CA1139215A - Notching tool - Google Patents
Notching toolInfo
- Publication number
- CA1139215A CA1139215A CA000358660A CA358660A CA1139215A CA 1139215 A CA1139215 A CA 1139215A CA 000358660 A CA000358660 A CA 000358660A CA 358660 A CA358660 A CA 358660A CA 1139215 A CA1139215 A CA 1139215A
- Authority
- CA
- Canada
- Prior art keywords
- blade
- shearing
- male
- female
- pivot pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
ABSTRACT
A pipe notching tool to produce a notch extending longitudinally of the pipe from an end thereof, the tool including two members pivotally interconnected, one member having a slotted die part and the other member having a blade which can be inserted in the die part as a result of relative pivotal motion between the members. The blade has a curved cutting edge which produces a continuing shear as the blade is inserted into the die so as to reduce the amount of effort required to complete the notching operation.
A pipe notching tool to produce a notch extending longitudinally of the pipe from an end thereof, the tool including two members pivotally interconnected, one member having a slotted die part and the other member having a blade which can be inserted in the die part as a result of relative pivotal motion between the members. The blade has a curved cutting edge which produces a continuing shear as the blade is inserted into the die so as to reduce the amount of effort required to complete the notching operation.
Description
~39Z3lS
This invention relates to apparatus to longitudinally notch the end of a pipe and provides a notching tool in which a male blade co-acts with a female blade in a shearing operation. Th male blade is so shaped that at the commencement of the shearing action there is a major ~orce vector which is at substantially 90 degrees to the female blade. This avoids the creation of forces during shearing which would tend to move the pipe longitudinally relative to the shearing blades, as would occur if a scissor type shearing operation was attempted.
In the construction and assembly of exhaust pipelines for motor vehicles or other engines it is common to pass the up-stream end of a length o pipe in the pipeline over the down-stream end of a preceeding length of pipe in the pipeline. The joint between the interconnected lengths of pipe is then sealed to make the joint gasproof. In order to proceed as above it is also common to expand the said up-stream end and to split the expanded portion to allow clamping means to draw the said up-stream end into close gastight engagement with the pipe end housed in the expanded portion.
The splitting of the expanded portion has commonly been done by notching out narrow longitudinal portions of the pipe, working from the exterior to the interior of the pipe. A burr results on the inside of the pipe when ~ .
\`,_2_ .. . . . .. . ... . .. ... . . ..
~392~S
notching in this manner and this burr pr~sents an assembly probleln. l`he problem arises out of the fact that the expansion of the pipe is usually only sufficient to receive the end of the pipe to be engayed therein with a minimum of clearance. The removal of the burr to permit assembly is a manual or, at best, a part mechanical operation and involves man-time the cost of which has to be built into the overall cost of constructing the pipeline.
In looking at this problem the applicant has developed a notching tool as previously broadly defined which has the advantages set out above. It has the further advantage that it can be constructed to operate so as to shear from the inside to the outside of a pipe leaving the burr which results on the outside of the pipe.
~roadly, the invention comprises a pipe notching tool to produce a notch extending longitudinally of a pipe from an end thereof, the tool comprises a first member, a second member and a pivot pin pivotally connecting the first and second member5, a female blade on the first member, a slot in the female blade extending away from the axis of pivotal connection of the first and second members, said slot having two shearing sides joined by a shearing end remote from the pivot pin, a male blade on the second member aligned with the slot of the female blade so as to enter therein on a closing relative pivotal movement between the first and the second members to cause a shearing action .. . . . .. . . .. . .. . . . . . . . . .
1139~15 between opposed corners of a shearing edge of the male blade and the shearing sides of the female blade slot and a shearing action between a trailing end of the male blade and the shearing end of the female blade slot, said shearing edge of the male blade being convexly curved towards the female blade with the convex curve extending from a leading end of the male blade shearing edge to said trailing end of thereof, the leading end of the male blade shearing edge being spaced from the female blade when the first and second members are pivoted to an open pipe receiving position by an amount at least equal to the thickness of the wall of the pipe to be notched to firstly permit the pipe wall to enter between the female blade and the leading end of the male blade shearing edge and secondly to provide an initial shearing contact of the male blade with the pipe in which the major force vector of the shearing action is substantially at right angles to the female blade.
