阅读说明：本技术 可降低击球偏曲率的台球杆前肢 (Billiard cue forelimb capable of reducing deflection of hitting ball ) 是由 张荣士 于 2020-08-05 设计创作，主要内容包括：本发明公开了一种可降低击球偏曲率的台球杆前肢,包含一前肢本体,该前肢本体具有一平直段以及一推拔段,该平直段具有相同的第一外径,该推拔段的外径是自该平直段的末端沿该前肢本体的底端渐增。该前肢本体包含有一木质杆体以及一具有预定厚度的纤维补强塑料(FRP)外层。该木质杆体包含有一轴孔,该轴孔具有一预定深度及一预定内径。因此,该台球杆前肢不但可降低击球时的偏曲率,还可解决木质材料受潮弯曲变形以及受碰撞凹陷的问题。(The invention discloses a billiard cue forelimb capable of reducing deflection curvature of a hitting ball, which comprises a forelimb body, wherein the forelimb body is provided with a straight section and a pushing section, the straight section is provided with the same first outer diameter, and the outer diameter of the pushing section is gradually increased from the tail end of the straight section along the bottom end of the forelimb body. The forelimb body comprises a wooden rod body and a Fiber Reinforced Plastic (FRP) outer layer with a predetermined thickness. The wooden rod body comprises a shaft hole, and the shaft hole is provided with a preset depth and a preset inner diameter. Therefore, the billiard cue forelimb not only can reduce the deflection rate when hitting balls, but also can solve the problems that the wooden material is damped, bent and deformed and is sunk by collision.)

1. A cue stick forelimb comprising:

a forelimb body having a top end, a bottom end, a long axis and a first length extending from the top end to the bottom end along the long axis;

the forelimb body comprises a straight section and a pushing section; the straight section extends from the top end of the forelimb body to the bottom end along the long axis for a second length and has the same first outer diameter; the pushing and pulling section extends from the tail end of the flat section to the bottom end of the forelimb body, and the outer diameter of the pushing and pulling section is gradually increased from the tail end of the flat section along the bottom end of the forelimb body;

the forelimb body also comprises a wooden rod body and a Fiber Reinforced Plastic (FRP) outer layer with a preset thickness, and the surface of the wooden rod body is coated with the FRP outer layer;

the wooden rod body comprises a shaft hole, and the shaft hole extends to a preset depth along the long axis to the bottom end of the front limb body in a mode of having a preset inner diameter;

the predetermined depth of the axial hole is between 15% and 55% along the first length; and

the predetermined inner diameter of the shaft hole is between 51% and 81% of the first outer diameter.

2. A cue stick forelimb according to claim 1 wherein the outer Fiber Reinforced Plastic (FRP) layer comprises fiberglass pre-impregnated with epoxy.

3. A cue stick front leg according to claim 1, wherein the predetermined depth of the shaft hole is equal to or less than the second length.

4. A cue stick front leg according to claim 1, wherein the second length is between 31% and 54% of the first length.

5. A cue stick front leg according to claim 4, wherein the first length is between 711mm to 813 mm.

6. A cue stick forelimb according to claim 5 wherein the first length is 737 mm.

7. A cue stick front leg according to claim 6 wherein the second length is 394 mm.

8. A cue stick front leg according to claim 7, wherein the predetermined depth of the shaft hole is 370 mm.

9. A cue stick front leg according to claim 5, wherein the first outer diameter is between 10.5mm and 13.5 mm.

10. A cue stick front leg according to claim 9, wherein the predetermined inner diameter of the shaft hole is between 5.36mm and 10.94 mm.

11. A cue stick front leg according to claim 9, wherein the first outer diameter is 12.75 mm.

12. A cue stick front leg according to claim 9, wherein the predetermined internal diameter of the shaft hole is 8.50 mm.

13. A cue stick forelimb according to claim 9 wherein the outer layer of Fiber Reinforced Plastic (FRP) has a thickness of between 3.6% and 5.8% of the first outer diameter.

14. A cue stick forelimb according to claim 13 wherein the outer layer of Fibre Reinforced Plastic (FRP) is 0.74mm thick.

