Title:
Micro-roller sliding system for guiding movable gun parts involved in projectile discharge
Kind Code:
A1


Abstract:
The present invention relates to firearms requiring the smooth operation of slidably engaged subassemblies for effecting projectile loading, maintenance, triggering, discharge, or reloading of a projectile. The major drawback of the prior art, such as that applying to slide-action pistols, is that friction occurs unevenly and at high levels between moving parts, which leads to damaging levels of frictive heat, wear, or warping, as well as jamming. The slidable guidance system proposed herein addresses this drawback by employing micro-rollers whose surfaces do not at any one point constantly touch the slidable gun part(s) with which they come in contact. Preferably, at least a set of micro-rollers and a pair of channels are installed in the inner sides of a slide and the upper outer sides of a gun frame, or on the lower face of a slide-housed slidable barrel and the upper face of a gun frame.



Inventors:
Nakatani, Hideyuki (Osaka, JP)
Application Number:
10/193762
Publication Date:
01/15/2004
Filing Date:
07/12/2002
Assignee:
Sheriff Company, LTD. (Osaka, JP)
Primary Class:
Other Classes:
42/75.03
International Classes:
F41A3/64; F41A25/24; (IPC1-7): F41A21/00; F41C3/00
View Patent Images:
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Primary Examiner:
CLEMENT, MICHELLE RENEE
Attorney, Agent or Firm:
Hidayuki Nakatani (Osaka, JP)
Claims:

What is claimed is:



1. A sliding system for guiding slidably engaged parts of a gun, comprising: a frame; a slidable unit installed on the upper part of the frame and freely movable in an alternating longitudinal direction relative to the frame; guide members rotatably and multiply disposed on the lower part of the slidable unit, the guide members being elastic and resilient rollers; so that the movement of the slidable unit is smoothly and stably guided.

2. The sliding system of claim 1, wherein guide channels in the form of parallel longitudinal recesses are made in or on the upper part of the frame such as to supportively engage the guide members, so that the movement of the slidable unit is guided smoothly and stably.

3. The sliding system of claim 1, wherein the guide members are rotatably and multiply disposed on the upper part of the frame.

4. The sliding system of claim 1, wherein the guide members are rotatably and multiply disposed on the upper part of the frame, and wherein guide channels in the form of parallel longitudinal recesses are made in or on the lower part of the slidable unit, so that the movement of the slidable unit is guided smoothly and stably.

5. The sliding system of claim 1, wherein each of the guide members has a centering axis materially manifested in the form of guide posts.

6. The sliding system of claim 1, wherein the guide members are made of a resilient and slippery polymer.

7. The sliding system of claim 1, wherein the guide members house roller bearings made of a resilient material.

8. A sliding system for guiding slidably engaged parts of an automatic pistol, comprising: a frame; a slide mounted on the frame and freely movable in an alternating longitudinal direction relative to the frame; a barrel extending through the slide and freely movable in an alternating longitudinal direction relative to the slide; guide members rotatably and multiply disposed on the lower part of the slide, the barrel, or both the slide and the barrel, the guide members being elastic and resilient rollers; so that the movement of the slide or the barrel is smoothly and stably guided on the frame.

9. The sliding system of claim 8, wherein guide channels in the form of parallel longitudinal recesses are made in or on the upper part of the frame such as to supportively engage the guide members, so that the movement of the slide or the barrel is guided smoothly and stably.

10. The sliding system of claim 8, wherein the guide members are rotatably and multiply disposed on the upper part of the frame.

11. The sliding system of claim 8, wherein the guide members are rotatably and multiply disposed on the upper part of the frame, and wherein guide channels in the form of parallel longitudinal recesses are made in or on the lower part of the slide and the barrel, so that the movement of the slide or the barrel is guided smoothly and stably.

12. The sliding system of claim 8, wherein the guide members are rotatably and multiply installed on guide rails, the guide rails being arranged at parallel longitudinal positions on the lower face of the barrel or on the inner sides of the slide, so that the movement of the slide or the barrel is guided smoothly and stably.

13. The sliding system of claim 8, wherein the guide members are rotatably and multiply installed on guide rails, the guide rails being arranged at parallel longitudinal positions on the upper face of the frame, so that the movement of the slide or the barrel is guided smoothly and stably.

