The invention relates to a support member according to the preamble of claim 1, and particularly to a support member for supporting a mortar shell into a breech-loading weapon barrel, the support member comprising a support element with an edge flange and a firing mechanism for firing the actual primer of the mortar shell and further comprising connecting means for attaching the support element to a tail of the mortar shell. The invention further relates to a method according to the preamble of claim 10 for attaching a support member to a mortar shell, the method comprising arranging in the tail of the mortar shell a support member which comprises a support element; and attaching the support member to the tail of the mortar shell.
A mortar can be arranged on a movable base, such as an armored vehicle, allowing the mortar to be moved conveniently from one place to another and, on the other hand, allowing it to be rapidly moved from the emplacement into safety. When the intention is to use a mortar for firing vertically or downward, the problem is that the mortar shell does not stay in place in the smoothbore barrel of the mortar, but may slide forward in the barrel, so that it can no longer be fired. U.S. Pat. No. 5,503,080 discloses a support member attachable by means of friction to guiding wings in the mortar shell tail. The solution taught by the publication has the problem of requiring extremely accurate dimensions of both the tail of the projectile and the support member itself in order for it to function in at least satisfactorily reliable manner.
An object of the invention is thus to provide a support member, and a method for attaching a support member to a mortar shell. The object of the invention is achieved with a support member according to the characterizing part of claim 1, characterized in that the connecting means for attaching the support element to the tail of the mortar shell comprise at least one flexible part arranged to be attached to the tail of the mortar shell by means of spring force. The object of the invention is further achieved with a method according to claim 10, characterized by attaching the support member to the mortar shell tail and/or to one or more guiding fins forming a part of the mortar shell tail and/or to a counterpart provided in the mortar shell tail by means of one or more flexible part in such a way that when receiving the mortar shell tail, the flexible part directs spring force at the outer periphery of the mortar shell tail and/or at one or more guiding fins forming a part of the mortar shell tail and/or at the counterpart provided at the mortar shell tail.
Preferred embodiments of the invention are disclosed in the dependent claims.
The invention is based on a mortar shell being attached to a support member with connecting means which direct spring force at the mortar shell tail. In other words, the connecting means comprise a flexible part by means of which the mortar shell tail is attached to the support member. The flexible part may, in accordance with the invention, receive the mortar shell tail in such a way that it directs spring force at the outer periphery of the mortar shell tail or at one or more guiding fins forming a part of the mortar shell tail or, at both the outer periphery of the mortar shell tail and one or more guiding fins. Alternatively, the mortar shell tail may be provided with a counterpart to which the flexible part is attached by means of spring force.
In the invention, attachment of the support member to the mortar shell tail is based on spring force, whereby the attachment is more reliable than breech based on friction. Further, possible dimensional variance caused by the manufacture of the mortar shell does not affect the magnitude of the attachment forces and the staying in place of the support member as critically as in a friction breech solution. In the solution according to the invention, it is relatively easy to control the attachment forces. Further, it is an advantage of the invention that the support member can be attached to the mortar shell tail easily and quickly even in difficult conditions.
In accordance with an embodiment of the invention, the support member is provided with a spring ring arranged to receive the mortar shell tail. When receiving the mortar shell tail, the spring ring yields, simultaneously directing spring force at the mortar shell tail. The spring ring may be provided in such a way that spring force is directed at the outer periphery of the mortar shell tail. Alternatively, the spring ring may comprise one or more slots for receiving a guiding fin forming a part of the mortar shell tail in such a way that the guiding fin to be received into the slot makes the spring ring yield, whereby the slot directs spring force at the guiding fin to attach the mortar shell to the support member.
In another embodiment of the present invention, the support member is provided with a laminated ring which is arranged to receive the mortar shell tail. The laminated ring has been provided in such a way that it directs spring force at the outer periphery of the mortar shell tail. In other words, the mortar shell tail is arranged to be received into a space generated by the laminated ring such that the laminated ring yields at least partly when the mortar shell tail is received, and directs spring force at the mortar shell tail. Alternatively, the laminated ring is arranged to receive one or more guiding fins forming a part of the mortar shell tail such that the laminated ring yields at least partly when receiving one or more guiding fins, and directs spring force at the guiding fin received.
In yet another embodiment of the invention, the support member is provided with a flexible connecting part which is arranged to receive a counterpart provided in the mortar shell tail. The flexible connecting part may be, for example, a flexible sleeve-like connecting part arranged to yield in the direction transverse to its axis when receiving the counterpart, and to direct spring force at the counterpart to attach the mortar shell to the support member.
