CA1125558A - Replaceable choke for shotguns - Google Patents
Replaceable choke for shotgunsInfo
- Publication number
- CA1125558A CA1125558A CA324,350A CA324350A CA1125558A CA 1125558 A CA1125558 A CA 1125558A CA 324350 A CA324350 A CA 324350A CA 1125558 A CA1125558 A CA 1125558A
- Authority
- CA
- Canada
- Prior art keywords
- choke
- barrel
- recited
- bore
- gun
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
- F41A21/32—Muzzle attachments or glands
- F41A21/40—Chokes for shotguns, e.g. automatic chokes
Abstract
Abstract of the disclosure A replaceable choke is fixed to the muzzle end of a shotgun barrel and has a bore which makes an angle with the bore of the shotgun barrel for changing the major direction of the scatter of shot and thereby the position of the impact pattern with respect to the line of sight. By a selection of a choke of suitable angle of inclination, the marksman may correct his systematic aiming errors and thereby increase his hit percentage.
Description
S~ooth bore guns loaded with pellet cartridges are used for small game hunting and also for practice or compe-tition shooting, for example, clay pigeon shooting.
Shotguns with a fully cylindrical bore give a large impact pattern of unevenly distributed density and it may, therefore! be desirable in all forms of shooting with shot-guns, both hunting and competition shooting, to be able to change the form or density of the impact area of the scatter of shot, in particular if the distance to the target is relatively great. Use is then often made of so-called choke muzzles, which entails that a section of the bore of the shot-gun barrel closest to the muzzle is designed conically taper-ing in a direction towards the end of the muzzle. Alternative-ly, the bore of the gun barrel is extended by a so-called choke,which,by means of threading,is fixed to the gun muzzle. Examples of such chokes are to be found in, for example, French Patent Specification 2,321,104 and U.S. Patent Specification 2,837,856. Such chokes have also been used for altering the shape of the scatter of shot (please see, for example, Swedish Patent Specification 357,252).
It is common that a double-barrel shotgun has one barrel more choked than the other,such that the marksman may select the impact area he desires for a certain situation. In cases of, for example, shooting at birds in flight, or clay pigeons, the distance to the target is relatively short and the speed of the target is relatively great. Use in then made of an "open" choke. The marksman must also adopt a marked forward stance and discharge the shot very quickly. In such circum-~1 ~5558 stances, no aiming in the true sense of the word takes place,the marksman having time merely to see the target and the bead of the gun. Because of the above-mentioned forward stance, it is difficult for the marksman to find the correct height for the shot and most marksmen show a clear tendency in such situations to shoot too low. In recent years, guns of the so-called over-and-under type, that is to say guns with barrels placed verti-- cally adjacent one another, have become more and more common.
It is easier to aim with these guns than with the conventional double-barrel guns with the barrels placed side by side, but an over-and-under gun has a propensity to impart different heights to the discharges from the two barrels. This is because the lower barrel, which is usually discharged first, has its center line closer to the point of gravity of the weapon, whereas the upper barrel, which, obviously, lies considerably higher, shows a tendency to swing the gun upwardly and result in a higher point of impact.
Since the above circumstances are troublesome to many marksmen and lead to the unnecessary infliction of cruel, but not fatal, injury to game, a major aspect of the present inven-tion is to provide the marksman with a possibility of changing, by simple means, the impact point of his gun to a degree which suits his own needs and own shooting style.
To this end, the bore of the choke makes an angle with the bore of the shotgun barrel for changing the major direction of the shot scatter and, thereby, for changing the position of the impact pattern with respect to the line of sight of the gun.
The nature of the present invention and its aspects will be more readily understood from the following brief descrip-tion of the accompanying drawings, and discussion relatingthereto.
In the accompanying drawings:-- ~ZS5SIB
Fig. l~shows an example of a single-barrel shotgun with a replaceable choke according to the present invention;
Fig. 2 is a longitudinal section through the muzzle end of the gun shown in Fig. l;
; Fig. 3 is a view taken along the line III-III in Fig. 2;
Fig. 4 is a vertical section through the muzzle end of a double-barrel gun of the so-called over-and-under type and shows another example of the field of use of a choke according to the present invention;
Fig. 5 is a view taken along the line V-V in Fig. 4;
and Fig. 6 is a partial section of a single-barrel shotgun with a further example of a replaceable choke according to the present invention.
