pzgr40
Well-Known Member
On the Wk2ammo forum I got a question about the “BLU 26/b, 42/b, 61/b, 63/b, M38/40” posting on a number of U.S. patents and if any of them was used in this type of ammo.
Between these patents there was one very interesting one about a “mechanical anti disturbance mechanism, U.S.patent 3.730.100. It took me some time to read and find out exactly how this mechanism functions, finding out it is a very clever design.
The mechanism is meant to start to function after a piece of ammo has come to rest after being thrown or fired; even the smallest movement will activate the mechanism.
I do not know if this mechanism has ever been used in a piece of ammo, either did not pass the test phase, either never passed the patent status.
The full patent can be found here: http://www.freepatentsonline.com/3730100.pdf
To make a three page story a bit more easy to understand I made a short report on it’s functioning, colouring the parts in the main drawing for ease.
The mechanism exists of a central housing (light green) in which a spring loaded firing pin (200) is placed. The firing pin wants to move downward into the firing cap (205), however it is held in position by a locking ball (purple, 111) which falls in V-shaped groove in the upper part of the firing pin. The ball is forced inward by a clockspring (light blue, 300), which is wound tightly around the central housing (light green) body. One side of the spring is hooked in a slot opposite to the ball, the other side of the clock spring is brassed to a terminal stop (yellow) which exists of a piece of shaft with a recess in the middle.
On the outer rim of the top flange of the central housing a small part has a lowered part in which a smal hemispherical groove is machined in which the smaller middle part of the terminal stop (yellow) is placed. For instance; if the middle part of the terminal stop has a 5 mm diameter , the groove is 2 mm deep , so the terminal will always fall out if it gets the chance. However, the terminal is locked up in it’s upper position by the pin (red, 408) which is connected to the wheel (red) and is placed under the (bigger dia.) end part of the terminal stop.
The wheel (red) however is fixated against rotation compared to the central housing (light green) by a spring loaded fixating pin (dark blue, 410, 411) , stuck through a hole in the wheel.
The outer rim of the wheel (red) is a closed chamber, filled with thick silicion oil and steel bals (orange, 407) over (90 degrees) of the circunference.
After throwing , launching or firing the projectile containing this mechanism, there will be a moment the projectiel comes to a complete rest after landing. The balls (orange, 407) now slowly start to creep down to the lowest point in the ring (gravity) through the viscuous silicon oil. At a certain moment all balls have moved downward; this part of the ring is much heavier than the other (270 degrees) of the ring. Again a situation of “all parts in rest” occurs. At this moment, the fixating pin (dark blue, 410, 411) is pulled out of the wheel (most probably by means of a timer clock) and the wheel (red) is free to rotate; the mechanism is now armed.
As the balls can move only very slowly though the oil, -this may take some time-, practically the balls are now fixated.
When the projectile or object containing this mechanism is moved either rotated, the wheel (red) will seek the lowest point for the heaviest part of the wheel rim (where the balls are), rotating the wheel compared to the central housing (light green). The pin (red, 408) will now rotate away from under the end of the terminal stop, enabeling the middle part of the terminal stop to “fall” out of the hemispherical shaped recess in the outer rim of the central housing. The spring will now unwind (anti clockwise), thereby becoming larger in diameter, enabeling the locking ball (purple, 111) to move outward and release the firing pin (200) into the firing cap (205). As the pin (red, 408) is only small in diameter, the rotation of only one to two degrees clock- or anti clockwise will be sufficient to release the clockspring (light blue).
Because the balls (Orange, 407) are heavy and have a longer arm from the centerline (113) than the clamping force of the terminal stop (yellow) on the pin (red, 408) which has a shorter arm to the centerline of the mechanism, the larger momentum force generated by the balls on movement will enshure that the wheel wil rotate with even the smallest movement, forming a very sensitive mechanical anti disturbance mechanism
Regards , DJH
Between these patents there was one very interesting one about a “mechanical anti disturbance mechanism, U.S.patent 3.730.100. It took me some time to read and find out exactly how this mechanism functions, finding out it is a very clever design.
The mechanism is meant to start to function after a piece of ammo has come to rest after being thrown or fired; even the smallest movement will activate the mechanism.
I do not know if this mechanism has ever been used in a piece of ammo, either did not pass the test phase, either never passed the patent status.
The full patent can be found here: http://www.freepatentsonline.com/3730100.pdf
To make a three page story a bit more easy to understand I made a short report on it’s functioning, colouring the parts in the main drawing for ease.
The mechanism exists of a central housing (light green) in which a spring loaded firing pin (200) is placed. The firing pin wants to move downward into the firing cap (205), however it is held in position by a locking ball (purple, 111) which falls in V-shaped groove in the upper part of the firing pin. The ball is forced inward by a clockspring (light blue, 300), which is wound tightly around the central housing (light green) body. One side of the spring is hooked in a slot opposite to the ball, the other side of the clock spring is brassed to a terminal stop (yellow) which exists of a piece of shaft with a recess in the middle.
On the outer rim of the top flange of the central housing a small part has a lowered part in which a smal hemispherical groove is machined in which the smaller middle part of the terminal stop (yellow) is placed. For instance; if the middle part of the terminal stop has a 5 mm diameter , the groove is 2 mm deep , so the terminal will always fall out if it gets the chance. However, the terminal is locked up in it’s upper position by the pin (red, 408) which is connected to the wheel (red) and is placed under the (bigger dia.) end part of the terminal stop.
The wheel (red) however is fixated against rotation compared to the central housing (light green) by a spring loaded fixating pin (dark blue, 410, 411) , stuck through a hole in the wheel.
The outer rim of the wheel (red) is a closed chamber, filled with thick silicion oil and steel bals (orange, 407) over (90 degrees) of the circunference.
After throwing , launching or firing the projectile containing this mechanism, there will be a moment the projectiel comes to a complete rest after landing. The balls (orange, 407) now slowly start to creep down to the lowest point in the ring (gravity) through the viscuous silicon oil. At a certain moment all balls have moved downward; this part of the ring is much heavier than the other (270 degrees) of the ring. Again a situation of “all parts in rest” occurs. At this moment, the fixating pin (dark blue, 410, 411) is pulled out of the wheel (most probably by means of a timer clock) and the wheel (red) is free to rotate; the mechanism is now armed.
As the balls can move only very slowly though the oil, -this may take some time-, practically the balls are now fixated.
When the projectile or object containing this mechanism is moved either rotated, the wheel (red) will seek the lowest point for the heaviest part of the wheel rim (where the balls are), rotating the wheel compared to the central housing (light green). The pin (red, 408) will now rotate away from under the end of the terminal stop, enabeling the middle part of the terminal stop to “fall” out of the hemispherical shaped recess in the outer rim of the central housing. The spring will now unwind (anti clockwise), thereby becoming larger in diameter, enabeling the locking ball (purple, 111) to move outward and release the firing pin (200) into the firing cap (205). As the pin (red, 408) is only small in diameter, the rotation of only one to two degrees clock- or anti clockwise will be sufficient to release the clockspring (light blue).
Because the balls (Orange, 407) are heavy and have a longer arm from the centerline (113) than the clamping force of the terminal stop (yellow) on the pin (red, 408) which has a shorter arm to the centerline of the mechanism, the larger momentum force generated by the balls on movement will enshure that the wheel wil rotate with even the smallest movement, forming a very sensitive mechanical anti disturbance mechanism
Regards , DJH
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