PATENT SPECIFICATION DRAWINGS ATTACHED 892,960 Date of filing Complete Specification Sept. /I, 1959. Application Date June 11, 1958. No. 18599/58. Complete Specification Published Apri/4, /962. Index at acceptance:-Class 119, A4(BlG:ClG). International Classification: -F07b, k. COMPLETE SPECIFICATION Improvements relating to Trigger Mechanism of Rifles, Pistols and like Firearms I, MARIAN KAROL JuREK, a British Subject, of 10/11, St. Mary's Row, Birmingham 4, do hereby declare the invention, for which I pray that a patent may be granted to me, 5 and the method by which it is to be per- formed, to be particularly described in and by the following statement:- This invention relates to trigger mechan- ism of rifles, pistols and like fire atms, such 10 trigger mechanism being of the type in which upon the cocking of the firearm a pivoted cocking sear is moved into a position in which a part thereof is obstructed by the trigger lever so as to hold the hammer at 15 full or half cock until released by the actua- tion of the trigger lever. The primary object of the present invention is to provide a trigger mechanism which is of a very simple construction, inexpensive to 20 manufacture and sensitive in operation. According to the present invention, in a trigger mechanism of the above type, the inner arm of the trigger lever is provided with spaced branches between which there 25 is provided a trigger seat pivoted indepen- dently of the trigger and biased by a spring away from one branch towards the other branch so as to hold the seat cocked, the latter branch serving to release the said 30 sear when the trigger is actuated. In order that the invention may be thoroughly understood two forms of con- struction of trigger mechanism according to the invention ate illustrated, by way of 35 example, on the accompanying drawing, wherein:- Fig. 1 illustrates in sectional elevation a trigger mechanism according to the first form of construction, the cocking piece of the bolt 40 being shown held in the cocked position by the trigger mechanism. Fig. 2 illustrates the trigger mechanism [Price 4s. 6d.] seen in Fig. 1 after the operation of the trigger. Fig. 3 is an elevation of a modified fotm 45 of construction of trigger mechanism. As will be observed in the drawing with reference to Figs. 1 and 2, the trigger mechanism suitable for rifles, pistols and like firearms comprises a body 4 which is 50 generally fiat and elongated. This body is machined with a recess 5, in which the trigger mechanism is accommodated. A trigger 6 depends from the recess 5, and the mechanism to be described is enclosed by a 55 cover plate (not shown) for which purpose the body is drilled and tapped at four posi- tions 7 for reception of screws which fasten the cover plate to the body 4 in a dust- proof manner. The trigger is a part of a 60 lever 8 pivotally mounted at 9 on a generally horizontal axis in the recess 5; the inner arm 10 of the lever 8 comprises two oppo- sitely directed branches 12, 13 having be- tween them a recess 11 in which a trigger 65 sear 14 is pivotally mounted at 15 on a generally horizontal axis and independently of the trigger. The trigger seat 14 is formed with a boss 16 which is freely mounted on the axis 15, and the arm of the seat 14: 70 extends radially from said boss and is dis- posed between the branches 12 and 13. One side of the sear 14 is biased by a spring 17 located in a socket in the branch 13 thereby to bias the seat 14 against the tip 15 18 of the inwardly curved branch 12. The free end of the sear 14 lies in the path of the free end of a bent 19 which is pivoted on a generally horizontal axis 20 and urged by a spring 21 into engagement 80 with a cocking piece 22 of a bolt. It will be observed that the trigger sear 14 biased by its spring 17 is urged into the path of the free end of the bent 19, so that when a firearm incorporating the trigger 90 WWW.RIFLEMAN.ORG.UK2 892,960 mechanism is cocked the bent 19 is blocked by the trigger sear 14. Thus, when the latter is turned in the direction of the arrow 23, Fig. 2 in response to the operation of 5 the trigger 6, the bent 19 turns about its axis 20, as indicated by the arrow 24, thus releasing the cocking piece 22 as indicated in Fig. 2. The trigger sear 14 has a sensi- tive operation under the control of the 10 branches 12, 13, the latter being longer than the former t."''us providing the outer branch 13 with a greater leverage than the inner branch 12. In considering the releasing operation of the mechanism, it will be ob- 15 se~·ved that the tip of the branch 12 operates against the adjacent surface of the sear 14, and the radial movement transmitted to the sear 14 in one direction, removes the block- ing action on the bent 19 and permits of 20 the position of release, Fig. 2, to be attained. The operational movement of the trigger lever 8 is controlled by an adjustable stop 25 screwed endwise in the body 4. A further adjusting screw 26 limits the movement of 25 the branch 12 in the cocking position of the mechanism. Normally, the spring loaded branch 13, forces without additional means, the trigger sear 14 into engagement with the tip of the other branch 12 which acts as a 30 stop, when the sear is in the cocking posi- tion. According to the modification illustrated in Fig. 3 the essential elements of construction seen in Figs. 1 and 2 are embodied therein. As will be observed, the inwardly curved 35 arm 12 which operates on the trigger sear 14 has its tip formed with two noses 27, 28 of which -the former is s"et in advance of the other, these noses 27, 28 being adapted to coact sequentially with the adjoin~ 40 ing surface of the trigger sear 14, in order that an initial and secondary pull can be exerted on the sear 14, thereby providing a very sensitive action. WHAT I CLAIM IS:- 45 1. A trigger mechanism of the type r·eferr·ed to, wherein the inner arm of the trigger lever is provided with spaced branches between which there is provided a trigger sear pivoted independently of the trigger and biased by 50 a spring away from one branch towards the other branch so as to hold the sear cocked, the latter branch serving to release the said sear when the trigger is actuated. 2. A trigger mechanism according to Claim 55 1, wherein the branches of the trigger lever differ in length. 3. A trigger mechanism for firearms con- structed substantially as described with reference to Figs. 1 and 2 or Fig. 3 of the 60 accompanying drawings. For the Applicant: GEORGE FUERY & CO., Chartered Patent Agents, Newhall Chambers, 8, Newhall Street, Birmingham, 3. PROVISIONAL SPECIFICATION Improvements relating to Trigger Mechanism of Rifles, Pistols and like Firearms I, MARIAN KAROL JuREK, a British Subject, of 10/11, St. Mary's Row, Birmingham 4, do hereby declare this invention to be des~ 65 cribed in the following statement :- This invention relates to trigger mechan- ism of rifles, pistols and like :firearms, such trigger mechan1sm being of the type in which upon the cocking of the firearm a pivoted 70" cocking sear is moved into a position in which a part thereof is obstructed by the trigger lever so as to hold the hammer at full or half cock until released by the pulling of the trigger lever. 75 The primary object of the present inven- tion is to provide a trigger mechanism which is very sfrnple, inexpensive and sensitive. According to the present invention, in a trigger mechanism of the above type, the 80 inner arm of the trigger lever is provided with spaced branches between which there is provided a pivoted trigger sear which is biased in a predetermined direction by the one branch so as to hold the main sear 85 cocked, and is limited in the other direction by the other branch, the latter branch when the trigger is operated serving to overcome the said bias and to release the said trigger sear. According to one form of construction of 90 the trigger mechanism, the inner arm of the trigger lever is provided with two oppositely and outwardly directed branches having be- tween them a recess in which there is a trigger sear consisting of an axially bored 95 boss freely mounted on a pivot pin, said boss having a radial arm which is disposed be- tween the said branches. One side of sai::l arm is biased by a spring on the one branch which urges the said arm against the other 100 branch. In this way, the trigger sear is normally biased so that it is urged into the path of the main sear so that when the firearm is cocked, and consequently the main sear is depressed towards the trigger, the 105 said main sear is blocked by the said trigger sear until the latter is turned in the opposite direction by operation of the trigger: One branch (the outer branch) is longer than the other (the inner branch) so that the lever-110 age of the one arm of the trigger is greater than that of the other. Therefore, the spring loaded branch forces, without addi- WWW.RIFLEMAN.ORG.UK892,960 3 tional means, the trigger sear into engage- ment with the other branch which acts as a stop, when the main sear is in the cock- ing position. 5 According to details of construction, the rearward movement of the shorter branch is controlled by an adjusting screw and the forward movement of the longer branch is also controlled by an adjusting screw so as 10 to limit movements in both directions of the trigger lever. The longer branch of the trigger lever may be biased by an auxiliary spring to increase the tension of the trigger lever. According to a modification of the trigger 15 lever, the shorter branch thereof may be provided with two noses, of which one is set in advance of the other, to coact with the arm of the trigger sear, in order that a double pull may be exerted on the sear 20 arm. For the Applicant: GEORGE FUERY & CO., Chartered Patent Agents, Newhall Chambers, 8, Newhall Street, Birmingham, 3. Leamington Spa: Printed for Her Majesty's Stationery Office by the Courier Press.-1962. Published at The Patent Office, 25, S"uthampton Buildings, London, W.C.2, from which copies may be obtaine{ll WWW.RIFLEMAN.ORG.UK'9 892,960 COMPLETE SPECIFICATION I SHEET This drawing is a reproduction of the Original on a reduced scale. 11 16 WWW.RIFLEMAN.ORG.UKNext >