close

Вход

Забыли?

вход по аккаунту

?

код для вставки
Dec. 3, 1946.
2,412,038
E. C. FREISEN
RETRACTABLE TYOOL HOLDING MEANS
ì
-Filed Aug. l2, 1944
T.
z
TH
lé
l
I
".5
t
Y(5a/6aéJ
4=
2‘/ L
Q
á a
‘\
d
we
k
K)
~N
I
i`
'n
'
®`
`
d
I
w
Q
><
i
Ñlä d
È
!
\\_ \
F
\
d /
ä
*
Vîwr `
'N
ä
N
f
)3'
"am
oI
"’
/È
Q
x
i
\
á
`
.
N
'Q
‘ï
N
u
'n
,l
>
`
vn;
9 I \
_Imi Y
¿aA.25
P, a6
`
m
l
ä
24/
_
»INVENTOIL
[PWA/P0 C fk5/55N
.BY
/
/I
v
ATTOENEY
2,412,038
Patented Dec. 3, 1946
-UNITED STATES PATENTQoFFicE i
RETRACTABIQE rrooL HoIQDiNG MEANS
Edward C. Freisen, Detroit, Mich., 'assigner to'
Ex-Cell-O Corporation, Detroit, Mich., 'a cor
poration of Michigan
Application August 12, 1944, Serial No. 549,261
7 Claims. (Cl. 77--3)
2
l
The present invention pertains to a retractable
tool holding means.
.
vThe principal object of my invention is to pro
vide a holder for a fly cutting boring tool con
structed and arranged'to place the tool alter
natively in two possible positions and to cause the
cutter thereof, when in a cutting position, to have
a predetermined radius of rotation and, when in
a non-cutting position, to have a lesser radius of
to by three equally spaced screws I6 insertable
through holes I6a. At the rear end of shaft I2 is
>fixed a spindle shaft driving member I8 which
may Well include V belt grooves adapted to be
driven from a conventional V belt pulley on a
suitable motor,f_not shown.` i
YWhile my retractable tool holding means may
be alternatively placed in its cutting or retracted
position u by any convenient mechanism either
rotation. rI‘he second or retracted radius of ro 10 manually or power actuated, IV shall here describe
an hydraulically actuated means which maybe'
tation may differ from the cutting radius by a
preferable when my invention is used in associ
minute distance, usually only _a fraction of one
ation with an hydraulically actuated machine.
thousandth of an inch or a few thousandths of
'an inch, to cause the point of the cutter to radially
Shaft I2 is hollow and surrounds a rod 20 ax
retract from or clear the finished surface of the 15 ially movable therein by its connection with pis.
ton 22 which is reciprocable in cylinder bore 23
bored workpiece so that, in the reverse axial move
formed in member I _8.A _The rearward face of pis
ment between the workpiece and the tool which
ton 22 is continuously in communication with
takes place during withdrawal of the tool (or the
work) following a boring operation, the point of
passage P1 formed in s_wivel connector member 24
the cutting tool cannot contact the finished bore 20 which isiiixed> to and rotatable with member I8,
to mar or scratch the latter.
the member 24 being rotatable in non-rotatable
Another object of my invention is to permit
connector member 2t.` Member 24 is formed with
a central axial bore which fittingly encirclesv a
the cutting tool to be shifted from one to another
reduced diameter. rear end portion of rod 20 con
of its two positions whether ornot the boring
tool is rotating and, in instances where it is more 25 taining passage Pz which communicates with the
forward face of piston` 22. Rod 20 may move axi
convenient to rotate thel workpiece than to ro
ally in member 24 with movement of piston y22 in
tate the tool, the tool may be' alternatively placed
its bore 23. Throughswivel connector member '
in a cutting or non-cutting position at will,
_24, passage P2 is in constant communication with
though the tool holder be non-rotatable.
AA structure including my improved tool hold 30 passage P3 and conduit Ci, also through this swivel
connection, conduit C1 is continuously maintained
ing means is clearly illustrated in the following
in communication with passages Pi'. Conduits Ci,
drawing in which;
C2 may be alternativelyconne'cted with a supply
jïFig. 1 is a longitudinal sectional View of a bor
of hydraulic iiuid under pressure P or with ex
ing spindle including a retractable tool holding
35 haust E ,through conventional two-Way valve YV
means embodying the features of myinvention.
i which may be actuated by handle CJ Piston 22
Fig.v 2 is a fragmentary cross sectional View in
may thus be caused to have iiuid under pressure
cluding my tool holding means drawn to larger
applied alternatively to either of its faces.
scale for clarity; and
' The forward end of rod 20 is formed with a
Fig. 3 is a sectional view through a bushing il
lustrative of one simple form of workpiece which 40 frustro-conical end 32 having its axis coinciding
with rod 20 and‘shaft I2. The frustro-’conical
may advantageously be bored by the embodiment
end of the rod is surrounded by an annular mem
of my invention herein illustrated.
Í
ber, 28 fixedly'pinned to the rod and axially re
Referring more particularly to the drawing, the
ciprocabl‘e therewith in a suitable enlarged guide
improved tool holding means may be incorporated
in Ía spindle 5 substantially of the structure de 45 bo're formed in the forward end of shaft I2.
The tool holding means TH, when a section
scribed in United States Patent No. 2,012,677,
on one side _of the axial centerline is considered,
issucdAugu-st 27, 1935, to Carroll R. Alden, and
is seen to be of U shaped jc’ross section support
including precision antifriction spindle bearings
ing a central hub portion H which,’at its forward
of the sort illustrated in method Patent 1,7 08,491,
50 end, is provided with an axial bore in which re
issued April 9, 1929, to the said Alden.
movable boring bars 6 of various selected lengths
The_spindle shaft I2 is supported for rotation
and heldas by set‘screws 601;l may support a tool T
in the structure 5 cn the bearings I4 and is formed
with its cutting point at a predetermined radial
at its forward end with a face plate member l2a'
distance from the axis of the boring' bar l6'._ ‘ " '
for rotatably supporting the retractable tool hold
The U- shaped cross section- of the holderTH
ing'means'TH which is preferably fastened there 55
2,412,038
3
4
between its supported surface abutting face plate
I2a and the hub portion H, especially the di
aphragm portion D, is deformable.
stantially normally thereto and spaced from said
When the rod 20 is withdrawn to its rearmost
position as shown in Fig. 2, the annular member
28 centralizes the rear portion of the hub mem
ber H and Lpreferably causes the `axes of boring
bar 6, tool holder TH, lrod 2U and shaft I2 all to
lie in a single straight line. Though any con
venient means may be used to move the rear
supported extremity thereof, a tool member car
ried by an extension of said hub on one side of
said deformable member, an opposing extension
of said hub on the other side of said member, and
means for laterally moving the extremity of said
opposing hub extension relative `to said principal
support to control the» deflection of said deform
able memberwhereby to displace the axis of said
10 hub.
most end of hub H, in the present instance rod20 is caused to have it forwardmost position, as
" 2. In a retractable tool holding means, a prin
cipal support member, a deformable member of
substantially circular disc shape fixed to said
shown in Fig. 1, upon appropriateA application of
hydraulic pressures on piston 22. Injthe illus
¿principal support member at a plurality of points
trated structure the .central recessed 'bore 28a 15 adjacent the periphery of said deformable member,
a hub member supported by said disc shaped de
then surrounds the acorn shaped rear end of hub
formable member substantially »centrally there
H with a suitable clearanCetherebetWeen. >The
of,` a tool member carried by an extension of said
rearrnost end of hub H is formed with an internal
frustro-conical surface 30 having the axis thereof
'hub member, an opposing extension of said hub
slightly eccentrically displaced from the axis of 20 member, and means for moving the extremity of
said opposing hub extension relative to said prin
hub H and boring bar 6 as illustrated to an exag
gerated scale'by the dimension 34. When the
cipal supportI member to control the deformation
of said deformable member whereby to displace
vconical `end 32 is forced into the conical recess
30, as shown in Fig. l, its eccentric axis is ele
the axis of said hub member.
vated into coincidence with the true axis of
3. In a reti'actable tool holding means, a hol
spindle I2 causing deformation of the diaphragm
low rotary machine spindle, a deformable mem
portion D which retracts the tool T fby shortening
ber substantially of circular disc shape fixed to>
lthe radial distance from the cutting point of tool
T to’V the true axis of rotation of shaft I2 thus
causing tool T to describe a-smaller circle of rev
olution than it describes »when the tool is in its
'non-retracted boring position, as shown in Fig. 2.
Because of the small magnitude of the change in
'radial distance of the tool T between its cutting
said machine spindle at a plurality of spaced
points adjacent the periphery of said member
l310
and with the central axis of said member gen
erally coincident with the axis of rotation of said
spindle, a hub member supported byk said de
formable member substantially centrally thereof,
a tool member carried by one end of said hub
4andits retracted position, the workpiece W of 35 member, and meansv for moving the opposite end
Fig».,3 has been fragmentarily shown in Fig, 2 in
of said hub member relative to the axis of said
relation to the tool T, and an exaggerated dimen
spindle to control the deformation of said de
sion 36 has been Vapplied between the ñnish bored
formable member whereby to alter the radial
internal diameter of the workpiece and the dot
distance from a point on said -tool member to theV
fted'line indicating the boundary line of tool ro y40 axis of said spindle.
tation
the retracted position. The axis of the
4. In a retractable tool holding means, a hol
hub I-I and boringbar-Iì being considered to pivot
low rotary _machine spindle, a deformable mem
over the point when the diaphragm D is reflected
by >placing the parts `in the position shown in
ber substantially of circular disc shape fixed to
said machine spindle at a, plurality of spaced
points adjacentthe periphery of said member
vand. with the central axis of said member gen
erally coincident with the axis of rotation of said
normalcutting radius of rotation when table 2
machine spindle, a hub member supported by
ismoving in its forward or feeding direction, it
said deformable member substantially centrally
is `sometimes preferable, especially ywhen my in
ventionis incorporated in an hydraulically actu 50 thereof, a tool member carried by _one end ofsaid
hub member, a member axiallymovable in said
ated machine, to omit the control valve >V and
hollow machine spindle, means _effective upon
connect the conduits C1, C2 with like hydraulic
conduits (not shown) which alternatively supply
axial movement of said last mentioned memberin
orV discharge 'Y fluid under'pressure for the hy
said spindle for moving the opposite end of said
hub'jmember to tilt the axis of said hub> member n
draulic actuator of machine table (not shown)
relative -to the axis of said spindle, and means
in such ‘manner that piston 22 is forced to its `
rearmost ‘position when table moves toward the
for moving said axially movable member.
Fig.
1.
"
«
'
v
`
v
` v To insure-that the "tool T will always have its
tool T and is forced to its retracted position as
shown in Fig. 1 when the table moves away from
the‘tool T.
It will be apparent that my improved retract
lable tool holder is susceptible to many modifica
tions and alternative constructions 'including
changes in size, shape, means of actuation and
arrangement of its parts without departing from
thefspirit of my invention and I do not intend
to‘limit'thescope thereof in any way other than
by the v'appended claims.
`
5. In a retractable tool holding means, a hol
low rotary machine spindle, a deformable mem
ber fixed to said machine spindle, a hub mem
ber supported by said deformable member and
vhaving its axis substantially coincident with the
said> spindle axis'and having axial extensions 'at
bothl sides- of said deformable member, a tool
member carried by one end extension of said
hub member, a member axially movable _in said
hollow machine spindle, cam means onsaid, last
mentioned member effective upon axial move
„ ment of said last mentioned member in saidispin
70 dle for engaging the opposite .endr extension> of
cipal support, a deformable diaphragm member
said hub member to move said hub member rela
Vl; vclaim as my invention:
'
.
' ' LfIn‘a retractable tool holding means, a prin
rigidly fixed to said principal support adjacent an
extremity of said deformable member and hav
ing a 'flexible portion, a hub supported by the
flexible portion of said deformable member sub
tive to the axis rof said spindle, and means_for
moving said axially movable member.
,
_`
.
i» 6. In a retractable tool holding means, a hollow.
rotary machine spindle, 'a tool supporting mem
2,412,038
5
6
low rotary machine spindle, a tool supporting
member rigidly secured to said spindle and having
a central deformable diaphragm extending trans
versely of and in alignment with the spindle axis,
with a socket adapted to receive an axially pro CII the outer face of said diaphragm being provided
with means to support an outwardly projecting
jecting tool member, the inner face of said dia
tool member, the inner face of said diaphragm
phragm being formed with a central projection
being formed with a central projection normally
normally extending coaxially With said spindle,
extending coaxially with said spindle, the inner
the inner end of said projection being formed
end of said projection being formed with a cam
10
with a frusto-conical recess deñning a cam sur
surface, an actuating member extending axially
face normally eccentric to the spindle axis, an
ber rigidly secured to said spindle and having a
central deformable diaphragm extending trans
versely of and in align-ment with the spindle axis,
the outer face of said diaphragm being formed
actuating member extending >axially through said
spindle and having a conical end cam adapted
for movement axially into and out of said recess
respectively to deflect or release said projection
and said diaphragm, and a concentric tubular
guide on said member extending in telescopic
relation with the inner end of said projection
and movable into centering engagement there
through said spindle and having an end cam sur«
face adapted for movement into and out of en
gagement with said ñrst mentioned surface re
spectively to laterally deflect or release said pro
jection, and a guide on said member movable into
engagement with said extension upon disengage
ment of said cam surfaces to insure positive 1o
cation of said projection and diaphragm in nor
with upon retraction of said cam from said recess. 20 mal position.
'7. In a retractable tool holding means, a hol
EDWARD C. FlîtEISEN.
Документ
Категория
Без категории
Просмотров
0
Размер файла
488 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа