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Патент USA US2106233

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Jan. 25, 1938.
I
J, T_ BEECHLYILJ
,
2,106,233
PORTABLE DEMAGNETIZER
Filed Sept. 21, 1936
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Jan. 25, 1938.
.1. T. BEECHLYN
2,106,233
PORTABLE DEMAGNET I ZER
Filgd Sept. 21', 1936
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2,106,233
Patented Jan. 25, 1938
UNITED STATES
PATENT OFFICE '
2,106,233
PORTABLE DEMAGNETIZER
John T. Beechlyn, Worcester, Mass., assignor to
0. S. Walker 00. Inc. , Worcester, Mass, a cor
poration of Massachusetts
7
Application September 21, 1936, Serial No. 101,773
10 Claims.
The principal object of this invention is to pro
vide improved means for demagnetizing articles
of high carbon or alloy steels which, during their
process of manufacture, have been held by mag
6 netic chucking.
More speci?cally the objects of this invention
are to provide a light weight portable device of
this nature which will be powerful in action and
can be manually applied to work that is too large
10 for convenient handling in relation to stationary
means of demagnetization; to provide a cored
device of this type having a strong external mag
netic ?eld combined with means for obtaining a
rolling engagement with the surface to be treated,
15 whereby the friction, ordinarily encountered with
cored demagnetizers through magnetic attrac
tion, is largely avoided; to provide a device cap
able of good working engagement with a variety
of surface contours, including cylinders and
20 cones, whether external or internal, such as for
example larger roller bearing races; to provide
an operating range of ?eld intensity wherein the
gradient will not be abrupt, with the object of
enhancing the allowable rate of passage of the
25 work, when the device is energized by alternating
current of ordinary commercial frequency, and to
provide a device that will be well adapted for use
either as a stationary or portable demagnetizing
means.
Other objects and advantages of the invention
will appear hereinafter.
Reference is to be had to the accompanying
drawings, in which
Fig. 1 is a central sectional view of a demagne~
35 tizer constructed in accordance with this inven~
tion;
Fig. 2 is a bottom plan view of the same, partly
broken away and in section;
Fig. 3 is a longitudinal sectional view on the
40 line 3—3 of Fig. 2;
Fig. 4 is an end view of the core body;
Fig. 5 is a plan of the same;
Fig. 6 is an end view of a modi?ed construction
which comes within the scope of this invention,
45 shown partly in section, and
Fig. 7 is an end view of the same.
(Cl. 175-181)
in a relative small pole area whereby the field
outside the core is intensi?ed to an extent permit
ting a space between the pole face and the work
ing plane, the point of nearest approach being
along a line in the center of the pole. This spac
ing and a receding contour of the pole faces on
each side of the nearest approach tend to pro
duce an easy slope in the ?eld gradient, that
permits complete demagnetization to be obtained
with a relatively rapid passage of the work. A
rolling engagement is provided which will, of
course, greatly facilitate the operation.
In Figs. 1 to 5, which represent a preferred
form of the device, a laminated core body I is
shown having the general form of a large segment
of a cylinder. Two deep recesses extend longi
tudinally in the core body whereby is formed a
pole system of characteristic E type, with the
tips of the poles 2 and 3, bounded by the seg
mental arc. Disposed within the recesses and 20
surrounding the central pole is a suitable wind
ing 4 designed for operation on alternating cur
rent. The coil is secured in position by means of
clips 5 which also serve for clamping together the
laminations of the central pole by means of tie
rods 6 extending longitudinally through perfora
tions in the laminations. Clamping of the
laminations is obtained by two heading mem
hers ‘I secured by ties 8. The clamping surfaces
of the heading members are suitably recessed at 30
9 to accommodate the ends of the coil 4. The
winding 4 is fed from a source of alternating cur
rent through a ?exible cable 38.
