Boneless windshield wiper elastic piece and boneless windshield wiper

Abstract

The boneless windshield wiper elastic piece comprises a front section, a middle section and a rear section which are sequentially distributed in the length direction of the elastic piece, a plurality of through holes are formed in the front section and the rear section of the elastic piece, and the through holes penetrate through the elastic piece in the thickness direction of the elastic piece. The areas of the through holes located in the front section of the elastic piece are gradually increased from back to front, and the areas of the through holes located in the rear section of the elastic piece are gradually increased from front to back, so that the rigidity of the elastic piece is gradually reduced from the middle to the two ends, meanwhile, the stability of the elastic piece structure is not excessively damaged, and the elastic piece is not prone to distortion and deformation. The utility model further relates to a boneless windshield wiper which adopts the boneless windshield wiper elastic piece.

Description

Technical Field

[0001] This utility model relates to a frameless wiper blade, and more particularly to a frameless wiper blade spring. Background Technology

[0002] Patent document CN216611149U proposes three frameless wiper blade structures, see paragraphs 0038 to 0042 of its specification and the accompanying drawings. One of the blade structures solves the problem of the wiper blade not fitting properly to the glass by opening a through hole in the steel blade, so that the rigidity of the steel blade gradually decreases from the middle to both ends.

[0003] This method of creating a continuous through hole in the steel sheet is unsuitable for frameless wiper springs that need to clamp and fix the wiper blade. Frameless wiper springs that need to clamp and fix the wiper blade generally come in two types: one has a narrow slit along its length in the middle of a steel sheet, within which the wiper blade is placed; the other uses two steel sheets to clamp the wiper blade. According to patent document CN216611149U... Figure 1 As shown, if through holes are made in the steel sheet, the part of the steel strip that is in direct contact with the wiper blade will be too thin and long, making it prone to twisting and deformation.

[0004] The inventor of this utility model believes that the idea of ​​reducing stiffness by opening through holes in the steel sheet is feasible, but the method of opening the holes needs to be adjusted. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a new frameless wiper blade spring structure, which adopts a different opening method from the patent document CN216611149U, so as to achieve the purpose of gradually reducing the stiffness of the spring from the middle to both ends, while ensuring the stability of the spring structure and preventing the spring from twisting and deforming.

[0006] To solve the above-mentioned technical problems, this utility model provides a frameless wiper blade spring, including a front section, a middle section, and a rear section distributed sequentially along the length of the spring. The front section and the rear section of the spring are provided with multiple through holes, which penetrate the spring along the thickness direction. The multiple through holes in the front section of the spring gradually increase in area from back to front, and the multiple through holes in the rear section of the spring gradually increase in area from front to back, so that the stiffness of the spring gradually decreases from the middle to both ends. At the same time, since there is no excessively long through hole, the spring does not contain thin and long steel bars (equivalent to this utility model replacing the long and large through hole in patent document CN216611149U with multiple shorter and smaller through holes), which will not excessively damage the stability of the spring structure, and the spring is not easy to twist and deform.

[0007] This utility model also provides a frameless wiper blade, which uses the frameless wiper blade spring provided by this utility model. Attached Figure Description

[0008] Figure 1 This is a top view of the frameless wiper blade spring of Embodiment 1 of this utility model;

[0009] Figure 2 This is an exploded view of the frameless windshield wiper according to Embodiment 1 of this utility model;

[0010] Figure 3 for Figure 2 A 3D view of the frameless windshield wiper shown;

[0011] Figure 4 for Figure 3 The image shows a 3D view of the frameless wiper blades with the guide strips concealed.

[0012] Figure 5 This is a top view of the frameless wiper blade spring of Embodiment 2 of this utility model;

[0013] Figure 6 This is a top view of the frameless wiper blade spring of Embodiment 3 of this utility model;

[0014] Figure 7 This is a top view of the frameless wiper blade spring of Embodiment 4 of this utility model. Detailed Implementation

[0015] The frameless wiper spring provided by this utility model includes a front section, a middle section, and a rear section distributed sequentially along the length of the spring. Both the front and rear sections of the spring have multiple through holes. The through holes in the front section gradually increase in area from back to front, and the through holes in the rear section gradually increase in area from front to back. This achieves the purpose of gradually decreasing the stiffness of the spring from the middle to both ends, while ensuring the stability of the spring structure and preventing twisting deformation. The through holes are preferably elliptical or rectangular in shape. The front section extends from the part of the spring used to connect with the wiper arm connector assembly forward, from the rear end of the first through hole to the front end of the last through hole; the rear section extends from the part of the spring used to connect with the wiper arm connector assembly backward, from the front end of the first through hole to the rear end of the last through hole; the middle section is the part between the front and rear sections, and the part of the spring used to connect with the wiper arm connector assembly is located in the middle section. To ensure good cooperation between the spring and the guide strip, the width of the front, middle, and rear sections of the spring is equal and does not change along the length of the spring.

[0016] For frameless wiper blades without a load-bearing joint, the frameless wiper blade spring provided by this utility model is preferably a one-piece structure (i.e., a slit along the length direction is opened in the middle of a steel sheet, and the wiper blade is placed in the slit, for example...). Figure 1 The frameless wiper blade spring 100a shown is a single piece of steel with a slit 1 along its length L in the middle. See [reference needed]. Figure 4The wiper blade 200 is inserted into the slit 1. Compared with the frameless wiper blade with a split structure (i.e., two steel plates holding the wiper blade), it is easier to achieve better structural symmetry. That is, the left and right halves of the frameless wiper blade have better consistency in curvature, which makes the wiper blade fit better with the car glass. Example 1

[0017] This embodiment provides a frameless wiper blade, see [link]. Figures 1 to 4 The frameless wiper includes a frameless wiper blade 100a, a wiper strip 200, a guide strip 300, and a wiper arm connector assembly 400. The wiper strip 200 is engaged in the slit 1 of the blade 100a, the guide strip 300 is engaged on the blade 100a, and the wiper arm connector assembly 400 is fixed in the middle section of the blade 100a.

[0018] The through holes 2a on the spring piece 100a are elliptical holes. The left and right halves of the spring piece 100a are located on either side of the slit 1, respectively. Six through holes 2a are provided on each of the left and right halves of the front section of the spring piece 100a, and six through holes 2a are provided on each of the left and right halves of the rear section of the spring piece 100a. The through holes 2a located on the left half of the spring piece 100a are positioned at the midpoint of the left half along the width direction W, and the through holes 2a located on the right half of the spring piece 100a are also positioned at the midpoint of the right half along the width direction W. The front and rear sections of the spring piece 100a are symmetrical about the midpoint. The through holes 2a closer to the midpoint of the spring piece 100a have a shorter major axis than minor axis, resulting in a smaller hole area. The distance G between the through holes 2a is uniform. The thickness of the spring piece 100a remains constant along its length direction L.

[0019] The major axis of the through hole 2a on the spring piece 100a is set along the length direction L of the spring piece. The longer the minor axis of the through hole 2a is, the shorter the major axis is, and the distance G between the through holes 2a is equal. Under the condition that the thickness of the spring piece 100a does not change along the length direction L, the stiffness of the spring piece 100a is greater the closer it is to the middle section of the spring piece 100a.

[0020] Those skilled in the art can change the shape of the through hole on the spring from elliptical to rectangular, that is, the width of the rectangle remains unchanged, and the length of the rectangular through hole is shorter closer to the middle section of the spring 100a (not shown in the figure). However, based on the analysis of the stress and the service life of the spring, when the through hole is elliptical, there will be no stress concentration caused by the four right angles of the rectangular through hole. Moreover, when the spring is scraped back and forth, it is easy to break near the four right angles, which affects the structural stability of the spring. Furthermore, the elliptical through hole is less likely to cause the spring to twist and deform.

[0021] The length D of the middle section of the frameless wiper blade provided by this utility model is preferably about half of the total length Q of the blade. It should not be too long or too short to avoid affecting the adhesion between the blade and the car glass. For the most common wipers used on car windshields, D = 0.5Q ± 50mm, and D ≥ 60mm. In the front and rear sections of the blade, the geometric center distance U between two adjacent through holes is between 5mm and 1.5 inches, and the distance G between two adjacent through holes is between 2mm and 6mm. "mm" is a unit of length, meaning millimeters. Example 2

[0022] This embodiment provides a frameless wiper blade, which differs from the frameless wiper blade provided in Embodiment 1 in the presence of through holes on the spring. See also Figure 5 Unlike the spring 100a in Embodiment 1, in this embodiment, the through hole 2b on the frameless wiper spring 100b is a rectangular hole, and the length of the through hole 2b is constant and the width is smaller as it gets closer to the middle section of the spring 100b. Of course, the through hole 2b can also be an elliptical through hole, that is, the major axis of each elliptical through hole is constant, and the minor axis of the elliptical through hole is smaller as it gets closer to the middle section of the spring 100b (not shown in the figure).

[0023] For spring sheets where all through holes are equally spaced along the length L of the spring sheet in the front and rear sections, the geometric center spacing U between two adjacent through holes is preferably an integer multiple of 0.5 inches, more preferably 0.5 inches or 1.0 inches, because the length difference between spring sheets of different specifications is generally 1.0 inch. Designing the geometric center spacing U to be a multiple of 0.5 inches makes the workload relatively small when producing spring sheets of different sizes. Example 3

[0024] This embodiment provides a frameless wiper blade, which differs from the frameless wiper blade provided in Embodiment 2 in the position of the spring and its through hole. See also Figure 6 Unlike the spring 100b in Embodiment 2, in this embodiment, the spring 100c does not have a slit for holding the wiper blade. The through hole 2c is located at the middle position of the spring 100c along the width direction W. This spring 100c is suitable for frameless wipers with a supporting tab. The through hole 2c can also be an elliptical or rectangular through hole with a constant length. The width of the through hole 2c decreases as it approaches the middle of the spring 100c. The basic structure of a frameless wiper with a supporting tab can be found in CN216467686U, and will not be described further here. Example 4

[0025] This embodiment provides a frameless wiper blade, which differs from the frameless wiper blade provided in Embodiment 3 in the presence of through holes on the spring. See also Figure 7The length and width of the through hole 2d are smaller the closer it is to the middle section of the spring piece 100d. It should be emphasized that the structural form of the through hole 2d is also applicable to the spring piece with slit 1 disclosed in Embodiment 1 and Embodiment 2, and it is not limited to the through hole being only a rectangular through hole; an elliptical through hole is also applicable.

[0026] The above embodiments and illustrations are not intended to limit the product form and style of the present invention. Any appropriate changes and modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A frameless wiper blade spring, comprising a front section, a middle section, and a rear section sequentially distributed along the length of the spring, characterized in that: The front and rear sections of the spring sheet are provided with multiple through holes extending along the thickness direction of the spring sheet. Along the length direction of the spring sheet, the through holes are arranged at intervals. The through holes (2a, 2b, 2c, 2d) located in the front section of the spring sheet have a gradually increasing hole area from back to front, and the through holes located in the rear section of the spring sheet have a gradually increasing hole area from front to back.

2. The frameless wiper blade spring as described in claim 1, characterized in that: The spring is a one-piece structure with equal widths in the front, middle and rear sections. A slit is formed on the spring along its length, located at the center line of the spring, for mounting the wiper blade. The through holes on the spring are distributed symmetrically about the slit.

3. The frameless wiper blade spring as described in claim 2, characterized in that: The slit is located on the left and right halves of the spring piece, respectively. The through hole on the left half of the spring piece is located at the middle position of the left half of the spring piece along the width direction, and the through hole on the right half of the spring piece is located at the middle position of the right half of the spring piece along the width direction.

4. The frameless wiper blade spring as described in claim 1, characterized in that: The spring sheet has an integrated structure in which the front, middle and rear sections of the spring sheet are of equal width, and the through hole is located at the middle position of the spring sheet along the width direction.

5. The frameless wiper spring as described in claim 3 or 4, characterized in that: The through hole is an elliptical hole or a rectangular hole; The length of the through hole is smaller closer to the middle of the spring piece, and the width of each through hole is equal; Alternatively, the width of the through hole is smaller closer to the middle of the spring piece, and the length of each through hole is equal; Alternatively, the length and width of the through hole are smaller the closer it is to the middle of the spring.

6. The frameless wiper blade spring as described in claim 5, characterized in that: The width of the through hole is smaller closer to the middle section of the spring piece. When the length of each through hole is equal, the through holes are evenly distributed along the length of the spring piece in the front and rear sections. The geometric center distance U between two adjacent through holes is an integer multiple of 0.5 inches.

7. The frameless wiper blade spring as described in claim 6, characterized in that: The geometric center spacing U between two adjacent through holes is 1.0 inch or 0.5 inch.

8. The frameless wiper blade spring as described in any one of claims 1 to 4, characterized in that: In the front and rear sections of the spring, the geometric center distance U between two adjacent through holes is between 5 mm and 2 inches, and the distance G between two adjacent through holes is between 2 mm and 6 mm.

9. The frameless wiper blade spring as described in claim 5, characterized in that: In the front and rear sections of the spring, the geometric center distance U between two adjacent through holes is between 5 mm and 2 inches, and the distance G between two adjacent through holes is between 2 mm and 6 mm.

10. The frameless wiper blade spring as described in any one of claims 1 to 4, characterized in that: The length of the middle section of the spring piece is D = 0.5Q ± 50 mm, where Q is the total length of the spring piece.

11. The frameless wiper blade spring as described in claim 5, characterized in that: The length of the middle section of the spring piece is D = 0.5Q ± 50 mm, where Q is the total length of the spring piece.

12. The frameless wiper blade spring as described in claim 6, characterized in that: The length of the middle section of the spring piece is D = 0.5Q ± 50 mm, where Q is the total length of the spring piece.

13. The frameless wiper blade spring as described in claim 7, characterized in that: The length of the middle section of the spring piece is D = 0.5Q ± 50 mm, where Q is the total length of the spring piece.

14. The frameless wiper blade spring as described in claim 8, characterized in that: The length of the middle section of the spring piece is D = 0.5Q ± 50 mm, where Q is the total length of the spring piece.

15. The frameless wiper blade spring as described in claim 9, characterized in that: The length of the middle section of the spring piece is D = 0.5Q ± 50 mm, where Q is the total length of the spring piece.

16. The frameless wiper blade spring as described in claim 10, characterized in that: The length D of the middle section of the spring is ≥ 60 mm.

17. The frameless wiper blade spring as described in claim 11, characterized in that: The length D of the middle section of the spring is ≥ 60 mm.

18. The frameless wiper blade spring as described in claim 12, characterized in that: The length D of the middle section of the spring is ≥ 60 mm.

19. The frameless wiper blade spring as described in claim 13, characterized in that: The length D of the middle section of the spring is ≥ 60 mm.

20. The frameless wiper blade spring as described in claim 14, characterized in that: The length D of the middle section of the spring is ≥ 60 mm.

21. The frameless wiper blade spring as described in claim 15, characterized in that: The length D of the middle section of the spring is ≥ 60 mm.

22. A frameless windshield wiper, characterized in that: Includes the frameless wiper blade as described in any one of claims 1 to 21.

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