Note: Descriptions are shown in the official language in which they were submitted.
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TQOL EIOLDER WITEI PLURAI.ITY
OF CUTTI~G I~SE:RTS
Back~round of the Invention
This inven-tion is related to tool holders for
indexable cutting inserts, and more particularly to a tool
holder having a shank mounted in a body with a plurality of
removable inserts disposed such that when mounted on the tool
post of a lathe, the user can move any of the inserts into a
cutting engagemen-t with the workpiece by rotating the shank.
Indexable inserts are commonly employed for
metal forming operations. Indexable inserts have
several cutting edges so that by repositioning the insert in
a pocket in the tool holder, a series of cutting edges can be
succ~s~ively disposed in a cutting position. However, the
insert must be removed from the pocket and replaced with
another insert to provide a difEerent cutting or Einishing
action. Thus, if a workpiece is to be successively cut with
diE~erent inserts, such as a roughing insert, and then with a
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facing or finishing insert, either the insert must be
replaced in the tool holder, or the tool holder and insert
replaced with another tool holder.
Some multiple tool holders are known in the prior art
such as United Sta-tes Patent No. 3,513,733 which issued to J.
Anania, June 11, 1968; United States Patent No. 3,498,163
which issued to J. L. Jeannexet, March 3, 1970; and United
States patent No. 3,670,608 which issued to Otto Marzy, June
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68387-30
Summary of the Invention
The bxoad purpose of the presen~ inventlon is to
provide a tool holder having a shank mounted in a body which
~an be mounted in ~onven~ional, commercially-availahl~ lathe
tool posts The shank is rotatable with respect to the body,
and has a handle a~ one end and a head at the opposlte end.
The head has four pockets, each adapted to receive an indexable
insert. ~ach insert can be indexed in i~s respec~ive pocket to
present several cutting edgeg.
The lnserts are moun~ed on the head such that by
rotating the head with the handle, the user can replace a
cutting insert in a cutting position on the lathe with another
insert having either similar or different cutting edges, thus
providing a quick me~hod for changing inserts. For example,
one lnsert miyht be adapted for a rou~h cut, and ano~her insert
adapted for a ~urning or facing cu~.
In accordance wlth a broad aspect of the invention
there is provided a combination comprising:
an elongated body having a longitudinal opening;
2n a shank disposed in the longitudinal opening of the body
for rotatable and longitudinal motion, the shank having a ~irst
end ad~acent one end of ~he body and a second end adjacent the
opposi~e end of the body;
;~ handle means carried on the first end of the shank for
rotating same between a ~irst rotated position and a second
rotated position, and ~or moving same be$ween longltudinally
spaced positions a~ong a generally linear path of motion,
including a locking position and a release position;
tool holder means including a head carried on ~he ~econd
end of th~ shank so a~ to be movable therewith between said
locking position and said release position;
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68387-30
a first cutting insert ~nd a second cutting insert mounted
on the head such tha~ the first insert is disposed in a cutting
position i~ said first rotated position, and the second insert
is disposed in said cutting position when the first insert is
disposed in said second rotated position;
interengagable pin and socket means carried on the head
and the body, including a socket and a pin member received in
the socket as ~he hanclle means is moved to said locking
position r to block the head against rotation with respect to
the body, the pin being removable from the socket as the handle
means is moved to said release posi~ion, to permit rotation of
~he head with respect to the body; and
bias means carried between the shank and the body to bias
~ the shank towards sald locking position with respect to the
:~ body, whereby the user can exchange the first insert ~ith the
second insert by pushing the handle in a linear mo~ion to
release the head, rotating the head and the releasing handle as
the pin is received in said socket.
: Still ~urther objects and advantages o~ the present
invention will become readily apparent to those skilled in the
art to which the invention pertains upon reference to the
~ollowing detailed descriptlon.
Descri~tion o ~the Drawinq~
~: The descrip~ion refers to the accompanying dra~ings
in which like reference characters re~er to like parts
through~ut thq several vlews, and in which-
FIGURE 1 is a perspective view o~ a tool holder
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illus-tra-ting the preferred embodiment of the invention;
FIGU:~E 2 is a longitudinal sectional view of the tool
holder body;
FIGURE 3 is a view of -the tool holder shank and
return spring;
FIGURE 4 is a view of the body as seen from the left
side of Flgure 2;
FIGURE 5 is a view of the face of the head that
mates with the shank;
FIGURE 6 is a view of the head showing a pair of
inserts;
FIGURE 7 is a view of the head with the inserts
removed from their respective pockets; and
F IG U RES 8- 1 0 a re v ie w s o f d iffe r en t
indexable inserts mounted on the head.
DescriE~ion of the Preferred Embodiment
Referring to the drawings, a preEerred tool holder
means 10 comprises a body 12 supporting an elongated shank
14. Body 12 preferably has a square cross-section so that it
can be mounted in the slot of a conventional tool post on a
lathe (not shown). Referring to Figure 2, body 12 has
enlarged end 16 and a longitudinal bore 20 which terminates
at one end with an enlarged opening 22 to define annular
- shoulder 24. ~he opposite end of bore 20 terminates in
enlarged opening 26 in end 15. The body also has tapped
opening 28 disposed along an axis at right angles to
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longitudinal axis 30 to the body.
Referring to Flgure 1, set screw 32 is received in
tapped opening 28.
Shank 14 has a handle 32 at one end and a threaded
end 34 at its opposite end. The shank has a shoulder 36
receivable in opening 22 of the body. A helical spring 38 is
mounted on the shank and received in opening 22 so as to be
compressed between shoulder 24 in the body and shoulder 36 on
the shank. The spring biases handle 32 away from shoulder
24.
The shank also has an annular groove 40 which may be
aligned with tapped opening 28. When groove 40 is aligned
with opening 28, set screw 32 provides means for ]ocking the
shank against longitudinal motion with respect to body 12.
Enlarged end 16 has opening 42. Dowel 44 is mounted
in opening 42.
Referring to Figure 6, head 50 has threaded opening
52 f~r engaging threaded end 34 of the shank. The head has a
boss 54 slidably receivable in opening 26 in the body.
ReEerring to Figure 5, the head also has four
locating openings 56, 58, 60 and 62, equi-angularly disposed
about central, threaded opening 52 and adapted to receive the
end of dowel 44 to lock the head in a selected position of
four rotated positions with respect to the body. Thusl when
the shank is mounted in the body, spring 38 biases the head
toward the body so that the dowel slides against the rear
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surface of the head until it is aligned with a selected oneof the four op~nings 56 to 62. The spr.ing then snaps the
head into abutment wi-th the enlarged end 16 of the body as
the dowel is received in the selected opening.
Referring to Figure 1, the head has four tool-
receiving pockets 64, 66, 68 and 70, disposed at 90 degree
angle intervals about axis 30. Indexable inserts
72, 74, 76 and 78 are mounted in pockets 64, ~6, 68 and 70,
respectively. The insert.s are mounted on spacers 8~, 82, ~4
and 86 respectively. The inserts are commercially available
cutting tools, each having a central opening 90, as
illustrated in Figure 8, for receiving a set screw 92 in a
tapped opening (not shown) in the head for attaching each
insert in its respective pocket. Each pocket is formed with
respect to its respective insert such that the insert can be
indexed by loosening its mounting screw and rotating the
insert to bring a different cutting edge into cutting
posi-tion.
Referrin~ to Figure 6, insert 72 is illustrated with
a cutting edge disposed for engaging workpiece 94. The
position of the cutting edge is disposed a radial distance
"A" from the axis of rotation of the shank which coincides
with the longitudinal axis 30 o the body. Insert 74 is
i mounted in its pocket with a cutting edge disposed such that
by rotating the shank with respect to the body~ insert 74 is
rotated so that its cutting edge engages the workpiece a
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dis-tance "A" from the axis of ro-ta-tion of the shank. The
u~ser can quickly dispose a second insert in-to a cutting
posi-tion by merely rotating the shank with respect to the
body, and without any further adjus-tmen-t of -the insert~ The
first insert, for example, can be used for a rough cut and
the second insert Eor a facing cut, or the inserts can be
identical, in two separate pockets, so that the user can
replace an insert having worn cut-ting edges for an insert
having sharp cutting edges.
Thus, the tool can be used, for example, for locking
four diEferent inserts on a single head with means for
quickly changing one insert for another. Each insert is
removable from the head so that the user can replace an
insert without removing the holder from the tool post. The
body is adapted to be received in a conventionally shaped
tool post. The head can also be mounted on a lathe to
function as a boring tool with a replaceable cutting insert.
}laving descrited my invention, I claim:
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