KR100222188B1 - Improved pneumatic gun and projectiles therefor - Google Patents

Abstract

The compressed air gun 50 has ventilation paths 60 and 62 arranged to be coupled to the compressed air source, and the ventilation paths 60 and 62 connect with the air chamber 56 via the trigger valve assembly 64. do. The gun includes a detachable breach 96 that is supported in a sealed position relative to the air chamber 56 by a support ring 108 that is rotationally fixed to its body 54. If the breach 96 is not supported in the sealed position, the inner lock assembly 116 is arranged to be locked together with the trigger valve assembly 64 so that the trigger valve assembly (although the breach 96 is sealed against the air chamber 56). 64) is prohibited. The breach 96 is integrated with a nozzle 98 that is secured to the end of the hose or tube, and the polymer projectile is adapted to apply force by air applied through the hose or tube to clean or remove the interior of the hose. Located in In addition, various improved forms of projectiles are disclosed.

Description

[Name of invention]

Improved compressed air gun and its projectiles

[Field of Invention]

The present invention relates to a compressed air gun, and more particularly to a gun for use in cleaning the interior of a hose or tube with compressed air.

[Background of invention]

Maintaining internal cleanliness of hoses, tubes, and pipework is a permanent problem. Here, if hoses or tubes are used, for example in the food industry or in the medical environment, keeping the lines clean is acute. Similarly, internal contaminants in hydraulic or pneumatic lines can cause failures and consume significant time. There are many situations in other industries that employ hoses, tubes, conduits, and pipes that require internal cleaning or substantially save money by eliminating replacement costs.

The most effective means of cleaning hoses and tubes is to employ a compressive projectile, which has an outer diameter larger than the inner diameter of the hose or tube passing under pressure. The projectile is moved along a hose or tube to remove certain material from the inner wall. Some projectiles will pass repeatedly through the length of the hose or tube under pressure to ensure that all contaminants are removed. A common means for achieving this cleaning operation is to place the projectile in the compressed air gun and operate the valve to allow the compressed air to flow through the gun so as to be introduced through a nozzle connected to the end of the hose or tube. Compressed air is passed through a nozzle to clean the inside of the pipe and a projectile is applied along the tube.

The problem with such a device is a system that ensures satisfactory work by ensuring that the projectile does not stick to the hose or tube, which is most important with no air leakage between the gun and the tube. Because hoses and tubes vary in diameter and material, they require a compressed air gun that can be simply applied according to the type of hose product.

U.S. Patent No. 4,974,277 discloses a compressed air gun with a handle, which has an air passage connected to a source of compressed air, the air passage communicating with the air chamber via a trigger valve. The gun includes a detachable breach sealed and engaged against the air chamber by a support ring axially secured to the body. The breach integrated with a nozzle attached to one end of a portion of the hose or tube, and the polymer projectile is positioned in the breach so that it is applied by air pressure through the hose or tube to clean the interior of the hose or tube.

Although the compressed air gun with the handle described above is easily housed and functions can be applied very well, some problems arise during the use of the gun. The present invention has several improvements made to overcome the above problem for the needs of end users.

The invention also relates to various improved projectiles employed in compressed air guns.

[Summary of invention]

According to one aspect of the invention, a detachable breach is arranged to be connected to a compressed air source and is connected to an air chamber via a trigger valve means and a detachable breach adapted to be supported in a sealed position where the breach is sealed to the air chamber. And an internal locking assembly configured to prevent the operation of the trigger valve means allowing passage of compressed air in use if the breach is not sealed against the air chamber because the breach is not supported in the sealed position. Provided is a compressed air gun.

Here, the breach is coaxially supported by the support ring movably from the open position while being detachable in the closed position with respect to the air chamber, and the inner locking assembly is not fully returned to the closed position. It is preferred to be internally locked together with the trigger valve means.

And, it is useful that the releasable fastening member is arranged to engage the support ring in the closed position. The inner locking member is axially coupled member operatively coupled to the trigger valve means and adapted to rotate in accordance with the operation of the trigger valve means such that the operation of the trigger valve means if the support ring does not sufficiently return to the closed position in use. It is preferable that the pivotable member is connected to the releasable fastening member to prohibit.

