Elastic support member and boneless wiper

Abstract

The present application discloses a kind of elastic supporting components, with lateral central axis Y as demarcation, respectively to two ends form first arc member and second arc member, the first arc member has first bending base point, the second arc member has second bending base point, the first arc member is located in the minimum radius of curvature at first bending base point, the second arc member is located in the minimum radius of curvature at second bending base point;While the present application also discloses the use of this elastic supporting component boneless wiper, it includes wiper connector support, elastic supporting component, wiper rubber strip and two sheaths, the inner cavity of the wiper connector support is provided with two guide limit components and at least one longitudinal limit, the interval L1 between the two guide limit components is between 1 / 3 and 2 / 3 of the total length L2 of elastic supporting component, two sheaths are arranged at the two ends of wiper connector support, and are used to wrap the part of elastic supporting component extending outward from wiper connector support, while the outside surface of the sheath is formed with guide surface for reducing wind resistance generated during wiper scraping process.

Description

Technical Field

[0001] This invention relates to the field of automotive wiper systems for wiping windshields, and more specifically to an elastic support component and a frameless wiper equipped with the elastic support component. Background Technology

[0002] Conventional frameless wipers include at least one elastic support component, which is a prefabricated arc-shaped sheet. The radius of curvature of this arc-shaped sheet gradually increases from the middle to both ends, meaning that the elastic support component can be in a naturally extended state when not subjected to external force. The arc in the middle is the largest, and the two ends gradually become flat. Generally, a wiper connecting device for hinged wiper arms is loaded at the middle position of the elastic support component. The wiper arms apply pushing force to the elastic support component through the wiper connecting device, so that the elastic support component can freely and elastically deform and act on the wiper blade, ensuring that the wiping blade of the wiper blade can always be in contact with the surface of the windshield, thereby wiping the windshield. However, conventional wiper connectors are relatively short, generally less than 1 / 3 of the total length of the wiper blade. The support points of the wiper connector on the elastic support component are often concentrated in the middle of the elastic support component. Therefore, the push force of the wiper blade at both ends of the elastic support component is minimal. Furthermore, as the curvature of the two sides of the windshield gradually increases, the two ends of the wiper blade cannot fit tightly against the surface of the windshield, affecting the wiping effect of the wiper. Summary of the Invention

[0003] The first objective of this invention is to provide an elastic support component with a better radius of curvature design, which can drive the wiper blade to fit more tightly against the windshield surface.

[0004] The second objective of this invention is to provide a frameless windshield wiper with high cleaning efficiency.

[0005] A third objective of this invention is to provide a frameless wiper with a more stable connection structure.

[0006] To achieve the first objective of this invention, this application discloses an elastic support component having an arc-shaped sheet extending along its length and having curvature. This elastic support component is used to pre-bend the wiper blade. When the elastic support component is in a naturally extended state and resting horizontally, the elastic support component forms a first arc-shaped member and a second arc-shaped member at both ends, with the lateral central axis Y as the boundary. The first arc-shaped member has a first bending base point, and the second arc-shaped member has a second bending base point. The first arc-shaped member has the smallest radius of curvature at the first bending base point, and the second arc-shaped member has the smallest radius of curvature at the second bending base point. The height above the ground of the line connecting the first bending base point and the second bending base point is less than the height above the ground of the center point O.

[0007] The lateral centerline Y is defined as the midline that divides the elastic support component in two along its length. The bending reference point is defined by measuring a certain arc length before and after each point on the longitudinal centerline of the elastic support component or on a longitudinal line parallel to it. For example, taking an arc length of 20mm as an example, the radius of curvature corresponding to the 10mm arc length before and after each point is the radius of curvature of that point. The point with the smallest radius of curvature is selected as the bending reference point (the 10mm arc length points at both ends of the elastic support component are ignored). The length of the selected arc length is related to the total length of the elastic support component. The longer the length, the larger the span of the selected arc length.

[0008] Furthermore, when the elastic support component is compressed and fits against the horizontal plane, the length M1 from the first bending base point to the second bending base point is between 1 / 3 and 2 / 3 of the total length L2 of the elastic support component.

[0009] To achieve the second objective of this invention, this invention discloses a frameless windshield wiper, comprising:

[0010] A wiper connector bracket has a mounting portion in its middle for receiving the wiper arm, and at least at both ends of the mounting portion, a downwardly open cover component is constructed by extending outward along its length direction. The inner wall of the cover component includes two guide limiting components and at least one longitudinal limiting portion.

