US1900159A - Ammunition - Google Patents

Description

A. CAMPBELL March 7, 1933.

AMMUNITION Filed May 23, 1931 W m m m m (ZMa/n (760/10 BY :2 Q. .1

A TTORNEYS.

of the base 10 engages the Wall Patented Mar. 7, 1933 UNITED STATES PATENT OFFICE TO REMINGTON ARMS COMPANY, IN 0., A CORPORATION OF DELAWARE AMMUNITION Application filed May 23,

This invention relates to anvils for ammunition primers, and embodies the discovery of a rinciple of anvil construction by the use of which the eificiency, sensitiveness and reliability are greatly increased.

In the drawing: Fig. 1 is a fragmentary sectional elevation of a cartridge provided with an anvil according to the present invention.

lFig. 2 is an enlarged plan view of the anv1 Fig. 3 is an enlarged side view of the anvil. Fig. 4-. is an enlarged sectional elevation of the anvil.

The function of an anvil is to provide a rigid body to receive the blow of the firing pin and to cause this blow to ignite the priming mixture by the sudden application of pressure and friction to the part of the priming mixture between the anvil and the firing pin. Anvils are of various shapes but generally comprise a section of small area which projects toward or is embedded in the primmg mixture in position to receive the blow of the firing pin.

The present invention comprises the discovery of a feature of anvil construction which greatly increases its efiiciency, particularly in the matter of insuring priming mixture ignition under the impact of a comparatively light blow. Said anvil is of generally hollow conical form. It comprises a base portion 10 of substantially cylindrical exterior configuration, the periphery of the cylinder being interrupted by oppositely disposed openings or flash passages 11. Above the base 10 isa section 12 of conical exterior and interior shape, and the apex of the cone is provided with a projection 13 adapted to extend toward or be embedded in the priming mixture 14 in the base of a primer cup 15, as shown in Fig. 1. The periphery of cup 15 to assist in holding the anvil in place. Associated with the projection 13 are one or more outwardly extending ridges or ribs 16. Through the greater part of their length the ridges are of substantially V-cross-section, their upper ends merge with the end of proportions merge jection 13 and their lower 1931. Serial No. 539,515.

with the conical surface 12. 'When the anvils are used in the manner illustrated in Fig. 1 a substantial part of the ridges is embedded in the priming mixture. It has been found that the provision of such ridges greatly increases the eflectiveness of the anvil, insuring the prompt ignition, under a comparatively light blow, of even diflicultly ignitable mixtures. These results may be due to the increased confinement of and friction upon the part of the priming mixture which is disturbed by the blow of the firing pin, but any theoretical explanation is incapable of proof, inasmuch as a successful test destroys the mixture.

Without departing from the spirit of the invention numerous variations may be made in the style and proportions of the anvil, the primer cup and other components of the cartridge or shell.

What is claimed is:

1. An anvil comprising an exteriorly cylindrical base, a conical body above said base, a projection at the apex of said conical bod and spaced ridges extending laterally from said projection.

An anvil comprising a hollow substantially conical body, a projecting point at the apex of said body, and a plurality of ridges projecting outwardly from the periphery of said point and merging with said point and said conical body.

3. A cartridge comprising a primer cup, an anvil in said cup comprising a substan tially cylindrical base having its periphery in contact with the wall of said cup, a point on said anvil projecting toward the base of said cup, and substantially V-shaped ridges projecting laterally from said point.

ALLAN CAMPBELL.

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