CA1197724A - Cartridge case and cartridge arrangement - Google Patents
Cartridge case and cartridge arrangementInfo
- Publication number
- CA1197724A CA1197724A CA000407054A CA407054A CA1197724A CA 1197724 A CA1197724 A CA 1197724A CA 000407054 A CA000407054 A CA 000407054A CA 407054 A CA407054 A CA 407054A CA 1197724 A CA1197724 A CA 1197724A
- Authority
- CA
- Canada
- Prior art keywords
- joint
- base
- chevron
- sleeve
- cartridge case
- 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
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Abstract
ABSTRACT OF THE DISCLOSURE
A cartridge case and cartridge arrangement in which a base is joined along an annular intermating chevron-shaped joint with a sleeve. In the illustrated and preferred embodiment the base is metal and the sleeve is glass-fiber-reinforced plastic. The case has a propellant, projectile, and a per-cussive primer. A plurality of circumferentially spaced vent holes are formed in the plastic sleeve along a portion of the chevron joint as an aid to reducing excessive interface friction loads at the chevron joint during firing of the cartridge.
A less preferred modification is disclosed in which the base is formed of plastic material or a composite glass-plastic or other composite plastic material, and the sleeve is formed of metal. A further less preferred modification is disclosed in which both the sleeve and the base are formed of similar materials.
A cartridge case and cartridge arrangement in which a base is joined along an annular intermating chevron-shaped joint with a sleeve. In the illustrated and preferred embodiment the base is metal and the sleeve is glass-fiber-reinforced plastic. The case has a propellant, projectile, and a per-cussive primer. A plurality of circumferentially spaced vent holes are formed in the plastic sleeve along a portion of the chevron joint as an aid to reducing excessive interface friction loads at the chevron joint during firing of the cartridge.
A less preferred modification is disclosed in which the base is formed of plastic material or a composite glass-plastic or other composite plastic material, and the sleeve is formed of metal. A further less preferred modification is disclosed in which both the sleeve and the base are formed of similar materials.
Description
77~2~
This invention relates to a cartr.idge case having a base and a sleeve connected through an interfexence joint formed therebyO and to a cartridge arrangement incorporating such case, in which ~he preferred embodiment incorporates a metal base and a fiber-reinforced plastic sleeve.
It is desirable to provide a combined plastic and metal cartridge case and cartridge arran~ement. However, an individual base and sleeve of such materials creates substantial problems in that such joints tend to fail under firing loads.
It has particularly been found that in some important practical firing conditions where relatively large lengthwise expansion of the cartridge case can occur, such as where the propellant gas pressures cause the breech block and/or other portions of the cartridge chamber to yield and expand the firing chamber lengthwise and/or where the firing chamber has an initial large headspace enabling lengthwise expansion of the case during firing, an otherwise normally successful interference joint will fail in the plastic section due to excessive interface friction along the mating joint surfaces.
It is an object and feature of this invention to provide a metal-plastic cartridge case and cartridge incorpora-ting such, in which a chevron interEerence joint is provided at the interface between the base of metal or plastic on the one hand, and the sleeve of plastic or metal on the other hand, with plural vent holes in the radially innermost of these two parts along a portion of the chevron interface so as to reduce the interface friction in the joint during firing. Such is particularly advantageous in a metal base/plas-tic sleeve arrange~
ment with the sleeve extending w.ithin a portion of the base along the chevron interference joint zone, although a reverse configuration may be utilized to less advantage in which the sleeve overlaps the metal base alony this chevron joint zone Likewise, the improved case and cartridge arrangement may be utilized with a reversal of materials, or with similar materials.
According to the present invention, then~ -there is provided a cartridge case which comrpises a base, a sleeve connected to the base through a mechanical interlocking over-lapping joint which forms an obturating seal under radially outward pressure exerted thereon, and a plura.lity of circ~n-ferentially spaced radially extending vent holes formed inthe radially innermost of the overlapping portions of the ~oint to enable partial pressure equalization along a longi-tudinal portion only of the join-t while enabling obturating circumferential sealing of the remaining portion of the joint.
