A cutter edge is pressed against a brittle-material substrate so that a protruding portion of the cutter edge is positioned between a first edge of the brittle-material substrate and a side portion of the cutter edge and that a side portion of the cutter edge is positioned between the protruding portion of the cutter edge and a second edge of the brittle-material substrate. A scribe line is formed by a scratch between a first position closer to the first edge of the first and second edges and a second position closer to the second edge of the first and second edges. After the formation of the scribe line, a crack is extended in a thickness direction from the second position toward the first position along the scribe line, thus forming a crack line.

A method of manufacturing a glass sheet includes a start point forming step of forming a scribe line on a preset cutting portion of a glass sheet, a setting step of causing, through use of a support member having a groove-shaped recess, the support member to support the glass sheet having the scribe line formed thereon from one surface side so that the preset cutting portion is arranged on the recess, and a cutting step of generating a negative pressure in the recess to bend the preset cutting portion on the recess so that the one surface side protrudes, to thereby cut the glass sheet along the preset cutting portion with the scribe line as the start point. At the time of performing the cutting step, the entire recess is covered with a cover member from another surface side of the glass sheet through intermediation of the glass sheet.

A manual cutting machine includes a base plate. A front support and a rear support are fixedly arranged at two ends of the base plate. Sliding rods are mounted between the front support and the rear support. A slider is disposed around the sliding rods. A connecting block is hinged to the slider. A blade and a presser foot are connected to the bottom of the connecting rod. A push rod is connected to the top of the connecting block. The tail of the push rod is angled relative to the push rod. When the manual cutting machine is used for cutting and fracturing a board, motions of arms are reduced, and the motion range of an operator is narrowed, so that the operator can use the machine more easily and effortlessly. Meanwhile, oil can be added into an oil can to lubricate the slider in the using process, so that the service life of the manual cutting machine is prolonged, and later maintenance is reduced.

The invention relates to a cutting and separating device applicable to manual ceramic cutters, comprising: a carriage; a collapsible handle with a cutting tool; a toothed part comprising a separator for separating ceramic parts; springs for holding the toothed part in an inoperative position as well as a toothed actuator in an engaged position with the toothed part; and a manual trigger element for disengaging the toothed actuator. The rotation of the handle past a pre-determined angle causes the engagement of the toothed actuator in the toothed part; the descending rotation causes the toothed actuator to rotate the toothed part until an operative position of the separator is reached; and the actuation of the trigger element causes the release of the toothed part and the return thereof to the inoperative position.

A device for use in creating custom tiles for installation adjacent an angled vertical surface is disclosed. An example device includes first and second elongated members coupled via a hinge configured to selectively prevent pivoting at the hinge. The device further includes a slide piece coupled to the first member and configured to slide lengthwise along the first member. The slide piece may be selectively operated to prevent movement along the first member. The slide piece may further include a body. The body may comprise a longitudinal alignment element and a perpendicular lateral alignment element that together define a recess configured to receive a corner of an installed tile. The body may further include a spacer configured to selectively extend from or retract into the body. The spacer and the lateral alignment element may define a space therebetween.

A cutter edge is pressed against a brittle-material substrate so that a protruding portion of the cutter edge is positioned between a first edge of the brittle-material substrate and a side portion of the cutter edge and that a side portion of the cutter edge is positioned between the protruding portion of the cutter edge and a second edge of the brittle-material substrate. A scribe line is formed by a scratch between a first position closer to the first edge of the first and second edges and a second position closer to the second edge of the first and second edges. After the formation of the scribe line, a crack is extended in a thickness direction from the second position toward the first position along the scribe line, thus forming a crack line.

A tile cutting hand tool. The tile cutting hand tool includes a trapezoidal planar base. The planar base has a guide bar attached thereto by a first guide bar connector and a second guide bar connector. The guide bar has a slidable scoring device placed thereon. The slidable scoring device has a handle and a scoring blade. The scoring blade is capable of scoring tile. The planar base has a plurality of base supports located on a bottom side of the planar base. The base supports allow the base to be extendable. The planar base has a ruler placed thereon. The ruler is placed perpendicular to the guide bar.

A cutting head for monoguide cutters, with a self-adjusting device is provided. The self-adjusting device can include sets of bearings that comprise fixed bearings (31, 32) and an adjustable bearing (33) that act on races (11, 12) of a monoguide profile disposed on different planes. Each adjustable bearing (33) is mounted on a rocker arm (4) with a first end (41) rotatably mounted on a shaft (5) fixed to the cutting head (2), and with a second end (42) that presses against an elastic element (6) situated between the second end (42) of the rocker arm (4) and the case of the cutting head (2), the elastic element (6) determines the pressure of the bearings (31, 32, 33) against the races (11, 12) of the monoguide profile (1).

A removable ruler for manual ceramic cutters which can be rotatably mounted on the base of a manual ceramic cutter and which includes a rotary platform permanently secured to the base of the cutter by a rotary shaft; and two removable lateral extensions. The platform includes securing means for the rapid coupling and subsequent uncoupling of the lateral extensions.

Provided are a method of full body cutting a brittle material without via the bend-breaking step, an apparatus of cutting a brittle material, a method of manufacturing a brittle material, and a cut brittle material. A method of cutting a brittle material, the method comprising: a conveyance cutting step of converging and irradiating an infrared ray to the brittle material linearly along a line using an infrared line heater while moving the infrared line heater relative to the brittle material in a direction along the line, thereby cutting the brittle material along the line.