US20080090670A1 - Aiming Device For Billiard Cue - Google Patents

Aiming Device For Billiard Cue Download PDF

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Publication number
US20080090670A1
US20080090670A1 US11/549,117 US54911706A US2008090670A1 US 20080090670 A1 US20080090670 A1 US 20080090670A1 US 54911706 A US54911706 A US 54911706A US 2008090670 A1 US2008090670 A1 US 2008090670A1
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United States
Prior art keywords
cylindrical lens
parallel light
aiming device
light source
light beam
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Abandoned
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US11/549,117
Inventor
Sen-Yung Liu
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Individual
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Individual
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Priority to US11/549,117 priority Critical patent/US20080090670A1/en
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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63D—BOWLING GAMES, e.g. SKITTLES, BOCCE OR BOWLS; INSTALLATIONS THEREFOR; BAGATELLE OR SIMILAR GAMES; BILLIARDS
    • A63D15/00—Billiards, e.g. carom billiards or pocket billiards; Billiard tables
    • A63D15/006—Training or aiming arrangements on billiard tables

Definitions

  • the present invention relates to an aiming device for a billiard cue, and in particular to an aiming device that can provide a high precise aiming in billiards.
  • aiming reference points are located at a periphery of a conventional billiard table. If these points are located at the other side of the table, it is inevitable to have a deviation of aiming by naked eyes. Later a laser light aiming device was produced, which could project a light point onto an object ball to be struck, but there is not a baseline between the projection point and the billiard cue, thereby players still cannot aim at the ball precisely.
  • a primary objective of the present invention is to provide an aiming device for a billiard cue, which can generate a fanned light beam by scattering a parallel light beam through a cylindrical lens.
  • the fanned light beam projects a projection line for aiming at between a cue ball and an object ball.
  • the projection line the billiard cue is in alignment with the cue ball and the object ball so that the billiard cue can strike the cue ball to impact onto the object ball along the projection line to let the object ball fall into a pocket.
  • an aiming device for a billiard cue in accordance with the present invention includes a fixing member, an extending member coupled with the fixing member at one end thereof, a parallel light source coupled with the other end of the extending member and having a projection hole for passing a parallel light beam emitted from the parallel light source, and a cylindrical lens mounted on one end of the parallel light source in front of the projection hole, whereby the parallel light beam becomes a fanned light beam after it passes through the cylindrical lens.
  • the parallel light source may be a laser light source or other light sources.
  • the fixing member may be a fixing clamp or a clamp that is sleeved on the billiard cue and fastened with screws. There is no limitation to the structure of the fixing member as long as it can fix the aiming device with the billiard cue.
  • the extending member may be, but not limited to, a curved rigid member. Any flexible or bendable extending members such as a flexible member in accordance with the present invention or a multiple rod linkage with ball pivot mechanisms are applicable, so as to be capable of adjusting a desired angle and a range of the projection light emitted from the parallel light source.
  • the cylindrical lens may be a circular, biconvex, biconcave, plano-convex, or plano-concave cylindrical lens.
  • the parallel light beam can be refracted by the cylindrical lens to produce a fanned light beam.
  • the fanned light beam is projected to form a projection line when it radiates on a surface of an object.
  • the billiard cue is in alignment with the cue ball and the object ball so that the cue ball can be hit to impact onto the object ball precisely. Travel trajectories of the cue ball and the object ball can be controlled through the help of the projection line.
  • FIG. 1 is a perspective view of an aiming device for a cue billiard in accordance with the present invention.
  • FIG. 2 is a side view of FIG. 1 .
  • FIG. 3A is an enlarged view showing a parallel light source and a cylindrical lens in accordance with the present invention.
  • FIG. 3B is an enlarged view showing an assembly of FIG. 3A .
  • FIG. 4 is a schematic view showing a track of a parallel light beam penetrating through a cylindrical lens.
  • FIGS. 5A-5E are schematic views showing different types of cylindrical lenses in accordance with the present invention.
  • FIG. 6 is a schematic view showing that the aiming device of FIG. 1 is in use.
  • FIG. 7 is a schematic view of an aiming device in accordance with a second embodiment of the present invention.
  • an aiming device 1 for a billiard cue in accordance with the present invention comprises a fixing member 10 , an extending member 20 , a parallel light source 30 and a cylindrical lens 40 .
