JPS5861401A - Inspecting device for deviated barycenter of ball - Google Patents

Abstract

PURPOSE:To know whether the barycenter of a golf ball coincides with the spherical center or not easily and accurately by providing deviation indicating means which indicates a deviation with respect to a supporting member for a ball suspending frame which supports the ball suspending frame freely oscillatably. CONSTITUTION:A ball suspending frame 2 is supported freely oscillatably with respect to a supporting member 3 for the suspending frame around its fulcrum as the pointed shaft 6 stuck to the top end of the ball suspending frame by facing downward by supporting by a bearing 7 provided to the member 3. A deviation indicating body 5 consists of a fine metallic wire-like material which is provided at the bottom end of a ball rest 4. The free end of said body directs an indicating part 9 consisting of a cruciform wire 9a provided to the member 3 and a concentrical circle 9b centering at the point of intersection of said wire. The indicating body indicates the tilting state of the frame 2 cooperatively with the part 9. When a golf ball B is placed on the ball rest while the body 5 directs the center of the part 9, and if the ball has a deviated barycenter, the frame tilts in the direction where the barycenter of the ball moves near the vertical line. Where the barycenter of the frame 2 balances with the barycenter of the ball, said frame comes to a standstill, and therefore the deviated barycenter of the ball is known.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for testing the eccentric center of gravity of a spherical body, and more particularly to a device for determining whether the center of gravity of a golf ball or the like is aligned with the center of the ball.

It is desirable that the center of gravity of the golf ball coincides with the center of the ball. It is well known that the deviation of the center of gravity of the ball from the center of the ball, that is, the eccentric center of gravity of a single pole, has a subtle effect on the trajectory of the ball.

A ball with a large eccentric center of gravity puts weight on the hook and sliced ball muscles, and also makes the ball's movement and rolling unstable during putting.

Therefore, knowing the unbalanced center of the ball used by a golf player allows him to select a ball, thereby alleviating his sense of anxiety about playing and distrust of the ball.

An object of the present invention is to easily determine whether the center of gravity of a golf ball is aligned with the center of the ball, using an extremely simple method.
The object of the present invention is to provide a center of gravity tester that can accurately determine the center of gravity. and a bias display means for indicating the bias of the suspension frame with respect to the ball suspension frame support member.

The ball hanging frame has a point that is the center of swing of the hanging frame, and a ball that is located directly below the swing center point when the ball hanging frame is supported by the support member at the swing center point in an unloaded state. It has a receiver and a bias indicator that displays the inclination of the ball hanging frame with respect to the hanging frame support.

The above-mentioned no-load state refers to a state where no ball is placed on the ball receiver.

In an unloaded state, it is important to correctly position the ball receiver on the vertical line that includes the center of swing of the Poire suspension frame and below the center of swing in order to accurately determine the eccentric center of gravity of the ball. be. To check whether the ball holder is correctly positioned on the vertical line that includes the center of swing and the center of gravity of the entire ball hanging frame, place a reference sphere whose center of gravity matches the ball holder on the ball holder. You can know by.

If the ball receiver is correctly positioned 1d directly below the center of swing, even if an ideal ball with no eccentric center of gravity is placed on the ball receiver, the ball hanging frame will not tilt even slightly from its unloaded state. <1. On the other hand, when an eccentric ball with an eccentric center of gravity is placed on the ball receiver, the ball hanging frame tilts to a position where the center of gravity of the ball substantially coincides with a vertical line that includes the swinging center point of the ball hanging frame. The inclination of the ball hanging frame at this time can be known from the bias display.

Strictly speaking, when an eccentric ball is placed on the boffle receiver, the line connecting the ball's center of gravity and the center of swing of the ball hanging frame is not vertical. This is because the ball hanging frame itself also has a center of gravity. Therefore, in order to display the eccentric center of gravity as faithfully as possible, it is desirable that the ball hanging frame be made of as light a material as possible, such as aluminum or other light metal, or plastic. However, what is important is that the ball suspension frame and the suspension frame support member have sufficient rigidity to prevent deformation due to the weight of the ball.

