JPH0191877A - Gate ball stick - Google Patents

Abstract

PURPOSE: To prevent a shaft from being loosened during use by forming a recessed or projecting lower rotation stop part on the upper face of a head, making the axial center of a bolt, which is attached to the base end part of the shaft and screwed into the head, coincident with the axial center of the shaft, rotating and screwing the bolt into the head independently of the shaft. CONSTITUTION: A through hole 4 enough for vertically moving a head part 3A of a bolt 3 is formed at a base end part 2 of a shaft 1, the head part 3A of the bolt 3 is positioned inside this through hole 4, and a male screw part 3B is screwed into a female screw part 5 formed at the base end part 2 and protrudes its lower end part from the bottom face of the base end part 2. A lower recessed rotation stop part 7 is formed on the upper face of a head 6, and an upper projecting rotation stop part 8 to be fitted with the lower rotation stop part 7 is formed at the base end part 2 of the shaft 1 corresponding to this lower rotation stop part 7. A whole section from the bottom face of the base end part 2 of the shaft 1 to prescribed height is formed at the upper rotation stop part 8 (the section shown by cross hatching in the figure). Concerning the female screw part 9 for screwing the male screw part 3B of the bolt 3, it is enough only to bury a nut in the head 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gateball stick, and more particularly to a gateball stick with an improved structure in which the base end of the shaft is screwed into the head.

[Conventional technology]

The gateball stick has a shaft 100 connected in the middle and can be disassembled into two pieces when not in use, and the base end of the shaft 100 has a wooden cylindrical head 101.
It was designed to be able to be removed when not in use. The shaft 100 and the head 101 are attached to each other by the shaft 10.
Generally, the base end of the head 101 was screwed into the head 101. That is, as shown in FIG.
Attach it to the bottom of the proximal end of the stick 100, and tighten the nut 10.
3 was embedded in the head 101, the washer 104 was fitted into the circular groove 105, and the bolt 1o2 was screwed into the nut 103.

[Problem to be solved]

In conventional gateball sticks, when the ball is hit with the head 101, the threading between the bolt 102 and the nut 103 becomes loose, and there is a risk that the shaft 100 may come off from the head 101 during use.

Therefore, an object of the present invention is to provide a gateball stick that has a simple structure and prevents the shaft from becoming loose.

[Means for solving problems]

In order to achieve the above object, the present invention provides a gateball stick in which the base end of the shaft is screwed into the head, in which a concave or convex lower rotation stopper is formed on the upper surface of the head, and a lower rotation stopper is formed on the base end of the shaft. Forms a convex or concave upper rotation stopper that fits with the rotation stopper, aligns the axis of the bolt attached to the base end of the shaft and screwed into the head with the axis of the shaft, and makes the bolt independent of the shaft. It was designed so that it could be rotated and screwed into the head.

[Effect]

Even if there is a bolt on the axis of the shaft, even if a rotational force acts on the shaft in the direction of loosening the screw during use, such rotational force will be prevented by the engagement of the upper and lower rotation stoppers. be done.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a through hole 4 is formed in the base end 2 of the shaft 1, through which the head 3A of the bolt 3 moves up and down, and the head 3A of the bolt 3 is positioned within the through hole 4. bolt 3
The male threaded portion 3B is screwed into the female threaded portion 5 formed on the base end 2 of the shaft 1, with its lower end protruding from the bottom surface of the base end 2.

A concave lower rotation stopper 7 is formed on the upper surface of the head 6. In contrast to the concave lower rotation stopper 7, a convex upper rotation stopper 8 is formed on the base end 2 of the shaft 1 to fit into the lower rotation stopper. In the embodiment shown in FIG. 1, it is desired to form the entire portion from the bottom surface of the base end portion 2 of the shaft 1 to a predetermined height as the upper rotation stopper portion 8 (the portion shown by cross-hunting in FIG. 1). As for the female thread part 9 into which the male thread part 3B of the bolt 3 is screwed, a nut may be embedded in the head 6 as in the conventional case. The upper rotation stopper 8 and the lower rotation stopper 7 in this first embodiment are shown in FIGS.
As shown in the figure, the shape may be any shape that prevents rotation of the shaft 1, and is not limited to the shape shown (elongated hole shape), but may be rectangular, square, triangular, or even oval.

To attach the shaft 1 configured in this way to the head 6, the upper rotation stopper 8 of the base end 2 is fitted into the lower rotation stopper 7 of the head 6. In this fitted state, the head 38 of the bolt 3 is located at the upper part of the through hole 4,
The tip of the male screw portion 3B is set in a state before being screwed into the female screw portion 9. Next, the head 3A of the bolt 3 may be rotated to screw the male threaded portion 3B into the female threaded portion 9. Alternatively, while rotating the head 3A and screwing the male screw portion 3B into the female screw portion 9, the upper rotation stopper portion 8 may be fitted into the lower rotation stopper portion 7 according to the screwing depth. Such a method has the advantage that the through hole 4 does not need to be enlarged.

In the second embodiment shown in FIG. 4, a convex rotation stopper 7' is formed on the upper surface of the head 6, and a concave upper rotation stopper 7' is formed on the base end 2 of the shaft 1 to fit with the lower rotation stopper 7'. A stop portion 8' is formed.

The illustrated shapes of the upper rotation stopper part 8.8' and the lower rotation stopper part 7.7' are just examples, and either of them may be convex or concave, and rotation of the shaft 1 is prevented by fitting the concave and convex portions. It is fine as long as it is suitable.

〔effect〕

As explained above, according to the present invention, a concave or convex lower rotation stopper is formed on the upper surface of the head, and the axis of the bolt attached to the base end of the shaft and screwed into the head is aligned with the axis of the shaft. In addition, the bolt rotates independently of the shaft and is screwed into the head, so even if the axis of the bolt coincides with the axis of the shaft, the upper and lower rotation stoppers will not fit together. This eliminates the risk of the shaft loosening during use.

[Brief explanation of the drawing]

Fig. 1 shows a first embodiment of the present invention, and is a front view of the head in cross section, Fig. 2 is a sectional view taken along line n--n in Fig. 1, Fig. 3 is a top view of the head, and Fig. 4 is a cross-sectional view of the head. This embodiment is a front view of the head in cross section, and FIG. 5 is a front view of a conventional example. 1...Shaft, 2...Base end, 3...Bolt, 6...Head, 7.7'...Lower rotation Stop part, 8.8'...
... Upper rotation stopper part, 9... Female screw part. Applicant Brideston Co., Ltd. Agent Patent Attorney Masu 1) Takeo Figure 1

Claims (1)

[Claims] 1. In a gateball stick in which the base end of the shaft is screwed into the head, a concave or convex lower rotation stopper is formed on the upper surface of the head, and a lower rotation stopper is formed on the base end of the shaft. A fitting convex or concave upper rotation stopper is formed so that the axis of the bolt attached to the base end of the shaft and screwed into the head coincides with the axis of the shaft, and the bolt rotates independently of the shaft. A gateball stick characterized in that it is configured to be screwed into a head.