  • the fixing member 10 is coupled with one end of the extending member 20 and the parallel light source 30 is coupled with the other end of the extending member 20 .
  • the cylindrical lens 40 is mounted on an end surface of the parallel light source 30 , whereby a fanned light beam is projected out of the cylindrical lens 40 when a parallel light beam emitted from the parallel light source 30 passes through the cylindrical lens 40 .
  • the fanned light beam is projected on a surface of an object to form a projection line for aiming.
  • the fixing member 10 is, but not limited to, a fixing clamp in this embodiment.
  • An inner rim of the fixing clamp 10 is configured to fit to an outer shape of a billiard cue P (see FIG. 6 ) for mounted thereon.
  • a gasket 11 can be further disposed on the inner rim of the fixing clamp 10 so as to securely mount the fixing member 10 to the billiard cue P.
  • the fixing member 10 may have a frame configured with the outer shape of the billiard cue P and fixed on the billiard cue P with screws.
  • the extending member 20 may be, but not limited to, a curved rigid member. Any flexible or bendable extending members 20 such as a flexible member in this embodiment or a multiple rod linkage with ball pivot mechanisms are applicable, so as to be capable of adjusting a desired angle and a range of the projection light emitted from the parallel light source 30 . There is no limitation to the bending angle of the extending member 20 and it can be adjusted according to the length of the billiard cue P and the location where the extending member 20 is installed.
  • the parallel light source 30 is, but not limited to, a laser light source in this embodiment. Any light sources that emit a parallel light beam may be used in the present invention. But a diameter of the light beam of the parallel light source 30 cannot be too large; otherwise it will be difficult to align with a baseline on the billiard cue P accurately.
  • the parallel light source 30 has a projection hole 32 defined on one end surface thereof for passing the parallel light bean.
  • a diameter of the projection hole 32 determines the diameter of the projection light emitted from the parallel light source 30 .
  • the parallel light source 30 comprises a battery 31 to provide power supply and a switch 35 to turn on/off the power supply.
  • the switch 35 is located on the parallel light source 30 , but it may be located on the extending member 20 or the fixing member 10 as well.
  • the battery 31 in the present invention is a button battery, but it can also be a lithium battery or alkaline battery. Accordingly, the parallel light source 30 can be constructed to receive different types of batteries.
  • the battery 31 can be placed in a battery pack 34 disposed between the fixing member 10 and the extending member 20 , whereby the projection head 33 of the parallel light source 30 is lighter (see FIG. 7 ). At this time, the switch 35 is provided on the battery pack 34 . Besides, the cylindrical lens 40 is set in a direction parallel to the fixing member 10 .
  • a parallel light beam L 1 emitted from the parallel light source 30 through the projection hole 32 enters into a lens surface 41 of the cylindrical lens 40 , which is closest to the parallel light source 30 , and goes out of a lens surface 42 of the cylindrical lens 40 , which is farthest from the parallel light source 30 .
  • the parallel light beam L 1 becomes a fanned light beam L 2 caused by refraction of the light from the cylindrical lens 40 .
  • the fanned light beam L 2 projects on a surface of a table B to form a projection line L 3 , which can be precisely applied to an aiming at between a cue ball and an object ball in billiards.
  • the cylindrical lens 40 is a circular cylindrical lens as shown in FIG. 4 .
  • the cylindrical lens 40 according to the present invention may be a biconvex cylindrical lens 50 , a convex-concave cylindrical lens 60 , a plano-convex cylindrical lens 70 , a plano-concave cylindrical lens 80 , a biconcave cylindrical lens 90 , or combinations thereof.
  • the parallel light beam L 1 can enter into a lens surface 51 , 61 , 71 , 81 or 91 of the cylindrical lens, which is closest to the parallel light source 30 , and goes out of a lens surface 52 , 62 , 72 , 82 or 92 of the cylindrical lens, which is farthest from the parallel light source 30 , respectively.
  • a length of the cylindrical lens 40 should be greater than the diameter of the projection hole 32 , so that the parallel light beam L 1 can be projected completely.
  • FIG. 6 shows an illustrative example of the aiming device 1 according to the present invention, which is in use.
  • the aiming device 1 is mounted on the billiard cue P with the fixing member 10 .
  • the extending member 20 is bended downwardly and the projection line L 3 of the fanned light beam L 2 is in alignment with a reference baseline P 1 on the billiard cue P by adjusting the extending member 20 .
  • the cue ball B 1 and the object ball B 2 are aimed along the projection line L 3 . By doing so, we can control the travel trajectory of the cue ball B 1 to hit the object ball B 2 more precisely.

