JPS638513Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an entanglement prevention device that is installed in front of the rear wheels of a truck.

Vehicles such as trucks that have a large space in front of their rear wheels run the risk of trapping pedestrians, bicycles, motorcycles, etc. in their rear wheels when turning left or right.

Therefore, as an example is shown in a side view in FIG. A member 5 is provided so that even if a pedestrian, bicycle, etc. tries to get caught on the side when turning left, the entrapment prevention member 5 removes the pedestrian or bicycle and prevents an accident. (Refer to Utility Model Publication No. 47-7227).

In this case, as shown in an enlarged rear view of an example of the left-side entanglement prevention device in Fig. 2, the support stay 4 is attached to the wooden horizontal joist 3 using two mounting bolts 6, 6 on the left and right. and fix it.

The mounting structure using the mounting bolts 6 is as shown in the enlarged vertical side view in FIG.
A mounting bolt 6 is inserted from the support stay 4 side and tightened with a nut 11 using a flat washer 9 and a spring washer 10 on the opposite side of the wooden horizontal joist 3.

Since the horizontal joist 3 of the support stay 4 attached in this manner is made of wood, when it dries and shrinks, the tightening becomes loose and it wobbles.

Furthermore, in order to prevent rattling, a technical means is described in Japanese Utility Model Application Publication No. 49-83471, in which a wedge-shaped mounting piece is provided near the mounting hole.
Since the mounting piece does not constitute a flared annular projection, it is not possible to apply high tightening stress or restoring force to the joint portion of the mating member when it is fixed.

Furthermore, since the mounting piece does not have a flare shape formed concentrically with the mounting hole, and is provided in a portion that does not match the position of the hole of the mating member,
It cannot be pushed into the hole, and there is no effect of making positioning work extremely easy during installation.

Based on the above-mentioned viewpoint, the present invention aims to provide a truck entanglement prevention device that does not cause rattling in the support stay even if the wooden horizontal joist dries and shrinks. The gist is that a flared annular protrusion formed at the periphery of the attachment hole of the support stay of the entanglement prevention member is pushed into the hole of the wooden horizontal joist by the attachment bolt of the support stay.

Next, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 4 and 5, a support stay 4 that is fixed to a wooden horizontal joist 3 of a loading platform 2 has a mounting hole 7 at its periphery. A flared annular protrusion 12 having a radius of curvature R is formed by burring (flange up).

When fixing the support stay 4 having the annular protrusion 12 as described above to the wooden horizontal joist 3, first insert the support stay 4 into the hole 8 while pushing the annular protrusion 12 of the support stay 4 into the hole 8 of the horizontal joist 3. , and then insert the mounting bolt 6 through the flat washer 9 and then tighten it with the nut 11 through the flat washer 9 and the spring washer 10, so that the annular protrusion 12 conforms to its flared shape. The support stay 4 is firmly attached to the horizontal joist 3 by biting into the horizontal joist 3 while expanding the mouth end 3a of the hole 8 of the horizontal joist 3.

As described above, in the truck entrapment prevention device according to the present invention, the flared annular protrusion formed around the mounting hole of the support stay of the entrapment prevention member is pushed into the hole of the wooden horizontal joist by the mounting bolt of the support stay. Therefore, the tightening stress and compressibility are highest near the mouth end 3a of the hole 8 of the horizontal joist, which is pressed by the flared annular projection, and as a result, the wooden horizontal joist dries out. Even if it contracts (reduces the tightening torque), the mouth end area 3a will still strongly contact and be supported by the outer surface of the annular projection due to the high tightening stress and restoring force near the mouth end area. The stays and horizontal joists are firmly fixed, and no rattling occurs.

Further, an annular projection that bites into the horizontal joist is provided on the periphery of the mounting hole of the support stay, and as the mounting bolts are tightened, the annular projection bites sufficiently deeply into the vicinity of the mouth end of the hole 8 of the horizontal joist. The biting restricts the support stay from moving in the vertical and horizontal directions, so
Even if there is a difference in diameter between the mounting hole 7 of the support stay and the mounting bolt 6, vibrations, noise, etc. due to rattling or rattling will not occur. The combination of the high tightening stress and large restoring force near the mouth end of the hole of the horizontal joist and the restraining force against vertical and horizontal movement of the support stay due to the biting of the annular projection results in the line diagram shown in FIG. As indicated by the American mark inside, even with a tightening torque of 0.5 kg/m or more, it can withstand a lateral load of approximately 80 kg on the support stay (horizontal joist breaking load), which improves durability and reliability. This has the effect of providing an anti-entanglement device for certain trucks.

Furthermore, since a flared annular protrusion is formed on the support stay concentrically with its attachment hole 7, when attaching the support stay to the horizontal joist, the tip of the annular protrusion is first pushed into the hole 8 of the horizontal joist. This has the advantage that the positioning work of the support stay and the horizontal joists can be performed extremely easily.

[Brief explanation of the drawing]

Fig. 1 is a side view of a truck with an entanglement prevention device attached, Fig. 2 is a rear view of the conventional device, Fig. 3 is an enlarged vertical sectional view showing the support stay fixing structure of the conventional device, and Fig. 4 Figure 5 is a side view showing the upper part of the support stay with an annular protrusion in the device of the present invention, and Figure 6 shows the tightening torque and durable load when fixing the support stay. FIG. 2...Loading platform, 3...Wooden horizontal joist, 4...Support stay, 6...Mounting bolt, 7...Mounting hole, 8...
Hole, 11... Nut, 12... Annular projection.

Claims (1)

[Scope of utility model registration request] A truck entrapment prevention device comprising a flared annular protrusion formed on the periphery of a mounting hole of a support stay of an entrapment prevention member and pushed into a hole in a wooden horizontal joist by a mounting bolt of the support stay.