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 through holes located in the front section of the elastic piece are gradually densified from back to front, and the through holes located in the rear section of the elastic piece are gradually densified 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 appendix. Figure 1 One type of spring structure solves the problem of the wiper blade not fitting properly against the glass by creating a through hole in the steel sheet, which makes the rigidity of the steel sheet gradually decrease from the middle to both ends.

[0003] Based on whether or not they have a supporting spring, frameless wipers can be divided into two categories. One type has a supporting spring, where the spring is a single, integrated steel sheet without a slit for holding the wiper blade. The other type does not have a supporting spring. Based on the way the wiper blade is held, they are further divided into two types: one type has a spring that is a component consisting of two steel sheets, with the wiper blade sandwiched between them; the other type has a single, integrated steel sheet with a central slit, where the wiper blade is held. For example… Figure 1 and 2 The frameless wiper shown includes a frameless wiper blade 100, 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 100, the guide strip 300 is engaged on the blade 100, and the wiper arm connector assembly 400 is fixed in the middle section of the blade 100.

[0004] The method of creating a continuous through hole in the steel sheet proposed in patent document CN216611149U is not suitable for use on frameless wiper blade springs that need to hold the wiper blade, because if the appendix of patent document CN216611149U is followed... 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.

[0005] 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. Summary of the Invention

[0006] 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.

[0007] To solve the above-mentioned technical problems, this utility model provides a frameless wiper blade spring, comprising a front section, a middle section, and a rear section distributed sequentially along the length of the spring. The key feature is that both the front and rear sections of the spring are provided with multiple through holes extending along the thickness of the spring. The through holes in the front section gradually become denser from back to front, and the through holes in the rear section gradually become denser from front to back, causing the spring stiffness to gradually decrease from the middle to both ends. Simultaneously, since there are no excessively long through holes that would result in the spring containing both thin and long steel strips (equivalent to this utility model replacing the long and large through holes in patent document CN216611149U with multiple shorter and smaller through holes (such as round holes)), the stability of the spring structure is not excessively compromised, and the spring is less prone to twisting and deformation.

[0008] In one embodiment, the front, middle, and rear sections of the spring are of equal width.

[0009] In one embodiment, the middle section of the spring is of equal width, and the front and rear sections are of equal width. The width of the middle section of the spring is greater than the width of the front section. There is a connecting section between the middle section and the front and rear sections. The connecting section can be a vertical transition from the middle section of the spring to the front and rear sections respectively, or a gradually narrowing inclined transition from the middle section of the spring to the front and rear sections respectively.

[0010] By setting connecting sections with varying widths, the stiffness of the spring can be gradually reduced from the middle to both ends, further reducing the contact gap between the spring and the windshield surface, and further improving the wiping quality of the wipers.

[0011] This utility model also provides a frameless wiper blade, which uses the frameless wiper blade spring provided by this utility model. Attached Figure Description

[0012] Figure 1 A stereoscopic view of an existing frameless windshield wiper;

[0013] Figure 2 for Figure 1 An exploded view of the frameless windshield wiper shown.

[0014] Figure 3 for Figure 2 The diagram shows the fit between the frameless wiper blade and the windshield of a car.

[0015] Figure 4 This is a top view of the frameless wiper blade spring of Embodiment 1 of this utility model;

[0016] Figure 5-1 for Figure 4 The diagram shows the fit between the frameless wiper blade and the car's windshield in an area with a large curvature.

[0017] Figure 5-2 for Figure 4 The diagram shows the fit between the frameless wiper blade and the car's windshield in a relatively flat area of ​​curvature.

[0018] Figure 6 This is a top view of the frameless wiper blade spring of Embodiment 2 of this utility model;

[0019] Figure 7 for Figure 6 The diagram shows the fit between the frameless wiper blade and the windshield of a car.