14. The sliding system of claim 8, wherein guide members are mounted on the lateral and lower surfaces of guide rails, the guide rails being arranged at parallel longitudinal positions on the lower face of the barrel or on the inner sides of the slide, so that the movement of the slide or the barrel is guided smoothly and stably.

15. The sliding system of claim 8, wherein the guide members are fixed guide protuberances mounted on the lateral and lower surfaces of guide rails, the guide rails being arranged at parallel longitudinal positions on the lower face of the barrel or on the inner sides of the slide, so that the movement of the slide or the barrel is guided smoothly and stably.

16. The sliding system of claim 8, wherein the guide members are directly installed on the barrel or the slide at points along a gap between the the outer surface of the barrel and the inner surface of the slide, the outer surface of the guide members touching the barrel, the slide or both the barrel and the slide, so that the interactive movement of the barrel and the slide is guided smoothly and stably.

17. A sliding system for guiding slidably engaged parts of a gun, comprising a slidable unit mounted on or in the upper part of the gun, the slidable unit being cylindrical in form; a second slidable unit partially or fully extending through the slidable unit and slidably engaged with the slidable unit in an alternating longitudinal direction relative to the slidable unit, the second slidable unit being cylindrical in form; guide members rotatably and multiply disposed on the inner surface of the slidable unit, the guide members being micro-rollers made of a resilient and elastic material; so that the second slidable unit and the sliding unit are guided stably and smoothly.

18. The sliding system of claim 17, wherein the guide members are mounted on the outer surface of the second slidable unit.

19. The sliding system of claim 17, wherein the guide members are made of a resilient and slippery polymer.

20. The sliding system of claim 17, wherein the guide members are rotatably and multiply disposed on the upper part of the gun on a frame, and wherein the slidable unit is a bolt, so that the movement of the bolt is guided smoothly and stably.

Description:

BACKGROUND OF THE INVENTION

[0001] The present invention relates to firearms and toy guns requiring the smooth, low-friction operation of movable subassemblies for effecting projectile loading, maintenance, triggering, discharge, or reloading of a projectile. The slide action or “blowback” genus of gun, which features a slide that moves longitudinally back and forth relative to a barrel and a gun body, is perhaps the best known of this type of firearm. Japanese Patent No. 10220991 (Terada) is one instance of this slide-action type of gun, which is typified by the Colt Model 1911A-A1 pistol.

[0002] The Model 1911A-A1 has a barrel-centering protuberance around the outer surface of a longitudinally mounted barrel, the muzzle of which extends through a barrel-alignment channel in a slide. The barrel-centering protuberance must be precisely fitted within the alignment channel. The gun is structured such that the slide and barrel move: (1) When a projectile is loaded from the magazine into a fixed position, (2) when the trigger is pulled, and (3) when the projectile is discharged. In order to make the slide and barrel move smoothly relative to each other, some degree of play must exist at the site of engagement between the barrel-centering protuberance on the barrel and the alignment channels in the slide. This play is necessary to deal with the heat expansion, longitudinal and upward movement, accumulation of contaminants, and so forth, that occur between the slide, barrel,and gun body. The major drawback of the necessity of this play is the friction that occurs unevenly and at high levels between parts while they move, which leads to various problems, such as uneven wear, stress, and noise. Additionally, the wear on parts creates fine particles that lead to the further deterioration of the action of the key movable parts and the airtightness of the propellant release valve.

[0003] U.S. Pat. No. 5,654,519 (Albrecht) proposes a method that goes some way towards reducing the aforementioned problems for the interaction of barrel and slide in slide-action automatic pistols. Albrecht proposes an elastic and resilient barrel-centering protuberance installed in a groove—preferably in the form of a flexible steel ring—around the outer surface of the barrel, the muzzle of which extends through a barrel-alignment channel in the slide.

[0004] However, the Albrecht invention, like its predecessors, employs non-rotating guidance means which, due to the constant contact between the unmovable surface of guidance parts and the guided movable gun parts, make it difficult for the system to reduce the aforementioned friction in order to ensure the smooth operation of slide-action guns. Albrecht, moreover, does not apply to other types of guns with similar slidably engageable subassemblies.

BRIEF SUMMARY OF THE INVENTION

[0005] What follows is an explanation of the improved means by which the present invention solves the above-mentioned problems associated with slide-action guns and other firearms with similarly functioning, slidably engaged parts. Preferably, at least a set guide members in the form of micro-rollers and a pair of guide channels are installed on a gun such as to be parallel and complimentarily engaged on the inner sides of a slide and on the upper outer sides of a gun frame, or on the lower face of a slide-housed slidable barrel and on the upper face of a gun frame.

[0006] The present invention relates to firearms which, like slide-action pistols, require the smooth, low-friction operation of various movable subassemblies of a gun for effecting projectile discharge. One of the primary advantages of the micro-roller system proposed herein is that the surface of the micro-rollers do not at any one point constantly touch the slidable gun part(s) involved in projectile discharge with which they are in contact. Hence, when the micro-roller sliding system is installed in a gun, the sliding and rotating surfaces mutually engaged in the process of projectile discharge do not experience the aforementioned damaging levels of frictive heat, wear, or warping, as well as jamming. With extensive use, waste material may collect on the guide rollers, obstructing roller rotation. In such a case, the guide rollers can be easily removed and replaced.

[0007] The present invention has a broad and flexible application. For example, the slidable unit can comprise a slide or a barrel of a pistol; a breech cylinder or a breech piston of an automatic or semi-automatic machine gun; a receiver or a bolt of an automatic rifle; or, a bolt of a bolt action rifle. In the case of an automatic or semi-automatic machine gun with a rack gear, such as that discussed in more detail below, guide rollers are preferably directly installed partially or fully into the inner surface of a breech cylinder (slidable unit) in order to guide a breech piston (slidable unit). Although the function of the parts differs from those in the machine gun described herein, it is even possible to install the micro-rollers in the cylinder of an automatic slide-action pistol to guide the piston it houses (FIG. 1). In the case of an automatic rifle, it is preferred that guide micro-rollers are installed on a receiver for the purpose of guiding a bolt (slidable unit). For bolt action rifles, it is preferred that guide rollers are installed on a frame for the purpose of guiding a bolt (slidable unit).

[0008] The guide members (micro-rollers) can comprise easily removable rotational guide rollers with roller axes, or fixed guide protuberances. It is also possible to utilize roller bearings within the guide rollers, and to construct the guide rollers to be extremely small, even to the extent that micro- or nano-technology must be used to engineer them. The guide members can be attached to, or otherwise form a part of, guide rails. In addition, the guide members, or the guide members as a part of the guide rails, can rest in guide channels installed in parallel sets on or in the frame or slidable unit. Furthermore, the guide members by themselves or as a part of guide rails, can be longitudinally arranged in unlimited multiple opposing pairs on the frame or the slidable unit of the gun body.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

[0009] FIG. 1 is a cross-sectional view of the various components of a toy air gun for the purpose of describing a number of the preferred embodiments of the present invention.

[0010] FIG. 2 is a cross-sectional view of the slide of Embodiment No. 1, illustrating the guide rollers thereof.

[0011] FIG. 3 is a lateral view sequentially illustrating the motion of the slide shown in FIG. 1.

[0012] FIG. 4 is a front cross-sectional view of the slide of Embodiment No. 1, and a partial front cross-sectional view of the frame of Embodiment No. 1, illustrating the guide rollers, guide channels, and roller axes thereof.

[0013] FIG. 5 is an oblique view of the gun of Embodiment No. 2, including a separated view of the slide and a sectional view of the frame, illustrating the upper part of the frame on which the guide roller and roller axes of Embodiment No. 2 are located.

[0014] FIG. 6 is a view of the frame and slide of Embodiment No. 2, including a top sectional view illustrating the guide rails on the face of the frame, and a plan view outlining the guide channels in the underside of the barrel within the slide.

[0015] FIG. 7 is a top sectional view of the slide of Embodiment No. 3, illustrating the guide rollers on the underside of the barrel within the slide and showing the outline of the guide channels on the upper face of the frame.

[0016] FIG. 8 is a partial front cross-sectional view of the slide, barrel, and frame of Embodiment No. 3, illustrating the guide channels, guide rollers, and roller axes on the lower face of the barrel within the slide, and the guide rails and inner channels on the upper face of the frame thereof.

[0017] FIG. 9 is an oblique view of the of the guide rails of Embodiment No. 4, illustrating the guide protuberances thereof.

[0018] FIG. 10 is an oblique view of the guide rails of Embodiment No. 5, illustrating the guide members thereof.

[0019] FIG. 11 is an oblique view of the guide rails of Embodiment No. 6, illustrating the guide members thereof.

