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Патент USA US2412306

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Dec. 1o, 1946.
2,412,306
R. Smm.
LAPPING‘APPARATUS
Filed Aug. 25, 1944
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HTTORNEY
Patented' Dec. 10, 1946
`_ 2,412,306
`ÍuNrrED STATES PATENT _oEFicE
LAPPINGAPPARATUS
B_,einhold Stoll, Elgin, Ill., asslgnor to Western
Electric' Company, Incorporated, New York,
N._Y., a corporation of New York
’
Application August 25, 1944, Serial No. 551,188
11 Claims.
1
2
This invention relates to a lapping apparatus
and more particularly to an apparatus for lap
ping thin parts, such as feeler gages.
In lapping parts like feeler gages, dimculty has
portion of the stud projecting from said sur
been experienced in securing flat and parallel
faces on said parts when they are not perfectly
dat before lapping. A curved or bowed part may
be lapped to a desired thickness, but, when re
moved from the lapping machine, may resume
face
Il.
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.
Retaining plates or members 24 are secured
to the sides of the upper lapping member I4 by
screws 25, which pass through enlarged apertures
26 therein. The retaining plates extend down
wardly beyond the lower surface I5 of the mem
ber I6 and extend across the length and width
thereof to form a retaining well or rim around
its bowed shape, which may nullify its useful 10 the lower edge of the member I4, which rim is
ness.
An object of the present invention is to provide
an ede'ctive lapping device for accurately lap
ping parte.
spaced from the lower lapping surface II to pro
vide clearance sufficient to permit the lapping
of the work. This rim serves to retain the parts
being lapped between the lapping surfaces. An
.
In accordance with one embodiment oi the in
vention, there is provided a stationary lower
lapping member and a movable upper lapping
15 aperture 2i is provided in Ithe upper lapping
member id for the reception of one end of a
crank 'it of a suitable rotary device for impart
ing a rotary motion to the lapping member it
member resting thereupon and spaced therefrom
or, if desired, the lapping member It may be op
by a plurality of adjustable supports capable of
being worn away and supporting the upper lap 20 erated manually.
In the operation of the lapping apparatus, all
ping member to prevent undue pressure on a part
to be lapped in the initial stages of thelapping ’
the studs iii are accurately adjusted so that the
projecting ends extend out from the lapping sur
operation, the supports wearing away as vthe`
face I5 a distance equal to or slightly in excess
lapping of the part proceeds.
The invention will be more fully understood 25 of the overall thickness of the part to be lapped,
which may include the thickness of the part, plus
from the following description taken in con
any deformations or irregularities, such as a
junction with the accompanying drawing illus
'slight bow or curvature. The upper lapping
trating one embodiment thereof, in which
member is removed from the lower lapping mem
Fig. l is a perspective view of the lapping ap
30 ber and the workto be lapped as, for example,
the part 3G, is placed thereon and the upper lap
Fig. 2 is a vertical cross' section of the lapping
ping member it is positioned over it. The over
apparatus taken on the line 2-2 of Fig. l; and
all distance between the` two parallel lapping
Fig. 3 is a bottom plan view of the upper lap
faces i5 and ii will be equal to or in excess of
ping member.
Referring to the drawing, there is shown a 35 the vertical dimension from the plate II to the
uppermost portion of the part 30. The lapping
lower stationary lapping member i@ having a
member ifi may then be moved in a rotary mo
flat lapping surface II provided with parallel
tion, either manually or yby connecting it to a
longitudinal and transverse scoring I 2. An up
driven crank for automatic operation. As the
per lapping member i@ is rectangular in shape
paratus';
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,
and of substantial thickness to provide a weight'
sumcient to exert the necessary downward force
lapping member ifi moves on the lower lapping
member, it will move relative to the work 30 and
during the lapping operation. The lapping mem
when moved far enough, the retaining rim 2l
are provided in the upper lapping member, one
adjacent each corner thereof, the lower ends oi’
to move downwardly while maintaining its paral
lel relation to the member I0. As the studs 20
thereon will engage the work 30 and move it rel
ber Id has a nat lapping surface I5 provided with
ative to the lower member l0. At the same time,
parallel longitudinal and lateral scoring I6
the contacting surfaces of the studs,2|l will wear
therein. A plurality of threaded apertures Il 45 away
evenly and permit the lapping member I 4
which'are enlarged, as at I8, to receive cylin
are worn away and the part 30 moves relative to
drical supporting members or studs `2li of equal 50 lthe upper and lower members, the upper lap
hardness. 'I'he studs 20 tightly engage the walls
ping surface i5 will engage the high spots on .
of the apertures I8` and are adjustable therein
the upper surface and Vlap them away and the
and held in adjusted position by adjusting
screws 2| engaging the threaded apertures I‘I.
lower lapping surface II will lap away the high
spots on the underneath side of the part 30 with-l The studs 20 are adapted to project beyond the 55 out any undue pressure being exerted on the
lapping surface I5 and engage the surface II of
part 30. The lapping operation is continued until
the lower lapping member 10, thereby support
the part has been lapped to the required dimen
ing the-upper lapping member so that its lapping
sion. Thus, the lapping of the part 30 is accom
surface I5 is spaced a distance from the lower
plished with a pressure which is insuiiicient to
lapping surface Il equal to the length of the co cause deforming or flattening of said part dur-'
. 2,412,366
»ping surface of said stationary' lapping member '
during a lapping operation, and a plurality-’of
adjustablesupports capable of .being worn away
during the-lapping operation associated ywith the
ing the lapping thereof.. If desired, twojiorsmore
parts may be lapped simultaneously.
What is claimed is:
_
i
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1. A lapping apparatus comprising a stationary
lapping member, a movable lapping member, each
of said lapping members having a lapping surface
thereon, means for moving said movable lapping
(member in a plane/parallel to one of said lapping
-movable -lapping- member and engaging the lap- ' n -
ping surface) of the stationary lapping member
for providing a' predetermined varying spacing
between said members as said supports are worn
surfaces and means associated withone of said - '
members and 'engaging the other member for
separating said~ members ‘a predetermined dis
away.
,
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7. A lapping apparatus comprising astationary
lapping member, a movable lapping member, a] »
plurality of adjustable supports capable of being
dWorn away associated withV the movable lapping
vmember and engaging the stationary lapping
tance and gradually reducing the distance there
betweenas- the lapping operation proceeds.
2. A lapping apparatus comprising a stationary
lapping member, a movable lapping member, each 15 member for providing a-p'redetermined varying
_spacing between- said members as said supports
of said lapping members having a lapping sur
are w’orn away, and means mounted on said
movable lapping member for confining a work
piece within the lapping area of said movable
face thereon, means for moving said movable
lapping member in'a plane parallel to oneof
said lappingsurfaces means> associated with one
' of _said members and engaging thev other mem 20 lapping _member and for moving said work piece
ber for separating said members a predetermined
relative t0 said stationary member.
`
8. In a lapping apparatus having a lapping
distance and gradually reducing the distance
plate provided with a lapping surface; a lapping
therebetween as the lapping operation proceeds',
member movable on the lapping surface of the
and means associated with one of said lapping
members for confining a work piece within the 25 lapping plate during a lapping operation, a plu
i rality of adjustable supporting members capable
lapping'area of said lapping member and mov
of being worn away during the lapping operation
inar it relative to said other member.
`
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3. A lapping apparatus comprising a stationary
projecting from said lapping member to*` engage> '
the lapping surface of the lapping plate- and to
lapping member having a lapping surface, a,
movable lapping member having a lapping sur 30 provide a predetermined varying spacing between
said lapping member and said lapping plate as
face and being movable on the lapping surface of
the suppbrting members are worn away and
said stationary lapping member during a lapping
operation, and a plurality of supports capable _ `
means for adjusting the ‘position of said support-l ~
of ‘being worn away during the lapping operation
ing members.
'projecting from onepf said members and engag- -
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,
9. In a lapping ‘apparatus having a lapping
plate provided with a` lapping surface, a lapping
member movable on the lapping surfacev ofthe
lapping plate during a lapping operation, a plu
ing the lapping surface of the other member for
providinga predetermined varyingspacing be
tween said members as said supports'are worn
rality of adjustable supporting members capable
4. A lapping apparatus comprising a stationary 40 of being worn away during the lapping operation
away.
.
_
-lapping member having a lapping surface, a
movable lapping member having a lapping sur
projecting from said lapping member to engage .
face and being movable on the lapping surface of
provide a predetermined varying spacing between .
said stationary lapping member during a lapping
operation, a plurality of adjustable supports ca
pable of being worn away during the lapping
said lapping member and. saidlapping plate as'
the lapping surface of the lapping plate and to
the supporting members are worn away _means .
for adjusting the position of said supporting
members,`and a retaining: lmember associated
with said lapping membenfor confining a work
»piece within the lapping area of said lapping
operation projecting from one of said members
and engaging the lapping surface of the` other
member for providing a predetermined varying
spacing between said members as said supports
are worn away, and means for adjusting the
supporting members to initially space said lap
surface.
»
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10. In a lapping apparatus having a lapping
plate provided with a lapping surface,- a lapping
member movable on said lapping surface of said
ping members.
`
5. A lapping apparatus comprising a stationary , lapping plate during a lapping operation, and
lapping member having a lapping surface, a 55 a plurality of supporting members capable of
being worn away during the lapping operation
movable lapping member having a lapping sur
projecting from said lapping member to engage i ’
face and being movable on the lapping surface
of said stationary' lapping ,memberl during a Y
the lapping surface of said lapping plate and to
lapping operation, a plurality of adjustable sup
ports capable of being worn away during the lap
provide a predetermined varying spacing between
ping operation projecting from one of said mem
60 said lapping member and said lapping plate as
said supporting members are worn away.
1_1. In a lapping apparatus having a lapping
plate provided with a lapping surface, a lapping
spacing between said'members as said supports
member movable on said lapping surface of saidare worn away, means for adjusting the sup 65 lapping plate during a lapping operation, and
a plurality of adjustable supporting members ca
porting members to ñx the initial spacing between
pable of being worn away during the lapping op
said l'lapping members, and means mounted onone of said lapping members for conñning a work
eration projecting from the lapping member_,to_
engage the lapping surface of the lapping plate
piece within the lapping area of said member
and for moving said work piece relative to said 70 and to provide a predetermined varying spacing
other member.
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between said lapping member and said lapping
6. A lapping apparatus comprising a stationary '
plate as the supporting members are worn away
lapping member havin‘g av lapping surface, a
movable lapping member movable on said lap
bers and engaging the lapping surface of the other
member for providing a predetermined varying
Brannon) s'roiin
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