Joint structure of a squeegee arm

Abstract

Provided is a connecting structure of a squeegee arm that improves the workability of disassembling and assembling a squeegee blade. The connecting structure of the squeegee arm includes a connecting shaft portion provided on the squeegee arm, and a clasp portion provided on the squeegee blade. The clasp portion includes a pair of claw portions that constitute a groove portion capable of engaging with the connecting shaft portion, and a slit portion constituted by mutually facing inner walls is provided on both sides of the pair of claw portions in the longitudinal direction of the squeegee blade. A protrusion portion that protrudes toward the inside of the slit portion is provided on each of the inner walls, and the protrusion portions are arranged offset from each other in the direction along the axial direction of the connecting shaft portion.

Description

Technical Field

[0001] This invention relates to a connection structure for a scraper arm. Background Technology

[0002] A brush wiper device is installed on vehicles such as automobiles. The brush wiper device includes: a brush wiper motor as a drive source, a brush wiper arm that oscillates under the drive of the brush wiper motor, and a brush wiper blade mounted on the front end of the brush wiper arm. The brush wiper arm and the brush wiper blade are connected, for example, by a connection structure described in Patent Document 1. In the connection structure described in Patent Document 1, the brush wiper arm and the brush wiper blade are connected by engaging a mounting groove provided on the brush wiper arm with a connecting shaft provided on the brush wiper blade.

[0003] [Existing technical documents]

[0004] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2015-44501 Summary of the Invention

[0006] [The problem the invention aims to solve]

[0007] In the connection structure between the brush arm and the brush blade described in Patent Document 1, the width relationship between the connecting shaft and the mounting groove (groove inlet) is changed when the brush blade is in a disassembly / reassembly position and when it is not in a disassembly / reassembly position. This allows for the disassembly / reassembly and fixation of the brush blade relative to the brush arm.

[0008] However, the position of the brush blade needs to be set so that it changes significantly between the rotating and disassembly positions, preventing it from slipping off the brush arm even with slight rotation during the brushing motion. Specifically, the width of the mounting groove needs to be set smaller than the diameter of the connecting shaft in the rotating position, and larger than the diameter of the connecting shaft in the disassembly position. This results in a narrow range of rotation angles for the brush blade when the mounting groove is wider than the diameter of the connecting shaft. In other words, the range of rotation angles for the brush blade in the disassembly position is narrow. Therefore, the brush blade must rotate significantly during disassembly and assembly, requiring ample space and resulting in poor workability.

[0009] The purpose of this invention is to provide a connection structure for a scraper arm that improves the workability of assembling and disassembling the scraper blade.

[0010] [Technical means to solve the problem]

[0011] One embodiment of the present invention is a connecting structure for a scraper arm, comprising: a scraper arm; a scraper blade connected to the scraper arm; a first connecting portion disposed on the scraper arm; and a second connecting portion disposed on the scraper blade and connected to the first connecting portion, wherein either the first connecting portion or the second connecting portion is a connecting shaft extending along the width direction of the scraper arm, and either the first connecting portion or the second connecting portion includes a pair of claw portions forming a groove capable of engaging with the connecting shaft portion. The pair of claws are flexible and can bend in the direction of widening the opening width of the groove. Slits formed by opposing inner walls are provided on both sides of the pair of claws in the direction along the long side of the scraper blade. A first protrusion protruding into the slit is provided on one of the opposing inner walls, and a second protrusion protruding into the slit is provided on the other of the opposing inner walls. The first protrusion and the second protrusion are staggered from each other in the direction along the axial direction of the connecting shaft.

[0012] [The effects of the invention]

[0013] According to the present invention, the workability of assembling and disassembling the scraper blades can be improved in the connection structure of the scraper arm. Attached Figure Description

[0014] Figure 1 This is a perspective view showing the connection structure of the scraper arm of the present invention.

[0015] Figure 2 It means Figure 1 A partially enlarged cross-sectional view showing the detailed structure of the connecting part in the connecting structure of the brush arm shown.

[0016] Figure 3 It is along Figure 2 The cross-sectional view of the connecting shaft section shown is an axial cut.

[0017] Figure 4 It means Figure 2 A partially enlarged cross-sectional view of the structure of the connection part on the side of the scraper arm.

[0018] Figure 5 It means Figure 2 An enlarged perspective view of the structure of the connecting part on the scraper blade side shown.

[0019] Figure 6 It means to Figure 5 A partially enlarged view of the structure showing the connection part assembled onto the scraper blade.

[0020] Figure 7 This is an explanation Figure 5 A diagram showing the protrusion direction of the protrusion in the connecting part. Figure 7 (a) is a schematic diagram of the protrusion in the comparative example. Figure 7 (b) is a schematic diagram of the protrusion in this embodiment.

[0021] Figure 8 It means Figure 5 A schematic diagram showing the relationship between the gaps of the protrusions in the connecting part.

[0022] Figure 9 This is a partial cross-sectional view showing the state of preventing misassembly of the scraper blade in the connection structure of the scraper arm of the present invention.

[0023] Figure 10 This is a schematic diagram showing the structure of the protrusion in the first modified example of the connecting part of the present invention.

[0024] Figure 11 This is a schematic diagram showing the structure of the protrusion in the second modified example of the connecting portion of the present invention.

[0025] [Explanation of Symbols]

[0026] 10: Scraper arm

[0027] 10a, 10b: Sidewalls

[0028] 10c: Connecting shaft part (first connecting part)

[0029] 11: Arm Head

[0030] 12: Scraper blade

[0031] 12a: Snap-fit ​​part (second connecting part)

[0032] 12b, 12c: Claws

[0033] 12d: Groove

[0034] 12e, 12f: Slit section

[0035] 12g: Installation section

[0036] 12h, 12i: Inner wall

[0037] 12j: Protrusion (First Protrusion)

[0038] 12k: Protrusion (Second Protrusion)

[0039] 12m: Open end

[0040] 12n, 12p: Wall portion

[0041] 12q: Protrusion

[0042] 12r, 12s: Front end

[0043] 13: Scraper rubber

[0044] 14: Spring Detailed Implementation

[0045] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0046] Figure 1 The connecting structure of the wiper arm 10 shown is, for example, forming a rear wiper device (not shown) for wiping the rear window of a vehicle such as an automobile. The connecting structure of the wiper arm 10 includes: an elongated wiper arm 10; a wiper blade 12 connected to the wiper arm 10; a first connecting portion provided on the wiper arm 10; and a second connecting portion provided on the wiper blade 12 and connected to the first connecting portion. Furthermore, the wiper arm 10 is rotatably supported by an arm head 11.

[0047] Furthermore, the scraper blade 12 is rotatably connected to a portion near the front end of the scraper arm 10 in the long side direction L. On the other hand, an output shaft (not shown) of the scraper motor forming the rear scraper device is fixed to the base end side of the scraper arm 10.

[0048] Furthermore, by turning on the wiper switch located inside the vehicle compartment, the output axis of the wiper motor rotates in both directions, causing the wiper arm 10 to swing. As a result, the wiper blade rubber 13, included in the wiper blade 12, performs a reciprocating wiping motion on the rear window within a predetermined range, thereby wiping away rainwater and other substances adhering to the wiping surface of the rear window.

[0049] The scraper arm 10 is formed into a rod shape by injection molding of a resin material such as plastic, and the front end of the scraper arm 10 is thinner than the base end. More specifically, the scraper arm 10 is formed into a pointed shape that gradually tapers from its base end towards its front end. This improves the design of the scraper arm 10.

[0050] The brush arm 10 and the brush blade 12 are connected via a connecting portion comprising the first connecting portion and the second connecting portion. Specifically, the mounting portion 12g, which supports the second connecting portion constituting the connecting portion, is fixed at a predetermined position in the long side direction L of the brush blade 12 and is located between the brush arm 10 and the brush blade 12. Furthermore, the mounting portion 12g is configured to hold the brush blade 12, which is provided with the blade rubber 13. Moreover, the second connecting portion is rotatably and detachably engaged with the first connecting portion.

[0051] Furthermore, a pressing force is applied to the wiper arm 10 in the direction that tilts the wiper arm 10 toward the rear window, so that the wiper blade 12 will not detach from the wiper arm 10 during the reciprocating wiping motion. Moreover, the pressing force is generated by the elastic force of the tension spring 14 provided at the base end of the wiper arm 10.

[0052] Here, as Figure 3 As shown, the scraper arm 10 includes a pair of sidewalls 10a and 10b facing each other. Furthermore, either the first connecting portion or the second connecting portion is along a path parallel to... Figure 1 The long side L of the scraper blade 12 shown intersects. Figure 3 The illustrated brush arm 10 extends in the width direction M and has a connecting shaft portion 10c that engages with a pair of sidewalls 10a, 10b of the brush arm 10. Furthermore, either the first connecting portion or the second connecting portion includes components capable of engaging with the connecting shaft portion 10c. Figure 2 The slot 12d shown has a pair of claw portions 12b and 12c with a snap-fit ​​portion 12a. In this embodiment, the following situations will be described: Figure 4 As shown, the first connecting part provided on the scraper arm 10 is a connecting shaft part 10c, such as... Figure 2 As shown, the second connecting part provided on the scraper blade 12 is a snap-fit ​​part 12a.

[0053] Furthermore, the pair of claw portions 12b and 12c included in the latch portion 12a are arranged along the long side direction L of the scraper blade 12 and are flexible to each other.

[0054] Moreover, such as Figure 2 As shown, the connecting shaft portion 10c on the brush arm 10 side engages with the groove portion 12d on the brush blade 12 side. Specifically, a groove 12d is formed on the snap-fit ​​portion 12a, and the connecting shaft portion 10c provided on the brush arm 10 engages with the groove 12d of the snap-fit ​​portion 12a mounted on the brush blade 12. That is, the connecting shaft portion 10c provided on the brush arm 10 and the snap-fit ​​portion 12a mounted on the brush blade 12 are snapped together. At this time, the connecting shaft portion 10c engages with the groove portion 12d so that the snap-fit ​​portion 12a can rotate relative to the connecting shaft portion 10c by the required angle.

[0055] in addition, Figure 3 The connecting shaft portion 10c shown is cylindrical, and the connecting shaft portion 10c is in a direction orthogonal to the axial direction N (the extending direction of the shaft portion). Figure 4The outer periphery of the cut surface shown is circular. On the other hand, a generally cylindrical groove 12d is formed on the latching part 12a. Moreover, the cylindrical connecting shaft part 10c is rotatably inserted into the generally cylindrical groove 12d.

[0056] Specifically, such as Figure 2 As shown, in the latching portion 12a of the scraper blade 12, the inner circumferential surface of the groove 12d, which includes a pair of claw portions 12b and 12c, is circular in cross-sectional shape. Furthermore, the diameter of the circle on the inner circumferential surface of the groove 12d is slightly larger than the diameter of the circle on the connecting shaft portion 10c. Therefore, the latching portion 12a can be rotated to engage with the connecting shaft portion 10c at the desired angle.

[0057] In addition, such as Figure 6 As shown, the distance S between the opposing portions of the pair of claw portions 12b and 12c of the latching portion 12a is less than... Figure 4 The diameter R of the circular connecting shaft portion 10c shown. That is, the distance S between the opposing portions of the pair of claw portions 12b and 12c is also the opening width of the groove portion 12d, so it is preferable that R > S. Thus, by the action of the brush arm 10, when wiping the wiping surface such as the rear window of a vehicle, the latch portion 12a can be prevented from slipping off the connecting shaft portion 10c.

[0058] Furthermore, in the connection structure of the brush arm 10 in this embodiment, the connection between the brush arm 10 and the brush blade 12 is made by using the snap-fit ​​part 12a. As a result, when the connecting shaft part 10c is inserted into the groove part 12d, the claw part 12b and the claw part 12c flex, temporarily becoming S>R, so the connecting shaft part 10c can be inserted into the groove part 12.

[0059] In addition, such as Figure 2 As shown, along the long side direction L of the scraper blade 12, slit portions 12e and 12f, serving as cutting portions, are provided on both sides of the pair of claw portions 12b and 12c. Specifically, the slit portion 12e is provided on the outer side of the claw portion 12b (the side of the claw portion 12b opposite to the groove portion 12d), and the slit portion 12f is provided on the outer side of the claw portion 12c (the side of the claw portion 12c opposite to the groove portion 12d). In other words, both sides of the claw portion 12b and both sides of the claw portion 12c are spatial portions.

[0060] Therefore, the pair of claw portions 12b and 12c are each capable of flexing away from the groove portion 12d in the direction along the long side L of the brush blade 12. That is, the pair of claw portions 12b and 12c are each flexible enough to flex away from the groove portion 12d in the direction along the long side L of the brush blade 12. In other words, the pair of claw portions 12b and 12c have the ability to flex away from the groove portion 12d in the direction along the long side L of the brush blade 12. Figure 6The flexibility of the opening width S of the groove 12d shown is flexed in the direction of bending.

[0061] Based on the above, in the connection structure of the brush arm 10 in this embodiment, a connection using the snap-fit ​​part 12a is adopted. Therefore, in the assembly of the brush arm 10 and the brush blade 12, the following can be achieved: Figure 1 As shown, there is an easy-to-assemble insertion force Q and a difficult-to-remove extraction force P.

[0062] Here, the effect obtained by bending the pair of claws 12b and 12c in a direction away from the groove 12d will be explained. For example, when it is desired that the claws 12b and 12c bend along the width direction M of the scraper blade 12 (refer to...) Figure 3 When the brush is bent, the brush blade 12 becomes larger in its width direction M. During the wiping action using the brush blade 12, in order not to obstruct the driver's view, the width direction M of the brush blade 12 must be avoided from becoming larger.

[0063] On the other hand, it is desired that the claw portions 12b and 12c be aligned along the long side L of the scraper blade 12 (refer to...) Figure 2 In the case of flexing, space is easily secured relative to the long side direction L, so it is easy to flex along the long side direction L, and it is also easy to increase the flexing amount of claw 12b and claw 12c.

[0064] Furthermore, in order to rotatably connect the wiper blade 12 to the wiper arm 10 such that the wiper blade 12 follows the curved surface of the rear glass, it is preferable to... Figure 3 The axial direction N of the connecting shaft portion 10c shown is arranged parallel to the width direction M of the scraper blade 12. Therefore, when the claw portions 12b and 12c are flexed along the long side direction L, the space required for the latch portion 12a is the width of each claw portion 12b and 12c plus the amount of flexure plus the diameter of the connecting shaft portion 10c.

[0065] In contrast, when the claw portions 12b and 12c are flexed along the width direction M, the space required for the latching portion 12a is the width of each claw portion 12b and 12c plus the amount of flexure plus the axial length of the connecting shaft portion 10c. Therefore, in the latching portion 12a, when the claw portions 12b and 12c are flexed in the direction away from the groove portion 12d along the long side direction L of the brush blade 12, miniaturization of the brush blade 12 can be achieved.

[0066] Furthermore, when the connection between the brush arm 10 and the brush blade 12 is not achieved using a snap-fit ​​part 12a, the positional relationship between the brush blade 12 and the brush arm 10 needs to be significantly altered between the disassembly / reassembly posture and the rotational posture without disassembly / reassembly of the brush blade 12. This is to prevent the brush blade 12 from slipping off during the rotational posture without disassembly / reassembly. In other words, when assembling the brush arm 10 and the brush blade 12, the brush blade 12 needs to be rotated significantly during assembly, requiring a large working space. Consequently, the rotation direction of the brush blade 12 is restricted to prevent contact between the parts of the brush arm 10 and the brush blade 12 other than the connection part. Additionally, recesses or other clearance parts need to be provided on the brush blade 12 to prevent interference between the tip of the brush arm 10 and the brush blade 12. Furthermore, in order to evenly transmit the pressing pressure of the brush arm 10 to the brush blade 12, it is preferable to provide the connection between the brush arm 10 and the brush blade 12 at the center of the brush blade 12. However, without the connection using the snap-fit ​​part 12a, the front end of the brush blade 12 and the brush arm 10 will interfere with each other. Therefore, it is necessary to position the connection at the front end of the brush arm 10. As a result, there is a design limitation that approximately half of the long side of the brush blade 12 cannot be covered by the brush arm 10.

[0067] In contrast, in the connection structure of the brush arm 10 in this embodiment, the connection between the brush arm 10 and the brush blade 12 is achieved using a snap-fit ​​part 12a. This allows the opening width S of the groove 12d of the snap-fit ​​part 12a to be smaller than the diameter R of the cylindrical connecting shaft 10c, thus preventing the brush blade 12 from slipping off. Therefore, in both the assembly / disassembly and rotational positions of the brush blade 12, there is no need to significantly change the positional relationship between the brush blade 12 and the brush arm 10, thereby reducing limitations on the working space and the assembly direction of the brush blade 12. In other words, the connection structure of the brush arm 10 improves the operability of assembling and disassembling the brush blade 12.

[0068] Furthermore, during the assembly and disassembly of the brush blade 12, it is not necessary to rotate the brush blade 12 to an angle where the front end of the brush arm 10 interferes with the brush blade 12. Therefore, it is not necessary to provide a clearance portion for the brush arm 10 on the brush blade 12, thereby reducing the height of the brush blade 12. Moreover, since the restrictions on the installation position of the connecting shaft portion 10c in the long side direction L of the brush blade 12 are also reduced, for example, the front end of the brush arm 10 can extend to the front end of the brush blade 12, thereby increasing the design flexibility of the brush arm 10.

[0069] Furthermore, in the brush arm 10 and the brush blade 12, the brush blade 12 is equipped with a consumable scraper rubber, so the brush blade 12 is replaced much more frequently than the brush arm 10. Therefore, as in this embodiment, by installing the latching part 12a, including the claw part 12b and the claw part 12c, onto the brush blade 12, the brush blade 12 can be easily replaced together with the claw part 12 if the claw part 12b or the claw part 12c is damaged or deteriorated.

[0070] Next, use Figure 5 and Figure 6 The protrusions 12j and 12k disposed in the slit portions 12e and 12f will be described. Here, the slit portions 12e and 12f each include inner walls 12h and 12i facing each other. That is, the slit portion 12e includes inner walls 12h and 12i facing each other, and the slit portion 12f also includes inner walls 12h and 12i facing each other.

[0071] Furthermore, a first protrusion protruding toward the inward of the slit portion is provided on either of the opposing inner walls 12h and 12i that constitute the slit portion 12e and slit portion 12f, respectively, and a second protrusion protruding toward the inward of the slit portion is provided on the other opposing inner wall. In this embodiment, a protrusion (first protrusion) 12j protruding toward the inward of the slit portion is provided on the inner wall 12h, and a protrusion (second protrusion) 12k protruding toward the inward of the slit portion is provided on the inner wall 12i. Specifically, in the slit portion 12e, the protrusion 12j protruding toward the inward of the slit portion 12e is provided on the inner wall 12h, and the protrusion 12k protruding toward the inward of the slit portion 12e is provided on the inner wall 12i of the wall portion 12p facing the claw portion 12b. On the other hand, in the slit portion 12f, a protrusion 12j protruding toward the inside of the slit portion 12f is provided on the inner wall 12h, and a protrusion 12k protruding toward the inside of the slit portion 12f is provided on the inner wall 12i of the wall portion 12n facing the claw portion 12c.

[0072] In addition, such as Figure 5 As shown, protrusions 12j and 12k are along... Figure 3 The connecting shaft portion 10c shown is offset from each other in the axial direction N. That is, the protrusion 12j provided on the inner wall 12h and the protrusion 12k provided on the inner wall 12i are offset from each other without overlapping in the axial direction N. In other words, the protrusion 12j and the protrusion 12k protrude in a way that is offset from the opposing inner walls 12h and 12i in the axial direction N.

[0073] In addition, such as Figure 6As shown, protrusions 12j and 12k are disposed on opposing inner walls 12h and 12i near the opening ends 12m of each slit portion 12e and slit portion 12f. Specifically, protrusions 12j and 12k are disposed on the inner walls 12h and 12i on the opposite side of the opening ends 12m of the bottom sides of slit portions 12e and 12f.

[0074] Furthermore, the inner walls 12h and 12i, which are arranged facing each other to form the respective slit portions 12e and 12f, are formed such that the opening width T of the slit portions 12e and 12f gradually widens from the bottom of the slit portions 12e and 12f toward the opening end 12m. That is, the facing inner walls 12h and 12i are inclined to each other in such a way that the opening width T of the slit portions 12e and 12f gradually widens from the bottom of the slit portions 12e and 12f toward the opening end 12m. In another description, in each slit portion 12e and slit portion 12f, the inner wall 12h facing the protrusion 12k is inclined such that the opening width T of the slit portion 12e and slit portion 12f gradually narrows towards the bottom. On the other hand, the inner wall 12i facing the protrusion 12j is also inclined such that the opening width T of the slit portion 12e and slit portion 12f gradually narrows towards the bottom. That is, both the inner wall 12h facing the protrusion 12k and the inner wall 12i facing the protrusion 12j are inclined such that the opening width T of the slit portion 12e and slit portion 12f gradually narrows towards the bottom.

[0075] In the snap-fit ​​portion 12a of this embodiment, in each slit portion 12e and slit portion 12f, the protrusions 12j and 12k are misaligned, therefore... Figure 9 As shown, when assembling the brush arm 10 and the brush blade 12, the connecting shaft portion 10c of the brush arm 10 can be prevented from being inserted into the slit portions 12e and 12f of the brush blade 12. Specifically, the opening ends 12m of the slit portions 12e and 12f are narrowed due to the misaligned arrangement of the protrusions 12j and 12k, thus preventing the connecting shaft portion 10c of the brush arm 10 from being inserted into the slit portions 12e and 12f. In other words, misassembly of the brush arm 10 and the brush blade 12 can be prevented. As a result, the connection structure of the brush arm 10 prevents misassembly of the brush blade 12, thereby improving the workability during the assembly of the brush blade 12.

[0076] Furthermore, the protrusions 12j and 12k are positioned near the opening end 12m in each slit portion 12e and slit portion 12f, and the thickness of the root of the claw portions 12b and 12c in the latching portion 12a does not increase. Therefore, the flexibility of the claw portions 12b and 12c in the direction of widening the opening width S of the groove portion 12d remains unchanged. Thus, even with the latching portion 12a having the structure of protrusions 12j and 12k in each slit portion 12e and slit portion 12f, the assembly of the brush arm 10 and the brush blade 12 can maintain the same flexibility. Figure 1 As shown, there is an easy-to-assemble insertion force Q and a difficult-to-remove extraction force P.

[0077] Here, use Figure 7 For structures that utilize protrusions 12j and 12q protruding in the same direction ( Figure 7 (a) and the structure of the protrusion 12j and protrusion 12k that are misaligned and protruding ( Figure 7 Explain the difference in the effects obtained by (b)).

[0078] First of all, Figure 7 In the structure shown in (a) where the protrusions 12j and 12q protrude in the same direction, when a is set to the width required for the claw 12c to flex (a fixed value) and b1 is set to the width of the gap through which the connecting shaft 10c may fit, b1 = a. The value a can be set to a specified size based on the ease of assembly of the snap-fit ​​part 12a and the connecting shaft 10c, or the difficulty of slippage, etc.

[0079] On the other hand, Figure 7 In the structure shown in (b) where the protrusions 12j and 12k are misaligned, when a is set to the width required for the claw 12c to flex (a fixed value) and b2 is set to the width of the possible engagement gap of the connecting shaft 10c, it can be set to b2 = a - (the amount of protrusion of the protrusion 12j), where b2 < b1. That is, Figure 7 The staggered protrusions of the protrusions 12j and 12k shown in (b) can narrow the gap where the connecting shaft portion 10c may fit. That is, by staggering the protrusions 12j and 12k in the slit portions 12e and 12f, the gap where the connecting shaft portion 10c may fit can be narrowed, thus preventing misassembly of the brush arm 10 and the brush blade 12.

[0080] In addition, regarding Figure 8 The distance C between the protrusions 12j and 12k shown can also be small enough that the protrusions 12j and 12k do not interfere with each other. In other words, the width of the protrusions 12j and 12k can also be set large enough that the protrusions 12j and 12k do not interfere with each other.

[0081] Next, variations of this embodiment will be described.

[0082] Figure 10 In the first modified example shown, the width of the protrusion 12j or protrusion 12k is set to be large. Figure 10 In the structure shown, the width D of the protrusion 12k is set to be larger than that of the protrusion 12j. As described, the width of either the protrusion 12j or the protrusion 12k can be set to be large as long as the protrusion 12j and the protrusion 12k do not interfere with each other. In this case, among the protrusion 12j provided on the claw 12c side and the protrusion 12k provided on the wall 12n side, it is preferable to increase the width of the protrusion 12k provided on the wall 12n side. That is, if the width of the protrusion 12j provided on the claw 12c side is increased, the effect on the deflection or strength of the claw 12c will be greater, which is not preferred. Therefore, by increasing the width of the protrusion 12k provided on the wall 12n side, the effect on the deflection or strength of the claw 12c can be minimized. Regarding the above aspect, in Figure 6 The claw portion 12b shown is the same as that in the wall portion 12p.

[0083] exist Figure 11 In the second modified example shown, the protrusions 12j and 12k are in contact with... Figure 3 The axial direction N of the connecting shaft 10c shown is orthogonal to the direction L (refer to). Figure 6 On the surface, parts of the two structures overlap and are configured accordingly. Figure 11 In the structure of the buckle portion 12a shown, the protrusions 12j and 12k are arranged such that their front ends 12r and 12s overlap in a direction L orthogonal to the axial direction N of the connecting shaft portion 10c.

[0084] Specifically, the front end portion 12r of the protrusion 12j and the front end portion 12s of the protrusion 12k overlap as a repeating portion E in a direction L orthogonal to the axial direction N of the connecting shaft portion 10c. That is, the protrusions 12j and 12k are arranged such that the repeating portion E in the protrusion length F of each of the protrusions 12j and 12k partially overlap.

[0085] Thus, the protrusions 12j and 12k are configured such that their front ends 12r and 12s overlap in a direction L orthogonal to the axial direction N of the connecting shaft 10c, thereby eliminating the gap between the protrusions 12j and 12k in the direction L. As a result, the insertion of the connecting shaft 10c of the brush arm 10 into the slits 12e and 12f of the brush blade 12 can be further suppressed, and the misassembly prevention effect of the brush arm 10 and the brush blade 12 can be further improved.

[0086] This invention is not limited to the described embodiments, and various modifications can be made without departing from its spirit. For example, in the described embodiment, a case is shown where the connecting structure of the wiper arm 10 is applied to a rear wiper device for wiping the rear window of a vehicle such as a car. However, the invention is not limited to this and can also be applied to wiper devices mounted on the front of vehicles such as cars, or wiper devices mounted on ships, airplanes, railway vehicles, etc. Furthermore, in the described embodiment, the wiper arm 10 is molded using a resin material. However, the invention is not limited to this and can also be molded using a metal material.

Claims

1. A connecting structure for a scraper arm, comprising: Scraper arm; The scraper blade is connected to the scraper arm; A first connecting part is disposed on the scraper arm; and The second connecting part is disposed on the scraper blade and connected to the first connecting part. The characteristic of the connecting structure of the scraper arm is that, Either the first connecting portion or the second connecting portion is a connecting shaft portion extending along the width direction of the scraper arm. The first connecting portion or the second connecting portion includes a pair of claw portions that form a groove capable of engaging with the connecting shaft portion. The pair of claws have flexibility, bending in the direction that widens the opening width of the groove. Along the long side of the scraper blade, slits formed by opposing inner walls are provided on both sides of the pair of claws. A first protrusion protruding into the slit portion is provided on one of the opposing inner walls, and a second protrusion protruding into the slit portion is provided on the other of the opposing inner walls. The first protrusion and the second protrusion are staggered relative to each other in a direction along the axial direction of the connecting shaft, such that the minimum width of the opening end of the slit is less than the maximum width of the bottom of the slit.

2. The connecting structure of the scraper arm according to claim 1, characterized in that, The first protrusion and the second protrusion are disposed on the opposing inner walls in such a manner that they are located at the opening end of the slit portion.

3. The connecting structure of the scraper arm according to claim 1 or 2, characterized in that, The first protrusion and the second protrusion partially overlap each other in a direction orthogonal to the axial direction of the connecting shaft.

4. The connecting structure of the scraper arm according to claim 1 or 2, characterized in that, The opposing inner walls are formed such that the opening width of the slit gradually widens as it moves toward the opening end of the slit.

5. The connecting structure of the scraper arm according to claim 1 or 2, characterized in that, The first connecting part is the connecting shaft part, and the second connecting part is the pair of claw parts.

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