Information
-
Patent Grant
-
6804890
-
Patent Number
6,804,890
-
Date Filed
Thursday, July 17, 200321 years ago
-
Date Issued
Tuesday, October 19, 200420 years ago
-
Inventors
-
-
Examiners
Agents
-
CPC
-
US Classifications
Field of Search
US
- 033 211
- 033 213
- 033 2701
- 033 411
- 033 415
- 033 416
- 033 42
- 033 412
- 033 529
- 033 484
- 033 485
- 033 666
- 033 677
-
International Classifications
-
Abstract
A scribe and a method of using the scribe to mark a cutting guide on one conduit, while also using a second conduit as a guide, is disclosed. The scribe includes a pivot which rests on the outer surface on one conduit. The scribe also includes a scribe element which engages the outer surface of the one conduit. The scribe is moved along the outer surfaces of the two conduits and makes a mark on the one conduit that precisely follows the shape and size of the second conduit. The one conduit is cut along the mark and the second conduit will precisely and accurately fit to the one conduit. A method of coupling two conduits using this scribe is also disclose.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the general art of geometric instruments, and to the particular field of scribers used on curved surfaces.
2. Discussion of the Related Art
Pipe welders are often called upon to cut one conduit to engage a second conduit. The term “conduit” will be used to cover pipes, tubes and other such curved elements. At the present time, this procedure is carried out using a template. The template is formed by a template maker after the pipe welder has supplied dimensions. The template is then placed on a conduit to be cut and the conduit is cut.
This process requires the pipe fitter to wait until the template is supplied before proceeding with his work. This wait is wasteful of the pipe fitter's time and can be costly to his employer due to the down time of the pipe fitter. The wait can be anywhere from a few minutes to hours, or even days, depending on the circumstances.
Therefore, there is a need for a means and a method for defining a cutting guide mark on a conduit which will be joined to another conduit adjacent to the cut made along the cutting guide mark without requiring use of a template.
Often, the pipe fitter is in a location that is not convenient for obtaining a template. Not only does this increase the time required to obtain a template, it also increases the difficulty in obtaining the template.
Therefore, there is a need for a means and a method for in situ defining a cutting guide mark on a conduit which will be joined to another conduit adjacent to the cut made along the cutting guide mark without requiring use of a template.
Often, templates formed for one conduit may not be as accurate and as precise as possible for another conduit. This may be caused by manufacturing tolerances or environmental conditions or the like.
Therefore, there is a need for a means and a method for defining a cutting guide mark on a conduit which will be joined to another conduit-adjacent to the cut made along the cutting guide mark without requiring use of a template yet which can accurately and precisely mark each conduit.
PRINCIPAL OBJECTS OF THE INVENTION
It is a main object of the present invention to provide a means for defining a cutting guide mark on a conduit which will be joined to another conduit adjacent to a cut made along the cutting guide mark without requiring use of a template.
It is another object of the present invention to provide an in situ means for defining a cutting guide mark on a conduit which will be joined to another conduit adjacent to a cut made along the cutting guide mark without requiring use of a template.
It is a specific object of the present invention to provide a scribe for defining a cutting guide mark on a conduit which will be joined to another conduit adjacent to a cut made along the cutting guide mark without requiring use of a template.
It is another object of the present invention to provide a means for defining a cutting guide mark on a conduit which will be joined to another conduit adjacent to a cut made along the cutting guide mark without requiring use of a template and which will accurately and precisely define the cutting guide mark.
It is another object of the present invention to provide a method for defining a cutting guide mark on a conduit which will be joined to another conduit adjacent to a cut made along the cutting guide mark without requiring use of a template.
SUMMARY OF THE INVENTION
These, and other, objects are achieved by a conduit marking scribe comprising a body; a pivot unit on one end of the body, the pivot unit including a wheel which is adapted to contact the outer surface of a first conduit which will be engaged with a second conduit after the second conduit has been cut; and a scribe unit movably mounted on the body, the scribe unit including a scribe element which includes a distal end and which is movable between a first position having the distal end located inside the scribe unit and a second position having the distal end located outside the scribe unit with the distal end in position to contact the outer surface of the second conduit, and a biasing element which biases the scribe element toward the second position.
