US2335889A - Gun - Google Patents

Description

W. SUMMERBELL v GUN Filed July 15, 19:59

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Patented Dec. 7, 1943 UNI-TED STATES PATENT OFFICE l GUN William Summerbell, vWatervliet, N. Y. Application July 13, 1939, Serial No. 284,255 4 claims. (c1. li27o (Granted under the act of March 3, 1883, as` 1 amended April 30, 1928; 370 0. G. 757) The invention described herein may be manufactured and used by or for the Goverment for governmental purposes, without the payment to me of any royalty thereon.

This invention relates toa gun.

In guns of the type shownin Patent No. 1,144,285 of June 22, 1915, a breech block operating on the blow-back principle is arrested at the end of recoil and then released by a trigger to advance a cartridge into the gun barrel.

'Ihe purpose of this invention is to provide a simple and efficient sear and trigger mechanism for a breech block and to provide means for opposing actuation of the trigger to release the block in the event that a cartridge is already in( the barrel. This latter provision is particularly necessary in a gun using fused ammunition.

The specific nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as shown in the accompanying drawings in which:

Fig. 1 is a plan view of the breech end of a gun with parts removed and parts in section showing the breech block in battery and the trigger in normal position.

Figs. 2 and 3 are sectional views on' the corre- Fig. 4 is a view in side elevation of therear end of the gun frame.

Fig. 5 is a sectional Fig. 1. g

Fig. 6 is a sectional view on the line 6-6 of Fig. 5.

Referring to the drawings by characters of reference there is shown a gun frame A, a barrel B xed to the frame, and a reciprocable breech block C of the blow-back type. The means for checking the breech block in recoil and returning it to ring position or into battery forms no part of this invention and is not shown. The breech block is arranged to advance a round of ammunition D into the chamber b of the barrel and to iire the round before the block reaches the rear face of the barrel so that the gas pressure is rst utilized to arrest the forward motion of the block before acting to drive it rearwardly in recoil. The lower face of the breech block is formed with a lug 5 having a cam face 6 inclined to the longitudinal axis of the block and a shoulder 'I disposed transversely of the axis of the block.

The gun frame A, as shown in Fig. 2 is formed from a. cylindrical tube that is partially cut away view on the line 5-5 of to receive spaced parallel plates 8--8 for supporting and guiding the breech block. A trigger housing 9 is attached by means of screws I0 to the under side of the lower plate 8 adjacent its rear extremity.

A sear II mounted in thehousing 9 on a pivot pin I2 has a. rearwardly extending arm I3, a forwardly extending arm I4, and a laterally extending arm I5. An upright stud I6 on the arm I3 extends throughv an opening I'I in the lower plate 8 and into the path of movement of the lug 5 on the breech block. A depending stud I 8 on the lateral arm I5 is disposed in the path of movement of the toe I9 of a trigger 26.

The trigger is positioned transversely of the housing.9, underlies the rear arm I3 of the sear, and is mounted on a pivot pin 2| threadedly secured in the housing. The shank of the trigger passes through an opening 22 in a safety bolt 23 which is slidably mounted in the housing. The lingerv piece of the trigger projects laterally from the housing in front o f a rigid handle 24 on the housing. j

A safetir latch 25 slidably mounted in the han'- dle and normally urged outwardlyv against a stop shoulder 26 by means of a spring 21 has asolid inner end projecting into the path of movement of the bolt 23. An aperture 28*V is formed in the latch adjacent the solid inner end so that when the latch is moved towardsthe gun frame against the action of the spring, the aperture will bein 4line with'the bolt 23 to enable the bolt to'be moved rearwardly under impulse from the trigger.

A plunger 29 disposed transversely in the housing 9 is held by a spring 30 against the forwardly extending arm I4 of the sear II. The plunger normally maintains the sear in a position with the upright stud I 6 in the path of the lug 5 of the breech block and with the depending stud I8 in rearmost position whereby it acts on the toe I9 of the trigger 20 to hold the projecting finger piece of the trigger in foremost position. Such positioning of the trigger insures the forward displacement of the safety bolt 23 with the safety latch 25 automatically moved or held in a position to oppose retraction of the bolt and movement of the trigger.

'Iw'he gun barrel B (Fig. 6) is provided with a counterbored radial passage 3l for housing a plunger 32 whose inner end is normally protruded into the cartridge chamber b by means of a. spring 33 acting on a collar 34. The spring is seated on a plug 35 threaded into the barrel to close the passage 3| and the plug is provided to an operating rod 43 pivotally connected to the trigger 20. The slide is formed with a diametral slot 44 for receiving a latch 45 which is mounted adjacent its forward end on a pivot pin 4G. Ak

rearwardly extending nger 41 on the latch extends nto the slot 39 in the housing and its rear end is normally positioned forwardly of the plunger 32. The latch is maintained in this position by means of a p1unger48 and plunger spring 49 housed in the slide.

The elements of the trigger group, when at rest, are normally in the position shown in Fig. l. When the breech block C is retracted the cam face 6 of the lug 5 strikes the upright stud I6 on the sear and causes the sear to rotate about its pivot and compress the spring 30. When the lug clears the stud I6,.the sear is immediately restored by spring 3l) to interpose the stud IB in the path of the shoulder 1 and thereby hold the breech block in the retracted or loading position.

When it is desired to release the breech block so that it may advance a cartridge into the barrel, the operator grasps the rigid handle 24 and the trigger 20, employs his thumb to move the safety latch 25 and align the aperture 28 with the safety bolt 23, and then contracts his ngers to pull the trigger 20. 'I'he toe I9 of the trigger acts on the depending stud I8 to move the sear and release the breech block.

Upon retraction of the trigger the slide 40 and latch 45 are also moved rearwardly and the latch is positioned in line with the plunger 32. As the carriage advanced by the breech block entersthe chamber b of the barrel theplunger 32 is moved outwardly-and displaces the latch. Upon release of the trigger the slide returns to its normal forward position and moves the latch clear of the plunger 32 so that therspring pressed` plunger 48-49 may restore it to its normal position. 'Under the condition where a cartridge isin the chamber and the breech block held in the loadingposition by the sear, the plunger 32 is extruded into the path of the latch and will thereby prevent retraction of the trigger which would release the breech block to advance a second cartridge towards the already loaded chamber b. 5 I claim:

1. In a gun, a frame, a breech block reciprocable in the frame, a lug on the breech block, a housing' attached to the frame,a searpivotally mounted in the housing transversely thereof and .formed with a forwardly extending arm, a rearwardly extending arm and a laterally extending arm, a stud on the rearward arm extending into the frame for engagement with the lug on the breech block, a downwardly extending stud on the lateral` arm, a spring acting on the forward arm, a trigger pivotally mounted transversely in the housing and having a toe engaging the stud on the lateral arm of the sear, a safety bolt in the housing operatively engaged by the trigger, and a manually operable latch normally opposing movement of the bolt.

2. The invention of claim 1 characterized in that the relative position of the trigger latch and trigger is such that they may be manually operated substantially simultaneously with one hand to release the breech block.

3. In a gun,V a frame, a breech block reciprocable in the frame, a housing attached to the frame, a sear pivoted in the housing for movement in a plane parallel tothe axis of reciprocation of the breech block, a stud on the sear extending into the frame in a direction transverse to the plane of sear movement, a lug on the breech block adopted to be engaged by the stud,

means normally holding the sear in position to engage the breech block, and. atrigger pivotally mounted in thehousing, in a plane parallel and adjacent to the sear and overlapping the sear and having operative engagement therewith, to move the sear and be moved thereby.

4. In a gun, a frame, a housing attached to the frame and including a projecting. handle, a trigger pivotally mounted in the housing for swinging movement toward the handle,Y a safety bolt in the housing and connected to the trigger for reciprocation in a direction Vtransverse to the handle upon movement, of the trigger, a, latch mounted in the handle for sliding'4 movement along the axis thereof and normally opposing movement of the bolt, and a thumbpiece on the latch for moving the latch to free the bolt.

WILLIAM ,SUMMERBELL

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