JPH0725596A - Mast device - Google Patents

Abstract

PURPOSE:To extensively improve productivity by a mast device applied to a cargo handling vehicle of a forklift and others. CONSTITUTION:This device is constituted of an outer frame 2, an outer frame connecting material 3, an inner frame 4, an inner frame connecting material 5 and a combindly used roller 6, and especially, the outer frame 2 and the inner frame 4 are arranged to make their groove parts face against each other by way of making their sections roughly in L shapes, and between them, front and rear doubly used rollers 6 to bear resultant force of a load in the longitudinal direction and a load in the lateral direction is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a mast device applied to a cargo handling vehicle such as a forklift truck.

[0002]

2. Description of the Related Art Conventionally, as this type of mast device, for example, the one described in Japanese Utility Model Publication No. 60-19115 is known. Basically, this includes a left and right outer frame having a substantially C-shaped cross section and arranged so that the groove portions face each other, an outer frame connecting member for connecting the outer frames, and a substantially C-shaped or J-shaped cross section. The left and right inner frames arranged inside the outer frame so that the groove portions face each other,
An inner frame connecting member that connects the inner frames to each other, an end roller that is provided between the outer frame and the inner frame to carry a load in the front-rear direction, and an end roller that is provided between the outer frame and the inner frame and that is arranged in the left-right direction. And a side roller that carries a load. However, in such a structure, the outer frame has a substantially C-shaped cross section, and the inner frame has a substantially C-shaped cross section, a J-shaped profile, and the like, which is a special shape that is not commercially available in general. In many cases, it was welded and manufactured, and distortion was often generated. Therefore, there is a problem that productivity is poor.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and was devised to solve the problem. The object of the present invention is to improve the productivity. To provide.

[0004]

The mast device of the present invention comprises:
Basically, the left and right outer frames having a substantially L-shaped cross section and arranged to face each other, an outer frame connecting member that connects the outer frames to each other, and a substantially L-shaped cross section so that the groove portions face each other. The left and right inner frames arranged inside the outer frame, the inner frame connecting material that connects the inner frames to each other, and the resultant force between the front and rear loads and the left and right loads provided between the outer and inner frames. It is characterized in that it is composed of a dual-purpose roller before and after carrying.

[0005]

[Operation] The inner frame is moved up and down with respect to the outer frame. At this time, the inner frame is guided by the front and rear combined rollers. When a load in the front-rear direction and a load in the left-right direction act on the inner frame, the resultant force of these is carried by the front and rear combined rollers. Therefore, smooth lifting and lowering is performed.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view across the right half of a mast device according to a first embodiment of the present invention. Mast device 1
The outer frame 2, the outer frame connecting member 3, the inner frame 4, the inner frame connecting member 5, and the combined-use roller 6 constitute the main part thereof, and in this example, it is applied to a cargo handling vehicle such as a forklift. The outer frame 2 is a left and right one having a substantially L-shaped cross section and arranged so that the groove portions face each other. In this example, an off-the-shelf angle member such as JIS is used, and the two flanges are arranged in the front-back direction (Fig. No. 1 in the vertical direction) and the horizontal direction (the horizontal direction in FIG. 1) are not followed, and they are arranged at an angle of 45 degrees so as to be positioned in the front and rear inclined state. The outer frame connecting member 3 connects the outer frames 2 to each other, and in this example, is a flat plate that connects the rear ends of the rear flanges of the outer frame 2. The inner frame 4 has a substantially L-shaped cross section and is arranged on the inside of the outer frame 2 so that the groove portions face each other. In this example, an angle member smaller than the outer frame 2 is used. As in the case of 2, the two flanges are arranged at an angle of 45 degrees so as not to extend in the front-rear direction and the left-right direction but to be positioned in the front-rear inclined state. Inner frame connecting material 5
Is for connecting the inner frames 4 to each other, and in this example, is a flat plate for connecting the rear ends of the rear flanges of the inner frame 4. The dual-purpose roller 6 is provided between the outer frame 2 and the inner frame 4, and is a front and rear roller that carries a resultant force of a front-rear direction load and a left-right direction load. In this example, it is a side roller type. It is provided above and below between the front and rear flanges of the outer frame 2 and the front and rear flanges of the inner frame 4. The front and rear dual-purpose rollers 6 are axially installed inside the upper and lower flanges of the outer frame 2 and roll on the outer surfaces of the front and rear flanges of the inner frame 4. The lower front and rear combined rollers 6 are axially provided outside the lower portions of the front and rear flanges of the inner frame 4 and roll on the inner surfaces of the front and rear flanges of the outer frame 2. The outer frame 2 and the outer frame connecting member 3 form an outer mast A, and the inner frame 4 and the inner frame connecting member 5 form an inner mast B. Inside the inner mast B, a lifting body is provided. C is provided. In this example, the lifting / lowering body C includes the left and right lift brackets 7 and the finger bars 8 provided on the front side thereof.
And the left and right angle members 9 that are provided outside the lift brackets 7 and are similarly arranged inside the inner frame 4 and smaller than these, and are provided above and below the front and rear flanges of the inner frame 4. It is composed of side roller type front and rear combined rollers 10 that roll on the inner surfaces of the front and rear flanges. Next, the operation will be described based on such a configuration. The inner mast B moves up and down with respect to the outer mast A, and the inner mast B
The elevating body C is moved up and down. At this time, the inner mast B is guided by the front and rear combined rollers 6 and is moved up and down with respect to the outer mast A, and the elevating body C is moved forward and backward.
And is moved up and down with respect to the inner mast B. When a load in the front-rear direction and a load in the left-right direction act on the elevating body C and the inner mast B, the combined force of these is carried by the front and rear combined rollers 6 and 10. Therefore, smooth lifting and lowering is performed.

Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the lifting body C is composed of the lift bracket 7, the finger bar 8 and the combined use roller 10 and the angle member 9 is omitted. The combined use roller 10 is axially provided above and below the respective lift brackets 7. It differs from the first embodiment in that the front and rear flanges of the frame 4 are of a tapered end roller type that rolls.

Although the inner frame 4 is smaller than the outer frame 2 in the previous embodiment, the invention is not limited to this, and for example, the outer frame 2 may be used.
It can be the same size as. In the above embodiment, the dual-purpose roller 6 is provided without cutting the outer frame 2 and the inner frame 4, but the present invention is not limited to this, and the outer frame 2 and the inner frame 4 may be provided with the cutout, for example.

[0009]

As described above, according to the present invention,
The following excellent effects can be achieved. (1) It is composed of an outer frame, an outer frame connecting member, an inner frame, an inner frame connecting member, and a dual-purpose roller, and in particular, the outer frame and the inner frame are made to have a substantially L-shaped cross section and arranged so that the groove portions face each other. Since the front and rear combined rollers that carry the resultant force of the load in the front-rear direction and the load in the left-right direction are provided between, the ready-made angle member can be used, and the productivity can be greatly improved. (2) Since the same type of dual-purpose roller is used, the number of types of parts is reduced, which can contribute to cost reduction.

[Brief description of drawings]

FIG. 1 is a plan view across a right half of a mast device according to a first embodiment of the present invention.

FIG. 2 is a view similar to FIG. 1 showing a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mast device, 2 ... Outer frame, 3 ... Outer frame connecting material, 4 ... Inner frame, 5 ... Inner frame connecting material, 6,10 ... Combined use roller, 7 ... Lift bracket, 8 ... Finger bar, 9 ... Angle material ,
A ... Outer mast, B ... Inner mast, C ... Lifting body.

Claims (1)

[Claims] 1. A left and right outer frame having a substantially L-shaped cross section and arranged so that the groove portions are opposed to each other, an outer frame connecting member for connecting the outer frames to each other, and a groove portion having a substantially L-shaped cross section so as to face each other. The left and right inner frames arranged inside the outer frame, the inner frame connecting material that connects the inner frames to each other, and the resultant force between the front and rear loads and the left and right loads provided between the outer and inner frames. A mast device characterized in that it is composed of a front and rear combined roller for carrying the.