JPH045081B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rail fastening dog nail for fastening a rail to a sleeper.

(Prior Art and its Problems) Conventionally, rail fastening dog nails (hereinafter referred to as dog nails) have been widely used to fasten rails to sleepers because of the ease of the rail fastening work.

However, most of the conventional dog nails are formed from a shaft portion and a head, and the rail is fixed to the sleeper by simply pressing the lower flange of the rail directly below with the head.

For this reason, the rail can be firmly fixed immediately after the dog nails are driven, but as train traffic increases, the rails vibrate and the dog nails begin to float.

As a result, conventional dog nails gradually come off due to the vibration of the rail, and due to the horizontal force of the train wheels in the direction perpendicular to the rail, the dog nails rotate to the outside of the rail, causing the head of the dog nail to fall out of the rail. It falls to the side, making it difficult to secure the gauge. Further, the horizontal force from the train wheels acts on the rail head, and this horizontal force acts as a frictional force between the railroad ties and the rail and a frictional force between the dognail head and the rail. Resistance to this horizontal force is due to the rotational resistance force of the portion of the dog nail shaft driven into the sleeper as well as to the rail floating force. However, this rotational resistance force was relatively weak, partly because the point of action was relatively high, and there were cases where the rails were insufficiently fastened.

In addition, in the case of concrete sleepers, pads are generally interposed between the rails and the sleepers, but the lifting of the dog nails can cause the rails to loosen and the pads to fall out.

In addition, elastic dog nails with elastic parts have been devised, but when dog nails elastically fasten rails, the rails are fastened by mounting springs, so the springs are unable to withstand the allowable pull-out force. In addition, the spring part had to have a large cross section, which resulted in an increase in manufacturing costs.

(Object of the invention) This invention was proposed in order to solve the above-mentioned conventional problems.
To provide a dog nail for rail fastening which can be fixed almost semi-permanently.

(Structure of the Invention) The dog nail for rail fastening according to the present invention has the head of the dog nail consisting of a shaft and a head diagonally so that the tip is in contact with the upper surface of the sleeper on the opposite side of the rail from the upper end of the shaft. a jaw portion that protrudes downward; and an arched portion that protrudes upward from the tip of the jaw portion toward the rail side in an arch shape, the tip portion of which abuts the lower flange of the rail, and has a predetermined elasticity. The above object is achieved by forming the arcuate portion from a metal plate and providing a stopper on the arcuate portion to prevent floating deformation exceeding a certain value.

(Embodiment) The present invention will now be described with reference to an illustrated embodiment. A dog nail 1 driven into a concrete sleeper A is integrally formed with a shaft portion 2 and a head portion 3, and its cross-sectional shape is as follows. It is formed in a square or rectangular cross section, and the side ends of the shaft portion 2 are sharply pointed.

The head 3 is formed from a jaw part 4 and an arcuate part 5.

The jaw portion 4 is formed to project diagonally downward from the upper end of the shaft portion 2 on the opposite side of the rail B, and its side end is connected to the concrete sleeper A by driving the dog nail 1 into the concrete sleeper A. It is in contact with the top surface of A.

The arcuate portion 5 is formed to protrude from the side end portion of the jaw portion 4 toward the rail B side, and the side end portion abuts on the lower flange C of the rail B to fix the lower flange C of the rail B. .

Further, the arcuate portion 5 is formed to bulge upward in an arcuate shape and has a certain degree of elasticity.

A stopper 6 is attached to the arcuate portion 5 to prevent the arcuate portion 5 from being deformed by more than a certain amount due to the floating vibration of the rail B.

The stopper 6 is formed from a metal plate into a substantially gate shape. It is placed over the tip of the arcuate portion 5, and the tip is fixed to the upper end of the shaft portion 2 by bolts or welding. Further, a certain gap is ensured between the bottom of the stopper 6 and the upper surface of the arcuate part 5, and as a result, the stopper 6
can be deformed by floating to a certain extent, and further deformation cannot be prevented by the stopper 6. That is, the floating vibration of the rail B can be absorbed by the floating deformation of the stopper 6 within a certain range.

FIG. 3 shows a stopper 6 made of a bolt. To attach the stopper 6, a loose hole 7 is formed in the arcuate portion 5, and a screw hole 8 is formed in the upper end of the shaft portion 2 corresponding to the loose hole 7, and the stopper 6 is attached to the screw hole 8. It is attached by screwing in from 7. The head of the stopper 6 prevents the arcuate portion 5 from floating above a certain level.

In such a configuration, floating of the rail B is prevented by the arcuate portion 5 of the head 3 of the dog nail 1.

In this case, the floating force of the rail B is transmitted to the concrete sleeper A at this part because the tip of the jaw part 4 of the dog nail 1 is in contact with the surface of the concrete sleeper A, and a large pulling force is generated on the shaft part 2. It doesn't work as it gets older.

Further, the lateral displacement of the rail B is prevented by the shaft portion 2 of the dog nail 1. Reference numeral 9 in the figure represents rubber, synthetic resin material, or wood.

This invention has the above-mentioned configuration, and according to the dog nail according to the present invention, the floating of the rail is received almost only by the arcuate portion of the dog nail, and the vibration of the rail floating is absorbed by the elasticity of the arcuate portion. Because it is designed to be able to do so, there is no need to worry about the dog nails coming off or becoming burnt due to the vibration of the rail. Also, you don't have to worry about the pads coming off. Therefore, the rail can be fixed almost semi-permanently on the sleeper.

[Brief explanation of drawings]

Figure 1 is a plan view showing how the rails are fastened;
The figure and FIG. 3 are enlarged cross-sectional views of the A section in FIG. 1. 1... Dog nail, 2... Shaft, 3... Head, 4...
Jaw part, 5... Arched part, 6... Stopper, 7...
... Loose hole, 8 ... Screw hole, 9 ... Rubber or synthetic resin material or wood, A ... Concrete sleeper, B ... Rail, C ... Lower flange.

Claims (1)

[Claims] 1 The head of a dog nail consisting of a shaft and a head is attached to the opposite side of the rail from the upper end of the shaft, with a jaw projecting diagonally downward so that the tip comes into contact with the upper surface of the sleeper, and from the tip of the jaw. It is formed from an arcuate part that bulges upward on the rail side and protrudes in an arcuate shape, the tip of which abuts the lower flange of the rail, and has a predetermined elasticity, and this arcuate part has a float of more than a certain value. A dog nail for fastening a rail, characterized by being provided with a stopper to prevent upward deformation.