US2251174A - Sear mechanism - Google Patents

Sear mechanism Download PDF

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Publication number
US2251174A
US2251174A US136079A US13607937A US2251174A US 2251174 A US2251174 A US 2251174A US 136079 A US136079 A US 136079A US 13607937 A US13607937 A US 13607937A US 2251174 A US2251174 A US 2251174A
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US
United States
Prior art keywords
pawl
trigger
hammer
spring
fork
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
US136079A
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English (en)
Inventor
Sosso Giulio
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2251174A publication Critical patent/US2251174A/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
    • F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
    • F41A19/42—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer
    • F41A19/43—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer in bolt-action guns
    • F41A19/47—Cocking mechanisms
    • F41A19/48—Double-action mechanisms, i.e. the cocking being effected during the first part of the trigger pull movement
    • 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
    • F41A17/64—Firing-pin safeties, i.e. means for preventing movement of slidably- mounted strikers
    • F41A17/72—Firing-pin safeties, i.e. means for preventing movement of slidably- mounted strikers trigger-operated, i.e. the movement of the trigger bringing a firing-pin safety into inoperative position during the firing
    • 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
    • F41A19/42—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer
    • F41A19/43—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer in bolt-action guns
    • 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
    • F41A19/42—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer
    • F41A19/43—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer in bolt-action guns
    • F41A19/44—Sear arrangements therefor
    • F41A19/45—Sear arrangements therefor for catching the hammer after each shot, i.e. in single-shot or semi-automatic firing mode

