US2864194A - Manually and automatically adjustable choke for shotguns - Google Patents

Manually and automatically adjustable choke for shotguns Download PDF

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Publication number
US2864194A
US2864194A US684583A US68458357A US2864194A US 2864194 A US2864194 A US 2864194A US 684583 A US684583 A US 684583A US 68458357 A US68458357 A US 68458357A US 2864194 A US2864194 A US 2864194A
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US
United States
Prior art keywords
choke
tube
gun
track
tubular
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
US684583A
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English (en)
Inventor
Arne Y Grahn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Poly Choke Co Inc
Original Assignee
Poly Choke Co Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BE571196D priority Critical patent/BE571196A/xx
Application filed by Poly Choke Co Inc filed Critical Poly Choke Co Inc
Priority to US684583A priority patent/US2864194A/en
Priority to FR774723A priority patent/FR1249816A/fr
Application granted granted Critical
Publication of US2864194A publication Critical patent/US2864194A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F41A21/42—Chokes for shotguns, e.g. automatic chokes manually adjustable

Definitions

  • This invention relates to a choke mechanism for firearms and especially shotguns, and relates more particularly to an automatically adjustable choke mechanism in which the adjustment of the choke is effected by the firing or discharge of the gun.
  • the choke is also manually adjustable.
  • Adjustable choke mechanisms for firearms have long been known and automatically adjustable choke mechanisms have been proposed, such mechanisms usually comprising a split or slotted choke tube which is attached to the gun barrel, and a relatively movable sleeve surrounding the choke tube and adapted to constrict it when moved upon the tube.
  • the arrangement is such that the constricting sleeve is moved in some manner in response to the firing of the gun so that automatic adjustment of the amount or degree of choke is effected.
  • An automatically adjustable choke mechanism has a distinct advantage over a manually adjustable type in that very often a hunter will be able to get more than one shot at game after it has been flushed, that is, the hunter will be able to fire more rapidly owing to the automatic adjustment of the choke mechanism.
  • the first shot is made when the game is relatively close and no choking action or relatively little choking action is required.
  • the game is usually at a greater distance from the gun and a closer pattern of shot is, therefore, desirable.
  • a third shot can be fired before the game is out of range. If these successively closer patterns may be effected by the choke mechanism in response to the firing of the gun more shots may be obtained at game where it would not be possible to adjust the choke manually between the consecutive discharges of the firearm without the game getting out of range.
  • adjustable choke mechanisms usually comprise a slotted or constrictable tube and a relatively movable outer sleeve to effect restriction of the tube.
  • an effective choking action is obtained by means of an inexpansible choke tube which is of constant diameter, that is to say, that the cylindrical wall of the tube is not interrupted by slots.
  • the tube in the present instance, is of substantially uniform diameter except adjacent its rear end where it receives the charge of shot from the muzzle of the gun barrel.
  • the diameter of the choke tube is substantially that of the gun barrel, and choking action is obtained by varying the distance of this tube from the nozzle of the barrel.
  • One object of the invention is to provide an improved automatically adjustable choke mechanism which very effectively chokes a shotgun and which is very reliable in operation.
  • a further object is to provide an automatically adjustable choke mechanism in which the choke tube is rotated to an extent each time the firearm is discharged, the tube being rotated in first one direction and then the other.
  • Still another object of the invention is to provide a choke mechanism having improved means for releasably holding the choke tube in various adjusted positions sothat it moves forwardly in a step-by-step manner, and in which means is also provided for manually locking the tube in various adjusted positions.
  • Fig. l is a side elevational view of the muzzle of a gun barrel having a choke embodying the invention ap plied thereto;
  • Fig. 3 is a view similar to Fig. 2 showing the parts in an intermediate choke position
  • Fig. 4 is a view similar to Fig. 3 but showing the parts in full-choke position
  • Fig. 5 is a sectional view taken on line 5-5 of Fig. 2;
  • Fig. 6 is a sectional view taken on line 66 of Fig. 2; and
  • Fig. 7 is a fragmentary view illustrating a development of the choke tube.
  • the muzzle of a gun barrel 10 having secured thereto by brazing, or equivalent means, an adapter 11. Adjacent the forward end thereof the adapter 11 is provided with external screw threads for mounting a cylindrical member 12 having internal threads at the rear end thereof so that it may be threadedly secured to the adapter.
  • the automatic operation of the choke mechanism is as follows. When the parts of the choke mechanism are in the open-bore position of Fig. 2 and the stop pin 25 is located in the track in the broken-line (see Fig. 7) position indicated at 30, subsequent discharge of the gun effects movement of the stop pin 25 relatively to the may expand slightly before it reaches the member 18. i
  • a split ring 29 embraces the choke member 13 and extends into the internal annular recess 16 formed in the cylindrical member 12, the width of the ring being substantially that of the recess.
  • the ring 20 is held against appreciable movement inthe recess by contact of its abrupt rear edge with the abrupt forwardly facing shoulder 17, and by contact of the rearwardly facing and beveled shoulder cooperating with the forward and beveled edge 21 of the ring.
  • the split ring 28 fits, with a suitable amount of friction, about. the outside diameter of the tubular member 13 and, as the ring is held against axial movement within the cylindrical member 12, it inhibits relative movement between the latter and the choke member.
  • the members 18 and 23, when secured together, may be referred to as the choke tube.
  • the choke tube or the cylindrical member 12 is provided with a fixed stop member.
  • the stop member, indicated at 25, is provided on the cylindrical member 12 and cooperates with a track which, in this instance, is formed, not on the sleeve member 23 as it might be, but on the tubular choke member 18, the track being indicated at 26.
  • the fixed stop member 25 is formed by a radially inwardly extending headed pin at the forward extremity of. the cylindrical member 12 and received in the side wall struc-- ture thereof.
  • the track 26 is generally of zigzag or V shape (see Fig.
  • the stop pin 25 Due at leastin part to the momentum of the rotarymovement of the choke tube the stop pin 25 travels down one arm of the V-shaped track but does not travel along the other arm of the track until the gun is discharged a second time. It will be understood that when the stop pin 25 comes to rest in the last-mentioned position the choke tube is in the intermediate position of Fig. 3 and subsequentdischarge of the gun effects further move.- ment of the stop pin 25 relatively to the track 26 so that the pin 25 travels along said other arm of the V-shaped track' 26 coming to rest in the broken-line position (see Fig. 7) indicated at 32. As the pin travels along the track 26 to. the last-mentioned position thereof, the choke tube is rotated in the other direction.
  • a third shot may be fired in this position of the choke parts and it will be understood that when the parts are in this, the full-choke, position (Fig. 4)- further choking action is prevented by engagement of the stop pin 25 with the inner terminalof the track 26.
  • the choke tube is moved from the open-bore position of Fig. 2 to the full-choke position of Fig. 4 in a step-by-step manner and it will befurther understood that, if desired, additional outward adjustments of the choke tube may be effected by providing a longer zigzag track for the stop pin 25 instead of a V-shaped track.
  • the outer surface of the cylindrical member 12 may be provided with indicia cooperating with the rear edge of sleeve 23 to give a visual indication of the, degree of choke.
  • the choke tube may be manually adjusted and may be locked in either the open-bore or intermediate choke positions. This may be done by manipulation of the sleeve member 23. For example, when the stop pin 25 is in the open-bore position 30 indicated in Fig. 7, the sleeve member 23; may be grasped and rotated to move the pin 25 relatively to the choke tube so that the pin enters and engages in the extension 28 of the track. When the stop pin 25 is in the last-mentioned position, the choke tube is effectively held against axial movement when the gun is subsequently fired. When the choke mechanism is in the open-bore position rearward movement of the choke tube is prevented by engagement of the flange 24 with the front end of the cylindrical member 12.
  • the choke tube When it is'desired" to lock the pin 25 in the intermediate choke position, the choke tube may be rotatedto move the pin 25 relatively to the'choke tube so that the pin moves from the position 31 shown in Fig. 7 to a position in the extension 29, of the track. It will be understood thatwhen the pin 25 is engaged in the extension 29 subsequent discharge of the gun does not etfect outward movement of the choke'tube. As shown in Fig. 7, the extension 29' is slightly offset from'the' matic adjustment, that is, when the pin 25 is in the positi'on 30, indicated in Fig. 7, prior to discharge of the gun.
  • the choking effect of the mechanism in any given position thereof will vary in accordance with the diameter of the tubular member 18, and that while the member 18 is indicated in the drawings to be of substantially the same diameter as the bore 13 of the gun barrel, the internal diameter of the tubular member 18 at the forward end thereof may be somewhat greater or less than the diameter of the bore 13, if desired.
  • the choke mechanism resides in the provision of the pin and track means constituting the releasable lock for holding the choke tube in its automatically adjusted positions.
  • the pin and track means reduces friction in the releasable lock to a minimum.
  • the releasable locking means for holding the choke tube in either its manually or automatically adjusted positions is interposed between the fixed cylindrical member and the inner choke member, the locking means acting directly on the latter. Still further, it will be understood that owing to the provision of the track on the outer surface of the inner choke member the entrance of dirt or other foreign matter into the track is effectively inhibited.
  • a choke mechanism for a gun barrel comprising a hollow cylindrical member extending forwardly from the muzzle of the gun barrel in fixed relation thereto, a choke member comprising a tubular charge-choking element extending into and slidable in said cylindrical member for forward propulsion by impact on said element of a charge fired from the gun, and cooperating interengaging means on said members for effecting a step-by-step forward movement of the tubular element on discharge of the gun, said mean comprising a zigzag track on one of the members cooperating with a stop element fixed to the other member and relatively movable along the track, so that the choke member is rotated in first one direction and then the other as it is advanced.