Still other objects and attendant advantages will become apparent from a reading of the following detailed description of a preferred physical embodiment constructed according to the invention, taken in conjunction with the ac~
companying drawings, in which:
~0 Figure 1 is a longitudinal section view of a pre-ferred embodiment of a cartridge case and cartridge employing a metal base and glass-fiber reinforced plastic sleeve according to the invention, showing such in a cartridge chamber prepara-tory to firing;
Figure 2 is a Era~nentary view of the cartxidge and chamber similar to Figure 1, likewise preparatory to filing;
Figure 3 is a fragmen-tary view of the cartridge and chamber, illustxating schematically the action of the various parts during firi.ng and resultant propellant gas pressuriza-tion;
Figure 4 is an enlarged fra~nentary section view o~ the chevron joint, schematically illustratiny the venting and friction relieving action of the vent holes along a portion of the joint during firing; and Figure 5 is an enlaryed fragmentary section view of the plastic sleeve porti.on of the chevron joint showing the zone of interface frictional loading and sealing during firing and the friction-relieving action effected by gases passi.ng throu~h the friction-reducing vent holes.
Referring now in detail to the Figures of the draw-ings, in the illustrative embodiment cartridge 11 has a metal-plastic cartridge case formed of a metal base 13, a suitable metal being steel, brass, nickel, etc~ and a plastic sleeve, suitable plastic materials being glass~reinforced or other fiber-reinforced nylon, polycarbonate, acetal resin or the like.
A projec-tile 21 of suitable desired configuration i5 suitably secured in the cartridge, and a conventional or other desired main propellant charge 18 is ignitable by a con-`ventional percussive or other desired primer 14 which is pro-vided for igniting the main propellant charge, the illustrative example including an intermediate black powder charge which may have a frangible cover 16a thereon.
In ~he illustrative embodiment the nose end of the projectile 21 is carried in a steel sleeve 27 within the bore 27b of which it rides during exit from the case 13, 15O Sleeve 27 has a radially extending end flange 27f which is pressed forwardly against the rear face of the weapon barrel 45 upon firing of the cartridge 11, and an annular ob-tura-ting case seal 29 i5 provided to seal the propellant gases during the firing action. The nose end of the illustrative projectile is provided with a bore-riding nylon sleeve 25 and a multiple ring seal 23 which wedges along the tapered projectile surface to effect a seal with the boxe 27b initially and subsequently with the barrel bore 45b.
The cartridge 11 is shown chambered in a firing chamber 43c formed in a firing chamber block 43, and removably secured in place by a pawl 31, with a breech block 41 through which a suitable firing pin 51 moves to percussively engage and fire the primer 14 and the propellant powder charges 16, 18.
The cartridge 11 as seated in the firing chamber 43c may or may not have an initial head space gap of significant size at the front and/or rear end of the cartridge 11 between the cartridge and either or both of the barrel rear shoulder 45s and the breech block 41, and/or the breech block structure may itself permit a significantly large head space charge to be effected, and thereby effectively elongating the firing cham-ber, during firing and under the pressures of the propellant gases acting on the opposite end sections 13 and 15, 27 of the projectile. As a result the metal base 13 and plastic sleeve 15 are moved in opposite directions by the combined amount of any initial head space and the increase in head space through elongation of -the firing chamber 43c under the pressures exerted during firing of the propellant charges ]6, 18 to propel the projectile from the cartridge case and along the barrel bore 45b.
To this end it is desirable -to provide a joint between the metal base 13 and the plastic sleeve which will not only withstand handling loads and acceleration loads during firing, but also will enable the relative longitudinal expansion move-ment between the metal base 13 and nylon sleeve 15 during firing without rupture or separat.ion, while still effecting a sea].ed joint both prior to and during firing.
As an illustration of the overall head space which may be required to be accommoda-ted, in one chamber of approxi-mately 130 25 inches length a head space change of approximately .120 inch has been encountered.