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Abstract

An aiming device for a billiard cue is disclosed herein, which includes a fixing member, an extending member coupled with the fixing member at one end thereof, a parallel light source coupled with the other end of the extending member and having a projection hole for passing a parallel light beam emitted from the parallel light source, and a cylindrical lens mounted on one end of the parallel light source in front of the projection hole, whereby the parallel light beam becomes a fanned light beam after it passes through the cylindrical lens. The aiming device of the present invention can provide a high precise aiming in billiards.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to an aiming device for a billiard cue, and in particular to an aiming device that can provide a high precise aiming in billiards.
  • 2. The Prior Arts
  • Generally, when striking a cue ball, people use naked eyes to aim at the ball. Due to the inaccuracy of the viewing angle and the difficulty of long-distance aiming, the way of aiming at the ball by naked eyes is not precise enough. It can only help a little to adjust the striking strength and direction of the cue. Hence, ordinary people except for those skilled billiard players are hard to aim at the ball precisely by naked eyes.
  • Currently, aiming reference points are located at a periphery of a conventional billiard table. If these points are located at the other side of the table, it is inevitable to have a deviation of aiming by naked eyes. Later a laser light aiming device was produced, which could project a light point onto an object ball to be struck, but there is not a baseline between the projection point and the billiard cue, thereby players still cannot aim at the ball precisely.
    • SUMMARY OF THE INVENTION
  • A primary objective of the present invention is to provide an aiming device for a billiard cue, which can generate a fanned light beam by scattering a parallel light beam through a cylindrical lens. The fanned light beam projects a projection line for aiming at between a cue ball and an object ball. By the projection line, the billiard cue is in alignment with the cue ball and the object ball so that the billiard cue can strike the cue ball to impact onto the object ball along the projection line to let the object ball fall into a pocket.
  • To achieve the above-mentioned objectives, an aiming device for a billiard cue in accordance with the present invention includes a fixing member, an extending member coupled with the fixing member at one end thereof, a parallel light source coupled with the other end of the extending member and having a projection hole for passing a parallel light beam emitted from the parallel light source, and a cylindrical lens mounted on one end of the parallel light source in front of the projection hole, whereby the parallel light beam becomes a fanned light beam after it passes through the cylindrical lens.
  • According to the present invention, the parallel light source may be a laser light source or other light sources. The fixing member may be a fixing clamp or a clamp that is sleeved on the billiard cue and fastened with screws. There is no limitation to the structure of the fixing member as long as it can fix the aiming device with the billiard cue. The extending member may be, but not limited to, a curved rigid member. Any flexible or bendable extending members such as a flexible member in accordance with the present invention or a multiple rod linkage with ball pivot mechanisms are applicable, so as to be capable of adjusting a desired angle and a range of the projection light emitted from the parallel light source. The cylindrical lens may be a circular, biconvex, biconcave, plano-convex, or plano-concave cylindrical lens.
  • The parallel light beam can be refracted by the cylindrical lens to produce a fanned light beam. The fanned light beam is projected to form a projection line when it radiates on a surface of an object. Along the projection line, the billiard cue is in alignment with the cue ball and the object ball so that the cue ball can be hit to impact onto the object ball precisely. Travel trajectories of the cue ball and the object ball can be controlled through the help of the projection line.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The present invention will be apparent to those skilled in the art by reading the following detailed description of a preferred embodiment thereof, with reference to the attached drawings, in which:
  • FIG. 1 is a perspective view of an aiming device for a cue billiard in accordance with the present invention.
  • FIG. 2 is a side view of FIG. 1.
  • FIG. 3A is an enlarged view showing a parallel light source and a cylindrical lens in accordance with the present invention.
  • FIG. 3B is an enlarged view showing an assembly of FIG. 3A.
  • FIG. 4 is a schematic view showing a track of a parallel light beam penetrating through a cylindrical lens.
  • FIGS. 5A-5E are schematic views showing different types of cylindrical lenses in accordance with the present invention.
  • FIG. 6 is a schematic view showing that the aiming device of FIG. 1 is in use.
  • FIG. 7 is a schematic view of an aiming device in accordance with a second embodiment of the present invention.
