EP1424535A1 - Appareil de mesure et d'alignement pour munition - Google Patents

Appareil de mesure et d'alignement pour munition Download PDF

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Publication number
EP1424535A1
EP1424535A1 EP02258195A EP02258195A EP1424535A1 EP 1424535 A1 EP1424535 A1 EP 1424535A1 EP 02258195 A EP02258195 A EP 02258195A EP 02258195 A EP02258195 A EP 02258195A EP 1424535 A1 EP1424535 A1 EP 1424535A1
Authority
EP
European Patent Office
Prior art keywords
projectile
chamber
cartridge
concentricity
aligning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02258195A
Other languages
German (de)
English (en)
Inventor
Heinz Berger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP02258195A priority Critical patent/EP1424535A1/fr
Publication of EP1424535A1 publication Critical patent/EP1424535A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B35/00—Testing or checking of ammunition
    • F42B35/02—Gauging, sorting, trimming or shortening cartridges or missiles

Definitions

  • the invention refers to a device for measuring the concentricity of a projectile with respect to the case body of a cartridge, more particularly of a rifle cartridge.
  • the eccentricity is defined as the angle between the longitudinal axis of the projectile and the case. Ideally, i.e. in the case of perfect concentricity, this angle is equal to zero.
  • Known apparatus for controlling and correcting the concentricity of a cartridge i.e. essentially for aligning the projectile with respect to the case, only allow a rudimentary concentricity control and do not take account of the actual position of the cartridge in the cartridge chamber of a firearm.
  • the device comprises a main body having at least one chamber for the cartridge, the chamber includes means for retaining the cartridge by pressing it against a wall of the chamber such that the cartridge remains rotatable, and an access is provided through which a measuring means is capable of contacting the projectile of the cartridge, such that the concentricity of the projectile with respect to the case body is measurable in rotating of the cartridge.
  • the device essentially imitates the positioning of a rifle cartridge in the cartridge chamber in order to detect concentricity errors of the projectile of the cartridge with respect to its case.
  • excessive concentricity errors can be corrected by a correcting device.
  • the device is small and inexpensive in manufacture, thus making it suitable for universal applications and easy transport by the marksman.
  • the device is in the form of a hand-held tool.
  • a second aspect of the invention provides an alignment device arranged to exert a lateral pressure on a projectile of a cartridge inserted in a chamber of a device for evaluating the concentricity of the projectile with respect to a case body of the cartridge, the alignment device in use permitting the projectile to be aligned with respect to the case body and comprising:
  • FIGURE 1 shows the main body of a device according to the invention in a longitudinal section
  • FIGURE 2 shows a top view of the device of FIG. 1;
  • FIGURE 3 shows a side view of an improved aligning point
  • FIGURE 4 shows a view of the push piece according to arrow 51 in FIG. 3;
  • FIGURES 5-7 shows target diagrams
  • FIGURE 8 is a sectional view of a device according to an alternate embodiment of the present invention, wherein a portion of the main body includes an additional clearance for the cartridge.
  • the cylindrical main body 1 of the device is preferably made of a shock-resistant plastics material having good sliding properties.
  • Two cartridge chamber imitations 2 of different calibers are provided in the main body in the form of central longitudinal bores.
  • the cartridge chamber imitations 2 are so designed that cartridges 30 (smaller caliber) and 31 (larger caliber) inserted for concentricity control and adjustment project from the front sides of the main body 1 by a distance 33 that allows the manual rotation of the cartridges 30, 31 required for measuring and adjusting purposes.
  • a location bore 6 for a commercially available dial gauge 3 is provided in the main body 1 and extends transversally to the cartridge chamber imitations 2. Due to a close fit, the dial gauge 3 is self-adhesive in the location bore 6 but freely displaceable and freely rotatable in order to allow optimum readability.
  • Aligning device 4 includes a threaded bore 35 intended for aligning screw 37 is disposed coaxially opposite the location bore 6 of the dial gauge 3, the aligning screw 37 essentially consisting of handle portion 15 and a threaded spindle.
  • the position of the dial gauge 3 and of the aligning screw 37 in the main body 1 is such that the inserted cartridge 31 can be measured (measuring point 7 of the dial gauge 3) and aligned (spindle point 8) in the area of projectile point 39.
  • the difference between the minimum and the maximum reading of the dial gauge 3 during rotation of the cartridge 30, 31 will be used as a measure of the concentricity error. Since the dial gauge 3 measures the excursion of projectile 16 near its point, this value is approximately equal to the diameter of the circle described by the projectile point 39 during rotation of the cartridge 30, 31 around the longitudinal axis of the case.
  • the cartridge chamber imitations 2 in the main body 1 are designed with larger diameters than the respective cartridge, namely 1 to 2% larger than the theoretical case body diameter in area 13 of case body 73 and approx. 10% larger than theoretical case neck diameter B in area 14.
  • Throat 40 located between areas 13 and 14, serves as a rest for cartridge shoulder 71 and thus as a stop when inserting the cartridge 30, 31 in the cartridge chamber imitation 2.
  • Stepped bores 42 for compensators 9 are preferably provided on the side of the aligning screw 37 between the respective rear end of the cartridge chamber imitation 2 and the throat 40.
  • An opening in the present example in the form of a blind bore 5, extending towards the center of the main body 1 and located at the same height as the bores for the dial gauge 3 and the aligning screw 37, however offset therefrom, serves as a viewing window and allows an additional, but not indispensable, visual control of the measuring and aligning operations.
  • Aligning point 8 contains a seat 53 for a ball 55 to which a thrust plate 57 is affixed.
  • FIG. 4 shows a projection of the ball 55 and the plate 57 according to arrow 51 (FIG. 3). It is visible that the thrust plate 57 comprises an approximately cylindrical depression 59. in particular, the depression 69 may also be precisely adapted to the surface of the projectile 16 in the contact zone.
  • the measuring and aligning device 1 corresponds to the previously described embodiment.
  • the thrust plate 57 thus provides an enlarged engaging surface for the transmission of the aligning force to the projectile 16. Practical tests have shown that a deformation of the projectile 16 is excluded when this thrust point is used.
  • a further advantage of this embodiment of the aligning point consists in that the rotational movement now occurs between the ball 55 and the seat 53 in the aligning point, whereas the point rolls on the projectile surface in the simple embodiment.
  • the aligning device allows exertion of a lateral pressure on the projectile 16 in order to improve concentricity.
  • the cartridge 31 is inserted in the cartridge chamber imitation 2 of the corresponding caliber.
  • the dial gauge 3 is inserted in the bore 6 until the measuring point 7 contacts the point 39 of the projectile 16.
  • the projecting end 41 of the cartridge 31 is seized between thumb and index finger and rotated at least 360°, meanwhile determining the total deflection of the dial gauge 3, i.e., the difference between the minimum and the maximum reading of the measuring gauge.
  • the cartridge 31 is further rotated until the dial gauge 3 reaches the minimum reading that corresponds to the maximum deflection of the projectile point towards the aligning point 8.
  • Rotation of the aligning point 8 by means of the knob 15 will result in a pressure acting on the point 39 of the projectile 16, thereby deflecting it to such an extent that the point 39 of the projectile 16 remains laterally defected from its original position by half of the total deflection of the dial gauge 3 when the aligning point 8 is lifted off.
  • the aligning operation is then completed.
  • the device of the invention also allows the user to detect and single out cartridges whose case is deformed or damaged or whose total length excessively deviates from the ideal value due to a different setting depth.
  • FIGS. 5 to 7 illustrate the effect of the alignment of the cartridges 30, 31 by means of the device 1 of the invention.
  • the illustrations correspond to target diagrams obtained by firing a rifle fixed in a holding device on a distance of 300 m.
  • the inner target circle had a diameter of 50 mm.
  • FIG. 5 shows the diagram obtained with the cartridges 30, 31 having a concentricity error of 0.1 to 0.18 mm
  • FIG. 6 shows the target diagram obtained with a concentricity error of less than 0.1 mm
  • FIG. 7 shows the target diagram in the case of a concentricity error of no more than 0.03 mm.
  • the comparison of FIGS. 5 and 6 already shows a noticeable concentration of the hits in the target center, while FIG.
  • the throat 40 of the device 1 comprises a shoulder insert 61 and a groove 60 positioned within the device.
  • the groove 60 is manufactured with an enlarged diameter.
  • the enlarged diameter of the groove 60 permits the shoulder insert 61 to freely move radially within the device 1.
  • the contact point of the shoulder 71 of the case body 73 is centered upon the shoulder insert 61 through the existing radial play of the shoulder insert 61. Digressions in the total length of the cartridge 31 due to divergent projectile insertion depths can therefore be immediately identified through the readings from the dial gauge 3 and can be promptly sorted out from other cartridges.
  • the profile of the cartridge chamber imitation 2 within the device 1 is arranged such that the cartridge 31 inserted within the device 1, when pressed inward from the side by a compensator 9, only rests against the walls of the cartridge chamber imitation 2 within zones L1 and L3, with additional clearance in the L2 zone.
  • a different shape of the main body e.g. an essentially parallelepipedic shape
  • a measuring device other than a mechanical dial gauge, e.g., a gauge having a digital display and/or a signal or data output, e.g., for connection to a computer controlled measuring device;

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
EP02258195A 2002-11-28 2002-11-28 Appareil de mesure et d'alignement pour munition Withdrawn EP1424535A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02258195A EP1424535A1 (fr) 2002-11-28 2002-11-28 Appareil de mesure et d'alignement pour munition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02258195A EP1424535A1 (fr) 2002-11-28 2002-11-28 Appareil de mesure et d'alignement pour munition

Publications (1)

Publication Number Publication Date
EP1424535A1 true EP1424535A1 (fr) 2004-06-02

Family

ID=32241348

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02258195A Withdrawn EP1424535A1 (fr) 2002-11-28 2002-11-28 Appareil de mesure et d'alignement pour munition

Country Status (1)

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EP (1) EP1424535A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2353150A (en) * 1943-04-23 1944-07-11 Thomas J Dietz Bullet spinning machine
CH687479A5 (de) * 1993-12-07 1996-12-13 Ulrich Eggenberger Vorrichtung zum Ueberpruefen der Zentrierung.
CH688388A5 (de) * 1993-05-13 1997-08-29 Karl Sutterlin Mechanische Wer Einrichtung zum Pruefen und Richten von Gewehrpatronen.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2353150A (en) * 1943-04-23 1944-07-11 Thomas J Dietz Bullet spinning machine
CH688388A5 (de) * 1993-05-13 1997-08-29 Karl Sutterlin Mechanische Wer Einrichtung zum Pruefen und Richten von Gewehrpatronen.
CH687479A5 (de) * 1993-12-07 1996-12-13 Ulrich Eggenberger Vorrichtung zum Ueberpruefen der Zentrierung.

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