The present application is based on and claims the benefit of priority of Japanese Patent Application No. 2009-198006 filed on Aug. 28, 2009, the entire contents of which is incorporated herein by reference.
The present invention relates to a toy gun so configured that pressure arising from compressed gas is applied to a bullet to fire it off by a user pulling the trigger.
There are conventionally toy guns so configured that pressure arising from compressed gas is applied to a bullet to fire it off by a user pulling the trigger. (An example is the automatic toy gun described in Japanese Unexamined Patent Publication No. Hei 10 (1998)-197200.) This type of toy gun is used by toy gun enthusiasts for fun in target shooting (plinking) or the like at home.
The automatic toy gun described in Japanese Unexamined Patent Publication No. Hei 10 (1998)-197200 is of open bolt type. Brief description will be given to the action of a forward/backward action bolt 11 observed when bullets are fired off from this automatic toy gun. When the trigger 1 is pulled with the forward/backward action bolt 11 in a standby position close to the rear end of the gun, the following takes place: a recoil spring 27 pushes the forward/backward action bolt 11 and a hammer 21 integrally provided on the forward/backward action bolt 11 hits a opening/closing valve member 51. As the result of hitting by the hammer 21, a bullet BB receives gas pressure and is accelerated in the direction toward the front end of a gunbarrel 2 and fired off from the gun. Substantially immediately after the bullet BB is fired off from the gunbarrel 2, the forward/backward action bolt 11 starts to move back in turn due to gas pressure from an accumulator 50 and the biasing force of a rebound spring 29.
Many toy gun users request of a toy gun that it not only fires off bullets but also provides functions and the sense of use similar to those of real guns. In a toy gun so configured that a valve is opened and closed in conjunction with the movement of a bolt in the back and forth direction of a gunbarrel and a bullet is thereby loaded and fired off, the following is implemented: high impact is produced by the movement of the bolt and this makes it possible to obtain the sense of use close to that of a real gun. For this reason, toy guns so configured that a bolt is moved and bullets are thereby fired off are more popular than toy guns with a fixed bolt.
The toy gun described in Japanese Unexamined Patent Publication No. Hei 10 (1998)-197200 is so configured that the following is implemented: a bolt moves forward and hits a valve and thereby opens the valve to fire off a bullet; and after the bolt thereafter moves back, the valve is closed. As mentioned above, this toy gun provides the sense of use close to that of a real gun. In case of this toy gun, however, the hammer, the valve, and bullets are not positioned in alignment. If the hammer, the valve, and bullets exist in alignment, it must be possible to further reduce the size of a bullet firing mechanism and more efficiently apply gas pressure to bullets. Aside from the automatic toy gun described in Japanese Unexamined Patent Publication No. Hei 10 (1998)-197200, an open bolt-type toy gun in which a hammer, a valve, and bullets exist substantially in alignment is possible. This will be designated as toy gun in virtual case.
This toy gun in virtual case is equipped with a movable bolt. This bolt has at its rear part a space (variable volume pressure chamber) into which air or gas flows. This variable volume pressure chamber is a space into which gas flows after a bullet is fired off. Gas that flowed into this variable volume pressure chamber pushes the bolt backward by its pressure. As long as the variable volume pressure chamber is filled with gas, the gas continuously pushes the bolt backward. That is, the above bolt moves backward after a bullet is fired off. This bolt breaks away from a valve body immediately before it arrives at the backmost retreat position. This removes the airtightness in the bolt and the gas in the variable volume pressure chamber is discharged to the atmosphere. As a result, the pressure of the gas in the variable volume pressure chamber is reduced.
For this reason, the following takes place in the toy gun in virtual case: the time for which the bolt continuously receives pressure from gas is lengthened as the closed-end cylindrical portion forming the variable volume pressure chamber becomes longer. As a result, the recoil shock given to the user by the toy gun in virtual case is also increased.
However, lengthening the closed-end cylindrical portion poses another problem. As the closed-end cylindrical portion becomes longer, the distance the bolt travels until it hits the hammer after it is fit into the closed-end cylindrical portion is lengthened. As a result, the air in the closed-end cylindrical portion functions as if it were a buffer material (air cushion) and this reduces the impact by which the bolt hits the hammer. If the recoil spring is strengthened to increase the impact by which the hammer is hit to solve the above problem, a new problem would arise. The recoil shock produced when the bolt is moved backward by gas pressure is reduced.
