JPH01229705A - Load surface temperature-sensing retractable spike - Google Patents

Abstract

PURPOSE:To respectively prevent a tire from its slip and a road surface from its damage by embedding a cylinder in a tire in its grounded surface and inserting a spike pin being able to protrude and retract in accordance with an ambient temperature through a coil spring, consisting of a shape memory alloy, into the inside of the cylinder. CONSTITUTION:A cylinder 2 is vertically embedded in a tire 1 in its grounded surface 1a. A spike pin 4, integrally molded with a disk 3, is inserted into the inside of the cylinder 2 in a manner wherein the spike pin 4 protrudes and retracts from a hole 2a drilled in an end plate part of the cylinder 2. While a coil spring 5, consisting of a shape memory alloy, is provided to be arranged coming into contact with the disk 3 in the inside of the cylinder 2. Further the coil spring 5 fixes its both end parts respectively to the disk 3 and a bottom wall 2b of the cylinder 2. In this way, the coil spring 5 is extended sensing a low temperature on a running road surface when it is placed in a snow falling and freezing condition, then the spike pin 4 is protruded from the hole 2a of the cylinder 2, preventing the tire 1 from its slip.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to spikes embedded in the road contact surface of an automobile tire to prevent slipping when the road surface is frozen or covered with snow.

[Conventional technology] Conventional spike pins embedded in the road contact surface of tires are
When embedded in the tire, the spike pins always stick out, and when the road surface is frozen or snowy, the spike pins pierce the ice or snow to prevent slipping, but under normal conditions, the spike pins stick out from the road surface. There is a problem that it damages the equipment and generates dust, which pollutes the environment.

[Problems to be Solved by the Invention] An object of the present invention is to provide a spike pin that solves the above problems and does not damage the road surface or pollute the environment.

[Means to solve the problem] This will be explained with reference to the drawings.

In order to achieve the above object, the road surface temperature sensitive removable spike of the present invention has a hole 2a drilled in the end plate portion of the cylinder 2 on the peripheral side of the tire 1, which is embedded perpendicularly into the road contact surface 1a of the tire 1. A spike pin 4 integrally molded with a disk 3 having a diameter larger than the diameter of the cylinder 2a and smaller than the diameter of the cylinder 2 is inserted so as to be removable from the inside of the cylinder 2.
A coil spring 5 made of a shape memory alloy that reversibly expands and contracts depending on temperature is provided in contact with the disk 3 in the cylinder 2, and a bottom cover 2b is attached, and both ends of the coil spring 5 are attached to the disk 3 and the bottom cover 2b. It is something that

[Function] The road surface temperature sensitive removable spike configured as described above transmits the temperature to the shape memory alloy coil spring 5 when the cylinder 2 comes into contact with the road surface.

When the road surface is frozen or snowy, the shape memory alloy coil spring 5 expands (or contracts) in response to this, and the spike pin 4 is pushed out from the cylinder 2a, thereby preventing the tire 1 from slipping. On the other hand, when the temperature of the road surface rises and becomes higher than the freezing point, the shape memory alloy coil spring 5 contracts (or expands) in response.
By doing so, the spike pin 4 is drawn into the cylinder 2.

[Example] l is a tire, 1a is its road contact surface, 2 is a cylinder embedded vertically in the road contact surface 1a, 2a is a hole made in the end plate of the cylinder 2 on the side around the tire 1, 3 is a hole A disk inserted into the cylinder 2, 4 a spike pin integrally molded with the disk 3 and inserted into the hole 2a from inside the cylinder 2 so as to be removable, and 5 a spike pin provided inside the cylinder 2 in contact with the disk 3, which is reversible depending on the temperature. This is a shape memory alloy coil spring that expands and contracts. Note that 2b is a bottom cover attached to the center side end of the tire 1 of the cylinder 2, and the bent portions at both ends of the coil spring 5 made of a shape memory alloy are connected to the diametrical direction provided at each boss portion of the disk 3 and the bottom cover 2b. It is fitted into a small hole.

Next, the effect will be explained. When the cylinder 2 comes into contact with the road surface, it transmits its temperature to the shape memory alloy coil spring 5. When the road surface is frozen or snowy, the shape memory alloy coil spring 5 expands in response to the temperature. As a result, the spike pin 4 is pushed out from the cylinder 2a and pierces the ice/snow to prevent the tire l from slipping. Conversely, when the temperature of the road surface rises and becomes higher than the freezing point, the shape memory alloy coil spring 5 contracts in response. Since the spike pin 4 is thereby drawn into the cylinder 2, it does not damage the road surface or generate dust to pollute the environment.

Furthermore, depending on the position of the shape memory alloy coil spring 5 within the cylinder 2 and its configuration, it is possible to perform the same function as a spike pin even if the expansion and contraction due to temperature of the shape memory alloy coil spring 5 is reversed. The present invention is not limited to the above configuration. In addition, a bottomed hole 4a is provided in the spike pin 4 as required, so that the temperature of the road surface can be easily transmitted to the coil spring 5.

In the illustrated embodiment, instead of providing hook holes at both ends of the coil spring 5, both ends of the coil spring 5 may be welded to the disk 3 and the bottom cover 2b.

[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

Although the configuration is extremely simple, the spike pins 4 move in and out of the tire 1 road contact surface la in response to the temperature of the road surface, and when the road surface is frozen or snowy, the spike pins 4 function to prevent slipping and When the road surface is in a normal condition, the spike pin 4 is retracted into the cylinder 2 and becomes a normal tire, which does not damage the road surface and can meet the practical demands of areas suffering from road surface damage and dust pollution. .

[Brief explanation of the drawing]

Figures 1 and 2 are sectional views showing the spike pin of the embodiment of the present invention in its pushed out and retracted states, Figure 3 is a front view showing its outer shape, and Figure 4 is a plane view of the coil spring. It is a diagram. 1 Tire 1a Road contact surface 2 Cylinder 2a hole 2b Bottom cover 3 Disk 4 Spike pin 5 Shape memory alloy coil spring

Claims (1)

[Claims] 1. In the hole (2a) drilled in the end plate on the peripheral side of the tire (1) of the cylinder (2) to be embedded vertically into the road contact surface (1a) of the tire (1), insert a hole (2a) that is larger than the diameter of the hole (2a). A spike pin (4), which is integrally molded with a disk 3 having a diameter smaller than that of the cylinder (2), is inserted so that it can go in and out from inside the cylinder (2), and a shape memory alloy that reversibly expands and contracts depending on the temperature is inserted. A coil spring (5) is provided in contact with the disk (3) inside the cylinder (2), and a bottom cover (2) is provided.
A road surface temperature sensitive removable spike comprising a coil spring (5) attached to the disc (3) and a bottom cover (2b).