. ' _~b-~139215 A preferred embodiment of the invention will be described hereinafter with reference to the accompanying drawings in which:
Fig. 1 is a perspective view of the notch~ng tool of the present invention, Fig. 2 is a sectional view along line 2-2 of the notching tool as illustrated in the Fig. 1, and Fig. 3 is a section along line 2-2 of the notching tool in an advanced stage in a notching operation.
In the drawings the notching tool comprises a base ) 1 comprised of two vertical walls 2 welded to a foot plate 3. A bifurcated head 4 is welded to the walls 2. The head 4 is rebated as at 5 to receive a female blade 6 secured to the head 4 by screws 7. The female blade 6 has a slot 8 with shearing edges 9 and a shearing end 10.
There are two ears 11 on the head 4 with a hole through each ear 11.
There is a blade holder 12 bifurcated at one end to provide legs 13. The legs 13 are pivotally connected ~20 by pivot pin to the two ears 11. A male blade 14 has a shank 15 mounted in a slot 16 in the blade holder 12 and screws secure the blade shank 15 in the slot 16. The male blade also includes a cutting portion 17 which includes a hole which embraces the pivot pin . A convexly curved shearing edge 18 extends from a step 19 at the leading end of the shearing edge 18 to the trailing end 20 of the male blade cutting portion 17. The step 19 permits the end of a pipe to be notched to be entered between the leading end of the shearing edge 18 and the female blade 6 when the blade holder 12 is pivoted to the open,pipe-receiving condition shown in Figs. 1 and 2. Movement of the blade holder 12 from the position shown in Figs. 1 and 2 through a tool closing phase (as shown in Fig. 3) to a closed, notch completing position, by application of a force to the handle 21, causes shearing action between the opposed corners of the shearing edge 18 of the male blade cutting portion 17 )Q and the shearing edges 9 of the female blade 6 and the trail-ing end 20 of the male blade cutting portion 17 and the shearing end 10 of the female blade 6. The portion sheared from the pipe drops through the bifurcation of the head 4 into a discharge position between the legs 12 from whence scrap metal can be removed.
It is to be noted that the male blade cutting portion 17 is dimensioned to fit into the end of the pipe 22 and the height of the step 19 is sufficient to receive the thickness of the pipe 22 to be notched.
0 It is to be noted also that the arrangements of the parts is such that there is a continuously advancing point contact of the corners of the shearing edge 18 of the male blade and the shearing edges 9 of the slot in the female blade to provide a progressive point shearing action. This arrangement decreases the effort required to effect shearing.
The step 19 ensures initial penetration of the leading end of the male blade cutting edge 18 into the material of the 1139~15 pipe as the initial shearing contact of the male blade with the pipe is one involving a major force vector which is substantially at 90 to the female blade. This prevents the pipe from moving longitudinally away from the pivot pin as is likely with a shearing action having a force vector in a direction at an angle to the female blade other than substantially 90. The latter situation would arise if a scissor type shear was attempted.
Other aspects o~ the invention are the removability ~0 of the male and female blades, this permits servicing of the blades should they require repair or replacement, as for example if-chipping occurs during use. The pin by passing through the hole in the male blade stabilises the male blade and provides resistance against the reaction forces resulting from the notching of the pipe.
Whilst the foregoing description illustrates a replacable female blade it would be possible to have the head 4 manufactured from a piece of tool-type steel which was heat treated to the degree required to perform the 0 cutting requirements.
5 _
This invention relates to apparatus to longitudinally notch the end of a pipe and provides a notching tool in which a male blade co-acts with a female blade in a shearing operation. Th male blade is so shaped that at the commencement of the shearing action there is a major ~orce vector which is at substantially 90 degrees to the female blade. This avoids the creation of forces during shearing which would tend to move the pipe longitudinally relative to the shearing blades, as would occur if a scissor type shearing operation was attempted.
In the construction and assembly of exhaust pipelines for motor vehicles or other engines it is common to pass the up-stream end of a length o pipe in the pipeline over the down-stream end of a preceeding length of pipe in the pipeline. The joint between the interconnected lengths of pipe is then sealed to make the joint gasproof. In order to proceed as above it is also common to expand the said up-stream end and to split the expanded portion to allow clamping means to draw the said up-stream end into close gastight engagement with the pipe end housed in the expanded portion.