According to another aspect of the present invention, there is provided a bullet-shaped compressed air gun projectile comprising a cylindrical upper portion formed of a plastic material and at least one abrasive material layer adhered to a transport upper portion to increase the cleaning property of the bullet body.

According to another aspect of the present invention, there is provided a projectile for a compressed air gun in the form of a bullet which consists of a cylindrical portion of a plastic material consisting of a plurality of layers, each layer being formed of a plastic material having a different density than the adjacent layer.

The layer preferably extends substantially perpendicular to the normal direction of projectile movement.

It is desirable for the layer to be thin in order to increase or decrease the density. Typically the layer formed of plastic material varies from 80 to 20 kg.

[Brief Description of Drawings]

1 is a side view of a prior art gun with a support ring in an unfastened position.

FIG. 2 is a cross sectional view of the gun shown in FIG. 1 with the breach / nozzle assembly attached. FIG.

3 is a perspective view of an embodiment of an improved compressed air gun with a support ring in a locked position.

4 is a side view of the gun shown in FIG.

5 is a rear view of the gun shown in FIG.

6 is a bottom view of the gun shown in FIG.

FIG. 7 is a partial cross-sectional view of the gun shown in FIGS. 3-6 with a breach / nozzle assembly attached. FIG.

8 (a) to 8 (c) are views for explaining three different breach / nozzles for the cross section gun.

9 shows another breach / nozzle that does not require an adapter ring.

10 (a) and 10 (b) show the adapter ring for breach / nozzle shown in FIG.

11 and 12 show two forms of an improved projectile having one or more abrasive layers.

13 shows another form of the improved projectile.

Detailed description of the invention

1 and 2 show a compressed air gun 10 according to the prior art disclosed in US Pat. No. 4,974,277, wherein the handle portion 12 clamped to the main body portion 13 by a set screw 9. The handle 11 which comprises () is provided. The main body portion 13 has a circular cross section and has a front face 14 defining an air chamber 15. As shown in FIG. 2, the air chamber 15 is a hole located in the middle of the air chamber 15, which is connected to the air passage 18 which in turn is connected to the air passage 19 of the handle 11 via the spring load trigger valve 20. Equipped with 17. The base of the handle 11 has a hole 21 grooved therein and the air chamber 15 through the handle 11 and the ventilation passages 19 and 18 in accordance with the relaxation of the trigger valve 20 of the compressed air source. You can pass by). On the front face 14 of the main body 13 is provided an annular support ring 22 having a flat rear face and a front face 23, 24, respectively. A support ring 22 with a protrusion 25 on one side is supported by the pin 26 between the front face 14 of the gun and a pair of webs 27 protruding from the adjacent handle. Thus, the support ring 22 is secured to the gun so as to pivot from the closed position as shown in FIG. 2 to the open position as shown in FIG. 1 so as to freely rotate downward from the air chamber 15.

L-shaped fastening member 28 is fixed to the upper rear of the body portion 13 via the pin 29. The fastening member 28 has a forwardly extending portion terminated at the tapered fastening portion 30 located in the cutout 32 formed around the support ring 22. As shown in FIG. 2, the fastening portion 30 has a shoulder portion 31 which is aligned with respect to the front face 24 of the support 22 to hold the support ring 22 in the closed position. The fastening member 28 is pressurized by a spring (not shown) to the fastening position shown in FIG. By pressing the rear end of the fastening member 28 as shown in FIG. 1, the fastening portion 30 releases the cutout 32 in the ring 22 so that the ring can be opened with respect to the pivot.

The combined breach / nozzle assembly 35 has a tapered inner cylindrical bore 36 that diverges towards the outer end 37 to define the nozzle portion 38. The inner cylindrical bore 36 defines a breach for a projectile (not shown). The combined breach / nozzle assembly 35 is detachably supported on the compressed air gun by a support ring 22 and slides on a locating surface 40 whose inner surface 39 is formed outside of the cylindrical portion of the breach. They are arranged to be adjacent to each other. The support ring 22 is positioned relative to the annular shoulder portion 41 formed on the outer truncated portion 42 parallel to the annular surface 43 of the similarly shaped inner truncated cone formed on the wall of the air chamber 15. The inner conical surface 43 of the air chamber 15 is provided with an annular groove 44 in which the appropriate 0-ring 45 is located. The 0-ring 45 is arranged to engage and seal with the conical face 42 of the annular shoulder portion 41 of the breach / nozzle assembly 35. In addition, the inner surface 30 of the support ring 22 is provided with an annular groove 46 in which the 0-ring 47 is located. The zero ring 47 forms a seal on the outer periphery of the nozzle / batch assembly 35.

When the support ring 22 is not engaged in the open position, the breach / nozzle assembly 35 is able to push the ring by sliding the narrow end 37 through the support ring 22. In this way several breach / nozzles are supported by rings, each having a different outer diameter corresponding to the different diameters of the hose or tube in which the compressed air gun is used.

Practically, the compressed air gun described above has a problem. Firstly, the relative position of the handle 11 relative to the main body 13 requires strong wrist movement when the nozzle 38 of the breach / nozzle assembly 35 corresponding to the gun is applied to the end of the hose or tube. Shall be. This extends the handle 11 to cross under the body 13 with the breach / nozzle assembly 35 attached thereto, so that the lever action generates a force applied when the nozzle is pushed into the hose or tube. Because it is required. Additional wrist actions cause the user to quickly fatigue.

In addition, various problems occur with the operation of the support ring 22. As shown in FIG. 1, when the support ring 22 is in the open position, there is nothing to protect the ring from pivoting downwards, thus crushing the user's finger on the trigger of the gun. Obviously this has to suffer, which is an undesired form of suggestion. More importantly, the fastening mechanism shown in FIGS. 1 and 2 can be operated without the breach / nozzle assembly 35 positioned in a suitable position sealingly engaged with the air chamber 15. In particular, due to the force required to push the inner conical part 42 of the breach / nozzle assembly 35 in the seal connected with the 0-ring 45 to the inner conical annular surface of the air chamber 15, 22 does not return to the fully closed position so that the cut-out 32 is not properly positioned behind the shoulder 31 on the fastening 30. When this situation occurs, the support ring 22 remains in a partially closed position and is held by the fastening portion 30 without the user noticing and having no sealed breach to the air chamber 15. The gun will be used. Without the sealing connection of the breach to the air chamber 15 it is not possible to improve the pressure sufficient at the rear of the projectile to be applied through the entire length of the hose or tube connected to the nozzle. In addition, there is a risk that the breach / nozzle assembly may be extracted under the pressure of compressed air, presenting a serious risk to the safety of the user and damaging the gun and other equipment.

3 to 7 show an embodiment of an improved compressed air gun, wherein the compressed air gun 50 has a handle 52 integrated into the main body portion 54, the main body portion 54 having a It has an annular cross-section air chamber 56 provided on the front side, which in turn is connected to the ventilation passage 62 on one side of the main body portion 54 via a spring loaded trigger valve assembly 64. It is equipped with a hole 58 located in the center while being connected to the ventilation path 60 to be connected. As can be clearly seen in FIGS. 4 and 5 and 6, one side of the main body portion 54 has an internally tapered air inlet 66 to which the compressed air source is coupled, thereby releasing the trigger valve. Air passes through the air passages 62 and 60 to reach the air chamber 56.

In FIG. 7, the trigger valve assembly 64 is rotatably installed within the hollow handle 52 and rotates at the lower end of the pin 72 extending across the bottom of the handle 52. A trigger 68 arranged to actuate 70). The trigger 68 is biased into the non-moving position by the coil spring 74 bearing against the side of the member opposite it. The rotatable member 70 can rotate in accordance with the movement of the trigger 68 in the hollow aperture 76 provided in the handle 52. Adjacent to the upper end 77, the rotatable member 70 is connected to the rear end of the valve shaft 78 of the valve 80 of the trigger valve assembly 64.

Moreover, the trigger valve assembly 64 has a nylon sleeve 82 installed in the inner aperture 84 of the body portion 54 of the gun. The nylon sleeve 82 is provided with two annular grooves on the outer surface in the two 0-rings 86 applied to provide a sealing relationship between the outer surface of the sleeve and the inner surface of the aperture 84. A number of holes 88 are provided in the sidewall of the sleeve 82 to allow passage of air from the outside to the inside of the sleeve 82. The valve 80 is supported in the central aperture of the sleeve 82 by a valve shaft 78 that is slipperyly received. The valve 80 is provided with a conical surface tapering towards the valve shaft 78 and is adapted to close the open end of the sleeve 82. The coil spring 90 biases the valve 80 to a sealing member connected to the inlet of the sleeve 82 to prevent passage of air through the valve assembly 64. 7 shows the position where the valve 80 is normally closed.

When the trigger 68 is depressed, the rotatable member 70 rotates along the pin 72 such that a force is exerted on the valve shaft 78 such that the upper end 77 of the member opens the valve 80. This allows passage of compressed air to the air chamber 56 through the ventilation passage 62, the inlet of the sleeve 82, the aperture 88, and the ventilation passage 60.

In detail, the compressed air source may be connected to the air inlet 66 which is internally fastened so that the air may pass through the ventilation paths 62 and 60 to the air chamber 56 according to the release of the trigger valve. . That is, when the valve 80 is opened, the compressed air passes through the air passage 80, the inlet of the sleeve 82, the hole 88 in the side wall of the sleeve 82, and the air through the air passage 60. Passed to chamber 56. Thus, compressed air passes from the air chamber 56 through the breach 96 to the nozzle 98 to allow the projectile to travel from the nozzle 98 to the end of the hose or tube.

The hand grip provided on the handle 52 is designed for the convenience and usefulness of the user so that the trigger valve 80 can be easily operated by pressing the trigger 68. Moreover, the grip is arranged on the handle 52 such that the user's hand grasping the handle partially lies at the central axis 94 of the air chamber 56 and the breach 96 in a sealed position. This structure requires little wrist lever action when the nozzle 98 is pushed into the end of the hose or tube, so the force required to push the nozzle to the end of the hose or tube causes the lever action on the handle 52 to be reduced. It can be applied directly along the axis 94 with very little.

Fastening member 100 is fixed to the upper surface of the main body portion 54 via the pin 102. The fastening member 100 has a front projection 104 projecting forward, which is formed around the support ring 108, similar to the gun shown in FIGS. 1 and 2. It is located in the cut-out section 106. Then, the front protrusion 104 of the fastening member 100 has a shoulder 110 that is exactly matched to the front face 112 of the ring to restrain the ring in the closed position as shown in FIGS. 3 and 4. Equipped. The fastening member 100 is constrained in the fastened position as shown in FIGS. 3 and 4 by the spring 113. When the rear end 114 of the fastening member 100 is pressed, the support ring 108 is rotated and opened as the front protrusion 104 is deviated from the cut-out part 106 of the support ring 108.

The spring 113 is located in the matching groove formed on the bottom surface of the fastening member 100 and the top surface of the main body portion 54, respectively. The inner lock assembly 116 including the protrusion 118 integrally formed on the bottom surface of the fastening member 100 has an upper end of the rotating member 70 when the rotating member 70 rotates by the operation of the trigger 68. It will rotate downwards at the restraining position (77). As shown in FIG. 7, even when the fastening member 100 is rotated to an unfastened position, the trigger 68 stops so that the upper end 77 of the rotating member 70 does not restrain the inner locking assembly 116. Will be in position. However, when the fastening member 100 is in a non-fastened position as shown, the upper end 77 of the rotating member restrains the protrusion 118 provided at the bottom of the fastening member 100. Pulling the trigger 68 will not trigger the trigger. Thus, the operation of the trigger valve assembly 64 to allow passage of compressed air is prohibited by the inner lock assembly 116 consisting of the protrusion 118 and the upper end 77 of the rotating member 70 in this embodiment. It becomes possible.

Thus, when the fastening member 100 is not in the fully engaged position, for example, the support ring 108 does not fully return to the closed position so that the shoulder 110 is located at the front side 112 of the support ring 108. Internal lock assembly 116 internally locks the trigger valve assembly 64 and permits the passage of compressed air to the breach 96, thereby positioning the cut-out portion 106 instead of the trigger valve assembly 64. Operation is prevented so that the operator can recognize that the breach 96 is not correctly positioned in the seal for the air chamber 56. The positioning of the breach 96 in the air chamber 56 is substantially the same as the gun shown in FIGS. 1 and 2, and a description thereof is omitted here.

In this embodiment, the inner locking assembly 116 is provided by the inner locking device between the rotating member 70 and the fastening member 100, the fastening member 100 is not in a position where the fastening member is fully fastened And a protruding portion 118 protruding downwardly designed to restrain the upper end 77 of the rotating member 70. Therefore, when the rear end 114 of the fastening member 100 rotates slightly downward, the protrusion 118 restrains the upper end 77 of the rotating member 70 to prevent the rotational movement of the rotating member 70. Done. As will be apparent to those skilled in the art, other types of inner lock assemblies may be employed to provide equivalent mechanical functionality.

The support ring 108 is rotationally attached to the main body portion 54 of the gun via a pair of webs 120 and a pin 122, similar to the gun configurations shown in FIGS. 1 and 2. However, as shown in FIGS. 4 and 6 and 7, the main body portion 54 has a lip 124 which is located proximate to the rotating pin 122 of the support ring 108. Lip 124 is designed to limit the extent to which the support ring 108 can rotate when the restraint is released by the fastening member 100. The lip 124 limits the extent to which the support ring 108 can rotate downward, thereby reducing the likelihood of injury to the operator. In addition, the lip 124 has the advantage of providing a support surface on which the support ring 108 can rest when inserting tubes or hoses of different sizes in place of nozzles.

A compressed air source between 100 and 1401 bf / sq.in. Is typically connected to the air inlet 66 of the gun to operate the gun. Specially designed projectiles in the form of polymer bullets, typically 20% larger than the inner diameter of the cleaned tubes or hoses, are positioned to exactly match the interior of the breach 96, using the fastening member 100 to secure the support ring 108. By releasing, the projectile is loaded into the breach 96, positioned at the rear of the breach / nozzle, and then the support ring 108 is closed towards the fastening member 100. As described above, the support ring 108 fully returns to the locked position with the shoulder 110 leaning against the front face 112 or the inner lock assembly 116 needs to prevent the trigger valve assembly 64 from operating. There is. The nozzle 98 of the breach / nozzle is then connected with the corresponding line, and the trigger valve assembly 64 operates to allow compressed air to flow toward the air chamber 56 to reach the cross section of the projectile in the nozzle 98. This air pressure causes the projectile to escape into the line through the nozzle 98, and the air pressure moves along the length of the line to remove all internal contamination. By using a detachable breach / nozzle for the support ring 108, bullets of a wide variety of sizes can be used.

In order to load bullets into hoses or tubes of different sizes, a number of detachable breach / nozzles are provided to connect the gun to the corresponding line.

8 (a) to 8 (c) and 9 show four different sized breach / nozzles for loading different size projectiles with a hose or tube. A projectile or bullet in a sealed position relative to the gun's air chamber 56 is inserted into the breach, where the support ring 108 is closed when the trigger 68 is activated to move the projectile toward the nozzle 98. It is assumed that it is returned to the fully closed position. When the projectile is delivered to the end of the hose or tube by pressure, the projectile is constrained at the inlet and loaded into the hose or tube under compression. The pressure may then slightly expand when the projectile enters the end of the hose or tube, but will remain substantially compressed while the projectile travels through the hose or tube.

The breach 96 of the nozzle shown in FIG. 8 has been modified to reduce the amount of metal used and thus the total amount of breach / nozzle. The breach 96 of each nozzle has an outer annular lip 126 having a reduced diameter compared to the breach on the nozzle employed in the gun disclosed in US Pat. No. 4,974,277. All conventional nozzles have a breach having an outside diameter designed to exactly match the gun's air chamber 56. However, in smaller nozzles a larger amount of metal is needed to form a larger diameter breach, which increases the weight of the overall gun. To attach a new breach / nozzle to the gun, an outer adapter ring 128 (see FIG. 10) and a support ring 108 having an outside diameter and profile that can restrain the lip 126 and can be received in the air chamber 56 ) Is provided. The outer circumferential surface 129 of the adapter ring 108 is designed to fit snugly in the support ring 108. The adapter ring is preferably made of acetal, which is a relatively low mass synthetic material compared to the metal of the breech / nozzle, thus reducing the overall weight of the breeze / nozzle and also reducing the overall weight of the gun using the breech / nozzle. It becomes possible. (A) of FIG. 10 is sectional drawing of the adapter ring 128, (b) of FIG. 10 is an enlarged view of a part of (a) of FIG. An inner surface of the adapter ring is provided with an annular groove, in which the circular ring 130 is received to provide a seal between the adapter ring and the breach / nozzle housed therein. Shown in FIGS. 3-7 are adapter rings.

The breeze / nozzle assembly shown in FIG. 9 is the same as that employed for the gun disclosed in US Pat. No. 4,974,277, and the outside diameter of the breach 96 is slightly smaller than the inside diameter of the air chamber 56 of the gun. However, the profile of the outer circumferential surface 97 of the breach 96 is modified like the outer circumferential surface 129 of the adapter ring 128 to provide a seal that is exactly matched to the support ring 108.

Various types of breach / nozzle assemblies may be employed in compressed air guns made of stainless steel, nylon or plastic material suitable for hoses, tubes or pipes of various diameters. In addition, the pneumatic gun can be used to launch a stringed projectile through a conduit, which can then be used to pull the electrical cabling through the conduit. The breach / nozzle assembly is provided with means for conveying the string when a string (eg, a low mass nylon string attached to the projectile) is launched through the conduit. In this application the projectile is chosen such that the projectile is slightly smaller in diameter than the inside diameter of the conduit. This application of pneumatic guns is particularly useful when electrical cabling must pass through multiple curved or edged conduits that cannot be traversed using conventional techniques.

Embodiments of the gun can be used with bullets typically having diameters ranging from 4 mm to 60 mm. Bullets are typically made of polyurethane foam pieces bonded together with contact cements to form rebond foam fragments, or made from pieces of virgin foam, or cut. It is made of columnar bullet bodies having a diameter as described above. Polyurethane foam pieces are cut at a particular size and joined at once by forming recombination foams having different densities within the range of densities C-30 to C-140. High density recombination foam is typically used to form bullets for use in compressed air guns in the range of C-110 to C-140, while high density net foams of similar density are used to enhance bullets. High density foam provides sufficient friction between the projectile and the wall of the tube or hose to remove all contaminants and is good at blocking air from the bullet body.

To further facilitate the removal of contaminants, an abrasive layer is bonded to the foamed sheet coated with the projectile cut to form a bullet with the abrasive layer on its front or back as shown in FIG. do. 11 shows a bullet body 131 composed of a polyurethane foam 132 and an abrasive layer 134 formed at one end thereof. The abrasive layer 134 is typically made of fibrous nylon or other plastic material similar to that used in the manufacture of scourers for domestic cleaning.

As shown in FIG. 12, the bullet body can be formed with two or more friction layers 134 by cutting the bullet body into a stacked sheet of an alternative layer of foam and abrasive. Bullets can also be prepared with an abrasive layer, for example in the form of silicon carbide coating applied to the whole or part of the outer surface thereof.

FIG. 13 shows another embodiment of the projectile used in addition to the above, wherein the cylindrical portion 132 of the projectile consists of a plurality of layers having different densities from adjacent layers of foam plastic material. In this embodiment, the layers extend structurally parallel to the normal direction of travel of the projectile so that they are all structurally parallel. The layers can then be stacked in order of increasing or decreasing density to suit other applications. Typically the density of the layers of foamed plastics material varies within the range of 80-200 Kgm ³ .

The range of density is controlled by several factors. First, if the overall density of the projectile is too low, compressed air will push the projectile through a hose or tube rather than through the projectile. On the other hand, if the density of the foamed plastics material is too high, the projectile cannot be compressed in the nozzle and will not proceed to the end of the hose or tube. Moreover, if the density of the projectile is too high, it will be impossible to overcome bending and other discontinuities in the hose or tube. Obviously the projectile will have two or more layers stacked on each other. In addition, the projectile is sterilized, sterilized or oiled and then sealed sealed for use in a variety of applications requiring high standard cleanliness and cleanliness. The absorbent properties of the foamed plastic material are used in the projectile means, which are filled with appropriate reagents to facilitate the cleaning and / or coating of the inner surface of the tube or hose through which they are fired.

The projectile may also have one or more annular grooves 136 on its outer surface that serve as traps for contaminants while they pass through a hose or tube.

The gun and the projectile of the present invention have various applications in the infinite list of industries as follows.

1. Hydraulics 8. Painting

2. Aerodynamics 9. Desalination

3. Food and Beverages 10. Descaling

4. Powder coating 11. Rust proofing

5. Cleaning / Oiling of Gun Barrels 12. Air Conditioning

6. Plumbing and irrigation 13. Refrigeration

7. Medicine 14.Gas (facilities and services)

Depending on the application, the gun can be made from any suitable material, such as stripped aluminum alloy, stainless steel or hard plastic and other synthetic materials.

As will be apparent from the detailed description of the embodiments of the present invention, it is possible to provide improved aerodynamic guns and projectiles with advantages over previous guns. Another advantage not described above is to reduce the size of the main body 54 and reduce the overall weight of the gun by installing a hollow bore 76 in the handle 52 of the gun. In addition, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made by those skilled in the art without departing from the gist of the basic invention. For example, in the above embodiment the breach is supported to block activation to the air chamber 56 by a support ring 108 which is rotationally locked to the body of the gun, but this can be done by other means as well as the configuration for supporting the breach. Do. For example, the support ring need not be locked to the body of the gun, but instead may be secured by two or more fasteners similar to the fastening member 100. Indeed, by using a plurality of fasteners or clamps to secure the breach around the air chamber, the support ring is not completely necessary. Those skilled in the art will be able to easily modify the inner lock assembly described above to provide similar safe mechanisms for alternative configurations.

Claims (15)

A ventilation passage connected to the air chamber via a trigger valve means arranged to be connected to the compressed air source, a detachable breech adapted to be supported in a sealed position where the breech is sealed to the air chamber, and the breech supported in the sealed position Compressed air, characterized in that it is provided with an internal locking assembly adapted to internally lock the trigger valve means when the breach is not sealed to the air chamber, thereby preventing the use of the trigger valve means to allow passage of compressed air in use. key. 2. The support of claim 1 wherein the breach is coaxially supported by a support ring movably from an open position while being detachable in a closed position with respect to an air chamber, wherein the inner lock assembly is sufficiently positioned to a position in which the support ring is closed. Compressed air gun, characterized in that the inner lock with the trigger valve means if not returned. 3. The compressed air gun as recited in claim 2, wherein the releasable fastening member is arranged to engage the support ring to hold the ring in the closed position. 4. The use of claim 3, wherein the inner locking member is made of an pivotable member operatively coupled to the trigger valve means and adapted to rotate upon operation of the trigger valve means so that the support ring is fully returned to the closed position in use. And the pivotable member is connected to the releasable fastening member so as to prohibit the operation of the trigger valve means. 5. The compressed air gun as recited in claim 4, wherein said releasable fastening member is provided with a projection on its lower surface, and said pivotable member is biased toward a position where said projection does not normally connect said projection. 6. The compressed air gun as claimed in claim 2, wherein the support ring is pivotally fixed to the body of the gun. 7. 6. The handle according to any one of claims 2 to 5, further comprising a handle formed such that the user's hand holding the handle while being incorporated into the body portion of the gun can at least partially lie on the breach in the seal position and the central axis of the air chamber. Compressed air gun, characterized in that configured. 3. The compressed air gun as recited in claim 2, further comprising an adapter ring having an outer diameter corresponding to the support ring and an inner diameter for receiving the breach on its coaxial axis. A projectile of a bullet-shaped compressed air gun comprising a cylindrical upper portion formed of a plastic material and at least one abrasive material layer adhered to the cylindrical upper portion to increase the cleaning property of the bullet body. 10. The projectile of claim 9, wherein the first layer of abrasive material is adhered to the front surface of the cylindrical upper portion of the bullet in a plane substantially perpendicular to the normal direction of bullet movement. 10. The projectile of claim 9, wherein an abrasive material in the form of an abrasive coating is applied to the outer peripheral surface of the cylindrical upper portion of the bullet. Projectile for a compressed air gun in the form of a bullet body consisting of a cylindrical top of a plastic material, each layer consisting of a plurality of layers each of which is formed of a plastic material having a different density than the adjacent layer. 13. The projectile of claim 12, wherein the layer extends substantially perpendicular to the normal direction of projectile movement. 14. The projectile of claim 13, wherein the layer is plated to increase or decrease density. The projectile of any one of claims 9 to 11, further comprising an annular groove provided on an outer peripheral surface of the cylindrical upper portion of the bullet while serving as a trap for contaminants in use.