[0011] At least one of the aforementioned elastic support components is directly or indirectly assembled into the two guide limiting components through an intermediate connector. The elastic support component is also provided with a snap-fit ​​portion for longitudinal limiting engagement with the longitudinal limiting portion.

[0012] The two guide limiting members are respectively positioned opposite to the first bending base point and the second bending base point, so that the wiper connector bracket transmits the pushing force applied to it by the wiper arm to the elastic support component through the guide limiting members;

[0013] A wiper blade that can be directly or through an intermediate connector to an elastic support component and to receive the pushing force transmitted by the elastic support component;

[0014] Two sheaths are provided at both ends of the wiper connector bracket and are used to cover the portion of the elastic support component extending outward from the wiper connector bracket. At the same time, the sheaths and the outer surface of the wiper connector bracket together form a guide surface that helps to reduce the wind resistance generated during the wiper wiping process.

[0015] By adopting the above structure, the wiper disclosed in this invention has the following innovative features that distinguish it from existing wipers:

[0016] The wiper head bracket (rigid material) is constructed as a cover component with a downward opening. The overall length of the cover component is at least greater than 1 / 3 of the total length of the elastic support component, and a guide surface is formed on the outer surface of the cover component to reduce wind resistance.

[0017] Two guide and limiting components with a sufficiently large span are set inside the wiper connector bracket, and the span length L1 is at least greater than or equal to 1 / 3 of the length L2 of the elastic support component.

[0018] By adjusting the curvature radius of the prefabricated elastic support component to match the position of the force-bearing part of the guide limiting component, the elastic support component can be further enhanced to transmit the pushing force applied by the guide limiting component to the first bending base point and the second bending base point to both ends of the first arc-shaped component and the second arc-shaped component, respectively, thereby further improving the technical effect of better adhesion between the wiper blade and the windshield.

[0019] By artificially increasing the length of the wiper connector bracket, its inner cavity has a sufficiently long space for arranging two long-span guide limiting components. By applying pushing force to the positions of the first and second bending base points of the elastic support component through the two long-span guide limiting components, it can be ensured that the wiper blade coupled to the elastic support component better fits the outer surface of the windshield, especially in the areas located at the beginning and end of the elastic support component.

[0020] To achieve the third objective of the present invention, the longitudinal limiting part is positioned away from the mounting part. This arrangement can minimize the unnecessary separation between the snap-fit ​​part of the elastic support component of the assembled wiper and the longitudinal limiting part, thereby increasing the stability of the wiper connection. Attached Figure Description

[0021] Figure 1 An exploded perspective view of Embodiment 1 of the frameless windshield wiper of the present invention;

[0022] Figure 2 A perspective view of the wiper connector bracket (first type) of the present invention;

[0023] Figure 3-1 A lateral schematic diagram of the elastic support component of the present invention in its naturally extended state;

[0024] Figure 3-2 A lateral view of the elastic support component of the present invention in a state of being compressed and in contact with a horizontal plane;

[0025] Figure 4 Assembly diagram of the frameless wiper of the present invention;

[0026] Figure 5 A bottom view of the frameless wiper blade (first type) of the present invention;

[0027] Figure 6 yes Figure 5 A cross-sectional view along the AA direction;

[0028] Figure 7 yes Figure 5 A cross-sectional view along the BB direction;

[0029] Figure 8 A three-dimensional schematic diagram of the invention of a frameless windshield wiper using a second mounting bracket;

[0030] Figure 9 A three-dimensional schematic diagram of the frameless wiper of the present invention using a third mounting bracket;

[0031] Figure 10 Exploded perspective view of the frameless wiper (second type) of the present invention;

[0032] Figure 11 A perspective view of the wiper connector bracket (second type) of the present invention;

[0033] Figure 12 A schematic cross-sectional view of the frameless wiper (second type) of the present invention along the central axis after removing the sheath;

[0034] Figure 13 A cross-sectional schematic diagram of the frameless wiper (second type) of the present invention located at the longitudinal limiting part. Implementation

[0035] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0036] Type 1 frameless wiper: The elastic support component 2a is directly inserted into the two guide limiting components 12a of the wiper connector bracket 1a, as described in detail below with reference to the attached drawings.

[0037] like Figure 1 This invention discloses a frameless windshield wiper, comprising a wiper head bracket 1a, an elastic support component 2a, a wiper blade 3, and two protective sleeves 4a. The wiper head bracket 1a is an integral, elongated, and downward-facing cover component, generally made of rigid plastic. Its outer surface can be configured as a guide surface 14 to effectively reduce wind resistance, and its inner cavity can be reinforced with several reinforcing ribs 15 according to structural strength requirements. The wiper head bracket 1a has mounting portions 11a, 11b, and 11c in the middle for directly or indirectly receiving the wiper arm 200. A first specific embodiment of the mounting portion 11a is described below. Figure 1 Combination Figure 10 It includes a through groove 111a formed in the middle of the cover component, and a connecting rod 112a placed horizontally in the through groove 111a (see Figure 10 The connecting rod 112a is used to pivotally connect to the wiper connector 6a, thereby enabling the mounting part 11a to indirectly receive the wiper arm 200. Of course, the wiper connector 6a can be selected according to different wiper arms. The wiper connector 6a disclosed in this figure is used to adapt to commonly used hook-type wiper arms. For a second specific embodiment of the mounting part 11b, please refer to... Figure 8 The mounting part 11b includes a recessed support plane 111b and a connector device 112b. The connector device 112b is integrally formed and protrudes from the support plane 111b. The connector device 112b can be made into a mating part that is directly hinged to the wiper arm to realize the direct reception of the wiper arm, or it can be made into a mating part that is hinged to the wiper connector and then connected to the wiper arm through the wiper connector, thereby realizing the indirect reception of the wiper arm by the mounting part 11b (the corresponding inventive concept can be found in CN113525300A); for a third specific embodiment of the mounting part 11c, please refer to Figure 9 The mounting part 11c includes a mounting base 111c and a connecting unit 112c. The mounting base 111c has a recessed base 1111c and two slots 1112c located at both ends of the base 1111c along its length. Preferably, the base 111c has a limiting protrusion 1113c symmetrically arranged in its width direction. One end of the connecting unit 112c has an elastic buckle 1121c that can produce positional displacement, and the other end has a protrusion 1122c. The elasticity of the connecting unit 112c... The buckle 1121c and the protrusion 1122c are respectively coupled to the corresponding slot 1112c, so that the connecting unit 112c is fixed on the mounting base 111c. The connecting unit 112c has a mating part that is hinged to the wiper arm. Alternatively, the connecting unit 112c can also be hinged to a wiper connector, and the connection with the wiper arm can be achieved through the wiper connector. For inventive concepts that are basically similar to the mounting part 11c, please refer to CN110843730A or CN106240529A.

[0038] like Figure 2The wiper connector bracket 1a has a cover component with two sidewalls 10 spaced apart and substantially parallel along its width direction. Two guide limiting members 12a and at least one longitudinal limiting part 13a are spaced apart along the length direction of the two sidewalls 10. The guide limiting members 12a are used to directly assemble the elastic support component 2a. Their specific structure consists of sliding grooves 120a protruding towards each other on the inner walls of the two sidewalls 10. Typically, each sliding groove 120a includes a top edge 1201a, a side edge 1202a, and a bottom edge 1203a. An opening for the wiper blade 3 to pass through exists between the bottom edges 1203a of each sliding groove 120a, provided the distance between the top edge 1201a and the bottom edge 1203a is sufficient to accommodate the wiper blade 3. The elastic support component 2a is sufficient. In some embodiments, if the thickness of the side wall 10 is sufficiently thick, the side wall 10 can directly serve as the side of the groove 120a without the need for additional sidewalls. However, this approach would increase the overall thickness of the side wall 10, requiring additional material and increasing production costs. Furthermore, the outer surface of a thicker injection molded part is prone to pitting or cracking, reducing product yield and hindering lightweight design. Therefore, in this embodiment, the groove 120a preferably adds a sidewall 1202a to the existing side wall 10 to improve the overall strength of the groove 120a. A more optimized design is that the top edges 1201a of each groove 120a are interconnected to form a transverse connecting segment A. Section A increases the lateral compressive strength of the wiper head bracket 1a. Simultaneously, to effectively control the distance between the top edge 1201a and the bottom edge 1203a of the slide groove 120a, a positioning rib 1204a is protruded from the inner end face of the top edge 1201a. The positioning rib 1204a has two mutually perpendicular first straight edges 12041a and second straight edges 12042a. The first straight edge 12041a is parallel to and staggered with the bottom edge 1203a. The two ends of the second straight edge 12042a are respectively connected to the side edge 1202a and the first straight edge 12041a. The vertical distance between the positioning rib 1204a and the bottom edge 1203a matches the thickness of the elastic support component 2a. Through the above design... In manufacturing, controlling the machining accuracy of the first straight edge 12041a and the second straight edge 12042a is easier to achieve than controlling the machining accuracy of the inner end face of the top edge 1201a. Moreover, the structural strength of the overall slide groove 120a can be guaranteed without increasing the amount of material. It should be emphasized that one of the main innovations of this invention is to artificially expand the distance L1 between the two guide limiting members 12a. The distance L1 is between 1 / 3 and 2 / 3 of the total length L2 of the elastic support member 2a. More preferably, when the total length L2 of the elastic support member 2a is set in the range of 300mm≤L2≤800mm, the distance L1 between the two guide limiting members 12a is 150mm≤L1≤300mm.A more preferred configuration is that when the total length L2 of the elastic support member 2a is set within the range of 350mm-700mm, the distance L1 between the two guide limiting members 12a is 175mm-250mm.

