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Патент USA US2123532

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July 12, 1938.
Filed June 11, 1936 '
3 Sheets-Sheet l
@ $207962] 0'r07
July 12, 1938.
Filed June 11. 1956'
s Sheets-Sheet 2
July 12, 1938.
2,123,532 .
Fil'e'd June 11, 1936
n._ E _:\ .
5 Sheets-Sheet 5
rZer£ £13.15’?
G’eofye. 2:75P”, ‘
12, 1938
sum-rm s-r-A'Tss' " PATENT‘- oFFicEJ
canoe ooas'raoc'rjion
pm Hastings, Brighton. and-George 1:. Ion],
Rochester, N.; Y., assignors to Rochester Man
ufacturing 00.. Inc, Rochester, N. Y.,_ a cor
, poratlon of New‘ York
Application June 11. 7193s,‘ sens: No. 84.682
10 Claims. (01. 73-110)
This invention relates to a gauge,v and more ’
particularly to a pressure gauge, although- many
features of the invention are applicable also to
gauges of other types.
An object of the invention is the provision of a _' Figurev 13 is a diagrammatic view illustrating . 5
generally improved and more satisfactory gauge the method of making the construction shown in
Fig. 12.
Another object is the provision of a gauge
which’ may be constructed economically and
10 quickly, which has few parts. and which is re
liable in operation.
A further object is .the provision of an improved
Fig. 12 showing one modi?ed construction of the
diaphragm means.
10 '
another modi?edconstruction of the diaphragm
The same reference numerals throughout the
several views indicate the same parts.
The gauge, in its‘preferred form. includes a
A still further object is the provision of a sim
plifled construction ‘for mounting a‘ needle or
pointer, and one which is particularly adapted to
a needle or pointer mounted for movement about‘
which_'contains the principal'operating .parts of
an axis concentric with the dial of the casing.
' To these and other ends the invention-resides
an annular inwardly extending wall 3| connected 20 _
in certain ‘improvements and combinations of
parts, all as will be hereinafter more fully de
scribed, the novel features being pointed out in
the claims at the end of the speci?cation.
Figure 14 is a view similar to a'fragment of
' Figure 15 is a view similar to Fig. 14 showing '
diaphragm construction, and of improved means
for holding the diapln‘agm in place.
Figure 12 isa sectionthrough the rear end of '
the gauge showing a preferred form of construc
tion of diaphragm means and holdingv means.
In the drawings:
~ '
the gauge. At the rear- end of this portion 10 is
to the forward edge of another cylindrical wall
portion 32, of smaller diameter. and shallower
than the portion 30. This cylindrical. wall por
tion 32 is adapted to receive the pressure respon
- sive diaphragm means. At the rear edgezof the 25
Figure 1 is a front view of a gauge constructed
in accordance with a preferred embodiment of
the invention;
casing having a main cylindrical portion 30,- , ,
Figure 2 is a front view of the-gauge on a larger
510' scale with the bezel and glass removed, and with .
portion'32 is an inwardly extending ?ange or wall
33 merging into a stem portion 34 which may be
threaded internally or externally as desired, for
connection to a’conduit, tank or other suitable
article subject to the pressure which the gauge is 30'
intended to indicate.
struction beneath.
Within the main chamber formed by the cylin- ,
drical-wall 30' is a-mounting plate 40 held in place
. ‘V Figure 3 is an elevation of.a fragment of the
by suitable means suchas the studs 4| passing
Figure 4 is a vertical section through the gauge, . through the plate and integral with’ the rear wall 35
the section being taken substantially on the line ‘ 3| of the chamber. Struck-up portions 42 of the
4-4 of Figure 2. ' ' l
mounting plate 40 form journals or bearings for
Figure 5 is a view similar to a fragmentof Fig. .a shaft 43 which extends approximately diametri
4 illustrating one form of bezel construction on a callywitlr relation to the casing 30,'as shown in
~10 larger scale than Fig. 4. '
‘ .
Figs. 10 and 11. Near its middle, the shaft 43 is 40
Figure 6 is a view similar to Fig. 5 showing a bent to providea crank portion 44 which overlies
modi?ed form of bezel construction for use on a a stud 45 mounted on the pressure responsive
gauge of the ilange type.
diaphragm, which will be described in greater.
