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

Claim 19:
20. 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; and
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 multiple circumferential channel portions in an internal surface of the jacket, and the protective window is configured with multiple circumferential protrusions arranged to fixedly engage into the multiple channel portions.