  • a choke mechanism for a gun barrel comprising a hollow cylindrical member extending forwardly from the muzzle of the gun barrel in fixed relation thereto, a choke member comprising a charge-choking tubular element extending into and forwardly slidable insaid member, for forward propulsion by impact on said element of a charge fired from the gun, the choke member having a sleeve element embracing the cylindrical member and rigid with the tubular element at the forward end of the latter so as to be slidable therewith, one of said elements having a zigzag track formed thereon and facing the cylindrical member, said cylindrical member having a stop pin fixed thereto and relatively movable along the track, so that the tubular element is rotated in first one direction and then the other as it is advanced, for effecting a step-by-step movement of the tubular element on discharge of the gun.
  • a choke mechanism for a gun barrel comprising a fixed element having a tubular part extending forwardly from the muzzle of the gun barrel, a choke tube having a first and charge-choking tubular part extending into and forwardly slidable in said part of the fixed element, for forward propulsion by impact thereon of a charge fired from the gun, said choke tube having a second tubular part embracing said part of the fixed element and rigid with said first tubular part at the forward end of the latter so as to be slidable therewith, and cooperating interengaging means between one of said tubular parts of the choke tube and said tubular part of the fixed element, for effecting a step-by-step forward movement of the choke tube on discharge of the gun, said means comprising a stop element fixed on one of the two last-mentioned tubular parts and a zigzag track on the other, the stop element being relatively movable along the track so that the choke tube is rotated in first one direction and then the other as it is advanced.
  • a choke mechanism for a gun barrel comprising a fixed member having a cylindrical part extending forwardly from the muzzle of the gun barrel, a choke tube having a charge-choking tubular part extending into and forwardly slidable in the cylindrical part, for forward propulsion by impact on said tubular part of a charge fired from the gun, and cooperating interengaging means on said member and choke tube to restrain forward movement of the tubular part and to rotate the latter first in one direction and then the other so that the tubular part is advanced in a step-by-step manner.
  • a choke mechanism for a gun barrel comprising a fixed member having a cylindrical part extending forwardly from the muzzle of the gun barrel, a choke tube having a charge-choking tubular part extending into and forwardly slidable in the cylindrical part, for forward propulsion by impact on said tubular part of a charge fired from the gun, and cooperating interengaging means on said member and choke tube to restrain forward movement of the tubular part and to rotate the latter first in one direction and then the other so that the tubular part is advanced in a step-by-step manner, said means acting directly on said tubular part.
  • a choke mechanism for a gun barrel comprising a fixed member having a cylindrical part extending forwardly from the muzzle of the gun barrel, a choke tube having a charge-choking tubular part extending into and forwardly slidable in the cylindrical part, for forward propulsion by impact on said tubular part of a charge fired from the gun, and cooperating interengaging means on said member and choke tube to restrain forward movement of the tubular part and to rotate the latter first in one direction and then the other so that the tubular part is advanced in a step-by-step manner, said means acting directly on said tubular part and comprising a V-shaped track on one of said parts cooperating with a stop pin fixed to the other part.
  • a choke mechanism comprising a cylindrical member adapted to be secured to the muzzle of a gun barrel, a choke tube comprising a charge-choking tubular member extending into and forwardly slidable in the cylindrical member, for forward propulsion by impact on T said tubular member of a charge fired from the gun, the choke tube having a sleeve member embracing the cylindrical member and rigid with the forward end of the tubular member so as to be carried thereby, and cooperating interengaging means on the cylindrical member and the choke tube providing various positions in which the choke tube may be, manually and selectively locked against propulsion by discharge of the gun, and also providing for self-propulsion of the tube through a rotary movement of the latter in a step-bystep manner.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
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US684583A 1957-09-17 1957-09-17 Manually and automatically adjustable choke for shotguns Expired - Lifetime US2864194A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE571196D BE571196A (US07922777-20110412-C00004.png) 1957-09-17
US684583A US2864194A (en) 1957-09-17 1957-09-17 Manually and automatically adjustable choke for shotguns
FR774723A FR1249816A (fr) 1957-09-17 1958-09-16 Mécanisme d'étranglement pour armes à feu et spécialement pour fusils de chasse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US684583A US2864194A (en) 1957-09-17 1957-09-17 Manually and automatically adjustable choke for shotguns

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US2864194A true US2864194A (en) 1958-12-16

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US (1) US2864194A (US07922777-20110412-C00004.png)
BE (1) BE571196A (US07922777-20110412-C00004.png)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2937465A (en) * 1958-12-29 1960-05-24 Louis M Denaux Automatic choke attachment for shotguns
FR2610714A1 (fr) * 1987-02-05 1988-08-12 Franchi Spa Luigi Fusil de chasse a canon de longueur variable
US20140096426A1 (en) * 2012-10-04 2014-04-10 Browning Firearm choke tube

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2270592A (en) * 1938-06-02 1942-01-20 James H Kitzmiller Automatic choke for gun barrels
US2428232A (en) * 1944-05-25 1947-09-30 Joseph J Limon Shotgun choke
US2731754A (en) * 1950-02-23 1956-01-24 Clyde M Gibson Adjustable choke for double barreled shotguns
US2759286A (en) * 1953-06-22 1956-08-21 Thomas S Moore Choke attachment for guns

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2270592A (en) * 1938-06-02 1942-01-20 James H Kitzmiller Automatic choke for gun barrels
US2428232A (en) * 1944-05-25 1947-09-30 Joseph J Limon Shotgun choke
US2731754A (en) * 1950-02-23 1956-01-24 Clyde M Gibson Adjustable choke for double barreled shotguns
US2759286A (en) * 1953-06-22 1956-08-21 Thomas S Moore Choke attachment for guns

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2937465A (en) * 1958-12-29 1960-05-24 Louis M Denaux Automatic choke attachment for shotguns
FR2610714A1 (fr) * 1987-02-05 1988-08-12 Franchi Spa Luigi Fusil de chasse a canon de longueur variable
US20140096426A1 (en) * 2012-10-04 2014-04-10 Browning Firearm choke tube
US8978286B2 (en) * 2012-10-04 2015-03-17 Browning Firearm choke tube
US9297600B1 (en) * 2012-10-04 2016-03-29 Browning Firearm choke tube

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BE571196A (US07922777-20110412-C00004.png)

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