Wad for shotgun shotshell
First Claim
1. A wad for shotgun shotshell having a case with primer which has therein a propellant and a projectile held in the case by a crimp provided on the case, said wad located in the case between the propellant and the projectile, comprising:
- a substantially cylindrical seal member located adjacent to the propellant for enclosing the propellant in the case to prevent the leakage of the explosion gas therethrough, and a rotor with a substantially cylindrical rotor body opposed to the seal member, said seal member and said rotor being connected to each other for relative rotation and having opposed end faces which are perpendicular to the axis of the shotshell and which are connected for relative surface contact sliding rotation when the opposed end faces come into contact with each other, said seal member having at least one hole for the passage of the explosion gas, and a recess which is located on the end face adjacent to the propellant to deform outwards the seal member by the explosion gas, said rotor being provided, on the end face opposed to the seal member, with a plurality of lidless gas jet grooves which are spaced from the axis and which extend in predetermined directions to be connected to the outer periphery of the rotor, said rotor being provided, on its outer periphery of the cylindrical rotor body, with a surrounding air space, said wad comprising at least one connecting lidless gas passage means defined by and between the rotor and the seal member, for connecting said hole on the seal member and the said lidless gas jet grooves on the rotor, said lidless gas jet grooves and the said connecting lidless gas passage means being both gas passages having a closed loop section to form complete closed gas passages when the opposed end faces of the rotor and the seal member come into press contact with each other due to the pressure caused by the explosion of the propellant, said rotor comprising means for transmitting the rotation of the rotor to the projectile without rotating the seal member.
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Accused Products
Abstract
A wad for a shotgun shotshell with a crimped case, comprising a seal member located adjacent to a propellant in the case and a rotor opposed to the seal member. The seal member and the rotor are interconnected for relative sliding and rotation and have opposed end faces. The seal member has at least one explosion gas passage hole. The rotor has, on the end face opposed to the seal member, gas jet grooves which are spaced from the axis and which extend in a predetermined direction to be connected to the outer periphery of the rotor and to the hole of the seal member. The rotor has blades or male-female connectors for transmitting the rotation of the rotor to a projectile in the case.
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Citations
23 Claims
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1. A wad for shotgun shotshell having a case with primer which has therein a propellant and a projectile held in the case by a crimp provided on the case, said wad located in the case between the propellant and the projectile, comprising:
- a substantially cylindrical seal member located adjacent to the propellant for enclosing the propellant in the case to prevent the leakage of the explosion gas therethrough, and a rotor with a substantially cylindrical rotor body opposed to the seal member, said seal member and said rotor being connected to each other for relative rotation and having opposed end faces which are perpendicular to the axis of the shotshell and which are connected for relative surface contact sliding rotation when the opposed end faces come into contact with each other, said seal member having at least one hole for the passage of the explosion gas, and a recess which is located on the end face adjacent to the propellant to deform outwards the seal member by the explosion gas, said rotor being provided, on the end face opposed to the seal member, with a plurality of lidless gas jet grooves which are spaced from the axis and which extend in predetermined directions to be connected to the outer periphery of the rotor, said rotor being provided, on its outer periphery of the cylindrical rotor body, with a surrounding air space, said wad comprising at least one connecting lidless gas passage means defined by and between the rotor and the seal member, for connecting said hole on the seal member and the said lidless gas jet grooves on the rotor, said lidless gas jet grooves and the said connecting lidless gas passage means being both gas passages having a closed loop section to form complete closed gas passages when the opposed end faces of the rotor and the seal member come into press contact with each other due to the pressure caused by the explosion of the propellant, said rotor comprising means for transmitting the rotation of the rotor to the projectile without rotating the seal member.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
Specification