US2143028A

US2143028A - Firearm

Info

Publication number: US2143028A
Application number: US183375A
Authority: US
Inventors: Pike Ralph
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-01-04
Filing date: 1938-01-04
Publication date: 1939-01-10
Anticipated expiration: 1956-01-10

Description

Jan. 10, P v FIREARM Filed Jan. 4 1938 ATTORNEYS Patented Jan. 10, 1939 1 r pi FIREARM 3 Claims.

This invention relates to fire arms and has for an object to provide a self-setting set trigger mechanism for a bolt action rifle, which will be simple, safe, easily and cheaply constructed, capable of adjustment to pull without disassembling the gun, and can be readily applied to bolt action rifles already in existence as well as those in the process of manufacture.

A further object is to provide a bolt action which will be much safer than the conventional bolt actions on account of the sear being locked into place by the sear dog and the sear dog release, rather than the safety feature being dependent solely upon the sear spring as in corn ventional bolt actions.

A further object is to provide a self-setting trigger mechanism which will be of balanced construction throughout, will reduce possibility of accidental discharge to a minimum, and will prevent malfunctioning due to inertia at discharge.

With the above and other objects in view the invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that various modifications may be resorted to within the scope of the appended claims without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawing forming part of this specification,

Figure 1 is a fragmentary side elevation of a bolt action rifle partly broken away to expose self-setting trigger mechanism constructed in accordance with the invention.

Figure 2 is a perspective view of the sear.

Figure 3 is a perspective view of the sear dog.

Figure 4 is a perspective view of the sear dog release.

Figure 5 is a perspective view of the trigger.

Referring now to the drawing in which like characters of reference designate similar parts in the various views, l0 designates a bolt action rifle. In carrying out the invention a substantially straight sear l l is provided on the top near the forward end with a hinge eye l2 through which a hinge pintle I3 is passed into the side plates of the lock mechanism compartment. A helical spring I4 is housed in a recess l5 formed in the top of the compartment and bears upon the top of the front end of the sear to constantly urge the rear end of the sear upwardly.

The rear end of the sear is provided with a shoulder it which is beveled at the upper rear corner to provide an abutment face I! for engagement with a beveled abutment face I8 formed on the front lower edge of the cooking piece nose [9. The angular inclination of the beveled contact faces I! and I8 is about 30 relative to the axis of the barrel so that when the bolt 28 is in cocked position there will be a for- The sear dog 2| is provided at the upper end 1 with an angularly disposed finger 22 which terminates in an obliquely disposed face 23. The finger is received in a horizontal, longitudinal slot 24 formed in the rear end of the sear, and having the bottom wall spaced from the face 23 of the sear. A pivot pin 25 is passed through the sear dog and into the walls of the slot in the sear to pivotally assemble these parts. A helical spring 26 is mounted in a vertically extending hole 21 in the bottom of the slot 24 and bears against the sear dog to yieldably hold the dog in. engagement with the sear dog release 28.

The sear dog release 28 is substantially triangular in contour and is provided with an obliquely disposed front face 29 having a notch 30 formed therein to receive the tip of the sear dog. The sear dog release is provided with a rearwardly extending finger 3| having a longitudinal slot 32 therein, the rear wall of which. is sloped downwardly and rearwardly to provide a hook 33 which receives a similarly shaped hook 34 on the trigger to lock the sear dog release against thrust of sear dog.

The sear dog release is normally held in rearward position by a U-shaped spring 35 the legs of which are wrapped around gudgeons 36 which pivotally mount the sear dog release in the lock mechanism compartment of the gun. The legs are carried forwardly from the gudgeons as shown at 31 and engaged upon the bottom plate 38 of the compartment so that the pressure of spring 31 on sear dog release 3| returns sear dog release to rearward position against the trigger at 40 when sear dog over-rides face 29. The crux of this invention lies in the fact that the sear dog release returns to set position with trigger instantly and of its own accord, due to the fact that the sear dog over-rides notch 30 in the sear dog release.

The trigger 39 is provided with a rearwardly extending finger 40 which underlies the finger 3| of the sear dog release. A pivot pin 4| is passed through the finger and into the bottom plate 38 to pivotally mount the trigger. A substantially U-shaped spring 42 bears against the front face of the finger 40 and the legs of the spring are wrappedaround the pivot pin 4| and thence carried forwardly as shown at 43 and engaged with the bottom plate 38. Thus the spring exerts a rearward pressure upon the trigger above its pivot pin to hold the hook 34 of the trigger engaged with the hook 33 of the sear dog release.

A screw 44 is threadedly engaged in a recess 45 formed in the bottom plate 38 and bears against the rear end face of the finger 40. By screwing screw M in or out the action of the trigger may be adjusted without disassembly of the gun.

The notch 39 in the sear dog release is slightly acute which prevents the sear dog from disengaging from the sear dog release. When the trigger is pressed suificiently to disengage

hooks

33 and 34 pressure on sear dog causes sear dog release to revolve slightly with a dumping action.

' The sear is thus released and the cooking piece nose passes instantly over the shoulder it of the sear to permit firing of the gun.

The trigger as above stated moves into contact with the trigger guard as soon as the trigger is disengaged from the sear dog release so that the return of the sear dog release to operative position will not be interfered with.

The sear dog release is so designed that it cannot revolve far enough to destroy the tension of the spring, and also to indicate that the trigger is in functioning position.

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

What is claimed is:

1. In a firearm, a pivoted spring pressed trigger, a pivoted spring pressed sear dog release, interlocking means between the trigger and dog release yieldably holding the dog release in set position, there being a notch in the dog release on the opposite side of the pivot thereof from said means, a sear dog engageable in said notch, a spring pressed pivoted sear connected to the dog, a cooking piece nose slidable upon the sear, and obliquely disposed contact faces on the sear and nose permitting of firing spring pressure being exerted on the scar and dog to hold the dog engaged in the notch in the dog release when the nose is in cocked position, the trigger disengaging said interlocking means and rocking the dog release to dislodge the sear dog from said notch and release the sear.

2. In a firearm, a pivoted spring pressed trigger, a pivoted spring pressed sear dog release, interlocking means between the trigger and dog release yieldably holding the dog release in set position, there being a notch in the dog release on the opposite side of the pivot thereof from said means, a spring pressed sear dog slidable upon the dog release and engageable in said notch, a pivoted spring pressed sear pivotally connected at the rear end to the upper end of the dog, a cooking piece nose slidably mounted on the sear and contact faces on the rear end of the sear and on the front end of the nose inclined at an angle of approximately 30 relatively to the axis of the fire arm barrel and permitting of firing spring pressure being exerted on the sear and on the dog to hold the dog engaged in the notch in the dog release when the nose is in cocked position, the trigger disengaging said interlocking means and rocking the dog release to dislodge the sear dog from said notch and release the sear.

3. In a firearm, a pivoted spring pressed trigger having a finger at the upper end provided on the top face with a hook, a pivoted spring pressed sear dog release provided with a finger overlying the finger. of the trigger and formed with a slot the rear wall of which is beveled to form a hook adapted to interlock with the hook of the trigger and yieldably hold the sear dog release against accidental movement, there being a notch in the sear dog release on the opposite side of the pivot thereof from the finger, a sear dog engageable in said notch, a spring pressed pivoted sear connected to the dog, a cocking piece nose slidable upon the scar, and obliquely disposed contact faces on the sear and on the nose permitting of firing spring pressure being exerted on the sear and on the dog to hold the dog engaged in the notch in the dog release when the nose is in cocked position, the trigger disengaging the hooks of the trigger and the sear dog release and rocking the dog release to dislodge the sear dog from said notch and release the sear.

RALPH PIKE.