The invention relates to the field of noise generation devices. In particular the invention relates to a device that is operable to simulate the sound of a gun.
In a variety of situations it is desirable to generate a noise, and in particular a loud noise.
For example, the simulation of the noise of a gun may be desirable where guns are used that do not fire ammunition or live rounds and therefore do not generate the type of sounds that are commonly associated with ‘real’ guns, e.g. firearms. Recreational combat sports such as airsoft, paintball and laser tag all involve the use of guns. However the guns do not generate noises that are similar to those generated with live round weapons. Participants in such sports are often seeking a safe experience that simulates real warfare as far as possible, including the noise made by the weapons used.
Armed forces often train using simulation weapons or with real weapons but using blank ammunition. Training aims to replicate real warfare as closely as possible to ensure soldiers are prepared should a genuine conflict arise. It is therefore desirable for soldiers to be able to train using weapons that simulate real gun noises while enabling the use of simulation weapons or blank ammunition.
There may also be circumstances in which the simulation of a gun noise is desirable when using other types of weapons such as air rifles.
In the above examples it is generally desirable for the device that generates a simulated gun noise to form part of the recreation/simulation weapon (e.g. an airsoft gun), or to be easily connectable to it and be portable along with the weapon. This ensures the noise generated by the device emanates from as close to the weapon as possible, thus creating heightened realism.
Drama productions often need to simulate gun noises, for example on a movie set, TV production or theatre production. In the case of movies or TV such noises can be added to a soundtrack in post-production but in some cases the realism of an authentic sounding noise generated at the right moment in the action may be desirable. In some cases it may be acceptable for a gun noise to be generated by a device not visible to the audience (i.e. off-camera or off-stage) but in other cases the realism of a gun that generates the noise itself may be required.
There is therefore a need for a device that can simulate a gun noise, whether as a standalone device or a device that can be mounted on a real or simulation gun or other weapon.
Aside from the generation of a noise for the purposes of simulating a gun, there are many other circumstances in which a loud noise may be required. For example, in simulated warfare, there may be many other sources of loud noises which are desirable to replicate, namely explosions caused by grenades, bombs, claymores, mines, improvised explosive devices (IEDs) and the like. In non-warfare related circumstances, it may be desirable to generate loud noises as part of a show, for example to replicate or supplement pyrotechnics. Additionally, bird scarers are devices that generate loud noises to scare birds (or other wildlife). For such circumstances a portable device able to generate loud noises safely would be desirable.
Prior art noise generation devices suffer from a number of drawbacks that mean they are not able to meet at least some of the needs identified above. Some noise generating devices exist that create noise by igniting a combustible material such as acetylene in a mixture with oxygen. An example is described in US patent publication no. 2009/0241794. This and other kinds of device operating on a similar principle require the use of large hoses to supply the combustible material from a gas tank external to the device to the combustion chamber. They also tend to be reasonably large. As a result, their portability is limited. Furthermore, the noise created is not akin to a gunshot.
Some prior art bird scarers use LPG as a combustible material to create a loud noise. Again, such devices are large and cumbersome, require the supply of the LPG through a hose from an external tank and are not capable of creating loud noises in rapid succession.
Conventional noise generation devices are not configured for fixing to a gun, nor for generating a realistic gun fire noise at a time that can be synchronised with the firing of the gun, nor generating gun fire noises at a high rate, for example the rate that would be expected from the firing of a gun.
It is therefore an object of the invention to provide an improved noise generation device, particularly a noise generation device that addresses at least some of the needs identified above. Alternatively, it is an object of the invention to at least provide the public with a useful choice.
Preferred aspects of the invention are set forth in the appended claims. Particular embodiments are described below in non-limiting terms.
According to a first embodiment of the invention, there is provided a noise generation device comprising:
Preferably, the combustion of the material causes the moveable wall member to move from the sealed position to the open position. More preferably, combusting material pushes the moveable wall member to move from the sealed position to the open position. In some embodiments, the moveable wall member may comprise an internal surface against which combusting material is able to apply pressure to move the moveable wall member from the sealed to open position.
Preferably, the noise generation device comprises means for moving the moveable wall member back to the sealed position from the open position. In some embodiments, the noise generation device comprises a return mechanism to move the moveable wall member back to the sealed position from the open position.
The means for moving the moveable wall member back to the sealed position from the open position may comprise a spring configured to compress when the moveable wall member is in the open position and to expand to push the moveable wall member into the sealed position.
