JPH031013Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention is a device that displays the axis of rotation (hereinafter referred to as the dynamic axis of rotation) in a dynamically balanced state on the surface of a golf ball whose center of gravity varies. Regarding.

<Prior art> In general, the center of gravity of a golf ball does not coincide with the center of gravity, and the degree of eccentricity varies depending on the ball. If you make a putt by replacing the ball with the ball, the ball will be distorted due to eccentricity. The optimal ball setting is to place the dynamic axis of rotation parallel to the ground and perpendicular to the direction of flight.
It is very useful for players if the dynamic axis of rotation is displayed on the surface of the ball.

As a device for displaying such a mark on the surface of a ball, US Pat. No. 4,546,644 discloses a device in which a writing instrument holder is rotatably attached to a housing equipped with a cup for receiving a golf ball and a motor that rotates the cup at high speed. The structure installed is shown. According to this, when the golf ball on the cup rotates at high speed and is in a state of motion balance, the user rotates the writing instrument holder in the horizontal direction and moves the tip of the writing instrument toward the equator of the golf ball that is rotating at high speed. It can be brought into contact with the top to draw an annular circle. The same specification also discloses that, in addition to the writing instrument holder, a writing instrument holding curved arm is rotatably attached to mark the apex of the golf ball through which the dynamic axis of rotation passes. .

<Problem that the invention aims to solve> Until the golf ball on the cup starts rotating and is in a state of motion, the golf ball moves quite a bit, and in some cases, it may fly in a direction that does not come off the cup. There are things to do. Also, if you draw a circular circle with the tip of the writing instrument after it is in a state of balance, you have to be very careful or you won't know where it will fly. Not only was this dangerous, but since there are two types of golf balls: a large size with a diameter of 42.67 mm and a small size with a diameter of 41.14 mm, the height of the writing instrument holder should originally be set in two ways. Although it should be done, there was a tendency for the structure to become complicated and sophisticated, making it too expensive.

This idea was created in view of the drawbacks of conventional products as mentioned above.
The purpose of this design is to easily display a mark that is safe and effective in identifying the desired dynamic rotation axis.

<Means for solving the problem> This invention consists of a cup for receiving golf balls,
It is the same as the conventional example in that it has a housing equipped with a motor that rotates it at high speed. However, a cap body having arm pieces that is hemispherical when viewed from the side and cross-shaped when viewed from above is detachably attached to the upper end of the housing to prevent accidents caused by flying balls. In addition, a guide hole is provided at a location where a line extending from the rotation axis of the cup and the motor intersects with the cap body, so that the passing point of the dynamic rotation axis can be easily displayed at the apex of the ball. Further, a guide groove extending along a straight line passing through the center of the guide hole is formed in the arm piece to facilitate drawing a line indicating a plane perpendicular to the dynamic rotation axis on the equator of the ball.

<Embodiment> The embodiment of this invention shown in the drawings will be described as follows.

The device shown in FIG. 1 is composed of a cylindrical housing 1 and a substantially hemispherical cap body 2 that fits around the upper edge of the housing 1. The housing 1 includes a cup 3 for receiving a golf ball.
and a motor 4 for its rotation, as well as a motor drive circuit including a battery 5 and a switch 6, and
A writing instrument storage hole 7 is formed in the outer surface of the housing 1 (see FIGS. 3 and 4). In cap body 2,
There are four arm pieces 8 that are hemispherical when viewed from the side and cross-shaped when viewed from the top, and a space sufficient for inserting a finger is formed between each arm piece 8. A guide hole 9 of an appropriate diameter is bored at the top of the cap body 2 that is correctly fitted into the housing 1, that is, at the intersection of the four arm pieces 8, at the point where the line extending from the rotation axis of the cup 3 and the motor 4 intersect. are doing. Guide grooves 10, 10 are respectively formed in two of the four arm pieces 8 arranged in a character shape so as to extend along a straight line passing through the center of the guide hole 9. The width of the guide groove 10 is smaller than the diameter of the guide hole 9.

Preferably, the cap body 2 is made of transparent synthetic resin so that the inside can be seen from the outside. As shown in FIGS. 1 and 2, a vertical reference line 1 that is orthogonal to the guide groove 10 is placed on the other arm piece 8 that does not have the guide groove 10.
1 should be engraved. More preferably,
A horizontal reference line 12 is carved in each position where the horizontal plane passing through the center of each ball on the cup 3 intersects the vertical reference line 11 when the ball is large size and small size.

Next, how to use this device will be explained.

When a golf ball is placed on the cup 3, the cap body 2 is attached, and the switch 6 is turned on to rotate the motor 4, the ball initially rotates with slight movement, but after about 15 seconds it reaches a stable state of movement. Therefore, insert a writing instrument into the guide hole 9 and mark the top of the ball. After marking is completed, switch 6 is turned off to stop driving motor 3. At this time, in order to quickly stop the ball, it is sufficient to grasp the ball with the finger inserted between the arm pieces 8, 8.
Next, looking from above the cap body 2, after confirming that the mark made on the ball matches the guide hole 9, pass through the plane that includes the guide groove 10 and the ball center, passing through the ball center located within the plane. Rotate 90° around the horizontal axis. This is done with a fingertip inserted between the arm pieces 8, 8. If a vertical reference line 11 is attached, turn it along it, and if a horizontal reference line 12 is attached, turn it until it matches there. After that, insert the writing instrument into the guide groove 1.
0 and draw a line on the equator of the ball.

<Effects of the invention> In this invention, the cap body 2, which has arm pieces 8 that are hemispherical when viewed from the side and cross-shaped when viewed from above, is detachably attached to the housing 1, so that the ball can fly unexpectedly. Even if something like this happens, you can protect yourself and there is no danger, and you can apply braking force to the ball by inserting your fingers between the arms 8 and 8, or press the ball on the cup 3 with your fingertips while the cap body 2 is attached. You can pinch it and turn it. In addition, since a guide hole 9 is provided in the cap body 2 at the point where the extension line of the rotation axis of the cup 3 and the motor 4 intersect, by inserting a writing instrument into the guide hole 9, the ball rotating at high speed will be placed on the dynamic rotation axis. A certain point can be easily displayed, and since a guide groove 10 is formed in the cap body 2 along a straight line passing through the center of the guide hole 9, the guide groove 1
After rotating the plane containing 0 and the center of the ball 90 degrees around a horizontal axis that passes through the center of the ball within the plane, a writing instrument is inserted into the guide hole 9, and a line can be drawn on the equator of the ball.

Note that when the cap body 2 is made of a transparent synthetic resin and the vertical reference line 11 which is perpendicular to the guide groove 10 is carved on the other arm piece 8 which does not have the guide groove 10, the ball is rotated at 90 degrees. When turning the ball, it is convenient because all you have to do is turn the mark on the top of the ball along the reference line 11, and the horizontal plane passing through the centers of the large and small balls on the cup 3 is When the horizontal reference line 12 is carved at a position intersecting the vertical reference line 11, it is easy to know how far to turn the mark placed on the apex of the ball, which simplifies the operation.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the dynamic rotation axis display device for a golf ball according to this invention, FIG. 2 is a top view thereof, and FIGS. 3 and 4 are side sectional views thereof. 1... Housing, 2... Cap body, 3... Cup, 4... Motor, 8... Arm piece, 9... Guide hole,
10... Guide groove, 11... Vertical reference line, 12...
horizontal reference line.

Claims (1)

[Claims for Utility Model Registration] 1. A cap body 2 having a hemispherical shape when viewed from the side and a cross-shaped arm piece 8 when viewed from above, a cup 3 for receiving a golf ball, and a cup 3 for receiving a golf ball; A rotating motor 4 is detachably installed at the upper end of the housing 1, and a guide hole 9 is bored at the location where the extension of the rotating shaft of the cup 3 and the motor 4 intersects with the cap body 2. A dynamic rotation axis display device for a golf ball, in which a guide groove 10 is formed in an arm piece 8 along a straight line passing through the center of the golf ball. 2 The cap body 2 is made of transparent synthetic resin, and the guide groove 10
The dynamic rotational axis display device for a golf ball according to claim 1, wherein a vertical reference line 11 perpendicular to the guide groove 10 is engraved on the other arm piece 8 which does not have a guide groove 10. 3. The golf ball drive according to claim 2 of the patented utility model registration, wherein the vertical reference line 11 is engraved with a horizontal reference line 12 at a position where a horizontal plane passing through the center of the golf ball on the cup 3 intersects. Rotation axis display device.