JP2005145518A - Corner patch member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a corner patch member, which can be attached to a corner of an article stably and securely even if various types of accessories project from the surface of the article to be protected to form irregularities on the surface of the article within an area where the corner patch member is attached. <P>SOLUTION: The corner patch member 1 is attached to a corner of a panel, where header faces cross at right angles. The patch member 1 comprises two header support walls 10, 20, which cross at right angles and come in counter contact with the header faces, respectively, and a pair of parallel side walls 30, 30, which are formed between respective both side ends of the header support walls 10, 20, which cross at right angles, and come in counter contact with the front/back faces of the corner of the panel, respectively. The walls 10, 20, 30, 30 jointly form a corner housing space X for housing the corner of the panel. A hole 40, which prevents an interference between the patch member 1 and a panel accessory projecting outward from at least one surface of the corner of the panel, a recession 50, and grooves 60 for making openings when necessary are formed on the corresponding walls 10, 20, 30, respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a corner contact member that is attached to a corner portion of an article to protect the corner portion, and belongs to the technical field of article protection, packing, storage, and transportation.

  In general, fittings such as interior doors and table tops and furniture for indoor furniture are called cornering members in order to prevent them from being damaged or damaged by hitting the corners around them during storage or transportation. The protective member to be applied is attached to the corner portion, and is packed, stored, transported, etc. in that state. Conventionally, various improvements have been proposed for this type of square contact member.

  For example, Patent Document 1 discloses a corner contact member that is attached to a corner portion of a rectangular parallelepiped furniture, and the corner contact member has three walls that respectively contact three surfaces that form the corner portion of the furniture. Part. And when furniture is placed on the floor and stored, dowel feet are projected on the outer surface of the wall that will come into contact with the floor, and a ball head recess is recessed on the inner surface of all three walls. Yes.

  With such a configuration, a gap is created between the furniture and the floor by the dowel foot, so that a tool such as a bar can be inserted into the gap to facilitate the loading operation of the furniture. Further, by crushing the spherical head recess after the cornering member is mounted on the furniture, a vacuum suction action is obtained, and the cornering member can be prevented from falling off the furniture.

Japanese Utility Model Publication No. 1-128564

  Here, in the said prior art etc., the surface of the article | item which is a protection object is flat, Therefore Therefore, it is presupposed that the inner surface of the wall part of the square contact member which contacts it is also flat similarly. However, as is obvious from an example of a fitting such as an interior door, various metal fittings and accessories such as an operation pin for a barrier-free bottom-tight device, a door wheel, a ruler edge, etc. It may be attached so that it protrudes outward from the surface (small edge surface extending in the lateral direction), the left and right small edge surfaces (small edge surface extending in the vertical direction), or the front and back surfaces, etc. If it exists in the mounting range of the corner contact member, it becomes an obstacle and it becomes impossible to mount the corner contact member, or it becomes difficult to mount stably. As a result, for example, in the above prior art, the inner wall surface of the square contact member floats without being in close contact with the surface of the furniture, and even if the ball head recess is crushed, a sufficient vacuum adsorption action cannot be obtained. Become.

  The present invention is intended to cope with the above-described problems. Even if various accessories are projected from the surface of the article to be protected, unevenness and undulations are generated on the surface of the article within the mounting range of the cornering member. Even if it is, it makes it a subject to mount | wear a corner | angular part of articles | goods stably and reliably. Hereinafter, the present invention will be described in detail including other problems.

  That is, the invention according to claim 1 of the present application is a corner contact member attached to a corner portion where the facet surfaces of the panel material are orthogonal to each other, and the first and second parts are respectively orthogonal to each other and contact the both facet surfaces. 2 and a pair of parallel side wall portions that are provided between the side end portions orthogonal to each other on both sides of both of the fore edge receiving wall portions and respectively contact the front and back surfaces of the corner portion of the panel material. In addition, a corner portion accommodating space for accommodating a corner portion of the panel material is formed by each of the wall portions, and the panel material protrudes outward from at least one surface of both the small edge surface and the front and back surfaces of the corner portion of the panel material. In order to avoid interference with the accessory, the corresponding wall portion is provided with interference avoiding means.

