JPH061596A - Mast structure of forklift truck - Google Patents

Abstract

PURPOSE:To allow the back and forth and right and left adjustment of a mast for a base at one place, right or left. CONSTITUTION:A mast structure of forklift truck is provided with a pair of right and left outer masts 22 formed in U-shaped configuration in cross section, and a pair of inner masts 26 having U-shaped configuration in cross section juxtaposed on the inner side of the outer mast 22 and provided with paired sliding frames 30 juxtaposed on the inner side of the rear flange 24 of the outer mast 22, on the back flange 24 side of the side frame. An inner mast roller is pivotally mounted on the inner mast 26 at its lower part. On the outer mast 22 at its upper part, an outer mast roller is pivotally mounted, which rolls slidably on the inner surface of the sliding frame 30 and a projected surface for slide crossing with the inside surface at right angles. In this mast structure, at the inner mast 26 at its back part is formed a declined surface 31 declined at a predetermined angle to the sliding frame 30 at its inside surface. A sliding top member 32 is adjustably provided between the declined surface 31 and the flange in the outer mast 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mast structure for a forklift truck.

[0002]

2. Description of the Related Art Conventionally, the structure of a mast 1 of a forklift truck of this type is composed of a pair of left and right outer masts 2 which are attached to a vehicle body M and left and right inner masts 6 which are moved up and down by the outer masts 2. As shown in FIG. 4, the outer mast 2 has a substantially U-shaped cross section by a side frame 3 having a predetermined width and front and rear flanges 4, 5, and the inner mast 6 has a cross sectional shape of the outer mast 2. 3, the side frame 7 and the front and rear flanges 8 and 9 which substantially correspond to 3 have a substantially U-shaped cross section,
The outer mast 2 is provided on the rear flange 9 side of the same inner mast 6.
A sliding frame 10 facing the rear flange 5 is integrally formed. On the lower side of the inner mast 6 thus formed, the inner surface 5a of the rear flange 5 of the outer mast 2 and the side frame 3 are formed.
An inner mast roller 11 which is formed in the longitudinal direction of the inner surface of the inner roll and rolls on the sliding convex surface 3a is pivotally attached. Further, a part of the front flange 4 is cut out C at the upper part of the outer mast 2 and the inner mast 6 is formed at the upper part. An outer mast roller 12 which is formed in the longitudinal direction of the inner side surface 10a of the sliding frame 10 and the outer side surface of the side frame 7 and guides the sliding convex surface 7a to roll is pivotally mounted via a roller pin 13. Note that FIG. 4 is a cross-sectional view taken along the line AA in FIG. 5, and in FIG. 4, the upper side shows the front part and the lower side shows the rear part.

The mast 1 provided in this way is for positioning adjustment for smoothing the vertical movement of the inner mast 6 with respect to the outer mast 2. Therefore, the adjustment in the front-back direction of the vehicle body M is performed on the upper side of the outer mast 2 as shown in FIG. Outer peripheral surface of mast roller 12 and inner surface 10a of sliding frame 10
The sliding adjustment is adjusted by the sliding piece member 14 and the shim 18, and the sliding piece member 14 is a substantially flat plate-shaped sliding piece 15 and round bar-shaped at a predetermined interval above and below this one surface. The leg portion 16 is integrally formed, and the sliding piece member 15 is used as the outer mast 2
A substantially U-shaped shim 18 is inserted between the sliding piece 15 and the rear flange 5 by being inserted into a mounting hole 17 formed at a predetermined position on the upper side of the rear flange 5 corresponding to the leg portion 16. It is inserted and adjusted. Further, the adjustment in the left-right direction with respect to the vehicle body M is performed by adjusting the sliding adjustment between the side surface of the outer mast roller 12 and the sliding convex surface 7a of the inner mast 6 between the stepped portion 13a of the roller pin 13 and the inner ring 12a of the outer mast roller 12.
It has been adjusted through. It should be noted that these adjustments are performed when the mast 1 is assembled.

[0004]

However, since the adjustment of the outer mast 2 and the inner mast 6 of the conventional mast 1 must be performed at two positions (on one side) on the roller pin 13 side and the sliding frame 10 side, it is extremely troublesome. In particular, the adjustment on the left and right sides of the machine base M is a rough adjustment work in the current assembling work, which causes problems such as rattling and noise.

The present invention has been made to solve the above conventional problems, and provides a mast structure of a forklift truck capable of adjusting the front and rear and left and right of the mast with respect to the machine base at one left and right position. It is intended.

[0006]

SUMMARY OF THE INVENTION In order to solve the above technical problems, the present invention provides a pair of left and right outer masts each having a substantially U-shaped cross section, and a side frame and a front and rear face that are installed inside the outer masts. An inner mast having a substantially U-shaped cross section formed by the flange and a sliding frame formed opposite the inner flange of the outer mast is provided on the rear flange side of the same side frame. A mast structure in which a mast roller is pivotally mounted, and an outer mast roller for rolling and slidingly contacting an inner side surface of the sliding frame and a sliding convex surface perpendicular to the inner side surface is pivotally mounted on an upper portion of the outer mast. An inclined surface that is inclined at a predetermined angle with respect to the inner side surface of the sliding frame is formed at the rear portion, and a sliding piece member is interposed between the inclined surface and the inner flange of the outer mast so as to be adjustable. Resides in the mast structure of a forklift truck that was.

[0007]

With the above construction, adjustment of the inner side surface a of the sliding frame of the inner mast with respect to the outer mast roller and the sliding convex portion perpendicular to the inner side surface is performed by adjusting the sliding piece member with respect to this inclined surface. By adjusting the shim, it is possible to position the inner mast in the front, back, left and right at one location.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a horizontal cross-section of one of the outer mast 22 and the inner mast 26 of the lift 1 on the upper side similarly to the conventional example. The outer mast 22 has a side frame 23 having a predetermined width and a front and rear flange as in the conventional case. The outer mast 22 and the side frame 2 are formed to have a substantially U-shaped cross section by 24 and 25.
The inner mast roller 11 is formed so as to roll on the sliding convex surface 23a formed in the inner surface longitudinal direction of No. 3 of the drawings. A part of the front flange 24 is cut out at the upper end of the outer mast 22, and the outer mast roller 12 is pivotally mounted at a predetermined position on the upper end via a roller pin 13.

The cross section of the inner mast 26 is formed into a substantially U-shaped cross section by the side frame 27 substantially corresponding to the side frame 23 of the outer mast 22 and the front and rear flanges 28 and 29, and the rear flange 29 of the inner mast 26 is also formed. On the side, a sliding frame 30 is integrally formed with the rear flange 25 of the outer mast 22 so as to be opposed thereto, and an inner surface 30a of the sliding frame 30 is formed.
And the sliding convex surface 27a formed along the longitudinal direction of the outer surface of the side frame 27 is formed at a right angle so that the outer mast roller 12 can slide and roll, and the surface on the rear side of the sliding frame 30. An inclined surface 31 is formed along the longitudinal direction, which is inclined with respect to the inner surface 30a from the front end side of the sliding frame 30 toward the rear side of the center line of the machine base M at a predetermined angle α. A sliding piece member 32 is interposed between the sliding frame 30 and the outer mast 22 of the inner mast 27 thus formed.

This sliding piece member 32 is a conventional sliding piece member 1.
The sliding piece 33 has a flat plate shape and two round bar-shaped leg portions 34 are integrally formed on one surface 33a of the sliding piece 33 at a predetermined interval. The inclined surface 31 of the sliding frame 30 of the inner mast 26 of the sliding piece 33
The surface that slides with is parallel to the inclined surface 31, that is, the surface 33a
In contrast, an inclined surface 35 having an angle α is formed. The sliding piece member 32 formed in this way is mounted in the mounting hole 17, and the shim 18 is inserted between the sliding piece 33 and the rear flange 25 of the outer mast 22 to insert the sliding frame 30 of the inner mast 26. The rolling sliding contact of the outer mast roller 12 with respect to the inner side surface 30a and the sliding convex surface 27a is adjusted, and the positioning of the inner mast 26 with respect to the outer mast 22 is adjusted.

In this embodiment, the outer mast roller 12 pivotally mounted on the outer mast 22 as described above.
Is provided slidably in rolling contact with the inner side surface 30a of the sliding frame 30 of the inner mast 26 and the sliding convex portion 27 that is perpendicular to the inner side surface 30a, and the rear side surface of the sliding frame 30 is the inner side surface 30a. An inclined surface 31 is provided at a predetermined angle .alpha. From the front end side to the rear side of the center line of the machine base M, and the sliding piece member is adjustable between the inclined surface 31 and the rear flange 25 of the outer mast 22. Since the inner side surface 30a of the sliding frame 30 of the inner mast 26 with respect to the outer mast roller 12 and the sliding convex portion 27 perpendicular to the inner side surface 30a are adjusted with respect to the inclined surface By adjusting the sliding piece member 32 with respect to 31 by a shim, the front and rear, left and right of the inner mast 26 can be easily positioned at one place, and the conventional shim adjustment on the roller pin 13 side can be eliminated. TEMA Framework structure DOO 21 is facilitated.