Fig. 1 schematically illustrates a shotgun with a shotgun barrel 1 which has a so-called ridge sight 2 and bead 3.
As is apparent from Fig. 2, the barrel has an extension 4 which, in this embodiment, is in the form of a fixedly retained outer sleeve 4 but which may also be designed integrally with the barrel 1. This outer sleeve 4 has inner threads 5 and has a screwed-in inner sleeve 6 which, at its outer end, has a knurled ring 7.
As opposed to prior art replaceable chokes, the inner sleeve 6 has a through-bore or hole which is not coaxial with - the longitudinal axis of the gun barrel but is inclined upwardly an angle v, which gives an elevation of the barrel muzzle by a distance x which discloses the difference in elevation between the inlet 8 of the inner sleeve and its outlet 9. This distance x is marked in Figs. 2 and 3. As a result of this design, the choke will not only compress the scatter of shot and render it more dense but also alter the major direction of the scatter of 1~5~58 shot by an angl~e v. By selecting a choke with the angle of inclination v in relation to the marksman's own shooting style, the marksman can elevate considerably the position of the shot and thereby improve his marksmanship, which experiments have proved. If the marksman were to display a tendency to aim the gun incorrectly in any other direction, the marksman may instead cause the inclined choke to aim the major direction of the scatter of shot in a direction other than upwardly. Thus, directions of offset of the impact point of the gun other than an elevation are conceivable, depending upon the circumstances of the marksman or his weapon.
Figs. 4 and 4 show how the present invention may be used in conjunction with a double-barrel gun of the so-called over-and-under type, but this embodiment may also be used for side-by-side shotguns.
The upper barrel 10 of the gun has an outer sleeve 12-o fixed at its muzzle end (the designations o and u relate to the upper and lower barrels of the gun, respectively), whereas the lower barrel 11 of the gun has an outer sleeve 12-u mounted thereon. In this embodiment, the two outer sleeves 12-o and 12-u are fixedly joined to the barrels by means of soldering 20 or the like, but the outer sleeves can, naturally, also be produced integrally with their associated barrels and possibly be independent of each other. Alternatively, they may be manu-factured in one joint piece and then together fixedly mounted on the barrels.
The outer sleeve 12-o of the upper barrel l0 is co-axial with the bore of the upper barrel. On the other hand, the outer sleeve 12-u of the lower barrel 11 is inclined an angle w with respect to the bore of the lower barrel, such that the muzzle of the outer sleeve 12-u is elevated a distance y (please see Fig. 5), the object of this elevation being to range l~S558 the impact patte~rns of the barrels at the same elevation a predetermined distance from the gun. In Fig. 4-0 (upper barrel) a choke 13 is inserted into the outer sleeve or barrel extension 12-o and the choke is fixedly retained in place by means of a screw sleeve 15 which is screwed into an inner thread 14 in the outer sleeve 12-o. The screw sleeve 15 may be rotated on the inner choke 13 but is axially fixed thereto by means of a flange edge 16 and a locking ring 17. The inner sleeve 23 of the lower barrel 11 is mounted in a corresponding manner in the barrel extension or outer sleeve 12-u of the lower barrel.
Longitudinal keyways 18 are provided in the outer sleeves or barrel extensions 12-o and 12-u, the keyways being intended for use in locking the chokes 13 and 23 against rotation by means of keys 19.
In Fig. 4, the chokes 13 and 23 have the same angle of inclination, even if the total inclination for the lower barrel is greater in view of the fact that the outer sleeve 12-u is also inclined with respect to the bore of the lower shotgun barrel 11.
Fig. 5 schematically illustrates how the outer sleeve 12-u elevates the muzzle a distance y and how the inner sleeve or choke 23 increases this elevation by a distance z.
In the above-described embodiments of the invention, the replaceable chokes have been fixedly mounted on the gun barrels by means of an inner thread either directly on the gun or by means of an intermediate sleeve. As an alternative to this construction, it is possible to use an outer thread on the muzzle of the barrel, in which event the choke, as such or a separate locking ring, has an inner thread for engagement with the thread on the muzzle of the barrel. Such an example of this modification is shown in Fig. 6.