[0020] FIG. 12 is a cross-sectional view of the relevant components of a toy semi-automatic machine gun, for the purpose of illustrating Embodiment No. 7 of the present invention.

[0021] FIG. 13 is a cross-sectional view illustrating the cylinder, piston, and micro-rollers of Embodiment No. 7.

[0022] The parts listed below are correlated by number and name throughout FIGS. 1-13.

[0023] D Radius

[0024] 1 Gun frame

[0025] 2 Grip

[0026] 3 Projectile

[0027] 4 Projectile loading chamber

[0028] 5 Gas chamber

[0029] 6 Magazine

[0030] 7 Spring

[0031] 8 Gas release valve

[0032] 9 Gas passage

[0033] 10 Elastic nozzle

[0034] 11 Barrel

[0035] 12 Inner barrel

[0036] 13 Projectile holding chamber

[0037] 14 Slide

[0038] 15 Cylinder

[0039] 16 Return spring

[0040] 17 Trigger

[0041] 18 Hammer

[0042] 19 Gas valve knob

[0043] 20 Piston

[0044] 27 Interlinking protuberance

[0045] 28 Spring

[0046] 30 Guide rail

[0047] 30a Guide member

[0048] 30b Inner guide channel

[0049] 31 Guide roller

[0050] 32 Guide channel

[0051] 33 Guide protuberance

[0052] 34 Roller axis

[0053] 110 Piston cylinder apparatus

[0054] 111 Barrel

[0055] 112 Cylinder

[0056] 113 Nozzle

[0057] 114 Piston

[0058] 115 Spring

[0059] 116 Projectile

[0060] 117 Loading chamber

[0061] 118 Cylinder push spring

[0062] 119a Spring post

[0063] 119b Component

[0064] 120 Gear mechanism

[0065] 121 Rack

[0066] 124 Pinion

[0067] 127 Cogless portion

[0068] 128 Gear group

[0069] 129 Motor

[0070] 130 Trigger

[0071] 131 Switch

[0072] 132 Interlocking components

[0073] 133 Micro-roller

[0074] 134 Rotational axis

DETAILED DESCRIPTION OF THE INVENTION

[0075] What follows is a detailed description of the composition and operation of various embodiments of the roller sliding system of the present invention in reference to the drawings.

[0076] FIG. 1 is a cross-sectional view of the normal loaded state of a toy air gun for the purpose of describing the several preferred embodiments of the present invention. FIG. 2 is a cross-sectional view of the slide of Embodiment No. 1 of the present invention. FIG. 3 is a lateral view showing the sequential motion of the slide of FIG. 1. FIG. 4 is a front cross-sectional view of the slide, and a partial front cross-sectional view of the frame, of Embodiment No. 1 of the present invention. FIG. 5 is an oblique, separated view of Embodiment No. 2 of the present invention. FIG. 6 is a top sectional view of the frame, and a plan view of the underside of the slide, of Embodiment No. 2 of the present invention. FIG. 7 is a top sectional view of the underside of the slide of Embodiment No. 3 of the present invention. FIG. 8 is a partial cross-sectional view of the slide, barrel, and frame of Embodiment No. 3 of the present invention. FIG. 9 is an oblique view of the guide rails of Embodiment No. 4 of the present invention. FIG. 10 is an oblique view of the guide rails in Embodiment No. 5 of the present invention. FIG. 11 is an oblique view of the guide rails in Embodiment No. 6 of the present invention. FIG. 12 is a cross-sectional view of the relevant components of a toy semi-automatic machine gun, illustrating Embodiment No. 7 of the present invention. FIG. 13 is a cross-sectional view illustrating the cylinder and piston of Embodiment No. 7.

