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Патент USA US2405653

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Aug. 13, 1946.
Filed May 27, 1941
Patented Aug. 13, 1946
Guido Hiinger, Geneva, Switzerland
Application May 2'1, 1941, Serial No. 395,466
In Switzerland July 9, 1940
2 Claims.
Various designs of fuses for projectiles have
been evolved in recent years in connection with
antiaircraft defense, in which a mechanism is
(Cl. 102—71)
after a certain time explode automatically as will
be shown.
The angular velocity gradually decreasing while
the projectile follows its trajectory, the centrif
released when the angular velocity of the projec
tile falls below a critical and assigned value, thus in ugal forces acting upon the weights [5 are no
longer sufficient to balance the spring Hi; the tube
allowing the striker to set off the detonator and
I3 gradually glides backward, the nose of the
produce automatic destruction of the shell.
weights l5 reaches the end ll of the slanted sur
The known fuses have the serious defect that;
faces I6, the coil spring l4 acts unhampered on
the critical angular velocity being but little infe
the tube [3 which throws the striker l0 against
rior to the initial velocity it is quite possible that
the detonator it! thus producing the automatic
this critical value may never be reached, for in
destruction of the shell.
stance in case of slightly defective propelling
On the contrary, if during propulsion the criti
charges. The result is a premature explosion of
cal value of the angular velocity is not reached,
the shell at the instant the linear acceleration
15 owing to a faulty loading of propellant for in
vanishes, that is a foot or so from the gun.
stance, the centrifugal forces exerted by the
The present invention has for its object to
weights I 5 will not suffice to pull the tube 13 for
overcome this inconvenience. A premature ex
ward. The centrifugal weights ll remain locked
plosion which might otherwise result from an
thereby keeping the striker l0 locked as well. Un
insufficient propellent loading is prevented by a
special mechanism. The transport safety device 20 der these conditions the shell may hit an obstacle,
the ground in particular, without exploding.
can free the other mechanism when and only
when the velocity of rotation of the projectile
I claim:
1. A sensitive percussion fuse for projectiles
exceeds the just described critical velocity by a
comprising a ‘fuse body, a detonator therein, a
de?nite amount which may be chosen at will.
This invention does not impair the desirable 25 striker having percussion means associated there
qualities of the shells known up to date such as
with, a tubular member coaxial with and sur
safety in transport, high sensitivity of percussion,
rounding the striker said member being axially
ease of manufacture of large quantities, as well
slidable in the fuse body, an internal shoulder
on said tubular member, a spring within said
as low cost.
The ?gure illustrates an application of the 30 tubular member and abutting between said shoul
der and the fuse body, centrifugally operated
invention to such a fuse. During transport the
transport safety means normally held by the in
striker if] is secured. in the known manner by
ner end of said tubular member in position sep
centrifugal weights I I, kept in place by the light
arating said striker from said detonator, means
pressure of a leaf spring l2; under the pressure
of a coil spring [4, a tube l3 locks the centrifugal to U! on said tubular member for driving the striker
towards said detonator under the action of said
weights ll; two cylindrical weights l5 with
spring and having a one-way connection with
rounded nose are free to move in appropriate
the striker enabling the striker to move towards
radial holes bored in a head l3a of the tube l3.
the detonator without restraint from said tubu
At the instant propulsion takes place, owing to
inertia, the pressure of the lower end l3b of the 40 lar member, a head on said tubular member, cen
trifugal weights of cylindrical form having
tube l3 on the centrifugal weights H is increased
rounded ends slidable radially in said head, and
so that in spite of the centrifugal forces developed
an internal conical ramp on the fuse body coop
the safeties remain unaltered.
erating with the rounded ends of said weights
Not until the linear acceleration nearly stops
to produce axial movement of said tubular mem
can the centrifugal weights 1 5 begin to act. They
ber, the centrifugal action of said weights being
press against the slanting surfaces I6 of a sleeve
predetermined to overcome said spring only above
lBa forming a guide for the tube parts I3, l3a
a critical angular velocity of the fuse.
and gradually pull the tube I3 forward compress
2. A sensitive percussion fuse for projectiles
ing the coil spring 14, thereby releasing the cen
trifugal weights I l which move radially owing to 50 comprising a fuse body having a cylindrical axial
bore therein of uniform diameter, a detona
the rotation of the projectile and free the striker
tor in said body, a guide sleeve lodged in said
It. The shell is then armed and it will explode
bore and having an internal ramp at its outer
the instant it hits any part of the aircraft.
end, a member with a head having radial cavities
Should the projectile not encounter any ob
stacle, it would follow its course undisturbed and 55 therein and a tubular stem both said head and
said stem being guided by said sleeve for sliding
ing a one-way connection with the striker en
axial movement of said member, an internal
shoulder in said tubular stem, a spring within
enabling the striker to move towards the detona
said member said spring abutting at one end
against said shoulder and at the other end against
the fuse body, transport safety means within said
centrifugal weights of cylindrical form having
axial bore said means including centrifugal masses
normally held by the inner end of said tubular
stem in position separating said striker from
said detonator, means on said tubular stem en
gaging said striker to force it towards said det
onator under the action of said spring and hav
tor without restraint from said tubular member,
rounded ends slidable in said radial cavities with
the rounded ends engaging said internal ramp
to produce axial movement of said member, the
centrifugal action of said weights being prede
termined to overcome said spring only above a
10 critical angular velocity of the fuse.
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