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Патент USA US2122056

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June 28, 1938.
'
R. s. DUKE
2,122,056
LAP RETRUING'MAGHINE
Filed July 6, 1936
3 Sheets-Sheet 2
Juhe 28, 1938.
R, a DUKE '
2,122,056
LAP RETRUING" MACHINE
Filed July 6, 1936
'7.
3 Sheets-Sheet 3
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Patented June 28, 1938
2,122,056
UNITED STATES PATENT vOFFICE
2,122,056
LAP RETRUING MACHINE
’ Robert S. Duke, Houston, Tex.
Application July 6, 1936, Serial No. 89,033
'
5 Claims.
This invention relates to a'lap re-truing ma
chine.
It is an object of the invention to provide a
machine of the character described and specially
, '5 designed for reshaping the spherical or toric sur
face of the lap, such. as are used in lens ‘grind
ing and polishing machines.
.
.
In the manufacture of lenses, such as optical
lenses, a grinder is employed, one element of
m which comprises a lap having a grinding surface
which is of the curve of the desired surface of the
lens to be ground. As a result of use the active
surface of the lap,‘be it either convex or concave,
becomes misshapen from wear. It is an object of
if this invention to provide a re-truing machine
wherein the grinding lap may be restored to its
original curve or curves.
' It is another object of the invention to provide
a machine of the character described wherein the
120 misshapen lap may be mounted and which is
equipped with an abrasivesurface arranged to
.cooperatewith the lap and which is capable of the
required adjustments to restore the active ‘surface
of the lap to the original curve or curves, the
> . range of adjustment being such that a worn lap
of any original spherical or toric surface may be
restoredv for further use in lens grinding and
.
polishing.
.
With the above and other objects in view, the
30 invention has particular relation to certain novel
features of construction, operation and arrange
ment of parts, an example of which is given in
this speci?cation and illustrated in the accom
panying drawings, wherein:—
Ci 1.!
>
Figure 1 shows a side elevation of the lap re
truing machine partly in section.
.
Figure 2 shows a cross sectional view of the
stand taken on the line 2—2 of Figure l.
,
Figure 3 shows a side view partly in section,
4” taken at right angles to the view shown in Fig
'
ure 1.
Figure 4 shows a'plan view.
I
'
Figure 5 shows a cross‘ sectional View taken on
the line 5—5 of Figure 3.
45
'
,
Figure 6 shows a fragmentary side view partly
in section, showing a modi?ed form of the ma
chine, and
1
I
Figure 7 shows a fragmentary sectional view
taken at right angles to the form shown in Fig
50
ure 6.
I
a
,
Referring now more particularly to the draw
ings, wherein like numerals of referenceydesig
vnate same parts in each of the ?gures, the nu
meral ~l designates a suitable stand which is tu
55 bular in form and mounted on the base 2. Fitted
(01. 29_'1s)
within the upper end of the stand there is a chuck
3 which is splined therein against rotation by the
key 4. The upper end of this chuck extends
above the stand and is upwardly tapered and
blank as at 5 to ?t into the socket 6 of the lap Cl
6a to be ground. The tapering portion of the
chuck has a lateral key ‘I which is received in the
vkeyway 8 of the shank of the lap whereby the lap
is held against turning on the chuck. An inter
mediate portion 9 of the chuck is externally 10
threaded and an adjusting nut I0 is threaded
thereon and‘abuts the upper end of the stand
whereby the chuck and the lap thereon may be
vertically adjusted.
Vertically slidable on the support I there is
a clamp I l which is splined thereon by the spline
I2. The free ends of the clamp l'l have the out
wardly turned corresponding lugs l 3, l3. A clamp
screw I4 is ?tted through one of said lugs and
has a threaded connection with the other and
the outer end of this screw has the grips l5, 15
whereby the screw may be. turned to contract
or expand the clamp ll. Laterally offset from,
but rigidly secured to, said clamp there is the
upstanding arm l6 and mounted on the upper
end .of this arm to pivot on a horizontal axis is
the yoke IT. This yoke is mounted to pivot on
the spindle l8 which is secured to the arm I6.
One end of the yoke is formed into the counter~
weight l9 and secured to the other end of the
yoke thereis a vertical guide 29. slidable on said
guide and having a dovetailed connection there
with there is a wrist bearing 2| in right angular
relation to the axis of the spindle [8.
A screw shaft 22 is mounted to swivel in a ver
tical bearing 23 at the upper end of the guide
20 and this shaft 22 has a threaded connection
with the wrist bearing 2! whereby said bearing 2|
may be adjusted vertically. The guide 20 carries
a gauge 24 and the wrist bearing 2! is equipped 40
with a pointer 25 whereby the point of adjust
ment of the bearing 2| may be approximately as
certained. For ?ner, or more accurate, adjust
ments the upper end. of the bearing 23 is pro
vided with a gauge 26 and the adjacent portion
of the shaft 22 is provided with a mark 2'! to
indicate the adjustment of the shaft. The shaft
23 is equipped with a handle 28 whereby it may
be turned.
There is a crank arm 29 one end of which is 50
formed into a wrist 30 which works in the bear
ing 2|. The other end of this arm is arranged
opposite the arm l6 and has a sleeve 3! pro
vided to receive the lower end of the upstand
ing standard 32. The standard is secured in said 55
2
2,122,056
sleeve by means of suitable set screws 33. There
is a ?le holder 34, one end of which is formed
with a vertical bearing 35, preferably square
in cross sectional contour, and which is verti
of the adjusting nut lUa. This nut is retained
in the holder by means of the transverse pins
45 which are ?tted through the annular groove
46 around said shank. The chuck 3a is threaded
cally slidable on the standard 32. The ?le holder
through the nut Illa. and the lower end of this
may be secured at any point of adjustment on
chuck is tapered as at 5a to ?t in the socket of
the standard by means of the set screw 36 which
has a threaded connection with the wall of the
bearing 35 and whose inner end is adapted to
bear against said standard. The outer end of the
set screw 36 is equipped with a grip 3‘! whereby
said set screw may be turned. The other end of
the holder 34 is downwardly turned and pro
vided with a lengthwise groove forming a seat
15 38 wherein the ?le 39 may be seated and se
cured by set screws 4|] threaded through the wall
of said seat.
On the standard 32 thereis" argauger4l for
the lap 61). The tapering portion of the chuck Bot
has a lateral key ‘I which is received by the key
way 8 of the shank of the lap 6b whereby said
<lap=is~~held against turningon the chuck. The 10
lap. Bbhas a concave operative face 41.
In this form there is a fork 48 having a spindle
:48a which is keyed in the upper end of the stand
I, as shown in Figure 6, and mounted in the fork
there is a-?le, or other abrading member 39a. 15
This‘?le39a is of a general cylindrical contour
and it is provided with the end spindles‘ 49 which
are'mounted' to rotate in the bearings formed in
indicating the radius of the dioptriccurvature the .arms of the fork 48. These spindles are held
20 of the operative surface of the lap 6a and the‘ vagainst rotation by the set screws 53, 5B. The 20
‘bearing 35aha'sya :side window 42 which carries vsurface of the abrading member 39a has the
the’ transverse indicating line 43.
contour of a spherical segment and as the abrad
When'the surface of the lapbecomes misshapen ing surface becomes worn the member 39a may be
as aresult, of use'it maybe removedvfrom the .partiallyt-turnedifrom time to time by loosening
lens. grinding'machine and mounted on the chuck the ‘set screws 55!]. and upon‘ making the adjust 25
3 as-shown in Figures 1 and‘ 3. Before mounting ment again: tightening them. up».
the lap in place; however, the screw. I4 is loosened
The weight [9 hereinabove referred to has been
and the clamp: I I‘ elevated so as to move the holder
provided for'balancing‘ the‘ adjusting and grind
34 andi?le'sSQ elevated out of the‘way, and the .ing'mechanism, hereinabove described, about the
30 screw I4 maybe‘ then tightened to cause the
axis of the spindle I8.
30
clampv I lgto. grip the stand I so as to'hold the
" What ' I claim is:
parts in ‘elevated position. The‘ lap 8a may then
‘13A: machine of ' the character described com
“be-mounted in. place. 'The screw‘35 may then be .prising‘acstan'dpa yoke mounted on- the stand‘ to
released and the ?le holder 34 adjusted with re
pivot ona ‘horizontal axis, a standard, means for
35 spect to the gauge 4I’to give the desired radius supporting the standard to pivot about a hori 35
of :dioptric curvature, that is, the base curve and vzontal axis :onthe yoke, said supporting means
the screw ‘36 then tightened up to securely fasten being vertically adjustable, a- work holder on the
the ?le holder to the standard-32. '
stand, a ?leholderivertically. adjustable on the
‘ The wrist bearing. H is now adjusted inaccord
ance-With the particular contour desired for the
toric surface of the lap. If said-last mentioned
bearing be adjusted into a common horizontal
plane with the ‘bearing of theyoke IT and the
?le 39 be operated over the surface of the lap and
about said bearings, as axes, a segment of a
spherical surface will be produced on the lap. If
the vwristf bearing‘ 2! be adjusted'out of the hori
zontal plane of the-yoke bearing the surface pro
ducedbyithe ?le‘39-on the lap will be varied
from a‘truespherical segment and will approach
a cylindrical surface, the variation in the particu
lar form of the toric-suriace produced ‘depending
upon the relative adjustment of the‘ two axes.
The screw I4 is then loosened and the clamp l I
lowered until the ?le rests on the surface of the
lap to be operated upon. The set screw I4 is then
tightened up to cause the clamp to grip the stand.
As'will; be noted by-an inspection of Figures 1
and 3, a wide range of adjustments has been pro
60 vided for, to the end that any desired curvature
of the operative face of the lap 6a may be pro
duced. ' During the progress of the work the nut
III may be adjusted ‘from time to time, to hold
the‘ lap‘ closely to‘ the work. When the lap has
‘been ground to the desired contour'it may be
removed from the chuck ready for use in" the lens
grinder or polisher.
As shown the'operative face of the-‘lap 6a is
convex.
This will produce a concave face on the
lens- ground thereon. ‘If it be desired to produce
standard, .a ?le ‘on thei?le holder adapted to con
tact: the work, means for ?xing the ?le- holder at 40
any. point of adjustment onv the standard.
20A machinefofithe character described com
prising a stand, a vertically adjustable arm on
;the stand, means .for ‘?xing the arm at any
selected point of adjustment, a yoke mounted to 45
:pivot ona'horizontal axis on the arm, a vertical
..ly adjustable -_bearing on the yoke,-means'for
adjusting said bearing relative to said axis,v a
standard . support ‘having a wrist mounted to
pivot insaid bearing,v an upstanding standard on 50
saidsupport, a work holder on the standadapted
toreceive andssupport the work to be operated
on, ya ?lef holder,: means for ?xinglthei ?le holder
at any selected point of adjustment on‘ the stand
ard, :a "?le on the holder in contact with the 55
work.
'3.'IA‘grinding1machine comprising astand, a
yoke mounted‘on the stand to pivot on a hori
zontal axis, astandard, means for supporting the
standard‘ to pivot ‘about a horizontal axis on the 60
yoke, said supporting means being vertically ad
justable, a work holder on- the stand, a ?le holder
vertically-adjustable on the standard, a ?le on the
?le holder adapted to contact’the work, means
for» ?xing the ?le holder at» any point of adjust 65
mento-n the standard-and means for adjusting
the work on the stand.
4. A machine of the character’described com
prising a'stand', an- arm adjustable longitudinally
with respect to the stand, means for ?xing the 70
a convex face on‘the ‘lens, it is of course neces
armat anyselected point of adjustment, ‘a'yoke
sary'thatthe ‘operative face of the lap be con
'mounted-topivot on the arm on an axis at ap
cave as shown in Figure 6.
Aslshown in Figures-6 and '7 the-holder 34a is
proximately right angles to the axis of the stand,
a bearing on theyoke adjustable ‘at approximate
I provided with a socket 44 ‘to receive the shank
ly right anglesitol'the axis onlwhich the yoke
v
2,122,056
pivots, means for adjusting said bearing relative
to said last mentioned axis, a standard support
having a wrist mounted to pivot in said bearing,
an upstanding standard on the support, a work
holder on the stand adapted to receive and sup
port the workto be operated on, a ?le holder,
means for ?xing the ?le holder at any selected
point of adjustment on the standard and a ?le
on the holder in contact with the work.
10
5. A lap re-truing machine comprising a stand,
an arm adjustable longitudinally with respect to
3
on the yoke adjustable at approximately right
angles to the axis on which the yoke pivots, means
for adjusting said bearing relative to said last
mentioned axis, a standard support having a
wrist mounted to pivot in said bearing, an up
standing standard on said support, a work holder
adapted to' receive and support the work to be
operated on, a ?le holder and a ?le thereon, one
of said holders being located on the stand and
the other being located on the standard and' 10
means for ?xing one of said holders at a selected
the stand, means for securing the arm at a point of adjustment on its support with the ?le
selected point of adjustment, a yoke mounted to , in contact with the work.
pivot on the arm on an axis at approximately
15‘ right angles to the axis of the stand, a bearing
ROBERT S. DUKE.
15
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