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Патент USA US3068423

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Dec. 11, 1962
A. T. SONATORE
3,058,413
PIVQT BASE SECURING METHOD AND MEANS
Filed May 9, 1960
ANTHONY Z SONA TORE
IN VEN TOR.
United States Patent O?fice
1
3,558,413
Patented Dec. 11, 1962
2
An object of this invention is the provision of a method
3,068,413
PI‘VQT BASE SECURING METHGD AND MEANS
Anthony T. Senators, Holmdel, NJ, assignor, by mesne
assignments, to Daystrorn, Incorporated, Murray Hill,
NJ” a corporation of Texas
Filed May 53, 19%, der. No. 27,574
3 Ciairns. (Cl. 324-155)
of electrically connecting ‘a coil wire end, by soldering,
to a pivot base at a point intermediate the pivot base and
coil.
An object of this invention is the provision of a moving
coil assembly comprising a pivot base secured to a mov
ing coil, and means soldering the coil end to the bottom
surface of the pivot base intermediate the said base and
coil.
This invention relates to ‘an electrical instrument and
These and other objects and advantages will become
more particularly to ‘a method and means for securing 10
apparent from the following description when taken with
the ends of a movable coil winding to the pivot bases
attached to the coil.
the ‘accompanying drawings. It will be understood that
the drawings are for purposes of illustration and are not
Electrical instruments such as ammeters, voltmeters,
to be construed as de?ning the scope or limits of the in
and the like, include a wire-wound movable coil which
coil may be wound upon 1a generally rectangular-shaped 15 vention, reference being had for the latter purpose to the
appended claims.
coil frame. Two pivot assemblies, each including a base
In the drawings wherein like reference characters de
and a pivot pin mounted on the base, are secured to the
note like parts in the several views:
outer sides of the opposite ends of the coil, with the pivot
FIGURE 1 is a side elevational view of a coil assembly
pins projecting outwardly ‘along an axis extending through
the center of the coil. The pivots are carried in suitable 20 embodying my invention, parts being shown broken away
bearings for pivotable support of the coil.
In a typical moving-coil mechanism, a pair of spiral
springs are employed to provide a calibrated force 0p—
posing the moving coil torque; one spring surrounding
each pivot base and connected thereto through suitable
spring abutment members secured to the said pivot bases.
The outer ends of the spiral springs ‘are secured to outer
abutments and, in accordance with established practice,
the springs not only bias the moving coil to a predeter
mined zero position, but also are employed to conduct
current to the coil; the ends of the coil windings being
electrically connected to the pivot base to provide an
electrical connection from the coil through the said spiral
springs to the outer spring abutments. My invention in
cludes a novel method and means of securing the ends
of the movable coil windings to the pivot bases. In ac
cordance with my invention, the end of the coil winding
is secured to the pivot base simultaneously with the attach
ment of the pivot base to the coil. Further, in accord
ance with my invention, the end of the coil winding, or ‘
for clarity;
FIGURE 2 is an exploded fragmentary sectional view
showing the connection between one end of a coil wire
and a pivot base; and
FIGURE 3 is a fragmentary, semi-diagramm-atical view
of a positioning ?xture with a coil assembly mounted
thereon, which ?xture may be used in the method and
means of soldering the end of the coil winding to the pivot
base in accordance with my invention.
Reference is now made to FIGURE 1 of the drawings
wherein there is shown a coil assembly comprising a
generally rectangular-shaped coil frame lil with a wire
wound movable coil 11 wound thereon. A pivot assembly
comprising a pivot base 12 and ‘a pointed pivot 13 is
mounted at each end of the coil, which pivots are shown
rotatably supported in jewel bearings 14.
The pivot base may comprise a ?at base portion 16, an
upstanding rectangular boss 17 and an externally-threaded
cylindrical portion 18, the latter having an axial bore, not
shown in FIGURE 1 for accommodation of the pointed
pivot 13. A piece of insulating material 19, of cloth or
paper, or the like, is positioned between the coil 11 and
coil lead, is secured to the bottom surface of the pivot
base intermediate the pivot base and coil end turns. In
base portion 16 of the pivot base to serve as insulation
a co-pending patent application Serial Number 23,228,
therebetween. Suitable cement secures the pivot base
now abandoned, of Raymond G. Drewes and Wallace W.
Macintosh, ?led April 19, 1960, and assigned to the same 45 and insulating member to the coil winding, ‘as described
in detail hereinbelow.
assignee as the present application, a method and means
A conventional pointer 21 with a hub portion having
for securing a pivot base to an instrument coil are shown,
a hole therein is mounted on the pivot base, the cylin
which may be employed in the practice of this inven
drical portion 1% of the base extending through the hole
tion. The disclosure of such co-pending application is
with the pointer hub resting on the boss 17. A washer
incorporated herein“ by reference thereto. Disclosed
22 is located between the pointer 21 and an inner spring
therein is a resistance heating method wherein an elec~
abutment 23. At the lower end of the coil assembly the
trical current is passed through the pivot base to heat
spring abutment 23 abuts the boss 17; no pointer being
the pivot base and adjacent cement used in securing the
included at that end. Nuts 24 threaded on the externally
base to the coil thereby at least partially curing or polym~
erizing the cement. With my invention, the bottom sur 55 threaded portion 18 of the bases secure the pointer and
inner abutment thereto.
faces of the pivot bases and the ends of the coil winding
The inner ends of spiral springs 26 are secured to the
are pre~tinned prior to securing the pivot base on the
abutments23, while the outer ends of the spiral springs
coil. The end of the coil is placed beneath the pivot base
are mounted on relatively ?xed outer abutments 27 frag
in contact therewith and the subsequent heating of the
pivot base in securing the same to the coil also functions 60 mentarily shown in FIGURE 1. In ‘accordance with
established practice, the spiral springs not only bias the
to solder together the pre-tinned base and coil lead.
coil to ‘a predetermined position, but also provide a con
An object of this invention is the provision of a method
ducting current path to the coil. Lead wires: 28 are shown
of soldering the end of a coil winding to a pivot base
secured to the abutments 27 for connection to a source,
which method includes placing the pro-tinned winding
end under the pre-tinned bottom of the pivot base and 65 not shown, to be measured. The current path from the
lead wires 23 may be traced through the spiral springs
heating the pivot base to thereby solder the coil wire to
26, ‘abutments 23, and pivot bases 12 to the ends of the
the base.
coil winding which are soldered to the pivot bases in a
An object of this invention is the provision of a mov
novel manner in accordance with my invention.
ing coil assembly comprising a wire wound coil and a
pivot base ‘assembly secured thereto, and means soldering 70
Reference is now also made to FIGURE 2 of t -e draw
the coil wire end to the bottom side of the pivot base
ings showing an exploded view of a joint between a coil
intermediate the pivot base ‘and coil.
and pivot base. For clarity, the parts and elements‘of
3,068,413
3
A
thermoplastic ‘or thermosetting type. ‘V‘Jith certain heat
reactive cements and with sufficient heat provided by the
current ?ow through the pivot base, the cement may be
?nally gelled or cured without further baking. With
(A
the connection have not been shown in proper relative
size; the drawing being intended merely to aid in an
understanding of the invention. ‘in securing the pivot
base to the coil, a thin layer of suitable cement 33’ is first
brushed onto the end turns of the coil 11 and the in UK
sulating member 1% is placed in position thereon. A
thin coating of cement, designated 32, is then spread
other cements, a further oven baking subsequent to the
above-described resistance heating process may be re
quired.
Obviously, both pivot bases may be simul
over the insulating member. The end of the coil wire,
taneously secured to the movable coil, at the same time
both coil leads ‘are being soldered to the pivot bases.
designated 11', which who has been pro-tinned as at 33,
is then placed on the insulating member 13 upon which 10 Since the soldering of the coil lead to the pivot base and
the securing of the said pivot base to the coil are simul—
the cement 32 has been spread. In accordance with my
taneously e?ected, it will be apparent that the prior art
invention, the bottom surface of the pivot base is tinned,
step of soldering the coil leads to the pivot bases after
as at 34., before the base is placed on the insulating mem
the pivot bases are secured to the coil is eliminated.
ber 19 upon which the cement 32 and tinned wire end
1i.’ have been placed. With the pivot base positioned on 15 Further, the resulting soldered connection is superior to
prior art arrangements since the contact is embedded in
the insulating member 19, in contact with t‘nc tinned
the cement and no corrosive effects of the ‘atmosphere
wire end, heat is applied to the pivot base to simultaneous
therein take place.
ly solder the coil lead to the pivot base and to set the
Having now described my invention in detail in ac
cement. A suitable method and apparatus for properly
locating the pivot base on the coil and of heating the pivot 20 cordance with the requirements or" the patent statutes,
various other changes and modi?cations will suggest them
base to set the cement and solder the coil wire to the base
are shown and described in the above-mentioned co
pending patent application Serial Number 23,228.
selves to those skilled in this art and it is intended that
A
such changes and modi?cations may be made without de
parting from the scope and spirit of the invention as set
fragmentary, semi-diagrammatical, view of a means for
locating the pivot base on the coil and including means 25 forth in the following claims.
