US20060201490A1 - Method of converting baseball pitching machine to pitch lacrosse balls - Google Patents
Method of converting baseball pitching machine to pitch lacrosse balls Download PDFInfo
- Publication number
- US20060201490A1 US20060201490A1 US11/076,126 US7612605A US2006201490A1 US 20060201490 A1 US20060201490 A1 US 20060201490A1 US 7612605 A US7612605 A US 7612605A US 2006201490 A1 US2006201490 A1 US 2006201490A1
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- compression space
- pitching machine
- compression
- inches
- baseball
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
- F41B4/00—Friction-wheel operated launchers
Definitions
- This invention relates to machines for pitching lacrosse balls.
- Baseball pitching devices are well known in the art. These devices generally utilize a rotating drive wheel and a pressure plate spaced apart a distance smaller than a baseball. A baseball fed into the space between the drive wheel and pressure plate is tightly squeezed between the two and propelled forward.
- Another version of this genre of baseball pitching machines has an additional drive wheel replacing the pressure plate. Because the baseball is driven by two wheels, faster ball speeds are obtained.
- a method of converting a baseball pitching machine to a lacrosse ball pitching machine comprising the steps of obtaining a baseball pitching machine having a drive wheel and a compression plate spaced by a compression space therefrom, reducing the size of the compression space to an extent effective in propelling a lacrosse ball, and elevating the pitching machine so as to raise the compression space to a height of at least 70 inches above ground level.
- a method of converting a baseball pitching machine to a lacrosse ball pitching machine comprising the steps of obtaining a baseball pitching machine having a drive wheel and a compression plate spaced by a compression space therefrom, and reducing the size of the compression space by about 68%.
- a conversion kit for converting a baseball pitching machine to a lacrosse ball pitching machine including a replacement compression plate that, when installed, reduces a compression space between a drive wheel of the pitching machine and a replaced compression plate to an extent effective in propelling a lacrosse ball.
- FIG. 1 is a front-plan view of the converted baseball pitching machine of the invention.
- FIG. 2 is a rear-plan view of the invention.
- FIG. 3 is a side-plan view of the invention, showing the opening to the feed tube.
- FIG. 4 is a side-plan view of the invention showing where the ball is ejected from.
- a lacrosse-modified pitching device 1 originally designed to pitch baseballs, now modified to pitch lacrosse balls.
- the basic components include a drive wheel 2 driven about a drive axis 2 b and having a compressible outer rim 2 a .
- the compressible outer rim 2 a is spaced by a compression space 3 from a compression plate 4 , which itself will also generally have a compression pad 4 a .
- a feed tube 5 slightly larger than the diameter of the lacrosse ball 6 to be pitched, is utilized to direct the ball into the compression space 3 .
- the compressible outer rim 2 a and the compression pad 4 a will typically be made of a resilient material such as rubber or polymer plastic. Note, however, that it is not unusual for the compressible outer rim 2 a and compression pad 4 a to be made of different materials and have different resiliencies. Often the compressible out rim 2 a is made of a harder material than the compression pad 4 a.
- the lacrosse ball 6 is fed into the feed tube 5 causing it to enter the compression space 3 .
- the drive wheel 2 rotating rapidly counterclockwise in this view, drives the lacrosse ball 6 through and out the compression space 3 , thereby pitching the lacrosse ball 6 .
- additional components include a tripod receptacle 7 , a swivel joint 8 for aiming the assembly horizontally, a tilt joint 9 for aiming the assembly vertically. Levered tightening screws 10 are provided to locking these joints into place.
- the tripod receptacle 7 is generally three or more hollow pipe members sized to receive supporting legs. As will be more fully explained below, a set of replacement legs 15 will preferably be provided as part of the modification method.
- a drive motor 11 is provided, preferably controlled by a speed controller 12 that has a manual speed control knob 13 or other type of adjustment control.
- a separate on/off switch may be provided on the speed controller 12 , but generally it is more economical to have an “off” position on the speed control knob 13 .
- a carrying handle 14 and a mud flap 17 there is also often provided a carrying handle 14 and a mud flap 17 .