Next, another embodiment of the present invention will be described with reference to FIG. The outer mast 42 is formed in a substantially U-shaped cross section by a side frame 43 having a predetermined width and front and rear flanges 44 and 45. The outer mast 42 is formed in the inner surface 45a of the rear flange 45 of the outer mast 42 and the inner surface longitudinal direction of the side frame 43. The inner mast roller 11 is formed so as to roll on the formed sliding convex surface 43a. A part of the front flange 44 is cut out at the upper end of the outer mast 42, and the outer mast roller 12 is pivotally mounted at a predetermined position on the upper end via a roller pin 13. In the longitudinal direction of the end surface of the rear flange 45 of the outer mast 42 thus formed, an inclined surface 45b is formed at a predetermined angle α with respect to the inner surface 45a.

The cross section of the inner mast 46 is formed into a substantially U-shaped cross section by the side frame 47 substantially corresponding to the side frame 43 of the outer mast 42 and the front and rear flanges 48 and 49, and the rear flange 49 of the inner mast 46. On the side, a sliding frame 50 is integrally formed with the rear flange 45 of the outer mast 42 so as to be opposed thereto, and an inner surface 50a of the sliding frame 50 is formed.
And a sliding convex surface 47a formed along the longitudinal direction of the outer surface of the side frame 47 is formed in a right angle so that the outer mast roller 12 can slide and roll, and the base of the sliding frame 50 and the rear flange. The inner surface 50a of the sliding frame 50 is located between the base of the sliding frame 50.
On the other hand, an inclined surface 51 is formed along the longitudinal direction toward the rear side of the center line of the machine base M, that is, in parallel with the inclined surface 45b of the rear flange 45 of the outer mast 42 at a predetermined angle α.

The inner mast 46 thus formed is slidably opposed to the outer mast 42, and a mounting hole 17 is formed in a right angle at a predetermined position above the inclined surface 45b of the rear flange 45 of the outer mast 42. The sliding piece member 14 similar to the conventional one is inserted through the mounting hole 17 and the inclined surface 51 of the inner mast 46, and the shim 1 is provided.
It is provided to be adjustable by 8. Therefore, in this embodiment as well, the same actions and effects as those of the above-described embodiment can be expected, and since the load in the thrust direction is not applied to the sliding piece member 17, there is no obstacle such as shearing of the leg portion 16. There is an advantageous advantage in terms of strength.

[0015]

As described above, according to the present invention, an inclined surface which is inclined at a predetermined angle with respect to the inner side surface of the sliding frame is formed at the rear portion of the inner mast, and the inclined surface and the rear flange of the outer mast are disposed between the inclined surface and the outer mast. Since the sliding piece member is adjustable so that the inner mast can be easily positioned in the front, rear, left and right at one location, the conventional shim adjustment on the roller pin side can be eliminated. The structure of the mast framework is also easy.

[Brief description of drawings]

FIG. 1 is a horizontal cross-sectional view showing a relationship between an outer mast roller and an inner mast at an upper end portion of the outer mast.

FIG. 2 is a perspective view of a sliding piece member.

FIG. 3 is a horizontal cross-sectional view showing another aspect of the outer mast roller and the inner mast at the upper end portion of the outer mast.

FIG. 4 is a horizontal sectional view showing a relationship between an outer mast roller and an inner mast at an upper end portion of a conventional outer mast.

FIG. 5 is a side view of a forklift truck.

[Explanation of symbols]

 21 Mast 22,42 Outer mast 23,43 Side frame 23a, 43a Sliding convex surface 24,44 Front flange 25,45 Rear flange 26,46 Inner mast 27,47 Side frame 28,48 Front flange 29,49 Rear flange 30,50 Sliding Moving frame 31,51 Inclined surface 14,32 Sliding piece member

Claims (1)

[Claims] 1. A pair of left and right outer masts having a substantially U-shaped cross section, and a pair of side frames and front and rear flanges that face each other inside the outer mast and have a substantially U-shaped cross section, and the same side. An inner mast having a sliding frame formed opposite the inner flange of the outer mast is provided on the rear flange side of the frame, an inner mast roller is pivotally attached to the lower part of the inner mast, and the inner mast roller is slid on the upper part of the outer mast. In a mast structure in which an outer mast roller for rollingly slidingly contacting the inner side surface of the frame and the sliding convex surface at a right angle to the inner side surface is pivotally attached,
An inclined surface that inclines at a predetermined angle with respect to the inner surface of the sliding frame is formed at the rear portion of the inner mast, and a sliding piece member is interposed between the inclined surface and the inner flange of the outer mast so as to be adjustable. The mast structure of a forklift truck configured to