Micro-adjustable case neck turning tool
OwnerKenneth E. Markleinventor
Life of this patent
Estimating the term…
Abstract
A micro-adjustable case neck turning tool which provides the mechanical capability for case neck trimming blade vernier driven vertical displacement adjustment and set in measured increments of 0.0002-inch and interpolated increments of 0.0001-inch for achieving consistent close tolerance trimming and trueing of the outside diameter of a cartridge case neck, thereby to uniformily undersize the same for close tolerance receiving and positioning thereof upon cartridge lock-up within a firearm chamber and thus increase the inherent cartridge factor accuracy by reducing substantially the potential for a mis-aligned angle of incidence in the bullet-to-bore relationship upon discharge delivery of a bullet from the case mouth into the firearm barrel.
Claims30
A micro-adjustable case neck turning tool wherein said tool has a tool body having a generally E-shaped configuration and mounted therein a slidably adjustable case mounting spindle adapted to insertably receive and support a cartridge case through the case neck opening thereof and position the same perpendicularly to a vertically adjustable case neck trimming blade adapted for trimming and trueing the outside diameter of a cartridge case neck wherein the improvement comprises a trimming blade adjustment means embodying two cooperatively operational threaded systems of differing threaded pitches to effect measured micrometer adjustment of a cutting edge of said trimming blade with respect to said case neck wherein a first of said two cooperatively operational threaded systems is comprised of a blade body threaded shaft and a complementary internal threaded bore axially aligned within an externally threaded micro-adjustment barrel and a second of said two cooperatively operational threaded systems is comprised of said externally threaded micro-adjustment barrel and a complementary tool body threaded opening therefor whereby said cutting edge of said trimming blade with respect to said case neck is slidably adjustable vertically within a conformingly shaped top E-leg blade channel of said tool body and is prevented from rotational movement thereby.
A micro-adjustable case neck turning tool wherein said tool has a tool body having a generally E-shaped configuration and mounted therein a slidably adjustable case mounting spindle adapted to insertably receive and support a cartridge case through the case neck opening thereof and position the same perpendicularly to a vertically adjustable case neck trimming blade adapted for trimming and trueing the outside diameter of a cartridge case neck wherein the improvement comprises a trimming blade adjustment means embodying two cooperatively operational threaded systems of differing threaded pitches to effect measured micrometer adjustment of a cutting edge of said trimming blade with respect to said case neck wherein a first of said two cooperatively operational threaded systems is comprised of a blade body threaded shaft and a complementary internal threaded bore axially aligned within an externally threaded micro-adjustment barrel and a second of said two cooperatively operational threaded systems is comprised of said externally threaded micro-adjustment barrel and a complementary tool body threaded opening therefor whereby said cutting edge of said trimming blade with respect to said case neck is slidably adjustable vertically within a conformingly shaped top E-leg blade channel of said tool body and is prevented from rotational movement thereby, and a case holding chuck means incorporating a compression spring biased shell holder and adapted to supportably retain said cartridge case during case neck trimming and trueing operations by said tool.
Dependencies are inferred from the claim text.