Figure 7 is a fragmentary view showing a modi ' detail below. _
As the pressure responsive diaphragm moves 45
~i5 ?cation of ‘the needle mounting arrangement 01"
parts of the dial broken away to show the con
Figure 8 is a section through the gauge in a
plane at right angles to the plane of Fig. 4.
in response to pressurevariations, the stud 4!
moves-in a' direction axially of'the gauge and,
by .acting upon the crank-44, turns the shaft
43. A larger crank 41 at the lower end of the‘
shaft 43 is thus moved in accordance with the 50
Figure;10 is a section taken substantially on , movements of the pressure responsive diaphragm.
"I'he crank 4'! lies against one side ‘of and trans
the line lil—l0 of Fig. 4. “ _ '
Figure 9 is an edge viewer’ the ‘dial ‘and needle
50 assembly removed from the casing.
Figure 11 is a view‘ similar to a fragment of Fig. ' mits its movements to an 'arm 48 which is formed
10 with parts removed to show the construction as an extension of one arm. of a generally U
55 beneath.
shaped member 49‘ loosely pivoted on a bearing 55
pinvilsecured to the plate It. The other arm
of this U-shaped member 49 is extended at ‘I in
“ a general direction toward the center of the cas
ing 80, and this extension is provided with an
arcuate portion 52 having gear teeth concentric
with the pivotal axis 50 as shown in Hg. 10.
Thus, as the stud 45 of the pressure responsive
diaphragm is moved, the motion thereof will be
is shoved rearwardly into the
The 'posi-‘ ,
tion of the pin II in the hole .4 of the dial-plate
properly alines the dial plate in a circumferential
direction so that the dial plate cannot be placed
in an improper circumferential position.
This form of mounting is particularly advan
tageous in cases where the distance of the pin II
from the central axis of the gauge casing is like
transmitted to the gear segment II, but the gear , ly to vary a little bit due to inaccuracies of man
segment will ‘have'a greatly enlarged extent "of ufacture. If thenee'die shaft '1 and pinion ‘II
motion relativelyto that of the stud 45, not only were always mounted exactly at the axial center
because of the enlarging effect due to the size of the casing, it is apparent that a variation of
of the crank arm 41 relatively to the size of the
the pin lill farther from or closer toward the '
crank 44, but also because of the further enlal'8-'v ' center 'would result in too loose or too tight
meshing of the gear segment 52 with the pinion
ment 52 from the pivot ill with relation to the -. .10. With the present form of mounting, how
i ever, the position of the needle shaft it and pin
' distance of the arm ‘I from the pivot 50.
ion ‘II is made dependent upon the position of
At suitable spaced points around the circum
15 ing effect due to the distance of the gear seg-v
ference of the cylindrical casing portion I0, cuts
20 are made in the wall 30 and portions of the wall
are forced inwardly as indicated at Gil, to form
ledges or seats on which the dial plate, may rest.
Three such ledges 60, spaced equally around the
circumference of the casing are usually sufficient.
26 The dial plate 6| is made of a diameter’ slightly
less than the internal diameter of the casing
portionv 30, as shown especially in Fig. 2, except
that at two points, approximately on a diameter
the pin Ill, so that wherever this pin may be
located, whether a little too far or a littletoo
'close to the axial center of the gauge, the shaft ‘
88 will nevertheless always be at exactly the
right distance from the pin 80, and the pinion
‘ll will always mesh to exactly the right’ extent
with the teeth of the gear segment ‘I. Since
the ears or tits '2 on the dial plate are provided
on a diameter substantially perpendicular to the
diameter passing through the pin ll, they do not
prevent slight movement of the dial plate ii in a
50, the dial plate is provided with small points . direction along the diameter passing through
at right angles to that passing through the pin
forming extensions or tits .2. The extreme dis
tance from the end of one of these tits .2 to the
end of the other is very slightly greater than
the internal diameter of the casing portion II,
35 but the tits 62 are of such small size that they
are sufilciently flexibleso that air-the dial plate
II is forced axially into the casing the tits will be
readily bent over from theirinitial ?at condition
indicated in Fig. 3 to the bent condition indi
cated in Figs. 2 and 8, in which they make tight
contact with the inner surface of the casing
' wall 30.
The dial plate ll is provided with a hole, ‘4
of the proper size and in the proper location to
receive the end of the pin 50 as shown in Fig. 4.
° m the center of the dial plate a bushing u in
the form of a hollow rivet extends through the
plate and serves to connect the plate ?rmly to a
U-shaped bracket 61. The needle shaft 8' ex
tends through the bushing or hollow rivet and‘ is
Journaled therein near its forward end, the rear
end of the shaft being iournaled in the bracket
4 81 as readily seen from Fig. 4.
The front end
on the pin II if this pin is not exactly in its
intended position.
vThe dial plate carries, of course, suitable'grad
uations reading in pounds per square inch, or
any other desired units of measurements, the
scale being graduated concentric with the shaft
‘I and, therefore, substantially concentrlcwith
the casing ll. Such graduations are shown dia
grammatically at ‘II in Figs. 1 and 2.
In front of the dial plate II and the needle 80.
is a transparent plate 00, of glass or other suit
able material, the periphery of which may rest
upon the front ‘edge of the casing portion 8..
The glass may be held in place by a bezel having
a cylindrical portion ll ?tting over and sur
rounding the casing portion SI and forming a
tight press ?t therewith if desired, the bezel also
having an annular inwardly extending. portion
overlying the periphery of' the glass II and serv
ing to retain a washer or gasket 0! in place.
Preferably the annular portion of the bezel is
shaped as best shown in Fig. 5. having a convex
‘I'l having one end secured to a hub or collar ridge ll near its outer edge‘, and then a concave
on the shaft 60, and having its other end secured or depressed portion I. inwardly of the portion
at 12 to the bracket 61. This hair spring ‘ll con- ' II, and then another convex portion l'l terminat
stantly tends,_with a very slight force, to rotate ing in an edge It, as shown. The innermost in
clined wall or side of the convex portion l‘l pre
the needle ‘in one direction, thus taking up back
vents the gasket II from squeezing out between
lash between the pinion ‘II and the gear seg
ment I2, and holding the crank 4‘ always against the bezel and the glass in a direction toward the
center of the gauge, while the depressed portion
the stud l5.
It is seen that the needle, the needle shaft. ll produces a ?rm pressure upon an intermediate
the pinion and the hair spring all‘form a single part of the gasket '2, thus pressing this part of
unitary assembly mounted on and carried by the the gasket ?rmly against the glass II. but the
dial plate 6|, this assembly being shown by itself relieved portion I‘! does not press to any great
in Pig. 9. It is easy to mount this assembly in extent upon the gasket, and thus the gasket is
the casing, as it is simply necessary to move the not tightly compressed at a point which is likely
dial plate assembly axially into the casing with to extrude the gasket between the bezel and the
the hole “in the dial plate alined with the pin glass. A second gasket ‘I is preferably placed
60 so that the pin will enter the hole. The ears beneath the glass II, and a sleeve or spacing
or tits 62 bend up or forwardly as the dial plate ring ll holds the gasket II, in place and also
of the shaft 60 -carries the needle or pointer 09.
A pinion ‘I. ?xed to the shaft Cl behind the
bushing 06 meshes with the gear segment 52,
while behind the pinion ‘II is a coiled hair spring
the pin l0, and since the dial plate ‘I is of
slightly smaller diameter than the casing 80, it
may move. somewhat along theldiameter passing
through the pin it ssvmay be required in order
to position the hole .4 of the dial plate properly 35
3. _
maintains the am plate u properly seated against phraam moves back and forth under the in?u
ence of pressure variations the effective diameter
The gallae above described has what may be of that part of the diaphragm which is subject
- the abutments II.