The splitting of the expanded portion has commonly been done by notching out narrow longitudinal portions of the pipe, working from the exterior to the interior of the pipe. A burr results on the inside of the pipe when ~ .
\`,_2_ .. . . . .. . ... . .. ... . . ..
~392~S
notching in this manner and this burr pr~sents an assembly probleln. l`he problem arises out of the fact that the expansion of the pipe is usually only sufficient to receive the end of the pipe to be engayed therein with a minimum of clearance. The removal of the burr to permit assembly is a manual or, at best, a part mechanical operation and involves man-time the cost of which has to be built into the overall cost of constructing the pipeline.
In looking at this problem the applicant has developed a notching tool as previously broadly defined which has the advantages set out above. It has the further advantage that it can be constructed to operate so as to shear from the inside to the outside of a pipe leaving the burr which results on the outside of the pipe.
~roadly, the invention comprises a pipe notching tool to produce a notch extending longitudinally of a pipe from an end thereof, the tool comprises a first member, a second member and a pivot pin pivotally connecting the first and second member5, a female blade on the first member, a slot in the female blade extending away from the axis of pivotal connection of the first and second members, said slot having two shearing sides joined by a shearing end remote from the pivot pin, a male blade on the second member aligned with the slot of the female blade so as to enter therein on a closing relative pivotal movement between the first and the second members to cause a shearing action .. . . . .. . . .. . .. . . . . . . . . .
1139~15 between opposed corners of a shearing edge of the male blade and the shearing sides of the female blade slot and a shearing action between a trailing end of the male blade and the shearing end of the female blade slot, said shearing edge of the male blade being convexly curved towards the female blade with the convex curve extending from a leading end of the male blade shearing edge to said trailing end of thereof, the leading end of the male blade shearing edge being spaced from the female blade when the first and second members are pivoted to an open pipe receiving position by an amount at least equal to the thickness of the wall of the pipe to be notched to firstly permit the pipe wall to enter between the female blade and the leading end of the male blade shearing edge and secondly to provide an initial shearing contact of the male blade with the pipe in which the major force vector of the shearing action is substantially at right angles to the female blade.
. ' _~b-~139215 A preferred embodiment of the invention will be described hereinafter with reference to the accompanying drawings in which:
Fig. 1 is a perspective view of the notch~ng tool of the present invention, Fig. 2 is a sectional view along line 2-2 of the notching tool as illustrated in the Fig. 1, and Fig. 3 is a section along line 2-2 of the notching tool in an advanced stage in a notching operation.
In the drawings the notching tool comprises a base ) 1 comprised of two vertical walls 2 welded to a foot plate 3. A bifurcated head 4 is welded to the walls 2. The head 4 is rebated as at 5 to receive a female blade 6 secured to the head 4 by screws 7. The female blade 6 has a slot 8 with shearing edges 9 and a shearing end 10.
There are two ears 11 on the head 4 with a hole through each ear 11.
There is a blade holder 12 bifurcated at one end to provide legs 13. The legs 13 are pivotally connected ~20 by pivot pin to the two ears 11. A male blade 14 has a shank 15 mounted in a slot 16 in the blade holder 12 and screws secure the blade shank 15 in the slot 16. The male blade also includes a cutting portion 17 which includes a hole which embraces the pivot pin . A convexly curved shearing edge 18 extends from a step 19 at the leading end of the shearing edge 18 to the trailing end 20 of the male blade cutting portion 17. The step 19 permits the end of a pipe to be notched to be entered between the leading end of the shearing edge 18 and the female blade 6 when the blade holder 12 is pivoted to the open,pipe-receiving condition shown in Figs. 1 and 2. Movement of the blade holder 12 from the position shown in Figs. 1 and 2 through a tool closing phase (as shown in Fig. 3) to a closed, notch completing position, by application of a force to the handle 21, causes shearing action between the opposed corners of the shearing edge 18 of the male blade cutting portion 17 )Q and the shearing edges 9 of the female blade 6 and the trail-ing end 20 of the male blade cutting portion 17 and the shearing end 10 of the female blade 6. The portion sheared from the pipe drops through the bifurcation of the head 4 into a discharge position between the legs 12 from whence scrap metal can be removed.
It is to be noted that the male blade cutting portion 17 is dimensioned to fit into the end of the pipe 22 and the height of the step 19 is sufficient to receive the thickness of the pipe 22 to be notched.
0 It is to be noted also that the arrangements of the parts is such that there is a continuously advancing point contact of the corners of the shearing edge 18 of the male blade and the shearing edges 9 of the slot in the female blade to provide a progressive point shearing action. This arrangement decreases the effort required to effect shearing.
The step 19 ensures initial penetration of the leading end of the male blade cutting edge 18 into the material of the 1139~15 pipe as the initial shearing contact of the male blade with the pipe is one involving a major force vector which is substantially at 90 to the female blade. This prevents the pipe from moving longitudinally away from the pivot pin as is likely with a shearing action having a force vector in a direction at an angle to the female blade other than substantially 90. The latter situation would arise if a scissor type shear was attempted.
Other aspects o~ the invention are the removability ~0 of the male and female blades, this permits servicing of the blades should they require repair or replacement, as for example if-chipping occurs during use. The pin by passing through the hole in the male blade stabilises the male blade and provides resistance against the reaction forces resulting from the notching of the pipe.
Whilst the foregoing description illustrates a replacable female blade it would be possible to have the head 4 manufactured from a piece of tool-type steel which was heat treated to the degree required to perform the 0 cutting requirements.
5 _
Claims (4)
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A pipe notching tool to produce a notch extending longitudinally of a pipe from an end thereof, the tool comprises a first member, a second member and a pivot pin pivotally connecting the first and second members, a female blade on the first member, a slot in the female blade extending away from the axis of pivotal connection of the first and second members, said slot having two shearing sides joined by a shearing end remote from the pivot pin, a male blade on the second member aligned with the slot of the female blade so as to enter therein on a closing relative pivotal movement between the first and the second members to cause a shearing action between opposed corners of a shearing edge of the male blade and the shearing sides of the female blade slot and a shearing action between a trailing end of the male blade and the shearing end of the female blade slot, said shearing edge of the male blade being convexly curved towards the female blade with the convex curve extending from a leading end of the male blade shearing edge to said trailing end of thereof, the leading end of the male blade shearing edge being spaced from the female blade when the first and second members are pivoted to an open pipe receiving position by an amount at least equal to the thickness of the wall of the pipe to be notched to firstly permit the pipe wall to enter between the female blade and the leading end of the male blade (6) shearing edge and secondly to provide an initial shearing contact of the male blade with the pipe in which the major force vector of the shearing action is substantially at right angles to the female blade.
2. The tool as claimed in claim 1 wherein the first member includes a base, a hollow column fixed to the base, a head fixed to the column and incorporating the female blade, lugs on the head and aligned pivot pin holes in the lugs; the second member includes a blade holder, aligned pivot pin holes in the blade holder with the male blade mounted in a slot in the blade holder; the pivot pin passes through the holes in the lugs of the head and the holes of the blade holder to pivotally connect the first member and the second member.
3. The tool claimed in claim 2 wherein the male blade includes a hole through which the pivot pin passes.
4. The tool claimed in claim 1 wherein the first member includes a base, a pair of legs fixed to the base, a bifurcated head fixed to the legs, a rebate in the head with the female blade releasably secured in said rebate, lugs on the head and aligned pivot pin holes in the lugs, the second member is a blade holder bifurcated to provide two legs, aligned pivot pin holes in the legs of the blade holder and the pivot pin passes through the holes of the (7) legs and the holes of the lugs, a blade slot in the blade holder, a shank on the male blade, a body part of the male blade including a hole to receive the pivot pin, a cutting part of the male blade body incorporating the shearing edge of the male blade and fastening means fastening the male blade shank in the blade slot of the blade holder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000358660A CA1139215A (en) | 1980-08-20 | 1980-08-20 | Notching tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000358660A CA1139215A (en) | 1980-08-20 | 1980-08-20 | Notching tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1139215A true CA1139215A (en) | 1983-01-11 |
Family
ID=4117697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000358660A Expired CA1139215A (en) | 1980-08-20 | 1980-08-20 | Notching tool |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1139215A (en) |
-
1980
- 1980-08-20 CA CA000358660A patent/CA1139215A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |