US 4,977,815 AGranted

Self cleaning automatic machine pistol and silencer for the same

OwnerMark L. Stephensinventor

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Abstract

An automatic machine pistol is provided, which is not subject to fouling, which is compact and light while incorporating a pneumatic recoil buffer, which resists muzzle climb, and which can be accessed and cleaned without disassembly. The machine pistol is comprised of a reciprocating bolt within a housing of the pistol. The reciprocating bolt is carried within the housing on four rails by eight roller bearings. No sliding contact is made between the bolt and any other portion of the pistol. A portion of the high pressure gas from the barrel is bled through a bleed hole in the barrel block or barrel into a gas port tube which is telescopically inserted into the bolt. The gas port tube delivers the portion of the discharge gas in a forward direction in opposition to the motion on recoil. An upwardly directed nozzle is communicated to the receiving bore within the bolt. The direction and force of the discharge gas within the gas port delivery tube and receiving bore within the bolt resist and buffers recoil, while the upwardly directed nozzle develops a downward thrust on the muzzle end of the pistol to avoid muzzle climb.

Claims13

Dependent claims

An automatic machine pistol comprising:

a body including a barrel and barrel block;
a bolt reciprocating within said body and with respect to said barrel and barrel block;
a bleed port defined through said barrel block to continuously allow a predetermined degree of gaseous communication from said barrel through said bleed port;
a gas port tube fixed with respect to said body and in gaseous communication with said bleed port for receiving gas from said barrel and directing said gas forwardly within said pistol;
a receiving bore defined in said bolt for telescopically receiving said gas port tube therein, one end of said gas port tube continuously positioned within said bore as said bolt reciprocates with respect to said body and gas port tube which is fixed with respect to said body;
and
an exhaust port communicating with said receiving bore to continuously allow escape of gas from said receiving bore to define a predetermined degree of flow resistance to gas flowing from said barrel through said bleed port and gas port tube into said receiving bore to resistively cushion recoil allowing a predetermined degree of recoil, so that a portion of high pressure gas is bled from said barrel through said bleed port and into said gas port tube and into said receiving bore within said bolt to resist recoil of said bolt upon firing of said pistol.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/347,766Filed 5 May 1989
Granted: 18 Dec 1990
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F41A 19/31
In bolt-action guns: sear arrangements therefor
F41A 3/62
Breech mechanisms, e.g. locks: using combustion gas pressure for adding to the mechanical locking action, or for delaying breech opening movement
F41A 3/64
Breech mechanisms, e.g. locks: mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
F41A 9/70
Box magazines having a cartridge follower: arrangements thereon for discharging, e.g. cartridge followers or discharge throats