    •  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • With reference to FIGS. 1 and 2, an aiming device 1 for a billiard cue in accordance with the present invention comprises a fixing member 10, an extending member 20, a parallel light source 30 and a cylindrical lens 40. The fixing member 10 is coupled with one end of the extending member 20 and the parallel light source 30 is coupled with the other end of the extending member 20. The cylindrical lens 40 is mounted on an end surface of the parallel light source 30, whereby a fanned light beam is projected out of the cylindrical lens 40 when a parallel light beam emitted from the parallel light source 30 passes through the cylindrical lens 40. The fanned light beam is projected on a surface of an object to form a projection line for aiming.
  • The fixing member 10 is, but not limited to, a fixing clamp in this embodiment. An inner rim of the fixing clamp 10 is configured to fit to an outer shape of a billiard cue P (see FIG. 6) for mounted thereon. A gasket 11 can be further disposed on the inner rim of the fixing clamp 10 so as to securely mount the fixing member 10 to the billiard cue P. Moreover, the fixing member 10 may have a frame configured with the outer shape of the billiard cue P and fixed on the billiard cue P with screws.
  • The extending member 20 may be, but not limited to, a curved rigid member. Any flexible or bendable extending members 20 such as a flexible member in this embodiment or a multiple rod linkage with ball pivot mechanisms are applicable, so as to be capable of adjusting a desired angle and a range of the projection light emitted from the parallel light source 30. There is no limitation to the bending angle of the extending member 20 and it can be adjusted according to the length of the billiard cue P and the location where the extending member 20 is installed.
  • The parallel light source 30 is, but not limited to, a laser light source in this embodiment. Any light sources that emit a parallel light beam may be used in the present invention. But a diameter of the light beam of the parallel light source 30 cannot be too large; otherwise it will be difficult to align with a baseline on the billiard cue P accurately.
  • Referring to FIGS. 3A and 3B, the parallel light source 30 has a projection hole 32 defined on one end surface thereof for passing the parallel light bean. A diameter of the projection hole 32 determines the diameter of the projection light emitted from the parallel light source 30. The parallel light source 30 comprises a battery 31 to provide power supply and a switch 35 to turn on/off the power supply. In this embodiment, the switch 35 is located on the parallel light source 30, but it may be located on the extending member 20 or the fixing member 10 as well. On the other hand, the battery 31 in the present invention is a button battery, but it can also be a lithium battery or alkaline battery. Accordingly, the parallel light source 30 can be constructed to receive different types of batteries. The battery 31 can be placed in a battery pack 34 disposed between the fixing member 10 and the extending member 20, whereby the projection head 33 of the parallel light source 30 is lighter (see FIG. 7). At this time, the switch 35 is provided on the battery pack 34. Besides, the cylindrical lens 40 is set in a direction parallel to the fixing member 10.
  • Referring to FIG. 4, a parallel light beam L1 emitted from the parallel light source 30 through the projection hole 32 enters into a lens surface 41 of the cylindrical lens 40, which is closest to the parallel light source 30, and goes out of a lens surface 42 of the cylindrical lens 40, which is farthest from the parallel light source 30. The parallel light beam L1 becomes a fanned light beam L2 caused by refraction of the light from the cylindrical lens 40. The fanned light beam L2 projects on a surface of a table B to form a projection line L3, which can be precisely applied to an aiming at between a cue ball and an object ball in billiards.
  • The cylindrical lens 40 is a circular cylindrical lens as shown in FIG. 4. Referring to FIGS. 5A-5E, the cylindrical lens 40 according to the present invention may be a biconvex cylindrical lens 50, a convex-concave cylindrical lens 60, a plano-convex cylindrical lens 70, a plano-concave cylindrical lens 80, a biconcave cylindrical lens 90, or combinations thereof. Accordingly, the parallel light beam L1 can enter into a lens surface 51, 61, 71, 81 or 91 of the cylindrical lens, which is closest to the parallel light source 30, and goes out of a lens surface 52, 62, 72, 82 or 92 of the cylindrical lens, which is farthest from the parallel light source 30, respectively. On the other hand, a length of the cylindrical lens 40 should be greater than the diameter of the projection hole 32, so that the parallel light beam L1 can be projected completely.
  • FIG. 6 shows an illustrative example of the aiming device 1 according to the present invention, which is in use. Firstly, the aiming device 1 is mounted on the billiard cue P with the fixing member 10. Then, the extending member 20 is bended downwardly and the projection line L3 of the fanned light beam L2 is in alignment with a reference baseline P1 on the billiard cue P by adjusting the extending member 20. When this adjustment is finished, the cue ball B1 and the object ball B2 are aimed along the projection line L3. By doing so, we can control the travel trajectory of the cue ball B1 to hit the object ball B2 more precisely.
  • Although the present invention has been described, it is apparent to those skilled in the art that a variety of modifications and changes may be made without departing from the scope of the present invention which is intended to be defined by the appended claims.

Claims (11)

1. An aiming device for a billiard cue, comprising:
a fixing member;
an extending member coupled with the fixing member at one end thereof;
a parallel light source coupled with the other end of the extending member and having a projection hole for passing a parallel light beam emitted from the parallel light source; and
a cylindrical lens mounted on one end of the parallel light source in front of the projection hole, whereby the parallel light beam becomes a fanned light beam after it passes through the cylindrical lens.
2. The aiming device as claimed in claim 1, wherein the parallel light source is a laser light source.
3. The aiming device as claimed in claim 1, wherein the extending member is flexible.
4. The aiming device as claimed in claim 1, wherein the fixing member is a fixing clamp.
5. The aiming device as claimed in claim 1, wherein the cylindrical lens is a circular cylindrical lens.
6. The aiming device as claimed in claim 1, wherein the cylindrical lens is a biconvex cylindrical lens.
7. The aiming device as claimed in claim 1, wherein the cylindrical lens is a convex-concave cylindrical lens.
8. The aiming device as claimed in claim 1, wherein the cylindrical lens is a plano-convex cylindrical lens.
9. The aiming device as claimed in claim 1, wherein the cylindrical lens is a plano-concave cylindrical lens.
10. The aiming device as claimed in claim 1, wherein the cylindrical lens is a biconcave cylindrical lens.
11. The aiming device as claimed in claim 1, wherein a battery pack is mounted between the fixing member and the extending member.
US11/549,117 2006-10-13 2006-10-13 Aiming Device For Billiard Cue Abandoned US20080090670A1 (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090143156A1 (en) * 2007-12-03 2009-06-04 Ted Walter Schulze Pool cue training device
US7611416B1 (en) * 2007-05-18 2009-11-03 Mattina Anthony J Cue stick apparatus and method
US20100040376A1 (en) * 2008-08-15 2010-02-18 Chun-Yi Lin Receiver
US20110070959A1 (en) * 2009-09-18 2011-03-24 Wylie Jill M Clip/fastener with wheel, ball bearing, or roller device or apparatus: Junior shark guiding wheel
KR101581594B1 (en) * 2014-12-17 2016-01-11 전북대학교산학협력단 Real time billiard assistant system
KR101894082B1 (en) * 2017-12-07 2018-08-31 박철훈 Thickness check pointer for billiard practice
KR101966789B1 (en) * 2018-07-06 2019-04-08 박철훈 Billiard pointer for checking the thickness and supporting the cue stick
KR20190069110A (en) * 2017-12-11 2019-06-19 박철훈 Hitting point display pointer for billiard practice
WO2020085725A1 (en) * 2018-10-25 2020-04-30 에이에스케이 주식회사 Billiards pointer device for providing information about thickness and contact points
CN111228779A (en) * 2020-02-11 2020-06-05 王永辉 Method and mechanism for aiming, calculating and indicating thickness of cut ball and billiard posture adjusting device
US10821349B1 (en) * 2019-09-20 2020-11-03 Navid Hakimi Training and aiming device for cue sports
US10874932B1 (en) * 2019-09-26 2020-12-29 Balance Bike, LLC Batting tee targeting apparatus

