Патент USA US2006161

June 25,‘1935.
.1. c. DRADER
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2,006,161
CHECKING FIXTURE
Filed Nov. 15, 1929
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June 25‘; 1935“
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2,006,161
J. c. DRADER
CHECKING FIXTURE
Filed NOV. 15, '1929
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2 Sheets-SheetZ
2,006,151“
Patented June 25, 1935
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1‘ OFFICE
UNITED STATES
2,006,161
CHECKING FIXTURE
Joseph C. Drader, Detroit, Mich, assignor to
Michigan
>. Michigan. Tool Company, a corporation of
Application November 15, 1929, Serial No. 407,500
1 Claim. (Cl. 33——174)
This invention relates‘ to testing machines slotted ‘at each' end thereof to snugly ?tv and
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particularly suited for worm generating cutters. slide on said guide bar.
Means is provided for sliding the carriage ’ II)
. The main objects of this invention are to pro
vide an ‘improved testing machine which 'will on its ways, and this. means preferably comprises
5 visually indicate a‘ minute irregularity in the a lead screw 20'journa1ed against‘ axial move; 5.
surface of a piece of ‘work; to provide a'testing ment in an upstanding bracket 2! integrally
m'a'chinefor accurately checking the angularity formed on one end of the bed plate medially of
of. the sides of the teeth of a Work unit such as the-ways 6 and l. The'screw 20 is threaded into‘
a gear 'cu'tterfand to provide a simple and ac the adjacent end of the carriage I0‘ and a'hand‘ »
10 curate machine of‘ this character which is read~ wheel 22 is shown as rigidly secured on the end 10
ily. adjustable to'test pieces of work which vary thereof which projects through the bracket 2|,
by a nut 23. ‘A sleeve or collar 24 maybe inter
in size within a ‘wide range.
‘
‘An illustrative embodiment of this invention ‘ posed between the hand Wheel 22 and bracket
is"“shown ‘in the accompanying drawings, in 2!, and indexed‘ to co-operate' ‘with a mark‘ on
15 which
the bracket, for measuring movement of ‘ th‘e " 15
' Fig.1l is a top plan view of the improved test carriage ‘relative to the bed ‘plate. A knurled
ing machine, with a piece of work in position headed set screw 25 is shown‘ asl'threaded 1n,
thereon,"vv and with ‘its. position when reversed, the sleeve 2ll'for releasably‘ securing ity to the
shown in dotted 1 outline.’
Fig. 2 is a View in'front elevation of the same.
screw at any desired circumferential position.
The carriage- it, at its rear side, is provided 20
Fig. 3 is‘ a‘fragmentary view in front eleva with an upstanding bracket 26, shown as integral
tion, ‘with a master gauge form on the work ly, formed thereon, which has a vertically dis
supporting ‘spindle.
Fig. 4 is a' sectional view
25
posed, parallel sided slot therein which provides '
taken on ' the line
44-44‘ of Figl'2, looking in the direction indi
guideways 21. The guideways 21 slidably sup?
port a gauge frame 28 (see Fig. _1) which is
25]
cated ‘by the arrows.
In the construction shown in the drawings,
an elongated bed plate frame 5 is provided on its
shown as embraced thereby and'which is pro
vided with a nut 29 and washer'30 which bear‘
upper ‘side with horizontally disposed parallel
The top end of the slot which‘forms the ways
21 is closed by a crosshead '31 secured by screws 30.
30 ways. 6 and 'l which are bounded along their
against the rear face of' the'ways.
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outer sides by upstanding ?anges 8 and 9 respec
32 to the top end of the bracket 26. ‘The cross-
tively.
head ‘3i may snugly receive a vertically disposed
‘A carriage I0 is slidably mounted on the ways
lead screw 33 which is‘ threaded through the ‘
6 and 1, between the upstanding ?anges 8 and gauge frame28 for adjusting said frame verti
9, ; Means are ~provided for resiliently holding cally with respect to the carriage ‘Ill and bed 35
down and effecting a predetermined frictional plate-5. A handle 34, having a pair of upstandi
restraint to the sliding movement of'the car ing vdiametrically opposed pins .35 and 36,'is '
riage; and said means may comprise vertically shown as rigidly mounted on the topv end of the
disposed studs i lm-and t2 which extend upwardly, lead screw 33‘ for facilitating manual rotation
40 , through-slots l3 and M respectively formed in
the bed plate parallel with the ways. The upper
ends ofthe studs" ii and I2 are threaded into
the carriage l0 and.’ thelheads thereofv are in
spaced relation to the under side of the bed
plat€-;.l.BDWZshaped leaf. springs l5 and it are
interposed between the heads of the studs, and
thereof.
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A visual-indicating- gauge 31 is rigidly mount
ed on the frame 28 by a knurled headed screwv
38 which passes through alug 39 on thegauge
and is threaded into the ‘frame 28. The in-f
dicator 3i is preferably graduated to one thou
sandth of ‘aninch, and the face thereof . is pref‘
are mounted thereon at their medial points with erably rotatable so that all readings xmay .~ be‘.
the ends thereof frictionally bearing against the
under side of the bed plate.
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taken from zero, if desired.
‘
The gauge frame 28 is shown as-provided with
The bed plate 5 is also preferably provided an arm ‘it integrally formed thereon which ex 50
with a longitudinally extending, medially dis tends downwardly and toward the end of the bed.
posed guide bar ll rigidly mounted on the top plate opposite to the end having the lead screw
side thereof by studs I3 and i9 which pass up for moving the carriage. The lower end of the
through suitable apertures in the bed plate and arm 40 has a lever M pivoted thereon by a stud
5 screw into the bar. The carriage is suitably screw 612. One end of the lever may be bifur 55
2.
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2,006,161
Each tooth is successively brought ‘into and
cated as shown at 43 to embrace a pin in the
lower end of an indicator operating connection
held in position as described, and when the
44, and the other end thereof may have the form
same side of each tooth on the cutter has been
of a pointer or ?nger 45, adapted to contact with
thus examined, the cutter may be removed from
Cl the surface of the piece of work to be tested, the
the spindle and replaced in reverse position so
.lever 4| thus serving as part of a connecting
meansv between ?nger 45 and gauge 31.
Any suitable means may be provided for sup
porting a work unit to be tested, and the illus
that the opposite sides or faces of the cutter
The upper end of the bracket arm has one end of
thus positioned for co-operation with the pointer
teeth may be similarly tested. In thus revers
ing the cutter, the nut 49 and collar 50 are
removed to permit removal of the cutter 5|, and
10 trated means comprise an upstanding bracket before the cutter is replaced in reverse position a 10
arm 46 integrally formed on the bed plate 5 at suitable spacing collar is placed on the support and
the rear side and adjacent to one end thereof. is then followed by the cutter, the latter being
a suitably disposed work supporting spindle 41‘
15 rigidlysecured thereto, as by ‘a nut", the-axis
of said spindle being, in the illustrated instance,
perpendicular to the plane of movement of the
carriage 10. The other end of the spindle is
45; in case both of the sets of the faces of the
teeth- 52 are alike, or comprise lines that__either 15
terposed between the nut andapiece of work 5|.
The piece of work ‘5| shown in vFigs. 1 and 2
of the drawings is a, worm generating cutter in
25 whichthe teeth (52 thereof have plane sides.
'-It ‘will vbe evident that there must be some
cylindrical surface to which each straight line
elementcomprised in any tooth surface of the
illustrated vtype is tangent; and any member
:whiohprovides a surface sustaining this relation
cylinder forms being used anda corresponding"
adjustment in any appropriate direction and/or
plane being secured, as by moving the gauge‘
frame 28 in its guideways by rotating the lead 25
screw 33 in the appropriate direction.
Although but one speci?c embodiment of thisv
invention has been herein shown and described,
it will be understood that numerous details of
should be included in the mentioned tangential
plane or should varytherefrom only in a pre
determined‘ manner, the above procedure may
shown as provided with retaining means in the then be repeated.
20 form of a knurled hand nut 49 which abuts
Various sized cutters and pieces of work may
againstga freely slidable spacing sleeve 50, in be tested on this machine, appropriate to master
the construction shown may be altered or omitted
30 “
to successive corresponding surfaces provided without departing from the spirit of this inven
by the teeth of any gear, any gear cutter or like tion, as de?ned by the following claim‘; and that
work-unit that is to be tested is hereinafter re the described method, as. applied to a cutter
ferred to as a “master cylinder” or form,—said whose tooth surfaces should lie in substantially
; member being suitable for use in the zero-setting radial planes, comprises ?rst determining a plane
of the pointer or-dial of gauge 31; and, in the tangent to a cylinder having a ?xed axis; ‘zero
operation of this device, it will accordingly be setting a gauge'which is provided with a ?nger
understood that, to establish a tangent plane (said ?nger being then disposed in‘said plane, as
at the desired level, a master cylinder form 53 by reason of its engagement with a master form
may ?rst be placed on the work spindle 41 and concentric with said axis): thereafter disposing 40
the carriage l0 and ‘frame 28 may be moved un a work unit concentrically with said'axis ‘and
til-the end of the ?nger 45‘ is on the top'dead so that a point in its surface that is to be‘ tested‘
centerv ‘of the cylinder. In thus positioning the lies in said plane and in engagement with said
?nger 45, suflicient pressure is placed thereon ?nger; and producing a relative parallel trans
:5 by appropriate vertical movement of the gauge latory movement between ' said unit and said 45
frame 28‘ so- that the pointer hand of the gauge gauge with reference to said plane while observ
will- move 'eitherway from the set position all ing said gauge.
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back lash or lostinotion between parts being
I claim:
taken up; The'indicator gauge is then observed
A device for testing the teeth or thread of an
'1 and preferably set with a zero reading.
element the sides of which are tangent to a circle, 50
The carriage is then withdrawn by rotating which includes, in combination, a base, a ?nger,
the handwheel 22 and lead screw 20,: and the an indicator actuated thereby, an arbor ‘upon'
cutter or otherwork unit to be tested put on the which the element to be testedmay be supported,
spindle 41 in the place of the master cylinder. a cylinder of the same diameter as the base
The carriage may then be moved until the ?nger circle of the element to be tested disposable on 55
45,its tip being raised orv lowered, if necessary, said shaft for setting the indicator 'to have the
' is- brought opposite and into engagement with ?nger disposed to move in a plane vtangent to
the outertip of a cutter tooth and the cutter the base circle of said element, means for secur
rotated onlthe spindle until the reading is again ing an element to be tested on the arbor to have
. zero. The cutter 5| may then be clamped by the the side of its tooth in engagement with said .00
hand'nut 49 and the carriage moved forward to ?nger when the indicator shows said setting, and
ward the spindle so as to cause the ?nger 45 means for advancing said ?nger over said tooth I
to slide on the surface of the tooth. Depressions or thread to explore the surface thereof.
or raised spots as well as any error in the angu
052 larity of thatside of the tooth which is thus‘
tested may be seen by observing the movement,
it any, ‘of the pointer on the gauge 31.
JOSEPH C. DRADER.