Thus, Fig. 6 shows a gun barrel 24 which, at its outer 1~5558 or muzzle end, ~has been machined for receiving a choke 25 whose bore makes an angle v with the bore of the gun barrel. The choke is fixedly retained in place by means of an outer ring 26 with a knurled surface 27. The outer sleeve 26 has an inner thread 28 which engages with an outer thread 29 on the gun barrel.
SS51~
In order -.o red~ce iear on the choke according to the invention, the inlet end o, the choke may, as is apparent from the inlet end 8 of Fig. 2, be of slightly greater diameter than the bore of the gun barrel. This diameter difference rnay be used in all embodiments of the invention.
Shotguns with a fully cylindrical bore give a large impact pattern of unevenly distributed density and it may, therefore! be desirable in all forms of shooting with shot-guns, both hunting and competition shooting, to be able to change the form or density of the impact area of the scatter of shot, in particular if the distance to the target is relatively great. Use is then often made of so-called choke muzzles, which entails that a section of the bore of the shot-gun barrel closest to the muzzle is designed conically taper-ing in a direction towards the end of the muzzle. Alternative-ly, the bore of the gun barrel is extended by a so-called choke,which,by means of threading,is fixed to the gun muzzle. Examples of such chokes are to be found in, for example, French Patent Specification 2,321,104 and U.S. Patent Specification 2,837,856. Such chokes have also been used for altering the shape of the scatter of shot (please see, for example, Swedish Patent Specification 357,252).
It is common that a double-barrel shotgun has one barrel more choked than the other,such that the marksman may select the impact area he desires for a certain situation. In cases of, for example, shooting at birds in flight, or clay pigeons, the distance to the target is relatively short and the speed of the target is relatively great. Use in then made of an "open" choke. The marksman must also adopt a marked forward stance and discharge the shot very quickly. In such circum-~1 ~5558 stances, no aiming in the true sense of the word takes place,the marksman having time merely to see the target and the bead of the gun. Because of the above-mentioned forward stance, it is difficult for the marksman to find the correct height for the shot and most marksmen show a clear tendency in such situations to shoot too low. In recent years, guns of the so-called over-and-under type, that is to say guns with barrels placed verti-- cally adjacent one another, have become more and more common.
It is easier to aim with these guns than with the conventional double-barrel guns with the barrels placed side by side, but an over-and-under gun has a propensity to impart different heights to the discharges from the two barrels. This is because the lower barrel, which is usually discharged first, has its center line closer to the point of gravity of the weapon, whereas the upper barrel, which, obviously, lies considerably higher, shows a tendency to swing the gun upwardly and result in a higher point of impact.
Since the above circumstances are troublesome to many marksmen and lead to the unnecessary infliction of cruel, but not fatal, injury to game, a major aspect of the present inven-tion is to provide the marksman with a possibility of changing, by simple means, the impact point of his gun to a degree which suits his own needs and own shooting style.
To this end, the bore of the choke makes an angle with the bore of the shotgun barrel for changing the major direction of the shot scatter and, thereby, for changing the position of the impact pattern with respect to the line of sight of the gun.
The nature of the present invention and its aspects will be more readily understood from the following brief descrip-tion of the accompanying drawings, and discussion relatingthereto.
In the accompanying drawings:-- ~ZS5SIB
Fig. l~shows an example of a single-barrel shotgun with a replaceable choke according to the present invention;
Fig. 2 is a longitudinal section through the muzzle end of the gun shown in Fig. l;
; Fig. 3 is a view taken along the line III-III in Fig. 2;
Fig. 4 is a vertical section through the muzzle end of a double-barrel gun of the so-called over-and-under type and shows another example of the field of use of a choke according to the present invention;
Fig. 5 is a view taken along the line V-V in Fig. 4;
and Fig. 6 is a partial section of a single-barrel shotgun with a further example of a replaceable choke according to the present invention.
Fig. 1 schematically illustrates a shotgun with a shotgun barrel 1 which has a so-called ridge sight 2 and bead 3.
As is apparent from Fig. 2, the barrel has an extension 4 which, in this embodiment, is in the form of a fixedly retained outer sleeve 4 but which may also be designed integrally with the barrel 1. This outer sleeve 4 has inner threads 5 and has a screwed-in inner sleeve 6 which, at its outer end, has a knurled ring 7.
