JPH0653902U - Rotation axis center indexing device that also measures the length of the rolling track displayed on the surface of the bowling ball - Google Patents

Abstract

(57) [Abstract] [Purpose] The position of the rotary axis can be quickly and accurately determined, and at the same time, the length of the rolling track used as data for determining the appropriate position of the finger hole together with the rotary axis position. An object of the present invention is to provide a device that can easily measure the height. [Structure] A thrust bearing 5 for supporting a bowling ball 4 is fitted to an upper end portion of a support cylinder 1 provided on an upper surface of one side of a base 2, and a marking tool is provided at a center of a wall 6 of the support cylinder provided below the thrust bearing 5. 12 insertion shafts 8 are provided so that they can be raised and lowered by levers 15. On the other hand, a measuring plate is rotatably provided on the upper part of the support column 16, an inner edge 20 of the measuring plate 18 is formed in an arc shape corresponding to the outer circumference of the bowling ball 4, and the inner edge 20 is formed.
Then, a length measuring scale 21 of the rolling track T displayed on the surface of the bowling ball 4 is provided. By operating the lever 15, it is possible to mark the position of the axis of rotation. Also,
The length of the rolling track T can be measured by the length measuring scale 21.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device capable of quickly and accurately measuring the length of a rolling track displayed on the surface of a bowling ball and indexing the center of a rotating shaft that is the center of the rolling track.

[0002]

[Prior art]

 The weight distribution structure inside the bowling ball is a high center-of-gravity type in which the center of gravity is located far from the center of the bowling ball due to the position and shape of the weight block provided inside the bowling ball (Figs. 3 (a) (b)). ) And a low center of gravity type having a center of gravity near the center of the bowling ball (Figs. 3 (c) and (d)). Further, regarding the high center of gravity type and the low center of gravity type, the parts with large specific gravity are It can be classified into a distributed type (Figs. 3 (a) and (c)) that exists relatively widely and a centralized type (Figs. 3 (b) and (d)) in which parts with a large specific gravity are small. Due to the difference in the mold and the position of the finger hole, that is, the difference in the grip position, the orbital characteristics of the bowling ball moving while rolling in the lane will be different. In addition, since the bowling ball thrown by a person is a ball in addition to the difference in the method of throwing by each bowler, the rolling track (T shown in FIG. 4), which is the grounding line with the lane of the bowling ball, is Not only the bowling ball passing through the maximum diameter position but also various rolling tracks T as shown in FIGS. 4 (a), (b) and (c) are generated. As a result, different rotation axis cores are generated, and the trajectory characteristics of the bowling ball are also accompanied by this.

Therefore, since the positional relationship between the weight block and the grip portion of the bowling ball changes depending on the position of the bowling ball where the finger hole is drilled, the operation of the bowling ball traveling in the lane can be predicted. It is possible to set the fingerhole position of the bowling ball in advance so as to raise the hook that is prone to strike in the uppermost state according to the individual ball quality. Then, in order to determine the appropriate position of the finger hole for drilling according to the individuality of each bowler and the structure of the bowling ball used, as data, the rolling track of the bowling ball previously used by the bowler is used. It is necessary to clarify the axis of rotation and the axis of rotation, but conventionally, in order to determine the position of the axis of rotation, for example, a three-dimensional scale that is used according to the quarter surface of the bowling ball is used. By doing so, multiple lines were drawn perpendicular to the rolling track displayed on the surface of the bowling ball, marks were made at the intersections of these multiple lines, and this was estimated as the position of the axis of rotation. It is a thing.

[0004]

[Problems to be solved by the device]

 However, since the scale used in the above-described conventional method for indexing the rotational axis center position is formed in an arc shape by matching the contact surface of the scale with the bowling ball to the maximum outer circumference of the bowling ball, As shown in 4 (b) and (c), if the rolling track T does not pass through the position of the diameter of the bowling ball, the scale cannot be attached along the rolling track T to the surface of the bowling ball. As a result, the axis of the rotary shaft cannot be accurately indexed, which requires a long time.

The present invention eliminates the above-mentioned problems of the related art, and can quickly and accurately determine the position of the rotary shaft core, and at the same time, determines the appropriate position of the finger hole together with the rotary shaft core position. The purpose is to provide a device that can easily measure the length of the rolling track used as data.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the device according to the present invention has a thrust bearing 5 for supporting a bowling ball 4 fitted on an upper end of a support cylinder 1 provided on an upper surface of one side of a base 2, and a support provided below the thrust bearing 5. The insertion shaft 8 of the marking tool 12 is provided at the center of the drawing wall 6 of the cylinder so as to be able to move up and down by a lever 15 inserted from the outside of the support cylinder 1, and on the side of the supporting cylinder 1 on the base 2. A measurement plate 18 is rotatably provided on the upper part of the established support column 16 by being supported by brackets 17 and 17 ', and an inner edge 20 of the measurement plate 18 is formed in an arc shape so as to correspond to the outer circumference of the bowling ball 4. Further, the length measuring scale 21 of the rolling track T displayed on the surface of the bowling ball 4 is provided on the inner edge 20.

[0007]

[Action]

 First, in the case of bowling balls that have been used for a long time, fine scratches are concentrated on the surface in a ring shape, and this scratch group is the rolling track T. Therefore, use a colored pencil or crayon at the center of the scratches. Draw a line to clearly show the rolling track. If the surface of the bowling ball is not damaged because it is a new bowling ball, the oil applied to the lane is actually applied to the surface of the bowling ball in a ring shape. A rolling track is clearly displayed by drawing a line with colored pencils.

Next, the measuring plate 18 is turned to the side of the support cylinder 1, and then the bowling ball 4 is placed in a state in which the rolling track T is horizontal as shown in FIGS. 1 and 2. It is supported by a thrust bearing 5 fitted to the upper end of the rolling bearing T, and the measuring plate 18 is aligned with the center of the support barrel 1 and the bowling ball 4, and then the rolling track T is gently rotated by hand. By adjusting the support angle of the bowling ball 4 so as not to move up and down relative to the length measuring scale 21 of the corresponding measuring plate 18, the rolling track T is accurately adjusted to the horizontal state, and then the lever is adjusted. When the insertion shaft 8 and the marking tool 12 attached to the upper end portion thereof are raised by operating 15, the upper end of the marking tool 12 contacts the lower surface of the bowling ball 4. As a result, this marks one position on the axis of rotation. At this time, the upper surface of the bowling ball 4 can be marked in accordance with the length measuring scale 21 at the tip of the measuring plate 18 displaying zero, but this is the other position of the rotary shaft core.

Further, the numerical value of the length measuring scale 21 of the measuring plate 18 aligned with the rolling track T is measured as the length of the rolling track T.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In the figure, reference numeral 1 is a support cylinder fixed to the upper surface of one side of a base 2, and a step portion 3 is formed on the inner circumference of the upper end portion thereof, and a thrust bearing 5 having a diameter suitable for supporting a bowling ball 4 is fitted therein. Aligned and supported. Below this thrust bearing 5, the picture wall 6 of the support cylinder 1 is provided integrally with the support cylinder 1, and the insertion shaft 8 of the marking tool is inserted into the center hole 7 provided at the center of the picture wall 6. It is fitted vertically. Retaining rings 9 and 9'are attached to the upper and lower ends of the insertion shaft 8, respectively, and are inserted between the retaining ring 9'underneath and the wall 6 to insert a spring 10 on the insertion shaft 8. By fitting them, downward spring pressure is applied to the insertion shaft 8. Further, an insertion hole 11 is provided at the upper end of the insertion shaft 8, and a marking tool 12 such as a pointed crayon or a rubber having the same shape and a crayon attached to the upper end is attached to the insertion hole 8. And the lower end of the insertion shaft 8 is inserted into the inside from an opening 13 provided at the lower part of one side surface of the support cylinder 1, and the middle part is pivotally attached to the support piece 14 at the tip of the lever 15. When the outer end of the lever 15 is manually held, the spring 10 is compressed and the insertion shaft 8 and the marking tool 12 provided on the upper end of the spring 10 are raised, and the lever 15 is also supported. When the hand is released from, the spring 10 returns to the position shown in FIGS. 1 and 2 due to the restoring force of the spring 10.

A support 16 is established on the side of the support cylinder 1 on the base 2, and an upper end of the support 16 is supported by a pair of upper and lower brackets 17, 17 ′ fitted to the support 16. The measurement plate 18 is rotatably provided. The upper bracket 17 is provided with a set screw 19 for stabilizing the position of the measuring plate 18. Further, the inner edge 20 of the measuring plate 18 is formed in an arc shape corresponding to the outer circumference of the bowling ball 4, and the length measuring scale 21 of the rolling track T displayed on the surface of the bowling ball 4 is displayed on the inner green 20. Has been applied.

[0012]

[Effect of device]

 As described above, the present invention gently rotates the bowling ball supported on the thrust bearing as described above by hand, and the supporting angle of the bowling ball is adjusted so that the rolling track does not move vertically relative to the length measuring scale of the corresponding measuring plate. Since it can be adjusted, it becomes possible to support the bowling ball on the thrust bearing accurately in a horizontal state. Therefore, if the lever is operated in that state and the marking tool is used to mark the center of the lower end of the bowling ball, which is the center of rotation at this time, the axis of rotation of the rolling track can be extremely accurately and quickly indexed. At the same time, the length of the rolling track, which is used as data for determining the appropriate position of the finger hole together with the position of the axis of rotation, is extremely accurately and quickly determined by the length measuring scale of the measuring plate. It can be measured.

Furthermore, by using these indexed rotary axes and measured lengths of rolling tracks as data for indexing the appropriate positions of the finger holes to be drilled, the sphere quality of each individual With this, a very great practical effect such as providing a bowling ball at a finger hole position that can raise a hook that is prone to strike in the uppermost state.

[Brief description of drawings]

FIG. 1 is a perspective view of an apparatus according to the present invention.

FIG. 2 is a vertical sectional side view of a main part of the device according to the present invention.

FIG. 3 is a cross-sectional view showing a weight distribution structure inside a bowling ball.

FIG. 4 is a front view showing types of rolling tracks of a bowling ball.

[Explanation of symbols]

 1 Support Tube 2 Base 4 Bowling Ball 5 Thrust Bearing 6 Wall 8 Insert Shaft 12 Marking Tool 15 Lever 16 Struts 17, 17 'Bracket 18 Measuring Plate 20 Inner Edge of Measuring Plate 21 Length Measuring Scale T Rolling Track

Claims (1)

[Scope of utility model registration request] 1. A thrust bearing for supporting a bowling ball is fitted to an upper end portion of a support cylinder provided on the upper surface of one side of a base, and a marking tool is inserted in the center of an image wall of the support cylinder provided below the support bearing. The shaft is provided so as to be able to move up and down by a lever inserted from the outside of the support cylinder, and a measurement plate is rotatably provided by being supported by a bracket on the upper part of the pillars established on the side of the support cylinder on the base. Displayed on the surface of the bowling ball in which the inner edge of the measuring plate is formed in an arc shape corresponding to the outer circumference of the bowling ball, and a rolling track length measuring scale displayed on the surface of the bowling ball is provided on the inner edge. A rotating shaft core indexing device that also measures the length of a rolling track.