- the mud flap 17 allows use of the invention 1 in rainy weather by preventing water on the drive wheel 2 from spinning onto the person or device feeding lacrosse balls 6 into the feed tube 5 .
- a motor shield 18 is also often provided to prevent balls thrown or batted back toward the machine from striking the motor 11 and speed controller 12 .
- NCA National Collegiate Athletic Association
- the diameter is 3 inches and the coefficient of restitution is no more than 0.555.
- the diameter is 2.5 inches and the coefficient of restitution is no more than 0.842. Both balls weigh from 5 to 5.25 ounces.
- the coefficient of restitution is a measure of the resiliency of the ball.
- the problem for the modifier of a baseball machine for use with a lacrosse ball is that the compressibility of the compressible rim 2 a of the drive wheel 2 and the compressibility of the compression pad 4 a (if any) of the compression plate 4 will vary among manufacturers and models, therefore the compression space 3 required for a lacrosse ball will vary.
- compression strength is proportional to compression space 3 to good approximation, we can reasonably rely on the standardization of baseballs and lacrosse balls by the NCAA to determine the modified compression space 3 without undue experimentation.
- the original compression space 3 will generally be reduced from 60% to 80%, preferably about 68%, of its original size to modify a baseball pitching machine to pitch lacrosse balls.
- G B is the compression space width for the hardball
- G L is the compression space width for the lacrosse ball
- D B is the diameter of the hardball
- D L is the diameter of the lacrosse ball
- F is the compression force exerted upon the balls when in the compression space
- the equation assumes the hardball to be incompressible.
- the factor ⁇ is any additional force that may be desired, such as to compensate for the smoother and lower frictional surface of a lacrosse ball in comparison to a hardball.
- the modified baseball pitching machine shown in the drawings is sold by Bata Baseball Machines of San Marcos, Calif. under the product model name of BATA-1.
- the compression space 3 for an NCAA standard hardball baseball is 2.21 inches. Taking 68% of this, we obtain a compression space 3 of 1.5 inches for an NCAA standard lacrosse ball. Alternatively, we could reduce the value of 2.21 inches by 0.71 and obtain the same result of 1.5 inches.
- the compression space 3 where the ball is ejected, is typically about 40 to 50 inches above ground level on the typical baseball pitching machine.
- the compression space 3 be at a height above ground of from about 70 to 90 inches, or about 80 inches.
- the BATA-1 model shown in the drawings comes with 34-inch pipe legs that fit into the tripod receptacle 7 , yielding a compression space 3 height of about 48 inches.
- By replacing these with 68-inch replacement legs 15 we obtain a compression space 3 height of about 78 inches. Again, these replacement legs 15 may be supplied as part of a conversion kit for the consumer.
- the third most important modification to the original baseball pitching machine is in the feed tube 5 .
- this step may or may not be necessary.
- the original feed tube 16 shown in dotted outline, on the model BATA-1 is level with an inside diameter large enough to accommodate a 3-inch diameter hardball with room to spare. Further, the tube does not extend very close to the compression space 3 .
- the lacrosse-modified feed tube 5 of the invention has a smaller inside diameter of about three inches to accommodate a 2.5-inch lacrosse ball with half-an-inch to spare. It is preferably tilted downward into the compression space 3 at an angle of from 10° to 20°, preferably about 15°. Note that this angle is in relation to the compression space itself rather than the ground because the device can be tilted. This allows the device to be tilted upward to duplicate the loft normally associated with lacrosse balls when thrown and still permit balls to be fed into the tube without rolling back out. Further, the feed tube 5 is preferably brought in very close to the compression space 3 .
- the feed tube 5 of the invention may be provided to the consumer as a replacement part in a conversion kit, requiring only that the original feed tube 16 be discarded and replaced.
Abstract
Disclosed is a method of converting a baseball pitching machine to a lacrosse ball pitching machine by obtaining a baseball pitching machine having a drive wheel and a compression plate spaced by a compression space 3 therefrom, reducing the size of the compression space 3 to an extent effective in propelling a lacrosse ball, and elevating the pitching machine so as to raise the compression space 3 to a height of at least 70 inches above ground level.
