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Патент USA US2131554

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Sept' 27, 1933-
J. DEv RAYVILLÈ
HYGROMETER
2,131,554
‘
Filed Feb. l, 1936
»ma
ATTORNEYS
Patented Sept. 27, 1938
2,131,554
UNITED STATES PATENT OFFICE
2,131,554
HYGROMETER
Jean De Rayville, New York, N. Y.
Application February 1, 1936, Serial No. 61,936
13 Claims.
The invention relates to hygrometers.
' One of the objects of this invention is to pro
vide a simple, practical and dependable device for
indicating, or responding to, the factor of humid
5_ ity of an atmosphere. Another object is to pro
vide a hygrometer construction that will be
simple and inexpensive to manufacture, capable
of ease and rapidity of assembly‘and capable of
being quickly and easily set or adjusted. Another
10. object is to provide a construction ofthe above
mentioned character in which acceptable accu
racy of indication or response to the humidity
factor of an atmosphere may be achieved without
requiring high or expensive degree of precision
15. in manufacture. Another object is to provide an
instrument of the above-mentioned character
which will be substantially self-adjusting under
certain conditions liable to be met with in prac
tice. Another object is to provide an instrument
20 of the above-mentioned character in which the
various degrees of humidity to which it is re
sponsive may be conveniently and easily indi
cated visually. Another object is to provide an
instrument of the above-mentioned character
25 which in general will be well adapted for inex
pensive and quantity production in which vari
ous parts may be easily and inexpensively manu
facture-d and assembled and which will also have
the features of adequate strength and durability
30 of construction and of adequate reliability of ac
tion. Other objects will be in part obvious or in
part pointed out hereinafter.
The invention accordingly consists in the fea
tures of construction, combinations of elements,
and arrangements of parts as will be exemplified
in the structure to be ’hereinafter described and
the scope of the application of which will be indi
cated in the following claims.
'
In the accompanying drawing in which is
40 shown one of the various possible embodiments
of my invention
Figure 1 is a front elevation of the instrument
on a small scale, certain parts being broken away;
45
Figure 2 is a front elevation as seen with the
front or cover and certain other parts removed,
thereby to show certain interior parts more
clearly;
_
» Figure 3 is a sectional view as seen substan
5
tiallyalong the line 3-3 of Figure 1, the plane of
' the section being also indicated at 3-3 of Figure
2 in order thereby better to correlate these three
figures, certain parts of Figure 3, however, being
shown in elevation;
5,5 Figure 4 is a fragmentary perspective view
(Cl. 73-337)
showing thel construction of certain elements of
the instrument structure;
Figure 5 is a sectional view -as seen along the
line 5-5 of Figure 3, and
, '
`
l
‘ Figure 6 is a fragmentary'detached view show
ing the construction of the sliding connection be
tween certain of the parts.
`
Similar reference characters'refer tov similar
parts throughout the‘several views in the draw
mg.
>
`
10
Referring now tothe drawing and more par
ticularly to Figures 1 and 3, the instrument has a
suitable enclosure which is preferably cylindrical
in shape and preferably comprises a casing gen
erally indicated at I0 (Figure 3), the casing hav 15
ing cylindrical walls II closed at one end by an
end wall l2, the casing I 0 being preferably of
sheet metal and hence lending itself readily to
drawing or stamping into the desired shape; the
end wall I2 would appear as the rear wall (not
shown) in Figure 1. The cylindrical side wall
Il` has secured to it a suitable standard or base
I3 (Figure 1) by means of which the instrument
may be> stood up as on any suitable horizontal
supporting surface, such as a table, shelf, or the
like, though, of course, any other suitable means
may be employed for mounting or supporting the
ultimate instrument where and in any manner
desired.
The forward portions of the cylindrical side 30
walls II, appearing as the upper portions in Fig
ure 3, are stepped or flanged as at I4 in order
telescopically to seat thereabout the cylindrical ~
side flange I5 of the casing cover generally in
dicated at I6, the latter having a disk-like front
face I'I forming, in effect, the front end wall of
the enclosure Ill-I6. The cover I6 is also pref
erably made of sheet metal and may be easily
stampedy or `drawn into the form described.
