US58783A - Improvement in projectiles for ordnance - Google Patents

Description

UNITED 'raras 'PATENT J. M. CURRIE, OF WASHINGTON, IOWA.

Specification forming part of Letters Patent No. 58,783, dated October 16, 1866.

ingdrawings, making part of this speeiiication, and to the letters ot reference marked thereon,like letters indicating like parts Wherever they occur.

To enable others skilled in the art to con- I "struct and use the invention, I will proceed to describe it.v

i Figure l represents a side elevation, with a portion shown in section, to show the form' of the projectile and the packing. Fig. 24is a transverse section, taken on the line .rx of Fig. l.

My invention relates to elongated projectiles intended t'or use in rilied ordnance.

ln the drawings, A represents the projec tile, which may be made ot' cast-iron. I make this projectile with a conical point, as represented in Fig. l, and at a point about onethird ot' its length from the front end I begin to decrease it in diameter, continuing the decrease toward the rear end for about one-third ot' its entire lengtlnwhen it is again increased in size, as shown in Fig. l. By this means I provide a cavity or recess around its central portion for the reception ot a packing-ring, B, of soft metal.

From the rear end ot" the packing the projectile extends back to a point, the rear end thus forming acone, as shown.

In the cavity formed around the centi-al portion of the projectile I casta ring of lead, as represented by B, the rear end ot which projects laterally beyond the sides of the body A, this packing-ring B forming a bearingsur face extending from a to e.

It will be observed that the surface of the body A Where the packing is tted upon it forms an incline, up which the packing B will be driven by the force of the gas acting against its rear shoulder, a, and that by this means the ring B will be expanded laterally, and thus forced into the grooves of the gun.

By thus forcing the ring B up the incline it will be expanded equally from front to rear, and thus the projectile will have a firm bearing along its entire cylindrical portion, by which means it will occupy a correct position in the bore oi? the gun, the axis of the projectile and that of the bore thus being made to coincide perfectly, and insuring its accurate passage along the bore and from the muzzle of the gun.

It' in practice lead is found to upset at the rear,instead of driving np the iueline,an alloy otflead and harder metal may be used Ato torm the packingrin g B.

One or more grooves, c, are formed along the surface ot' the inclined portion otl A, as shown in Fig. 2, in which the lead or other metal forming the packing-ring will engage,

and thus prevent the ring from becoming loose upon the projectile as the latter rotates in its iiight.

As the rear portion of the recess is the deepA est, the shoulder-in rear of the recess will prevent the packing from slipping 0E at the rear, even if it becomes loose by being driven up the incline.

By these means I produce a projectile for ritled ordnance which has a true bearin g along its entire cylindrical portion, which will take the riiiing with regularity, evenness, and certainty, and which, While having a conical point, may be made solid and stillhave its ecnter ot' gravity in front of its center ot' length.

Having thus described my invention, what I claim is- The projectile A, with the conical point. and tapering rear, having the packing-ring B ap plied as shown and described.

J. M. GURRIE.

Witnesses:

P. T. Do-DGE,

L. L. BOND.

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