termed a plain cylindrical outer edge. ' Sometimes
to movement will remain constant ‘so long as the
it is desind to-provide gauges of the ?anged type; diaphragm is not subjected to such excessive
.- with outwardly extending annular ?anges on
their-outer edges so that such‘ gauges may be
mounted on an instrument board. The same
improved principles of construction of the beael
may be employed on a ?anged gauge, as shown
in 1"ig. 6. Here, the casing part IIa has an out
wardly extending ?ange IIb. 'lhe dial plate is
indicated at Ila and the glass at Ila. The bezel
pressuresas will cause it to lie?at against the
guard plate. The‘peripheral edge of the dia
phragm III may be, and preferably. is, bentinto
cylindrical-shape to extend forwardly past the
‘periphery of the guard plate III, as indicated at .10
III, and then bent radially inwardly as at III,
thus securely locking together the members III
and III which constitute the diaphragm assem
Ila has its outer edge turned rearwardly around ‘ bly or diaphragm meansf This diaphragm as
15 and embracing the ?ange III: of the gauge cas-‘ sembly’ is placed within the small cylindrical 15
ing, thin holding the bezel immovably'to the eas
chamber formed by the cylindrical wall portion
ing. As before, there is a gasket Ila, and the beael ' "of the casing, andseated against a gasket III
has a depression, IIo overlying an intermediate. which lies against the ?ange II and prevents the
portion of the width of the gasket to press this ‘diaphragm assembly from moving in vone direc-1
20 part of the gasket ?rmly toward the glass Na, :-tion, that is‘. in a direction axially-backwards.‘
and also has a convex portion or bulge Ila near According to the present invention, novel and
its inner edge terminating at the inner edge I841. improved means is provided for holding the dia
The convex portion Ila receives the inner edge > phragm assembly against movement in the op
of the gasket I2a without pressing it so tightly posite direction, that is in a direction axiailyfor
as to cause it to extrude between the bezel and wardly. This improved holding means is formed
the glass. A second gasket Ila and a sleeve or by the method indicated diagrammatically in
spacingvring Ila may be employed as before. I Fig. 13 to which reference is now made.
Another spacing ring II may be placed between
After the diaphragm assembly'has been placed
the bezel Ila and the ?ange III), to prevent the within the cylindrical wall portion 32, a tool III
bezel from buckling when mounting screwswhich is alined concentrically with this cylindrical por
pass through the bezel and ?ange are'drawn ' tion I2. The tool III has,‘v around its entire pe
riphery, a sharp annular cutting edge I II of a
Fig. 7 illustrates a modified form of construc
diameter slightly greater‘ than the external di
tion for mounting the needle shaft and pinion ameter of the diaphragm assembly, or the inter
upon the dial plate. Here, the dial plate is indi
nal ‘diameter of the cylindrical wall portion 32.
cated at III), the needle at Ilb and the needle This tool III may constitute part of a press. The
shaft at IIb. Instead‘ of providing a separate tool is then forced downwardly from the position
U-shaped bracket II to form a bearing for the shown in Fig. 13, so that the sharp cutting edge
' needle shaft the bushing or hollow rivet II itself
40 is made relatively long as indicated at III), to
III thereof cuts into the metal of the wall 82 all
the way'around the periphery of the diaphragm 40
form» a su?lcient bearing for the needle shaft. assembly and cuts, in effect, an annular slice
The pinion 10b, is secured to the shaft just to the from such metal, extending all the way around
rear ofthe member IIb and meshes with the gear ~the'periphery of the diaphragm assembly. The
segment Ilb, which may be identical with the inclination of the lower surface I I2 of the tool
rgearsegment I! previously described. ‘A light causes this annular slice of metal to .be bent
‘coiled spring 'IIb surrounds the hollow rivet IIb inwardly and downwardly upon or onto the pe—
and has one end secured to the pinion ‘III: while riphery of the diaphragm assembly. as indicated
the other end is secured to the dial plate IIb,’ .at III in'Fig. 12. The portion III remains at
the spring thus serving to eliminate backlash in tached to and forms an integral part of the metal
needle driving mechanism.
of the wall portion 32, and ‘constitutes an ex 50
50 theThe
diaphragm means in its preferred embodi
cellent abutment or pressure resisting means for
ment may be constructed as best shown in Figs. holding the diaphragm assembly properly seated
12 and 13. The diaphragm means comprises a in the casing and preventing forward movement
pressure responsive diaphragm III of relatively thereof under the in?uence of pressure on the
thin metal, preferably corrugated concentrically rear side of the diaphragm.‘ The operation of 55
to render it more ?exible, and a relatively sti? cutting down the side walls 32 and bend‘ngthem
and unyielding guard plate ‘III of substantially inwardly over‘ the edge of the diaphragm may be
thicker metal, preferably correspondingly corru
conveniently referred to as va “staking” operation.
gated so that if the diaphragm III is subjected
Frequently the integral ?ange or deformed por
tion III provides- a su?lcient ?uid tight seal
60 to excessive pressure, substantially the entire sur
face of the diaphragm may come into contact .around the periphery of the diaphragm assembly,
with the guard plate III and be supported there
by against rupture due to the excessive‘pressure.
The operating stud 15 above mentioned is se
cured to and projects forwardly from the front
face of the diaphragm III at its center‘, and the
guard plate III is provided with a central open
but usually it is preferred'to employ additional
sealing means.' This is conveniently in the form
of a body II5_‘oi’_- solder, applied in a‘ continuous
annular‘ body around theentire periphery of the
diaphragm assembly, in 'a molten state, and usu—
ally to an extent sufficient to cover completely
ing IIZthrough which the'stud It extends.
the ?ange H3 and extend‘a substantial distance
A gasket III is placed between the diaphragm
III and the guard plate III adjacent their pe
ripheries. This gasket is preferably of, a sub
stantially incompressible material, and one of
axially outwardly along the wall 32 and radially .
inwardly along the guard plate II I, as readily ap
parent from Fig; 12. It is found that solder, thus
applied in a molten or substantially molten con
the principal'purposes of the gasket is to pro- ' ditionjand then allowed to solidify, forms an ex
vide a sharp line of separation between the dia- ~ cellent seal at this point and prevents all possi
75 phragm and the guard plate, so that as the dia-* bility of ?uid leakage past the diaphragm assem
my. It is also to be noted that the solder contacts th'érethrough. In the bore is a pressure ?uetua-_
directly with the portion Ill ofv the diaphragm . tion damping means of any suitable construction;
The ends of the sleeve Ill are extended to form
Ill, and thusdirectly seals the joint between
the diaphragm Ill and thecasing, so thatitdoes relatively thin bendable ?anges Ill.
The sleeve Ill is ‘preferably sealed tightly
within the adapter sleeve Ill, if such a sleeve is
phragm Ill and the periphery of.the guard plate _ employed, or tightly within the portion ll, ii’ an
not leak whether. or not there is a perfect ?uid _
tight joint between the periphery of the dia
. adapter sleeve is not used.
The adapter sleeve
Ill,-when employed, is sealed tightly within the
An alternative form of diaphragm assembly
construction is indicated in Fig. 14, ‘in which the
diaphragm is shown at Illa and the guard plate
casing portion ll so that leakage cannot occur
between these parts. The sleeve “I may have
obtain constant working diameter of the dia
the sleevev Ill. On the-other side of the flange
at Illa. Instead of using a.gasket Ill between a shoulder which lies against one side of an in
the diaphragm and the guard plate in order to _ wardly extending ?ange or rim I ll (Fig. 12) ‘on
phragm, the arrangement here employed- is to
extend the guard plate rearwardly at its periph
ery to form a cylindrical ?ange I25, the inner
- surface of which is substantially truly cylindri
cal for a material distance. The diaphragm Illa
has a similar cylindrical ?ange Ill ?tting within
the ?ange Ill of the guard plate, and may ter—
minate in an annular radial ?ange Il'l spaced
from the rear edge of the ?ange Ill by an inter
posed gasket Ill.
Ill, the metal of the sleeve I“ is deformed out
wardly as at I52, by an operation similar to the
staking operation above mentioned. to clamp the
sleeve IlI ?rmly within the sleeve Ill and to
seal the connection against leakage.
Certain subject matter disclosed but not 20
claimed herein is claimed in our copending pat
ent applications, Serial No. 134,588, filed April 2.
