JP2679002B2 - Billiard cue joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a billiard cue joint.

[0002]

There are various types of joints,
A joint of a billiard cue that needs to be securely screwed in a short time, such as a billiard cue, is known in which a male screw and a female screw having the same screw diameter and screw pitch are screwed.

In such a billiard cue in which a male screw and a female screw are screwed together, two rods, a bat and a shaft, are screwed together, and a subtle vibration of the bat tip that strikes a ball passes through the shaft and the hand that grips the shaft. There are also known things that need to be communicated to.

[0004]

When it is desired to transmit a subtle vibration from the tip end through a joint like a billiard cue, it is necessary to strongly secure the screwed state. In order to strengthen the screwed state, it was necessary to lengthen the threaded portion or increase the number of threads.

Alternatively, it is necessary to double the screw portion.

However, in a game such as a billiard cue that requires frequent replacement of the bat and the shaft during the game, the length of the screw portion is increased in order to quickly and surely perform delicate screwing. There is a problem that it is difficult to increase the number of threads and it is quite difficult.

An object of the present invention is to obtain a billiard cue joint capable of performing a strong connection quickly in a short time.

[0008]

[Means for solving the problem] To achieve this object,
In a joint of billiard cues that has joints on the butt side and shaft side of the billiard cue and is screwed to each other, the joint on one side has a plurality of male thread parts with the same thread pitch and different thread diameters, The external thread has a screw diameter whose outside diameter on the tip side is smaller than the root diameter on the rear side.The external thread has a non-threaded portion between the external threads, and the external thread is provided in the center of the recess. The internal joint has a female screw recess with an internal thread formed on the inner wall, and the joint on the other side has a plurality of female screw parts with the same screw pitch and different thread diameters. The root diameter of the male thread is smaller than the inner diameter of the female thread on the inlet side, and consists of a female threaded body with a non-threaded section between the female threaded sections and a male threaded projection. Is characterized in that it is screwed with the female screw portion at the back end of the female screw body, the rear side male screw portion of the male screw body is screwed with the female screw portion on the inlet side of the female screw body, and the female screw concave portion and the male screw projecting portion are screwed together. We propose a billiard cue joint.

[0009]

When connecting the billiard cue joint, the male screw body on one side is inserted into the female screw body on the other side. Since the outer diameter of the male threaded portion on the tip side is smaller than the inner diameter of the female threaded portion on the inlet side, the male threaded portion on the tip side passes through to the end of the female threaded portion on the inlet side.

When the male screw portion on the tip end side reaches the female screw portion on the rear end side, at the same time, the male screw portion on the rear portion side reaches the female screw portion on the inlet side and is screwed by being relatively rotated. At this time, at the same time, the female screw concave portion on the male screw body side and the male screw protruding portion on the female screw body side are also screwed together.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings showing embodiments.

FIG. 1 shows an example of a joint of a billiard cue, which is a triple lock. The triple-lock billiard cue shown in FIG. 1 is provided with a protruding threaded portion on the butt 10 side, and is doubled in the longitudinal direction and double in the layer direction.
It is a joint with two screwing parts.

Reference numeral 10 is a butt side which is a tip end side of the billiard cue 3, and 11 is a shaft side which is a grip hand side of the billiard cue 3. The butt 10 side joint is provided with a female screw body 2, and the shaft 11 joint is provided with a male screw body 1.

The male screw body 1 is provided with two types of male screw parts 12a and 12b having different screw diameters, and a non-screw part 13 is provided between them. The outer diameter of the front male threaded portion 12a is smaller than the root diameter of the rear male threaded portion 12b, and the thread pitch is the same. In this embodiment, the number of threads of the male screw portions 12a and 12b and the length of the screw portion are the same, but the male screw portion 1
The length of the threaded portion 2b may be different.

The non-threaded portion 13 has a cylindrical shape with a smooth surface. The length of the non-screwed portion 13 may be appropriate, but the combined length of the tip end side male screw portion 12a of the male screw body 1 and the non-screwed portion 13 is the entrance side female screw portion 14b of the female screw body 2 described later.
The length may be the same as the total length of the non-threaded portion 15 of the female screw body 2.

