JPH10291792A - Materials handling vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a materials handling vehicle capable of sufficiently securing a loading space for loads while restraining the cost of pats from being increased. SOLUTION: In a materials handling vehicle provided with a mast 5 is provided with a pair of roller guides 4a, 4b provided on a vehicle body frame 1, a pair of roller brackets 6a, 6b provided with slide rollers 7a, 7b fixed to the mast 5 and capable of being moved along the roller guides 4a, 4b, chains 11a, 11b whose one ends are connected to the roller brackets 6a, 6b and whose the other ends are connected to the vehicle body frame 1, and hydraulic cylinders 9a, 9b provided on the vehicle body frame 1 and for moving the mast 5 along the roller guides 4a, 4b through the chains 11a, 11b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cargo handling vehicle used in various industries such as a battery type unmanned side forklift and a manned side forklift.

[0002]

2. Description of the Related Art FIG. 3 shows a schematic structure of an example of a conventional cargo handling vehicle (reach forklift). As shown in FIG.
A drive wheel 112 and a driven wheel 1
13 are provided. A mast 114 is slidably provided on the body frame 111. The mast 114 is provided with a fork 115 that can move up and down along the mast 114. Body frame 111
, A hydraulic cylinder 116 is provided. The hydraulic cylinder 116 has a base end fixed to the vehicle body frame 111 and a front end fixed to the mast 114.

In such a cargo handling vehicle, the fork 115
Is inserted under the load, the fork 115 is lifted to lift the load, then the hydraulic cylinder 116 is shortened, the mast 114 is slid and the load is positioned above the vehicle body frame 111, By lowering 115 and placing the load on the vehicle body frame 111, the load can be stably transported.

FIG. 4 shows a schematic structure of another example of a conventional cargo-handling vehicle (side forklift type automatic guided vehicle).

[0005] As shown in FIG. 4, a vehicle frame 121 is provided with drive wheels 122 and driven wheels 123. A mast 124 is slidably provided on the body frame 121. The mast 124 is provided with a fork 125 that can move up and down along the mast 124. One end of a link plate 127a is rotatably connected to the back of the mast 124. The other end of the link plate 127a has a link plate 127b
Is rotatably connected at one end. Link plate 1
The other end of 27b is rotatably connected to the body frame 121. The hydraulic cylinder 1 is mounted on the body frame 121.
The base end of 26 is rotatably connected. The tip of the hydraulic cylinder 116 is rotatably connected to the middle of the link plate 127a.

In such a cargo handling vehicle, the fork 125
Is inserted below the load, the fork 125 is lifted to lift the load, the hydraulic cylinder 126 is shortened, and the mast 124 is slid via the link plates 127a and 127b to transfer the load to the vehicle body frame 12.
When the fork 125 is positioned above the fork 125, the fork 125 is lowered to place the load on the vehicle body frame 121, so that the load can be stably transported.

[0007]

In the former cargo handling vehicle as described above, the stroke length of the hydraulic cylinder 116 is the amount of sliding movement of the mast 114.
In order to increase the amount of sliding movement of the hydraulic cylinder 116, the stroke length of the hydraulic cylinder 116 must be increased, and the hydraulic cylinder 116, which is a high-priced member, becomes large and the component cost increases.

On the other hand, in the latter cargo-handling vehicle, the link mechanism constituted by the link plates 127a and 127b and the like is provided on the body frame 121, so that the space in which the load can be placed becomes small, and The size could not be used effectively.

In view of the above, an object of the present invention is to provide a cargo handling vehicle capable of sufficiently securing a loading space for a load while suppressing an increase in component costs.

[0010]

According to a first aspect of the present invention, there is provided a cargo handling vehicle having a mast, comprising: a plurality of roller guides provided on a vehicle body; A plurality of brackets having rollers movable along a roller guide, a plurality of chains having one end connected to each of the brackets, and the other end connected to the vehicle body, provided on the vehicle body, via the chain And a cylinder for moving the mast along the roller guide.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a cargo handling vehicle according to the present invention is applied to a battery type unmanned side forklift will be described with reference to FIGS. 1 is a partially broken side view, and FIG. 2 is a partially broken plan view.

As shown in FIGS. 1 and 2, a body frame 1 is provided with a driving wheel 2 to be driven and steered, and a driven wheel 3 which is a caster wheel that receives only an axle load. Roller guides 4a and 4b are provided opposite to each other in the inner central portion of the body frame 1 over the entire length in a direction orthogonal to the front-rear traveling direction. A mast 5 is provided between the roller guides 4a and 4b. The mast 5 has roller brackets 6a,
6b is provided. These roller brackets 6a,
The slide rollers 7a and 7b engaged with the roller guides 4a and 4b are rotatably provided on the roller 6b. That is, the mast 5 is mounted on the roller brackets 6a and 6a.
b, roller guide 4 via slide rollers 7a and 7b
It is supported by the vehicle body frame 1 so as to be slidable over the entire length of a and 4b.

As shown in FIGS. 1 and 2, the mast 5 is provided with a fork 8 which can be moved up and down. Body frame 1
A hydraulic cylinder 9a having a stroke length that is approximately half of the entire length of the roller guide 4a is directed to the distal end side of the fork 8 in the protruding direction of the fork 8 near the roller guide 4a near the roller guide 4a. Thus, it is provided along the roller guide 4a. On the other hand, a hydraulic cylinder 9b having a stroke length that is approximately half of the entire length of the roller guide 4b is provided on the distal end side of the fork 8 near the roller guide 4b inside the body frame 1 in the protruding direction. The roller guide 4b is provided along the roller guide 4b such that the tip is directed to the side.

