US2888769A - Choke mechanism for firearms - Google Patents

Choke mechanism for firearms Download PDF

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Publication number
US2888769A
US2888769A US580739A US58073956A US2888769A US 2888769 A US2888769 A US 2888769A US 580739 A US580739 A US 580739A US 58073956 A US58073956 A US 58073956A US 2888769 A US2888769 A US 2888769A
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US
United States
Prior art keywords
choke
tube
gun
choke tube
sleeve
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 - Lifetime
Application number
US580739A
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English (en)
Inventor
Arne Y Grahn
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Individual
Original Assignee
Individual
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Filing date
Publication date
Priority to BE556934D priority Critical patent/BE556934A/xx
Application filed by Individual filed Critical Individual
Priority to US580739A priority patent/US2888769A/en
Priority to FR1174371D priority patent/FR1174371A/fr
Priority to DEP18422A priority patent/DE1094157B/de
Application granted granted Critical
Publication of US2888769A publication Critical patent/US2888769A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • This invention relatesto'a choke mechanism for firearms, and more particularly shotguns,.and relates especially to an automatically adjustable choke mechanism whereby adjustment is made in the amount of choking to whichzthebarrel is subjected in response tothe firing or-dis'charge of the gun.
  • Adjustable choke mechanisms forfirearms have long been: known and also automatically adjustable choke mechanismshave been'proposed, such mechanisms usually; comprising a split orslotted choke tube which is attached to the gun barrel and a relatively movablesleeve surrounding the choke tube and adapted to constrict it when moved upon the tube.
  • the arrangement is such thattheconstricting tube is moved in some manner in response to the firing of the gun so tha't automatic adjustment ofthe amount or-degree of choke will be effected.
  • An-t automatically adjustable choke mechanism has a distinctadvantage over a manually adjustabletype in that very; often a hunter will be able to getmore than oneshot at game after it has been flushed. Usually the first shot will-be made when the game is relatively close and no choking action or relatively little choking action is required. At the next shot the game will-beat a greater distance from-the gun andacloser pattern-will be desirable. The same istrue ifathird sh'ot is-secured.- If these adjustments fromone choking position to anoth'er may beautornatically eiiected-bythefiring-f the gun, the result describedabove may; be obtainedwhere it would not be possible to adjust the choke manually between the. consecutive discharges of the firearm without the gamegetting out of range.
  • Thediameter of the choke tube is substantially that of the gun barrel, and choking action is obtained by varying..the distanceof this tube from the muzzle end of the u
  • choking action is obtained by varying..the distanceof this tube from the muzzle end of the u
  • the choke tube is advanced a certain extent, say a half inch, a degree of choking action is obtained while, if the choke tube is further advanced so that its entrance end is, for example, substantially an inch from the muzzle end of the gun barrel, substantially a full choking'effect is obtained.
  • tube of constant bore which may be moved forwardly by discharge of the gun and which is releasably held in various adjusted positions so that itmoves forwardly in a step-by-step manner-one step at each discharge of the guna reliable and eflicient automaticaL 1y adjustable choking mechanism is obtained.
  • One object of the present invention is to providean automatically adjustable choke mechanism-which will be positive and reliable in operation and economical to manufacture.
  • A'further object of the invention is to' provide an automatically adjustable choke mechanism whereinra choketube of constant diameterthat is one which is not expansible or constrictable-will be mounted in front of the gun barrel for movement axially thereof, and the movement of the tube will be-effected in response todischarge of the gun.
  • Still another object of the invention is to provide achoke mechanism of the character described above wherein means will be provided for releasably holding the choke tube in adjusted positions'sothat it will-move for wardly in astep-by-step manner upon discharge of the gun.
  • a still further object of the invention is the provision of an automatically adjustable choke mechanism 'of'the character described-wherein the choke tube is moved in a 'stepby-step manner andspaced means are provided upon cooperating parts-of the mechanism to'prevent the tube from moving through-a distance of-"more than one step upon a single discharge otthe gun.
  • Fig. 1 is-aside elevational viewof the muzzleend of a gun barrel having theinvention applied thereto;
  • Fig. 2 is an'enlarged sectional view'on line 2-2 of Fig. 1, showing the choke mechanism in open bore position;
  • Fig. 3 is-a view similar to Fig. 2 showing the parts in full-choke position;
  • Fig. 5 is anelevationalview of the friction ring employedto' releasably holdthe choke tube inany given adjusted position.
  • the" muzzle end of a gun barrel lit-having secured thereto 'by brazing or equivalent means an adapter-'11. Adjacent the forward end thereof theadapter is provided-with external screw threads 12-and. a a cylindrical sleevermember- 13'- is provided with internal threads lid-adjacent its rear end so thatit may be threadedly secured to the adapter:
