US20090013984A1 - Marker mechanism - Google Patents
Marker mechanism Download PDFInfo
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- US20090013984A1 US20090013984A1 US12/141,254 US14125408A US2009013984A1 US 20090013984 A1 US20090013984 A1 US 20090013984A1 US 14125408 A US14125408 A US 14125408A US 2009013984 A1 US2009013984 A1 US 2009013984A1
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- United States
- Prior art keywords
- bolt
- longitudinally
- extending section
- marker
- external diameter
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
- F41B11/00—Compressed-gas guns, e.g. air guns; Steam guns
- F41B11/70—Details not provided for in F41B11/50 or F41B11/60
- F41B11/72—Valves; Arrangement of valves
- F41B11/721—Valves; Arrangement of valves for controlling gas pressure for both firing the projectile and for loading or feeding
Definitions
- This invention relates to an improved mechanism for a gas operated marker, i.e., a marker which fires a (paint-filled) projectile by means of compressed gas.
- Markers of this kind can be used in forestry for marking trees and are also used in paintball games in which balls of paint are fired at other players to mark them.
- U.S. Pat. No. 5,613,493 seeks to address this problem by attaching a spool valve to the rear of the bolt.
- a fill chamber and a dump chamber are positioned in the marker housing behind the bolt. In the rear position of the bolt both chambers are filled with compressed gas, but when the bolt moves forward the spool valve isolates the chambers so that only the gas stored in the dump chamber escapes through the hollow bolt to fire the selected paint ball.
- a drawback of this marker is its complexity, the additional length of the marker required to house the spool valve, the weight and inertia of the spool valve and relatively high manufacturing and maintenance costs.
- An object of the present invention is to provide an efficient, compact marker.
- a mechanism for a gas operated marker having a housing and a trigger
- the mechanism comprising a hollow bolt slideably mounted on a bolt guide fixed relative to the marker housing, the bolt being adapted to move to a forward position on the bolt guide when the trigger of the marker is pulled to fire a paint ball and then to return to a rear position on the bolt guide after the ball has been expelled from the barrel.
- the bolt has a first circumferential face which is exposable to gas at a first pressure which produces a rearward force on the bolt and a second circumferential face which is exposable to gas at a second pressure which produces a forward force on the bolt.
- the gas at the first pressure can be provided in an annular chamber surrounding the bolt and at least some of the gas at the second pressure can be stored in a cylindrical chamber occupying the interior of the bolt guide.
- the cylindrical chamber can communicate with the second circumferential face on the bolt via at least one longitudinally extending port formed in the bolt guide wall. Sealing means such as, not limited to, O-rings in circumferential slots formed in the bolt and bolt guide are arranged to isolate the cylindrical chamber from the interior of the barrel of the marker when the bolt is in the rear position.
- the projected area of the first face in the longitudinal direction of the bolt and the first pressure, and the projected area of the second face in the longitudinal direction of the bolt and the second pressure are chosen so that when the annular chamber is charged with gas at the first pressure and the cylindrical chamber is charged with gas at the second pressure then the rearward force on the bolt is greater than the forward force on the bolt. This holds the bolt in the rear position. Forward movement of the bolt during firing is achieved by reducing the first pressure, preferably by venting the annular chamber though a multipath valve to ambient pressure. As first pressure drops the rearward force on the bolt falls below the forward force on the bolt and the bolt is driven forward.
- This forward motion (also called “advancement”) of the bolt opens up a passageway between the cylindrical chamber, the at least one longitudinally extending port, the interior of the bolt and the interior of the barrel, allowing the compresses gas in the cylindrical chamber to vent out through the barrel.
- Rearward movement (also called “retraction”) of the bolt after firing is preferably achieved by operating a valve, preferably a multipath valve, to re-establish the first pressure in the annular chamber.
- a supply of gas at the first pressure is connected via a filling valve to a second annular chamber which is in communication with the cylindrical chamber via the at least one port in order to refill the cylindrical chamber with compressed gas.
- the supply of gas at the first pressure is connected by a valve, preferably, if used, the multipath valve for re-establishing the first pressure in the annular chamber, to the first annular chamber where it acts on the first circumferential face on the bolt, causing the bolt to move backwards.
- FIG. 1 shows an example of an embodiment of a marker in accordance with the present invention
- FIG. 2 a illustrates schematically in section part of the mechanism of the marker of FIG. 1 showing the bolt in its rearward position
- FIG. 2 b illustrates schematically in section part of the mechanism of the marker of FIG. 1 showing the bolt in its forward position
- FIGS. 3 a - 3 e show schematically exploded views in section of three embodiments of bolts, enlarged views of portions thereof, and other marker components, in accordance with the present invention
- FIGS. 4 a and 4 b show enlarged views corresponding to FIGS. 2 a and 2 b of the first embodiment of a bolt in accordance with the present invention
- FIG. 5 a shows schematically a section through a second embodiment of a bolt in accordance with the present invention in the forward position
- FIG. 5 b shows a partial enlargement of the bolt of FIG. 5 a
- FIG. 6 a shows schematically a section through a third embodiment of a bolt in accordance with the present invention in the forward position
- FIG. 6 b shows a partial enlargement of the bolt of FIG. 6 a.
- FIGS. 1 , 2 a , 2 b , 3 a , 4 a and 4 b show schematically an example of a marker 1 provided with a first embodiment of a bolt in accordance with the present invention.
- Marker 1 has a hollow, tubular bolt 101 which is slideable on a bolt guide 117 fixed cantilever fashion to the rear of the marker housing 2 by its head 3 .
- a mechanism 5 Surrounding the bolt and bolt guide is a mechanism 5 which serves to move the bolt 101 forward when the trigger 7 of the marker is pulled and rearward when the trigger 7 is released.
- Mechanism 5 comprises a valve 9 , preferably a multipath valve, which is operated by a pull on trigger 7 to selectively place in communication a supply of compressed gas for example in a canister 11 attached to the marker 1 with an annular chamber 22 a encircling said bolt 101 and an internal chamber 133 inside said bolt guide 117 .
- Valve 9 can be operated in any way, for example mechanically, electronically, pneumatically or hydraulically.
- Bolt 101 is provided with a first external circumferential face 110 with a projected surface area A 1 normal to the longitudinal axis of the marker and a second external face 112 with a projected surface area A 2 normal to the longitudinal axis of the marker (see enlarged views in FIGS. 3 d and 3 e ).
- Forward driving and rearward driving of the bolt can be controlled by adjusting the pressure of the compressed gas acting on each these faces. Rearward driving being achieved when the product of the surface area A 1 and the pressure acting on it is greater than the product of the surface area A 2 and the pressure acting on it, and forward driving being achieved when the opposite relationship occurs.
- bolt 101 comprises a hollow stepped body 103 with a first, forward, bolt end 105 and a second, rearward, bolt end 107 separated by a tubular bolt wall 109 of length BL.
- Tubular bolt wall 109 comprises:
- first longitudinally-extending section 111 of external diameter BD 1 and internal diameter Bd 1 , which extends from said first bolt end 105 a distance BL 1 towards said second end 107 ;
- second longitudinally-extending section 113 of external diameter BD 2 and internal diameter Bd 2 , which extends from said first longitudinally-extending section 111 a distance BL 2 towards said second bolt end 107 ; wherein external diameter BD 2 is greater than internal diameter Bd 2 which is greater than external diameter BD 1 .
- Bolt guide 117 comprises a stepped body 119 with a first end 121 and a second end 123 separated by a wall 125 of length GL,
- Body 119 comprises:
- the sum of GL 1 plus GL 2 is less than or equal to BL in order to prevent the first end 121 of body 119 from projecting though the bolt 101 when the bolt 101 is in the rearmost position.
- Bolt housing 6 has a stepped inner profile 8 —the distal end 10 of which has an internal circular rib 12 of width Hl 1 in the longitudinal direction and an opening of diameter Hd 1 which is equal to or greater than BD 1 and less than BD 2 —thus allowing the first longitudinally-extending section 111 of bolt 101 to pass though it but preventing the second longitudinally-extending section 113 of bolt 101 from passing though it.
- the longitudinal section 13 of bolt housing 6 which extends from the rearward facing face of rib 12 towards proximal end 14 has internal diameters Hd 2 which are equal to or greater than BD 2 .
- the outer surface 16 of bolt housing 6 is provided with at least two (but in this embodiment three) longitudinally spaced circumferential ribs 18 a , 18 b and 18 c which seal against the inner surface 20 of marker housing 2 .
- a first annular space 22 a is formed between first rib 18 a and second rib 18 b when bolt housing is mounted in marker housing 2 . In the event that only two longitudinally spaced circumferential ribs are used then these must be the ribs 18 a , 18 b which form first annular space 22 a .
- This annular space 22 a is connectable via a port 24 a in marker housing 2 to valve 9 and compressed gas supply 11 .
- At least one through hole 26 a in the wall of bolt housing 6 leads from annular space 22 a to a variable length annular chamber 28 a which is formed between the inner surface of bolt housing and the external surface of diameter BD 1 of bolt 101 and which extends longitudinally from face 110 to the side of rib 12 facing face 110 .
- the length of chamber 28 a is at a maximum when bolt 101 is in the rearmost position, as shown in FIGS. 2 a and 4 a and is at a minimum when bolt 101 has been fired and is in the forward position as shown in FIGS. 2 b and 4 b .
- the difference in length of annular chamber 28 a between these two positions is the stroke S of the bolt.
- a second annular space 22 b is formed between second rib 18 b and third rib 18 c when bolt housing is mounted in marker housing 2 .
- This annular space 22 b is connectable via a port 24 b in marker housing 2 to compressed gas supply 11 .
- At least one through hole 26 b in the wall of bolt housing 6 leads from annular space 22 b to the interior of bolt housing 6 .
- bolt housing 6 , bolt guide 117 and bolt 101 are arranged so that the forward longitudinal movement of bolt 101 is stopped when face 110 (or optionally a resilient buffer 151 provided on face 110 ) comes into contact with rib 12 and the rearward longitudinal movement of bolt 101 is stopped when face 112 comes into non-sealing contact with the first portion of bolt guide 117 which has a diameter greater than Bd 2 .
- compressed gas can pass from compressed air supply 11 , port 24 b , annular space 22 b , the non-sealing contact between face 112 and the first portion of bolt guide 117 which has a diameter greater than Bd 2 and at least one longitudinally extending port 135 to longitudinally-extending internal gas storage chamber 133 .
- compressed gas can pass from compressed gas supply 11 via valve 9 , port 24 a , and through hole 26 b in the wall of bolt housing 6 into annular space 22 a where it exerts a rearward force on face 110 which is greater than the forward force on face 112 thus holding the bolt in the rearward position.
- Sealing means 161 a such as an O-ring, X-ring, V-ring, resilient washer or equivalent, in a circumferential groove is arranged between the exterior of bolt 101 and the interior of bolt housing 6
- sealing means 161 b such as an O-ring, X-ring, V-ring, resilient washer or equivalent, is arranged between the exterior of bolt guide 117 of diameter GD 2 and the interior of bolt 101 of diameter Bd 2
- sealing means 161 c such as an O-ring, X-ring, V-ring, resilient washer or equivalent, is arranged between the interior of housing 6 of diameter Hd 1 and the exterior of bolt 101 of diameter BD 1 so that in this position the compressed gas can exert a forward force on face 112 but cannot escape from the longitudinally-extending internal gas storage chamber 133 , and the gas exerting a rearward force on face 110 cannot escape from between the exterior of bolt 101 and the interior of bolt housing 6 .
- the surfaces of faces can have any shape such as flat or sloping.
- valve 9 when trigger 7 is pulled to fire the marker, valve 9 is actuated so that compressed air is vented from variable length annular chamber 28 a and bolt 101 moves forward as the forward force exerted on face 112 overcomes the force exerted on face 110 which diminishes as the compressed air is vented from annular chamber 28 a .
- the proximal end of bolt 101 is provided with an internal, longitudinally extending portion of internal diameter Bd 2 which seals against sealing means 161 b .
- the portion of internal diameter Bd 2 extends towards the distal end so that when bolt 101 is in the rearward position the portion of bolt of internal diameter Bd 2 is sealed by sealing means 161 b against bolt guide 116 but as soon as bolt moves forward then this portion of internal diameter Bd 2 starts to move away sealing means 161 b thereby opening a gap between sealing means 161 b and the portion of internal diameter Bd 2 which allows compressed gas from internal gas storage chamber 133 via longitudinally extending port 135 to pass the sealing means 161 b and exit into the breech and barrel, thereby propelling the paintball out of the barrel.
- Bolt 101 travels forward until it is arrested by rib 12 .
- valve 9 is activated to allow compressed gas from supply 111 to enter variable length annular chamber 28 a and push bolt 101 rearwards.
- compressed gas refills longitudinally-extending internal gas storage chamber 133 via valve 9 , port 24 b , annular space 22 b , longitudinally extending port 135 and after longitudinally extending port 135 is obscured by bolt 101 , the non-sealing contact between face 112 and the first portion of bolt guide 117 which has a diameter greater than Bd 2 .
- Refilling of compressed gas stops when the pressure in longitudinally-extending internal gas storage chamber 133 is the same as that in supply 11 .
- FIGS. 3 b , 3 c and 5 a - 6 b show further embodiments of bolts in accordance with the present invention.
- Bolt 101 b shown in FIGS. 3 b , 5 a , 5 b has a third longitudinally-extending section 115 b of external diameter BD 3 which extends from said second longitudinally-extending section 113 a distance BL 3 towards said second bolt end 5 , wherein external diameter BD 3 is greater than external diameter BD 2 .
- Third longitudinally extending section 115 b is provided with two longitudinally spaced circumferential sealing means, such as O-rings, X-rings, V-rings, resilient washers or equivalents 118 a , 118 b which are intended to seal against the inner surface of bolt housing 6 on either side of port 24 b , thereby preventing compressed gas from exiting through this port.
- sealing means such as O-rings, X-rings, V-rings, resilient washers or equivalents 118 a , 118 b which are intended to seal against the inner surface of bolt housing 6 on either side of port 24 b , thereby preventing compressed gas from exiting through this port.
- Bolt 101 c shown in FIGS. 3 c , 6 a and 6 b has a third longitudinally-extending section 115 c of external diameter BD 3 which extends from said second longitudinally-extending section 113 a distance BL 3 towards said second bolt end 5 , wherein external diameter BD 3 is greater than external diameter BD 2 .
- This forms a face 114 c of area A 3 between said second and third longitudinally extending sections 113 respectively 115 c .
- Third longitudinally extending section 115 c is provided with a single circumferential sealing means, such as an O-ring 118 c which are intended to seal against the inner surface of bolt housing 6 to the rear of port 24 b , thereby allowing compressed gas exiting through this port to exert a rearward force on face 114 c.
- a single circumferential sealing means such as an O-ring 118 c which are intended to seal against the inner surface of bolt housing 6 to the rear of port 24 b , thereby allowing compressed gas exiting through this port to exert a rearward force on face 114 c.
Abstract
A gas powered marker comprises a stepped bolt which is projected forward during firing by compressed gas in a chamber acting on a rearward facing surface of the bolt and which is projected backwards by compressed gas in a chamber acting on a forward facing surface of the bolt. In the rearmost position the force acting on the forward facing surface is greater than the force on rearward facing surface and firing of the marker is achieved by venting to atmosphere the compressed gas acting on the rearward facing surface.
Description
- This invention relates to an improved mechanism for a gas operated marker, i.e., a marker which fires a (paint-filled) projectile by means of compressed gas. Markers of this kind can be used in forestry for marking trees and are also used in paintball games in which balls of paint are fired at other players to mark them.
- Many conventional markers have a hollow bolt which, when the trigger is pulled to fire the marker, is driven by compressed gas from a rearward position to a forward position in the breech. As the bolt moves forward it pushes forward a paintball which has been loaded into the breech—usually by gravity from a magazine located above the breech. In the forward position of the bolt bores opening to its interior are exposed to compressed gas in a cylinder surrounding the bolt, causing the paintball and the compressed gas to be expelled from the marker. After this the bolt is moved back to its rear position, in which the bores are isolated from the cylinder and the flow of compressed gas from the cylinder to the breech is stopped. A disadvantage of this otherwise simple arrangement is that more compressed gas is used than is actually necessary to fire the paintball from the barrel. This means that the source of compressed gas—a compressed air storage cylinder connected to the marker housing—has to be refilled frequently, which is both expensive and inconvenient.
- U.S. Pat. No. 5,613,493 seeks to address this problem by attaching a spool valve to the rear of the bolt. A fill chamber and a dump chamber are positioned in the marker housing behind the bolt. In the rear position of the bolt both chambers are filled with compressed gas, but when the bolt moves forward the spool valve isolates the chambers so that only the gas stored in the dump chamber escapes through the hollow bolt to fire the selected paint ball. A drawback of this marker is its complexity, the additional length of the marker required to house the spool valve, the weight and inertia of the spool valve and relatively high manufacturing and maintenance costs.
- An object of the present invention is to provide an efficient, compact marker.
- In accordance with the present invention there is provided a mechanism for a gas operated marker having a housing and a trigger, the mechanism comprising a hollow bolt slideably mounted on a bolt guide fixed relative to the marker housing, the bolt being adapted to move to a forward position on the bolt guide when the trigger of the marker is pulled to fire a paint ball and then to return to a rear position on the bolt guide after the ball has been expelled from the barrel. The bolt has a first circumferential face which is exposable to gas at a first pressure which produces a rearward force on the bolt and a second circumferential face which is exposable to gas at a second pressure which produces a forward force on the bolt.
- In a preferred embodiment of the present invention the gas at the first pressure can be provided in an annular chamber surrounding the bolt and at least some of the gas at the second pressure can be stored in a cylindrical chamber occupying the interior of the bolt guide. The cylindrical chamber can communicate with the second circumferential face on the bolt via at least one longitudinally extending port formed in the bolt guide wall. Sealing means such as, not limited to, O-rings in circumferential slots formed in the bolt and bolt guide are arranged to isolate the cylindrical chamber from the interior of the barrel of the marker when the bolt is in the rear position. The projected area of the first face in the longitudinal direction of the bolt and the first pressure, and the projected area of the second face in the longitudinal direction of the bolt and the second pressure are chosen so that when the annular chamber is charged with gas at the first pressure and the cylindrical chamber is charged with gas at the second pressure then the rearward force on the bolt is greater than the forward force on the bolt. This holds the bolt in the rear position. Forward movement of the bolt during firing is achieved by reducing the first pressure, preferably by venting the annular chamber though a multipath valve to ambient pressure. As first pressure drops the rearward force on the bolt falls below the forward force on the bolt and the bolt is driven forward. This forward motion (also called “advancement”) of the bolt opens up a passageway between the cylindrical chamber, the at least one longitudinally extending port, the interior of the bolt and the interior of the barrel, allowing the compresses gas in the cylindrical chamber to vent out through the barrel. Rearward movement (also called “retraction”) of the bolt after firing is preferably achieved by operating a valve, preferably a multipath valve, to re-establish the first pressure in the annular chamber.
- During rearward movement of the bolt a supply of gas at the first pressure is connected via a filling valve to a second annular chamber which is in communication with the cylindrical chamber via the at least one port in order to refill the cylindrical chamber with compressed gas. The supply of gas at the first pressure is connected by a valve, preferably, if used, the multipath valve for re-establishing the first pressure in the annular chamber, to the first annular chamber where it acts on the first circumferential face on the bolt, causing the bolt to move backwards.
- Several figures are provided to aid in the understanding of the present invention. Corresponding elements in the different have been given the same reference numerals. The scope of the present invention is neither limited to these figures nor to the examples of embodiments described below.
- A preferred embodiment of the invention will now be described by way of non-limitative example with reference to the accompanying drawings, in which:
-
FIG. 1 shows an example of an embodiment of a marker in accordance with the present invention; -
FIG. 2 a illustrates schematically in section part of the mechanism of the marker ofFIG. 1 showing the bolt in its rearward position; -
FIG. 2 b illustrates schematically in section part of the mechanism of the marker ofFIG. 1 showing the bolt in its forward position; -
FIGS. 3 a-3 e show schematically exploded views in section of three embodiments of bolts, enlarged views of portions thereof, and other marker components, in accordance with the present invention; -
FIGS. 4 a and 4 b show enlarged views corresponding toFIGS. 2 a and 2 b of the first embodiment of a bolt in accordance with the present invention; -
FIG. 5 a shows schematically a section through a second embodiment of a bolt in accordance with the present invention in the forward position; -
FIG. 5 b shows a partial enlargement of the bolt ofFIG. 5 a; -
FIG. 6 a shows schematically a section through a third embodiment of a bolt in accordance with the present invention in the forward position; -
FIG. 6 b shows a partial enlargement of the bolt ofFIG. 6 a. -
FIGS. 1 , 2 a, 2 b, 3 a, 4 a and 4 b show schematically an example of a marker 1 provided with a first embodiment of a bolt in accordance with the present invention. Marker 1 has a hollow,tubular bolt 101 which is slideable on abolt guide 117 fixed cantilever fashion to the rear of the marker housing 2 by its head 3. Surrounding the bolt and bolt guide is amechanism 5 which serves to move thebolt 101 forward when thetrigger 7 of the marker is pulled and rearward when thetrigger 7 is released.Mechanism 5 comprises avalve 9, preferably a multipath valve, which is operated by a pull ontrigger 7 to selectively place in communication a supply of compressed gas for example in acanister 11 attached to the marker 1 with anannular chamber 22 a encircling saidbolt 101 and aninternal chamber 133 inside saidbolt guide 117. Valve 9 can be operated in any way, for example mechanically, electronically, pneumatically or hydraulically. -
Bolt 101 is provided with a first externalcircumferential face 110 with a projected surface area A1 normal to the longitudinal axis of the marker and a secondexternal face 112 with a projected surface area A2 normal to the longitudinal axis of the marker (see enlarged views inFIGS. 3 d and 3 e). Forward driving and rearward driving of the bolt can be controlled by adjusting the pressure of the compressed gas acting on each these faces. Rearward driving being achieved when the product of the surface area A1 and the pressure acting on it is greater than the product of the surface area A2 and the pressure acting on it, and forward driving being achieved when the opposite relationship occurs. - As shown in
FIGS. 2 a, 2 b, 3 a, 4 a and 4 b in more detail,bolt 101 comprises a hollowstepped body 103 with a first, forward,bolt end 105 and a second, rearward,bolt end 107 separated by atubular bolt wall 109 of length BL.Tubular bolt wall 109 comprises: - a first longitudinally-extending
section 111, of external diameter BD1 and internal diameter Bd1, which extends from said first bolt end 105 a distance BL1 towards saidsecond end 107;
a second longitudinally-extendingsection 113, of external diameter BD2 and internal diameter Bd2, which extends from said first longitudinally-extending section 111 a distance BL2 towards saidsecond bolt end 107;
wherein external diameter BD2 is greater than internal diameter Bd2 which is greater than external diameter BD1. -
Bolt guide 117 comprises astepped body 119 with afirst end 121 and asecond end 123 separated by awall 125 of length GL, -
Body 119 comprises: - a first longitudinally-extending
section 127 with a maximum external diameter GD1 which extends from said first end 21 a distance GL1 towards saidsecond end 123;
a second longitudinally-extendingsection 129 of maximum external diameter GD2 which extends from said first longitudinally-extending section 127 a distance GL2 towards saidsecond end 123;
a third longitudinally-extendingsection 131 of external diameter GD3 which extends from said second longitudinally-extending section 129 a distance GL3 towards saidsecond end 123; and
a longitudinally-extending internalgas storage chamber 133 which is sealed at both ends but which can communicate with the exterior of the bolt guide via at least one longitudinally extendingport 135 formed in the wall of the second longitudinally-extendingsection 129;
wherein:
GD1 is less than GD2 which is less than GD3; and
GD2 is less than or equal to Bd2 which is less than GD3—this limits the rearward movement ofbolt 101. - Preferably the sum of GL1 plus GL2 is less than or equal to BL in order to prevent the
first end 121 ofbody 119 from projecting though thebolt 101 when thebolt 101 is in the rearmost position. - During
use bolt 101 is prevented from exiting thebarrel 4 of marker 1 by acylindrical bolt housing 6 mounted on the inside of the marker housing 2.Bolt housing 6 has a steppedinner profile 8—thedistal end 10 of which has an internalcircular rib 12 of width Hl1 in the longitudinal direction and an opening of diameter Hd1 which is equal to or greater than BD1 and less than BD2—thus allowing the first longitudinally-extendingsection 111 ofbolt 101 to pass though it but preventing the second longitudinally-extendingsection 113 ofbolt 101 from passing though it. The longitudinal section 13 ofbolt housing 6 which extends from the rearward facing face ofrib 12 towardsproximal end 14 has internal diameters Hd2 which are equal to or greater than BD2. Theouter surface 16 ofbolt housing 6 is provided with at least two (but in this embodiment three) longitudinally spacedcircumferential ribs inner surface 20 of marker housing 2. A firstannular space 22 a is formed betweenfirst rib 18 a andsecond rib 18 b when bolt housing is mounted in marker housing 2. In the event that only two longitudinally spaced circumferential ribs are used then these must be theribs annular space 22 a. Thisannular space 22 a is connectable via aport 24 a in marker housing 2 tovalve 9 andcompressed gas supply 11. At least one throughhole 26 a in the wall ofbolt housing 6 leads fromannular space 22 a to a variable lengthannular chamber 28 a which is formed between the inner surface of bolt housing and the external surface of diameter BD1 ofbolt 101 and which extends longitudinally fromface 110 to the side ofrib 12 facingface 110. The length ofchamber 28 a is at a maximum whenbolt 101 is in the rearmost position, as shown inFIGS. 2 a and 4 a and is at a minimum whenbolt 101 has been fired and is in the forward position as shown inFIGS. 2 b and 4 b. The difference in length ofannular chamber 28 a between these two positions is the stroke S of the bolt. - A second
annular space 22 b is formed betweensecond rib 18 b andthird rib 18 c when bolt housing is mounted in marker housing 2. Thisannular space 22 b is connectable via aport 24 b in marker housing 2 tocompressed gas supply 11. At least one through hole 26 b in the wall ofbolt housing 6 leads fromannular space 22 b to the interior ofbolt housing 6. - The dimensions of
bolt housing 6,bolt guide 117 and bolt 101 are arranged so that the forward longitudinal movement ofbolt 101 is stopped when face 110 (or optionally aresilient buffer 151 provided on face 110) comes into contact withrib 12 and the rearward longitudinal movement ofbolt 101 is stopped whenface 112 comes into non-sealing contact with the first portion ofbolt guide 117 which has a diameter greater than Bd2. - When
bolt 101 is in the rearward position compressed gas can pass fromcompressed air supply 11,port 24 b,annular space 22 b, the non-sealing contact betweenface 112 and the first portion ofbolt guide 117 which has a diameter greater than Bd2 and at least one longitudinally extendingport 135 to longitudinally-extending internalgas storage chamber 133. Additionally compressed gas can pass fromcompressed gas supply 11 viavalve 9,port 24 a, and through hole 26 b in the wall ofbolt housing 6 intoannular space 22 a where it exerts a rearward force onface 110 which is greater than the forward force onface 112 thus holding the bolt in the rearward position. Sealing means 161 a such as an O-ring, X-ring, V-ring, resilient washer or equivalent, in a circumferential groove is arranged between the exterior ofbolt 101 and the interior ofbolt housing 6, and sealing means 161 b such as an O-ring, X-ring, V-ring, resilient washer or equivalent, is arranged between the exterior ofbolt guide 117 of diameter GD2 and the interior ofbolt 101 of diameter Bd2 and sealing means 161 c such as an O-ring, X-ring, V-ring, resilient washer or equivalent, is arranged between the interior ofhousing 6 of diameter Hd1 and the exterior ofbolt 101 of diameter BD1 so that in this position the compressed gas can exert a forward force onface 112 but cannot escape from the longitudinally-extending internalgas storage chamber 133, and the gas exerting a rearward force onface 110 cannot escape from between the exterior ofbolt 101 and the interior ofbolt housing 6. The surfaces of faces can have any shape such as flat or sloping. - In this embodiment of the invention when
trigger 7 is pulled to fire the marker,valve 9 is actuated so that compressed air is vented from variable lengthannular chamber 28 a andbolt 101 moves forward as the forward force exerted onface 112 overcomes the force exerted onface 110 which diminishes as the compressed air is vented fromannular chamber 28 a. The proximal end ofbolt 101 is provided with an internal, longitudinally extending portion of internal diameter Bd2 which seals against sealing means 161 b. The portion of internal diameter Bd2 extends towards the distal end so that whenbolt 101 is in the rearward position the portion of bolt of internal diameter Bd2 is sealed by sealingmeans 161 b against bolt guide 116 but as soon as bolt moves forward then this portion of internal diameter Bd2 starts to move away sealing means 161 b thereby opening a gap between sealing means 161 b and the portion of internal diameter Bd2 which allows compressed gas from internalgas storage chamber 133 via longitudinally extendingport 135 to pass the sealing means 161 b and exit into the breech and barrel, thereby propelling the paintball out of the barrel.Bolt 101 travels forward until it is arrested byrib 12. At thisposition valve 9 is activated to allow compressed gas fromsupply 111 to enter variable lengthannular chamber 28 a andpush bolt 101 rearwards. At the same time compressed gas refills longitudinally-extending internalgas storage chamber 133 viavalve 9,port 24 b,annular space 22 b, longitudinally extendingport 135 and after longitudinally extendingport 135 is obscured bybolt 101, the non-sealing contact betweenface 112 and the first portion ofbolt guide 117 which has a diameter greater than Bd2. Refilling of compressed gas stops when the pressure in longitudinally-extending internalgas storage chamber 133 is the same as that insupply 11. -
FIGS. 3 b, 3 c and 5 a-6 b show further embodiments of bolts in accordance with the present invention.Bolt 101 b shown inFIGS. 3 b, 5 a, 5 b has a third longitudinally-extendingsection 115 b of external diameter BD3 which extends from said second longitudinally-extending section 113 a distance BL3 towards saidsecond bolt end 5, wherein external diameter BD3 is greater than external diameter BD2. Third longitudinally extendingsection 115 b is provided with two longitudinally spaced circumferential sealing means, such as O-rings, X-rings, V-rings, resilient washers orequivalents bolt housing 6 on either side ofport 24 b, thereby preventing compressed gas from exiting through this port. -
Bolt 101 c shown inFIGS. 3 c, 6 a and 6 b has a third longitudinally-extendingsection 115 c of external diameter BD3 which extends from said second longitudinally-extending section 113 a distance BL3 towards saidsecond bolt end 5, wherein external diameter BD3 is greater than external diameter BD2. This forms aface 114 c of area A3 between said second and third longitudinally extendingsections 113 respectively 115 c. Third longitudinally extendingsection 115 c is provided with a single circumferential sealing means, such as an O-ring 118 c which are intended to seal against the inner surface ofbolt housing 6 to the rear ofport 24 b, thereby allowing compressed gas exiting through this port to exert a rearward force onface 114 c.
Claims (6)
1. Bolt 101 for a gas powered marker 1 wherein said bolt 101 comprises a hollow stepped body 103 with a first bolt end 105 and a second bolt end 107 separated by a tubular bolt wall 109 of length BL characterised in that said tubular bolt wall 109 comprises:
a first longitudinally-extending section 111, of external diameter BD1 and internal diameter Bd1, which extends from said first bolt end 105 a distance BL1 towards said second end 107;
a second longitudinally-extending section 113, of external diameter BD2 and internal diameter Bd2, which extends from said first longitudinally-extending section 111 a distance BL2 towards said second bolt end 105;
wherein external diameter BD2 is greater than internal diameter Bd2 which is greater than external diameter BD1.
2. Bolt in accordance with claim 1 characterised in that it further comprises,
a third longitudinally-extending section 115 b; 115 c of external diameter BD3 which extends from said second longitudinally-extending section 113 a distance BL3 towards said second bolt end 5, wherein external diameter BD3 is greater than external diameter BD2.
3. Bolt in accordance with claim 1 characterised in that the internal diameter Bd1 of first longitudinally extending section 11 is less than or equal to the internal diameter Bd2 of second longitudinally extending section 13.
4. Gas powered marker comprising a bolt guide 117 and a bolt in accordance with any of the previous claims slideably mounted on said bolt guide 117,
characterised in that said bolt guide 117 comprises a stepped body 119 with a first end 121 and a second end 123 separated by a wall 125 of length GL,
wherein said body 119 comprises:
a first longitudinally-extending section 127 with a maximum external diameter GD1 which extends from said first end 21 a distance GL1 towards said second end 123;
a second longitudinally-extending section 129 of maximum external diameter GD2 which extends from said first longitudinally-extending section 127 a distance GL2 towards said second end 123;
a third longitudinally-extending section 131 of external diameter GD3 which extends from said second longitudinally-extending section 129 a distance GL3 towards said second end 123; and
a longitudinally-extending internal chamber 133 which is closed at said first end and open at said second end 123;
wherein:
GD1 is less than GD2 which is less than GD3; and
GD2 is less than Bd2 which is less than GD3.
5. Gas powered marker in accordance with claim 4 wherein the sum of GL1 plus GL2 is less than or equal to BL.
6. Bolt in accordance with claim 2 characterised in that the internal diameter Bd1 of first longitudinally extending section 11 is less than or equal to the internal diameter Bd2 of second longitudinally extending section 13.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/141,254 US20090013984A1 (en) | 2007-06-18 | 2008-06-18 | Marker mechanism |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US94471707P | 2007-06-18 | 2007-06-18 | |
US12/141,254 US20090013984A1 (en) | 2007-06-18 | 2008-06-18 | Marker mechanism |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090013984A1 true US20090013984A1 (en) | 2009-01-15 |
Family
ID=40252079
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/141,254 Abandoned US20090013984A1 (en) | 2007-06-18 | 2008-06-18 | Marker mechanism |
Country Status (1)
Country | Link |
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US (1) | US20090013984A1 (en) |
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US20100006080A1 (en) * | 2008-07-09 | 2010-01-14 | Yi-Tsong Chen | Air-compressed bullet gun assembly |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: REGENCY PAINTBALL HANDELSBOLAG, SWEDEN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SPETS, PER FREDRICK;REEL/FRAME:021474/0862 Effective date: 20080831 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |