US2156191A

US2156191A - Firearm

Info

Publication number: US2156191A
Application number: US236328A
Authority: US
Inventors: Ralph H Pike
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-10-07
Filing date: 1938-10-21
Publication date: 1939-04-25
Anticipated expiration: 1956-04-25

Description

R. H. PIKE April 25, 1939.

FIREARM Filed. odt. 21, 1938 w 7 Z x m a Z if H 5 ATTORNEYS WITNESS Patented Apr. 25, 1939 UN H E D 5 earner F-F'l -CE[ Ralph H. Pike. lr'alrspelr, Mont.

Application octane-r 21, 193's, Serial N01. 236328 1. Claim. (01. 42-69) This inventionrelates" to=flrearms and moreparticularly to a trigger spring tensioning' deviceof the type described in my application for patent entitled 'Firearm, filed January 4,- 1938,- Serial No.

183,375, Patent No. 2,143,028; January 10;- 1939'.

An object of thisinvention-isto provide a selfsetting trigger which maybe adjusted to any predetermined weight of pull through the medium" of'ascrew having adeep spiral thread receiving r loop of the weight control' spring and adapted to emit" an" audible click every quarter turn to' announce a change in weight of pull within a preferred range of from A pound-tomore-than- 2 pounds-insteps of about A; pound per-click.

;' A-further object isto provide apparatus" of this type which will unfailingly set itself for th'e'weight selectedeach' time the bolt is closed and will be proof against jar-ofi' at any'weight of pull.

A further object is to provide apparatus" of thi's' type which will beformed' ofa-few' strong simple and durable parts; which will-be inexpensive to' manufacture and which will: not easilygjet out of order.

Withthe above and other objects irr viewtheinvention consists of certainnovel-det'ails ofcon' struction and combinations of parts hereinafteriully described and: claimed; it being understood that various modifications may be resorted to within the scope of the appended claim without departing from thespirit or sacrificingany'of the advantages of the invention.

In the accompanying drawingforming'part' of" thisspecificatiQn,

Figure 1 is a side elevation of a bolt action'rifie";

.with' portions broken away, to expose a trigger spring tensioning device constructed in accordance with the invention.

Figure 2 is a fragmentary plan view of the trigger guard plate and parts carried thereby including the flipper, trigger, and control springs.

Figure 3 is a perspective view of the trigger, weight controlled screw and control springs.

Figure 4 is a perspective view of the sear.

Figure 5 is a perspective view of the sear extension finger.

Figure 6 is a perspective view of the flipper, and its resetting spring.

Figure '7 is a perspective view of the weight controlled screw.

5 Referring now to the drawing in which like characters of reference designate similar parts in the various views, Ill designates a bolt action rifle.

In carrying out the invention a substantially straight sear H is provided on the top near the forward end with a hinge eye [2 to which a hinge mue f3 is passedinto the side plates of the lock mechanism: A helical spring I; is housed'in arecess ['5 formedip" the topof the compartment and bears-upon the topof the front end of the" seartowonstantly urge the" rearend" of the sear 5 upwardly.

The rear end of the sear is provided with a shoulder [G -which is b'eveled at the" rear corner to provide an abutment face ll which" engages a beveled abutr'nent face f8 on the front lower edge" 10 ofthe" cocking 'pi'e'c'e nosa [9. The beveled faces l 1 an'd l8 are encli'ned at" an angle of" about 30 degreesrelativettrthe axis ofthe-barrel so that wlien'thebolt lllis cocked"- there will exist" a forward component of" force ali'dialSO'a downward: 16-" component of force-at the constant faces. The downw'ard component of force tends-- to force the sear downwardly and is resisted by" the searextension finger 2 1.

'Ihe'sear extension finger-2l is-receivedat" the 20% upper end between hinge ears 22 which extend downwardly fromthebottom of therearend' of the scar; and apivo'tpin 23 is" passed through tliefinger and ears-to pivotally mount the finger oathesear; Thetop face' of thefinge'r is spaced 25 fromthebottomiace o'f the sear to. provide sufiicient' clearance for thefinger to pivot relatively tothesearz- A" helical spring M ismountedin a vertically extending opening 25 in the bottomface of thasear 'and bearsagainst the top" face of the extension finger" forwardly of its pivot piir-23 to ho-ld' tl'iefinger in engagement-with theflipper-26.

The flipper 26 is substantially triangular in' contour" and is--provided with two upperfaces 5'. 2"! and 28 01 respectively difierent gentle slopes forming a shoulder 29 between them against which the lower end of the sear extension finger is lodged. The flipper is provided with a rearwardly extending finger 30 having a longitudi- 40 nal slot 3| therein, the rear wall 32 of the slot being sloped downwardly and rearwardly to slidably receive a similarly shaped surface 33 on the trigger when a hook 34 on the trigger is engaged with the top face of the finger 30, with a lap 4-5 of about of an inch, to securely lock the flipper against downward thrust of the sear extension finger until the trigger is pulled.

The flipper is normally held in position to receive the sear extension finger through the meso dium of a U-shaped spring 35 which is engaged in a notch 36 in the rear face of the flipper and has legs looped around a pivot pin 31 which is passed through the flipper and into the top plate 38 of the trigger guard 39. The free ends of 5;,

recess.

the legs extend forwardly from the pivot pin and bear against the top plate of the trigger guard. Pressure of the spring on the flipper instantly returns the flipper to normal position after each actuation by the trigger.

The trigger is provided with a finger 4| which underlies the finger 26 of the-flipper. A pivot pin 42 is passed through the finger and into the top plate 38 of the trigger guard to pivotally mount the trigger. A U-shaped spring 43 is engaged in a notch 44 in the top face of the flnger 4| and the legs are trained underneath the pivot pin 42 and directed forwardly to bear at the free ends against the top plate 38 of the trigger guard. The spring exerts a rearward pressure upon the trigger rearwardly of the pivot pin 42 to assist the weight spring hereinafter described in returning the trigger to normal position to engage the hook 34 with the flipper after each actuation.

The front face of the trigger is cut away to provide a recess 45 in which is rotatably mounted a weight control screw 46 having a deep worm thread 4'1. The screw inclines rearwardly in the A U-shapedweight control spring 48 is engaged with the thread of the screw and the legs are passed rearwardly and looped around the pivot pin 42 of the trigger, thence directed forwardly to bear with the free ends of the top plate 28 of the trigger guard. This spring resists pull upon the trigger and controls the weight wardly or upwardly on the thread of the screw to respectively increase or diminish the tension of the spring and correspondingly vary the Weight of pull required to actuate the trigger and dislodge the sear extension finger 2| from the flipper.

A continuous groove 50 is formed circumferentially in the head of the screw as best shown in Figure 7 and preferably four equally spaced notches 5| are formed in the bottom of the groove. The groove receives a plunger 52, best shown in Figure 1, which is mounted in a recess 53 formed in the trigger at a right angle to the axis of the weight control screw 46. A helical spring 54 is disposed in rear of the plunger and is held under tension against the plunger through the medium of a screw plug 55 which closes the outer end of the recess. The plunger drops into the notches 5| successively as the screw is rotated and provides four definite stops per turn of the screw with respective audible clicks as the plunger rides from the groove into the notches. These stops can also be felt through the screw driver at the completion of each quarter turn of the screw.

Behind the trigger a screw 56 is threadedly engaged in a recess 5! formed in the trigger guard and bears against the lower face of the finger 4| in rear of the pivot pin 42. By screwing the screw 46 in or out the creep or overlap of the hook 34 of the trigger with the finger 26 of the flipper may be adjusted.

When the trigger is pulled against the tension of the weight control spring 48, downward pressure of the sear extension finger 2| turns the flipper slightly, as indicated by the arrowheads in Figure 1, and thus dislodges the sear extension finger from the shoulder 29. The sear being thus released the cooking nose I 9 passes instantly over the shoulder l6 of the sear to fire the gun. Immediately after the dislodgement of the sear extension finger the controlling spring 35 of the flipper returns the flipper to normal position.

The trigger cannot be pressed rearwardly enough to interfere with the operation as the upper face of the finger 4| contacts the stock, or the lower end of the trigger contacts the guard.

From the above description it is thought that the construction and operation of the invention wil be fully understood without further explanation.

What is claimed is:

In a firearm, a pivoted spring pressed trigger, a pivoted spring pressed flipper, interlocking means between the trigger and flipper yieldably holding the flipper in set position, a sear, interlocking means between the sear and flipper engageable by movement of the flipper under impulse of the trigger, after release of the first named interlocking means to release the sear, a weight control spring connected to the trigger and exerting pressure against the trigger to hold the first named interlocking means in operative position, a weight control screw having a worm thread engaging said spring to vary tension on the spring, said screw having a head provided with a circumferential groove, there being notches in the bottom of said groove, and a spring pressed plunger disposed laterally of the screw head and engageable in said groove and notches to provide audible clicks as the plunger rides from the grooves into the notches during rotation of the screw.

RALPH H. PIKE.