structure of a forklift, which is convenient for use when, for example, in a high-rise building under construction or after construction, when carrying a load lifted by an elevator installed outdoors, into a room. It is a thing.

[0002]

2. Description of the Related Art A fork of a forklift has a flat upper surface, and is heavy when an object is placed on the fork and slid. For this reason, there is a device in which a roller or a ball is attached so that it can be seen through from the upper surface of the fork. However, if this is done, although it is light when sliding, it is dangerous because it rolls when moving. Therefore, the actual Kaihei 4-7089
Japanese Patent Laid-Open No. 4 (1994) proposes a roller that can be lifted and lowered from the upper surface of a fork.

[0003]

However, in the above-mentioned prior art, since the drive device is used to float and set the rollers, a forklift which is generally used because it requires a space for accommodating the drive device. Can not be installed on the fork. In addition, the device becomes complicated and the price becomes high. The present invention solves such a problem and, in short, makes it possible to float or sink a roller or a ball without using a drive device or the like.

[0004]

SUMMARY OF THE INVENTION Under the above problems, the present invention provides a fork structure of a forklift in which a holder having a roller or a ball mounted in the fork is movable up and down, and the holder is pressed against an object below. The fork structure of the forklift is characterized in that the roller or the ball is seen through from the upper surface of the fork by the upward movement of the fork, and the roller or the ball is hidden from the upper surface of the fork by the downward movement due to the separation from the lower object of the holder. Is.

[0005]

With the above-mentioned means, the roller or ball is relatively floated up and can be seen from the upper surface of the fork only by lowering the fork and pressing the holder against the lower object. Therefore, if the load is slid and placed on the roller or the ball in this state, it is light. On the other hand, when the fork is lifted and separated from the lower object, the roller or the ball is hidden from the upper surface of the fork, so that the load on the roller or the ball is received by the upper surface of the fork which is hard to slip.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 3 is a side view of the forklift according to the present invention, and FIG. 4 is a front view of the forklift. In the forklift, the column 14 is erected at the rear of the frame 12 to which the wheels 10 are attached, and the fork mount 16 is attached to the column 14. A hydraulic cylinder 18 etc. is attached so that it can be moved up and down, and a fork mounting body 16
Two forks 20 are attached to the. The forklift is maneuvered by the handle 22 provided at the rear part of the pillar 14, and the fork 20 is moved up and down, that is, the hydraulic cylinder 1.
The expansion and contraction of 8 is the lifting pedal 24 provided at the rear of the column 14.
Alternatively, the knob 26 is used.

1 is a partial sectional side view of the fork, and FIG. 2 is a partial sectional plan view. In the fork 20, a holder 28 having a shape in which two plates are opposed to each other is provided so as to be vertically movable, and A plurality of rollers 30 are attached to the holder 28 at predetermined intervals. When the holder 28 moves downward, the roller 30 is hidden from the upper surface of the fork 20, and when the holder 28 moves upward, the roller 30 can be seen from the upper surface. Therefore, a window 32 is provided on the upper surface of the fork 20 so that the roller 30 can be seen, and the roller 30 is provided under the window 32.

As a structure for moving the holder 28 up and down,
It is conceivable that the shaft 34 of the roller 30 at the rearmost part is passed through to the side surface of the fork 20 so as to be rotatable about this shaft 34. Since the vertical movement of the holder 28 needs to be restricted within a certain range, the pin 36 is provided on the side surface of the holder 28.
The upper and lower elongated holes 3 formed on the side surface of the fork 20
Pass through 8. As a result, the pin 36 becomes the long hole 38.
The limit of downward movement is when it hits the bottom edge of
The roller 30 is hidden from the upper surface of the fork 20, and the limit of the upward movement is when it hits the upper end. At this time, the roller 30 is seen from the upper surface of the fork 20.

FIG. 5 is an explanatory view of loading a load into the room by using the elevator 40 for lifting and lowering the luggage installed outside the building. A roller conveyor 42 for moving the luggage is provided on the floor of the elevator 40. It is spread and the luggage 44 is placed on this and lifted. When the elevator 40 comes to a predetermined floor, the elevator 40 stops, but at this time, since there is a portion called the platform 48 between the elevator 40 and the waist wall 46 of the room, the roller conveyor 50 is also laid on this portion to lift the elevator. The roller conveyors 42 and 50 connect between 40 and the waist wall 46.

By the way, the roller conveyors 42, 50 may be connected separately by hooking the hooks 52 as shown in the drawing, or by a pin (not shown) in advance.
For example, it may be connected by means such as a fold, and can be folded when not in use (when it goes out of the elevator 40 when going up and down, it should be bent upward so as not to get in the way). Besides, stoppers 54 that can be stored are provided at both ends of the roller conveyors 42 and 50 to prevent the luggage 44 from being displaced, and a similar stopper 56 is provided at the front end of the fork 20 or the holder 28. It is provided.