The female screw body 2 is provided with two types of female screw portions 14a and 14b having different screw diameters, and a non-screw portion 15 is provided therebetween. The inner wall of the non-threaded portion 15 is a smooth wall. The inner diameter of the non-threaded portion 15 is larger than the outer diameter of the male threaded portion 12a.
The root diameter of the female screw portion 14a on the rear end side is equal to that of the female screw portion 1 on the inlet side.
The inner diameter of 4b is smaller than 9b, and the screw pitch is the same.
In this embodiment, the internal threaded portion 14a has a larger number of threads than the internal threaded portion 14b, and the threaded portion is formed longer, but the internal threaded portions 14a and 14b may have the same length.

The male screw portion 12a is screwed into the female screw portion 14a, and the male screw portion 12b is screwed into the female screw portion 14b.

The joint on the butt side 10 is provided with a male screw projecting portion 16 to be screwed into the female screw recess 17 of the shaft side 11 joint. The female screw recess 17 has a female screw formed on the inner wall thereof, and the male screw body 1 is provided at the center of the recess, and the male screw body 1 projects from the end surface of the shaft side 11.

When connecting the billiard cue joint of this embodiment, the male screw body 1 of the shaft side 11 joint is inserted into the female screw body 2. Male thread 1 on the tip side
Since the outer diameter of 2a is smaller than the inner diameter of the female screw portion 14b on the inlet side, the male screw portion 12a can pass through to the end of the female screw portion 14a. This is self-evident because the inner diameter of the female screw portion 14b is almost the same as the root diameter of the male screw portion 12b to be screwed.

When the front male screw portion 12a reaches the inner female screw portion 14a, the rear male screw portion 12b is
The female screw portion 12b on the entrance side is reached. Therefore, if they are relatively rotated, they will be screwed together. When the male screw body 1 and the female screw body 2 are completely screwed together, the female screw recess 1 of the shaft 11 is formed.
7 and the male screw protrusion 16 on the butt side 10 are also screwed together.

[0021]

Therefore, according to the present invention, when the joint of the billiard cue is connected, it can be performed in a short time of a fraction, and the length of the screwed portion is long and strong.
And you can make a delicate connection.

[Brief description of the drawings]

FIG. 1 is a front explanatory view of a connecting portion of an embodiment of a billiard cue.

[Explanation of symbols]

 1 Male Threaded Body 2 Female Threaded Body 3 Billiard Cue 10 Billiard Cue Bat 11 Billiard Cue Shaft 12a Tip Side Male Threaded Section 12b Rear Side Male Threaded Section 13 Male Threaded Non-Screwed Section 14a Inner End Side Female Threaded Section 14b Entry Side Female Threaded Section 15 Non-threaded part of female screw body 16 Male screw protrusion 17 Female screw recess

Claims (1)

(57) [Claims] 1. A billiard cue joint in which a butt side and a shaft side of a billiard cue are respectively screwed to each other, and a joint on one side has male screw portions having the same screw pitch and different screw diameters. The plurality of male screw parts have a screw diameter such that the outer diameter of the front end side male screw part is smaller than the root diameter of the rear part side male screw part, and a male screw body having a non-threaded portion between the male screw parts, and a male screw body. Is formed in the center of the recess and has an internal thread formed in the inner wall, and the joint on the other side has a plurality of female thread parts with the same thread pitch and different thread diameters. The depth of the root diameter of the female threaded portion on the back end side is smaller than the inner diameter of the female threaded portion on the inlet side, and it consists of a female threaded body with a non-threaded portion between the female threaded portions and a male threaded protrusion. The end side male screw part is screwed with the back end side female screw part of the female screw body, the rear side male screw part of the male screw body is screwed with the inlet side female screw part of the female screw body, and the female screw concave part and the male screw protruding part are screwed. Billiard cue joint characterized by matching.