I bought this cutaway model on a collectors meeting for 90,- Euro. The man who sold it to me told me that it was a rare German 3,7 cm M-granate, with a fuze specifically belonging to this type of projectile.
I finished the cutaway model (Explosive charge and powdersticks), and patched it up some more.
The only markings left on the fuze half is: most probably an L , then a Z or a 7, 20 M 1 44
The fuze functions as follows (picture 03):
In the fuze body, a pretensioned spring is placed, pushing a collar downward. In the center of the spring, the hammer pin is placed, just ending under the nose of the projectile. The shaft of the hammer pin is placed on top of the shaft of the firing pin through the hole in the collar.
The firing pin has a flange for two reasons: the first reason is that the firing pin is blocked in the upward position by a rolled up strip of foil under the flange that prevents it from moving down. Upon firing, the strip unrolls, releasing the firing pin to move down freely into the duplex detonator upon impact. Before hitting a target, the firing pin is “floating”.
The second purpose for the flange on the firing pin is to allow the collar on the pretensioned spring to push the firing pin into the detonator for self destruct. However, for that mechanism to work, the projectile has to be fired first.
Upon firing, the centrifugal force throws the eccentric weight of the barrel safety outward (2), rotating it appr 20 degrees counterclockwise, releasing the first release hook (1) to revolve over it’s pivoting point ( I gave all pivoting points a red + in the center). As soon as it can rotate clockwise, it will unhook (3), allowing the second hook (2) to rotate counterclockwise. When the second hook falls outward, it allows the hole blocking strip (4) to rotate clockwise, being released at point 5. When the blocking strip moves outward it allows the springloaded collar in the fuze body to move down and push the firing pin into the duplex detonator.
I drew in a spring (black) as I suppose it should be, a spring pushing for unlock as soon as the centrifugal force decreases and the spring overcomes the centrifugal force upon the release hook (1).
The fuze is quite identical to the 2cm Kopfzunder Zerleger in functioning, exept is has one part more; the blocking strip (4).
Questions:
Who can help me on a drawing of cartridge and projectile, and a drawing and the name of the fuze.
What is the colour code on the projectile body?
Thanks in advance,
Regards, DJH
I finished the cutaway model (Explosive charge and powdersticks), and patched it up some more.
The only markings left on the fuze half is: most probably an L , then a Z or a 7, 20 M 1 44
The fuze functions as follows (picture 03):
In the fuze body, a pretensioned spring is placed, pushing a collar downward. In the center of the spring, the hammer pin is placed, just ending under the nose of the projectile. The shaft of the hammer pin is placed on top of the shaft of the firing pin through the hole in the collar.
The firing pin has a flange for two reasons: the first reason is that the firing pin is blocked in the upward position by a rolled up strip of foil under the flange that prevents it from moving down. Upon firing, the strip unrolls, releasing the firing pin to move down freely into the duplex detonator upon impact. Before hitting a target, the firing pin is “floating”.
The second purpose for the flange on the firing pin is to allow the collar on the pretensioned spring to push the firing pin into the detonator for self destruct. However, for that mechanism to work, the projectile has to be fired first.
Upon firing, the centrifugal force throws the eccentric weight of the barrel safety outward (2), rotating it appr 20 degrees counterclockwise, releasing the first release hook (1) to revolve over it’s pivoting point ( I gave all pivoting points a red + in the center). As soon as it can rotate clockwise, it will unhook (3), allowing the second hook (2) to rotate counterclockwise. When the second hook falls outward, it allows the hole blocking strip (4) to rotate clockwise, being released at point 5. When the blocking strip moves outward it allows the springloaded collar in the fuze body to move down and push the firing pin into the duplex detonator.
I drew in a spring (black) as I suppose it should be, a spring pushing for unlock as soon as the centrifugal force decreases and the spring overcomes the centrifugal force upon the release hook (1).
The fuze is quite identical to the 2cm Kopfzunder Zerleger in functioning, exept is has one part more; the blocking strip (4).
Questions:
Who can help me on a drawing of cartridge and projectile, and a drawing and the name of the fuze.
What is the colour code on the projectile body?
Thanks in advance,
Regards, DJH