As opposed to prior art replaceable chokes, the inner sleeve 6 has a through-bore or hole which is not coaxial with - the longitudinal axis of the gun barrel but is inclined upwardly an angle v, which gives an elevation of the barrel muzzle by a distance x which discloses the difference in elevation between the inlet 8 of the inner sleeve and its outlet 9. This distance x is marked in Figs. 2 and 3. As a result of this design, the choke will not only compress the scatter of shot and render it more dense but also alter the major direction of the scatter of 1~5~58 shot by an angl~e v. By selecting a choke with the angle of inclination v in relation to the marksman's own shooting style, the marksman can elevate considerably the position of the shot and thereby improve his marksmanship, which experiments have proved. If the marksman were to display a tendency to aim the gun incorrectly in any other direction, the marksman may instead cause the inclined choke to aim the major direction of the scatter of shot in a direction other than upwardly. Thus, directions of offset of the impact point of the gun other than an elevation are conceivable, depending upon the circumstances of the marksman or his weapon.
Figs. 4 and 4 show how the present invention may be used in conjunction with a double-barrel gun of the so-called over-and-under type, but this embodiment may also be used for side-by-side shotguns.
The upper barrel 10 of the gun has an outer sleeve 12-o fixed at its muzzle end (the designations o and u relate to the upper and lower barrels of the gun, respectively), whereas the lower barrel 11 of the gun has an outer sleeve 12-u mounted thereon. In this embodiment, the two outer sleeves 12-o and 12-u are fixedly joined to the barrels by means of soldering 20 or the like, but the outer sleeves can, naturally, also be produced integrally with their associated barrels and possibly be independent of each other. Alternatively, they may be manu-factured in one joint piece and then together fixedly mounted on the barrels.
The outer sleeve 12-o of the upper barrel l0 is co-axial with the bore of the upper barrel. On the other hand, the outer sleeve 12-u of the lower barrel 11 is inclined an angle w with respect to the bore of the lower barrel, such that the muzzle of the outer sleeve 12-u is elevated a distance y (please see Fig. 5), the object of this elevation being to range l~S558 the impact patte~rns of the barrels at the same elevation a predetermined distance from the gun. In Fig. 4-0 (upper barrel) a choke 13 is inserted into the outer sleeve or barrel extension 12-o and the choke is fixedly retained in place by means of a screw sleeve 15 which is screwed into an inner thread 14 in the outer sleeve 12-o. The screw sleeve 15 may be rotated on the inner choke 13 but is axially fixed thereto by means of a flange edge 16 and a locking ring 17. The inner sleeve 23 of the lower barrel 11 is mounted in a corresponding manner in the barrel extension or outer sleeve 12-u of the lower barrel.
Longitudinal keyways 18 are provided in the outer sleeves or barrel extensions 12-o and 12-u, the keyways being intended for use in locking the chokes 13 and 23 against rotation by means of keys 19.
In Fig. 4, the chokes 13 and 23 have the same angle of inclination, even if the total inclination for the lower barrel is greater in view of the fact that the outer sleeve 12-u is also inclined with respect to the bore of the lower shotgun barrel 11.
Fig. 5 schematically illustrates how the outer sleeve 12-u elevates the muzzle a distance y and how the inner sleeve or choke 23 increases this elevation by a distance z.
In the above-described embodiments of the invention, the replaceable chokes have been fixedly mounted on the gun barrels by means of an inner thread either directly on the gun or by means of an intermediate sleeve. As an alternative to this construction, it is possible to use an outer thread on the muzzle of the barrel, in which event the choke, as such or a separate locking ring, has an inner thread for engagement with the thread on the muzzle of the barrel. Such an example of this modification is shown in Fig. 6.
Thus, Fig. 6 shows a gun barrel 24 which, at its outer 1~5558 or muzzle end, ~has been machined for receiving a choke 25 whose bore makes an angle v with the bore of the gun barrel. The choke is fixedly retained in place by means of an outer ring 26 with a knurled surface 27. The outer sleeve 26 has an inner thread 28 which engages with an outer thread 29 on the gun barrel.
