JPS5912100A - Cargo gear for cargo-handling car - 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 The present invention relates to a cargo handling device installed in the front part of a cargo handling vehicle, and more particularly to a cargo handling device for a forklift in which the state of attachment of a chain to a lift bracket that moves a mast up and down is improved.

2. Description of the Related Art Conventional cargo handling devices for cargo handling vehicles include those shown in FIGS. 1 to 4, for example. The carriage 1 has a fork 2 supported by upper and lower finger bars 3.4, and the upper and lower finger bars 3, 4 move the inner mast 5 to upper and lower carriage rollers 7a,
Lift bracket 7V that can be moved up and down by 7b
c It is formed by being fixed. A chain anchor bracket 8 is provided at the rear end of the lift bracket throat 7 of the carriage 1, and one end of a lift chain 9 for lifting the carriage 1 is attached to this bracket 8.
It is hung on a chain wheel 12 provided on the upper part of the inner mast 5 which is moved up and down by the arrow K, and the other end is attached to a bracket 13 extending from the outer mast 10.

In this cargo handling device, when the piston rod of the lift cylinder 11 is extended, the inner mast 5 slides on the outer mast 10 and is lifted upward, and the chain wheel 12 provided on the inner mast 5 is raised, so that the carriage is moved by the chain 9. 1 was lifted at a speed υ2 times faster than inner mast 5, and cargo handling work was being carried out.

However, in such conventional cargo handling equipment,
Since the chain 9 was attached to the rear end of the lift bracket 7, which is the edge of the carriage L on the vehicle body side, as shown in FIG. The horizontal distance to the center) becomes longer, and the load RUPR that acts on the upper and lower carriage roller roughs a and 7b of the lift bracket 7 increases.
j + RLWR4 becomes larger and both carriage rollers 7a! In addition, the durability of the chain anchor bracket 7b is reduced, and the gap between the chain anchor bracket 8 and the cross beam 5a of the inner mast 5 is narrow, so there is a risk that the chain 9, when loosened, may be caught in both members 7.5a.

Therefore, it is an object of the present invention to shorten the horizontal distance, reduce the load acting on the carriage roller, improve the durability of this roller, and to To provide a cargo handling device for a cargo handling vehicle that prevents a chain from getting caught by widening the gap between a bracket and a cross beam.

Next, this invention will be explained in detail with reference to the drawings.

The same reference numerals are used for parts or members that are the same or have the same height as in the prior art, and redundant explanation will be omitted.

5 to 12 are diagrams showing embodiments of the present invention.

First, the configuration will be explained. In the figure, reference numeral 1 denotes a carriage, and a predetermined portion K of the carriage 1 forward of the rear end of the lift bracket 7, which is the edge of the carriage 1 on the vehicle body side (in this embodiment, on a line connecting the centers of both carriage rollers 7a and 7b)
A chain attachment portion 2o is provided. As shown in FIG. 8, in this chain attachment part 2o, a chain anchor shaft 20a is fixed to the side surface of the lift bracket 7, and a chain anchor ring 20c is rotatably attached to the shaft 20a via a K bush 20b. A snap ring 20d for regulating the payout of the ring 20c is attached to a groove of the chain anchor ring 20a via a metal 20e between the ring 20c and the chain anchor ring 20c. The gap between the thread-like chain attachment part 2o and the cross beam 5a of the inner mast 5 is wider than the gap between the conventional chain anchor bracket 8 and the cross beam 5a. Chain anchoring 2 of this mounting part 20
One end of the chain 9 hung on the chain wheel 12 is attached to 0c, and the chain anchor ring 20c is rotatable in the same direction as the bending direction of the chain 9. Furthermore, this chain 9 is not vertical, but is inclined. The other end of the chain 9 is fixed to a bracket 13 extending from an outer mast 10 as in the conventional case. Note that the other end may be fixed to the lift cylinder 11 in some cases.

The operation of the cargo handling device having such a configuration will be explained.

When the piston rod of the lift cylinder 11 is extended by hydraulic pressure, the inner mast 5 is lifted, the chain 9 is pulled by the chain wheel 12 provided on this mast 5, and the upper and lower carriage rollers 7a + 7b of the lift bracket 7 lift the inner mast 5. The carriage 1 is raised by rolling. Load acting on carriage rollers 7a and 7b at this time R1JPR2+ R
LW112 is smaller than before.

That is, conventionally, as shown in FIG. 9, the load acting on the carriage rollers 7a and 7b is equal to the load on the carriage 1 and the cargo 14, Wl, which is applied horizontally from the position where this load W acts to the position where the chain 9 is attached. If the distance is L, the vertical distance from the mounting position of the chain 9 to the center of the upper carriage roller 7a is C1, and the vertical distance to the center of the lower carriage roller is C2, then RUpR+ "' Rr, wn+ = "RupR+ ``Rr, wn+ = ''RupR+0
It becomes 2.

On the other hand, the carriage roller 7a in the embodiment of the present invention
The loads RUPR2 and RLWR2 acting on +7b are:
As shown in FIGS. 9 to 11, when the carriage 1 is in equilibrium, the chain tension is F, and the horizontal component of this F (component of force caused by the inclination of the chain 9) is R1.
The angle formed between
Assuming that L1 and other symbols are the same as in the conventional example, -W- α4α 1-W- y ■α The load distribution of R to both gear ridge rollers 7a and 7b is -P base- Ten carrier nozzle roller 7a side RUPR -C1+C2. In the conventional example, since α=90°, R due to the tensile force from the chain 9 does not act.

