JPWO2006126277A1 - Device for adjusting the weight and center of gravity of bar-like instruments such as billiard cues - Google Patents

Abstract

The present invention is an apparatus for adjusting the weight and center of gravity position of a bar-shaped instrument such as a billiard cue, which is provided on the inner surface of a hollow portion formed in the bar-shaped instrument so as to open at one end thereof, and the valley diameter is a bar A female screw portion that gradually decreases toward the other end of the device, and a plurality of male screw members that are inserted into the hollow portion from one end of the rod-shaped device and screwed to the female screw portion at different positions in the length direction. And. According to this apparatus, the user himself / herself can arbitrarily and easily adjust the weight and the position of the center of gravity of the bar-shaped instrument. Moreover, in the case of the said apparatus, since a male screw member does not loosen during use of a rod-shaped instrument, there is no possibility of producing an adjustment error and a noise.

Description

The present invention relates to an apparatus for adjusting the weight and the position of the center of gravity of a bar-shaped apparatus such as a billiard cue, a tennis racket, a table tennis racket, or a golf club.
In this specification, the “rod-like instrument” includes an instrument having a rod-like shape in addition to an instrument having a rod-like shape as a whole.

  The billiard cue is generally composed of a shaft having a tip attached to a tip and a butt screwed to the proximal end of the shaft.

  Billiard players, especially professional players, may want to change the weight of the cue to be used and the center of gravity (balance) depending on the situation. For this reason, the player often prepares a plurality of cues having different weights and positions of the center of gravity to compete, but there is a problem that the amount of luggage increases and the cost burden increases.

Therefore, a device capable of adjusting the weight and the position of the center of gravity of the cue has been proposed. This type of device has a female screw part provided on the inner surface of a hollow part formed so as to open to the butt end of the bat, and has a different length (ie, weight) and is screwed into the female screw part. The one composed of a plurality of weight bolts is widely adopted. The female screw portion may be formed by inserting and fixing a long-axis nut into a hollow portion formed in the bat, or may be formed directly on the inner surface of the hollow portion of the bat. As the weight bolt, commercially available headed bolts of various lengths are usually used.
In the above apparatus, the user can change the weight and the position of the center of gravity of the cue by screwing an arbitrary weight bolt into the female thread portion in the butt end.
However, with this device, since the weight bolt is built in near the butt end of the cue, it is easy to adjust the position of the center of gravity of the cue that was in the front to move backward, but the opposite is difficult. It was. Further, in the above apparatus, since the number of weight bolts screwed to the female screw portion at a time is limited to one, it is particularly difficult to finely adjust the center of gravity position of the cue.

The following Patent Document 1 includes a hollow portion formed in the bat close to the butt end and having a female screw, and a plurality of male screw rods that are screwed to the female screw, and the hollow portion has a plurality of male screw rods. An apparatus for adjusting the weight and center of gravity position of a billiard cue has been disclosed.
According to this device, since a plurality of male screw rods can be inserted into the hollow portion of the bat at a time and screwed to the female screw, the finer weight and position of the center of gravity can be compared with the adjustment device described at the beginning. Can be adjusted.
However, in the case of the above-mentioned device, it is difficult to position the male screw rod in the hollow portion, and there is a possibility that much time and labor are required for adjustment. Further, in the above apparatus, there is a possibility that the position of the male screw rod may be shifted or a noise may be generated due to an impact applied to the cue during the Ryukyu.

By the way, it is generally known that the characteristics of the cue, such as ball separation, power, and hitting sound, are related to the material and weight of the cue, but these characteristics also change depending on the length and position of the internal space occupied by the bat. The present inventor has found out. More specifically, it is considered that the characteristics of the cue change depending on the degree of expansion and contraction of air in the bat inner space during the Ryukyu. However, conventionally, there has been no means for obtaining desired characteristics by arbitrarily adjusting the length and position of the internal space of such a cue.
US Patent Application Publication No. 2004/0142754

The object of the present invention is that the user himself / herself can arbitrarily and easily adjust the weight and the center of gravity of a bar-like instrument such as a billiard cue, and there is a risk of causing misadjustment and noise during use. There is no device to provide.
Another object of the present invention is to provide an apparatus capable of adjusting the length and position of the internal space that affects the characteristics of the instrument in addition to the adjustment of the weight and center of gravity of the bar-shaped instrument. .

  The apparatus for adjusting the weight and center of gravity of a bar-shaped instrument according to the present invention is provided on the inner surface of a hollow part formed so as to open at one end of the bar-shaped instrument, and the diameter of the valley gradually decreases toward the other end of the bar-shaped instrument. And a plurality of male screw members that are inserted into the hollow portion from one end of the rod-shaped instrument and screwed to the female screw portion at different positions in the length direction.

In the apparatus of the present invention, since the tapered screw as described above is used as the female screw portion, each male screw member is always screwed to the female screw portion at a predetermined length position. It stops and does not loosen easily.
Further, in the case of the above-described apparatus, the position of the screw alignment with respect to the female screw portion is determined in advance depending on the male screw member to be used, so that it is particularly easy to adjust the position of the center of gravity.
Therefore, according to the above-mentioned device according to the present invention, the user himself / herself can easily and finely adjust the weight and the center of gravity position of a bar-shaped instrument such as a billiard cue. In addition, according to the above apparatus, there is no possibility that the male screw member is loosened during use and the center of gravity is out of position or no sound is produced.

  In the apparatus for adjusting the weight and center of gravity of the bar-shaped instrument according to the present invention, the female screw portion preferably has a substantially constant inner diameter. Therefore, the height of the thread of the female thread portion changes so as to gradually decrease toward the other end of the rod-shaped instrument.

If the female screw portion has a substantially constant inner diameter, each male screw member can be moved by a rotating operation from when it is inserted into the female screw portion until it reaches a predetermined screwing position. The attaching / detaching operation can be performed more easily and quickly.
In addition to the above-described configuration, the female screw portion may be a taper screw that changes in a tapered shape so that the inner diameter thereof is substantially parallel to the diameter of the valley.

  In the apparatus for adjusting the weight and center of gravity of the bar-shaped instrument according to the present invention, at least one male screw member may have a through-hole passing through its axis.

  When the male screw member having the through hole as described above is screwed to the female screw portion, the inner spaces before and after the male screw member are communicated with each other through the through hole. Therefore, if the adjusting device according to the present invention includes a male screw member having the above-described through hole, the position and length of the internal space of the rod-shaped instrument can be changed by appropriately using the male screw member, thereby It is possible to adjust characteristics such as separation, power, and hitting sound.

  In the apparatus for adjusting the weight and center of gravity position of the bar-shaped instrument according to the present invention, the female screw part is usually formed by inserting and fixing a long-axis female screw member into the hollow part of the bar-shaped instrument. The fitting of the female screw member to the hollow part of the rod-shaped instrument may be sufficient only by fitting, but more preferably in combination with an appropriate means selected from bonding, screw joining, welding, brazing, etc. Do. In addition, you may make it form an internal thread part directly in the hollow part inner surface of a rod-shaped instrument.

  The length of the female screw portion is appropriately determined according to the length of the rod-like instrument to be applied and the purpose of use. For example, when the present invention is applied to a billiard cue, the female thread portion is usually provided on the inner surface of a hollow portion formed so as to open to the butt end of the bat, and its length is usually 20 to 50 cm, Preferably it is about 40 cm.

  The male screw member is usually formed from a metal material such as aluminum, iron, or stainless steel. The number of male screw members may be appropriately determined in consideration of the degree of adjustment and the like, but finer adjustment is possible as the number is increased. For example, when applied to a billiard cue, as many male screw members as can be arranged in the female screw portion at a pitch of 1 to 9 cm are prepared.

  Further, as the male screw member, two or more sets having different pitches and numbers may be prepared. For example, a set having a small pitch and a large number of male screw members is used as a professional specification. A small number of sets may be amateur specifications.

  As for the male screw member, it is preferable to prepare the number of the female screw part that can be closed as long as the male screw member is installed.This is preferable because it can be finely adjusted, but for example, for amateurs, where fine adjustment is not required, It is also possible to reduce the number to a number that is arranged in a row on the female screw portion.

  When finer adjustment is required, a plurality of male screw members having the same shape but different weights may be prepared. Such a male screw member may be formed of a plurality of metal materials having different specific gravities, for example.

  The male screw member that is screwed to the end of the female screw portion that is closer to the other end of the rod-shaped instrument may be such that a part thereof protrudes from the female screw portion. If such a male screw member is used, the barycentric position of the bar-shaped instrument can be set further closer to the other end, and the range of adjustment is expanded. Further, if a plurality of male screw members having different projecting lengths are prepared, the range of adjustment of the center of gravity position can be further expanded. In addition, it is not necessary to form a screw thread in the protrusion part of the said external thread member normally.