1937, for Gauge damping construction, and Serial
The diaphragm Illa is so . No. 135,758, filed April 8. 1937, for Gauge dia
shaped that it curves away from and leaves the
guard plate Illa at a point on the ?ange Ill
where this ?ange is still truly cylindrical. Thus,
notwithstanding ?exing of the diaphragm, the
effective diameter thereof does not vary, but al
ways remains the same so long as the diaphragm
is not subjected to such excessive pressures that
it is actually made to‘ lie against the guard plate.
A gasket Illa may be employed between the
diaphragm ?ange I21 and the casing portion ll,
and the whole diaphragm assembly may be fas
tened in place by a staking operation, which
forms a ?ange Illa similar to the ?ange Ill
above-mentioned. A sealing body Illa may be
phragm mounting.
While certain embodiments of the invention
have been disclosed, it is to be understood that
the inventive idea may be carried out in a number
of ways. This application is, therefore, not to be
limited to the precise details described, but is in
tended to cover all variations and modi?cations
thereof falling within the spirit of the invention
and the scope of the appended claims.
We claim:
, i. A gauge comprising a hollow casing, a pivot 35
member mounted in said casing, gear segment
means mounted for oscillation on said pivot mem
ber, a dial plate, a gear mounted on said dial
employed, corresponding to the sealing body Ill
plate for meshing with said segment means, and
in the ‘previous embodiment.
means on said dial plate cooperating with said
pivot member to locate said dial plate in pre
determined position relatively to said pivot‘ mem
ber to insure proper meshing of said gear with
In Figure 15 of the vdrawings vthere is shown
another embodiment similar in general to that
indicated in Fig. 14. This embodiment includes
a cylindrical ?ange Illb on the guard'plate Illb,
and the diaphragm Illb has a cylindrical ?ange
Illb fitting within the ?ange Illb. As before.
the separation between the diaphragm and the
guard plate occurs at a point where the ?ange
Illb is cylindrical, so that axial movements of the
diaphragm do not result in changes in the effec
tive working diameter thereof.
As II'Ib the diaphragm is extended radially out
wardly past the rear edge of the guard plate
?ange Illb and then at Illb the diaphragm is
bent forwardly along the outer edge of the guard
plate Illb, to a point where it will contact with
the sealing body I Ilb. The advantage of this con
struction over'that shown in Fig. 14 is that the
sealing body Iilb here contacts directly with the
metal of the diaphragm itself and seals the dia
phragm to the casing, irrespective of any leak
age which might occur between the diaphragm
and the guard plate. In the construction shown
in Fig. 14, however, the sealing means Illa does
not come directly into contact with the dia
phragm Illa, and if the construction were some
what defective, leakage might occur around the
'edge of the diaphragm ‘and into the space be
tween the diaphragm and the guard plate, after
70 which the ?uid could easily escape into the gauge
through the opening ill in the guard plate.
In the preferred construction, an adapter
sleeve Ill (Figs. 4 and 12) is ?xed within the
stem ll of the gauge, and within this sleeve is
75 suitably fixed a second sleeve Ill having a bore
said segment means.
2. A gauge comprising a hollow casing, a pivot
member mounted in said casing, gear segment
means mounted for oscillation on said pivot mem
ber, a dial plate, a gear mounted on said dial plate
for meshing with said segment means, and a
hole in said dial plate for receiving said pivot
member to locate said dial plate in predetermined
position relatively to said pivot member to in
sure proper meshing of said gear with said seg
ment means.
3. A gauge comprising a hollow casing, movable
operating means within said casing, a mounting
plate in said casing, a shaft journalled on said
mounting plate, said shaft having one crank por
tion cooperating with and operated by said oper
ating means and a second crank portion spaced
therefrom, a stud secured to said mounting plate,
gear means mounted for oscillation on said stud,
said gear means having a portion cooperating
with and moved by said second crank portion,
other gear means meshing with and driven by
said first mentioned gear means, and indicating
means connected to and driven by said- other
gear means.