In some embodiments, the means for moving the moveable wall member back to the sealed position from the open position may further comprise at least two magnetic members capable of magnetic attachment to attract the moveable wall member into the sealed position. The magnetic members may be operable to hold the moveable wall member in the sealed position.
It will be understood that the term “magnetic” where used in this specification refers to either exhibiting the properties of a magnet or being capable of being attracted to a magnet. That is, the term encompasses both magnetised materials (including permanent and temporary magnets) that produce a magnetic field and materials that are attracted to such magnetised materials, typically ferromagnetic or ferrimagnetic materials such as iron and steel. It will further be understood that for two magnetic members to be capable of magnetic attachment, one or both of the magnetic members needs to be magnetised.
In a preferred embodiment of the invention, the moveable wall member comprises a sleeve member adapted to slide longitudinally along a sleeve guide between the sealed and open positions.
Preferably, the noise generation device comprises a body portion spaced apart from the sleeve guide and attached thereto by one or more spacer elements, the sleeve abutting against the body portion and spanning the space between the body portion and sleeve guide when in the sealed position such that the chamber is defined at least by the sleeve guide, sleeve and body portion. More preferably, the sleeve is slideable along the sleeve guide between the sealed position, in which the sleeve abuts against the body portion to close the chamber, and the open position, in which the sleeve is spaced from the body portion to open the chamber.
Preferably, the noise generation device comprises a body seal member attached to, or mounted on, the body portion, and configured to seal with the sleeve when the sleeve is in the sealed position.
Preferably, the body seal member comprises a flange configured to be energised and seal against the inside of the sleeve as a result of an increase in pressure inside the chamber.
Preferably, the noise generation device comprises a sleeve seal member attached to, or mounted in, the sleeve, and configured to seal with the sleeve guide when the sleeve is in the sealed position, and between the open position and the sealed position.
Preferably, the sleeve seal member is configured to expand and contract while maintaining a seal. More preferably, the sleeve seal member comprises an annular member having a slit therethrough. Preferably the slit is oriented at an angle with respect to the edge of the annular member. Preferably the angle is 30 degrees.
In some embodiments, the annular member comprises a channel around the outside thereof, and the sleeve seal member comprises an O-ring positioned within the channel and configured to urge the slit of the annular member closed.
Preferably, the sleeve guide comprises a tapered outer surface configured to reduce the friction between the sleeve guide and the sleeve as the sleeve moves towards the open position.
Preferably, the sleeve guide comprises a first cylindrical portion around which the sleeve seal forms a seal in the sealed position, a second cylindrical portion over which the sleeve seal is able to slide when the sleeve seal is near the open position, and a tapered portion between the first cylindrical portion and the second cylindrical portion.
Preferably, the sleeve guide comprises a stopping flange for limiting movement of the sleeve away from the body portion. More preferably, the sleeve guide comprises an end cap, secured to the sleeve guide, providing the stopping flange to the sleeve guide.
Preferably, the spring is mounted on the sleeve guide between the stopping flange and the sleeve.
In some embodiments, one or more of the spacer elements which attach the sleeve guide to the body comprises a hollow cable pillar through which one or more cables and/or conduits are able to pass across the chamber.
In some embodiments, the noise generation device comprises a detector configured to detect that the sleeve is not in the sealed position. Preferably, the detector is located within the sleeve guide, and configured to detect when the sleeve is adjacent or proximate the detector. Preferably, the detector is positioned behind a hole in the sleeve guide, and is configured to detect that the sleeve is over the hole. For example, the detector may comprise an infrared sensor for detecting the presence of the sleeve over the hole.
In some embodiments, the sleeve comprises a first magnetic member and the sleeve guide comprises a second magnetic member, the first and second magnetic members positioned to bias the sleeve to the sealed position through a mutually attractive magnetic force.
In one embodiment, the first and second magnetic members comprise a magnet and steel ring, the steel ring located on or as part of the sleeve, the magnet located within the sleeve guide configured to attract the steel ring, and thereby the sleeve, to the sealed position.
In some embodiments, the sleeve comprises an inner surface with a contour configured to cause the sleeve to move along the sleeve guide away from the body portion when material combusts in the chamber. For example, the inner surface of the sleeve may comprise a shoulder facing the body portion of the noise generation device.
Preferably, the means for injecting combustible material into the chamber comprises:
In a preferred embodiment of the invention, the valve is a solenoid valve.
