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Патент USA US2411292

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Nov. 19, .1946.
Filed April 21, 1945
2 Sheets-Sheet l
4/2/10? @A/J/J/
62m, (3W2, @2229, am.
Nov. 19, 1946.
Filed April 21, 1945
2 Sheets-Sheet 2
F/& .6'.
4/2/30 RAP/J1
Paten'ted Nov. 19, ‘1946'
Anton Rappl, Eggertsville, N. Y., assignor to Trico
Products Corporation, Buffalo, N. Y.
Application April 21, 1943, Serial No. 483,878
7 Claims.
This invention relates to a gauge or instrument
for determining the dimension of objects, and
primarily functions in the capacity of a com
parator for testing or comparing the bores or
recesses in workpieces with their counterparts
in a master piece.
Internal callipers usually comprise an adjust‘
ment which is slow and unsuitable for mass pro
(Cl. 33-178)
spring 13 which, when free, moves the table to
its uppermost position. To determine this posi
tion a stop It is provided on a tablecarried rod
l5 which is slidable through an abutment Hi.
The depression of the table is limited by a stop
I‘! on the rod above the abutment. Both stops
are adjustably secured by set screws It to vary
the uppermost position, and the. extent of free
of the table, and each stop is provided
The object of the present invention is to pro 10 With a spring
cushioning disk l9 free on the rod.
vide an e?icient comparator of this type which
The table may be ?xed by a set screw 2d engaged
is practical and suitable for handling 1 large
with the shaft l2.
quantities of workpieces in an expeditious though
The table is provided With a slot 2! through‘
accurate manner.
which extend the upwardly directed calliper
The invention further has for its object to pro
?ngers 22 and 23. One ?nger 22 is removably
vide an internal gauging instrument of this char
secured by a nut 24 to a gauging carriage 25
acter in which the work engaging calliper por
while the companion ?nger 23 is adjustably ?xed
tions are. disposed for the ready placement of the
to a mounting slide 26. This slide is arranged
workpiece thereover, the instrumental construc
tion and arrangement of parts being such as to 20 within a slot 25' of the standard 9 for sliding ad-l
justment effected by an adjusting screw 21, the
reduce the number of operations to a minimum
latter being threaded through the slide 26 and
for measuring or testing a workpiece, thereby
journaled in the standard 9 for being turned by
facilitating the handling of workpieces in quan
the knob 23. Upon rotating the knob the slide
will be advanced or retracted and accordingly
Referring more particularly to the drawings:
vary the adjustment of the ?xed calliper ?nger
Fig. 1 is a plan view of the gauging or com
23 in the table slot 2%. By tightening the set
parator instrument with portions thereof shown
screw 2'!’ against the adjusting screw 27 the
inhorizontal section and'other portions broken
position of the latter maybe ?xed.
away; i
The carriage 25 is supported at its opposite
Fig. 2 is a side or front elevation of the instru 30 ends by a pair of parallel links which may be in
ment embodying the present invention;
the form of flat springs 29, the links having their
Fig. 3 is a top plan view of the work engaging
lower ends ?xed to the standard 9 by screws 3i‘!
part of the instrument.
and their upper ends secured to the carriage by
Fig. 4 is an end view of such work engaging
screws 31. This mounting provides a support
part; and,
for the movable or ?oating calliper ?nger 22
Fig. 5 is a‘ transverse vertical sectional view
practically free from friction and yet movable
taken about on line 5-45 of Fig. 3.
in a substantially horizontal plane. The for
duction methods of present day factory practice.
Referring more particularly to the drawings,
the numeral l designates the base of the instru
ward one of the spring links 29 is formed with
an aperture 29' to permit the plunger 3 passing
ment on which is mounted a micrometer mech—
therethrough into direct contact with the car
anism 2 having an actuator in the form of a 40 riage. The movable calliper ?nger may be given
plunger 3 operable through a motion amplifying
leverage generally indicated at 4 to impress the
limited adjustment on it's ?oating support by
means of a slot 32 in the carriage, the latter be
ing urged against the plunger 3, or an adjust
closing casing l’. Plus and minus tolerance in 45 able extension 33 thereof, by a spring 34 which
is anchored at one end on the standard carried
dicators B may be associated with the pointer 5
pin 35 while its opposite end is engaged over a
in the window for the comparative testing of
pin 36 on the carriage. This spring tends to
workpieces with respect to a master piece, such
ward separating the calliper ?ngers, moving them
micrometer mechanism forming the subject mat
to their work engaging position.
ter of an earlier patent, N 0. 2,362,283.
dimensional characteristic on a pointer 5 show
ing through a window 6 of the mechanism en
The base I is provided with an upright stand
ard 9 having a well H3. A work squaring table
Normally, however, the calliper fingers are held,
in contracted relation for the ready placement‘
of a workpiece thereover, and this normal rela
tionship is effected by a coiled spring 31 acting
II ‘has a depending shaft I2 guidingly ?tting
withinv the well and is yieldably supported by a 55
on the short arm of a retractor' lever 38 to coun
teract the action of the spring 34 on the carriage
25. The short arm has a lateral lug 39 normally
engaging a shoulder 40 of the carriage, and upon
depressing the ?nger pad 41 the retractor will
pivot about its mounting pin 42 to release the
carriage for movement by its spring 34 against
the micrometer gauging plunger 3 which in turn
transmits any imparted movement to the
‘pointer 5.
For snap gauging use of the instrument, the
retractor may be held inoperative or in its de
pressed position against the tension of its spring
31 by a latch pin 43 which is slidably mounted in
the standard 9 for projection over the ?nger pad
4|, as indicated by the broken lines in'Fig. 1.
The calliper ?ngers have their active portions
disposed in coplanar relation, as shown. in. Fig. 3,
to engage diametrically opposing portions in a
recess 44 of the workpiece 45 (Fig. 2) when re
leased by the retractor. To center the work
piece for so engaging such opposed portions there
is provided a centering pin 46 in the form of a
screw which is adjustably carried on a supporting
checking a given part of the workpiece the table
may be ?xed by setting the screw 20, but where
it is desired to check a long bore at plural points
the workpiece may be pressed downwardly to
depress the table for the desired extent while the
table the meanwhile supports the workpiece in
its normal position at all times. After countere
acting pressure is relieved the spring 13 will re
store the table to its normally elevated position
as determined by the location of the lower stop
[4. The parallel spring linkage 29 provides a
practical support for holding the movable ?nger
212 in an upright position throughout its gauging
range for greater accuracy, the carriage actually
a part of this ?nger for impressing its
movement on the actuator 3. Because the ?nger
is normally spaced from the actuator the microm
eter .mechanism will be protected against im
parted movement attending the placement and.
20 removal of the workpiece over the ?ngers, the
actual movement of the plunger being relatively
small as compared to the movement of the car
riage allowed to facilitate the placement of the
workpiece over the contracted ?ngers.
post 41. By means of this construction the'cen
While the foregoing description has been given
tering pin is disposed radially in the recess and 25
in detail, it is not intended thereby to restrict
serves to dispose the calliper ?ngers in a diam
the invention since the inventive principles in
etral plane thereof normal to the centering
volved are capable of embodiment in other physi
pin. If a larger recess or bore is to be gauged
cal structures without departing from the spirit‘
the-centering pin will be extended a greater dis
tance from its post '41, and if a smaller recess is 30 of the invention or the scope of the appended
to be checked the pin will be withdrawn. The
What is claimed is:
post 41 is mounted in normally ?xed relation
l. A gauge comprising an indicator, an-actua
with the stationary calliper ?nger 23 although
tor connected thereto by motion amplifying
it may be adjusted to accommodate di?erent sizes
of recesses. For this purpose the post 41 is formed 35 means, a pair of internal calliper ?ngers, one
?xed and the other movable, a ?oating support
with a slot 48 through which the slide 26 extends.
carrying the movable ?nger, resilient means act'
By means of a clamp nut 49 thepost is clamped
ing through the floating support to move the
?rmly against the side of the standard 9, the nut
actuator as permitted by the engagement‘of the
reacting through the slide to draw the head 53,
on the inner end of the slide, clampingly against 40 movable ?nger with a workpiece,an upright‘post
interposed between the ?ngers and a transversely
the base portion of the'calii-per ?nger 23. ‘Con
extending centering pin projecting from the post
sequently the tightening of the nut effects the
at a normal to the plane of movement of the
securement of both the calliper ?nger and the
movable ?nger and cooperating with both ?ngers
post simultaneously.
In use, the calliper ?ngers are normally in , to provide -a. three-point contact within a recess
in the workpiece for centering the latter one-the
contracted relationship for having the workpiece
placed thereover and thereafter the retractor is
2. A comparator gauge comprising a pairof
depressed to release the ?oating carriage for ac
internal calliper ?ngers for engaging diametri
tion by its spring 34. The movable calliper ?nger
cally opposed points on a wall of a recess in a
22 will thereupon move against the recess wall
workpiece, one ?xed and the other movable, re
of the workpiece while the ?xed calliper ?nger 23
leasable means normally holding the ?ngers in
is engaged at a diametrically opposed point, being
contracted relation, a work centering'pin, a post
supported laterally by the centering pin 46, ‘as
supporting the pin radially between the ?ngers
shown in Fig. 3. The extent of movement of the
movable ?nger will be impressed on the plunger 55 and normal to the plane of the ?ngers to’ co
operate with the latter in providing -a three
3 and indicated by the pointer 5. If the pointer
point contact with the‘ workpiece, and means for
moves beyond or short of the two tolerance in
adjusting the centering pin on the post and with
dicators 8, the workpiece will be rejected‘ as being
respect to the ?ngers.
oversize or under size. If the pointer rests be
3. A gauge having a base, a pair of internal
tween the tolerance indicators, the workpiece‘is 60 calliper
?ngers, a-slide adjustable onthe base and
acceptable. By reason of the fact the ?ngers
having parts extend from the opposite side there
are normally contracted with respect to each
of, one of the ?ngers being ?xedly carried by one
other, the checking of quantities of workpieces
part of the slide, a ?oating support for the other
may be accomplished in rapid succession since
it is only necessary to manipulate the vretractor 65 ?nger, means for adjusting the slide to position
its ?nger, a work centering post adjustably car
once in the testing of each piece.
ried by the other part of the slide, and means
When the instrument is used for snap‘ gauging,
acting concurrently to secure the centering post
during which operation the retractor will be nor
and the slide carried ?nger at their given ad
mally held depressed by the latch ‘pin 43, the
workpiece is arranged over the ‘then normally 70 justments.
4. A gauge comprising ‘a'base, a'pair of internal
separated calliper ?ngers and the indication by
calliper ?ngers, one of which ?ngers being ?xed
the pointer promptly noted without further
to the base, means supporting the other ‘?nger
for movement against the wall- of ya recessin a
The workpiece will ‘be properly ‘supported 'by
workpiece, a work squaring table having a slot
the work positioning :or squaring ‘table 11. "For
through which the ?ngers extend at a normal to
the table surface, manually controlled means be
neath the table operable to so move said other
the table to project the ?ngers more or less in
the recess of the workpiece in accordance with
the hand pressure on the latter, stop means ad~
?nger, means resiliently supporting the table for
justably regulating the extent of table depression,
up and down movement under hand pressure to
project the ?ngers more or less, and cushion
means for limiting such up and down movement.
5. A gauge comprising a base, a pair of inter
said stop means.
and means for cushioning the table arrest by
'7. A gauge comprising micrometer mechanism
having an indicator and an actuator, a pair of
nal calliper ?ngers, one of which ?ngers being
calliper ?ngers, a support, on which one ?nger
?xed to the base, means supporting the other 10 is ?xed, resilient means yieldably urging the other
?nger for movement against the Wall of a recess
?nger toward an operative relationship with re~
in a workpiece, a work positioning table having
spect to the actuator to impress the position of
a slot through which the ?ngers extend at a
the movable ?nger on the indicator, spring means
normal to the table surface, means resiliently
normally acting in counteraction of the resilient
supporting the table for up and down movement 15 means to hold the movable ?nger out of operative 7
to project the ?ngers more or less, manually con
relationship with the actuator whereby a work
trolled means beneath the table operable to so
move said other ?nger, and means for holding
piece may beplaced against the calliper ?ngers
Without affecting the micrometer mechanism, a
the manually controlled means inoperative.
Work table having a slot through which the ?ngers
6. A gauge comprising a base, a pair of internal
project upwardly, the slot extending in the direc
calliper ?ngers, one of which ?ngers being ?xed 20 tion of movement of the movable ?nger, means
to the base, means supporting the other ?nger
resiliently supporting the table for movement
for movement against the wall of a recess in a
transverse to that of the movable ?nger, and
workpiece, a work squaring table having a slot
means manually controlled for releasing said re
through which the ?ngers extend at a normal to
silient means for functioning as aforesaid.
the table surface, means ‘resiliently supporting
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