US129433A - Improvement in breech-loading fire-arms - Google Patents

Description

0'. SMITH.

Improvement in Breech-Loading Fire-Arm's.

Patented July 16,1872.

51 WWIIIIIII l.

rel.

UNITED STATES P TENT OFFICE.

IMPROVEME NT IN BREECH- LOADING FIRE-ARMS.

Specification forming part of Letters Patent No. 129,433, dated July 16,1872.

To all whom it may'concern:

Be it known that I, DEXTER SMITH, of Springfield, in the county of Hampden and State of Massachusetts, have invented a new and useful Improvement in Breech-Loading FireArms; and I do hereby declare that the following is afull, clear, and exact description thereof, reference being had to the accompanying drawing making a part of this specification and to the letters of reference marked thereon, in which- Figure 1 is a longitudinal section of a portion of the arm made according to my invention, showing the breech-block in place at the rear of the barrel. Fig. 2 is a longitudinal section of the same, showing the breech-block swung partially back from the rear of the bar- Fig. 3 is a plan view of the lower side of the breech-block, showing the slot in which the cam operates. Fig. 4 is a side view of the extractor. Fig. 5 is a side view of the lever and its spindle which operates the extractor and breech-block; and Fig. 6 is a plan view of the same.

My invention relates to that class of breechloading firearms in which the breech-block swings backward and downward away from the rear of the barrel when opened; and it consists of a swinging breech-block having a vertical slot made therein, in which operates a thin plate, through which is made a square hole. The breech-block has a hole therein, into which fits a spindle attached to a lever; and the gun-frame has two holes therein, through which the spindle is inserted from the outside of the frame, passing also through the hole in the breech-block; and the said spindle has a part of its length made of prismatic form, which, when the spindle is inserted through the breech-block, fits into the square hole in the thin plate contained in the breechblock. The said thin plate has a slot made therein concentric with the center, upon which it swings, and a pin is inserted through the breech-block, passing through the slot in the thin plate. This arrangement gives the plate a movement independent of the breech-block when operated by rotating the spindle of the lever, which movement is, however, limited by the pin which passes through the slot in the plate, so that the plate moves the block after finishing its own independent movement. The

rear end of the thin plate is beveled, and a locking-bolt is pivoted to the frame, the upper end of which bolt is kept in beneath the breechblock by means .of a spring, and operating to lock the block up in place in rear of the barrel; and when the thin plate and block are moved down by the lever the lever moves a short distance first, and its beveled rear end strikes against the bolt and forces it out from beneath the breech-block, and the block, which is then moved by the plate, is free to move down also. When the lever is moved to close the block the plate moves first, and then carries with it the block also.

That others skilled in the art may be able to make and use my invention, I will proceed to describe its construction and operation.

In the drawing, A represents the frame of the arm, having a recess, B; and 0 represents the barrel, and F the chamber into which the cartridge is placed. B represents the breechblock, and E a lever, having a spindle, H, at-

tached, a part of which, f, is made cylindrical,. and the part m also, in order that the breechblock may turn freely thereon, and the part a of the spindle fits the square hole b in the plate D. This plate has a slot, 0, and a projection or shoulder, c, thereon, both of which are made concentric with the center of the square hole b, and the end is beveled at a, and a vertical slot, d, is made in the lower side of the breechblock, into which the plate D is inserted, and a small pin, 0, is then inserted in the breech block, passing through the slot 0 in the plate. The breech-block is then put in its place in the frame of the gun, and the spindle of the lever E is inserted through the frame and breech-block, a cylindrical hole being made in the block for that purpose, which fits the cylindrical part of the spindle so as to turn freely thereon, and the prismatic part 12. of the spindle fitting into the square hole b in the plate. When thus arranged in place the spindle H has a bearing in both sides of the gun-frame, and is kept in place by a screw turned in at the end m against the gunframe. A bolt, a, is pivoted to the frame at s, and arecess, h, is made in the frame behind the breech-block, and a spring is arranged in the frame to keep the bolt thrown forward when the breech-block is up in place behind the barrel.

- The operation of myinvention is as follows:

in, is in place, pivoted upon the spindle H, the

' lever is upon the outside of the frame, and

when the block is up against the rear end of the barrel the locking-bolt a is thrown forward by its spring beneath the block in the position shown in Fig. ,1, and the lever E is then in a longitudinal position, with reference to the gun, upon the outside of the frame, If the lever be pressed down the prismatic part 11. starts the plate D downward, and the beveled part a impinges against the upper end of the lockin g-bolt a, moving it out from beneath the breech-block into the recess h. While this movement of the plate is going on the spindle H revolves within the breech-block, but when the bolt a is thrown entirely out from beneath the block the plate D has then moved down so that the small pin "6 is caught ,by the slot 6 in the plate, and the plate then moves the block down also, the locking-bolt furnishing no positive resistance to the downward movement of movement the spindle revolves within its bearing in the breech-block; but when the plate strikes against the pin 6 or against the upper edge of slot d, as before mentioned, the block moves up with the plate, so that in either movement of the block, whether down or up, it is operated directly by the plate. If a shell be placed within the chamber F and the block is up in place at the rear end of the barrel, when the plate is rotated by the lever and spindle the projection 0 upon said plate impinges against the flange of the shell and the shell is withdrawn from the chamber, or is sufr 'ficiently started that it may be easily with? drawn by the fingers. It is evident that the prismatic part 01. might be made near the end of the spindle H, and the plate D be placedin a recess in the side of the breech-block, in which case the projection 0 should be made long enough to reach the flange of the cartridge,

Any required amount of movement may be given to the plate D independent of the move ment of the block by making the slot 0 in the plate either longer or shorter, as may be desired; or if the plate be placed in a recess in the side of the breech-block, by making said recess wider.

Having thus described my invention, what I claim as new, and desire to secure by Let ters Patent, is-' 1. The plate D, provided with the prismatic hole 11, the extracting-shoulder c, the slot 0, and the beveled end a, and adapted for use, in connection with the breech-block B, through the medium of the pivot H and lever E attached thereto, all substantially as described.

2. I claim the combination of the plate D having the shoulder sand the prismatic hole I) and slot 6 therein with the recessed breechblock B provided with a stop, whereby a limited movement is given to said plate, and the,

whole adapted to be operated through the medium of the pivot H and lever attached thereto, substantially as described.

3. I claimthe plate D, breech-block B, lock? ing-brace a, and pivoiiA, when constructed, combined, and adapted to be operated by a lever attached to said pivot outside of the frame, substantially as described.

DEXTER SMITH.

Witnesses:

T. A. CURTrs, CLARENCE BUOKLAND.

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