Depending on the orientation of the ball placed on the ball receiver, it may not be displayed even though the ball has an eccentric center of gravity. In other words, if the ball is accidentally placed on the ball receiver so that the center of gravity of the ball is located on the vertical line that includes the center of swing (directly above or below the center of the ball), even if the ball has an eccentric center of gravity, No tilting of the ball hanging frame will occur. Therefore, when measuring the eccentric center of gravity, it is necessary to rotate the ball from the initial position placed on the ball receiver in the direction of qrf' so that the upper end of the ball is facing sideways, and then measure again. There is. Alternatively, by appropriately changing the orientation of the ball and measuring its consistency, it is possible to find out the approximate size of the eccentric center of gravity at or near the maximum.

The present invention will be explained below with reference to illustrated embodiments.

The ball eccentric center of gravity tester, designated as a whole by reference numeral 1, includes a ring-shaped ball hanging frame 2, a hanging frame support member 6 that swingably supports the ball hanging frame 2, and a lower part of the ball hanging frame 2. It mainly consists of a ball receiver 4 and a bias display 5 for displaying the inclination of the ball hanging frame 2.

The ball hanging frame 2 has a tapered tape 6 fixed downwardly at its upper end.
is provided on the suspension frame support member 6 and supported by a bearing 7, so that it is supported so as to be able to freely swing relative to the suspension frame support member 3 about the fulcrum. Ball hanging frame 2
In order to prevent the ball hanging frame 2 from moving uncontrollably, the upper part of the ball hanging frame 2 is loosely held between a pair of forks 6a formed at both ends of the upper end of the hanging frame support member 3.

As shown in FIG. 2, the ball receiver 4 fits the lower ends 2a + 2b of the ball hanging frame 2 into slots bored on both sides of the ball receiver 4, and elastically clamps them. As a result, it is supported at the lower end of the ball hanging frame 2. The upper end of this ball receiver 4 is shaped like a plate, and the ball is supported by its peripheral edge 4a. The center of gravity of the ball suspension frame 2 is determined so that the center of the ball receiver 4 is located right below the pivot point 6 of the ball suspension frame 2. If necessary, the position of the center of gravity of the ball hanging frame 2 can be adjusted by appropriately cutting each arm of the cuttable cross member 8 that is fitted and supported by the lower end neck 4b of the ball receiver 4. I can do it.

The bias indicator 5 is made of a thin wire and is provided at the lower end of the ball receiver 4, and its free end forms a concentric circle centered on the cross line 9a provided on the hanging frame support member 3 and the intersection of the cross line 9a. 9b, and cooperates with the display section 9 to display the tilting state of the ball hanging frame 2.

Adjustment screws 1 are provided at the four corners of the stand 6b of the hanging frame support member 3 to align the lower end of the biased display 5 with the center of the display section 9.
0 is provided, and if there is a misalignment during use, by moving these screws 10 up and down with respect to the base 6b, the slight adjustment of the hanging frame support member 6 in the no-load state can be made. The above alignment is performed by adjusting the inclination.

Assume that the bias display body 5 is now pointing to the center of the display section 9. In this state, when golf ball B is placed on the ball receiver, if the ball is a flat center of gravity ball and its center of gravity is off the vertical line V that includes one point of the swing center of the ball hanging frame, the ball The ball hanging frame 2 is tilted in a direction in which the center of gravity approaches the vertical line, and the ball hanging frame remains stationary with the center of gravity of the ball hanging frame 2 and the center of gravity of the ball being balanced, so it is necessary to know the eccentric center of gravity of the ball. The approximate amount of eccentricity of the center of gravity can be known from the amount of deviation of the deviation display 5 with respect to the display section 9.

゛As a means for supporting the ball suspension frame 2 on the suspension frame support member 3, the suspension frame support member 6 is provided with a tapered part 6 projecting upward,
Of course, the bearing may be provided in the ball suspension frame, or a small steel ball may be used instead of the pointed shaft. More ball hanging frame? As a means for displaying the amount of displacement, in addition to directly displaying it on the bias display body 5 and the display section 9 as in the embodiment described above, there is also a method of detecting the displacement of the ball hanging frame electrically or optically and displaying it. It may also be displayed. Such a displacement amount detection means can be easily obtained by applying a movable detection means in general measurement technology. Further, the mounting position 16 of the bias display body is not necessarily limited to the lower end of the ball hanging frame, but can be provided at an appropriate position on the ball hanging frame depending on the design.

