U.S. patent application number 10/740959 was filed with the patent office on 2005-06-23 for out of round tool bit holder assembly.
This patent application is currently assigned to Donato L. Ricci. Invention is credited to Place, Brent.
Application Number | 20050132851 10/740959 |
Document ID | / |
Family ID | 34678005 |
Filed Date | 2005-06-23 |
United States Patent
Application |
20050132851 |
Kind Code |
A1 |
Place, Brent |
June 23, 2005 |
OUT OF ROUND TOOL BIT HOLDER ASSEMBLY
Abstract
A tool slide assembly mounted on a clamshell lathe where the
clamshell lathe is used to machine an out-of-round work piece. The
tool slide assembly generally comprises a base mounted on the
rotatable ring of the clamshell lathe and a tool bit holder. The
tool bit holder comprises a follower member and a tool block
adapted to hold a tool bit, where the follower member is urged
against an outer surface of the out-of-round work piece by a
plurality of springs. The tool block is incrementally translated
such that the tool bit gets fed into the out-of-round work
piece.
Inventors: |
Place, Brent; (Hager City,
WI) |
Correspondence
Address: |
NIKOLAI & MERSEREAU, P.A.
900 SECOND AVENUE SOUTH
SUITE 820
MINNEAPOLIS
MN
55402
US
|
Assignee: |
Donato L. Ricci
Hager City
WI
|
Family ID: |
34678005 |
Appl. No.: |
10/740959 |
Filed: |
December 17, 2003 |
Current U.S.
Class: |
82/113 |
Current CPC
Class: |
B23Q 1/4804 20130101;
Y10T 82/16 20150115; B23B 3/26 20130101; Y10T 82/22 20150115 |
Class at
Publication: |
082/113 |
International
Class: |
B23B 005/08 |
Claims
1. In a clamshell lathe assembly for machining a work piece, the
clamshell lathe assembly including a rotatable ring operatively
coupled to a stationary ring, the rotatable ring carrying a tool
bit for machining a work piece, wherein the improvement comprises:
(a) a tool slide assembly comprising a base and tool bit holder
slidably mounted on the base for holding the tool bit where said
base is adapted to be mounted on the face of the rotatable ring;
(b) a follower assembly operatively coupled to the tool bit holder
for following a contour of an outer surface of the work piece as
the tool bit is rotated about said outer surface, said follower
assembly including at least one roller operatively coupled to a
slide plate where plurality or springs operatively disposed between
the slide plate and the base urge the rollers against the outer
surface of the work piece; and (c) the tool bit holder further
including a tool block capable of incremental translation upon
orbiting at the rotatable ring.
2. (canceled)
3. The clamshell lathe in claim 1 wherein in the base has a
plurality of apertures for bolting the base to the face of the
rotatable ring.
4. The clamshell lathe in claim 1 wherein the slide plate has a
midline groove for receiving a threaded feed screw therein, the
feed screw carrying a feed nut that cooperates with the tool
block.
5. The clamshell lathe assembly in claim 4 here the tool block is
translated along the slide plate by rotation of the threaded feed
screw.
6. The clamshell lathe in claim 4 where the threaded feed screw is
supported by a feed screw bracket mounted on the tool bit holder
and the feed nut is mounted on a bottom surface of the tool
block.
7. The clamshell lathe in claim 4 where the threaded feed screw
further includes a starwheel for turning the threaded feed screw
upon a predetermined rotation of the rotatable ring.
8. The clamshell lathe assembly in claim 1 wherein the plurality of
springs are supported by a plurality of spring linkage rods that
extend through first and second spring brackets to first and second
rocker links, said first and second rocker being pivotally
connected to the tool bit holder.
9. The clamshell lathe assembly in claim 8 where the first and
second rocker links individually pivot on a first and second
shoulder screws extending through a midpoint of the first and
second rocker links into the tool bit holder.
10. The clamshell lathe assembly in claim 8 where the spring
linkage rods are attached to the first and second rocker links by
dowel pins extending through a clevis affixed to an end of the
spring linkage rods and the first and second rocker links.
11. The clamshell lathe assembly in claim 1 where the tension of
the plurality of springs is adjustable.
12. The clamshell lathe assembly in claim 1 where the tool block
comprises base member and a top cap for capturing the tool bit in
the tool block.
13. The clamshell lathe in claim 11 wherein the linkage rods are
threaded and carry a hex nut thereon, rotation of the hex nuts
varying the spring tension of the plurality of springs.
Description
I. BACKGROUND OF THE INVENTION
[0001] A. Field of the Invention
[0002] This invention relates to a new and improved assembly for
holding a tool bit used to machine an out-of-round work piece. In
particular the invention relates to a slidable assembly used in
connection with a clamshell lathe for machining a work piece.
[0003] B. Description of the Related Art
[0004] My previous U.S. Pat. No. 4,739,685 on a clamshell lathe
assembly teaches how to machine a pipe and provide a bevel cut
using a clamshell lathe. The major benefit of the '685 patent is
that it allows one to easily attach and detach the lathe from the
work piece to be machined. A tool bit mounted in a tool slide
affixed to the rotatable ring of the clamshell lathe then orbits
the pipe and machines said pipe.
[0005] A problem arises however when the work piece is
out-of-round. Prior lathe assemblies are designed for circular work
pieces. Out-of-round work pieces present a special challenge
because the prior art tool bits tend to make an uneven cut of the
out-of-round work piece. Specifically, if the tool bit does not
follow the outside surface of the work piece, the bevel length of
the cut changes at locations where the work piece is out-of-round.
Thus, a need exits to provide a tool bit slide that can follow the
outside diameters of the out-of-round work piece.
II. BRIEF SUMMARY OF THE INVENTION
[0006] The present invention relates to a tool slide assembly used
in a clamshell lathe where the clamshell lathe is being used to
machine an out-of-round work piece. The tool slide assembly
generally comprises a base mounted on a rotatable ring of the
clamshell lathe and a tool bit holder arranged to follow the outer
surface of an out-of-round work piece as the tool slide assembly is
rotated about said outer surface.
[0007] The tool bit holder includes a roller operatively coupled to
the tool bit holder. The roller is urged against the outer surface
of the work piece by a plurality of springs, which are operatively
disposed between the base and the tool bit holder. The tool bit
holder also includes a tool block, which holds the tool bit used to
make a bevel cut in the out-of-round work piece. The tool bit
holder is incrementally translated as it orbits the rotatable
ring.
III. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] The foregoing features, object and advantages of the
invention will become apparent to those skilled in the art from the
following detailed description of the preferred embodiment,
especially when considered in conjunction with the accompanying
drawings in which like numerals in the several views refer to
corresponding parts.
[0009] FIG. 1 is a front perspective view of the tool slide
assembly for machining an out-of-round work piece;
[0010] FIG. 2 is an exploded view of the tool slide assembly shown
in FIG. 1;
[0011] FIG. 3 is a rear perspective view of the tool slide assembly
shown in FIG. 1; and
[0012] FIG. 4 is a top perspective view of a first and second tool
slide assembly shown in FIG. 1 mounted onto a rotatable ring of a
clamshell lathe assembly.
IV. DETAILED DESCRIPTION OF THE INVENTION
[0013] The present invention represents broadly applicable
improvements to a tool slide assembly, which holds a tool bit for
use in a clamshell lathe assembly. The embodiments detailed herein
are intended to be taken as representative or exemplary of those in
which the improvements of the invention may be incorporated and are
not intended to be limiting. For purposes of discussion, and
without any limitation intended, the tool slide assembly of the
present invention will be described in conjunction with a clamshell
lathe assembly of known suitable construction. Those skilled in the
art will appreciate that the tool slide assembly of the present
invention may be utilized with a variety of other available lathes
for machining work pieces.
[0014] FIG. 1 shows a perspective view of the slide bit assembly
10. The exploded view in FIG. 2 shows that the tool bit assembly
generally comprises a base 12 and a tool bit holder. The tool bit
holder comprises a slide plate 14, which includes two rollers 16
and 18, that are journaled for rotation in an open-face shroud
comprised of a lower cup-shaped bracket 19 and an upper cup-shaped
bracket 21. An axel pin 23 passes through central aligned bores in
the top bracket 21 and the rollers 18 and 16. The shrouded roller
assembly is connected to a top surface of the slide plate 14 as
best seen in FIG. 3 by a support axle pin 23. The tool bit holder
further includes a tool block 20 for holding a tool bit 22 (FIG.
4). The tool bit 22 is captured in the tool block 20 by a top cap
24.
[0015] The slide plate further includes a midline groove 26 for
receiving a threaded feed screw 28 which carries a feed nut 30
(FIG. 2). The feed nut 30 is captured in a recess (not shown)
formed in the bottom surface of the tool block 20 and cooperates
with the feed nut 30 to translate the tool block 20 along the slide
plate 14. As the feed screw 28 is rotated, the feed nut 30 carries
the tool block 20 along the groove 26. The feed screw 28 is
supported by the feed nut 30 and a feed screw bracket 32 which is
mounted at the proximal end of the slide plate 14. A starwheel 34
is connected to an end of the feed screw 28 proximate to the feed
screw bracket 32. As the rotatable ring 60 of the clamshell carries
the tool slide assembly 10 past a stationary pin (not shown) a star
wheel 34 is engaged by the pin and the feed screw 28 is rotated,
thus translating the tool block 20 and the cutting tool 22 down the
slide plate 14.
[0016] The rollers 16 and 18 are urged against an outer surface of
a work piece by a plurality of helical compression springs,
including a first and second heavy spring 36a, 36b and a first and
second light springs 38a, 38b. The plurality of springs is
supported by spring linkages 40a, 40b, 40c and 40d that include
threaded rods that extend through the center of springs 36a, 36b,
38a, and 38b. The proximal ends 41a, 41b of the spring linkages
40a, 40b pass into a left spring bracket 42 through threaded
apertures 43a and 43b. The proximal ends 41c, 41d of the spring
linkages 40c, 40d pass into a right spring bracket 44 through
threaded apertures 43c and 43d. On the distal end of the spring
linkages 40a, and 40b are rocker clevis brackets 46a and 46b which
grasp an end of rocker link 48a. On the distal end of the spring
linkages 40c, 40d are rocker clevis brackets 46c and 46d which each
grasp an end of rocker link 48b. Dowel pins 50a, 50b, 50c, and 50d
pass through aligned holes in each rocker clevis bracket 46a, 46b,
46c, and 46d and in the rocker links 48a and 48b to connect the
spring linkages 40a, 40b, 40c, 40d to rocker links 48a and 48b. The
rocker links 48a and 48b horizontally pivot on the slide plate 14
on the axis provided by shoulder screws 52.
[0017] Hex nuts 56a, 56b, 56c, 56d are also mounted on spring
linkages 40a, 40b, 40c, and 40d proximate each rocker clevis
bracket 46a, 46b, 46c, and 46d. Washers 58a, 58b, 58c, and 58d is
mounted on spring linkages 40a, 40b, 40c, and 40d sandwiched
between Hex buts 56a, 56b, 56c, and 56d and light springs 36a and
36b and heavy springs 38a and 38b. Tightening of the hex nuts 56a,
56b, 56c, and 56d adjusts the tensions in the springs 36a, 36b,
38a, and 38b.
Operation
[0018] When the tool slide assembly 10 is mounted on the clamshell
lathe 60 the tool slide assembly 10 rotates about an out-of-round
work piece 63 (FIG. 4) with the roller 16 urged against the
out-of-round work piece 63. When the rollers 16 and 18 roll over a
high spot in the work piece 63, the rollers 16 and 18 push the
slide plate 14 and compresses the light springs 38a and 38b.
Because the tool block 20 and tool bit 22 are attached to the slide
plate 14, the tool block 20 and tool bit 22 follow the path of the
rollers 16 and 18. As the clamshell lathe ring gear 60 rotates
carrying the tool slide assembly 10, the star wheel 34 is tripped
feeding the tool bit 22 against the work piece 63. As the tool bit
22 gets fed into the work piece 63, the force pushing against the
light springs 38a and 38b is increased. Once the light springs 38a
and 38b are compressed to a pre-determined amount, the rocker links
48 transfer the force to the heavy springs 36a and 36b by pivoting.
The heavy springs 36a and 36b will compress and counteract the
force created by the tool bit 22 being fed into the out-of-round
work piece 63.
[0019] Obviously, many modifications and variations of the present
invention are possible in light of the above teaching. It is
therefore to be understood that, within the scope of the appended
claims, the invention may be practiced otherwise than as
specifically described.
* * * * *