US 927852 A
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. C. GRUNWALD. ARMOR PIEROING- PROJBCTILE.
APPLICATION PILED-APE.1B, 1901.
Patented July 13, 1909.
UTTED STATEB ATENT @i ll lilll.
CARL GRUNWALD, OF BREDENEY, GERMANY.
ARMOB-PIERCING PRO JECTILE To all whom it may concern:
Be it known that I, CARL GRUNWALD, a subject of the Emperor of Germany, and a resident of Bredeney, Prussia, Germany, have invented certain new and useful Improvements in Armor-Piercing Projectiles, of which the following is a specification.
The present invention relates to armor piercing projectiles of the type which has a hard steel core which abuts against the base of a mantle.
The object of the invention is to increase the penetrating capacity of such armor piercing projectiles.
In the accompanying drawing; Figure 1 is a longitudinal section through one embodiment of the invention, and Fig. 2 is a corresponding top view, partly in section on line 22, Fig. 1.
The projectile is provided with a core A of hardened steel and a mantle B B which may be made from ordinary unhardened steel. The solid base B of the mantle abuts against the bottom face of the core A and is of a weight that amounts to about 1- to or more of the total weight of the projectile. The hollow part B of the mantle surrounds the core in spaced relation throughout the greater part of its length and in such a manner that the part B only lies against the circumference of the core directly below the point of the core and directly above the bottom face of the core. The thickness of the wall of thepart B is so selected that it has the rigidity necessary for the shipment of the projectile and for the centering of the same in the barrel, but the rigidity must not be so great that the mantle is simply stripped oil when the core passes into an armor-plate. On the contrary the strength of the wall must be so slight that the part of the kinetic energy of the mantle required to crush or destroy the part B is as small as possible.
The core may be connected with the mantle in any suitable manner, such as, by being ressed thereinto.
When the projectile hits an armor plate the following action takes place: After the core has passed so far into the armor-plate that the mantle hits the armor-plate, the hollow part of the mantle will be crushed down or destroyed under the action of the kinetic e11- ergy of the mantle and in particular of the mantle-base B. A very slight portion only of the kinetic energy of the mantle is expend- Specification of Letters Patent.
Application filed April 16, 1907.
Patented July 13', 1909.
Serial No. 368,596.
ed for that purpose, as the wall of the hollow part of the mantle is thin and the base of the mantle is very heavy. The consequence is that the base of the mantle does not cease imparting energy to the core until the base itself or the shoulders I) of the part B hits the armor-plate. This, however, does not take place until the core has passed almost entirely into the armor-plate, and with normal dimensions of the plates, this means in most instances a complete penetration of the plate. The above-described formation of the projectile, therefore, causes the kinetic energy of the mantle to be utilized to the greatest extent for driving the core into the target.
Without departing from the scope of the invention, I may provide the hollow mantle part with longitudinal ribs 5'' (Fig. 2) or transverse ribs or the like, which serve to center the core in the mantle and at the same time make the mantle more capable of resistance during shipment or storing of the projectile. Moreover, the base and the hollow part of the mantle may be made separate and of dillerent materials. It is equally unimportant to the essence of the invention whether the projectile is fired with or without a cap. I
Having thus described my invention, what I claim as new therein and desire to secure by Letters Patent is:
1. A projectile comprising a core and a mantle composed of a solid base against which the core abuts and a hollow part surrounding the core and spaced there'l'rom throughout the greater part of its length; said hollow part being of a thickness permitting it to be crushed when theprojectile hits the target and said base having a weight of at least one fourth of the weight of the entire projectile to cause the hollow part to be crushed by the kinetic energy of the base on impact.
2. A projectile comprising a core, and a mantle composed of a solid base against which the core abuts and a hollow part surrounding the core said base having a weight of at least one fourth of the weight of the entire projectile.
3. A projectile comprising a core, a mantle composed of a solid base against which the core abuts and a hollow part surrounding the core and spaced therel'rom throughout the greater part of its length, and ribs connecting the core and the hollow part of the be destroyed by' the kinetic energy of the 10 mantle for centering the core in the mantle; base on impact.
said base having a Weight of at least one The following specification signed at Dus fourth of the Weight of the entire projectile. I seldorf, Germany, this thirtieth day of J anu= 4. A projectile comprising a core, and a ary, 1907. mantle having a destructible part surround- CARL GRUNWALD.
ing said core and a base having a Weight of at In presence of least one fourth of the Weight of the entire ALFRED POHLMEYER, projectile to cause said destructible part to I M. ENGELS.