Patent Publication Number: US-2022231496-A1

Title: Electrical connection box

Description:
TECHNICAL FIELD 
     The present disclosure relates to an electrical connection box. 
     BACKGROUND 
     Heretofore, electrical connection boxes such as relay boxes and fuse boxes have been used in vehicles for the purpose of increasing the efficiency of electric wiring and improving maintainability (e.g., see Patent Document 1). An electrical connection box is equipped with electrical components such as relays and fuses as appropriate, and is configured to supply power from a battery or the like to in-vehicle electrical equipment. Also, a plurality of electrical wires are connected to the electrical components in the electrical connection box. A wire harness consisting of a bundle of these wires is drawn outside a box-like main body part of the electrical connection box through a harness insertion channel formed to pass through the main body part. 
     PRIOR ART DOCUMENT 
     Patent Document 
     Patent Document 1: JP 2013-074681 A 
     SUMMARY OF THE INVENTION 
     Problems to be Solved 
     The inventors of the present invention investigated how to inhibit infiltration of rainwater and the like into the box-like main body part through the harness insertion channel in electrical connection boxes such as the above. 
     In view of this, an object of the invention is to provide an electrical connection box that is able to ensure water stopping capability in a harness insertion channel 
     Means to Solve the Problem 
     An electrical connection box of the present disclosure includes a box-like main body part having a harness insertion channel, a wire harness drawn outside the main body part through the harness insertion channel from inside the main body part, and a water stopping sheet wrapped around an outer circumferential surface of the wire harness in the harness insertion channel, the water stopping sheet being characterized by having higher water stopping capability due to being compressed than when not compressed, and the water stopping sheet being rendered into a water stopping state by being compressed by the harness insertion channel and the outer circumferential surface of the wire harness. 
     Effect of the Invention 
     According to the present disclosure, it becomes possible to provide an electrical connection box that is able to ensure water stopping capability in a harness insertion channel 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view showing a schematic configuration of an electrical connection box according to an embodiment. 
         FIG. 2  is an exploded perspective view showing a configuration of the periphery of a harness insertion channel in the electrical connection box of the embodiment. 
         FIG. 3  is a schematic cross-sectional view for describing a mode of assembling a wire harness to the harness insertion channel in the electrical connection box of the embodiment. 
         FIG. 4  is a schematic cross-sectional view showing the configuration of the periphery of the harness insertion channel in the electrical connection box of the embodiment. 
     
    
    
     DETAILED DESCRIPTION TO EXECUTE THE INVENTION 
     DESCRIPTION OF EMBODIMENTS OF DISCLOSURE 
     Initially, embodiments of the present disclosure will be enumerated and described. 
     [1] An electrical connection box of the present disclosure includes a box-like main body part having a harness insertion channel, a wire harness drawn outside the main body part through the harness insertion channel from inside the main body part, and a water stopping sheet wrapped around an outer circumferential surface of the wire harness in the harness insertion channel, the water stopping sheet being characterized by having higher water stopping capability due to being compressed than when not compressed, and the water stopping sheet being rendered into a water stopping state by being compressed by the harness insertion channel and the outer circumferential surface of the wire harness. Water stopping capability in the harness insertion channel can thereby be ensured by a water stopping sheet that is rendered into a water stopping state by being compressed by the harness insertion channel and the outer circumferential surface of the wire harness. 
     [2] Preferably, the water stopping sheet is formed with semi-closed cell foam. Also, since semi-closed cell foam is readily deformable compared with closed cell foam, it becomes possible to inhibit deterioration of the assemblability of the water stopping sheet. 
     [3] Preferably, the harness insertion channel has a structure divided into a first divided part and a second divided part in a circumferential direction, and an inner circumferential surface of the harness insertion channel is provided with a sloped surface sloping relative to a central axis of the harness insertion channel It is thereby possible to apply sufficient pressure to the water stopping sheet to ensure the water stopping capability, while keeping the force needed to assemble the first divided part and the second divided part to the portion of the wire harness wrapped in the water stopping sheet to a small force. 
     [4] Preferably, at a wrapping end part of the water stopping sheet, there is an overlapping part in which the number of laminations of the water stopping sheet is greater than at other portions in the circumferential direction. According to this configuration, the thickness (lamination thickness) of the water stopping sheet is not uniform in the circumferential direction, but even in such a case, it is possible to prevent the occurrence of portions where the water stopping sheet is not compressed to a water stopping state, by providing the above sloped surface on the inner circumferential surface of the harness insertion channel. 
