JP2019060206A - Lap joint cutter - Google Patents

Abstract

To efficiently cut, with one hand, an edge of a waterproof sheet which is easy to carry and is located on the upper side at a work to form a wrap part of the waterproof sheet at a corner between a vertical wall surface and a floor surface of a rooftop of a building or at a corner between vertical wall surfaces.SOLUTION: A lap joint cutter comprises: a main body 3 having a grip at an upper portion and rotatably supporting a round blade 2 at a lower portion; a guide 4 provided laterally and removably projecting on the side of the main body 3 and having a constant projecting width along the longitudinal direction of the main body 3; and an underlayment 5 provided below the main body 3 and forming space portions S1, S2 into which an edge of a waterproof sheet can be inserted between the lower end of the main body 3 and itself. In the space portions S1 and S2, a cutting edge portion of the round blade 2 is positioned so as to be able to cut the edge of the waterproof sheet.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lap joint cutter.

  In order to lay a waterproof sheet (rubber-based, vinyl chloride-based, etc.) on the roof of a building, for example, as shown in FIG. 15, an adhesive is applied on the roof floor surface 101 and waterproofed thereon. By bonding the sheet 102, the entire floor surface 101 is provided. In such a construction method, the waterproof sheet 102 on the floor surface 101 is an inward vertical wall surface of the vertical wall portion 103 (parapet) at a corner portion (corner portion) between the vertical wall surface on the roof of the building and the floor surface. The sheet wrap portion is formed by superposing a fixed width (40 mm or more) of the lower end edge 104a of the waterproof sheet 104 bonded to the upper side of the waterproof sheet 102 laid on the floor surface 101 directly below the vertical wall surface. It is necessary to carry out welding construction or fusion construction.

  Therefore, the waterproof sheet on the vertical wall side hangs down from the vertical wall of the vertical wall 103 through the corner connected to the floor 101 and overlaps the upper surface of the waterproof sheet 102 on the floor that is laid on the floor 101 At the laying site, one side edge of the ruler 201 having a width corresponding to the predetermined width is arranged at the lower end corner of the vertical wall so that the lower end 104a of the lower wall 104 is aligned with the predetermined width from the lower corner of the vertical wall of the vertical wall 103 The ruler with the underlayment 203 (a metal plate such as a stainless steel plate) disposed under the waterproof sheet 104 of the vertical wall surface so that the waterproof sheet 102 on the floor surface 101 is not damaged by the cutter knife 202 while pressing. A cutter knife 202 is put on the other side edge of 201 and cut in the thickness direction of the waterproof sheet 104 on the vertical wall so as to cut while protecting the waterproof sheet 102 on the floor surface 101 side. That.

  Since the cutting operation of the edge of such a waterproof sheet 104 is performed using a ruler 201 and an underlayment 203 in addition to the cutter knife 202 while moving them, it is a troublesome operation. As a construction method, in addition to the above, an anchor fixing method (mechanical fixing method) is also known.

  Therefore, one end edge of the ruler body is formed into a linear positioning edge, and a guide slit of a predetermined length parallel to the positioning edge is penetrated in the thickness direction in the center of the ruler body and the positioning edge The left and right grip pieces are projected upward at adjacent left and right edges, and from the base end opposite to the positioning edge, the upper and lower connecting portions of predetermined upper and lower dimensions are extended downward, and from the lower end of the upper and lower connecting portions, the guide The ruler main body has a base plate portion which is longer than the slit and does not reach just below the positioning edge and which is set to either the right or left width of the ruler main body equal to or slightly wider than the ruler main body There has been proposed a ruler for cutting a sheet, which has been stretched and integrated so as to have a parallel posture (see, for example, Patent Document 1).

