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Патент USA US2412721

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` Dec. 17, 1946.
_A.` M. DRAKE
2,412,721
ADJUSTING DEVICE FOR LAPPING TOÓLS
Filed NOV. 18, 1944
:s sheets-sheet'l
INVENTOR.
`
Dec. l?, E946.'
A. M. BRAKE
ZAHZÄEÈ
ADJUSTING DEVICE FOR LAPPING >TOOLS `
Filed Nov. 18, 1944
3 SheetsjSheet 2
fig@
/
.
BY
/K
Dec. 17, 1946.
'A_ M, DRAKE
2,412,721 '
"
ADJUSTING DEVICE FOR LAPPING TOOLS
Filed Nov. 1-8, 1944 '
3 Sheets-Sheet 3
bvmm,
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INVENT0R.
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Patented Dec. 17, 1946
2,412,721
UNITED STATES PATENT OFFICE
2,412,721
ADJU STIN G DEVICE FOR LAPPING TOOLS
Alden M. Drake, West Hartford, Conn., assignor
to Niles-Bement-Pond Company, West Hart
ford, Conn., a corporation of New Jersey
Application November 18, 1944, Serial No. 564,155
6 Claims.
(Cl. 51-184.3}
2
This invention relates to lapping machines
arbor showing one of the impact members in
and particularly to a machine for lapping in
retracted position.
ternal cylindrical surfaces to precision dimen
Fig. 5 is a cross sectional view of the arbor
sions.
and lap taken on the plane of line 5-5 of Fig. 4.
An object of the invention is to provide im
Fig. G is a longitudinal view partly in section of
proved lap adjusting means in a machine for 5
another iorm of impact means.
automatically actuating a work piece being
Fig. ’7 is an end elevation of the impact means
lapped over the surface of a lapping tool which
shown in Fig. 6.
may be rotated simultaneously with reciproca
Fig. 8 is a longitudinal sectional view of a part
tions of the work piece.
10 oi the mechanism shown in Fig. 6, the section
Primarily it is an object of the present inven
beingtaken on the plane of line 8_8 in Fig. 6.
tion to provide impact means manually applied
Fig. 9 is a horizontal sectional View of parts
under controllable conditions to slightly vary the
shown in Fig. 6, the section being taken on the
effective diameter of the lapping tool during the
plane of line 9-3 in Fig. 6.
lapping operation.
`
A feature of importance is that the impact
15
Fig. 1G is a sectional View of of a. part of the
impact mechanism for reducing the size of the
lapping member, the section being taken on the
plane of line lll-lli in Fig. 7, and
means are operative in one direction to increase
the effective diameter of the lapping surface and
in the opposite direction to decrease the effective
Fig. l1 is a sectional view of parts shown in Fig.
diameter.
20 7, the section `being taken on the plane of line
Another feature of advantage is that the two
ií~--íl in Fig. 10.
impact means are independently actuated and
may be adjusted individually over wide ranges,
In the above mentioned drawings there have
been shown two embodiments of the invention
so that but one or both impact means may be
`enflployed to any extent that may be necessary
to make the desired adjustment.
With the above and other objects in view the
invention includes the features of construction
and operation set forth in the following spec
ification and illustrated in the accompanying
drawings.
In the accompanying drawings annexed here
to and forming a part of this specification, I
have shown the invention embodied in a hole
lapping machine for rolls of small size used in
dimension gages but it will be understood that
the invention can be otherwise embodied and
that the drawings are not to be construed as
defining or limiting the scope of the invention,
the claims appended to this speciñcation being
relied upon for that purpose.
In the drawings:
Figure 1 is a vertical sectional view taken‘longi
tudinally through the principal parts of a ma
chine embodying one form of the present in
vention.
Fig. 2 is a longitudinal sectional view in eleva
tion showing one form of impact means for forc
ing a lap axially along its arbor to slightly vin
crease the size of the lapping surface during the
lapping operation.
Fig. 3 is a detail view of parts shown in Fig. 2
taken from below.
Fig, ‘iis _a longitudinal view of _a lap on its
which are now deemed preferable, but it is to be
understood that changes and modifications may
be made within >the scope of the appended claims
without departing from the spirit of the inven
tion.
In lapping rotatably mounted members for
gages it is essential that the holes by means of
which they are mounted ‘ce of uniform diameter
from end to end and without bell-mounting. The
rolls must fit their arbors closely and evenly from
end to end so that they will not tilt during use
but will rotate smoothly on their arbors about a
ñXed axis. lieretofore precision lapping of in
ternal cylindrical surfaces has, for the most part,
Abeen done manually, the work piece being held
v manually in position upon a rotating lappingA
tool on a suitabie spindle and slowly reciprocated
back and forth during rotation of the spindle
vand lapping tool. The lap usually comprised a
split cast iron sleeve charged with abrasive and
45 fitting tightly but resiliently over a slightly ta
pered arbor secured to the spindle. To expand
the lapping surface the sleeve having the lap
ping surface was forced axially along the ta
ered arbor.
50
_
The present invention relates particularly to
impact `means for forcing the expansible lap pre
determined slieht amounts axially during the
lapping operation to slightly increase its diam
eter, other impact means also being provided to
move the lapping tool in the opposite direction
2,412,721
on its arbor to reduce slightly its lapping diam
eter.
`
Briefly, and in its preferred aspect, the inven
tion may include the following principal parts:
First, a spindle adapted to be rotated by any
4
22 may, therefore, by rotation, be accurately ad
justed so that when forced forward it will strike
the lap 29. Also, by disengaging the detent 25,
the plunger 22 may be quickly moved any dis
tance in either direction. The forward or strik
ing end of this plunger 22 may be provided with
appropriate means and having means at its for
an adapter 29 rotatable within the plunger 22
ward end to mount an arbor extending axially
and recessed to ñt over the end of the lapping
from the spindle; second, a, plunger aligned with
arbor I9 and directly engage the front face of
the lapping spindle and adapted to be resiliently
the sleeve 23 forming the lap.
retracted and released for forward movement to 10
In order to control the force of the blow ei»
strike the end of the lapping tool so that the
fected by this >plunger 22, means are provided
position of the lapping tool on its spindle may
to adjust the pressure of the helical spring 24.
be adjusted axially to slightly increase its diame
As will be seen in Fig. 2, the helical spring is
ter; and third, a second plunger mounted for
housed in the bracket 2l within a suitablev recess.
rapid forward movement and adapted to engage
The forward end of the spring 24 bears against
a member bearing against the opposite end of
the head of a bolt 2l extending thro-ugh the
the lapping tool and move it axially to slightly
bracket 2l and through a portion of the retracti
decrease its diameter.
ble member 23. The outer end of this bolt 21 is
Referring more in detail to rthe figures of the
threaded and is engaged by a suitable manual
drawings and first to Fig. l, I provide a spindle I0 20 adjusting nut 2S. By rotation of this nut 28 the
adapted to be driven by a bevel gear I I on a‘short
pressure of the helical spring 24 forcing the re
shaft I2 in alinement with the spindle I9 and
tractible member 23 toward its forward position
which in turn may be driven through any suit
may be widely varied.V In order to effect the de
able connections such as a driving bevel gear I3
livery of the blow by plunger r22 against the end,
25
connected by means no-t shown to a suitable
face of `lap 23` a hand lever 29 is provided having
source of power. 'At the forward end of the spin
a projection `or latch 30 adapted to engage a de
dle is an arbor I9 extending axially therefrom
pending pontion of the retractible member 23 so
and preferably detachably mounted thereon.
that by oscillation of this handle 29 the projec
Above the spindle Ill is a reciprocated mem
tion will be disengaged from the depending por
ber I4 on which is mounted a work holder SI 30 tion of the retractible member 23 after a prede
within which the work piece being lapped is
termined retractive movement. This will release
mounted for reciprocatory movement along the
the retractible member 23 for forward move
arbor I9 during the lapping operation.
ment under the adjusted pressure of the helical
The above members are or may be similar in
every way to corresponding members in my co
pending application Serial No. 520,257, filed Jan
Yuary 29, 1944, of which the present application
spring ‘24.
To adjust the plunger 22 so that it
will Contact the end face of ‘the lapping tool and
advance this tool a predetermined distance when
released, it is only necessary to rotate the plunger
is »a continuation in part.
22 within the retractible member 23.
The lapping member 29 may be similar to the
Figs. 6 to 11 show another form of impact
member shown in «the above referred to appli 40 means for action upon the lapping member 20
cation and formed of cas-t iron or other metal
to move it axially along its arbor in either direc
slotted longitudinally throughout its length and
tion to increase or decrease the effective diame
bored to fit a slight :tapered portion of the ar
ter of its lapping surface.
bor I9.
In the mechanism shown in Fig. 6 et seq. for
In order to adjust the position of the lapping
advancing the lap 2i) in a direction to increase
member or sleeve 2l) upon its arbor I9 to vary
its effective diameter, a construction veryV similar
its effective diameter as required during the lap
to that shown in Fig. 2 is employed. This
ping operation, impact means are provided which
mechanism has a retractible‘plunger 32 which
may be actuated manually todeliver a carefully
may be adjusted axially toward or from the
regulated blow upon an end face of the split ,
lapping tool 29 by means of a threaded portion
sleeve forming the lapping tool 29 to» force this
thereon and the impact may be adjusted by a
member axially on its arbor I9 a slight but pre
helical spring 34 adjusted by a manually rotat
determined distance depending upon the force
able nut 35. The blow may be delivered by de
of the blow; Figs. 1, 2 and 3 show one form of
impact mechanism acting in one direction only
to increase the diameter of the lapping surface
of the lapping tool. To effect this impact ad
justmenlt of the lap 29, a bracket ZI is mounted
upon the base of the machine having a plunger
22 therein disposed accurately in alinement with
the spindle Iii and arbor I9. This plunger 22 is
mounted within the retractible member
within
‘the bracket 2l and is normally forced toward the
pressing a plunger 36 to release a latch 31 from
a member 39 within which the plunger 32 is
60 ¿
mounted attached to the plunger 32‘ to force the
plunger toward the lap. The above described
mechanism is mounted on a fixed .bracket 38 and
will~be clear by an examination of Figs. 6, 7
and 8.
In order to deliver a blow in a direction to
move the lapping tool 2i) along its arbor I9 in a
direction to reduce its effective diameter, the
retracting this member 23 compresses the spring 65 following, mechanism is employed. Withinthe
bracket 38 supporting the plunger 32 for in
24, then, upon. release of the member 23 the
creasing the diameter of the .lap is a second
plunger22 will be yforced forwardly and _its end
plunger 40 which may be retracted manually Y»
face will be brought into contact with and force
against the pressure of a coil spring 4I and~ re
the lapping rtool 20 axially along its arbor I9.
leased by simply releasing the handle. The pres~
To adjust the axial position of the plunger 22
sure effected by the spring ¿I may be regulated
so that its end face will strike the end of lap
by
a threaded nut 52, rotation of which varies
ping sleeve 29, the plunger 22 may be threaded
the ‘compression ofthe spring 4l to any prede
-throughout the major portion of its length, the
termined degree. The inner or active end _of
threads of which engage a retractible detent 25
the plunger 4l) is' within -striking distance of an
mounted within the bracket 2|. The plunger
lapping spindle by a helical spring 2d. Manually
2,412,721
arm 43 pivoted substantially at its central posi
tion on a horizontal axis 44 so that it may swing
in a vertical plane. The plunger 40 strikes the
lower end of this vertical pivotal arm 43'. and at
its upper end is provided with a member 45
adapted to strike against an abutment member
46 engaging against the inner end face of the
sleeve 20 forming the lapping tool. A spring 41,
as shown in Figs. '7, 10 and 11, serves to retain
the arm 43 in its vertical striking position and
a pendulum 48 supported within a horizontal
bearing in the bracket 38 at the upper portion
of the arm 43 serves to hold in vertical position
the head 45 engageable against the striking mem»
ber 46 when the arm 43 is oscillated by the 15
plunger 40.
What I claim is:
1. An adjusting device for lapping tools of the
expansible sleeve type, said device comprising a
striking plunger mounted in alinement with 20
said sleeve and movable into contact with an end
face of said sleeve while mounted on its spindle,
means normally forcing said plunger in one
direction, retracting means for said plunger, and
means to release said plunger from a retracted
position, whereby said plunger may strike and
force said sleeve axially on its spindle.
2. An adjusting device for lapping tools oi the
expansible sleeve type, said device comprising a
striking plunger mounted in alinement with said
sleeve and movable into contact with an end face
of said sleeve while mounted on its spindle,
means normally forcing said plunger in one di
rection, retracting means for said plunger, and
whereby said plunger may strike and'i'orce said
sleeve axially on its spindle.
\
4. An adjusting device for lapping tools of the
expansible sleeve type, said device comprising a
striking plunger mounted in alinement with said
sleeve and movable into contact with an end face
of said sleeve while mounted on its; spindle,
means normally Aforcing said plunger in one di
rection, retracting means for said plunger, means
to adjust the plunger axially relative to its re
tracting means, and means to release said re~
tracting means from a predetermined .retracted
position whereby said plunger may strike and
force said sleeve axially on its spindle.
5. An adjusting device for lapping tools of the
expansible sleeve type, said device comprising a
striking plunger mounted in alinement with said
sleeve and movable into contact with. an end
face of said sleeve while mounted on its spindle,
and a second plunger mounted parallelly to said
ñrst plunger to actuate a pivotal arm into posi
tion to strike the sleeve at its opposite end, means
normally forcing said plungers in one direction,
separate retracting means for said plungers, and
means to individually release said retracting
means from predetermined retracted positions
whereby said plungers may Aforce said sleeve
axially on its spindle in either direction.
6. An adjusting device for lapping tools of the
expansible sleeve type, Said device comprising
parallel striking plungers, one of which is mount»
ed in alinement with said sleeve and movable
respectively into contact with an end face of
said sleeve while mounted on its spindle, means
means to release said retracting means from a 35 normally forcing said plungers in one direction,
predetermined retracted position, whereby said
individual retracting means for said plungers.
plunger may strike a regulatable blowv and force
and means to release one of said retracting
said sleeve axially on its spindle.
means from a retracted position whereby its
3. An adjusting device for lapping tools of the
plunger may strike and force said sleeve axially
expansible sleeve type, said device comprising a 40 on its spindle in a direction to enlarge the di
striking plunger mounted in alinement with said
ameter of said sleeve, and means to release the
sleeve and movable into contact with an end
other of said retracting means from a retracted
face of said sleeve while mounted on its spindle,
position and force its plunger in a direction to
means normally forcing said plunger toward its
engage a striker and oscillate said striker against
striking position, retracting means for said
the opposite end of said sleeve.
plunger, and means to release said retracting 45
means from a predetermined retracted position
ALDEN M. BRAKE.
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