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Патент USA US3045607

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July 24, 1962
s, s, LINN
3,045,597
CENTRIFUGAL TYPE SAFETY AND ARMING SPRING FOR FUZE APPLICATIONS
’ Filed Sept. 21, 1960
I311
15
.El.
23
INVENTOR.
5- S - Linn.
United States
‘ ate
1
3,045,597
CENTRIFUGAL TYPE SAFETY AND ANG
SPRING FOR FUZE APPLICATIONS
Sidney S. Linn, Garden City, N.Y., assignor to the United
States of America as represented by the Secretary of
. tic
3,045,597
Patented July 24, 1962
2
cumferential extent. The housing 1 is provided with in
wardly projecting pin 18 which abuts with groove end
wall 16 when the rotor is in the unarmed position and end
wall 17 when the rotor is in the fully armed position.
In order to move the rotor 13 from unarmed to armed
position there is provided a spring 19, as shown in FIG
URES 1 and 2, having one end connected to the rotor
Filed Sept. 21, 1960, Ser. No. 57,591
and the other end connected to the base portion 3 of the
3 Claims. (Cl. 102-79)
housing. The spring 19 is formed from a piece of spring
wire bent at spaced points to provide a straight central
This invention relates to a centrifugal type safety and
section 20. Applied to the central section 20 by pressing
arming spring for fuze applications and more particularly
or brazing or formed integral therewith is the weight
to means for moving an arming rotor in a fuze utilizing
member 21. When the rotor is in the unarmed position
centrifugal force applied to a spring, the centrifugal force
as shown in FIGURE 2 and the fuze is not spinning the
being generated by spin of the fuze.
This invention comprises an improvement over the 15 spring 19 is in equilibrium; i.e. in an unstressed condition.
When the fuze is spinning centrifugal force will act on
centrifugal spring arming device disclosed in copending
each segment of the spring as well as on the weight 21
application by H. G. Wenig and having a common as
and tend to move the spring radially outward. This
signee, Serial No. 53,857 ?led September 2, 1960, now
applies a torque to the rotor to move it through 90° to
Patent No. 3,013,496.
In the above identi?ed application there is disclosed a 20 the armed position with the pyrotechnic elements 5, 14
aligned. With the rotor so positioned the ?ring pin will
centrifugally ‘actuated arming means for fuzes in spin
initiate the element 14 on impact thus detonating the
stabilized projectiles in which centrifugal force acts on a
projectile.
coil or helical spring or the like to expand the Spring and
Upon ?ring the groove 15 and pin 18 serve a dual pur
rotate an arming rotor. While such a spring is satis
factory in most instances, it has been found in some ap 25 pose. When ?red the projectile and fuze have a very high
angular acceleration which would tend to distort the
plications that a proper ratio of mass to spring constant
spring 19 immediately to move the rotor to armed posi
cannot be attained to provide proper operation. The
tion. However, the pin 18 engages the end wall 16 of
spring of the present invention has added thereto or
the groove during angular acceleration and in like manner
formed therein a concentrated mass. This mass can be
varied to any degree desired so that a proper mass to 30 accelerates the rotor. When the angular acceleration de
creases or ceases the centrifugal force acting on the spring
spring constant can be obtained for all conditions of
the Army
operation.
is effective to move the rotor to armed position.
When
the rotor has been armed pin 18 abuts end wall 17 of the
groove to insure proper alignment of the pyrotechnic
ing a centrifugally operated arming spring of non-uniform
35 element.
mass per unit length.
FIGURE 3 illustrates a spring 22 of modi?ed form. In
It is a further object of this invention to provide a fuze
this embodiment the spring is of arcuate shape and carries
having a centrifugally operated arming spring with an
the weight 23 at approximately the midportion thereof.
additional mass attached thereto.
It can be seen that this modi?ed shape will provide
Another object of the invention is to provide a fuze
having a centrifugally operated spring with a concentrated 40 different characteristics for a given spin speed than that
of FIGURES 1 and 2.
mass near the center thereof.
