US2823458A - Cartridge gauge - Google Patents

Description

Feb. 18, 1958 E. M. ZABLOUDIIL 2,823,458 H CARTRIDGE GAUGE Filed March 12, 1954 INVENTOR. EDWAED ZABLOUD/L,

s'yfmmjpmawz w 0m This invention rela'tes to cartridge--g'auges.

An 1object' of the invention is -tosprovide aniintproved gauge for comparing the length of a cartridge case and the overall length of a loaded cartridge with standards and for indicating the depth to which a bullet is seated in a cartridge case, in order that too deep or too shallow seating may be corrected. If loaded too deeply, a bullet takes up precious air space in a cartridge and when fired has to jump or move ahead before it engages the rifling of the barrel of the gun, with a certain resultant loss in the accuracy of the shot. If the seating is too shallow, the bullet is likely to be jammed in the rifiing of the barrel and, should it become necessary to remove a bullet unfired, it is likely to stick in the barrel and require the application of a ramrod.

Another object of the invention is to provide a cartridge gauge which is of simple and inexpensive construction, which is easy to use, and which will accurately indicate variations from standard length and seating of cartridges tested with the gauge.

Other objects and advantages of the invention will appear from the following description considered in conjunction with the attached drawing, in which:

Figure 1 is a plan view of a gauge of the present invention.

Figure 2 is an end elevational view of the assembly of Figure 1.

Figure 3 Figure 1.

Figure 4 is a view taken along the line 4-4 of Figure 3.

Figure 5 is a view taken along the line 5-5 of Figure 2.

Referring now to the drawings in more detail, the illustrated device comprises a base 1, fabricated of metal, wood, or other rigid material, in the form of a channel bar positioned with the open side downward. A dovetailed tongue 2 extends longitudinally along the upper surface of the base 1 and is formed integrally therewith. A cylindrical bore 3, enlarged at its upper end, extends vertically through the base 1 and the tongue 2 for receiving and countersinking a screw to fasten the base 1 to a bench or other support.

An upstanding abutment plate 4 is positioned on one end of the base 1 and fixedly connected thereto. Specifically, the plate 4, of metal, wood, or other rigid material, has its lower portion fixed to one end of the base 1 by means of the machine screws 5 and has its upper portion extending upwardly from the upper surface of the tongue 2.

Also positioned upon the base 1, is a block 6 which is mounted on the base for sliding movement thereon toward and away from the plate 4, the under portion of the block 6 being provided with a dovetailed groove 7 which slidably receives the dovetailed tongue 2. The block 6 is provided with a longitudinal bore 8 extending therethrough. Inserted within the bore 8 is a bushing 9 having a smaller and accurately machined bore 10. The bushing 9 is positioned within the bore 8 so that one end of the bushing 9 is flush with the face of the block 6 adjacent the plate is a side elevational view of the assembly of "4. ":The bore il fli-isladapted tozreceivexto Ia predeterrnined distance thzsniall'er' erid 6f the pointed 'end' of a bullet sinserteditlierin; theibore .10 being accurately-formed =to ihave ardiarneterxinialrsto the:diarneter of the pointed end :bfia bulieu'zofitlre rcaliberizto be tested ion the gauge, :at a apretletermined point 'iiiterrn'edi'ate its ends. The zpred'erterminedipoint will be aconstant-distance from the :base iofittheg: cartridge tease .in lfwhich the -bullet is inserted, iif ithe 'ibullet lis preper l rseated itlie case.

Means upon the block 6 co ct with' means upon' ithe tba's :1 .toiiindi'cate selectivelya-comparison "with respecf'ti ve rst'andards fiofitheril'ength o a cartridge ca e, or the overalleflengthuorathtdepth o seating of a loaded carntridg easui'edainthe g'a'u'ge. iTli'e rneans consists of an uprigh ine m'nnankedfori onezsideqo the bas'e-lfand-exztending'std ithe upper tedge zthereofzarrd threem right- Jines 12, 13 and 14 marked upon the complemental side of the block 6 and extending to its juncture with the base 1. The lines are so positioned along the base 1 and block 6 that if the block 6 is moved on the base 1 to bring the line 14 into alignment with the line 11, the distance between the facing surfaces of the plate 4 and the block 6 will be exactly equal to the standard length of the cartridge case of cartridges of the caliber for which the gauge is intended, if the line 12 is brought into alignment with the line 11, the distance between the facing surfaces will be equal to the standard overall length of a loaded cartridge of the pertinent caliber, and if the line 13 is aligned with the line 11, the distance between the facing surfaces will be equal to the distance between the base of the cartridge and the point upon the pointed end of the bullet at which the diameter of the bullet equals the diameter of the bore 10.

To use the gauge of the present invention to determine whether a bullet is properly seated in a cartridge case, the cartridge is positioned, as shown in the broken lines in Figure 5, with the base of the case against the plate 4 and the point of the bullet extending into the bore 10. The block 6 is then moved toward the plate 4 until the bullet lodges in the bore 10 at the point where the diameter of the bullet equals the diameter of the bore, as shown in broken lines in Figure 5. If the bullet is properly seated, the line 13 should now be in alignment with the line 11. If the line 13 is nearer the plate 4 than the line 11, the bullet is too deeply seated. If the line 13 is farther from the plate 4 than the line 11, the bullet is not deeply enough seated. In either case the improper seating is indicated in direction and amount and appropriate steps can be taken to correct it.

By a similar method the gauge may be used to compare the length of a cartridge case, or the overall length of a loaded cartridge with appropriate standards. In the latter uses, however, the open end of the case, or the pointed end of the bullet is placed against the face of the block 6 rather than in the bore 10 and the positions of the lines 14 and 12 respectively with respect to the. line 11 indicate the results of the comparison.

The gauge of the present invention may be adapted for use with cartridges of different calibers by the substitution of blocks 6 provided with bores 10 of appropriate diameters and side markings 12, 13 and 14 appropriately positioned for the gauging of other calibers. The same base 1 may be used for all calibers.

What is claimed is:

1. In a cartridge gauge, a base having a top, a block shorter than the base, means mounting said block on the top of the base for longitudinal sliding movement along the base, an abutment plate fixed on and rising above the top of the base, said block having an end facing and longitudinally aligned with and spaced from said abutment plate, and a longitudinal bushing mounted on said block, said bushing having a bore of a diameter to receive therein the point of a bullet of a cartridge having its other end engaged with the abutment plate.

2. In a cartridge gauge, a base having a top, a block shorter than the base, means mounting said block on the top of the base for longitudinal sliding movement along the base, an abutment plate fixed on and rising above the top of the base, said block having an end facing and 10hgitudinally aligned with and spaced from said abutment plate, and a longitudinal bushing mounted on said block, T'-

, shorter than the base, means mounting said block on the top of the base for longitudinal sliding movement along the base, an abutment plate fixed on and rising above the top of the base, said block having an end facing and longitudinally aligned with and spaced from said abutment plate, and a longitudinal bushing mounted on said block, said bushing having a bore of a diameter to receive therein the point of a bullet of a cartridge having its other end engaged with the abutment plate, said base and block having complementary sides, a vertical gauging line on the side of one of said base and block, and a vertical indicator line on the other for selective registry with the gauging line.

References Cited in the file of this patent UNITED STATES PATENTS 933,992 Ketchum Sept. 14, 1909 1,127,955 Berthold Feb. 9, 1915 1,375,747 Zigray -n Apr. 26. 1921 2,444,136 Leasure June 29, 1948 2,465,791 Daoust Mar. 29, 1949 2,585,521 Wandrus Feb. 12, 1952 FOREIGN PATENTS 471,111 Germany Feb. 6, 1929

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