Cartridge Wad (Patent No: 659145)

Inventor: Hellis, Stuart C.

Location: Calgary

Comments: N/A

Description:
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A wad for a cartridge comprising a cylindrical wall having end closures at opposite ends thereof forming a hollow, substantially airtight body, the outer diameter of said cylindrical wall being less than the inner diameter of the casing wall of the cartridge, the peripheral edges of said end closures projecting beyond said cylindrical wall of the wad and adapted to contact the inner surface of said cartridge casing wall to define an annular space between said cylindrical wall of the wad and the inner surface of said casing wall, said space serving to permit radial expansion of the cylindrical wall of the wad when the wad is subjected to compression.

2. A wad for a cartridge comprising a pair of hollow cups, each of said cups having a substantially cylindrical wall open at one end and closed at the other end by a substantially circular base, the base of each of said cups having a diameter greater than the diameter of the wall of either cup, the wall of one of said cups being adapted to be inserted inside the wall of the other cup to form a substantially airtight unit, said unit being adapted for insertion within the cartridge whereby the peripheral surfaces of said bases contact the interior surface of the casing wall to define an annular space between said unit and said casing wall.

3. A wad for a cartridge according to claim 2 in which the walls of the cups are thin in comparison to the thickness of the bases of the cups and the walls of the two cups are of slightly different diameter so that one cup fits inside the other.

4. A wad for a cartridge according to claim 2 or 3 in which the outer wall of the inner cup tapers inwardly in a direction from the closed end to the open end thereof and the inner wall of the outer cup tapers outwardly in a direction from the closed end to the open end thereof, whereby the walls of said two cups are adapted to fit snugly one within the other to form a substantially airtight unit.

5.A cartridge including a casing having a substantially cylindrical casing wall closed at one end by a base, a primer pocket in said base, a battery cup primer retained in said primer pocket, and closure means at the end of said casing opposite said base, said closure means holding a wad, a propellant and a shot charge enclosed within the casing wall said wad comprising a pair of hollow cups, each of said cups having a substantially cylindrical wall open at one end and closed at the other end by a substantially circular base, the wall of one of said cups being substantially disposed within the wall of the other cup, the base of each of said cups having a diameter greater than the diameter of the wall of either cup, and the peripheral surfaces of the bases of said cups being in contact with the inner surface of the casing wall of the cartridge whereby a space is defined between the exterior surface of the outermost cup wall and the inner surface of the casing wall.

6. A cartridge according to claim 5 in which the walls of the cups are thin in comparison to the thickness of the bases of the cups and the walls of the two cups are of slightly different diameter so that the wall of one cup is adapted to fit within the wall of the other cup.

7. A cartridge according to claim 5 or 6 in which the outer wall of the inner cup tapers inwardly in a direction from the closed end to the open end thereof and the inner wall of the outer cup tapers outwardly in a direction from the closed end to the open end thereof, whereby the walls of said two cups are adapted to fit snugly one within the other to form a substantially airtight unit.

8. A cartridge according to claim 5 including a second cartridge according to claim 8 in which the second wad is a substantially cylindrical wad of expanded polystyrene foam.