GB821871A - An improvement in trigger mechanism for firearms - Google Patents

An improvement in trigger mechanism for firearms

Info

Publication number
GB821871A
GB821871A GB38187/56A GB3818756A GB821871A GB 821871 A GB821871 A GB 821871A GB 38187/56 A GB38187/56 A GB 38187/56A GB 3818756 A GB3818756 A GB 3818756A GB 821871 A GB821871 A GB 821871A
Authority
GB
United Kingdom
Prior art keywords
sear
trigger
block
breech
heel
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
Application number
GB38187/56A
Inventor
Horace Kennerley-Tayler
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.)
Minister of Supply In Her Majesty S Government
Original Assignee
Minister of Supply In Her Majesty S Government
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
Application filed by Minister of Supply In Her Majesty S Government filed Critical Minister of Supply In Her Majesty S Government
Priority to GB38187/56A priority Critical patent/GB821871A/en
Priority to US702101A priority patent/US2909100A/en
Publication of GB821871A publication Critical patent/GB821871A/en
Expired legal-status Critical Current

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
    • F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
    • F41A19/25—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins
    • F41A19/27—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block
    • F41A19/29—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block propelled by a spring under tension
    • F41A19/30—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block propelled by a spring under tension in bolt-action guns
    • F41A19/33—Arrangements for the selection of automatic or semi-automatic fire
    • 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
    • F41A17/00—Safety arrangements, e.g. safeties
    • F41A17/56—Sear safeties, i.e. means for rendering ineffective an intermediate lever transmitting trigger movement to firing pin, hammer, bolt or sear

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Emergency Lowering Means (AREA)

Abstract

821,871. Firearms. MINISTER OF SUPPLY. Nov. 28, 1957 [Dec. 14, 1956] No. 38187/56,. Classes 92 and 119 A trigger mechanism for automatic firearms comprises a .trigger 1 on a pivot 4, a sear 12 mounted on a pivot 13 so as to have both rotational and translational motion, pressure loading means which tends to move the sear away from the trigger and into the path of a breech-block 14, which itself can move the sear translationally against the said pressure loading means and a-movable change-fire cam 25 that at one setting restrains movement of the sear to prevent the gun from firing, at the second setting permits the trigger to operate the sear for single shot firing and at a third setting orients the sear to permit automatic fire. The pressure loading means comprises a spring 20 housed in a recess in the sear and a plunger 21 whose free end engages a recess 22 in the lower trigger heel 3. The sear has a pair of parallel legs 17 spaced on either side of a shoulder surface 18. The change-fire cam 25 encloses a spring 29 and a bevel-nosed plunger 30 that co-operate with grooves 32 and 33 in a trigger stop-block 31. The change-fire cam is set in position by an external thumb-lever 23 (Fig. 5 not shown) outside the side plates in which the trigger mechanism is 'housed. In the "safe" position shown in Fig. 1 the change lever is rotated until an arm 26 on it contacts a back stop 36 and. the sear plunger 21, acting on the lower trigger heel 3 causes the sear 9 to be moved translationally so that the sear axis pin 13 is against the forward end of the slot 11. The sear is disengaged from the trigger and is held in contact with a gun casing stop face 16 by contact between the sear legs 17 which press against the lugs 28 on the change lever. Thus the trigger does not operate the sear and even if the breech-block 14 is put into its rearward cocked position so that the sear is moved . forward some distance by it to re-engage the upper trigger heel 2 the sear still cannot disengage the breech-block because of the abutment between the lugs 17 and the change lever lugs 28. In the "repeat" or "single shot" position shown in Fig. 2 the plunger 30 on the change lever is retained in the groove 33 and the change lever itself is freed from contact with the sear 9. The breech-block 14 which is retained behind the sear head 10 pushes the sear toe 12 into engagement with a heel 2 of the trigger 1. When the trigger is pulled the trigger heel 2 rotates the sear and moves its head 10 from the path of the breech-block for firing. The sear then moves rearward over its axis pin 13 and rotates to re-erect the sear head 10 to retain the breech block again on recoil. Fig. 4 shows the position of the mechanism for "automatic" fire. The shoulder 27 of the change-fire cam 25 contacts the shoulder 18 on the sear so that the sear head 10 is withdrawn from the path of breech block by rotation of the trigger heel 2 against the sear toe 12 so long as the trigger is pressed.
GB38187/56A 1956-12-14 1956-12-14 An improvement in trigger mechanism for firearms Expired GB821871A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB38187/56A GB821871A (en) 1956-12-14 1956-12-14 An improvement in trigger mechanism for firearms
US702101A US2909100A (en) 1956-12-14 1957-12-11 Trigger mechanism for firearms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB38187/56A GB821871A (en) 1956-12-14 1956-12-14 An improvement in trigger mechanism for firearms

Publications (1)

Publication Number Publication Date
GB821871A true GB821871A (en) 1959-10-14

Family

ID=10401809

Family Applications (1)

Application Number Title Priority Date Filing Date
GB38187/56A Expired GB821871A (en) 1956-12-14 1956-12-14 An improvement in trigger mechanism for firearms

Country Status (2)

Country Link
US (1) US2909100A (en)
GB (1) GB821871A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1252563B (en) * 1964-05-15 1967-10-19 Star, Bonifacio Echeverria, S.A., Eibar, Guipuzcoa (Spanien) Trigger device for automatic weapons

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE567242A (en) * 1957-04-30
US3089391A (en) * 1961-09-22 1963-05-14 Edmond J Raleigh Combination actuator and detent device for guns
US3236154A (en) * 1963-06-28 1966-02-22 Howa Machinery Ltd Mechanism for reducing the rate of fire in automatic firing arms
US3290993A (en) * 1964-06-23 1966-12-13 Star Bonifacio Echeverria S A Release mechanism for automatic firearms
US5052141A (en) * 1990-08-10 1991-10-01 Sammons Hal C Trigger tension adjuster
US5705763A (en) * 1996-07-18 1998-01-06 Leon; Jorge A. Fire selector system for selecting between automatic and semi-automatic operation of a gun
US9631886B2 (en) * 2015-09-30 2017-04-25 Smith & Wesson Corp. Sprung drop pendulum

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2249231A (en) * 1937-04-19 1941-07-15 John B Smith Trigger mechanism
NL78116C (en) * 1942-08-17
US2539447A (en) * 1946-10-04 1951-01-30 John L Lochhead Selector for automatic firearms
CH297884A (en) * 1951-04-17 1954-04-15 Gevarm Societe A Responsabilit Automatic rifle.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1252563B (en) * 1964-05-15 1967-10-19 Star, Bonifacio Echeverria, S.A., Eibar, Guipuzcoa (Spanien) Trigger device for automatic weapons

Also Published As

Publication number Publication date
US2909100A (en) 1959-10-20

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