Each of the heading members 1 carries a shaft
like cylindrical extension I B, coaxial with the seg
mental arc of the core body I. Secured to the
extreme ends of these extensions are frame mem
bers l I which are provided with lugs l2 for arbi
trarily securing the device to a bench or other
suitable foundation. Each of the frame members
also carries two lateral extensions 13 and between
the two pairs of these are secured handles H in.
a position preferably parallel with the axis of
the core body.
On the extensions Ill are rotatably mounted two
roller heads [5. These are provided with a suit
In demagnetizers of the cored type it has been
customary to employ ?at pole plates of con
able bearing lining it, preferably of the wooden
siderable area terminated abruptly in the work
two heads are ?tted to receive the ends of a
ing plane, the work being placed directly on the
plate and withdrawn by a sliding action gener~
ally with considerable manual effort. It is evident
that such a type of device is not well suited for
easy demagnetization.
In the present device the flux is concentrated
oil-less type.
At their outer circumference the
cylindrical shell H‘, which has a length somewhat 50
greater than the core body I. This cylinder to
gether with its heads completely surrounds the
magnetic element and serves at once to provide
a rolling engagement with the surface of work
passed across the device over the pole 2. Also 55
2
2,106,233
they provide an effective seal against the en
trance of ferrous matter into the coil and core
through magnetic attraction.
til
To prevent excessive eddy currents from aris
ing by the passage of the alternating ?ux through
the shell, the latter may be made from dielectric
material, but, with consideration to strength, it
has been found desirable to employ a metal hav
ing high electrical resistivity, such as can be
it) obtained with certain manganese or nickel alloys.
In the form shown in Figs. 1 to 5 the shell
is not directly secured to the roller heads but is
kept in seated engagement on these through the
action of leaf springs 18. These springs are
affixed to the frame members H and exert a
moderate axial pressure on thrust rings IS. The
latter are thus urged from opposite sides against
the bearing linings of the roller heads and there
by maintain the seated arrangement of the shell
edges of which bear lightly against the roller
throughout its length and thus produce a strip
ping action. The advantages and mode of op
eration with this form are in general similar to
the device described in connection with Figs. 1
to 5.
Having thus described my invention and the
advantages thereof I do not wish to be limited to
the details herein disclosed, otherwise than as
set forth in the claims, but what I claim 1S!
10
1. In a device for removing residual magnet
ism, a laminated core, a pole on said core, the
outer end of the pole having the contour of a
cylindrical arc with the axis of the arc substan
tially at right angles to the laminating plane, and 15
a winding on said pole for producing an alter
nating magnetic ?eld beyond the outer end of
the pole, said pole contour being adapted to be
brought into close proximity with the surface
IT. This arrangement has been found a conven
ient method of construction and assembly and it
to be demagnetized.
20
2. In a device for removing residual magnet
also provides a certain amount of resiliency in
cases where heavy work pieces are brought vio
ism, a laminated core, a pole on said core, the
lently into contact with the cylinder 11.
25
With any method for demagnetizing materials
having high magnetic retentivity the e?ectiveness
of the operation depends on an adequate degree
of initial penetration by an alternating magnetic
?eld and on the rate of subsidence of this pene
tration, i. e., with a material of given charac
teristics the decrement in induction in each of
outer end of the pole having the contour of a
cylindrical arc, and a winding on said pole for
producing an alternating magnetic ?eld beyond
the outer end of the pole, said pole contour be
ing adapted to be brought into close proximity
with the surface to be demagnetized.
3. In a device for removing residual mag
netism, a source of alternating current, means ‘
connected with said source for producing an al
successive cycles, from that of the immediately
ternating magnetic flux, a relatively rotatable
preceding cycle, must not exceed a certain critical
shell surrounding the flux producing means, said
value. From which it follows that the period of
stepping down must embrace, at least, a certain
number of cycles.
The stepping down is usually e?ected by grad
ually withdrawing the object from an intense
portion of the ?eld rather than by diminishing
the ?eld itself. With a given frequency of alter
nation an abrupt intensity gradient in the ?eld
will therefore necessitate a slower Withdrawal of
the object. Conversely, an extended and uni
form gradient, such as I employ, will permit a
relatively rapid passage of the object.
When the device is used as a portable tool it
is manipulated by the handles, ordinarily in a po
sition inverted from that shown in the drawings
and simply rolled over the surface to be treated.
The use of the demagnetizer in its portable form
permits a new procedure.
The device can be ap
plied directly to the article to be demagnetized,
before it is removed from a magnetic chuck,
thereby avoiding a second handling of the arti
cle. In the case of hardened steel it will entirely
release its adherence to the chuck and thereby
avoid the difficulty ordinarily experienced in de
taching such articles.
A modified form of the device is shown in Figs.
60 6 and 7.
In this form the E type core 20 is en
closed in a relatively stationary casting 2|, suit
ably equipped with handles and lugs for fasten
ing. The end pro?le of the central pole 22 is
that of a concave cylinder surface.
Coaxial with
shell being adapted to furnish rolling contact
with the surface from which residual magnetism ‘
is to be removed, and a means whereby a portion
of the flux will traverse the shell.
4. In a device for removing residual mag
netism, a laminated core, a winding on the core
for producing an alternating magnetic circuit
with a portion of the circuit external to the
core, a relatively rotatable shell formed in a
surface of revolution surrounding said core, and
means whereby a portion of the demagnetizlng
circuit will traverse a region outside the shell.
5. In a device for removing residual mag
netism adapted for contacting engagement with
the surface from which residual magnetism is
to be removed, a laminated core, a pole on said
core for producing a region of magnetic intensity 50
in the contacting plane and a relatively rotat
able cylinder between the pole and the plane of
contact, rotation being imparted to said cylinder
by relative motion of the demagnetizer and the
surface treated.
6. A demagnetizer comprising a magnetic core,
U1 Di
a cylindrical extension a?ixed to each end of the
core, a rotatable ?ange on each extension, at cy
lindrical shell seated at each end on one of said
?anges and surrounding the core, and resilient
means for pressing the ?anges toward the core,
whereby the shell is retained in seated engage
ment with said ?anges.
'7. A device for removing residual magnetism
this surface is a laminated cylindrical roller 25
made from magnetic material and rotatably sup
ported a slight distance from the pole by suit
able bearings 23 secured to the core. Surround
ing the pole and a portion of the roller is the en
ergizing winding 24. A portion of the roller 26
furthest from the core 20 protrudes through an
opening in the casing 2| and is tangent with the
working plane of the device. In order to prevent
entrance of foreign matter into the device the
in said core partially external to the core, a rela—
tively rotatable shell formed in a surface of revo
lution surrounding said core, and a means where
by a portion of the ?ux will traverse a region
casing is equipped with leaf springs 25, the outer
said core, the outer end of the pole having the 75
comprising a laminated core, a winding on said
core, a source of alternating current connected
with said winding to produce an alternating ?ux
outside the shell.
8. In a device for removing residual mag
netism, a laminated core, a pole integral with
3
2,106,233
contour of a cylindrical arc, a winding on the
core to produce an alternating magnetic flux in
said core and beyond the end of said pole, a rela
tively rotatable shell surrounding said core and
winding, and means whereby a portion of the
flux will traverse a region outside the shell.
9. In a device for removing residual magnetism
adapted for contacting engagement with the sur
face to be demagnetized, the combination or a
10 laminated core, a pole on said core for produc
ing a region of magnetic intensity in the con
tacting plane, the face of said pole being of cy
lindrical contour, and a relatively rotatable cyl
inder between the pole and the plane of contact,
said cylinder being substantially coaxial with
said pole contour.
10. A portable device for removing residual
magnetism adapted to contact with the surface
to be demagnetized, comprising means for pro
ducing an alternating ?ux, a frame affixed to said
?ux producing means, a roller rotatably mounted
on said frame and adapted to furnish said con
tact with said surface, and handles attached to
said frame for moving the device in rolling en
gagement with said surface.
JOHN T. BEECI-ILYN.
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