SS51~
In order -.o red~ce iear on the choke according to the invention, the inlet end o, the choke may, as is apparent from the inlet end 8 of Fig. 2, be of slightly greater diameter than the bore of the gun barrel. This diameter difference rnay be used in all embodiments of the invention.
Claims (8)
1. A replaceable choke for shotguns adapted to be mounted to the muzzle of the shotgun barrel wherein the bore of the choke makes an angle with the bore of the shotgun barrel for changing the major direction of the shot scatter and, thereby, the position of the impact pattern with respect to the line of sight.
2. The choke as recited in claim 1, wherein the replaceable choke is retained against rotation by means of keyways and keys.
3. The choke as recited in claim 1, wherein the choke is inserted into a gun barrel extension sleeve and re-tained by means of a screw sleeve rotatable on the choke.
4. The choke as recited in claim 3, wherein the choke is axially fixed by means of a locking ring on said screw sleeve.
5. The choke as recited in claim 3, wherein the choke is axially fixed by means of a depression of the edge of said screw sleeve.
6. The choke as recited in claim 1, 2 or 3, wherein the inlet end of the choke is of slightly greater diameter than the bore of the shotgun barrel.
7. The choke as recited in claim 1 wherein the choke is fixedly mounted on the gun barrel by means of an outer thread on the muzzle of the barrel.
8. The choke as recited in claim 1, wherein the choke is fixedly mounted on the gun barrel by means of an outer thread on the muzzle of the barrel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7803705-8 | 1978-04-03 | ||
| SE7803705A SE422110B (en) | 1978-04-03 | 1978-04-03 | EXCHANGABLE TRUCK DRILL SHELF FOR HAGELGEVER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1125558A true CA1125558A (en) | 1982-06-15 |
Family
ID=20334474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA324,350A Expired CA1125558A (en) | 1978-04-03 | 1979-03-28 | Replaceable choke for shotguns |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5512389A (en) |
| BE (1) | BE875228A (en) |
| CA (1) | CA1125558A (en) |
| DE (1) | DE2912842A1 (en) |
| FI (1) | FI66985C (en) |
| FR (1) | FR2422129A1 (en) |
| GB (1) | GB2018960A (en) |
| IT (1) | IT1112456B (en) |
| SE (1) | SE422110B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19510754C2 (en) * | 1995-03-24 | 1997-10-02 | Dieter Keppeler | Gun barrel for firearms |
| FI111190B (en) * | 1998-07-06 | 2003-06-13 | Jukka Toivanen | Auxiliary device for shotguns |
| IT201600117919A1 (en) * | 2016-11-22 | 2018-05-22 | Fabbrica Darmi Pietro Beretta S P A | DEVICE FOR EXTENDING A FIRE WEAPON |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5016717Y2 (en) * | 1971-06-07 | 1975-05-23 |
-
1978
- 1978-04-03 SE SE7803705A patent/SE422110B/en not_active IP Right Cessation
-
1979
- 1979-03-28 CA CA324,350A patent/CA1125558A/en not_active Expired
- 1979-03-28 FI FI791029A patent/FI66985C/en not_active IP Right Cessation
- 1979-03-30 DE DE19792912842 patent/DE2912842A1/en not_active Withdrawn
- 1979-03-30 BE BE194330A patent/BE875228A/en unknown
- 1979-04-02 GB GB7911397A patent/GB2018960A/en not_active Withdrawn
- 1979-04-02 IT IT21485/79A patent/IT1112456B/en active
- 1979-04-03 FR FR7908361A patent/FR2422129A1/en not_active Withdrawn
- 1979-04-03 JP JP3941779A patent/JPS5512389A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| IT7921485A0 (en) | 1979-04-02 |
| SE7803705L (en) | 1979-10-04 |
| FI66985C (en) | 1984-12-10 |
| SE422110B (en) | 1982-02-15 |
| FI791029A (en) | 1979-10-04 |
| DE2912842A1 (en) | 1979-10-04 |
| FR2422129A1 (en) | 1979-11-02 |
| FI66985B (en) | 1984-08-31 |
| JPS5512389A (en) | 1980-01-28 |
| BE875228A (en) | 1979-07-16 |
| GB2018960A (en) | 1979-10-24 |
| IT1112456B (en) | 1986-01-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |