EP0034476A2 - Dispositif de percussion pour arme à feu à culasse rotative - Google Patents

Dispositif de percussion pour arme à feu à culasse rotative Download PDF

Info

Publication number
EP0034476A2
EP0034476A2 EP81300590A EP81300590A EP0034476A2 EP 0034476 A2 EP0034476 A2 EP 0034476A2 EP 81300590 A EP81300590 A EP 81300590A EP 81300590 A EP81300590 A EP 81300590A EP 0034476 A2 EP0034476 A2 EP 0034476A2
Authority
EP
European Patent Office
Prior art keywords
bolt
firing pin
forward movement
carrier
abutment
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.)
Ceased
Application number
EP81300590A
Other languages
German (de)
English (en)
Other versions
EP0034476A3 (fr
Inventor
Jack Leroy Kast
Albert Richard Eddy
Merle Francis Carter
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.)
Remington Arms Co LLC
Original Assignee
Remington Arms Co LLC
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 Remington Arms Co LLC filed Critical Remington Arms Co LLC
Publication of EP0034476A2 publication Critical patent/EP0034476A2/fr
Publication of EP0034476A3 publication Critical patent/EP0034476A3/fr
Ceased legal-status Critical Current

Links

Images

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
    • F41A17/00—Safety arrangements, e.g. safeties
    • F41A17/64—Firing-pin safeties, i.e. means for preventing movement of slidably- mounted strikers
    • F41A17/66—Firing-pin safeties, i.e. means for preventing movement of slidably- mounted strikers automatically operated, i.e. operated by breech opening or closing movement

