JP2012154090A - Strike structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strike structure having an excellent slidability of a lock bolt, with sufficient fire resistance.SOLUTION: A structure of a strike 1 which restricts opening of a door 9 with insertion of a lock bolt 45 projecting from a butt end 10 of a door 9 comprises a metal guide frame 5 which forms an insertion space 24 for the lock bolt 45, and a resin guide 6 which is attached to a peripheral wall 28 of the guide frame 5 and projects inward from the inner face of the peripheral wall 28.

Description

  The present invention relates to a strike structure used for a door structure of a building such as an apartment or a hotel.

  Conventionally, in a door structure of a building such as a condominium or a hotel, a lock bolt such as a dead bolt is provided in a door mouth so that the lock bolt can be projected and retracted, and a strike having a space for inserting the lock bolt is opposed to the door mouth. Provided in the opening frame of the. Then, the lock bolt can be locked and unlocked by allowing the lock bolt to protrude from the mouth of the door and inserting / removing the lock bolt with respect to the insertion space of the strike.

  In the strike used in the door structure as described above, if the member that forms the lock bolt insertion space is made of metal, the lock bolt is in sliding contact with the metal member, and the slidability of the lock bolt is deteriorated. However, there is a possibility that the lock bolt cannot be smoothly inserted into and removed from the insertion space. Therefore, a configuration in which a member that forms the insertion space for the lock bolt is formed of a resin material is generally used (see, for example, “adjustment block 29” in Patent Document 1).

JP 2010-24767 A

  However, if the entire member forming the lock bolt insertion space is made of resin as in the prior art, for example, when a fire occurs inside the building, it is ignited from the resin part by flame heat. Therefore, it has been difficult to ensure sufficient fire resistance of the strike.

  In view of the above-described circumstances, an object of the present invention is to provide a strike structure that can ensure fire resistance while maintaining good slidability of the lock bolt.

  The present invention relates to a strike structure in which a lock bolt protruding from a door end of a door is inserted to restrict opening of the door, and a metal guide frame that forms an insertion space for the lock bolt, and the guide frame And a resin guide that protrudes inward from the inner surface of the peripheral wall.

  The guide frame is housed in a box-shaped troyoke, and the peripheral wall is provided with a pair of side walls facing each other along the inner side surface of the troyoke. A contact wall may be provided on the inner side of the inner surface, and the guide may be detachably provided between the contact wall and the trolley.

  Further, the peripheral wall is provided with a pair of side walls facing each other, each of the side walls is provided with a notch along the opening end of the insertion space, and the guide can be fitted into and removed from the notch. It may be provided.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the structure of the strike which can ensure fire resistance, maintaining the slidability of a lock bolt favorable.

It is a sectional side view which shows the structure of the strike which concerns on 1st Embodiment. In the strike structure according to the first embodiment, (a) is a front view of a guide frame, and (b) is a side view thereof. It is AA sectional drawing of FIG. In the structure of the strike according to the first embodiment, (a) is a side view of one guide as viewed from the inside of the insertion space, and (b) is a front view of the one guide. In the structure of the strike according to the first embodiment, (a) is a side view of the other guide as viewed from the inside of the insertion space, and (b) is a front view of the other guide. It is a sectional side view which shows the structure of the strike which concerns on 2nd Embodiment. In the structure of the strike concerning a 2nd embodiment, (a) is a front view of a guide frame, and (b) is a CC sectional view of (a). It is BB sectional drawing of FIG. In the structure of the strike concerning a 2nd embodiment, (a) is a side view which looked at one guide from the inside of insertion space, and (b) is a front view of one guide. In the structure of the strike according to the second embodiment, (a) is a side view of the other guide as viewed from the inside of the insertion space, and (b) is a front view of the other guide.

  Hereinafter, preferred embodiments of the strike structure according to the present invention will be described with reference to the drawings.

<First Embodiment>
First, the first embodiment will be described with reference to FIGS. The case where the right side in FIG. 1 is the front side (front side) of each member will be described below.

  As shown in FIG. 1, the strike 1 includes a troyoke 2 having a bottomed box shape with an opening on the front side, a strike plate 3 provided so as to close the opening of the troyoke 2, and an upper end of the troyoke 2. 1 and a pair of guides 6 and 7 attached to the peripheral wall 28 of the guide frame 5 (one guide in FIG. 1). 6 is displayed).

  The troyoke 2 has a shape that is long in the vertical direction, and is embedded in the door frame 8 of a building such as a condominium or a hotel so as to be opposed to the mouth 10 of the door 9. Fixing rods 11 are provided at both upper and lower ends of the trowel 2, and fitting holes 12 are formed in the fixing rod 11 in the horizontal direction. Four insertion holes 13 are formed in the horizontal direction in the upper and lower portions of the bottom surface of the troyoke 2 on the upper and lower sides of the left and right sides. A pair of upper and lower positioning projections 15 are provided at the center of the bottom surface of the troyoke 2 in the vertical direction.

  The strike plate 3 has a flat plate shape that is long in the vertical direction. Screw holes 16 are drilled in the horizontal direction at both upper and lower ends of the strike plate 3. The strike plate 3 around the screw hole 16 is bent rearward and fitted into the fitting hole 12 of the troyoke 2. The trowel 2 and the strike plate 3 are configured to be fixed to the door frame 8 of the building by screws (not shown) inserted through the screw holes 16. A strike hole 17 is formed in the horizontal direction in the center of the strike plate 3 in the vertical direction.

  The magnet 4 has a rectangular parallelepiped shape, and its rear surface is supported by a yoke 18 having a U-shaped cross section. The magnet 4 and the yoke 18 are covered with a magnet cover 22. The magnet cover 22 has a U-shaped cross section with the back side opened. Engagement pieces 23 are provided at the upper, lower, left and right corners of the opening edge of the magnet cover 22, and the engagement pieces 23 are inserted through the insertion holes 13 provided on the bottom surface of the troyoke 2 and toward the inside. It is bent.

  The guide frame 5 is made of a stainless steel material such as SUS304 and is made of metal. As shown in FIGS. 2A and 2B, the guide frame 5 has a bottomed box shape with the front side opened, and forms an insertion space 24 having a substantially rectangular parallelepiped shape. The bottom wall 25 of the guide frame 5 has a vertically long rectangular through hole 26 extending in the horizontal direction from the top to the bottom, and positioning holes 27 are formed in the horizontal direction above and below the through hole 26. Yes. Then, the positioning protrusions 15 of the troyoke 2 are fitted into the positioning holes 27 of the guide frame 5 and the troyoke 2 and the bottom wall 25 of the guide frame 5 are joined by projection welding at both sides of each positioning hole 27. A guide frame 5 is fixed in the trowel 2 (see FIG. 1).

  A pair of side walls 29 facing each other are provided on the peripheral wall 28 of the guide frame 5 along the inner side surface 30 of the troyoke 2 (see FIGS. 1 and 3). On the front edge portions of the pair of side walls 29, a recessed engagement portion 32 is provided from the upper part to the lower part.

  On both the upper and lower sides of the pair of side walls 29, contact walls 34 are provided in parallel with the side walls 29 via gaps 33. Each abutment wall 34 is disposed on the inner side of the inner surface of each side wall 29, and the upper end of the upper abutment wall 34 is close to or in contact with the left and right ends of the upper end wall 35 of the guide frame 5. The lower end of the contact wall 34 is close to or in contact with the left and right ends of the lower end wall 36 of the guide frame 5. The protruding height of each contact wall 34 from the bottom wall 25 is adjusted to be higher than the protruding height of each side wall 29 from the bottom wall 25.

  The pair of guides 6 and 7 is made of a synthetic resin such as POM, for example, and has a flat plate shape that is long in the vertical direction. The pair of guides 6 and 7 are formed with the same length. As shown in FIGS. 4 and 5, recesses 37 are provided at the upper and lower ends of the inner surfaces of the guides 6 and 7. The recess 37 has an abutting surface 38 provided in the vertical direction and a slide restricting surface 40 provided in the horizontal direction, and has an L shape. As shown in FIG. 2A, the outer surfaces of the guides 6 and 7 are brought into contact with the inner surface 30 of the troyoke 2 and the contact surface 38 of the concave portion 37 is made to be the outer surface of the contact wall 34 of the guide frame 5. The guides 6 and 7 are removably inserted between the contact wall 34 and the trowel 2 so as to be in contact with each other. When the guides 6 and 7 are inserted between the trowel 2 and the contact wall 34 in this way, the guides 6 and 7 are configured to protrude inward from the inner surface of each side wall 29. Further, when the guides 6 and 7 are inserted between the trolley 2 and the abutment wall 34 in this way, the slide regulating surface 40 is locked by the abutment walls 34, and the guides 6 and 7 are moved in the vertical direction. The slide is configured to be regulated.

