JP3076704U - Telescopic connecting shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high tightening torque for a weak woman or an elderly person to lock a shaft with a stable fixing force in a telescopic connecting shaft having a structure in which a shaft is rotated around a shaft to tighten and lock. I do. A non-slip portion (8) is formed by spraying ceramics or metal such as SUS on the surfaces of shafts (2, 3, 4) in each stage.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an extendable connecting shaft constituted by connecting a plurality of shafts slidably in a telescopic manner.

[0002]

[Prior art]

 In recent years, telescopic connecting shafts have been widely used as sports equipment such as trekking and ski poles, or walking aids for the disabled and elderly.

FIG. 3 shows an example of the telescopic connecting shaft. Here, an example is shown in which a telescopic connecting shaft is used as a walking auxiliary walking stick for trekking. The telescopic connecting shaft 1 in this example is constructed by connecting three stages of hollow pipe-shaped shafts 2, 3, and 4 slidably in a telescopic manner, that is, the middle shaft 3 is connected to the upper shaft 2 by the middle shaft 3. The lower shaft 4 is inserted into the shaft 3 so as to be freely slidable in the axial direction, and the entire length is expanded and contracted by sliding the shaft between the respective stages.

The shafts 2, 3, and 4 of each stage are made of light metal such as aluminum. A resin grip 6 with a strap 5 is attached to an upper end of the upper shaft 2, and a lower end of the lower shaft 4. A rubber stick 7 is attached. When walking, the grip 6 is held by hand and the rubber stick 7 is pressed against the ground to use the shaft as a stick.

[0005] A friction lock mechanism that locks the slide of the shaft by frictional force is built in between the shafts of each stage in the telescopic connection shaft 1. This friction lock mechanism has a structure in which an internal tightening member is operated by rotating the shaft, and the axial force is increased by increasing the frictional force. In this example, the middle shaft 3 is connected to the upper shaft 2. By rotating the shaft and rotating the lower shaft 4 with respect to the middle shaft 3, each shaft is locked so as not to slide in the axial direction, and the entire shaft can be fixed at an arbitrary length.

[0006]

[Problems to be solved by the invention]

 In such a telescopic connecting shaft, the relationship between the tightening torque and the static friction force (the value of the axial force that causes slippage) is a condition for ease of tightening, but a high tightening torque should be applied especially to non-powered women and the elderly. At present, it is difficult to obtain stable and satisfactory fixing force.

At present, as a countermeasure, there is a method in which the shaft surface is scratched in a line shape by mechanical polishing or the like as a non-slip so as to easily tighten the shaft. There is a problem of bad.

[0008] The present invention has been made to solve such a problem.

[0009]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, the present invention is configured by connecting a plurality of stages of shafts so as to be freely slidable in a telescopic manner, and between the shafts of each stage, the internal tightening parts are operated by rotating the shafts of the shafts. In a telescopic connecting shaft having a built-in friction lock mechanism for locking the shaft, a non-slip portion is formed by spraying ceramics or metal on the surface of each stage shaft.

[0010]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an example in which a telescopic connecting shaft according to the present invention is applied to a walking auxiliary walking stick, and FIG. 2 is an enlarged view of a main part thereof.

The basic configuration of the telescopic connecting shaft of this embodiment is the same as that of the conventional example shown in FIG. In other words, the telescopic connecting shaft 1 is constructed by connecting the three-stage hollow pipe-shaped shafts 2, 3, and 4 so as to be slidable in a telescopic manner, that is, the middle shaft 3 is replaced with the middle shaft 3 with respect to the upper shaft 2. On the other hand, the lower shafts 4 are each fitted so as to be freely slidable in the axial direction, and the entire length is expanded and contracted by sliding the shafts between the respective stages.

The shafts 2, 3, and 4 of each stage are made of light metal such as aluminum. A resin grip 6 with a strap 5 is attached to an upper end of the upper shaft 2, and a lower end of the shaft 4 of the lower stage. A rubber stick 7 is attached. When walking, the grip 6 is held by hand and the rubber stick 7 is pressed against the ground to use the shaft as a stick.

In the telescopic connecting shaft 1, a friction lock mechanism that locks the slide of the shaft by a frictional force is built in between the shafts of each stage. This friction lock mechanism has a structure in which an internal tightening member is operated by rotating the shaft, and the axial force is increased by increasing the frictional force. In this example, the middle shaft 3 is connected to the upper shaft 2. By rotating the shaft and rotating the lower shaft 4 with respect to the middle shaft 3, each shaft is locked so as not to slide in the axial direction, and the entire shaft can be fixed at an arbitrary length.

In the telescopic connecting shaft 1 configured as described above, in particular, in the present invention, a non-slip portion 8 is formed by spraying on the surfaces of the shafts 2, 3, and 4 of each stage. This is a method in which a powder of ceramics or metal such as SUS is sprayed on the surface of the shaft by a thermal spraying technique to form a rough surface non-slip portion (sprayed portion) 8. When locking the shaft, the non-slip portion is used. And rotate the shaft to tighten it.

In the tightening of the shaft, a sufficient frictional force is obtained between the anti-slip portion and the hand, so that even a non-powered woman or an elderly person can output a high tightening torque, and a stable and satisfactory fixing force can be obtained. Can lock the shaft.

In particular, in this telescopic connecting shaft, ceramics or metal spraying is used as a method of forming the non-slip portion 8, so that the process of forming the non-slip portion 8 requires more labor than conventional mechanical polishing. It is excellent in terms of productivity.

Further, in this telescopic connecting shaft, the non-slip portion 8 sprayed with ceramics or metal serves to protect the surface of the shaft, so that the shaft surface is effectively prevented from being scratched or scratched. Can be prevented.

Although the embodiment of the present invention has been described above, the present invention is not limited to the walking aid for trekking as exemplified above, but can be widely applied to various other uses. Needless to say.

[0019]

[Effect of the invention]

 As described above, in the present invention, a non-slip portion is formed by spraying ceramics or metal on the surface of each stage shaft in a telescopic connection shaft having a structure in which the shaft is rotated by rotating the shaft and tightened and locked. As a result, even a weak woman or an elderly person can generate a high tightening torque, and the shaft can be locked with a stable fixing force.

Particularly, in the present invention, high productivity can be obtained by using thermal spraying of ceramics or metal as a method of forming the non-slip portion.

Further, in the present invention, since the surface of the shaft is protected by the non-slip portion formed by thermal spraying of ceramics or metal, there is an effect that the shaft surface can be prevented from being scratched or abraded.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a telescopic connecting shaft according to the present invention.

FIG. 2 is an enlarged view of a main part of the same.

FIG. 3 is a side view showing a conventional example of a telescopic connecting shaft.

[Explanation of symbols]

1 ‥‥ telescopic connecting shaft, 2 ‥‥ shaft (upper),
3 ‥‥ shaft (middle), 4 ‥‥ shaft (lower), 8
止 め Non-slip part (sprayed part)

Claims (1)

[Utility model registration claims] A friction lock mechanism comprising a plurality of stages of shafts slidably connected to each other in a telescopic manner, and between the shafts of the respective stages, an internal tightening part is operated by rotation of the shafts to lock the shafts. A telescopic connecting shaft, wherein a non-slip portion is formed by spraying ceramics or metal on the surface of each stage shaft.