15. A cue stick front leg according to claim 5, wherein the cue stick front leg weighs between 96 grams and 120 grams.

16. A cue stick front leg as in claim 15 wherein the cue stick front leg weighs 106 grams.

Technical Field

The invention relates to the field of billiard sticks, in particular to a billiard stick forelimb capable of reducing the deflection rate of hitting balls.

Background

The billiard cue generally used at present is generally formed by assembling a forelimb (Shaft) and a rear handle (Butt), and as is well known, the forelimb made of natural wood material is popular with most of the players due to moderate weight and elasticity, but the forelimb of the wood billiard cue is easy to be damped, bent and deformed, the surface is easy to be sunken when being collided, the hardness cannot be adjusted and the like, so that the hitting accuracy is reduced.

To improve the above-mentioned deficiency of the conventional wood cue front leg, the U.S. patent No. 5,725,4375 discloses an improved wood cue front leg having a ferrule (ferule) with better compressibility than the cue front leg disposed at the front end of the cue front leg, and a recessed hole disposed at the front end of the cue front leg, so that on one hand, a part of the impact force during the impact can be absorbed by the ferrule, and on the other hand, the weight of the cue front leg front end can be reduced by the recessed hole, and thus the improved cue front leg can hit the ball with better accuracy than the conventional wood cue front leg. The wooden cue stick forelimb disclosed in this patent is not practical in nature because the more compressible ferrule is not easily controlled in manufacture. Furthermore, the diameter of the concave hole is large and the depth is large to achieve the purpose of reducing the weight of the front end of the front leg of the billiard cue, and the patent does not suggest or suggest any teaching. Moreover, the improved wood cue front leg cannot solve the problems of bending deformation when being affected with damp and sinking when being affected with collision.

In addition, U.S. patent No. 6,110,051 discloses another improved cue stick front leg made of fiber reinforced plastic (a composite material of fibers in a binder), which is characterized by a concave hole at the front end of the leg, so that the cue stick front leg has sufficient rigidity on one hand, and the weight of the cue stick front leg front end can be reduced on the other hand. Thus, the cue stick front leg disclosed in U.S. Pat. No. 6,110,051 not only increases the accuracy of the shot, but also improves the lack of the cue stick front leg disclosed in U.S. Pat. No. 5,725,4375. Nonetheless, the cue stick forelimb disclosed in U.S. patent 6,110,051 is not ideal for practical use because the cue stick forelimb made of fiber reinforced plastic is not as effective in absorbing impact forces at impact as a cue stick forelimb made of natural wood material. Therefore, the billiard cue forelimb has the advantages of a wood material, cannot bend and deform when being wetted, cannot sag when being collided, and can reduce the deflection curvature of the hitting ball is to be researched.

Disclosure of Invention

Accordingly, it is a primary object of the present invention to provide a cue stick front leg that not only has the advantages of wood material, but also solves the problems of bending due to moisture and impact depression.

It is another object of the present invention to provide a cue stick forelimb having a suitable resilience such that when the ball striking point is offset from the center of the cue ball, the appropriate resilience compensates for the rate of deviation of the actual path of the cue ball from the intended path of the cue ball, i.e. reduces the off-curvature of the cue ball when striking the ball.

It is a further object of the present invention to provide a cue stick forelimb having a body with suitable resilience and weight.

It is yet another object of the present invention to provide a cue stick forelimb that allows the user to smoothly and stably ride the stick body on the bridge when hitting a ball.

Accordingly, to achieve the above objects, the front leg of the cue stick of the present invention comprises a front leg body having a top end, a bottom end, a long axis and a first length extending from the top end to the bottom end along the long axis. The forelimb body comprises a straight section and a pushing section, wherein the straight section extends from the top end of the forelimb body to the bottom end along the long axis by a second length and has the same first outer diameter. The pushing section extends from the end of the flat section to the bottom end of the forelimb body, and the outer diameter of the pushing section is gradually increased from the end of the flat section along the bottom end of the forelimb body. The forelimb body also comprises a wooden rod body and a Fiber Reinforced Plastic (FRP) outer layer with a preset thickness, and the surface of the wooden rod body is coated with the FRP outer layer. The wooden rod body comprises a shaft hole, and the shaft hole is provided with a preset depth and a preset inner diameter. The predetermined depth of the axial hole extends along the top end of the front limb body along the long axis to the bottom end and is between 15% and 55% of the first length. The predetermined inner diameter of the shaft hole is between 51% and 81% of the first outer diameter. Therefore, when the front leg of the billiard cue is used for hitting balls, a user can stably run the billiard cue on the hand bridge by virtue of the straight section, so that the accuracy of hitting the balls is improved. The cue stick forelimb of the present invention, in addition to having the straight section, also has the shaft bore of predetermined internal diameter and depth, which on the one hand provides a moderate weight reduction of the cue stick forelimb tip section, herein referred to as a moderate weight reduction, in the sense that it cannot be inferred that the larger the internal diameter or depth of the shaft bore, the better, because if the weight is reduced too much, the forelimb cannot produce the proper impact force. On the other hand, the shaft hole with the predetermined inner diameter and depth can make the cue stick forelimb have proper elasticity so as to generate proper bending when the cue stick forelimb impacts the cue ball at the top end, and through the bending phenomenon, when the ball hitting point deviates from the center of the cue ball, the situation that the cue ball deviates from the expected travelling route can be improved to a certain extent, namely, the deviated curvature of the cue stick when hitting the ball can be reduced. The shaft hole of a predetermined depth of inner diameter as described herein provides the cue stick forelimb with appropriate resilience, and it is also not possible to infer therefrom that a larger inner diameter or depth of the shaft hole is better, since if too much resilience would be counter productive. Furthermore, it should be noted that, since the surface of the wood body of the front leg of the cue stick of the present invention is covered with a layer of Fiber Reinforced Plastic (FRP) with a proper thickness, on one hand, the advantages of the wood material can be maintained, and on the other hand, the problems of bending deformation and sinking when the wood material is affected by damp and collision can be solved.

A preferred embodiment of the cue stick forelimb of the present invention is that the outer Fiber Reinforced Plastic (FRP) layer comprises fiberglass pre-impregnated with epoxy resin.

One of the features of the cue stick forelimb provided by the present invention is that the thickness of the outer layer of Fiber Reinforced Plastic (FRP) is between 3.6% and 5.8% of the first outer diameter.

Yet another feature of the cue stick forelimb provided by the present invention is that the outer diameter of the straight section, i.e. the first outer diameter, is between 10.5mm and 13.5 mm.

Another feature of the cue stick forelimb provided by the present invention is that it weighs between 96 grams and 120 grams.

Yet another feature of the cue stick front leg of the present invention is the length of the front leg body, i.e., the first length, is between 711mm and 813 mm.

Yet another feature of the cue stick forelimb of the present invention is the length of the straight section of the forelimb body, i.e., the second length is between 31% and 54% of the first length.

Yet another feature of the cue stick forelimb provided by the present invention is that the predetermined inner diameter of the shaft hole is between 5.36mm and 10.94 mm.

It is still another feature of the cue stick forelimb provided by the present invention that the predetermined depth of the shaft hole can be equal to or less than the length of the straight section of the forelimb body, i.e., the second length.

Drawings

FIG. 1 schematically illustrates a side view of a complete cue stick of an embodiment of the invention, the front leg of the cue stick being a preferred embodiment of the invention;

FIG. 2 schematically illustrates a cross-sectional view of the front limb body of a cue stick front limb of an embodiment of the present invention taken along the direction 2-2 of FIG. 1;

FIG. 3 schematically illustrates a cross-sectional view of an embodiment of the present invention taken along the direction 3-3 of FIG. 2;

FIG. 4 schematically illustrates a cross-sectional view of an embodiment of the present invention taken along the direction 4-4 of FIG. 2;

FIG. 5 is a schematic illustration of one method of measuring the amount of elastic deformation of the embodiment of the invention shown in FIG. 1 when a force is applied thereto, in practice;

FIG. 6 is a vector exploded view schematically illustrating how the actual path of the cue ball will deviate from the intended path by an angle θ and the force applied when the ball is struck by the front leg of a prior art cue stick with the point of impact right of the cue ball center; and

fig. 7 schematically illustrates a vector exploded view of the forces and travel of a cue ball away from the intended line of action by a minimum angle when the ball is struck with the front leg of a cue stick according to an embodiment of the invention, with the point of impact to the right of the center of the cue ball.

Detailed Description

In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.

Referring first to fig. 1 to 4, wherein the number 100 is a complete cue, the cue 100 is composed of a front leg 10 and a rear handle 12, the front leg 10 and the rear handle 12 are fixed together in the prior art, in this embodiment, the front leg 10 is screwed with the rear handle 12 through a screw assembly 13, in addition, a ferrule 14 and a hitting mat 15 are fixed to the top end of the front leg 10, and a cushion 16 is fixed to the end of the rear handle 12.

The forelimb 10 includes a forelimb body 20, the forelimb body 20 having a top end 22, a bottom end 24, a longitudinal axis X-X', and a first length L extending from the top end 22 to the bottom end 24 along the longitudinal axis₁. The first length L₁Typically between about 711mm and 813mm and preferably the first length is about 737 mm.

According to the present invention, the front limb body 20 further has a straight section 26 and a tapered section 28, the straight section 26 extends from the top end 22 of the front limb body 20 to the bottom end 24 along the long axis X-X 'to a line a-a'. The straight section 26 allows the user to smoothly and stably run the club body on the bridge for increasing the accuracy of hitting the ball. Generally, the straight section 26 has a first outer diameter D₁And a second length L₂. A first outer diameter D of the straight section 26₁May be between 10.5mm and 13.5mm, and in the present embodiment, the first outer diameter D₁About 12.75 mm. The second length L₂May be generally between the first length L₁Between 31% and 54%, in the present embodiment, the second length L₂About 394 mm. The tapered section 28 has an outer diameter that increases from its initial end (i.e., the line a-a') along the bottom end 24 of the forelimb body 20.

The forelimb body 20 comprises a wooden rod 30 and a Fiber Reinforced Plastic (FRP) outer layer 40 with a predetermined thickness covering the surface of the wooden rod 30. The wooden pole 30 is typically made of maple or ash. The wooden stick body 30 has a shaft hole 32, and the shaft hole 32 has a predetermined inner diameter D₂From the top end 22 alongThe long axis X-X' extends to a predetermined depth H toward the bottom end 24₁. The depth and inner diameter of the axial hole 32 must be properly matched to provide proper elasticity to the front section of the front limb body 20 and to properly reduce the weight of the front limb body 20. Generally, the depth H of the axial bore 32₁Is between the first length L₁Between 15% and 55%, in the present embodiment, the depth H of the axial hole 32₁Approximately 370 mm. In addition, the depth H of the axial hole 32 is set here₁Can be designed to be less than the length L of the straight section 26 of the forelimb body 20₂To give the front end portion of the cue stick tip 10 a suitable resilience, since if too much resilience is available it may have an adverse effect. The inner diameter D of the shaft hole 32₂Is matched with the first outer diameter D of the straight section 26₁The inner diameter D of the axial bore 32 is designed to be generally the same as the inner diameter D of the axial bore₂About the first outer diameter D of the straight section 26₁If the outer diameter D of the straight section 26 is between 51% and 81%₁Between 10.5mm and 13.5mm, the inner diameter D of the shaft hole 32₂Between about 5.36mm and 10.94 mm. In the present embodiment, the inner diameter D of the axial hole 32₂About 8.50 mm.