[0020] Figure 8 This is a top view of the frameless wiper blade spring of Embodiment 3 of this utility model;

[0021] Figure 9 This is a top view of the frameless wiper blade spring of Embodiment 4 of this utility model;

[0022] Figure 10 This is a top view of the frameless wiper blade spring of Embodiment 5 of this utility model;

[0023] Figure 11 This is a top view of the frameless wiper spring of Embodiment Six of this utility model;

[0024] Figure 12 This is a top view of the frameless wiper blade spring of Embodiment Seven of this utility model. Detailed Implementation

[0025] 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 are provided with multiple through holes. Preferably, the through holes are of uniform size and shape for ease of manufacturing. The through holes in the front section gradually become denser from back to front, and the through holes in the rear section gradually become denser 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 the spring from twisting or deforming. The shape of the through holes can be round, small square, small diamond, or other regular shapes that are conducive to laser punching. In the following embodiments, round holes are used as an example. The length of the middle section of the spring piece is D=0.5Q±50.0mm, where Q is the total length of the spring piece. More preferably, the length of the middle section of the spring piece is D≥60.0mm. The middle section is used to connect with the scraper arm joint assembly. A front section and a rear section are arranged on both sides of the middle section. The front section and the rear section defined in this utility model do not include the two end areas of the spring piece.

[0026] For frameless wipers without a load-bearing connector, where the rubber strip is directly inserted into the spring, the frameless wiper spring provided by this utility model is preferably an integrated structure. Compared with the split structure (i.e., two steel plates clamping the wiper rubber strip), it is easier to achieve better structural symmetry. That is, the left and right halves of the frameless wiper spring have better consistency in curvature, which makes the wiper rubber strip fit better with the car glass. Example 1

[0027] This embodiment provides a frameless wiper blade, which, except for the through holes in the wiper blade spring, has the same structure as... Figure 1 and 2 The existing wiper blades shown are identical, with the middle section, front section, and rear section all having the same width. See also... Figure 4 The frameless wiper blade 100a is mirror-symmetrical about the first center line I and also mirror-symmetrical about the second center line II. Multiple circular through holes 2a are formed on the blade 100a. The left and right halves of the blade 100a are located on either side of the slit 1, respectively. Multiple through holes 2a are distributed in a dotted pattern on the left and right halves of the front section of the blade 100a, and also in a dotted pattern on the left and right halves of the rear section of the blade 100a. The through holes 2a are sparser closer to the center of the blade 100a. The thickness of the blade 100a is along its length. L remains unchanged. Therefore, the closer to the middle section of the spring 100a, the greater its stiffness; the farther away from the middle section, the smaller its stiffness. Since the spring 100a is pre-compressed into an arched curve in the middle section, its radius of curvature is smallest in the middle section, and then gradually increases from the middle section towards the front and rear sections. Because the stiffness of the spring 100a decreases further away from the middle section in the front and rear sections, compared to conventional springs, the front and rear sections of the spring 100a can be pre-fabricated into curved arcs with smaller radii of curvature. (See [reference]). Figure 5-1 , and conventional Figure 3 In comparison, when the spring 100a scrapes the side of the windshield with a larger curvature, the spring 100a with through hole 2a in this embodiment has a better fit with the vehicle glass T than the existing spring 100. In particular, it solves the problem that the two ends of the spring 100a are too raised and the gap between the two ends of the spring 100a and the vehicle glass T is too large. At the same time, it avoids the problem of spring twisting and deformation caused by the long strip-shaped through hole as in CN216611149U.

[0028] 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, that is, D=0.5Q±50.0mm, and D≥60.0mm. In this way, the length of the middle section of the blade 100a is sufficient for assembling the wiper arm joint assembly. Example 2

[0029] This embodiment provides a frameless wiper blade, which differs from the frameless wiper blade provided in Embodiment 1 in that it has a spring clip. See also Figure 6 Unlike the spring 100a in Embodiment 1, in this embodiment, the middle section of the spring 100e forms a connecting segment between the front and rear sections. The front and rear sections of the spring 100e have the same width, and the middle section of the spring 100e has the same width, but the width of the middle section is greater than the width of the front / rear sections. The connecting segment gradually narrows from the middle section of the spring 100e towards the front and rear sections. The width W1 of the middle section of the spring 100e ranges from 12mm to 16mm. The difference between the width W1 of the middle section and the width W2 of the front section of the spring 100e ranges from 0.5mm to 3mm. More preferably, the difference between the width W1 of the middle section and the width W2 of the front section of the spring 100e ranges from 1mm to 3mm. The slope α ranges from 45° to 60°.

[0030] The biggest improvement of this embodiment compared to embodiment two is that there is a connecting section between the middle section and the front section, and between the middle section and the rear section. This reduces the unit force-bearing area in this region and increases the pushing force transmitted from the scraper arm per unit area. As a result, the spring 100e sinks at the connecting section, forming an additional force-bearing fulcrum, especially when the spring 100e scrapes a relatively flat area of ​​the vehicle glass T, such as... Figure 7 It forms two smaller arched portions G between the end and the additional force-bearing fulcrum, and between the additional force-bearing fulcrum and the force-bearing center point O (the center point of the middle section), respectively, which greatly reduces the gap between the arched portion of the spring piece 100e and the windshield surface. In contrast, in embodiment 1, as Figure 5-2 As shown, when the spring 100a scrapes the flatter area of ​​the car glass T, the end of the spring 100a and the center point of force O easily form two force fulcrums, so that the spring 100a forms an arched part G' between the end and the center point of force O. The adhesion effect between the spring 100e and the car glass T disclosed in this embodiment is further improved, which can greatly improve the cleanliness of the wiper. Example 3

[0031] This embodiment provides a frameless wiper blade, which differs from the frameless wiper blade provided in Embodiment 1 in that it has a spring piece, mainly in the way the through holes are opened. In this embodiment, the through holes 2b are not distributed in a dotted pattern, but the radius of the through holes 2b is increased, and they are arranged at linear intervals along the length of the spring piece 100b. Specifically, see [link to documentation]. Figure 8The center of the through hole 2b located on the left half of the spring piece 100b is positioned at the midpoint of the left half along the width direction of the spring piece 100b, and the center of the through hole 2b located on the right half of the spring piece 100b is positioned at the midpoint of the right half along the width direction of the spring piece 100b. The density of each through hole 2b is achieved by adjusting the spacing between each through hole 100b. The closer the through hole 2b is to the middle section, the larger the spacing between adjacent through holes 2b, and vice versa. Compared with Embodiment 1, this hole-opening method is easier to process and manufacture, and has a lower manufacturing cost. Example 4

[0032] This embodiment provides a frameless wiper blade, which differs from the frameless wiper blade provided in Embodiment 1 in the spring element. See [link / reference]. Figure 9 In this embodiment, the spring 100c does not have a slit for holding the wiper blade. The spring 100c is suitable for frameless wipers with a bearing plate. The basic structure of a frameless wiper with a bearing plate can be found in patent document CN216467686U, and will not be described again here. Example 5

[0033] This embodiment provides a frameless wiper blade, which differs from the frameless wiper blade provided in Embodiment 4 in the opening method of the spring piece. The density and arrangement rule of the opening can be referred to in Embodiment 3, and the various through holes 2b are arranged in a straight-line interval, such as... Figure 10 It reveals that three rows of through holes 2b are arranged at intervals along the length of the spring 100d at the front and rear sections respectively. Of course, this utility model does not exclude the possibility that if the radius of the through holes 2b is increased, only one row of through holes 2b is opened on the first center line of the spring 100d (not shown in the figure). Example 6

[0034] This embodiment provides a frameless wiper blade, which differs from the frameless wiper blade provided in Embodiment 2 in the opening method of the spring through hole, such as... Figure 11 The spring piece 100f forms a sloped connection section between the middle section and the front and rear sections respectively. However, the opening method of its through hole 2b is different from that of Embodiment 2. The opening method can be referred to Embodiment 3. Example 7