  • the internal diameter of the. sleeve 'or'cylinder member 13 is somewhat greater than the bore 15 of the gun barrel; and this member is provided with'an internalannular projection or rib 16 a shortdistance from its front end- Adjacent the front end of this member is an internal flange 17 having a rearwardl-y facing beveledsurface 18.
  • the arrangement is. such that an-annular recess- 19 is providedbetween the flange17 and the internal projection or rib 16 Slidably mounted -within-thesleeve member 13 is atubular choke.member20, this.--member, as indicated in Fig.
  • the -inner wall is flared as shown at 21 so as to provide a flaring or funnel-shaped portion to receive the charge of shot from the muzzle end of the gun, It will be appreciated that as the rear end of this choke tube isslightly spaced away a distance of of an inch or more, from the end of the gun barrel, the charge will probably expand slightly before it reaches the tube. 'This flaring portion 21 of the choke tube will recollect the shot and direct it into the portion of the tube of uniform diameter.
  • a split ring 23 Surrounding the choke tube 20 and located within the annular recess 19 is a split ring 23, the width of the ring being substantially that of the recess 19. This ring is held against appreciable movement in the recess by contact of its abrupt rear edge with the abrupt forward edge 24 of the rib 16. At its forward edge the ring 23 is beveled, as shown at 25, to cooperate with the beveled face 18 of the flange 17.
  • This split ring 23 fits with a suitable amount of friction about the outside diameter of the choke tube 20 and, as the ring is held against axial movement within the cylinder member 13, it will exert friction upon the tubular member to tend to inhibit relative movement between the choke tube and the cylinder member 13.
  • the ring 23 When the choke tube is moved forwardly by the discharge of the gun, as will be hereinafter referred to, there will be a tendency for the ring 23 to be moved forwardly and the contact of the beveled surface 25 of the ring with the beveled surface 18 of the flange 17 of the sleeve member 13 will tend to constrict the ring about the choke tube so as to exert the required friction upon the latter.
  • the choke tube not be moved through may be externally threaded, as shown at 35, and the outer sleeve may be internally threaded, as shown at 36, so that the latter may by rotation thereof be secured to the inner sleeve 13 and thus prevent movement of the choke tube upon discharge of the gun.
  • the choke mechanism will respond to the discharge of the gun and the choke tube will be adjustedforwardly in a step-bystep manner. If, for example, the gun is fired with the parts in position shown in Fig. 2, the effect of the discharge, probably due to the recollecting of the shot charge by the flared portion 21 of the choke tube 20, will impart forward motion to the latter and cause the'shoulder 29 of the forward internal groove of the sleeve 26 to jump past the ring 33.
  • the split ring 33 olfers a certain amount of frictional resistance to the movement of the choke tube with respectto the inner sleeve 13 but, as this is not usually suflicient, I prefer to provide the friction ring 23 in addition to the holding ring 33. It is possible, however, that the ring 33 may be employed to perform both the frictionally restraining function and the releasably holding function and that, therefore, both of these functions may be accomplished by the same means, and the invention is, therefore, not limited to separate means for both frictionally restraining the forward movement of the choke sleeve and releasably holding it in its various adjusted positions.
  • Indicia indicated at 34 may be provided upon the exterior portion of the inner sleeve 13 to indicate the position of the outer sleeve 26 and, therefore, the position of the choke tube so as to advise the user as to the particular adjustment of the choke tube at any time. While three adjustments or positions are shown in the drawing, it will groove, ride up the flaring surface 30 thereof, lodge against the shoulder 29 of this groove, and releasably hold the outer sleeve and choke tube in this position for the next discharge of the gun.
  • the choke tube 20 is provided adjacent its rear end with an external shoulder 38 which is adapted in the most forward position of the tube to abut the rear shoulder 39 of the rib 16 so as to prevent complete detachment of the parts if the gun is fired when the choke tube is in the position shown in Fig. 3.
  • the choke tube 20 may be made somewhat longer and more positions of adjustment obtained so that all ranges of choke usually found in the manually adjusted chokes would be covered.
  • a choke mechanism for attachment to the muzzle end of the barrel of a gun comprising an inner sleeve member adapted to be attached to the end of the barrel, a choke tube having a circumferentially continuous wall slidably mounted within said sleeve member, an outer sleeve member embracing the inner sleeve member and projecting beyond the latter and having its forward end secured to the forward end of the choke tube, cooperating interengaging means carried by said sleeve members releasably holding the outer member and choke tube in various adjusted positions axially of the inner sleeve member, and said choke tube having an internal bore substantially equal to the bore of the gun barrel for the greater part of its length but having a flaring portion adjacent its rear end.