.The enclosure portions I0 and I6 are preferably
detachably connected and, moreover, and pref
erably, in a mannerV to permit a certain amount of
rotary adjustment or movement therebetween;
for this purpose two or more bayonet joints indi
cated at I8 and I9 in Figure 1 may be employed,
the respective parts of which being related to the
flanges I4 and I5 in any suitable or known man
ner. Thereby assembly or disassembly of the
enclosure portions I0 and I6 may easily be had
while the pin and slot connections of the bayonet
joints are made of such lengths, as will later be
seen, as to permit the cover I6 to be manually
adjusted or rotated relative to the casing I0, all
for a purpose also later described.
At preferably the center of the disk-like rear 55
2,131,554
2
or end wall I2 (Figure 3) there is secured rigidly
but preferably detachably a post 20, preferably of
metal, and, as is better shown in Figure 5, the
post 20 is provided with two diametrically op
posed longitudinally extending slots 2| and 22.
Into these slots are received the moisture- or
humidity-responsive elements 23 and 24, respec
tively, being secured to the post 20 in any suit
able manner as, for example, by wedging them
into the slots or by clamping them therein, such
action being achievable by pressing the opposed
walls of the slots toward each other. As will
later be seen, numerous features of my invention
can be carried out by the use of only one of the
elements 23, 24 but because, due to certain otherfr
features of my invention, I am enabled to bring
into action forces acting by way of a mechanical
couple, I therefore prefer to employ, and hence
I show in my preferred embodiment, two mois
20 ture-responsive or hygroscopic elements 23--24.
The latter elements are preferably each made
of two coacting members differently responsive to
changes in humidity, and in Figure 4 I have
shown in fragmentary perspective a possible mode
25 of construction of these elements. The elements
are sheet-like in form or shape and each com
prises two sheet members A and B secured to
gether, face to face, as shown in Figure 4. For
example, one sheet member, such as member A,
may be of a relatively thin sheet of wood, the
sheet being cut lengthwise of the grain and illus
tratively being of a thickness on the order of 0.01
inch. The wood employed may be any suitable
wood that is suitably hygroscopic and initially is,
for assembly purposes, treated to be substantially
dry.
The other element B may comprise any
suitable bendable or flexible material that is non
hygroscopic; it may, for example, be waterproofed
paper and the two members A-B are secured
together face to face by any suitable adhesive
that is non-hygroscopic. Preferably the material
of element B has a temperature coeflicient of ex
pansion, as compared to that of the element A,
that temperature changes have no or a negligible
effectV on the action of the combined elements.
The member B, however, may also be of wood and
in such case it is cut preferably >thinner than
member A, being of a thickness on the order of
0.001 inch, as compared to the above-described
thickness of the wood member A, and being in
such case a sheet of wood cut, however, length
wise of the grain, the two members A-B being
secured together back to back as above described.
Any suitable adhesive may be employed that is
substantially non-hygroscopic, such as rubber
cements, celluloid or cellulose cement composi
tions, adhesives such as are used in so-called
“dry mounting” work, and the like. Where both
members A and B are of wood, I prefer to employ
holly wood. In any case, the parts A and B are
secured together, preferably under pressure,'but
in such condition that they are free from mois
ture content and hence preferably oven dry.
The elements 23 and 24 are so related to the
stationary cr ñxed post 20 that the grain of mem
ber A of each element runs in a direction parallel
to the axis of the post 20, that axis being, as will
later be clear, the axis about which the elements
23 and 24 curve or bend or flex lunder the effects
75
of the moisture inthe atmosphere. In Figure 3
the direction of the grain of member A of'element
24, is clearly shown, as just. described.
Where member B of these elements is made of
wood, it is so related to the member A that its
grain extends in the direction of a radius ema
nating from the axis of the post 20, it being thus
clear that the grains of members A and B of each
of the elements 23, 24 extend transversely of each
other. Thus, the .grain of member B of element
23 is shown in Figure 3 as extending radially and
that direction of grain is true also of the member
B in back of the member A of element 24.
With this arrangement and construction of the
elements 23, 24, the latter bend or warp or ñex or
curve about the axis of the post 20, thus giving the 10
outer ends of the members 23, 24 a motion of `
translation along a curved path. This motion of
translation is communicated in ampliñed form to
certain indicating means to which reference
might first be made before describing the manner 15
and means in which such motion is transmitted.
