US3349712A - Sabot projectile - Google Patents

Sabot projectile Download PDF

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Publication number
US3349712A
US3349712A US566850A US56685066A US3349712A US 3349712 A US3349712 A US 3349712A US 566850 A US566850 A US 566850A US 56685066 A US56685066 A US 56685066A US 3349712 A US3349712 A US 3349712A
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US
United States
Prior art keywords
projectile
sabot
recess
projectile body
shearing
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.)
Expired - Lifetime
Application number
US566850A
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English (en)
Inventor
Schwager Oskar
Engel Walter
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.)
OC Oerlikon Corp AG Pfaeffikon
Original Assignee
Oerlikon Buehrle Holding AG
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Filing date
Publication date
Application filed by Oerlikon Buehrle Holding AG filed Critical Oerlikon Buehrle Holding AG
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Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B14/00—Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
    • F42B14/06—Sub-calibre projectiles having sabots; Sabots therefor
    • F42B14/064—Sabots enclosing the rear end of a kinetic energy projectile, i.e. having a closed disk shaped obturator base and petals extending forward from said base

Definitions

  • the invention relates to a sabot projectile of the kind in which a sabot is connected to a base surface of a projectile -body by means of a connecting piece projecting over the base surface, which connecting piece, on discharge, owing to the load due to the inertia of the projectile body, is sheared off and causes severance of the connection.
  • the invention overcomes the abovesaid disadvantages in that it provides a sabot projectile consisting of a projectile body having a base surface at one end, a discshaped connecting piece secured to the base surface by means of a bonding substance and constituting a rim extending circumferentially beyond the base surface, a sabot having the form of a sleeve in which the projectile body is received and which is closed atits rear end by a Wall portion, a ring surface forming an inner surface part of the end wall portion and dening a circular recess in the said end wall, the said ring surface co-axially seating against the rim of the connecting piece and further defining a circular shearing edge around the periphery of the recess which edge shears through the connecting piece 3,349,712 Patented Oct. 3l, 1967 ICC projectile is discharged due to the inprojectile body causing the said body to enter when the sabot ertia of the the recess.
  • FIGURE 1 shows a first embodiment of a sabot projectile in longitudinal section and partial elevation
  • FIGURES 2 and 2a show a greatly enlarged broken longitudinal section of the rear part of the Sabot projectile shown in FIGURE l, with section part A in FIG. 2 showing the sabot projectile in the condition prior to loading, and section part B in FIG. 2a showing the sabot projectile after discharge on passing through a gun barrel (not shown),
  • FIGURES 3 and 3a are a representation corresponding to FIGURES 2 and 2a of a second embodiment
  • FIGURES 4 and 4a1 are a representation corresponding to FIGURES 2 and 2a, of a third embodiment
  • FIGURES 5 and 5a are a representation corresponding to FIGURES 2 and 2a, of a fourth embodiment.
  • FIGUR-ES 6 ⁇ and 6a are a representation corresponding to FIGURES 2 and 2a of a lifth embodiment.
  • the sabot is marked 10 and the projectile body 11.
  • the sleeve-shaped sabot of light metal such as aluminium alloy, ts with its rear part into the mouth of a cartridge case (not shown), in a known manner, until discharge.
  • the projectile body 11, preferably wholly or in part consisting of tungsten carbide, is cylindrical in shape and is supplemented by a leading point 21 and a short projectile body boat-tail 110, which is in the form of a truncated circular cone.
  • the steel driving band 12 is secured to the sabot ⁇ 10 and transmits to it the spinning impulse from the grooves in the gun barrel (not shown).
  • Another similar driving band 13 is arranged at the front part of the sabot 10. In order to save weight, the outside diameter of the sabot 10 lying between the two driving bands 12 and 13 is of smaller diameter than the base portion.
  • the front cylindrical hole 101 in the sabot 10 serves to centre and guide the projectile body 11.
  • This hole 101 opens out, forming a shoulder 103, into a coaxial hole 102 of larger diameter, formed in the base of the sabot 10, the rear portion of which carries a screw thread.
  • a screw-in body 15, with a recess 16 in it, is fitted into this screwed portion of the sabot 10 from the rear.
  • the disc-shaped connecting piece 14 which is secured to the projectile base surface 111.
  • FIGURES 2 and 2a show, in a first embodiment of the invention, the details of securing the projectile body 11 to the sabot 10.
  • a disc-shaped connecting piece 14a made of brass ⁇ or steel for example, is securely connected by hard soldering, by means of a layer of hard solder 24, to the truncated circular cone which forms the boattail of projectile body 11, or to its end face presenting the base surface 111.
  • the part of the disc 14a hereafter called the shearing rim 141, projecting beyond the diameter of the base surface 111 and the projectile body 11, bears against the ring-shaped front surface 151 of the screw-in body Iand is pressed by the latter against the shoulder 103 of the sabot 10 formed by the joint between the two holes 101 and 102.
  • a recess 16a is formed, bounding a truncated cone-shaped space, contracting towards the rear, the base 16-1a of which is arranged parallel to the rear end surface 143a of the disc 14a, therefore at right angles to the projectile axis.
  • the line of intersection of the front surface 151 with the generated surface 16211 of the recess 16a forms an edge which will hereafter be called the shearing edge 152.
  • Its diameter is at least as great as the diameter of the base surface 111 of the projectile body 11.
  • generatrices of the truncated cone of the projectile body boat-tail 110 and the generated surface 162a of the recess 16a essentially form an angle of the same size with the longitudinal axis of the projectile. It must, however, be greater than the angle at which jamming in regard to separation of the two cones in the axial direction occurs through friction.
  • the height of the projectile body boat-tail 110 is, moreover, at least equal to the thickness of the shearing rim 141 of the disc 14a. In the case of this version (FIG- URES 2 and 2a) the height is for example, 1.4 times this thickess.
  • the distance of the base 161a of the recess 16a from the rear end surface 143a of the disc 14a which in this example is the same as the depth of the recess 16a, is so dimensioned that it is at least equal to the thickness of the shearing -rim 141, but at most equal to the height of the cone-shaped projectile body boat-tail 110. In the case of the above version, it is equal to half the surn of the height of this projectile 4body boat-tail 110 and the thickness of the shearing rim 141.
  • FIGURES 3 and 3a and 4 and 4a differ from the previously described embodiment as shown in FIGURES 2 and 2a, in that the disc-shaped connecting piece secured to the projectile body boattail 110 is formed by the disc 14a, containing the shearing rim 141 and, superimposed coaxially on its rear side, a truncated cone 152a or 142b, tapering to the rear, combined into one body with the disc 14a.
  • the base surface of the truncated cone 142er has a diameter which, in the case of the sabot projectile shown in FIGURES 3 and 3a, is the same size as, and with the truncated cone 142b shown in FIGURES 4 and 4a is smaller than, the diameter of the shearing edge 152 of the screw-in -body 15.
  • the depth of the recess 16b is here determined, following the example of the rst embodiment in FIGURES 2 and 2a, by the requirement that the distance of its base 151b from the rear end surface 143b of the truncated cone 142a or 1,4211 is at least equal to the thickness of the shearing rim 141, but at most equal to the height of the coned projectile body boat-tail 110. In the two embodiments shown in FIGURES 3 and 3a and 4 and 4a this distance is equa-l to half the sum of the projectile body boattail 110 and the thickness of the shearing rim 141.
  • angles of inclination of the generatrices of the truncated cone 14211 or 142b and the .recess 16b in relation to the base surface 111 of the projectile body are the same size.
  • FIGURES 5 and 5a Unlike the version as in FIGURES 2 and 2a, in which the front face of the shearing rim 141 lies in the same plane as the projectile base surface 111, in FIGURES 5 and 5a a truncated cone 147, widening to the front, is mounted on the front face of the disc-shaped connecting piece on the disc 14a containing the shearing rim 141, forming one piece with the disc 14a.
  • the front end surface of this truncated cone is, as in the foregoing embodiments, secured to the projectile base surface 111 by a hard solder layer 24.
  • the rear end surface of this truncated cone 147 forms the transition surface to the disc 14a and has a diameter which is at most equal to the diameter of the shea-ring edge 152..
  • the height of this truncated cone 147 is at least equal to the thickness of the shearing rim 141 and its cone angle is essentially the same as that of the recess 16C in the screw-in body 15.
  • the distance of the base 161e of the recess 16e from the rear end surface 143a of the disc 14a is at least equal to the thickness of the shearing rim 141, but at most equal to the height of the truncated cone 147. In the embodiment shown in FIGURES 5 and 5a, it is equal to -half the sum of the thickness of the shearing rim 141 and the height of the truncated cone 147.
  • the fifth embodiment of a sabot projectile shown in FIGURES 6 and 6a differs from the embodiments shown in FIGURES 3 and 3a and 4 and 4a described above in one way; that is, the recess 1617 forms the front portion of a hole 17, 18 completely and centrally piercing the screw-in body 15, which opens out into the base opening 104 of the sabot 10.
  • the middle portion 17 of this hole is cylindrical, whilst its rear portion 18 widens out in a cone shape in the direction of the base opening 104.
  • the disc-shaped connecting piece 14a, 142C bonded to the projectile body boat-tail is the carrier of a casing 19 arranged in the middle portion 17 of the hole and reaching through to its rear portion 18, which contains, for example, a tracer composition 20.
  • the propellant gases do not only impinge on the base surface of the sabot 10, but also on the base surface of the projectile body 11.
  • projectile body 11 are such that the acceleration to which the sabot projectile shaped as in FIGURES 6 and 6a is subjected during this movement is considerably greater than that imparted to the projectile body 11 by the gas force.
  • the inertia of the projectile body 11 is therefore preponderant and, as in the previous embodiments, causes the shearing through of the connecting piece.
  • the material of that part of the screw-in body 15 of the tive embodiments of the invention described, in which the recesses 16 are lformed, has a higher strength than the material from which the connecting pieces 14 secured to the projectile body boat-tail 110 are made.
  • the shearing rim 141 is so dimensioned that it withstands this load caused by the inertial force, and thus no premature separation of the projectile body 11 from the sabot 10 can take place as a result of breakage of the connecting piece 14.
  • the projectile body 11 together with the sheared-olf component 145a, 145b, 145e, 145d or 145e, supports itself to the rear, that is, according to the design version in each case of one of the ve examples, either (FIGURE 6a) through the intersecting plane 146e of the (thereby strongly compressed) component 145e against the generated surface 162b of the recess 16h, or (FIGURE 4a) through the rear end surface 143b of the component 145C (therefore without the compression of the previous example) against the base 161b of the recess 16b then acting as an abutment, or on the other hand (FIGURES 2a, 3a) through the component 145a or 145b, against these two supporting surfaces at the same time.
  • the projectile body 11 is caused to rotate by the friction which acts between it and these supporting surfaces transmitting the spin of the screw-in body 15 or the sabot 10.
  • FIGURES 6 and 6a which is identical with the embodiment according to FIGURES 3 and 3a as regards the supporting of the projectile body 11 on the tapered recess Wall 162b after discharge
  • the rearward movement of the projectile body 11 in relation to the sabot 10 on discharge comes to rest when the sum of the axial component of the reaction force transmitted by the recess wall 162b and the gas Iforce acting on it through the casing 19 is of the same magnitude as the inertia force acting on it.
  • the conditions can be so adjusted, as with the version under consideration, that this is the case when the relative distance covered by the projectile body is equal to half the sum of the height of the tapered projectile body boat-tail 110 and the thickness of the shearing rim 141.
  • the tracer composition 20 which may, for example, be contained in the casing 19, is ignited by the hot propellant gases during the passage of the sabot projectile down the gun barrel.
  • the sheared-oif ring-shaped shearing rim 141 gripped between the shoulder 103 of the sabot 10 and the ring-shaped frame surface 151 of the screw-in body 15, is also compressed on the surface of cut 144, corresponding to the shape of the tapered boat-tail 110 of the projectile body 11 (see, for example, FIGURE 2a).
  • sheared-olf component 14511, 145b, 145e, 145d or 145e hard soldered to the projectile body boattail 110, situated in a shearing position on penetrating into the recess 16a, 16b or 16C of the screw-in body 15, is also deformed into a truncated cone by compression on the intersecting plane 14611, 146b, 146C, 146d or 146e.
  • the relative displacement path of the projectile body 11 in the sabot 10 is so dimensioned that the rear inside diameter of the surface of cut 144 of the shearing rim 141 is a little larger than the front outside diameter of the sheared-oif component 145a, 145b, 145C, 145d or 145e secured to the projectile base surface 111 of the projectile body 11.
  • the forward inertia force acting on the projectile body 11 at the end of feeding in a cartridge into a chamber URES 3, 4 and 6 causes in some cases a slight deformation of the shearing rim 141 between the place where it is gripped in the sabot 10 and the place where the soldered connection starts on the edge of the base surface 111 of the projectile body boat-tail 110, that is, a forward bending deformation of the shearing rim 141 occurs.
  • the truncated cone-shaped thickenings 142a, 142b or 142C and 147 now represent a strengthening compared to the disc 14a as in FIGURES 2 and 2a through which, after a possible tearing-off of the soldered connection, this additional deformation described, and therewith the danger of a complete separation of the projectile body 11 from the connecting piece 14, are prevented.
  • solder can accumulate between the front surface of the latter and the generated surface of the tapered projectile boat-tail that again solidiiies, namely either in isolated places, or in the most extreme cases on the whole circumference of the projectile boattail 110. These accumulations of solder can impede the shearing-off of the shearing rirn 141.
  • the connecting part can be constructed as in FIGURE 5.
  • connecting pieces constructed as in F-IG- can also be supplemented with a truncated cone 147 which, as in the version as in FIGURE 5, lies in front of the plane containing the front surface of the shearing rim 141.
  • a sabot projectile comprising a projectile body having a'base surface at one end, a disc-shaped connectlng piece se-cured to said base surface having a rim extending circumferentially beyond said base surface, a sleeve shaped sabot for receiving said projectile body formed at one end by a wall portion, a ring surface on said'wall portion defining a circular recess in said wall portion, said ring surface coaxially seating against said rim and defining a circular shearing edge around the perlphery of said recess to shear through said connecting piece when the sabot projectile is discharged by the lnertia of said projectile body causing said base surface to enter said recess.
  • a sabot projectile according to claim 4 in which the rear end surface of said truncated cone has a diameter which at most is equal to that of the base surface of said recess.
  • a sabot projectile according to claim 3 wherein said connecting piece is provided on its front side with a coaxial truncated circular cone tapering to the rear.
  • a sabot projectile according to claim S wherein the depth of said circular truncated cone is at least equal to the thickness of said disc.
  • a sabot projectile according to claim 15 wherein said wall portion has a hole, open to the rear, accommodating said casing.
  • a sabot projectile comprising a projectile body having a rear surface, a sabot in which said body rests, a connecting part forming a separable mounting of said body in said sabot, said connecting part having an edge protruding beyond said body, means for fastening said connecting part to said rear surface, said sabot having a circular surface, means for supporting said edge adjacent said circular surface, said sabot having a recess surrounded by said circular surface and said recess forming jointly with said circular surface a circular coaxial edge to form a shearing means for said connecting part.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
US566850A 1965-07-22 1966-07-21 Sabot projectile Expired - Lifetime US3349712A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1026165A CH443060A (de) 1965-07-22 1965-07-22 Treibspiegelgeschoss

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US3349712A true US3349712A (en) 1967-10-31

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US (1) US3349712A (de)
AT (1) AT267368B (de)
BE (1) BE684482A (de)
CH (1) CH443060A (de)
FR (1) FR1502721A (de)
GB (1) GB1102632A (de)
NL (1) NL6610251A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3446147A (en) * 1966-03-04 1969-05-27 Oerlikon Buehrle Holding Ag Casing for the sabot of a projectile
US3496869A (en) * 1967-07-28 1970-02-24 Oerlikon Buehrle Holding Ag Sabot projectile
US3838497A (en) * 1972-11-15 1974-10-01 Us Army Attachment of rotating band to shell casing by brazing
US4249466A (en) * 1977-07-21 1981-02-10 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Sabot projectile having a pyrotechnic composition
US4690029A (en) * 1985-12-16 1987-09-01 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Method of securing a flare composition sleeve in a blind borehole at the tail portion of a projectile body
US10502515B2 (en) * 2017-01-17 2019-12-10 Raytheon Company Launch piston brake
US11402188B1 (en) * 2020-08-28 2022-08-02 The United States Of America As Represented By The Secretary Of The Army Pyrotechnic delayed extended range shotgun munition
US11674782B1 (en) * 2020-08-28 2023-06-13 The United States Of America As Represented By The Secretary Of The Army Piston actuated extended range projectile with segmented slip band

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3106263C2 (de) * 1981-02-20 1985-06-27 Mauser-Werke Oberndorf Gmbh, 7238 Oberndorf Treibspiegelgeschoß
GB2123123A (en) * 1982-07-01 1984-01-25 Honeywell Inc Projectiles
DE3243430C2 (de) * 1982-11-24 1987-01-08 Mauser-Werke Oberndorf Gmbh, 7238 Oberndorf Geschoß mit einem rohrförmigen Körper
DE102019125841A1 (de) 2019-09-25 2021-03-25 Rheinmetall Waffe Munition Gmbh Verfahren zur Herstellung eines Treibspiegelgeschosses

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US388413A (en) * 1888-08-28 And harris p
FR496991A (fr) * 1919-01-02 1919-11-21 Humbert Bourdiol Forme rationnelle à donner aux projectiles de tous calibres et aux véhicules maritimes et aériens, pour une récupération d'énergie dépensée
US1328247A (en) * 1917-09-10 1920-01-13 Arthur F Poole Electric-clock system
US3044400A (en) * 1953-09-21 1962-07-17 Robert L Detwiler Sabot

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US388413A (en) * 1888-08-28 And harris p
US1328247A (en) * 1917-09-10 1920-01-13 Arthur F Poole Electric-clock system
FR496991A (fr) * 1919-01-02 1919-11-21 Humbert Bourdiol Forme rationnelle à donner aux projectiles de tous calibres et aux véhicules maritimes et aériens, pour une récupération d'énergie dépensée
US3044400A (en) * 1953-09-21 1962-07-17 Robert L Detwiler Sabot

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3446147A (en) * 1966-03-04 1969-05-27 Oerlikon Buehrle Holding Ag Casing for the sabot of a projectile
US3496869A (en) * 1967-07-28 1970-02-24 Oerlikon Buehrle Holding Ag Sabot projectile
US3838497A (en) * 1972-11-15 1974-10-01 Us Army Attachment of rotating band to shell casing by brazing
US4249466A (en) * 1977-07-21 1981-02-10 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Sabot projectile having a pyrotechnic composition
US4690029A (en) * 1985-12-16 1987-09-01 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Method of securing a flare composition sleeve in a blind borehole at the tail portion of a projectile body
US10502515B2 (en) * 2017-01-17 2019-12-10 Raytheon Company Launch piston brake
US11402188B1 (en) * 2020-08-28 2022-08-02 The United States Of America As Represented By The Secretary Of The Army Pyrotechnic delayed extended range shotgun munition
US11674782B1 (en) * 2020-08-28 2023-06-13 The United States Of America As Represented By The Secretary Of The Army Piston actuated extended range projectile with segmented slip band

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Publication number Publication date
BE684482A (de) 1967-01-03
CH443060A (de) 1967-08-31
GB1102632A (en) 1968-02-07
AT267368B (de) 1968-12-27
FR1502721A (fr) 1967-11-24
NL6610251A (de) 1967-01-23

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