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Патент USA US2412127

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Dec-.3, 1946.
'
E. A. COOKE
l
'2,412,127
LINEAR DIMENS ION GAUGE
- ERNEST HLa's/zf Coal-f
A Homey
Dec'. 3, 1946.l
2,412,127
E; A. COOKE
LINEAR DIMENSION GAUGE
` Filed July 5, 1944
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Dec. 3, 1946.
E. A. COOKE
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2,412,127
LINEAR DIMENSION GAUGE
Filed July 5, 1944
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Inventor"
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_ Dec. 3, 1946.
' E, A. COOKE "
2,412,127 »
LINEAR- DIMENSION GAUGE
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2,412,127
Patented Dec. 3, 1946
Y UNITED STATES PATENT GFIFICE
LINEAR DIMENSION GAUGE
Ernest Albert Cooke, Leicester, England, assignor
to Taylor, Taylor & Hobson Limited, Leicester,
England, a company of Great Britain
Application July 5, 1944, Serial No. 543,536
In Great Britain July 14, 1943
18 Claims.
(Cl. 33-1-147)
l
2
This invention relates to linear dimension
gauges of the kind comprising a gauge body hav
ing a feeler member or linger whose movement
relatively to the gauge body causes relative move
ment of two elements which control an indicating
ried on the top of a supporting table or pedestal,
part of which is shown at C in Figures 2 and 3.
Mounted to turn in the gauge body A, and eX
and/or recording instrument in accordance with
the said relative movement of the two control ele
ments.
An object of the invention is to provide an im
proved construction of such gauge whereby meas
urements can be elîected at will on one side or the
other oi a central point or Zero without modifica
tion of the gauge itself or of its mounting.
To this end, in a linear dimension gauge accord
ing to the invention the feeler member actuates
the two control elements through two rocking
tending transversely to the length of the guides
Bl on the base B, is a locking spindle A1 hav
ing an eccentric portion A2 which engages two
tension studs A3 acting on jibs A4 which bear
against the under surface of the guides B1 as
clearly shown in Figure 2. The gauge body A
10 can thus be locked to the guides B1 in any posi
tion of adjustment along such guides. In order
to prevent disturbance of this adjustment due to
shake while the jibs A4 are out of engagement
with the guides B1, a supplementary jib A5 is
provided which is spring-pressed against the
guides B1, Extending throughout the length of
levers respectively, the arrangement being such
the guides Bl and slideable in opposite ends there
that when the feeler member moves in one direc
tion or the other to turn either lever about its
of is a draw-bar D which passes freely through
the gauge body A and is furnished at o-ne end with
ure 1,
Figure 4 is'a section on the line IV-IV of Fig
ure l,
ends E1, E2 which constitute feeler points, project
fulcrum, thus causing movement of the associated 20 a screwthreaded portion D1 (Figure 6) engaged
by anA internally screwthreaded nipple D2 to which
control element, simultaneous movement of the
is secured a knurled ring D3. Thus, rotation of
second control element is prevented by an abut
the ring D3 causes the nipple D2 to turn about the
ment.
axis of the bar D and, at the same time, to act
Further objects of the invention will be appar
y axially through a thrust bearing D4 on the base
ent from the following description of the accom
B. ThedraW-bar D is thus axially adjusted, that
panying drawings and from the appended claims.
is t'o say parallel to the guides B1. The gauge
The gauge may be used vertically or horizontally
body. carries a second locking spindle A5 which
but in the example shown in the drawings the
is axially movable in the gauge body A and has
gauge is adapted for horizontal use.
30 an abutment A'I formed thereon for engaging the
In the drawings,
'
~
draw-bar D, as shown in Figure 4, so that the
'Figure l shows the gauge in plan, part only of
gauge body A can be locked to the bar D in any
the supporting base being shown whilst a portion
position of adjustment along the bar.
