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US 10,866,072 B2Granted
Multi-piece cartridge casing and method of making
AssigneeSig Sauer, Inc.
InventorsJason W. Imhoff, Thomas J. Burczynski
Life of this patent
Estimating the term…
Abstract
A multi-piece ammunition cartridge casing includes a casing base extending along a central axis and defining an opening extending axially into the casing base from the distal base end. The inner casing surface defines a circumferential groove with a groove radius greater than a radius of an adjacent portion of the opening. The cartridge casing also includes a casing body with a proximal end portion disposed in the opening of the casing base. The casing body is secured to the casing base by way of a flange protruding radially outward in mating contact with the circumferential groove.
Claims22
An ammunition cartridge casing comprising:
- a casing base of a first metal, the casing base extending along a central axis from a proximal base end to a distal base end, the casing base having a generally cylindrical outer surface with an outer case diameter, and an inner casing surface defining an open region extending axially into the casing base from the distal base end to a distal inner face, wherein the inner casing surface has a shoulder portion extending radially inward and proximally from the distal base end, an axial portion extending proximally from the shoulder portion towards the distal inner face, and a circumferential groove between the distal inner face and the axial portion, wherein the circumferential groove has a groove radius greater than a radius of the axial portion, and wherein the casing base defines a primer pocket between the proximal base end and the distal inner face, the primer pocket in communication with the open region via a flash opening in the distal inner face;
- and
- a casing body of a second metal, the casing body secured to the casing base and having a tubular sleeve portion extending along the central axis from a proximal sleeve end to a distal sleeve end, a proximal body portion connected to the proximal sleeve end and including (i) a sleeve shoulder extending along the shoulder portion of the casing base, (ii) an axial sidewall extending along the axial portion of the casing base, (iii) a flange protruding radially outward from the axial sidewall and mating with the circumferential groove, and (iv) a proximal body wall engaging and extending radially inward along the distal inner face of the casing base, the proximal body wall defining a wall opening around the flash opening.
An ammunition cartridge casing comprising:
- a casing base extending along a central axis from a casing head to a distal base end, the casing base having a generally cylindrical outer surface with an outer case diameter, and an inner casing surface defining an open region extending axially into the casing base from the distal base end, wherein the inner casing surface has a shoulder portion extending radially inward and proximally from the distal base end, an axial portion extending proximally from the shoulder portion towards an inner face of the casing head, and a circumferential groove between the distal inner face of the casing head and at least a portion of the axial portion, wherein the circumferential groove has a groove radius greater than a radius of the axial portion;
- and
- a casing body secured to the casing base and having a tubular sleeve portion extending along the central axis from a proximal sleeve end to a distal sleeve end, a proximal body portion connected to the proximal sleeve end and including (i) a sleeve shoulder extending along the shoulder portion of the casing base, (ii) an axial sidewall extending along the axial portion of the casing base, and (iii) a flange protruding radially outward from the axial sidewall and mating with the circumferential groove;
- wherein the flange includes a proximal flange portion and a distal flange portion each extending radially outward in an axially spaced-apart orientation with respective outer radial end portions connected by an axial flange sidewall, and wherein the flange defines a locking chamber between the proximal flange portion and the distal flange portion.
1 more element
A cartridge casing comprising:
- a casing base of a first metal and extending along a central axis from a casing head to a distal base end, the casing base having an inside surface defining
- a primer pocket in the casing head, the primer pocket having a first diameter;
- an open region situated distally of the primer pocket, the open region having a distal portion with a second diameter and a proximal portion with a third diameter greater than the second diameter;
- and
- an annular wall between the primer pocket and the open region, the annular wall having a distal face and defining a flash opening between the primer pocket and the proximal portion of the open region, the flash opening having an opening diameter smaller than the first diameter and smaller than the third diameter;
- and
- a casing body of a second metal, the casing body secured to the casing base, the casing body having a tubular sleeve portion extending distally from the casing base and having a proximal body portion disposed in the open region of the casing base, wherein the proximal body portion extends along and mates with the inside surface of the open region, the proximal body portion further including a proximal body wall engaging and extending radially inward along the distal face of the annular wall and defining an opening around the flash opening.
4 more elements
Dependencies are inferred from the claim text.