[특허]Practice projectile with variable range

Pocal Industries, Inc.

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특허 상세정보

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내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Practice projectile with variable range

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F42B-013/20
미국특허분류(USC)	102/498; 102/445; 102/529
출원번호	US-0537121 (1983-09-29)
발명자 / 주소	Jensen, Jens C.
출원인 / 주소	Pocal Industries, Inc.
대리인 / 주소	Markva, Neil F.
인용정보	피인용 횟수 : 21 인용 특허 : 3

초록
▼

The practice projectile of this invention has a variable projectile range when fired from the barrel of a firearm. The projectile comprises a shell body portion having a front end section and a rear end section and includes an outer surface, an inner gas-conveying passage, propellant gas ingress openings and propellant gas exit openings. The outer surface includes an outer, caliber section which contacts the inside surface of the barrel out of which the projectile is fired. The outer caliber section is located intermediate the front and rear end sections. The inner gas-conveying passage extends between the front end and rear end sections. The propellant gas ingress openings are located in the rear end section and openly connect the rear end section of the inner gas-conveying passage to the outside of the shell body. The propellant gas exit openings are located in the front end section and openly connect the front end section of the inner gas-conveying passage to the outside of the shell body. Upon firing of the firearm, the shell body is effective to direct resultant propellant gases to move through the propellant gas ingress openings, forwardly along the inner gas conveying passage and out the propellant gas exit opening.

대표
청구항
▼

1. In a practice mortar shell having a shell portion, a fuse portion and a finned tail portion for firing from the barrel of a firearm, the combination comprising: (a) the shell body portion having a front end section and a rear end section and including an outer surface, an inner gas-conveying passage, propellant gas ingress aperture means and propellant gas exit aperture means, (b) the outer surface including an outer, caliber section which contacts the inside surface of the barrel out of which barrel the shell is fired, (c) the outer caliber section is located intermediate the front and rear end sections, (d) the inner gas-conveying passage extends inside the shell body portion between the front end and rear end sections, (e) propellant gas ingress aperture means are located in the rear end section behind the outer, caliber section and openly connect the rear end section of the inner gas-conveying passage to the outside of the shell body portion immediately upon firing of the firearm, and (f) the propellant gas exit aperture means are located in the front end section ahead of the outer, caliber section and openly connect the front end section of the inner gas-conveying passage to the outside of the shell body portion, (g) upon firing of the firearm, said shell body being effective to direct propellant gases immediately upon firing to move from outside the shell body portion into and through the propellant gas ingress aperture means, forwardly within the shell body portion along the inner gas-conveying passage and out the propellant gas exit aperture means for controlling the overall projectile range of the mortar shell, means, (h) the exit aperture means having an opening with a sufficient amount of area compared to the area of the ingress opening means to avoid damage in pressure build-up inside the shell body. 2. A shell as defined in claim 1 wherein the ingress aperture means includes a plurality of openings disposed at preselected locations along the circumference of the shell body portion. 3. A shell as defined in claim 2 wherein the propellant gas ingress aperture means includes plug means for closing the openings. 4. A shell as defined in claim 3 wherein the plug means includes plug members individually shaped to separately and independently close each of the plurality of openings, whereby the range of a projectile incorporating said shell portion is shortened for each plug member which is removed from an opening to unplug the said opening thereby allowing the propellant gas pressure to be released through the gas-conveying passage and out of the propellant gas exit opening. 5. A shell as defined in claim 4 wherein the plug members include donut-shaped sections which simulate the shape of the donut-shaped charge members used to propel fin-stabilized projectiles. 6. A shell as defined in claim 4 wherein the plug members include individual, formed plug sections shaped to fit the profile of the propellant-gas ingress openings. 7. A shell as defined in claim 2 wherein the finned tail portion includes an end fin section and an auxiliary charge holding section effective to contain a plurality of charges to simulate an actual fin-stabilized projectile, the opening area of the exit aperture means being in a predetermined ratio with respect to the opening area of the ingress aperture means, so that the area of the ingress openings is effective to provide a predetermined measured projectile range. 8. A shell as defined in claim 1 wherein the exit aperture means has an opening area of a minimum of 3 times the opening area of the ingress aperture means. 9. A shell as defined in claim 1 wherein the shell body portion is disposed between a fuse portion located at said front end section and a tail portion located at said rear end section, the fuse portion includes a detonating signal charge section which extends into the gas-conveying passage of the shell body portion, the exit and ingress aperture means each has an opening area and the ratio between the exit and ingress opening areas is effective to preclude pressure build-up within the shell body for preventing damage to the detonating signal charge section and is effective to allow the total opening area of the ingress opening areas to govern the muzzle velocity of the shell. 10. A shell as defined in claim 1 wherein the ingress aperture means includes three openings and plug means for closing each of the openings separately and independently with respect to each other, the exit aperture means includes an opening area that is greater than the total area of all of the ingress openings by an amount sufficient to prevent pressure build-up within the gas-conveying passage. 11. A shell as defined in claim 10 wherein the ratio of the area of the exit openings with respect to the area of the ingress openings is a minimum of 3 to 1. 12. A shell as defined in claim 11 wherein the shell body portion is disposed between a fuse portion located at said front end section and a tail portion located at said rear end section, there is a single ignition charge located in the tail portion. 13. A shell as defined in claim 1 wherein: the shell body portion is disposed between a fuse portion located at said front end section and a tail portion located at said rear end section, the tail portion includes a first ignition propellant charge on the inside thereof and an outside surface section for carrying a preselected number of incremental propellant charge members, said ingress aperture means includes an opening area effective to provide a preselected projectile range when using any combination of the propellant charges. 14. A shell as defined in claim 13 wherein the preselected projectile ranges for firing the projectile with the propellant charges is as follows: first ignition propellant charge only--about 250 meters one additional incremental charge--about 300 meters two additional incremental charges--about 400 meters three additional incremental charges--about 500 meters four additional incremental charges--about 600 meters.

이 특허에 인용된 특허 (3)

이 특허를 인용한 특허 피인용횟수: 21

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특허 상세정보

Practice projectile with variable range

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청구항
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이 특허에 인용된 특허 (3)

이 특허를 인용한 특허 피인용횟수: 21

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Practice projectile with variable range

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이 특허에 인용된 특허 (3)

이 특허를 인용한 특허 피인용횟수: 21

IPC 상위 출원인

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IPC 상세정보(version : 201201)

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