Accordingly, an object of the present invention is to produce high impact when a bullet is fired off with a toy gun so configured that a bullet is fired off by gas pressure and at the time of blowback and further simultaneously achieve smooth bullet firing and blowback actions.
According to the present invention, A toy gun includes a barrel extended in the back and forth direction of a gunbarrel, a valve body formed in the shape of a cylinder extended in the back and forth direction of the gunbarrel, having an air chamber to be filled with compressed gas formed therein, communicating with the rear-side end of the barrel on the front side, and having a through hole penetrating the valve body in the back and forth direction of the gunbarrel formed on the rear side, a discharge valve positioned in the valve body and so provided that the discharge valve can be displaced between a closed position where the communication between the barrel and the air chamber is shut and an open position, located in front of the closed position, where the communication between the barrel and the air chamber is opened, a discharge valve spring pushing the discharge valve backward and positioning the discharge valve in the closed position, a bolt provided so that the bolt can freely slide in the back and forth direction of the gunbarrel, including a fit receiving portion which has an opening and to which the outer circumferential surface of the valve body on the rear side is fit through the opening and an abutment portion provided on the bottom portion of the fit receiving portion opposite the opening, and displaced between a pressing position where the abutment portion is abutted against the discharge valve and the discharge valve is positioned in the open position and a retreat position, behind this pressing position, where the abutment portion is caused to break away from the discharge valve, a bolt spring pushing the bolt forward, a communicating portion provided at the bottom portion of the bolt, an opening/closing body including a slidable shank which is inserted into the communicating portion and forms an air gap between the shank and the inner circumferential surface of the communicating portion, a lid portion which is provided at the front end of the shank and has such a shape as to cover the communicating portion, and a coming-off preventing portion which is provided on the shank and prevents the opening/closing body from coming off forward, and an opening/closing body spring pushing the opening/closing body forward.
A more complete appreciation of the present invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:
Description will be given to an embodiment with reference to
First, description will be given to each part provided in the front portion of the toy gun 101. The toy gun 101 includes a frame 111 that forms an enclosure, a magazine 112, a barrel 113, and a bullet feed plate 114. In this embodiment, the frame 111 forms part of the gunbarrel and defines the back and forth direction of the toy gun 101. The magazine 112 and the barrel 113 are protruded from the frame 111 forward of the toy gun 101. The magazine 112 and the barrel 113 may be not protruded from the frame 111 but be housed in the frame.
The magazine 112 is a cylindrical member with one end being a closed end 112a and is capable of housing bullets B therein. A magazine spring 112b is attached to the inner side face of the closed end 112a in the magazine 112. At the end of the magazine spring 112b on the opposite side to the closed end 112a, a magazine follower 112c that pushes bullets B is attached. Bullets B are guided into the magazine 112 through an open end 112d of the magazine 112. Instead, an opening may be provided in the magazine 112 in an appropriate place other than the open end 112d and a bullet B may be guided in through this opening. The magazine 112 with bullets B housed therein is attached to the front side of the frame 111 with its open end 112d pointed backward of the toy gun 101. The magazine 112 may be detachable from the frame 111 or may be fixed in the frame.
The barrel 113 is a cylindrical member and extended in the back and forth direction of the gunbarrel. The front end of the barrel 113 is the muzzle 103. The inside diameter of the barrel 113 is slightly larger than the diameter of each bullet B. The barrel 113 is positioned under the magazine 112 on the front side of the frame 111.
The bullet feed plate 114 is a rectangular parallelepiped member. The bullet feed plate 114 is perpendicular to the magazine 112 and is placed in the frame 111. The bullet feed plate 114 is supported by a guide member (not shown) placed in the frame 111 and can be moved in the vertical direction. The open end 112d face of the magazine 112 attached to the frame 111 and the open end 103a face of the barrel 113 on the opposite side to the muzzle 103 are abutted against the surface of the bullet feed plate 114 facing forward.
The bullet feed plate 114 has a bullet retention hole 114a in a position opposite the open end 112d of the magazine 112. This bullet retention hole 114a is a hole in a size sufficient to house a bullet B. The lower end face of the bullet feed plate 114 is coupled to a bullet feed plate spring 115. The other end of the bullet feed plate spring 115 on the opposite side to the bullet feed plate 114 is coupled to the inner bottom face 111a of the frame 111. The bullet feed plate spring 115 pushes the bullet feed plate 114 upward and opposes the bullet retention hole 114a to the open end 112d of the magazine 112.
The bullet feed plate 114 has a slope 114b at its lower part. The slope 114b is inclined so that it ascends form the rear to the front of the toy gun 101. The bullet feed plate 114 has a space 114c through which the tip portion of a bolt 121 (described later) can pass above the slope 114b.
A bullet B in the magazine 112 attached to the frame 111 is pushed out by the magazine follower 112c due to the biasing force of the magazine spring 112b. It is then housed in the bullet retention hole 114a in the bullet feed plate 114. When the bolt 121 advances forward and pushes the bullet feed plate 114 downward, the bullet B is positioned in a position opposite the open end 103a of the barrel 113. (Refer to
Description will be given to each part provided in the middle of the toy gun 101 with reference to
The bolt 121 is a cylindrical member extended in the back and forth direction of the toy gun 101. The bolt 121 is so provided that it can freely slide in the back and forth direction of the toy gun 101 and can reciprocate between a pressing position 121A (Refer to
The bolt 121 has an opening 121g open forward. The bolt 121 has at its rear part a closed end 121d that forms the bottom portion opposite the opening 121g. The bolt 121 has a fit receiving portion 121i at its rear part. The fit receiving portion 121i has the opening 121g and the closed end 121d at both its ends and its side face is cylindrically covered. The outer circumferential surface of the valve body 122 on the rear side is fit into this fit receiving portion 121i through the opening 121g.
The bolt 121 has a protruded portion 121a protruded upward from its upper surface. The lower part of the bolt 121 on the opening 121g side is extended forward. The bolt 121 has a forward slope 121b on the under surface of this portion extended forward. The forward slope 121b is inclined upward as it goes from the rear to the front.
One end of the bolt spring 124 is abutted against the outer surface of the closed end 121d of the bolt 121. The other end of the bolt spring 124 is abutted against the inner surface 111b of the rear part of the frame 111. The bolt spring 124 pushes forward the bolt 121 positioned in the retreat position 121B. (Refer to
The bolt 121 has a locking projection 121f. The locking projection 121f is extended from the under surface on the closed end 121d side.
The bolt 121 has an abutment portion 121e on the inside surface side of the closed end 121d. The abutment portion 121e is fit into a fitting hole 122f (described next) located at the rear end of the valve body 122.
The valve body 122 is a cylindrical member extended in the back and forth direction of the gunbarrel and forms therein the air chamber 126 to be filled with compressed gas. The outside diameter of the valve body 122 is smaller than the inside diameter of the bolt 121. The valve body 122 enters the bolt 121 through the opening 121g and can freely slide in the back and forth direction in the bolt 121. In the area at the front part of the toy gun 101 in the space in the valve body 122, a space 122g is ensured for the discharge valve 123 (described later) to slide forward.
The valve body 122 has a rear lid 122a at its rear end. The ring-shaped packing 122c is attached to the end face of the rear lid 122a facing forward. The rear lid 122a has the through hole 122b. The through hole 122b penetrates the rear lid in the back and forth direction of the gunbarrel and lets the exterior of the valve body 122 and the interior of the discharge valve 123 communicate with each other. The rear part of the through hole 122b forms the fitting hole 122f large in inside diameter. The abutment portion 121e provided on the bolt 121 is fit into the fitting hole 122f from outside the valve body 122. A slide projection 123b (described later) provided on the discharge valve 123 enters the through hole 122b from inside the valve body 122. This slide projection 123b is protruded to the fitting hole 122f side.
Description will be given with reference to
The discharge valve 123 is a cylindrical member and its front end face is open. The outside diameter of the discharge valve 123 is smaller than the inside diameter of the valve body 122. This discharge valve 123 is positioned in the valve body 122 and forms the air chamber 126 between the valve body 122 and the discharge valve 123.
