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Патент USA US2404866

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July 30, 1946.
‘J. E. SHEUMAN
FLOATING FPO-CL HOLDER
Filed Oct. 5. 1944
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2,404,866
Patented July 30, 1946
2,404,866
UNITED‘ STATES PATENT ‘OFFICE
2,404,866
FLOATING TOOLHOLDER
James E. Sheuman, Waynesboro, Pa.
Application October 3, 1944, Serial No. 557,009
5 Claims.
1
This invention relates to tool holders, and
more particularly to ?oating tool holders for
use with turret lathes, screw threading ma
chines, drill presses, boring mills and the like,
(Cl. 279-16)
2
misalignment and the ?at disc likewise compen
sates for parallel misalignment.
Further objects and advantages of my inven
tion will be apparent from the following speci?ca
tion taken in conjunction with the accompanying
automatic or otherwise, in which it is desired to
have the cutting tool follow the work and com
drawing, wherein:
pensate for a spindle out of alignment due to
Figure 1 is a longitudinal section illustrating
wear of bearings or errors in the tool shanks, and
one application of the invention;
regardless of whether the tool is used in Vertical,
Fig. 2, a. longitudinal section illustrating a fur~
horizontal, or other positions, in order that ac 10 ther application of the invention;
curate cutting operations may be accomplished
by the tools.
The invention is an improvement over the con
structions disclosed in my prior patents, No.
Fig. 3, a perspective of the driving pin;
Fig. 4, an end elevation of said pin; and
Fig. 5, a side elevation of a conical'disc or
washer used in the structure of Fig. 1.
1,244,648, granted October 30, 1917, and No. 15 Referring to the drawing, the ?oating tool
1,450,822, granted April 3, 1923.
holder may be the straight shank type, as shown in
In the ?rst of these patents the pin through
Fig. 1, or of the shouldered type, as shown in
which one member is driven from the other en
Fig. 2. The straight shank type of holder mini
gages only one of the diametrically opposed walls
mizes over-hang of the tools, it allows unob
of the bushing due to the shifting of the shank 20 structed penetration of a turret, and is especially
eccentrically of the bushing or driving member,
effective on machines where forward movement of
and this produces undue wear. In the latter
the carriage is constant in all positions of a
patent while the structure is improved, neverthe
turret. The absence of shoulders allows closer
less due to the fact that the driving pin is angular
grouping of the spindles on multiple spindle ma
at the point of contact there is not the broad, 25 chines, while a shouldered shank holder is
solid, driving engagement desired. Also, there
adapted for heavier work.
are other features which the present invention
As shown in Fig. 1, an outer bushing or driving
seeks to improve.
member l0 has ?tted loosely therein an inner
It is an object of the invention to provide two
shank or driven member I l , there being a limited
types of ?oating tool holders which permit the 30 play or relative movement between the two parts
wide use of standard tools, one type having a
in order that the tool carried by the driven
straight shank holder without shoulders, and
member Il may be centered during the cutting
the other type having a shouldered holder for
operation when it is in contact with the work.
heavier work.
‘
In order to provide for the end thrust between
A further object of the invention is to provide 35 the driving and driven members, as well as to
a ?oating tool holder which will allow sufficient
reduce friction to allow the driven member to
move relative to the driving member for the
movement to compensate for inequalities, or de
?ciencies of alignment as well as one of simple,
centering effect, a ball bearing I2 is provided
durable, eilicient and more satisfactory in con~
between the ends of the driving and driven mem
struction.
.
Another object of the invention is to provide
in a ?oating tool holder a drive between the
shank and the bushing which consists of a. driv
40 bers, a ?at washer l3 being disposed against the
bottom of the socket in the outer driving mem
her so that the ball bearing rolls against it. On
the opposite side of the ball bearing is a washer
M having a conical face on one side in engage
ing pin with eccentric end portions which are 45
ment with the bearing and a ?at face on its
relatively broad for solid contact with the open
other side whic his engaged by the ?at end of
ings with which the eccentric portions of the pin
the inner shank or driven member I l. Thus the
engage in the bushing, the pin having a rotating
axial pressure or thrust between the driving
instead of a sliding action, and also contacting
member and the driven member will be taken up
the driving member the width of the wall instead
5,0 by the parts just described.
of having a mere angular contact therewith.
In order to provide the necessary connection
A further object of the invention is to provide
between the driving and the driven members, so
a ?oating tool holder with friction minimized in
that the driven member will be caused to rotate
which the rolling or swivelling action of the con
with the driving member, the transverse opening
ical disc over the balls compensates for angular . 55
. I5 is provided in the driven member and a cor
2,404,866
3
It will be ‘obvious to those skilled in the art
that various changes may be made in the in
vention without departing from the spirit and
driving pin I‘! with eccentric end portions 13,
scope thereof and therefore the invention is not
providing an improved driving connection be
limited by that which is shown in the drawing
tween the driving and driven members and af
and described in the speci?cation but only as
fording a broad, solid, contact between the pin
indicated in the appended claims.
and the openings [6 in the bushing. The pin is
What is claimed is:
adapted to rotate instead of slide as in my previ
l. A too1 holder comprising a bushing, a tool
ous constructions, and also, there is contact be
tween thepin and the bushing or driving mem 10 carrying member having a shank ?tting loosely
responding pair of openings It in the driving
member. In these openings there is disposed a
therein, said bushing and tool carrying member
having registering transverse apertures, a pin
ber the thickness of the wall instead of a mere
angular or line contact.
having an intermediate portion and one or more
The driving pin I1 is provided with a slot IQ
eccentric end portions which portions are adapted
for the reception of a set screw disposed at right
angles to the driving pin for limiting its axial .15 to have arelatively large surface engagement with
or endwise movement.
said registering apertures, said pin being adapted
Thus with the structure described and ‘illus
trated in Fig. 1, angular misalignment is accom
to rotate and maintain a driving connection be
conical disc l4 over the'balls, allowing the shank
ing a curved surface to the bearing, said curved
tween said bushing and said tool carrying mem
ber, a thrust bearing between said bushing and
modated. The arrangement of parts simpli?es
the proper alignment of the tool carried by the 20 tool carrying member, a Washer on each side of
said bearing, one of said washers presenting a
shank ll. Angular misalignment is accommo
flat surface to the bearing and the other present
dated by the rolling or swivelling action of the
and ?at surfaces permitting rolling and swivelling
to tilt easily. Likewise, parallel misalignment
or lateral movement of the shank is easily ac 25 action of the tool carrying member in said bush
ing, the eccentric portions of said pin and the
commodated by the ball bearing moving on the
walls de?ning the openings in the bushing pro
adjacent surface of the disc l3. The washer it
viding relative large contact between the pin and
has ?at sides. A positive drive is maintained
the bushing.
between the shank and the bushing by the driv
2. A tool holder‘comprising a bushing, a tool
ing pin and its eccentric relatively broad flat end 30
portions, the pin rotating to maintain such posi
carrying member having a shank ?tting loosely
tive connection.
The construction shown in Fig. 1 is a straight
in said bushing to allow the tool to swivel or move
laterally to align with work, said bushing and tool
carrying member having registering transverse
construction shown in Fig. 2 is a shoulder type 35 apertures, a driving pin located in said apertures
shankholder for tapered shank tools, while the
and having one or more eccentric end portions
,
offset with respect to each other for engagement
Referring to Fig. 2, an outer bushing or driv
with the corresponding surfaces of said register
ing member l0’ has loosely ?tted therein an inner
ing apertures, a thrust bearing between said bush
shank or driven member I l’. The relative move
ment or play between the outer bushing or driven 40 ing and tool carrying member serving to mount
said tool carrying member in said bushing, and
member and the inner shank permits the tool
surfaces in association with said bushing and said
carried by the inner shank to center or align
holder for tapered shank tools.
tool carrying member presented to said bearing to
allow the tool carrying member to freely swivel
with the work during the cutting operation while
it is in contact with the work. The drive be
tween the outer bushingand the inner shank is
identical to that of the structure of Fig. 1, the
and move laterally for alignment of the tool with
work.
'
3. In combination with a bushing of a shank
mounted for movement in said bushing so that
a tool held by the shank may follow the move
with an enlargedhead 20 and the inner shank 50 ment of work, an annular bearing for receiving
the end thrust of said shank in said bushing, and
is provided with an enlarged head 2|. The en
said shank presenting a curved surface to said
larged head 20 is adapted to receive an assembly
outer bushing having aligned apertures 46’ to
accommodate the eccentric portions l5 of the
driving pin ll. The outer bushing It’ is provided
bearing to facilitate swiveling of the shank, said
for performing the functions of the assembly be
bushing and shank having registering transverse
tween the end of the shank and the bushing in
Fig. 1 such assembly comprising a ?at washer 55 apertures with relatively large surface areas, a
driving pin located in said apertures and having
l3’ and a conical washer 22. Thus the bearings
relatively large surface areas for engagement with
and the flat conical washers of the constructions
said apertures, one or more of the end portions of
of both Figs. 1 and 2 compensate for angular and
said driving pin being disposed eccentrically of
parallel misalignment. Angular misalignment is
corrected by the action of the conical disc rolling 60 the intermediate portion thereof.
4. In combination a bushing, a tool holder hav
or swivelling over the ball bearings, thus keeping
ing a shank loosely mounted in said bushing to
the shank or socket parallel to the ?at or front
allow a tool to align with the work, said bushing
face of the disc or washer at all times. Paralleled
and shank having transverse apertures, a driving
misalignment is corrected by lateral movement
of the shank which readily'follows on account 65 pin located in said apertures and having a por
tion offset from another portion of said pin, a
of the bearing rolling over the ?at face of the
friction reducing roller thrust bearing between
?at washer l3’. At the same time the driving
said bushing and said tool holder, and surfaces
pin will rotate and maintain the driving connec
in association with said bushing-and too1 carrying
tion. The washer 24 is fastened to the shank or
driven member H’ for the purpose of holding 70 member presented to said bearing to .allow the
tool carrying member to freely move for ,align
the tool in place when withdrawing the tool
ment of the tool with the work, said surfaces
from the work.
being ?at at one side and arched at the other
From the foregoing it will be readily under
side of the bearing.
,
_
stood that a, simple yet improved construction
is provided.
75
5. In combination a bushing, a tool holder hav
2,404, 866
5
ing a shank loosely mounted in said bushing to
allow a tool held by said holder to align with the
work, said bushing and shank having transverse
apertures, a driving pin located in said apertures
ing and said tool holder, and surfaces in associ
ation with said bushing and tool carrying member
presented to said bearing to allow the tool carry
ing member to freely move for alignment of the
and having a portion offset from another portion
tool with the work.
6
of said pin, a thrust bearing between said bush
JAMES E. SHEUMAN.
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