U.S. patent number 10,385,689 [Application Number 15/928,269] was granted by the patent office on 2019-08-20 for bit holder.
This patent grant is currently assigned to The Sollami Company. The grantee listed for this patent is Phillip Sollami. Invention is credited to Phillip Sollami.
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United States Patent |
10,385,689 |
Sollami |
August 20, 2019 |
Bit holder
Abstract
A unitary bit/holder and/or a bit holder including a body
portion and a shank. The body portion and the shank being coaxial
and including a bore extending from a forward end of the body
portion to the distal end of the shank. The shank further including
a segment adjacent a distal end of the shank that includes a
plurality of ribs and at least one notch or relief zone between
each rib in the plurality of ribs.
Inventors: |
Sollami; Phillip (Herrin,
IL) |
Applicant: |
Name |
City |
State |
Country |
Type |
Sollami; Phillip |
Herrin |
IL |
US |
|
|
Assignee: |
The Sollami Company (Herrin,
IL)
|
Family
ID: |
67620637 |
Appl.
No.: |
15/928,269 |
Filed: |
March 22, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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14512581 |
Oct 13, 2014 |
10072501 |
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12870289 |
Aug 27, 2010 |
8622482 |
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15928269 |
Mar 22, 2018 |
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15708292 |
Sep 19, 2017 |
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14628482 |
Feb 23, 2015 |
9879531 |
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15928269 |
Mar 22, 2018 |
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14959551 |
Dec 4, 2015 |
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15928269 |
Mar 22, 2018 |
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15699504 |
Sep 8, 2017 |
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14959551 |
Dec 4, 2015 |
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15928269 |
Mar 22, 2018 |
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14690679 |
Apr 20, 2015 |
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61891683 |
Oct 16, 2013 |
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61944646 |
Feb 26, 2014 |
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62100764 |
Jan 7, 2015 |
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61983291 |
Apr 23, 2014 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E21C
35/18 (20130101); E21C 35/191 (20200501); E21C
35/197 (20130101); E21C 35/188 (20200501); E21C
35/19 (20130101) |
Current International
Class: |
E21C
35/19 (20060101); E21C 35/18 (20060101); E21C
35/197 (20060101) |
Field of
Search: |
;299/79.1,81.1,81.3,102-111,113 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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102004049710 |
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Apr 2006 |
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DE |
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102011079115 |
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Jan 2013 |
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DE |
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202012100353 |
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Jun 2013 |
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DE |
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102015121953 |
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Jul 2016 |
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DE |
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102016118658 |
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Mar 2017 |
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DE |
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2483157 |
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Feb 2012 |
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GB |
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2008105915 |
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Sep 2008 |
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WO |
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2008105915 |
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Sep 2008 |
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WO |
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2009006612 |
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Jan 2009 |
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WO |
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Primary Examiner: Singh; Sunil
Attorney, Agent or Firm: O'Connor; Mercedes V. Rockman
Videbeck & O'Connor
Parent Case Text
CROSS-REFERENCE TO RELATED APPLICATION(S)
This application claims priority to and is a continuation-in-part
of U.S. Provisional Application No. 61/891,683, filed Oct. 16,
2013, claims priority to and is a continuation-in-part of U.S.
Non-provisional application Ser. No. 12/870,289, filed Aug. 27,
2010, now U.S. Pat. No. 8,622,482, issued Jan. 7, 2014, claims
priority to and is a continuation-in-part of U.S. Non-provisional
application Ser. No. 14/512,581, filed Oct. 13, 2014, claims
priority to and is a continuation-in-part of U.S. Provisional
Application No. 61/944,646, filed Feb. 26, 2014, claims priority to
and is a continuation-in-part of U.S. Non-provisional application
Ser. No. 14/628,482, filed Feb. 23, 2015, now U.S. Pat. No.
9,879,531, issued Jan. 30, 2018, claims priority to and is a
continuation-in-part of U.S. Non-provisional application Ser. No.
15/708,292, filed Sep. 19, 2017, claims priority to and is a
continuation-in-part of U.S. Provisional Application No.
62/100,764, filed Jan. 7, 2015, claims priority to and is a
continuation-in-part of U.S. Non-provisional application Ser. No.
14/959,551, filed Dec. 4, 2015, claims priority and is a
continuation-in-part to U.S. Provisional Application No.
61/983,291, filed Apr. 23, 2014, claims priority to and is a
continuation-in-part to U.S. Non-Provisional application Ser. No.
14/690,679, filed Apr. 20, 2015, and claims priority to and is a
continuation-in-part of U.S. Non-provisional application Ser. No.
15/699,504, filed Sep. 8, 2017, to the extent allowed by law and
the contents of which are incorporated herein by reference in their
entireties.
Claims
What is claimed is:
1. A bit holder comprising: a forward body portion having a bottom;
a generally cylindrical hollow shank depending axially from the
bottom of the forward body portion, the shank comprising: a first
segment adjacent a distal end of the shank, the first segment
comprising a plurality of ribs solely around a first outer surface
of the first segment; a slot axially extending from the distal end
of the shank to a slot termination disposed in a second segment
adjacent the first segment, the second segment comprising a smooth
second outer surface, a first diameter of the first segment
subjacent the second segment greater than a second diameter of the
second segment; and a bore axially extending from a forward end of
the forward body portion to the distal end of the shank, a portion
of the bore internally adjacent the first segment, the portion
including a smooth surface.
2. The bit holder of claim 1, further comprising: at least one
notch disposed between each rib of the plurality of ribs.
3. The bit holder of claim 2, wherein the at least one notch is
U-shaped.
4. The bit holder of claim 2, wherein the at least one notch
includes a pair of sides, each side disposed at at least one of an
acute angle, an obtuse angle, and a right angle to a plane through
a centerline of the bit holder.
5. The bit holder of claim 1, wherein each rib in the plurality of
ribs includes a pair of sides, each side disposed at at least one
of an acute angle, an obtuse angle, and a right angle to a plane
through a centerline of the bit holder.
6. The bit holder of claim 1, wherein the plurality of ribs is
adapted to reduce a surface contact between the segment and a
complementary portion of a bore of a base block and to provide a
more evenly distributed and more highly concentrated force per
segment.
7. A unitary bit/holder comprising: a forward body portion having a
bottom; a generally cylindrical hollow shank depending axially from
the bottom of the forward body portion, the shank comprising: a
first segment adjacent a distal end of the shank, the first segment
comprising a plurality of ribs solely around a first outer surface
of the first segment; a slot axially extending from the distal end
of the shank to a slot termination disposed in a second segment
adjacent the first segment, the second segment comprising a smooth
second outer surface, a first diameter of the first segment
subjacent the second segment greater than a second diameter of the
second segment; and a bore axially extending from a forward end of
the forward body portion to the distal end of the shank, a portion
of the bore internally adjacent the first segment, the portion
including a smooth surface.
8. The unitary bit/holder of claim 7, further comprising: at least
one notch disposed between each rib of the plurality of ribs.
9. The unitary bit/holder of claim 8, wherein the at least one
notch is U-shaped.
10. The unitary bit/holder of claim 8, wherein the at least one
notch includes a pair of sides, each side disposed at at least one
of an acute angle, an obtuse angle, and a right angle to a plane
through a centerline of the unitary bit/holder.
11. The unitary bit/holder of claim 7, wherein each rib in the
plurality of ribs includes a pair of sides, each side disposed at
at least one of an acute angle, an obtuse angle, and a right angle
to a plane through a centerline of the unitary bit/holder.
12. The unitary bit/holder of claim 7, wherein the plurality of
ribs is adapted to reduce a surface contact between the segment and
a complementary portion of a bore of a base block and to provide a
more evenly distributed and more highly concentrated force per
segment.
13. A combination for a bit assembly comprising: one of a unitary
bit/holder and a bit holder comprising: a forward body portion
having a bottom; a generally cylindrical hollow shank depending
axially from the bottom of the forward body portion, the shank
comprising: a first segment adjacent a distal end of the shank, the
first segment comprising a plurality of ribs solely around a first
outer surface of the first segment; a slot axially extending from
the distal end of the shank to a slot termination disposed in a
second segment adjacent the first segment, the second segment
comprising a smooth second outer surface, a first diameter of the
first segment subjacent the second segment greater than a second
diameter of the second segment; a shank bore axially extending from
a forward end of the forward body portion to the distal end of the
shank, a portion of the shank bore internally adjacent the first
segment, the portion including a smooth surface; and a base block
comprising a base block bore adapted to make an interference
contact with at least the first segment of the shank, the plurality
of ribs adapted to reduce a surface contact between the first
segment and a complementary portion of the base block bore of the
base block and to provide a more evenly distributed and more highly
concentrated force per segment.
14. The combination of claim 13, further comprising: at least one
notch disposed between each rib of the plurality of ribs.
15. The combination of claim 14, wherein the at least one notch is
U-shaped.
16. The combination of claim 14, wherein the at least one notch
includes a pair of sides, each side disposed at at least one of an
acute angle, an obtuse angle, and a right angle to a plane through
a centerline of at least one of the unitary bit/holder and the bit
holder.
17. The combination of claim 13, wherein each rib in the plurality
of ribs includes a pair of sides, each side disposed at at least
one of an acute angle, an obtuse angle, and a right angle to a
plane through a centerline of at least one of the unitary
bit/holder and the bit holder.
Description
TECHNICAL FIELD
This disclosure relates to bit assemblies for road milling, mining,
and trenching equipment, and more particularly, to a bit holder for
use road milling, mining, and trenching machines.
BACKGROUND
Road milling, mining, and trenching equipment utilizes bits
traditionally set in a bit assembly having a bit holder and/or a
bit holder block. In one embodiment, the bit is retained by the bit
holder and the bit holder is retained in the bit holder block. In
another embodiment a unitary bit/holder is retained in the bit
holder block. A plurality of the bit assemblies are mounted on the
outside of a rotatable drum in staggered positions, typically in a
V-shaped or spiral configuration, in an effort to create the
smoothest road milling. The combinations of bit assemblies have
been utilized to remove material from the terra firma, such as
degrading the surface of the earth, minerals, cement, concrete,
macadam or asphalt pavement. Individual bits, bit holders, and bit
holder blocks may wear down or break over time due to the harsh
road degrading environment. Additionally, the bit holder or the
unitary bit/holder may be ejected out of the bit holder block bore
due to the harsh road degrading environment. A need has developed
to provide a bit holder and/or a unitary bit/holder that makes a
sufficient radial connection with the bit holder block bore to
prevent the bit holder and/or unitary bit/holder from being ejected
out of the bit holder block bore during harsh operations.
Additionally, to provide greater radial force, a shank of the bit
holder and/or unitary bit/holder comprises notches and/or relief
zones adapted to reduce surface contact between the shank of the
bit holder, and/or unitary bit/holder, and the bit holder block
bore.
SUMMARY
This disclosure relates generally to bit assemblies for road
milling, mining, and trenching equipment. One implementation of the
teachings herein is a bit holder that includes a body having a
bottom; and a generally cylindrical shank depending axially from
the bottom of the body, the shank including a segment adjacent a
distal end of the shank, the segment including a plurality of
ribs.
In another implementation of the teachings herein is a combination
for a bit assembly that includes one of a unitary bit/holder and a
bit holder comprising: a forward body portion having a bottom; and
a generally cylindrical hollow shank depending axially from the
bottom of the forward body portion, the shank comprising: a segment
adjacent a distal end of the shank, the segment comprising a
plurality of ribs; and a base block comprising a bore adapted to
make an interference contact with at least the segment of the
shank, the plurality of ribs adapted to reduce a surface contact
between the segment and a complementary portion of the bore of the
base block and to provide a more evenly distributed and more highly
concentrated force per segment.
These and other aspects of the present disclosure are disclosed in
the following detailed description of the embodiments, the appended
claims and the accompanying figures.
BRIEF DESCRIPTION OF THE DRAWINGS
The various features, advantages, and other uses of the apparatus
will become more apparent by referring to the following detailed
description and drawings, wherein like reference numerals refer to
like parts throughout the several views. It is emphasized that,
according to common practice, the various features of the drawings
are not to-scale. On the contrary, the dimensions of the various
features are arbitrarily expanded or reduced for clarity.
FIG. 1 is a top elevation view of a first embodiment of a bit
holder in accordance with implementations of this disclosure;
FIG. 2 is a side perspective view of the first embodiment of the
bit holder in accordance with implementations of this
disclosure;
FIG. 3 is a side elevation view of the first embodiment of the
holder in accordance with implementations of this disclosure;
FIG. 4 is a detail perspective view of Detail A of the first
illustrated embodiment of the bit holder of FIG. 2 in accordance
with implementations of this disclosure;
FIG. 5 is an exploded top elevation view of the first embodiment of
the bit holder and a bit holder block, showing invisible internal
elements in dotted lines, in accordance with implementations of
this disclosure;
FIG. 6 is an exploded side elevation view of the first embodiment
of the bit holder and the bit holder block, showing invisible
internal elements in dotted lines, in accordance with
implementations of this disclosure;
FIG. 7 is an exploded side perspective view of the first embodiment
of the bit holder and the bit holder block, showing invisible
internal elements in dotted lines, in accordance with
implementations of this disclosure;
FIG. 8 is a top elevation view of the first embodiment of the bit
holder assembled with the bit holder block, showing invisible
internal elements in dotted lines, in accordance with
implementations of this disclosure;
FIG. 9 is a side elevation view of the first embodiment of the bit
holder assembled with the bit holder block, showing invisible
internal elements in dotted lines, in accordance with
implementations of this disclosure;
FIG. 10 is a side perspective view of the first embodiment of the
bit holder assembled with the bit holder block, showing invisible
internal elements in dotted lines, in accordance with
implementations of this disclosure;
FIG. 11 is a side perspective view of the first embodiment of the
bit holder assembled with the bit holder block, showing invisible
internal elements in dotted lines, in accordance with
implementations of this disclosure;
FIG. 12 is an cross-sectional view of the first embodiment of the
bit holder assembled with the bit holder block, taken along Line
B-B of FIG. 11, in accordance with implementations of this
disclosure;
FIG. 13 is a top elevation view of a second embodiment of a bit
holder, showing invisible internal elements in dotted lines, in
accordance with implementations of this disclosure;
FIG. 14 is a side elevation view of the second embodiment of the
bit holder, showing invisible internal elements in dotted lines, in
accordance with implementations of this disclosure;
FIG. 15 is a side perspective view of the second embodiment of the
bit holder in accordance with implementations of this
disclosure;
FIG. 16 is a detail perspective view of Detail B of the second
illustrated embodiment of the bit holder of FIG. 15 in accordance
with implementations of this disclosure;
FIG. 17 an exploded top elevation view of the second illustrated
embodiment of the bit holder and a bit holder block in accordance
with implementations of this disclosure;
FIG. 18 is an exploded side elevation view of the second
illustrated embodiment of the bit holder and the bit holder block
in accordance with implementations of this disclosure;
FIG. 19 is an exploded side perspective view of the second
illustrated embodiment of the bit holder and the bit holder block
in accordance with implementations of this disclosure;
FIG. 20 is a top elevation view of the second illustrated
embodiment of the bit holder assembled with the bit holder block,
showing invisible internal elements in dotted lines, in accordance
with implementations of this disclosure;
FIG. 21 is a side elevation view of the second illustrated
embodiment of the bit holder assembled with the bit holder block,
showing invisible internal elements in dotted lines, in accordance
with implementations of this disclosure;
FIG. 22 is a side perspective view of the second illustrated
embodiment of the bit holder assembled with the bit holder block,
showing invisible internal elements in dotted lines, in accordance
with implementations of this disclosure;
FIG. 23 is a top elevation view of a third illustrated embodiment
of a bit holder in accordance with implementations of this
disclosure;
FIG. 24 is a side elevation view of the third illustrated
embodiment of the bit holder in accordance with implementations of
this disclosure;
FIG. 25 is a detail elevation view of Detail C of the third
illustrated embodiment of the bit holder of FIG. 24 in accordance
with implementations of this disclosure;
FIG. 26 is a side perspective view of the third illustrated
embodiment of the bit holder in accordance with implementations of
this disclosure;
FIG. 27 is a detail perspective view of Detail D of the third
illustrated embodiment of the bit holder of FIG. 26 in accordance
with implementations of this disclosure;
FIG. 28 is an exploded top elevation view of the third illustrated
embodiment of the bit holder and a bit holder block in accordance
with implementations of this disclosure;
FIG. 29 is an exploded side elevation view of the third illustrated
embodiment of the bit holder and the bit holder block in accordance
with implementations of this disclosure;
FIG. 30 is an exploded side perspective view of the third
illustrated embodiment of the bit holder and the bit holder block
in accordance with implementations of this disclosure;
FIG. 31 is a top elevation view of the third illustrated embodiment
of the bit holder assembled with the bit holder block, showing
invisible internal elements in dotted lines, in accordance with
implementations of this disclosure;
FIG. 32 is a side elevation view of the third illustrated
embodiment of the bit holder assembled with the bit holder block,
showing invisible internal elements in dotted lines, in accordance
with implementations of this disclosure;
FIG. 33 is a side perspective view of the third illustrated
embodiment of the bit holder assembled with the bit holder block,
showing invisible internal elements in dotted lines, in accordance
with implementations of this disclosure;
FIG. 34 is a top elevation view of a fourth illustrated embodiment
of a bit holder in accordance with implementations of this
disclosure;
FIG. 35 is a side elevation view of the fourth illustrated
embodiment of the bit holder in accordance with implementations of
this disclosure;
FIG. 36 is a detail elevation view of Detail E of the fourth
illustrated embodiment of the bit holder of FIG. 35 in accordance
with implementations of this disclosure;
FIG. 37 is a side perspective view of the fourth illustrated
embodiment of the bit holder in accordance with implementations of
this disclosure;
FIG. 38 is a detail perspective view of Detail F of the fourth
illustrated embodiment of the bit holder of FIG. 37 in accordance
with implementations of this disclosure;
FIG. 39 is an exploded top elevation view of the fourth illustrated
embodiment of the bit holder and a bit holder block in accordance
with implementations of this disclosure;
FIG. 40 is an exploded side elevation view of the fourth
illustrated embodiment of the bit holder and the bit holder block
in accordance with implementations of this disclosure;
FIG. 41 is an exploded side perspective view of the fourth
illustrated embodiment of the bit holder and the bit holder block
in accordance with implementations of this disclosure;
FIG. 42 is a top elevation view of the fourth illustrated
embodiment of the bit holder assembled with the bit holder block,
showing invisible internal elements in dotted lines, in accordance
with implementations of this disclosure;
FIG. 43 is a side elevation view of the fourth illustrated
embodiment of the bit holder assembled with the bit holder block,
showing invisible internal elements in dotted lines, in accordance
with implementations of this disclosure;
FIG. 44 is a side perspective view of the fourth illustrated
embodiment of the bit holder assembled with the bit holder block,
showing invisible internal elements in dotted lines, in accordance
with implementations of this disclosure;
FIG. 45 is a top elevation view of a fifth illustrated embodiment
of a bit holder in accordance with implementations of this
disclosure;
FIG. 46 is a side elevation view of the fifth illustrated
embodiment of the bit holder in accordance with implementations of
this disclosure;
FIG. 47 is a detail elevation view of Detail G of the fifth
illustrated embodiment of the bit holder of FIG. 46 in accordance
with implementations of this disclosure;
