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Патент USA US2132617

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Oct- 11, 1933-
Original Filed June 25, 1931
5 Sheets-Sheet 1
Oct- 11, 1938-
Original Filed June 25, 1951
3 Shéets-Sheet 2
Oct. 11, 1938.
Original Filed- June 23, 1951
s Sheets-Sheet s
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m '
Patented Oct. 11, 1938
I 2,132,617;
.Tliomas R. Harrison, Wyncote, Ernest H. Grauel,.
Perkasie, and John E. Kessler, Gettysburg, Pa.,
assignors to The Brown Instrument Company,
Philadelphia, Pa., a corporation of Pennsylvania
, Original application June 23, 1931, Serial No.
546,290. Divided and this application Novem
her 4, 1936, Serial No. 109,124
4 Claims.
(Cl. 171-95)
The general object of the present invention is
to provide improvements in galvanometer con
struction, to the ends of simplifying and reducing
cost of manufacture, and of providing a desirably
5 simple and effective galvanometer assembly, hav
ing a maximum accessibility for adjustment and
servicing operations and a minimum of structural
features subject to failure in operation.
While a galvanometer embodying our improve
or supporting arm 41, hinge connected at 62 to an
instrument casing 24. The frame 41 and instru
ment mechanism arenormally received in and en
closed. by said casing, but when the front door of
the casing is opened, the frame 41 may be swung
on its hinges to move the instrument mechanism
out of the casing and thereby‘ make accessible the
portions of the mechanism .normally facing and
adjacent the rear wall of the casing. In the said
10_ “ments is adapted for use with advantage in vari
‘instrument, the galvanometer is mounted in a‘
ous relations and for various purposes, it may be recess 64 formed in the frame 41, and open at its
used with a special advantage in a potentiometer upper end and at its rear side, though in the
measuringinstrument which, because cf'its oper
normal operating condition of the instrument,
ating characteristics and the relatively large the galvanometer is surrounded by the walls of
15 number of operating parts which it comprises, is‘
an' enclosure formed in part by the member 41,. 15
relatively bulky, and imposes special spatial re
and in part by removable cover parts I24, I21,
strictions on the form and disposition of the gal
and I26, hereinafter described.
vanometer included in the instrument, and makes
The galvanometerassembly includes a plate 66,
it especially important that the. galvanometer detachablysecured against the ijront vertical wall
20 should be constructed and
rranged so that its
relatively delicate parts mayaiie readily separated
from the remainder of the instrument, when
of the recess 64 and forming the member through 20
which‘ the galvanometer assembly is normally
secured to the frame 41.
- necessary for repair, adjustment, or replacement
Special objects and advantages of the inven
tion are made apparent in the following detailed
description of an embodiment of the invention
illustrated in the accompanying drawings, of
Fig. 1 is a sectional plan, with‘parts broken
away and removed, of- a portion of a potentiom
eter instrument including a galvanometer con
:fructed in accordance with the present inven
The plate 66 is‘ provided with an aperture 61
through which a screw 66 extends to secure the
plate 66 to the frame 41. Projections 68 are, 25.
provided on that surface of the plate 66 adjacent
the surface of the instrument frame and ?t into
recesses in the frame 41, so as properly to align
plate 66 when secured in place. Plate 66 is pro
vided with pins 69 which extend into recesses (not 30
shown) in pole pieces 60 of the galvanometer
horse shoe magnet 64, thereby properly position
ing the pole pieces. The pole pieces 60 are pro
vided with threaded recesses 6| into which bolts
62 are screwed,_the bolts passing through aper 35
away and in section, of a portion of the instru ' tures 63 in the magnet 64 and securing the mag
Fig. 2 is a front elevation, with parts broken
ment shown in Fig, 1;
Fig. 3 is a plan view of the galvanometer enclo
sure partly broken away and in section to illus
trate the galvanometer zero adjustment mecha
Fig. 4 is a perspective view of the galvanometer‘
assembly, with the parts separated for clearance;
Fig. 4a is an enlarged reproduction of a portion
45 of Fig. 4 illustrating the galvanometer pointer
and coil structure;
Fig. 4b is a section on the line 4b—4b of Fig. 4a;
net 64 to the pole pieces 60. A hook‘ 66 extends
over .the magnet 64, and through an aperture 66
in plate 66, and the magnet 64 is clamped to the
plate 66 by the nut 61 applied to the threaded end 40
of the hook 65. Studs 68Uextend through aper
tures 69 in plate 56 and are threaded into pole
pieces 60 to secure the pole pieces to the plate 56,
the pole piecesbeing provided with apertures ‘III
through which the ends of studs ‘68 extend.
