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Патент USA US2390914

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Dec. 11, 1945. I
2,390,914 '
Filed June 20, 1944
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?aivaz’are .Dfarrera
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Patented Dec. 11, 1945
2,390,914 '
Salvatore Barrera, Brooklyn, N. Y.
Application June 20, 1944, Serial No. 541,203
6 Claims.
(01. 82—11)
This invention relates to radii tool holders for
machine tools such as lathes, planers and the
like, and more particularly to a radii dresser.
An object of the present invention is to provide
a radii dresser capable of adjustment with great
re?nement and precision.
A further object of the invention is to provide
which it is rigidly mounted in those two perpen
dicular directions in such varying proportions as
to cause the said cutting tool to transcribe an
arcuate orbit. Various mechanical devices may
be utilized to produce the movement indicated
and the structure illustrated on the drawing
forming a part of this speci?cation is believed to
a tool of the character indicated of a construc
be a highly e?icient embodiment of suitable me
tion providing great rigidity and stability for the
chanical means for carrying into effect the above
tool proper.
10 indicated object.
A further object of the invention is to provide
Referring to the drawing, a standard base I
a tool of the character indicated of great sim
is utilized of conventional structure adapted to
plicity, involving a very few parts and those of - be secured rigidly to the bed or tool carriage of
simple construction lending themselves to great
the lathe, planer, or other machine tool with
e?iciency and economy in both manufacture and 15 which the device is to be used, and upon the top
face of this base member I is secured a circular
A further object of the invention is to provide
disk 2 as by means of screws 4. The disk 2 is pro
a tool of the character of unusual versatility,
vided with a diametrically disposed slot 3 prefer
‘inasmuch as it lends itself to ‘use for the cutting
ably of dovetail cross-section as'here'in illustrated
or dressing of both convex and concave surfaces 20 and the peripheral edge 5 of the disk 2 is beveled
by means of the very simple adjustment of its
in an outwardly and upwardly inclined direction.
Rotatably mounted upon the disk 2 is a ring 6_
Further objects and advantages will more par
having its inner peripheral surface similarly bev
ticularly appear in the course of the following
eled to seat on the beveled edge of the disk 2 and
25 having its outer peripheral edge provided with
‘The invention consists in the novel construc
worm gear teeth 1 adapted to be engaged by a
tion, arrangement and combinations of parts
worm 8 formed on a shaft 9 supported in bear
hereinafter more particularly described and
ings Ice-l0 mounted upon the base I. The shaft
detailed description.
One sheet of drawings accompanies this speci
?cation as part thereof, in which like reference
characters indicate like parts throughout.
Figure 1 is a plan View of the improved tool;
Figure 2 is a side elevation;
9 is provided adjacent each end with cross pins
ll adapted to engage a slotted sleeve I2 formed
as a hub 0n the hand wheel l3 which may be
’ provided if desired with a handle H by means of
which the worm 8 can be rotated selectively from
either side of the device.
Figure 3 is a vertical transverse cross-section 35
Seated upon the upper face of the ring 6 is a
second ring I4, the inner peripheral surface of
which is beveled in an opposite direction to that
taken on line 4—4 of Figure 1;
of the ring 6 as at 15. The ring [4 is provided
' Figure 5 is an exploded perspective view illus
on opposite sides with parallel slots iii-46
trating the slidably adjustable parts and inter 40 through which extend screws "-41 which are
locking key member for providing the limited
secured in the ring 6. To assure the utmost pre
movement of the tool carrier to perpendicular
cision in the adjustment of the rings 6 and 14, the
taken on line 3-3 of Figure 1;
Figure 4 is a vertical longitudinal cross-section
directions only;
slots l6 may be enlarged adjacent the adjoining
Figure 6 is a fragmentary vertical cross-section
surfaces of the rings 6 and M as indicated at 30
45 to receive an elongated slide member I8 through
taken on line 6—6 of Figure 1; and
Figures 7 and 8 are diagrammatic ?gures illus
which the screws I‘! are passed.
trating the movement of the tool in the opposite
Mounted within the ring I4 is a second disk
maximum positions of adjustment.
The gist of the present invention is the pro- ‘
vision of a mechanical structure whereby a cut 50
ting tool can be so mounted with respect to a
?xed base as to assure the restriction of its move
l9 having a beveled circular peripheral edge 20
forming a bearing for the ring M. The disk I9
is formed with a diametrically disposed slot 2|
in its lower face, which slot is preferably as herein
illustrated also of dovetail cross-section corre
sponding to the slot 3 in the ?xed disk 2.
A key member 22 is provided having oppositely
ment to two perpendicular directions in associa~
tion with operation means adapted to transmit
motion to the cutting tool and the parts upon 55 disposed dovetailed key portions 23, 24, which
said dovetail key portions are arranged perpen
dicular with respect to each other.
Referring to Figure 5, it will be noted that the
dovetail key portion 24 of the key member 22 is
adapted to slidably seat in the dovetail slot 3 of
the ?xed disk 2, while the dovetail key portion
23 is adapted to slidably seat in the dovtail slot
2| of the sliding disk member l9 by reason of
tion, the drawing herein illustrates a practical
and efficient embodiment of the invention, but
various mechanical expedients and modi?cations
of structure will readily suggest themselves to
those skilled in the art to produce the orbit or
movement of the tool 29 within the’ scope of
the present invention, as claimed.
Having thus described my invention, I claim:
1. Radii dresser comprising a base, a circular
which connection it will be observed that while
the ?rst disk member 2 is held rigid by means 10 bearing member ?xed with respect to the ‘base, a
rotatable member mounted to rotate with respect
of its ?xed connection to the base I the upper
to the ?xed circular bearing, a part slidable and
disk I9 is slidable in perpendicular directions with
adjustable with respect to the rotatable member
respect to the disk 2, but is held in nonrotatable
on a plane transverse the axis of the rotatable
relationship to said disk.
The disk l9 has secured upon its upper face a 15 member, said adjustable part formed with a cir
plate 25 as by means of screws 26 and the plate
25 is formed with a tool holder lug 21 adapted
to receive a cutting tool 29 which is held in fixed
relationship to holder lug 21' as by set screw 28,
cular bearing, a tool carrying part having a cir
cular bearing connecting with the circular bear
ing of the adjustable part, the ?xed circular
bearing member and tool carrying member each
the tool projecting beyond the rings 6 and it 20 provided on their confronting faces with perpen
dicularly disposed slots, and a key member
and also beyond the worm gear portion 1 formed
formed with portions adapted to seat in each of
on ring‘G.
While thepartslQ, 25 and 21 are herein de
2. Radii dresser comprising a, base, a circular
scribed as separate elements, these three portions
member ?xed with respect to the base, a
constitute in fact ‘the tool holder proper and the
rotatable member mounted to rotate with respect
term tool holder as used inv the claims herein is
to the ?xed circular bearing, a part slidable and
intended to cover the parts‘ I9, 25 and 21 or their
adjustable with respect to the rotatablelmember
equivalents, whether formed as‘ separate portions
said slots.
secured together or as a unitary part.
on a plane transverse the ‘axis of the rotatable
To adjust ring I4‘with respect to ‘ring 6, ring 6 30 member, said adjustable part formed ‘with a cir
cular bearing, a- tool carrying part having a cir
may be provided with an outwardly projecting
cular bearing connecting withthe circular bear
lug 32 having upstanding spaced'?ngers 33 be
ing of the adjustable part, the fixed ‘circular
tween which is positioned a thumb nut 34
bearing member and tool carrying member each
threaded on a screw 35 having its head 36 rotat
provided on their confronting ‘faces with perpene
ably secured in ring 14.’ Scales 3| can be marked
dicularly disposed slots, said slots intersecting at
upon adjacent portions of rings 6 and I4 toin
the center of the circular bearing member, and
dicate the maximum adjustment of ring I 4 to
a key member formed-‘with portions adapted-to
produce either a concave or convex orbit for
tool 29.
seat in each of said slots.
. .
The operation of the device is diagrammatical~ 40 3. Radii-dresser comprising a base, a part ?xed
with respect to the base having a peripheral cir
ly illustrated‘in Figures 7 and 8. Referring to
cular bearing face, a ring rotatably mounted .on
Figure 7, the center marked at indicates the cen
said ?xed part, means for rotating the ring with
ter of rotation of the ring 6, which ring 6 being
respect to the base, a second ring adjustably
rotatably mounted on the ?xed disk 2 always
rotates on this center at. The center marked 0 Y mounted on the ?rst ring, a tool carrier having
a circular peripheral bearing surface adapted to
is the center of disk 19 and ring I4 in the maxi
seat in said second ring and means connecting
mum adjustment of ring M in the direction of
the base and tool carrier restricting the ‘latter
the tool holder 21 or to the left as illustrated in
movement in perpendicular directions only. i
Figure 2. With ring l4 adjusted to the maximum
' 4. Radii dresser comprising a base, a disk hav
extent to the left as permitted by slots l6, rota
ing a beveled peripheral bearing face secured to
tion of ring 6 by means of worm 8 and handle
the base, a ring having an internal beveled face
H will cause the ring 14 to rotate vas an eccen
adapted to seat‘ on said disk and teeth on its outer
tric and impart motion to the tool holder disk
l9 (and its other associated parts 25 and 21) in 55 face, a second ring having an oppositely beveled
inner face, means for adjusting the second ring
perpendicular directions in different proportions
diametrically of the ?rst, a tool carrier disk having
successively to cause the tool 29 to transcribean
a beveled peripheral face adapted to seat within
arcuate orbit shown in dotted lines at G or a
the second ring, the ?xed disk and tool carrier
groove. The radius of the groove G is exactly
disk having dovetail grooves respectively on their
the same as the distance to which the center 0 is
adjacent faces, ‘ said grooves arranged perpen
shifted with respect to the center x. In Figure 8
dicularly, a key member having perpendicularly
is illustrated the movement‘ of ring [4 with re
dovetail parts adapted to seat, in said
spect to disk 6 where the center 0 of ring i4 is
a worm mounted 'on.
adjusted a maximum amount away from tool
the base to engage and rotate the rings in unison
holder 21 or to the right in Figure 2, in which 65
as an eccentric.
adjustment it will be noted that the tool 29 will
5. ‘Radii dresser comprising two rings super
transcribe an arcuate orbit B or‘ a bead, the
posed and adjustably connected to comprise ‘an
radius of which bead will'ccnrorm exactly with
eccentric, a ?xed circular base for ‘one of saidv
the distance to which the point 0 is adjusted
and. a circular‘member embraced by the
with respect to the center 2:. Where the ring Mv 70 'rings
other of said rings, the confronting faces of said‘
is adjusted with respect to ring 6 so that the
base and circular member formed with ,perpenv
center 0 coincides with thecenter :r, the tool 25
dicularly disposed slots, a key member having,
will have no movement whatever, so that the
portions slidable in said slots respectively wherecapacity of a particular tool is determined by
by the circular member is restricted to movement.
the adjustment permitted through slots it.
75 in perpendicular directions only, a tool carrier
As indicated at the beginning of this speci?ca—
mounted on said circular member and means for
members journaled upon the ?xed member and
rotating the ring members in unison.
6. Radii dresser comprising in combination a
?xed member and a tool carrier, each of said
members having a slideway, said members ar
ranged with the slideway in one perpendicular to
the slideway in the other, a key member having
portions slidable in each of said slideways, ring
tool carrier respectively with parallel axes, means
for adjustably displacing the axes of said ring
- members in their plane of rotation, whereby said
rings constitute an adjustable eccentric to modify
the radius of the orbit transcribed by the too]
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