Description
- 1. Field of the Disclosure
- This invention relates to machines for pitching lacrosse balls.
- 2. Description of the Related Art
- Baseball pitching devices are well known in the art. These devices generally utilize a rotating drive wheel and a pressure plate spaced apart a distance smaller than a baseball. A baseball fed into the space between the drive wheel and pressure plate is tightly squeezed between the two and propelled forward.
- Another version of this genre of baseball pitching machines has an additional drive wheel replacing the pressure plate. Because the baseball is driven by two wheels, faster ball speeds are obtained.
- One might simply design a similar device for pitching lacrosse balls, but what is needed is a more economical method that permits a pre-existing baseball pitching device to be converted to a lacrosse ball pitching device, thereby obviating the need for retooling.
- Disclosed is a method of converting a baseball pitching machine to a lacrosse ball pitching machine, comprising the steps of obtaining a baseball pitching machine having a drive wheel and a compression plate spaced by a compression space therefrom, reducing the size of the compression space to an extent effective in propelling a lacrosse ball, and elevating the pitching machine so as to raise the compression space to a height of at least 70 inches above ground level.
- Disclosed is a method of converting a baseball pitching machine to a lacrosse ball pitching machine, comprising the steps of obtaining a baseball pitching machine having a drive wheel and a compression plate spaced by a compression space therefrom, and reducing the size of the compression space by about 68%.
- Also disclosed is a conversion kit for converting a baseball pitching machine to a lacrosse ball pitching machine, the kit including a replacement compression plate that, when installed, reduces a compression space between a drive wheel of the pitching machine and a replaced compression plate to an extent effective in propelling a lacrosse ball.
-
FIG. 1 is a front-plan view of the converted baseball pitching machine of the invention. -
FIG. 2 is a rear-plan view of the invention. -
FIG. 3 is a side-plan view of the invention, showing the opening to the feed tube. -
FIG. 4 is a side-plan view of the invention showing where the ball is ejected from. - Referring to
FIG. 1 in particular and the remaining figures in general, there is shown a lacrosse-modifiedpitching device 1, originally designed to pitch baseballs, now modified to pitch lacrosse balls. The basic components include adrive wheel 2 driven about adrive axis 2 b and having a compressibleouter rim 2 a. The compressibleouter rim 2 a is spaced by acompression space 3 from acompression plate 4, which itself will also generally have acompression pad 4 a. Afeed tube 5, slightly larger than the diameter of thelacrosse ball 6 to be pitched, is utilized to direct the ball into thecompression space 3. - The compressible
outer rim 2 a and thecompression pad 4 a will typically be made of a resilient material such as rubber or polymer plastic. Note, however, that it is not unusual for the compressibleouter rim 2 a andcompression pad 4 a to be made of different materials and have different resiliencies. Often the compressible outrim 2 a is made of a harder material than thecompression pad 4 a. - As can be seen, the
lacrosse ball 6 is fed into thefeed tube 5 causing it to enter thecompression space 3. Thedrive wheel 2, rotating rapidly counterclockwise in this view, drives thelacrosse ball 6 through and out thecompression space 3, thereby pitching thelacrosse ball 6. - Referring more specifically to
FIG. 2 , additional components include atripod receptacle 7, aswivel joint 8 for aiming the assembly horizontally, atilt joint 9 for aiming the assembly vertically. Levered tighteningscrews 10 are provided to locking these joints into place. Thetripod receptacle 7 is generally three or more hollow pipe members sized to receive supporting legs. As will be more fully explained below, a set ofreplacement legs 15 will preferably be provided as part of the modification method. - A
drive motor 11 is provided, preferably controlled by aspeed controller 12 that has a manualspeed control knob 13 or other type of adjustment control. A separate on/off switch may be provided on thespeed controller 12, but generally it is more economical to have an “off” position on thespeed control knob 13. - Referring again to
FIG. 1 in particular and the remaining figures in general, there is also often provided acarrying handle 14 and amud flap 17. Themud flap 17 allows use of theinvention 1 in rainy weather by preventing water on thedrive wheel 2 from spinning onto the person or device feedinglacrosse balls 6 into thefeed tube 5. Amotor shield 18 is also often provided to prevent balls thrown or batted back toward the machine from striking themotor 11 andspeed controller 12. - The most important modification to the original baseball pitching machine is in the