of the gauge body is illustrated in section,
Extending through the gauge body A and lon
Figure 2 is a section on the line I‘I-II of Fig
gitudinally movable therein in the direction of
ure 1J
the length of the guides Bland draw-baroD, is
Figure 3 is a section on the line III-III of Fig
Figure 5 illustrates the base in end elevation,
Figure A6 is a section on the line VI-VI of Fig
ure 5,
'
l
Figure ’7 shows the adjustable gauge block or
anvil as viewed from right to left of Figure 1 and
Figure 8 is a diagrammatic representation of
a feeler member Econstituted by a rod whose two
from opposite sides of the gauge body A respec
40 tively, the longitudinal movement of the feeler
rod E relatively to the gauge body A being lim~
itedbya transverse pin E3 carried lbythe gauge
body and extending through a slot E4 in the
feeler rod E. ` The rod E has, longitudinally
spaced apart thereon, two abutments E5, E5 in
the form of radial ñanges, the ñange E5 being in
screwthreaded engagement with the rod E so that
magnetic control device.
'
'
the axialspacing of the abutments E5, E5 can be
Figure 9 shows a lathe, in side elevation, with
initially adjusted and firmly secured in the po
a- gauge according to the invention mounted
50 sition of adjustment by a locking ring E". The
thereon, and
'
two abutments E5, E6 cooperate respectively with
Figure 10 is a front elevation of a milling ma
the adjacent ends of two rocking levers F, F1 each
chine having the gauge arranged adjacent to the
of which is connected to the gauge body A by a
table.
springligament F2, the ends of the levers which
In the construction shown, the gauge body A
cooperate with the abutments E5, E5 being round
is mounted to slide along a horizontal base B car
the control circuit associated with the electro
anche?
3
4
ed so as to make substantially point-sliding con
tact at the points of engagement as shown in
about their fulcrums and bear, at their opposite
ends, against the abutments E5, E5 and against
the associated fixed abutment studs F3, the indici
ating instrument I then reading zero.v
Figure 1.
Arranged Within a casing A8 constituting part
The gauge may be used in Vvarious ways to suit `
of the gauge body A is an electromagnetic con
requirements.
trol device for actuating an indicating instru
ment I arranged, say, on the table C, or at some
other convenient point, ’and connected to the'con
trol device through flexible leads 'extending
ofthe locking spindle A2, and the abutment block
is coarsely adjusted along the associated guide
B1 until the stop spindle H2 bears against the
through the casing A8 as indicated by the nipple ~
4adjacent `end E1 or E2 of the rod E, according to
which side of the gauge body A the abutment
A9. >îlî‘he electromagnetic control device iswinljthe
form of a cylindrical unit comprising a tubular
outer casing G longitudinally s_lidabl'ei withina "
supporting cradle G1 vand Ycarrying therein two'
balanced coils G2, G3 (Figure 8). The cradle G1
is supported from the gauge body vA by two par
allel spring ligaments G“1 so that whils't‘the con
trol device is free, within limits to move rela..
tively to the gauge body A the cradle G1 will
always remainwith its longitudinal axis parallel
to _the lleríg'th'oiî thefe'eler rod E. AOne end of the
tubular casing 'G has anl end cap G5 provided with
'a central conical recess (Figure 3) which con
According .to one method, the ~
gauge' body A is locked tothe base B by means
blockf-iïs `arranged "as may prove the more con
venient. Having locked the block H in position
by means of the stud H1, the stop »spindle H2 is
>adjusted by_,means of the micrometer head H3
, until vthe `indicating instrument I reads Zero. By
inserting the workl W to be measured between
the spindle H2 and the cooperating end of the
20 Íeeler rod E, as indicated in Figure 1, the dimen- ~
sionof the 'work will be 'accurately indicated lon
the indicating instrument I sincefthe movement
of the armature G'I relatively tothe coils G2, G'3
will _"ca‘use a corresponding alteration in the re
stitutes 'a> seating `for one end vof a ball-ended
tappet rod GG, the ball at the other end of> this
tappet engaginga similar‘conical recess in vthe
adjacent end of vthe lever F1. In alignment With
the’conical recess in the lever F1, but on that side
thereof- remote from the recess, is a iixed abut
luctance of the Vtvfoma'g’netic circuits formed lby
the cores ofthe coils.
It will be seen that as one of the levers (say, the
lever F) turns about its fulcrum to cause adjust;
ment of the associated element of the control de
ment in the 'form of a round headed stud F3 in 30 vice (say'the armature’Gl) simultaneousangular
screwt-hre'aded’engagement with the casing A3 so
movement of the other 'lever (F1) in vthe same
that the stud F3 can be adjusted as required, and
sense is prevented byv the `:associated abutment
locked in theposition of adjustment by the as
sociated lock nut F4. At the other end' of the
control device an armature G7, cooperating with
the >coils G2, G3, is similarly connected through a
tappet rod G6 to the lever F which is also pro
stud F3 so that this 'second lever'a’cts as an‘abut'
ment». If however, the blockV H were 'used on
the other'sîde of the gauge body, the second lever
'would be turned about its fulcrur'n whilst the ñr'st
lever _would `act as a fixed abutment. Further,
though 'by reason of the Vñnite lengths ofthe lever
F, F1 the‘path of movement ‘of the point of ap
vided with an'abutment stud F3.
y '_The electromagnetic control device is energised
from a transformer T whose primary T1 is sup
- plication of each lever with the feeler rod `E and
the associated control element will be arcuate,
'that is to'sa'y out of parallelism with the longi-r
tudinal movement of the feeler rod E, the ‘rela
plied with power yfromr a suitable a, c. source
whilst the coil‘s'G2, G3 are- arranged in the sec
ondarycircuit T2, ‘the instrument I being con
'tivesadjustment' of the control elements (i. e. "the
nected tfrom‘the mid-point between the coils G2,
Gîtoa tapping on a resistance R.
Íarmature V>and thecoils) will be ltruly parallel to
A
_Though the feeler rod E may cooperate at, one
»the movement of the feeler rod since the cone
ltrol device, being supported by the parallel spring
orfeacl'i -end ‘withan anvil ñxed relatively to the
ligaments
will always vremain* parallel to the
length of the feeler rod E; The rollingengage
ment between the control elements'a'nd the 'tap-`
petrods G5 as Valso'between the abutments E5, E6
vand the 4associated‘ends of the levers F, F1, al
gui'debase '_B, the 4wo’rlrto‘be measured being are'
-ranged'between the anvil and the associated end
of thel feeler rod E, it is preferred to provi'de‘an
abutment block adjustable along the base B, or
along a'guide arranged `on ‘the table C a‘ndfpar`~
vallel yto the 'guides B1. To ’this end, in the'con‘
struction >shown in the drawings an Vabutment
block 'H vfurnished' with lguide surfacesjfor ven
gaging ‘one of r'the 'guides B1,>as shown in Figure
7, >has a locking stud H1 by which the block H‘can
be locked to the' associated guide B1v in ‘any 'de
Ísire‘d position or"V adjustment along this guide.
YThe vblock H also' carries 'a'stop spindleH2‘which
low k1for the ‘slight "transverse displacement of
'the control device 'relatively‘to the rod.E.r.By mounting the levers F, F1 on the spring
ligaments F2, and providing a similar support 'for
the control elements (as a »single unit), Whilst v
'maintaining point-sliding contactsbetween `each
. of the levers F, F1 and the parts engaged thereby,
Si O
is longitudinally adjustable relatively to the block
thus substantially eliminated.
H by` means of 'a micrometer head H3. A pinfH4
As willzbe readily appreciated, instead of` or
in addition to the line adjustment effected'by'the
` carried by ’the jblock H, vand engaging‘av longi.V
tudinal 'slot H5 in‘the ystop spindle‘H2, serves to `
limit the range of' adjustment of this spindle
'relatively to the block H. When the block H is in
friction between >moving `'parts is reduced 'to a
minimum and inaccuracies 'due to ‘friction are
5 stop »spindle H2, Zeroing "of 'the Ygauge .prior Yto
making a measurement may be éiîecte'd by re
leasing the tension on the‘studs A2 andtlocking
position on the base B, on one >side or the "other
of the gauge body A, the spindle Hzlies in align
the gauge body to the draw bar D by operating ' ì
thefspindle A3, 'the draw bar D'b‘ein‘g >then ad->
70 justed bythe knurled ring D3 so as 'to 'effectfñne
-'adjustment _of -the gauge body A relativelyïto the
Basie Ór'iniuai sei-.ting of tnelgaugeis effected
¿ment with the corresponding'end
or E2 of the
'abutment block-H Vìiihe'reupon the 'spindle A2 iis
operated to relock the gauge `,body A to the
'by adjïïstíîlg ythe''síoät'r‘zîrig b'etWè-èh >the fèelé'rv?òd
'abutments E5, E‘î’soth'at, with _the rod4 E in its
y'cl'entral ‘ position H 'of klongitudinal ` adjustmentl the
levers F, F1 lie in their ïnorrnal‘or zero'positions
‘baselì >
5
"
Y
By‘providing an abutment block, such as the
2,412,127
6
5
the operation of turning between shoulders. Ac~
block H, on both sides of the gauge body A simul
cording to another use, the gauge may be sup
taneously, the gauge may be employed for pur
ported by a bracket on the knee of a milling
poses of comparing work with an accurately iin
ished sample. To this end the sample is posi
What I claim as my invention and declare to
tioned between one> abutment block and the adja Ul
secure by Letters Patent is:
cent end of the feeler rod, this .block locked to
l. A linear dimension gauge comprising a
the guides B1 and the stop spindle H2 thereof
gauge body, a feeler rod carried by the gauge
(and/or the draw-bar D) adjusted until the in
body and longitudinally movable relatively there
dicating instrument I reads zero, whereupon the
to, two transverse abutments longitudinally
gauge body A is locked to the guides B1. The
spaced apart on the feeler rod, two relatively
second abutment block is now adjusted until the
movable control elements carried by the gauge
stop spindle H2 thereof bears firmly against the
body, means whereby an indicating instrument
adjacent end oi the feeler rod E, the second abut- 1
is actuated in accordance with relative movement
ment block being then firmly locked to the guide
of the control elements, two rocking levers car
B1. If this results in the reading on the instru
ried by the gauge body and through which move
ment I altering from zero, which may occur due
ment is transmitted from the transverse abut
to the feeler rod E not making a iirm contact
ments on the feeler rod to the two control ele
with the sample, the gauge body A is released
ments respectively, and two abutments associ
from the guides B1 and locked to the draw bar D
which is then adjusted, by the ring D3, until 20 ated respectively with the levers and each com
prising a stop which permits movement of the
the instrument I reads zero. The gauge body
associated lever in one direction only, from a
A is then locked to the guides B1 and the sample
normal static position, the directions of permis
is removed for substitution of the work W to
sible angular movements of the two levers being
be compared therewith, the second abutment
`
,
block being preferably adjusted away from the 25 relatively reversed.
2. A linear dimension gauge comprising a gauge
gauge body A. Since this arrangement will only
body, a ieeler member carried by the gauge body
indicate divergencies which are in excess ci the
and movable relatively thereto, two relatively
dimension of the sample, the second abutment
movable control elements carried by the gauge
block may incorporate a spring between the stop
spindle and the body of the abutment block and 30 body, means whereby an indicating instrument
is actuated in accordance with relative movement
this block left in position with the spring under
of the control elements, two rocking levers sup
slight compression.
ported from the gauge body by spring ligaments
In Figure 9 the gauge A is mounted on the
and through which movement is transmitted
cross-slide J1 of a lathe J, cooperating bars K, K1
from the ieeler member to the two control ele
being arranged in brackets K2, K3 carried by the
Vments respectively, and two abutments associ
lathe bed J2. The bars K, K1 are longitudinally
ated respectively with the levers and each com
adjustable in the brackets and can be locked
machine.
.
,
thereto by studs K4, the brackets K2, K3 being
individually adjustable along the lathe bed J2.
prising a stop which permits movement ofthe
In Figure 10 the gauge A is mounted on a
normal` static position, the directions of per
missible angular movements of the two levers
associated lever in one direction only, from a
bracket L1 carried by the cross-slide L2 of a mill
being relatively reversed.
ing machine L. A slip gauge carrier M, is adjust
3. A linear dimension gauge comprising a
able along the table L3 relatively to the abut
gauge body, a feeler rod carried by the gauge
ments L4 which are individually adjustable along
45 body and longitudinally lmovable relatively there
the table.
to, two transverse abutments longitudinally
It will be understood that the construction
spaced apart on the feeler rod, two relatively
more specifically described above is' given by way
movable control elements carried by the gauge
of example only and that details of. construction
body, means whereby an indicating instrument
and method of use will vary to suit requirements.
For example, though reverse operation of the 50 is actuated in accordance with relative move
ment of the control elements, two rocking levers
gauge is most conveniently effected by actuation
each supported from the gauge body by a spring
of the feeler member from opposite ends respec
ligament and through which levers movement is
tively when the gauge is employed horizontally,
transmitted from the transverse abutments on
measurements in opposite directions may be ef
fected vertically by biassing the'feeler member in 55 the feeler rod to the two control elements re
spectively, and two abutments associated respec
the downward direction b-y a spring,_so that, for
tively with the two levers, movement of the feeler
example, the thickness of a work-piece may be
rod in one direction or Lthe other causing one
measured against the action oi the biassing spring
lever to turn about its fulcrum thus causing
whilst the depth `of a depression or aperture in
the work-piece may be measured under the action 60 movement of the associated control element
whilst simultaneous movement of the other con
of the spring. Moreover, instead of one rock
trol element is prevented by- the associated
ing lever acting, in eiîect, as a fixed abutment
for the associated control element while the
other control element is being operated, each
control element may cooperate with an asso
ciated abutment through a suitable thrust mem
ber relatively to which the corresponding rocking
lever can move to actuate the associated control l
member in the direction away from the abut
ment.
The gauge according to the invention is more
particularly suitable for use in connection with
machine tools. For example, the gauge body may
be vcarried on the apron of a lathe and utilized
abutment.
'
.
,
>
4. A linear dimension gauge comprising a
gauge body, a feeler member carried by the gauge
body and movable relatively thereto, two rela
tively movable control elements supported, as a
unit, _from the gauge body by parallel spring liga
ments, means whereby an indicating instrument
70 is actuated in accordance with relative movement
of the control elements, two rocking levers car
ried by the gauge body and through which move
ment is transmitted from the feeler member to
the two control elements respectively, two abut- '
for accurate measurement and checking during` 75 ments associated with the two levers respectively
’2,412,127
‘8
7
and each comprising-a stop which permits angu
bys'pring ligaments transverse to the leversthrough which movement is transmittedfrom the
lar-movement 'of the lever in one direction only,
`from a normal static position, the directions 'of
abutments »on the feeler rod tothe >coil element `
permissible angular movements of the two Vlevers
being relatively reversed, movement of the feeler
and armature element respectively, abutments
yassociated with the Atwo levers and each compris
ing 'a stop'which .permits angular movement of
member in one direction or the other causing one
vlever` to turn about its fulcrum thus causing
the Ylever in one direction only,'from anormal
static position, the directions of permissable an
movement of the associated control element
whilst simultaneous movement of the other con
;gular movements of :the two levers being `rela
trol element is prevented by the corresponding 10 tively reversed,'and point-sliding connections be
abutment.
tween the levers and the feeler element, coil-ele
Vv5. A linear dimension 'gauge comprising a
ment, armature element and abutments. ~
gauge body, a feeler member carried by the gauge
9. A linear dimension gauge comprising asup~ 'body and movable relatively thereto, two rela
por-t or base, a 'gauge body adjustable along said
tively movable control elementssupported from
base, a spindle'car-ried by the base, means for ad
the gauge body, as a unit, by parallel spring liga
justing the spindle longitudinally, a device for
locking the gauge body to the spindle in any de
ments transverse to the direction of movement
of the feeler member and tothe direction of rela
sired position of adjustment thereon, a feeler
tive movement of the control elements, means
member carried by the gauge body and -movable
whereby an indicating instrument is actuated in 20 relatively thereto, two relatively movable control
accordance with relative movement of the control
Aelemen-ts carried by the gauge body,'means Where
elements, two rocking levers supported from the
by an indicating instrument is' actuated in ac
gauge body by spring ligaments and through
cordance with relative movement of the control
which movement is transmitted fromthe feeler
elements, two rocking levers carried by îthe >gauge
member to the two control elements respectively, -25 body and through which movement is transmitabutments associated with said levers and each
.ted from the `feeler member to the two control
`comprising a stop which permits angular move
elements respectively, and -two 'abutments asso
ment of the lever in one direction only, from a
ciated with the control elements respectively and
normal static position, the directions of permis
each .comprising a 'stop which permits angular
sible angular movements of the two levers being 30 movement of the lever in one direction only, from
relatively reversed, and point-sliding connections
a normal static position, the directions of per
through which the actuating force is transmitted
missible angular movements of the -two levers be
to each control element and to each lever.
ing relatively reversed, movement of- the feeler
6. A linear dimension gauge comprising a
member inonedirection or the other causing one
-gauge body, a feeler member carried by the gauge ' f~ lever to turn about its fulcrum' thus `causing move
body and movable relatively thereto, an electro
ment of the , associated control element whilst
magnetic device carried by the gauge body and
simultaneous movement of the other control ele
ment is prevented by the associated abutment.
element and an armature element which are
10. A linear dimension .gauge as claimed in
movable relatively to each other, means whereby 40 in claim k8, >in which the gauge body is adjusted
an indicating instrument is actuated in accord
along the guide on the base yby a 'spindle carried
ance with relative movement of the two control
by the base, and means are provided `for locking
elements, two rocking levers carried by the gauge
the gauge body tothe spindle in any desiredposi
body and through which movement is transmit
tion of adjustment -of the gauge body along said
guide.
ted from the feeler member to the two control
elements respectively, and abutments associated
'11. A linear dimension gauge as `claimed in
>with the two levers respectively, movement of
claim 8, in which the gauge body is adjustable
, the feeler member in one direction or the other
Lalong a guide on the base by a spindle ,carried by
»causing 'one lever ‘to turn about its fulcrum» thus
the base, means being provided for lockingr .the
causing movement of the associated 'control-ele'l
vgauge body to the spindle in any desired position
ment whilst simultaneous movementof the other
of adjustment thereon, and the feeler member ls
control element’ is prevented by the associated
eng-aged by an ‘abutment member carried by and
adjustable on the base relatively to the `gauge
comprising two control elements, namely a coil
abutment.
.
'
Y 7..’A linear vdimension gauge as claimed in
body.
claim 5, in 'which the two relatively movable con» i
trol Yelements >are `constituted respectively `by the
coil element and the armature element of >an
12. A linear dimension gauge asïclaimed >in
claim 9, in which'the feeler member :is engaged by
a Stop supported by an abutment block carried
by and adjustable on the base relatively tothe
gauge body, the stop being adjustable on -the
electromagnetic `device for controlling the indi
cating .instrumen-t.
,
8. Alinear dimension -gauge comprising a ysup
port or base, a ‘gui-de carried by said base', ‘af‘g'auge
k
60 abutment block.
body adjustable along lsaid guide,'means'for lock
ing the gauge body to the guide in any desired
position kof vadjustment along the guide, a .feeler
rod carried œby the gauge'body 'and movable 4~rela~ . .
tively thereto in a direction parallel to lsaid guide,
two transverse abut-ments longitudinallyv spaced
' apart on the lfeeler rod, an electromagnetic’ de
f
i3. A linear dimension gauge as claimed in
claim 8, in which the gauge'body is adjustable
along a guide on the base, by a spindle carried
bythe base, ymeans being provided for locking the
vgauge body to the spindle in any desired position
of- adjustment thereon, and the feeler member is
-engagedby an adjustable stop on a gauge block
vice for controlling an >indicating instrument and
carried by and'adjustable onV the base relatively
supported from the gauge body -by parallel spring. 70
ligaments transverse to the feeler'rod, -two -con
to the gauge body.
.
.
14. A linear dimension gauge fas claimedv in
trol elements, namely a -coil »element and ran
claim 9, in which-the Vfeeler member projects; at
‘armature element, constituting part of said con
Veach of its .two ends from the gaugek body, and an K
' »tro1 device -and movable‘relatively 'to-eachother,
-‘abutment member is 'carried «by and adjustable 4on
the base relatively «to the gauge body on either
‘two rocking‘lever's vsupported 'from the Ígauge body
2,412,127
9
10
side thereof so as to engage one end or the other
rod according to whether said block is disposed
of the :feeler member.
on one side or the other of the gauge body.
17. A linear dimension gauge comprising a
gauge body, a feeler member carried by the gauge
15. A linear dimension gauge as claimed in
claim 8, in which the gauge body is adjustable
along a guide on the base by a spindle carried by
the base, means being provided for locking the
gauge body to the spindle in any desired position
of adjustment thereon, and the feeler rod projects
at each of its two ends from the gauge body, and
an abutment member being carried by and ad
body and translationally movable relatively there
to, two rocking levers carried by the gauge body
and extending transversely to the direction of
movement of the feeler member, two abutments
on the feeler member which engage the two end
portions of the levers lying more adjacent to the
feeler member, two control elements carried by
justable on the base so as to engage one end or
the gauge body, said'lelements being relatively
the other of the feeler member.
movable in directions parallel to the movement
16. A linear dimension gauge comprising a
of the feeler member, operative connecting means
supporting base or table, guides carried by said
table, a gauge body carried by and adjustable 15 between the two control elements respectively
and the two end portions of the levers lying more
along said guides, means for locking the gauge
remote from the ieeler member, two stops carried
body to the guides in any desired position of ade
by the gauge block in alignment with the two
justrnent along the guides, a feeler rod carried by
end portions respectively of the levers lying more
the gauge body and longitudinally movable rela
tively thereto in a direction parallel to the guides, 20 remote from the feeler member, and means
whereby an indicating instrument is actuated in
two transverse abutments longitudinally spaced
accordance with the said relative movements of
apart on the íeeler rod, one of which abutments
is longitudinally adjustable on the feeler rod,
the control elements, movement of the feeler
member in one direction or the other causing one .
means for locking said adjustable abutment in
position on the feeler rod at the desired spacing
lever to> turn about its fulcrum thus- causing
of said transverse abutments, an electromagnetic
movement of the associated control element whilst
device for controlling an indicating instrument
simultaneous movement of the other control ele
and supported from the gauge body by parallel
ment is prevented by the corresponding lever
spring ligaments transverse to the length of the
bearing against its associated stop.
feeler rod, two balanced coils constituting one 30
18. A linear dimension gauge comprising a
element of the said control device, an armature
gauge body, a feeler member carried by the gauge
constituting the second element of the control
body and translationally movable relatively
device and coaxial with the first element these
thereto, two rocking levers carried on the gauge
elements being movable relatively t0 each other
body by parallel spring ligaments and extending
thereby causing variation in the reluctance of
transversely to the direction of translational
the magnetic circuits of the coils and actuating
movement of the feeler member, two abutments
the instrument accordingly, two rocking levers
on the feeler member which engage the two end
supported from the gauge body by spring lig~
portions of the lever lying more adjacent to the
aments transverse to the levers through which
feeler member, two control elements, a cradle
movement is transmitted from the transverse 40 supporting the two control elements as a unit,
abutments on the feeler rod to the coil element
parallel spring ligaments connecting said cradle
and armature element respectively two adjust
to the gauge body, the cradle and control ele
able abutment studs carried by the gauge body
ments being thus movable as a unit in directions
and associated with the two rocking levers re
generally parallel to the direction of movement
spectively in alignment with the axis- of the two
of the feeler member whilst the control elements
control elements, each abutment stud permitting
are movable relatively to each other and to the
angular movement of the associated lever in one
cradle in said directions, operative connecting
direction only, from a normal static position, the
means between the two control elements respec
directions of permissible angular movement of
tively and the two end portions of the levers lying
the two levers being relatively reversed, point 50 more remote from the feeler member, two stops
sliding connections between the levers and the
carried by the gauge body in alignment with the
control elements, abutment studs and transverse
two end portions respectively of the levers lying
abutments on the feeler rod, a spindle carried by
more remote from the feeler member, and means
the supporting base parallel to the guides there~
whereby an indicating instrument is actuated in
on, means for adjusting said spindle longitudi
accordance with the said relative movements of
nally relatively t0 the supporting base, a device
the control elements, movement of the feeler
for locking the gauge body to said spindle at
member in one direction or the other causing
will, an abutment block carried by one of the
one lever to turn about its fulcrum thus causing
guides on the supporting base and adjustable
movement of the associated control element
along said guide, means for locking the abutment
whilst simultaneous movement of the other con
block to said guide in any desired position on
trol element is prevented by the corresponding
either side of the gauge body and an adjustable g
stop carried by the abutment block and lying in
alignment with one end or the other of the feeler
lever bearing against its associated stop.
ERNEST ALBERT COOKE.
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