JP2020076215A - Outer frame fixing structure - Google Patents

Abstract

To provide a fixing structure of an outer frame capable of easily coping with a change in the thickness of a floor.SOLUTION: An outer frame has a flange part and a guide groove, and the outer frame is provided with a fixing device 6 for fixing the outer frame to a floor; the fixing device 6 has a movable mounting member 24 guided by the guide groove and a rotatable fixing member 25 provided on the mounting member 24; a mounting hole 26 is formed in the mounting member 24, and the fixing member 25 has an insertion part 28 inserted into the mounting hole 26, and a pull-out stop section 31 for preventing the fixing member from pulling out from the mounting hole 26; the outer frame is fixed to the floor by the floor being sandwiched between the flange part and the fixing member 25 which is rotated downward from the floor; the mounting member 24 has a mounting part body 34 and a split body 35 detachably attached to the mounting part body 34; a part 55 of the mounting hole 26 is formed by the mounting part body 34, and a remaining part 56 of the mounting hole 26 is formed by the split body 35; and when the split body 35 is detached from the mounting part body 34, a part of the mounting hole 26 in the circumferential direction is opened.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a fixing structure for an outer frame used for, for example, an underfloor inspection port.

  Conventionally, as a fixing structure of this type of outer frame, for example, as shown in FIGS. 25 and 26, a fixing structure of an outer frame 102 used for an underfloor inspection port 101 can be cited. That is, the outer frame 102 is fitted in the opening 104 formed in the floor 103. Further, the outer frame 102 has a flange portion 105 that abuts on the upper surface of the floor 103 around the opening 104 at the upper end portion, and has an engaging groove 106 at the lower portion.

  A fixing device 107 that fixes the outer frame 102 to the floor 103 is provided below the outer frame 102. The fixing device 107 has a mounting member 108 which is engaged with the engaging groove 106 and is supported by the outer frame 102, and a fixing member 109 which is provided on the mounting member 108.

A mounting hole 110 is formed in the mounting member 108 so as to penetrate therethrough in the vertical direction.
The fixing member 109 is formed by bending a slender round rod-shaped wire and has an insertion portion 111 that is inserted into the mounting hole 110. The fixing member 109 has the insertion portion 111 as a center and the inside of the opening 104 and below the floor 103. It is rotatable between and.

  The outer frame is fixed to the floor 103 by sandwiching the floor 103 between the collar portion 105 and the fixing member 109 that rotates below the floor 103.

  Incidentally, such a fixing structure of the outer frame 102 is described in, for example, Patent Document 1 below.

  In addition, in the fixing structure of the outer frame 102 as described above, in order to prevent the fixing member 109 from dropping downward from the mounting hole 110, the retaining portion 112 is formed at the base end portion of the fixing member 109. The retaining portion 112 is formed by flattening the base end portion of the fixing member 109 and has a width G larger than the diameter F of the fixing member 109.

  According to this, by rotating the fixing member 109 from the inside of the opening portion 104 to the lower side of the floor 103 about the insertion portion 111, the floor 103 is provided between the collar portion 105 and the free end portion 113 of the fixing member 109. And the outer frame 102 is fixed to the floor 103.

JP 2001-349050 A

  However, in the above-described conventional type, as shown in FIG. 25, when the thickness T of the floor 103 is thin or thick beyond a certain range, the flange 103 and the free end 113 of the fixing member 109 keep the floor 103 from moving. There is a possibility that the fixing member 109 and the mounting member 108 may be damaged because the outer frame 102 cannot be sufficiently fixed to the floor 103, or the fixing member 109 is excessively deformed because it cannot be sandwiched by the optimum force.

  Therefore, when the thickness T of the floor 103 changes, the size of the fixing member 109 needs to be changed accordingly. However, it is not possible to remove the fixing member 109 from the mounting member 108 and replace only the fixing member 109. This is difficult and requires a complete set of fixation devices 107. Therefore, it is necessary to prepare a plurality of types of fixing devices 107 according to the thickness T of the floor 103, and it is not possible to easily cope with the change in the thickness T of the floor 103.

  An object of the present invention is to provide a fixing structure for an outer frame that can easily cope with changes in the thickness of the floor.

In order to achieve the above object, the first aspect of the present invention is a fixing structure for an outer frame fitted in an opening of a floor,
The outer frame has, at the upper portion, a flange portion that comes into contact with the upper surface of the floor around the opening portion, and has a guide groove at the lower portion,
A fixing device for fixing the outer frame to the floor is provided at the bottom of the outer frame,
The fixing device includes a mounting member that is supported by the outer frame and is guided by the guide groove to be movable in the longitudinal direction of the guide groove, and a fixing member provided in the mounting member.
The mounting member is formed with a mounting hole penetrating in the vertical direction,
The fixing member has an insertion portion that is inserted into the attachment hole and a retaining portion that prevents the attachment member from falling out of the attachment hole, and rotates between the inside of the opening and the bottom of the floor around the insertion portion. Free,
The outer frame is fixed to the floor by sandwiching the floor between the collar portion and the fixing member that has rotated below the floor,
The mounting member has a mounting portion main body and a split body detachable from the mounting portion main body,
A part of the mounting hole in the circumferential direction is formed by the mounting portion main body,
The remaining portion in the circumferential direction of the mounting hole is formed by the divided body,
When the divided body is removed from the mounting portion main body, a part of the mounting hole in the circumferential direction is opened.

  According to this, when the fixing member is replaced with another fixing member having a different size, the split body is removed from the mounting portion main body, and a part of the mounting hole in the circumferential direction is opened. In this state, after the insertion part of the fixing member is separated from a part of the mounting hole of the mounting part main body, the insertion part of the other fixing member is fitted into a part of the mounting hole of the mounting part main body, and the divided body is attached. Attach to.

  As a result, a part of the mounting hole of the mounting portion main body and the remaining portion of the mounting hole of the divided body are combined to form a mounting hole, and the insertion portion of another fixing member is inserted into the mounting hole. Therefore, it is possible to easily replace the fixing member with another fixing member having a different size according to the change in the thickness of the floor without changing the mounting member. This makes it possible to easily deal with changes in the thickness of the floor.

  In the outer frame fixing structure according to the second aspect of the present invention, the inserting portion of the fixing member is suspended from the mounting member and is inclined at a predetermined inclination angle with respect to the vertical direction.

  According to this, when the fixing member is rotated from the inside of the opening to the lower side of the floor about the insertion portion, the free end of the fixing member gradually rises and strongly abuts on the lower surface of the floor, so that the floor of the outer frame It is strongly sandwiched between the collar and the free end of the fixing member, whereby the outer frame is firmly fixed to the floor.

In the outer frame fixing structure according to the third aspect of the present invention, the attachment portion main body has a hollow portion whose one side surface is open,
The divided body is mounted in the mounting portion main body by being inserted into the hollow portion.

  According to this, the split body can be easily attached to and detached from the mounting portion main body.

In the outer frame fixing structure according to the fourth aspect of the present invention, the mounting portion main body has an engaging piece to be inserted into the guide groove,
An engagement hole is formed in the side wall of the guide groove,
The attachment member is fixed to a predetermined position of the outer frame by the engagement piece engaging with the engagement hole.

  According to this, the engagement piece is inserted into the guide groove, and the attachment member is slid in the longitudinal direction of the guide groove to the location where the engagement hole is formed. After that, by engaging the engagement piece with the engagement hole, the attachment member can be easily fixed to a predetermined position of the outer frame.

  As described above, according to the present invention, it is possible to easily cope with changes in the thickness of the floor.

It is sectional drawing which shows the fixing structure of the outer frame of the underfloor inspection port in the 1st Embodiment of this invention. FIG. 3 is a sectional view of the outer frame of the same. FIG. 7 is a partially enlarged bottom view of the outer frame, showing a state in which the fixing device is attached to the outer frame. FIG. 7 is a partially cutaway bottom view of the outer frame, showing the orientation of the engagement pieces when the fixing device is fixed to the outer frame. FIG. 3 is a perspective view of the fixing device for the outer frame from above. FIG. 3 is an exploded perspective view of the fixing device for the outer frame from above. FIG. 3 is a partially cutaway perspective view of the fixing device for the outer frame from above. FIG. 3 is a partially cutaway exploded perspective view of the fixing device for the outer frame from above. FIG. 3 is a perspective view of the fixing device for the outer frame from below. FIG. 3 is an exploded perspective view of the outer frame fixing device from below. It is a XX arrow line view in FIG. FIG. 7 is a partially cutaway bottom view of the outer frame, showing the orientation of the engagement pieces when the fixing device is slid along the outer frame. FIG. 3 is a partially cutaway perspective view of the attachment member of the fixing device for the outer frame. FIG. 7 is a bottom view of the mounting member of the fixing device for the outer frame. FIG. 7 is a bottom view of the mounting member of the fixing device for the outer frame, showing a state in which the split body is removed from the mounting portion main body. It is a XX arrow line view in FIG. It is a YY arrow line view in FIG. FIG. 6 is a cross-sectional view showing the fixing structure of the outer frame of the underfloor inspection port, showing a state where the fixing member is replaced with another fixing member having a different insertion portion length. It is a partially notched perspective view of the attachment member of the fixing device in the 2nd Embodiment of this invention. FIG. 5 is a bottom view of the mounting member of the fixing device. FIG. 3 is a partially cutaway exploded perspective view of the fixing device from above. FIG. 3 is an exploded perspective view of the fixing device from below. It is a XX arrow line view in FIG. It is a XX arrow line view in FIG. It is sectional drawing which shows the conventional fixing structure of the outer frame of the underfloor inspection port. FIG. 3 is a perspective view of the fixing device for the outer frame.

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

(First embodiment)
In the first embodiment, as shown in FIG. 1 to FIG. 4, 1 is an underfloor inspection port, and this underfloor inspection port 1 has a rectangular opening 3 formed on a floor 2 and an opening 3. It has a fitted outer frame 4, a lid 5 for opening and closing the opening 3, and a plurality of fixing devices 6 for fixing the outer frame 4 to the floor 2.

  The floor 2 has a particle board 9 and an integrated material 10 provided on the particle board 9.

  The outer frame 4 is a quadrangular frame having four sides, and is provided with the standing wall portion 12 standing up along the inner peripheral surface of the opening portion 3 and the opening portion 3 formed continuously from the upper end of the standing wall portion 12 toward the outside. It has a collar portion 13 that abuts on the upper surface of the floor 2 around and a receiving portion 14 that is continuous from the lower portion of the standing wall portion 12 toward the inside. The lid 5 is fitted in the outer frame 4 and received by the receiving portion 14.

  A guide groove 16 is formed at the lower end of the outer frame 4 over the entire circumference. The lower side of the guide groove 16 is open, and the width W1 of the opening 17 of the guide groove 16 is set to be smaller than the width W2 inside the guide groove 16. Further, the guide groove 16 has a pair of inner and outer side walls 19 and 20 facing each other in the width direction. Engagement holes 22 are formed in the outer wall 19 at a plurality of predetermined positions in the longitudinal direction A of the guide groove 16.

  As shown in FIGS. 4 to 10, the fixing device 6 is detachably attached to the lower end portion of the outer frame 4 using the guide groove 16. Such a fixing device 6 includes a mounting member 24 supported by the outer frame 4 and guided by the guide groove 16 and movable in the longitudinal direction A of the guide groove 16, and a fixing member 25 provided on the mounting member 24. have.

  As shown in FIGS. 7, 13, and 14, the mounting member 24 is provided with a mounting hole 26 penetrating in the vertical direction.

  The fixing member 25 is a wire rod having an elongated round bar shape, and includes an insertion portion 28 that is inserted into the mounting hole 26, a distal end portion 29 (a free end portion) that is bent upward, and a lower end and a distal end portion 29 of the insertion portion 28. It has a lateral arm portion 30 that connects the lower end and a retaining portion 31 that prevents the lower arm portion from falling off from the mounting hole 26, and between the inside of the opening portion 3 and the lower portion of the floor 2 around the insertion portion 28. It is rotatable.

  As shown in FIGS. 6 and 10, the retaining portion 31 is formed by flattening the base end portion of the fixing member 25 and has a width G larger than the diameter F of the fixing member 25.

  As shown by the solid line in FIG. 1 and the solid line in FIG. 3, the outer frame 4 is fixed to the floor 2 by sandwiching the floor 2 between the collar portion 13 and the fixing member 25 rotated below the floor 2. There is. Note that, as shown in FIG. 11, the insertion portion 28 of the fixing member 25 is hung from the mounting member 24 and is inclined at a predetermined inclination angle B (for example, about 15 °) with respect to the vertical direction.

  The mounting member 24 has a mounting portion main body 34 and a split body 35 that is detachable from the mounting portion main body 34. The mounting portion main body 34 includes a substrate 37, a holding body 38 that is integrally provided on the lower side of the substrate 37, and an engagement piece 39 that is integrally provided on the upper side of the substrate 37.

  The holding body 38 has a pair of front and rear end walls 42, a side wall 43, a bottom wall 44, and a hollow portion 45 having one side surface opened and the other side surface closed by the side wall 43. The side wall 43 is provided with a protrusion 46 that protrudes into the hollow portion 45.

  As shown in FIG. 5, the length C of the engagement piece 39 is formed longer than the width D. As shown in FIG. 12, the longitudinal direction E of the engagement piece 39 is the longitudinal direction A of the guide groove 16. By setting the same direction, the engagement piece 39 can be inserted into and removed from the guide groove 16 through the opening 17. Further, with the engagement piece 39 inserted in the guide groove 16, the mounting portion main body 34 is rotated 90 °, and the longitudinal direction E of the engagement piece 39 is changed to the longitudinal direction of the guide groove 16 as shown in FIGS. By making it orthogonal to the direction A, the tip portion 39 a of the engagement piece 39 engages with the engagement hole 22 of the guide groove 16.

  The split body 35 has an upper plate 49, a lower plate 50, and a side plate 51 provided between the upper plate 49 and the lower plate 50, and by being inserted into the hollow portion 45, the mounting portion main body 34. It is installed inside.

  As shown in FIGS. 8, 10, and 13 to 17, a portion 55 of the mounting hole 26 in the circumferential direction (hereinafter, referred to as a portion 55 of the mounting hole 26) is formed by the mounting portion main body 34. That is, a part 55 of the attachment hole 26 is a U-shaped notch, is formed in the bottom wall 44 and the protrusion 46 of the holding body 38, penetrates in the up-down direction, and is the same as the hollow portion 45. The sides are open. Incidentally, as shown in FIG. 16, the central axis passing through the center of the portion 55 of the mounting hole 26 is inclined at a predetermined inclination angle B with respect to the vertical direction.

  Further, the remaining portion 56 of the mounting hole 26 in the circumferential direction (hereinafter, referred to as the remaining portion 56 of the mounting hole 26) is formed by the divided body 35. That is, the remaining portion 56 of the mounting hole 26 is a U-shaped notch, is formed in the upper plate 49 and the lower plate 50 of the split body 35, penetrates in the up-down direction, and has a portion 55 of the mounting hole 26. On the contrary, the other side is open. Incidentally, as shown in FIG. 17, the central axis passing through the center of the remaining portion 56 of the mounting hole 26 is inclined at a predetermined inclination angle B with respect to the vertical direction.

  As a result, when the split body 35 is removed from the mounting portion main body 34, a part of the mounting hole 26 in the circumferential direction is opened.

  The operation of the above configuration will be described below.

  As shown in FIG. 12, the longitudinal direction E of the engagement piece 39 of the fixing device 6 is set to the same direction as the longitudinal direction A of the guide groove 16, the engagement piece 39 is inserted into the guide groove 16, and the mounting member 24 is The guide groove 16 is slid in the longitudinal direction A to a position where the engagement hole 22 is formed. After that, as shown in FIGS. 1 and 4, the mounting member 24 is rotated 90 ° and the longitudinal direction E of the engaging piece 39 is made orthogonal to the longitudinal direction A of the guide groove 16, whereby the tip 39a of the engaging piece 39 is formed. Engages with the engagement hole 22 of the guide groove 16. As a result, the fixing device 6 is easily mounted and fixed at a predetermined position on the outer frame 4.

After that, as shown by the solid line in FIG. 1 and the solid line in FIG. 3, the fixing member 25 is rotated about the insertion portion 28 from the inside of the opening 17 to the lower side of the floor 2, so that the inclination angle B of the insertion portion 28 is increased. Accordingly, the tip portion 29 of the fixing member 25 gradually rises and strongly abuts on the lower surface of the floor 2, so that the floor 2 is strongly sandwiched between the flange portion 13 of the outer frame 4 and the tip portion 29 of the fixing member 25. As a result, the outer frame 4 is firmly fixed to the floor 2.
Further, as shown by the phantom line in FIG. 1 and the phantom line in FIG. 3, the fixing member 25 is moved from below the floor 2 into the opening 17 around the insertion portion 28 of the fixing device 6 fixed to the outer frame 4. As shown in FIG. 12, the mounting member 24 is rotated 90 degrees so that the longitudinal direction E of the engaging piece 39 is in the same direction as the longitudinal direction A of the guide groove 16 and the engaging piece 39 is removed from the inside of the guide groove 16. The fixing device 6 can be easily removed from the outer frame 4 by separating the fixing device 6 downward.

  Further, when replacing the fixing member 25 with another fixing member 60 (see FIG. 18) having a different length of the insertion portion 28, the fixing device 6 is removed from the outer frame 4 and the fixing device 6 is removed as shown in FIGS. As shown in FIG. 6, by separating the split body 35 from the hollow portion 45 of the mounting portion main body 34, the split body 35 can be easily removed from the mounting portion main body 34, and a part of the mounting hole 26 in the circumferential direction is opened. To be done. In this state, after removing the insertion portion 28 of the fixing member 25 from the part 55 of the attachment hole 26 of the attachment portion main body 34, the insertion portion 28 of another fixing member 60 (see FIG. 18) is attached to the attachment portion main body 34. The split body 35 is fitted into a portion 55 of the hole 26, and the split body 35 is inserted into the hollow portion 45 of the mounting portion main body 34. As a result, the divided body 35 can be easily mounted on the mounting portion main body 34, and a part 55 of the mounting hole 26 of the mounting portion main body 34 and the remaining portion 56 of the mounting hole 26 of the divided body 35 are vertically overlapped. The attachment hole 26 is formed by combining, and the insertion portion 28 of another fixing member 60 is inserted into the attachment hole 26.

  For this reason, as shown in FIG. 18, the fixing member 25 can be easily changed to another fixing member 60 having a different length of the insertion portion 28 according to the change in the thickness T of the floor 2 while the mounting member 24 remains the same. Can be exchanged. This makes it possible to easily cope with changes in the thickness T of the floor 2.

  When the thickness T of the floor 2 is increased, the insertion portion 28 may be replaced with a long fixing member 60, and when the thickness T of the floor 2 is thin, the insertion portion 28 may be replaced with a short fixing member 25.

  In the first embodiment, as shown in FIGS. 1 and 18, the fixing member 25 is replaced with another fixing member 60 having a different length of the insertion portion 28. The fixing members are not limited to the fixing members 25 and 60 having different lengths, and may be replaced with fixing members having different lengths of the distal end portion 29 and the lateral arm portion 30.

(Second embodiment)
In the second embodiment, as shown in FIGS. 19 to 24, the attachment member 24 is provided with two (a plurality of) attachment holes 26 and 70 penetrating in the vertical direction.

  Portions 55 and 71 of the first and second mounting holes 26 and 70 in the circumferential direction (hereinafter, referred to as portions 55 and 71 of the first and second mounting holes 26 and 70) are formed by the mounting portion main body 34. Has been done. That is, the portions 55 and 71 of the first and second mounting holes 26 and 70 are U-shaped notches, respectively, which are formed in the bottom wall 44 and the protrusion 46 of the holding body 38 and penetrate vertically. At the same time, like the hollow portion 45, one side surface is open.

  The central axis passing through the center of the portion 55 of the first mounting hole 26 is inclined at a predetermined inclination angle B with respect to the vertical direction as in the first embodiment, and the second mounting hole 70 is The central axis passing through the center of the part 71 is inclined at another inclination angle J different from the predetermined inclination angle B.

  Further, the remaining portions 56, 72 in the circumferential direction of the first and second mounting holes 26, 70 (hereinafter, referred to as the remaining portions 56, 72 of the first and second mounting holes 26, 70) are divided bodies. It is formed by 35. That is, the remaining portions 56 and 72 of the first and second mounting holes 26 and 70 are U-shaped notches, are formed in the upper plate 49 and the lower plate 50 of the split body 35, and penetrate vertically. At the same time, the other side surface is open, as opposed to the parts 55 and 71 of the mounting holes 26 and 70.

  The central axis passing through the center of the remaining portion 56 of the first attachment hole 26 is inclined at a predetermined inclination angle B with respect to the vertical direction as in the first embodiment, and the second attachment hole 70 is formed. The central axis passing through the center of the remaining portion 72 of the is tilted at another tilt angle J different from the predetermined tilt angle B.

  As a result, when the split body 35 is removed from the mounting portion main body 34, a part of the first and second mounting holes 26, 70 in the circumferential direction is opened.

  The operation of the above configuration will be described below.

  The split body 35 is attached to and detached from the attachment portion main body 34 of the attachment member 24, and the insertion portion 28 of the fixing member 25 is inserted into the first attachment hole 26, whereby the insertion portion 28 is inclined at a predetermined inclination angle B. In this state, the fixing member 25 can be attached to the attaching member 24.

  Further, by detaching the split body 35 from the mounting portion main body 34 and inserting the insertion portion 28 of the fixing member 25 into the second mounting hole 70, the insertion portion 28 can be tilted at another inclination angle J. The fixing member 25 can be attached to the attaching member 24.

  Thereby, the fixing member 25 can be attached to the attaching member 24 at two different inclination angles B and J, so that the fixing member 25 can be attached at an optimum angle according to the thickness T of the floor 2 and the like. ..

  In the second embodiment, as shown in FIGS. 19 and 20, two mounting holes 26 and 70 having different inclination angles B and J are formed in the mounting member 24, but the inclination angles are different. Alternatively, three or more mounting holes may be formed.

  In each of the above-described embodiments, as shown in FIG. 1, the fixing structure in which the outer frame 4 fitted in the opening 3 of the underfloor inspection port 1 is fixed by a plurality of fixing devices 6 is shown. The fixing structure is not limited to this, and may have a fixing structure in which an outer frame fitted in an opening of an underfloor storage or the like is fixed by a plurality of fixing devices 6, for example.

2 floor 3 opening 4 outer frame 6 fixing device 13 flange 16 guide groove 19 side wall 22 engaging hole 24 mounting member 25 fixing member 26 mounting hole, first mounting hole 28 insertion portion 31 retaining portion 34 mounting portion main body 35 division Body 39 Engagement piece 45 Hollow part 55 Part of mounting hole in circumferential direction 56 Remaining part of mounting hole in circumferential direction 60 Other fixing member 70 Second mounting hole 71 Part of mounting hole in circumferential direction 72 Mounting hole Remaining part in the direction A Longitudinal direction B of the guide groove Predetermined inclination angle J Another inclination angle

Claims (4)

A fixed structure of an outer frame fitted into the opening of the floor,
The outer frame has, at the upper portion, a flange portion that comes into contact with the upper surface of the floor around the opening portion, and has a guide groove at the lower portion,
A fixing device for fixing the outer frame to the floor is provided at the bottom of the outer frame,
The fixing device includes a mounting member that is supported by the outer frame and is guided by the guide groove and is movable in the longitudinal direction of the guide groove, and a fixing member provided in the mounting member.
The mounting member is formed with a mounting hole penetrating in the vertical direction,
The fixing member has an insertion portion that is inserted into the attachment hole and a retaining portion that prevents the attachment member from falling out of the attachment hole, and rotates between the inside of the opening and the bottom of the floor around the insertion portion. Free,
The outer frame is fixed to the floor by sandwiching the floor between the collar portion and the fixing member that has rotated below the floor,
The mounting member has a mounting portion main body and a split body detachable from the mounting portion main body,
A part of the mounting hole in the circumferential direction is formed by the mounting portion main body,
The remaining portion in the circumferential direction of the mounting hole is formed by the divided body,
A fixing structure for an outer frame, wherein when the divided body is removed from the mounting portion main body, a part of the mounting hole in the circumferential direction is opened. The outer frame fixing structure is characterized in that the inserting portion of the fixing member is hung from the attaching member and is inclined at a predetermined inclination angle with respect to the vertical direction. The mounting part body has a hollow part with one side open,
The outer frame fixing structure according to claim 1 or 2, wherein the split body is mounted in the mounting portion main body by being inserted into the hollow portion. The mounting portion main body has an engaging piece that is inserted into the guide groove,
An engagement hole is formed in the side wall of the guide groove,
The fixing of the outer frame according to any one of claims 1 to 3, wherein the attachment member is fixed to a predetermined position of the outer frame by the engagement piece engaging with the engagement hole. Construction.

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