The concentric circles of the display section 9 that cooperate with the bias display body 5 are color-coded at the center, concentric rings around the outer periphery, and concentric rings around the outer periphery, for example, from the center to blue, yellow, and red. It is convenient to use this as a guide to determine the degree of eccentricity of the center of gravity.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a ball eccentric center of gravity tester showing an embodiment of the present invention, and FIG. 2 is a sectional view of the ball receiver. 1... Eccentric center of gravity tester, 2... Ball hanging frame, 6...
Hanging frame support member, 4... Ball receiver, 5... Biased display body, 9... Display section. Procedural Amendment (December 9, 1981) Case Indication 1981 Patent Application No. 159 < S31 No. 2
Name of the invention Ball eccentric center of gravity tester 3 Relationship with the case of the person making the amendment Name of patent applicant (name) Jyuji Yamaguchi 4 Agent address 156 Address 2-6-28-5 Sakuragaoka, Setagaya-ku, Tokyo Amendment Subject of "Detailed Description of the Invention" Column 6 of the Specification, Contents of Amendment (1) - Next to page 2, line 15 of the specification, insert the following sentence in a new line. ``Conventionally, the eccentric center of gravity of a spherical object, such as a golf ball, could be determined by floating the golf ball in a liquid with a specific gravity greater than that of the golf ball and observing the posture of the golf ball at rest in the liquid. If the golf ball assumes a position such that one point in the liquid is always at the top of the ball (this top is exposed above the liquid surface), the ball is an eccentric ball. This conventional center of gravity test method requires the preparation of a specific i+'j body, so it is difficult to say that anyone can perform this test easily. It is also difficult to get an idea. (21, page 7, line 7, insert the following sentence in a new line. ``The display unit 9 indicates that the ball hanging frame 2 is oscillating; If it is correctly positioned on a vertical line including If the center of gravity of the ball hanging frame 2 is on the line connecting the lower end of the ball hanging frame 2 with the lower end of the ball hanging frame 2, the bias display body 5\i is oriented toward the center of the display section 9 while the ball hanging frame 2 is suspended from the hanging frame support member 6. If it does not point, it means that the center of swing of the ball hanging frame 2 and the center of the display section 9 are not on the vertical line, so it is necessary to correct the attitude of the hanging frame support member 3. (31, page 7, line 14, next to
Insert the following statement on a new line. If the bearing 7 is fixed to the hanging frame support member 3 so that the center of swing of the ball hanging frame 2 is located directly above the display section 9 when the top surface of the stand 3b is placed horizontally, the stand By operating the adjustment screw 10 so that the base 3b is horizontal, the center of swing of the ball hanging frame will automatically be located directly above the display section 9.The horizontal state of the base 3b is adjusted to the appropriate position of the base 6b. This can be easily obtained by preferably disposing a small type of bubble level having a widely known circular scale on the display section 9K.When the table 3b is in the horizontal state Vζ, the bubble level -1 (4) Set rvj in the second row at the bottom of page 7 to [T-
Correct to 1. 6. Insert "The upper end of the ball hanging frame may be hung from the hanging frame support member 6 with a relatively short string. Also," is inserted before the word "ball" in the 10th line of page 8. (6) Add the following sentence at the end of the last line of No. 800. For example, if a spirit level is used as the hanging frame deviation display means, a well-known cylindrical bubble tube with a circular scale is provided on the top surface of the ball hanging frame. In this case, the deviation indicator 5 and display part 9 are It can be omitted.”

Claims (1)

[Claims] 1. A ball hanging frame having a swinging center point and a ball receiver located directly below this center point, and a ball hanging frame that swingably supports the ball hanging frame at the swinging center point. A ball eccentric center of gravity tester comprising: a frame support member; and a suspension frame deviation display means for displaying the inclination of the ball suspension frame, which is provided on the suspension of the ball. 2. A ball hanging frame having a swinging center point and a ball receiver located directly below this center point; a hanging frame support member that swingably supports this ball hanging frame at the swinging center point; consisting of a bias indicator provided on a part of the ball suspension frame and displaying the inclination of the ball suspension frame, and a concentric circle provided on the suspension frame support member that cooperates with the bias indicator,
A ball eccentric center of gravity tester having a display section in which the center part and the concentric ring around the outer periphery are color-coded.