Patent ID: 11965722
Assignee: BAE SYSTEMS PLC
Field: Other special machines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 18:
19. A non-incendiary tracer projectile structure for housing an electrically powered illumination source, the tracer projectile structure comprising:
a jacket comprising a forward end and a rearward end defining a rear opening;
a protective window within the jacket and that is transparent to a selected electromagnetic wavelength emitted by the electrically powered illumination source;
an internal retaining structure disposed towards the rearward end of the jacket to support the protective window, wherein a portion of the rearward end of the jacket tapers in a radially inward direction to define a circumferential narrowing of the rear opening, wherein the internal retaining structure comprises a circumferential channel in an internal surface of the jacket or a circumferentially continuous collar on an internal surface of the jacket, and the protective window is in the channel or on the collar; and
a seal to adhere the protective window to an inner surface of the jacket.