To this end, it is important to min;m; ze the incidence of failure at the metal base/plastic sleeve joint under these practical operating conditions where such may occur, and the present invention is directed to accomplish this object and purpose.
The metal base 13 is joined to the plastic sleeve lS through an annular chevron joint which provides both good handling and accelera-tion load strength while providing an effect~
ive obturating gas seal during firingO In addition the joint enables frictional relief or reduction along a substantial extent of its length during firing to thereby enable the joint to ac-commodate the relative frictional sliding movement between the base 13 and sleeve 15 for head space accommodation and thereby minimizing the otherwise substantial likelihood of separation failure at the joint.
The chevron joint is formed by two annular interfacing intermating complementary annular step-like chevron surfaces 13ac and 15ac formed respectively on the forwardly facing rim lip 13a of the metal base 13 and the rear end surface 15a of ; the plastic slee~e 15. The chevron surfaces 13ac and 15ac are also generally tapered, and the plastic chevron section 15ac is the radially inboard one of the two sections, thereby en-abling the plastic section to be obturated and into seali.ng ~3'~
relation with the stronger less yielding metal band therearound as formed by the inwardly ~acing chevron section 13ac of the metal base rim. In the assembled condition prior to firing ; the joint is mechanically stable and forms a secure mechanical interlocking connection. In addition, as above noted, the tapered inner chevron section 15ac will be obturated radially outwardly in~o continuing sealing contact with the metal base chevron section 13ac under the forces of the propellant gas pressures during firing of the cartridge 11 and propulsîon of the projectile 21.
However, due to the problem of the requirements for accommodating initial and/or increase oE head space in the firing chamber upon firing of the cartridge, the chevron joint has i.
very substantial longitudinal tensile stresses exerked thereon, which desirably are accommodated by permitting lonyitudinal slippage along the chevron joint intermating surfaces. With the chevron joint as simply above-described the interface friction along the entirety of the length of the chevron surfaces 13ac and 15ac is so great as to seriously approach or exceed the strength of plastic materials, including those reinforced with glass or other suitable fibers. This problem is min;m; zed by providing a plurality of radial vent holes 17 in the zone of the chevron surface 15ac spaced sufficiently away ~rom -the chevron zone 15ac3 as to enable it to maintain an obtura-ting seal with the corresponding chevron surface 13ac3 of the metal i base chevron section 13ac, while enabling pressure equalizing passage of the pressurized propellant gases through -the vent holes 17 to thereby relieve the friction Eorces along -the ad-joining chevron surface seckions 13acl, 13ac2 and 15acl, 15ac2 The total ~ffect is to materially reduce -the friction and ~'7~
mechanical surface area, and thereby reduce the resis-tive forces opposing a sliding expansion of the chevron joint during firing, and to thus enable a substantially greater assurance of main-taining not only an effective gas seal at the joint but also to maintain the structural integrity and reduce -the likelihood of failure of the case at this zone.
The action of the vented chevron joint 13ac, 15ac is shown schematically in enlarged form in Figure 4, the venting separation action being exaggerated for clarity of illustration.
Figure 5 illustrates the zone of resultant obturating seating 15ac3 and normal frictional and mechanical locking resistance to relative longitudinal sliding separation movement between the base 13 and the sleeve 15 during firing.
It will be noted that the vent holes are shown as being approximately midway of the two chevron sections 15acl and 15ac2. The illustration in Figure 5 shows schematically the radial deformation at 15ad of the plastic sleeve 15 which results from obturating deformation of the sleeve 15 outwardly against the metal base in the zone of sealing chevron zones 13ac3, 15ac3. Likewise, Figure 4 schematically shows the re sultant elongation movement positioning of the base 13 and sleeve 15 joint sections 13ac~ 15ac, resulting in a gap in-to which a small radial obturating convex deformation of the sleeve 15 may occur, as shown.