[0039] like Figure 5 The longitudinal limiting part 13a is a T-shaped limiting block, and there are two of them. They are respectively protruding from the inner ends of the two side walls 10 and adjacent to one of the guide limiting members 12a. The elastic support member 2a has a locking part 21a at a position relative to the longitudinal limiting part 13a. The locking part 21a is a limiting notch (such as...). Figure 1 The longitudinal limiting part 13a and the snap-fit ​​part 21a interlock to limit the relative displacement between the elastic support member 2a and the wiper connector bracket 1a along the length direction. Alternatively, the longitudinal limiting part 13a can be designed as a limiting block (not shown) built into the groove 120a, meaning the longitudinal limiting part 13a is positioned away from the mounting part 11a. The advantage of this design is that when the mounting part 11a of the wiper connector bracket 1a adopts a through groove 111a design, the wiper arm 200, during installation, will often have its head protrude into the through groove 111a and press against the middle of the elastic support member 2a, causing it to shift downwards along the height direction. When consumers receive windshield wipers, especially frameless wipers, they often unconsciously bend them by both ends to feel their overall elasticity. This can cause a noticeable positional shift in the height direction of the elastic support component 2a. However, because the longitudinal limiting part 13a is positioned away from the mounting part 11a and adjacent to or directly within the guide limiting member 12a, the positional shift of the elastic support component 2a in the snap-fit ​​part 21a region is negligible. This ensures that the assembled elastic support component 2a is unlikely to detach from the wiper head bracket 1a, thus ensuring the safety of the wiper during wiping. In a further optimized design, the snap-fit ​​part 21a of the elastic support component 2a is symmetrically arranged with the lateral central axis Y as a reference (not shown in the figure), allowing production line workers to assemble the component without considering its assembly direction.

[0040] like Figure 3-1 and Figure 3-2The elastic support component 2a disclosed in this embodiment is composed of two elastic sheet-like bodies 20 extending along the length direction. The elastic sheet-like bodies 20 are pre-formed with a certain curvature, and the first and last ends of the two elastic sheet-like bodies 20 are respectively fixed by a connecting block 51, so that a gap 22 for the wiper blade 3 to pass through is formed between the two elastic sheet-like bodies 20. Of course, there are many other ways to form a gap between the two elastic sheet-like bodies 20. For example, the two elastic sheet-like bodies can be fixed by end buckles set at both ends, or the gap can be formed by punching a whole elastic sheet-like body. In short, the above-mentioned elastic support component 2a with gap 22 is not the innovation protected by this invention, but this invention The present invention creatively adjusts the curvature of the elastic support component 2a. Conventional elastic support components only have a bending base point in the middle, with the overall radius of curvature gradually increasing from the middle to both ends. In contrast, the elastic support component 2a of the present invention forms a first arc-shaped component I and a second arc-shaped component II at both ends, with the lateral central axis Y as the dividing line. The first arc-shaped component I has a first bending base point G1, and the second arc-shaped component II has a second bending base point G2. The first arc-shaped component I has the smallest radius of curvature at the first bending base point G1, and the second arc-shaped component II has the smallest radius of curvature at the second bending base point G2. The first arc-shaped component I and the second arc-shaped component II are located along the lateral axis of the elastic support component 2a. The first arc-shaped component I is symmetrically distributed along the central axis Y. Its radius of curvature gradually increases from the first bending base point G1 towards both ends. When the elastic support component 2a is horizontally stationary without applied force, the height of the line connecting the first bending base point G1 and the second bending base point G2 is less than the height of the center point O. When the elastic support component 2a is compressed and in contact with the horizontal plane, the length M1 from the first bending base point G1 to the second bending base point G2 is between 1 / 3 and 2 / 3 of the total length L2 of the elastic support component 2a. When the elastic support component 2a is assembled in place, it will undergo a certain pre-bending. At this time, the positions of the first bending base point G1 and the second bending base point G2 are exactly opposite to the position of the guide limiting component 12a. Therefore... The distance between the first bending base point G1 and the second bending base point G2 is approximately equal to the distance L1 between the two guide limiting members 12a. L1 is less than M1. The inner top walls of the two guide limiting members 12a (the first straight edge 12041a of the groove 120a) act on the first bending base point G1 and the second bending base point G2 respectively. Through the above arrangement, it can be ensured that the first bending base point G1 and the second bending base point G2 of the elastic support member 2a are subjected to the pushing force applied to them by the guide limiting member 12a. The force can be transmitted more evenly to the two ends of the first arc member I and the second arc member II, so that the two ends of the elastic support member 2a can better fit with the outer surface of the windshield and improve the wiping cleanliness of the wiper.