  • a choke mechanism for attachment to the muzzle end of the barrel of a gun comprising an inner sleeve member adapted to be attached to the end of the barrel, a choke tube having a circumferentially continuous wall slidably mounted within said sleeve member, an outer sleeve member embracing the inner sleeve member and projecting beyond the latter and having its forward end secured to the forward end of the choke tube, cooperating interengaging means carried by said sleeve members releasably holding the outer member and choke tube in various adjusted positions axially of the inner sleeve member, said means comprising a split ring carried by one of said members and frictionally engaging the other thereof, and said other member being provided with spaced annular recesses in which a portion of said ring is received.
  • a choke mechanism for attachment to the muzzle end of the barrel of a gun comprising an inner sleeve member adapted to be attached to the end of the barrel, a choke tube having a circumferentially continuous wall slidably mounted within said sleeve member, an outer sleeve member embracing the inner sleeve member and projecting beyond the latter and having its forward end secured to the forward end of the choke tube, cooperating interengaging means carried by said sleeve members releasably holding the outer member and choke tube in various adjusted positions axially of the inner sleeve member, and a split ring member embracing the outer surface of the choke tube and disposed between it and the inner surface of the inner sleeve to frictionally restrain movement of the choke tube.
  • a choke mechanism for attachment to the muzzle end of the barrel of a gun comprising an inner sleeve member adapted to be attached to the end of the barrel, a choke tube having a circumferentially continuous wall slidably mounted within said sleeve member, an outer sleeve member embracing the inner sleeve member and projecting beyond the latter and having its forward end secured to the forward end of the choke tube, cooperating interengaging means carried by said sleeve members releasably holding the outer member and choke tube in various adjusted positions axially of the inner sleeve member, said means comprising a split ring carried by said inner sleeve and held against movement axially thereof, said outer sleeve having internal annular recesses to receive a portion of said ring, and additional means to frictionally restrain movement of said choke tube in the inner sleeve comprising a split ring embracing the choke tube, and the wall of said inner sleeve being provided with an internal annular rece
  • a choke mechanism for a shotgun or the like comprising an inner sleeve adapted to be secured to the muzzle end of the gun barrel, an outer sleeve slidably and telescopingly embracing the inner sleeve, means to hold said outer sleeve in various adjusted positions axially of the inner sleeve, and a choke tube secured at its forward end to the forward end of the outer sleeve and slidably received within the inner sleeve, said choke tube when in its innermost position within the inner sleeve extending to a point adjacent the muzzle end of the gun barrel, the Wall of said choke tube being circumferentially continuous and the bore thereof being substantially equal to that of the gun barrel for the greater part of its length but being flared outwardly adjacent its rear end.
  • a choke mechanism for attachment to the muzzle end of the barrel of a gun comprising an inner sleeve member adapted to be attached to the end of the barrel, a choke tube having a circumferentially continuous wall slidably mounted within said sleeve member, an outer sleeve member embracing the inner sleeve member and projecting beyond the latter and having its forward end secured to the forward end of the choke tube, and cooperating interengaging means carried by said sleeve members releasably holding the outer member and choke tube in various adjusted positions axially of the inner sleeve member.
  • An automatically actuated choke mechanism for attachment to the muzzle end of the barrel of a gun comprising a sleeve member adapted to be fixedly attached to the end of the barrel, an inexp-ansible choke tube slidably mounted within said sleeve member, means frictionally restraining movement of said choke tube relatively to the sleeve member and releasably holding it in various adjusted positions with respect to the sleeve member, said frictional restraining means comprising a member secured to said choke tube and extending over said sleeve and having a plurality of spaced recesses therein and means carried by said sleeve member and projecting therefrom to engage in said recesses, the outer wall of each of said recesses being inclined with respect to the axis of the tube.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Telescopes (AREA)
  • Toys (AREA)
US580739A 1956-04-26 1956-04-26 Choke mechanism for firearms Expired - Lifetime US2888769A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE556934D BE556934A (enrdf_load_stackoverflow) 1956-04-26
US580739A US2888769A (en) 1956-04-26 1956-04-26 Choke mechanism for firearms
FR1174371D FR1174371A (fr) 1956-04-26 1957-04-25 Mécanisme d'étranglement pour armes à feu
DEP18422A DE1094157B (de) 1956-04-26 1957-04-26 Choke-Einrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US580739A US2888769A (en) 1956-04-26 1956-04-26 Choke mechanism for firearms