The invention will now be described in greater detail in connection with preferred embodiments, with reference to the attached drawings, of which:
The mortar shell 1 is arranged into the barrel 2 of a breech-loading weapon. The weapon may be a mortar in which the inner surface of the barrel 2 is substantially smooth. The rear part of the mortar shell 1 comprises a tail tube 3 and a tail 4. The tail 4 comprises one or typically more guiding fins 5 for affecting the trajectory of the mortar shell 1. The details of the construction of the mortar shell 1 may deviate from the structure shown in the figure. For the sake of clarity, the breech of the weapon and other details are not shown.
A support member 6 according to the invention is attached to the tail 4 for keeping the mortar shell 1 in place in the barrel 2 until it is fired. An outer casing 12 in a support element 8 forming a part of the support member 6 is dimensioned such that at least part of the tail 4 of the mortar shell 1 can become placed inside it. An edge flange 7 in the support member 6 prevents the mortar shell 1 from moving forward in the barrel 2 when the barrel 2 is directed horizontally, or even if the barrel 2 pointed downward. The support member 6 is dimensioned to tolerate not only the load caused by the mass of the mortar shell 1 but also any forces caused by vibration and acceleration. The support element 8 further comprises connecting means 10 by means of which the mortar shell 1 is attached to the support member 6.
The connecting means 10 may be attached to the support element 8 for instance with a threaded joint or another mechanical joint which is preferably openable and closable optionally. Alternatively, the connecting means 10 may be attached to the support element 8 in a fixed manner.
The spring ring 13 may comprise slots arranged to receive guiding fins 5 forming a part of the tail 4 of the mortar shell 1. The slots allow the end of the tail tube 3 to be placed against the bottom of the support element 8. The spring ring 13 may be further shaped in such a way that the mortar shell 1 can be easily pressed into an opening delimited by the spring ring 13 but that pulling it out requires considerably more force in order for the joint not to open before firing. In accordance with
In an alternative embodiment of the spring ring 13, shown in
In yet another embodiment, the spring ring 13 may be provided such that the preceding embodiments are combined, in which case placing the tail tube 3 in the opening of the spring ring 13 generates spring force directed at the outer surface 14 of the tail 4 and, at the same time, placing the guiding fins 5 in the slots 16 generates spring force directed at the guiding fins 5. Referring to the above, it is to be noted that the spring ring 13 may be any type of ring capable of generating spring force directed at the tail 4 of the mortar shell 1 when receiving at least part of the tail 4 of the mortar shell 1.
As mentioned above, the connecting means 10 preferably comprise one or more laminated rings 20, depending on the magnitude of the desired spring force or on the force required for attaching the mortar shell. The inner periphery of the laminated ring 20 is, in accordance with
In the embodiment of
The counterpart 32 may be provided at the end of the tail tube 3 of the tail 4 of the mortar shell, in which case it is an extension of the tail tube 3 or a part of the tail tube 3. In an alternative embodiment, the counterpart 32 may simply be merely an end of the tail tube 3, left hollow, whereby it forms the counterpart 32.
The spring force directed at the counterpart 32 by the connecting part 30 can be further increased by means of one or more spring elements (not shown) installed in the connecting part. The spring elements may be individual springs placed on the outer surface of the connecting part 30, or alternatively a spring may be placed around the outer periphery of the connecting part 30. Alternatively, the counterpart 32 may be shaped and provided in such a way that it becomes placed around the connecting part 30, whereby the spring force of the flexible connecting part 30 is directed at the inner surface of the counterpart 32. The counterpart 32 may be the head part 25 of the tail 4 of the mortar shell 1.
With reference to the above, it is to be noted that both the spring ring receiving the mortar shell tail or a part of to the inside of it and the flexible connecting part receiving around it the counterpart provided at the tail may be shaped and modified in a plurality of ways. In other words, it is essential to the present invention that the mortar shell is attachable to the support member by means of spring force. The spring force is generated by a flexible part provided in the support element and arranged to yield when the mortar shell is attached to the support member. Further, it is to be noted that in some cases the mortar shell can be attached to the support member 8 by means of two or more embodiments described above.
It will be obvious to a person skilled in the art that as the technology advances, the basic idea of the invention can be implemented in a plurality of ways. Thus, the invention and its embodiments are not restricted to the above examples but may vary within the scope of the claims.
Number | Date | Country | Kind |
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20085081 | Jan 2008 | FI | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/FI2009/050075 | 1/30/2009 | WO | 00 | 7/20/2010 |