4. A gauge comprising a hollow casing, a
mounting plate within said casing, a stud
mounted on said plate, a generally U-shaped
member pivotally mounted on said stud, said U
shaped member having one arm extended to
form a gear segment portion and having another
arm provided with an ear, means contacting with
said ear to move said U~shaped member, a dial
plate, needle means mounted on said dial plate,
and gear means mounted on said dial plate and
operatively connected to‘ said needle means and
meshing with said gear segment portion to be
moved thereby.
5. A gauge comprising a hollow casing having
an annular wall, operating gear means within
said casing, a stud mounted eccentrically in said
10 casing in de?nite relation to said gear means, a
carrying member mounted within said annular
wall and having a limited range of lateral move
ment relatively thereto, a needle shaft extending
through said member, a needle secured to said
shaft on the outer side of said member, a pinion
secured to said shaft on ‘the inner side of said
member and adapted to mesh with said operating
gear means, means on said carrying member for
aperture, gear segment means mounted in said
casing for oscillation about an axis substantially
removed from said stud, a shaft mounted in said
casing, said shaft including two crank portions at
a substantial angle to each other, one of said 5
crank portions contacting with said stud to be
moved thereby and the other of said crank por
tions contacting with said gear segment means
to move said means, dial means secured to said
casing, a needle movably mounted on said dial 10
means, and a pinion also mounted on said dial
means and operatively connected to said needle
and meshing with said segment means to move
said needle in response to movements of said gear
‘segment means.
9. A gauge comprising a metal casing, a pres
sure responsive diaphragm mounted in said cas
ing, a portion of said casing being deformed into
engaging said stud to position said carrying mem
ber and said pinion in de?nite relation to said
operating gear means in a direction along a diam
eter passing through said stud, and means on said
carrying member for engaging said annular wall
to hold said carrying member in de?nite rela
tion to said casing in a direction transverse to said
overlying relation to said diaphragm to hold said
diaphragm in place within said casing, a pivot 20
30 by said annular wall, said ‘dial plate having a
predetermined position relative to said pivot 30
member in said casing, gear segment means
mounted for oscillation on said pivot member,
means operatively connecting said gear segment
means to said diaphragm to move said gear seg
ment means in accordance with movements of 25
said diaphragm, a dial plate, a gear mounted on
6. A gauge comprising a hollow casing having , said dial plate for meshing with said segment
a substantially circular annular wall, and a dial means, and means in said dial plate cooperating
plate adapted to be placed within and be embraced with said pivot member to locate said dial plate in
periphery the major portion of which is shaped
to be spaced inwardly from said annular wall, and
also having a plurality of relatively small ears for
engaging the inner surface of said annular wall at
spaced points.
7. A gauge comprising a hollow casing having a
substantially circular annular wall, and a dial
plate adapted to be placed within and be embraced
by said annular wall, said dial plate having a pe
40 riphery the major portion of which is shaped to
be spaced inwardly from said annular wall, and
also having a plurality of relatively small ears for
engaging the inner surface of said annular wall
at spaced point, said ears initially extending out
wardly to radial extents greater than the radius
of said annular wall, and being of readily benda
ble material adapted to be bent up to lie within
said annular wall when said dial plate is pressed
forcibly into said casing.
8. A gauge comprising a casing, a pressure re
sponsive diaphragm mounted therein, a guard
plate mounted adjacent said diaphragm to limit
motion thereof in one direction, said guard plate
having a central aperture therein, a stud secured
to said diaphragm and projecting through said
member to insure proper meshing of said gear
with said segment means.
10. A gauge comprising a hollow casing having
a substantially circular annular wall, a pivot
member mounted within said casing, gear seg 35
ment means mounted for oscillation on said pivot
member, a dial plate adapted to be placed within be embraced by said annular wall, a gear
mounted on said dial plate for meshing with said
segment means, said dial plate having a periphery 40
the major portion of which is shaped to be spaced
inwardly from said annular wall and having a
hole in said dial plate for receiving said pivot
member to lock said dial plate in predetermined
position relative to said pivot member to in
sure proper meshing of said gear with said seg
ment means, and a plurality of relatively small
ears on the periphery of said dial plate for engag
ing the inner surface of said annular wall at
spaced points, to hold said dial plate against lat 50
eral shifting with respect to said annular wall
when said dial plate has been properly impaled
on said, pivot member.
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