  Next, the invention according to claim 2 is the corner contact member according to claim 1, wherein the panel material is a door member, and the panel material accessory is provided from a small edge surface in the vertical direction of the corner portion of the door member. The pin is a bottom tight operating pin that protrudes, and the interference avoiding means is a hole portion that is opened corresponding to the protruding position of the pin in the small edge receiving wall portion that contacts the small edge surface and allows the pin to pass therethrough. And

  Next, the invention according to claim 3 is the corner contact member according to claim 1, wherein the panel material is a door member, and the panel material accessory is provided from a lateral edge of the door member corner. The interference avoiding means is a concave portion that is extended in the small edge receiving wall portion in contact with the small edge surface in correspondence with the protruding position of the door wheel and accommodates the door wheel.

  According to a fourth aspect of the present invention, in the square contact member according to the first aspect, the panel material is a door member, and the panel material accessory is a ruler protruding from the front surface or the back surface of the door member corner portion. The interference avoiding means is a groove portion that is formed corresponding to the protruding position of the ruler edge on the side wall portion that is in contact with the front surface or the back surface, and creates a groove as needed to allow the ruler edge to escape to the outside. It is characterized by being.

  According to the first aspect of the present invention, even if the panel material accessory protrudes outward from the top, bottom, left and right fore edges, front and back surfaces, etc., at the corners of the panel material to be protected, Measures to avoid interference with the article are taken for the cornering member, so when this cornering member is attached to the corner of the panel material, each wall does not float from each side of the panel material Adhering well, it is always possible to stably and reliably attach this corner contact member to the corner of the panel material.

  Next, according to the second aspect of the present invention, when the square contact member according to the present invention is used for protection of the door member, the bottom tight from the left and right small edge surfaces (the small edge surface extending in the vertical direction) of the door member. Even if the operation pin protrudes, the pin passes through the hole formed in the corresponding small edge receiving wall, so that the corner contact member can be attached to the door member while reliably avoiding interference with the pin. It can be attached to the corner stably and securely.

  Next, according to the third aspect of the present invention, similarly, when the square contact member according to the present invention is used for protecting the door member, the upper and lower edge surfaces (the edge surface extending in the lateral direction) of the door member. Even if the door wheel protrudes from the door, the door wheel is accommodated in the recess extending to the corresponding small edge receiving wall, so that the cornering member can be used as the door member while reliably avoiding interference with the door wheel. It can be securely and securely attached to the corners.

  According to the invention described in claim 4, similarly, when the square contact member according to the present invention is used for protecting the door member, even if the ruler edge protrudes from the front surface or the back surface of the door member, A ruler edge is an opening formed in a corresponding side wall (this opening is created as necessary by removing a part or all of the side wall along a groove provided in the corresponding side wall. Therefore, the corner contact member can be stably and reliably attached to the corner portion of the door member while reliably avoiding interference with the ruler edge.

  In the present invention, the material of the square contact member is not particularly limited. However, for example, when the side wall portion is removed along the groove portion, it can be easily cut manually by using a cutter or a hand. It is preferable to select the material. Examples of such materials include various resins that are soft and have high flexibility and plastic deformation such as polyethylene resin (PE), polyethylene terephthalate resin (PET), and polypropylene resin (PP). . Hereinafter, the present invention will be described in more detail through embodiments.

  In the present embodiment, the present invention is applied to the square contact member 1 shown in FIG. The square contact member 1 is located on both sides of the vertical wall portion (small edge receiving wall portion) 10 extending in the vertical direction, the horizontal wall portion (small edge receiving wall portion) 20 extending in the horizontal direction, and these two wall portions 10 and 20. The left and right side wall portions 30, 30 extending in the vertical direction have a pair of left and right side wall portions 30, 30, and a corner portion accommodation space X is defined by these four wall portions 10, 20, 30, 30.

  As shown in FIG. 2, the corner contact member 1 is attached to, for example, the corners of the four corners of the interior door 100 to be protected. In this case, the vertical wall portion (small edge receiving wall portion) 10 of the corner contact member 1 is in contact with the left and right small edge surfaces (small edge surfaces extending in the vertical direction) 101 among the surfaces orthogonal to each other at the corner portion of the interior door 100. The horizontal wall portion (small edge receiving wall portion) 20 is in contact with the upper and lower small edge surfaces (small edge surface extending in the horizontal direction) 102, and the side wall portion 30 is in contact with the front surface or the back surface 103. When mounting the corner contact member 1 to the corner portion of the interior door 100, the corner contact member 1 is moved relative to the interior door 100 as indicated by the arrow A to accommodate the corner portion of the interior door 100. Enter the space X. On the contrary, when the corner contact member 1 is removed from the corner portion of the interior door 100, the corner contact member 1 is relatively moved as indicated by the arrow B, and the corner portion of the interior door 100 is detached from the housing space X.

  The corner contact member 1 has an inner width dimension (distance between the inner surfaces of the side wall portions 30, 30) slightly smaller than the width dimension of the interior door 100. Due to the elastic restoring force of the material of the abutting member 1, the side wall portions 30, 30 are pressed so as to sandwich the front and back surfaces 103, 103 of the interior door 100, and the corner abutting member 1 is securely attached to the corner of the interior door 100. Lock to.

  Returning to FIG. 1, the vertical wall portion 10 is formed of a rectangular single wall, and the horizontal wall portion 20 is sandwiched between a single wall 21 having a narrower width than the single wall 21. The side wall portions 30 and 30 are formed of a single wall having a substantially triangular shape but having five sides.

  Here, the lower end portion of the vertical wall portion 10 and the rear end portion of the single wall 21 of the horizontal wall portion 20 intersect at 90 ° and are continuous. Further, the left and right end portions of the single wall 21 of the lateral wall portion 20 and the lower surfaces of the quadrangular prism elements 22 and 22 are continuous with each other. Further, the rear end portions of the quadrangular column elements 22, 22 of the horizontal wall portion 20 abut against the lower portion of the vertical wall portion 10 and are continuous. On the other hand, the rear end portions of the side wall portions 30 and 30 and the left and right end portions of the vertical wall portion 10 are continuous at 90 °. And the lower end part of the side wall parts 30 and 30 and the outer side vertical surface of the quadratic prism elements 22 and 22 of the horizontal wall part 20 are continuing on the same plane. Here, since the horizontal wall portion 20 includes not only the single wall 21 but also the quadrangular prism elements 22 and 22 having a hollow structure, an effective impact interference action is exhibited.

  As shown in FIG. 3, a circular hole 40 is formed in the vertical wall portion 10, and a concave portion (step) 50 extending in the length direction of the upper and lower fore edge surfaces 102 is formed in the horizontal wall portion 20 (this concave portion). 50 is constituted by a single wall 21 and inner vertical surfaces of the quadrangular prism elements 22 and 22 on both sides thereof, and side wall portions 30 and 30 are formed with groove portions 60 and 60 having a V-shaped cross section. Yes. These correspond to the “interference avoiding means” in the claims and each function as follows.

  First, as shown in FIG. 4, for example, the hole 40 can be used to insert a bottom tight actuating pin 110 that protrudes laterally at a relatively lower portion of the left and right small facets 101 of the interior door 100. . Therefore, the diameter of the hole 40 is set to be substantially the same as the diameter of the pin 110, and the opening position of the hole 40 is set when the cornering member 1 is attached to the corner where the pin 110 is disposed. The position in the width direction substantially the same as that of the pin 110 and the position in the up-down direction are set.

  In addition, bottom tight, as is well known, especially in barrier-free homes, etc., when the floor is made as smooth as possible, resulting in a gap between the floor edge on the lower side of the interior door and the floor. In addition, a shield for closing the gap is provided on the lower face of the interior door and the like, so that it is possible to prevent the intrusion of clearance air and sound from the lower part of the door, light leakage, and the like. In particular, the operating pin 110 illustrated in FIG. 4 has the pin 110 pushed by the door frame and pushed into the door 100 when the door 100 is closed in the house, and in conjunction therewith. A shielding plate (not shown) descends from the lower facet 102 of the door 100 and closes the gap between the floor.

  As a result, as shown in an enlarged view in FIG. 5, even if a door accessory such as the bottom tight operation pin 110 protrudes from the left and right small facets 101 of the interior door 100 to be protected, the accessory 110 Is inserted through the hole 40 formed in the corresponding vertical wall portion 10, so that the corner contact member 1 is always placed at the corner of the interior door 100 while reliably avoiding interference with the accessory 110. For example, the vertical wall portion 10 of the corner contact member 1 does not float from the left and right small edge surfaces 101 of the interior door 100, and is in good contact with each other.

