Title:
Shotgun choke with integral wad-stopping feature
Kind Code:
A1


Abstract:
Disclosed herein is a shotgun choke with integral wad-stopping feature for use with an existing shotgun. The choke generally comprises a hollow cylinder having (an) a coupling for securing it to the muzzle end such as an external series of screw threads proximate one end for screw-insertion to the muzzle end of an existing shotgun, and an internal channel defined by an overall taper running from the inserted end to the output end to constrict shotgun pellets passing there through. The wad-stopping feature is accomplished with a series of raised internal projections or steps (raised from the internal walls of the channel), the projections being spaced throughout the tapered channel to retard and separate a traveling wad from the shot when passing there through.



Inventors:
Boyer, Frank (Glen Rock, PA, US)
Application Number:
10/800403
Publication Date:
01/20/2005
Filing Date:
03/12/2004
Assignee:
BOYER FRANK
Primary Class:
Other Classes:
89/14.6
International Classes:
F41A21/40; (IPC1-7): F41A21/00
View Patent Images:
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Primary Examiner:
JOHNSON, STEPHEN
Attorney, Agent or Firm:
OBERIKALER (BALTIMORE, MD, US)
Claims:
1. A choke with integral wad stopper for use with an existing shotgun, comprising: a hollow cylinder having a coupling at one end for concentrically securing it to a muzzle end of said shotgun, said cylinder being defined by an internal channel having a an increasingly smaller average internal diameter running away from the coupling end to constrict shotgun pellets passing there through; a plurality of raised annular projections spaced along said tapered channel to retard and separate wadding from behind said shotgun pellets while passing through said cylinder.

2. The choke according to claim 1, wherein said plurality of raised internal projections each further comprise an internal annular step along said cylinder.

3. A choke according to claim 1, wherein each of said plurality of raised annular projections comprises a sharp edge disposed toward said coupling end of said cylinder.

4. A choke according to claim 1, wherein each of said plurality of raised annular projections comprises a rounded edge disposed toward said coupling end of said cylinder.

5. A choke according to claim 2, wherein each internal step along said cylinder defines a smaller internal diameter within said cylinder.

6. A choke according to claim 5, further comprising a ramp transition between successive internal steps along said cylinder.

7. The choke according to claim 1, wherein said coupling further comprises an external series of screw threads for screw-insertion to the muzzle end of said existing shotgun.

8. The choke according to claim 9, further comprising a textured area along an outer surface of said cylinder to improve gripping while screwing it into the muzzle end of said existing shotgun.

9. A choke according to claim 1, wherein each of said raised annular projections further comprise a ramp transition to a next successive projection, thereby defining a constricting taper running away from said coupling end of the cylinder.

10. A choke according to claim 1, wherein said projections are connected along a spiral pattern.

Description:

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application derives priority from U.S. Provisional Patent Application Ser. No. 60/454,368 filed Mar. 12, 2003

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to shotgun chokes and, more particularly, to a choke (barrel) reducer which constrains the shot pattern of pellets fired by a shotgun, and which additionally slows the wad down so that it will not follow behind the shot.

2. Description of the Background

It is well-known that choke devices can be used to tighten the shot pattern of pellets fired by a shotgun. A choke is a removable interior tube at the end of the shotgun barrel that constricts shot dispersion. Choke tubes typically come in various configurations and can produce either a very wide shot dispersion, or a much tighter shot pattern. Different chokes are used for skeet, trap, and sporting clays, and hunting.

Typically, shotguns are now provided with a barrel whose muzzle has interior threads. This allows an appropriately made choke to be threaded onto the end of the barrel. This also allows the owner to interchange chokes so he can select his desired shot pattern.

A conventional shotgun shell also includes wadding in which the shot is encased. When the shotgun is fired, the wadding follows it up the barrel (actually propelling the shot until both leave the barrel). When the wading is ejected it affects the shot pattern, often resulting in a wider pattern than desired. There are no existing choke designs that inherently prevent this. There are, however, “wad-stoppers” to slow the wad as it moves outward from the barrel, thereby separating it from the pellets and minimizing its effect on the shot pattern. For example, U.S. Pat. No. 6,128,846 to Walker et al. issued Oct. 10, 2000 shows a shotgun choke tube with radial projections that engage and retard a wad/cup exiting the barrel. However, the projections are only operative on a plastic wad cup which carries the pellets, and such wad cups are typically used only in a portion of modern shotgun shells.

It would be greatly advantageous to provide a choke with integral wad stopping feature to serve both purposes, controlling the shot pattern and as well stopping the wad as it moves outward from the barrel, thereby separating it from the pellets and minimizing its effect on the shot pattern, regardless of whether the wadding is fabric, cardboard, or plastic shot cups.

SUMMARY OF THE INVENTION

It is, therefore, the primary object of the present invention to provide an improved choke design for a shotgun choke with integral wad-stopping feature operative on fabric or cardboard wadding, plastic shot cups, or otherwise.

It is another object to provide a choke that can be screw-attached to the muzzle end of a shotgun, the choke having an integral wad stopper to stop the wad as it moves outward from the barrel, thereby rapidly separating it from the pellets and minimizing its effect on the shot pattern.

These and other objects are accomplished by a shotgun choke with integral wad-stopping feature for use with an existing shotgun. The choke generally comprises a hollow cylinder having a coupling at one end for attaching it to the muzzle such as an external series of screw threads for screw-insertion to the muzzle end of an existing shotgun, a raised and textured opposing end for gripping and to act as an insertion stop against the shotgun barrel, and an internal channel defined by an overall taper running from the inserted end to the output end to constrict shotgun pellets passing there through. The wad-stopping feature is accomplished with a plurality of annular steps spaced along the tapered interior. The steps further comprise a series of raised annular internal projections, raised from the internal walls of the channel. The projections may take the form of circular steps or lands, or a pattern of individual projections being (equally) optimally spaced throughout the tapered channel to catch and separate a traveling wad from the shot when passing there through while assuring wad expulsion. The general taper accomplishes the purpose of constricting the shot pattern, while the stepped configuration along the taper retards the wad.

The present invention's design is simple and straightforward, highly effective, can be economically manufactured, and there is no wasted material in the production process.

BRIEF DESCRIPTION OF THE DRAWINGS

Other objects, features, and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments and certain modifications thereof when taken together with the accompanying drawings in which:

FIG. 1 is a side perspective view of the choke 2 with integral wad stopper according to the present invention.

FIG. 2 is a side cross-section of the choke 2 with integral wad stopper as in FIG. 1.

FIG. 3 is an end view of the choke 2 with integral wad stopper as in FIGS. 1-2.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 is a side perspective view of the choke 2 with integral wad stopper according to the present invention. The choke 2 generally comprises a hollow cylindrical section of machined stainless steel of approximately 3″ length and having a coupling (a series of screw threads 10) proximate one end for attachment such as by screw-insertion to the muzzle end of an existing shotgun. A raised textured section 12 acts as an insertion-stop within the shotgun barrel and also provides a better finger grip for insertion. When installed, the shot pellets pass through an inner channel 20 of the choke 2.

FIG. 2 is a side cross-section of the choke 2 with integral wad stopper as in FIG. 1, and FIG. 3 is an end view of the choke 2.

As with conventional chokes, the inner channel 20 is tapered slightly to constrict the pellets passing there through in order to control the shot pattern. As an example, for one of the popular model shotguns, the 12 gage, the taper runs from approximately a {fraction (7/10)}″ diameter at the input end to an approximate {fraction (13/20)}″ diameter {fraction (1/10)}″ inside the input end, although the degree and length of taper may be varied to accomplish a given shot pattern. Other bore diameter barrels require appropriate sizing with similar patters. The taper may be confined to a section of the channel 20 or may be formed as an overall taper running from the input end to the output end.

In accordance with the dual-purpose of the present invention, an integral wad-stopping feature is accomplished by forming a pattern of annular steps from the input end through approximately {fraction (2/3)} the length of the choke 2, the steps serving to catch and rapidly retard the wad following the shot. More specifically, a first step 30a is located approximately {fraction (1/10)}″ inside the input end, a second step 30b is located approximately {fraction (5/10)}″ inside the input end, a third step 30c is located approximately {fraction (9/10)}″ inside the input end, a fourth step 30d is located approximately 1 and {fraction (3/10)}″ inside the input end, and a fifth step 30e is located approximately 1 and {fraction (7/10)}″ inside the input end. Each of the steps 30a-e are raised approximately 0.004″ (0.1 mm), and the raised lip of each inward step-projection catches and progressively retards the traveling wad to separate it from the shot. In this regard, the raised lip of each inward step-projection 30a-e may be formed with a sharp or rounded edge for various degrees of wad retardation. The transition between each internal step 30a-e along said cylinder may be horizontal (the steps themselves defining a progressively smaller internal diameter within said cylinder), or the transitions may be ramped between successive internal steps to contribute to the overall taper.

In use, the hunter screw-attaches the choke 2 to the muzzle end of a shotgun by insertion of the receiving end into the barrel and by screw-threading threads 10 therein to fix the choke 2 in place. Upon firing the shotgun, the taper of the inner channel 20 constricts the pellets passing there through in order to control the shot pattern, and the integral wad stopper comprising steps 30a-e dramatically retards the wad as it moves outward from the barrel, thereby separating it from the pellets and minimizing its effect on the shot pattern.

The choke 2 according to the present invention is operative on fabric or cardboard wadding, plastic shot cups, or most other forms of wadding, it can be easily screw-attached to the muzzle end of a shotgun, and has been found to provide a highly accurate and tightly controlled shot pattern by virtue of the combined taper with integral progressive wad stopper to stop the and minimize its effect on the shot pattern.

Having now fully set forth the preferred embodiment and certain modifications of the concept underlying the present invention, various other embodiments as well as certain variations and modifications of the embodiments herein shown and described will obviously occur to those skilled in the art upon becoming familiar with said underlying concept. For example, the projections need not be annular, but alternatively may be connected along a spiral pattern.

It is to be understood, therefore, that the invention may be practiced otherwise than as specifically set forth in the appended claims.





 
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