` It will thus be appreciated that a metal/plastic cartridge case and cartridge construction is provided which not only provides a good interface joint seal which has strength for withstanding handling and acceleration loads, but also has provision for automatically reducing the joint interlock resist-ive action during firing, and this minimizes and materially 72~
reduces the likelihood of joint failure during firing, where large head space expansion is involved.
While the invention has been specifically illustrated and described with reference to a single illustrative and p~e-ferred example, it will be apparent that various modifications and improvements may be made without departing from the scope or spirit of the invention. Such modifications, although sub-stantiall,v less desirable, include reversal of the slip-vented interface joint, reversal of the materials, and use of other materials. These mentioned alterna-tive modifications offer substantially less advantages and, to a varying extent (varying with the individual modification) less reliability than is pro-vided by the preferred embodiment~
~0
This invention relates to a cartr.idge case having a base and a sleeve connected through an interfexence joint formed therebyO and to a cartridge arrangement incorporating such case, in which ~he preferred embodiment incorporates a metal base and a fiber-reinforced plastic sleeve.
It is desirable to provide a combined plastic and metal cartridge case and cartridge arran~ement. However, an individual base and sleeve of such materials creates substantial problems in that such joints tend to fail under firing loads.
It has particularly been found that in some important practical firing conditions where relatively large lengthwise expansion of the cartridge case can occur, such as where the propellant gas pressures cause the breech block and/or other portions of the cartridge chamber to yield and expand the firing chamber lengthwise and/or where the firing chamber has an initial large headspace enabling lengthwise expansion of the case during firing, an otherwise normally successful interference joint will fail in the plastic section due to excessive interface friction along the mating joint surfaces.
It is an object and feature of this invention to provide a metal-plastic cartridge case and cartridge incorpora-ting such, in which a chevron interEerence joint is provided at the interface between the base of metal or plastic on the one hand, and the sleeve of plastic or metal on the other hand, with plural vent holes in the radially innermost of these two parts along a portion of the chevron interface so as to reduce the interface friction in the joint during firing. Such is particularly advantageous in a metal base/plas-tic sleeve arrange~
ment with the sleeve extending w.ithin a portion of the base along the chevron interference joint zone, although a reverse configuration may be utilized to less advantage in which the sleeve overlaps the metal base alony this chevron joint zone Likewise, the improved case and cartridge arrangement may be utilized with a reversal of materials, or with similar materials.
According to the present invention, then~ -there is provided a cartridge case which comrpises a base, a sleeve connected to the base through a mechanical interlocking over-lapping joint which forms an obturating seal under radially outward pressure exerted thereon, and a plura.lity of circ~n-ferentially spaced radially extending vent holes formed inthe radially innermost of the overlapping portions of the ~oint to enable partial pressure equalization along a longi-tudinal portion only of the join-t while enabling obturating circumferential sealing of the remaining portion of the joint.
Still other objects and attendant advantages will become apparent from a reading of the following detailed description of a preferred physical embodiment constructed according to the invention, taken in conjunction with the ac~
companying drawings, in which:
~0 Figure 1 is a longitudinal section view of a pre-ferred embodiment of a cartridge case and cartridge employing a metal base and glass-fiber reinforced plastic sleeve according to the invention, showing such in a cartridge chamber prepara-tory to firing;
Figure 2 is a Era~nentary view of the cartxidge and chamber similar to Figure 1, likewise preparatory to filing;
Figure 3 is a fragmen-tary view of the cartridge and chamber, illustxating schematically the action of the various parts during firi.ng and resultant propellant gas pressuriza-tion;
Figure 4 is an enlarged fra~nentary section view o~ the chevron joint, schematically illustratiny the venting and friction relieving action of the vent holes along a portion of the joint during firing; and Figure 5 is an enlaryed fragmentary section view of the plastic sleeve porti.on of the chevron joint showing the zone of interface frictional loading and sealing during firing and the friction-relieving action effected by gases passi.ng throu~h the friction-reducing vent holes.