  If this ruler is used, the lower end edge portion of the waterproof sheet stuck to the vertical wall surface hangs down on the waterproof sheet pasted onto the roof floor surface in the L-shape of the vertical cross section, and The lower end edge portion is sandwiched between the base plate portion of the ruler and the ruler main body, and the linear positioning edge is abutted against the inner longitudinal wall surface with the waterproof sheet interposed, and cut into one selected guide slit. The cutter blade, which is a tool, is inserted downward from above, penetrates in the thickness direction of the waterproof sheet on the vertical wall side, reaches the upper surface of the base plate, and grips the left and right grip pieces while fixing the cutter blade to the guide slit And move the linear positioning edge along the inner longitudinal wall surface so that it slides horizontally from either one end to the other end, and the lower edge portion of the waterproof sheet on the longitudinal wall side has a fixed width (a fixed joint Width) only on the floor side It can be cut so as to overlap on the water sheet. Therefore, after cutting, the lower end of the waterproof sheet on the vertical wall side is superimposed on the waterproof sheet edge portion on the floor surface side, and it is possible to form a wrap portion by bonding with an adhesive.

JP 2012-225052 A (0029, FIG. 6)

  When the ruler described in Patent Document 1 is used, the linear positioning edge is the inner longitudinal wall surface while the left and right grip pieces are gripped by the other hand while the state in which the cutter blade is inserted into the guide slit is fixed by one hand. The work efficiency is poor because the operator bends forward and works using both hands in such a way as to slide so as to slide from either one end side to the other end side horizontally in the horizontal direction. Moreover, since the positioning edge which has a guide function is a structure which becomes one side edge of a base board part, the position of the guide slit which inserts a cutter edge can not be changed. If a plurality of guide slits are provided in parallel, the width of the sheet cutting ruler can not be made narrow and small, which is inconvenient to carry.

  The present invention is easy to carry, and in the work of forming the wrap portion of the waterproof sheet at the corner between the vertical wall and floor of the roof of the building or at the corner between the vertical and vertical wall, Provided is a lap joint cutter capable of efficiently cutting an edge of a tarpaulin to be positioned by one-handed operation.

  The invention according to claim 1 is located on the upper side when the waterproof sheet is wrapped in a corner portion between the vertical wall surface and floor surface of the roof of the building or a corner portion between the vertical wall surface and the vertical wall surface. A lap joint cutter used to cut the edge of a tarpaulin to be cut with a blade to make the width of the portion to be wrapped constant, and having a grip at the top and supporting the blade A main body, a guide having a protruding portion laterally and laterally releasably provided on a side portion of the main body and having a projecting portion with a fixed width along the longitudinal direction of the main body; An underlayment is formed between the lower end and the space which can insert the edge of the waterproof sheet, and the cutting blade portion of the cutter can cut the edge of the waterproof sheet in the space. It is located The features.

  In this way, when the lower end edge of the waterproof sheet that is positioned above the wrap portion passes through the space portion of the lower layer that is positioned above the wrap portion during the cutting operation, the waterproof sheet that is positioned below the wrap portion The lower end edge of the waterproof sheet to be positioned on the upper side can be cut to a certain width without damaging the Therefore, the edge of the waterproof sheet to be positioned on the upper side can be efficiently cut by the operation of one hand. Then, by overlapping and adhering the waterproof sheet to be positioned at the upper side on the waterproof sheet to be positioned at the lower side, it is possible to form a wrap portion having a constant width. The guide is provided so as to be removable, and it is compact and convenient to carry when the guide is removed.

  The mounting plate according to claim 2, further comprising: a mounting plate having an upper end attached to the main body and a lower end projecting downward from the main body, the underlayment being attached to the lower end of the mounting plate; It is desirable that the space portions are respectively formed on both sides in the longitudinal direction of the main body with the n.

  In this way, the underlayment can be easily provided below the main body.

  As described in claim 3, the underlayment has a pair of underlaying elements arranged in parallel, and the pair of underlaying elements are arranged on both sides in the width direction of the mounting plate; Preferably, a gap is formed between one of the pair of underlaying elements and the mounting plate, in which the cutting edge portion of the cutting tool is located.

  In this case, the cutting blade portion of the cutting tool is disposed between the underlaying elements, whereby the cutting blade portion for cutting can be easily provided in the space above the underlayment.

  The cutter may be a round blade rotatably provided on the main body, or the cutter may be a pair of flat blades as described in claim 5. It is desirable that the cutting edge portion of the blade is directed to the insertion side of the edge of the waterproof sheet.

  In this way, the lower edge of the waterproofing sheet on the side of the vertical wall has a constant width necessary to form the wrap portion, regardless of the relative movement in the longitudinal direction of the main body, in either direction. Can be cut into

  The invention according to claim 6 is located on the upper side when the waterproof sheet is wrapped in a corner portion between the vertical wall surface and floor surface of the roof of the building or a corner portion between the vertical wall surface and the vertical wall surface. A lap joint cutter used to cut the edge of a tarpaulin to be cut with a blade to make the width of the portion to be wrapped constant, and having a grip at the top and supporting the blade And a guide provided so as to protrude laterally on the side of the main body and removable and having a constant projecting width along the longitudinal direction of the main body, and the cutting edge portion of the cutting tool is The end of the waterproof sheet is provided so as to be cutable below the main body, and the cutting tool has a hook shape at its tip portion and only the hook inner portion is the cutting blade portion. With That.

  In this way, when the lower end edge of the waterproof sheet that is to be positioned on the upper side passes through the upper space portion of the cutting blade portion of the cutter during the cutting operation, the waterproof sheet that is to be positioned on the lower side The lower end edge of the waterproof sheet to be positioned on the upper side can be cut to a certain width without damaging the

  As described in claim 7, it is desirable that a pair of pressing rollers for pressing the waterproof sheet at the time of cutting is rotatably provided on the side portion of the main body provided with the guide.

  In this way, the pressing roller reliably presses the waterproof sheet at the time of cutting.

  In this case, as described in claim 8, it is preferable that the pressing roller be provided with the guide interposed therebetween.

  In this way, the pressing roller can be provided without interference with the guide.

  In addition, as described in claim 9, on the side opposite to the side of the main body on which the guide is provided, a pair of propulsion assisting rollers for rotatably supporting propulsion at the time of cutting are rotatably provided. Preferably, the propelling auxiliary roller is tapered such that its diameter decreases toward the main body.

  In this way, it is possible to move along the vertical wall surface without separation by the propulsion assist roller.

  Preferably, the main body is provided with an upwardly extending grip bar.

  In this way, the work can be performed without the worker taking an unreasonable posture.

  The present invention is located on the upper side when laying a waterproof sheet by wrapping a waterproof sheet at the corner between the vertical wall and floor of the roof of the building or at the corner between the vertical and vertical wall. In the work of cutting the end edge of the waterproof sheet with a blade to form the part to be wrapped, the lower end edge of the waterproof sheet to be positioned on the upper side is placed under the upper space or the upper side of the cutting edge portion of the blade. By positioning them relative to one another and forming a wrap portion on the edge of the tarpaulin that will be positioned on the upper side without damaging the tarpaulin that will be positioned on the lower side It can be cut to leave the constant width needed to do so. In addition, the guide is provided so as to be removable, and if the guide is removed, it becomes compact and convenient to carry.

It is a front view showing one embodiment of a lap joint cutter concerning the present invention. It is the same rear view. It is sectional drawing in the AA of FIG. It is a figure similar to FIG. 1 which shows another embodiment. It is the same rear view. It is sectional drawing in the BB line of FIG. It is a front view which shows another embodiment. It is the same rear view. It is sectional drawing in the CC line of FIG. It is a figure similar to FIG. 1 which shows other embodiment. It is the same rear view. It is sectional drawing in the DD line of FIG. It is explanatory drawing at the time of providing a grip stick. It is explanatory drawing at the time of providing another grip stick. It is explanatory drawing of the conventional construction method.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing an embodiment of a lap joint cutter according to the present invention, FIG. 2 is a back view thereof, and FIG. 3 is a cross-sectional view taken along line AA of FIG.

  Reference numeral 1 denotes a lap joint cutter, which has a round blade 2 as a cutter for cutting a waterproof sheet, and when laying a waterproof sheet on the roof of a building, the waterproof sheet 101 on the floor side and the waterproof on the vertical wall side In the work of forming a lap portion with the sheet 104, the lower end edge of the vertical wall side waterproof sheet 104 to be positioned on the upper side is cut so as to have a predetermined width (40 mm or more) required for the lap portion. Mainly used for This cutting is performed by the round blade 2 (blade).

  The lap joint cutter 1 has a vertically elongated plate-like main body 3. The main body 3 has a lower portion 3a and an upper portion 3b thicker than the lower portion 3a. The lower portion 3a is coupled to the lower side of the upper portion 3b and at the center in the thickness direction. Through this connection, a through hole 3c is formed between the two parts 3a and 3b, and by inserting a finger into the through hole 3c, the upper part 3b can be gripped firmly as a grip. . A round blade 2 is rotatably attached to a lower portion 3a which is a lower portion of the main body 3 and at a central position in the longitudinal direction of the main body. That is, at the upper part of the main body 3 which supports the round blade 2 (blade) at the lower part, a grip part (upper part 3b) for an operator to hold at the time of cutting is provided.

  A guide 4 is provided on one side of the main body 3 so as to protrude laterally. The guide 4 has an L-shaped cross section, and includes a vertical portion 4a attached to the main body 3 and a horizontal portion 4b projecting laterally from the lower edge of the vertical portion 4a. The horizontal portion 4b has a constant width, and can function as a ruler that enables cutting of a constant width in the above-described cutting operation. That is, the guide 4 has a projecting portion (horizontal portion 4b) of a constant width along the longitudinal direction of the main body 3 in order to secure the constant width required for the wrap portion. Since the guide 4 is removably attached to the main body 3, it can be removed for carrying, which is convenient for carrying. In addition, the attachment means of the guide 4 can utilize not only screwing but fitting etc., and it should just be a removable attachment means. Further, the cross-sectional shape of the guide is not limited to the L-shaped cross section, as long as it enables cutting with a constant width, for example, it may be U-shaped in cross section. Furthermore, the guide 4 may be divided into a plurality of pieces in the longitudinal direction so that storage becomes easy when carrying it.

  Below the main body 3, an underlay 5 is provided at a predetermined distance from the main body 3 to form two space portions S1 and S2 with the lower end edge of the main body 3 (lower side portion 3a). And, in the space portions S1 and S2, a part of the round blade 2 (cutting edge portion of the outer peripheral edge) is positioned to face the open side of the space portions S1 and S2, and any one of the space portions S1 and S2 For example, the edge of the waterproof sheet 104 on the side of the vertical wall can be inserted through the open side, and the edge of the waterproof sheet 104 on the side of the vertical wall can be cut by the round blade 2, for example. Thereby, if the edge of the waterproof sheet 104 is inserted through one of the open sides of the space portions S1 and S2 and the wrap joint cutter 1 is moved relative to the edge of the waterproof sheet 104, the waterproof sheet 104 can be obtained. Can be cut by the round blade 2.

  Further, a mounting plate 6 is provided on the main body 3 (lower portion 3a) at a substantially central position in the longitudinal direction of the main body so that a part (lower end) protrudes downward. Underlayment 5 is provided. Thus, the space portions S1 and S2 are formed between the main body 3 and the underlayment 5 on both sides of the mounting plate 6. Needless to say, the mounting plate 7 is attached to the main body 3 so as not to impair the rotation of the round blade 2.

The underlayment 5 has a pair of square bar-like underlaying elements 5a, 5a arranged parallel to form a gap. The underlaying elements 5a, 5a are disposed on both sides in the width direction of the mounting plate 7, and the cutting blade portion of the round blade 2 is located in the gap between one of the pair of underlaying elements 5a and the mounting plate 7.
A part of the round blade 2 is positioned in the gap between the underlaying elements 5a and 5a, and the waterproof sheet 104 is round only by relatively moving the edge of the waterproof sheet 104 in the space portions S1 and S2. It is cut by the blade 2. In addition, the lower surface (plane) of the underlaying elements 5a and 5a can also be processed so as to be slippery on the upper surface of the waterproof sheet 104.
A pair of pressing rollers 10A for pressing the waterproof sheet at the time of cutting so that the pressing of the waterproof sheet 104 at the time of cutting becomes reliable at one side of the main body 3 (the side at which the guide 4 is provided). , 10B are provided rotatably about the rotation axes 10Aa, 10Ba at intervals in the longitudinal direction of the main body. These pressing rollers 10A and 10B are provided with the guide 4 interposed therebetween. That is, the pressing rollers 10A and 10B are disposed on both sides of the guide 4. The rotary shafts 10Aa and 10Ba are not specifically illustrated, but are removably attached to the main body 3 by a known attachment means (for example, screwing and fitting). Therefore, after completion of the operation, the pressing rollers 10A and 10B can also be removed from the main body 3 together with the rotation shafts 10Aa and 10Ba, so that the advantage of portability is not impaired.

  And since the width of the guide 4 is appropriately changed and used in the range of 40 mm to 50 mm, it goes without saying that the lengths of the rotation shafts 10Aa and 10Ba of the pressing rollers 10A and 10B are also changed accordingly.

  In addition, on the other side of the side of the main body 3 (the side opposite to the side where the guide 4 is provided), at the time of cutting, the pair of main bodies 3 assists in going straight without swinging left and right. Propulsion auxiliary rollers 11A and 11B are provided rotatably around the rotation shafts 11Aa and 11Ba corresponding to the pressing rollers 10A and 10B. The rotary shafts 11Aa and 11Ba are also attached to the main body 3 so as to be removable by a known attachment means (for example, screwing and fitting), although not specifically shown.

  The propulsion assist rollers 11A and 11B are tapered such that the diameter decreases toward the main body 3 so that they can be moved along the vertical wall of the vertical wall portion 103 during cutting operation without separation . In addition, since the propulsion assist rollers 11A and 11B can be removed from the main body 3 together with the rotation shafts 11Aa and 11Ba, the advantage of portability is not impaired.

  Therefore, when performing a cutting operation using the lap joint cutter 1, the outer edge of the horizontal portion 4b of the guide 4 is pressed against the waterproof sheet 104 on the vertical wall surface side, for example, the waterproof sheet 104 on the vertical wall surface side in the space S1. The lower end edge of the vertical wall side waterproof sheet 104 is required for the wrap portion by inserting the lower end edge of the lower joint of the lap joint cutter 1 and sliding the lower sheet 5 of the lap joint cutter 1 on the floor side waterproof sheet 102 It can be cut to a width (40 mm or more).

  Since this cutting operation can be performed by the operator holding the grip 3a with one hand, the cutting operation is simplified. Further, at the time of this work, the press rollers 10A and 10B hold the waterproof sheet 104, and can be moved along the vertical wall portion 103 by the propulsion assist rollers 11A and 11B without moving away, so the lap joint cutter 1 is moved. The cutting can be performed smoothly and the workability is good.

  In addition, when carrying it after completion of the work, the guide 4 and the rollers 10A, 10B, 11A, 11B (including the rotating shafts 10Aa, 10Ba, 11Aa, 11Ba) can be removed from the main body 3 and disassembled. It is convenient to carry.

  Furthermore, since the round blade 2 is provided between the lower portion 3b located on the left and right and the mounting plate 6 and between the underlaying elements 5a and 5a, and is not exposed except for the spaces S1 and S2, Safety is secured.

  The present invention can be implemented with the following modifications in addition to the above.

  (i) Of course, a flat blade can be used instead of the round blade 2 as the blade. In that case, as in the case of the round blade, one or two flat blades (replacement blades) can be provided exchangeably on the main body so that they can be replaced when the sharpness decreases. In that case, as shown in FIGS. 4 to 6, two flat blades 2Aa and 2Ab (replacement blades of a folding blade-type cutter knife) are used, and their cutting blade portions 2Aaa and 2Aba are in the opposite direction, and both are outside If it is provided so as to be directed, as in the case of the round blade 2, it can be cut in any direction. This makes it possible for both right-handed and left-handed people to cut smoothly. If the sharpness of the cutting edge 2Aaa, 2Aba of the used tip (lower end) becomes worse, the cutting blade 2Aaa, 2Aba being used is broken away and the new cutting is continued as in the case of the known cutter knife. The blade portion can be made available. In this case, the left and right main body elements 3Aa and 3Ab are combined to form the main body 3A. Then, by combining the main body elements 3Aa and 3Ab, a pair of blade storage portions 3Ac and 3Ad in the form of a passage are formed between them, and flat blades 2Aa and 2Ab are provided slidably in the blade storage portions 3Ac and 3Ad. You should do it. Further, the flat blades 2Aa and 2Ab are pushed downward by the pins 8A and 8B engaged near the upper end portions of the flat blades 2Aa and 2Ab, and the flat blades 2Aa and 2Ab are provided below the cutter storage portions 3Ac and 3Ad in the longitudinal direction. If the cutting blade portions 2Aaa, 2Aba that need to be moved and replaced are broken and removed, the subsequent new cutting blade portions 2Aaa, 2Aba can be used. The pins 8A and 8B are movable along guide holes 9A and 9B extending along the longitudinal direction of the cutter storage portions 3Ac and 3Ad.

  Moreover, it is also possible to fit and utilize the whole of a commercially available folding blade-type cutter knife or a feeding-type knife of a replaceable blade type in the blade storage portion of the main body as it is.

  (ii) It is also possible to work without using the pressing rollers 10A and 10B and the propulsion auxiliary rollers 11A and 11B because of the restriction of the work place and the like. In that case, as shown in FIGS. 7-9, it is desirable to use a guide 4 'which extends to a portion where the rollers 10A, 10B, 11A, 11B are provided, in order to perform a stable operation. That is, the guide 4 is provided along the entire longitudinal direction of the main body 3. In addition, when the length of the main body is shortened, conversely, the guide can be omitted and the pressing rollers 10A and 10B can have a guide function.

  (iii) In the above-mentioned embodiment, although it is set as the structure which has an underlaying part, this invention is not limited to it, It is also possible to abbreviate | omit an underlaying part. In that case, the hook blade 2Ba, 2Bb in which only the hook inner portion is the cutting edge portion 2Baa, 2Bba is used as a blade, and the main portion of the hook is the upper side. Attached to In the case of such hook blades 2Ba and 2Bb, since the hook outer portion that hits the floor side waterproof sheet 102 is not a cutting edge portion, the waterproof sheet 102 is not damaged by the hook blades 2Ba and 2Bb. is there. Specifically, as in the case described above, one or two hook blades (replacement blades) can be provided exchangeably, and, similarly to the main body 3A shown in FIGS. As shown in FIG. 12, the left and right main body elements are combined, and the cutter storage portion 3Bc. The body 3B is formed such that 3Bd inclines and crosses, and the hook blades 2Ba and 2Bb are slid in the blade storage portions 3Bc and 3Bd by pins 8A and 8B moving along the long holes 9A and 9B. It can also be provided to be able to move as much as possible.

  In the structure shown in FIGS. 10 to 12, since the rollers 10A, 10B, 11A, 11B form the space S for relatively moving the lower end edge of the waterproof sheet 104 on the vertical wall side under the main body 3B. The cutting edge portions 2Baa and 2Bba of the tips of the hook blades 2Ba and 2Bb may be located in the space S. Also in this case, it is possible to cut in any direction, and it can be cut smoothly by right-handed and left-handed people. In the case where the rollers 10A, 10B, 11A, and 11B are not used, the same effect can be exhibited by providing the main body with a convex portion forming the space portion so as to project downward.

  In addition, it is possible to fit and use the whole of a commercially available folding blade-type cutter knife using a hook blade or a feeding-type knife of a replaceable blade type as it is. In that case, at the time of cutting, the cutting edge portion of the tip of the cutting blade (commercially available folding blade cutter knife or feeding blade of replacement blade system) can cut the edge of the waterproof sheet below the main body You need to make it stand out.

  (iv) As shown in FIG. 13 and FIG. 14, grip bars 12A and 12B extending upward may be detachably provided on the main body 3 so that the worker can work while standing. In that case, the lower end portions of the grip bars 12A and 12B can be easily removed by being attached to the main body by a known attachment means (for example, screwing and fitting). In addition, it is possible to adjust the length of the grip bars 12A and 12B according to the height of the worker using a known variable length structure such as a slide cylinder structure.

  (v) In the above embodiment, the waterproof sheet 101 or 104 is wrapped at a corner portion (corner portion) between the vertical wall surface and the floor surface of the roof of the building. It goes without saying that the invention can also be applied to the case where a waterproof sheet is wrapped at a corner portion (a corner portion between a vertical wall surface) in the vertical wall portion. In addition, as shown in FIG. 15, the waterproof sheet 104 on the floor surface 101 may be joined to the upward upper vertical wall surface of the vertical wall portion 103 (parapet) via the polyvinyl chloride steel plate 105. In that case, using the cutter shown in FIGS. 7 to 9, the upper edge of the waterproof sheet is pressed by moving the guide 4 thereof against the outer corner (PVC steel plate 105) on the upper side of the vertical wall. It is also possible to cut it into a length that is 10 mm inside from the outer surface of the vertical wall, and join it on the polyvinyl chloride steel plate without damaging the surface chloride vinyl layer of the polyvinyl chloride steel plate 105.

1 Lap joint cutter 2 Round blade (blade)
2Aa, 2Ab Flat blade 2Ba, 2Bb Hook blade 2Aaa, 2Aba, 2Baa, 2Bba Cutting blade portion 3, 3A, 3B Main body 3Ac, 3Ad, 3Bc. 3Bd Cutting tool storage portion 3a Lower portion 3b Upper portion 3c Through hole 4, 4 'Guide 4a Vertical portion 4b Horizontal portion 5 Underlaying element 5 Mounting element 7 Mounting plate 8A, 8B Pin 9A, 9B Guide hole 10A, 10B Holding roller 10Aa, 10Ba Rotary shafts 11A, 11B Propulsion auxiliary rollers 11Aa, 11Ba Rotary shafts 12A, 12B Grip bars S, S1, S2 Space part

Claims (10)

The edge of the tarpaulin that will be located on the upper side when wrapping the tarpaulin in the corner between the vertical wall and floor of the roof of the building or the corner between the vertical wall and the vertical A lap joint cutter used to cut an edge with a blade to make the width of the part to be wrapped constant.
A main body having a grip at an upper portion and supporting the blade;
A guide which is provided laterally releasably and laterally on the side of the body and which has a constant projecting width along the longitudinal direction of the body;
An underlayment provided below the main body and forming a space portion into which an edge of the waterproof sheet can be inserted, with the lower end of the main body;
The lap joint cutter characterized in that a cutting edge portion of the cutter is positioned in the space portion so as to be able to cut an edge of the waterproof sheet. The apparatus further comprises a mounting plate having an upper end attached to the main body and a lower end projecting downward of the main body,
The underlayment is attached to the lower end of the attachment plate,
The lap joint cutter according to claim 1, wherein the space portions are respectively formed on both sides in the longitudinal direction of the main body across the mounting plate. The underlayment has a pair of underlay elements arranged side by side in parallel,
The pair of underlaying elements are disposed on both sides in the width direction of the mounting plate, and a gap is formed between one of the pair of underlaying elements and the mounting plate in which the cutting blade portion of the cutter is located. The lap joint cutter according to claim 1 or 2.   The lap joint cutter according to any one of claims 1 to 3, wherein the cutter is a round blade rotatably provided on the main body and having an outer peripheral edge as a cutting edge portion.   The wrap according to any one of claims 1 to 3, wherein the cutter is a pair of flat blades, and the cutting blade portion of each flat blade is directed to the insertion side of the edge of the waterproof sheet. Joint cutter. When laying a waterproof sheet from the vertical wall surface of the roof of the building to the floor surface, the vertical wall side which is positioned on the upper side in the wrap portion of the waterproof sheet on the floor surface side and the waterproof sheet on the vertical wall surface side A lap joint cutter used to cut the edge of the tarpaulin with a blade to make the width of the wrap portion a constant width,
A main body having a grip at an upper portion and supporting the blade;
A guide which is provided laterally releasably on the side of the main body and is removably provided with a projecting portion of a fixed width along the longitudinal direction of the main body,
The cutting blade portion of the cutter is provided below the main body so as to be able to cut the edge of the waterproof sheet,
The lapping joint cutter is characterized in that a tip portion of the cutter is a hook shape and only a hook inner portion is the cutting blade portion.   The lap joint according to any one of claims 1 to 6, wherein a pair of pressing rollers for pressing the waterproof sheet at the time of cutting is rotatably provided on the side portion of the main body provided with the guide. cutter.   The lap joint cutter according to claim 7, wherein the pressing roller is provided to sandwich the guide. On the side opposite to the side of the body on which the guide is provided, a pair of propulsion assist rollers are rotatably provided to assist the propulsion when cutting;
The lap joint cutter according to any one of claims 1 to 8, wherein the propulsion assist roller is tapered such that the diameter decreases toward the main body side.   The lap joint cutter according to any one of claims 1 to 9, wherein the main body is provided with an upwardly extending grip bar.

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