CA1145201A

CA1145201A - Wad for making cartridges with single projectile

Info

Publication number: CA1145201A
Application number: CA000336675A
Authority: CA
Inventors: Giuseppino Sponga
Original assignee: Individual
Current assignee: Individual
Priority date: 1978-09-29
Filing date: 1979-09-28
Publication date: 1983-04-26
Also published as: FR2437604A3; GB2032070A; BE879017A; FR2437604B3; DE7926519U1; GB2032070B

Abstract

WAD FOR MAKING CARTRIDGES WITH SINGLE PROJECTILE

ABSTRACT OF THE DISCLOSURE

A wad for use with a single projectile for a firearm is made of a plastic material and serves as a container for the projectile. The external, cylindrical surface of the container including a plurality of radial, helicoidal fins and grooves.
Inner, longitudinally extending and radially oriented fins support the projectile and permit transport of air to the base wall of the container.

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Description

2~i~

WAD FOR MAKI~G CARTRIDGES WITH SI~GLE PROJECTILE

The present invention relates to a wad for making cartridges wikh single projectile to be used in hunting rifles and, more particularly, it relates to a wad stamped in plastic material and shaped like a container that encloses the projectile.
With hunting rifles of the smooth bore type and used in specified types of hunts, one might utilize single shot projectiles or spherical projectiles, so that the cart-ridges must be prepared accordingly. EIeretofore, as single projectiles, one used conventional projectiles consisting of a single lead body or of a lead body with one or more wads attached to the base of the body. Invariably, however, the known projectiles have always been made and used with a diameter corresponding to the inner diameter of the barrel.
Therefore, each type of projectile may be used substantially solely with rifles having a barrel with an inner diameter corresponding to the diameter of the projectile. Hereto-fore, therefore, it was not possible to use single projec-tiles of diameters smaller than that of the barrel.
It is therefore an object of the present invention to provide a wad for making cartridges with single projectile, said wad permitting the use of projectiles of I.D. even smaller tha~ that of the barrel or the rifles to be used.

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It is another object of the invention to provide a wad shaped like a container for enveloping the single projectile and acting substantially as caliber reducer or adaptor to adapt the diàmeter of ~he projectile to that of the karrel of the rifle and to permit the propulsion of the projectile without contacting the barrelO
It is still another object of the invention to provide a wad, for the purpose indicated above, advantageously stamped in plastic and having outer directional fins or wings and inner threading so as to permit both a correct shooting of projectile and the detachment thereof from the wad when exited from the barrel of the rifle.
These and other objects are provided by a wad which comprises a cylindrical body having an axial cavity or seat with a closed base and adapted to receive and withhold the single projectile. The cylindrical body has externally thereto a base portion with continuous surface and a plur-ality of radial fins or wings, inclined with respect to the generatrix and defining therebetween a plurality of grooves.
In the cavity or seat there are provided wings with crests forcedly hold the projectile and to define grooves for the passage of air toward the rear of the projectile, so as to aid with detachment of the projectile from the wad.

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Greater details of the invention will be evident from the following description thereof and from the accompanying drawings in which:
Figure 1 shows the wad in partial and longitudinal sectional view along lines I-I of Figure 2;
Figure 2 shows a transverse sectional view of the wad;
and Figure 3 shows sectionally a typical cartridge with single projectile made by using the wad of the present invention.
With reference to the drawin~s, numeral 1 represents in its entirety the body of the wad stamped in plastic and having a maximum outer diameter equal to the inner diameter of the shell 2 of the cartridge to be made (see Fig. 3).
The body 1 is substantially cyli.ndr.ical and llas a seat or cavity 3 axially thereto with a closed base 4. In the center of the base 4 there is provided a nose 5 which serves as support for the projectile 6. On the surface of the cavity 3 there are provided the longitudinal fins or wings 7 which define therebetween an equal number of grooves 8. These grooves serve to direct the air toward the base of the projectile, which base rests on nose 5. The crest 7' of the fins or wings 7 define, together, a seating of diameter substantially e~ual to, or slightly smaller than the diameter of the projectile 5, so that the latter might be inserted and forcedly held between the crests 7' (see Fig. 3).
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The body 1 has, externally thereof, a base portion 9 with continuous surface, adapted to adhere t~ the inner surface of the shell 2 of the cartridgeO Fr~m the base portion 9 and toward the upper extremity of the body 1 there is a plurality c~ radial fins lO which define the corresponding grooves 11. Grooves 11 have a helicoidal conformation, inclined with respect to the generatrix of the outer surface of the body.
When the projectile 6 is inserted in ~he cavity 3 of the wad, the two elements form a substantially single body which is used as such in making the cartridges for smooth-bored hunting rifles.
It is, thus, evident that the wad serves as a con-tainer for enclosing the projectile 6 and concurrently, as a reducer or adaptor for the adaptation of the projec-tile ~oth to the shell 2 and to ~he caliber of the barrel of the rifle in which the cartr~dge has to be employed.
Furthermore, the wad permits a correct guide for the pro-jectile along the barrel and, thanks to the outer fins 10, it permits also the application of a correct rotation of the projectile for a directional stabili~ation. On the other hand, when the projec~ile has exited from the barrel of the firearm, it is forced to separate from the wad and to continue along its own trajectory free from the wad.
The separation is caused by the air stream which, pasing along the grooves 8, defined by the internal fins 7, acts ;- ,~

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behind the projectile so as to push it axially away :Erom the wad .

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Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH
AN EXLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED
ARE DEFINED AS FOLLOWS

1. A wad adapted for coupling a projectile to a cartridge having an outer wall, said wad comprising a plastic cylindrical body having a maximum outside diameter substantially equal to the inside diameter of the shell of the cartridge, said wad having an open-ended axially arranged, cylindrical cavity including a base wall that is adapted to receive the projectile, the base wall of the cavity including a central, axially extending nose that is adapted to be contacted by and which is adapted to support only the central portion of the projectile, the internal wall surface of the cavity being provided with a plurality of circumferentially spaced apart grooves defined by a plurality of axially extending, circumferentially spaced apart radially oriented fins, said grooves extending from the base wall of the cavity at a location below the nose and therefore from axially behind the projectile to the open end of the cavity.

2. The wad according to claim 1, wherein the radially innermost end of each of said fins, in combina-tion, defines a diameter that is at least substantially equal to the diameter of the projectile so that the pro-jectile is frictionally retained within the cavity.

3. A wad for coupling a projectile to a cartridge according to claim 1, wherein said cylindrical body has an exterior surface with a plurality of circumferentially spaced radial fins defining helicoid grooves therebetween.

4. A wad according to claim 1, wherein the exterior surface of said cylindrical body tapers outwardly in a direction toward its base.