Next, the load on both carriage rollers 7a and 7b due to the moment generated by one cargo 14 and the carriage 1 is RTl - upper key Y ridge roller 7a side knee lower carriage roller 7b side = 1 x W (
L-ΔL)C1+C2.

Therefore (upper carriage roller 7a side) RUP'R2=RO-RUPR-" (L-ΔLC,
)C++C2-α (lower carriage roller 7b side) Rr, wR2=Ro+R+, wR--W-1 (L-ΔL
+ physical) CI+C2 axis nα.

Comparing this with the conventional example, the upper carriage 1 cola 7a
The side is W C2= WL RUP12 C, +(2, (L-Δ”tmtX)〈
RUP'' CI+C2, and as −α becomes smaller (carriage 1 rises), the value of 1ttJPR2 becomes smaller.

On the other hand, in the case of lower carriage roller 7b side H1 ΔL > C+-, that is, -α, in other words, when the carriage 1 is low, such as when the lift height is frequently used (running state with the fork 300 mm UP), etc. (t-・〉■) Become a C clove ℃ woman.

1 Also, in the case of -α≦-, that is, when the work frequency is low and ΔL is close to the small maximum lifting height, the loads on both carriage rollers 7a and 7b are smaller than conventional ones within a range that suits the actual work situation.

In addition, if the mounting position of the chain ΔL engine 9 is determined so that -α≧5 at the maximum lifting height position, RLWR2>R1,w
It never becomes n+.

When these values are shown in a load characteristic diagram as shown in FIG. 11, the upper roller load characteristic line B and the lower roller load characteristic line C according to the present invention are better than the conventional roller load characteristic line A. It can be seen that the load is small. 1. The intersection of characteristic lines A and C is when -α=drunk.

On the other hand, when the pulling direction of the chain 9 changes according to the height of the carriage 1, the chain anchor ring 20c rotates the chain anchor shaft 20a in response to this changing pressure, and the chain 9 is pulled without bending. Uniform load acts on the entire surface, and durability does not deteriorate.

Also, when the carriage 1 reaches the lowest position, the chain 9
When the chain attachment part 20 becomes loose, as shown in FIG.
The chain anchor ring 20c rotates in the same direction as the bending direction of the chain 9 (counterclockwise). The chain attachment portion 20 is located at a predetermined portion in front of the rear end of the lift bracket 7, that is, from a distance r from the center of the chain attachment portion 20 to the outside of the chain 9 when the chain 9 is slack. Since the chain 9 is provided at a location where the distance t from the center to the cross beam 5a of the inner mast 5 is longer, the slack chain 9 is attached to the chain attachment portion 2.
0 and the cross beam 5a.

Furthermore, when attaching and detaching the chain anchor ring 20c to which the chain 9 is attached and the chain anchor shaft 20a, it is only necessary to attach and detach the snap ring 20d. be able to.

In this embodiment, the chain 9 is tilted to lift the carriage 1, but the direction of the pulling force may be vertical as long as the attachment position of the chain 9 is located in front of υ as in the conventional case.

As explained above, according to the present invention, it acts on the gear ridge roller. The load can be reduced compared to the conventional method, the durability of this roller can be improved, and the chain can be prevented from being caught in the cross beam of the inner mast.

[Brief explanation of the drawing]

・Figures 1 to 4 show the cargo handling equipment of conventional cargo handling vehicles.・
In the figure, Figure 1 is a plan view including a partial cross section of the cargo handling equipment;
Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is an enlarged perspective view showing the chain attachment state, and Fig. 4q is a side schematic explanatory view showing the cargo handling device in the cargo handling 1 operation a state. , Figures 5 to 12
The figure shows a cargo handling device according to an embodiment of the present invention.
Figure 5- is a plan view similar to Figure 1 showing the cargo handling equipment;
The figure is a sectional view taken along the line M-M in Figure 5, Figure 7 is an enlarged perspective view similar to Figure 3 showing the chain attachment state, and Figure 8 is an exploded perspective view showing the chain attachment part of the cargo handling device. 9 is a side schematic explanatory view similar to FIG. 4 showing the cargo handling state of the cargo handling device, and FIG. 1θ is a load component force explanatory diagram in the cargo handling state.
FIG. 11 is a load characteristic diagram of the carriage roller, and FIG. 12 is an enlarged side view showing the vicinity of the chain attachment portion. 1... Carriage, 5... Inner mast, 7...
Lift bracket, 9...Lift chain, 10...
・Outer mast, jl...lift cylinder, 12...
・Chain wheel, 20...Chain attachment part. Applicant: Nissan Motor Co., Ltd. Figure 1 Figure 2 Figure 4 Figure 5 Figure 6 Figure 8 Figure 9 Figure 10 Figure 11 300mm up MAXup Fork operating lift height

Claims (1)

[Claims] 1. A cargo handling device for a cargo handling vehicle, characterized in that a lift chain for raising and lowering a carriage is rotatably supported on the front side edge of the carriage so as to be rotatable in the same direction as the bending direction of the lift chain.