[0041] like Figure 1 , 4 Up to 7, the wiper blade 3 is directly inserted into the slot 22 formed in the middle of the elastic support component 2a, and its ends are limited by a rubber strip plug 52a. A more detailed description of this structure can be found in CN109795452A. Two sheaths 4a are respectively disposed at both ends of the wiper connector bracket 1a, and are preferably made of soft material. The inner cavity of the sheath 4a has two fixing grooves 41a and 42a, which are used to wrap the portion of the elastic support component 2a extending outward from the wiper connector bracket 1a. Simultaneously, the outer surface of the sheath 4a forms a guide surface 43 that helps reduce wind resistance generated during wiper wiping. A necessary receiving cavity 44a is provided at one end of the connecting block 51a, which is used to form a nested fit with the connecting block 51a. The other end is inserted into the inner cavity of the wiper connector bracket 1a. In short, according to the disclosure of the prior art, those skilled in the art can achieve a stable connection of the sheath 4a to the elastic support member 2a by means of necessary technical means. This structure is not the focus of protection of this invention. It should be noted that the connection structure between the elastic support member 2a and the wiper blade 3 and the sheath 4a is not limited to the above structure. The wiper blade 3 and the sheath 4a can be fixed by the end buckles set at the beginning and end of the wiper blade. See CN10744347A. Figure 1 The structural design is also a common technical approach in this field, but the aforementioned connection method can make the overall appearance design of the wiper simpler.

[0042] The second type of frameless wiper: the elastic support component 2b is connected to the wiper head bracket 1b through the intermediate connector 7, which is described in detail below with reference to the attached drawings.

[0043] The positional layout of the wiper connector bracket 1b disclosed in this type, involving the two guide limiting members 12b and the longitudinal limiting part 13b, and the innovative design of the pre-curved arc of the elastic support member 2b, are consistent with the inventive concept described in the first type of frameless wiper, and will not be repeated here. The main difference between the two embodiments is that the second type of frameless wiper achieves the connection between the elastic support member 2b, the sheath 4b, and the wiper blade 3 by adding an intermediate connecting member 7. At the same time, the elastic support member 2b is selected as a complete elastic sheet, eliminating the need for a gap at the central axis position. The specific structure can be referred to in CN108657127A and CN213056999U, and will not be repeated here. However, how to achieve the connection and fixation between the elastic support member 2b and the wiper connector bracket 1b, and how the intermediate connecting member 7 is connected to the wiper connector bracket 1b, involves an innovative structure of the snap-fit ​​part 21b of the wiper connector bracket 1b and the elastic support member 2b. For details, please refer to [link to relevant documentation]. Figures 10 to 13The intermediate connector 7 is a bearing clamp, which is a long strip of plastic. It has a first receiving groove 71 and a second receiving groove 72 arranged from top to bottom. The first receiving groove 71 is used to insert the elastic support member 2b, and at least one opening is provided at the top of the first receiving groove 71 for the elastic support member 2b to be exposed. In a specific implementation, there is a through notch at the top of the first receiving groove 71 along the length direction. The bottom of the second receiving groove 72 forms a notch 73 for the wiper blade 3 to pass through. At the same time, a side wing 74 extending outward along its width direction is provided at the junction of the first receiving groove 71 and the second receiving groove 72.

[0044] The cover component of the wiper connector bracket 1b has two sidewalls 10 spaced apart and substantially parallel along its width direction. Each sidewall 10 forms inwardly guiding and limiting grooves 120b for the two side wings 74 of the supporting clamp 7 to pass through. A horizontally placed connecting piece 121b is formed at the upper part of the two guiding and limiting grooves 120b. The two guiding and limiting grooves 120b and the connecting piece 121b together constitute the guiding and limiting component 12b. At least one of the guiding and limiting components 12b's connecting piece 121b faces the elastic support component 2b. A positioning part 13b is provided in the direction of the longitudinal limiting part 13b. The positioning part 13b is composed of a positioning block 131 protruding from the connecting piece 121b. The two end faces of the positioning block 131 along the length direction form limiting mating surfaces 132. The snap-fit ​​part 21b of the elastic support member 2b is composed of a limiting spring piece 211. The limiting spring piece 211 is thin and extends upward to form a pair of upward-facing, V-shaped fins 212. The limiting spring piece 211 is provided in the elastic support member 2b. The upper surface cannot be moved relative to it in the length and width directions. One specific implementation method is to open two pairs of oppositely arranged notches 23 on both sides of the elastic support component 2b. The two sides of the limiting spring piece 211 are provided with two downwardly bent edges 2111 at the corresponding notches 23. The two pairs of bent edges 2111 are correspondingly locked in the two notches 23 of the elastic support component 2b. The height of the bent edges 2111 is less than or equal to the thickness of the elastic support component 2b, thereby realizing the horizontal positioning between the limiting spring piece 211 and the elastic support component 2b. Of course, the present invention is not limited to this specific structure. Those skilled in the art can achieve the horizontal positioning of the two by welding or different limiting fit methods. When the limiting spring piece 211 cannot move horizontally and is set on the upper surface of the elastic support component 2b, the two open free ends of the limiting spring piece 211 are respectively locked and limited fit surfaces 132 at both ends of the positioning block 131, thereby realizing the relative fixation of the elastic support component 2b and the wiper connector bracket 1b in the length direction. More optimized settings, such as Figure 11A pressing strip 134 is provided on both sides of the positioning block 131 along the length direction. It is used to press against the upper surface of the limiting spring 211. At the same time, a guide block 133 with an inclined surface is formed by extending outward from the middle part of the two limiting mating surfaces 132 of the positioning block 131. The height of the inclined surface of the guide block 133 gradually decreases from the length direction away from the positioning block 131. With this arrangement, when the elastic support component 2b with the limiting spring 21b is inserted into the guide limiting component 12b of the wiper connector bracket 1b, the guide block 133 at the insertion end and the fins 212 of the limiting spring 211 are guided and mated to each other. This makes it easier for the fins 212 on the insertion end side of the limiting spring 211 to pass over the positioning block 131, and finally make the free ends of the two fins 212 face and lock the limiting mating surfaces 132 at both ends of the positioning block 131. A more preferred design is that each of the connecting pieces 121b of the guide limiting member 12b is provided with a longitudinal limiting portion 13b on its inner end face. This design facilitates assembly without distinguishing the direction of the elastic support member 2b, allowing for arbitrary assembly and improving assembly efficiency.

[0045] The assembly method of the wiper in this embodiment is as follows: The limiting spring 21b is placed on the elastic support component 2b, and then inserted into the first receiving groove 71 of the bearing clamp 7. The wiper blade 3 is inserted into the second receiving groove 72 of the bearing clamp 7. Then, the two side wings 74 of the bearing clamp 7 are sequentially inserted into the guide limiting grooves 120b of the two guide limiting members 12b of the wiper connector bracket 1b, so that the two fins on the limiting spring 21b are respectively engaged with the two limiting mating surfaces 132 of the longitudinal limiting part 13b, achieving initial positioning of the elastic support component 2b and the wiper connector bracket 1b. Finally, the two locking mechanisms located at both ends of the bearing clamp 7 are used for further positioning. Component 5b locks the elastic support component 2b and the wiper blade 3 onto the bearing clamp 7. Finally, two sleeves 4b are respectively located on both sides of the wiper connector bracket 1b. The sleeves 4b have hollow inner cavities and an open end 41b at the bottom along their length. The bottom has grooves 42b on both sides of the open end 41b for inserting the two side wings 74 of the bearing clamp 7. The outer side has a guide surface 43. The two grooves 42b of each sleeve 4b are respectively fitted onto the two side wings 74 of the bearing clamp 7. One end of the sleeve is nested and limited with the locking component 5b, and the other end is inserted into the inner cavity of the wiper connector bracket 1b to realize the assembly of the wiper. Of course, wrapping the locking component 5b with the sleeve 4b is only one embodiment. Setting the locking component 5b at the outer end of the sleeve 4b and locking the sleeve, bearing clamp, elastic support component and wiper blade is also a conventional technical means.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An elastic support member for a frameless wiper blade, the elastic support member having an arcuate sheet extending along its length and having a curvature, the elastic support member (2a, 2b) for pre-bending the wiper blade (3), characterized in that: When the elastic support components (2a, 2b) are in a naturally extended state and stationary in the horizontal direction, the elastic support components (2a, 2b) form a first arc-shaped component (I) and a second arc-shaped component (II) at opposite ends, with the lateral central axis Y as the boundary. The first arc-shaped component (I) has a first bending base point (G1), and the second arc-shaped component (II) has a second bending base point (G2). The first arc-shaped component (I) has the smallest radius of curvature at the first bending base point (G1), and the second arc-shaped component (II) has the smallest radius of curvature at the second bending base point (G2). The radius of curvature is the smallest. The height above the ground of the line connecting the first bending base point (G1) and the second bending base point (G2) is less than the height above the ground of the center point O. The first bending base point (G1) and the second bending base point (G2) are positioned opposite to the two guide limiting members (12a, 12b) used to directly or indirectly install the elastic support member (2a, 2b) to the wiper head bracket (1a, 1b), so that the elastic support member (2a, 2b) can receive the pushing force applied by the wiper arm transmitted to it by the wiper head bracket (1a, 1b) through the guide limiting members (12a, 12b).

2. The elastic support component as described in claim 1, characterized in that: The first arc-shaped member (I) and the second arc-shaped member (II) are symmetrically distributed along the lateral central axis Y of the elastic support members (2a, 2b). The radius of curvature of the first arc-shaped member (I) gradually increases from the first bending base point (G1) to both ends.

3. The elastic support component as described in claim 1 or 2, characterized in that: When the elastic support components (2a, 2b) are pressed and in contact with the horizontal plane, the length M1 from the first bending base point (G1) to the second bending base point (G2) is between 1 / 3 and 2 / 3 of the total length L2 of the elastic support components (2a, 2b).

4. A frameless windshield wiper, characterized in that: It includes, A wiper connector bracket (1a, 1b) has a mounting part (11) for receiving the wiper arm in its middle, and a cover member with a downward opening is constructed at least at both ends of the mounting part along its length direction. The inner wall of the cover member includes two guide limiting members (12a, 12b) and at least one longitudinal limiting part (13a, 13b). At least one elastic support member (2a, 2b) as described in any one of claims 1-3, wherein the elastic support member (2a, 2b) is directly or indirectly assembled in the two guide limiting members (12a, 12b) through an intermediate connector (7), and the elastic support member (2a, 2b) is further provided with a snap-fit ​​portion (21a, 21b) for longitudinal limiting cooperation with the longitudinal limiting portion (13a, 13b); A wiper blade (3) can be directly or through an intermediate connector (7) connected to the elastic support components (2a, 2b) and bear the pushing force transmitted by the elastic support components (2a, 2b); Two sheaths (4a, 4b) are disposed at both ends of the wiper connector bracket (1a, 1b) and are used to wrap the portion of the elastic support component (2a, 2b) extending outward from the wiper connector bracket (1a, 1b). At the same time, the sheaths (4a, 4b) and the outer surfaces of the wiper connector bracket (1a, 1b) together form a guide surface (43, 14) that helps to reduce the wind resistance generated during the wiper wiping process.

5. The frameless wiper blade as described in claim 4, characterized in that: The distance L1 between the two guide limiting members (12a, 12b) is less than the length M1 from the first bending base point (G1) to the second bending base point (G2), which is 150mm≤L1≤300mm. The total length L2 of the elastic support member (2a, 2b) is positively correlated with the distance L1 between the two guide limiting members (12a, 12b), and its range is 300mm≤L2≤800mm.

6. The frameless wiper blade as described in claim 5, characterized in that: The distance L1 between the two guide limiting members (12a, 12b) is [175mm 250mm], and the total length L2 of the elastic support members (2a, 2b) is set in the range of [350mm 700mm].

7. The frameless wiper blade as described in claim 4, characterized in that: The longitudinal limiting parts (13a, 13b) are located away from the mounting part (11).

8. The frameless wiper blade as described in claim 7, characterized in that: The longitudinal limiting parts (13a, 13b) are located at positions that overlap with and are adjacent to the guide limiting members (12a, 12b).

9. The frameless wiper according to any one of claims 4-8, characterized in that: It does not include intermediate connectors; The cover component of the wiper connector bracket (1a) has two side walls (10) spaced apart and arranged in a basically parallel manner along its width direction. The two side walls (10) respectively form inward grooves (120a) for the elastic support component (2a) to be directly assembled. An opening for the wiper rubber strip (3) to pass through is formed between the bottom edges (1203a) of the two grooves (120a). The two grooves (120a) together form a guide limiting component (12a). The longitudinal limiting part is a limiting block (13a), which is disposed on the inner side wall end of the slide groove (120a), or is protruded inward on both side walls (10) and located in the area adjacent to the guide limiting member (12a); The longitudinal central portion of the elastic support member (2a) forms a slit (22a) through which the wiper blade (3) passes, and the elastic support member (2a) has a corresponding limiting notch (21a) at a position relative to the limiting block (13a), the limiting notch (21a) being constructed as the aforementioned snap-fit ​​portion; The wiper blade (3) is directly assembled and fixed in the gap (22a) formed by the elastic support component (2a).

10. The frameless wiper blade as described in claim 9, characterized in that: Each groove (120a) includes a top edge (1201a), a side edge (1202a), a bottom edge (1203a), and a positioning rib (1204a). The side edge (1202a) protrudes from the inner end face of the side wall (10). The top edge (1201a), side edge (1202a), and bottom edge together form a U-shaped component. The top edge (1201a) of each groove (120a) is connected to each other to form a transverse connecting section (A). The positioning rib protrudes from the inner end face of the top edge and has two mutually perpendicular first straight edges and second straight edges. The first straight edge is parallel to the length direction of the wiper connector bracket and is parallel to and staggered with the bottom edge. The two ends of the second straight edge are respectively connected to the side edge and the first straight edge. The vertical distance between the positioning rib and the bottom edge matches the thickness of the elastic support component.

11. The frameless wiper according to any one of claims 4-8, characterized in that: It includes an intermediate connector (7), which is a bearing clamp (7). The bearing clamp (7) is long and has a first receiving groove (71) and a second receiving groove (72) arranged from top to bottom. The first receiving groove (71) is used to insert the elastic support member (2b), and at least one opening is provided at the top of the first receiving groove (71) for the elastic support member (2b) to be exposed. The bottom of the second receiving groove (72) forms a notch (73) for the wiper blade (3) to be inserted. At the same time, a side wing (74) extending outward along its width direction is provided at the junction of the first receiving groove (71) and the second receiving groove (72). The cover component of the wiper connector bracket (1b) has two side walls (10) spaced apart and substantially parallel along its width direction. The two side walls (10) respectively form guide limiting grooves (120b) for the two side wings (74) of the bearing clamp (7) to pass through. A horizontal connecting piece (121b) is formed on the upper part of the two guide limiting grooves (120b). The two guide limiting grooves (120b) and the connecting piece (121b) are constructed together to form the guide limiting component (12b). At the same time, at least one of the guide limiting components (12b) has a positioning part (13b) in the direction of the connecting piece (121b) facing the elastic support component (2b). The positioning part (13b) is constructed as a longitudinal limiting part (13b). The upper surface of the elastic support member (2b) is provided with a snap-fit ​​part (21b) at a position relative to the positioning part (13b). The snap-fit ​​part (21b) is used to engage and limit the positioning part (13b) of the wiper connector bracket (1b) to achieve the limiting of the elastic support member (2b) relative to the wiper connector bracket (1b) along the length direction. The wiper blade (3) is inserted into the second receiving groove (72) of the bearing clamp (7).

12. The frameless wiper blade as described in claim 11, characterized in that: The positioning part (13b) is composed of a positioning block (131) protruding on the connecting piece (121b), and the positioning block (131) has a limiting mating surface (132) on both end faces along the length direction; The snap-fit ​​portion (21b) of the elastic support component (2b) is composed of a limiting spring (211). The limiting spring (211) is thin and extends upward to form a pair of upward-facing, figure-eight shaped fins (212). The limiting spring (211) is disposed on the upper surface of the elastic support component (2b) and cannot generate relative displacement with it in the length and width directions. The free ends of the two fins (212) of the limiting spring (211) are respectively snapped and limited to the limiting mating surfaces on both sides of the positioning block (131).

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