  Next, for example, as shown in FIG. 6, the recess 50 can be used to accommodate a door wheel 120 that protrudes upward and downward at a relatively end portion of the upper and lower edge surfaces 102 of the interior door 100. Therefore, the width of the concave portion 50 is set to be substantially the same as the width of the door wheel 120, and the extended position of the concave portion 50 is set when the cornering member 1 is mounted on the corner portion where the door wheel 120 is disposed. It is set at a position in the width direction substantially the same as the door wheel 120.

  As a result, as shown in an enlarged view in FIG. 7, even if a door accessory such as the door wheel 120 protrudes from the upper and lower edge surfaces 102 of the interior door 100 to be protected, the accessory 120 corresponds. Since it is accommodated in the recessed part 50 extended in the horizontal wall part 20, by this, this corner contact member 1 is always stably and reliably attached to the corner | angular part of the interior door 100, avoiding interference with the said accessory 120 reliably. For example, the horizontal wall portion 20 of the corner contact member 1 does not float from the upper and lower edge surfaces 102 of the interior door 100 and is in good contact. At this time, more specifically, the upper and lower small facets 102 of the interior door 100 are in contact with the upper surfaces of the quadrangular prism elements 22 and 22 in the lateral wall portion 20.

  Next, for example, as shown in FIG. 8, the groove 60 creates an opening for escaping the ruler edge 130 protruding to the front and back sides at the left and right edges of the interior door 100 or the back surface 103 as needed. Can be used to Therefore, the groove portion 60 is recessed so as to run in substantially the same shape as the contour of the ruler edge 130 when the cornering member 1 is attached to the corner portion where the ruler edge 130 is disposed. Therefore, by removing a part or all of the side wall portion 30 along the groove portion 60, an opening 60 a having substantially the same shape as the contour of the ruler edge 130 is formed on the side portion of the square contact member 1.

  As a result, as shown in an enlarged view in FIG. 9, even if a door accessory such as the ruler edge 130 protrudes from the front or back surface 103 of the interior door 100 to be protected, the accessory 130 corresponds. Since the opening 60a formed in the side wall portion 30 is escaped to the outside, the corner contact member 1 is always stably and reliably attached to the corner portion of the interior door 100 while reliably avoiding interference with the accessory 130. For example, the side wall portion 30 of the square contact member 1 does not float from the front surface or the back surface 103 of the interior door 100 and is in good contact.

  In this case, the ruler edge 130 protrudes not only on the front side and the back side of the interior door 100 but also on the left and right sides. Therefore, the opening 60a formed by the groove 60 has the ruler edge 130 on the front side and the back side. Not only the back side but also the left and right sides will escape.

  Further, in this case, since the pressing force by the pair of side wall portions 30 and 30 cannot be obtained by removing one of the side wall portions 30, after the cornering member 1 is mounted on the interior door 100, for example, an adhesive tape or the like The corner contact member 1 is securely locked to the corner portion of the interior door 100 using the appropriate locking means. However, such an emergency treatment is required only when one of the side wall portions 30 is removed as necessary, and usually a pressing force by the side wall portions 30 and 30 can be obtained. First aid is not necessary.

  Further, considering that the side wall portion 30 is removed along the groove portion 60 (more specifically, the bottom portion of the groove portion 60), the material of the square contact member 1 is a human hand using a cutter or a hand. It is preferable to select a material that can be easily cut by this, and from this viewpoint, in this embodiment, polyethylene resin (PE), polyethylene terephthalate resin (PET), polypropylene resin (PP), etc. are soft, The square contact member 1 is produced as an integral body by, for example, blow molding various resins having high flexibility and plastic deformability.

  The embodiment described above is the best mode for carrying out the present invention, but it goes without saying that various modifications and omissions can be made without departing from the spirit of the present invention. For example, the shape, size, number, opening position, and the like of the hole 40 of the vertical wall 10 shown in FIG. 5 can be variously changed according to the accessory to be inserted. Further, as illustrated in FIG. 10, instead of the hole portion 40, a recess 70 that extends vertically is provided in the vertical wall portion 10, and the vertical recess 70 projects from the left and right small facets 101 such as bottom tight operation pins. You may make it accommodate an accessory.

  On the other hand, the shape, size, number, extension position, and the like of the concave portion 50 of the horizontal wall portion 20 shown in FIG. For example, as shown in FIG. 11 (a), two horizontal walls 21 and 21 are arranged on both sides with one quadrangular prism element 22 interposed therebetween, and two concave portions 50 and 50 are formed at a predetermined interval. You may make it do. This can be preferably used for, for example, an object to be protected in which two door carts are arranged side by side in the width direction. Further, as shown in FIG. 11B, one recess 50 may be formed so as to be biased in the width direction. This can be preferably used for, for example, an object to be protected in which the door cart is attached with a bias in the width direction. Furthermore, as shown in FIG. 11 (c), instead of the quadrangular prism element 22, an L-shaped surface 22 a composed only of the inner vertical surface and the upper surface of the quadrangular prism element continuous with the single wall 21 and the side wall 30 is employed. It is also possible to do. If it does in this way, the weight reduction of the square contact member 1 can be achieved.

  On the other hand, the groove 60 or opening 60a of the side wall 30 shown enlarged in the circle of FIG. 3 also removes all of the shape, size, number, forming position, and side wall 30 according to the accessory to be released to the outside. It is possible to variously change whether or not only a part is removed. As shown in an enlarged view in FIG. 3, the V-shaped groove 60 is formed so that the lower end portion of the opening 60 a (see FIG. 9) after removing the side wall portion 30 is flush with the upper surface of the quadrangular prism element 22. The bottom portion has the same height as the top surface of the quadrangular prism element 22 (in the enlarged circle, one specific example of the cutting line when removing the side wall portion 30 is shown by a broken line). 3 exemplifies a case where the groove portion 60 is entirely located above the upper surface of the quadrangular prism element 22, instead of this, as shown in FIG. May be disposed below the upper surface of the quadrangular prism element 22 as a whole, and as shown in FIG. 12B, the groove portion 60 is disposed across the upper and lower surfaces of the quadrangular prism element 22. May be. Furthermore, as shown in FIG. 12C, the groove portion 60 can be disposed on the inner surface of the side wall portion 30.

  Further, in the embodiment described above, the protection target object 100 has the accessory that should avoid interference on only one of the surfaces 101, 102, 103, and 103 that form the corners. However, the present invention is not limited to this, and the protection target object 100 may include accessory items on two or more surfaces. For example, the protection target object 100 may include a bottom tight actuation pin 110 having a small edge surface 101 in the vertical direction and a door wheel 120 having a small edge surface 102 in the horizontal direction at the same time.

  In this case, the square contact member 1 is provided with two or more interference avoiding means of the hole portion 40, the concave portion 50, and the groove portion 60 in the adjacent different wall portions. When a plurality of interference avoiding means having different directions are used in combination with one square contact member 1, at least one of the interference avoiding means may be a recess extending in the length direction. When the corner contact member 1 is attached to the protection target object 100, the relative movement between the corner contact member 1 and the protection target object 100 is not hindered by the accessory protruding outward, and a preferable result is obtained. Because.

  Conversely, as in the embodiment described above, when the object to be protected 100 has the accessory only on one surface, the cornering member 1 has the hole 40, the recess 50, and the groove 60. Of these, only one interference avoiding means corresponding to the accessory need be provided.

  And in the said embodiment, the recessed part 50 of the horizontal wall part 20 can function also as an object for interference avoidance with the shielding board of a bottom tight apparatus. That is, as described above, in the above-described embodiment, when the bottom tight operation pin 110 provided on the small edge surface 101 in the vertical direction of the door 100 is pushed into the door 100, the shielding plate is interlocked with the door. 100, since the pin 110 is pushed unexpectedly after the cornering member 1 is mounted and the shielding plate protrudes from the lateral fore edge 102, The shielding plate is accommodated in the recess 50, and as a result, the interference between the shielding plate and the lateral wall portion 20 is avoided, and there is no inconvenience that the cornering member 1 falls off the door 100.

  Further, as shown in FIG. 13, for example, the side wall portions 30, 30 of the square contact member 1 are cut in a U-shape, and the resulting pieces 80, 80 are erected inward so that the tip portion is You may make it protrude a little in the corner | angular part accommodation space X. FIG. The cut-and-raised pieces 80, 80 are pressing pieces that are pressed so as to sandwich the front and back surfaces 103, 103 of the interior door 100 even when the width dimension of the interior door 100 entering the corner housing space X is unexpectedly small. As a result, when the cornering member 1 is mounted on the interior door 100, the cornering member 1 is reliably prevented from falling off the corner of the interior door 100 that is to be protected.