Accordingly, and referring again to Figure 3,
the face or end wall .I1 of the cover I6 carries an
inwardly directed stud 21, secured thereto in any
suitable manner and substantially at its center, 20
the axis of the stud 21 and the axis of the post 2U
being in alinement or coincident, the stud 21 hav
ing a head 28.
The stud 21 serves as a shaft for
a bushing 29 to which is secured an elongated
sheet metal cross-member generally indicated at 25
30, member 30 being thus rotatably mounted by
bushing 29 upon the stud 21, its length, as is
better shown in Figure 3, being slightly less than
the inside diameter of the enclosure lli-I6 so
that it may freely rotate within the enclosure.
Its two arms, each to one side of the hub or
bushing 29, are provided with radially extending
slots 3|, 32, as is better shown in Figure 2, for a
purpose later to be set forth.
Resting upon the cross-member 30, as viewed
in _Figure 3, and thus positioned in front of the
later, as viewed in Figure 2, is a disk-like dial 33
of a diameter of less than that of the enclosure
Ill-I6 (see Figure 3) and made of any suitable
light sheet material, such as light sheet metal, 40
suitable cardboard, celluloid, or the like, and it is
apertured at its center so as to be received upon
the bushing or hub 29l (Figure 3) relatively
loosely; the dial 33 may thus be easily given a
rotary movement relative to the hub or bushing 45
29 and hence relative to the cross-member 30.
The dial 33 is to be rotated or driven in re
sponse to rotary movement of the cross-member
30 and the driving connection between these two
members is preferably a friction clutch type of
connection constructed in any suitable manner to
cause the cross-member 30 to swing or rotate the
dial 33 but to slip or yield when the load becomes
greater than that represented by the dial disk 33
alone, for a purpose later described.
A suitable
and illustrative driving connection of this type
may comprise spring-like tongues 34 and 35 (Fig
ures 1 and 3) attached to or integrally formed
with the cross-member 30, ythe two tongues ex
tending upwardly fromV the plane of the cross 60
member 30, as viewed in Figure 3, and being bent
into overlapping relation with respect to the dial
33, the springiness of the tongues being so ad
justed that the corresponding diametrically op
posed peripheral portions of the dial are gripped
between the tongues and the cross-member 30,
frictionally, so that the `dial 33 has to follow the
rotary movements of the cross-member 30; how
ever, if the dial 33 is physically halted or stopped.
the cross-member 30 may continue to rotate but 70
now relative to the halted disk 33, the tongues
34-'35 permitting slippage to take place.
The dial 33 is provided with graduations
throughout a suitable portion of its periphery, as
shown in Figure 1, graduated from 0 to 100, 15'
2,131,554
3.
representing the possible range of humidity vari
ations of the atmosphere, the numerical gradua
tioned >therealong and to the same relative posi
tions representing percentage relative-humidity
Accordingly, as the elements v23, 24 bend or
flex or warp in response to, for example, an Jin
crease in the moisture content in the atmosphere,
the enclosure Ill-16 having suitable openings 41
or moisture content of the atmosphere. If de
sired, the central portions of the dial 33 may be
cut out, as indicated in Figure 1, to decrease the
weight of the dial, giving it a spoked' effect, as`
shown.
The range of graauations from 0 to 100% on
10 the dial 33 is, moreover, and preferably, divided
into three areas or arcs, each of suitable extent
and of a distinctive color.
Thus, in Figure 1,
the arcuate range C from 0 to about 40 may be
colored red; the arcuate range D from about 40
to 60 may be colored white; and the arcuate range
E from 60 to 100 may be colored blue.
’
These colored ranges and the graduations are
made visible through the front wall I1 of the cover
I6 by means of a window 36 (Figure 1) of suit
able radial and arcuate extent and, `furthermore,
the front wall l1 carries two arrow heads 31,
38 pointed toward each other and alined along a
radius and exposed through the aperture 36, as
shown in Figure l, the aperture 36 being closed
by a suitable transparent member 38 which Amay
be of glass, mica, celluloid, or the like.
As the dial 33 is thus rotated in back of the
front wall I1 or is brought to a stop corresponding
to the reaction of the elements 23, 24fto the mois
30 ture content of the atmosphere, the specific per
centage indication on the dial may be read oiî or
seen as indicated by the arrow heads 31-38
while, for more distant observation, the color of
the particular range of the lranges C, D and E
(Figure 2) is visible through the aperture 36` to
give a general indication as to whether the hu
midity is subnormal, normal or abnormal.
Recurring now to the driving connection be
tween the elements 23, 24 and the dial 33, refer
40 ence may now be made to >Figures 2 and 3 from
which it will be seen that there are attached to
the free ends of the elements 23 and 24 levers 43
and 44. These levers are made of any suitable
light material, such as light or thin sheet metal,
and are in general arcuate, as viewed in Figure 2,
having an arcuate extent of roughly 90°. 'I‘hey
are rigidly attached to the freeends of the ele
ments 23, 24 preferably by means of U-shaped
sheet metal portions 45 and 45, respectively (Fig
ures 3 and 5), the latter being of sufficient
strength or thickness so that their flanges can be
pressed inwardly toward each other and thus de
pendably and securely clamp the respective ele
ments therebetween, the levers 43 and 44 being
rigidly secured thereto at their upper ends, as
viewed in Figure 3.
The otherwise free or `unanchored ends of the
arcuate levers 43, 44 are provided with normally
radially extending extensions 43a and 44a, respec
60 tively, substantially as shown in Figure 2, where
the parts are all seen in their interrelations when
the elements 23, 24 are still dry or correspond to
a dry atmosphere. By means of these extensions
43a and 44a sliding connection is made with the
' slots 3| and 32, respectively, in any suitable man
ner, as, for example, is shown in the detached
View of Figure 6; a pin 56 supported by the lever
extension by a suitable device, such as the de
vice 55 comprising two spring arms 552L and 55b
that clamp the extension therebetween, engages
in the slot and thus a sliding and pivotal connec
tion is made with the extension of the arcuate
lever. Both lever extensions are graduated so
that the two devices 55 may be adjustably posi
tion.
-
i
(Figure 3) to permit ingress of the atmosphere,
the arcuate levers 43, 44 are given a composite
motion which is'the resultant of a movement of
translation, in counterclockwise direction, as 10
viewed in Figure 2, of the respective ends of the
elements 23, 24, and a swinging inwardly toward
the center of the mechanism in response to the
bending of the elements 23, 24 and due to the
rigid connection of the arcuate levers to their 15
respective moisture-responsive elements.
,
In Figure 2 the elements 23, 24 with their re
spective arcuate levers are shown in broken lines
in the positions they occupy at the other extreme 1
of response, namely to indicate 100% humidity, 20
and it will be seen that the arcuate levers crossA
eachother, the one tending to be wrapped aroundl
or against the central axis of the mechanism on
one side thereof and the other to the other side of
that axis; and to permit the arcuate levers to 25
overlap or thus cross each other without inter
ference, they are stepped as at 43b and 44h, re
spectively (see Figure 3).
,
~
And as the parts undergo a transition in >one
direction or the other from the two extreme posi
tions shown in Figure 2, in response to corre
sponding changes in humidity, or undergo transi
tion from either of these extremes to some inter-_
mediate position, the corresponding movement of
the respective ends of the elements 23 and 24, as
well as degree or extent of their flexing, is am
pliñed or multiplied by the coaction therewith of
the arcuate levers 43, 44 in coaction again with
the sliding connections of the extensions of the
latter with the slotted cross-member 30, effecting 40
a rotation of the latter and hence a change in
rotary position thereof to correspond to the par
ticular flexing of the elements 23, 24 to a given
moisture condition of the atmosphere> to which the
apparatus is exposed. And the cross-member 30
in turn determines the rotary position of the dial 45
33, with respect to the indicating or arrow heads
31, 38 and the aperture 36 in the front face of the
instrument, as seen in Figure 1, the graduations
of the dial being, of course, calibrated to suit the
characteristics of the elements 23, 24 and to com 50
pensate, if necessary, for any non-uniformity of
motion transmission from the ends of the mois- ,
ture-sensitive elements to the cross-member 30
and dial itself.
`
_
ì
Referring now to Figure 1, the dial 33 has up 55
standing therefrom a radially extending stop
member 48 positioned substantially as shown and
itis adapted to coact with two stop' members in
the form of studs or pins 49 and 50 (Figures ll,
2 and 3) carried on the inner face ofthe front
wall I1 of the cover member I‘B, projecting in
wardly from the front wall I1 sufficiently to be
positioned in the path of rotary movement of the
stop member 48 as carried by the dial 33. `
'
These stop members are so spaced that, when 65
the dial 33 is rotated in clockwise direction, as
viewed in Figure 1, to bring the zero indication
on the dial in alinement withthe arrow heads
31, 38, stop member 48 on the disk engages the
stop member 49 and thus prevents overrunning
of the dial, while rotation of the disk in counter
clockwise direction to bring the other extreme
of the dial, namely the 100% indication, in aline
ment with the arrow heads 31, 38, brings the u
2,131,554
4,
stop `member 48> on the dial into abutting rela
tion to the other stop member 50, thus prevent
ing overrunning of the dial in that direction.
But this stoppage against overrunning of the
dial is effective only upon the dial itself butV im
poses no‘strains upon the operating «mechanism
or upon the elements 23, 24, for these parts-may
overrun the slight amount that may be neces
sary because of the friction clutch connection be
10 tween‘the cross-member 30 and the dial 33, as
above described. Accordingly, when this stop
page comes into action, cross-member 30 may
continue to move though this movement will be
a slight one ordinarily, while the indicating dial
33 is held against movement. These actions take
placeto eiîect a self-adjustment to compensate
for Variations or non-uniformity, sometimes un
controllable, in the manufacture of the clutch
sensitive elements for a quantity of instruments
and thereby I am enabled to» overcome such dif
ficulties sometimes inherent in the materials em
ployed and hence uncontrollable and hence also
I am enabled to avoid the need for high precision
of construction'and manufacture. Thereby cost
v
25 of production is materially lessened.
Furthermore, stoppage members 49 and 5S are
carried bythe cover member i6 which, it will
be recalled, is rotatably adjustable with respect
to the casing I0, due to the'bayonet joints I8, i9
30; above described, and the arrow heads 31, 38 are
likewise carried by the cover. Accordingly, upon
initial assembly or if necessary during the sub
sequent action of the instrument, a relative ro
tary adjustment between the cover IS and the
casing I0 may be made to make certain that
any overrunning or underrunning is the same at
both extremes of dial or humidity indication.
And since, for ordinary use, particularly for
household use, it rarely if ever is necessary to
- have indications of 0 or 100% humidity of the
atmosphere, due to the fact that these condi
tions rarely if ever occur in the atmosphere, I
am by the above means enabled to achieve sub
stantial correctness and accuracy of indication
throughout the intermediate ranges within
which, particularly in climatic conditions
throughout the United States, atmospheric hu
midity conditions generally fall.
Thus, it will be seen that there has been pro
50" vided in this invention an apparatus in which
the various objects hereinbef‘ore noted vtogether
with many thoroughly practical advantages are
successfully achieved.
As many possible embodiments may be made
55 of the above invention and as many changes-
might be made in the embodiment labove set
forth, it isto be understood that all matter here
inbefore set forth, or shown in the accompanying
drawing, is to be interpreted as illustrative and
so notin a limiting sense.
I claim:
'
'
`
1. In an instrument of the character described,
in combination, an enclosure comprising a cas
ing part and a cover part, means interrelating
said parts for relative rotary adjustment, said
cover part having a window therein and. having
two stop members, a dial bearing visual indica
tions rotatably carried by said cover part for
presenting an indication to said window accord
ing to the rotary position of the dial, said dial
having a stop member coacting alternately with
said two stop members, the latter being posi
tioned in the path of movement of said dial stop
member to prevent the dial from overrunning at
its two-extremes of movement, a rotatable mem
ber, means forming a 'driving connection'between
the latter and said dial, said driving connection
being capable of yielding or slipping upon halt
ing ofthe rotary movement of said dial by said
stop members, said rotary member being elon
gated and extending diametrically of said dial,
means supported in said casing and comprising
two radially extending moisture-sensitive ele
ments capable of changing their curvatures in
response to changes in moisture content of the 10
atmosphere, a pair- of arcuate levers each rig
idly attached to the end of one of said elements
and to be moved and swung in response to bend
ing of the latter, and means forming sliding
connections between the respective free ends of' 15
said arcuate levers and said rotary member,.
whereby movement of said levers is transformed
to rotary movement of said rotary member.