I claim:
for passing an electrical current through the base to heat
1. A method of manufacturing a movable coil as—
the same is shown in FIGURE 3. In FIGURE 3, the
sembly of an electrical instrument of the movable coil
coil 1% is shown positioned upon a pedestal 36 or" a posi
type and which includes a wire-wound movable coil with
tioning ?xture. A plunger element 38, spring biased in
the direction of the arrow designated 39 and comprising7
loads and a pivot base secured to the coil, the said method
including tinning the coil leads and the bottom surface
a portion of the positioning ?xture, accurately locates the
A pair of
of the pivot base, spreading a heat reactive cement on the
electrodes 41, 41 are shown in contact with the pivot
coil, placing an insulating member on the cement, spread
pivot base 12 on the end turns of the coil.
ing a heat reactive cement over the insulating member,
base at spaced points thereon, the said electrodes being
connected through lead wires 42, 42 to the secondary 35 placing the bottom surface of the pivot base on the cement
spread on the insulating member with the tinned Wire
winding 43 of a transformer $4. The transformer pri
mary winding 46 is connected to a suitable A.-C. source
lead in contact with the tinned bottom surface of. the
47 through a switch 4-3. As described above, a thin layer
pivot base, and heating the pivot base thereby gelling
the cement and soldering the coil lead to the pivot base.
of suitable cement is applied to the coil, the insulating
2. The invention as recited in claim 1 wherein the pivot
member 19 is placed thereon, a thin layer of suitable
base is heated by passing an electric current therethrough.
cement is applied to the insulating member and the tinned
3. A method of manufacturing a movable coil assembly
pivot base is placed thereon with the tinned coil lead in
of an electrical instrument of the movable coil type and
contact with the pivot base. The coil assembly is then
which includes a wire-Wound movable coil With leads and
placed in the positioning ?xture to properly locate the
pivot base (or both bases simultaneously) on the coil. 45 a pivot base secured to the coil, the said method includ—~
ing tinning the coil leads and the bottom surface of the
With the electrodes 41, 41 in place on the pivot base,
the switch 48 is closed and an electric current is passed
pivot base, spreading a heat reactive cement on the coil,
placing the bottom surface of the pivot base on the cement
through the said pivot base. A current ilow of 20
spread on the coil with the tinned wire lead in contact
amperes for about 0.5 second has been found to provide
with the tinned bottom surface of the pivot base, and
the necessary amount of heat to properly gel one par- '
heating the pivot base thereby gelling the cement and
ticular epoxy resin type cement. The heat thus provided
soldering the coil lead to the pivot base.
simultaneously solders the tinned wire end 11’ to the bot
tom tinned surface of the pivot base and gels, or cures,
the cement su?iciently to keep the pivot base in place on
the coil.
With the coil lead ‘11’ positioned beneath the pivot
base, my invention is particularly applicable to an ar
rangement wherein the coil wire is of a small size since
a large wire would possibly permit “rocking” of the pivot
base thereon. In one application, a coil wire of .061" 60
diameter is used with an insulating member 1? having a
thickness of .003”, which Wire is sufficiently small to
embed in the cement and insulating member to thereby
permit a stable mounting of the pivot base on the coil.
It will be understood that my invention is not limited
to any particular type cement since any suitable heat re
active cement may be used. The cement may be of the
References Cited in the ?le ‘6r this patent
UNITED STATES PATENTS
2,425,443
So-reng _______________ __ Aug. l2, 1%!
2,735,068
2,890,416
Wolferz ______________ __ Feb. 14, 1956
Walker _______________ __ June 9, 1959
2,953,673
Bouton ______________ __ Sept. 20, 1960
576,801
Great Britain _________ __ Apr. 18, 1946
FOREIGN PATENTS
OTHER REFERENCES
Publication, Selectacon, Engineering Bulletin No. 9, by
Tape Cable Corp, Rochester, N.Y., November 1958.
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