U.S. patent application number 11/413847 was filed with the patent office on 2007-11-01 for interlocking tool holder.
Invention is credited to Stojan Stojanovski.
Application Number | 20070251068 11/413847 |
Document ID | / |
Family ID | 38562008 |
Filed Date | 2007-11-01 |
United States Patent
Application |
20070251068 |
Kind Code |
A1 |
Stojanovski; Stojan |
November 1, 2007 |
INTERLOCKING TOOL HOLDER
Abstract
An end mill chucking structure for chucking an end mill. The
chucking structure includes an end mill holder; a shank receivable
in an axial opening in the holder; a cone having an exterior cone
shape adapted to be received in a drive spindle and an axial
opening that is telescopically received on the shank; and a
retention knob mounted on the cone and connected to the shank for
axially pulling the shank toward a position in which an integral
neck on the cone is received in an opening in the tool holder. The
retention knob is rotated to pull the neck into a tapered structure
on the shank to wedge the neck in the tool holder.
Inventors: |
Stojanovski; Stojan; (Shelby
Township, MI) |
Correspondence
Address: |
STEVE M CLEMMONS
33150 SCHOOLCRAFT
SUITE 207
LIVONIA
MI
48150
US
|
Family ID: |
38562008 |
Appl. No.: |
11/413847 |
Filed: |
April 29, 2006 |
Current U.S.
Class: |
29/33K ; 29/700;
409/234 |
Current CPC
Class: |
B23B 31/006 20130101;
B23B 31/11 20130101; B23B 31/1075 20130101; Y10T 409/309408
20150115; Y10T 29/5191 20150115; Y10T 29/49865 20150115; Y10T
279/16 20150115; Y10T 29/53 20150115; B23B 2260/042 20130101; Y10T
409/30952 20150115; B23B 31/4033 20130101; Y10T 408/95
20150115 |
Class at
Publication: |
029/033.00K ;
029/700; 409/234 |
International
Class: |
B23P 21/00 20060101
B23P021/00; B23C 3/00 20060101 B23C003/00 |
Claims
1. A tool holder suited to be removably received into a tapered
opening in the spindle of a machine tool, comprising: a shank; a
tool holder body having an axial opening with a first end for
receiving a tool, a second end having an internal threaded means
for receiving said shank, and an annular seat for seating said
shank; wherein said shank has a first end for engaging the internal
threaded means of the tool holder body such that a shank body is
disposed axially beyond said annular seat, the shank having an
annular collar suited for seating on said annular seat such that
the shank and the holder body form an internal annular chamber
adjacent said annular seat; a cone having an external tapered wall
formed about an axial opening and receivable in an opening of a
rotatable drive spindle, the cone having a first end of a lesser
diameter and a second end of a greater diameter, the cone having a
radically expandable neck receivable in the internal annular
chamber of the tool holder body when the cone is telescopically
received on the shank; and knob means on the first end of the cone
connected to the shank to axially move the cone toward the body to
radically expand the neck to a wedged position between the tool
holder body and the shank.
2. The tool holder of claim 1, in which the knob means comprises
the shank having a threaded bore adjacent a retention knob seat on
the cone; and a retention knob having threaded structure engaged
with the threaded bore of the shank, and including a flange on the
retention knob seat such that as the retention knob is rotated, the
expandable neck is biased toward the seat in the tool holder
body.
3. The tool holder of claim 1, in which the shank has a cylindrical
section adjacent said collar, and a tapered section adjacent the
cylindrical section, and the neck is axially spaced from the collar
when the collar is seated on said annular seat such that extreme
end of the neck is operable to be radically biased by the holder
body toward the axis of rotation of the shank.
4. The tool holder of claim 1, in which the cone has an annular
face adjacent the neck, and the tool holder body has an annular
shoulder disposed such that the annular face is spaced from said
annular flange when the shank collar is seated in the tool holder
body.
5. The tool holder as defined in claim 1, in which the expandable
neck has an axial split which permits the neck to be radically
expanded.
6. The tool holder of claim 1, including threaded fastener means on
the tool holder body for engaging a tool in said axial opening to
lock the tool against axial motion with respect to the tool holder
body.
7. The tool holder of claim 1, in which the axial opening of the
tool holder body and the axial opening of the cone are aligned
along a common axis.
8. (canceled)
Description
BACKGROUND AND SUMMARY OF THE INVENTION
[0001] This invention is related to a chuck for connecting an end
mill to a drive spindle. The chucking structure includes a cone
that is received in a rotating spindle, a shank that is
telescopically received in the cone and threadably received in a
tool holder body. A retention knob joins the cone to the tool
holder body by expanding a collar on the cone into an opening in
the tool holder body as the retention knob is rotated.
[0002] Several forms of chucking structures are known for
connecting an end mill to a rotating spindle, generally using a
tapered body that is received in a tapered opening in the
spindle.
[0003] Art that has addressed this problem include U.S. Pat. No.
6,394,466 issued May 28, 2002 to Masakazu Matsumoto et al. for an
End Mill Chucking Structure, and U.S. Pat. No. 6,923,451 issued
Aug. 2, 2005 to Masahiro Taguchi et al. for a Tool Holder.
[0004] The broad purpose of the present invention is to provide a
tool holder chucking structure comprising a minimal number of
components, and usable with a variety of commercially available
spindles.
[0005] Still further objects and advantages of the invention will
become readily apparent to those skilled in the art to which the
invention pertains upon reference to the following detailed
description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] The description refers to the accompanying drawings in which
like reference characters refer to like parts throughout the
several views, and in which
[0007] FIG. 1 illustrates a tool holder embodying the
invention;
[0008] FIG. 2 is a longitudinal sectional view through the tool
holder of FIG. 1;
[0009] FIG. 3 is an exploded view of the major components of the
tool holder;
[0010] FIG. 4 is a sectional view as seen along lines 4-4 of FIG.
1;
[0011] FIG. 5 is an enlarged view illustrating the manner in which
the cone is joined to the tool holder body; and
[0012] FIG. 6 is an enlarged fragmentary sectional view of the neck
and tapered section of the shank.
DETAILED DESCRIPTION OF THE INVENTION
[0013] FIG. 1 illustrates a preferred tool holder 10 for joining a
tool, such as end mill 12, to a rotatable drive spindle 14, shown
in phantom. The tool can be any of a variety of rotatable cutting
tools. The spindle is conventional and is used in a variety of
commonly used power sources.
[0014] Tool holder 10 comprises a retention knob 16, a cone 18, a
shank 20 and a tool holder body 22.
[0015] Referring to FIGS. 1 and 2, body 22 has an axial
tool-receiving cylindrical bore 24. The lower end of bore 24 is
adapted to receive end mill 12. A pair of longitudinally offset
threaded fasteners 26 and 28, mounted on opposite sides of body 22,
provide means for joining end mill 12 to the tool holder body 22.
Bore 24 has a blind end 29.
[0016] The upper end of body 22, as viewed in FIG. 2, has a
stepped, shank-receiving bore 30. Bore 30 is axially aligned with
bore 24, and has an upper annular shoulder 32 and a smaller, lower
annular seat 34. Seat 34 is at the upper end of a female threaded
section 36.
[0017] Bore 30 has a cylindrical wall 38 between shoulder 32 and
seat 34. Bore 30 has a cylindrical wall 40 between shoulder 32 and
an annular flange 42. Flange 42 abuts the lower surface 44 of
spindle 14, when the tool is being rotated.
[0018] Shank 20 has a lower threaded end 46 that engages threaded
section 36. Threaded end 46 joins an annular collar 48. Collar 48
has a lower face 49 that abuts seat 34 when the shank is fully
joined to body 22. The outer cylindrical surface 49a of collar 48
is slidably received in cylindrical wall 38.
[0019] Referring to FIG. 6, the shank has a narrow cylindrical
section 50 that extends from the upper face 51 of the collar to the
lower end of a tapered section 52. Tapered section 52 extends to a
gage line 54. The balance of the shank is cylindrical from gage
line 54 to the upper end 56 of the shank. The upper end of the
shank has an internal threaded bore 58 which receives the lower
threaded end 60 of retention knob 16.
[0020] Cone 18 has an upper bearing surface 62 for seating the
retention knob, and a frustoconical wall 64 which progressively
enlarges in diameter to a gage line 66. The outer cylindrical
surface 68 of the cone extends from gage line 66 to a lower annular
flat face 70. Cylindrical surface 68 slidably engages cylindrical
wall 40 of the body. The cone has an axial bore 71.
[0021] Referring to FIGS. 3 and 6, the lower end 72 of the cone
forms a hollow neck 74. The outer surface 75 of neck 74 is
cylindrical and is received in an annular chamber 76 existing
between wall 40 of the body and tapered section 52 of the shank.
Neck 74 has a pair of axial splits 78 and 79 (FIG. 4) which permit
the neck 74 to radically expand. Neck 74 also has a tapered bore 80
that slidably engages the tapered section 52 of the shank.
[0022] The arrangement is such that as the cone is biased toward
the shank collar, neck 74 is expanded by the tapered section of the
shank in the direction of arrows 82 and 84, wedging the neck
between the shank and the body. In this seated position, a small
clearance exists between lower flat face 85 of the neck and the
upper face 51 of the collar. Further, a clearance exists between
flat face 70 of the cone and the upper shoulder 32 of the body.
[0023] Referring to FIG. 6, the lower end of the neck overlaps the
narrow cylindrical section 50 of the shank so the extreme lower end
of the neck is biased radically inwardly in the direction of arrows
86 and 88 while the major portion of the tapered bore of the neck
is biased radically outwardly. This arrangement assists in forming
a firm wedged connection between the cone and the body.
* * * * *