  As described above in detail with reference to specific examples, in the present invention, various accessory articles protrude from the surface of the article to be protected, and irregularities and undulations are generated on the surface of the article within the mounting range of the square contact member. Even in this case, the corner contact member can be attached to the corner of the article stably and reliably. The present invention is in the technical field of protection, packing, storage, and transportation of various articles, including interior products such as interior furniture such as interior doors and hanging doors, or interior furniture such as cabinets and table tops. Has wide industrial applicability.

It is a perspective view of the square contact member which concerns on embodiment of this invention. It is a front view of the interior door which mounted | wore the corner part of four corners with the said square contact member. It is a front view toward the vertical wall part of the said square contact member, and shows the structure of a V-shaped ditch | groove in an enlarged circle. It is a perspective view of the interior door from which the pin for bottom tight operation protrudes sideways from the comparatively lower part of the left and right small edge surfaces. It is an expansion perspective view which shows the effect | action of the hole provided in the vertical wall part of a square contact member. It is a perspective view of the interior door from which the doorwheel protrudes up and down from the comparatively edge part of an up-and-down small end surface. It is the expansion perspective view which shows the effect | action of the recessed part provided in the horizontal wall part of the square contact member, and the facing figure similar to FIG. It is a perspective view of the interior door from which a ruler edge protrudes in the front side and the back side from the right-and-left edge part of the surface or the back. It is the expansion perspective view and partial top view which show the effect | action of the groove part and opening which were provided in the side wall part of the square contact member. It is a perspective view similar to FIG. 5 which shows the square contact member which concerns on other embodiment of this invention. FIG. 4 is a front-facing view similar to the lower part of FIG. 3, showing some modifications of the recesses. It is a partial enlarged view similar to the inside of the enlarged circle of FIG. 3 which shows some modifications of a groove part. It is a front view similar to FIG. 3 which shows the square contact member which concerns on other embodiment of this invention.

Explanation of symbols

1 Square contact member 10 Vertical wall (small wall receiving wall)
20 Horizontal wall (small wall receiving wall)
30 side wall 40 hole (interference avoidance means)
50 recess (interference avoidance means)
60 Side wall removal groove (interference avoidance means)
DESCRIPTION OF SYMBOLS 100 Interior door 101 Left and right small edge surface 102 Upper and lower small edge surface 103 Front surface, back surface 110,120,130 Accessory X Corner part accommodation space

Claims (4)

  First and second fore edge receiving wall portions which are attached to corner portions where the fore edge surfaces of the panel material are orthogonal to each other, and are orthogonal to each other and respectively contact the fore edge surfaces, and both fore edge receiving wall portions. A pair of parallel side walls that are in contact with the front and back surfaces of the corner of the panel material, and each corner of the panel material is accommodated by the wall. A corner accommodating space is formed, and corresponding to avoid interference with the panel material accessory projecting outward from at least one surface of both corner surfaces and front and back surfaces of the corner portion of the panel material. An angular contact member characterized in that interference avoiding means is provided on the wall.   The panel material is a door member, the panel material accessory is a bottom tight actuation pin protruding from the small edge surface in the vertical direction of the door member corner, and the interference avoiding means is a small edge receiving wall that contacts the small edge surface. The square contact member according to claim 1, wherein the square contact member is a hole that is formed in a portion corresponding to a protruding position of the pin and allows the pin to pass therethrough.   The panel material is a door member, the panel material accessory is a door wheel protruding from a small edge surface in the lateral direction of the door member corner, and the interference avoiding means is provided on the edge wall of the small edge receiving wall that is in contact with the small edge surface. The angular contact member according to claim 1, wherein the angular contact member is a recess that extends corresponding to the protruding position of the housing and accommodates the door wheel. The panel material is a door member, the panel material accessory is a ruler edge protruding from the front surface or the back surface of the door member corner, and the interference avoiding means is provided on the side wall portion contacting the front surface or the back surface. The square contact member according to claim 1, wherein the square contact member is a groove portion that is formed corresponding to the protruding position and creates an opening as needed to allow the ruler edge to escape to the outside.

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