Chain rollers 10a and 10b are rotatably provided at the ends of the hydraulic cylinders 9a and 9b, respectively. These chain rollers 10a, 10
Chains 11a and 11b each having a length approximately half of the entire length of the roller guides 4a and 4b are hung on b, and one ends of the chains 11a and 11b are fixed to the roller brackets 6a and 6b, respectively. The other end is fixed to a longitudinal middle portion of the roller guides 4a and 4b of the body frame 1.

In FIGS. 1 and 2, reference numeral 12 denotes a control device;
Is a battery, 100 is a load, and the control device 12 can control the traveling speed and traveling direction by controlling the driving wheels 2 driven by using the battery 13 as a power source. By controlling a motor, a pump, etc., not shown, which is driven as a controller, the hydraulic pressure of the hydraulic cylinders 9a, 9b can be adjusted so that the hydraulic cylinders 9a, 9b can be expanded and contracted, and the fork 8 can be moved up and down. It has become. The slide rollers 7a and 7b are bearings that support the attachments such as the mast 5 and the fork 8 and the load of the load 100, and roll on the roller guides 4a and 4b during sliding.

In such a battery type unmanned side forklift, the control device 12 controls the motor, the pump, and the like to extend the hydraulic cylinder 9a and synchronize the hydraulic cylinder 9b with the extension of the hydraulic cylinder 9a. When the fork 8 is shortened, the chain roller 10a moves toward the distal end in the protruding direction of the fork 8, one end of the chain 11a is pulled toward the distal end in the protruding direction of the fork 8, and the mast 5 is moved via the roller bracket 6a to the roller guides 4a, 4a.
b, the one end of the chain 11b is pulled toward the tip of the fork 8 in the protruding direction of the fork 8 via the roller bracket 6b with the movement of the mast 5 along with the movement of the mast 5. The mast 5 is located near the side surface of the body frame 1 on the tip side in the protruding direction of the fork 8, and the fork 8 projects from the body frame 1.

On the other hand, when the control device 12 controls the motor, the pump and the like to extend the hydraulic cylinder 9b and shorten the hydraulic cylinder 9a in synchronization with the extension of the hydraulic cylinder 9b, the chain roller 10b The fork 8 moves toward the base end in the protruding direction, and the chain 11b is moved.
Is pulled toward the base end side of the fork 8 in the protruding direction, and the mast 5 is connected to the roller guide 4 via the roller bracket 6b.
a and 4b, the fork 8 slides toward the base end side in the protruding direction, and with the movement of the mast 5,
One end of the chain 11a is also pulled toward the base end of the fork 8 in the protruding direction of the fork 8 via the roller bracket 6a, so that the mast 5 is positioned near the side of the base end of the body frame 1 in the protruding direction of the fork 8. Is located at the center of the body frame 1.

That is, the sliding movement of the mast 5 is pulled through the chains 11a and 11b by the expansion and contraction operations of the hydraulic cylinders 9a and 9b provided in the body frame 1 and having different expansion and contraction directions.

For this reason, the hydraulic cylinders 9a, 9 having a stroke length of substantially half of the entire length of the roller guides 4a, 4b.
b, the mast 5 can be slid over the entire length of the roller guides 4a and 4b.

Therefore, the mast 5 can be slid over the entire length of the roller guides 4a, 4b without using a hydraulic cylinder having a stroke length substantially equal to the entire length of the roller guides 4a, 4b, so that the hydraulic member, which is an expensive member, The parts cost for the cylinder can be reduced.

Further, by providing a mechanism for sliding the mast 5 inside the vehicle body frame 1,
Can be slid over the entire length of the body frame 1, so that the space on the body frame 1 can be used effectively, and a sufficient space for loading the load 100 can be ensured. Can be achieved.

[0022]

In the cargo handling vehicle according to the present invention, in a cargo handling vehicle having a mast, a plurality of roller guides provided on a vehicle body and a plurality of rollers fixed to the mast and movable along the roller guides are provided. Bracket and
A plurality of chains each having one end connected to each of the brackets and the other end connected to the vehicle body, and a cylinder provided on the vehicle body and configured to move the mast along the roller guide via the chains. Therefore, the mast can be slid over the entire length of the roller guide without using a cylinder having a stroke length substantially equal to the entire length of the roller guide, and the space of the vehicle body can be effectively used, and The size can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of an embodiment in which a cargo handling vehicle according to the present invention is applied to a battery type unmanned side forklift.

FIG. 2 is a partially broken plan view of FIG.

FIG. 3 is a schematic structural diagram of an example (reach forklift) of a conventional cargo handling vehicle.

FIG. 4 is a schematic structural view of another example of a conventional cargo handling vehicle (side forklift type automatic guided vehicle).

DESCRIPTION OF SYMBOLS 1 Body frame 2 Drive wheel 3 Driven wheel 4a, 4b Roller guide 5 Mast 6a, 6b Roller bracket 7a, 7b Slide roller 8 Fork 9a, 9b Hydraulic cylinder 10a, 10b Chain roller 11a, 11b Chain 12 Control device 13 Battery 100 Cargo

Claims (1)

[Claims] 1. A cargo handling vehicle having a mast, a plurality of roller guides provided on a vehicle body, a plurality of brackets having rollers fixed to the mast and movable along the roller guides, A chain connected to the bracket and having the other end connected to the vehicle body; and a cylinder provided on the vehicle body and configured to move the mast along the roller guide via the chain. Cargo handling vehicle.