     [5] Preferably, the harness insertion channel is formed to extend on an outer side of the main body part from an outer surface of the main body part, and the sloped surface is formed from an inner side end part of the harness insertion channel to an outer side end part of the harness insertion channel. The sloped surface can thereby be constituted to have a gentle slope angle, and, as a result, it becomes possible to apply a favorable pressure to the water stopping sheet. 
     DETAILS OF EMBODIMENTS OF DISCLOSURE 
     Specific examples of an electrical connection box of the present disclosure will be described below with reference to the drawings. Note that the invention is not limited to these illustrative examples, and is indicated by the claims, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein. Also, in the drawings, parts of the configuration may be shown in an exaggerated manner for convenience of description. The size ratios of various portions may also differ from the actual size ratios. 
     As shown in  FIG. 1 , an electrical connection box  10  has a box-like main body part  15 , an electrical component  12  housed in the electrical connection box  10 , and a cover  13  assembled to the main body part  15  of the electrical connection box  10 . The electrical connection box  10  of the present embodiment is constituted as a relay box, a fuse box or the like that is mounted between a plurality of pieces of electrical equipment installed in a vehicle and a battery or the like, and supplies power to the electrical equipment. Note that, the electrical component  12  of the present embodiment is constituted by one or a plurality of relay modules having a plurality of relays, one or a plurality of fuse modules having a plurality of fuses, or the like, for example. Also, the main body part  15  and the cover  13  are injection-molded parts that are made from a synthetic resin material, for example. 
     An approximately cylindrical harness insertion channel  14  for drawing out a wire harness W consisting of a bundle of wires connected to the electrical component  12  is formed in an outer wall of the box-like main body part  15 . The harness insertion channel  14  is formed to extend on the outer side of the main body part  15  from the outer surface of the box-like main body part  15 . The wire harness W connected to the electrical component  12  inside the electrical connection box  10  is drawn outside the electrical connection box  10  through the harness insertion channel  14 . Note that the numbers of electrical components  12  and electrical wires connected to the electrical component  12  differ in specification depending on the type or grade of vehicle. 
     The electrical connection box  10  has a separate component  16  assembled to the main body part  15 . The separate component  16  constitutes part of the outer wall of the electrical connection box  10  (more specifically, outer wall of main body part  15 ). The separate component  16  is mounted to an attachment recessed part  17  formed in a cutout manner in an outer wall  15   a  of the box-like main body part  15  in a mode of being slid in an attachment direction D. The attachment direction D of the separate component  16  of the present embodiment is set to be orthogonal to the length direction of the harness insertion channel  14  (orthogonal to opening direction of harness insertion channel  14 , i.e., length direction of wire harness W passing through harness insertion channel  14 ). Note that orthogonal in the present disclosure does not mean orthogonal in the strict sense, and has a margin in a range in which the effects of the invention are achieved as long as the range can be regarded as being orthogonal. 
     Configuration of Harness Insertion Path  14   
     As shown in  FIGS. 2 and 3 , the approximately cylindrical harness insertion channel  14  has a structure divided in half in the circumferential direction thereof. That is, the harness insertion channel  14  is provided with a first divided part  21  constituting one half portion in the circumferential direction thereof, and a second divided part  22  constituting the remaining half portion in the circumferential direction. 
     The first divided part  21  is formed on the box-like main body part  15 . Specifically, the first divided part  21  extends on the outer side of the electrical connection box  10  from a bottom edge part of the attachment recessed part  17 . The second divided part  22  is formed on the separate component  16 . Specifically, the second divided part  22  extends on the outer side of the electrical connection box  10  from the leading end part of the separate component  16  in the attachment direction D. The first divided part  21  and the second divided part  22  each have a circular arc shape as viewed from the length direction of the harness insertion channel  14  (length direction of wire harness W passing through harness insertion channel  14 ). The approximately cylindrical shape of the harness insertion channel  14  is formed by the first divided part  21  and the second divided part  22  being brought together. Also, the first divided part  21  and the second divided part  22  oppose each other along the entire length of the harness insertion channel  14 . 
     A sloped surface  23  sloping relative to the length direction of the harness insertion channel  14  (length direction of wire harness W passing through harness insertion channel  14 ) is formed on the inner circumferential surface of the harness insertion channel  14 . In the present embodiment, the sloped surface  23  is formed along the entire length of the harness insertion channel  14 . That is, the sloped surface  23  is formed from an inner side end part  14   a  to an outer side end part  14   b  of the harness insertion channel  14 . Also, the sloped surface  23  slopes so as to narrow radially toward the outer side end part  14   b  of the harness insertion channel  14 . That is, the sloped surface  23  slopes so as to approach a central axis L of the harness insertion channel  14  (central axis along length direction; see  FIG. 4 ) toward the outer side end part  14   b  of the harness insertion channel  14 . Also, the sloped surface  23  is formed at a portion where the wire harness W wrapped in a water stopping sheet  30  is sandwiched by the first divided part  21  and the second divided part  22 . That is, the portion of the wire harness W wrapped in the water stopping sheet  30  is sandwiched by the sloped surface  23  on the first divided part  21  side and the sloped surface  23  on the second divided part  22  side. 
     A locking raised part  24  that protrudes on the inner circumference side is formed on the inner circumferential surface (sloped surface  23 ) of the first divided part  21 . Also, a locking raised part  25  that protrudes on the inner circumference side is formed on the inner circumferential surface (sloped surface  23 ) of the second divided part  22 . In a state where the first divided part  21  and the second divided part  22  are brought together, the locking raised part  24  of the first divided part  21  and the locking raised part  25  of and the second divided part  22  form a ring shape continuously in the circumferential direction. 
     As shown in  FIGS. 3 and 4 , a tubular exterior member X that covers the outer circumference of the wire harness W is mounted to the wire harness W that is inserted into the harness insertion channel  14  (see  FIG. 4 ). The exterior member X of the present embodiment is a corrugated tube having a bellows structure in which an annular raised part Xa and an annular recessed part Xb are connected alternately along the length direction, for example. Note that a resin material that does not have conductivity is used as the material of the exterior member X. Also, as for the resin material that is used for the exterior member X, a synthetic resin such as polyolefin, polyamide, polyester and ABS resin can be used, for example. 
     In a state where the separate component  16  is assembled to the main body part  15 , the locking raised part  24  of the first divided part  21  and the locking raised part  25  of the second divided part  22  fit into the annular recessed part Xb of the exterior member X. Position shift of the exterior member X in the length direction of the wire harness W is thereby inhibited. 
     Configuration of Water Stopping Sheet  30   
     The water stopping sheet  30  is interposed between the inner circumferential surface of the harness insertion channel  14  and the outer circumferential surface of the wire harness W. The water stopping sheet  30  is wrapped around the outer circumference of the exterior member X. The water stopping sheet  30  has an overlapping part  30   a  (overlap margin) where, at the wrapping end part, the number of laminations of the water stopping sheet  30  is greater than at other portions in the circumferential direction. Thus, the water stopping sheet  30  is thicker at the overlapping part  30   a  than at other portions. Accordingly, the thickness (lamination thickness) of the water stopping sheet  30  is not uniform in the circumferential direction (wrapping direction) of the wire harness W. Note that the water stopping sheet  30  of the present embodiment in a state before being wrapped around the wire harness W is formed in a rectangular shape. 
     The water stopping sheet  30  is formed with semi-closed cell foam whose main component is EPDM (ethylene propylene diene rubber), for example. Semi-closed cell foam is constituted with some of the cells inside the foam being interconnected, and has portions that lack water stopping capability, but is able to ensure sufficient water stopping capability due to the cells that are constituted in an interconnected manner collapsing under compression. Note that, as for the semi-closed cell foam that is used for the water stopping sheet  30  of the present embodiment, Everlight Moran produced by Bridgestone Corporation (registered trademark), EPT-sealer produced by Nitto Denko Corporation (registered trademark) and the like can be employed, for example. 
     Here, urethane foam that is generally used as the water stopping sheet in a conventional electrical connection box is formed with open cell foam. Given that open cell foam is constituted with substantially all of the cells being interconnected with adjacent cells, there is a limit to ensuring water stopping capability, since it is difficult to prevent infiltration of water that has passed through interconnected cells even when the foam is compressed. In particular, in the case of using aluminum wires (aluminum alloy wires) for the wires of the wire harness W, and connecting these aluminum wires to a different type of metal (copper terminals, etc.) within the electrical connection box  10 , a higher level of water stopping capability in the harness insertion channel  14  is required in order to prevent electric corrosion, but this higher level of water stopping capability is difficult to achieve with open cell foam. 
     Also, given that closed cell foam which differs from semi-closed cell foam is constituted with the cells inside the foam being independent from each other, closed cell foam has water stopping capability even in a natural state. However, closed cell foam is not as readily deformable as semi-closed cell foam, due to having a configuration in which the cells inside the foam are independent from each other, as aforementioned. Thus, if closed cell foam is used for the water stopping sheet  30 , a large force is required when squeezing the water stopping sheet of closed cell foam wrapped around the wire harness W between the first divided part  21  and the second divided part  22 , at the time of assembling the separate component  16  to the main body part  15  in the attachment direction D. 
     The operation of the present embodiment will now be described. 
     When assembling the wire harness W to the electrical connection box  10 , first, the portion of the wire harness W wrapped in the water stopping sheet  30  is disposed in the first divided part  21  of the main body part  15 . Then, the separate component  16  is attached to the attachment recessed part  17  of the main body part  15  by being slid in the attachment direction D. At this time, the water stopping sheet  30  wrapped around the wire harness W is sandwiched between the first divided part  21  of the main body part  15  and the second divided part  22  of the separate component  16  along the attachment direction D. The water stopping sheet  30  is thereby compressed in the thickness direction of the water stopping sheet  30  by the inner circumferential surface of the harness insertion channel  14  (inner circumferential surface of first divided part  21  and inner circumferential surface of second divided part  22 ) and the wire harness W (more specifically, exterior member X on outer circumference of wire harness W). Also, at this time, the locking raised part  24  of the first divided part  21  and the locking raised part  25  of the second divided part  22  are located on the outer side of the electrical connection box  10  relative to the water stopping sheet  30 , and fit into the annular recessed part Xb of the exterior member X. 
     As aforementioned, the water stopping sheet  30  has the overlapping part  30   a  at the wrapping end part, and thus the thickness (lamination thickness) of the water stopping sheet  30  is not uniform in the circumferential direction. Here, a comparative configuration that differs from the present embodiment, that is, a comparative configuration in which the inner diameter of the harness insertion channel  14  is uniform in the length direction of the harness insertion channel  14 , will be considered. In this comparative configuration, when the inner diameter of the harness insertion channel  14  is adjusted to the outer diameter of the overlapping part  30   a  of the water stopping sheet  30 , the portion other than overlapping part  30   a  of the water stopping sheet  30  (in the drawings, non-overlapping part  30   b ) will be difficult to compress to a water stopping state. On the other hand, when the inner diameter of the harness insertion channel  14  is adjusted to the outer diameter of the non-overlapping part  30   b  of the water stopping sheet  30 , a large force will be needed to squeeze the overlapping part  30   a,  and assemblability of the separate component  16  deteriorates. Thus, with this comparative configuration, it is difficult to set the inner diameter of the harness insertion channel  14 . 
     In that respect, the sloped surface  23  sloping relative to the central axis L of the harness insertion channel  14  is formed on the inner circumferential surface of the harness insertion channel  14  of the present embodiment. Also, the inner diameter of a minimum diameter portion  23   a  (in the present embodiment, portion on box inner side of locking raised parts  24  and  25 ) of the portion of the sloped surface  23  that compresses the water stopping sheet  30  is set smaller than the outer diameter of the non-overlapping part  30   b  of the water stopping sheet  30 . The sloped surface  23  thereby widens radially toward the inner side end part  14   a  of the harness insertion channel  14 , while compressing the non-overlapping part  30   b  and the overlapping part  30   a  of the water stopping sheet  30  to a water stopping state with the minimum diameter portion  23   a  of the sloped surface  23 , thus allowing the force needed to squeeze the water stopping sheet  30  to be relaxed. That is, at a maximum diameter portion  23   b  (in the present embodiment, portion of sloped surface  23  at inner side end part  14   a  of harness insertion channel  14 ) of the portion of the sloped surface  23  that compresses the water stopping sheet  30 , the non-overlapping part  30   b  of the water stopping sheet  30  does not need to be compressed to a water stopping state. Note that, in the present embodiment, the inner diameter of the minimum diameter portion  23   a  of the sloped surface  23  is set such that the compression ratio at which the non-overlapping part  30   b  is compressed by the minimum diameter portion  23   a  of the sloped surface  23  will be greater than or equal to the value at which the water stopping state of the water stopping sheet  30  can be ensured (35% or more in the case of the aforementioned Everlight Moran). The sloped surface  23  of the harness insertion channel  14  is an example of a pressing surface that presses the water stopping sheet  30 . 
     The effects of the present embodiment will now be described. 
     (1) The water stopping sheet  30  is characterized by having higher water stopping capability due to being compressed than when not compressed, and the water stopping sheet  30  is rendered into a water stopping state due to being compressed by the inner circumferential surface of the harness insertion channel  14  and the outer circumferential surface of the wire harness W. Water stopping capability in the harness insertion channel  14  can thereby be ensured by the water stopping sheet  30  that is compressed to a water stopping state by the inner circumferential surface of the harness insertion channel  14  and the outer circumferential surface of the wire harness W. 
     (2) The water stopping sheet  30  is semi-closed cell foam. Since semi-closed cell foam is readily deformable compared with closed cell foam, it becomes possible to relax the force needed to squeeze the water stopping sheet  30  between the first divided part  21  and the second divided part  22 , and, as a result, it becomes possible to inhibit deterioration of the assembly workability of the separate component  16 . 
     (3) The harness insertion channel  14  has a structure divided into the first divided part  21  and the second divided part  22  in the circumferential direction. Also, the inner circumferential surface of the harness insertion channel  14  is provided with the sloped surface  23  sloping relative to the central axis L of the harness insertion channel  14 . It is thereby possible to apply sufficient pressure to the non-overlapping part  30   b  of the water stopping sheet  30  to ensure the water stopping capability, while keeping the force needed to assemble the first divided part  21  and the second divided part  22  to the portion of the wire harness W wrapped in the water stopping sheet  30  to a small force. 
     (4) At the wrapping end part of the water stopping sheet  30 , there is the overlapping part  30   a  in which the number of laminations of the water stopping sheet  30  is greater than at other portions in the circumferential direction. According to this configuration, the thickness (lamination thickness) of the water stopping sheet  30  is not uniform in the circumferential direction, but even in such a case, it is possible to prevent the occurrence of portions where the water stopping sheet  30  is not compressed to a water stopping state, by providing the sloped surface  23  on the inner circumferential surface of the harness insertion channel  14 . 
     (5) The harness insertion channel  14  is formed to extend on the outer side of the box-like main body part  15  from the outer surface of this main body part  15 , and the sloped surface  23  is formed to extend from the inner side end part  14   a  of the harness insertion channel  14  to the outer side end part  14   b  of the harness insertion channel  14 . The sloped surface  23  can thereby be constituted to have a gentle slope angle, and, as a result, it becomes possible to favorably apply pressure to the water stopping sheet  30 . 
     (6) The sloped surface  23  slopes so as to approach the central axis L of the harness insertion channel  14  toward the outer side end part  14   b  of the harness insertion channel  14 . According to this mode, the thickness of the outer side end part  14   b  of the harness insertion channel  14  can be ensured, and, hence, the rigidity of the outer side end part  14   b  of the harness insertion channel  14  can be ensured. 
     The present embodiment can be carried out by making changes such as the following. The present embodiment and the following example changes can be carried out in combination with each other as long as there are no technical inconsistencies. 
     The sloped surface  23  of the above embodiment narrows radially toward the outer side of the harness insertion channel  14 , but may be formed to widen radially toward the outer side of the harness insertion channel  14 . 
     The sloped surface  23  of the above embodiment is formed along the entire length of the harness insertion channel  14 , that is, from the inner side end part  14   a  to the outer side end part  14   b,  but is not limited thereto, and a sloped surface may be formed along part of the length of the harness insertion channel  14 . 
     In the above embodiment, the material of the water stopping sheet  30  is given as semi-closed cell foam, but is not particularly limited thereto, and a material other than semi-closed cell foam can also be employed as long as the material is characterized by having higher water stopping capability due to being compressed than when not compressed. 