  As shown in FIGS. 4 and 5, the rear edge portions of the guides 6 and 7 are each provided with a protruding engaging portion 41 that is slightly shorter than the engaged portion 32 of the guide frame 5. When the guides 6 and 7 are inserted between the trowel 2 and the abutting wall 34 as described above, the engaging portion 41 and the engaged portion 32 are engaged, and the guides 6 and 7 are moved in the front-rear direction. The positioning is performed (see FIG. 1). A protruding piece 42 is provided at the front edge of each guide 6, 7, and this protruding piece 42 is disposed inside the strike hole 17 of the strike plate 3 (see the same figure). An inclined surface 39 is provided on the inner portion of the front end portion of the projecting piece 42.

  On the outer surface of one guide 6, six square-shaped hollow portions 43 having four rounded corners from the upper part to the lower part are recessed at regular intervals. The lightening portions 43 at the upper and lower ends are formed smaller than the four lightening portions 43 provided at the center in the vertical direction. On the outer surface of the other guide 7, square-shaped hollow portions 43 having R-shaped corners are provided at both upper and lower ends. A thin portion 44 is provided on the inner surface of the other guide 7 from the upper part to the lower part, and the thickness of the other guide 7 is smaller than the thickness of the one guide 6.

  In addition, a dead bolt 45 as a lock bolt is provided at a position facing the strike 1 having the above-described structure in the mouth 10 of the door 9. The dead bolt 45 is connected to a thumb turn and a cylinder lock (both not shown) provided on the door 9, and the dead bolt 45 is connected to the top of the door 9 by a thumb turn rotation operation or a cylinder lock rotation operation by a combined key. 10 is configured to appear and disappear. The dead bolt 45 is connected to an actuator of the electric lock system, and is configured such that the dead bolt 45 protrudes and emerges from the top 10 of the door 9 by driving the actuator by an electric signal.

  A door lock mechanism (not shown) is provided in the door 9 at a position corresponding to the magnet 4. As the door lock mechanism, either a mechanical lock method or an electric lock method is selectively used.

  In the case of the mechanical lock system, for example, a door includes a trigger body provided with a magnet at a position facing the magnet 4, and a locking lever having one end connected to the trigger body and the other end connected to the dead bolt 45. A locking mechanism is configured. Then, the trigger body is rotated by the magnetic repulsive force between the magnet 4 generated by closing the door 9 and the magnet described above, and the connection between the trigger body and the locking lever is released accordingly, and the dead bolt 45 is connected to the door 9. It is configured to protrude from the mouthpiece 10.

  In the case of the electrical lock system, for example, a door lock mechanism is constituted by a reed switch provided at a position facing the magnet 4, a motor connected to the reed switch, and an advance / retreat mechanism that connects the motor and the dead bolt 45. Composed. When the door 9 is closed, the reed switch and the magnet 4 are brought close to each other so that the reed switch is turned on, whereby the motor can be energized, and the dead bolt 45 is driven through the advancing / retracting mechanism by driving the motor. 9. It is comprised so that it may protrude from the mouthpiece 10 of nine.

  In the configuration as described above, the dead bolt 45 is attached to the door 9 by the rotation operation of the thumb turn provided on the door 9, the rotation operation of the cylinder lock by the combined key, the driving of the actuator of the electric lock system or the operation of the door lock mechanism. When projecting from the mouthpiece 10, the dead bolt 45 is inserted from the strike hole 17 of the strike plate 3 into the insertion space 24 of the guide frame 5 from the front side, and the opening of the door 9 is restricted (the door 9 is restricted). Locked). In addition, when the dead bolt 45 is inserted into the insertion space 24 in this way and the dead bolt 45 is retracted to the side of the door 10 of the door 9, the dead bolt 45 is detached from the insertion space 24 along with this, and the door 9 can be opened (the door 9 is unlocked).

  As described above, when the dead bolt 45 is inserted into and removed from the insertion space 24 of the guide frame 5, the dead bolt 45 normally does not contact the guides 6 and 7. On the other hand, when a large lateral pressure is applied to the dead bolt 45, for example, when the unlocking operation is performed while pushing the door 9, each resin guide protruding inward from the inner surface of the side wall 29 of the guide frame 5 is used. Dead bolts 45 are in sliding contact with 6 and 7. As described above, since the member with which the dead bolt 45 is slidably contacted is made of resin, the slidability of the deadbolt 45 can be maintained better than when the deadbolt 45 is slidably contacted with the metal member. Thus, the insertion / removal of the dead bolt 45 with respect to the insertion space 24 can be performed smoothly.

  In addition, since the guide frame 5 constituting the insertion space 24 is made of metal and the guides 6 and 7 made of resin are attached to the side walls 29 of the guide frame 5, the entire guide frame 5 is made of resin. Compared to the above, the amount of resin material used can be greatly reduced. Therefore, for example, when a fire occurs in a building, it is possible to reduce the possibility of fire from the resin portion due to flame heat, and it is possible to improve the fire resistance of the strike 1. In particular, since the resin guides 6 and 7 are provided only in a limited range near the strike hole 17 of the strike plate 3, it is possible to further reduce the amount of resin material used in the guide frame 5. Become.

  Thus, in this embodiment, it is possible to provide the structure of the strike 1 that can ensure fire resistance while keeping the slidability of the dead bolt 45 good.

  In the present embodiment, as described above, since the guides 6 and 7 are removably inserted between the abutment wall 34 and the troyoke 2, the guides 6 and 7 can be easily assembled to the guide frame 5. Is possible.

  In this embodiment, the guide 6 without the thin portion 44 is inserted between the troyoke 2 and the one side wall 29, and the guide 7 with the thin portion 44 is inserted between the troyoke 2 and the other side wall 29. It is out. On the other hand, in another different embodiment, it is also possible to insert the guide 6 not provided with the thin portion 44 between the troyoke 2 and both side walls 29. It can be made shorter than in the case of this embodiment. It is also possible to insert the guide 7 provided with the thin portion 44 between the troyoke 2 and both side walls 29. In this case, the facing interval between the guides is made longer than in the present embodiment. Can do. Thus, by providing the guides 6 and 7 so as to be detachable with respect to the pair of side walls 29, the guides 6 and 7 having different thicknesses can be selectively inserted into and removed from the side walls 29. The opposing distance between the guides 6 and 7 can be changed in accordance with the expected insertion / removal direction of the dead bolt 45 with respect to the strike hole 17 of the strike plate 3.

<Second Embodiment>
Next, a second embodiment of the structure of the strike 1 according to the present invention will be described with reference to FIGS. Hereinafter, the case where the right side in FIG. 6 is the front side (front side) of each member will be described.

  As shown in FIG. 6, the strike 1 includes a troyoke 2 having a bottomed box shape with an opening on the front side, a strike plate 3 provided to close the troyoke 2 opening, and an upper end of the troyoke 2. The magnet 4 housed in the part, the guide frame 5 housed in the lower end of the troyoke 2, and a pair of guides 6 and 7 attached to the peripheral wall 28 of the guide frame 5 (only one guide 6 is shown in FIG. 6) And the main constituent.

  The troyoke 2 has a shape that is long in the vertical direction, and is embedded in the door frame 8 of a building such as a condominium or a hotel so as to be opposed to the mouth 10 of the door 9. Fixing rods 11 are provided at both upper and lower ends of the trowel 2, and fitting holes 12 are formed in the fixing rod 11 in the horizontal direction. A fixing screw hole 51 is formed in the horizontal direction at the center of the bottom surface of the troyoke 2 in the vertical direction.

  The strike plate 3 has a flat plate shape that is long in the vertical direction. Screw holes 16 are drilled in the horizontal direction at both upper and lower ends of the strike plate 3. The strike plate 3 around the screw hole 16 is bent rearward and fitted into the fitting hole 12 of the troyoke 2. The strike plate 3 and the trolley 2 are configured to be fixed to the door frame 8 of the building by screws (not shown) inserted through the screw holes 16. A communication hole 52 is formed in the horizontal direction in the upper part of the strike plate 3, and a strike hole 17 is formed in the horizontal direction in the lower part of the strike plate 3.

  The magnet 4 has a rectangular parallelepiped shape, and its rear surface is supported by a yoke 18 having a U-shaped cross section. The magnet 4 and the yoke 18 are held by a magnet holder 53 provided from the upper end in the troyoke 2 to the lower part of the center part. The magnet holder 53 is formed of a stainless steel material such as SUS304. The magnet holder 53 includes a fixing portion 54 having a bottomed box shape with the front side opened, and a holding portion 55 provided above the fixing portion 54. A magnet cover 56 is provided on the front side of the magnet holder 53 so as to close the communication hole 52 of the strike plate 17, and the surface of the magnet 4 is covered by the magnet cover 56.

  A fixing screw hole 58 is formed in the horizontal direction below the bottom plate 57 of the fixing portion 54. The magnet holder 53 is fixed to the troyoke 2 by screwing the fixing screw 59 inserted into the fixing screw hole 51 of the troyoke 2 into the fixing screw hole 58 of the bottom plate 57. The lower end plate 60 of the fixing portion 54 is set such that the protruding length from the bottom plate 57 is lower than the protruding length of the upper end plate 61 from the bottom plate 57.

  The holding portion 55 includes a pair of support plates 62 extending upward from both side plates 69 of the fixed portion 54, a pair of bent plates 63 provided inward from the upper ends of the pair of support plates 62, In the space surrounded by the bottom surface of the troyoke 2, the magnet cover 56, the pair of support plates 62, the pair of bending plates 63, and the upper end plate 61 of the fixed portion 54, the magnet 4 The yoke 18 is accommodated.

  The guide frame 5 is formed of a stainless steel material such as SUS304. As shown in FIGS. 7A and 7B, the guide frame 5 has a rectangular tube shape with the front side and the rear side opened, and forms an insertion space 24 having a substantially rectangular parallelepiped shape. Yes. The upper surface of the upper end wall 35 of the guide frame 5 is in contact with the lower end plate 60 of the fixing portion 54 of the magnet holder 53 (see FIG. 6).

  A flange 64 is provided at each of the front end portions of the upper and lower end walls 35 and 36 of the guide frame 5. A cutting portion 66 is provided from the front end portion to the lower end portion at the center in the left-right direction of the upper end wall 35 and the flange portion 64 provided on the upper end wall 35. The upper end wall 35 is provided with an engaging protrusion 67 on one side of the cutting portion 66, an engaging groove 68 is provided on the other side of the cutting portion 66, and the engaging protrusion 67 engages with the engaging groove 68. Yes. At the rear end portions of the upper and lower end walls 35 and 36, a contact piece 65 having a tapered shape at the front end side is projected.

  A pair of side walls 29 facing each other are provided on the peripheral wall 28 of the guide frame 5 along the inner side surface 30 of the troyoke 2 (see FIG. 8). Each side wall 29 is provided with a U-shaped notch 71 along the opening end 70 on the front side of the insertion space 24. A stepped portion 72 projects from the inner portion of the cutout portion 71, and fitting grooves 73 are respectively formed in the stepped portion 72 at the rear side and the lower side of the upper and lower ends.

  The pair of guides 6 and 7 are formed of the same length by a synthetic resin such as POM, for example, and are formed in a flat plate shape that forms a vertically long rectangle in a side view. At the upper and lower edges and the rear edge of each guide 6, 7, a stepped portion 74 protrudes from the outer portion, and inside the stepped portion 74, at a position corresponding to each fitting groove 73 of the guide frame 5. A fitting protrusion 75 is provided. Then, the stepped portions 72 of the guide frame 5 and the stepped portions 74 of the guides 6 and 7 are engaged so that the fitting protrusions 75 of the guides 6 and 7 are fitted into the fitting grooves 73 of the guide frame 5. As a result, the guides 6 and 7 are fixed to the guide frame 5 (see FIGS. 6 and 8). That is, the guides 6 and 7 are provided in the cutout portion 71 so as to be detachable. An inclined surface 76 is provided on the outer portion of the front edge of each guide 6, 7 so as to incline backward toward the outside. On the outer surface of each of the guides 6 and 7, four square cutout portions 43 each having an R shape at four corners are recessed at regular intervals. A rib 77 protrudes from the front end portion of the upper and lower end edges of each guide 6, 7, and an inclined surface 78 is provided on the front surface of the rib 77.

  The thicknesses of the guides 6 and 7 are such that the outer surfaces of the guides 6 and 7 are close to or in contact with the inner surface 30 of the trolley 2, and the inner surfaces of the guides 6 and 7 are inward from the inner surfaces of the side walls 29 of the guide frame 5. It is adjusted to protrude. In the present embodiment, the other guide 7 is formed thicker than the one guide 6, and accordingly, the other guide 7 protrudes inward from the inner surface of each side wall 29 more greatly than the one guide 6. It is configured.

  Since the configuration and operation of the deadbolt 45 are the same as those in the first embodiment, description thereof is omitted. When the dead bolt 45 is inserted into and removed from the insertion space 24 of the guide frame 5, the dead bolt 45 normally does not contact the guides 6 and 7. On the other hand, for example, when a large lateral pressure is applied to the dead bolt 45 as in the case of performing an unlocking operation while pushing the door 9, a resin-made product that protrudes inward from the inner surface of each side wall 29 of the guide frame 5. Dead bolts 45 are in sliding contact with the guides 6 and 7. Therefore, the slidability of the dead bolt 45 can be kept good as in the first embodiment. Since the guide frame 5 constituting the insertion space 24 is made of metal and the resin guides 6 and 7 are attached to the side walls 29 of the guide frame 5, the strike 1 is the same as in the first embodiment. It becomes possible to improve the fire resistance. In particular, since the resin guides 6 and 7 are provided only in a limited range near the strike hole 17 of the strike plate 3, it is possible to further reduce the amount of resin material used in the guide frame 5. Become.

  In the present embodiment, as described above, since the guides 6 and 7 are fitted to the notches 71 of the guide frame 5, the guides 6 and 7 are attached to the guide frame 5 in a narrow space. Is possible.

  In the present embodiment, the guide 6 is fitted to one side wall 29, and the guide 7 having a thickness larger than that of the guide 6 is fitted to the other side wall 29. On the other hand, in another different embodiment, it is also possible to fit a guide having the same thickness as the guide 6 to both of the pair of side walls 29. It can be made longer than in the case of the embodiment. In addition, a guide having the same thickness as that of the guide 7 can be fitted to both the pair of side walls 29. In this case, the interval between the guides can be made shorter than in the present embodiment. it can. Thus, by providing the guides 6 and 7 so as to be detachable with respect to the pair of side walls 29, the guides 6 and 7 having different thicknesses can be selectively engaged with and detached from the side walls 29. It becomes possible to change the opposing space | interval of 6 and 7 according to the insertion / extraction prospective direction of the dead volt | bolt 4 with respect to the strike hole 17 of the strike plate 3. FIG.

  In the first and second embodiments described above, the case where the dead bolt 45 is used as the lock bolt has been described. However, in other different embodiments, other different lock bolts such as a latch bolt and a Gremon lock locking rod are used. It is also possible. In the first and second embodiments described above, the case where the structure of the strike 1 according to the present invention is applied to the door frame 8 of the building has been described. However, in another different embodiment, one of the double doors is provided. It is also possible to apply the structure of the strike 1 according to the present invention.

DESCRIPTION OF SYMBOLS 1 Strike 2 Troyoke 5 Guide frame 6 One guide 7 Other guide 9 Door 10 Wood end 24 Insertion space 28 Peripheral wall 29 Side wall 34 Abutting wall 45 Dead bolt (lock bolt)
70 Open end 71 Notch

Claims (3)

Strike structure in which a lock bolt protruding from the door mouth is inserted to restrict the opening of the door,
A strike comprising: a metal guide frame that forms an insertion space for the lock bolt; and a resin guide that is attached to the peripheral wall of the guide frame and protrudes inward from the inner surface of the peripheral wall. Structure. The guide frame is housed in a box-shaped troyoke,
The peripheral wall is provided with a pair of side walls facing each other along the inner surface of the troyoke,
An abutting wall is provided on both sides of each side wall from the inner surface of each side wall, and the guide is detachably provided between the corresponding wall and the trowel. Item 2. The strike structure according to item 1. The peripheral wall is provided with a pair of side walls facing each other,
The strike according to claim 1, wherein each side wall is provided with a notch portion along the opening end of the insertion space, and the guide is provided in the notch portion so as to be detachable. Construction.