2. In an instrument of the character described,
in combination, an enclosure comprising a cas 20
ing part and a cover part, means interrelating
said parts for relative rotary adjustment, said
cover part having a window therein and having
two stop members, a dial bearing visual indica
tions rotatably carried by said cover part for
presenting an indication to said window .accord
ing to the rotary position of the dial, said dial
having a stop member coacting alternately with
said two stop members, the latter being posi
tioned in the path of movement of said dial stop 30
member to prevent the dial from overrunning at
is two extremes of movement, a rotatable mem
ber, means forming'a driving connection between
the latter and said dial, said driving connection
being capable of yielding or slipping upon halt
ing of the rotary movement of said dial by said
stop members, said rotary member being elon
gated and extending diametrically of said dial,
means supported in said casing and compris
ing two radially extending moisture-sensitive ele 40
ments capable of changing their curvatures in'
response to changes in moisture content of the
atmosphere, and motion-amplifying means
forming connections between said elements and
radial portions of said rotary member for caus 45
ing rotary movement of the latter in response to
curving of said elements.
3. In an instrument of the character described,
in combination, an enclosure comprising a cas-ing part and a cover part, means interrelating
said parts for relative rotary adjustment, said
cover part having a window therein and having'
two stop members, a dial bearing visual indica-'
tions rotatably carried by said cover part for
presentingr an indication to said window accord'
ing to the rotary position of the dial, said dial
having a. stop member coacting alternately with
said twol'stop members, the latter being positioned.
in the path of movement of said dial stop member
to prevent thev dial from overrunning at its two 60
extremes of movement, a rotatable member,
means forming a driving connection between theA Y
latter and said dial, _said driving connection being
capable of yielding or slipping upon halting of
the rotary movement of said dial by said stop`
members, saidV rotary ’member being elongated
and extending diametrically of said dial, means
supported in said casing and comprising two ra
dially extending moisture-sensitive elements ca
pable of changing their curvatures in response
to changes in moisture content of the atmos
phere, said rotary member having substantially
radially extending slots extending on both sidesk
of its axis, and driving connections havingslid
ableV engagement with said` slots for causing said
2,131,554
rotary member to respond toflexing of said ele
‘ ments in response to changes in moisture content
of the latter.
'
4. In an instrument of the character described,
Vin combination, an enclosure comprising a cas
ing part and a cover part, means interrelating
o
î `5
ment of the latter in response to change in shape
of the former.
'
7. In an instrument of the character described,
in combination, a supporting frame, a rotary
l member rotatablycarried by said frame and hav
ing portions extending to eachside of its axis,
said parts for relative rotary adjustment, said » means
supported by, said frame and comprising
cover part having a window therein and having
two moisture-sensitive elements capable of
two stop members, a dial bearing visual indica
10 tions rotatably carried by said cover part for
presenting an indication to said window accord
ing to the rotary position of the dial, said dial
having a stop member coacting alternately with
said two stop members, the latter being positioned
15 in the path of movement of said dial stop mem
ber to prevent the dial from overrunning at its
two extremes of movement, a rotatable member,
means forming a driving connection between the
latter and said dial, said driving connection being
'20 capable of yielding or slipping upon halting of
the rotary movement of said dial by said stop
members, said rotary member being elongated
and extending diametrically of said dial, means
supported in said casing and comprising two ra
25 dially extending moisture-sensitive elements ca
pable of changing their curvatures in response to
changes in moisture content of the atmosphere,
said rotary member having substantially radially
extending slots on both sides of its axis, arcuate
30 levers each anchored at its one end to a free
end of one of said elements, and means coacting
with said slots and forming respectively sliding
connections between the other ends of said levers
35
and said rotary member.
5. In an instrument of the character described,
in combination, an enclosure comprising a cas
ing part and a cover part, means interrelating
said parts for relative rotary adjustment, said
cover part having a window therein and having
40 two stop members, a dial bearing visual indica
tions rotatably carried by said cover part for
presenting an indication to said window accord
ing to the rotary position of the dial, said dial
45
having a stop member coacting alternately with
Said two stop members, the latter being positioned
in the path of movement of said dial stop mem
ber to prevent the dial from overrunning at its
two extremes of movement, means constructed to
exert a force in response to change in its moisture
50 content, means mounting said means in said cas
ing, and mechanism including an overload clutch
means for changing the rotary position of said
dial in response to changes'in said force.
