Blank firing attachment

Claim 2

A blank firing attachment for a rifle barrel the muzzle end of which is provided with annular shoulder means, said attachment comprising a cylindrical housing having one end thereof open and dimensioned to slideably fit over said shoulder means, split sealing ring means disposed for engagement with the side of said shoulder means remote from the muzzle end of said barrel and in abutment with the open end of said housing, a collet surrounding said ring means and threadedly engaged with cooperating means on the external surface of said housing adjacent to the open end thereof, the internal surface of said collet remote from said cooperating means defining a cam surface for engaging said ring means whereby, in response to adjustment of said collet relative to said housing, said ring means is brought into sealing engagement with said open end and behind said shoulder means, and vent means disposed in said cylindrical housing for controlled release of expanding gas pressures in said barrel incident to firing.

Claim 3

The invention as defined in claim 1 and wherein said split sealing ring means comprises a single ring having the body thereof diagonally split.

Claim 4

The invention as defined in claim 1 and wherein said split sealing ring means comprises a pair of rings axially abutted with each other, the abutting surfaces thereof being flat, and each of said rings having the body thereof diagonally split, the diagonal splits of said rings being disposed circumferentially spaced apart.

Claim 5

The invention as defined in claim 1 and wherein said vent means comprises a hole through saiD housing disposed apart from axial alignment with the bore of said barrel.

Claim 6

In an automatic weapon having a barrel and means associated with the muzzle end of said barrel providing an annular shoulder adjacent to and rearwardly of said muzzle end, a blank firing attachment for said weapon comprising a cylindrical housing having one end thereof open and dimensioned to slideably fit over said annular shoulder, the opposite end of said housing being disposed coextensive with said muzzle end and said associated means, split sealing ring means disposed for engagement with the side of said shoulder remote from said muzzle end and in abutment with said open end, a collet encompassing said ring means and a portion of said housing adjacent said open end, cooperating means on said collet and said housing for effecting axial adjustment of said collet relative to said housing, the internal surface of said collet defining a cam surface engageable with said ring means in response to adjustment of said collet relative to said housing, said cam surface being effective to collapse said ring means into sealing engagement with said annular shoulder and said open end, and means in said housing for venting the expanding gases in said barrel incident to firing said weapon.

Claim 7

In an automatic weapon having a barrel and means associated with the muzzle end of said barrel providing an annular shoulder adjacent to and rearwardly of said muzzle end, a blank firing attachment for said weapon comprising a cylindrical housing having one end thereof open and dimensioned to slideably fit over said annular shoulder, the opposite end of said housing being disposed coextensive with said muzzle end and said associated means, split sealing ring means disposed for engagement with the side of said shoulder remote from said muzzle end and in abutment with said open end, a collet encompassing said ring means and a portion of said housing adjacent said open end, cooperating means on said collet and said housing for effecting axial adjustment of said collet relative to said housing, the internal surface of said collet defining a cam surface engageable with said ring means in response to adjustment of said collet relative to said housing, said cam surface being effective to collapse said ring means into sealing engagement with said annular shoulder and said open end, and means in said housing for venting the expanding gases in said barrel incident to firing said weapon.

Claim 8

The invention as defined in claim 5 and wherein said vent means comprises an opening in said housing disposed apart from axial alignment with said barrel bore and dimensioned for controlled release of said expanding gases.

Claim 9

The invention as defined in claim 6 and wherein said sealing ring means comprises a single ring having the body thereof diagonally split.

Claim 10

The invention as defined in claim 6 and wherein said sealing ring means comprises a pair of juxtaposed rings the adjacent surfaces thereof being flat and each of said rings having the body thereof diagonally split, the diagonal splits thereof being disposed spaced apart.