US628106A - Gas-check for projectiles. - Google Patents

Description

No. 628,!06. Patented July 4, I899.

H. s. mxlm & m1. DAWSON. I

fiAS CK PROJECTILES,

cation e Aug.24,1898.) (No Model.) 2 Sheets-Sheet l (No Model.)

No. 628,)6. Patented July 4, 1899. H. s. MAXIM & A. T. DAWSON. GAS CHECK FOR PROJECTILES.

(Application filed Aug. 24, 189B.)

2 Sheets-Sheet 2 iniren Shires Mir-int @rric ENG-LAND, ASSZGNORS TO 8A....IE PLACE.

THE VICKERS, SONS Ch MAXIM, Ll'llilTED, OF

it PRGJECTFLES.

S?ECIFZOATIGN forming part of Letters lifetent No. 628,106, dated July 4-, 1 899. Application filed August 24, 1898. Serial No. 689377 (No model.)

To all whom it may cancer/tr Be it known that we, HIRAM STEVENS :aiAXIM, a citizen of the United States, Chevalier of the Legion of Honor and civil and mechanical en gi neer,and ARTHUR Tnnvon DAW- SON, a subject of the Queen of Great Britain, late of the Royal Navy, both residingat 2S Victoriastreet, London, England, have invented certain new and useful Improvements in Gas Checks forProiec-tiles, of which The following is a specification.

It has heretofore been usual to provide projectiles with means for preventing or diniinthe bore of a n when heavy charges are used therein. in 5 inc cases ithns been customary to equip the projectile with a or disk so arranged in combination with plastic ring or gas-check that at the moment of the discharge of gun the gas-check u "ll be subjected to eater pres e per sr uare inch of its area. than that existing in the gun at the rear of the projectile.

The object of our present invention is to produce a eck or ring of this character cspeeiellydes for the projectiles of heavy guns, which, while suflicientlyplastic to adapt itself to the bore of the gun, will have greater stability and will he capable of resisting a greater shearing stress than the rings formed of wax, plumbztgo, and asbestos heretofore used.

In order that our improvement may he clearly understood and readily carried into effect, we shall describe the same with reference to the accompanying four figures of drawings, which are sectional views showing the improved gas-check in its preferred and modified forms and illustrating the manner of applying it. to different forms or" projectile;

Figure 1 illustrates the whole of the rear] portion of a projectile provided with bur improved gas-check; but tlrereinaining figures show only so much of the rear end of the pro jectile, the annular base-piece, and the pies tic ring as is necessary for a proper cornpre hensiou of the inztnnerin which our invention is or may be utilized or applied In allthe-figures, A is the projectile, and a flange D which lies directly in cont isning the erosive eiiecis of the explo ve upon the boss at the base thereof. B is the annw 5o lar hase-pieceor collar, G the plastic ring or gas-check, and Dthe driving-hand.

Referring more particularly to Fig. l, the periphery of the boss a is screw-threaded to receive the corresponding screw-threaded portion Z) of the annular piece or collar B, the direction of the screw-threads being opposii i that of the riding of the gun. The sai ,nnular piece or collar B is dished at h to in. part elasticity to said collar and toforiu the forwardly-projecting peripheral porti l r the plastic ring C. This ring is co of copper wires 0, embedded in ashes -i wax and pluinhego and t "d and coated orcovered w enieter of the projectile is di at it", so that the flange b of the ennui ,r p B, although not greater in diameter than t drivingbsnd D, can act upon the plastic i C. in some cases, h wever, the diameter of the said annular piece 13 may be large snow to engage with the rifling'of the gun. ih plastic ring C is formed with a shoulder c to lit the corresponding shoulder formed by diminishing the diameter of the projectile at ct,

such shoulder effectually preventing the plastic ring from shifting forwardly when acted upon bythe flange of the annular piece 13. We prefer to constructthe driving-band as shown at (1, so as to prevent the entrance of the projectile too far into the gun in cases Where the bore is too loose-for example, when it has been enlarged by erosion.

The plastic ring is in the above-described construction unprovided with the metallic coating or covering; but in Figs. 2, 3, and 4 such coating or covering is shown on the ring. In Fig. 2 it consists of numerous convolutions of thin wire 0 wound around the circumference of the ring. In Figs. 3 and +1- it consists of a casing 0 inclosing the saidring on its exposed surfaces. In these examples the metallic coating or covering may be opplied to. the ring by electrodeposition, or at thin casing of sheet metal of thcpropcr shape and dimensions may he made and be applied to the said ringin an y appropriate manner The plastic ring is in Fig. 4 made wider than that shown in the previous figures; so as to overlap the rear portion of the band D. In other respects the construction of the parts shown in Figs. 2, 3, and 4 is similar to that illustrated in Fig. 1. p

In the foregoing constructions the pressure of gas acting behind the annular piece B has to crush or deform the latter before the plastic ring 0 can be compressed suificiently to force it radially outward against the bore of the gun.

Having now described our invention, What We claim is- 1. The gas-check for projectiles herein de-' scribed, consisting of a ring composed of wire coils or rings embedded in a mass of plastic material compacted and molded to the proper form under pressure.

2. The gas-check for projectiles herein described consisting of a plastic ring composed of wire coils or rings embedded in a compacted mass of asbestos saturated with a mixture of wax and plumbago.

3. The gas-check for projectiles herein described consisting of a ring composed of wire coils or rings embedded in a mass of plastic material, compacted and molded to the proper form under pressure and coated or covered with a metal such as copper.

In testimony whereof we have hereunto set our hands, in presence of two subscribing witnesses, this 29th day of- July, 1898,

HIRAM STEVENS MAXIM. ARTHUR TREVOR DAWSON.

Witnesses:

JOHN G. SHIELDS, WALTER W. THORPE.

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