Definitions

  • This invention relates to a firing pin block that prevents a firearm from being discharged with its bolt in an unlocked position. More particularly, it relates to a firing pin block for a firearm of the type in which a breech bolt has locking lugs and is rotatable between a position locked to the barrel and an unlocked position, this rotation being imparted by cam means drivingly connecting the bolt with a reciprocating bolt carrier.
  • the firing pin is restrained by its retaining pin from protruding from the bolt face far enough to fire a cartridge.
  • the forward momentum of the firing pin is absorbed in part by impact against its retaining pin. This may sooner or later distort the parts enough to interfere with proper operation of the firearm. In an extreme case, distortion may cause the firing pin to jam with its tip protruding from the bolt face. Further, the block is inoperative if the retaining pin is broken or missing.
  • Patent 3,397,473 to Browning Another prior-art design of interest is shown by Patent 3,397,473 to Browning, in which, in common with the present invention, cam means rotate the bolt as a result of sliding motion of the carrier.
  • cam means rotate the bolt as a result of sliding motion of the carrier.
  • forward motion of the firing pin relative to the bolt is limited only by its engagement with the bolt, or with a retaining pin mounted in the bolt. Therefore, the firing pin is not positively blocked against protrusion from the bolt face when the bolt is unlocked, but is merely biased rearwardly by the firing pin spring.
  • Benson discloses a bolt-action rifle in which a lug on the firing pin is engageable by a cam on the bolt handle; when the handle is raised to unlock the bolt, the cam retracts the firing pin behind the bolt face.
  • Robinson is an example of a hammerless bolt-action rifle in which a firing pin is cocked rearwardly by a cam on the bolt when its handle is raised, and positively held by the cam in this retracted position until the handle is lowered to lock the bolt.
  • a further object is to insure positive operation of the block even if the firing pin spring and retaining pin have been distorted, have failed, or are missing altogether.
  • Another object is to provide a simple, economical firing pin block for rotary-bolt firearms that does not require any separate parts, in addition to a bolt, bolt carrier, firing pin, and cam means drivingly connecting the bolt and bolt carrier, that can be omitted or lost in assembly.
  • the firing pin block of the present invention can serve as the sole means to prevent firing of a rotary-bolt firearm when the bolt is unlocked. It is preferred to use the system as a fail- safe device, in conjunction with other, conventional means for preventing firing when the bolt is open.
  • the assignee of the present invention has for some years made firearms having a trigger disconnector (which may be integrated with an action bar lock in slide-action models) to prevent firing when the breech bolt is open. Examples of these devices are shown in U. S.
  • the present firing pin block incorporates an enlarged head or abutment formed on the firing pin, which is engageable with the rear end of the bolt carrier slide to block the firing pin from any forward protrusion beyond the bolt face until locking lugs formed on the breech bolt are at least partially, and preferably fully, locked into complementary lugs on the barrel or barrel extension.
  • the blocking action is achieved by coordination of the relative longitudinal movements of the bolt carrier and bolt with the operation of cam means which drivingly connect them to produce rotary locking movement of the bolt after it has closed on the barrel breech, and the carrier continues to slide forwardly.
  • the degree of lock-up that must be attained before firing becomes possible can be changed by varying these relationships, although it is highly preferable to delay removing the blockage until after the locking lugs are fully engaged and the bolt is completely locked.
  • the improved firing pin block has an additional advantage in that it mechanically retracts the firing pin to a position behind the bolt face as the bolt is opened after firing. The firing pin is thus retracted to a safe position even if the firing pin spring or retaining pin are broken, distorted, or missing.
  • the present invention is equally applicable to manual slide- operated firearms and gas-operated semiautomatic firearms of the type having a rotary bolt. Since the fire control system and'the reloading system of the firearm are not directly concerned with the firing pin block of this invention, and may be of various designs well known in the art, these systems have been omitted from the drawings. Reference is made to the aforementioned U. S. Patents 2,685,754 and 2,675,638 for typical examples of firearms to which the present invention might be applied.
  • FIGURES 1 and 2 show a firearm having a barrel 12 formed with a cartridge-receiving chamber 18.
  • a barrel extension 14 is threaded on the barrel at 13, and is formed with a series of conventional circumferentially-spaced locking lugs 16.
  • the barrel extension is attached by a bolt 19 to a forward portion 21 of a receiver 20, which has a socket 23 at its rear end for mounting a shoulder stock (not shown).
  • An action bar assembly 22 is reciproca bl y slidable in the receiver, and extends forwardly for attachment to conventional manual or gas operating means (not shown) located at the fore-end of the firearm.