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US4688796A (en) * 1983-11-22 1987-08-25 Fred Wright Aiming system for billiards
US5181718A (en) * 1991-12-05 1993-01-26 Valentine Douglas H Pool stick apparatus
US5275398A (en) * 1992-12-07 1994-01-04 Compton Kenneth C Apparatus for pool and billiard games
US5554075A (en) * 1996-01-22 1996-09-10 Glazer; Gabriel I. Pool cue alignment device
US5738595A (en) * 1995-10-16 1998-04-14 Carney; William P. Laser aiming device
US6769992B1 (en) * 2002-11-18 2004-08-03 Mark D. Domulevicz Assembly and method for cut shooting a pool ball
US7118486B2 (en) * 2004-05-10 2006-10-10 Evers Edward E Laser light aiming trainer for the game of pool and similar games
US7147566B2 (en) * 2003-11-07 2006-12-12 Jeffrey Alan Keating Cue sports training device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4688796A (en) * 1983-11-22 1987-08-25 Fred Wright Aiming system for billiards
US5181718A (en) * 1991-12-05 1993-01-26 Valentine Douglas H Pool stick apparatus
US5275398A (en) * 1992-12-07 1994-01-04 Compton Kenneth C Apparatus for pool and billiard games
US5738595A (en) * 1995-10-16 1998-04-14 Carney; William P. Laser aiming device
US5554075A (en) * 1996-01-22 1996-09-10 Glazer; Gabriel I. Pool cue alignment device
US6769992B1 (en) * 2002-11-18 2004-08-03 Mark D. Domulevicz Assembly and method for cut shooting a pool ball
US7147566B2 (en) * 2003-11-07 2006-12-12 Jeffrey Alan Keating Cue sports training device
US7118486B2 (en) * 2004-05-10 2006-10-10 Evers Edward E Laser light aiming trainer for the game of pool and similar games

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7611416B1 (en) * 2007-05-18 2009-11-03 Mattina Anthony J Cue stick apparatus and method
US20090143156A1 (en) * 2007-12-03 2009-06-04 Ted Walter Schulze Pool cue training device
US20100040376A1 (en) * 2008-08-15 2010-02-18 Chun-Yi Lin Receiver
US20110070959A1 (en) * 2009-09-18 2011-03-24 Wylie Jill M Clip/fastener with wheel, ball bearing, or roller device or apparatus: Junior shark guiding wheel
KR101581594B1 (en) * 2014-12-17 2016-01-11 전북대학교산학협력단 Real time billiard assistant system
WO2019112190A1 (en) * 2017-12-07 2019-06-13 박철훈 Thickness checking pointer for billiard practice
KR101894082B1 (en) * 2017-12-07 2018-08-31 박철훈 Thickness check pointer for billiard practice
KR20190069110A (en) * 2017-12-11 2019-06-19 박철훈 Hitting point display pointer for billiard practice
KR102021074B1 (en) * 2017-12-11 2019-09-11 박철훈 Hitting point display pointer for billiard practice
KR101966789B1 (en) * 2018-07-06 2019-04-08 박철훈 Billiard pointer for checking the thickness and supporting the cue stick
WO2020009471A1 (en) * 2018-07-06 2020-01-09 박철훈 Billiards pointer for checking thickness and supporting cue
JP2021528218A (en) * 2018-07-06 2021-10-21 ゴー キュー インコーポレーテッドＧｏ Ｃｕｅ Ｉｎｃ． Billiard pointer for thickness confirmation and cue support
EP3819010A4 (en) * 2018-07-06 2022-03-30 Go Cue Inc. Billiards pointer for checking thickness and supporting cue
WO2020085725A1 (en) * 2018-10-25 2020-04-30 에이에스케이 주식회사 Billiards pointer device for providing information about thickness and contact points
US10821349B1 (en) * 2019-09-20 2020-11-03 Navid Hakimi Training and aiming device for cue sports
US10874932B1 (en) * 2019-09-26 2020-12-29 Balance Bike, LLC Batting tee targeting apparatus
CN111228779A (en) * 2020-02-11 2020-06-05 王永辉 Method and mechanism for aiming, calculating and indicating thickness of cut ball and billiard posture adjusting device

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