[0035] This embodiment provides a frameless wiper, which differs from the frameless wiper provided in Embodiment 4 in the connection method between the middle section of the spring and the front and rear sections respectively. That is, the connecting section of the spring 100g is vertically transitioned from the middle section of the spring 100g to the front and rear sections respectively, rather than being inclined. With this kind of connection, the through holes of the spring can also be arranged in a straight line along the length direction of the spring as disclosed in Embodiment 3 (not shown in the figure).

[0036] In summary, this utility model adjusts the stiffness of the spring by opening multiple through holes on the spring sheet and by arranging the density of the through holes. For example, a dotted distribution or a linear interval distribution can be used. The above embodiments and illustrations are not intended to limit the product form and style of this utility model. Any appropriate changes and modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A frameless wiper blade spring (100a, 100b, 100c, 100d, 100e, 100f, 100g), comprising a front section, a middle section, and a rear section sequentially distributed along the length direction (L) of the spring, characterized in that: Front and rear sections are respectively arranged on both sides of the middle section of the spring pieces (100a, 100b, 100c, 100d, 100e, 100f, 100g). Both the front and rear sections of the spring pieces (100a, 100b, 100c, 100d, 100e) are provided with multiple through holes (2a, 2b) that penetrate along the thickness direction of the spring pieces. The multiple through holes (2a, 2b) in the front section of the spring pieces (100a, 100b, 100c, 100d, 100e) gradually become denser from back to front, and the multiple through holes (2a, 2b) in the rear section of the spring pieces (100a, 100b, 100c, 100d, 100e) gradually become denser from front to back.

2. The frameless wiper blade spring (100a, 100b, 100c, 100d, 100e, 100f, 100g) as described in claim 1, characterized in that: Each of the through holes (2a, 2b) has the same shape and size.

3. The frameless wiper blade spring (100a, 100b) as described in claim 1, characterized in that: The spring sheet (100a, 100b) is an integral sheet structure, with a slit (1) for mounting the wiper blade (200) along the first center line. The two sides of the slit (1) on the spring sheet (100a, 100b) are the left and right halves of the spring sheet (100a, 100b), respectively. Each through hole (2a) is distributed in a dot-like pattern on the left and right halves of the spring piece and is mirror-symmetrically distributed along the first centerline (I1); Alternatively, the center of the through hole (2b) located on the left half of the spring piece (100b) is set at the middle position of the left half of the spring piece (100b) along the width direction (W), and the center of the through hole (2b) located on the right half of the spring piece (100b) is set at the middle position of the right half of the spring piece (100b) along the width direction (W), and each through hole (2b) is spaced apart along the length direction of the spring piece (100b).

4. The frameless wiper blade spring (100c, 100d) as described in claim 1, characterized in that: The spring clips (100c, 100d) are integral sheet structures; Each through hole (2a) is distributed in a dot-like pattern on the front and rear sections of the spring piece (100c); Alternatively, depending on the size of the through hole (2b), at least one row of through holes (2b) may be provided at intervals in the front and rear sections of the spring piece (100d) along the length direction of the spring piece (100d).

5. The frameless wiper blade spring (100a, 100b, 100c, 100d) as described in any one of claims 1 to 4, characterized in that: The front, middle, and rear sections of the spring clips (100a, 100b, 100c, 100d) have equal widths.

6. The frameless wiper blade spring (100e, 100f, 100g) as described in any one of claims 1 to 4, characterized in that: The middle section of each spring piece (100e, 100f, 100g) has a uniform width, and the front and rear sections have uniform widths. The width of the middle section of each spring piece (100e, 100f, 100g) is greater than the width of the front / rear sections. There is a connecting section between the middle section and the front and rear sections of each spring piece (100e, 100f, 100g). The connecting section can be a vertical transition from the middle section of the spring piece (100g) to the front and rear sections respectively, or a gradually narrowing inclined transition from the middle section of the spring piece (100e, 100f) to the front and rear sections respectively.

7. The frameless wiper blade spring (100e, 100f, 100g) as described in claim 6, characterized in that: The middle section width W1 of the spring sheet (100e, 100f, 100g) ranges from [12mm to 16mm], and the difference between the middle section width W1 and the front section width W2 of the spring sheet (100e, 100f, 100g) ranges from [0.5mm to 3mm].

8. The frameless wiper blade spring (100e, 100f, 100g) as described in claim 7, characterized in that: The width W1 of the middle section of the spring piece (100e, 100f, 100g) minus the width W2 of the front section of the spring piece ranges from [1mm to 3mm]. When the middle section of the spring piece (100e, 100f) gradually narrows towards the front and rear sections, the angle α formed by the slope ranges from [45° to 60°].

9. The frameless wiper blade spring (100a, 100b, 100c, 100d, 100e, 100f, 100g) as described in any one of claims 1-4 and 7-8, characterized in that: The spring pieces (100a, 100b, 100c, 100d, 100e, 100f, 100g) are mirror-symmetrical about the second centerline (I2), which runs along the left and right directions of the spring pieces (100a, 100b, 100c, 100d, 100e, 100f, 100g); the length D of the middle section of the spring pieces (100a, 100b, 100c, 100d, 100e, 100f, 100g) is 0.5Q ± 50.0 mm, where Q is the total length of the spring pieces (100a, 100b, 100c, 100d, 100e, 100f, 100g).

10. The frameless wiper blade spring (100a, 100b, 100c, 100d, 100e, 100f, 100g) as described in claim 5, characterized in that: The spring pieces (100a, 100b, 100c, 100d, 100e, 100f, 100g) are mirror-symmetrical about the second centerline (I2), which runs along the left and right directions of the spring pieces (100a, 100b, 100c, 100d, 100e, 100f, 100g); the length D of the middle section of the spring pieces (100a, 100b, 100c, 100d, 100e, 100f, 100g) is 0.5Q ± 50.0 mm, where Q is the total length of the spring pieces (100a, 100b, 100c, 100d, 100e, 100f, 100g).

11. The frameless wiper blade spring (100a, 100b, 100c, 100d, 100e, 100f, 100g) as described in claim 6, characterized in that: The spring pieces (100a, 100b, 100c, 100d, 100e, 100f, 100g) are mirror-symmetrical about the second centerline (I2), which runs along the left and right directions of the spring pieces (100a, 100b, 100c, 100d, 100e, 100f, 100g); the length D of the middle section of the spring pieces (100a, 100b, 100c, 100d, 100e, 100f, 100g) is 0.5Q ± 50.0 mm, where Q is the total length of the spring pieces (100a, 100b, 100c, 100d, 100e, 100f, 100g).

12. The frameless wiper blade spring (100a, 100b, 100c, 100d, 100e, 100f, 100g) as described in claim 9, characterized in that: The length D of the middle section of the spring clips (100a, 100b, 100c, 100d, 100e, 100f, 100g) is ≥60.0mm.

13. The frameless wiper blade spring (100a, 100b, 100c, 100d, 100e, 100f, 100g) as described in claim 10, characterized in that: The length D of the middle section of the spring clips (100a, 100b, 100c, 100d, 100e, 100f, 100g) is ≥60.0mm.

14. The frameless wiper blade spring (100a, 100b, 100c, 100d, 100e, 100f, 100g) as described in claim 11, characterized in that: The length D of the middle section of the spring clips (100a, 100b, 100c, 100d, 100e, 100f, 100g) is ≥60.0mm.

15. A frameless windshield wiper, characterized in that: Including frameless wiper blades (100a, 100b, 100c, 100d, 100e, 100f, 100g) as described in any one of claims 1 to 14.

Images