EP0440428B1 - Soupape pour arme à air comprimé - Google Patents

Soupape pour arme à air comprimé Download PDF

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Publication number
EP0440428B1
EP0440428B1 EP19910300683 EP91300683A EP0440428B1 EP 0440428 B1 EP0440428 B1 EP 0440428B1 EP 19910300683 EP19910300683 EP 19910300683 EP 91300683 A EP91300683 A EP 91300683A EP 0440428 B1 EP0440428 B1 EP 0440428B1
Authority
EP
European Patent Office
Prior art keywords
chamber
piston
air
valve assembly
valve
Prior art date
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.)
Expired - Lifetime
Application number
EP19910300683
Other languages
German (de)
English (en)
Other versions
EP0440428A3 (en
EP0440428A2 (fr
Inventor
Marcel Pearson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0440428A2 publication Critical patent/EP0440428A2/fr
Publication of EP0440428A3 publication Critical patent/EP0440428A3/en
Application granted granted Critical
Publication of EP0440428B1 publication Critical patent/EP0440428B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F41B11/723—Valves; Arrangement of valves for controlling gas pressure for firing the projectile only

Definitions

  • This invention relates to apparatus for use with air guns and more especially, but not exclusively, to a valve assembly for supplying air under pressure to the firing chamber of an air gun.
  • An air gun is known from GB-PS-1036183 which includes two coaxially spaced cylinders connected one to the other through an air transfer duct.
  • the inlet of one cylinder is connected to a source of air and the outlet of the other cylinder is connected to a valve which is opened on firing of the gun.
  • a valve assembly for supplying air under pressure to the firing chamber of an air gun, the assembly including a hollow cylindrical chamber which houses a slideable piston whose external diameter is slightly less than the internal diameter of the cylindrical chamber for admitting air under pressure to that portion of the chamber interior which lies to one side of the piston, means for causing the piston to move along the chamber, and means by which the compressed air is selectively released from the cylindrical chamber to the firing chamber of the air gun, the assembly being characterised in that an airflow passageway is defined between the outer periphery of the piston and the internal periphery of the chamber and in which the piston includes a leading end of reduced diameter which defines a sealing surface with a complementary surface of the adjacent end wall of the chamber, and means for biasing the said leading end of reduced diameter into sealing engagement with said complementary surface of the adjacent end wall of the chamber.
  • the piston is biased towards one end wall of the chamber by a spring, movement of the piston caused by the firing mechanism automatically effecting further compression of the air present in the chamber.
  • the valve assembly comprises a casing 1 enclosing a hollow cylindrical compression chamber 2 which houses a piston 3 mounted for sliding movement within the interior of the chamber 2.
  • One end of the piston 3 is shaped to define a sealing surface with a complementary surface of the adjacent end wall 5 of the casing when the piston 3 is moved to the right as shown.
  • the piston 3 is stepped along its length such that one end 6 is of a diameter less than that of its other end 7.
  • the diameter of the piston end 7 closely approaches the internal diameter of the chamber 1 to define an annular restricted flow passageway therebetween.
  • the piston 3 co-operates with a second piston 8 whose leading end protrudes into a bore 9 formed in the piston 3.
  • a spring 10 is mounted about the circumference of the second piston 8 and bears at one end against the trailing end of the stepped piston 3 and, at its other end, against a seal 11 mounted on the end of the piston 8 remote from the piston 3.
  • the leading end of the piston 8 is spaced from the end face of the bore 9 to define a reservoir 12 which communicates with that portion of the chamber 2 to the right hand side of the piston 3 as shown in Figure 1 by means of a passageway 14.
  • the piston 8 is formed with a central bore 15 which communicates with the left hand side (as shown in Figure 1) of the chamber 2 via a passageway 16 and with the right hand side (as shown in Figure 1) of the chamber 2 through the restricted passageway defined between the periphery of the piston 8 and the internal surface of the chamber 2. Further communication between the left and right hand sides of the chamber is effected when a passageway 17 formed in the piston 8 aligns with the passageway 14.
  • a pin may be provided to inhibit rotational movement of the piston 8 relative to piston 3 to ensure that the passageways 14,17 can properly be aligned.
  • the ends of the chamber 2 are closed by the end wall 5 and an end wall 18 which includes a passageway 19 for placing the left-hand side of the chamber 2 in communication with a conventional air pump.
  • the end wall 5 includes a passageway 20 for placing the right-hand side of the chamber 2 in communication with an air release chamber of the air gun on which the valve is mounted.
  • the passageway 20 is normally closed by the inclined end face 4 of the piston 3 making sealing contact with the complementary surface of the end wall 5. The piston is moved to the position shown in Figure 1, to open the passageway 20 when a piston stem 22 is propelled to the left as shown in the drawing by a firing mechanism of the gun.
  • air from a conventional air pump is admitted to the passageway 19 to move the seal 11 and the piston 8 against the action of the spring 10 to the right as shown to enable pressurised air to enter the chamber 2.
  • the pressurised air passes along the annular space defined between the periphery of the piston 3 completely to fill the left and right hand sides of the chamber 2 and the bore 15 with air to the required pressure.
  • the seal moves to the left to seal off the passageway 19.
  • the interior of the chamber is charged to the pressure of air admitted to the chamber by the pump.
  • the firing mechanism comes into contact with the stem 22, so moving the piston 3 against the action of the spring 10 further to compress the air present in the left-hand side of the chamber 2 and to place the passageways 17,14 in communication one with the other to cause air under increased pressure to flow from the left to the right hand side of the chamber.
  • movement of the piston opens the passageway 20 so enabling the re-compressed air present in the right hand side of the chamber to pass to the firing chamber of the air gun.
  • the back-pressure created within the passageway 20 due to the pressure of a projectile within the barrel of the gun ensures that the valve remains open for the requisite time period.
  • the compressed air entering the compression chamber 2 is subjected to a further and significant compression stage before the re-compressed air is released to the firing chamber of the air gun.
  • the air valve assembly illustrated in Figures 2 and 3 comprises a lower chamber 24 which houses a chargeable air bottle 25.
  • compressed air from the bottle 25 enters the chamber 26 in front of the piston 27 and also passes via a passageway 29 to a re-compression chamber 30.
  • the piston 27 is then advanced to the left further to compress the compressed air already present in the pump chamber 26 and the re-compression chamber 30.
  • a knock-open valve 31 including a piston 32 is located within the chamber 30, one end of the piston being shaped to define a seal with a complementary shaped surface 33 of the chamber.
  • the compressed air initially supplied by means of the bottle 25 is subjected to two further compression stages before it enters the firing chamber of the air gun.
  • the air valve assembly illustrated in Figure 4 includes a piston 40 moveable by a manually operated piston rod 41 through a compression chamber 42.
  • An 'O' ring seal 43 is carried by the piston 40 to provide a seal between the outer periphery of the piston and the inner periphery of the casing 44 of the chamber 42.
  • the piston 40 includes a leading section 45 of reduced diameter.
  • Also positioned in the air chamber is an end wall structure 46 formed with a channelled section 47 of internal diameter slightly greater than the diameter of the piston leading section 45.
  • the channel led section 47 carries an 'O' ring seal 48 to provide a seal between the outer periphery of the channel led section 47 and the adjoining internal wall of the chamber casing 44.
  • the structure 46 is formed with an outlet passageway 49 for conveying air under pressure to the firing chamber of the gun on which the valve is mounted.
  • the passageway 49 is normally closed by a knock-open valve 50 including a piston 51 having a shaped end 52 which seats against a complementary shaped surface of the structure 46.
  • the compressed air initially supplied to the chamber 42 is subjected to three further compression stages before it enters the firing chamber of the air gun.
  • the air valve comprises a piston 55 moveable through a compression chamber 57 and a manually operated piston 56 moveable through a second compression chamber 54.
  • An "O" ring seal 58 is carried by the piston 55 to provide a seal between the outer periphery of the piston 55 and the inner wall of the valve casing 71.
  • An “O" ring seal 61 is also carried by the piston 56 to provide a seal between the outer periphery of the piston 56 and the inner wall of the casing 71.
  • the piston 56 further includes a spring loaded valve 62 vented to atmosphere via a passageway 63. The spring loading is such that the valve 62 places the space between the pistons 55,56 into communication with the atmosphere when the pressure extant in the space is equal to or less than atmospheric pressure.
  • the piston 55 includes a section 64 of reduced diameter similar to piston section 45 of Figure 4. In this embodiment, however, the piston 55 is formed with an internal bore 65 within which is housed a spring loaded member 66.
  • the right hand end of the member 64 (as shown in Figure 5) is shaped to define a sealing surface 67 with a complementary shaped seating of the member 66 when the member 66 is urged to the right by the spring 68.
  • An apertured plate 69 (see Figure 6) is positioned over the left hand end of the bore 65.
  • An "O" ring seal is carried by the piston 55 to provide a seal between the piston 55 and the internal surface of the structure 59 and a further “O” ring 73 is carried by the structure 59 to provide a seal between the wall of the chamber 54 and the casing 71.
  • the left hand end of the chamber 57 is closed by a knock-open valve 74 including a piston 75.
  • the piston 75 has a shaped end which seats against a complementary seating of the structure 59 to close an exit passageway 76.
  • the piston 56 is advanced to the left as shown in the drawing to compress the air present in the chamber 54 to cause the valve 62 to move to the right to close off chamber 54 from the atmosphere.
  • the member 66 is moved to the left against the action of spring 68 to allow air under pressure to flow through the bore 65 and into recompression chamber 57.
  • the piston 56 continues to advance until it reaches the extent of its permitted movement at which time the face of the valve 62 lies in contact with or closely adjacent to the right hand side of the piston 55. Piston 56 is then partially retracted to cause the member 55 to move to the right to close off communication between chambers 54 and 57.
  • valve 62 opens to allow air from the atmosphere to flow through passageway 63 into chamber 54.
  • the piston 56 is then advanced once more towards piston 55 to move the piston 55 to the left to cause the pre-compressed air in chamber 57 to be re-compressed to a higher level than air in chamber 54. This last step can be repeated to provide even greater levels of air pressurisation within chamber 57.
  • the stem 77 On firing the air gun, the stem 77 is struck by the gun's firing mechanism to move the valve 74 off from its seating to re-compress further the air present in the chamber 57 and to enable the recompressed air to flow via the passageway 76.
  • the presence of a projectile in the firing chamber of the gun produces a higher build-up of air pressure in passageway 76 to act against the rear flange of piston 75 to cause chamber 57 to discharge completely.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Toys (AREA)
  • Nozzles (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Claims (5)

  1. Un ensemble soupape destiné à fournir de l'air sous pression à la chambre d'amorçage d'un fusil à air comprimé, l'ensemble comportant une chambre cylindrique creuse (2) dans laquelle est logé un piston coulissant (3) dont le diamètre externe est légèrement inférieur au diamètre interne de la chambre cylindrique (2) afin de permettre l'arrivée de l'air sous pression à la section de l'intérieur de la chambre située sur l'un des côtés du piston (3), moyen provoquant le déplacement du piston (3) le long de la chambre (2), et moyen (22) par lequel l'air comprimé est évacué de façon sélective de la chambre cylindrique vers la chambre d'amorçage du fusil à air comprimé, l'ensemble étant caractérisé en ce qu'un passage de débit d'air est défini entre la périphérie externe du piston (3) et la périphérie interne de la chambre (2) et dans lequel le piston comporte une section frontale (6) d'un diamètre réduit qui définit une surface d'étanchéité avec une surface complémentaire de la paroi d'extrémité adjacente de la chambre, et moyen (10) permettant de diriger ladite section frontale à diamètre réduit dans un emboîtage d'étanchéité avec ladite surface complémentaire de la paroi d'extrémité adjacente de la chambre.
  2. Un ensemble soupape, selon les stipulations de la revendication 1, caractérisé en ce que le mouvement du piston (3) est automatiquement effectué par un mécanisme de mise à feu afin de comprimer une quantité supplémentaire d'air présente dans la chambre (2).
  3. Un ensemble soupape, selon les stipulations de l'une quelconque des revendications précédentes, caractérisé en ce que le piston (3) comporte un alésage interne (9) duquel un deuxième piston coulissant (8) fait saillie, moyens (14, 17) étant prévus pour mettre l'intérieur de la chambre (2) en communication avec l'espace défini entre l'extrémité de l'alésage (9) qui est éloigné de la chambre (2) et le côté opposé du deuxième piston (8).
  4. Un ensemble soupape, selon les stipulations de la revendication 1 ou de la revendication 2, caractérisé en ce que le piston (32) est guidé par la tige d'une soupape de type à ouverture par percussion (31) déplaçable par le mécanisme de mise à feu du fusil à air comprimé.
  5. Un ensemble soupape, selon les stipulations de l'une quelconque des revendications 1 à 3, caractérisé en ce que l'air sous pression est admis dans la chambre à partir d'une bouteille à pression d'air actionnée par soupape.
EP19910300683 1990-01-31 1991-01-30 Soupape pour arme à air comprimé Expired - Lifetime EP0440428B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9002202 1990-01-31
GB9002202A GB9002202D0 (en) 1990-01-31 1990-01-31 Improvements in and relating to apparatus for use with air guns

Publications (3)

Publication Number Publication Date
EP0440428A2 EP0440428A2 (fr) 1991-08-07
EP0440428A3 EP0440428A3 (en) 1992-06-17
EP0440428B1 true EP0440428B1 (fr) 1996-08-14

Family

ID=10670218

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910300683 Expired - Lifetime EP0440428B1 (fr) 1990-01-31 1991-01-30 Soupape pour arme à air comprimé

Country Status (4)

Country Link
EP (1) EP0440428B1 (fr)
DE (1) DE69121256T2 (fr)
ES (1) ES2094197T3 (fr)
GB (1) GB9002202D0 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5890479A (en) * 1998-08-31 1999-04-06 Morin; Ernest Arthur Trigger assist system

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2003367C1 (ru) * 1992-09-23 1993-11-30 Товарищество с ограниченной ответственностью "Иста" Устройство дл выстреливани бросательных концов
US5494024A (en) * 1992-11-06 1996-02-27 Scott; Eric Paint ball gun and assemblies therefor
US6474325B2 (en) 1999-01-22 2002-11-05 Npf Limited Gas regulator
GB2356690B (en) * 1999-11-18 2004-03-03 Marcel Pearson Valve supplying air under pressure to an air gun
US6550468B1 (en) 2001-04-27 2003-04-22 Tippmann Pneumatics, Inc. Trigger assist mechanism and method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1206331B (de) * 1963-03-11 1965-12-02 Fritz Walther Druckluftschusswaffe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5890479A (en) * 1998-08-31 1999-04-06 Morin; Ernest Arthur Trigger assist system

Also Published As

Publication number Publication date
DE69121256T2 (de) 1997-03-20
DE69121256D1 (de) 1996-09-19
GB9002202D0 (en) 1990-03-28
EP0440428A3 (en) 1992-06-17
ES2094197T3 (es) 1997-01-16
EP0440428A2 (fr) 1991-08-07

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