Definitions

  • This invention relates generally to sear mechanism comprising a trigger and pawl for automatic fire arms, more particularly automatic pistols, and it has for its object certain improvements relating to the sear and trigger mechanism, the most important of such improvements consisting in providing means to permit recock ing of the hammer by pulling the trigger.
  • Figures 1 and 2 show partly in section the weapon with the trigger and hammer in their released position, and partly drawn-back trigger and cooked hammer ready for firing.
  • Figure 3 shows the weapon directly after firing and before it takes the position shown in Figure 2.
  • Figure 4 shows diagrammatically the auto-- matic safety device.
  • the frame I of the weapon comprises the half 2, trigger guard and the chamber for the magazine, which in the example shown is of the curved endless belt type according to my copending application Ser. No. 82,695 filed on June 1, 1936.
  • the breech bolt 3 is slidably fitted in the frame and extends to the further end of the barrel 4 contained in the breech bolt.
  • the barrel is guided in front in the bush 5 mounted by a bayonet joint in the breech bolt and rests at its rear end on a larger cross pin 6 in the frame by means of the breech l of the barrel, engaging by means of two teeth after the manner of a rack with a set of teeth on the pin 6.
  • a sleeve 8 is fitted on the barrel and is held against the breech l by means of the spring 9 stretched between the breech 'l and bush 5.
  • the sleeve 8 is provided with two cross bolts 8a pressed in a direction opposite to the pressure of the spring 9 on the sleeve by a fork ii pivoted to the frame at Illa.
  • the hammer H is pivoted to the back of the frame at Ila.
  • the hammer is connected to the fork ID by means of the link I2, so that on oscillation of either of them in one direction, the other oscillates in the opposite direction.
  • a tooth l5 having an abutment I5a is articulated to the fork.
  • the pin t which is operatively connected with the barrel through the teeth on the breech l, is further operatively connected with the breech bolt 3 by means of an arm 11, shown in dotted lines in Figures 1 to 3, which is solidly fixed to the pin 6 and engages into a recess in the breech bolt.
  • the barrel and breech bolt are thereby operatively connectedtogether, and as the barrel recoils by a small extent, by reason of the engagement of the sets of teeth it rocks the arm H which pushes the breech bolt backwardly compressing the spring 9 by the proper extent for introducing the fresh bullet into the barrel and cooking the hammer.
  • the extractor I8 is pivoted as usual to the breech bolt by its extensions [8a and retains the striker l9 which is provided with a damping spring 2%].
  • the weapon is provided with an automatic safety device maintaining the striker locked until the trigger is drawn back.
  • This safety device consists of a cross member 22 ( Figure 4) pushed by a spring 23 into the path of the striker for looking it.
  • the cross member is formed at its end remote from the spring with an incline 22a along which the push rod l l may slide under the action of the trigger as the latter is depressed ( Figures 2 and 3), moving the cross member against the action of the spring 23.
  • the cross member has a notch 22! which in the depressed position of the trigger comes underneath the striker permitting movement thereof.
  • the weapon is loaded as usual by pulling the breech bolt which has a milled rear end.
  • is provided in the frame and has a knob ZI'a and nose Zlb which is engaged by a mortise 3' in the breech bolt and holds the latter in its backward position for easy inspection of the weapon.
  • the weapon is ready for firing, but the striker is as yet locked by the cross member 22 because the spring I6 still pushes the trigger I3 forward.
  • the trigger I3 When after such releasing of the hammer by hand, the trigger I3 is pulled, the tip of pawl I4 abuts the shoulder or abutment I511 or pawl I5.
  • the fork or sear member ID On further movement of the trigger, the fork or sear member ID is oscillated and thus the hammer is re-cocked through the link l2.
  • the pawl I5 oscillates on its pivot on the fork I0 and after the hammer has been re-cocked the pawl tip, during the further movement of the trigger, is disengaged from the shoulder I5a.
  • the fork is therefore free to oscillate backwards under the action of the spring 9, thus oscillating the hammer forward and firing the shot.
  • the main spring 9 is shown extended, the hammer II is on the breech bolt, the pawl l5 has passed over the abutment I51), the trigger has been returned outwards into the normal inoperative position pushed by the spring I5 and the end of the pawl I4 is in engagement with the notch i511 of pawl I5.
  • this operation can be effected in two different ways. For example, if the firearm has not yet been loaded, that is to say if the cartridge has not yet been introduced into the barrel, the breech bolt is pulled back by hand. Through thismovement, the breech bolt, on striking the hammer, carries it into the cooked position and compresses, by means of the link, the main spring 9 and at the same time, by the anticlockwise oscillation of the fork sear member ID, the pawl I5 is brought behind the abutment I512 assisted in this movement by the spring I6. On the return movement the breech bolt introduces the cartridge into the barrel; during this movement the hammer is locked by engagement of pawl I5 on the abutment I5b.
  • the fork sear member I0 which is no longer retained by the trigger, by a snapping movement produced by the extension of the main spring 9, effects a clockwise rotation causing the hammer II to snap on the striker I 9 for firing.
  • the pawl I5 due to the sliding of the end of pawl I' l on the surface above its oscillation pin, cannot effect a clockwise rotation and therefore passes over the abutment and allows the hammer to perform its stroke.
  • the parts are returned into the position shown in Figure 4, that is to say the pawl I4 is returned by the spring I6 into the notch I5a.
  • Sear mechanism for pistols comprising a frame, a movable hammer on the frame capable of being cocked, a barrel, a main spring surrounding a barrel, a fork sear member journaled on the frame and coacting with said main spring, a link connecting the hammer to the fork sear member, so that when the hammer oscillates in the cooking direction, the fork sear member oscillates in the opposite direction to compress the main spring, a pawl journaled on the fork sear member and adapted to engage an abut- 1 ment on said frame when the hammer is brought into the cocking position and the main spring is compressed, a trigger, a second pawl journaled on said trigger, a second spring mounted on said trigger and acting on the second pawl to press its free end against the upper face of the first pa'w'l, the latter having an abutment oacting with said second pawl to bring the hammer into the cocked position and compress the main spring

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US136079A 1936-04-14 1937-04-10 Sear mechanism Expired - Lifetime US2251174A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2251174X 1936-04-14

Publications (1)

Publication Number Publication Date
US2251174A true US2251174A (en) 1941-07-29

Family

ID=32071266

Family Applications (1)

Application Number Title Priority Date Filing Date
US136079A Expired - Lifetime US2251174A (en) 1936-04-14 1937-04-10 Sear mechanism

Country Status (4)

Country Link
US (1) US2251174A (fr)
BE (1) BE421074A (fr)
DE (1) DE707202C (fr)
FR (1) FR820512A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2461574A (en) * 1944-01-31 1949-02-15 Leslie A Skinner Firing mechanism
US4539889A (en) * 1981-04-30 1985-09-10 Gaston Glock Automatic pistol with counteracting spring control mechanism

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2461574A (en) * 1944-01-31 1949-02-15 Leslie A Skinner Firing mechanism
US4539889A (en) * 1981-04-30 1985-09-10 Gaston Glock Automatic pistol with counteracting spring control mechanism

Also Published As

Publication number Publication date
FR820512A (fr) 1937-11-13
BE421074A (fr) 1937-05-31
DE707202C (de) 1941-06-18

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