  The male screw member is usually formed with a fitting portion at the rear end thereof that matches the screw turning tool. The fitting part can be configured with, for example, a hexagonal hole that matches a hexagonal bar wrench, a cross groove that matches a plus screwdriver, or a minus groove that matches a minus screwdriver, but also matches other special rotating tools. It may be shaped.

  The hole diameter of the through hole formed in the male screw member may be appropriately determined according to the valley diameter of the male screw member so that air can be circulated. For example, when the present invention is applied to a billiard cue Is preferably about 2 mm.

  The female screw portion and each male screw member have a symmetrical thread cross section (see FIG. 2) and an asymmetric one in which the thread cross section is offset toward the other end of the rod-shaped instrument (see FIG. 3). It can also be. In particular, the latter case is advantageous in that the looseness of the male screw member screwed to the female screw portion is less likely to occur.

  The apparatus according to the present invention can be applied to either a case where the apparatus is provided in advance in a bar-shaped instrument or a case where it is retrofitted for maintenance of an existing bar-shaped instrument.

BRIEF DESCRIPTION OF THE DRAWINGS It is the exploded view of the billiard cue which shows the 1st Embodiment of this invention and was equipped with the weight and gravity center position adjustment apparatus. It is a longitudinal cross-sectional view of the weight and center-of-gravity position adjusting device mounted on the billiard cue of FIG. FIG. 5 is a longitudinal sectional view of a weight and center-of-gravity position adjusting device mounted on a billiard cue, showing a second embodiment of the present invention.

Explanation of symbols

(1): Billiard cue
(2): Tap
(3): Shaft
(4): Bat
(41): Bat end
(42): Hollow part
(6) (6A): Female thread
(R11): Valley diameter
(R12): Inner diameter
(61) (61A): Screw thread
(7) (7A): Male thread member
(R21): Valley diameter
(R22): Outer diameter
(71) (71A): Screw thread
(73): Through hole

  1 and 2 show a first embodiment of the present invention. In this embodiment, the present invention is applied to an apparatus for adjusting the weight and center of gravity position of a billiard cue.

  As shown in FIG. 1, the billiard cue (1) is composed of a shaft (3) with a tap (2) attached to the tip and a bat (4) connected to the base end of the shaft (3). Yes. The shaft (3) and the bat (4) are screwed into a screw hole (31) formed at the base end of the shaft (3) with a screw rod (5) attached to the tip of the butt (4) in a protruding manner. So that they are separably connected. In addition, the basic structure of the cue is not limited to the above-described one. For example, the whole cue is integrally formed, or the shaft or the bat is formed by connecting a plurality of parts. Also, the present invention can be applied.

  The bat (4) is formed with a hollow portion (42) so as to open to the butt end (41). The hollow portion (42) has a length that reaches from the butt end (41) to the vicinity of the joint portion (43) to which the screw rod (5) is attached.

  On the inner surface of the hollow portion (42), there is provided a female screw portion (6) that changes so that the diameter (R11) of the valley gradually decreases toward the tip of the bat (4) (see FIG. 2). The female screw portion (6) has a constant inner diameter (R12), and therefore the height of the thread (61) of the female screw portion (6) gradually increases toward the tip of the bat (4). It is supposed to change to lower. The female screw portion (6) is formed by inserting and fixing a long shaft female screw member (60) into the hollow portion (42) of the bat (4). Although not shown in detail, a male screw portion is formed at least at the rear end portion of the front and rear end portions of the outer peripheral surface of the female screw member (60), and the male screw portion is formed on the inner peripheral surface of the bat (4). By being screwed in, the female screw member (60) is firmly fixed in the hollow portion (42) of the bat (4). The female screw part (6) has a length substantially equal to half of the length of the bat (4), specifically about 40 cm.

  The weight and center-of-gravity position adjusting device of the billiard cue (1) is configured by the female screw portion (6) and a plurality of male screw members (7) described later.

  Each male screw member (7) is rod-shaped and has a valley diameter (R21) substantially equal to the inner diameter (R12) of the female screw part (6), and from the butt end (41) to the hollow part (42 ) And a screw thread (71) that can be screwed to the female screw portion (6) at different positions in the length direction (see FIG. 2). Accordingly, each male screw member (7) is configured such that the height of the screw thread (71), that is, the outer diameter (R22) gradually decreases toward the tip.