[0077] What follows is an explanation of the overall structure of the toy slide-action automatic pistol in FIG. 1. Referring to FIG. 1, a grip 2 of a gun frame 1 contains a removable magazine 6, within which is fitted a projectile loading chamber 4 for housing a number of projectile 3 (plastic BBs), and a gas chamber 5 for storing pressurized gas. Pressurized air, or pressurized gas such as Freon, nitrogen, or carbon dioxide gas, can be used as a propellant in the illustrated type of pistol; in the case of FIG. 1, gas chamber 5 is filled with liquid gas. In loading chamber 4, projectile(s) 3 is pushed upward with a spring 7. Furthermore, an elastic nozzle 10 is fitted in the upper part of gas chamber 5 and forms a gas release valve 8 and a gas passage 9. In its normal state, gas passage 9 is shut off by gas release valve 8. An inner barrel 12 is fixed within a barrel 11 and acts as the passage for a discharged projectile 3. A projectile holding chamber 13 is an elastic, cylindrical rubber chamber at the muzzle-end of barrel 11. The inner diameter of holding chamber 13 is some degree smaller than the outer diameter of projectile 3, such that projectile 3 is held in holding chamber 13 based on mutual counterforce. In addition, the inner surface of holding chamber 13 manifests protuberances which have a relatively smaller inner diameter than holding chamber 13 and serve to further secure projectile 3. A slide 14 is a slidable unit involved in projectile discharge which is installed so as to cover but not directly make contact with barrel 11, also a slidable unit involved in projectile discharge, within which is fixed an inner barrel 12, at the rear of which are a piston 20 and a cylinder 15, both of which are also slidable units involved in projectile discharge. Inner barrel 12 slidably holds cylinder 15. A return spring 16 is fitted between slide 14 and gun frame 1, and serves to pull slide 14 back to its original position after slide 14 has moved rearward.

[0078] Also, gun frame 1 is furnished with a trigger 17 at the front of grip 2, and a hammer 18, which is linked to a trigger 17 and is placed at the back of gun frame 1. When trigger 17 is pulled, a sear that holds in place hammer 18 moves, releasing hammer 18, which rotates under the force of a compressed spring and strikes an impact plate; this impact plate pushes against the coil-force of a gas valve knob 19 (of a gas release valve 8), causing gas passage 9 to open, gas to be emitted, and projectile 3 to be discharged from the gun muzzle.

[0079] In the inner rear part of slide 14, and to the rear of inner barrel 12, are fitted piston 20 and cylinder 15, which are mounted so as to be slidable relative to one another. At the upper portion of cylinder 15 is positioned an interacting protuberance 27, which interacts with slide 14 such that interacting protuberance 27 moves when slide 14 moves rearward. A spring 28 is installed between interacting protuberance 27 and slide 14.

[0080] In Embodiment No. 1 of the present invention, as illustrated in FIG. 2, guide rollers 31 are mounted longitudinally in the inner left and right sides of slide 14 to guide slide 14, which, as illustrated in FIG. 3, can move in an alternating longitudinal direction on gun frame 1. Furthermore, as shown in FIG. 4, guide channels 32 are made in the outer left and right upper sides of gun frame 1 such that guide rollers 31 are directly slidably engaged with guide channels 32., where they on roller axes 34. Each guide roller 31 has a centering roller axis 34 on which it rotates freelyy. In Embodiment No. 1, roller axis 34 takes the form of a metallic guide post embedded perpendicularly into the lower inner surface of slide 14 such as to extend perpendicularly into guide roller 31 from slide 14.

[0081] In addition, guide rollers 31 can be mounted at any point along the inner left and right sides of slide 14. It is further possible, for the purpose of stably guiding the relative movements of the barrel and the slide, to directly mount on barrel 11 or slide 14 similar micro-rollers at points along the gap between the outer surface of barrel 11 and the inner surface of slide 14 so as to stably guide both parts. Also, guide roller 31 is constructed to be removable. With extensive use, waste material may collect on guide roller 31, obstructing roller rotation. In such cases, guide roller 31 can be removed and replaced with a new one. The efficiency of guide roller 31 can be increased by utilizing roller bearings within it.

[0082] In Embodiment No. 2 of the present invention, as illustrated in FIG. 5, guide rollers 31 are mounted at two parallel points on the front end and two parallel points on the back end of guide rails 30, which are mounted on gun frame 1. Slide 14, then, is secured and stabilized at these four longitudinal, left and right points. Guide channels 32, which are engaged with guide rails 30 via guide rollers 31, are furnished longitudinally and parallel on the inner left and right sides of slide 14, as shown in FIG. 5 and FIG. 6. Thus, the guide rollers 31 on guide rails 30, in interaction with guide channels 32, serve to guide slide 14, which, as illustrated in FIG. 3, can move longitudinally on gun frame 1. However, it is also possible to make the guide channels on the lower face of barrel 1, which is housed within slide 14; or, to make guide channel 32 out of recesses made on both barrel 1 and slide 14.

