JP2000290031A - Method for cutting channel-like glass and cutting device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting device for channel-like glass which has excellent handling quality and workability as a cutting tool and is capable of easily and exactly executing cutting at the time of cutting. SOLUTION: In the method for cutting the channel-like glass 1 having a recessed shape in cross section and having a length, a wire-shaped heat source 10 is arranged along a cutting line 4 connecting the inside surfaces 3a of erecting pieces 3 and 3 on both sides of the recessed shape cross section of the channel-like glass 1 and the inside surface 2a of the base piece 2 between the inside surfaces 3a of the erecting pieces 3 and 3 respectively to a straight line shape. The inside surfaces of the recessed shape of the glass is rapidly heated along the cutting line 4 by the heat source 10 and the channel-like glass is cut along the cutting line 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called profilit glass (a registered trademark of Pilkington Co., Ltd.) which uses a glass material as it is as a glass building material. The present invention relates to a method and a cutting device used for cutting.

[0002]

2. Description of the Related Art FIG. 11 shows a conventional method of cutting channel glass. As shown in (a), the channel-shaped glass 50 is bent at right angles from the bottom piece 51 and both ends thereof, and the left and right standing pieces 52, 5 standing upright.
2 and has a predetermined length in a direction perpendicular to the cross section. The thickness of the glass is, for example, 6 mm or more. In order to cut such a channel glass 50 along its cross section,
As shown in (a), a cutter mark 54 is linearly cut by a glass cutting cutter 53 along the inner surface of the bottom piece 51 of glass and the inner surfaces of the right and left standing pieces 52, 52. (B) As shown in FIG.
The surface of the channel-shaped glass 5 is lightly hit with a hammer or the like to cause a crack to propagate along the cutter mark 54.
0 is cut along the cutter mark 54 and a cutting method is adopted.

[0003]

The above-mentioned conventional method of cutting channel-shaped glass requires skill and requires a hammer.
5, the position of the impact is finely adjusted, and the impact force is adjusted, as shown in (c), in the direction perpendicular to the cutter mark 54 (the direction to be cut) called "cutting".
That is, the cracks 56 extending in the length direction of the channel-shaped glass
Occurs and the cutting yield deteriorates. The reason is that the glass itself is itself thick, it is used as a glass building material in a block shape, etc., and the cross section is concave,
Since the residual stress remains in the direction indicated by the arrow of the bottom piece 51 as shown in (c), a crack in the length direction (longitudinal direction) easily runs. Also, as shown in (d), the cut surface 57 is irregular, and a convex portion 58 or the like is generated on the cut surface 57. When this is set up on the floor surface 59 or the like as the bottom as shown in the figure, the weight of the convex portion etc. Is supported, and stress concentration occurs in this portion, which may cause breakage.

[0004] Incidentally, as a glass cutting method, Japanese Patent Application Laid-Open Nos. Hei 5-221573 and Hei 6-219761.
The technology disclosed in Japanese Unexamined Patent Publication (Kokai) No. H10-214,878 is disclosed. The technique is to form a cutting groove partially on the outer peripheral portion of a flat glass plate, move a heating body along the cutting groove, heat the heating body along the cutting groove, and turn the glass plate into a cutting groove. Along the desired shape. In this technique, a glass tube is rotated, a portion to be cut is heated by a heater, and after natural cooling, the portion to be cut is cut by a cutting tool.

The present inventors have tried various techniques for solving the above-mentioned conventional problems in the above-mentioned channel glass cutting technique. In this process, there is a technology in the above-mentioned publication of the conventional disclosure, and in this technology, one is a flat glass, a cutting groove is formed in the flat glass in advance according to a cutting shape, and heating is performed, and the other is heating. The focus was on heating the outer periphery of the tubular glass, cutting it with a cutting tool after cooling. However, a channel-shaped glass having a concave cross section called a profilit glass (a registered trademark of Pilkington Co.)
Since the thickness of the glass itself is thick, and it is used as a glass building material by joining in a block shape by itself, various attempts are made as to whether or not it can be cut by the above heating method, and by heating, this thickness of the wall is increased. The present invention has been made based on the finding that the seed glass can be easily and accurately cut along the concave cross section.

An object of the present invention is to cut a channel-like glass used as a block-shaped glass building material which can cut the channel-like glass along a cutting line accurately and easily without skill. Provide a way.
Also, an object of the present invention is to provide a channel-shaped glass cutting apparatus which is excellent in handleability and workability as a cutting tool when cutting, and can easily and accurately perform cutting.

[0007]

In order to solve the above-mentioned problems, a first aspect of the present invention is a method of cutting a channel-shaped glass having a concave cross section and a length. A linear heat source is arranged along a cutting line that linearly connects the inner surface of the upright piece and the inner surface of the bottom piece between the inner surfaces of the upright piece, and the heat source uses the concave inner surface of the glass along the cutting line. Is rapidly heated to cut the channel-shaped glass along the cutting line.

According to the first aspect of the present invention, the heat is rapidly heated by a linear heat source along a cutting line on the inner surface of the concave cross section of the channel-shaped glass, so that local thermal expansion and distortion occur, and the linear heating is performed. Accordingly, cracks are generated linearly, and the channel-shaped glass can be cut (divided) linearly along the concave cross section. Since the channel-shaped glass rapidly heats the inner surface of the concave section in a straight line, the thermal expansion and strain are distributed almost uniformly in a straight line, and as a result, cracks are generated, and the cracks are heated by the heating line. , And the channel glass can be cut (divided) along the concave cross section.

A second aspect of the present invention is a method of cutting a channel-shaped glass having a concave cross section and a length, wherein the inner surface of the upright pieces on both sides of the concave cross section of the channel-like glass and the bottom piece between the inner surfaces of the upright pieces are provided. A linear heat source is arranged along a cutting line that connects each of the inner surfaces in a straight line, and a part of a portion corresponding to the outer surface of the cutting line on the outer surface of the concave cross section of the channel-shaped glass is formed on the cutting line. Along with the cutter in advance, the heat source rapidly heats the concave inner surface of the glass along the cutting line, and cuts the channel glass along the cutting line. Features.

According to the second aspect of the present invention, a part of a corresponding portion of the outer surface of the cutting line heated rapidly in a linear manner is previously scratched, so that the scratch becomes a starting point of a crack due to local thermal expansion and strain,
Cracks are likely to be generated from scratches, and it is possible to promote quick, reliable, and easy generation of cracks.

According to a third aspect, in the first or second aspect, the concave inner surface of the glass is heated along the cutting line, and the outer surface of the concave cross section of the channel-shaped glass is heated by the heat source. A portion corresponding to the outer surface of the cutting line to be cut is cooled along the cutting line.

In the third aspect, since the outer surface of the concave cross section of the channel glass is cooled, the temperature difference between the inner and outer surfaces of the concave glass is increased, local thermal expansion and distortion are increased, and the generation of cracks is prompt and reliable. Therefore, the cutting is quick, smooth and accurate.

A fourth aspect of the present invention is a device for cutting a channel-shaped glass having a concave cross section and a length, wherein the inner surface of the upright pieces on both sides of the concave section of the channel glass and the bottom piece between the inner surfaces of the upright pieces are provided. This is a channel glass cutting device provided with a linear heat source disposed along a cutting line connecting each of the inner surfaces in a straight line and having a small gap from the inner surface.

According to a fourth aspect of the present invention, the concave inner surface of the channel glass is easily and reliably heated in a straight line along the cutting line, and is cut linearly along the concave cross section of the channel glass. it can.

According to a fifth aspect of the present invention, in the fourth aspect, the linear heat source is provided in an outer peripheral portion, and a heat insulating holder having an outer peripheral shape conforming to the inner surface of the concave cross section of the channel-shaped glass; A handle attached to and detached from the channel-shaped glass, and a power cord connecting a linear heat source and an external power source are provided.

According to a fifth aspect of the present invention, the linear heat source provided inside the outer peripheral portion of the holder can reliably perform linear heating along the cutting line of the inner surface of the concave cross section of the channel-shaped glass, and can be carried and transported with a handle. Can be easily performed, can be easily attached to and detached from the channel-shaped glass, and the positioning of the linear heat source along the cutting line can be performed accurately and easily.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a schematic perspective view showing a method of cutting the channel-shaped glass 1.
Left and right standing pieces 3, which stand at right angles from both ends of the bottom piece 2,
3 having a concave cross-section and having a predetermined length while maintaining the cross-sectional shape. The channel-shaped glass 1 has a width W shown in FIG. 1 of, for example, 262 mm, a height H of, for example, 60 mm, and a plate thickness of 7 mm.

