JPS6241674A - Weight balance control apparatus of golf club head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises an outer cylinder fixed to a hole drilled in the bottom of a club head body and having an internal thread, and an inner member for a weight screwed onto the outer cylinder. The present invention relates to a weight balance adjustment device for a golf club.

This type of weight balance adjustment device for a golf club head is known from Japanese Utility Model Application Publication No. 59-44465, and has 10 weight types by inserting various lead weights into the hollow space of the inner member. Inner members are prepared in advance, and the user can select an inner member with a desired weight balance from among the inner members. However, the fit between the outer cylinder and the hole in the club head body is very tight to prevent the inner member from turning when screwed in, so inserting the outer cylinder into the hole is very difficult. It was difficult.

It is also possible to cut a thread into the outer periphery of the outer cylinder and the hole in the club head and screw it into the hole, but this increases the number of machining steps, which is undesirable.

An object of the present invention is to provide a golf club head which eliminates the above-mentioned drawbacks and is structured so that the outer cylinder can be easily inserted into the hole of the club head and can be securely fixed in the hole of the club head. An object of the present invention is to provide a weight balance adjustment device.

In order to achieve the above object, according to the present invention, the outer circumference of the outer cylinder is tapered so as to taper toward the bottom of the hole in the club head body, and the outer circumference is formed to be tapered toward the bottom of the hole in the club head body. A plate made of an elastic material may be fitted by a snap action.

Still, in the present invention, inner members of several different weights are prepared in advance by cutting out various amounts from the inside of the inner member for the weight to be screwed onto the outer cylinder. This allows the user to use the inner member itself as a weight and select an appropriate weight balance that suits him/her.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a golf club spatula having a golf club weight balance adjustment device according to the present invention. 1 is a club head body, and 2 is a sole plate.

The weight balance adjustment device essentially includes an outer cylinder 10 fixed to the hole 1a of the club head body 1, and an inner member 20 serving as a weight screwed onto the outer cylinder 10.

In FIG. 2, the outer cylinder 10 has a female thread 12 formed on the inner periphery of a cylindrical main body 11, and a reduced part 13 is provided at one end of the main body 11, and this reduced part 13 is connected to the sole plate. It fits into the hole drilled in 2.

An annular protrusion 14 is formed on the outside of the outer cylinder 10 adjacent to the reduced portion 13, and the outer peripheral surface of the protrusion 14 is knurled to prevent rotation.

According to the present invention, the outer peripheral surface of the main body 11 of the outer cylinder 10 is formed into a chill bar 15 that tapers toward the bottom of the hole 1a of the club head main body, and the side opposite to the reduced part 13 of the outer cylinder main body 11 A disk 1G of elastic material (for example, Black Fiber (trade name) used for packing) is fitted from the outside between the threads of the female screw 12 by a snap action. Therefore, at this time, the elastic disk 16 is convex toward the inside of the outer cylinder 10, as shown in FIG.

On the other hand, a weight inner member 20 screwed into this outer cylinder 10
In accordance with the present invention, several different weights of inner members can be made to serve as weights by varying the amount removed from their interior. 4, 5, and 6 show inner members 20, 20;'20" of three different weights. For example, from the maximum weight of the solid inner member 20" in FIG. It is possible to make inner members of 10 weight types in increments of 1.5 g up to the minimum weight of the inner member 20 with the deepest excised space. Therefore, the user can finely select the appropriate weight balance that suits him/her over a wide range. Further, there is an advantage that there is no need for a lead weight in addition to the inner member 20 as in the conventional case, and the number of parts is reduced.

Each inner member 20 has a main body 2 having a male thread 21 on its outer periphery.
2, and a head 23 formed integrally with the main body.

