JPS641353Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a mast device for an industrial vehicle.

Prior Art Conventionally, mast devices for industrial vehicles such as forklifts include an outer mast 3, a middle mast 7, and an inner mast 11, as shown in Japanese Utility Model Application Publication No. 55-120692 or as shown in Figs. 1, 2, and 3.
A pair of three-tiered masts 1, 1 consisting of a pair of lift cylinders 5, 5 that control the middle mast 7 supported by the outer mast 3 to move up and down; one end connected to the outer mast 3 and the other end connected to the inner mast 11. a carriage 17 supported by the inner mast 11 and controlled to be able to rise and fall freely via the chain wheel 21 and the full free chain 15; the full free cylinder 13 and the lift chain 17; It consists of full-free hydraulic hoses 33, 33 connected to the cylinder 5, and the hydraulic hoses 33, 33 of this mast device are arranged between the left and right three-stage masts 1, 1, as shown in FIG. The layout is such that the front side, that is, the carriage 17 side and side surfaces are exposed when the lift is high.

For this reason, during cargo handling work, if the cargo is collapsed, the cargo may collide with the hydraulic hose 33, and the hose 33 may be damaged in some cases. In particular, one of the left and right hydraulic hoses 33, 33 is designed for high pressure, and if it is damaged, a problem may occur that could lead to an accident. Also,
In order to secure forward visibility, the hydraulic hose obstructs the visibility, which is undesirable.

Purpose of the invention Therefore, this invention provides a mast device for an industrial vehicle that ensures forward visibility and prevents cargo from directly colliding with a hydraulic hose when it falls.

Structure of the invention In order to achieve the above-mentioned object, this invention provides a hose pulley and a chain wheel with their axes in the vehicle width direction in parallel near the rear of the inner mast, and connects the hydraulic hose to the hose pulley and the lift chain to the chain. By hanging the hydraulic hoses around each wheel and placing them on the outside of the lift chain, the front side of the full-free hydraulic hose is surrounded by the mast, and the inside is surrounded by the lift chain. .

Embodiment Hereinafter, an embodiment of this invention will be described in detail with reference to the drawings of FIGS. 4 to 6. Note that the same members as in the conventional example will be described with the same reference numerals.
In the figure, reference numerals 1 and 1 indicate a pair of left and right three-stage masts. A pair of left and right middle masts 7, 7 that are controlled to move up and down.
The inner mast 11 has a pair of left and right inner masts 11 which are controlled to be raised and lowered by lift chains 9, 9, and the inner masts 11 are controlled to be raised and lowered by a full free cylinder 13 and full free chains 15, 15. A carriage 17 is supported. In addition, the upper ends of each mast 3, 7, 11 are an outer atsupa cross beam 3a, a middle atsupa cross beam 7a, and an inner atsupa cross beam 11a.
are integrally connected by.

The full free cylinder 13 that controls the carriage 17 is supported by inner masts 11, 11, and the full free chains 15, 15 are wound around left and right wheels 21, 21 which are pivotally supported by the piston rod 19 of the cylinder 13. One end of the chain 15 is connected to the lift bracket 23 of the carriage 17, and the other end is connected to the full free cylinder 13. This allows the carriage 1
7 is adapted to move up and down along the inner mast 11 by the expansion and contraction of the piston rod 19.

On the other hand, the lift cylinder 5 is supported by the outer mast 3, and the piston rod 25 of the cylinder 5 is supported by the outer mast 3.
is connected to the middle mast 7. Thereby, the middle mast 7 is connected to the piston rod 25.
It is designed to move up and down along the outer mast 3 by expanding and contracting.

In addition, hose pulleys 27, 27 and chain wheels 29, 29, whose axes W, W are in the width direction of the vehicle, are arranged in parallel at the rear adjacent portions of the inner masts 11, 11, respectively. The chain wheel 29 is
The hose pulley 27 is arranged inside the rail portion 11b of the inner mast 11, and the hose pulley 27 is arranged outside. The hose pulley 27 is fixed to the middle mast 7 via a bracket 31, and full-free hydraulic hoses 33, 33 are wound around the pulley 27. One end of the hydraulic hose 33 that is wound around the pulley 27 communicates with the discharge side of the lift cylinder 5, and the other end communicates with the full-free cylinder 13.

Further, the chain wheel 29 is pivotally connected to a wheel shaft 29a fixed to the middle mast 7, and the lift chain 9 is wound around the wheel 29. One end of the lift chain 9, which is wound around the wheel 29, is connected to the outer mast 3, and the other end is connected to the inner mast 11, respectively.

In the mast device configured in this way,
By supplying hydraulic pressure to the full free cylinder 13, the carriage 17 comes to rise along the inner mast 11. When hydraulic pressure is supplied to the lift cylinder 5 when the carriage 17 is raised,
The middle mast 7 rises along the outer mast 3, and the inner mast 11 rises along the middle mast 7. Hydraulic hose 3 at this high head
3 and 33 are surrounded by the front inner mast 11, the side lift chain 9, and the upper bracket 31, so even if the cargo falls, the hydraulic hose 3
No more direct contact with 3. Further, since there are no hydraulic hoses 33, 33 between the left and right inner masts 11, forward visibility is improved.

In addition, the full free cylinder 13 of this embodiment
Although it is a piston type, it can also be a ram type.

Effects of the invention As explained above, according to the mast device of this invention, damage to the hydraulic hose is eliminated, and accidents such as breakage of the hydraulic hose can be prevented.
Moreover, forward visibility during cargo handling operations is improved.

[Brief explanation of the drawing]

Figure 1 is a schematic plan view showing the arrangement of a conventional mast device, Figure 2 is a partially cutaway rear view of the same as above, Figure 3 is a schematic explanatory diagram showing the connected state of the mast device, and Figure 4 is this FIG. 5 is a rear view similar to FIG. 2, and FIG. 6 is an exploded perspective view showing the mast device of the invention. Explanation of main drawing symbols, 1...Three-stage mast, 3
...Outer mast, 5...Lift cylinder, 7...
...Middle mast, 9...Lift chain, 11...
...Inner mast, 13...Full free cylinder,
17...Carriage, 27...Hose pulley, 2
9...Chain wheel.

Claims (1)

[Scope of utility model registration request] A pair of left and right outer masts supported by the vehicle body,
a pair of left and right middle masts that are controlled to be raised and lowered by lift cylinders supported by the masts;
a pair of left and right inner masts that can be raised and lowered along the masts and supported by a lift chain; a carriage that is supported by the inner masts and is controlled to be raised and lowered by a full-free cylinder; and the full-free cylinder and the lift cylinder. In a mast device having hydraulic hoses connected to each other, the hose pulley is rotatably attached to a bracket fixed to the middle mast so that the axis thereof faces in the vehicle width direction, and the upper surface and inner pulley surface are covered by the bracket. Also, the hose pulley is provided so as to be close to the back surface of the rail portion of the inner mast and the flange surface of the rail portion of the middle mast, and to be close to the inside of the hose pulley so that the chain wheel can be rotated to the middle mast and its axis is directed in the width direction of the vehicle. A mast device for an industrial vehicle, characterized in that the hydraulic hose is wound around a hose pulley, and the lift chain is wound around a chain wheel.