6. In an instrument of the character described,
55 in combination, an enclosure comprising a cas
ing part and a cover part, means interrelating
said parts for relative rotary adjustment, >said
cover part having a window therein and having
two stop members, a dial bearing visual indica
60 tions rotatably carried by said cover part for
presenting an indication to said window accord
ing to the rotary position of the dial, said dial
having a stop member ooacting alternately with
said two stop members, the latter being positioned
65 in the path of movement of said dial stop mem
ber to prevent the dial from overrunning at its
two extremes of movement, a movable member,
means forming a yieldable driving connection be
tween said movable member and said dial, means
70 constructed to change its physical shape in re
sponse to changes in moisture content of the at
mosphere, means mounting said last-mentioned
means in said casing, and means forming a driv
ing connection between said moisture-responsive
means and said movable member to effect move
changing their curvatures in response to changes
in moisture content of the atmosphere, a pair of 10
levers each rigidly attached to the end of one of .
said elements so as to be moved and swung in
response to bending of the latter, and means
forming sliding connections between the respec
tive free ends of said levers and said portions of 15
said rotary member for effecting rotation of the
latter in response to the action of said moisture
sensitive elements.
8. An instrument as claimed in claim 7 in
which said frame carries also a scale and datum 20V
means, one of which is movable relative to the
other, and means forming a connection between
the one that is movable and said rotary member. f
9. An instrument as claimed in claim 7 in
which said frame carries datum means and scale 25
or dial means rotatable with respect to said
datum means, andvmeans forming a driving >con
nection between said scale means and said ro
tatable member.
'
10. A condition-sensitive unit comprising a 30
mounting post having a plurality of condition
sensitive elements mounted thereon and extend
ing radially therefrom each of said elements hav
ing rigidly mounted on the end thereof. an arcu
ate lever arm which has a radially extending 35
portion, a pin-like member adjustably mounted
upon each of said radial portions, a pivotal ele
ment mounted so as to rotate upon an axis in
line with said mounting post and having a .plu
rality of slots therein into one of which each ofv 40
said pins may move freely, whereby said pivotal
element is controlled in its rotary movement by
said condition-sensitive elements.
11. In an instrument of the character de
scribed, in combination, a condition-responsive 45
unit, a scale and datum means one of which is
mounted upon an adjustable member and the
other of which is a movable means and con
trolled by said condition-responsive unit, one of
said means also being provided with two stops> JO
and the other of said means being provided with
a single stop, said stops cooperating so as to
allow limited movement between said scale and
datum means, and a clutch mechanism, said _mov
able means being controlled by said condition
responsive means through said clutch mechanism,
and said stops and clutch mechanism cooperate
so as to automatically readjust said movable
means under certain predetermined conditions.
12. In an instrument of the character de 604
scribed, an enclosure comprising a casing part
and a cover part, said cover part having a win
down therein and being adjustable upon said
casing part, a condition-responsive unit within
said enclosure comprising a plurality of condi
tion-sensitive elements mounted upon a control
post in said casing, each of said elements ex
tending radially from said post and having
mounted upon the free end thereof a rigid arm
which carries a pin, a scale-carrying element' ro
tatably mounted and adjustably carrying a scale,
said scale-carrying element being provided with
a plurality of slots within each of which one of
said pins may move freely, whereby said scale is
6
2,131,554
normally controlled bythecooiperative actionof
said plurality of condition-responsive elements.
13._In apparatus of the class described, the
combination of, an indicating sheet, a= clutch
mechanism, a condition-sensitive element: com
prising two strips each of whichv has afiat face,
said strips being attached to each other in face
to-face relationship,V said element being mounted
with. a free end, said freeL end being attached by
means of said clutch mechanism to- said indicat
ing sheet, andl stop means operatively associ
atediwithsaid‘indicating sheet to limit the move- - 5
ment thereof and adjust said indicating sheet.
JEAN DE RAYVILLE.
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