original compression space 3, which must be reduced to be adapted to the size, friction, and resiliency of a lacrosse ball. The National Collegiate Athletic Association (NCAA) sets standards for equipment used in college sports that are typically followed by their professional counterparts. For a baseball, the diameter is 3 inches and the coefficient of restitution is no more than 0.555. For a lacrosse ball, the diameter is 2.5 inches and the coefficient of restitution is no more than 0.842. Both balls weigh from 5 to 5.25 ounces. - The coefficient of restitution, c, of a ball is given by:
where h is the height to which the ball bounces to when dropped from a height of H. The coefficient of restitution is a measure of the resiliency of the ball. - The problem for the modifier of a baseball machine for use with a lacrosse ball is that the compressibility of the
compressible rim 2 a of thedrive wheel 2 and the compressibility of thecompression pad 4 a (if any) of thecompression plate 4 will vary among manufacturers and models, therefore thecompression space 3 required for a lacrosse ball will vary. However, because compression strength is proportional tocompression space 3 to good approximation, we can reasonably rely on the standardization of baseballs and lacrosse balls by the NCAA to determine the modifiedcompression space 3 without undue experimentation. We have found that theoriginal compression space 3 will generally be reduced from 60% to 80%, preferably about 68%, of its original size to modify a baseball pitching machine to pitch lacrosse balls. - More accurately, the equation for the change in compression space distance is approximated by
where GB is the compression space width for the hardball, GL is the compression space width for the lacrosse ball, DB is the diameter of the hardball, DL is the diameter of the lacrosse ball, F is the compression force exerted upon the balls when in the compression space, and KL is the spring coefficient of the lacrosse ball (wherein F=KL·ΔDL, where ΔDL is the change in lacrosse ball diameter caused by force F). The equation assumes the hardball to be incompressible. The factor φ is any additional force that may be desired, such as to compensate for the smoother and lower frictional surface of a lacrosse ball in comparison to a hardball. - Notice from the equation that the difference in compression space distance is independent of the resiliency of the
compressible rim 2 a andcompression pad 4 a and is simply the difference in ball size plus a constant, F/KL, which will generally be from 0.15 to 0.25 or about 0.21. Hence, for any system, one may generally maintain the same compression force in conversion to lacrosse ball use by reducing the compression space by about 0.5+0.21=0.71 inches. - For example, the modified baseball pitching machine shown in the drawings is sold by Bata Baseball Machines of San Marcos, Calif. under the product model name of BATA-1. The
compression space 3 for an NCAA standard hardball baseball is 2.21 inches. Taking 68% of this, we obtain acompression space 3 of 1.5 inches for an NCAA standard lacrosse ball. Alternatively, we could reduce the value of 2.21 inches by 0.71 and obtain the same result of 1.5 inches. - Hence, for any particular make or model of machine, we need not know the compression strength of the
compression pad 4 a orcompressible rim 2 a and engage in complex calculation or experiment. This is because the manufacturer has already set theoriginal compression space 3 size for us for optimal use with a standardized baseball. We need only take 68% of this value to reasonably adapt to a lacrosse ball. Note that the diameter of an NCAA standard lacrosse ball is only 83% of an NCAA standard hardball, but we must reduce thecompression space 3 still further because a lacrosse ball is more resilient and has a less frictional surface than a hardball. Of course, there may be other factors involved, depending on machine design, so that one might wish to take 68% as an initial approximation and then fine-tune thecompression space 3 with minimal experimentation. - How the modification in
compression space 3 is made is most simply achieved by either drilling new mountingholes 4 b in thecompression plate 4 supplied with the baseball pitching machine, or by supplying areplacement compression plate 4 with mounting holes that will provide the desiredcompression space 3 for lacrosse balls. Such a new plate could be supplied as part of a conversion kit, thereby alleviating the need for a customer to machine any parts. - The next most important modification to the original baseball pitching machine is in the height. Lacrosse balls are mostly thrown high with lacrosse sticks, so the lacrosse-modified