  A bumper (8) is detachably fitted to the butt end (41) so as to close the opening of the hollow portion (42). The bumper (8) is made of, for example, rubber or synthetic resin.

  FIG. 2 shows a state in which the weight and center-of-gravity position adjusting device is mounted on the bat (4) of the billiard cue (1). In this figure, three male screw members (7) are screwed to the female screw portion (6).

  As shown in FIG. 2, the male screw members (7) are arranged such that adjacent ones are arranged at intervals in a state of being screwed to the female screw portion (6). The female screw portion (6) and the screw threads (61) (71) of each male screw member (7) have a symmetrical cross section.

  A hexagonal hole (72) that matches a hexagonal bar spanner (not shown) is formed in the rear end surface of each male screw member (7).

  In addition to the three male screw members (7) shown in the figure, another male screw member that can be screwed to the female screw portion (6) at a position that does not overlap with these members is prepared, and these are used as appropriate. Of course, it is possible. Further, the lengths of the male screw members (7) may be different from each other as shown in FIG. 2, or may have the same length and be arranged at a constant pitch.

  When changing the weight and position of the center of gravity of the billiard cue (1) using the above device, remove the bumper (8) and remove the male screw member (7) to be screwed into the female screw part (6) as appropriate, or add or Replace it. In this case, since each male screw member (7) is always screwed and fixed to the female screw portion (6) at a predetermined length position, it is particularly easy to grasp and adjust the position of the center of gravity. In order to make adjustment easier, for example, an indication (not shown) indicating the screwing position and weight may be provided on the end face of each male screw member (7).

  In addition, each male screw member (7) screwed to the female screw portion (6) is securely fixed by a unique screw shape as shown in FIG. Will not loosen easily, and there is no worry of causing adjustment errors or noise.

  FIG. 3 shows a second embodiment of the present invention. In this embodiment, each male screw member (7A) has a through hole (73) passing through its axis. The diameter of the through hole (73) is about 2 mm. Therefore, in the cue (1) of FIG. 3, the internal spaces located before and after each male screw member (7A) are communicated with each other by the through hole (73). This increases the overall length of the internal space of the bat (4) compared to the cue (1) of FIG. 2, so the sphere of the cue (1) moves away faster, and even a weak player can hit a strong ball. Is possible. In FIG. 3, each of the three male screw members (7A) has a through-hole (73), but instead of any one or two of them, a through-hole as shown in FIG. If the male screw member (7) having no hole is screwed together, the length and position of the internal space of the bat (1) will change, thereby making it possible to finely adjust the characteristics of the cue (1). Become.

  Further, in the apparatus shown in FIG. 3, the female screw portion (6A) and each male screw member (7A) are arranged so that the rear side (lower side in FIG. 3) of the two sides of the screw threads (61A) (71A) is the bat. Crossed to form an acute angle with the length direction of (4), and the front side (upper side in FIG. 3) is constituted by a saw-toothed screw that is orthogonal to the length direction of the bat (4). . Therefore, in this embodiment, the probability that each male screw member (7A) screwed to the female screw portion (6A) is loosened by an impact received during a round ball or the like is further reduced, and the reliability is improved.

  In each of the embodiments described above, the device of the present invention is mounted on the bat of the billiard cue. However, the shaft and the position of the center of gravity are adjusted by mounting the device of the present invention on the shaft as in the case of the bat. Can be done.

  Moreover, in the said embodiment, although the application example to the billiard cue of this invention was shown, this invention adjusts the weight and gravity center position of other rod-shaped instruments, for example, a tennis racket, a table tennis racket, and a golf club. The same applies to the above.

Claims (3)

A device for adjusting the weight and center of gravity of a bar-like instrument such as a billiard cue,
A female thread portion that is provided on the inner surface of the hollow portion formed so as to open at one end of the rod-shaped instrument and that the diameter of the valley gradually decreases toward the other end of the rod-shaped instrument;
And a plurality of male screw members that are inserted into the hollow portion from one end of the rod-shaped instrument and screwed to the female screw portion at different positions in the length direction.   The weight and center-of-gravity position adjusting device for a bar-shaped instrument according to claim 1, wherein the female screw portion has a substantially constant inner diameter. The weight and center-of-gravity position adjusting device according to claim 1 or 2, wherein at least one male screw member has a through-hole passing through its axis.

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