When the elevator 40 and the waist wall 46 are connected by the roller conveyors 42 and 50, the forklift in the room is moved to the end of the roller conveyor 50 to carry in the cargo 44. 6 to 11 are explanatory views showing this state, first, the fork 20 is raised above the waist wall 46 and lowered onto the platform 48 (FIG. 6). When the fork 20 lands on the platform 48, the holder 28 rises relatively and the roller 30 looks into the upper surface of the fork 20 (FIG. 7). In order to ensure this, a protruding portion 58 is formed downward at the front end of the holder 28 (a roller 60 may be provided at the tip of the protruding portion 58).

Next, the stock bar 54 of each roller conveyor 42, 50 is released (at this time, the stopper 56 of the fork 20 is retracted), and the load 44 is slid from the roller conveyor 42, 50 to the roller 30 of the fork 20. (FIG. 8) When the luggage 44 has been transferred to the roller 30 of the fork 20, the stubber 56 of the fork 20 is lifted and locked (FIG. 9). When the fork 20 is raised after this state, the holder 28 is relatively lowered, the roller 30 is hidden from the upper surface of the fork 20, and the load 44 is supported on the upper surface of the fork 20 (FIG. 10). Finally,
When the forklift is retracted and the luggage 44 is lowered onto the floor, the loading is completed (FIG. 11).

FIG. 12 shows another embodiment of the structure in which the roller 30 is lifted and lowered. In this embodiment, an inverted L-shaped notch 62 is provided at the front end of the holder 28, and the notch 62 is provided on the platform 48. It is designed to be applied to the corner of. That is, the holder 28 can be freely moved up and down by being guided in the fork 20 by the front and rear two pins 36 and the long hole 38 formed in the fork 20.
At this time, the long hole 38 is formed in the horizontal portion 38a and the descending portion 38b continuous to the front end thereof.

As a result, when the notch 62 is pressed against the corner of the platform 48, the pin 36 rises from the obliquely descending portion 38b of the elongated hole 38 to the horizontal portion 38a, and the roller 30 looks into the upper surface of the fork 20. The pin 36 (holder 28) is always provided with a known means so that the slanting portion 38 of the elongated hole 38 is always
When biased by b, the roller 30 automatically hides from the upper surface of the fork 20 only by releasing the pressing force. If a cushioning material 64 such as rubber is provided at the cut 62, a proper cushion is provided and no damage is caused.

FIG. 13 also shows another embodiment of the structure in which the roller 30 is lifted and lowered. In this embodiment, vertically movable cams 66 are attached to the front and rear ends of the holder 28, and the cam 66 is used as a handle 68. Roller 3 by rotating with
It is designed so that 0 floats and sinks. The vertical position of the cam 66 is fixed by a known means. In both of the above examples, there is an advantage that the heights of the rollers 30 are uniform and rise and fall.

While the above is the basic form of the present invention, the above rollers 30 can be replaced by balls. The ball can be used to move the luggage 44 in either direction. Further, a pivot fulcrum 70 is provided on the rear portion of the fork 20 with respect to the fork mounting body 16 so that the fork 20 can pivot around the pivot fulcrum 70 (of course, it can be locked in a non-rotation state). The lock mechanism is provided by a known means) and does not take up space during storage.

[0017]

As described above, the present invention is as described above, that is, the roller or the ball can be floated / sunk from the upper surface of the fork only by pressing the holder attached with the roller or the ball against the lower object or the like. Therefore, it is not necessary to provide a driving means for forcibly performing this, and a small space can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a fork showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view of a fork showing an embodiment of the present invention.

FIG. 3 is a side view of a forklift truck.

FIG. 4 is a front view of a forklift.

FIG. 5 is an explanatory diagram showing a state in which a load is carried into a higher floor by using an elevator and a forklift.

FIG. 6 is an explanatory diagram showing a procedure for carrying in luggage.

FIG. 7 is an explanatory diagram showing a procedure for carrying in luggage.

FIG. 8 is an explanatory diagram showing a procedure for carrying in luggage.

FIG. 9 is an explanatory diagram showing a procedure for carrying in luggage.

FIG. 10 is an explanatory diagram showing a procedure for carrying in luggage.

FIG. 11 is an explanatory diagram showing a procedure for carrying in luggage.

FIG. 12 is a side view of a fork showing another embodiment of the present invention.

FIG. 13 is a sectional side view of a fork showing another embodiment of the present invention.

[Explanation of symbols]

 20 fork 28 holder 30 roller or ball

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuo Yamazaki 428 Enami, Okayama City, Okayama Prefecture, Seirei Industry Co., Ltd. (72) Inventor Yukihiro Fukuda 428, Enami, Okayama City, Okayama Prefecture, Seirei Industry Co., Ltd. (72) Inventor Yuji Inoue 1-32 Chayamachi, Kita-ku, Osaka-shi, Osaka Yanma Diesel Co., Ltd.

Claims (1)

[Claims] 1. In a fork structure of a forklift, a holder in which a roller or a ball is mounted is provided in the fork so as to be vertically movable, and the roller or the ball is seen from the upper surface of the fork by the upward movement of the holder by pressing the lower object. A fork structure of a forklift, characterized in that the roller or the ball is hidden from the upper surface of the fork by the downward movement of the holder away from the lower object.