Projectile Launching Apparatus

Abstract

A projectile launching apparatus for launching a projectile, such as a pellet, a BB bullet, an arrow, a dart and a paintball includes a linear motion converter driven by a motor, a piston coupled to the linear motion converter and reciprocally movable within a cylinder, a spring assembly and a breech assembly. The piston compresses a gas within the cylinder, after which the compressed gas expands in the barrel of the breech assembly for launching the projectile. Breech assembly includes a breech, a bolt, and bolt barrel cam, which rotate with the gas spring to allow a projectile to enter the breech and then to seal the bolt in the breech before the spring assembly releases its stored energy to launch the projectile.

Claims

1. A projectile launching apparatus, comprising: a power source; a motor electrically connected to the power source; a control circuit configured to control a power supply to the motor from the power source; a cylinder comprising a piston reciprocally movable within the cylinder to define a gas chamber within the cylinder, the gas chamber capable of accommodating gas therein; a barrel cam arrangement driven by the motor, the barrel cam operatively coupled to the piston and configured to cause the piston to reciprocally move within the cylinder; a spring assembly, said spring assembly comprising a spring, a drive shaft, and drive rollers; wherein the spring assembly is coupled to the piston and barrel cam such that when the barrel cam and piston are caused to move reciprocally the spring assembly is energized; wherein the drive shaft and rollers of the spring assembly transmit the torque of the motor to the barrel cam allowing the barrel cam to rotate and to translate linearly to energize the spring assembly, a breech assembly comprising a barrel, a projectile inlet port configured on the barrel, the projectile inlet port adapted to permit a projectile to be received within the barrel, and a bolt; wherein the gas received within the gas chamber is compressed by the piston due to rotation of the barrel cam in a manner such that the compressed gas is released from the gas chamber into the barrel, causing the compressed gas to expand in the barrel thereby causing the projectile to be launched from the barrel.

2. The projectile launching apparatus of claim 1 further comprising a gear reduction mechanism, the gear reduction mechanism capable of transferring a rotational movement of the motor to the barrel cam arrangement.

3. The projectile launching apparatus of claim 1 further comprising a bolt driving mechanism coupled to the bolt for causing the bolt to move between the first position and the second position.

4. The projectile launching apparatus of claim 3, wherein the bolt driving mechanism comprises a bolt spring configured to move the bolt to the first position; and a second cam operatively coupled to barrel cam arrangement to move the bolt to the second position.

5. The projectile launching apparatus of claim 1, further comprising at least one sensor configured to enable the control circuit to determine at least one position of the piston and or cam during an operational cycle of the apparatus.

6. The projectile launching apparatus of claim 1, further comprising a velocity control means coupled to the gas chamber wherein the velocity control means can be adjusted to allow gas to be released from the gas chamber, thereby adjusting the velocity of the projectile.

7. The projectile launching apparatus of claim 1, wherein the spring of the spring assembly comprises at least one of steel, titanium, rubber and urethane.

8. The projectile launching apparatus of claim 1, further comprising a stationary cam follower, whereby the cam follower contacts the barrel cam to force linear movement of the barrel cam as the barrel cam rotates, thereby energizing the spring assembly.

9. The projectile launching apparatus of claim 1, further comprising a one-way clutch, whereby the one-way clutch allows rotation of the barrel cam arrangement in only one direction.

10. The projectile launching apparatus of claim 1, the apparatus further comprising at least one barrel cam and comprising at least one cam follower, said at least one barrel cam further comprising at least one cam track, wherein said at least one of at least one barrel cam and at least one cam track engages with said at least one cam follower.

11. A projectile launching apparatus comprising: a power source; a motor electrically connected to the power source; a cylinder comprising a piston reciprocally movable within the cylinder, the piston defining a gas chamber within the cylinder; a spring assembly, said spring assembly comprising a spring, a drive shaft and drive rollers; a linear motion converter driven by the motor, the linear motion converter operatively coupled to the piston and configured to cause the piston to reciprocally move within the cylinder for compressing the gas within the gas chamber; wherein the drive rollers of the spring assembly transmit the torque of the motor to the linear motion converter allowing the linear motion converter to rotate and to translate linearly to energize the spring assembly; a breech assembly comprising a barrel; a projectile inlet port configured on the barrel, the projectile inlet port adapted to receive a projectile, and a bolt comprising a front portion and a rear portion; wherein the gas received within the gas chamber is compressed by the energized spring assembly; and wherein the compressed gas expanding in the barrel causes the projectile to be launched from the barrel.

12. The projectile launching apparatus of claim 11, wherein the linear motion converter is one of a barrel cam, slider crank arrangement, a rack and pinion arrangement, a lead screw arrangement, and a crankshaft and connecting rod arrangement.

13. The projectile launching apparatus of claim 11, further comprising a gear reduction mechanism, the gear reduction mechanism capable of transferring a rotational movement of the motor to the linear motion converter.

14. The projectile launching apparatus of claim 11, further comprising a bolt driving mechanism coupled to the bolt for causing the bolt to move between the first position and the second position.

15. The projectile launching apparatus of claim 14, wherein the bolt driving mechanism comprises a bolt spring configured to move the bolt to the first position; and a bolt cam operatively coupled to the linear motion converter to move the bolt to the second position.

16. The projectile launching apparatus of claim 15, further comprising at least one sensor configured to enable the control circuit to determine at least one of the position of the piston within the cylinder during a stroke of the linear motion converter and a pre-determined position in the operational cycle of the apparatus.

17. The projectile launching apparatus of claim 11, the apparatus further comprising at least one barrel cam and at least one cam follower, said at least one barrel cam further comprising at least one cam track, wherein said at least one cam track engages with said at least one cam follower.

18. A projectile launching apparatus comprising: a power source; a motor electrically connected to the power source; a control circuit configured to control a power supply to the motor from the power source; a cylinder comprising a piston reciprocally movable within the cylinder to define a gas chamber within the cylinder, the gas chamber capable of accommodating gas therein; a barrel cam arrangement driven by the motor, the barrel cam comprising at least one barrel cam that is operatively coupled to the piston and configured to cause the piston to reciprocally move within the cylinder, said at least one barrel cam comprising at least one cam track; a spring, the spring coupled to the piston and barrel cam such that when the barrel cam and piston are caused to move reciprocally the gas spring is energized; wherein the spring further comprises rollers that transmit the torque of the motor to the at least one barrel cam allowing the at least one barrel cam to rotate and to translate linearly to energize the spring; a breech assembly comprising a barrel, a projectile inlet port configured on the barrel, the projectile inlet port adapted to permit a projectile to be received within the barrel, and a bolt; wherein the gas received within the gas chamber is compressed by the piston due to rotation of the barrel cam in a manner such that the compressed gas is released from the gas chamber into the barrel, causing the compressed gas to expand in the barrel thereby causing the projectile to be launched from the barrel.

19. The projectile launching apparatus of claim 18, the apparatus further comprising at least one barrel cam and at least one cam follower, and the at least one barrel cam further comprising at least one cam track, wherein at least one of at least one barrel cam and at least one cam track engages with at least one of said cam follower.

Description

BRIEF DESCRIPTION OF THE DRAWING FIGURES

[0024] The advantages and features of the present disclosure will become better understood with reference to the following detailed description and claims taken in conjunction with the accompanying drawings, wherein like elements are identified with like symbols, and in which:

[0025] FIG. 1 illustrates an isometric view of a projectile launching apparatus, according to an exemplary embodiment of the present disclosure;

[0026] FIG. 2 illustrates a longitudinal cross-sectional view of a projectile launching apparatus, according to an exemplary embodiment of the present disclosure;

[0027] FIG. 3 illustrates a partial section view of a projectile launching apparatus, according to an exemplary embodiment of the present disclosure;

[0028] FIG. 4 illustrates an isometric and a cross-sectional view of the gas spring, barrel cam and piston configuration, according to an exemplary embodiment of the present disclosure;

[0029] FIG. 5 illustrates a partial isometric view of the operational cycle after release of the piston and firing a projectile, according to an exemplary embodiment of the present disclosure;

[0030] FIG. 6 illustrates a partial isometric view of the operational cycle showing the bolt retracting to allow a projectile to enter the breech, according to an exemplary embodiment of the present disclosure;

[0031] FIG. 7 illustrates a partial isometric view of the operational cycle showing the bolt retracted while the barrel cam is energizing the gas spring, according to an exemplary embodiment of the present disclosure;

[0032] FIG. 8 illustrates a partial isometric view of the operational cycle after a second barrel cam releases the bolt and while the gas spring is fully energized, according to an exemplary embodiment of the present disclosure;

[0033] FIG. 9 illustrates a cross sectional view of FIG. 8, according to an exemplary embodiment of the present disclosure;

[0034] FIG. 10 illustrates the location of the sensor which determines the location of the rotation, according to an exemplary embodiment of the present disclosure;

[0035] FIG. 11 illustrates a longitudinal cross-sectional view of a projectile launching apparatus comprising a spring assembly, according to an exemplary embodiment of the present disclosure;

[0036] FIG. 12 illustrates another longitudinal cross-sectional view of a projectile launching apparatus, according to an exemplary embodiment of the present disclosure;

[0037] FIG. 13 illustrates a longitudinal cross-sectional view of a projectile launching apparatus comprising a plurality of cam tracks and a plurality of cam followers, according to an exemplary embodiment of the present disclosure; and

[0038] FIG. 14 illustrates another longitudinal cross-sectional view of a projectile launching apparatus comprising a plurality of cam tracks and a plurality of cam followers, according to an exemplary embodiment of the present disclosure.

[0039] Like reference numerals refer to like parts throughout the description of several views of the drawings.

DETAILED DESCRIPTION OF THE DISCLOSURE

[0040] The exemplary embodiments described herein detail for illustrative purposes are subject to many variations in structure and design. It should be emphasized, however, that the present disclosure is not limited to a particular projectile launching apparatus, as shown and described. It is understood that various omissions and substitutions of equivalents are contemplated as circumstances may suggest or render expedient, but these are intended to cover the application or implementation without departing from the spirit or scope of the claims of the present disclosure.

[0041] The terms “first,” “second,” and the like, herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another, and the terms “a” and “an” herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.

[0042] The present disclosure provides a projectile launching apparatus for launching a projectile, such as a pellet, a BB bullet, an arrow, a dart and a paintball. The projectile launching apparatus may be an arrangement of a linear motion converter driven by a motor, a piston coupled to the linear motion converter and reciprocally movable within a cylinder, a gas spring and a breech assembly. The piston, which is capable of having reciprocal movement caused by the linear motion converter, compresses a gas within the cylinder, which compressed gas is communicated to a barrel of the breech assembly. The compressed gas expands in the barrel of the breech assembly for launching the projectile, which projectile is chambered in the barrel, with a high velocity (or an adjusted velocity as elsewhere described herein).

[0043] FIG. 1 is an isometric view of a projectile launching apparatus 1000, according to an exemplary embodiment of the present disclosure. The projectile launching apparatus 1000 includes a start switch, a power source, a motor 101, a control circuit, a gear reduction mechanism 102, a cylinder 105, a linear motion converter 110 (herein the linear motion converter 110 is a barrel cam, so hereinafter the ‘linear motion converter 110’ is interchangeably referred to as the ‘barrel cam 110’), a gas spring 100, a handle 103, and a breech assembly 128. The projectile launching apparatus 1000 is capable of launching a projectile from a barrel 104 of the breech assembly 128 with the help of a gas compressed within the cylinder 105 due to a reciprocal movement of a piston 109 that is coupled to the linear motion converter 110. FIG. 2 shows a cross-sectional view of an exemplary apparatus 1000.

