JPH0127507Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to an anti-slip bolt attached to the track tracks of a tracked vehicle.

(b) Prior Art As shown in FIGS. 7 and 8, crawlers 2 constituting the crawler tracks of a tracked vehicle are attached to a track 1 with mounting bolts 3 and nuts 4. When operating a tracked vehicle on snow or ice,
As shown in the figure and FIG.
A plurality of anti-slip bolts 5 having heads 5a protruding from a and 2b are attached with nuts 6. head 5
The size of a is smaller than the spacing between the lugs 2a, 2b. In track shoes equipped with such anti-slip bolts 5, the anti-slip bolts 5 tend to loosen due to concentrated loads applied to the tips of the heads 5a protruding from the lugs 2a, 2b. Further, when installing the anti-slip bolt 5, it is necessary to prevent the bolt 5 or nut 6 from rotating.

(c) Problems that the invention aims to solve This invention was created in view of the above.
It is an object of the present invention to provide an anti-slip bolt that has a rotation preventing effect.

(d) Means for solving the problem This invention is intended to achieve the above object, and is an anti-slip bolt for track shoes having a head projecting from the lug of the shoe. It is characterized in that a rotation preventing surface is formed on the opposite side of the tip to the side surface of the lug.

(e) Effect The anti-rotation surface formed on the head comes into contact with the side surface of the lug and exerts an anti-rotation effect.

(f) Example A first example of this invention will be explained with reference to FIGS. 1 and 2.

The opposite tip of the head 8 of the anti-slip bolt 7 is a hexagonal part 8
a, the tip end side part is a conical part 8b, and the hexagonal part 8a is formed so as to be in contact with the side surfaces (slanted surfaces) of the lugs 2a and 2b. That is, the surface of the hexagonal portion 8a serves as a rotation preventing surface for the lugs 2a and 2b.

When tightening the nut 6, the anti-rotation surface 8a of the head 8
Since the lug contacts the side surfaces of the lugs 2a and 2b to prevent rotation, the anti-slip bolt 7 does not rotate together, and only the nut 6 can be tightened. Therefore, the installation work becomes easy. The tip of head 8 is lug 2
Since the lugs protrude from the lugs 2a and 2b, concentrated loads due to the weight of the vehicle body etc. are applied during work, but the lugs 2a and 2b
Since the anti-rotation surface 8a is in contact with the side surface of b, the bolt 7 is unlikely to loosen.

FIGS. 3 and 4 show a second embodiment of this invention, in which the opposite tip of the head 10 of the anti-slip bolt 9 is a square part 10a, and the side of the tip is a square pyramid part 10b. There is. In this embodiment, since the surface of the rectangular portion 10a serving as the rotation prevention surface is large, the rotation prevention effect is large.

5 and 6 show a third embodiment of this invention, in which the opposite tip of the head 12 of the anti-slip bolt 11 has two anti-rotation surfaces 12 which are brought into contact with the lugs 2a and 2b.
a, 12a and two vertical surfaces 12b, 12b perpendicular to the side surfaces of the lugs 2a, 2b. Parallel ridge line 12d
is formed.

The ridgeline 12d of the head 12 has the effect of preventing slippage when the vehicle body moves forward or backward, and
has the effect of increasing the resistance to skidding. Conventionally, skidding has been prevented by welding plates perpendicular to the lugs, but this invention eliminates the need for such plates.

In addition, although a triple grouser having three lugs on the track plate 2 has been described as an example, in the case of a double grouser having two lugs or a single grouser having one lug, the anti-rotation surface of the head of the anti-slip bolt Although the contact area with the lug is only one place, the same effects and effects as mentioned earlier can be expected.

(g) Effects of the invention As explained above, this invention provides the following effects.

(1) The anti-slip bolt can exert its anti-rotation effect when tightened.

(2) Since the anti-slip bolt and the lug of the track are restrained via the anti-rotation surface of the head of the anti-slip bolt, the bolt is unlikely to loosen even if a concentrated load is applied to the anti-slip bolt.

(3) In the case of the third embodiment, slipping is less likely to occur when moving forward or backward, and side slipping is also less likely to occur due to the vertical plane of the head.

[Brief explanation of the drawing]

Figure 1 is a bottom view showing the first embodiment of this invention;
Fig. 2 is a sectional front view of Fig. 1, Fig. 3 is a bottom view showing a second embodiment of this invention, Fig. 4 is a sectional front view of Fig. 3, and Fig. 5 is a third embodiment of this invention. A bottom view showing an example, FIG. 6 is a cross-sectional front view of FIG. 5, FIG. 7 is a side view showing the state of connection between the track link and the track shoes, and FIG. 8 is a bottom view of the track links shown in FIG. 7. Figure 9 is a bottom view of the track shoes with conventional anti-slip bolts installed, Figure 10
The figure is an enlarged cross-sectional view taken along line XX in FIG. 9.

Claims (1)

[Claims for Utility Model Registration] (1) An anti-slip bolt for a track shoe that has a head that projects from the lug of the shoe, where the opposite side of the head is in contact with the side surface of the lug. An anti-slip bolt characterized by having a rotation preventing surface. (2) A utility model registration claim (1) in which a vertical surface perpendicular to the side surface of the lug is formed on the side opposite to the tip of the head, and a ridge line parallel to the lug is formed on the tip of the head. Anti-slip bolt as described.