Preferably, the noise generation device comprises a reservoir of combustible material. The combustible material may be in the form of a combustible gas, for example propane or butane.
In preferred embodiments, the noise generation device comprises a regulator for regulating the flow of gas injected into the chamber.
Preferably, the means for triggering combustion comprises means for generating a spark inside the chamber. More preferably, the means for generating a spark inside the chamber comprises spark probes extending into the chamber substantially in front of the valve.
The noise generation device may comprise means for sensing the temperature inside the chamber and means for disabling operation of the noise generation device if the chamber temperature exceeds a predetermined temperature limit. For example, the means for sensing the temperature may comprise a thermistor.
In some embodiments, the noise generation device comprises a pump operable to remove gas from the chamber. In some embodiments, the noise generation device is configured to operate the pump in the event of a failed attempt at ignition. In some embodiments, the pump applies a vacuum to draw gas out of the chamber. In other embodiments, the pump generates a flow of fresh air to displace gas from the chamber.
Preferably, the noise generation device comprises a controller. The controller may be adapted to control operation of the noise generation device. For example, the controller may be operable to control the means for injecting combustible material into the chamber and the means for triggering combustion of the combustible material.
In some embodiments of the invention, the controller is operable to trigger operation of the noise generation device in response to a received signal. The noise generation device may comprise a receiver to receive the signal, triggering the noise generating device to operate. More preferably, the noise generation device comprises means for detecting a voltage drop in a power supply and is operable to trigger operation of the device as a result of a voltage drop detection.
In some embodiments, the noise generation device comprises means for detecting a current, and is operable to trigger operation of the device as a result of detecting the current.
In some embodiments, the noise generation device comprises means for detecting an acceleration, and is operable to trigger operation of the device as a result of detecting the acceleration. Preferably, the means for detecting an acceleration of the device is an accelerometer configured to detect acceleration of a device to which the noise generation device is attached.
In some embodiments, the noise generation device comprises means for detecting a sound, and is operable to trigger operation of the device as a result of detecting the sound.
In some embodiments, the noise generation device is operable to trigger operation of the device as a result of detecting any one or more of a voltage drop, current, acceleration, and sound.
Preferably, the controller is operable to trigger combustion of the combustible material a predetermined period of time after combustible material has been injected into the chamber.
According to a second embodiment of the invention there is provided a gun attachment operable to simulate the noise of a gun, the gun attachment comprising:
It will be understood that the gun attachment may be configured to connect to any type of gun, including guns intended for use in warfare, hunting or recreational combat sports such as paintball, airsoft and laser tag. The invention is not limited by the type of gun with which the gun attachment may be used and suitable mechanisms for attaching a gun attachment to an individual type or model of gun will be apparent to the skilled addressee.
Preferably, the means for triggering combustion comprises means for triggering operation of the gun attachment in response to a received signal. More preferably, the gun attachment comprises means for detecting a voltage drop in a power supply and is operable to trigger operation of the device as a result of a voltage drop detection.
In another embodiment of the invention, the gun attachment comprises means for detecting a current, and is operable to trigger operation of the gun attachment as a result of detecting the current.
In some embodiments, the gun attachment comprises means for detecting an acceleration, and is operable to trigger operation of the gun attachment as a result of detecting the acceleration. Preferably, the means for detecting an acceleration of the device is an accelerometer, and the detected acceleration that triggers operation of the gun attachment is of a nature expected of recoil caused by firing of the gun.
In some embodiments, the gun attachment comprises means for detecting a sound, and is operable to trigger operation of the gun attachment as a result of detecting the sound.
In some embodiments, the gun attachment is operable to trigger operation of the gun attachment as a result of detecting any one or more of a voltage drop, current, acceleration, and sound. In some embodiments the gun attachment comprises a receiver for receiving a signal corresponding to the voltage drop, current, acceleration, or sound, as the case may be.
Preferably, the gun attachment is configured to simulate the appearance of a gun part or accessory.
Preferably, the means for allowing exhaust material to exit the chamber after combustion comprises a moveable wall member of the housing, and means for causing the moveable wall member to move from a sealed position, in which the chamber is fluidly sealed, to an open position, in which the chamber is open, on combustion of the material inside the chamber to allow material to exit the chamber.
Preferably, the combustion of the material causes the moveable wall member to move from the sealed position to the open position. More preferably, combusting material pushes the moveable wall member to move from the sealed position to the open position. In some embodiments, the moveable wall member may comprise an internal surface against which combusting material is able to apply pressure to move the moveable wall member from the sealed to open position.
Preferably, the gun attachment comprises means for moving the moveable wall member back to the sealed position from the open position.
The means for moving the moveable wall member back to the sealed position from the open position may comprise a spring configured to compress when the moveable wall member is in the open position and to expand to push the moveable wall member into the sealed position.
According to a third embodiment of the invention, there is provided a simulation weapon, comprising:
In some embodiments the simulation weapon is in the shape of a gun and comprises a barrel portion, the chamber being located within the barrel portion of the simulation weapon.
In some embodiments the simulation weapon comprises a laser device configured for use in a laser training system, and the triggering assembly triggers the combustible material to combust when the laser device is operated, to produce a noise.
Preferably, the barrel portion defines a longitudinal axis of the simulation weapon and any one or more of: the spark module; the chamber; the valve; the regulator; the reservoir and the laser emitter are aligned along the longitudinal axis.
Further aspects of the invention, which should be considered in all its novel aspects, will become apparent to those skilled in the art upon reading of the following description which provides at least one example of a practical application of the invention.
One or more embodiments of the invention will be described below by way of example only, and without intending to be limiting, with reference to the following drawings, in which:
The invention generally relates to a device for generating noise, and in particular a device for simulating the noise of a gun, firearm or the like. The device may be used in isolation, it may be configured as an attachment to a gun, for example a paintball gun, airsoft gun or laser gun, or it may be integral to the gun.
A noise generation device according to one embodiment of the invention comprises a housing defining a chamber in which one or more of the chamber walls are moveable between one position in which the chamber is fluidly sealed and another position in which the chamber is open to the external atmosphere. Combustible material is injected into the sealed chamber and combustion of the combustible material is triggered. This generates an explosion which generates a gun-like noise. At the same time, the moveable wall of the chamber is opened to allow exhaust material to exit the chamber.
Following the combustion of material, fresh air flows into the open chamber. The moveable wall then moves back into place to re-seal the chamber ready for more combustible material to be injected for the next ‘firing’ of the device (i.e. noise generating process).
Exemplary Noise Generation Device
Combustible material is stored in reservoir 101. Any form of combustible material may be used, including combustible gases such as propane and butane or a mixture of such gases. The combustible gas may be stored under pressure in reservoir 101. In some embodiments of the invention, the gas is stored in the reservoir 101 at a pressure of 150-200 psi.
An outlet conduit of the reservoir 101 is connected to a valve 102, which is operable to inject the gas into a chamber 103. In the embodiment shown in
In the embodiment shown in
In one embodiment, the noise generation device comprises a solenoid valve with a 0.3 mm orifice that is open for a period such as 12-20 ms. The duration that the solenoid valve is open needed to inject the amount of gas into the chamber to result in a desired explosion will vary depending on the size of the orifice, size of the chamber, the type of gas used and the temperature, as well as other conditions. For example, in another embodiment the solenoid valve used has a 0.6 mm orifice, which reduces the required duration that the valve is open, reducing the cycle time and allowing for an increased firing rate. The noise generation device may comprise a means for controlling the valve open duration so that a user can adjust the duration at any time. For example, a dial or other control interface may be provided.
Noise generation device 100 comprises means for triggering combustion of the combustible material in chamber 103. In the embodiment of
The above described components are housed in a body portion 109 of noise generation device 100.
One preferred embodiment of the invention includes the body portion 109 and the components housed within, as shown in
With reference to
Extending longitudinally from the body portion 109 is a sleeve guide 210 mounted to the gas head 201.
Sleeve guide 210 may take the form of a cylindrically shaped member. Mounted on the sleeve guide is a sleeve 211. The sleeve 211 is configured to slide longitudinally along the sleeve guide 210. In the preferred embodiment illustrated in
In this embodiment, an end portion 213 of the sleeve guide 210 is connected to the gas head 201 with spacer rods 202. There are two spacer rods 202 with threaded ends that pass through holes in the gas head 201 to be received securely within the body 109 of the noise generation device. The holes in the gas head 201 through which the threaded ends of spacer rods 202 pass are countersunk to receive correspondingly sized sealing stops formed integrally as part of the spacer rods 202. The distal ends of the spacer rods 202 have holes tapped to receive screws, so that the end portion 213 of the sleeve guide 210 can be secured onto the forward ends of the spacer rods 202.
An electrode 208 is shown in
In
It is helpful for allowing the unit to fire if a seal about chamber 203 is created when the sleeve is in the sealed position (shown in
The gap between sleeve 211 and sleeve guide 210 in this embodiment is sealed by a sleeve seal 230, 231.
In this embodiment the ring 230 is formed from Teflon, although in other embodiments it could be formed from any PTFE or any other suitable material.
The noise generation device of the embodiment described with reference to
The seal 240 includes an integrally formed annular flange 241 extending away from the body 109 towards the sleeve 211 from an outer edge of the body of seal 240.
When the noise generation device is fired, the body seal 240 becomes energised by the increased pressure in chamber 203 and the flange 241 is forced against the sleeve 211, improving the seal as the pressure inside the chamber 203 increases, until the pressure becomes too high and the sleeve 211 is forced away from the gas head 201 to allow the exploded gas to escape chamber 203, producing the firing noise. When the sleeve 211 is forced off the seal 240 during firing, the characteristics of seal 240 can affect the noise produced by the noise generating device. In particular, a more flexible flange 241 can produce a sound having a higher pitch. For example, the thicker the flange, the lower the pitch. Furthermore, a longer flange 241 (i.e. extending further away from the body of seal 240) can produce a louder sound. However, if the flange 241 is too rigid, the device may fire less reliably.
Also labelled in
The seal 240 is formed from polyurethane, however in alternative embodiments, any suitable rubber or other material suitable for providing the advantages described herein may be used.
In some alternative embodiments, the annular flange of the body seal may be split into two or more “tongue” like flanges, so that the flanges do not cover the complete circumference of the seal. The number of flanges and the proportion of the circumference of the flange they occupy can also alter the characteristic of the sound produced by the noise generation device, in a manner that can be readily determined by experiment.
In
Mounted to the forward end of the sleeve guide 210 is an end cap 214. The end cap 214 has a central boss that is received inside the sleeve guide 210, which is hollow at the forward end to receive the end cap. A threaded rod connects the rear end of the sleeve guide 210 and the end cap 214. The forward end of the end cap 214 is radially larger than the rear end with the boss, providing a surface towards which the sleeve 211 moves.
The noise generation device comprises a means to move the sleeve 211 back to the closed, sealed position (shown in
The noise generation device may comprise means for reducing the friction between the sleeve 211 and the sleeve guide 210 so that the sleeve can slide easily between the open and sealed positions. Any way of reducing friction while maintaining the sealed contact between the sleeve 211 and the sleeve guide 210 may be used. For example, the external surface of the sleeve guide 210 may be chrome-plated. A lubricant may also be used.
Further Exemplary Embodiment of a Noise Generation Device
As described above, one embodiment of the invention includes:
An alternative embodiment of the invention includes:
With reference to
In this embodiment, the sleeve guide 310 is supported by way of support pillars 302 (only one of which is shown), and a cable pillar 307. The cable pillar 307 is hollow, and open at the ends, to enable cables to pass through its centre. The cable pillar 307 enables cables to pass from one side of the chamber 303 to the other without being exposed to combustion of gas.
In this embodiment, cables 308 are connected to electronic components in the body 109, and pass through the cable pillar 307 to provide power to PCB 320 within the sleeve guide 310 and mounted to an end portion 313 of the sleeve guide 310. Electrically connected to the PCB 320 is an infrared (IR) diode 321. Diode 321 is positioned behind an aperture 322 in the firing sleeve. The diode 321 is configured to emit and detect IR signals, and configured to detect whether the sleeve 311 is covering the aperture 322 by reflecting signals off the sleeve 311. If the diode 321 detects that the sleeve 311 is over the aperture, and therefore not in the sealed position, then a controller 118 in the body 109 may control operation of the device accordingly, for example by preventing a further ignition or supply of gas until the diode 321 detects that the sleeve 311 is no longer covering the aperture, and has therefore returned to the sealed position.
One useful feature of the embodiment shown in
Standalone Noise Generation Device
The noise generation device 400 operates similarly to the noise generation devices 200 and 300 described above. A combustion chamber 403 is defined by a gas head 401, a sleeve 411 and an end portion of a sleeve guide 410. Gas is injected into the chamber 403 via a valve 407 and ignited with electrodes 408a and 408b. The sleeve 411 slides from a sealed position (shown in
Whereas in the previously described embodiments the noise generation device comprises a reservoir which is filled with gas, the noise generation device 400 comprises a gas adapter 461 configured to receive a gas bottle 460. It will be understood that the gas adapter can be manufactured or chosen to match the desired type of gas bottle. A base plate 462 can be removed to access and change the gas bottle 460. Providing a gas bottle within the device eliminates the need to fill a reservoir with gas, and may simplify the design of the device 400, given the gas bottle 460 provides a structure for retaining the pressurised gas which would otherwise need to be designed into the device 400.
The sleeve 411 comprises a step 412 which reduces weight by reducing the thickness of the sleeve 412. Additionally, the step 412 enables the device 400 to be cocked manually if necessary, for example to clear the chamber 403 or to inspect the inside of the chamber. The sleeve seal 430 is not provided with an O-ring like the embodiments of
The noise generation device 400 also comprises a pump 450 fluidly connected to the chamber 403 and configured to pump exhaust gas out of the chamber 403. In this embodiment, the noise generation device 400 comprises a detector that determines whether or not combustion has occurred. In some cases, such as if moisture has accumulated in the chamber 403, or if the fuel-air mixture is not permitting for combustion. If this occurs and is detected by the device, then the pump 450 can be operated to pump out the contents of the chamber 403, allowing the chamber to be re-filled. The noise generation device 400 also comprises a battery 451 and PCBs 452 within the sleeve guide 410 to power and control the pump and the noise generation device. In alternative embodiments the pump and/or electronics and battery may be provided in a separate unit electrically connected to the noise generation device.
Simulation Weapon
The barrel portion 500 comprises a noise generation device which operates in a similar manner to the noise generation devices 200 and 300, although the components are sized and arranged so that they fit within the forward portion (which may be known as a forend) of a simulation weapon. This reduces the size of the simulation weapon and may increase realism. In this embodiment the simulation weapon 500 is configured for use in a laser training system.
With reference to
The way in which the barrel portion 500 of the simulation weapon 560 generates a noise is similar to the way in which the noise generating devices 200, 300 and 400 generate a noise, however there are differences in the arrangement of the components in the barrel portion 500. Firstly, a chamber 503 is located forward of the sleeve guide 510, and a reservoir 501 and valve 502 are located forward of the chamber. Gas flows forward from the reservoir 501 through a regulator 505, then back towards the valve 502, after which it is injected into the chamber 503. A sleeve 511 slides rearwards after ignition to vent the exhaust gas. A spark module 509 is located within the sleeve guide 510, and cables pass across the chamber from the spark module 509 through a cable pillar 507, to connect to electrodes 508 (only one of which is shown). It is advantageous in this embodiment to position the chamber 503 towards the rear of the barrel portion 500, so that a user can grip the barrel portion 500 towards the forward end of the barrel portion 500.
An electrical connector 565a provides power and control signals to the noise generating components within the barrel portion 500. A conduit is provided along the top of the barrel portion 500, through which cables (not shown) pass through to the laser device 566 at the barrel end 564, connecting via an electrical connector 565b. The noise generating components are preferably linked to the laser device, such that operation of the laser triggers operation of the noise generating components, to produce a noise, preferably sounding like a gunshot, simultaneously with the operation of the laser device. For example, operation of the laser device may cause the spark module 509 to trigger combustion of the gas within the chamber.
As has already been discussed, the preferred embodiment includes:
However, the embodiment shown in
In the alternative embodiment, connected to the front of body 109, and extending longitudinally from the body, is a sleeve guide 110. Sleeve guide 110 may take the form of a longitudinal member of constant cross-section, for example a cylindrically shaped member. Mounted on the sleeve guide is a sleeve 111. The sleeve 111 is configured to slide longitudinally along sleeve guide 110. In the alternative embodiment of
Sleeve guide 110 has a end wall portion 113 facing towards body 109 and is connected to the front of body 109 by one or more spacer elements 112. In the alternative embodiment of
In
The inside surface of sleeve 111 is shaped or contoured such that, when an explosion occurs inside chamber 103 and combusted material is expelled outward against the internal surface of the sleeve, the sleeve 111 is forced to move away from the body portion. Any suitable shaping of the inside surface of sleeve 111 may be used, and in the embodiment of
At one end of the sleeve guide 110 is a stopping flange 114 that limits the extent of movement of the sleeve 111 along the sleeve guide 110 away from the body 109.