A tapered portion 24 is formed on the outer periphery of the end of the head 23 of the inner member 20, and a tapered portion 17 corresponding to the tapered portion 24 is also formed on the inner end periphery of the reduced portion 13 of the outer cylinder 10. , when the inner member 20 is screwed into the outer cylinder, the taper part 1
It is preferable that 7 and 24 come into contact with each other to complete the tightening. Note that the head 23 of the inner member 20 is provided with a groove 25 into which a screwdriver or a coin can be inserted.

During assembly, the elastic plate 16 is snapped into place between the threads of the screw 12 at the tip of the outer tube 10 (FIG. 2). Then, the outer cylinder 10 is fitted into the hole of the sole plate 2, and the outer circumference of the main body 11 of the outer cylinder and the elastic plate 1 are
After applying adhesive 18 to the outer surface of the club head body 1, the sole plate 2 is inserted into the hole 1a made in the bottom of the club head body 1, and at the same time, the sole plate 2 is adhered to the bottom surface of the club head body 1 and fixed with screws. Then, when the elastic plate 16 of the outer cylinder 10 is pressed from the inside (FIG. 3), the adhesive 18 between the elastic plate 16 and the bottom of the hole 1a of the club head body is bonded to the taper 15 of the outer cylinder 10 and the hole 1a. The tapered surface 15 and the hole 1a are firmly bonded and fixed by being pushed into the gap between the inner peripheral surfaces. Then, an inner member of a desired weight may be screwed into the outer cylinder 10. As a rotation stopper to prevent the outer cylinder 10 from rotating when the inner member 20 is screwed in, not only the adhesive 18 between the hole A and the outer surface of the outer cylinder 10 but also the knurling of the annular protrusion 14 of the outer cylinder 10 are used. Masks are also helpful.

In the present invention, the outer circumferential surface of the outer cylinder is tapered toward the bottom of the hole in the club head body, making it very easy to insert the outer cylinder into the hole in the club head. At the same time, a plate of elastic material was fitted from the outside between the threads of the female thread at the tip of the outer cylinder by a snap action.
After inserting the outer cylinder into the club head hole, the inwardly convex plate of elastic material is pressed outward to create an adhesive between the outer cylinder's elastic plate and the bottom of the club head hole. The outer cylinder can be reliably fixed to the hole of the club head by pushing the outer cylinder into the gap between the outer peripheral tapered surface of the outer cylinder and the inner peripheral surface of the hole.

Furthermore, in the present invention, inner members of several different weights can be prepared by cutting out various parts of the inside of the inner member that is screwed into the outer cylinder, and these inner members themselves can be used as a weight. This method has the advantage of not only eliminating the troublesome work of inserting lead into the inner member and fixing it therein, but also reducing the number of parts.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a golf club head having the weight balance adjustment device of the present invention, and Fig. 2 is a partial sectional view showing the outer cylinder and elastic plate coated with adhesive and inserted into the hole of the club head. , Fig. 3 is a partial sectional view showing the inner weight member screwed into the outer cylinder after pressing the elastic plate from inside, Fig. 4 is a longitudinal sectional view of the lightest inner weight, and Fig. 5 is the middle one. Fig. 6 is a vertical cross-sectional view of the heaviest inner weight. 1e... Club head body 1a... Hole of club head body

Claims (2)

[Claims] (1) A golf club head that has an outer cylinder that is fixed to a hole drilled in the bottom of the club head body and has a female thread inside, and an inner member for a weight that is screwed onto the female thread of the outer cylinder. In the weight balance adjustment device, the outer circumference of the outer cylinder is tapered toward the bottom of the hole in the club head body, and a plate of elastic material is provided between the threads of the female thread at the tip of the outer cylinder. A device characterized by being fitted with a snap action. (2) A golf club head that has an outer cylinder that is fixed to a hole drilled in the bottom of the club head body and has an internal thread, and an inner member for a weight that is screwed onto the female thread of the outer cylinder. A weight balance adjustment device, characterized in that inner members of several different weights are prepared in advance by cutting out various amounts from the inside of the inner member.