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Патент USA US2411447

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Nov. 19, 1946.
J, w, MCCLAIN
2,411,447
SHOCKPROOF SWITCH
Filed Sept. 2, 1944
Irwventor:
Joseph W. McClain,
.
y
/
His Attorney.
Patented Nov. 19, 1946
2,411,447
UNITED STATES PATENT OFFICE
ZAllfid'l
SHDFJKPRQQF SVIIT CH
Joseph W. McClain, Schenectady, N. Y., assignor
to General Electric Company, a corporation of
New York
Application September 2, 1944, Serial No. 552,406
2 Claims.
I
2
My invention relates to shockproof switches,
more particularly to shockproof electromagnet
ically
simple,operated
reliable switches,
and inexpensive
and hasswitch
for its inobject
which
magnetic portion 4 is pulled into the coil and the
disc thereby rotated substantially 90 degrees in
portion made of magnetic material, the remainder
of the strip and the disc being made of non-mag
clockwise to its attracted position, the pivot l2,
a clockwise direction, as seen in the drawing.
Preferably, as shown, the movable part of the
the moving parts are statically balanced so as to ,, switch 6 is mounted on one end of a bell crank Ill,
the opposite end of which is connected by means
be free from the effects of shocks.
of a link H to a pivot l2 secured to the ‘disc I a
In carrying out my invention in one form, I pro
vide a disc shaped member mounted for rotation
suitable distance from the pivot 5. As shown,
the pivot I2 is in such a position that it lies on a
on a central axis about which the disc is statically
balanced. One half of the disc is in the form of lo radius extending substantially at right angles with
a peripheral strip or bar which has at one end a
the link ll. Therefore, when the disc is rotated
in moving through a 90-degree angle, moves
downward below the pivot shaft 5 into a dead cen
netic material. I further provide an operating
coil surrounding the strip which, when energized, 15 ter position, i. e. parallel with a radius of the disc,
with respect to any force applied by the link i l to
pulls the magnetic strip portion into an attracted
position whereby the disc is rotated and switch
the disc and switch. This rotation of the disc,
it will be observed, moves the switch to its closed
means connected to the disc is moved between its
operating positions.
circuit position. Thus the disc itself is not only
‘ statically balanced about its pivot shaft 5, and
For a more complete understanding of my in~
therefore free from the e?ects of shocks, but the
vention, reference should be had to the accom
panying drawing, the single ?gure of which is a
disc is not affected in terms of rotation by any
diagrammatic representation of an electric switch
shock or other force applied to the disc by the
embodying my invention.
1
switch. This is because any such force is applied
Referring to the drawing, in one form or" my ~ directly to the shaft 5 without any component
invention I provide a circular or disc-like mem
producing rotation of the disc in either direction.
her I which may be formed or cut from a plate
If desired, suitable stop means may be provided
of non-magnetic material, such as brass or a
for limiting the rotation of the disc in each direc
phenolic compound. One half of the disc l is
tion, especially stop means for positioning the vdisc
formed or cut away to leave a large aperture 2 30 angularly in its attracted position so that the link
and a semicircular peripheral strip or bar 3. The
ll extends along a radius of the disc. As shown,
strip 3, furthermore, is provided at one end with
‘the inner side I3 serves as a stop by engagement
a portion 4 made of magnetic material which ex
with the upper end of the coil to limit the coun
tends throughout substantially one half the
terclockwise rotation of the disc by the biasing
length of the strip.
35 spring 9, while the similar inner side M of the
The disc I is mounted for rotation on a pivot
disc engages the lower end of the coil to limit the
shaft 5 at its center, about which pivot shaft 5 the
clockwise rotation of the disc by the coil.
disc is statically balanced. This static balance,
While I have shown a particular embodiment
for example, may be obtained by adding suitable
‘of my invention, it will be understood, of course,
material if required to the strip 3 to offset the 40 that I do not wish to be limited thereto since many
greater weight of the opposite solid half of the
modi?cations may be made, and I therefore con
disc.
template by the appended claims to cover any such
To e?ect the rotation of the disc through a sub
modi?cations as fall within the true spirit and
stantially QO-degree angle thereby to operate an
scope of my invention.
electric switch 6, I provide a stationary operating 45
1. A shockproof switch comprising a disc mem
coil 1 which surrounds the strip 3. Preferably,
ber made of non-magnetic material provided
the coil is provided with a central bore 8 which is
with a substantially semi-circular strip de?ning
large enough to accommodate substantially one
one half of the disc member, a portion of said
half of the length of the strip 3, the coil having
strip being made of magnetic material, a central
a length sufficient to extend over substantially 50 pivot for said disc member about which said disc
one half of the length of the strip 3. By means
member is statically balanced, a coil surround
of suitable biasing means, such as a spring 9, the
ing said strip, means biasing said disc member to
disc I is biased to an angular position in which
a position in which the non-magnetic portion of
the non-magnetic portion of the strip 3 extends
said strip extends through said coil whereby
through the coil. When the coil is energized, the 55 when said coil is energized said disc member is
2,411,447
rotated substantially 90 degrees thereby to bring
said magnetic portion of said strip into an at
tracted position with respect to said coil, circuit
control means, a link connecting said circuit con
trol means with said disc member, said link being
connected to a pivot on said disc member in such
position that when said disc member is in said
attracted position said link lies along a radius of
said disc member whereby a force applied by said
link to said disc member is ine?ective to produce
rotation of said disc member.
2. A shockproof switch comprising a disc mem
ber made of non-magnetic material having a
substantially solid semi-circular portion and a
peripheral strip de?ning the opposite half of
the disc, substantially one half of said strip being
made of magnetic material, a central pivot for
said disc about which said disc is statically bal
4
anced, a coil surrounding said strip and coex
tensive with substantially one half of the length
of said strip, means biasing said disc to a posi
tion ‘in which said non-magnetic half of said
strip extends through said ‘coil whereby when
said coil is energized said disc is rotated substan
tially 90 degrees thereby to bring said magnetic
portion of said strip into an attracted position
inside of said coil, circuit control means, a link
connecting said circuit control means with said
disc, said link being connected to a pivot on said
disc in such position that when said disc is in
said attracted position said link lies along a
radius of said disc whereby a force applied by
said link to said disc member is ineffective to
produce rotation of said disc member.
JOSEPH W. MCCLAIN.
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