JPS6132958Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an attachment mast piping device for connecting a control valve on the vehicle body side and an attachment drive device installed on a lift bracket.

Conventionally, for forklifts equipped with attachments such as rotating forks and hinged forks,
The piping that connects the attachment drive device (hydraulic cylinder or hydraulic motor) installed on the lift bracket and the control valve on the vehicle body is placed along the outer surface of the outer mast using a pulley or hose reel. However, in the case of such external piping, not only pulleys and hose reels, but also piping parts such as hoses, pipes, and connectors are easily damaged by falling cargo, etc. There are problems with protection. Also,
In order to solve this problem, there is a type of piping that utilizes the inside space of the mast, but such a piping type inside the mast has the problem of obstructing the forward view.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mast piping device for a forklift attachment that can protect piping components and has little to do with forward visibility, in view of the above-mentioned conventional problems.

Next, an embodiment of the present invention will be explained with reference to the drawings. In the drawing, 1 is a mast vertically installed on the left and right sides of the front end of the vehicle body T. It is composed of a mast 2 and an inner mast 3 attached to the outer mast 2 via lift rollers 4 so as to be movable up and down. 7 is a lift cylinder for raising and lowering the lift bracket 12, and 1 is installed behind the left and right masts 1.
The piston rods 8 are placed upright on the lower cross beam 5 that connects the lower ends of the outer mast 2, and the upper end of each piston rod 8 connects the upper ends of the inner mast 3. Brackets 1 attached to the left and right ends of beam 6
It is fixed at 0. Also, this bracket 10
A chain wheel 9 is attached to each of the chain wheels 9, and a lift chain 11 hung from each chain wheel 9 has one end fixed to a lift cylinder 7 and the other end fixed to a lift bracket 12. The lift bracket 12 includes a pair of left and right rear plates 14 having lift rollers 13 that roll within the inner mast 3, and a front plate 15 fixed to the upper and lower front surfaces of the rear plates 14. is equipped with attachments (not shown) such as a rotating fork and a roll clamp.

Reference numeral 16 denotes a head guard frame body mounted on the vehicle body T side. This head guard frame body 16 has a head guard 17 and four pillars 24, which are formed into a substantially rectangular shape by left and right head guard frame members 18 and front and rear head guard frame members 23. The width of the head guard 17 is approximately equivalent to the width of the vehicle body, and the left and right head guard frames 18 are mounted outside the mast 1 as shown.

Reference numeral 18 denotes left and right head guard frame members of the above-mentioned head guard 17, which includes a base frame 19 having a substantially sealed box-shaped cross section, and a sliding frame 20 having a substantially U-shaped cross section on the lower surface of the base frame 19. are provided along the longitudinal direction, and a corresponding elongated sliding groove 22 is provided penetrating approximately at the center of the opposing pieces 21 of the sliding frame 20 in the longitudinal direction.

Reference numeral 25 denotes a pulley that is installed so as to be movable back and forth along the sliding groove 22 of 20, and is pivotally connected to a shaft 26. A roller 27 is rotatably attached to. Furthermore, approximately U is provided at both ends of the shaft 26.
A spring 30 having a predetermined tension is engaged with the engaging portion 29 of the connecting fitting 28, and the other end of the spring 30 is attached to the end of the sliding frame 20. It is engaged with a locking metal fitting 31 attached to the end side. In this embodiment, the pulley 25 is configured to have one hydraulic hose 32 hung thereon. A hydraulic hose 32 having a predetermined length is hung on the pulley 25, which is mounted on the head guard frame 18 via a spring 30 so as to be able to move forward and backward, and one end of the hydraulic hose 32 is connected to a control on the vehicle body side. Piping 33 disposed inside the column 24 on the front side of the head guard frame 16 from the valve.
The other end of the hydraulic hose 32 is connected to a guide pulley 35 that is pivotally connected to the front end of the head guard frame member 18, for example, to the support 24 via a bracket 34. The hose 32 is arranged at a predetermined distance on the outside of the mast 1, and the other end of the hydraulic hose 32 is connected to a rotary joint 36 attached to the back side of the left and right ends of the upper front plate 15 of the lift bracket 12. ing. Further, an upper guide pulley 37 is pivotally attached to the front part of the base frame 19 of the head guard frame member 18 in a manner that corresponds to the guide pulley 35 and is close to the guide pulley 35 as shown. Although not shown, the rotary joint 36 and the attachment drive device are connected via a pipe.

Next, the operation and effects of this embodiment configured as described above will be explained.

Now, in this example attachment mast piping device, a pulley 25 on which a hydraulic hose 32 is hung within the left and right head guard frame members 18 of a head guard frame 16 mounted on the vehicle body T side is elastically moved back and forth via a spring 30. At the same time, one end of the hydraulic hose 32 hung on the pulley 25 is connected to the rotary joint 36 attached to the lift bracket 12 through the front end opening of the head guard frame 18, and the hydraulic hose 32 is connected to the outside of the mast 1. pulley 25
It is arranged so that it can be expanded and contracted in a tensioned manner through the . Therefore, since the hydraulic hose 32 is disposed on the outside of the mast 1 via the pulley 25 in a tensioned and expandable manner, the lift bracket 12 is positioned at the lower end as shown in FIG. At times, the hydraulic hose 32 is stretched over almost its entire length against the tension of the spring 30, and
During the lifting process of the lift bracket 12, the pulley 25 is moved toward the rear end along the sliding groove 22 by the restoring force of the spring 30, absorbing the slack of the hydraulic hose 32, and the rotary joint 36 attached to the lift bracket 12 is moved. When positioned approximately at the same level as the head guard frame 18, almost the entire length of the hydraulic hose 32 is housed within the head guard frame 18. At this point, the hydraulic hose 32 is disengaged from the guide pulley 35, and when the lift bracket 12 further rises, the hydraulic hose 32 is engaged with the upper guide pulley 37, and as the lift bracket 12 rises, the hydraulic hose 32 is pulled out again. be done. In this way, the hydraulic hose 32 moves tensionally and expands and contracts on the outside of the mast 1 following the rise and fall of the lift bracket 12, so the field of view from the driver's seat is greatly improved, making it easier to carry out cargo handling and traveling operations. Safety can be increased. In addition, most of the piping parts are
Since it is not exposed to the outside, it can significantly reduce damage caused by falling cargo or colliding with other objects during cargo handling or driving.This also reduces the number of piping parts, which is extremely advantageous in terms of cost reduction. be. In addition, since the hydraulic hose 32 is always under tension, it has many advantages, such as being able to eliminate the problem of the hose getting caught between the mast and the front protector.

In this embodiment, one hydraulic hose 32 is provided on each of the left and right head guard frame members 18, but it may be provided on either the left or the right. Various types of piping, such as this piping, are possible, and its versatility is extremely wide.

Now, in the present invention, a pulley for hanging a hydraulic hose is mounted in the left and right head guard frame members of a head guard frame mounted on the vehicle body side so as to be able to move forward and backward via a spring, and one end side of the hydraulic hose is The hydraulic hose is connected to the rotary joint attached to the lift bracket from the front end opening of the head guard frame member, and the hydraulic hose is arranged on the outside of the mast via the pulley in a tensioned and expandable manner. Therefore, according to the present invention, forward visibility is greatly improved, safety in cargo handling and driving operations is improved, and work efficiency is improved, and most of the piping parts are exposed outside the vehicle body. This design is highly practical as a mast piping system for forklift attachments, as it can significantly reduce the chance of parts being damaged due to falling cargo, etc.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a schematic plan view of the mast side of a forklift, Fig. 2 is a schematic side view of the forklift, Fig. 3 is an enlarged longitudinal sectional view of the head guard, and Fig. The figure is an enlarged vertical cross-sectional view taken along the line -- in FIG. 3, and FIG. 5 is an enlarged horizontal cross-sectional view taken along the line -- in FIG. 1...Mast, 10...Lift bracket, 1
6...Head guard frame body, 18...Head guard frame material, 25...Pulley, 30...Spring, 3
2...Hydraulic hose, 36...Rotary joint, T...Vehicle body.

Claims (1)

[Scope of utility model registration request] A pulley for hanging a hydraulic hose is mounted in the left and right head guard frame members of the head guard frame mounted on the vehicle body so as to be movable back and forth via a spring, and one end of the hydraulic hose is connected to the front end of the head guard frame member. A mast for an attachment of a forklift, characterized in that the hydraulic hose is connected to a rotary joint attached to a lift bracket from an opening and is arranged on the outside of the mast in a tensioned manner and extendable through the pulley. Plumbing equipment.