The ends of studs 66 are arranged to pass
through apertures ‘II in a Bakelite molding ‘I2.
Fig. 5 is a front elevation of the galvanometer , The studs 66 are provided with recesses ‘I3, adapt
? ed to accommodate notches ‘I4 in clamping bar
Fig. 6 is a rear elevation of the galvanometer
unit; andN»
Fig. 7 is a perspective view of a molding form
ing an element of the galvanometer assembly.
In the embodiment and use of our invention
illustrated in the drawings, the galvanometer
forms a part of a potentiometer instrument dis
closed in our prior application, Serial No. 546,290,
filed June 23, 1931, of which the present applica
tion is a division.
(See Figs. 4 and 6.)
When the plate 66, 50-.
pole pieces 60, magnet 64, and Bakelite molding
In said instrument, the bulk of
60 the instrument mechanism isvmounted on aframe
‘I2 are in assembled relation, the bar ‘I6, when»
turned into clamping position with respect to
studs 66, secures the Bakelite molding to the
magnet system.
The bar ‘I6 is mounted on the‘.
Bakelite molding 12 for rotation by bolt ‘I6. The
bolt ‘I6 extends through passage ‘II in core ‘l6 '
adapted to ?t within Qthe galvanometer coil and
provide a uniform electro-magnetic ?eld in which
the galvanometer coil may move.
The Bakelite ‘
, 2,132,617
with aperture 8| through which the bolt ‘I6 passes.
spring I03 is formed with, an extension IIO to
which a bushing I I I is secured in such position as
to be in axial alignment with the pivots I08 when
the spring I03 is secured to its arm 'I0'I by pro
Suitable securing means, such as washer and nut
82, are threaded on the end of the bolt ‘IE to se
may be secured to the corresponding spring I03
molding is provided with ‘a projection ‘I9 having a
face 80 shaped to receive and support the core
‘I8 and the body of the molding ‘I2 is provided
cure the core ‘I8 in place.
The bolt 16 is pro
vided with a recessed projection 83 over which
the aperture 84_of the bar ‘I5 ?ts and which
10 accommodates a cotter 85 to secure the bar ‘I5
into position on the end of the bolt ‘I6.
The molding ‘I2 has upper and lower exten
sions 86 provided with shoulders 81 and ways 88
respectively adapted to receive and guidably sup
15 port upper and lower ?ttings 89 for motion lon
gitudinally of the extensions 86. Each ?tting 89
is provided with an offset 90 which contacts with
and rides along the faces of the shoulders 81.
The face or body portion 9I of each ?tting'89,
?ts into the way 88 of the molding. The offset
90 of each ?tting 89, cooperating with shoulders
81, and the corresponding face 9I, cooperating
with way 88, support the ?tting 89 against lateral
jection I06‘from the latter.
Each bushing III '
by welding or in any other suitable manner.
Each bushing III receives a ferrule II2 which is
secured thereto by means of screws passing
through the bushing or in any suitable manner. 10
A suspension wire or strip H3 is secured to each
ferrule I I2 as by soldering. A ferrule at the coil
adjacent ends of two suspension wires H3 ‘is se
cured to upper and lower bosses II4_, fastened as
by welding to sheet metal clips II5 which are 15
bent around the top and bottom portions of the
galvanometer coil II5a to 'rigidly connect the
galvanometer coil and bosses. One of said clips
I I5, the upper one as shown, is provided with an
integral projection having at its end an uprising 20'
edge H6.
The same clip H5 is provided with a
projection II'I extending in the opposite direc
tion from the ‘?rst mentioned projection, to which
is secured, as by welding, a leaf spring II8 form
ing an extension of the pointer II9 of the gal 25
lug 92 having a threaded aperture 93 into which , vanometer. The spring H8 is provided with
aperture I28 through which boss II4 extends.
is threaded a thumb screw 94. The shaft of the
The spring H8 is provided with a ridge or like
thumb screw 94 extends through a correspond
ing aperture 95 in the Bakelite molding ‘I2. The edge forming surface I2I adapted to cross and
rest upon the edge H6. The point of contact 30
30 end of each thumb screw 94 is provided with a between edge H6 and ridge I2I affords a single
recess into which ?ts a cotter 96 for securing the
thumb screw against longitudinal movement with point of hearing about which the pointer II9 may
respect to the molding ‘I2, and for limiting the ‘be moved slightly during the hereinafter men
movement with respect to the corresponding ex
25 tension 86. Each ?tting 89 is provided with a
movement of the corresponding ?tting 09 along
35 longitudinally of the corresponding‘ thumb screw
94. Rotation of each thumb screw 94 shifts the
corresponding ?tting 89longitudina1ly of the ex
tension 86. Each ?tting 89 is provided with a
threaded aperture 91 to receive a screw 98 pass
40 ing through a clip 99, having ears I00 which ride
on the face IOI of the corresponding extension
86. The clips 99, when secured in place by the
screws 98, afford additional support against lat—
eral movement for the ?ttings 89.
Each clip 99 and screw 98 serve an additional
function in that they form means used in con
necting the galvanometer leads, or terminal con
ductors, 99' and 99'.'., to the galvanometer coil or
winding, as shown in Figs. 2 and 6. As ‘shown in
Fig. 6, an electrical connection is made between
each clip 99 and the galvanometer suspension by
a corresponding conductor I02 secured to the clip
99 as by soldering, or any other suitable means,
and secured to the corresponding spring I03, to
which the corresponding galvanometer suspen
sion part is connected, by a soldered or other
, suitable joint between the conductor I02 and a
tioned operation of the mechanism for gauging
the position of the galvanometer, thus providing
a single point of support between the galvanom
eter pointer and edge “6, whereby wabbling of
the pointer and distortion of the suspension sys
tem due to force acting on the pointer, is pre- ‘
vented, which is especially important because the
gauging operation tends to set the pointer into
vibration at the time of releasing the pointer.
The contact between edges H6 and I'll damps
the pointer oscillations and quickly brings the
pointer to rest. The clip I I5 to which the pointer
H9 is secured, is provided with a threaded rod
I2'I' projecting laterally of the coil in line with
the pointer which carries the nut I22 threaded .
thereon for adjustment to balance the weight of
the pointer II9.
As will be observed in Figs. 5 and 6, the parts
shown in displaced relation in Fig. 4, when as
sembled, are so arranged that the galvanometer
coil II5a extends about the core 18 and is sit
uated between the poles 60 of the magnet, the 55
whole system comprising the galvanometer sus
bent lug portion I04 of spring I03.
pension, core, magnet, and poles being clamped
together by bolts‘ 68 and cooperating parts. The
?tting 89.
galvanometer coil supporting clips, rest in a pair
Each spring I03 is provided with an aperture ' molding _‘I2, as shown in Fig. '7, is provided with
four troughlike Idepressions I23, so positioned 00
which ?ts over a projection *I06 carried by
arm_ I01 pivotally mounted as by means of pin that when the movable system of the galvanom
I08 on the lug portion I09 of the corresponding eter is being assembled, the bosses, II4 on the
Each spring I03 is secured in place
upon the corresponding arm I01 by turning over
65 the projection I06, or in any other suitable man
ner. The pivotal mounting of each arm I0'I on
the corresponding lug I09, provides for adjust
ment of the galvanometer suspension about its
axis in order to properly position the galvanom
eter suspension with respect to the zero point as
determined by the other parts of ‘the, instrument
with which the galvanometer suspension is asso
In order that movement of each arm I0'I
about'its pivot I08 may provide only rotational
adjustment of-the galvanometer suspension, each
of the recesses I23, and the ferrules II2 distant‘
. from the galvanometer coil rest in the other pair 05
oh'ecesses I23. Recesses I23 provide convenient
supports for the parts mentioned to facilitate the
assembling operation.
It is apparent from the foregoing description,
by this invention there has been provided a
markedly simpli?ed form of galvanometer con
struction employing molded and stamped parts,
which in molded and stamped form inter?t to
provide a complete assembly affording a maxi
mum of adjustability together with marked sim
7 2,132,617
plicity of construction, affording facility of ‘man
ufacture and assembly at a minimum cost. The
galvanometer unit is so constructed that it can
be assembled as an independent unit comprising
those parts illustrated in Fig. 4, the single unit
being shown in Figs. 5 and 6, which may be
secured on the instrument "frame in proper re
lation with the other parts of the instrument by
in as they form no part of the invention claimed
herein, and are fully disclosed in our parent
application Serial Number 546,290. It is to be
noted, however, that the features of galvanom
eter construction and arrangement claimed here
in are well adapted for the ready and effective
association with the galvanometer, of a suitable
gauging mechanism, and that the galvanometer
a single screw 55 passing through the aperture pointer and they means for supporting the gal
The unit is arranged for facility . vanometer coil, are well adapted to withstand 10
10 _51 in plate 56.
in inspection, dismantling, service and repair.
The recess 54 in the instrument frame or arm
41 on which the galvanometer unit is mounted,
is provided with a rear cover I24 v(see Figs. 1, 2,
15 and 3), which is adapted to ?t onto the walls of
the recessed portion of the frame by spring ac
tion, and can be removed manually when the
instrument frame is swung out of the casing,
making the back of the frame available. A cap
20 I 21 (Figs. 1, 2, and 3) closes the top of the re
cess and rests upon the top edge I26 of the
recess 54, closes the top of the recess space
proper, and forms the top and side walls ofan
upper horizontal front extension of that space.
25 The extension space I25 receives the galvanom
eter pointer H9 and cooperating pointer posi
tion gauging mechanism. A front cover part I28
forms the front of the cap I21 and is provided
with a window through which the galvanometer
30 pointer and the pointer gauging mechanism may
be viewed.
As shown in Fig. 3, the cap I21 rotatably car
ries in apertures formed therein, a shaft I29
which extends through the front of the cover
v35 I28, its exposed end being provided with a kerf.
Shaft I29 carries on its other end a gear I3I
meshing with gear _ I32, the axle of which is
the shock' and vibration resulting from they
clamping and release of the galvanometer point
er in the gauging operation. The portions of the
member 41 adjacent the recess 54 and extension
space I25, and the cover parts I24, I21 and I28, 15
form a closed housing for the galvanometer unit
and 'associatedgauging mechanism unit, afford
ing ready and complete access to those units
together with protection from external influences.
While we have herein illustrated and described 20
a preferred speci?c embodiment of the invention
herein claimed, variation may be made in de
tails of construction and arrangement of the
embodiment illustrated‘ without departing from
the spirit and scope of the invention as de?ned 25'
in the followingv claims.
Having now described our invention, what we
claim as new and desire to secure by Letters Pat
ent is:
1. In a galvanometer of the d’Arsonval type, 30
the combination with the galvanometer coil and‘
suspension system, of a molding of insulating
material, means for mounting the system on
the molding including springs for tensioning the
system and means for adjustment of the system 35
relative to the molding in one direction, said
first mentioned means and ‘molding being rela
journaled in the bushing I33 molded into the
tively adjustable for adjustment of the system
material of the cap. When the galvanometer
unit is mounted in position upon the instrument
frame, and when the cap and associated parts
are mounted in position, the axle of gear I32 is
in axial alignment with pivots I08 and the gal
vanometer suspension. The spring I03 carried
relative to the molding in a second direction.
2. In a galvanometer of the d’Arsonval type,
45 upon the upper ?tting 89 by an arm I01 ro
tatable about pivot I08, is provided with an up
ward ‘extension I34 having a'ridge I35 formed
therein, which, as shown in Figs. 2 and 3, is
adapted to extend between teeth of the gear
50 I32, so that rotation of gear I32 bv manually
effected rotation of, shaft I29, will transmit angu- '
lar motion to the upper spring I03 and gal
vanometer suspension connected thereto, about
the axis of the suspension. Such adjustment
55 of the galvanometer suspension about its axis
is provided to set the pointer to the zero posi
tion- relative to the other parts of the instru
ment, when no current is ?owing through the
galvanometer. The construction of the zero ad
60 justing means of the galvanometer ‘is simple,
trouble free, easy to make, conveniently arranged
‘for operation on the instrument, and readily
assembled and available for servicing.
The previously mentioned pointer position
gauging mechanism, shown in part in Fig. 1,
comprises parts co-acting periodically to clamp
the galvanometer pointer II9 against de?ection
and acting through an arm I13, carried by a rod
the combination with aigalvanometer coil and
suspension system, of a molding of insulating
material, and means for mounting the system
on said molding including springs for tensioning
said system and including means for adjustment 45
'of the angular position of the system relative
to the molding, said first mentioned means and
molding being relatively adjustable to vary the
positions of said springs relative to said mold-.
ing and relative to each other.
3. In a galvanometer, a movable galvanometer
ment connected to said clip, a leaf spring ex
tending from said clip in a lateral direction rela
tive to the coil, a pointer secured to the leaf 55
spring, and a supporting member on said clip
and having an edge extending transversely to
the direction of the plane of ?exure of the leaf
spring, said spring being provided with a nar
row surface arranged to extend transversely of, 60
- and rest on, said edge.
4. In an instrument, a galvanometer coil and
suspension, a molding, means adjustably sup
porting the suspension on the molding, a mag
net, a plate, an instrument frame, means for 65,
removably uniting the plate, the magnet, and the
molding into a unit, and means cooperating with,
said plate and frame for securing said unit to
or shaft I14, to adjust the latter into an angu- - the frame.
70 lar position depending upon the de?ective po
sition of the pointer I I9 at the time. The con
struction and mode of operation of the gauging
mechanism need not be further referred to here
coil,,a clip secured to said coil, a suspension ele
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