The noise generation device comprises means to move the sleeve 111 back to the sealed position (of
The noise generation device may comprise means for reducing the friction between the sleeve 111 and the sleeve guide 110 so that the sleeve can slide easily between the open and sealed positions. Any way of reducing friction while maintaining the sealed contact between the sleeve 111 and the sleeve guide 110 may be used. For example, the external surface of the sleeve guide 110 may be chrome-plated.
The noise generation device may comprise a return mechanism in form of one or more magnets to bias the sleeve 111 into the sealed position. The use of magnets in this way helps to maintain the sleeve 111 in the sealed position before the device is ‘fired’, for example if the device is pointed with the sleeve guide 110 downwards, gravity would tend to cause sleeve 111 to move into the open position and this may not be desired. If sleeve 111 is held in place by one or more magnets) whose force of attraction is sufficiently strong to counteract the force of gravity, the sleeve 111 will stay in place despite the orientation of the device. Secondly, the attractive force of the magnets may help to pull the sleeve 111 back into the sealed position having opened, as will be described in more detail below.
In the alternative embodiment of
It will be appreciated that other embodiments of the invention may magnetically bias a moveable wall of the chamber into a sealed position in a different way. For example, magnets may be positioned in a different location. In one embodiment, for example, one of the magnets may be mounted on the body portion of the noise generation device. Alternatively, other sets of magnetic members may be used—for example a pairing of a magnet and a magnetic material that is not in itself magnetised but is attracted to a magnet.
Other Features
With reference to
The controller 118 triggers operation of the noise generation device 100 in response to a received signal. The received signal may be generated externally to the noise generation device, or by the device itself.
In one embodiment, the noise generation device comprises means for receiving an input signal from an external source. The signal may be received by a wired connection, for example by connection of an electrical connection to an input port on the noise generation device, or by a wireless connection, for example by means of a RF, Bluetooth or Infrared signal.
Operation of the noise generation device may occur in response to the detection of a voltage drop in a power supply to the device from an external power source, and the noise generation device controller 118 may comprise means to detect such a voltage drop. In the case of a noise generation device that is configured to operate with a recreational combat sports gun such as an airsoft or paintball gun, the device may comprise a power input port to connect to the power supply of the gun and means to detect a voltage drop in that power supply, which may, in the case of a typical recreational sports gun, result from firing of the gun.
In some embodiments the noise generation device may be triggered in response to the detection of current flow from a power supply, rather than detection of a voltage drop.
In some embodiments, the noise generation device may comprises means for detecting any one or more of a voltage drop, current, acceleration, sound or other events, and is operable to trigger operation of the device as a result of detecting those events. For example, the noise generation device may comprise an accelerometer, and trigger the device upon receiving a signal from accelerometer typical of the recoil expected from the particular type of gun (e.g. typical magnitude, duration, direction etc.) to which the noise generation device is attached.
In another embodiment, for example where the noise generation device is a stand-alone device, the signal to trigger operation of the device is generated by the device itself. The device may comprise a trigger, button or other activation mechanism to activate the device. A trigger 119 is illustrated in
Noise generation device 100 may comprise an attachment mechanism for connecting the device to another device. For example, the device 100 may be configured to be connected to a paintball gun, airsoft gun, laser tag gun or a ‘real’ gun. Any suitable mechanism for attachment of the noise generation device to another device may be provided but in the embodiment of
The noise generation device may be designed to visually simulate the appearance of part of a gun or a gun accessory. In the case of the embodiment of
Also illustrated in
The noise generation device may comprise means for disabling operation of the device if the temperature inside the combustion chamber, i.e. chamber 103 or 203, exceeds a predetermined temperature limit. In some embodiments, a temperature sensor is positioned inside chamber 203 and is operably connected to controller 118 such that the controller compares the detected temperature with a predetermined limit and does not allow the device to fire if the limit is exceeded. In one embodiment the temperature sensor is a thermistor. The temperature limit may be approximately 50° C. If the temperature in chamber 203 exceeds this temperature, the solenoid valve and electronic cabling may not operate correctly, and the gas may expand to such an extent that the spark cannot generate the desired explosion. If the temperature is too high, parts of the device may also be too hot to touch.
Operation of the Noise Generation Device
An exemplary operation of the noise generation device of the preferred embodiment will now be described with reference to the Figures.
