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av. 5, 1946‘
Filed Oct. 26, 1945
5 Sheets-Sheet 1
NOV. 5, 1946.
‘- 2,410,752
Filed Oct. 26, 1945
3 Sheets-Sheet 2 '
Nov; 5, 1946.
3 Sheets-Sheet 3
Filed 0012. 26, 1945
Patented Nov. 5, 1946
' 2,410,752
Gale Sells, Kenneth C. Johnson, and Lee Black,
Portland. Oregm, assignors to G. G. Campbell
and B. H. Stroback, doing business as Radio
Specialty Manni'acturingv Company, Ports
mouth, Oreg.
Application October 26, 1945, Serial No. 624,650
5 Claims. (Cl. 51-161)
This invention relates to lapping machines and
the locking nut 5'. Resting on the top of the ped
is particularly adapted for the lapping of radio
crystals, lenses and the like.
estal 3 is a lapping ring 6' held in-a-central‘ posi
tion by the shoulder T ‘forming part of the ped
The primary object of the invention is to move
the objects being lapped between two lapping sur
faces by a carrier sheet, said carrier sheet being
supported by a carrier ring or frame completely
around its outer periphery.
A further object of the invention is to place the
estal 3.
Located 120 degrees apart are revolving sup
ports 8, 9 and Hi, the support H) is rotated by a
motor HI through reduction gear assemblies l2
and I 3‘. Keyed to the gear Hi of the reduction
gear !3 is a verticalv shaft l5, which in turn is
keyed to the rotor head I6. The revolving sup
ports 8 and 9 are simply rotatably mounted upon
carrier sheet under a tension within a carrier
ring so that the carrier sheet will not buckle or
wrinkle while moving the objects to be lapped
between lapping surfaces.
A still further object of the invention is to pro
a suitable bearing support IT and are not neces
sarily driven by their supporting shafts.
Mounted on the upper surfaces of the supports
8, 9 and I0 are cranks l8, These cranks vform
part of a disk l9 which is mounted within the up
vide an eccentric movement of the objects being
lapped between two lapping surfaces, this move
ment being imparted to the carrier sheet by its
wardly extending boss 20, by revolving the disk I9
holding frame, which in turn is moved and sup
within the boss 20 the throw of the crank i 8 can
ported upon driving units, the lapping surfaces
be changed, the object of which ‘will be described
remaining relatively stationary on either side of 20 later.
the carrier sheet while the crystals or objects are
Mounted to the cranks i8 is a supporting unit
being lapped.
or ring 2 l. The ring 2| has outwardly extending
Another object of the invention is to provide
‘bracket arms 22 which are mounted to the cranks
means for controlling the amount of eccentric
l8‘ by suitable bearings 23. The ring assembly 2 l
movement imparted to the carrier sheet, thereby 25 is caused to move in an eccentric movement by
controlling the movement of the crystals or ob
the rotation of the supporting units 8, 9 andv ill,
jects being lapped, which determines their ?nal
the unit I!) driving the whole assembly, the pur
?nished shape or contour.
These and other incidental objects will be ap
parent in the drawings, speci?cations and claims.
Referring to the drawings:
Figure 1 is a plan view of our new and improved
lapping machine for crystals, lenses and the like,
parts broken away for convenience of illustra
Figure 2 is a detail fragmentary sectional view
of parts of the device, taken on line 2--2 of Fig
ure 1.
pose of which willbe later described.
We will now describe the carrier assembly A’
illustrated in Figures 2, 6 and 7, this assembly
consists of a ring 24, having a'ledge 25 formedon
its upper side. Stretched under this ledge and
completely around the ring is a carrier sheet 26
or disk which is usually but not necessarily made
transparent and may vary in thickness depend
ing upon the work to be performed.
Referring to Figure '7 the carrier unit A is ase
sembled by inverting the ring 24, then dropping
Figure 3 is a side sectional view taken on line
the carrier sheet 26 down on-the ledge 25, then
3—3 of Figure 1.
40 the gasket 21, and tensioning ring assembly His‘
Figure 4 is a irontview of the lapping machine,
next put in place. The locking and tension as
taken on line ll—i of Figure 1.
sembly consists of va ring 28, having thread seg
Figure 5 is a plan view of the carrier frame
ments ~29 spaced ‘about its periphery for engaging‘
supporting unit which supports the carrier ring
the thread segments 3% formed within the ring 24.
and at the same time moving the carrier ring in 45 By forming the threads 29»and 3B in segments
the lapping operation.
the locking ring 28 may be brought into engage
Figure 6 is an inverted planview of the carrier
ment with the ring '25 instantly, then given- a
ring or frame, parts broken away for convenience
partial turn tightening down against the gasket
of illustration.
and carrier disk.
Figure 7 is an exploded view of the carrier ring, 50
The Carrier is further placed under a tension
carrier sheet and its associated parts,
by the ?oating ring 35, which has a groove 32
Figure 8 is a fragmentary plan view of one of
into which the ring 28 nests. The ring 3i is
the eccentric supports for supporting the unit
drawn up against the carrier sheet 26 at 33 by
illustrated in Figure 5.
the bolts 34 which are threaded within the ring
In the drawings:
55 28' and‘ have springs 35 under their'heads and
Our new and improved lapping machine con
bearing against the ring 3!, causing a continuous _
sists of a base i having a hollow pedestal 2.
tension between the two rings Hand '3! at the
extending upwardly therefrom. Threadably
same time .causing'the upper part of the ring 3!
mounted within‘thepedestal 2 is a movable ped
at 33 to bind against the :carrier: sheet: 26, cause
estal: 31which can be. adjusted up and down on its 60 ing the sameto be stretched throughout itsentire '
threads 4 and locked ‘in any desired position by
area. The action’ of the springs as stated above
provide a continuous tension, which is self-adjust
ing. This is one of the main features of our lap
ping machine, which will be more fully described
The ring 3| has a ?ange 36 which rides on
the rollers 31, said rollers forming part of the
supporting ring 2| thereby supporting the car
rier unit A within the supporting ring 2|, the
carrier unit A is centralized within the support
ing ring 2| by the horizontal rollers 38, which 10
are also journalled to the carrier unit or ring.
These rollers bear aaginst the shoulder 39 of the _
ring 3| of the carrier unit centralizing the carrier.
After the carrier unit has been put in place upon
work its way completely over the surfaces of the
lapping rings' toward the outer edge of the as
sembly. The lapping material is prevented from
?owing over the edge of the carrier unit A by the
ledge 25 of the ring 24, thus providing a pool of
lapping material over the upper surface of the
carrier sheet 26, thereby requiring a minimum of
In the eccentric movement of the carrier ring
and due to the fact that the carrier ring ?oats
within the supporting ring 2|, a most desirable
result is obtained and further this result is im
proved due to the fact that the lapping ring 42
is imparted a desirable rotary movement about
the rollers 31 and between the rollers 38 of the 15 the post 43, while the carrier sheet is being moved
thereunder by the freedom of movement of the
supporting unit 2|, the crystals 40 are dropped
carrier unit A and the lapping ring to move rela
into the openings 4| of the sheet 26 after which
tive to the driving or supporting unit 2| the
the lapping ring 42 is placed directly over the
chances of the units being lapped of following
lapping ring 6 and held in place by the guide
post 43, which drops into the opening 44 of the 20 the same route in their movement over the sur
lapping-ring 42. The guide post 43 forms part
ofthe bracket arm 45, which is rotatably mounted
to the pedestal 46, resting on the supporting
shoulder 41 and being held in proper alignment
with the lapping rings'by the latch 48, which
drops-into a suitable notch 49 of the shoulder 41.
The latch 48 is pivotally mounted at 5|! to the
arm 45 and has an operating arm 5| for moving
face of the lapping rings is reduced and a more
uniform lapping is the result.
We do not wish to be limited to the speci?c
form of mechanical embodiment as we have
shown, as other mechanical equivalents may be
substituted still coming within the scope of ou
We claim:
1. A lapping machine including a base, upper
the same. A special lapping compound container
52 is mounted by a suitable-holding bracket 53 30 and lower lapping rings mounted in substantially
?xed‘ relation on the base, rotating supports on
directly above the post 43 and has a control valve
the base, a supporting ring underlying the lap
ping rings and driven'eccentrically by the sup
ports, a tension ring connected to the support
We will now describe the operation of our lap 35 ing ring, a carrier sheet formed with openings
and extending beyond the lapping rings, the ex
pingrmachine, after the carrier unit has been
tended portions of the carrier sheet being secured
placed upon the supporting ring 2|, as heretofore
between the supporting ring and tension ring,
described, and the objects to be lapped are 10
a ?oating ring carried by the tension ring and
catcd within the openings 4| of, the carrier sheet,
and resting upon the upper surface of the lapping 40 bearing beneath the carrier sheet between the
lapping rings and the edge support/of the car
ring Send the lapping ring 42 has been brought
rier sheet, said tension ring bearing beneath the
into position, the motor or driving unit II is
carrier sheet adjacent the edge support thereof
started rotating the supportingunits 8, 9 and I0,
and adjustable to exert an upward pressure upon
causing their cranks Hi to move the supporting
the carrier sheet throughout the full circum
ring 2| in an eccentric movement thereby moving
ferential length thereof, to maintain a stretch
the carrier sheet 26 and the objects 40 to be lapped
ing tension on the carrier sheet when being moved
in an eccentric movement between the lapping
between the lapping rings during the lapping
rings 6 and 42.
Q ~
operation, and means for imparting motion to
, In order to employ-the principle of moving the
one of the supports to compel a gyratory move
carrier sheet between the lapping rings, which are
ment of the carrier sheet and elements secured
stationary; this carrier sheet must be stretched
in the holes therein relative to the lapping rings.
tightly within the carrier ring at all times in order
2. A construction as de?ned in claim 1, wherein
to prevent buckling of the sheet, therefore we
the supporting ring and tension ring for gripping
must employ an automatic tension means to
54 for allowing the lapping ?uid to drop down
glérough the post 43 and on to the carrier sheet
maintain a tension, or stretch throughout the '
the carrier sheet are mounted for threaded coop
carrier sheet, the method of accomplishing this
eration and adjustable in that clamping cooper
we have described above, but we do not wish to
3. A construction as de?ned in claim 1, wherein
the ?oating ring is guided on the tension ring
be limited to the above method, as-it is the object
of our invention to provide a means of maintain
ing this tension or stretch at all times to the 60 and wherein a spring is providedfor permitting
a yielding of the ?oating ring relative to the ten
carrier sheet and supportingthe carrier sheet
completely around its periphery and as stated
sioning ring to maintain a uniform stretch on
before this is the primary object of our invention.
the carrier sheet.
The amount ofveccentric movement imparted
to-thecarrier sheet 26 may be adjusted by the re-‘
setting of the position of the cranks I 8 by the means
above‘ described, wherein the disks l9 are re
volved within the bosses 20, their location being
_adjusted by- a suitable scale 55, which insures
the proper adjustment of all or the cranks.
In having a carrier sheet with no openings, ex
4. A construction as'defined in claim 1, wherein
the ?oating ring is provided with a ?ange'and
wherein the supporting ring is provided with
rollers to underlie such ?ange for the support
of the ?oating ring.
5. A construction as de?ned in claim 1, wherein
means are provided for adjusting the gyratory
play of the carrier sheet.
cept where the openings 4| occur, considerably
less lapping material is required due to the fact
that'said lapping material does'not escape down.
through the center of the machine, buthas" ‘to 75
1 .‘ _'
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