As pointed out above application Serial No. 53,857,
These and other objects will become more apparent
now Patent No. 3,013,496 discloses a similar fuze system
when reference is had to the following detailed descrip
utilizing a coil or spiral spring or the like. For most ap
tion and drawing, in which:
plications such a spring has been found to be satisfactory.
FIGURE 1 is an elevation view partly in section of a
However, in certain instances it has been found extremely
fuze according to the present invention,
dif?cult to obtain the proper ratio of mass to spring con
FIGURE 2 is sectional view taken on the line 2—2 of
stant to provide the desired results. With the arrange
FIGURE 1 looking in the direction of the arrows and
ment of the present invention this ratio may be changed
showing one form of spring, and
FIGURE 3 is a perspective view of a modi?ed form of 50 at will by varying the size of the weight attached to the
spring and the instant device is applicable to all fuze
spring.
applications.
Now having reference to the drawing there is shown a
While I have described speci?c embodiments of my
fuze having a body 1 provided with a reduced, threaded,
invention herein, it will be recognized that various
rearward extension 2 and base portion 3. The base por
tion 3 is provided with a through passage 4 having pyro 55 changes in construction and arrangement may be made
without departing from the scope of the invention as de
technic element 5. The reduced end portion 2 of the
?ned in the appended claims.
body is adapted to be screw connected to the forward
I claim:
end of a spin stabilized projectile so as to be rotatable
1. A fuze for attachment to a spin stabilized projectile
therewith when in ?ight. The body 1 is provided with a
comprising, a body having a central bore therein, a pyro
central bore 6 in which is rigidly mounted the plate 7.
technic element disposed at the rearward end of said bore,
The ?ring pin 8 is carried by the plate 7 in alignment with
a ?ring pin at the other end of said bore and in align
pyrotechnic element 5 and is movable rearwardly on im
ment with said pyrotechnic element, a rotor mounted
pact by any conventional means such as crushing of the
for limited rotation between unarmed and armed posi
ogive 9. Rotatably mounted within aligned recesses 10
and 11 in the base portion 3 and plate 7, respectively, is 65 tions in said central bore, a pyrotechnic element in said
rotor, a wire spring disposed between the rearward end
the spindle 12 of an arming rotor 13. The rotor 13 car
ries a pyrotechnic element 14 which is normally 90° out
of said central bore and the rearward end of said rotor,
It is an objection of this invention to provide a fuze hav—
of alignment with the ?ring pin 8 as shown in solid lines
in FIGURE 2, but which during ?ight moves into align
said spring having oppositely bent ends, one end being
connected to said rotor, and a weight attached to said
ment therewith as shown in dotted lines in FIGURE 2 70 wire spring intermediate its ends, centrifugal force due to
in a manner to be described. The rotor 13 is provided
spin of said body causing said weight to move outwardly
with a peripheral groove 15 of substantially 90° cira
to distort said wire spring and apply a torque to said
3,045,597
3
4.
rotor, whereby said rotor will rotate from its unarmed
position to its armed position, whereby the pyrotechnic
element in said rotor is aligned with the pyrotechnic ele
ment and said ?ring pin.
2. A device as de?ned in claim 1 in which said wire
spring is arcuate in shape.
3. A device as de?ned in claim 1 in which said wire
spring is provided with a pair of bends intermediate the
2,663,260
2,790,390
2,824,518
2,850,980
2,856,855
2,873,677
2,873,678
Thompson ___________ __ Dec. 22, 1953
Baker ________________ __ Apr. 30, 1957
663,042
France _______________ __ Feb. 16, 1928
ends thereof, said weight being disposed intermediate said
bends.
Piskorski ____________ __ Feb. 25, 1958
Stevenson _____________ __ Sept. 9, 1958
Horowitz ____________ __ Oct. 21, 1958
Taylor _______________ __ Feb. 17, 1959
Koonz _______________ .._ Feb. 17, 1959
FOREIGN PATENTS
10
References Cited in the ?le of this patent
UNITED STATES PATENTS
792,369
Watson ______________ __ June 13, 1905
i
vi
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