US987543A

US987543A - Trigger mechanism for automatic firearms.

Info

Publication number: US987543A
Application number: US54429410A
Authority: US
Inventors: Hugo Borchardt
Original assignee: Individual
Current assignee: Individual
Priority date: 1910-02-16
Filing date: 1910-02-16
Publication date: 1911-03-21
Anticipated expiration: 1928-03-21

Description

H. BORCHARDT.

TRIGGER MECHANISM FOR AUTOMATIC FIREARMS.

APPLIOATION FILED IEB. 16,1910.

Patented Mar. 21, 1911.

4 SHEETS-SKEET l.

WITNESSES H. BORGHARDT.

TRIGGER MECHANISM FOR AUTOMATIC FIREARMS.

APPLICATION FILED r1111. 16, 1910.

987,543. Patented Mar-.21, 1911.

4 SHEBTSSHEET 2.

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g M, hBj flftm aeJ Jr H. BORGHARDT.

TRIGGER MECHANISM FOR AUTOMATIC mums.

APPLIOATION FILED FEB.16,1910

Patented Mar. 21, 1911.

4 SHEBTSSHEET 3.

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H. BORGHARDT.

TRIGGER MECHANISM FOR AUTOMATIG FIREARMS.

APPLICATION FILED FEB. 16,1910.

Patented Mar. 21, 1911.

4 SHEETS-SHEET 4.

INVEN TOR: I i itgv (fiWT/un w) TNES SE81 HUGO BORCHABDT,OF CHARLOTTENBURG, GERMANY.

TRIGGER MECHANISM FOR AUTOMATIC FIREARMS.

Specification of Letters Patent.

Patented Mar. 21, 1911.

Application filed February 16, 1910. Serial No. 544,294.

To all whom it may concern:

Be it known that I, HUGO BoRoHARoT, engineer, a citizen of the United States of America, residing at No. 31 Kantstrasse, Charlottenburg, near Berlin, in the Kingdom of Prussia, Germany, have invented certain new and useful Improvements Relating to Trigger Mechanism for'Automatic Firearms, of which the following is a full, clear, and exact description.

This invention relates to a trigger mechanism for automatic self-loading fire-arms.

According to the invention the trigger rod or sear is not only rotatable but also longitudinally displaceable resiliently relatively to its point of rotation in order that when the breech returns after firing and the trigger is still pressed the trigger rod or sear may be able to yield and return to its engaged position when the breech moves forward.

The invention is illustrated in the accompanying drawin s in which the constructional principle se forth above is shown embodied in a trigger mechanism of the Borcha-rdt automatic pistol.

In the accompanying drawings: Figure 1 shows the loaded weapon before firing, that is to say with breech closed, the firing pin cocked and the trigger in its normal position. Figs. 2 to 4 show the mechanism in, the position which it occupies in Fig. 1, to a larger scale and in side elevation, horizontal longitudinal section and vertical cross section respectively. Figs. 5 and 6 show the mechanism in side elevation and in horizon.- tal cross section, when the trigger has been pressed, that is to say at the point when the pressure is applied, but firing has not actually taken place and the firing pin has not been released. In Figs. 7 and 8 the weapon is shown after having been fired; that is to say the firing pin has been released and the breech block has moved rearward under the action of the recoil.

The application of the invention here illustrated is based upon the general construction of the trigger mechanism which was described in applicants German Patent No. 75837. The trigger sear is here a twoarmed lever i rockably mounted at the side of the breech casing, the rear end of this lever projecting into the path of the nose 1.! of the firing pin (Z under the influence of a leaf spring '5 in such manner that when the breech block moves forward the nose d comes behind the rear end of the lever which is situated in its path, as clearly shown in Fig. 3. On its front end the trigger sear is provided with a resiliently mounted pin 2" upon which the nose '1 on the dog 9 connected with the trigger g or integral therewith acts upon firing.

Now in accordance with the invention the trigger sear i is spring-controlled and longitudinally displaoeable on its pivot i owing to the fact that the eye in the lever in which the pivot engages is elongated and that the rear end of the lever which is recessed, as shown, is provided with a spiral spring i arranged therein which bears against a head which closes the recess at the rear, and also against a pin i Which'extends through the rear lever arm into the eye in the lever, its front end bearing against the ivot i". In the cooked or engaged position Fig. 3), the trigger sear i is kept pressed forward in opposition to the pressure of the said spring 71 so that the pivot 2' bears against the rear wall of the eye and the spring pin i against the inner inclined pressure face of the trigger nose Q1. After the trigger has been pressed, the weapon fired, and the breech piece has sprung back into its rearward position, the trigger sear will be the position shown in Fig. 8. Owing to the fact that the rear end of the lever has been re leased from the nose al the spring i which was previously compressed'is able to extend. In this extension of the spring the sear experiences a rearward longitudinal displace- Went on i vot 4 that it passes from the position Sit n in 'i ig. into the osition shown in Fig. 8. In this position Fig. 8) the pivot 2' bears against the front wall of the eye in the sear; the spring pin 2' is free of the nose 9 while the rear end of the sear 6 extends inwardly into the path of the nosed of the firing pin d so as to engage it as soon as the breech moves forwardly to close. When this occurs the operation is reversed; the nose d coming behind the end of the sear or lever again presses the sear 2' forward in opposition to the pressure of the spring 2' so that it leaves the position shown in Fig. 3 in which the spring pin 2' is situated within reach of the trigger nose behind its oblique pressure face. Even should pressure on the trigger be maintained, this forward movement of the sear 2' upon its I pivot is able to take place unimpeded; in

such a case'when the sear is pressed forward by the nose d, the pin '5 will merely be caused to come in front of the rear face of the trigger nose g and be pressed back into its recess in the front end of the sear. Now as soon as the trigger is released and the trigger and tri ger nose return to initial position, the pin a is again able to move forwardly and will then adjust itself immediately in the pressure position (Fig. 3) so that firing can take place at once. Consequently wh le, when pressure is maintained upon the trigger the weapon cannot be tired so that unintentional firing is entirely prevented in such circumstances (that is to say when the trigger is being pressed), firing can always be again effected as soon as the trigger. and consequently the trigger nose 9 have been released for a moment so as to permit of their return to initial position.

The method of mounting the trigger here illustrated should be noted, as it enables the pressure point to be adjusted in the simplest possible manner. The trigger dog (1' which carries the trigger nose Q1 is suspended upon two pivots with play in such a manner as to be movable in opposite directions; when the trigger is pressed to the pressure point the trigger first of all rocks about the rear and nearer of these two pivots 9 so that when the pressure point position shown in Figs. 5 and 6 is reached, both pivots g and g bear upward in the pivot holes in the trigger. When the trigger is further pressed the more distant front pivot constitutes the axis of rotation until finally the trigger reaches the end position shown in Figs. 7 and 8 in which the rear pivot is free downward and upward in its pivot eye.

What I claim as my invention and desire to secure by Letters Patent of the United States is:

1. In an automatic fire-arm the combination of a barrel, a breech to close the barrel, automatic means to operate the breech, a

vfiring pin, a nose on said pin, trigger mechanism comprising a trigger a pivotal and longitudinally displaceable sear, a pivot for said sear, an elongated eye in said sear in which said pivot engages, a spring-pressed pin bearing on said pivot, a spring pressed pin mounted in said sear adapted to operatively engage with the trigger, and means whereby said sear engages with the nose on said firing pin during closure of the breech and whereby said sear is displaced longitudinally during such closure.

2. In a fire-arm, a barrel, firing means cooperating with trigger mechanism to discharge the fire-arm, said trigger mechanism including a trigger, a dog connected to said trigger, a plurality of elongated eyes in said dog, a plurality of pivots one for each eye at unequal distances from said triger whereby said pivots come consecutively into operation when pressure is applied to the trigger.

3. In an automatic fire-arm the combination of a barrel, a breech to close the barrel, automatic means to operate the breech, firing means cooperating with trigger mechanism to discharge the fire-arm, said trigger mechanism including a trigger, a do connected to said trigger, a plurality o elongated eyes in said dog, a plurality of pivots one for each eye at unequal distances from said trigger whereby said pivots come consecutively into operation when pressure is applied to the trigger.

4. In an automatic fire-arm the combination of a barrel, a breech to close the barrel, automatic means to operate the breech, firing means cooperating with trigger mechanism to discharge the fire-arm, said trigger mechanism including a trigger, a dog connected to said trigger, a plurality of elongated eyes in said dog, a plurality of pivots one for each eye at unequal distances from said trigger whereby said pivots come consecutively into operation when pressure is applied to the trigger, a trigger sear or rod adapted to be controlled by and to engage with said trigger to engage with the firing means during closure of the breech and to be released therefrom to discharge the weapon, and means whereby said sear may engage with the firing means during closure of the breech irrespective of the position of the trigger.

5. In an automatic fire-arm the combination of a barrel, a breech to close the barrel, automatic means to operate the breech, firing means cooperating with trigger mechanism to discharge the fire-arm, said trigger mechanism including a trigger, a dog connected to said trigger, a plurality of elongated eyes in said dog, a plurality of pivots one for each eye at unequal distances from said tri ger whereby said pivots come consecutive y into operation when pressure is applied to the trigger, a trigger sear or red adapted to be controlled by and to engage with said trigger, to engage with the firing means during closure of the breech, and to be released therefrom to discharge the weapon, and means whereby said sear may engage with the firing means during closure of the breech, while pressure is applied to the trigger, and means whereby said sear may engage with said trigger when the trigger is released.

6. In an automatic firearm the combination of a barrel, a breech to close the barrel, automatic means to operate the'breech, a firing pin, a nose on said pin, trigger mechanism, said trigger mechanism including a trigger, a dog connected to said trigger, a plurality of elongated eyes in said dog, a plurality of pivots one for each eye at unequal'distances from said trigger whereby said pivots come consecutively into operation when pressure is applied to the trigger, a rotatable and longitudinal displacement sear, a pivot for said sear, an elongated eye in said sear in which said pivot engages, a

spring pressed pin bearing on said pivot, a spring pressed pin mounted in said sear adapted to operatively engage with the trigger, and means whereby said sear engages with the nose on said firing pin during HUGO BORCHARDT.

Witnesses HENRY HAsPER, WOLDEMAR HAUIT.