A line 4 to be cut in advance (hereinafter referred to as a cutting line) is formed on the inner surface 1a of the bottom piece 1 of the channel-shaped glass 1 and the inner surfaces 2a, 2a of the left and right upstanding pieces 2, 2 at the cut position. Mark it. The cutting line 4 is linearly continuous along the concave cross section of the inner surface 1a of the bottom piece 1 and the inner surfaces 2a, 2a of the left and right upright pieces 2, 2, and is perpendicular to the length direction of the channel glass. wear. The cutting line 4 is a reference for the cut portion of the channel-shaped glass 1, and is a marking line serving as a mere mark for cutting, which is not damaged by a cutter as in the related art.

A linear heat source is provided on the inner surface side of the cutting line 4 indicated on the inner surface of the concave cross section of the channel-shaped glass 1 so as to maintain a predetermined gap with respect to the cut portion indicated by the cutting line 4. Is disposed. Since FIG. 1 is a schematic perspective view, the heating wire 10 is shown naked. FIG. 2 shows a hot wire 1
FIG. 3 is a longitudinal sectional view along a concave section showing the relationship between 0 and the channel-shaped glass 1, and FIG. 3 is a sectional view taken along line 3-3 in FIG.

The heating wire 10 holds a small gap S with respect to the inner surface of the concave section of the channel-shaped glass 1 (the inner surface 2a of the bottom piece 2 and the inner surfaces 3a of the right and left standing pieces 3, 3). It is arranged concavely along the inner surface. Heat wire 10 and inner surface 2a of bottom piece 2, inner surfaces 3a of left and right standing pieces 3 and 3a
The distance from the inner surface is uniform in any part.

The heating wire 10 is connected to the cutting device 1 shown in FIG.
It is held at 1. The cutting device 11 includes a holder 12 which is detachably fitted to the bottom surface (the inner surface 2a of the bottom piece 2) of the concave inner surface of the channel-shaped glass 1 and the inner surfaces on both sides (the inner surfaces 3a, 3a of the left and right standing pieces 3, 3). The heating wire 10 is arranged in a convex shape along the bottom and both sides of the convex outer peripheral portion 12 a of the holder 12. Terminal portions at both ends are connected to the power supply 15, the power is turned on when the switch 16 is turned on, and the current is rapidly increased when the power is turned on. It is set to generate heat and perform rapid heating.

As shown in FIG. 3, the holder 12 is held in a storage recess 13 provided inside an outer peripheral portion 12a of the holder 12, and the storage recess 13 has a slit 14 of a small width which opens toward the outer peripheral portion 12a. The outer periphery 12a is held in contact with the concave inner surface of the channel-shaped glass 1, that is, the inner surface 2a of the bottom piece 2 and the inner surfaces 3a, 3a of the left and right upright pieces 3, 3.
A small gap S having a predetermined height was maintained between the open end of the slit 14 connecting the heating wire 10 and the outer peripheral portion 12a and the outer peripheral portion 12a.

In the above, the hot wire 10 is supplied with power from the power supply 15 when the switch 16 is turned on, causing the hot wire 10 to generate heat rapidly and to be heated rapidly. As a result, the concave inner surface of the channel-shaped glass is rapidly and linearly heated along the cutting line 4 by the hot wire 10, and the inner surface is rapidly heated. Part of the inner surface of the glass-like glass 1 is locally thermally expanded and distorted along the concave section in a straight line. As described above, since the concave inner surface is heated in a straight line with the hot wire 10 arranged in a straight line along the concave cross section, a crack is generated in a straight line, and the channel glass is cut (divided) straight along the concave cross section. )can do. In addition, since the channel-shaped glass rapidly heats the inner surface of the concave cross section in a straight line, thermal expansion and strain are distributed almost uniformly in a straight line, and as a result, cracks are generated, but the cracks are formed along the straight line. The channel-shaped glass can be cut (divided) along a concave cross section by developing straight along the heated line.

As described above, the channel-shaped glass 1 can be cut along the cutting line 4 on which the hot wire 10 is disposed by rapidly heating the hot wire 10 in a straight line along the concave inner surface of the channel-shaped glass 1. . On the inner surface of the concave section,
The heating wire 10 arranged in a straight line along the inner surface cuts (divides) due to rapid heating, thermal expansion and distortion caused by the heating, so that the cut surface has little unevenness. The irregularities are negligible when building or joining. The above is the cutting method according to the first aspect of the present invention.

FIG. 4 is a schematic perspective view showing the invention according to claim 2 of the present invention. In the present invention, the cutting method is the same as the method shown in FIGS. When cutting the channel-shaped glass 1 by the above-described method, a part of the outer surface 2b, 3b, 3b of the channel-shaped glass 1, for example, a part near the corner portion along the cutting line 4 of the outer surface 2b of the bottom piece 2, A linear scratch 5 is made in advance with a cutter or the like.
The scratch 5 only needs to be a starting point of crack generation upon heating by the above-mentioned heating wire 10, and therefore may be only a part as shown in FIG.

In the same manner as described above, the heat is rapidly heated in a straight line along the concave inner surface of the channel-shaped glass 1 by the heat wire 10, and as described above, local thermal expansion and distortion occur, so that the concave cross section is crossed. Although the cracks are generated in a straight line as described above, the scratches 5 serve as starting points of cracks due to local thermal expansion and strain due to the above-mentioned scratches 5, and cracks tend to be generated starting from the scratches. Easy production can be promoted. Therefore, the cutting (division) of the channel glass 1 can be performed quickly, smoothly, reliably, and easily.

FIGS. 5 and 6 show the third aspect of the present invention.
In the third aspect, a cooling method is added to the first and second aspects of the present invention. The configuration other than the cooling method is the same as that described above. Omitted. FIG. 5 is a longitudinal sectional view similar to FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. The outer surface of the channel glass 1 in which the above-mentioned heat wire 10 is arranged on the concave inner surface, that is, the cutting line 4 of the outer surface 2b of the bottom piece 2 and the outer surfaces 3b, 3b of the right and left standing pieces 3, 3, and accordingly, the portion where the heat wire 10 is arranged. The cooling device 20 is arranged along the outer surface corresponding to FIG.

The cooling device 20 is a hollow cylindrical concave portion 20 arranged with a small gap from the outer surface having a concave cross section.
a (see FIG. 6), and a plurality of cooling air outlets 21... are provided at portions facing the outer surface 2b of the bottom piece 2 and the outer surfaces 3b, 3b of the left and right standing pieces 3, 3. The concave portion 20a is connected to a cooling air supply pipe 22. The cooling air supply pipe 22 has a fan 23 at a downstream portion thereof, and a storage portion 24 for a refrigerant such as dry ice at an upstream portion thereof. A switching valve 25 is provided on the downstream side.

As described above, as shown in FIG. 5, the cutting device 11 is fitted along the inner surface of the concave cross section of the channel glass 1 and the heating wire 10 is arranged along the cutting line with a small gap from the inner surface. . On the other hand, the switching valve 2 of the cooling device 20
5 is opened, the fan 23 is driven, and the cooling air is
To the concave portion 20a. Since the concave portion 20a is provided with the outlets 21 as described above, the cooling air flows from the outlets 21 to coincide with the inner surface of the channel-shaped glass 1 which is rapidly heated by the heating wire 10 and the vicinity thereof. The outer surface of the part is sprayed as shown by arrows in FIGS. 5 and 6 to cool the outer surface.

At the same time, as described above, the inner surface on the opposite side is rapidly heated by the heating wire 10 along the concave inner surface of the channel glass 1 and along the inner surface of the cooling portion. Since the inner surface is rapidly heated and the outer surface is cooled to a room temperature or lower, the temperature difference between the inner and outer surfaces of the concave section of the channel-shaped glass becomes extremely large, and this portion during local rapid heating by the hot wire 10 is generated. Thermal expansion and strain become extremely large. As a result, crack generation along the cutting line is rapid, smooth,
It will surely be done. Therefore, the cutting along the concave cross section of the channel-shaped glass along the cutting line by the heating wire 10 is quickly, smoothly, and accurately performed.

FIG. 7 is a perspective view of the cutting device, showing a state before mounting on the channel glass 1. Since the channel-shaped glass 1 has the same structure as described above, the same portions are denoted by the same reference numerals, and detailed description will be omitted. As shown in FIG. 7, the outer surface 2 of the bottom piece 2 is interposed between the pillow members 6.
Place and hold b

The cutting device 30 includes a concave inner surface of the channel glass 1, that is, an inner surface 2 a of the bottom piece 2, right and left standing pieces 3, 3.
The holder 31 is made of a heat-resistant material and is fitted to the inner surfaces 3a of the inner surface 3a. A heating wire 33 for heating provided in the back of the slit 32 provided at the bottom, holding plates 34 and 34 provided at the front and rear of the holder 31, upper surfaces thereof, and an outer frame 35 provided at the front and rear, An inverted concave handle 36 provided on the upper surface 35a of the frame 35 is provided. The built-in heat wire 33 is connected to an external power supply (not shown) via a cord 37, and a switch (not shown) is provided in the middle of the cord 37.

In the embodiment, the protruding portions 30 are provided on the left and right sides on the upper part.
a, 30a, and the overall shape in a front-rear view is substantially T-shaped. Before and after, there are provided leg portions 39 for holding the cutting device 30 so that the outer peripheral portion 31 of the holder 31 does not contact the floor surface or the like when the holder 31 is placed on the floor or the like when not in use. In the above cutting device 30, the operator holds the handle 36, and the inner surface of the channel glass 1 to be cut is marked in advance with the cutting line 4 as a mark.

FIG. 8 is a side view showing a state in which the cutting device 30 is set on the inner surface of the cut portion of the channel glass 1, and FIG. 9 is a front view of the same. The cutting device 30 is fitted through the handle 36 with the outer peripheral portion 31a of the holder 31 and the front and rear portions of the outer frame 35 from above the concave inner surface of the channel glass 1 into the concave inner surface. The outer peripheral portion 31a of the holder 31 abuts inside the concave inner surface, and in this state, FIG. 1 is a sectional view taken along line 10-10 of FIG.
Indicated by 0. As shown in FIG. 10, the outer peripheral portion 31a of the holder 31 is in contact with the concave inner surface of the channel-shaped glass 1, and the hot wire 33 is embedded in the depth of the slit 32 that is opened outward from the outer peripheral portion 31a. A predetermined small gap S is held between the channel-shaped glass 1 and the concave inner surface.

The legs 39 at the four corners are, as shown in FIG. 9, the right and left standing pieces 3 of the channel glass 1 with the holder 31 set on the concave inner surface of the channel glass 1.
3 is arranged vertically outside, and there is a gap between the upright pieces 3 and 3. After setting in the concave inner surface of the channel glass 1 as shown in FIGS. 8 to 10, a switch (not shown) provided on the cord 37 is turned on, and the heating wire 10 is energized to generate heat rapidly, thereby causing the channel glass 1 to generate heat. Is heated rapidly as described above, and the channel-shaped glass 1 is cut from the cutting line 4 as described above. After the cutting, the cutting device 30 is lifted and removed via the handle 36.

As described above, in the embodiment, the cutting line is straight on the inner surface of the cross section as shown in FIG. 1, and the cross section is cut straight along the cross section. By setting, arranging the heat rays along the diagonal cutting line and performing rapid heating, it is also possible to cut diagonally, and when implemented, straight diagonal cutting is easily possible Was confirmed. Therefore, a straight cut includes a straight oblique cut.

[0037]

According to the present invention, the following effects are exhibited by the above configuration. Claim 1 is a method for cutting a channel-shaped glass having a concave cross section and a length, wherein each of an inner surface of an upright piece on both sides of a concave cross section of the channel glass and an inner surface of a bottom piece between the inner faces of the upright piece. A linear heat source was arranged along a cutting line connecting straight lines, and the heat source rapidly heated the concave inner surface of the glass along the cutting line to cut the channel-shaped glass along the cutting line. .

According to the first aspect of the present invention, the concave inner surface of the channel glass is rapidly and linearly heated along the cutting line by the linear heat source, and the inner surface of the concave cross section is rapidly heated. Therefore, a part of the inner surface of the channel-shaped glass along the heat source, along the concave cross section, local thermal expansion and strain occurs in a straight line, cracks in a straight line along the cutting line, concave section Can be cut (divided) in a straight line along the line. At this time, the above-mentioned channel-shaped glass rapidly heats the inner surface of the concave cross section in a straight line, so that thermal expansion and strain are distributed almost uniformly on the straight line, and the cracks are formed along the straight line by the thermal expansion and strain. The channel-shaped glass can be cut (divided) along a concave cross section by developing straight along the heated line.

As described above, the channel-shaped glass is rapidly heated by the hot wire in a straight line along the concave inner surface of the channel-shaped glass, whereby the channel-shaped glass is cut along the cutting line where the hot wire is arranged due to local thermal expansion and distortion. Because it can be done, without the need for special skills as in the past, even an unskilled person can easily, accurately and reliably cut the channel-shaped glass along the concave section along the cutting line. The glass can be cut, and the work of cutting the channel glass can be facilitated. In addition, the inner surface of the concave cross section is cut (divided) by rapid heating by heat rays arranged in a straight line along the inner surface, resulting in thermal expansion and distortion, so that the cut surface has very little unevenness. However, even if unevenness occurs, it is minute, and it becomes negligible unevenness at the time of building and joining, without the need for subsequent correction of the cut surface,
This point is also advantageous in terms of work, and since a crack or the like does not occur in a direction perpendicular to the cut surface, the cutting yield is also improved. Also, as described above, the cut surface is extremely small in irregularities, and the cut surface is a fine unevenness that can be neglected even if the rough surface is generated, so that the appearance is good, and the cut surface is smooth. As a result, the strength of the cut surface is improved, the wind pressure resistance when built as a building material is improved, and the effect of expanding the area where success is possible is exhibited.

A second aspect of the present invention is a method of cutting a channel-shaped glass having a concave cross section and a length, wherein the inner surface of the upright pieces on both sides of the concave section of the channel glass and the inner surface of the bottom piece between the inner surfaces of the upright pieces. A linear heat source is arranged along a cutting line connecting each of the straight lines, and a part of a portion corresponding to the outer surface of the cutting line on the outer surface of the concave cross section of the channel glass is formed along the cutting line. Scratch in advance with a cutter,
The concave inner surface of the glass was rapidly heated along the cutting line to cut the channel glass along the cutting line.

According to the second aspect, a part of the outer surface of the cut line on the inner surface which is rapidly heated by the linear heat source is scratched so as to coincide with a part of the cut line. When heating is carried out, the scratch becomes the starting point of cracks due to local thermal expansion and strain, cracks tend to be generated starting from the scratch, rapid cracking,
Reliable and easy production can be promoted. Therefore, in addition to the effect of the first aspect, the cutting (dividing) of the channel glass can be performed quickly, smoothly, reliably, and easily.

According to a third aspect of the present invention, there is provided a cutting method according to the first or second aspect, wherein the concave inner surface of the glass is heated along the cutting line, and the outer surface of the concave cross section of the channel-shaped glass is heated by a heat source. The part corresponding to the outer surface of the line was cooled along the cutting line.

According to the third aspect, since the inner surface is rapidly heated by the linear heat source and the outer surface is cooled to a room temperature or lower, the temperature difference between the inner and outer surfaces of the concave cross section of the channel glass becomes extremely large. In addition, the thermal expansion and strain of this portion at the time of local rapid heating by a linear heat source become extremely large, and as a result, cracks along the cutting line are generated quickly, smoothly and reliably. Therefore, the above claim 1
In addition to the effects of the above, or the effect of the second aspect, the cutting along the concave cross section of the channel glass along the cutting line by the heat source can be performed very quickly, smoothly, and accurately.

A fourth aspect of the present invention is an apparatus for cutting a channel-shaped glass having a concave cross section and a length, wherein an inner surface of a standing piece on both sides of the concave section of the channel glass and an inner surface of a bottom piece between the inner surfaces of the rising piece. And a linear heat source arranged along a cutting line connecting each of them linearly and arranged with a small gap from the inner surface.

According to a fourth aspect of the present invention, the inner surface of the upright pieces on both sides of the concave section of the channel-shaped glass and the inner surface of the bottom piece between the inner surfaces of the upright pieces are arranged with a small gap from the inner surface along a cutting line that linearly connects the inner surfaces. Since it is provided with a linear heat source, the cutting device can be fitted and set on the inner surface of the channel-shaped glass, and the channel-shaped glass can be heated in a straight line along the cutting line while securing a gap with the inner surface. Thus, the concave inner surface can be accurately heated, and the cutting of the channel-shaped glass of claim 1 can be easily and reliably performed. In terms of structure, the heating wire and the heating wire may be provided so as to maintain a small gap with the concave inner surface of the channel-shaped glass, and a heating wire energizing means may be provided. It is compact and easy to set, carry and carry.

According to a fifth aspect of the present invention, in the fourth aspect, a linear heat source is provided in the outer peripheral portion, and a heat insulating holder having an outer peripheral shape conforming to the inner surface of the concave cross section of the channel glass is provided. And a power supply cord for connecting a linear heat source to an external power supply.

According to the fifth aspect, the linear heat source provided on the outer periphery of the heat-insulating holder facilitates and securely fits and sets the channel-shaped glass, and also has an inner surface of the concave cross-section of the channel-shaped glass. The linear heating along the cutting line can be reliably performed. In addition, fitting to channel-shaped glass with a handle,
It can be set easily and accurately, can be easily carried and transported, can be easily attached to and detached from the channel-shaped glass, and the positioning of the linear heat source along the cutting line can be performed accurately and easily. Also, by connecting the power cord to the power source on site,
The channel glass can be easily cut at a site or the like.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a method of cutting a channel glass.

FIG. 2 is a longitudinal sectional view along a concave section showing a relationship between a hot wire and a channel glass.

FIG. 3 is a sectional view taken along line 3-3 in FIG.

FIG. 4 is a schematic perspective view showing the invention according to claim 2;

FIG. 5 is a longitudinal sectional view similar to FIG. 2, showing the invention according to claim 3;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

FIG. 7 is a perspective view of the cutting device, showing a state before being mounted on the channel-shaped glass 1;

FIG. 8 is a side view showing a state in which the cutting device is set on an inner surface of a cut portion of the channel-shaped glass.

FIG. 9 is a front view of a state in which the cutting device is set on the inner surface of the cut portion of the channel-shaped glass.

FIG. 10 is a sectional view taken along line 10-10 of FIG. 9;

11A and 11B are explanatory diagrams showing a conventional channel glass cutting method, in which FIG. 11A shows a state in which a cutter mark is formed by a cutter, FIG.
(C) is a diagram showing the occurrence of cracks, and (d) is a diagram showing a state where the cut channel-like glass end is installed on the floor surface.

[Explanation of symbols]

1 ... channel-shaped glass, 2 ... bottom piece, 2a ... inner surface,
2b ... outer surface, 3 ... standing piece, 3a ... inner surface, 3b ...
Outer surface, 4 ... cut line, 5 ... scratch, 10 ... linear heat source,
S: gap, 11 cutting device, 20: cooling device for cooling the outer surface, 30: cutting device, 31: heat insulating holder, 33: linear heat source, 36: handle, 37: external power cord.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Seiji Okubo 3-5-11 Doshomachi, Chuo-ku, Osaka-shi, Osaka F-term in Nippon Sheet Glass Co., Ltd. (reference) 3C060 AA08 CF04 4G015 FA06 FB00

Claims (5)

[Claims] 1. A method for cutting a channel-shaped glass having a concave cross section and a length, comprising: an inner surface of an upright piece on both sides of a concave cross section of the channel glass; and an inner surface of a bottom piece between the inner surfaces of the upright piece. A linear heat source is arranged along a cutting line connecting the straight lines, and the heat source rapidly heats the concave inner surface of the glass along the cutting line, and the channel-shaped glass is cut along the cutting line. A channel-shaped glass cutting method, characterized in that the channel-shaped glass is cut. 2. A method for cutting a channel-shaped glass having a concave cross section and a length, comprising: an inner surface of an upright piece on both sides of a concave cross section of the channel glass; and an inner surface of a bottom piece between the inner surfaces of the upright piece. A linear heat source is arranged along a cutting line connecting the straight lines, and a part of a portion corresponding to the outer surface of the cutting line on the outer surface of the concave cross section of the channel-shaped glass is preliminarily arranged along the cutting line. A cutter, and the heat source rapidly heats the concave inner surface of the glass along the cutting line to cut the channel-shaped glass along the cutting line. How to cut channel glass. 3. A concave inner surface of the glass is heated along the cutting line, and a portion of the concave cross section of the channel-shaped glass, which coincides with the outer surface of the cutting line heated by the heat source, is cut. 3. The method according to claim 1, wherein the cooling is performed along the line. 4. An apparatus for cutting a channel-shaped glass having a concave cross section and a length, wherein an inner surface of an upright piece on both sides of the concave section of the channel glass and an inner surface of a bottom piece between the inner surfaces of the upright piece, respectively. And a linear heat source disposed along a cutting line that linearly connects the heat sink and a small gap with the inner surface. 5. A heat-insulating holder having an outer peripheral shape that fits the linear heat source in an outer peripheral portion thereof and conforms to an inner surface of a concave cross section of the channel glass, and a handle for attaching and detaching the holder to and from the channel glass. 5. The apparatus according to claim 4, further comprising: a power supply cord for connecting a linear heat source to an external power supply. 6.