JPH0677781U - Bowling pin - Google Patents

Abstract

(57) [Summary] [Purpose] The body is made of wood and the outer surface is covered with a synthetic resin coating to prevent premature damage to the boring pin. [Structure] A peripheral groove of appropriate width and depth is provided around the maximum diameter part of the boring pin body made of wood, and an annular band made of synthetic resin is fitted into the peripheral groove, and at the center of the minimum diameter part. Provide a vertically long cavity, fit a synthetic resin mandrel into the cavity,
The outer surface is covered with a synthetic resin outer coating.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a boring pin whose main body is wood.

[0002]

[Prior art]

 Conventional boring pins are made of wood and have an outer surface coated with synthetic resin.

[0003]

[Problems to be solved by the device]

 When a ball hits a conventional boring pin, the synthetic resin jacket dents and the surface of the wood body also dents. At the maximum diameter of the bowling pin, this phenomenon is repeated each time the ball collides, and if the same location is repeatedly collided, the wood fibers will break and will not be restored, making it useless. Also, since the boring pin is repeatedly tumbled, the smallest diameter part is scratched and cracked. Therefore, the present invention aims to provide a bowling pin in which a portion of the bowling pin that is easily damaged at an early stage is reinforced so as to last longer.

[0004]

[Means for Solving the Problems]

 The boring pin according to the present invention is provided with a circumferential groove having an appropriate width around the maximum diameter portion of the wooden body, and an annular band made of synthetic resin is fitted into the circumferential groove, or the minimum diameter portion of the wooden body is fitted. A vertically long cavity is provided in the center of the core, a synthetic resin core is fitted into the cavity, and the outer surface is covered with a synthetic resin film.

The annulus and the cord are molded of synthetic resin such as polyamide, polyacetal, polypropylene and the like.

An adhesive is applied to the respective fitting surfaces of the annulus and the cord to fit and fix them.

[0007]

[Action]

 When the ball collides with the maximum diameter part of the bowling pin, the annulus also dents together with the outer cover, but when the ball separates it recovers and does not crack. Also, when the boring pin falls, the core of synthetic resin elastically bends in the smallest diameter portion, so it is difficult to break.

[0008]

【Example】

 Examples will be described with reference to the drawings. The main body 1 is made of wood, and a peripheral groove 2 having a width of about 80 mm is formed in the maximum diameter portion, and a cavity 3 having a diameter of about 10 mm and a length of about 80 mm is formed at the center of the minimum diameter portion. There is. Reference numeral 4 denotes a synthetic resin ring band, the width and inner diameter of which can fit tightly into the circumferential groove 2, and the fitting surface is coated with an adhesive so as to be fitted and fixed to the circumferential groove 2. Reference numeral 5 is a synthetic resin material which has a size capable of being fitted tightly in the cavity 3 and which is fitted in the cavity 3 by applying an adhesive to the fitting surface. The ring 4 or the cord 5 is fitted, or the body fitted with both is coated with a synthetic resin on the outer surface in the same manner as in the conventional case, or is injection-molded to form a coating 6.

The circumferential groove 2 preferably has a width of about 80 to 30 mm and a depth on both sides of about 10 to 0 mm.

When the thickness of both side edges of the annulus 4 is fitted in the circumferential groove 2, the annulus 4 may not be flush with the surface of the main body 1 and may protrude as shown in FIG. If necessary, a step of 0 to 1 m may be added.

The cross-sectional shape of the cavity 3 and the heart 5 may be circular or any other shape, and the length is preferably 80 to 50 mm and the thickness is preferably 12 to 8 mm. The main body 1 is made of laminated wood, but the cavity 3 is processed before laminating the wood.

[0012]

Effect of the Invention The impact resistance is remarkably increased, the crack at the maximum diameter portion or the breakage at the minimum diameter portion is significantly reduced, and the life of the boring pin is extended.

[Brief description of drawings]

FIG. 1 is a partially longitudinal side view.

FIG. 2 is a vertical cross-sectional side view of essential parts showing another embodiment of the annulus.

[Explanation of symbols]

 1 boring pin body 2 circumferential groove 3 cavity 4 ring 5 core 6 coating

Claims (2)

[Scope of utility model registration request] 1. A boring pin whose main body is made of wood and whose surface is covered with synthetic resin. An annular band of synthetic resin is fitted into a circumferential groove of an appropriate width provided in the maximum diameter portion of the main body, and the outer surface is made of synthetic resin. A boring pin characterized by being covered with a film. 2. In a boring pin whose main body is made of wood and whose surface is covered with synthetic resin, a synthetic resin core is fitted in a vertically long cavity provided at the center of the minimum diameter part of the main body, and the outer surface is made of synthetic resin. A boring pin characterized by being covered with a film.