Stress modulator ring and microgrooved base for an ammunition cartridge having a plastic case
First Claim
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1. An ammunition cartridge comprising:
- (a) a cylindrical base having a plurality of grooves around the periphery thereof;
(b) a cylindrical plastic member having a portion thereof disposed around said grooves in said base; and
(c) a stress ring surrounding said plastic member in the area of said grooves to modulate the stress in said plastic, said grooves comprising means for relieving substantially all of the plastic member stress produced by said stress ring, whereby said plastic member is a stress relieved plastic member.
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Accused Products
Abstract
An ammunition cartridge has a plastic case and a metal base having a plurality of grooves around the periphery thereof. The plastic case has an interference fit with the base. The plastic creeps into the grooves after being interference fit over the base to relieve the stress in the plastic. A stress modulator ring surrounds the plastic member in the area of the grooves.
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Citations
17 Claims
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1. An ammunition cartridge comprising:
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(a) a cylindrical base having a plurality of grooves around the periphery thereof; (b) a cylindrical plastic member having a portion thereof disposed around said grooves in said base; and (c) a stress ring surrounding said plastic member in the area of said grooves to modulate the stress in said plastic, said grooves comprising means for relieving substantially all of the plastic member stress produced by said stress ring, whereby said plastic member is a stress relieved plastic member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An ammunition cartridge of the type having a base and a plastic member attached to the base comprising:
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(a) a cylindrical base having a plurality of grooves around the periphery thereof, said grooves being separated by sharp points for inducing the cold flow of plastic; (b) a cylindrical plastic member having a portion thereof disposed around said grooves; and (c) stress ring means surrounding said plastic member in the area of said grooves for providing an initial compressive force to said plastic member, said initial compressive force and said points inducing the cold flow of plastic member material into said grooves, said grooves providing a free volume sufficient to contain said plastic member material so induced to cold flow, whereby said plastic member is a substantially stress free plastic member. - View Dependent Claims (16, 17)
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Specification