In addition, the Fiber Reinforced Plastic (FRP) outer layer 40 has a predetermined thickness T₁The surface of the wood rod 30 is completely covered with the Fiber Reinforced Plastic (FRP) outer layer 40, which is made of carbon fiber or glass fiber composite material pre-impregnated with epoxy resin, to prevent the wood rod 30 from bending and deforming when being wetted and from sinking when being collided. In addition, in order not to affect the elasticity of the forelimb 20, a fiberglass composite material pre-impregnated with epoxy resin is generally selected. Of course, to achieve the above-mentioned purpose, the thickness T of the Fiber Reinforced Plastic (FRP) outer layer 40₁Must also be properly controlled and is generally sized to conform to the first outer diameter D of the straight section 26₁And designing. Generally, the thickness T of the Fiber Reinforced Plastic (FRP) outer layer 40₁Between about 3.6% and 5.8% of the outer diameter of the straight section 26 when the outer diameter D of the straight section 26 is larger than₁The thickness T of the Fiber Reinforced Plastic (FRP) outer layer is between 10.5mm and 13.5mm₁About between 0Between 38mm and 0.78 mm. In this embodiment, the thickness T of the Fiber Reinforced Plastic (FRP) outer layer 40₁About 0.74mm. Generally, the cue stick front leg 10 weighs between about 96 grams and about 120 grams, and in this embodiment, the cue stick front leg 10 weighs about 106 grams.

Finally, referring to fig. 5 to 7, fig. 5 schematically illustrates a method for measuring the front leg elasticity of a cue according to an embodiment of the present invention. During measurement, a cue stick front limb 10 to be measured is firstly fixed on a supporting device S, then two supporting points S1 and S2 with the span of 500mm and a pressing point P located at the center of the two supporting points are selected from the front end 22 of the cue stick front limb 10, and then a pressing device M is used for pressing the cue stick front limb 10 at the pressing point P with the advancing speed of 10mm/min and the pressure of 22lb so as to obtain the deformation of the cue stick front limb 10. The prior art solid wood cue 80 measured this way to a deflection of 0.313 inches. The club forelimb 10 of the present invention has a deflection of 0.338 inches when the straight section 26 has a length of 394mm, the shaft hole 32 has a depth of 280mm, and the inner diameter is 8.5 mm. The club forelimb 10 of the present invention has a deflection of 0.361 inch when the straight section 26 has a length of 394mm, the shaft hole 30 has a depth of 370mm, and the inner diameter is 8.5 mm. The amount of deformation will provide the cue stick forelimb 10 with appropriate resilience to reduce the deflection rate during impact, as will be described below with reference to fig. 6 and 7.

FIG. 6 schematically illustrates a prior art solid wood cue stick 80 for striking a cue ball 90, the ball striking point 82 being offset to the right of the center 92 of the cue ball 90 by a predetermined distance d, the cue stick 80 generating an impact force F at the ball striking point 82 according to general mechanics principles₀Is formed by a vertical component F₀₁And a horizontal component F₀₂The resultant horizontal component force F is due to the poor resilience of the prior art wood cue 80₀₂An influence on the traveling path of the cue ball 90, i.e., the actual traveling path P of the cue ball 90₁Will deviate from the predetermined course P₀Theta₀And (4) an angle.

FIG. 7 schematically illustrates a cue stick front leg 10 of an embodiment of the present invention used to strike a cue ball 90, as well asSimilarly, the striking point 82 is offset to the right of the center 92 of the cue ball 90 by a predetermined distance d, so that the club forelimb 10 also generates a striking force F at the striking point 82₀. Because of the appropriate resilience of the front portion of the cue stick forelimb 10, the front end, particularly the straight section 26, will experience an appropriate curvature upon impact, which curvature has been found to impart an impact force F on the cue ball 90 in the other direction as shown_rAnd the impact force F_rIs formed by a vertical component F_r1And a horizontal component F_r2Synthesized so that the horizontal component force F_r2Just can counteract the impact force F₀Horizontal component force F₀₂And thus the actual travel path P of the cue ball 90₂Deviation from a predetermined path of travel P₀Angle of theta₁Will be less than theta₀。

The foregoing description of the preferred embodiment of the invention with respect to the purpose, solution and benefits of the invention shall be understood to be illustrative only, and not limiting, and it is intended to cover within the spirit and principles of the invention any modification, equivalent substitution, modification, etc. made within the scope of the invention.