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Патент USA US2406730

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Patented Aug. 27, 1946
‘ 2,406,730
Richard H. Whitehead, New Haven, Conn.
Application September 16, 1939, Serial No. 295,248
3 Claims.
(Cl. 58-417)
This inventionrelates to a vibrator element for
use in rapid timing mechanisms, particularly
where the timing mechanism is to be subjected to
The plate B is thinner than the plates A, C and
D and has a portion l3 over-hanging the edge of
the escapement wheel II ‘and this over-hanging
portion is connected across the center of the plate
strong forces of rotation as for example timing
to the other side of the plate at M to form a bridge
l5 which carries a bearing l6 for a pivot ll of a
shaft l8 which carries the vibrator l9. This vi
fuses, the vibrator element is preferably placed at
brator 19 carries a pair of downwardly extending
the exact axis of the fuse so that the force of ro
verge pins 20 and 2! which extend on opposite
tation will act symmetrically upon it. Such vi
brators have been provided comprising a single 10 sides of the bridge [5 into the path of the teeth
22 of the escapement wheel I I so that the vibra
straight strip of spring material extending on both
tion of the vibrator will move the verge pins to
sides of the center line and having the length
release the escapement wheel one tooth at a time
thereof controlled to vary the timing of the fuse.
in the usual manner. The vibrator itself is pref
Such vibrators, however, are subject to unknown
erably composed of two outwardly extending arms
and uncalculable force when the fuse is ?red
23 and 24 which are balanced against each other
with the shell by reason of the fact that the pro
and move in a cut out portion 25 in the plates C
pulsive charge introduces strong force along the
and D.
axis of the fuse and rotational accelerational
The vibrator has an upper pivot 26 which has
forces introduce complications. These forces are
very large by reason of the fact that the fuse must 20 bearing. in another superposed plate which is
omitted for the sake of clearness.
attain a. rotational speed of 12,000 to 24,000 revo
mechanisms employed for time fuses.
In a mechanism of this kind, that is in time
lutions per minute during the brief interval while
the projectile is within the bore of the gun.
It is an object of this invention to provide a
vibrator which will maintain a uniform timing
under all conditions of operation in the fuse and
notwithstanding the large force to which it is
In accordance with this invention the vibrator
I9 is controlled by a hair spring 21 of hair pin
form having its doubled end looped around a pin
28 carried by plate B having its legs extending on
opposite sides of the shaft l8 and having its free
ends attached to a block 29 slidable in a slot 30
in the plate A and having its position controlled
by a radially disposed screw 3! screw threaded
It is a further object to provide a fuse which
can be timed by the rotation of a, single element. 30 into the block 29 and having an enlargement 32
?tting within a recess 33 in the plates A and B.
The invention accordingly comprises an article
This recess is of such a character as to take the
of manufacture possessing the features, properties
end thrust of the screw and permit the hair
and the relation of elements which will be ex
spring to be brought under tension thereby.
empli?ed in the article hereinafter described and
As illustrated the block 29 has a lower portion
the scope of the application of which will be in
34 of more or less square shape, ?tting within the
dicated in the claims.
slot 30 and having an upper portion 35 provided
For a fuller understanding of the nature and
with a recess 36 adapted to receive both ends of
objects of the invention, reference should be had
the free ends of the hair spring 21 and preferably
to the following detailed description, taken in
connection with the accompanying drawing, in 40 these free ends are turned outwardly as shown at
38. A wedge member 39 may be driven between
the free ends of the spring 21 to hold the same
Fig. 1 is a plan view of an escapement embody
ing this invention.
Fig. 2 is a section on the line 2—2 of Fig. 1.
In the ?gure the characters A, B, C and D
designate four plates, these being four of the
in place and simultaneously to bear against the
bent over ends 38.
The shaft I8 is provided with projections 40
which extend outwardly on opposite sides of the
plates of which the frame of the fuse itself is
axis and which are so positioned that with the
formed, the other plates not being illustrated be
vibrator in the neutral position these projections
lie between the arms of the spring 21, one on
cause they form no part of the speci?c invention
50 each side of the center line. Any movement,
here disclosed.
however, of the vibrator will cause the projections
The lower plate A is cut out as shown at In to
40 on one side to bow one leg of the spring 21
receive an escapement wheel II which is pivoted
outwardly on one side and to bow the other
in a bridge l2 in the plate A below the cut out
side of the spring outwardly in the opposite di
portion and is pivoted in its upper end in the
plate D at apoint not illustrated.
rection against the resiliency of the spring and
against the tension imposed on the spring by
the screw 30.
This resists the movement of the
vibrator and tends to restore it to neutral posi
The period of vibration of the vibrator is of
It is also to be understood that the following
claims are intended to cover all of the generic
and speci?c features of the invention herein de
scribed, and all statements of the scope of the
invention which, as a matter of language, might
course determined by the weight of the vibrator
be said to fall therebetween.
and by the resilient pressure of the spring 21
Having described my invention, what I claim
upon the projections =40. This timing may be
as new and desire to secure by Letters Patent
altered for adjusting purposes by screwing the
screw 3| outwardly to impose more tension upon 10
1. A vibrator pivoted for vibration and having
the spring arms or inwardly partially to relieve
a flattened portion, a looped hair spring embrac
the said tension.
ing said ?attened portion in position to engage
From the foregoing it will be clear that by ,
said flattened portion resiliently to resist rotation
reason of the fact that the spring is held under
of the vibrator and means to impose tension on
tension by the screw 3|, the weight of the ma 15 said spring.
terial of the spring 21 may be materially re
2. A vibrator element for time fuses or the like
duced from that which would ordinarily be re
‘adapted to regulate the speed of movement of a
quired, thus reducing the friction of the device
and this lightening of the hair spring as well
time fuse by regulating the speed of revolution
of an' escapement wheel comprising in combi
as the construction of the device tends to make 20 nation a vibratorelement constructed and ar
ranged to operate verge pins in the path of the
escapement wheel and having projections on op
' This device is, moreover, simple to construct
posite sides of its axis, a looped‘ hair spring em
andlreliable in operation.
bracing said projections and means to impose
‘Since certain changes may be made in the 25 tension upon said hair spring,
above construction and different embodiments of
3. A device in accordance with claim 2 in which
the vibrator more nearly free from the rotational
forces above referred to.
the invention could be made Without departing
from the scope thereof, it is intended that all
the portions of the looped hair spring are parallel
to and substantially in contact with the surface
matter contained in the above description or
of said ?attened portion whereby on rotation of
shown in the accompanying drawing shall be 30 said vibrator the outer edges of said ?attened
interpreted as illustrative and not in a limiting
portion engage said hair spring.
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