Wiper device, in particular for motor vehicle, having wiper lip fastened by means of end piece

Abstract

The invention relates to a wiper device (1), in particular for a motor vehicle, having at least one retaining device (2, 3) and a wiper lip (4). According to the invention, a fixed end part (9) is fastened to at least one end (8) of the retaining device (2, 3), a detachable end part (10) is provided, which can be inserted to the fixed end part (9) at the end (8) along a longitudinal extension (11), and the wiper lip (4) can be pushed into the retaining device (2, 3) along the longitudinal extension (11), when the detachable end part (10) is inserted into the fixed end part (9), the wiper lip (4) is fastened in the retaining device (2, 3).

Description

Field of the Invention

[0001] The present invention relates to a wiper device, in particular for motor vehicles. The present invention particularly relates to the fields of passenger cars (Personenkraftwagen, PKW) and trucks (Lastkraftwagen, LKW). Background Art

[0002] A flat glass wiper is known from DE 102004058511 A1. The known glass wiper has a wiper blade without a carrier. Summary of the Invention

[0003] The wiper device according to the invention having the features of the independent claims has the advantage that an improved design and mode of operation can be achieved. Here, it is possible to more easily construct the wiper device and / or more easily replace the wiper lip and / or improve the fastening of the wiper lip.

[0004] Furthermore, advantageous improvements and refinements of the features specified in the independent claims are obtained by the measures listed in the dependent claims.

[0005] Advantageously, when the detachable end part is plugged onto the fixed end part, the detachable end part is held at the fixed end part by frictional engagement. By frictional engagement, the following design can be achieved, in which the user can replace the wiper lip without tools.

[0006] Advantageously, when the detachable end part is plugged onto the fixed end part, the end side of the fixed end part faces the end side of the detachable end part. Thus, the following design is feasible, in which the detachable end part is not inserted into the fixed end part. The connection between the detachable end part and the fixed end part can be achieved by a plug-in connection between the detachable end part and the fixed end part.

[0007] Advantageously, the detachable end part can be releasably connected to the fixed end part by at least one connection pair having a sleeve and a bolt that can be introduced into the sleeve along a longitudinal extension, wherein when the detachable end part is plugged onto the fixed end part, the bolt is plugged into the sleeve. Thereby, an advantageous design of the plug-in connection can be achieved. Preferably, two such connection pairs each having a sleeve and a bolt are provided. The relevant end part can be designed as a plug by means of the bolt.

[0008] Advantageously, a bolt is provided at the fixed end part and / or the bolt extends along the longitudinal extension and / or a sleeve is provided at the detachable end part. Thereby, there is a greater structural freedom in the design of the fixed end part. In particular, a connection to at least one backsheet, in particular two backsheets, can be achieved at the fixed end part, and at the same time a short design of the fixed end part along the longitudinal extension can be achieved.

[0009] Advantageously, the detachable end part can be releasably connected to the fixed end part by means of at least one further connection pair having a sleeve and a bolt that can be inserted into the sleeve along the longitudinal extension, wherein when the detachable end part is plugged onto the fixed end part, the bolt of the further connection pair is inserted into the sleeve of the further connection pair. Thus, the fixed end part can be advantageously configured as a plug.

[0010] Advantageously, the fixed end part has a receiving profile and the detachable end part has a receiving profile which, when the detachable end part is plugged onto the fixed end part, couples with the receiving profile of the fixed end part, and when the detachable end part is plugged onto the fixed end part, the wiper lip extends through the receiving profile of the fixed end part and at least partially into the receiving profile of the detachable end part or through the detachable end part. Thus, an advantageous fastening of the wiper lip can be achieved. A design can be achieved in which the wiper lip extends at least approximately over the entire longitudinal extension of at least one holding device including the end part and optionally a further end cap, i.e. from one end to the other end.

[0011] Advantageously, the receiving profile of the fixed end part and the receiving profile of the detachable end part are designed such that the wiper lip is supported at the fixed end part and the detachable end part at least substantially over the entire longitudinal extension of the wiper lip in at least one direction oriented perpendicular to the longitudinal extension, preferably in each direction oriented perpendicular to the longitudinal extension and / or in at least one rotational direction around the longitudinal extension, preferably in two rotational directions around the longitudinal extension, by the receiving profile of the fixed end part and the receiving profile of the detachable end part. Thus, the wiper lip can be advantageously pressed against the glass, in particular the windscreen of a motor vehicle.

[0012] Advantageously, a projection is designed at the detachable end part which engages into a recess provided at the wiper lip. Thereby, a form-fitting connection can be achieved between the detachable end part and the wiper lip. A releasable connection can be achieved between the wiper lip and the end part which enables the detachable end part to be easily reused when the wiper lip is replaced.

[0013] Advantageously, the detachable end part forms a stop for the wiper lip at the following end side, which end side points outwards along the longitudinal extension at the end. Thereby, the movement stroke of the inserted wiper lip can be defined. If the wiper lip is already stopped in other ways, this can be regarded as an additional measure for stopping.

[0014] Advantageously, at least one backing piece is provided, which is connected to the fixed end part by means of a preferably non-loosening snap connection. Thereby, easy assembly of the wiper device can be achieved.

[0015] Advantageously, the fixed end part has a snap projection provided in the fastening receiving part of the fixed end part, and the snap projection has a guiding slope, which can enable the fastening end of the backing piece to be introduced into the fastening receiving part of the fixed end part. The fastening end of the backing piece has an oblong hole, and when the fastening end of the backing piece is introduced into the fastening receiving part of the end part, the snap projection of the fixed end part is inserted into the oblong hole of the fastening end of the backing piece. This can achieve assembly and connection in one assembly step.

[0016] Advantageously, at least one additional backing piece is provided, which is connected to the fixed end part by means of a preferably non-loosening snap connection. In particular, a design with two backing pieces can be achieved. This can achieve a design in which the backing pieces are assembled relative to the two sides of the wiper lip. This can achieve structural advantages for the structure of the wiper device, especially for the arrangement of the bolts for the plug connection at the fixed end part. Advantageous support for the wiper lip can be achieved in terms of structure.

[0017] Advantageously, the fixed end part has an additional snap projection provided in the additional fastening receiving part of the fixed end part, and the additional snap projection has a guiding slope, which can enable the fastening end of the additional backing piece to be introduced into the additional fastening receiving part of the fixed end part. The fastening end of the additional backing piece has an oblong hole, and when the fastening end of the additional backing piece is introduced into the additional fastening receiving part of the fixed end part, the additional snap projection of the fixed end part is inserted into the oblong hole of the fastening end of the additional backing piece. Therefore, advantageous assembly can be achieved. In particular, the required number of different components can be optimized.

[0018] According to the design, one or more of the following features and advantages can be achieved.

[0019] A wiper device with a wiper lip that can be replaced by the user can be achieved. The end part can perform the function of an end cap. Here, an arrangement with exactly two end parts can be achieved at the end of the wiper device, in which the inner end part is fixed and the outer end part is detachable.

[0020] The fixed end part can be connected to at least one backing piece. Thereby, in particular, a design of the wiper device as a flat-buckle wiper (Flachbügelwischer) can be achieved, which can be adjusted relative to the glass by a swinging wiper arm during a swinging movement.

[0021] The fixed end part can enable the connection to the wiper lip in order to hold the wiper lip.

[0022] In a preferred design, there are two backing pieces arranged parallel to each other side by side along the longitudinal extension. The fixed end part can be connected to the backing piece at the outer end of the backing piece as observed along the longitudinal extension. Then, the detachable end part can be releasably connected to the fixed end part from the outside.

[0023] The detachable end part can have a tool for holding the wiper lip. Here, a releasable fastening of the wiper lip at the detachable end part can be achieved. The holding of the wiper lip can be realized by a receiving profile serving as a guide part, a receiving profile of the fixed end part that extends the guide part, and a receiving profile of the detachable end part that further extends the guide part.

[0024] Preferably, the wiper lip can be removed from the detachable end part in an easy manner and preferably without residue. Thereby, the wiper lip can be easily replaced. The detachable end part can be reused when replacing the wiper lip.

[0025] Advantageously, a tool for mutual connection is provided between the fixed end part and the detachable end part. Preferably, the connection is constructed rigidly or stiffly. In particular, the connection can be achieved by protrusions at the fixed end part and / or at the detachable end part. Such protrusions can be constructed as bolts. In principle, only one protrusion, in particular only one bolt, can also be provided. Preferably, two protrusions, in particular two bolts, are provided.

[0026] The wiper lip can be supported in the assembled state within at least substantially its entire longitudinal extension. Here, in a preferred design, the support is achieved by at least one backing piece, in particular two backing pieces, the fixed end part, and the detachable end part. Thereby, a favorable pressing pressure onto the glass, in particular the windshield, can be achieved, which can effect sealing during the wiping movement and thus can achieve an improved wiping effect within at least approximately the entire longitudinal extension of the wiper device.

[0027] The fixed end part can be non-releasably connected to at least one backing piece. The fixed end part can be connected to the backing piece, for example, by a snap connection or the like. Description of the Drawings

[0028] Preferred embodiments of the present invention are explained in more detail below with reference to the drawings, in which corresponding elements are provided with consistent reference numerals. Among them:

[0029] Figure 1 A wiper device, in particular for a motor vehicle, is shown in a schematic spatial view according to an embodiment. The wiper device has a holding device and a wiper lip;

[0030] Figure 2 The wiper device shown in is shown from the line-of-sight direction indicated by II in a brief, schematic spatial view according to an embodiment, where the holding device is not shown; Figure 1 The wiper device shown in is shown from the line-of-sight direction indicated by II in a brief, schematic spatial view according to an embodiment, where the holding device is not shown;

[0031] Figure 3 The wiper device shown in is shown in a brief, schematic spatial exploded view according to an embodiment, where the holding device is not shown; Figure 2 The wiper device shown in is shown in a brief, schematic spatial exploded view according to an embodiment, where the holding device is not shown;

[0032] Figure 4 The detachable end part and the wiper lip are shown in a brief, schematic spatial view according to an embodiment during the replacement of the wiper lip, where the state before the wiper lip is fastened to the detachable end part is shown;

[0033] Figure 5 Shown is Figure 4 The detachable end part and the wiper lip shown in, where the wiper lip is fastened to the detachable end part;

[0034] Figure 6 The detachable end part and the fixed end part shown in are shown in a schematic spatial cross-sectional view according to an embodiment to explain the feasible releasable connection between the detachable end part and the fixed end part, where the wiper lip is not shown; Figure 4 The detachable end part and the fixed end part shown in are shown in a schematic spatial cross-sectional view according to an embodiment to explain the feasible releasable connection between the detachable end part and the fixed end part, where the wiper lip is not shown;

[0035] Figure 7 The wiper device is shown in a brief, schematic cross-sectional view according to an embodiment, where the support and guidance of the wiper lip are shown;

[0036] Figure 8 The fixed end part and the back plate are shown in a brief, schematic spatial cross-sectional view according to an embodiment, where the assembly of the fixed end part to the back plate is shown; and

[0037] Figure 9 The fixed end part and the back plate shown in are shown in a schematic cross-sectional view in the assembled state; Figure 8 The fixed end part and the back plate shown in. Detailed Description

[0038] Figure 1The wiper device 1 is shown in a schematic spatial view according to an embodiment, having holding devices 2, 3 and a wiper lip 4. The wiper device 1 can be used in particular for motor vehicles. The wiper device has an adapter 5. The holding devices 2, 3 are connected to the adapter 5. At the adapter 5, the wiper device 1 can be connected to a wiper arm (not shown). When the wiper device 1 is actuated by means of such a wiper arm, the wiper lip 4 can be pulled across the glass of a motor vehicle, in particular the windscreen.

[0039] Figure 2 The wiper device 1 shown in [II] is shown in a brief, schematic spatial view according to an embodiment from the line of sight direction indicated by II, Figure 1 wherein the holding device 2 is not shown. In addition, Figure 3 The wiper device 1 shown in [II] is shown in a brief, schematic spatial exploded view according to an embodiment, Figure 2 wherein the holding device 2 is not shown.

[0040] The wiper device 1 has back pieces 6, 7 which can be arranged at least in sections in the holding devices 2, 3 in the assembled state of the wiper device 1.

[0041] As is also Figure 1 apparent, a fixed end piece 9 is fastened at the end 8 at the holding device 2. The fastening can be effected by means of the back pieces 6, 7. The fixed end piece 9 is then arranged in a position-fixed manner with respect to the holding device 2.

[0042] In addition, a detachable end piece 10 is provided. The detachable end piece 10 can be plugged onto the fixed end piece 9 at the end 8 along a longitudinal extension 11. For assembly, the wiper lip 4 can be pushed into the holding devices 2, 3 along the longitudinal extension 11. The wiper lip 4 can be connected to the detachable end piece 10. Thereby, when, for example, the wiper lip 4 is to be replaced, the wiper lip 4 can be pulled off at the detachable end piece 10.

[0043] In the assembled state, the wiper lip 4 is fastened in the holding devices 2, 3. Here, the detachable end piece 10 is plugged onto the fixed end piece 9, as is also Figure 6 described. In addition, an end cap 12 can be provided at the end 8' opposite the end 8. The design can also be effected in an interchangeable manner with respect to the arrangement of the ends 8, 8'.

[0044] In the assembled state, the detachable end part 10 is preferably held at the fixed end part 9 by frictional locking. For this purpose, the detachable end part 10 can be plugged onto the fixed end part 9 against a certain resistance. The fixed end part 9 and the detachable end part 10 are preferably not plugged into each other at their maximum outer cross-section. This means that when the detachable end part 10 is plugged onto the fixed end part 9, the end side 13 of the fixed end part 9 faces the end side 14 of the detachable end part 10.

[0045] Figure 4 The detachable end part 10 and the wiper lip 4 are shown in a simplified, schematic spatial illustration according to an embodiment during the replacement of the wiper lip 4, where the state before the wiper lip 4 is fastened to the detachable end part 10 is shown.

[0046] Furthermore, Figure 5 is shown Figure 4 the detachable end part 10 and the wiper lip 4 shown in, where the wiper lip 4 is fastened to the detachable end part 10.

[0047] The fixed end part 9 has a receiving contour 17. Correspondingly, the detachable end part 10 has a receiving contour 18. When the detachable end part 10 is plugged onto the fixed end part 9, the receiving contour 18 is coupled to the receiving contour 17 of the fixed end part 9.

[0048] In the present embodiment, the wiper lip 4 extends through the receiving contour 17 of the fixed end part 9 and partially into the receiving contour 18 of the detachable end part 10. In a modified design, when the detachable end part 10 is plugged onto the fixed end part 9, the wiper lip 4 can also extend completely through the detachable end part 10 and, if necessary, also protrude slightly from the detachable end part 10.

[0049] A projection 20 is designed at the detachable end part 10, which engages into a recess 21 provided at the wiper lip 4. In the present embodiment, the detachable end part 10 is constructed with a stop 22 for the wiper lip 4 at the following end side 15, which points outwards along the longitudinal extension 11 at the end 8. In the present embodiment, the stop 22 is formed by a stop tab 23 at the detachable end part 10.

[0050] In the assembled state, the head strip 33 of the wiper lip 4 is on the side of the stop tab 23, i.e., above the stop tab 23 in the illustration, and the part 34 arranged closer to the glass during operation is on the other side of the stop tab 23, i.e., below the stop tab 23 in the illustration. Thereby, the wiper lip 4 is stopped and, if necessary, held along the longitudinal extension 11 by the stop 22.

[0051] Figure 6A schematic spatial cross-sectional view is shown according to an embodiment. Figure 4 A detachable end piece 10 and a fixed end piece 9 are shown in order to explain a possible detachable connection between the detachable end piece 10 and the fixed end piece 9 , wherein the wiper lip 4 is not shown to simplify the illustration.

[0052] The removable end piece 10 can be releasably connected to the fixed end piece 9 by means of at least one connection pair 25 having a sleeve 26 and a screw 27 which can be introduced into the sleeve 26 along the longitudinal extension 11, as indicated by the arrow 28. In the connected state, the screw 27 is inserted into the sleeve 26. The removable end piece 10 is then plugged onto the fixed end piece 9.

[0053] In the present embodiment, the bolt 27 is arranged on the fixed end part 9. Correspondingly, the sleeve 26 is arranged on the detachable end part 10. In a modified embodiment, the bolt 27 can also be arranged on the detachable end part 10, while the sleeve 26 is arranged on the fixed end part 9. The bolt 27 extends along the longitudinal extension 11, so that the wiper lip 4 can be advantageously introduced into the holding device 2, 3.

[0054] The removable end part 10 can be releasably connected to the fixed end part 9 by means of a further connection pair 30 having a sleeve 31 and a bolt 32 which can be introduced into the sleeve 31 along the longitudinal extension 11. The bolt 32 of the further connection pair 30 is then inserted into the sleeve 31 of the further connection pair 30, so that the removable end part 10 is inserted into the fixed end part 9. In the present embodiment, the bolt 32 is also arranged at the fixed end part 9, while the sleeve 31 is arranged at the removable end part 10. However, other designs are also conceivable. In particular, the two bolts 27, 32 do not necessarily have to be arranged at the same end parts 9, 10.

[0055] Figure 7 The windshield wiper device 1 is shown in a simplified schematic sectional illustration according to an exemplary embodiment, wherein the support and guidance of the wiper lip 4 is illustrated.

[0056] The receiving contour 17 of the fixed end part 9 and the receiving contour 18 of the detachable end part 10 are designed in such a way that an optimized support of the wiper lip 4 can be achieved. Advantageously, the wiper lip 4 is supported at least substantially over its entire longitudinal extension 11 at the fixed end part 9 and at the detachable end part 10. The support is provided in one or more directions, wherein directions 35, 36, 37, 38 oriented perpendicularly to the longitudinal extension 11 are shown by way of example. Preferably, the support is provided in each direction 35, 36, 37, 38 oriented perpendicularly to the longitudinal extension 11, so that the support can be achieved perpendicularly to the longitudinal extension 11 through 360°.

[0057] Furthermore, support can be achieved with respect to at least one rotational direction 39, 40 around the longitudinal extension 11. Preferably, support is achieved along two rotational directions 39, 40 around the longitudinal extension 11. The support along at least one rotational direction 39, 40 can be achieved by the receiving contour 17 of the fixed end part 9 and / or the receiving contour 18 of the detachable end part 10.

[0058] Figure 8 The fixed end part 9 and the backsheet 6 are shown in a brief, schematic spatial cross-sectional view according to an embodiment, wherein the assembly of the fixed end part 9 to the backsheet 6 is shown. Furthermore, Figure 9 is shown in a schematic cross-sectional view in the assembled state Figure 8 the fixed end part 9 and the backsheet 6 shown therein.

[0059] The backsheet 6 and, correspondingly, the backsheet 7 can each be connected to the fixed end part 9 by means of a non-loosenable snap connection 45.

[0060] The fixed end part 9 has a fastening receiving part 46. In the fastening receiving part 46, a snap projection 47 is formed at the fixed end part 9. When the backsheet 6 is inserted into the fastening receiving part 46 of the fixed end part 9, the snap projection 47 snaps onto the fastening end 48 of the backsheet. Here, a guiding ramp 49 is formed at the snap projection 47, which simplifies the insertion.

[0061] In the present embodiment, the fastening end 48 of the backsheet 6 has an oblong hole 50, and the snap projection 47 of the fixed end part 9 snaps into this oblong hole during insertion. The snap projection 47 is then inserted into the oblong hole 50 of the fastening end 48 of the backsheet 6 in the assembled state.

[0062] Furthermore, in the present embodiment, an additional backsheet 7 is provided, which can correspondingly be connected to the fixed end part 9 by means of a non-loosenable snap connection 51. Here, since corresponding views are obtained, these elements are also marked in the Figure 9 cross-sectional view.

[0063] The fixed end part 9 has an additional fastening receiving part 52, in which an additional snap projection 53 is provided. The additional snap projection 53 also has a guiding ramp 55 for facilitating the insertion of the fastening end 54 of the additional backsheet 7. The fastening end 54 of the additional backsheet 7 also has an oblong hole 56, and when the fastening end 54 of the additional backsheet 7 is inserted into the additional fastening receiving part 52 of the fixed end part 9, the additional snap projection 53 of the fixed end part 9 is inserted into this oblong hole.

[0064] The invention is not limited to the described embodiments.

Claims

1. A windshield wiper device (1), in particular for a motor vehicle, comprising at least one retaining device (2, 3) and a wiper lip (4), It is characterized in that A fixed end part (9) is fastened to at least one end (8) of the retaining device (2, 3), and a detachable end part (10) is provided, which can be plugged into the fixed end part (9) along a longitudinal extension (11) at the end (8); the wiper lip (4) can be pushed into the retaining device (2, 3) along the longitudinal extension (11), and when the detachable end part (10) is plugged into the fixed end part (9), the wiper lip (4) is fastened in the retaining device (2, 3).

2. The windshield wiper device according to claim 1, It is characterized in that a) when the removable end piece (10) is plugged into the fixed end piece (9), the removable end piece (10) is held on the fixed end piece (9) by friction locking, and / or b) When the detachable end part (10) is plugged into the fixed end part (9), the end side (13) of the fixed end part (9) faces the end side (14) of the detachable end part (10).

3. The windshield wiper device according to claim 1 or 2, It is characterized in that The removable end part (10) can be releasably connected to the fixed end part (9) by means of at least one connection pair (25) having a sleeve (26) and a screw (27) which can be introduced into the sleeve (26) along the longitudinal extension (11), wherein the screw (27) is inserted into the sleeve (26) when the removable end part (10) is inserted into the fixed end part (9).

4. The windshield wiper device according to claim 3, It is characterized in that The bolt (27) is arranged at the fixed end piece (9) and / or the bolt (27) extends along the longitudinal extension (11), and / or the sleeve (26) is arranged at the removable end piece (10).

5. The windshield wiper device according to claim 4, It is characterized in that The removable end part (10) can be releasably connected to the fixed end part (9) by means of at least one further connection pair (30) having a sleeve (31) and a bolt (32) which can be introduced into the sleeve (31) along the longitudinal extension (11), wherein when the removable end part (10) is plugged into the fixed end part (9), the bolt (32) of the further connection pair (30) is plugged into the sleeve (31) of the further connection pair (30).

6. The windshield wiper device according to any one of claims 1 to 5, It is characterized in that The fixed end part (9) has a receiving contour (17), and the removable end part (10) has a receiving contour (18). When the removable end part (10) is plugged into the fixed end part (9), the receiving contour is connected to the receiving contour (17) of the fixed end part (9), and when the removable end part (10) is plugged into the fixed end part (9), the wiper lip (4) extends through the receiving contour (17) of the fixed end part (9) and at least partially extends into the receiving contour (18) of the removable end part (10) or extends through the removable end part (10).

7. The windshield wiper device according to claim 6, It is characterized in that The receiving contour (17) of the fixed end part (9) and the receiving contour (18) of the removable end part (10) are designed in such a way that the wiper lip (4) is supported at least substantially over the entire longitudinal extension (11) of the wiper lip (4) at the fixed end part (9) and the removable end part (10) in at least one direction (35, 36, 37, 38) oriented perpendicularly to the longitudinal extension (11), preferably in each direction (35, 36, 37, 38) oriented perpendicularly to the longitudinal extension (11), and / or in at least one rotational direction (39, 40) about the longitudinal extension (11), preferably in both rotational directions (39, 40) about the longitudinal extension (11).

8. The windshield wiper device according to any one of claims 1 to 7, It is characterized in that a) a projection (20) is provided on the detachable end part (10), the projection being engaged in a recess (21) provided on the wiper lip (4), and / or b) The detachable end piece (10) forms a stop (22) for the wiper lip (4) at an end side (15) which points outwards along the longitudinal extension (11) at the end (8).

9. The windshield wiper device according to any one of claims 1 to 8, It is characterized in that At least one back piece (6, 7) is provided, which is connected to the fixed end piece (9) by means of a preferably non-detachable hook-and-loop connection (45).

10. The windshield wiper device according to claim 9, It is characterized in that a) the fixed end part (9) has a buckle protrusion (47) arranged in the fastening receiving part (46) of the fixed end part (9), and the buckle protrusion has an introduction inclined part (49), which can realize the introduction of the fastening end (48) of the back sheet (6) into the fastening receiving part (46) of the fixed end part (9), the fastening end (48) of the back sheet (6) has a long hole (50), and when the fastening end (48) of the back sheet (6) is introduced into the fastening receiving part (46) of the end part (9), the buckle protrusion (47) of the fixed end part (9) is embedded in the long hole (50) of the fastening end (48) of the back sheet (6), and / or b1) at least one further back sheet (7) is provided, which is connected to the fixed end piece (9) by means of a preferably non-releasable hook-and-loop connection (51), and / or b2) The fixed end part (9) has an additional hook-and-loop protrusion (53) arranged in the additional fastening receiving part (52) of the fixed end part (9), and the additional hook-and-loop protrusion has an introduction inclined portion (55), which can enable the fastening end (54) of the additional back piece (7) to be introduced into the additional fastening receiving part (52) of the fixed end part (9), and the fastening end (54) of the additional back piece (7) has a long hole (56), and when the fastening end (54) of the additional back piece (7) is introduced into the additional fastening receiving part (52) of the fixed end part (9), the additional hook-and-loop protrusion (53) of the fixed end part (9) is embedded in the long hole (56) of the fastening end (54) of the additional back piece (7).

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