pitching machine 1 needs to be much higher. Thecompression space 3, where the ball is ejected, is typically about 40 to 50 inches above ground level on the typical baseball pitching machine. For a lacrosse ball, it is preferred that thecompression space 3 be at a height above ground of from about 70 to 90 inches, or about 80 inches. To do this, we preferably choose a model of baseball pitching machine that has removable legs and replace them with longer ones. The BATA-1 model shown in the drawings, for example, comes with 34-inch pipe legs that fit into thetripod receptacle 7, yielding acompression space 3 height of about 48 inches. By replacing these with 68-inch replacement legs 15, we obtain acompression space 3 height of about 78 inches. Again, thesereplacement legs 15 may be supplied as part of a conversion kit for the consumer. - The third most important modification to the original baseball pitching machine is in the
feed tube 5. Depending upon the make and model of the machine this step may or may not be necessary. As can be seen inFIG. 1 , theoriginal feed tube 16, shown in dotted outline, on the model BATA-1 is level with an inside diameter large enough to accommodate a 3-inch diameter hardball with room to spare. Further, the tube does not extend very close to thecompression space 3. - The lacrosse-modified
feed tube 5 of the invention has a smaller inside diameter of about three inches to accommodate a 2.5-inch lacrosse ball with half-an-inch to spare. It is preferably tilted downward into thecompression space 3 at an angle of from 10° to 20°, preferably about 15°. Note that this angle is in relation to the compression space itself rather than the ground because the device can be tilted. This allows the device to be tilted upward to duplicate the loft normally associated with lacrosse balls when thrown and still permit balls to be fed into the tube without rolling back out. Further, thefeed tube 5 is preferably brought in very close to thecompression space 3. Because both thedrive wheel 2 and thecompression plate 4 obstruct access to thecompression space 3, it is desirable to provide a compression plate clearing cut 5 a and a drive wheel clearing cut 5 b on thefeed tube 5 so as to permit the feed tube to be extended right into the opening of thecompression space 3 as shown. Again, thefeed tube 5 of the invention may be provided to the consumer as a replacement part in a conversion kit, requiring only that theoriginal feed tube 16 be discarded and replaced. - Of course, while this disclosure has been directed to modifying a hardball pitching machine, the parameters therein may be modified to convert a softball pitching machine with little experimentation. Such a conversion would of course require a greater reduction in the compression space.
- While various values, scalar and otherwise, may be disclosed herein, it is to be understood that these are not exact values, but rather to be interpreted as “about” such values, unless explicitly stated otherwise. Further, the use of a modifier such as “about” or “approximately” in this specification with respect to any value is not to imply that the absence of such a modifier with respect to another value indicated the latter to be exact.
- Changes and modifications can be made by those skilled in the art to the embodiments as disclosed herein and such examples, illustrations, and theories are for explanatory purposes and are not intended to limit the scope of the claims. Further, the abstract of this disclosure is provided for the sole purpose of complying with the rules requiring an abstract so as to allow a searcher or other reader to quickly ascertain the subject matter of the disclosures contained herein and is submitted with the express understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.
Claims (15)
1. A method of converting a baseball pitching machine to a lacrosse ball pitching machine, comprising the steps of:
obtaining a baseball pitching machine having a drive wheel and a compression plate spaced by a compression space therefrom;
reducing the size of the compression space to an extent effective in propelling a lacrosse ball; and
elevating the pitching machine so as to raise the compression space to a height of at least 70 inches above ground level.
2. The method of claim 1 further comprising the step of providing a feed tube of about 3 inches inside diameter directed downward into close proximity with the compression space.
3. The method of claim 2 wherein the feed tube is directed downward toward the compression space at an angle of at least 10 degrees in relation to the compression space.