[0083] In Embodiment No. 2, to mount guide rollers 31, a portion of guide rail 30 is machined into a cylindrical shape which thrusts upwardly as a centering roller axis 34, which takes the material form of a guide post perpendicular to frame 1. Guide roller 31 is set so as to rotate on roller axis 34. The outer edge of guide roller 31 is configured to protrude more than the outer-edge surface of guide rail 30, and to abut the inner surface of guide channel 32, which is formed on the inner surface (plan view) of slide 14.

[0084] In Embodiment No. 2, referring to FIG. 1, FIG. 5 and FIG. 6, slide 14 slides on guide rollers 31 of guide rails 30 when projectile 3 is readied for firing, and when trigger 17 is pulled, projectile 3 is discharged and the next projectile 3 is positioned in projectile holding chamber 4. Thus, guide channels 32 have points of contact with, or are in a consistent line of contact with, guide rollers 31. The remaining, non-contact area, that is, the gap between guide rails 30 and slide 14, can be made large or small.

[0085] Referring to FIG. 7 and FIG. 8, Embodiment No. 3 illustrates a means by which to mount guide rollers 31 (and guide rails 30) on barrel 11 instead of on gun frame 1 or on slide 14. In this case, guide rails 30 are machined longitudinally and parallel into the left and right sides of the upper surface of gun frame 1, but guide rollers 31 are not mounted on guide rails 30; rather, guide rollers 31 are supported and centered by axes 34 made in the form of guide posts which are installed supsended in left-right pairs downward from the underside of the surface of barrel 11, which is slidably housed within slide 14. The lower, lateral inner surfaces of slide 14, and inner channels 30b on the lower, outer lateral surfaces of guide rails 30, form guide channels 32 which engage guide rollers 31. Also, the lower surface of barrel 11 is somewhat cut away in order to provide clearance space for guide rails 30 as well as the posts of guide axes 34. As shown in FIG. 8, guide rollers 31 are installed so as touch inner guide channels 30b. In this case, as well, the number and positioning of guide rollers 31 is not limited to the illustrated embodiment.

[0086] Next, in Embodiment Nos. 4-6, several types of guide members which can be mounted on the above-mentioned guide rails 30 are discussed. Referring to FIG. 9, in Embodiment No. 4, in place of guide rollers 31, the guide rail components employed are fixed concave slide guide components. Namely, slide guide components made of plates of curved metal (or other substance) are secured to the outer sides of guide rails 30. The radius of a curved guide protuberance 33 is designed to be slightly larger than the gap between guide rail 30 and guide channel 32. Guide protuberance 33 have points of contact or a constant line of contact with guide channels 32 and is guided on the inner surface of guide channels 32. In the case of a slide guide component with this type of configuration, it is possible for guide protuberance 33 to change its shape in order to correspond to any changes in the gap between guide rail 30 and guide channel 32, thus allowing for stable guidance and the prevention of instability. It is preferred that such a guide protuberance be made out a low-friction, slippery plastic or metal alloy.

[0087] Next, Embodiment No. 5 is discussed using FIG. 10. In Embodiment No. 5, space is made in guide rail 30 for a guide member(s) 30a in the form of a guide roller, cylindrical protuberance, or steel sphere, etc., a part of which is designed to protrude from the lateral surface of guide rail 30. A guide member 30a is configured so that it is in contact with guide channel 32. The number of guide members 30a to be furnished on guide rails 30 is not limited by the present illustration; a large or small number of guide members 30a can offer stable guidance.

[0088] Embodiment No. 5 illustrates the design of a guide member 30a for guiding the lateral surface of a guide rail 30, while Embodiment No. 6 shows, with reference to FIG. 11, guide member 30a in the form of either a guide protuberance or a guide roller which can be furnished on both the lateral and the upper surfaces of a guide rail 30, making it even more possible to assure stable vertical and horizontal positioning and guidance during projectile discharge parts' sliding actions.

[0089] In regards to Embodiment Nos. 1-6, it is not necessary to limit the positioning of guide rollers 31, guide protuberances 33, or guide members 30a to certain mounting positions or to a given number of points. It is possible to mount a pair of guide rollers 31 on both left and right guide rails 30, and to mount such a left-right pair of guide rollers 31 longitudinally and in multiple pairs along guide rails 30. Furthermore, instead of mounting pairs of guide rollers 31 on both left and right guide rails 30, it is possible, as illustrated by FIG. 10 and FIG. 11, to install elastic, slippery guide members 30a in the form of protuberances or rollers on both the left and right as well as on the upper surface of guide rails 30, with no guide posts extending perpendicularly into such guide members. Moveover, slide 14 can be stably guided by mounting multiple guide rollers in longitudinal guide positions, and even over six of such guide rollers or guide members can be mounted, with or without guide rails. In fact, concerning the guide components of Embodiment Nos. 2, 3, 5, slide 14 can be stably guided by longitudinally mounting as many guide rollers 31 or guide members 30a as possible on both the left and right guide rails 30. Also, in all of the relevant aforementioned cases, the guide roller units can be extremely small, even to the extent that nanotechnology can be used to engineer them. Preferably, guide rollers 31 are at least mounted on the front and back inner surface of the parallel sides of slide 14, on the upper front and back face of gun frame 1, or on the lower front and back face of barrel 11.

[0090] The technical scope of the present invention is not limited to toy guns; it applies to all small firearms which feature movable subassemblies involved in projectile discharge, such as an automatic pistol's slide and barrel, a machine gun's breech cylinder and piston, a bolt-action rifle's receiver and bolt, or other interactive slidable units. To further illustrate the versatility of the application of the present invention, the following embodiment provides an example of the present invention applied to a toy semi-automatic machine gun which employs a rack gear.

[0091] Referring to FIG. 12, piston-cylinder apparatus 110 is furnished at the rear (opposite the muzzle-end) of a barrel 111. It is possible for pressurized air to be emitted towards barrel 111 from a nozzle 113 located at the forward end of a cylinder 112. A piston 114 is installed within cylinder 112 to be slidable in a longitudinal, forward and rearward direction. The pressure of a spring 115 on piston 114 is in a direction which generates compressed air in cylinder 112. Cylinder 112 itself, which is pushed by a cylinder push spring 118, is mounted to be longitudinally slidabe, which permits a projectile 116 to enter a loading chamber 117. Therefore, both piston 114 and cylinder 112are slidable units involved in projectile discharge

[0092] Spring 115, secured on the rearward end of a spring post 119a, governs the compressing action of piston 114, which receives and supports the forward end of spring 115. Piston 114 features a component 119b, which faces in a forward direction from the rearward end of piston 114 where a rack 121 is furnished as part of a gear mechanism 120. A pinion 124, which is another element of gear mechanism 120, is positioned to engage with rack 121. The driving force of a motor 129 is transmitted via a gear group 128 to pinion 124. In order for the gear pressure of gear mechanism 120 to be properly recieved, pinion 124, without axial deflection, and rack 121, without curving, are both designed to advance in a straight line.

[0093] When a trigger 130 is pulled, a switch 131 is activated and motor 129 begins to rotate, after which pinion 124 and rack 121 are in a state of engagement and are able to rotate. Furthermore, when pinion 124 rotates and advances to a cogless portion 127, piston 114 rapidly moves forward under the projecting pressure of spring 115, compressing the air cylinder 112. The compressed air thus produced is emitted from nozzle 113, discharging projectile 116 if one is present in loading chamber 117. After this process of projectile discharge, cylinder 112 is temporarily brought back due to the interlinking of cylinder 112 with interlocking components 132, which consist of a cam, etc., installed on gear group 128. Also, a single projectile 116 in the loading channel is loaded into loading chamber 117 by pushing spring 118.

[0094] In the case of this type of gun, as illustrated in FIG. 13, the installation of numerous micro-rollers 133 in the area of the gap between piston 114 and cylinder 112 in the gun frame enable the smooth sliding and precise alignment of piston 114. The rotational axis 134 of roller(s) 133 is fixed on the inner circumference of cylinder 112 such that the outer surface of roller(s) 133 is in contact with the outer surface of piston 114 within cylinder 112. In Embodiment No. 7, micro-rollers 133 are installed at 120 degree intervals on cylinder 112. However, even more micro-rollers 133 can be installed, and neither the number nor the positioning of micro-rollers 133 is limited by the description of the preferred embodiment described herein.

[0095] The preferred embodiments of the present invention have been described above. The drawings presented herein are intended to illustrate the preferred embodiments of the invention but they should not be considered a limitation of the present invention. Therefore, modifications, adaptations, or other changes concerning the illustrated art may fall within the spirit and scope of the present invention.