U.S. patent application number 17/712868 was filed with the patent office on 2022-07-14 for handheld punch tool.
The applicant listed for this patent is MILWAUKEE ELECTRIC TOOL CORPORATION. Invention is credited to William E. Street, James Wekwert.
Application Number | 20220219251 17/712868 |
Document ID | / |
Family ID | 1000006242058 |
Filed Date | 2022-07-14 |
United States Patent
Application |
20220219251 |
Kind Code |
A1 |
Street; William E. ; et
al. |
July 14, 2022 |
HANDHELD PUNCH TOOL
Abstract
A handheld punch tool includes a housing defining a first axis,
a motor contained within the housing, the motor having a motor
shaft defining a second axis, and a head coupled to the housing.
The head including a drive member reciprocable along a third axis
in response to rotation of the motor shaft about the second axis,
and a punch coupled to the drive member and reciprocable in
response to reciprocation of the drive member along the third axis.
The handheld punch tool further includes a debris collection
container removably coupled to the head. The debris collection
container is configured to receive chips generated during operation
of the handheld punch tool.
Inventors: |
Street; William E.;
(Richfield, WI) ; Wekwert; James; (Wauwatosa,
WI) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
MILWAUKEE ELECTRIC TOOL CORPORATION |
Brookfield |
WI |
US |
|
|
Family ID: |
1000006242058 |
Appl. No.: |
17/712868 |
Filed: |
April 4, 2022 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
16054343 |
Aug 3, 2018 |
11292067 |
|
|
17712868 |
|
|
|
|
62541165 |
Aug 4, 2017 |
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B21D 28/26 20130101;
B21D 28/12 20130101; B23D 27/04 20130101; B23D 15/12 20130101 |
International
Class: |
B23D 27/04 20060101
B23D027/04; B21D 28/26 20060101 B21D028/26; B23D 15/12 20060101
B23D015/12 |
Claims
1. A handheld punch tool comprising: a housing defining a first
axis; a motor contained within the housing, the motor having a
motor shaft defining a second axis; a head coupled to the housing,
the head including a drive member reciprocable along a third axis
in response to rotation of the motor shaft about the second axis,
and a punch coupled to the drive member and reciprocable in
response to reciprocation of the drive member along the third axis;
and a debris collection container removably coupled to the head,
the debris collection container configured to receive chips
generated during operation of the handheld punch tool.
2. The handheld punch tool of claim 1, wherein the head includes a
die having a passageway within which the punch is reciprocable,
wherein the die includes a first opening in communication with the
passageway and a second opening in communication with the
passageway, and wherein the debris collection container is
removably coupled to the head in one of a first position in which
the debris collection container is configured to receive chips
through the first opening, or a second position in which the debris
collection container is configured to receive chips through the
second opening.
3. The handheld punch tool of claim 2, wherein the first opening
and the second opening are disposed on opposite sides of the
die.
4. The handheld punch tool of claim 2, further comprising a plug
removably coupled to the first opening when the debris collection
container is in the second position and to the second opening when
the debris collection container is in the first position.
5. The handheld punch tool of claim 1, wherein the head is
rotatable relative to the housing about the third axis with the
debris collection container coupled to the head.
6. The handheld punch tool of claim 1, wherein the housing includes
a battery receptacle, wherein the handheld punch tool further
comprises a battery pack at least partially insertable into the
battery receptacle along the first axis to couple the battery pack
to the battery receptacle, and wherein the battery pack is
configured to supply power to the motor.
7. The handheld punch tool of claim 1, further comprising a drive
assembly coupling the motor shaft to the drive member, wherein the
drive assembly is disposed axially between the motor and the head
along the second axis.
8. The handheld punch tool of claim 1, wherein the debris
collection container includes one or more magnets configured to
attract chips into the container.
9. A handheld punch tool comprising: a housing defining a first
axis; a motor contained within the housing, the motor having a
motor shaft defining a second axis; a head coupled to the housing,
the head including a drive member reciprocable along a third axis
in response to rotation of the motor shaft about the second axis,
and a punch coupled to the drive member and reciprocable in
response to reciprocation of the drive member along the third axis;
and a debris collection container configured to be removably
coupled to the head in a first position and a second position, the
debris collection container configured to receive chips generated
during operation of the handheld punch tool in each of the first
position and the second position.
10. The handheld punch tool of claim 9, wherein the head includes a
die having a passageway within which the punch is reciprocable,
wherein the die includes a first opening in communication with the
passageway and a second opening in communication with the
passageway, and wherein the debris collection container is
configured to receive chips through the first opening in the first
position and through the second opening in the second position.
11. The handheld punch tool of claim 10, wherein the first opening
and the second opening are disposed on opposite sides of the
die.
12. The handheld punch tool of claim 9, wherein the housing
includes a battery receptacle, wherein the handheld punch tool
further comprises a battery pack at least partially insertable into
the battery receptacle along the first axis to couple the battery
pack to the battery receptacle, and wherein the battery pack is
configured to supply power to the motor.
13. The handheld punch tool of claim 9, further comprising a drive
assembly coupling the motor shaft to the drive member, wherein the
drive assembly is disposed axially between the motor and the head
along the second axis.
14. The handheld punch tool of claim 9, wherein the debris
collection container includes one or more magnets configured to
attract chips into the container.
15. A handheld punch tool comprising: a housing defining a first
axis; a motor contained within the housing, the motor having a
motor shaft defining a second axis; a head coupled to the housing,
the head including a drive member reciprocable along a third axis
in response to rotation of the motor shaft about the second axis,
and a punch coupled to the drive member and reciprocable in
response to reciprocation of the drive member along the third axis;
and a debris collection container configured to receive chips
generated during operation of the handheld punch tool, wherein the
head is rotatable relative to the housing about the third axis, and
wherein the debris collection container is rotatable with the head
about the third axis.
16. The handheld punch tool of claim 15, wherein the debris
collection container is removably coupled to the head.
17. The handheld punch tool of claim 16, wherein the head includes
a die having a passageway within which the punch is reciprocable,
wherein the die includes a first opening in communication with the
passageway and a second opening in communication with the
passageway, and wherein the debris collection container is
removably coupled to the head each of a first position in which the
debris collection container is configured to receive chips through
the first opening, and a second position in which the debris
collection container is configured to receive chips through the
second opening.
18. The handheld punch tool of claim 17, wherein the first opening
and the second opening are disposed on opposite sides of the
die.
19. The handheld punch tool of claim 15, wherein the debris
collection container includes one or more magnets configured to
attract chips into the container.
20. The handheld punch tool of claim 15, wherein the housing
includes a battery receptacle, wherein the handheld punch tool
further comprises a battery pack at least partially insertable into
the battery receptacle along the first axis to couple the battery
pack to the battery receptacle, and wherein the battery pack is
configured to supply power to the motor.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application is a division of co-pending U.S.
patent application Ser. No. 16/054,343, filed on Aug. 3, 2018,
issued as U.S. Pat. No. 11,292,067, which claims priority to U.S.
Provisional Patent Application No. 62/541,165, filed on Aug. 4,
2017, the entire content of each of which is incorporated herein by
reference.
FIELD OF THE INVENTION
[0002] The present invention relates to power tools, and more
specifically to handheld punch tools.
BACKGROUND OF THE INVENTION
[0003] Handheld reciprocating punch tools, also known as nibblers,
operate by rapidly reciprocating a punch to cut through sheet
metal, such as ductwork. Although nibblers are generally efficient
and accurate tools for cutting through sheet metal, typical
nibblers eject numerous small fragments during a cutting operation.
These fragments can be sharp and difficult to clean up. In
addition, typical nibblers are powered by an AC power source or
compressed air, requiring a power cord or air hose that limits
access and maneuverability. Finally, typical nibblers can only
begin a cut on an edge. In other words, typical nibblers are not
able to begin a cut in the middle of a sheet or on a closed duct,
for example.
SUMMARY OF THE INVENTION
[0004] The present invention provides, in one aspect, a handheld
punch tool including a housing defining a first axis, a motor
contained within the housing, the motor having a motor shaft
defining a second axis, and a head coupled to the housing. The head
including a drive member reciprocable along a third axis in
response to rotation of the motor shaft about the second axis, and
a punch coupled to the drive member and reciprocable in response to
reciprocation of the drive member along the third axis. The
handheld punch tool further includes a debris collection container
removably coupled to the head. The debris collection container
configured to receive chips generated during operation of the
handheld punch tool.
[0005] The present invention provides, in another aspect, a
handheld punch tool including a housing defining a first axis, a
motor contained within the housing, the motor having a motor shaft
defining a second axis, and a head coupled to the housing. The head
including a drive member reciprocable along a third axis in
response to rotation of the motor shaft about the second axis, and
a punch coupled to the drive member and reciprocable in response to
reciprocation of the drive member along the third axis. The
handheld punch tool further includes a debris collection configured
to be removably coupled to the head in a first position and a
second position, the debris collection container configured to
receive chips generated during operation of the handheld punch tool
in each of the first position and the second position.
[0006] The present invention provides, in yet another aspect, a
handheld punch tool including a housing defining a first axis, a
motor contained within the housing, the motor having a motor shaft
defining a second axis, and a head coupled to the housing. The head
including a drive member reciprocable along a third axis in
response to rotation of the motor about the second axis, and a
punch coupled to the drive member and reciprocable in response to
reciprocation of the drive member along the third axis. The
handheld punch tool further includes a debris collection container
configured to receive chips generated during operation of the
handheld punch tool. The head is rotatable relative to the housing
about the third axis, and the debris collection container is
rotatable with the head about the third axis.
[0007] Other features and aspects of the invention will become
apparent by consideration of the following detailed description and
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] FIG. 1 is a perspective view of a punch tool according to an
embodiment of the invention.
[0009] FIG. 2 is a side view illustrating a head of the punch tool
of FIG. 1.
[0010] FIG. 3 is a cross-sectional view, taken along line 3-3 in
FIG. 1, illustrating a drive assembly of the punch tool.
[0011] FIG. 4 is a cross-sectional view of the head of the punch
tool of FIG. 1.
[0012] FIG. 5 is an enlarged cross-sectional view illustrating a
debris collection container coupled to the head of the punch tool
of FIG. 1.
[0013] Before any embodiments of the invention are explained in
detail, it is to be understood that the invention is not limited in
its application to the details of construction and the arrangement
of components set forth in the following description or illustrated
in the following drawings. The invention is capable of other
embodiments and of being practiced or of being carried out in
various ways. Also, it is to be understood that the phraseology and
terminology used herein is for the purpose of description and
should not be regarded as limiting.
DETAILED DESCRIPTION
[0014] FIG. 1 illustrates a handheld punch tool or nibbler 10
including a housing 14, an electric motor 16 supported within the
housing 14, a cutting head 18 coupled to a front portion of the
housing 14, and a battery pack 22 for supplying power to the motor
16 for operating the cutting head 18. The illustrated battery pack
22 is a rechargeable battery pack with a plurality of lithium-based
cells. The battery pack 22 may have a nominal output voltage of
about 12 Volts. In other embodiments, the battery pack 22 may have
other nominal output voltages (e.g., about 18 Volts or more). The
features and advantages of the nibbler 10 according to the present
disclosure may also be applied to corded nibblers or pneumatic
nibblers, however.
[0015] With continued reference to FIG. 1, the housing 14 defines a
first axis or housing axis 26, which is a longitudinal axis that
extends centrally through the housing 14 along its length. The
battery pack 22 is partially insertable into a battery receptacle
30 located at a rear portion of the housing 14, opposite the
cutting head 18. In the illustrated embodiment, the battery pack 22
is insertable into the battery receptacle 30 along the first axis
26 to couple the battery pack 22 to the battery receptacle 30. This
arrangement provides the nibbler 10 with a compact, in-line
arrangement that facilitates use of the nibbler 10 in tight
spaces.
[0016] The illustrated housing 14 includes first and second
cooperating clamshell halves 38a, 38b that define a handle portion
42 (i.e. a portion of the housing 14 configured to be grasped by an
operator during operation of the nibbler 10) having a generally
cylindrical shape. The housing axis 26 extends centrally through
the handle portion 42. However, the housing 14 may have a variety
of other constructions such that the housing axis 26 may not extend
through the handle portion 42. For example, the housing 14 may be
generally 1' or `T` shaped with the handle portion 42 formed as a
pistol grip. In such embodiments, the housing axis 26 may not
extend through the handle portion 42 but rather may extend through
another portion of the housing 14 containing the motor 16.
[0017] In the illustrated embodiment, an on/off switch 46 is
located on the handle portion 42 for selectively electrically
connecting the motor 16 and the battery pack 22 to provide DC power
to the motor 16. In some embodiments, the on/off switch 46 may be a
variable speed switch. The motor 16 has a motor shaft 50 that is
rotatable about a second axis or motor axis 54. The motor 16 is
preferably oriented such that the motor axis 54 is coaxial with the
housing axis 26. As such, relationships described herein with
reference to the motor axis 54 are equally applicable to the
housing axis 26, and vice versa. However, it is contemplated that
in other embodiments, the motor axis 54 and the housing axis 26 may
not be coaxial.
[0018] Referring to FIG. 3, the nibbler 10 also includes a drive
assembly 58 positioned between the motor 16 (FIG. 1) and the
cutting head 18 along the housing axis 26. The drive assembly 58 is
at least partially contained within a drive housing portion 60 of
the housing 14. The drive assembly 58 includes an input member or
input shaft 62 that receives torque from the motor shaft 50, an
intermediate member or intermediate shaft 66 driven by the input
shaft 62, and an output member or output shaft 70 driven by the
intermediate shaft 66. The input shaft 62 and the output shaft 70
are coaxial with the motor axis 54 in the illustrated embodiment;
however, in other embodiments, the input shaft 62 and the output
shaft 70 may be parallel to the motor axis 54. The intermediate
shaft 66 extends transverse to the motor axis 54.
[0019] The input shaft 62 may be coupled to the motor shaft 50 via
a transmission (e.g., a single or multi-stage planetary
transmission; not shown) or gear reduction, or the input shaft 62
may be directly driven by the motor shaft 50. Alternatively, the
input shaft 62 and the motor shaft 50 may be integrally formed
together as a single component. The input shaft 62 includes an
input pinion 74 meshed with an intermediate ring gear 78 that is
supported on the intermediate shaft 66. The output shaft 70
includes an output pinion 82 meshed with the intermediate ring gear
78. The intermediate ring gear 78 is thus disposed between the
input pinion 74 and the output pinion 82 to transmit torque from
the input pinion 74 to the output pinion 82.
[0020] With continued reference to FIG. 3, the illustrated drive
assembly 58 further includes an eccentric 86 for providing a
reciprocating input to the cutting head 18. The eccentric 86
includes a yoke 90 pivotally coupled to the output shaft 70 by an
eccentric pin 94. The opposite end of the yoke 90 is pivotally
coupled to a drive member or drive rod 98 of the cutting head 18.
Rotation of the output shaft 70 thus causes reciprocation of the
drive rod 98 along a third axis 102. In the illustrated embodiment,
the third axis 102 is transverse to the first and second axes 26,
54; however, the orientation of the third axis 102 may vary in
other embodiments. A counterweight 104 is fixed to the output shaft
70 to balance radial forces on the output shaft 70 generated by the
reciprocating drive rod 98. The counterweight 104 thus reduces
vibration in the drive assembly 58.
[0021] With reference to FIGS. 2 and 3, the cutting head 18 is
coupled to the housing 14 by a swivel joint 106 to permit
adjustment of the orientation of the cutting head 18 relative to
the housing 14 about the third (swivel) axis 102, thereby making
the cutting head 18 omnidirectional. In other words, the
orientation of the cutting head 18 may be adjusted, while
maintaining the position of the housing 14, to change the cutting
direction of the cutting head 18. The perpendicular orientation of
the swivel axis 102 relative to the housing axis 26 and the
omnidirectional cutting head 18 advantageously allow the nibbler 10
to make more precise cuts in smaller spaces compared to typical
nibblers. In addition, the nibbler 10 advantageously allows an
operator to make cuts in spaces with limited access.
[0022] Referring to FIG. 4, the cutting head 18 includes a main
body 108 that houses a clamp assembly 110. The clamp assembly 110
is coupled to the drive rod 98 opposite the eccentric 86. In the
illustrated embodiment, the clamp assembly 110 is coupled to the
drive rod 98 via a C-shaped clip 114, which is seated in a groove
118 proximate a distal end of the drive rod 98. The engagement
between the C-shaped clip 114 and the groove 118 axially secures
the clamp assembly 110 to the drive rod 98 while permitting the
clamp assembly 110 to rotate about the drive rod 98 when the
cutting head 18 is rotated relative to the housing 14 about the
swivel joint 106. In the illustrated embodiment, a first set screw
122 bears against the C-shaped clip 114 to maintain the clip 114 in
the groove 118. In other embodiments, the clamp assembly 110 may be
coupled for reciprocation with the drive rod 98 in other ways that
permit rotation of the clamp assembly 110 about the drive rod
98.
[0023] With continued reference to FIG. 4, the clamp assembly 110
includes a clamping recess 126 that receives a punch 130. A second
set screw 134 secures the punch 130 within the recess 126 to
removably couple the punch 130 to the clamp assembly 110. The punch
130 can thus be conveniently removed and replaced when worn, or to
substitute the punch 130 for a punch having a different size or
geometry. The cutting head 18 also includes a die 138 removably
coupled to the main body 108 by a third set screw 142. Thus, the
die 138, like the punch 130, can be conveniently removed and
replaced when worn, or to substitute the die 138 for a die having a
different size or geometry. The die 138 defines a passageway 146
through which the punch 130 reciprocates in response to
reciprocation of the drive rod 98 and clamp assembly 110. The punch
130 is reciprocable along a fourth axis or punch axis 150 which, in
the illustrated embodiment, is parallel to the third axis 102.
Thus, the position of the punch axis 150 relative to the housing 14
can be adjusted by rotating the cutting head 18 about the swivel
joint 106.
[0024] In some embodiments, the entirety of the clamp assembly 110
may not reciprocate with the drive rod 98. For example, the clamp
assembly 110 may include a motion transfer mechanism that
reciprocates the punch 130 in response to reciprocation of the
drive rod 98. The motion transfer mechanism may include, for
example, a first rack gear coupled to the drive rod 98, a second
rack gear coupled to the punch 130, and a pinion meshed with the
first rack gear and the second rack gear. In such embodiments,
reciprocation of the first rack gear rotates the pinion, which in
turn reciprocates the second rack gear (and the punch 130). In
other embodiments, the drive rod 98 may not reciprocate but rather
provide a rotational input to the cutting head 18. In such
embodiments, the drive rod 98 may be driven by the output shaft 70
for rotation about the axis 102, and a reciprocation mechanism
(e.g., a wobble-plate mechanism) may provided between the drive rod
98 and the punch 130.
[0025] With reference to FIGS. 4 and 5, the illustrated die 138
includes a first opening 154 in communication with the passageway
146 and a second opening 158 in communication with the passageway
146. Debris or chips generated during operation of the nibbler 10
can thus be ejected through either or both the first opening 154 or
the second opening 158. The first and second openings 154, 158 are
located on opposite sides of the die 138 in the illustrated
embodiment. In other embodiments, the relative positions of the
first and second openings 154, 158 may vary, one of the openings
(e.g., the second opening 158) may be omitted, or more than two
openings may be provided.
[0026] The nibbler 10 includes a debris collection container 162
that can be coupled to the cutting head 18 in a first position in
which the debris collection container 162 receives chips ejected
through the first opening 154 (FIG. 5). A removable plug 166 can be
positioned in the second opening 158 to direct chips only through
the first opening 154 and into the container 162. In some
embodiments, the debris collection container 162 may also be
coupled to the cutting head 18 in a second position (not shown) in
which the debris collection container 162 receives chips ejected
through the second opening 158. The plug 166 can then be positioned
in the first opening 154 to direct chips only through the second
opening 158. When the container 162 is coupled to the die 138 in
either the first position or the second position, the container 162
swivels with the cutting head 18 about the third axis 102. In some
embodiments, the container 162 can be coupled to the housing 14
rather than the cutting head 18. In some embodiments, the container
162 may include one or more magnets to attract chips into the
container 162.
[0027] With reference to FIG. 3, in the illustrated embodiment, the
nibbler 10 includes an auxiliary cutting mechanism 170 for cutting
holes in sheet metal (e.g., an enclosed duct) or other workpieces
through which the punch 130 may then be inserted. The auxiliary
cutting mechanism 170 is driven by the motor 16 via the
intermediate shaft 66, and the auxiliary cutting mechanism 170 is
operable either in tandem with or independently from the cutting
head 18. In the illustrated embodiment, the auxiliary cutting
mechanism 170 extends from the handle portion 42 of the housing
(between the head 18 and the battery receptacle 30; FIG. 1) and
along an auxiliary cutting axis 174 that is transverse to the
second axis 54 (FIG. 3). In other embodiments, the auxiliary
cutting mechanism 170 may be located elsewhere on the nibbler 10.
For example, the auxiliary cutting mechanism 170 may be located on
the cutting head 18 (e.g., on a side opposite the punch 130 and die
138) or in front of the cutting head 18. In some embodiments, the
auxiliary cutting mechanism 170 may extend from a rear portion of
the housing 14 behind the motor 16. In such embodiments, the
auxiliary cutting axis 174 may be coaxial with the motor axis 54 or
perpendicular to the motor axis 54. In addition, the auxiliary
cutting mechanism 170 may be positioned such that the auxiliary
cutting axis 174 does not intersect the motor axis 54.
[0028] The auxiliary cutting mechanism 170 includes an integral or
replaceable bit 178 (e.g., a stepped drill bit) having a nominal
diameter larger than that of the punch 130 to create a pilot hole
for the punch 130, which can then be used to create an elongated
cut in the sheet metal or other workpiece. In some embodiments, a
clutch mechanism (not shown) may be provided between the
intermediate ring gear 78 and the intermediate shaft 66 to
selectively couple the intermediate shaft 66 for co-rotation with
the intermediate ring gear 78. The clutch mechanism can thus be
actuated to enable or disable rotation of the auxiliary cutting
mechanism 170.
[0029] In operation of the nibbler 10 in a first mode, an operator
depresses the switch 46 to activate the motor 16, which
continuously supplies torque to the drive assembly 58 via the motor
shaft 50 and the input shaft 62 (FIGS. 1 and 3). The input pinion
74 drives the intermediate ring gear 78 for rotation about the
auxiliary cutting axis 174, which in turn drives the output pinion
82 for rotation about the second axis 54 (FIG. 3). In embodiments
with a clutch mechanism, the clutch mechanism is disabled in the
first mode, such that rotation of the intermediate ring gear 78 is
not transmitted to the intermediate shaft 66.
[0030] As the output shaft 70 rotates, the drive rod 98 of the
cutting head 18 reciprocates along the third axis 102 due to the
motion of the eccentric 86. The drive rod 98 reciprocates the clamp
assembly 110, which in turn reciprocates the punch 130 along the
punch axis 150. The operator may then guide the cutting head 18
onto a piece of sheet metal or another workpiece to be cut. As the
workpiece enters a space 180 in the die 138, the reciprocating
punch 130 repeatedly and incrementally shears small pieces of the
workpiece against the die 138 to create an elongated cut. This
generates debris or chips, which are discharged through the first
opening 154 and into the debris collection container 162. By
containing the chips within the collection container 162, the
nibbler 10 can advantageously make cuts with less cleanup required
compared to typical nibblers. If desired, the operator can rotate
the cutting head 18 about the swivel axis 102 to reorient the
cutting head 18. This enhances the usability of the nibbler 10 in
confined spaces.
[0031] The nibbler 10 is also operable in a second mode in which
the motor 16 drives the auxiliary cutting mechanism 170. In the
second mode, the operator depresses the switch 46 to activate the
motor 16, which continuously supplies torque to the drive assembly
58 via the motor shaft 50 and the input shaft 62 (FIGS. 1 and 3).
The input pinion 74 drives the intermediate gear 78 for rotation
about the auxiliary cutting axis 174. In embodiments with a clutch
mechanism, the clutch mechanism is enabled in the second mode, such
that rotation of the intermediate ring gear 78 is transmitted to
the intermediate shaft 66. The bit 178 of the auxiliary cutting
mechanism 170 co-rotates with the intermediate shaft 66. The user
can then engage the rotating bit 178 with a workpiece to create a
pilot hole in the workpiece. The user may then insert the cutting
head 18 into the hole and operate the nibbler 10 in the first mode,
as described above, to create an elongated cut from the position of
the pilot hole.
[0032] Various features of the invention are set forth in the
following claims.
* * * * *