The discharge valve 123 has a flange portion 123a and a slide projection 123b at its rear end area. The flange portion 123a is protruded from the outer circumferential surface of the discharge valve 123 in the radial direction. The slide projection 123b is protruded from the rear end face of the discharge valve 123.
In the front end area of the outer circumferential surface of the discharge valve 123, an O-ring 127 and a washer 128 are installed. As illustrated in
In
Further, when the flange portion 123a and the packing 122c break away from each other, the compressed gas also enters the air gap S and passes through the through hole 122b as indicated by arrows in
When the discharge valve 123 moves forward, the discharge valve spring 129 pushes back the discharge valve 123. This causes the discharge valve 123 to slide backward and the flange portion 123a is brought into tight contact with the packing 122c. As a result, the air chamber 126 becomes air-tight again. In the air-tight state, the air chamber 126 is filled with compressed gas supplied from the compressed gas cylinder 102.
Description will be back to
The trigger 105 is positioned in front of the grip 104 (not shown in
The trigger spring 131 is positioned behind the operating portion 105d. The trigger spring 131 is attached to the frame 111. The trigger spring 131 pushes the trigger 105 clockwise and pushes the trigger 105 positioned in the firing position 105A back to the non-firing position 105B. When an operator pulls the operating portion 105d backward with his/her finger, the trigger 105 is positioned in the firing position 105A. When the operator thereafter removes his/her finger from the operating portion 105d, the trigger 105 is displaced to the non-firing position 105B.
The bolt sear 132 is provided above the bolt sear push-up portion 105c and under the bolt 121 in a position sandwiched between them. The bolt sear 132 is attached to the frame 111 so that it can be freely rotated around a shaft center 132a. The bolt sear 132 includes a flat plate-like forward protruded portion 132b and a backward protruded portion 132c fanned as laterally viewed. The forward protruded portion 132b is protruded forward of the shaft center 132a. The backward protruded portion 132c is protruded backward of the shaft center 132a. The upper part of the backward protruded portion 132c is a stopper portion 132d for stopping the locking projection 121f of the bolt 121. The bolt sear spring 133 is abutted against the under surface of the backward protruded portion 132c. The bolt sear spring 133 rotates the bolt sear 132 counterclockwise. When the bolt sear push-up portion 105c pushes upward the under surface of the forward protruded portion 132b in this bolt sear 132, the following takes place: the stopper portion 132d is displaced downward and the bolt sear 132 is positioned in a permission position 132A (the position of the bolt sear 132 indicated by an alternate long and short dash line). The permission position 132A refers to a position where the stopper portion breaks away from the path of the movement of the locking projection 121f of the bolt 121 and the reciprocating motion of the bolt 121 in the back and forth direction is permitted. Meanwhile, when the bolt sear push-up portion 105c breaks away from the bolt sear 132, the following takes place: the stopper portion 132d is displaced upward by the bolt sear spring 133 and the bolt sear 132 is positioned in an arrest position 132B (the position of the bolt sear 132 indicated by a solid line). The arrest position 132B refers to a position where the stopper portion interferes with the path of the movement of the locking projection 121f of the bolt 121 and the reciprocating motion of the bolt 121 is arrested.
More detailed description will be given to the structure of the bolt 121 with reference to
The closed end 121d that forms the bottom portion of the bolt 121 is provided with a cylindrical body 151 as a communicating portion. The cylindrical body 151 is protruded from the closed end 121d of the bolt 121 both in the forward direction and in the backward direction. It lets the interior of the fit receiving portion 121i and the exterior of the bolt 121 communicate with each other. Inside the fit receiving portion 121i, an opening/closing body spring 152 is attached to the cylindrical body 151. The opening/closing body spring 152 is a linear coil and is so placed that it is wound around the cylindrical body 151.
The cylindrical body 151 has an opening/closing body 153 attached thereto. The opening/closing body 153 includes a shank 154, a lid portion 155, and a coming-off preventing portion 156. The shank 154 is a rod-like member extended in the back and forth direction of the gunbarrel and its diameter is smaller than the inside diameter of the cylindrical body 151 and its length is larger than the length of the cylindrical body 151. The shank 154 is inserted into the cylindrical body 151 and can freely slide in the back and forth direction of the gunbarrel. The shank 154 forms an air gap T between it and the inner circumferential surface of the cylindrical body 151. The lid portion 155 is a disk-like member having a size sufficient to cover an end face of the cylindrical body 151. The lid portion 155 is provided at the front end of the shank 154. The coming-off preventing portion 156 is a member provided at the rear end of the shank 154. When the shank 154 moves forward, the coming-off preventing portion 156 hitches on the end face of the cylindrical body 151 and prevents the opening/closing body 153 from coming off forward. In this embodiment, the shank 154 and the lid portion 155 are integrally formed. The coming-off preventing portion 156 has a hook portion (not shown) protruded to the left side (forward) in
The opening/closing body 153 and the opening/closing body spring 152 are attached to the bolt 121 as described below. First, a worker attaches the opening/closing body spring 152 around the cylindrical body 151 protruded inward of the bolt 121. Subsequently, the worker inserts the shank 154 into the cylindrical body 151 protruded inward of the bolt 121 and positions the shank 154 and the lid portion 155 inside the bolt 121. Next, the worker fits the hook portion (not shown) of the coming-off preventing portion 156 onto the shank 154 protruded from the end of the cylindrical body 151 outside the bolt 121. As a result, as illustrated in
In
As a modification, the coming-off preventing portion 156 may break away from the outer end face of the cylindrical body 151.
Here, it is important that the following is implemented even though the volume of the space SP encircled by the fit receiving portion 121i and the rear lid 122a of the valve body 122 is reduced with the forward movement of the bolt 121: the air in this space SP is discharged to outside the bolt 121 through the flow path U. As a result, the momentum of the advance of the bolt 121 pushed by the bolt spring 124 is not suppressed by the air in the fit receiving portion 121i.
When the lid portion 155 pushes the slide projection 123b, the lid portion 155 is pushed by the slide projection 123b. As a result, the opening/closing body 153 slides backward along the cylindrical body 151. Consequently, the lid portion 155 closes the end face of the cylindrical body 151.
Here, it is important that such a gap as to form a flow path U is not produced between the lid portion 155 and the cylindrical body 151. For this reason, the compressed gas that goes through the air gap S and pushes the lid portion 155 does not leak to outside the bolt 121 and produces pressure that pushes the bolt 121 backward. This makes it possible for the user of the toy gun 101 to feel high impact from the bolt 121 moving backward.
Description will be given to the action of each part that occurs when a user uses the toy gun 101 with reference to
In process of the bolt 121 moving backward, the locking projection 121f of the bolt 121 is abutted against the upper surface of the stopper portion 132d of the bolt sear 132 and climbs over the stopper portion 132d. After the locking projection 121f climbs over the stopper portion 132d, the bolt sear 132 is rotated counterclockwise by the elastic force of the bolt sear spring 133. At this time, the bolt 121 becomes apt to move forward of the toy gun 101 by the elastic force of the bolt spring 124. However, the locking projection 121f of the bolt 121 hitches on the stopper portion 132d and does not move forward any more.
When the user pulls the trigger 105 backward in this state, the trigger 105 rotates counterclockwise and the bolt sear push-up portion 105c displaces the forward protruded portion 132b of the bolt sear 132 upward to rotate the bolt sear 132 clockwise. This removes the engagement between the locking projection 121f of the bolt 121 and the stopper portion 132d of the bolt sear 132. Thereafter, the bolt 121 is pushed by the bolt spring 124 and moves forward.
As described with reference
The bolt 121 is pushed by compressed gas and rapidly moves backward. At this time, the opening/closing body 153 is kept positioned backward of the cylindrical body 151 and the space SP encircled by the fit receiving portion 121i and the rear lid 122a does not communicate with the outside. For this reason, the compressed gas that flowed into the space SP is all used as power for pushing the bolt 121 backward.