Publications (1)

Publication Number Publication Date
US2888769A true US2888769A (en) 1959-06-02

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US580739A Expired - Lifetime US2888769A (en) 1956-04-26 1956-04-26 Choke mechanism for firearms

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US (1) US2888769A (enrdf_load_stackoverflow)
BE (1) BE556934A (enrdf_load_stackoverflow)
DE (1) DE1094157B (enrdf_load_stackoverflow)
FR (1) FR1174371A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2972829A (en) * 1958-03-27 1961-02-28 Poly Choke Company Inc Automatically adjustable choke for shotguns
FR2610714A1 (fr) * 1987-02-05 1988-08-12 Franchi Spa Luigi Fusil de chasse a canon de longueur variable
US10371477B1 (en) * 2018-06-13 2019-08-06 Terry Dobson, JR. Choke assembly for shotgun

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH499086A (de) * 1968-11-11 1970-11-15 Oerlikon Buehrle Ag Axiale Lagesicherung eines zylindrischen Teiles in einem hohlzylindrischen Teil, insbesondere für einen Treibladungskörper und einen Düsenkörper

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1892522A (en) * 1931-03-24 1932-12-27 Ezekiel F White Adjustable gun choke and method of constructing the same
US2428232A (en) * 1944-05-25 1947-09-30 Joseph J Limon Shotgun choke
US2484988A (en) * 1945-04-03 1949-10-18 Remington Arms Co Inc Means for controlling shot patterns
US2676429A (en) * 1948-09-24 1954-04-27 Herbert E Gotterson Automatic choke for firearms
US2779119A (en) * 1956-01-18 1957-01-29 George R Fawcett Automatically operated variable shotgun choke

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR384948A (enrdf_load_stackoverflow) * 1900-01-01
FR468883A (fr) * 1914-02-24 1914-07-18 Leon Couche Perfectionnements dans les canons de fusils de chasse
DE321148C (de) * 1914-04-25 1920-05-21 C Th Stockey Schrotschusslenker
AT111319B (de) * 1925-01-27 1928-11-26 Josef Dr Socin Schrotschußwaffe.
DE552409C (de) * 1929-08-14 1932-06-14 Richard M Cutts Jr Vorsatzstueck fuer Schrotflinten
FR899669A (fr) * 1943-07-12 1945-06-07 Arme à choke amovible
FR912871A (fr) * 1945-03-05 1946-08-22 Procédé de fabrication du choke de canon des armes, particulièrement des armes de chasse
FR931233A (fr) * 1946-07-24 1948-02-17 Embout choke-bore pour fusil de chasse et fusil perfectionné en vue de son utilisation
FR995090A (fr) * 1949-07-20 1951-11-27 Système de choke réglable pour fusil de chasse à double canon
FR1097499A (fr) * 1954-03-24 1955-07-06 Dispositif permettant l'angementation du cercle de dispersion des plombs de chasse; adaptable instantanément sur canon

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1892522A (en) * 1931-03-24 1932-12-27 Ezekiel F White Adjustable gun choke and method of constructing the same
US2428232A (en) * 1944-05-25 1947-09-30 Joseph J Limon Shotgun choke
US2484988A (en) * 1945-04-03 1949-10-18 Remington Arms Co Inc Means for controlling shot patterns
US2676429A (en) * 1948-09-24 1954-04-27 Herbert E Gotterson Automatic choke for firearms
US2779119A (en) * 1956-01-18 1957-01-29 George R Fawcett Automatically operated variable shotgun choke

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2972829A (en) * 1958-03-27 1961-02-28 Poly Choke Company Inc Automatically adjustable choke for shotguns
FR2610714A1 (fr) * 1987-02-05 1988-08-12 Franchi Spa Luigi Fusil de chasse a canon de longueur variable
US10371477B1 (en) * 2018-06-13 2019-08-06 Terry Dobson, JR. Choke assembly for shotgun

Also Published As

Publication number Publication date
FR1174371A (fr) 1959-03-10
BE556934A (enrdf_load_stackoverflow)
DE1094157B (de) 1960-12-01

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