Referring now in detail to the Figures of the draw-ings, in the illustrative embodiment cartridge 11 has a metal-plastic cartridge case formed of a metal base 13, a suitable metal being steel, brass, nickel, etc~ and a plastic sleeve, suitable plastic materials being glass~reinforced or other fiber-reinforced nylon, polycarbonate, acetal resin or the like.
A projec-tile 21 of suitable desired configuration i5 suitably secured in the cartridge, and a conventional or other desired main propellant charge 18 is ignitable by a con-`ventional percussive or other desired primer 14 which is pro-vided for igniting the main propellant charge, the illustrative example including an intermediate black powder charge which may have a frangible cover 16a thereon.
In ~he illustrative embodiment the nose end of the projectile 21 is carried in a steel sleeve 27 within the bore 27b of which it rides during exit from the case 13, 15O Sleeve 27 has a radially extending end flange 27f which is pressed forwardly against the rear face of the weapon barrel 45 upon firing of the cartridge 11, and an annular ob-tura-ting case seal 29 i5 provided to seal the propellant gases during the firing action. The nose end of the illustrative projectile is provided with a bore-riding nylon sleeve 25 and a multiple ring seal 23 which wedges along the tapered projectile surface to effect a seal with the boxe 27b initially and subsequently with the barrel bore 45b.
The cartridge 11 is shown chambered in a firing chamber 43c formed in a firing chamber block 43, and removably secured in place by a pawl 31, with a breech block 41 through which a suitable firing pin 51 moves to percussively engage and fire the primer 14 and the propellant powder charges 16, 18.
The cartridge 11 as seated in the firing chamber 43c may or may not have an initial head space gap of significant size at the front and/or rear end of the cartridge 11 between the cartridge and either or both of the barrel rear shoulder 45s and the breech block 41, and/or the breech block structure may itself permit a significantly large head space charge to be effected, and thereby effectively elongating the firing cham-ber, during firing and under the pressures of the propellant gases acting on the opposite end sections 13 and 15, 27 of the projectile. As a result the metal base 13 and plastic sleeve 15 are moved in opposite directions by the combined amount of any initial head space and the increase in head space through elongation of -the firing chamber 43c under the pressures exerted during firing of the propellant charges ]6, 18 to propel the projectile from the cartridge case and along the barrel bore 45b.
To this end it is desirable -to provide a joint between the metal base 13 and the plastic sleeve which will not only withstand handling loads and acceleration loads during firing, but also will enable the relative longitudinal expansion move-ment between the metal base 13 and nylon sleeve 15 during firing without rupture or separat.ion, while still effecting a sea].ed joint both prior to and during firing.
As an illustration of the overall head space which may be required to be accommoda-ted, in one chamber of approxi-mately 130 25 inches length a head space change of approximately .120 inch has been encountered.
To this end, it is important to min;m; ze the incidence of failure at the metal base/plastic sleeve joint under these practical operating conditions where such may occur, and the present invention is directed to accomplish this object and purpose.
The metal base 13 is joined to the plastic sleeve lS through an annular chevron joint which provides both good handling and accelera-tion load strength while providing an effect~
ive obturating gas seal during firingO In addition the joint enables frictional relief or reduction along a substantial extent of its length during firing to thereby enable the joint to ac-commodate the relative frictional sliding movement between the base 13 and sleeve 15 for head space accommodation and thereby minimizing the otherwise substantial likelihood of separation failure at the joint.
The chevron joint is formed by two annular interfacing intermating complementary annular step-like chevron surfaces 13ac and 15ac formed respectively on the forwardly facing rim lip 13a of the metal base 13 and the rear end surface 15a of ; the plastic slee~e 15. The chevron surfaces 13ac and 15ac are also generally tapered, and the plastic chevron section 15ac is the radially inboard one of the two sections, thereby en-abling the plastic section to be obturated and into seali.ng ~3'~
relation with the stronger less yielding metal band therearound as formed by the inwardly ~acing chevron section 13ac of the metal base rim. In the assembled condition prior to firing ; the joint is mechanically stable and forms a secure mechanical interlocking connection. In addition, as above noted, the tapered inner chevron section 15ac will be obturated radially outwardly in~o continuing sealing contact with the metal base chevron section 13ac under the forces of the propellant gas pressures during firing of the cartridge 11 and propulsîon of the projectile 21.
However, due to the problem of the requirements for accommodating initial and/or increase oE head space in the firing chamber upon firing of the cartridge, the chevron joint has i.
very substantial longitudinal tensile stresses exerked thereon, which desirably are accommodated by permitting lonyitudinal slippage along the chevron joint intermating surfaces. With the chevron joint as simply above-described the interface friction along the entirety of the length of the chevron surfaces 13ac and 15ac is so great as to seriously approach or exceed the strength of plastic materials, including those reinforced with glass or other suitable fibers. This problem is min;m; zed by providing a plurality of radial vent holes 17 in the zone of the chevron surface 15ac spaced sufficiently away ~rom -the chevron zone 15ac3 as to enable it to maintain an obtura-ting seal with the corresponding chevron surface 13ac3 of the metal i base chevron section 13ac, while enabling pressure equalizing passage of the pressurized propellant gases through -the vent holes 17 to thereby relieve the friction Eorces along -the ad-joining chevron surface seckions 13acl, 13ac2 and 15acl, 15ac2 The total ~ffect is to materially reduce -the friction and ~'7~
mechanical surface area, and thereby reduce the resis-tive forces opposing a sliding expansion of the chevron joint during firing, and to thus enable a substantially greater assurance of main-taining not only an effective gas seal at the joint but also to maintain the structural integrity and reduce -the likelihood of failure of the case at this zone.
The action of the vented chevron joint 13ac, 15ac is shown schematically in enlarged form in Figure 4, the venting separation action being exaggerated for clarity of illustration.
Figure 5 illustrates the zone of resultant obturating seating 15ac3 and normal frictional and mechanical locking resistance to relative longitudinal sliding separation movement between the base 13 and the sleeve 15 during firing.
It will be noted that the vent holes are shown as being approximately midway of the two chevron sections 15acl and 15ac2. The illustration in Figure 5 shows schematically the radial deformation at 15ad of the plastic sleeve 15 which results from obturating deformation of the sleeve 15 outwardly against the metal base in the zone of sealing chevron zones 13ac3, 15ac3. Likewise, Figure 4 schematically shows the re sultant elongation movement positioning of the base 13 and sleeve 15 joint sections 13ac~ 15ac, resulting in a gap in-to which a small radial obturating convex deformation of the sleeve 15 may occur, as shown.
` It will thus be appreciated that a metal/plastic cartridge case and cartridge construction is provided which not only provides a good interface joint seal which has strength for withstanding handling and acceleration loads, but also has provision for automatically reducing the joint interlock resist-ive action during firing, and this minimizes and materially 72~
reduces the likelihood of joint failure during firing, where large head space expansion is involved.
While the invention has been specifically illustrated and described with reference to a single illustrative and p~e-ferred example, it will be apparent that various modifications and improvements may be made without departing from the scope or spirit of the invention. Such modifications, although sub-stantiall,v less desirable, include reversal of the slip-vented interface joint, reversal of the materials, and use of other materials. These mentioned alterna-tive modifications offer substantially less advantages and, to a varying extent (varying with the individual modification) less reliability than is pro-vided by the preferred embodiment~
~0
Claims (33)
1. A cartridge case comprising a base, a sleeve connected to said base through a mechanical interlocking overlapping joint which forms an obturating seal under radially outward pressure exerted thereon, and a plurality of circumferentially spaced radially extending vent holes formed in the radially innermost of the overlapping portions of said joint to enable partial pressure equalization along a longitudinal portion only of said joint while enabling obturating circumferential sealing of the re-maining portion of said joint.
2. A cartridge case according to claim 1, said base being formed of metal and said sleeve being formed of a plastic material.
3. A cartridge case according to claim 1, said sleeve being formed of a fiber-reinforced cured plastic resin.
4. A cartridge case according to claim 1, said mechanical interlocking overlapping joint com-prising overlapping interfacing annular chevron surfaces formed on each of said base and said sleeve, said vent holes being formed in the zone of and ex-tending through the outwardly facing innermost one of said chevron surfaces.
9.
9.
5. A cartridge case according to claim 4, said base being formed of metal and said sleeve being formed of a plastic material.
6. A cartridge case according to claim 4, said sleeve being formed of a fiber-reinforced cured plastic resin.
7. A cartridge case according to claim 4, said base having a longitudinally extending annular rim or lip a portion of which has formed thereon one of said interfacing annular chevron surfaces forming said joint.
8. A cartridge case according to claim 7, said base rim or lip being tapered at its end zone, and said one chevron surface being formed along said tapered end zone, said interfacing sleeve chevron surface being substan-tially complementarily tapered and chevron surfaces in the zone of said overlapping joint.
9. A cartridge case according to claim 8, said sleeve being disposed radially inboard of said base in the zone of said joint and having its said chevron sur-face facing radially outwardly and having said vent holes formed therein.
10. A cartridge comprising a cartridge case according to claim 1, and further comprising a projectile carried by said case, 10.
a propellant powder charge disposed within said case, and means for igniting said propellant powder charge.
a propellant powder charge disposed within said case, and means for igniting said propellant powder charge.
11. A cartridge case comprising a base, a sleeve connected to said base through a mechanical interlocking overlapping joint which forms an obturating seal under radially outward pressure exerted thereon, and a plurality of circumferentially spaced radially extending vent holes formed in the radially innermost of the overlapping portions of said joint to enable partial pressure equalization along a longitudinal portion only of said joint while enabling obturating circumferential sealing of the re-maining portion of said joint, said mechanical interlocking overlapping joint com-prising overlapping interfacing chevron surfaces formed on each of said base and said sleeve, said sleeve being disposed radially inboard of said base in the zone of said joint and having its said chevron sur-face facing radially outwardly and having said vent holes formed therein, said vent holes being formed in the zone of and ex-tending through the outwardly facing innermost one of said chevron surfaces.
12. A cartridge case according to claim 11, said base being formed of metal and said sleeve being formed of a plastic material.
13. A cartridge case according to claim 11, said sleeve being formed of a fiber-reinforced cured plastic resin.
14. A cartridge case comprising a base, a sleeve connected to said base through a mechanical interlocking overlapping joint which forms an obturating seal under radially outward pressure exerted thereon, and a plurality of circumferentially spaced radially extending vent holes formed in the radially innermost of the overlapping portions of said joint to enable partial pressure equalization over a longitudinal portion only of said joint while enabling obturating circumferential sealing of the remain-ing portion of said joint, said mechanical interlocking overlapping joint com-prising overlapping interfacing annular chevron surfaces formed on each of said base and said sleeve, said sleeve being disposed radially inboard of said base in the zone of said joint and having its said chevron sur-face facing radially outwardly and having said vent holes formed therein.
15. A cartridge case according to claim 14, said base being formed of metal and said sleeve being formed of a plastic material.
16. A cartridge case according to claim 14, said sleeve being formed of a fiber-reinforced cured plastic resin.
17. A cartridge case according to claim 14, said base having a longitudinally extending annular rim or lip a portion of which has formed thereon one of said interfacing annular chevron surfaces forming said joint.
18. A cartridge case according to claim 17, said base rim or lip being tapered at its end zone, and said one chevron surface being formed along said tapered end zone, said interfacing sleeve chevron surface being sub-stantially complementarily tapered with interfitting chevron surfaces in the zone of said overlapping joint.
19. A cartridge comprising a cartridge case according to claim 11, and further comprising a projectile carried by said case, a propellant powder charge disposed within said case, and means for igniting said propellant powder charge.
20. A cartridge case according to claim 14, said base having a longitudinally extending annular rim or lip a portion of which has formed thereon one of said interfacing annular chevron surfaces forming said joint, said base rim or lip being tapered at its end zone, and said one chevron surface being formed along said tapered end zone, said interfacing sleeve chevron surface being substan-tially complementarily tapered with interfitting chevron sur-faces in the zone of said overlapping joint, each of said chevron surfaces being formed of discrete step surfaces alternately oppositely canted at acute angles relative to an imaginary longitudinal center line of said case.
21. A cartridge case according to claim 14, each of said chevron surfaces being formed of discrete step surfaces alternately oppositely canted at acute angles relative to an imaginary longitudinal center line of said case.
22. A cartridge case according to claim 11, each of said chevron surfaces being formed of discrete step surfaces alternately oppositely canted at acute angles relative to an impaginary longitudinal center line of said case.
23. A cartridge case according to claim 22, said base being formed of metal and said sleeve being formed of a plastic material.
24. A cartridge case according to claim 22, said sleeve being formed of a fiber-reinforced cured plastic resin.
25. A cartridge case according to claim 22, said base having a longitudinally extending annular rim or lip a portion of which has formed thereon one of said interfacing annular chevron surfaces forming said joint.
26. A cartridge comprising a cartridge case according to claim 22, and further comprising 14.
a projectile carried by said case, a propellant powder charge disposed within said case, and means for igniting said propellant powder charge.
a projectile carried by said case, a propellant powder charge disposed within said case, and means for igniting said propellant powder charge.
27. A cartridge case comprising a base, a sleeve connected to said base through a mechanical interlocking overlapping joint which forms an obturating seal under radially outward pressure exerted thereon, and a plurality of circumferentially spaced radially extending vent holes formed in the radially innermost of the overlapping portions of said joint to enable partial pressure equalization over a longitudinal portion only of said joint while enabling obturating circumferential sealing of the remaining portion of said joint, said mechanical interlocking overlapping joint com-prising overlapping interfacing annular chevron surfaces formed on each of said base and said sleeve, and said vent holes being formed in the zone of and extending through the outwardly facing innermost one of said chevron surfaces.
28. A cartridge case according to claim 27, said base being formed of metal and said sleeve being formed of a plastic material.
29. A cartridge case according to claim 27, said sleeve being formed of a fiber-reinforced cured plastic resin.
15.
15.
30. A cartridge case according to claim 27, said base having a longitudinally extending annular rim or lip a portion of which has formed thereon one of said interfacing annular chevron surfaces forming said joint.
31. A cartridge case according to claim 30, said base rim or lip being tapered at its end zone, and said one chevron surface being formed along said tapered end zone, said interfacing sleeve chevron surface being substan-tially complementarily tapered with interfitting chevron surfaces in the zone of said overlapping joint.
32. A cartridge case according to claim 27, said base having a longitudinally extending annular rim or lip a portion of which has formed thereon one of said interfacing annular chevron surfaces forming said joint, said base rim or lip being tapered at its end zone, and said one chevron surface being formed along said tapered end zone, said interfacing sleeve chevron surface being substan-tially complementarily tapered with interfitting chevron surfaces in the zone of said overlapping joint, each of said chevron surfaces being formed of discrete step surfaces alternately oppositely canted at acute angles relative to an imaginary longitudinal center line of said case.
33. A cartridge according to claim 27, each of said chevron surfaces being formed of discrete step surfaces alternately oppositely canted at acute angles relative to an imaginary longitudinal center line of said case.
16.
16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000407054A CA1197724A (en) | 1982-07-12 | 1982-07-12 | Cartridge case and cartridge arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000407054A CA1197724A (en) | 1982-07-12 | 1982-07-12 | Cartridge case and cartridge arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1197724A true CA1197724A (en) | 1985-12-10 |
Family
ID=4123195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000407054A Expired CA1197724A (en) | 1982-07-12 | 1982-07-12 | Cartridge case and cartridge arrangement |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1197724A (en) |
-
1982
- 1982-07-12 CA CA000407054A patent/CA1197724A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |