Firearm barrel inner diameter testing assembly
AssigneeColt's Manufacturing Company Inc.
InventorRobert M. Gancarz
Life of this patent
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Abstract
An assembly for testing the inner diameter of a rifled barrel of a firearm and a method of manufacturing the same. The assembly has a frame with side air discharge apertures and is intended to be connected to an air gauge. The assembly has a timing sleeve that is removably mounted to the frame such that the sleeve can be replaced when it becomes worn or when the assembly is intended to be used with a barrel having a different type of rifling. The assembly also comprises a wear ring such that the wear ring and timing sleeve absorb abrasive contact in the barrel to reduce abrasive contact by the barrel on the frame.
Claims9
An air spindle assembly for use with an air gauge for measuring a bore diameter of a rifled barrel of a firearm having lands and gloves, the spindle assembly comprising:
- a frame having a tube with an air supply conduit therein and an end member fixedly connected to said tube, said end member having an air distribution conduit therein connected to said air supply conduit and having at least two opposite discharge apertures;
- a timing sleeve removably mounted to said end member, said sleeve having an outer profile substantially the same as an inner profile of a section of the rifled barrel being measured;
- and
- means for stationarily, but removably mounting said sleeve to said end member such that said timing sleeve can orientate said frame in the barrel being measured with said discharge apertures substantially centered upon the lands of the barrel to obtain accurate measurements along the length of the barrel and, upon excessive wear of said timing sleeve, said sleeve can be removed and replaced with a new timing sleeve.
Dependencies are inferred from the claim text.