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Патент USA US2404750

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Jply 23, 1946.
2,404,750
w. D. SCHMIDT
GAUGE
‘
Filed Aug. 28, 1944
36
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wiumm D. schmidlt.
Patented July 23, 1946
UNITED
2,404,750
STATES‘
"2,404,150
PATENT l_ OFFICE
. .
>
‘
‘GAUGE
‘William J). Schmidt, ‘Worcester, Mass.
Application August 28, 1944, 'Seria’l'No. 35511459
-7 Claims.
1
(Cl. 33-447‘)
.
IItis an object of 'th'eipresent invention ‘to ‘pro
vide means 'for ‘measuring "objects having close
tolerances.
It is a :fur'ther object of ‘the present ‘invention
to provide a simple measuring ‘device vthat is self
contained ‘for accurately measuring variations be
tween successive ‘workpieces.
It is a further object of the present invention
to ‘provide a ‘portable [measuring device for sub
stantially unskilled operators ‘to measure "wor' - 110
stem having a cap‘ £66 ‘:fastened on the end. Be
yond ‘the valve seat 54 ‘is a reduced passage *68
which is intercepted by a conduit 1'!) ‘that leads
to 'a pressure regulating ‘valve 72. The ‘pressure
regulating valve can he any (one of several com
"mon types of VEUIVGS that'are "available commer
cially and "need not ‘be described other ‘than ‘to
say :it regulates the pressure of the gas riro'mthe
‘chamber ‘22 to the ‘ori?c'ei'Z?.
‘
7
A conduit 14 connects the regulating valveifliz
pieces to very close ‘tolerances.
Furtherobjects will appear ‘in the detailed ‘de
with a passage 16 one end of which is intercepted
scription in conjunction ‘with ‘the accompanying
with ‘the manometer tube 42 in the transparent ‘
‘drawing, .in which:
Fig. 1 is ,a :side elevation partially ‘in section 15
"block '36.
showing the construction of the device.
Fig. ,2 .‘is a‘ ifront ‘elevation of the :device.
Bis :a plan 'view ‘of the device.
Fig. 4 shows a ‘modi?cation ini‘the device.
Fig. ‘5 shows a modi?cationo'f the device ‘where
in it ‘is entirely self-‘contained.
Referring to Fig. 1 it will be noted that "the
by the ori?ce :28 and ‘the other end "connects
i
The anvil I6 is adjusted relative to the ‘ori?ce
28 to a dimension'suiitabl'e for the passage or "a
workpiece W of the desired size. whenfthe'lworh
piece is in ‘position the operator ‘presses “the "cap
'66 which opens the valve 154 thereby allowing the
compressed gas in the “chamber 22' 'to' flow
through the regulating‘valve 12 ‘to the‘ ori?ce .2‘8
and the manometer tube ‘42 by the way of con
device comprises a ‘body ‘t0 having a lower arm
duit ‘l4 and passage 16.
'
i
it >
‘
l2 from which rises a portion 14. Within the
Variations in successive workpieces are ‘meas
portion l4 a cylindrical member or anvil I6 is 25 ured on the indicia 48 by the amount of movement
slidably mounted, said member having a threaded
of the ?uid 44 in the manometer tube and this
portion l8 which is screw threaded into a threaded
movement is governed by the flow of the gas
hole 26 in the portion I4.
through the ori?ce 28 as restricted by the work
The body l0 also has a chamber 22 and an upper
piece. Whrkpieces that are undersize allowing
arm 24 from which depends a portion 26 in which 30 the gas to escape comparatively freely with a
there is an ori?ce 2B. Extending upward from
small amount of movement of the fluid 44 while a
the arm 24 is a portion 30 which provides a
workpiece that is up to size will restrict the ?ow
bearing surface 32. A bearing surface 34 is also
of gas with the consequent large movement of the
?nished on the upper arm 24.
?uid 44.
A transparent member 36, mounted on the 35 Fig. 4 shows a dial indicator gauge 18 which
surfaces 32 and 34, is fastened in place by means
may be used instead of a manometer for regis
of screws 38 and 40. This transparent member
tering variations in the escape of gas due to the
can be made of a moldable plastic material in
restriction of the ori?ce 28 by the work W.
which is cast a curved tube 42 in which is a
This invention is applicable to both external
?uid 44 thereby forming a manometer; the in 40 and internal gauging and has so been consid
dicia 46 for indicating the variations in the height
of the ?uid being marked on the surface of the
member 36.
A valve 48 is screw threaded into the body [0
to provide means by which compressed gas (for
example, air) may be introduced into the cham
ber 22 from any available source. The body In
is provided with intersecting passages 50 and 52,
ered.
v
.
From the above description it will be seen that
I have provided a self-contained measuring de
vice which is simple in construction, easy to
operate and readily moved from place to place
as required.
Fig. 5 is a modi?cation in the construction of
the device shown in Fig. 1, wherein air is com
the latter passage providing a valve seat 54 for a
valve 55. A spring 58 maintains the valve 55 50 pressed by means of a hand operated air pump
80 which is operated manually by means of a
against the seat 54 and a screw plug 60 has the
dual duty of providing the proper spring pressure
handle 82. The construction of the air pump is
and closing the passage 52.
old and well known in the art and as the said
The Valve 56 has a stem 62 which extends
construction forms no part of this invention, the
through a bearing passage 64 in the body l0, said 65 pump need not be further described other than
2,404,750
3
4
to say that it introduces and compresses air in
the chamber 22.
With this construction I have provided a simple
gauge device having extreme accuracy that can be
used anywhere without the necessity of being near
a source of supply of compressed gas in order’
to re?ll the chamber 22.
Having thus fully described my invention, what
‘I claim, new and desire to secure by Letters Pat
manometer and means for introducing and com
pressing gas in said chamber.
' 4. A device for measuring workpieces compris
ing. a unitary body member having a chamber
formed therein for compressed gas, an ori?ce,
an adjustable work support, a regulating valve be
tween said chamber and said ori?ce, and a man
ually actuated valve connecting said chamber to
said- regulating valve.
10
5. A device for measuring workpiece compris
ent, is: v
1. A device for measuring a workpiece com
ing a unitary body member having a chamber
prising a body member having means to support
formed therein for compressed gas, an ori?ce,
a workpiece, a chamber for compressed gas formed
a work support, a manometer, a regulating valve
in said body member, an ori?ce connected to said ‘ ' ‘
between said chamber and said ori?ce and
chamber, means to indicate variations in the 15. manometer, manually actuated valve means to
pressure of said gas flowing through said ori?ce,
allow the gas in the chamber to flow to said regu
and means operable to introduce gas vin said~ '
lating valve, and manually operable means to
chamber to said ori?ce and said indicating means.
introduce and compress gas in said chambers.
2. A device for measuring a workpiece com
6. A device for measuring a workpiece compris
prising a body member having means to support 20 ing a body member having means to support a
a workpiece,‘ a chamber formed in said body mem
workpiece, a chamber formed in said body ‘for
ber for compressed gas, an ori?ce spaced from the
compressed gas, an ori?ce ' connected to said.
work' supporting means and connected to ‘said
chamber, means to indicate variations in the pres‘
chamber, means to indicate variations in the pres
sure of said gas ?owing through said ori?ce, valve
sure of gas ?owing through said orifice as re 25 means operable to allow the gas in said chamber
stricted by a workpiece placed between the
to ?ow to said ori?ce and said indicating means,
work-‘supporting means and-the ori?ce, a valve
and manually operable means to introduce. and
operable to- introduce gas from said chamber to
compress gas in said chamber.
' V
' '
the ori?ce and indicating means and means for
'7. A device for measuring workpiece compris
introducing and compressing gas in said cham
ber.
-
‘7
3. A device for measuring a workpiece compris
ing a- body member having adjustable means‘to
support a workpiece, a chamber formed in said
bodymember for compressed gas, an ori?ce spaced
from the work‘supporting means and connected
to said chamber, a transparent indicator hawlng a
manometer cast therein connected-to said cham
ber; fluid'in said manometer, indicia on said indi
“ cator, and a manually actuated valve to allow gas
'to flow from‘ said chamber to said ori?ce and
manometer whereby variations in the escape of
gas from‘ said ori?ce is indicated by the indicia
duewto the displacement'of the ?uid in the
V30
ing a unitary body member having‘a chamber
formed therein for compressed gas, an adjustable
. work support,,manually operable means to intro
duce and compress gas in said chamber, an~ ori?ce
opposite the work supporting-means connected to
said chamber, means to indicate variations in the
pressure of- said gas ?owing‘through saidori?ce,
valve means manually operable to allow ithe‘gas in
said chamber to ?ow to said ori?ce and indicat
ing means, and a regulating valve to regulate the
40 quantity of compressed gas ?owing to said ori?ce
and indicating means when said. valve means is
actuated.
’
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'
WILLIAM D.
'
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"
SCHMIDT. 2
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