JPS6323436Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reach forklift truck.

As shown in FIG. 1, the reach fork lift truck has a frame a with a pair of reach legs b, and a mast part c that is slidable along the pair of reach legs b.

In other words, reach leg b is a guide member for roller d of mast section c. e is boring.

As shown in FIGS. 2 to 5, the reach leg b consists of a U-shaped rail f that slides and guides the roller d in the front-rear direction, and a cover g provided on the top of the rail f. This is to cover the wheels (tires) h provided on the rail f and to improve the rigidity (particularly to prevent twisting) of the entire reach leg.

However, with this structure, as shown in FIGS. 6 and 7, a pair of rollers d and d' attached to the mast part c face the inside of the rail f of the reach leg b, and the wheel h faces the rail f of the reach leg b. Since it is necessary to protrude further downward and make contact with the ground, it is attached to the outer wall of the rail f, so the mounting positions of the pair of rollers d, d' and the wheel h are shifted, and the pair of rollers of the mast part c is attached to the reach leg b. At points d and d', an upward force W ₃ is applied by the rear roller d', a downward force W ₂ is applied by the front roller d, and a force W ₁ applied to the wheel h from the road surface acts, and the above-mentioned upper and lower Direction force W ₃ ,
Since the points of application of W ₂ and force W ₁ are separated by a distance of L ₁ , a large bending moment will act on reach leg b, and reach leg b must be made structurally rigid to prevent twisting. This results in high costs.

The present invention was developed in view of the above circumstances, and its purpose is to align the points of application of the force from the rollers of the mast section and the force from the wheels acting on the reach leg so that no bending moment is applied. To provide reach forklift trucks.

Embodiments of the present invention will be described below with reference to FIG. 8 and subsequent figures.

FIG. 8 is an overall front view, and a pair of left and right reach legs 2, 2 are fixedly fixed to the front of the vehicle body 1 equipped with a driver's seat, and a mast part 3 is mounted front and rear along the pair of reach legs 2, 2. It is slidably provided.

The mast section 3 includes a mast 5 that supports a fork claw 4 so as to be able to move up and down, and a cross member 6 that is integrally provided to the mast 5 toward the rear. A stop plate 8 is provided, and the cross member 6 is provided with a rear roller 9.

The reach leg 2 has an upper horizontal wall 10 and a vertical wall 11.
and the lower horizontal wall 12 form an inward U-shape, and the front roller 7 is in sliding contact with the upper surface 10a of the upper horizontal wall 10.
The rear roller 9 is in sliding contact with the lower surface 10b, and the stop plate 8 is in slidable contact with the lower surface 10b, and the front end of the lower horizontal wall 12 The portion is cut out 12a, and a support shaft 13 is provided at the front end portion of the inner surface 11a of the vertical wall 11.
A wheel 14 is rotatably supported, and the wheel 14, the front roller 7, and the rear roller 9 are at the same position in the left-right direction.

That is, as shown in FIGS. 13a to 13d, the reach leg 2 is formed by integrally molding a U-shaped machine frame with a vertical wall 11 and upper and lower horizontal walls 10 and 12 by hot extrusion.
A notch 1 is cut out on the front end side of the lower horizontal wall 12 of this U-shaped member 2'.
2a, a support shaft 13 is welded and fixed to the inner surface 11a of the vertical wall facing that part, and a wheel 14 is attached to this support shaft 13.
Manufactured by supporting it rotatably.

Thus, in the mast part 3, the front roller 7 and the rear roller 9 are connected to the upper surface 10a of the upper horizontal wall of the reach leg 2,
Since the front roller 7 moves in the front-rear direction by sliding along the lower surface 10b, the front roller 7 does not interfere with the wheels 14.

Further, as shown in FIG. 14, the front roller 7 is pressed against the upper surface 10a of the upper horizontal wall 10 by a force of _W2 , and the rear roller 9 is pressed against the lower surface 10b of the upper horizontal wall 10.
The wheel 14 is pushed up by the force W ₃ and pressed against the road surface by the force W ₁ , but the front roller 7, rear roller 9, and wheel 14 are in the same position in the left and right direction and are arranged vertically side by side. From, each of the above forces W ₁ ,
The points of action of W ₂ and W ₃ are approximately on the same line, and almost no bending moment acts on the reach leg 2.

Therefore, there is no need to increase the rigidity of the reach legs 2 to prevent twisting, so costs can be reduced.

The present invention is as described above, and the wheel 14 can protrude below the lower lateral wall 12 through the notch 12a formed in the lower lateral wall 12 of the reach leg 2 and touch the ground. Since the rear rollers 9 are at the same position in the left and right direction, the upper surface 10 of the upper horizontal wall 10 of the reach leg 2
a, the lines of action of the downward force W ₂ acting on the lower surface 10b, the upward force W ₃ , and the force W ₁ acting on the wheel 14 are approximately straight lines, and no large bending moment acts on the reach leg 2, so the rigidity There is no need to make it large to prevent twisting.

Therefore, the reach leg 2 can be manufactured at a low cost with a simple structure, and the reach forklift truck can be manufactured at a low cost.

[Brief explanation of the drawing]

Figure 1 is a front view of the conventional example, Figure 2 is a perspective view of the reach leg, Figure 3 is a plan view, Figure 4 is a sectional view,
Fig. 5 is an exploded perspective view, Fig. 6 is an explanatory diagram of the operating state of each force, Fig. 7 is an explanatory diagram of installing the rollers on the mast section, Fig. 8 is an overall front view showing an embodiment of the present invention, Fig. 9 is a front view, FIG. 10 is a sectional view taken along the line X-X in FIG. 8,
Figure 11 is an explanatory diagram of installing the rollers in the mast section, Figure 12 is
The figure is a sectional view of the wheel mounting part, Figure 13 a, b, c,
d is an explanatory diagram of the manufacturing process of the reach leg, and FIG. 14 is an explanatory diagram of the action state of each force. 2 is a reach leg, 10 is an upper horizontal wall, 10a is an upper surface, 10b is a lower surface, 11 is a vertical wall, 11a is an inner surface,
12 is the lower horizontal wall, 12a is the notch, 13 is the support shaft, 14
is a wheel.

Claims (1)

[Scope of utility model registration request] The vehicle body 1 has an upper horizontal wall 10, a vertical wall 11, and a lower horizontal wall 12.
A pair of left and right reach legs 2, 2, which have an inward U-shape and have a notch 12a at the front end of the lower horizontal wall 12, are installed, and the notch 12 of each reach leg 2 is attached.
Wheels 14 are attached to the inner side surface 11a of the vertical wall facing the upper horizontal wall 10 and protruding below the lower horizontal wall 12 from the notch 12a, respectively.
A front roller 7 that contacts the upper surface 10a of the upper horizontal wall 10 and a rear roller 9 that contacts the lower surface 10b of the upper horizontal wall 10 are attached to the mast section 3 provided between the pair of reach legs 2, 2, on the left and right sides of the wheels 14. A reach fork lift truck characterized by being provided at the same position in each direction.