     The harness insertion channel  14  of the above embodiment is formed to extend on the outer side of the box-like main body part  15  from the outer surface of this main body part  15 , but is not particularly limited thereto, and may be constituted to not extend on the outer side from the outer surface of the main body part  15 . 
     The technical concepts that can be grasped from the above embodiment and example changes will now be recited. 
     (1) An electrical connection box in which the sloped surface slopes so as to approach the central axis of the harness insertion channel toward the outer side of the harness insertion channel. 
     According to this mode, the thickness of the outer side end part of the harness insertion channel can be ensured, and, hence, the rigidity of the outer side end part of the harness insertion channel can be ensured. 
     (2) The electrical connection box in which the sloped surface is formed at a portion where the wire harness wrapped in the water stopping sheet is sandwiched by the first divided part and the second divided part. 
     According to this mode, it becomes possible to favorably apply pressure to the water stopping sheet. 
     (3) The wire harness (W) includes an exterior member (X) having a bellows structure in which an annular raised part (Xa) and an annular recessed part (Xb) are connected alternately along the length direction, the outer circumferential surface of the wire harness (W) is the outer circumferential surface of the exterior member (X), and the harness insertion channel ( 14 ) is provided with a locking raised part ( 24 ,  25 ) that protrudes on the inner circumference side from the inner circumferential surface of the harness insertion channel ( 14 ), and fits into the annular recessed part of the exterior member (X). 
     (4) The locking raised part ( 24 ,  25 ) of the harness insertion channel has a radially inward-facing end face constituted to correspond to, conform to or surface contact the outer circumferential surface of the annular recessed part (Xb) of the exterior member (X). 
     (5) The outer circumferential surface of the annular recessed part (Xb) of the exterior member (X) is a convex curved surface, and the radially inward-facing end face of the locking raised part ( 24 ,  25 ) is a concave curved surface. 
     (6) The wire harness (W) includes aluminum or aluminum alloy wires that are to be connected to a different type of metal than aluminum. 
     (7) The harness insertion channel ( 14 ) can have a long groove constituted to receive the wire harness (W) from a radial direction of the wire harness (W) that intersects or is orthogonal to the longitudinal direction of the wire harness (W). 
     (8) The long groove of the harness insertion channel ( 14 ) can include a pressing surface ( 23 ) constituted to contact the outer circumferential surface of the water stopping sheet ( 30 ) around the entire circumference, and press the entire circumference of the water stopping sheet ( 30 ) in the thickness direction of the water stopping sheet ( 30 ). 
     (9) The water stopping sheet ( 30 ) may be an elastic water stopping roll that is wrapped around the outer circumferential surface of the wire harness (W), and has a first sheet edge, a second sheet edge, and an overlapping part ( 30   a ) of a first length that extends from the first sheet edge to the second sheet edge, and the pressing surface ( 23 ) of the harness insertion channel ( 14 ) has a second length that is shorter than the first length. 
     (10) The water stopping sheet ( 30 ) has a constant thickness in a non-compressed state or in a natural state before being wrapped around the outer circumferential surface of the wire harness (W). 
     (11) The overlapping part ( 30 a) of the water stopping sheet ( 30 ) pressed by the pressing surface ( 23 ) of the harness insertion channel ( 14 ) has a first thickness at the first sheet edge, and has a second thickness at the second sheet edge, with the first thickness being smaller than the second thickness. 
     (12) The locking raised part ( 24 ,  25 ) is constituted to contact the first sheet edge of the water stopping sheet ( 30 ) in the length direction. 
     LIST OF REFERENCE NUMERALS 
     D Attachment direction 
     L Central axis 
     W Wire harness 
     X Exterior member 
     Xa Annular raised part 
     Xb Annular recessed part 
       10  Electrical connection box 
       12  Electrical component 
       13  Cover 
       14  Harness insertion channel 
       14   a  Inner side end part 
       14   b  Outer side end part 
       15  Main body part 
       15   a  Outer wall 
       16  Separate component 
       17  Attachment recessed part 
       21  First divided part 
       22  Second divided part 
       23  Sloped surface 
       23   a  Minimum diameter portion 
       23   b  Maximum diameter portion 
       24  Locking raised part 
       25  Locking raised part 
       30  Water stopping sheet 
       30   a  Overlapping part 
       30   b  Non-overlapping part