A supply of combustible material, such as propane gas is injected into reservoir 101 through port 122. The device is then ready for ‘firing’. The term ‘firing’ will be used in this specification when referring to a noise generation device according to the invention for the action of generating a noise through operation of the device.
The device may be fired in a number of ways. As discussed above, the controller 118 may receive a signal indicating that the device is to be fired from an external source (e.g. detecting the voltage drop in a power source of a gun attached to the noise generation device) or from an internal source (e.g. a user pushing a button on the noise generation device). In either case, the controller 118 causes gas to be injected into the sealed chamber 203, the sleeve 211 being in the sealed position abutting the side of body portion 109 to seal the chamber. The controller 118 opens solenoid valve 102 for sufficient time to inject the required amount of gas into the chamber 203, the gas being injected into the chamber at the pressure set by the gas regulator 105.
The noise generation device, simulation weapon, or gun attachment, as the case may be, may comprise a receiver for receiving a signal to cause a trigger assembly to trigger ignition of the combustible gas and operate the device. In embodiments in which the device is a gun attachment, the device may be operable to trigger combustion of the combustible gas in the chamber in response to a signal corresponding to firing of the gun.
A short time after gas has been injected into chamber 203, the controller 118 causes spark module 107 to generate a spark across the spark probes 208 inside chamber 203. The time delay between injection of gas and sparking is controlled by the controller 118 and may be approximately 10 ms. The spark that is generated causes the combustible material inside chamber 203 to combust, generating an explosion.
The explosion generates the noise that simulates a gun noise. The explosion also causes material to be pushed outwards inside chamber 203, causing combusted material to impact against the walls of the chamber. The seal 240 is energised and force is exerted on the sleeve 211, thus causing it to move away from the body portion 109.
The explosion in chamber 203 therefore causes sleeve 211 to move from the sealed position (as shown in
As the sleeve 211 moves into the open position shown in
In the alternative embodiment shown in
It will be understood that, for the noise generation device, according to the alternative embodiment of
Referring again to the preferred embodiment, following an explosion in chamber 203, sleeve 211 preferably moves sufficiently far away from body 109 that the chamber is opened wide so that the combusted/combusting material can exit the chamber and fresh air can enter the chamber. This ensures that, when the chamber is again sealed and is ready for next firing, further injection of combustible gas into the chamber by the valve will result in the desired amount of combustible gas is present for a successful firing. If not enough gas can exit the chamber following one firing then there may be too much gas in the chamber following the next injection for a subsequent successful firing. By operating in this way, the noise generation device is able to be repeatedly successfully fired, and in quick succession.
In one alternative embodiment of the invention, the spring is configured such that, it exerts a force on the sleeve towards the body position even when the sleeve is in the sealed position. In this embodiment, magnets are not used since the force of the spring holds the sleeve in place even when the device is pointed downwards or jolted. In this embodiment, a significant force of the explosion may be needed to open the sleeve widely enough for the air inside the chamber to refresh after firing.
In one alternative embodiment of the invention, the sleeve is caused to open at the same time as, or shortly after, a spark is generated in the chamber. That is, the device comprises a mechanism to open the sleeve and the sleeve is not opened (or is not solely opened) by the force of the explosion.
Embodiments of the invention may provide an easily portable noise generation device that creates a realistic sounding gun noise. The device contains its own fuel supply, which can last for sufficient number of fires to be useful in a battle simulation or recreational combat game. The mechanism of the device automatically primes itself ready for the next firing.
Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like, are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense, that is to say, in the sense of “including, but not limited to”.
The entire disclosures of all applications, patents and publications cited above and below, if any, are herein incorporated by reference.
Reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that that prior art forms part of the common general knowledge in the field of endeavour in any country in the world.
The invention may also be said broadly to consist in the parts, elements and features referred to or indicated in the specification of the application, individually or collectively, in any or all combinations of two or more of said parts, elements or features.
Where in the foregoing description reference has been made to integers or components having known equivalents thereof, those integers are herein incorporated as if individually set forth.
It should be noted that various changes and modifications to the presently preferred embodiments described herein will be apparent to those skilled in the art. Such changes and modifications may be made without departing from the spirit and scope of the invention and without diminishing its attendant advantages. It is therefore intended that such changes and modifications be included within the present invention.
Number | Date | Country | Kind |
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705968 | Mar 2015 | NZ | national |
Filing Document | Filing Date | Country | Kind |
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PCT/NZ2016/050042 | 3/18/2016 | WO | 00 |