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
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
  • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
  • G01L5/14—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force of explosions; for measuring the energy of projectiles

Definitions

• the object of the present invention is therefore to provide a device for measuring the gas pressure of cartridges, which is suitable for private use and enables the "hand loader" to easily check the self-loading cartridges and at the same time can be purchased at a reasonable cost.
• the device according to the invention also consists of only a few individual parts, so that production with a comparatively low cost is possible.
• the device according to the invention is also dimensioned relatively small, has a relatively low weight due to the preferably used duralumin alloy or similar alloys and is portable. Further advantages of the invention result from the following detailed description.
• FIG. 1 shows a longitudinal section through a gas pressure measuring device according to the invention.
• Figure 2 is an enlarged vertical section through the gas pressure measuring device according to the invention along the line II-II of Fig. 1.
• FIG. 3 shows a further longitudinal section through part of the gas pressure measuring device according to FIG. 1 on an enlarged scale.
• the device according to the invention for measuring the gas pressure of cartridges has an essentially cylindrical housing body 10 made of high-strength duralumin, which is flattened at the top and bottom and which is arranged on a base plate 13.
• this housing body 10 has a stepped bore 12b, 12a tapering in the weft direction, into which a measuring run ⁇ , which is correspondingly stepped, can be inserted in the axial direction.
• the cartridge 16 with the projectile 15 and propellant charge 17 is introduced into the bore 14 of the measuring barrel 11.
• a bore closes in the axial direction in the housing body 10 towards the rear
• Internal thread 25a the nominal diameter of which is designed to be somewhat larger and, for example, is approximately 50% larger than the diameter 12b of the measuring barrel root.
• This area of the threaded bore 25 a should extend approximately over 25% of the axial length of the entire housing body 10.
• a thread of a comparatively simple closure body 25 can be screwed into the rear threaded bore 25a of the housing body 10.
• This closure body is preferably also made of duralumin F 52 and has an internal firing pin as an ignition device, which is movable in the axial direction and which strikes the cartridge 16 inserted into the barrel bore 14.
• the closure piece 25, a rotationally symmetrical, elongated hollow body is inexpensive to manufacture as a pure turned part.
• the front threaded portion 25a of the closure piece continues rearward in a cylindrical portion 25b with a reduced outside diameter.
• a head piece 26 which is initially somewhat reduced in diameter compared to the closure piece, but which has a conical thickening 28 in its rear region, which in turn is followed by a cylindrical section 27 of the head piece with a larger diameter.
• a type of groove results between the conical thickening 28 of the head piece and the cylindrical area 25 of the closure piece in the area of the reduced diameter 26 of the head piece.
• the head piece 26 is firmly connected to the firing pin 33 located inside the locking piece 25.
• the tension lever 23 can be folded in the direction of the arrow, the lower, approximately U-shaped, tension bracket 23 a of the tension lever sliding over the inclined surface of the conical extension 28, first pulling the head piece 26 out by a few millimeters and then finally End of the head piece 27 releases, so that the firing pin strikes the cartridge 16 by the spring force and ignites the propellant charge 17.
• the structure of the closure piece 25 is clearer from the enlarged view of FIG. 3.
• the cylindrical portion 25b of the closure piece 25 axially movably receives the firing pin 33, the Firing pin 33 is received in its rear section with a smaller cross section in a sleeve 35 with an L-shaped cross section.
• This sleeve 35 is surrounded by a compression spring 36, for the rear end of which the clamping nut 37 serves as an abutment.
• the firing pin 33 has a narrow tip 33a at its front end which strikes the cartridge.
• the compression spring 36 is tensioned by pulling back the head piece 26, 27.
• the measuring process of the gas pressure measuring device according to the invention is subsequently explained with reference to FIG. 2.
• the measuring barrel 11 has a radial bore 30 in its rear section, which has an enlarged outer diameter, which lies at the level of the inserted cartridge to be measured, and which is connected to the inside of the barrel bore 14 of the measuring barrel 11.
• the gas pressure then acts through the radial bore 30 on the shaft of a measuring piston 19, which is arranged in a measuring cylinder 18 so that it can move upwards - i.e. radially with respect to the measuring run - with the head 32 of the measuring piston 19 on a shoulder of the inner bore in the idle state of the measuring cylinder 18 is present.
• a bushing 21 with an internal thread is inserted into a radial threaded bore of the housing body 10, which in turn has a flange 34 on which the upper end of the measuring cylinder 18 is held.
• Internal thread 21a of the threaded bushing has a knurled screw 22 screwed in, so that the radial bore 30 is closed to the outside.
• a compression body 29 made of copper or the like.
• the knurled screw 22 can also be a turned part made of dural. Due to the gas pressure of the explosion when the projectile is fired, which propagates through the radial bore 30, the head 32 of the measuring piston 19 is pressed upward and the compression body 29 is compressed. The degree of compression of the compression body 29 then indicates the gas pressure when firing, this connection can z. B. be readable from a table. With the help of the structurally simple gas pressure measuring device according to the invention, which consists of a few parts that can be manufactured with little effort, the gas pressure of cartridges can thus be determined in a simple manner.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Measuring Fluid Pressure (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6407157

Family Applications (1)

Country Status (2)

Cited By (3)

Family Cites Families (3)

• 1991
  • 1991-05-23 DE DE91DE9100429T patent/DE4191260D2/de not_active Expired - Lifetime
  • 1991-05-23 WO PCT/DE1991/000429 patent/WO1991019156A2/de active Application Filing

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