[0044] The operation cycle of the projectile launching apparatus 1000 may start by pressing ON on the start switch of the apparatus. The power source is configured to supply power to the motor 101 through the control circuit. Specifically, the motor 101 is electrically connected to the power source through the control circuit. The control circuit may be any electronic-based apparatus that is capable of connecting power to the motor 101 for the purpose of initiating an operation cycle of the projectile launching apparatus 1000. The control circuit is further capable of disconnecting the power to the motor 101 after the operation cycle of the projectile launching device 1000 is completed. Herein, the operation cycle of the projectile launching apparatus 1000 denotes an operation involved in launching the projectile from the barrel 104 of the projectile launching apparatus 1000 upon once pressing the start switch ON. The motor 101 generates a rotational movement, when the motor 101 is powered ON and the rotational movement of the motor 101 is transferred to a movement of the linear motion converter 110 through the gear reduction mechanism 102.

[0045] In the exemplary embodiment of the present disclosure as shown in FIG. 1, the gear reduction mechanism 102 includes a plurality of gears, such as planet gears and ring gears. The gear reduction mechanism 102 is configured to transfer the rotational movement of the motor 101 into the movement of the linear motion converter 110. Herein, for the purpose of exemplary representation, the gears are represented as planetary gears in FIG. 1. However, it will be apparent to a person skilled in the art that the gears may include other type of gears, such as a helical gear, a bevel gear and a face gear. Further, the gear reduction mechanism 102 may include a plurality of such gears or a combination of such gears, which are capable of transferring the rotational movement of the motor 101 to the movement of the linear motion converter 110.

[0046] Although herein the linear motion converter 110 is represented as a barrel cam (and hereinafter referred to as “barrel cam 110”), it will be apparent to a person skilled in art that the linear motion converter 110 may be any suitable mechanism that converts the rotational movement of the motor 101 into a linear reciprocal movement of any element. For example, the linear motion converter may include other arrangements such as a rack and pinion arrangement, a lead screw arrangement and a crankshaft and connecting rod arrangement.

[0047] The barrel cam arrangement includes a barrel cam 110 (shown in FIG. 4 and FIG. 5, for example) and a fixed follower assembly 108 (shown in FIG. 3 and FIG. 5, for example). The follower assembly 108 includes a follower 130 (shown in FIG. 5, for example) and follower bearings 129 (shown in FIG. 9, for example). In an embodiment, the apparatus further comprises a stationary cam follower, which cam follower may contact the barrel cam to force linear movement as the barrel cam rotates, thereby energizing the gas spring.

[0048] The barrel cam 110 is further coupled to the piston 109 (shown in FIG. 5 and FIG. 9, for example), which is partially disposed within the cylinder 105. The rotation of the barrel cam 110 enables the barrel cam 110 and the piston 109 to move reciprocally within the cylinder 105 as the fixed follower assembly 108 rolls on the barrel cam 110.

[0049] The barrel cam 110 and the piston 109 are further coupled to the gas spring 100, as shown in FIG. 6, for example. The gas spring 100 is energized as the barrel cam 110 and the piston 109 move reciprocally within the cylinder 105. The gas spring 100 is comprised of a gas spring cylinder 117, a gas spring end cap and fill port 118, a gas spring seal 119 and a gas spring piston 120 (shown in FIG. 4, for example). The gas spring piston 120 is operably coupled to the piston 109. The gas spring cylinder 117 is capable of accommodating gas therein. The gas spring cylinder 117 is pressurized within a range of 100 and 5000 psi. In an embodiment, the gas spring further comprises a rod seal disposed upon the piston of the gas spring.

[0050] Referring now to FIGS. 3, 5, 6, 7 and 8, a breech assembly 128 is comprised of a breech 107 and a bolt 106. In order to allow a projectile to enter the breech assembly, the bolt 106 must move reciprocally within the breech 107. The reciprocal movement of the bolt 106 is accomplished by a bolt driving mechanism. In an embodiment, the mechanism comprises coupling the bolt 106 to a bolt rod 113. In an embodiment, the mechanism comprises further the bolt rod 113 being operably coupled to the bolt follower assembly 112. In an embodiment, the bolt follower assembly 112 may be biased forward by a bolt assembly spring 116 (also referred to herein as a bolt spring). The bolt 106, bolt rod 113 and bolt follower assembly 112 are all operably coupled and move together. In an embodiment, the bolt follower assembly 112 is in contact with a second linear motion convertor. In an exemplary embodiment the second linear motion convertor comprises a bolt barrel cam 111. The bolt barrel cam 111, the gas spring 100, the barrel cam 110 and the piston 109 are capable of all rotating together. As the bolt barrel cam rotates, it moves the bolt follower assembly 112, bolt rod 113 and bolt 106 reciprocally to allow a projectile to enter the breech 107 and then to seal the bolt in the breech before the gas spring 100 releases its stored energy to launch the projectile.

[0051] Referring to FIG. 4, an exemplary gas spring 100 is depicted. The gas spring piston 120 is coupled to the piston 109. FIG. 4 also depicts the coupling of the piston 109 to the barrel cam 110. The gas spring 100 may also incorporate drive rollers 121. The drive rollers 121 may engage with the barrel cam 110 to allow both rotation and linear reciprocation of the barrel cam 110. For example, the rollers 121 may transmit the torque of the motor to the barrel cam, thus allowing the barrel cam to rotate and to translate linearly to energize the gas spring. As the gas spring 100 rotates, the barrel cam 110 makes contact with the follower assembly 108 (shown in FIGS. 5, 6, 7 and 8, for example), forcing the barrel cam 110 to slide linearly in the cylinder 105. This motion energizes the gas spring 100 until the barrel cam 110 releases from the follower 130, thereby allowing the piston 109 and barrel cam 110 to move away from the gas spring 100 to compress air in front of the piston 109. This compressed air moves through the bolt 106 and the barrel 104 to launch the projectile.

[0052] In the preferred embodiment of the disclosure, an exemplary full cycle is depicted in FIGS. 5, 6, 7 and 8. FIG. 5 depicts the operational elements of the disclosure immediately after a projectile has been launched. The gas spring 100 is not energized and the bolt 106 is sealed in the barrel 104. As the gas spring 100 starts to rotate in FIG. 6 via the gear box 102 and the motor 101, the follower 130 rolls on the barrel cam 110 to start to energize the gas spring 100. The bolt barrel cam 111 also rotates and moves the bolt follower assembly 112 reciprocally. This energizes the bolt assembly spring 116 and moves the bolt 106 linearly to open the breech 107 and allow a projectile to enter. FIG. 7 continues the cycle as the elements rotate. In FIG. 7, the bolt is fully open and is maintained in the open position long enough for a projectile to enter the breech 107. In this embodiment, the bolt 106 is maintained in its fully open position for at least 45 degrees, and preferably up to 300 degrees of rotation. (This section of the cam that so maintains the bolt 106 is referred to herein as a dwell). In an embodiment, the preferred dwell is greater than 180 degrees. Each degree of rotation energizes the gas spring 100 more as the barrel cam 110 moves linearly. In FIG. 8, the dwell of the bolt barrel cam 111 is completed as the bolt follower assembly disengages from the bolt barrel cam 111, allowing the bolt assembly spring 116 to move the bolt 106 forward sealing the projectile into the barrel 104 where it is ready for launch. FIG. 8 depicts the maximum energized state of the gas spring 100, where the follower 130 is about to disengage the barrel cam 110. This energized state is also shown in FIG. 9. The next few degrees of rotation may release the barrel cam 110, allowing it to move reciprocally towards the breech 107, thereby compressing the air in front of the piston 109 to launch a projectile.

[0053] The operational cycle can be stopped at any point during the sequence described above. However, the preferred stopping and starting point of the cycle is depicted in FIG. 7. It is preferred because the bolt 106 is in the open position between cycles. It is additionally preferred because when the cycle is resumed a projectile can be launched with only a few degrees of rotation after starting the cycle. This creates an elapsed time that is imperceptible to the user. That is, the user interprets the firing of the projectile as immediate. The time to launch the projectile from cycle start is preferably less than 120 msec. and more preferably less than 50 msec. Stopping of the cycle may be accomplished by using a sensor 22 as shown in FIG. 10. In an embodiment, the sensor determines a pre-determined position in the cycle and communicates to the control circuit to remove power from the motor, stopping the cycle. When the cycle stops (as seen in FIG. 7), the barrel cam 111 stops while in a position where it is engaged with the follower 130. This engagement creates a rotational force on the barrel cam 111 that wants to “back drive” the rotation of the cam. To prevent this, a one-way clutch 115, or a flat on the barrel cam 111 are used to retain its position. The one-way clutch 115 can be positioned anywhere in the rotational system including at the motor, at the gear box or the gas spring 100. In the preferred embodiment it is positioned on the gas spring 100 as depicted in FIG. 3. The one-way clutch 115 may be one of a roller clutch, a Sprague clutch, a ratchet and pawl or a detent or the like.

[0054] In another embodiment of the present disclosure, and as shown in FIGS. 11 and 12, the projectile launching apparatus 1000 comprises a spring assembly 140 instead of a gas spring. The spring assembly 140 consists of a mechanical spring 141, a drive shaft 142, and the drive rollers 121. In this embodiment, a first end of the drive shaft 142 is coupled to the gear reduction mechanism 102 (such as the gear reduction mechanism as shown in FIG. 3) and runs through the open center of the mechanical spring 141 that is formed by the coil configuration of the spring. At the second end of the drive shaft 142, the drive rollers 121 are coupled thereto and are allowed to rotate in the same manner as the gas spring embodiment discussed above. The mechanical spring 141 rotates along with the drive shaft 142 and is supported by the drive shaft 142 on the drive shaft end that is coupled to the gear reduction mechanism 102. An end of the mechanical spring 141 is disposed against the barrel cam 110. In this embodiment, the bolt barrel cam 111 is preferably connected to the barrel cam 110. In such a preferred embodiment, the bolt barrel cam 111 moves with the barrel cam 110 as it rotates and translates. As the barrel cam 110 is rotated by the drive rollers 121 by the drive shaft 142, the barrel cam 110 engages the follower 130 (and follower assembly 108, as also shown in FIG. 5, for example) and starts moving linearly, energizing the mechanical spring 141 until the barrel cam releases from the follower 130, thereby allowing the piston 109 and barrel cam 110 to move to compress air in front of the piston 109. This compressed air moves through the bolt 106 and the barrel 104 (as shown in an exemplary embodiment in FIG. 5) to launch the projectile. In an embodiment, spring 141 is comprised of at least one of steel, titanium, rubber and urethane.

[0055] In another embodiment of the present disclosure, and as shown in FIG. 13 and FIG. 14, the apparatus comprises a plurality of cam followers 130 that are capable of engaging a plurality of barrel cams 110 or a barrel cam with multiple tracks. The plurality of cam followers 130 engage the plurality of barrel cams and/or the multiple tracks of a barrel cam. In an embodiment, a plurality of cam followers comprises at least two or more followers 130 that are disposed inline along the longitudinal axis of the cam. In such an embodiment, the followers 130 can engage multiple cam tracks. This is advantageous because multiple followers can reduce the load that is applied to the barrel cam 110, thereby allowing the barrel cam 110 to be constructed of plastic or other lightweight material to reduce the moving mass of the barrel cam. For the launcher to operate effectively and optimally, the mass of the barrel cam 110 and the piston 109 must be as low as possible to achieve the desired high velocity needed to compress the air in front of the piston 109. Using plastic as the material for the cam 110 and piston achieves this goal. However, plastic has a low allowable contact stress therefore the force applied by the follower must be sufficiently below the yield of the material. Therefore, multiple followers are advantageous for higher energy projectile launching apparatuses.

[0056] The foregoing descriptions of specific embodiments of the present disclosure have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the disclosure to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the disclosure and its practical application, and to thereby enable others skilled in the art to best utilize the disclosure and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omissions and substitutions of equivalents are contemplated as circumstances may suggest or render expedient, but such are intended to cover the application or implementation without departing from the spirit or scope of the claims of the present disclosure.