US1803946A - Automatic firearm actuated by compressed air - Google Patents

Automatic firearm actuated by compressed air Download PDF

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Publication number
US1803946A
US1803946A US387431A US38743129A US1803946A US 1803946 A US1803946 A US 1803946A US 387431 A US387431 A US 387431A US 38743129 A US38743129 A US 38743129A US 1803946 A US1803946 A US 1803946A
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US
United States
Prior art keywords
piston
breech
actuated
air
compressed air
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
US387431A
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English (en)
Inventor
Revelli Bethel Abiel
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.)
METALLURG BRESCIANA GIA TEMPIN
METALLURGICA BRESCIANA GIA TEMPINI
Original Assignee
METALLURG BRESCIANA GIA TEMPIN
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by METALLURG BRESCIANA GIA TEMPIN filed Critical METALLURG BRESCIANA GIA TEMPIN
Application granted granted Critical
Publication of US1803946A publication Critical patent/US1803946A/en
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
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A3/00—Breech mechanisms, e.g. locks
    • F41A3/64—Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • F41A3/78—Bolt buffer or recuperator means
    • F41A3/90—Fluid buffers
    • F41A3/94—Fluid buffers in combination with spring buffers

Definitions

  • the present invention has for its object an automaticv fire-arm actuated by Vcompressed air and has lforgits aim to simplify v the construction while obtaining a regular action and a very much reduced recoil, in addition to a firing speed which can be reduced at will down toa few rounds per minute.
  • the fundamental idea-on which the present invention is based consists in that the breech is caused to act as a compression cylinder, and the obturator which is movable directlyY in the said breech acts as a piston compressor, discharge valve and admission valve for air thus allowing different pressures to be obtained during the phases of the automatic cycle of action.
  • the breech is caused to act as a compression cylinder
  • the obturator which is movable directlyY in the said breech acts as a piston compressor, discharge valve and admission valve for air thus allowing different pressures to be obtained during the phases of the automatic cycle of action.
  • this device' several members are dispensed with,'that is to say special closing zo'devices, spring shocky absorbers retarding .means and the like, the same results being obtained as with the said special members but in a ybetter andlmore economical way.
  • FIG. 1 shows the detail thereof.
  • ' - Figures 3 and'i are diagrams of the pressure in the breech'chamber during the course respectively of the recoiland return Vof the obturator.
  • Figure 5- is a diagrammatic part axial section of the fire-arm provided with devices for-regulating the pressure according to the Apresent invention.
  • the piston may be provided with one or more piston rings 5 of the type used in pistons of internal combustion engines.
  • the recuperating spring '6 Between the piston 3 and the cap 4 is arranged the recuperating spring '6.
  • the percussionmeans consists of a small lever V'7A (see Figure 2)' which strikes thecap of 'the cartridge when on the' piston reaching its closing position the external arm of the v'lever strikes against a projection 8 of the breech chamber.
  • valve is constituted byv a rod 9 connected to the piston 3 and passing through a hole in the cap 4 and provided with a stuffing box 10.
  • the rod presents two series offlongitudinaldischarge grooves 11 and 12, which allow the air to pass when they are within thehole in the cap.y
  • the fire-arm then acts as follows:
  • the piston commences its recoil (point A ofthe diagram Figure ⁇
  • the discharge port 11- is in the opening position during theA part AB of' thecurve (, Figure'3), that is ⁇ to say the air can. pass out: freely and thepressure remains normal.
  • lVhenv the cylindrical portion of thel rod 9 commences to slide in the cap the compression chamber isv closed and the air is compressed, thus ⁇ absorbing the recoil ofthe piston.
  • An improvement in the said system is effected by a supplementaryy discharge which remains open throughout-.the whole cycle -and has .-for its effect to lower throughout ⁇ the whole diagram the curves of compression and ⁇ depression thus producing an action analogous tothat described above but having a different firing speed.
  • supplementary discharge there couldY be two,l three four, orV more firing speeds, or even a continuous variation. of speed.
  • Figure 6 represents another form of construction in which in order to dispense with the rod 9 shown in figure 5, a Xed opening 13 is made in the breech chamber and a valve 14 is provided in the cap 4.
  • the opening 13 remains open during a certain part of the travel of the piston 3 and is subsequently closed by the piston itself during the remaining portion of the travel.
  • the valve 14 only opens when it is struclrby the piston at the end of the recoil and is closed again when the piston commences its return travel.
  • Figure 7 represents another form in. whiclipiston rings Aare provided at the tworends ofthe piston and lin which any form of valve is replaced byffixed openings.
  • the piston 3 A has a longitudinal passage 15 open at the end and a window of elongated formV 16, and in the wall of the breech case 1 a fixed port 17 is provided.
  • This form of construction gives the same diagramas is shown in Figuresy 3 and 4.
  • Theopening 17 V- allows air to pass during the'first part of therecoil travel until itis closed by the body of the'piston- 3 itself.
  • the ⁇ period of compression ceases when the window 16is opposite the opening ⁇ 17 of: the breech chamber.
  • opening being provided in; the wall of said chamber inl proximity tothe reary end of said piston when it is in.l itslv foremost position 1n such a way asl to be4 closed byY said piston when it has. effecteda predetermined initial part of its recoilftravel-and avalve arranged in the rear end ofsaidcompression chamber, said valve being yopened by ⁇ the piston before this latter reaches theend of its recoil travel.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Closing And Opening Devices For Wings, And Checks For Wings (AREA)
US387431A 1929-06-06 1929-08-21 Automatic firearm actuated by compressed air Expired - Lifetime US1803946A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT338888X 1929-06-06

Publications (1)

Publication Number Publication Date
US1803946A true US1803946A (en) 1931-05-05

Family

ID=11238423

Family Applications (1)

Application Number Title Priority Date Filing Date
US387431A Expired - Lifetime US1803946A (en) 1929-06-06 1929-08-21 Automatic firearm actuated by compressed air

Country Status (3)

Country Link
US (1) US1803946A (de)
DE (1) DE535599C (de)
GB (1) GB338888A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1696197A1 (de) * 2005-02-23 2006-08-30 Simon Trendall Hydraulischer Verschlussmechanismus für Feuerwaffen
IT201700112064A1 (it) * 2017-10-05 2019-04-05 Renzo Armellin Dispositivo pneumatico con pistone otturatore mobile nelle armi da fuoco di grosso calibro con chiusura labile

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3739448A1 (de) * 1987-09-07 1989-03-16 Evitec Entwicklung Vertrieb Automatische feuerwaffe
CN1263408C (zh) 2000-04-13 2006-07-12 基特鞋业有限公司 鞋子及其制作方法
DE102012022683A1 (de) * 2012-11-21 2014-05-22 Rheinmetall Waffe Munition Gmbh Massenverriegelbares Waffenverschlusssystem
IT201700080197A1 (it) * 2017-07-17 2019-01-17 Renzo Armellin Dispositivo per arma da fuoco con otturatore a semplice effetto con chiusura labile con ritardo di apertura.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1696197A1 (de) * 2005-02-23 2006-08-30 Simon Trendall Hydraulischer Verschlussmechanismus für Feuerwaffen
IT201700112064A1 (it) * 2017-10-05 2019-04-05 Renzo Armellin Dispositivo pneumatico con pistone otturatore mobile nelle armi da fuoco di grosso calibro con chiusura labile

Also Published As

Publication number Publication date
GB338888A (en) 1930-11-27
DE535599C (de) 1931-10-13

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