FIG. 48 is a side perspective view of the fifth illustrated
embodiment of the bit holder in accordance with implementations of
this disclosure;
FIG. 49 is a detail perspective view of Detail H of the fifth
illustrated embodiment of the bit holder of FIG. 48 in accordance
with implementations of this disclosure;
FIG. 50 is an exploded top elevation view of the fifth illustrated
embodiment of the bit holder and a bit holder block in accordance
with implementations of this disclosure;
FIG. 51 is an exploded side elevation view of the fifth illustrated
embodiment of the bit holder and the bit holder block in accordance
with implementations of this disclosure;
FIG. 52 is an exploded side perspective view of the fifth
illustrated embodiment of the bit holder and the bit holder block
in accordance with implementations of this disclosure;
FIG. 53 is a top elevation view of the fifth illustrated embodiment
of the bit holder assembled with the bit holder block, showing
invisible internal elements in dotted lines, in accordance with
implementations of this disclosure;
FIG. 54 is a side elevation view of the fifth illustrated
embodiment of the bit holder assembled with the bit holder block,
showing invisible internal elements in dotted lines, in accordance
with implementations of this disclosure;
FIG. 55 is a side perspective view of the fifth illustrated
embodiment of the bit holder assembled with the bit holder block,
showing invisible internal elements in dotted lines, in accordance
with implementations of this disclosure;
FIG. 56 is a top elevation view of a sixth illustrated embodiment
of a bit holder in accordance with implementations of this
disclosure;
FIG. 57 is a side elevation view of the sixth illustrated
embodiment of the bit holder in accordance with implementations of
this disclosure;
FIG. 58 is a detail elevation view of Detail I of the sixth
illustrated embodiment of the bit holder of FIG. 57 in accordance
with implementations of this disclosure;
FIG. 59 is a side perspective view of the sixth illustrated
embodiment of the bit holder in accordance with implementations of
this disclosure;
FIG. 60 is a detail perspective view of Detail J of the sixth
illustrated embodiment of the bit holder of FIG. 59 in accordance
with implementations of this disclosure;
FIG. 61 is an exploded top elevation view of the sixth illustrated
embodiment of the bit holder and a bit holder block in accordance
with implementations of this disclosure;
FIG. 62 is an exploded side elevation view of the sixth illustrated
embodiment of the bit holder and the bit holder block in accordance
with implementations of this disclosure;
FIG. 63 is an exploded side perspective view of the sixth
illustrated embodiment of the bit holder and the bit holder block
in accordance with implementations of this disclosure;
FIG. 64 is a top elevation view of the sixth illustrated embodiment
of the bit holder assembled with the bit holder block, showing
invisible internal elements in dotted lines, in accordance with
implementations of this disclosure;
FIG. 65 is a side elevation view of the sixth illustrated
embodiment of the bit holder assembled with the bit holder block,
showing invisible internal elements in dotted lines, in accordance
with implementations of this disclosure;
FIG. 66 is a side perspective view of the sixth illustrated
embodiment of the bit holder assembled with the bit holder block,
showing invisible internal elements in dotted lines, in accordance
with implementations of this disclosure;
FIG. 67 is an exploded side elevation view of the fourth
illustrated embodiment of the bit holder and a first illustrated
embodiment of the unitary bit/holder, shown with a bit holder block
and a bit, in accordance with implementations of this
disclosure;
FIG. 68 is an exploded perspective view of the fourth illustrated
embodiment of the bit holder and the first illustrated embodiment
of the unitary bit/holder, shown with the bit holder block and the
bit, in accordance with implementations of this disclosure;
FIG. 69 is a side perspective view of the fourth illustrated
embodiment of the bit holder assembled with the bit into the first
illustrated embodiment of the unitary bit/holder and the first
illustrated embodiment of the unitary bit/holder assembled with the
bit holder block, showing invisible internal elements in dotted
lines, in accordance with implementations of this disclosure;
and
FIG. 70 is a side elevation view of the fourth illustrated
embodiment of the bit holder assembled with the bit into the first
illustrated embodiment of the unitary bit/holder and the first
illustrated embodiment of the unitary bit/holder assembled with the
bit holder block, showing invisible internal elements in dotted
lines, in accordance with implementations of this disclosure.
DETAILED DESCRIPTION
Road milling, mining, and trenching equipment utilizes bits
traditionally set in a bit assembly having a bit holder and/or a
bit holder block. In one embodiment, the bit is retained by the bit
holder and the bit holder is retained in the bit holder block. In
another embodiment a unitary bit/holder is retained in the bit
holder block, hereinafter referred to as a base block. A plurality
of the bit assemblies are mounted on the outside of a rotatable
drum in staggered positions, typically in a V-shaped or spiral
configuration, in an effort to create the smoothest road milling.
The combinations of bit assemblies have been utilized to remove
material from the terra firma, such as degrading the surface of the
earth, minerals, cement, concrete, macadam or asphalt pavement.
Individual bits, unitary bit/holders, bit holders, and base blocks
may wear down or break over time due to the harsh road degrading
environment. Additionally, the bit holder or the unitary bit/holder
may be ejected out of the base block bore due to the harsh road
degrading environment. A need has developed to provide a bit holder
and/or a unitary bit/holder that makes a sufficient radial
connection with the base block bore to prevent the bit holder
and/or unitary bit/holder from being ejected out of the base block
bore during harsh operations. Additionally, to provide greater
radial force, a shank of the bit holder and/or unitary bit/holder
comprises ribs, notches and/or relief zones adapted to reduce
surface contact between the shank of the bit holder, and/or unitary
bit/holder, and the base block bore.
Referring to FIGS. 1-12, a first embodiment of a bit holder 10
comprises a bit holder body 12 and a shank 14 axially depending
from the bottom of the bit holder body 12. The bit holder body 12
is generally annular in shape and comprises an annular or generally
cylindrical upper body portion 16 axially extending from a top
surface 18, such as a flat annular top surface in this first
illustrated embodiment. Subjacent the upper body portion 16 is a
middle portion 20 that extends axially and radially outwardly to a
radially extending generally cylindrical tire portion 22. The
middle portion 20, in this illustrated embodiment, has an arcuate
shape. In other embodiments, the middle portion 20 can have a
frustoconical shape, a convex shape, a concave shape, or an arcuate
shape.
Adjacent the tire portion 22 is a tapered portion 24 (FIG. 3) that
ends in a flange 26 (FIGS. 3, 5, and 6), such as a flat annular
flange, of the bit holder body 12. The tire portion 22 includes at
least a pair of tapered cutouts 28, 30 (FIGS. 1, 5, and 8), or
wedge-shaped undercuts to provide access and leverage for a tool to
extract the bit holder 10 from a base block 70 (FIGS. 5-12). The
tapered cutouts 28, 30 are formed into the tire portion 22 and
extend from the flange 26 subjacent to the tire portion 22. The
tapered cutouts 28, 30 include a pair of parallel flat vertical
inner surfaces 32, 34 (FIGS. 1 and 8), respectively, and a pair of
flat tapered top surfaces 36, 38 (FIGS. 1 and 8), respectively. The
outer edge of the flat tapered top surfaces 36, 38 is each arcuate
in shape to follow the periphery of the tire portion 22. An
interior border of each tapered cutout 28, 30 does not extend to a
plane through the centerline of the bit holder 10 in this
illustrated embodiment. A pair of notches 40, 42 (FIGS. 1, 2, 5,
and 8) are formed into the bit holder body 12 and extend from the
flat annular top surface 18 through the upper body portion 16 and
the middle portion 20, terminating at a point within the middle
portion 20. The notches 40, 42 provide access and leverage for a
tool to extract, or knock out, a bit from the bit holder body
12.
A generally rounded annular or generally cylindrical undercut 44
(FIGS. 5, 6, 8, 9, 11, and 12) extends from the tire portion 22 to
a generally cylindrical or annular first segment 46 of the shank
14. The shank 14 axially depends from the flange 26 of the bit
holder body 12. The bit holder body 12 and the shank 14 are axially
aligned about a bit holder bore 56 (FIGS. 2, 7, and 10-12) that
extends from the flat annular top surface 18 of the bit holder body
12 to a distal end 54 of the shank 14. The first segment 46 of the
shank 14 axially extends from the flange 26 to a second segment 48
that is subjacent to the first segment 46. The second segment 48
can have a generally cylindrical shape, an arcuate shape, or can be
tapered towards the first segment 46 or towards the distal end 54
of the shank 14. A slot 58 extends from an upper termination 60 to
the distal end 54 of the shank 14. Subjacent the second segment 48
is a third segment 50 that axially extends to a decreased diameter
fourth segment 52 adjacent the distal end 54 of the shank 14. The
fourth segment 52 is generally C-shaped when viewed from the distal
end 54.
In this first illustrated embodiment, the third segment 50 of the
shank 14 includes a plurality of ribs 61 and a plurality of notches
or relief zones 62, shown in detail in FIG. 4, which are U-shaped
in this first illustrated embodiment, located between each rib in
the plurality of ribs 61. The plurality of ribs 61 and the
plurality of notches or relief zones 62, in this exemplary
implementation, are disposed solely on an outer surface of the
third segment 50 of the shank 14. The plurality of notches 62
provide reduced surface contact between the third segment 50 and a
complementary portion of a bore 72 (FIG. 7) of the base block 70,
which yields a more evenly distributed and more highly concentrated
force per segment when compared to a bit holder having a shank with
a segment with no material removed, i.e., without a plurality of
notches or relief zones. The base block 70 comprises a base 74 and
receiving portion 76, as shown in FIGS. 6 and 7. The base 74 can be
flat or slightly concave to fit a drum or additional mounting
plates on which a singular or a plurality of base blocks can be
mounted. The receiving portion 76 includes the base block bore 72
that is symmetrical with the shank 14 along a centerline. When
assembled, after insertion of the shank 14 into the bore 72, the
shank 14 of the bit holder 10 forms an interference fit with the
bore 72 of the base block 70.
Referring to FIGS. 13-22, a second embodiment of a bit holder 100
comprises a bit holder body 102 and a shank 104 substantially the
same as the bit holder 10 of the first embodiment. The bit holder
body 102 is generally annular in shape and comprises an annular or
generally cylindrical upper body portion 106 axially extending from
a top surface 108, such as a flat annular top surface in this
second illustrated embodiment. Subjacent the upper body portion 106
is a middle portion 110 that extends axially and radially outwardly
to a radially extending generally cylindrical tire portion 112. The
middle portion 110, in this illustrated embodiment, has an arcuate
shape. In other embodiments, the middle portion 110 can have a
frustoconical shape, a convex shape, a concave shape, or an arcuate
shape.
Adjacent the tire portion 112 is a tapered portion 114 (FIGS. 14
and 18) that ends in a flange 116 (FIGS. 13, 14, 17, and 18), such
as a flat annular flange, of the bit holder body 102. The tire
portion 112 includes at least a pair of tapered cutouts 118, 120
(FIGS. 13, 17, and 20), or wedge-shaped undercuts, to provide
access and leverage for a tool to extract the bit holder 100 from a
base block 160 (FIGS. 17-22). The tapered cutouts 118, 120 are
formed into the tire portion 112 and extend from the flange 116
subjacent to the tire portion 112. The tapered cutouts 118, 120
include a pair of parallel flat vertical inner surfaces 122, 124
(FIGS. 13, 17, and 20), respectively, and a pair of flat tapered
top surfaces 126, 128 (FIGS. 13, 17, and 20), respectively. The
outer edge of the flat tapered top surfaces 126, 128 is each
arcuate in shape to follow the periphery of the tire portion 112.
An interior border of each tapered cutout 118, 120 does not extend
to a plane through the centerline of the bit holder 100 in this
illustrated embodiment. A pair of notches 130, 132 (FIGS. 13, 15,
17, 19, and 20) are formed into the bit holder body 102 and extend
from the flat annular top surface 108 through the upper body
portion 106 and the middle portion 110, terminating at a point
within the middle portion 110. The notches 130, 132 provide access
and leverage for a tool to extract, or knock out, a bit from the
bit holder body 102.
A generally rounded annular or generally cylindrical undercut 134
(FIGS. 14 and 20) extends from the tire portion 112 to a generally
cylindrical or annular first segment 136 of the shank 104. The
shank 104 axially depends from the flange 116 of the bit holder
body 102. The bit holder body 102 and the shank 104 are axially
aligned about a bit holder bore 146 (FIGS. 13-15 and 19-22) that
extends from the flat annular top surface 108 of the bit holder
body 102 to a distal end 144 of the shank 104. The first segment
136 of the shank 104 axially extends from the flange 116 to a
second segment 138 that is subjacent to the first segment 136. The
second segment 138 can have a generally cylindrical shape, an
arcuate shape, or can be tapered towards the first segment 136 or
towards the distal end 144 of the shank 104. A slot 148 extends
from an upper termination 150 to the distal end 144 of the shank
104. Subjacent the second segment 138 is a third segment 140 that
axially extends to a decreased diameter fourth segment 142 adjacent
the distal end 144 of the shank 104. The fourth segment 142 is
generally C-shaped when viewed from the distal end 144.
In this second illustrated embodiment, the third segment 140 of the
shank 104 includes a plurality of ribs 151 and at least one notch
or relief zone 152, shown in detail in FIG. 16, between each rib in
the plurality of ribs 151. The plurality of ribs 151 and the at
least one notches or relief zone 152, in this exemplary
implementation, are disposed solely on an outer surface of the
third segment 140 of the shank 104. The at least one notch or
relief zone 152 provides reduced surface contact between the third
segment 140 and a complementary portion of a bore 162 (FIG. 19) of
the base block 160, which yields a more evenly distributed and more
highly concentrated force per segment when compared to a bit holder
having a shank with a segment with no material removed, i.e.,
without at least one notch or relief zone. The base block 160
comprises a base 164 and receiving portion 166, as shown in FIGS.
18 and 19. The base 164 can be flat or slightly concave to fit a
drum or additional mounting plates on which a singular or a
plurality of base blocks can be mounted. The receiving portion 166
includes the base block bore 162 that is symmetrical with the shank
104 along a centerline. When assembled, after insertion of the
shank 104 into the bore 162, the shank 104 of the bit holder 100
forms an interference fit with the bore 162 of the base block
160.
Referring to FIGS. 23-33, a third embodiment of a bit holder 200
comprises a bit holder body 202 and a shank 204 substantially the
same as the bit holder 10 of the first embodiment. The bit holder
body 202 is generally annular in shape and comprises an annular or
generally cylindrical upper body portion 206 axially extending from
a top surface 208, such as a flat annular top surface in this third
illustrated embodiment. Subjacent the upper body portion 206 is a
middle portion 210 that extends axially and radially outwardly to a
radially extending generally cylindrical tire portion 212. The
middle portion 210, in this illustrated embodiment, has an arcuate
shape. In other embodiments, the middle portion 210 can have a
frustoconical shape, a convex shape, a concave shape, or an arcuate
shape.
Adjacent the tire portion 212 is a tapered portion 214 (FIGS. 24
and 29) that ends in a flange 216 (FIGS. 24 and 29), such as a flat
annular flange, of the bit holder body 202. The tire portion 212
includes at least a pair of tapered cutouts 218, 220 (FIGS. 23, 28,
and 31), or wedge-shaped undercuts, to provide access and leverage
for a tool to extract the bit holder 200 from a base block 260
(FIGS. 28-33). The tapered cutouts 218, 220 are formed into the
tire portion 212 and extend from the flange 216 subjacent to the
tire portion 212. The tapered cutouts 218, 220 include a pair of
parallel flat vertical inner surfaces 222, 224 (FIGS. 23, 28, and
31), respectively, and a pair of flat tapered top surfaces 226, 228
(FIGS. 23, 28, and 31), respectively. The outer edge of the flat
tapered top surfaces 226, 228 is each arcuate in shape to follow
the periphery of the tire portion 212. An interior border of each
tapered cutout 218, 220 does not extend to a plane through the
centerline of the bit holder 200 in this illustrated embodiment. A
pair of notches 230, 232 (FIGS. 23, 26, 28, 30, and 31) are formed
into the bit holder body 202 and extend from the flat annular top
surface 208 through the upper body portion 206 and the middle
portion 210, terminating at a point within the middle portion 210.
The notches 230, 232 provide access and leverage for a tool to
extract, or knock out, a bit from the bit holder body 202.
A generally rounded annular or generally cylindrical undercut 234
(FIGS. 31 and 32) extends from the tire portion 212 to a generally
cylindrical or annular first segment 236 of the shank 204. The
shank 204 axially depends from the flange 216 of the bit holder
body 202. The bit holder body 202 and the shank 204 are axially
aligned about a bit holder bore 246 (FIGS. 26 and 30-33) that
extends from the flat annular top surface 208 of the bit holder
body 202 to a distal end 244 of the shank 204. The first segment
236 of the shank 204 axially extends from the flange 216 to a
second segment 238 that is subjacent to the first segment 236. The
second segment 238 can have a generally cylindrical shape, an
arcuate shape, or can be tapered towards the first segment 236 or
towards the distal end 244 of the shank 204. A slot 248 extends
from an upper termination 250 to the distal end 244 of the shank
204. Subjacent the second segment 238 is a third segment 240 that
axially extends to a decreased diameter fourth segment 242 adjacent
the distal end 244 of the shank 204. The fourth segment 242 is
generally C-shaped when viewed from the distal end 244.
In this third illustrated embodiment, the third segment 240 of the
shank 204 includes a plurality of ribs 251 and a plurality of
notches or relief zones 252, shown in detail in FIGS. 25 and 27,
between each rib in the plurality of ribs 251. The plurality of
ribs 251 and the plurality of notches or relief zones 252, in this
exemplary implementation, are disposed solely on an outer surface
of the third segment 240 of the shank 204. The edges or sides of
each rib in the plurality of ribs 251 are disposed at an acute
angle, in this embodiment, to a plane through the centerline of the
bit holder 200. In other embodiments the edges or sides of each rib
in the plurality of ribs 251 can be disposed at an obtuse angle to
or perpendicular to a plane through the centerline of the bit
holder 200. The plurality of notches 252 provide reduced surface
contact between the third segment 240 and a complementary portion
of a bore 262 (FIG. 30) of the base block 260, which yields a more
evenly distributed and more highly concentrated force per segment
when compared to a bit holder having a shank with a segment with no
material removed, i.e., without at least one notch or relief zone.
The base block 260 comprises a base 264 and receiving portion 266,
as shown in FIGS. 29 and 30. The base 264 can be flat or slightly
concave to fit a drum or additional mounting plates on which a
singular or a plurality of base blocks can be mounted. The
receiving portion 266 includes the base block bore 262 that is
symmetrical with the shank 204 along a centerline. When assembled,
after insertion of the shank 204 into the bore 262, the shank 204
of the bit holder 200 forms an interference fit with the bore 262
of the base block 260.
Referring to FIGS. 34-44, a fourth embodiment of a bit holder 300
comprises a bit holder body 302 and a shank 304 axially depending
from the bottom of the bit holder body 302. The bit holder body 302
is generally annular in shape and comprises an annular or generally
cylindrical upper body portion 306 axially extending from a top
surface 308, such as a flat annular top surface in this fourth
illustrated embodiment. Subjacent the upper body portion 306 is a
middle portion 310 that extends axially and radially outwardly to a
radially extending generally cylindrical tire portion 312. The
middle portion 310, in this illustrated embodiment, has an arcuate
shape. In other embodiments, the middle portion 310 can have a
frustoconical shape, a convex shape, a concave shape, or an arcuate
shape.
Adjacent the tire portion 312 is a tapered portion 314 (FIGS. 35
and 40) that ends in a flange 316 (FIGS. 35, 39, and 40), such as a
flat annular flange, of the bit holder body 302. The tire portion
312 includes at least a pair of tapered cutouts 318, 320 (FIGS. 34,
39, and 42), or wedge-shaped undercuts to provide access and
leverage for a tool to extract the bit holder 300 from a base block
360 (FIGS. 39-44). The tapered cutouts 318, 320 are formed into the
tire portion 312 and extend from the flange 316 subjacent to the
tire portion 312. The tapered cutouts 318, 320 include a pair of
parallel flat vertical inner surfaces 322, 324 (FIGS. 34, 39, and
42), respectively, and a pair of flat tapered top surfaces 326, 328
(FIGS. 34, 39, and 42), respectively. The outer edge of the flat
tapered top surfaces 326, 328 is each arcuate in shape to follow
the periphery of the tire portion 312. An interior border of each
tapered cutout 318, 320 does not extend to a plane through the
centerline of the bit holder 300 in this illustrated embodiment. A
pair of notches 330, 332 (FIGS. 34, 39, 41, and 42) are formed into
the bit holder body 302 and extend from the flat annular top
surface 308 through the upper body portion 306 and the middle
portion 310, terminating at a point within the middle portion 310.
The notches 330, 332 provide access and leverage for a tool to
extract, or knock out, a bit from the bit holder body 302.
A generally rounded annular or generally cylindrical undercut 334
(FIGS. 42 and 43) extends from the tire portion 312 to a generally
cylindrical or annular increased diameter first segment 336 of the
shank 304. The shank 304 axially depends from the flange 316 of the
bit holder body 302. The bit holder body 302 and the shank 304 are
axially aligned about a bit holder bore 346 (FIGS. 37 and 41-44)
that extends from the flat annular top surface 308 of the bit
holder body 302 to a distal end 344 of the shank 304. The first
segment 336 of the shank 304 axially extends from the flange 316 to
a shoulder 337 that is subjacent to the first segment 336. A
decreased diameter second segment 338, subjacent the shoulder 337,
axially extends to an increased diameter third segment 340. The
second segment 338 can have a generally cylindrical shape, an
arcuate shape, or can be tapered towards the first segment 336 or
towards the distal end 344 of the shank 304. A slot 348 extends
from an upper termination 350 to the distal end 344 of the shank
304. A decreased diameter fourth segment 342 axially extends from
the third segment 340 to a location adjacent the distal end 344 of
the shank 304. The fourth segment 342 is generally C-shaped when
viewed from the distal end 344.
In this fourth illustrated embodiment, the third segment 340 of the
shank 304 includes a plurality of ribs 351 and a plurality of
notches or relief zones 352, shown in detail in FIGS. 36 and 38,
which are U-shaped in this fourth illustrated embodiment, located
between each rib in the plurality of ribs 351. The plurality of
ribs 351 and the plurality of notches or relief zones 352, in this
exemplary implementation, are disposed solely on an outer surface
of the third segment 340 of the shank 304. The plurality of notches
352 provide reduced surface contact between the third segment 340
and a complementary portion of a bore 362 (FIG. 41) of the base
block 360, which yields a more evenly distributed and more highly
concentrated force per segment when compared to a bit holder having
a shank with a segment with no material removed, i.e., without a
plurality of notches or relief zones. The base block 360 comprises
a base 364 and receiving portion 366, as shown in FIGS. 40 and 41.
The base 364 can be flat or slightly concave to fit a drum or
additional mounting plates on which a singular or a plurality of
base blocks can be mounted. The receiving portion 366 includes the
base block bore 362 that is symmetrical with the shank 304 along a
centerline. When assembled, after insertion of the shank 304 into
the bore 362, the shank 304 of the bit holder 300 forms an
interference fit with the bore 362 of the base block 360.
Bits and their respective bit holders may be combined into a
unitary structure. A first illustrated embodiment of a unitary
bit/holder 370, shown in FIGS. 67-70, comprises the fourth
illustrated embodiment of the bit holder 300 and a bit 372 which
are assembled together into a unitary structure to form the unitary
bit/holder 370. In other embodiments, the unitary bit/holder 370
may comprise the first illustrated embodiment of the bit holder 10,
the second illustrated embodiment of the bit holder 100, the third
illustrated embodiment of the bit holder 200, the fifth illustrated
embodiment of the bit holder 400, or the sixth illustrated
embodiment of the bit holder 500 assembled together with the bit
372 to form the unitary structure of the into a unitary bit/holder.
All these members are brazed in their respective recesses to form a
generally unitary bit/holder that fits in a bit holder block bore.
The unitary bit/holder 370 of this first illustrated embodiment is
then assembled into the base block 360, which comprises insertion
of the shank 304 into the bore 362 of the base block 360, forming
an interference fit between the shank 304 of the bit holder 300 and
the bore 362 of the base block 360. In other embodiments, the
unitary bit/holder may be assembled into the base block 70, base
block 160, base block 260, base block 460, or base block 560.
Referring to FIGS. 45-55, a fifth embodiment of a bit holder 400
comprises a bit holder body 402 and a shank 404 substantially the
same as the bit holder 300 of the fourth embodiment. The bit holder
body 402 is generally annular in shape and comprises an annular or
generally cylindrical upper body portion 406 axially extending from
a top surface 408, such as a flat annular top surface in this fifth
illustrated embodiment. Subjacent the upper body portion 406 is a
middle portion 410 that extends axially and radially outwardly to a
radially extending generally cylindrical tire portion 412. The
middle portion 410, in this illustrated embodiment, has an arcuate
shape. In other embodiments, the middle portion 410 can have a
frustoconical shape, a convex shape, a concave shape, or an arcuate
shape.
Adjacent the tire portion 412 is a tapered portion 414 (FIGS. 46
and 51) that ends in a flange 416 (FIGS. 45, 46, 50, and 51), such
as a flat annular flange, of the bit holder body 402. The tire
portion 412 includes at least a pair of tapered cutouts 418, 420
(FIGS. 45, 50, and 53), or wedge-shaped undercuts to provide access
and leverage for a tool to extract the bit holder 400 from a base
block 460 (FIGS. 50-55). The tapered cutouts 418, 420 are formed
into the tire portion 412 and extend from the flange 416 subjacent
to the tire portion 412. The tapered cutouts 418, 420 include a
pair of parallel flat vertical inner surfaces 422, 424 (FIGS. 45,
50, and 53), respectively, and a pair of flat tapered top surfaces
426, 428 (FIGS. 45, 50, and 53), respectively. The outer edge of
the flat tapered top surfaces 426, 428 is each arcuate in shape to
follow the periphery of the tire portion 412. An interior border of
each tapered cutout 418, 420 does not extend to a plane through the
centerline of the bit holder 400 in this illustrated embodiment. A
pair of notches 430, 432 (FIGS. 45, 48, 50, 52, 53, and 55) are
formed into the bit holder body 402 and extend from the flat
annular top surface 408 through the upper body portion 406 and the
middle portion 410, terminating at a point within the middle
portion 410. The notches 430, 432 provide access and leverage for a
tool to extract, or knock out, a bit from the bit holder body
402.
A generally rounded annular or generally cylindrical undercut 434
(FIGS. 53 and 54) extends from the tire portion 412 to a generally
cylindrical or annular increased diameter first segment 436 of the
shank 404. The shank 404 axially depends from the flange 416 of the
hit holder body 402. The bit holder body 402 and the shank 404 are
axially aligned about a bit holder bore 446 (FIGS. 48 and 52-55)
that extends from the flat annular top surface 408 of the bit
holder body 402 to a distal end 444 of the shank 404. The first
segment 436 of the shank 404 axially extends from the flange 416 to
a shoulder 437 that is subjacent to the first segment 436. A
decreased diameter second segment 438, subjacent the shoulder 437,
axially extends to an increased diameter third segment 440. The
second segment 438 can have a generally cylindrical shape, an
arcuate shape, or can be tapered towards the first segment 436 or
towards the distal end 444 of the shank 404. A slot 448 extends
from an upper termination 450 to the distal end 444 of the shank
404. A decreased diameter fourth segment 442 axially extends from
the third segment 440 to a location adjacent the distal end 444 of
the shank 404. The fourth segment 442 is generally C-shaped when
viewed from the distal end 444.
In this fifth illustrated embodiment, the third segment 440 of the
shank 404 includes a plurality of ribs 451 and at least one notch
or relief zone 452, shown in detail in FIGS. 47 and 49, between
each rib in the plurality of ribs 451. The plurality of ribs 451
and the at least one notches or relief zone 452, in this exemplary
implementation, are disposed solely on an outer surface of the
third segment 440 of the shank 404. The at least one notch or
relief zone 452 provides reduced surface contact between the third
segment 440 and a complementary portion of a bore 462 (FIG. 52) of
the base block 460, which yields a more evenly distributed and more
highly concentrated force per segment when compared to a bit holder
having a shank with a segment with no material removed, i.e.,
without a plurality of notches or relief zones. The base block 460
comprises a base 464 and receiving portion 466, as shown in FIGS.
51 and 52. The base 464 can be flat or slightly concave to fit a
drum or additional mounting plates on which a singular or a
plurality of base blocks can be mounted. The receiving portion 466
includes the base block bore 462 that is symmetrical with the shank
404 along a centerline. When assembled, after insertion of the
shank 404 into the bore 462, the shank 404 of the bit holder 400
forms an interference fit with the bore 462 of the base block
460.
Referring to FIGS. 56-66, a sixth embodiment of a bit holder 500
comprises a bit holder body 502 and a shank 504 substantially the
same as the bit holder 300 of the fourth embodiment. The bit holder
body 502 is generally annular in shape and comprises an annular or
generally cylindrical upper body portion 506 axially extending from
a top surface 508, such as a flat annular top surface in this sixth
illustrated embodiment. Subjacent the upper body portion 506 is a
middle portion 510 that extends axially and radially outwardly to a
radially extending generally cylindrical tire portion 512. The
middle portion 510, in this illustrated embodiment, has an arcuate
shape. In other embodiments, the middle portion 510 can have a
frustoconical shape, a convex shape, a concave shape, or an arcuate
shape.
Adjacent the tire portion 512 is a tapered portion 514 (FIGS. 57
and 62) that ends in a flange 516 (FIGS. 57, 61, and 62), such as a
flat annular flange, of the bit holder body 502. The tire portion
512 includes at least a pair of tapered cutouts 518, 520 (FIGS. 56,
61, and 64), or wedge-shaped undercuts to provide access and
leverage for a tool to extract the bit holder 500 from a base block
560 (FIGS. 61-66). The tapered cutouts 518, 520 are formed into the
tire portion 512 and extend from the flange 516 subjacent to the
tire portion 512. The tapered cutouts 518, 520 include a pair of
parallel flat vertical inner surfaces 522, 524 (FIGS. 56, 61, and
64), respectively, and a pair of flat tapered top surfaces 526, 528
(FIGS. 56, 61, and 64), respectively. The outer edge of the flat
tapered top surfaces 526, 528 is each arcuate in shape to follow
the periphery of the tire portion 512. An interior border of each
tapered cutout 518, 520 does not extend to a plane through the
centerline of the bit holder 500 in this illustrated embodiment. A
pair of notches 530, 532 (FIGS. 56, 59, 61, 63, 64, and 66) are
formed into the bit holder body 502 and extend from the flat
annular top surface 508 through the upper body portion 506 and the
middle portion 510, terminating at a point within the middle
portion 510. The notches 530, 532 provide access and leverage for a
tool to extract, or knock out, a bit from the bit holder body
502.
A generally rounded annular or generally cylindrical undercut 534
(FIGS. 64 and 65) extends from the tire portion 512 to a generally
cylindrical or annular increased diameter first segment 536 of the
shank 504. The shank 504 axially depends from the flange 516 of the
bit holder body 502. The bit holder body 502 and the shank 504 are
axially aligned about a bit holder bore 546 (FIGS. 59 and 63-66)
that extends from the flat annular top surface 508 of the bit
holder body 502 to a distal end 544 of the shank 504. The first
segment 536 of the shank 504 axially extends from the flange 516 to
a shoulder 537 that is subjacent to the first segment 536. A
decreased diameter second segment 538, subjacent the shoulder 537,
axially extends to an increased diameter third segment 540. The
second segment 538 can have a generally cylindrical shape, an
arcuate shape, or can be tapered towards the first segment 536 or
towards the distal end 544 of the shank 504. A slot 548 extends
from an upper termination 550 to the distal end 544 of the shank
504. A decreased diameter fourth segment 542 axially extends from
the third segment 540 to a location adjacent the distal end 544 of
the shank 504. The fourth segment 542 is generally C-shaped when
viewed from the distal end 544.
In this sixth illustrated embodiment, the third segment 540 of the
shank 504 includes a plurality of ribs 551 and a plurality of
notches or relief zones 552, shown in detail in FIGS. 58 and 60,
between each rib in the plurality of ribs 551. The plurality of
ribs 551 and the plurality of notches or relief zones 552, in this
exemplary implementation, are disposed solely on an outer surface
of the third segment 540 of the shank 504. The edges or sides of
each rib in the plurality of ribs 551 are disposed at an acute
angle, in this embodiment, to a plane through the centerline of the
bit holder 500. In other embodiments the edges or sides of each rib
in the plurality of ribs 551 can be disposed at an obtuse angle to
or perpendicular to a plane through the centerline of the bit
holder 500. The plurality of notches 552 provide reduced surface
contact between the third segment 540 and a complementary portion
of a bore 562 (FIG. 63) of the base block 560, which yields a more
evenly distributed and more highly concentrated force per segment
when compared to a bit holder having a shank with a segment with no
material removed, i.e., without a plurality of notches or relief
zones. The base block 560 comprises a base 564 and receiving
portion 566, as shown in FIGS. 62 and 63. The base 564 can be flat
or slightly concave to fit a drum or additional mounting plates on
which a singular or a plurality of base blocks can be mounted. The
receiving portion 566 includes the base block bore 562 that is
symmetrical with the shank 504 along a centerline. When assembled,
after insertion of the shank 504 into the bore 562, the shank 504
of the bit holder 500 forms an interference fit with the bore 562
of the base block 560.
As used in this application, the term "or" is intended to mean an
inclusive "or" rather than an exclusive "or". That is, unless
specified otherwise, or clear from context, "X includes A or B" is
intended to mean any of the natural inclusive permutations. That
is, if X includes A; X includes B; or X includes both A and B, then
"X includes A or B" is satisfied under any of the foregoing
instances. In addition, "X includes at least one of A and B" is
intended to mean any of the natural inclusive permutations. That
is, if X includes A; X includes B; or X includes both A and B, then
"X includes at least one of A and B" is satisfied under any of the
foregoing instances. The articles "a" and "an" as used in this
application and the appended claims should generally be construed
to mean "one or more" unless specified otherwise or clear from
context to be directed to a singular form. Moreover, use of the
term "an implementation" or "one implementation" throughout is not
intended to mean the same embodiment, aspect or implementation
unless described as such.
While the present disclosure has been described in connection with
certain embodiments, it is to be understood that the invention is
not to be limited to the disclosed embodiments but, on the
contrary, is intended to cover various modifications and equivalent
arrangements included within the scope of the appended claims,
which scope is to be accorded the broadest interpretation so as to
encompass all such modifications and equivalent structures as is
permitted under the law.
* * * * *