While the user pulls and keeps the trigger 105 backward, the bolt sear push-up portion 105c keeps pushing the forward protruded portion 132b of the bolt sear 132 upward. For this reason, the stopper portion 132d of the bolt sear push-up portion 105c remains downward. As a result, the bolt 121 is not stopped by the bolt sear 132 and moves backward as far as it will go and is then pushed by the bolt spring 124 and starts to move forward in turn. Thus the bolt 121 receives the elastic force of the bolt spring 124 and the pressure of the compressed gas and makes reciprocating motion. While it reciprocates once, it is abutted against and breaks away from the discharge valve 123 to open and shut the communication between the barrel 113 and the air chamber 126. In the toy gun 101, then, the action illustrated in
In the toy gun 101 in this embodiment, as mentioned above, the following is implemented while the bolt 121 moves forward: the flow path U for discharging the air in the fit receiving portion 121i to the outside is ensured; and the air in the fit receiving portion 121i flows along the flow path U and is discharged to the outside through the cylindrical body 151. For this reason, impact produced when the bolt 121 pushes the discharge valve 123 is not reduced. When the bolt 121 receives the force of the compressed gas after a bullet B is fired off, the lid portion 155 has closed the cylindrical body 151 and the compressed gas that has flowed into the fit receiving portion 121i is not discharged to the outside. For this reason, the pressure of compressed gas pushing the bolt 121 backward is not reduced. This makes it possible to implement the following with the toy gun 101 so configured as to fire off bullets by gas pressure: the impacts produced when bullets B are fired off and at the time of blowback can be made close to those from a real gun and firing of bullets B and the action of blowback can be smoothly carried out.
Description will be given to another embodiment with reference to
In this embodiment, further, the cylindrical body 151 has an opening/closing body spring receiving portion 157 at its outer end. The opening/closing body spring receiving portion 157 is protruded inward from the outer end face of the bolt 121 like a ring. One end of the opening/closing body spring 152 is abutted against the lid portion 155 and the other end is abutted against the opening/closing body spring receiving portion 157.
Also in the toy gun 101 in this embodiment, the air in the fit receiving portion 121i is discharged to the outside through the cylindrical body 151 when the bolt 121 advances. Meanwhile, when the bolt 121 receives the force of compressed gas after a bullet B is fired off, the compressed gas that has flowed into the fit receiving portion 121i is not discharged to the outside. For this reason, the following can be implemented in the toy gun 101 so configured as to fire off bullets by gas pressure: the impacts produced when bullets B are fired off and at the time of blowback can be made close to those from a real gun. In the toy gun 101 in this embodiment, further, the length of the cylindrical body 151 can be reduced and the shank 154 or the lid portion 155 provided in the opening/closing body 153 does not deeply enter the fitting hole 122f. For this reason, the structure is simplified and a problem is less prone to occur in the fit receiving portion 121i of the bolt 121.
Description will be given to another embodiment with reference to
In this embodiment, the closed end 121d has a recessed portion 121j in its inner surface. The recessed portion 121j is recessed from the closed end 121d backward of the toy gun 101. The lid portion 155 of the opening/closing body 153 is positioned in the recessed portion 121j. The opening/closing body spring 152 pushes the lid portion 155 forward and positions the front surface of the lid portion 155 in a position where it is flush with the inner surface of the closed end 121d.
Also in the toy gun 101 in this embodiment, the air in the fit receiving portion 121i is discharged to the outside through the cylindrical body 151 when the bolt 121 advances. For this reason, ahead power is not diminished. Meanwhile, when the bolt 121 receives the force of compressed gas after a bullet B is fired off, the compressed gas that has flowed into the fit receiving portion 121i is not discharged to the outside. For this reason, the following can be implemented in the toy gun 101 so configured as to fire off bullets by gas pressure: the impacts produced when bullets B are fired off and at the time of blowback can be made close to those from a real gun. In the toy gun 101 in this embodiment, further, the structure of the following area is simplified: the area where the slide projection 123b of the discharge valve 123 and the abutment portion 121e of the bolt 121 collide with each other in the fit receiving portion 121i. Therefore, a problem is less prone to occur in this area.
In the above description, the continuous firing toy gun 101 has been taken as examples of the first embodiment, second embodiment, and third embodiment. As other embodiments, the cylindrical body 151, opening/closing body spring 152, and opening/closing body 153 can also be applied to single firing toy guns and burst toy guns.
Obviously, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.
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