JPH10291790A - Raising and lowering part riding type fork lift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a pallet so that an operator may perform work by stepping onto a pallet to be supported by inserting forks. SOLUTION: Arms bent into chevron shape are respectively and syrmetrically arranged on the front surface of a bracket 6 with the laterally extending attitudes, the arms are so provided as to be freely oscillated by taking bent parts 10a as fulcrums, and pressing rods 15, 15 are projectingly provided on respective outer ends of the arms 10, 10 in parallel with forks 5. The pressing rods 15 are pressed down against extending force by tension springs 13, 13 by a drawing wire 12, the pallet is fixed in a fork inserting space by vertical repulsive press contact force formed by the forks 5 and the pressing rods 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift operation on a pallet supported by a fork.
It relates to a forklift that enables work at high altitudes.

[0002]

2. Description of the Related Art When unloading luggage from a high place or raising luggage to a high place, the worker himself gets on the elevating part and works on the elevating part raised to a desired height. To make this possible, a working lift device called an order picking truck is used. Such a work lift device is a dedicated type for getting on and off the elevator, and it is convenient for handling light and small luggage, but for handling heavy large luggage that can not be lifted alone, a separate forklift for cargo handling Is required. Since the cargo handling forklift has the same basic structure as the working lift device, it is possible to perform a work substantially the same as that of the working forklift by riding on the fork of the cargo handling forklift and performing the lifting operation. It is. Therefore, in a conventional loading forklift, there is an attempt to use the loading forklift as a working forklift device by attaching an attachment or incorporating a security member or the like.

As the attachment, as shown in FIG. 10, a sheath 2 for fork insertion is provided at the lower end.
A bucket 28 with a remote control operation unit having 7, 27 is used. The fork 5 is inserted into the sheath 27, and the bucket 28 is integrally attached to the fork 5, so that the same function as a working forklift can be provided. Although it can be used, when it is used for cargo handling, a storage space for the detached attachment is required, and there is inconvenience in handling such that it is troublesome to mount each time it is used for work. In that respect, if it is possible to perform a lift operation while riding on a pallet supported by a fork, while securing the pallet firmly and securing a work space surrounded by a protective frame on the pallet, Since it can be used as a lift, it is extremely efficient, and such a common type is actually being developed.

[0004]

In a common type in which the pallet is used as a boarding platform, a clamp type or a fastening type is adopted as a pallet fixing mechanism. As shown in FIG.
Since the pair of left and right holding claws 29 provided therebetween is opened and closed to sandwich the reinforcing plate m provided at the center of the pallet M, if the fork insertion position is slightly deviated left and right, the reinforcing plate m hits the holding claws 29 and hinders the fork insertion operation.
Is out of the space between the holding claws 29, the holding claws 2
9, the fork 5 is difficult to position. In the fastening type, as shown in FIG. 12, the drawer bracket 30 is rotated so as to protrude to a position above the pallet M, and the press-contact body 31 is fed out from the drawer bracket 30 by screw feed. And the upper plate of the pallet M is sandwiched between
The operation of pulling out the bracket and extending the press-contact body is troublesome, and the bracket 30 protruding on the pallet is required.
A fixing member such as the pressure contact body 31 or the like interferes with the work.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a forklift riding type forklift capable of eliminating a precise positioning and a troublesome fixing operation, and enabling a lift operation by riding on a pallet supported by a fork insertion operation. Therefore, the configuration is such that, at the base end side of the fork, a pressing body that is pressed down from the retracted position at substantially the same height as the fork against the inner bottom surface of the pallet into which the fork is inserted is provided, and within the fork insertion portion, A pallet can be fixed by a vertical repulsive contact force between the fork and the pressing body. The elevating-portion-type forklift is provided with a lift operation unit at a backrest position provided at a base end of the fork, a pressing body is disposed so that a pair of right and left is symmetrical with each other, and a pressing body is provided around its periphery. A pressing rod that presses the surface against the pallet,
Apply anti-slip treatment to the peripheral surface of the pressing rod,
The pressing body may be a swinging claw that allows the tip of the tongue to bite into the pallet, or a pressing body storage unit may be provided on the side of the fork, at least the tip side and the top side of the fork are guarded by a protective cover. Further, it is preferable that the pressing body is operated by a wire pulling operation, and that the wire and a spring are connected in series to absorb an excessive tensile force of the wire.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a forklift according to the present invention will be described with reference to the drawings. FIG. 1 shows an example in which the present invention is applied to a reach-type forklift serving as a cargo handling lift, and reference numerals 1 and 1 denote legs protruding forward from both lower sides of a machine base 2. , A carriage 3 is movably mounted in the front-rear direction, and columns 4, 4 are respectively suspended from both sides of the carriage 3. On the pillars 4,4, straddling the pillars 4,4,
Forks 5 and 5 composed of a pair of left and right narrow plates are assembled so as to be able to move up and down along the columns 4 and 4 via a bracket 6 attached to a base end thereof. A driver's seat is secured in the machine base 2, and the driver's seat is
An operation unit for raising and lowering and running operation is set, and can be used as a cargo handling lift by getting into a driver's seat.

[0007] The fork 5 has a backrest 7 suspended from a base end thereof, and a lift operating portion 8 for performing a lifting operation is incorporated at the position of the backrest 7 so that the fork 5 is mounted on the fork. Lifting operation is possible. Bracket 6 connecting base ends of forks 5 and 5
Is provided with a fixing mechanism 9 for inserting the forks 5 and 5 to fix the pallet lifted and supported. As illustrated in FIG. 2, the fixing mechanism 9 maintains a bilaterally symmetric relationship between a posture in which the arms 10, 10 bent in a U-shape are horizontally expanded and a posture in which the arms 10 are vertically extended. The arm 10 is pivotally provided with the bent portion 10a as a fulcrum.
The arm is connected to the lifting wire 12 via the link 11, and the arms 10, 10 are urged toward the expanding side by the tension springs 13, 13, and the excessive tensile force is absorbed between the link 11 and the lifting wire 12. Coil spring 1
4 are interposed. As shown in FIG. 3, the coil spring 14 for absorbing the excessive tensile force has links 1 on both sides.
Pull rod 14b coaxially arranged with cylindrical holder 14a connected to pull-up wires 12
Into the coil spring 14 and pull rod 14
b is engaged with a washer 14d supported by a nut 14c screwed to the tip of the b, and is retracted and accommodated in the holder 14a with a margin for shrinking. With such a configuration, the two arms 10, 10 are connected to the tension spring 1 when no tension acts on the lifting wire 12.
3, 13, and the wire 12
When a tensile force is applied to both sides, the outer ends are closed toward the lower center. In the closing operation, when an excessive tensile force acts on the pulling wire 12 due to a load on the arm or the like, the coil spring 14 is compressed in the holder 14a, the pull rod 14b follows the pulling wire 12, and the pulling wire 12 Excessive tensile force is absorbed. The arms 10, 1
0 at each outer end, a pressing rod 1 as a pressing body
5, 15 are protruded forward in parallel with the fork 5,
The pressing rods 15, 15 are attached to the arms 10,
When both sides of the fork 5 are expanded, the forks 5 and 5 are pulled up to a retracted position in close contact with the side portions thereof. A protective cover 1 is provided on each inner surface of the forks 5, 5 to guard the front and upper sides of the pressing rods 15, 15 at the retracted position.
Push rod storage sections 16 and 16 surrounded by 6a are provided. The pressing rod 15 is covered with a rubber tube 15a so that the peripheral surface of the pressing rod 15 is non-slip. Further, the pulling wire 12 is connected to a lever 17 provided on the backrest 7, and pulls up the wire 12 by operating the lever so that the wire 12 can be locked at the wire pulling position.

[0008] As shown in FIG.
The backrest 7 is formed so as to overlap with the outside of the backrest 7 along both side edges and the upper edge thereof, and between the overlapped storage position and the set position which projects substantially horizontally to the tip end side of the fork 5, A protection frame 18 that is rotatable about the side edge of the backrest 7 is provided. The protective frame 18 is formed by bending a pipe, the interval between both side edges is slightly wider than the entire width of the backrest 7, and the proximal ends of the side edges are inwardly directed to pins 19, 19, respectively. Is protruding. On the other hand, in the backrest 7, slits 20, 20 are formed at both side edges from a lower end to a substantially intermediate portion. The protection frame 18 is provided with the pins 19 projecting from the base end along the slits 20. It is assembled with a stop ring 19a so as to be slidable vertically. Further, a portion further above the upper end of the slit 20 on both sides of the backrest 7 and the protective frame 1
8 are connected to stays 21 and 21 whose ends are rotatably connected to the substantially central portion of the side edge portion.

At the upper end of the slit 20, a hook-shaped engaging portion 20a is cut rearward to form a protective frame 1.
When the pin 8 is rotated to a set position where the pin 8 is substantially horizontal, the pin 19 enters the locking portion and is locked, and the protection frame 18 is in a horizontal posture beside the locking portion 20a. When in the locked position, the retaining ring 1 attached to the pin 19 protruding from the base end of the protective frame 18.
A limit switch 22 that is turned ON upon contact with 9a is provided so that it can be checked whether the protection frame 18 has been set securely (see FIG. 5). Further, rubber hooks 23, 23 having concave portions matching the peripheral surface shape of the protective frame are provided on the upper edge of the backrest 7.

[0010] The forklift thus formed is
When used for work, a fork is first inserted into a pallet and secured by a fixing mechanism to secure a boarding platform. In this fixing operation, with the lever released, a fork is inserted into the pallet, the lever is turned, the wire is pulled up, and the pressing rod is pushed down. The pallet M is fixed in the space S for fork insertion by a repulsive pressure contact force in the vertical direction by the fork 5 and the pressing rod 15 by the pressed rod pressed down against the inner surface of the bottom plate portion (see FIG. 6). ). By fixing the pallet M, a scaffolding on which the operator can get on and work on the pallet M is secured. Next, when the protection frame 18 is rotated toward the tip end side of the fork 5, the pins on both sides enter the locking portions at the upper ends of the slits at the substantially horizontal set position and are locked, and the protection frame is placed on the pallet. When the movement range surrounded by is set, and at the same time the limit switch is operated and the completion of the setting is confirmed, the operation lever of the lift operation unit 8 becomes effective. The operation lever is interlocked with a controller mounted on the machine base, and operates an actuator via a hydraulic unit to perform an up / down operation. The worker can move freely within a range surrounded by the protection frame.

When used for cargo handling, the pin 19 is moved from the locking portion 20a to the slit 20 side to release the lock, and the protection frame 18 is lifted and rotated to the backrest 7 side. Are connected to both side edges of the backrest 7 by stays 21, respectively, so that the position of the pin serving as a pivot point moves downward as the protective frame 18 rotates, as shown in FIG. 7. Protective frame 18 is backrest 7
The upper edge is held by the hook 23 when it is overlapped so as to be in close contact with the outer edge of the. These hooks 23 are provided directly in front of the columns 4 and 4, and when used for cargo handling, the front view is not obstructed in the driver's seat. In this way, by storing the protective frame so that it overlaps the backrest, it does not protrude above the backrest,
Also, it does not fall forward. After storing the protective frame,
The lever 17 is turned to the release side to release the fixing mechanism. In the released fixing mechanism, the pressing rod is stored in the pressing rod storage portion and does not hinder the cargo handling operation, and the pressing rod is guarded by the protective cover.

In the fixing mechanism of this embodiment, when not in use or when inserting the fork into the pallet, the pressing rod in the retracted position is stored in the cover and integrated with the fork, so that it becomes an obstacle for inserting the fork. Since the pressing body is a pressing rod arranged in parallel with the fork, a long pressure contact surface can be secured in the front-rear direction, and the pallet does not shift due to the non-slip processing. However, the fixing function is such that the pressing rod moves down near the inner edge of the fork, so that even if the pallet is not accurately positioned, it does not interfere with the reinforcing plate of the pallet and the fork is even inserted. It is effective if there is no protrusion on the pallet in a fixed state, so that it does not hinder work or loading.

The fixing mechanism is, as exemplified in FIG.
Covering the arm 10 with a protect cover 24,
Fin-shaped biting wings 15b, 1
5b... If the arm 10 is covered with the protect cover 24, the trouble that the load contacts the fixing mechanism can be eliminated, and the picked load can be pressed against the protect surface of the protector cover.
Can be easily aligned. The pressing body of the fixing mechanism is
As illustrated in FIG. 9, the connecting portion between the link 11 and the wire 12 is pressed down by the tension spring 25 to urge the arm 10 in the expanding direction or to rotate vertically with the side edge portion of the fork 5 as a fulcrum. It is constituted by the swinging pawl 26 that is operated, and the toe 26a is made to bite into the pallet, so that slippage can be surely prevented.

The fixing mechanism is operated not only through the wire by turning the lever but also through a wire, but not shown. For example, the pressing rod is moved up and down by screw feed, or a pedal type is used. The operation method can use a well-known structure, and the actuator is driven by the signal of the limit switch for confirming the setting of the protection frame, or the protection frame and the pressing body are connected by a link, and linked with the rotation operation of the protection frame. It can also be done.

In the present invention, the form of the pressing rod may be appropriately changed within a range where the object of the present invention is achieved, the form of the protective frame is not limited to the embodiment, and only the reach type forklift is used. Also, the present invention is applied to a counter-type forklift or a walkie-type forklift having no driver's seat. If the lift operation unit is incorporated in the backrest, the operator who gets on the pallet can work while performing the lift operation, but if the lift operation unit is not provided on the backrest, the auxiliary operator The operator may operate the lift from the driver's seat or use a remote controller to enable the operator to operate the lift from the pallet.

[0016]

According to the present invention, the pallet is fixed from the inside of the pallet by the repulsive pressing force of the fork and the pressing body, so that the member does not appear on the surface of the pallet and the foot is obstructed during the operation. There is no. And if the lift operation part is provided at the backrest position, the worker who got on the pallet can perform the lift operation by himself, and if the pressing body is arranged so that the pair of left and right is symmetrical, it can be fixed in good balance and stable Excellent in nature. By using the pressing body as a pressing rod, the pressure contact surface can be increased in the front-rear direction, and the fixing function is strengthened by performing a non-slip treatment on the peripheral surface of the pressing rod. Also, if the pressing body is a swinging claw,
The toes do not slip into the pallet plate. Further, by providing the pressing body storage portion on the side surface of the fork, when the fork is inserted into the pallet, the pressing body is guarded by the protective cover, and if the excessive tension of the wire can be absorbed, for example, due to an error in the operation stroke, If the wire is pulled too much, no excessive force acts on the pallet.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an entire climbing-and-falling section forklift according to the present invention.

FIG. 2 is an explanatory diagram of a fixing mechanism.

FIG. 3 is an exploded explanatory view showing a mounted state of a coil spring for absorbing an excessive tensile force.

FIG. 4 is an explanatory view showing a state where a protective frame is assembled to a backrest.

FIG. 5 is an explanatory view showing an upper end portion of a slit.

FIG. 6 is an operation explanatory view of a fixing mechanism.

FIG. 7 is an explanatory diagram showing a storage operation of a protection frame.

FIG. 8 is an explanatory view showing a modified example of the fixing mechanism.

FIG. 9 is an explanatory view showing a modified example of the fixing mechanism.

FIG. 10 is an explanatory diagram of a conventional example.

FIG. 11 is an explanatory diagram of a conventional example.

FIG. 12 is an explanatory diagram of a conventional example.

[Explanation of symbols]

1, leg, 2 machine stand, 3 carriage, 4 ...
Prop, 5 fork, 6 bracket, 7 backrest, 8 lift operating section, 9 fixing mechanism, 10
..Arm, 10a..Bent portion, 11..Link, 1
2 ・ ・ Pull up wire 、 13 ・ ・ Tension spring 、 14 ・
・ Coil spring, 14a ・ ・ Holder, 14b ・ ・ Pull rod, 14c ・ ・ Nut, 14d ・ ・ Washer, 15 ・
· Push rod, 15a · · tube, 15b · · · biting wing, 16 · · · rod storage section, 16a · · protection cover, 17 · · lever, 18 · · protection frame, 19 · · pin,
19a: Stop ring, 20: slit, 21: stay, 22: limit switch, 23: hook, 2
4. Protect cover, 25. Tension spring, 26
..Oscillating claws, 26a, toes, 27., sheaths, 28 ..
Bucket, 29 ... Nail, 30 ... Drawer bracket, 31 ... Press body, M ... Pallet, m ... Reinforcement plate,
Space for inserting a fork.

Claims (8)

[Claims] 1. A forklift capable of performing a lift operation while riding on a pallet supported by insertion of a fork, wherein a fork is provided at a base end side of the fork from a retracted position having substantially the same height as the fork. A lifting forklift that is provided with a pressing body that is pressed down against the inner bottom surface of the inserted pallet and that can fix the pallet in the fork insertion portion by a vertical repulsive contact force between the fork and the pressing body. . 2. The forklift according to claim 1, wherein a lift operating section is provided at a backrest position provided at a base end of the fork. 3. The forklift of claim 1 or 2, wherein the pressing body is arranged so that a pair of right and left sides is symmetrical to each other. 4. The lift forklift according to claim 1, wherein the pressing body is a pressing rod for pressing a peripheral surface of the pressing body against a pallet. 5. The forklift according to claim 4, wherein a non-slip treatment is applied to a peripheral surface of the pressing rod. 6. The forklift according to claim 4, wherein the pressing body is a swinging claw for making a toe bite into a pallet. 7. The lifting unit according to any one of claims 1 to 6, wherein a press body storage unit is provided at a side portion of the fork, at least a tip side and an upper surface side of the fork are guarded by a protective cover. Type forklift. 8. A lift type riding forklift in which the pressing body is operated by a pulling operation of a wire, and the wire and a spring are connected in series to absorb an excessive pulling force of the wire.