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US 4,930,384 AGranted
Die for notching hollow tubing
AssigneeSanko Industries Limited
InventorSanji Nakatsuji
Life of this patent
Estimating the term…
Abstract
A die for making an incision in a workpiece by forcibly advancing the die in a linear path against a workpiece. The die consists of a body with leading and trailing ends and a cutting blade on the leading end of the body, which cutting blade has first and second spaced, wedge-shaped projections, each having an apex at its leading end, and a cutting edge between the projections and spaced in a trailing direction from the apexes of the projections.
Claims27
A die for advancement forcibly against the wall of a workpiece to make an incision therein, said die comprising:
- a body having a leading end and a trailing end;
- and
- a cutting blade on the leading end of the body, said cutting blade including:
- first and second spaced projection means for forming first and second discrete incisions in a workpiece wall upon the die being forcibly advanced against the workpiece wall to a first predetermined position relative to the workpiece;
- cutting edge means for severing a portion of the workpiece between the first and second discrete incisions to connect the first and second discrete incisions as the die is advanced beyond said first predetermined position relative to the workpiece;
- each projection having a flat wall with the flat walls on the first and second projections being substantially coplanar;
- and
- said flat walls on the projections cooperatively progressively deforming part of the workpiece wall that is cut by the die as the die is advanced.
5 more elements
A die for advancement forcibly against the wall of a workpiece to make an incision therein, said die comprising:
- a body having a leading end and a trailing end;
- and
- a cutting blade on the leading end of the body, said cutting blade including:
- first and second spaced projection means for forming first and second discrete incisions in a workpiece wall upon the die being forcibly advanced against the workpiece wall to a first predetermined position relative to the workpiece;
- and
- cutting edge means for severing a portion of the workpiece between the first and second discrete incisions to connect the first and second discrete incisions as the die is advanced beyond said first predetermined position relative to the workpiece,
- wherein first cutting edge means are provided for severing the wall of the workpiece along a first line connecting one of the first and second discrete incisions and transverse to a line connecting the first and second discrete incisions as the die is advanced beyond said first predetermined position relative to the workpiece,
- wherein second cutting edge means are provided for severing the wall of the workpiece along a second line connecting the other of the first and second discrete incisions and transverse to a line connecting the first and second discrete incisions as the die is advanced beyond said first predetermined position relative to the workpiece,
- wherein means are provided on the die for progressively deforming a piece of a workpiece wall severed by the die transverse to a line connecting the first and second projections as the die is advanced into the wall of the workpiece.
6 more elements
A die for advancement forcibly against the wall of a workpiece to make an incision therein, said die comprising:
- a body having a leading end and a trailing end;
- and
- a cutting blade on the leading end of the body, said cutting blade including:
- first and second spaced projection means for forming first and second discrete incisions in a workpiece wall upon the die being forcibly advanced against the workpiece wall to a first predetermined position relative to the workpiece;
- and
- cutting edge means for severing a portion of the workpiece between the first and second discrete incisions to connect the first and second discrete incisions as the die is advanced beyond said first predetermined position relative to the workpiece,
- wherein each spaced projection has a leading end defined by two transverse cutting walls,
- wherein the two transverse walls on each leading end make an angle of approximately 90.degree. with each other.
5 more elements
A die for advancement forcibly against the wall of a workpiece to make an incision therein, said die comprising:
- a body having a leading end and a trailing end;
- and
- a cutting blade on the leading end of the body, said cutting blade including:
- first and second spaced projection means for forming first and second discrete incisions in a workpiece wall upon the die being forcibly advanced against the workpiece wall to a first predetermined position relative to the workpiece;
- and
- cutting edge means for severing a portion of the workpiece between the first and second discrete incisions to connect the first and second discrete incisions as the die is advanced beyond said first predetermined position relative to the workpiece,
- wherein each spaced projection has a leading end defined by two transverse cutting walls,
- wherein each die is movable linearly to effect advancement thereof against a workpiece, each projection has an apex and a first straight edge extending away from the apex at a first predetermined acute angle with respect to the line of advancement of the die,
- wherein said predetermined angle is approximately 10.degree.-20.degree..
6 more elements
A die for making an incision in the wall of a workpiece by advancing the die in a linear path against a workpiece, said die comprising:
- a body having a leading end and a trailing end;
- a cutting blade on the leading end of the body, said cutting blade including:
- a curved cutting edge defining first and second projections spaced from each other along a first line and each having an apex;
- a first cutting edge extending in a trailing direction away from the apex of one of the first and second projections and transverse to the first line;
- and
- a second cutting edge extending in a trailing direction away from the apex of the other of the first and second projections and transverse to the first line;
- and
- means between said first and second cutting edges for progressively deforming a flap severed from a tubing piece wall by the curved cutting edge, projections and first and second cutting edges as the cutting blade is advanced against a wall on a workpiece.
5 more elements
A die for making an incision in a workpiece by advancing the die in a linear path against a workpiece, said die comprising:
- a body having a leading end and a trailing end;
- and
- a cutting blade on the leading end of the body, said cutting blade including:
- first and second spaced, wedge-shaped projections each having an apex at the leading end thereof;
- and
- a cutting edge extending between said spaced projections and spaced in a trailing direction from the apexes of the projections,
- each said wedge-shaped projection having a flat wall with the flat walls on the first and second projections being substantially coplanar,
- said flat walls on the projections cooperatively progressively camming a part of the workpiece cut by the die in the direction of movement of the die as the die is advanced.
5 more elements
A method of making an incision in a tubular workpiece having first and second facing wall pairs, said method comprising the steps of:
- providing a die having a cutting blade with a leading end and a trailing end, first and second spaced, wedge-shaped cutting projections each having an apex at the leading end thereof;
- directing the die in a linear path against one of the walls in one of the facing wall pairs of the workpiece;
- advancing the die to direct the projection on the die into the one wall to define two discrete incisions in the one wall;
- further advancing the die to sever the one wall between the discrete incisions and thereby connect the discrete incisions;
- further advancing the die to sever a flap out of the one wall;
- further advancing the die to fold the flap away from one of the walls in the other wall pair;
- further advancing the die to cause the die to cut the other wall on the other wall pair;
- further advancing the die to cause the projections to make third and fourth discrete incisions in the other wall in the one wall pair;
- further advancing the die to sever the other wall in the one wall pair between the third and fourth discrete incisions and thereby connect the third and fourth discrete incisions;
- and
- further advancing the die to separate the flap completely from the tubular workpiece.
8 more elements
Dependencies are inferred from the claim text.