The objects are also achieved by a method of marking a conduit which includes providing the scribe unit described above, temporarily attaching one end of the second conduit to the outer surface of the first conduit at a location where the second conduit will be joined to the first conduit; contacting the wheel against the outer surface of the first conduit; contacting the wheel against the outer surface of the first conduit, contacting the wheel against the outer surface of the first conduit; locating the scribe unit against the outer surface of the second conduit; contacting the distal end of the scribe unit against the outer surface of the first conduit; and marking the second conduit by moving the scribe unit with respect to the first conduit and with respect to the second conduit so the distal end of the scribe unit engages and marks the second conduit while the wheel of the pivot unit remains in contact with the outer surface of the first conduit and moves over the outer surface of the first conduit.
The scribe will be used in place and thus the user need not wait for a template and will be able to define cutting guide marks that are accurate and precise for the particular job. In this way, if one particular job is slightly different from another, the scribe and method embodying the present invention can accommodate such difference and still provide an accurate and precise cutting guide mark. The scribe embodying the present invention is very easy to transport and thus can be available to the worker at any time and anywhere it is needed.
Still further, the scribe embodying the present invention is easily adaptable for use with additional geometric instruments, such as a ruler. However, the scribe embodying the present invention can be used by itself without requiring any additional instruments for its proper use.
BRIEF DESCRIPTION OF THE DRAWING FIGURES
FIG. 1
is a perspective view of a scribe embodying the present invention.
FIG. 2
is a is an elevational view taken along line
2
—
2
of FIG.
1
.
FIG. 3A
illustrates an initial step of temporarily attaching one conduit to another in the method of using the scribe as embodied in the present invention.
FIG. 3B
illustrates a step of marking one conduit using the other conduit as a guide as embodied in the present invention.
FIG. 3C
shows one conduit attached to the other.
FIG. 3D
is a side elevational view of a conduit after it has been marked and cut in preparation for attaching the conduit with another conduit as embodied in the present invention.
FIG. 4
is a perspective view showing one conduit attached to the other.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Other objects, features and advantages of the invention will become apparent from a consideration of the following detailed description and the accompanying drawings.
Referring to
FIGS. 1 and 2
, it can be understood that the present invention is embodied in a conduit marking scribe
10
that can be used to precisely and accurately place a cutting guide mark on a conduit and will thereby eliminate the need for a template. Scribe
10
comprises a body element
12
. Body element
12
includes a first end
14
, a second end
16
, and a longitudinal axis
18
which extends between the first end
14
of the body element
12
and the second end
16
of the body element
12
.
The body element
12
further includes a first side
20
, a second side
22
, and a transverse axis
24
which extends between the first side
20
of the body element
12
and the second side
22
of the body element
12
.
The body element
12
further includes a first surface
26
, a second surface
28
, and a thickness dimension
30
which extends between the first surface
26
of the body element
12
and the second surface
28
of the body element
12
.
A slot
32
is defined in the body element
12
and extends from adjacent to the first end
14
of the body element
12
to adjacent to the second end
16
of the body element
12
; the slot
32
also extends from the first surface
26
of the body element
12
to the second surface
28
of the body element
12
.
A pivot unit
40
is located on the second end
16
of the body element
12
. Pivot unit
40
is adapted to contact and move along the outer surface of a first conduit C
1
(see
FIG. 4
) which will be engaged with a second conduit C
2
after the second conduit has been cut to accommodate the first conduit.
Pivot unit
40
includes a mounting ear
42
on the second end
16
of the body element
12
and a wheel
44
rotatably mounted on the ear
42
to rotate in a plane containing the transverse axis
24
of the body element
12
. Wheel
44
has an outer circumference
46
and rotates on the mounting ear
42
clockwise CW and counterclockwise CCW with respect to the first and second sides
20
,
22
of the body element
12
. Pivot unit
40
further includes knurling
47
on the outer circumference
46
of the wheel
44
, and a center hole
48
which is defined through the wheel
44
and through the mounting ear
42
.
A scribe unit
50
is movably mounted on the body element
12
, and is shown in FIG.
2
. Scribe unit
50
includes a frame
52
having a first surface
54
, a second surface
56
, and a thickness dimension
58
that extends in the direction of the thickness dimension
30
of the body element
12
when the first surface
54
of the frame
52
is positioned to abut the second surface
28
of the body element
12
(see FIG.
1
). Frame
50
has a hole
60
defined therethrough with the hole
60
being oriented to extend in the direction of the thickness dimension
30
of the body element
12
when the first surface
54
of the frame
52
is in contact with the second surface
28
of the body element
12
. A counterbore
62
is defined in the second surface
56
of the frame
52
adjacent to the hole
60
defined through the frame
52
.
Scribe unit
50
further includes a bored bolt
70
which includes a head end
72
located in the counterbore
62
defined in the second surface
56
of the frame
52
when the bored bolt
70
is in place on the frame
52
as shown in
FIG. 2. A
bolt body
74
extends from the head
72
of the bored bolt
70
through hole
60
defined through the frame
52
to extend through slot
32
defined in the body element
12
when the scribe unit
50
is in place mounted on the body element
12
as indicated in
FIGS. 1 and 2
. The bored bolt
70
further includes a second end
76
and an outer surface
78
on the bored bolt body
74
. A bore
80
is defined in the bored bolt body
74
and extends from the head
72
of the bored bolt
70
to the second end
76
of the bored bolt
70
. Bored bolt
70
has an inner surface
82
located adjacent to the bore
80
defined in the bored bolt body
74
. A screw thread
84
is defined in the outer surface
78
of the bored bolt body
74
.
An annular washer
90
has a first surface
92
and a second surface
94
. Second surface
94
of the annular washer
90
is located to contact the first surface
54
of the frame
52
when the annular washer
90
is in place on the frame
52
as shown in FIG.
2
. The annular washer
90
has a hole
96
defined therethrough. Hole
96
extends from the first surface
92
of the washer
90
to the second surface
94
of the washer
90
and is aligned with hole
60
defined through the frame
52
when the washer
90
is in place as shown in FIG.
2
.
An annular nut
100
has a first surface
102
and a second surface
104
, with the second surface
104
of the annular nut
100
contacting the first surface
92
of the annular washer
90
when the washer
90
and the nut
100
are in place as shown in FIG.
2
. Nut
100
has a hole
106
defined therethrough from the first surface
102
of the nut
100
to the second surface
104
of the nut
100
. Hole
106
is aligned with hole
96
defined through the washer
90
and is aligned with hole
60
defined through the frame
52
when the nut
100
and the washer
90
are in place on the frame
52
as shown in FIG.
2
. Nut
100
has a screw thread
110
defined thereon adjacent to the hole
106
defined through the nut
100
. The screw thread
110
on the nut
100
threadably engages the screw thread
84
on the bored bolt
70
when the bored bolt
70
and the nut
100
are in place, on the frame
52
.
A bored knob
120
is located on the bored bolt
70
when the knob
120
is in place as shown in FIG.
2
. Bored knob
120
includes a body
122
, a first end
124
on the body
122
of the knob
120
, and a second end
126
on the body
122
of the knob
120
. First end
124
of the bored knob
120
is spaced apart from first surface
102
of nut
100
to define a gap
130
between the bored knob
120
and the nut
100
when the knob
120
and the nut
100
are in place on the bored bolt
70
as shown in FIG.
2
. Body element
12
is interposed between the nut
100
and the knob
120
when the scribe unit
50
is in place on the body element
12
with the first surface
26
of the body element
12
in contact with the first end
124
of the knob
120
and the second surface
28
of the body element
12
in contact with the first surface
102
of the nut
100
whereby the scribe unit
50
is held in place on the body element
12
through frictional engagement with the body element
12
.
A blind-ended bore
140
is defined in the bored knob
120
. The blind-ended bore
140
extends from the first end
124
of the knob
120
toward the second end
126
of the knob
120
and is aligned with the hole
106
defined through the nut
100
when the knob
120
and the nut
100
are in place on the bored bolt
70
as shown in FIG.
2
.
A screw thread
142
is defined on the bored knob
120
adjacent to the blind-ended bore
140
. The screw thread
142
on the knob
120
and the screw thread
84
on the bored bolt
70
are threadably engaged with each other when the knob
120
is in place on the bolt
70
as shown in FIG.
2
.
A compression spring
150
is located inside the blind-ended bore
140
and has a first end
152
abutting the knob
120
adjacent to the blind-ended bore
140
and a second end
154
located inside the bore
106
defined through the bored nut
100
when the knob
120
is in place on the bored bolt
70
and the spring
150
is in place in the blind-ended bore
140
as shown in FIG.
2
.
A scribe element
160
is movably positioned inside the bore
80
of the bored bolt
70
when the scribe element
160
is in place as shown in FIG.
2
. The scribe element
160
includes a proximal end
164
in abutting contact with a second end of the spring
150
when the scribe element
160
is in place in the bore of the bored bolt
70
and a distal end
166
which is located adjacent to the head
72
of the bored bolt
70
when the scribe element
160
is in place. The scribe element
160
moves between a first position in which the distal end
166
of the scribe element
160
is located inside the bore
80
of the bored bolt
70
and a second position shown in
FIG. 2
in which the distal end
166
of the scribe element
160
is located outside the bore
80
of the bored bolt
70
. The spring
150
biases the scribe element
160
toward the second position. The distal end of the scribe element is adapted to contact outer surface S
2
of second conduit C
2
while the pivot unit
40
is in contact with first conduit C
1
.
Referring to
FIGS. 3A-4
, it can be understood that the present invention is also embodied in a method of scribing a conduit, which comprises marking a conduit which includes providing the scribe unit
50
described above, temporarily attaching one end E, as by a tack weld W, of the second conduit to the outer surface of the first conduit at a location L where the second conduit will be joined to the first conduit as indicated in
FIG. 3A
; contacting the wheel
44
against the outer surface S
1
of the first conduit, the knurling
47
providing a good grip on the conduit; locating the scribe unit
50
against outer surface S
2
of the second conduit; contacting the distal end
166
of the scribe unit
50
against outer surface S
1
of the first conduit; and marking the second conduit by moving the scribe unit
50
with respect to the first conduit and with respect to the second conduit so the distal end
166
of the scribe unit
50
engages and marks the second conduit while the wheel
44
of the pivot unit
40
remains in contact with the outer surface of the first conduit and moves over the outer surface of the first conduit as indicated in FIG.
3
B. As will be understood by those skilled in the art based on the teaching of this disclosure, the distal end
166
of the scribe unit
50
is forced out of the blind-ended bore
140
by the biasing of the spring
150
and is forced out far enough to remain in contact with the curved outer surface of conduit C
2
even when that outer surface is located farthest away from the scribe unit
50
. The marking process is repeated for as many cuts as will be made in the second conduit. There are two cuts made in the second conduit in
FIGS. 3A and 3B
, and the final product for conduit C
2
is indicated in FIG.
4
. Conduit C
1
will be joined to conduit C
2
by weld W
2
.
As indicated in
FIG. 3C
, the first and second conduits are then joined together along the cuts made in the second conduit. The temporary joining of the two conduits can be effected by tack welds, and the final joining of the two conduits can be effected by welding.
The final product is indicated in
FIG. 4
with the first and second conduits joined together.
While the conduit marking device described above can be used without any other instruments, if desired, the conduit marking device
10
can also be used in conjunction with another instrument, such as a ruler R shown in FIG.
1
.
It is understood that while certain forms of the present invention have been illustrated and described herein, it is not to be limited to the specific forms or arrangements of parts described and shown.
Claims
- 1. A conduit marking scribe comprising:a) a body element which includes (1) a first end, (2) a second end, (3) a longitudinal axis extending between the first end of said body element and the second end of said body element, (4) a first side, (5) a second side, (6) a transverse axis extending between the first side of said body element and the second side of said body element, (7) a first surface, (8) a second surface, (9) a thickness dimension extending between the first surface of said body element and the second surface of said body element, and (10) a slot defined in said body element and extending from adjacent to the first end of said body element to adjacent to the second end of said body element and extending from the first surface of said body element to the second surface of said body element; b) a pivot unit on the second end of said body element, said pivot unit being adapted to contact and move along the outer surface of a first conduit which will be engaged with a second conduit after the second conduit has been cut to accommodate the first conduit, said pivot unit including (1) a mounting ear on the second end of said body element, (2) a wheel rotatably mounted on the ear to rotate in a plane containing the transverse axis of said body element, the wheel having an outer-circumference and rotating on the mounting ear clockwise and counterclockwise with respect to the first and second sides of said body element, (3) knurling on the outer circumference of the wheel, and (4) a center hole defined through the wheel and through the mounting ear; and c) a scribe unit movably mounted on said body element, said scribe unit including (1) a frame having a first surface and a second surface and a thickness dimension that extends in the direction of the thickness dimension of said body element when the first surface of the frame is positioned to abut the second surface of said body element, the frame having a hole defined therethrough with the hole being oriented to extend in the direction of the thickness dimension of said body element when the first surface of the frame is in contact with the second surface of said body element, (2) a counterbore defined in the second surface of the frame adjacent to the hole defined through the frame, (3) a bored bolt including (A) a head end located in the counterbore defined in the second surface of the frame when the bored bolt is in place on the frame, (B) a bolt body which extends from the head of the bored bolt through the hole defined through the frame to extend through the slot defined in said body element when said scribe unit is in place mounted on said body element, (C) a second end, (D) an outer surface on the bored bolt body, (E) a bore defined in the bored bolt body and which extends from the head of the bored bolt to the second end of the bored bolt, the bored bolt having an inner surface located adjacent to the bore defined in the bored bolt body, and (F) a screw thread defined in the outer surface of the bored bolt body, (4) an annular washer having a first surface and a second surface, the second surface of the annular washer being located to contact the first surface of the frame when the annular washer is in place on the frame, the annular washer having a hole defined therethrough, the hole defined through the annular washer extending from the first surface of the washer to the second surface of the washer and is aligned with the hole defined through the frame when the washer is in place, (5) an annular nut having a first surface and a second surface, the second surface of the annular nut contacting the first surface of the annular washer when the washer and the nut are in place, the nut having a hole defined therethrough from the first surface of the nut to the second surface of the nut, the hole defined through the nut being aligned with the hole defined through the washer and with the hole defined through the frame when the nut and the washer are in place on the frame, the nut having a screw thread defined thereon adjacent to the hole defined through the nut, the screw thread on the nut threadably engaging the screw thread on the bored bolt when the bored bolt and the nut are in place on the frame, (6) a bored knob, the bored knob including (A) a body, (B) a first end on the body of the knob, (C) a second end on the body of the knob, the first end of the bored knob being spaced apart from the first surface of the nut to define a gap between the bored knob and the nut when the knob and the nut are in place on the bored bolt, said body element being interposed between the nut and the knob when said scribe unit is in place on said body element with the first surface of said body element in contact with the first end of the knob and the second surface of said body element in contact with the first surface of the nut whereby said scribe unit is held in place on said body element through frictional engagement with said body element, (D) a blind-ended bore defined in the bored knob, the blind-ended bore extending from the first end of the knob toward the second end of the knob, the blind-ended bore being aligned with the hole defined through the nut when the knob and the nut are in place on the bored bolt, and (E) a screw thread defined on the bored knob adjacent to the blind-ended bore, the screw thread on the knob and the screw thread on the bored bolt being threadably engaged with each other when the knob is in place on the bolt, (7) a compression spring located inside the blind-ended bore and having a first end abutting the knob adjacent to the blind-ended bore and having a second end located inside the bore defined through the bored nut when the knob is in place on the bored bolt and the spring is in place in the blind-ended bore, and (8) a scribe element movably positioned inside the bore of the bored bolt when the scribe element is in place, the scribe element including a proximal end in abutting contact with the second end of the spring when the scribe element is in place in the bore of the bored bolt and a distal end which is located adjacent to the head of the bored bolt when the scribe element is in place, the scribe element moving between a first position in which the distal end of the scribe element is located inside the bore of the bored bolt and a second position in which the distal, end of the scribe element is located outside the bore of the bored bolt, the spring biasing the scribe element toward the second position, the distal end of the scribe element being adapted to contact the outer surface of the second conduit while the pivot unit is in contact with the first conduit.
- 2. The conduit marking scribe as described in claim 1 further including a ruler adapted to contact the first end of said body element.
- 3. A method of scribing a conduit comprisinga) providing a conduit marking scribe having (1) a body element which includes (A) a first end, (B) a second end, (C) a longitudinal axis extending between the first end of said body element and the second end of said body element, (D) a first side, (E) a second side, (F) a transverse axis extending between the first side of said body element and the second side of said body element, (G) a first surface, (H) a second surface, (I) a thickness dimension extending between the first surface of said body element and the second surface of said body element, and (J) a slot defined in said body element and extending from adjacent to the first end of said body element to adjacent to the second end of said body element and extending from the first surface of said body element to the second surface of said body element; (2) a pivot unit on the second end of said body element, said pivot unit being adapted to contact and move along the outer surface of a first conduit which will be engaged with a second conduit after the second conduit has been cut to accommodate the first conduit, said pivot unit including (A) a mounting ear on the second end of said body element, (B) a wheel rotatably mounted on the ear to rotate in a plane containing the transverse axis of said body element, the wheel having an outer circumference and rotating on the mounting ear clockwise and counterclockwise with respect to the first and second sides of said body element, (C) knurling on the outer circumference of the wheel, and (D) a center hole defined through the wheel and through the mounting ear; and (3) a scribe unit movably mounted on said body element, said scribe unit including (A) a frame having a first surface and a second surface and a thickness dimension that extends in the direction of the thickness dimension of said body element when the first surface of the frame is positioned to abut the second surface of said body element, the frame having a hole defined therethrough with the hole being oriented to extend in the direction of the thickness dimension of said body element when the first surface of the frame is in contact with the second surface of said body element, (B) a counterbore defined in the second surface of the frame adjacent to the hole defined through the frame, (C) a bored bolt including (I) a head end located in the counterbore define din the second surface of the frame when the bored bolt is in place on the frame, (ii) a bolt body which extends from the head of the bored bolt through the hole defined through the frame to extend through the slot defined in said body element when said scribe unit is in place mounted on said body element, (iii) a second end, (iv) an outer surface on the bored bolt body, (v) a bore defined in the bored bolt body and which extends from the head of the bored bolt to the second end of the bored bolt, the bored bolt having an inner surface located adjacent to the bore defined in the bored bolt body, and (vi) a screw thread defined in the outer surface of the bored bolt body, (D) an annular washer having a first surface and a second surface, the second surface of the annular washer being located to contact the first surface of the frame when the annular washer is in place on the frame, the annular washer having a hole defined therethrough, the hole defined through the annular washer extending from the first surface of the washer to the second surface of the washer and is aligned with the hole defined through the frame when the washer is in place, (E) an annular nut having a first surface and a second surface, the second surface of the annular nut contacting the first surface of the annular washer when the washer and the nut are in place, the nut having a hole defined therethrough from the first surface of the nut to the second surface of the nut, the hole defined through the nut being aligned with the hole defined through the washer and with the hole defined through the frame when the nut and the washer are in place on the frame, the nut having a screw thread defined thereon adjacent to the hole defined through the nut, the screw thread on the nut threadably engaging the screw thread on the bored bolt when the bored bolt and the nut are in place on the frame, (F) a bored knob, the bored knob including (I) a body, (ii) a first end on the body of the knob, (iii) a second end on the body of the knob, the first end of the bored knob being spaced apart from the first surface of the nut to define a gap between the bored knob and the nut when the knob and the nut are in place on the bored bolt, said body element being interposed between the nut and the knob when said scribe unit is in place on said body element with the first surface of said body element in contact with the first end of the knob and the second surface of said body element in contact with the first surface of the nut whereby said scribe unit is held in place on said body element through frictional engagement with said body element, (iv) a blind-ended bore defined in the bored knob, the blind-ended bore extending from the first end of the knob toward the second end of the knob, the blind-ended bore being aligned with the hole defined through the nut when the knob and the nut are in place on the bored bolt, and (v) a screw thread defined on the bored knob adjacent to the blind-ended bore, the screw thread on the knob and the screw thread on the bored bolt being threadably engaged with each other when the knob is in place on the bolt, (G) a compression spring located inside the blind-ended bore and having a first end abutting the knob adjacent to the blind-ended bore and having a second end located inside the bore defined through the bored nut when the knob is in placed on the bored bolt and the spring is in place in the blind-ended bore, and (H) a scribe element movably positioned inside the bore of the bored bolt when the scribe element is in place, the scribe element including a proximal end in abutting contact with the second end of the spring when the scribe element is in place in the bore of the bored bolt and a distal end which is located adjacent to the head of the bored bolt when the scribe element is in place, the scribe element moving between a first position in which the distal end of the scribe element is located inside the bore of the bored bolt and a second position in which the distal end of the scribe element is located outside the bore of the bored bolt, the spring biasing the scribe element toward the second position, the distal end of the scribe element being adapted to contact the outer surface of the second conduit while the pivot unit is in contact with the first conduit; b) temporarily attaching one end of the second conduit to the outer surface of the first conduit at a location where the second conduit will be joined to the first conduit; c) contacting the wheel against the outer surface of the first conduit; d) locating the scribe unit against the outer surface of the second conduit; e) contacting the distal end of the scribe unit against the outer surface of the first conduit; and f) marking the second conduit by moving the scribe unit with respect to the first conduit and with respect to the second conduit so the distal end of the scribe unit engages and marks the second conduit while the wheel of the pivot unit remains in contact with the outer surface of the first conduit and moves over the outer surface of the first conduit.
- 4. The method as described in claim 3 further including steps of joining the first conduit to the second conduit by cutting the second conduit along the mark made on the second conduit; and joining the second conduit to the first conduit adjacent to the cut made in the second conduit.
US Referenced Citations (11)