  • the action bars 22 are interconnected at their rear ends by an integral U-shaped yoke 24, which fits into a recess 27 in a bolt carrier slide 28 to provide a fixed connection therewith.
  • a resilient plastic ring 53 maintains correct lateral alignment between the yoke 24 and slide 28.
  • a breech bolt 30 is slidably and rotatably received in a bore 29 in the bolt carrier 28.
  • the bolt has an axial bore 32, in which a firing pin 34 is reciprocably slidable between a retracted position shown in FIG. 1, in which its tip 35 is withdrawn behind the bolt face 36, and an extended position in which the tip protrudes from the bolt face, as shown at 35" in FIG. 6, to fire a cartridge (not shown) received in the chamber 18.
  • the firing pin is biased rearwardly by a compression spring 54 received in the bore 32 and bearing against shoulders 56 and 58, respectively formed in the bolt and on the firing pin.
  • the firing pin is secured by a retaining pin 60, extending transversely through a cylindrical shank portion 42 at the rear of the bolt, and cooperating with a flat 62 milled on the firing pin to limit rearward movement of the firing pin relative to the bolt.
  • Forward movement of the firing pin relative to the bolt is limited by engagement of the shank 42 with an enlarged circular head or abutment 48 formed on the firing pin. (See FIG. 7).
  • the distance that the firing pin tip 35 protrudes from the bolt face 36 is critical to proper functioning of the firearm. Control of this dimension in the manufacture of the improved firearm is greatly facilitated by the fact that the engaging surfaces of the shank 42 and abutment 48 are flat, and parallel to the bolt face 36.
  • the bolt 30 is formed on its exterior cylindrical surface with a pair of similarly-shaped circumferentially-spaced cam slots 52, of which only one appears in the drawings. These cam slots cooperate with a pair of cam pins 50 secured in the bolt carrier 28 to produce rotation of the bolt when it is moved axially relative to the bolt carrier.
  • cam pins 50 secured in the bolt carrier 28 to produce rotation of the bolt when it is moved axially relative to the bolt carrier.
  • One of these cam pins may comprise the inner end of a manual bolt-operating handle (not shown), if desired.
  • the bolt In the positions of the bolt carrier shown in FIG. 1 and 3, the bolt is rotated to an unlocked position, in which it protrudes forwardly from the bolt carrier, by movement of the cam pins 50 to the rear ends of the slots 52.
  • the bolt has a series of circumferentially-spaced locking lugs 40 around its outer surface; as shown in FIG. 2, these lugs are aligned to enter freely between the lugs 16 of the barrel extension 14 as the bolt is moved forwardly by the action bars 22 and bolt carrier 28 between the positions of FIGS. 1 and 3.
  • This angular alignment is maintained during this forward movement by a rectilinear channel 33 formed in the top of the receiver 20, and extending parallel to the longitudinal axis of the bolt, for receiving and guiding one of the lugs 40.
  • the carrier 28, which is guided for rectilinear reciprocation primarily by the action bars 22 riding on rails 25 formed in the side walls of the receiver 20, also has a guide lug 41 that is slidably received in the channel 33.
  • the rearwardly-extending tubular shank portion 42 of the bolt is slidably received in a bore 44 formed in a rearward extension 46 of the carrier 28.
  • the enlarged head or abutment 48 engages the carrier extension 46 to prevent forward movement of the firing pin 34, in the relative positions of the parts shown in FIGS. 1 and 3.
  • the bolt 30 is shown in FIG. 1 protruding forwardly from the carrier 28 to the maximum extent, as defined by engagement of the cam pins 50 with the rear ends of the cam tracks 52. This protruding relationship is maintained, as the carrier moves the bolt forwardly, by the lug 40 sliding in the channel 33.
  • the maximum retraction of the bolt into the carrier, as shown in FIG. 7, is defined by the cam pins 50 engaging the forward ends of the cam tracks 52, after these cam means have rotated the bolt to its locked position.
  • a hammer 66 is pivotally mounted on a pin 68 secured in the receiver 20, and is rotatable clockwise, when released by a suitable trigger and fire control mechanism (not shown) from a cocked position shown in FIG. 1 to a firing position shown in FIG. 7, in which it impacts the rear end of the firing pin to discharge the firearm.
  • a box magazine 70 is mounted in the receiver in a conventional fashion to supply a series of cartridges, each of which is fed successively into the chamber 18 by a forward movement of the bolt 30.
  • the clockwise rotation of the hammer 66 is limited by its engagement with the magazine 70, as shown in FIG. 7, and the firing pin is driven forwardly by the momentum of hammer impact imparted to it prior to this engagement.
  • the bolt carrier 28 and action bars 22 are shown moving forward, in the direction shown by the arrow.
  • the bolt has passed over the magazine 70, where it could have picked up a cartridge (not shown), and its forward stroke has been terminated by abutment against the barrel 12, in which position it would have seated the cartridge in the chamber 18.
  • the bolt lugs 40 have passed freely between the barrel lugs 16, have left the receiver channel 33, and have entered a cylindrical recess 17 in the barrel extension 14, so that the bolt is now free to rotate. However, no bolt rotation has yet occurred, since the cam pins 50 have not yet been moved by the forward travel of the bolt carrier 28 from the rear ends of the cam tracks 52.
  • the action bars 22 have carried the bolt carrier 28 far enough forward relative to the bolt 30, which can travel no farther, to cause the pins 50 to traverse the curved portions and enter into the longitudinal portions of the cam slots 52, and at the same time to move forward a distance L relative to the bolt.
  • This distance is slightly more than sufficient to rotate the bolt and engage the bolt lugs 40 behind the barrel lugs 16, as shown in FIG. 5, to lock the bolt to the barrel extension 14.
  • the firing pin 34 being pressed rearwardly by its spring 54 against the retaining pin 60 in the bolt, begins to protrude rearwardly from the carrier extension 46 at the same time as the carrier 28 commences to move forward from the FIG. 3 position toward that of FIG. 4.
  • the carrier 28 consequently reaches a position in FIG. 4 such that the gap between the head 48 of the firing pin and the carrier extension 46 is equal to L, the same distance that the cam pins 50 have moved forwardly in the bolt 30.
  • the parts are so dimensioned that the distance between the tip 35 of the firing pin and the bolt face 36 is also equal to L.
  • the carrier extension lies a distance I behind the bolt shank 42. Additional forward movement of the carrier 28 through the distance I is illustrated in FIG. 6. If the hammer is released at this stage, it will drive the firing pin forward the distance L + I, causing the head to reach a position 48" abutting against the bolt shank 42, and the tip to reach a position 35" protruding the distance I beyond the bolt face 36. This is the maximum depth to which a cartridge primer can be indented by the forward momentum of the firing pin.
  • the cam tracks 52 have straight lost-motion sections extending forwardly from their curved sections at dwell distance D, as appears in FIGS. 4 and 6, to allow not only the incremental forward movement I of the carrier 28 and action bars 22, but also some additional movement into their extreme forward positions shown in FIG. 7.
  • the weapon may be fired by releasing the hammer, which strikes the head of the firing pin as it reaches a position 66", in which it is halted by contact the magazine 70.
  • the momentum imparted to the firing pin 34 compresses the spring 54, and drives the firing pin forwardly until its head strikes the bolt shank 42 at the position 48", and its tip projects from the bolt face at the position 35" to discharge the firearm,
  • FIG. 8 illustrates the initiation of subsequent movements of the parts to reopen the breech and recock the hammer.
  • the action bars 22 are driven to the rear, as shown by the arrow, by either manual or gas operation as the case may be. This initially retracts only the bolt carrier 28, as its attached cam pins 50 pass through the straight lost-motion portions of the cam slots 52. Then the cam pins pass into the curved portions of the cam slots, rotating the bolt 30 to the unlocked position of FIG. 2.
  • the cams pins 50 at the rear ends of the slots 52 the rearward movement of the action bars and bolt carrier is imparted to the bolt 30 as well.
  • the rearward extension 46 of the bolt carrier 28 is made even longer than is necessary to ensure that the bolt lugs 40 must be fully locked to the barrel lugs 16 before the firing pin tip 35 can be made to protrude from the bolt face 36 to discharge the weapon.
  • This provides a margin of extra safety in the event that the parts, particularly the enlarged firing pin head or abutment 48 and the extension 46, might become worn or distorted.
  • This aspect of the invention can be more clearly understood by analyzing the dimensional relationships of the parts in somewhat greater detail.
  • the length of the firing pin 34 is equal to the length of the bolt 30 plus the maximum cartridge indent distance I, which is reached by the tip upon contact of the abutment with the bolt shank 42.
  • the extension 46 is of such a length that after the bolt carrier has moved forwardly from the position of FIG. 1 to that of FIG. 3 to close the bolt against the breech of the barrel 12, it holds the abutment 48 at a distance L + I to the rear of the bolt shank 42, and consequently holds the firing pin tip at a distance L to the rear of the bolt face 36.
  • Movement of the bolt carrier farther forward a distance L, to the position of FIG. 4, causes the cam pins 50 to pass through the curved portions of the cam tracks 52, whose longitudinal. length defines the distance L, and rotates the bolt to lock it to the barrel.
  • the carrier extension 46 still lies to the rear of the shank 42 a distance I, so that the abutment 48 can travel forwardly no more than the distance L, only enough to bring the tip 35 flush with the bolt face.
  • Still further forward travel of the bolt carrier through the distance I, to the position of FIG. 6, is necessary to remove the block against contact between the abutment 48 and the shank 42.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Coating Apparatus (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Dowels (AREA)
EP81300590A 1980-02-14 1981-02-13 Dispositif de percussion pour arme à feu à culasse rotative Ceased EP0034476A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12143780A 1980-02-14 1980-02-14
US121437 1980-02-14

Publications (2)

Publication Number Publication Date
EP0034476A2 true EP0034476A2 (fr) 1981-08-26
EP0034476A3 EP0034476A3 (fr) 1982-05-12

Family

ID=22396728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81300590A Ceased EP0034476A3 (fr) 1980-02-14 1981-02-13 Dispositif de percussion pour arme à feu à culasse rotative

Country Status (5)

Country Link
EP (1) EP0034476A3 (fr)
AU (1) AU6724281A (fr)
CA (1) CA1145984A (fr)
ES (1) ES499445A0 (fr)
NO (1) NO810493L (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675638A (en) * 1951-01-06 1954-04-20 Remington Arms Co Inc Fire control for firearms
BE514121A (fr) * 1951-09-12
US2926446A (en) * 1958-03-31 1960-03-01 Mossberg & Sons O F Firearm firing mechanism
US2976637A (en) * 1958-10-27 1961-03-28 Marlin Firearms Co Sear safety actuated by rotation of bolt
US3397473A (en) * 1967-01-03 1968-08-20 Browning Ind Inc Cartridge extractor and extractor spring therefor
US3690218A (en) * 1967-07-31 1972-09-12 Bernard Maillard Breech mechanism for automatic or semi-automatic guns
CH517283A (de) * 1969-12-19 1971-12-31 Oerlikon Buehrle Ag Selbsttätige Feuerwaffe

Also Published As

Publication number Publication date
ES8206836A1 (es) 1982-08-16
ES499445A0 (es) 1982-08-16
NO810493L (no) 1981-08-17
EP0034476A3 (fr) 1982-05-12
CA1145984A (fr) 1983-05-10
AU6724281A (en) 1981-08-20

Similar Documents

Publication Publication Date Title
US4389919A (en) Firing pin block for firearm with a rotary breech bolt
EP0034475B1 (fr) Dispositif de percussion pour arme à feu avec culasse à glissement longitudinal
US3776096A (en) Gas operated firearm
US5502914A (en) Striker cocking and firing mechanism for a handgun
US5235763A (en) Key-actuated safety for handgun
US4015512A (en) Gas-operated firearm
EP0163912B1 (fr) Dispositif de sûreté pour fusil à répétition
CA2290025C (fr) Mecanisme d'ejection de cartouches pour pistolet automatique modifie
US3996684A (en) Bolt latch
US4123963A (en) Firearm and caseless ammunition therefor
US3090148A (en) Bolt action firearm with charger
US4769936A (en) Firearm safety
EP0386084A1 (fr) Dispositif d'auto-deverrouillage pour canon et support de fermeture de culasse a recul dans un fusil semi-automatique.
US2894346A (en) Firing mechanism with a single spring for the hammer, hammer catch means and trigger
EP1106955B1 (fr) Arme à feu avec percuteur inertial
RU2138001C1 (ru) Полуавтоматический пистолет
US3713241A (en) Striker assembly for firearms
EP0034476A2 (fr) Dispositif de percussion pour arme à feu à culasse rotative
RU2138756C1 (ru) Самозарядный пистолет
US3471961A (en) Bolt and firing mechanism for bolt action type firearm
US2742822A (en) Firing mechanism for automatic and semi-automatic firearms
EP0665944A1 (fr) Mecanisme a culasse cylindrique pour fusil a repetition
US4894939A (en) Safety for fire arms
RU2246676C1 (ru) Запирающий механизм
US3938423A (en) Recoil operated firearm with unitary barrel and breech bolt lock member

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR IT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): BE DE FR IT SE

17P Request for examination filed

Effective date: 19821015

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19841207

RIN1 Information on inventor provided before grant (corrected)

Inventor name: EDDY, ALBERT RICHARD

Inventor name: KAST, JACK LEROY

Inventor name: CARTER, MERLE FRANCIS