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US 5,836,229 AGranted
Glass scribing disc
AssigneeMitsuboshi Diamond Industrial Co., Ltd.
InventorsHaruo Wakayama, Yasuhiro Chiyo
Life of this patent
Estimating the term…
Abstract
A glass cutting disc forms a scribed line on a surface of a glass product along which the glass product can be broken when an external force is applied thereto. The glass cutting disc includes an outer peripheral portion radially outwardly beveled to define a peripheral ridge. The peripheral ridge has surface features formed thereon so as to alternate in a direction circumferentially of the cutting disc. The surface features may be in the form of protrusions and grooves that alternate with each other over the peripheral ridge.
Claims36
A glass scribing disc for defining, when rotated about a center of said disc, a scribed line on a plate glass represented by cracks running generally halfway across the thickness of the plate glass to facilitate breakage of the plate glass into pieces along such scribed line, said glass scribing disc comprising:
- a round flat body having a thickness within a range of 0.6 to 5 mm and having a diameter within a range of 1 to 20 mm;
- said round flat body having opposite first and second round surfaces and first and second outer peripheral surfaces extending from respective said first and second round surfaces to converge at an angle within a range of 90.degree. to 160.degree. to thereby define a peripheral scribing edge;
- said peripheral scribing edge having defined therein a series of circumferentially alternating grooves and protrusions;
- and
- each of said protrusions having a radial height within a range of 2 to 20 .mu.m as measured in a direction radially outwardly of said round flat body from a base of adjacent grooves, each pair of adjacent protrusions being spaced from each other in a direction circumferentially of said round flat body by a pitch of 20 to 200 .mu.m.
2 more elements
An automatic glass scribing machine comprising:
- a table means for supporting thereon a plate glass to be scribed along an intended line, said table means being movable in either one of two directions perpendicular to each other;
- and
- a cutter head movably supported above said table means and including a glass scribing disc for defining on the plate glass when said cutter head is moved along the intended line above and in rolling contact with the plate glass a scribed line represented by cracks running generally halfway across the thickness of the plate glass to facilitate breakage of the plate glass into pieces along such scribed line, said glass scribing disc comprising:
- a round flat body having a thickness within a range of 0.6 to 5 mm and having a diameter within the range of 1 to 20 mm;
- said round flat body having opposite first and second round surfaces and first and second outer peripheral surfaces extending from respective said first and second round surfaces to converge at an angle within a range of 90.degree. to 160.degree. to thereby define a peripheral scribing edge;
- said peripheral scribing edge having defined therein a series of circumferentially alternating grooves and protrusions;
- and
- each of said protrusions having a radial height within a range of 2 to 20 .mu.m as measured in a direction radially outwardly of said round flat body from a base of adjacent grooves, each pair of adjacent protrusions being spaced from each other in a direction circumferentially of said round flat body by a pitch of 20 to 200 .mu.m.
5 more elements
A glass scribing tool comprising:
- a generally elongated handle having first and second ends opposite to each other;
- and
- a glass scribing disc rotatably mounted on one of said first and second ends of said handle for defining on a plate glass when said handle is moved along an intended line above the plate glass with said disc held in rolling contact with the plate glass a scribed line represented by cracks running generally halfway across the thickness of the plate glass to facilitate breakage of the plate glass into pieces along such scribed line, said glass scribing disc comprising:
- a round flat body having a thickness within a range of 0.6 to 5 mm and having a diameter within a range of 1 to 20 mm;
- said round flat body further having opposite first and second round surfaces and first and second outer peripheral surfaces extending from respective said first and second round surfaces to converge at an angle within a range of 90.degree. to 160.degree. to thereby define a peripheral scribing edge;
- said peripheral scribing edge having defined therein a series of circumferentially alternating grooves and protrusions;
- and
- each of said protrusions having a radial height within a range of 2 to 20 .mu.m as measured in a direction radially outwardly of said round flat body from a base of adjacent grooves, each pair of adjacent protrusions being spaced from each other in a direction circumferentially of said round flat body by a pitch of 20 to 200 .mu.m.
5 more elements
A glass scribing disc for forming a scribed line on a brittle plate by generating vertical cracks due to brittle fracture thereof, said glass scribing disc comprising:
- a peripheral portion defined by first and second circumferentially extending beveled surfaces that converge radially outwardly and that define therebetween an obtuse angle, that intersect at a circumferential line extending along a radially outermost portion of said disc and that form a circumferentially extending ridge;
- said ridge including circumferentially alternately arranged first portions and second portions;
- each said first portion including a radial protrusion defined by said first and second beveled surfaces and having an arc-shaped cutting edge extending along said circumferential line;
- and
- each said second portion comprising a recess extending radially inwardly from said circumferential line to a depth of from 2 to 20 .mu.m.
2 more elements
An automatic glass scribing machine comprising:
- a table for supporting thereon a brittle plate to be scribed;
- a cutter head provided at a position above said table;
- at least one of said cutter head and said table being supported by means for creating relative movement therebetween in a direction parallel to a support surface of said table;
- and
- a glass scribing disc supported by said cutter head for, upon said relative movement, forming a scribed line on the brittle plate by generating vertical cracks due to brittle fracture thereof, said glass scribing disc comprising:
- a peripheral portion defined by first and second circumferentially extending beveled surfaces that converge radially outwardly and that define therebetween an obtuse angle, that intersect at a circumferential line extending along a radially outermost portion of said disc and that form a circumferentially extending ridge;
- said ridge including circumferentially alternately arranged first portions and second portions;
- each said first portion including a radial protrusion defined by said first and second beveled surfaces and having an arc-shaped cutting edge extending along said circumferential line;
- and
- each said second portion comprising a recess extending radially inwardly from said circumferential line to a depth of from 2 to 20 .mu.m.
7 more elements
A glass scribing tool comprising:
- an elongated handle having opposite first and second ends;
- and
- a glass scribing disc, rotatably mounted on one of said first and second ends of said handle, for forming a scribed line on a brittle plate by generating vertical cracks due to brittle fracture thereof, said glass scribing disc comprising:
- a peripheral portion defined by first and second circumferentially extending beveled surfaces that converge radially outwardly and that define therebetween an obtuse angle, that intersect at a circumferential line extending along a radially outermost portion of said disc and that form a circumferentially extending ridge;
- said ridge including circumferentially alternately arranged first portions and second portions;
- each said first portion including a radial protrusion defined by said first and second beveled surfaces and having an arc-shaped cutting edge extending along said circumferential line;
- and
- each said second portion comprising a recess extending radially inwardly from said circumferential line to a depth of from 2 to 20 .mu.m.
5 more elements
Dependencies are inferred from the claim text.