JPS63212697A - Reach type twin mast forklift - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a reach-type forklift, and more particularly to a forklift equipped with two sets of mast devices that can perform reach operations independently.

(Prior Art) Conventional forklifts are usually equipped with one set of mast devices.

Therefore, when items are placed on a plurality of pallets, the transfer and transportation work must be repeated for each pallet, resulting in poor work efficiency.

Therefore, as a means of improving work efficiency,
There is a forklift truck equipped with a pair of mast devices equipped with two upper and lower forks that each independently raise and lower (
For example, see Japanese Patent Application Laid-open No. 19698/1983).

(Problems to be Solved by the Invention) In the case of the above-mentioned two-stage fork system, two items can be carried in and out at the same time using the upper and lower forks, which improves work efficiency and improves the ability to handle bulky items. Since it can be transported while being sandwiched from above and below, it is effective in terms of increased safety.

By the way, in actual cargo handling work, situations often arise in which it is desired to take out only the lowest or middle cargo of cargo loaded in multiple tiers. In the case of a type-type forklift, as with conventional forklifts, it is impossible to take out the items from the bottom unless the items stacked on the upper level have been moved to another location, and efficiency is reduced in this respect. It was extremely bad.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a forklift truck that can easily take out any item in the middle or lower tier from among items stacked in multiple tiers.

(Means for Solving the Problems) The present invention for solving the above problems extends a pair of left and right outer rails and inner rails in parallel and horizontally toward the front of the vehicle body, and a fork is mounted on the outer rails to raise and lower the rails. The inner mast device is equipped with an outer mast device that can be moved up and down, and the inner mast device is equipped with a fork that can be raised and lowered on the inner rail so that it can move forward and backward individually, and this inner mast device can be handled by passing inside the outer mast device. The gist is what has been constructed.

(Function) Therefore, the outer mast device is advanced along the outer rail and the upper load is lifted by the fork, the inner mast device is advanced along the inner rail, the lower load is taken out by the fork, and then the inner mast device is By moving astern and then lowering the fork of the outer mast device,
You can take out the desired baggage.

(Example) Hereinafter, an example of the present invention will be specifically described based on the drawings. In the figure, 1 shows the body of a reach-type forklift, which is equipped with a pair of left and right reach legs 2 extending horizontally forward from both sides of the front end. An outer rail 3 and an inner rail 4 are arranged to extend parallel to each other and horizontally. The outer rail 3 has its web back surface fixed to the inner surface of the reach leg 2, and the inner rail 4 is attached to the outer rail 3.
It is disposed at a slightly higher position with a predetermined distance from the outer rail 3, and its tip end is connected to the tip end of the outer rail 3 via the tie plate 5. Note that the base end portion of the inner rail 40 is fixed to the vehicle body 1.

An outer mast device A is provided on the outer rail 3, and an inner mast group faB is provided on the inner rail 4 so as to be movable forward and backward. The outer mast group mA consists of a pair of left and right outer masts 6, an inner mast 7 that is raised and lowered along the outer masts 6, and a mast carriage 8 fixed to the lower end of the outer mast 6. The upper ends of the left and right seven outer masts 6 are crossed. The left and right inner masts 7 are connected to each other by a beam 6a, the upper ends and intermediate portions of the left and right inner masts 7 are connected to each other by a tie beam 7a, and the left and right mast carriages 8 are connected by a connecting plate 8a.

The inner mast 7 is moved up and down by left and right lift cylinders 9 erected on the connecting plate 8a, and the lift bracket 11 mooring and supporting the fork 10 is connected to the chain wheel 1 attached to the tie beam 7a of the inner mast 7.
The lift chain 13 attached to the inner door can be moved up and down along the inner door. Furthermore, the mast carriage 8 is movable back and forth on the outer rail 3 via a pair of front rollers 14 provided on its outer surface, and is also moved back and forth by a pair of left and right reach cylinders 15 disposed at the bottom of the vehicle body. It has become so. That is, the outer mast 6, the inner mast door, and the lift cylinder 9 pass between the outer rail 3 and the inner rail 4, and the connecting plate 8a of the mast carriage 8 passes below the inner rail 4.

On the other hand, the inner mast device B is basically the outer mast device 1 described above.
It has the same configuration as ilA, with left and right outer masts 16.
and a cross beam 16a1 that interconnects them, the left and right inner masts 17, and a tie beam 17 that interconnects them.
a1 Consists of a mast carriage 1B fixed to the lower end of the outer mast 16 and a connecting plate 18a that interconnects the mast carriage 1B, and when the fork 10 of the outer mast group FtA is in the raised state, it passes through the inside to the outer mast device and can be handled. The left and right mast spacing and height are set.

In addition, the inner mast 17 is moved up and down by a lift cylinder 19 erected at the center of the connecting plate 18a, and the lift bracket 21 supporting the fork 20 is moved up and down by the inner mast 17.
Chain wheel 22 attached to tie beam 17a of No. 7
The mast ridge 18 can be moved up and down by a lift chain 23 hung on the inner rail 4, and the mast ridge 18 can be moved forward and backward on the inner rail 4 via a pair of front and rear rollers 24 provided on the outer surface of the mast ridge 18. It is moved back and forth by a reach cylinder 25 located at the lower center. Further, the fork 20 of the inner mast device B is smaller than the fork 10 of the outer mast device A.

In this embodiment, a reach-type twin-mast forklift is constructed as described above, and therefore, among cargoes stacked in multiple tiers, it is possible to take out cargo from the lower tier.

This will be explained below regarding the case of upper and lower two stages shown in FIGS. 4 to 7.

First, in a standby state as shown in FIG. align it with the pallet P1 of the upper cargo W1 and lift it to a predetermined position (see Fig. 5).

In this state, by appropriately operating the reach cylinder 25 and lift cylinder 19 for the inner mast device, the inner mast device faB is advanced and the fork 2 is moved forward as shown in FIG.
0 into the pallet P1 of the lower cargo W2, and
After lifting this to a position slightly above the upper surface of the inner rail 4, the vehicle moves backward. Thereafter, as shown in Fig. 7, the fork 10 to the outer mast device is lowered to lower the upper load W1 to the ground, and the outer mast device gtA is moved astern to a predetermined position, whereupon the lower load W2 can be taken out. The work is completed.

Note that the forklift of this embodiment is not limited to the above-mentioned working mode; for example, when the inner mast assembly 2iB is on standby at the position closest to the vehicle body, only the outer mast assembly A is used and the operation is the same as before. In addition, when handling bulky cargo, the cargo is loaded onto the fork 20 of the inner mast device B, and then the cargo is held down from above by the fork 10 of the outer mast device mA. This allows the cargo to be transported in a stable state, and furthermore, it is also possible to carry in and take out a plurality of cargoes at the same time by using the outer mast device Δ and the inner mast device B together.

(Effects of the Invention) As detailed above, the present invention provides a reach-type twin-mast forklift equipped with an outer mast device and an inner mast device that can be handled by passing through the inside of the outer mast device. With the vehicle in the loading position, it is possible to easily take out any item from the middle or lower tier from among the stacked items, and it is also useful not only for such work but also for general work. This can be applied to operations such as loading and unloading multiple loads at the same time using both mast devices, or transporting bulky loads while being clamped from above and below, and is suitable for cargo handling operations using forklifts. This greatly helps improve efficiency and safety.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is a partially cutaway side view, FIG. 3 is a partially cutaway plan view, and FIGS. FIG. 7 is an explanatory diagram showing the working form when taking out luggage from the lower tier. 1... Vehicle body 2... Reach leg 3.
...Outer rail 4...Inner rail A...Outer mast device B...Inner mast device Applicant Toyoda Aircraft Manufacturing Co., Ltd. Representative Patent attorney Hidehiko Okada (3 others) 1... Vehicle body 2 ...Leave leg 3...Outer rail 4...Inner rail A...Outer mast equipment 2 B...Inner mast equipment Fig. 1 Fig. 3 Fig. 4 Fig. Δ Fig. 5

Claims (1)

[Claims] A pair of left and right outer rails and an inner rail extend parallel and horizontally toward the front of the vehicle, the outer rail has an outer mast device with a fork that can be raised and lowered, and the inner rail has an inner mast device with a fork that can be raised and lowered. A reach-type twin-mast forklift in which the mast devices are individually movable forward and backward, and the inner mast device is configured to be able to pass through the inside of the outer mast device.