4. The method of claim 1 wherein the compression space is reduced by about 68%.
5. The method of claim 1 wherein the compression space is reduced by about 0.71 inches.
6. The device produced by the method of claim 1 .
7. A method of converting a baseball pitching machine to a lacrosse ball pitching machine, comprising the steps of:
obtaining a baseball pitching machine having a drive wheel and a compression plate spaced by a compression space therefrom; and
reducing the size of the compression space by about 68%.
8. The method of claim 8 wherein the compression space is reduced by about 0.71 inches.
9. The method of claim 8 wherein the device is elevated so as to dispose the compression space no less than about 70 inches above ground level.
10. The method of claim 8 further comprising the step of providing a feed tube of about 3 inches inside diameter directed downward into close proximity with the compression space.
11. The method of claim 10 wherein the feed tub is directed toward the compression space at a downward angle of at least 10 degrees in relation to the compression space.
12. A conversion kit for converting a baseball pitching machine to a lacrosse ball pitching machine, comprising:
a replacement compression plate that, when installed, reduces a compression space between a drive wheel of the pitching machine and a replaced compression plate to an extent effective in propelling a lacrosse ball.
13. The conversion kit of claim 12 further comprising:
a set of replacement legs effective in elevating the pitching machine so as to raise the compression space to a height of at least 70 inches above ground level.
14. The conversion kit of claim 12 further comprising a feed tube of about 3 inches inside diameter.
15. The conversion kit of claim 14 further comprising a feed tube of about 3 inches inside diameter.
Priority Applications (1)
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US11/076,126 US20060201490A1 (en) | 2005-03-09 | 2005-03-09 | Method of converting baseball pitching machine to pitch lacrosse balls |
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US11/076,126 US20060201490A1 (en) | 2005-03-09 | 2005-03-09 | Method of converting baseball pitching machine to pitch lacrosse balls |
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US11/076,126 Abandoned US20060201490A1 (en) | 2005-03-09 | 2005-03-09 | Method of converting baseball pitching machine to pitch lacrosse balls |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9579554B1 (en) * | 2015-12-09 | 2017-02-28 | Sports Attack, LLC | System and method to pitch balls using one powered wheel |
CN110546451A (en) * | 2018-04-25 | 2019-12-06 | 深圳市大疆创新科技有限公司 | Bullet supply mechanism, shooting device and robot |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5826568A (en) * | 1997-05-13 | 1998-10-27 | Dallas Metal Fabricators, Inc. | Ball pitching apparatus |
US6305366B1 (en) * | 1999-10-27 | 2001-10-23 | Michael J. Rizzo | Softball/baseball training machine |
US6402640B1 (en) * | 2000-06-08 | 2002-06-11 | Allen R. Stuart | Ball throwing device |
US6406386B1 (en) * | 2000-06-22 | 2002-06-18 | Newgy Industries, Inc. | Ball size adjustment mechanism for table tennis robot |
US6732724B1 (en) * | 2002-11-05 | 2004-05-11 | Jugs, Inc. | Portable ball throwing apparatus |
-
2005
- 2005-03-09 US US11/076,126 patent/US20060201490A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5826568A (en) * | 1997-05-13 | 1998-10-27 | Dallas Metal Fabricators, Inc. | Ball pitching apparatus |
US6305366B1 (en) * | 1999-10-27 | 2001-10-23 | Michael J. Rizzo | Softball/baseball training machine |
US6402640B1 (en) * | 2000-06-08 | 2002-06-11 | Allen R. Stuart | Ball throwing device |
US6406386B1 (en) * | 2000-06-22 | 2002-06-18 | Newgy Industries, Inc. | Ball size adjustment mechanism for table tennis robot |
US6732724B1 (en) * | 2002-11-05 | 2004-05-11 | Jugs, Inc. | Portable ball throwing apparatus |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9579554B1 (en) * | 2015-12-09 | 2017-02-28 | Sports Attack, LLC | System and method to pitch balls using one powered wheel |
CN110546451A (en) * | 2018-04-25 | 2019-12-06 | 深圳市大疆创新科技有限公司 | Bullet supply mechanism, shooting device and robot |
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