Double-steel-sheet boneless windshield wiper

Abstract

According to the double-steel-sheet boneless windshield wiper, elastic steel sheets are fixed to a rubber strip through buckles, the two sides of a top plate of each buckle extend downwards to form elastic clamping jaws, and the lower ends of the elastic clamping jaws are bent to form clamping hooks; a first clamping groove is formed in the elastic steel sheet, a first clamping block is arranged in the sheath sliding groove and embedded into the first clamping groove, and a primary axial limiting structure of the sheath is formed; one end of a top plate of the buckle is bent upwards to form a barb, a sheath check block matched with the barb is arranged in an inner cavity of the sheath, and the sheath check block and the barb form a double axial limiting structure of the sheath. In addition, a clamping jaw check block is arranged in a second sliding groove in the side face of the rubber strip, a third clamping groove is formed between the clamping jaw check block and the closed end, and the clamping hook penetrates through the elastic steel sheet and then is clamped into the third clamping groove. According to the scheme, the sheath adopts the design of a dual axial limiting structure, so that the sheath can be effectively prevented from slipping outwards in the use process; after penetrating through the elastic steel sheet, the buckle is directly clamped into the third clamping groove in the rubber strip, the rubber strip is firmly fixed, the use reliability is improved, and the operation noise is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of windshield wipers, and in particular to a double-steel-plate frameless windshield wiper. Background Art

[0002] Compared with single-steel-plate boneless wipers, double-steel-plate boneless wipers further optimize the performance of wipers because they have side-pressure steel plates embedded on both sides of the rubber strip. For example, the force on both sides of the rubber strip can be more balanced, avoiding the problem of poor fitting in the middle caused by the weakening pressure of the elastic steel plate (back arch) after long-term use in traditional boneless wipers; the side-pressure steel plate supports the rubber strip, reducing the distortion or wavy wear of the rubber strip caused by ultraviolet rays and high temperature, thereby extending the service life.

[0003] Among them, Chinese utility model patent CN 221851871 U discloses a boneless wiper blade, in which a steel plate is fixedly mounted on the top of a rubber strip, a spoiler strip is clamped on the steel plate, and a plurality of paired fixing holes are provided on the steel plate. Fixing claws are fixed in each of the fixing holes and are clamped on both sides of the rubber strip. Flat wires are clamped on both the front and rear sides of the rubber strip, and two locking protrusions are provided on the outer side of the right end of the flat wire to cooperate with the fixing claws, and the fixing claws are axially limited by the locking protrusions. However, this solution has the following problems: First, the spoiler strip (sheath) in this solution is axially limited by the bayonet at the left and right ends of the steel sheet. Due to the thin thickness of the steel sheet, the small bayonet, the aging of the sheath, and the extreme temperature difference and frost accumulation, the bayonet limit failure may easily cause the spoiler strip to fall off.

[0004] Second, the fixed claw in this scheme is axially limited by the cam on the flat wire, and the fixed claw and the slide groove on the wiper strip are set for sliding fit. Taking into account the different thermal expansion and contraction coefficients between materials, a certain axial contraction gap usually needs to be reserved between the flat wire and the strip to avoid deformation of the wiper due to thermal expansion and contraction. As a result, the axial range of movement of the strip is large, and the strip moves back and forth when the wiper is working, causing loud noise. Summary of the Invention

[0005] In view of this, the present application provides a double-steel-sheet boneless wiper to solve the problem in the prior art that the spoiler strip (sheath) is easy to fall off and has high working noise.

[0006] The double steel plate boneless wiper provided in the present application comprises a rubber strip and an elastic steel plate arranged on the top surface of the rubber strip, a sheath is arranged on the elastic steel plate, and side pressure steel plates are respectively embedded on the two side surfaces of the rubber strip, and the two ends of the elastic steel plate are respectively fixed to the top surface of the rubber strip by buckles. The buckle includes a top plate, a side of the top surface of the top plate away from the center of the boneless wiper is bent upward to form a barb, two side edges of the top plate respectively extend downward to form elastic claws, and the lower ends of the two elastic claws are respectively bent relative to each other to form a hook; The two side edges of the end of the elastic steel sheet are respectively provided with a first card groove, and the two opposite inner walls of the inner cavity of the sheath are respectively provided with a sheath sliding groove, and a first clamping block adapted to the first card groove is provided in the sheath sliding groove. The elastic steel sheet is inserted into the sheath sliding groove, and the first clamping block is clamped into the first card groove, forming a first axial limiting structure of the sheath; A sheath stopper is provided on the top wall of the outer end of the inner cavity of the sheath, and the sheath stopper is provided corresponding to the barb. In the length direction, the first clamping block is located outside the buckle, and the sheath stopper and the barb are abutted against each other to form a double axial limiting structure of the sheath. The two side surfaces of the rubber strip are respectively provided with a first slide groove and a second slide groove from top to bottom, the two ends of the first slide groove and the second slide groove are closed, and the side pressure steel sheet is arranged in the first slide groove; the end of the second slide groove is also provided with a claw stopper, and a third slot is formed between the claw stopper and the closed end of the second slide groove, and the hook passes through the elastic steel sheet and is stuck in the third slot.

[0007] The above double-steel-plate boneless wiper has a double axial limiting structure on the sheath, which can effectively prevent the sheath from slipping outward, thereby improving reliability. In addition, the elastic claws on the buckle pass through the elastic steel sheet and are directly stuck in the third slot on the rubber strip. The rubber strip is not easy to loosen and is reliable to use.

[0008] In the above technical solution, preferably, second slots are provided on opposite sides of the end of the side pressure steel sheet, a second block matching the second slot is provided in the first slot, the side pressure steel sheet is inserted into the first slot, the second block is engaged in the second slot, a first reserved gap is provided between the second block and the side wall of the second slot, and a second reserved gap is provided between the hook and the side wall of the third slot, the second reserved gap being smaller than the first reserved gap. This design reduces the axial clearance of the rubber strip and reduces operating noise.

[0009] In the above technical solution, preferably, the end of the elastic steel sheet is provided with two strip holes running through the thickness direction thereof, the two strip holes are arranged side by side along the width direction of the elastic steel sheet, and the elastic claws are arranged in one-to-one correspondence with the two strip holes.

[0010] In the above technical solution, preferably, a first chamfer is provided at one end of the hook away from the center of the boneless wiper.

[0011] In the above technical solution, preferably, the end of the claw stopper facing the center of the boneless wiper is provided with a second chamfer.

[0012] In the technical scheme, preferably, side surfaces of the first clamping block and the sheath stopper towards the center of the boneless wiper are inclined surfaces.

[0013] In the technical scheme, preferably, the sheath stopper is a U-shaped block with an opening facing the center of the boneless wiper, which saves material and reduces weight.

[0014] In the technical scheme, preferably, the upper two ends of the rubber strip are wider than the middle part.

[0015] According to the technical scheme, the double-steel-sheet boneless wiper provided by the application solves the problems of the existing technology, i.e., the spoiler (sheath) is easy to fall off and the working noise is large. Compared with the existing technology, the application has the following beneficial effects: The first clamping block on the elastic steel sheet and the first clamping groove in the sheath sliding groove constitute a double axial limiting structure of the sheath, the sheath stopper on the top wall of the sheath inner cavity and the barb on the clasp constitute a double axial limiting structure of the sheath, the double axial limiting structure can effectively prevent the sheath from sliding outward, the elastic clamping claw on the clasp penetrates through the elastic steel sheet and is directly clamped in the third clamping groove on the rubber strip, the rubber strip is not easy to loosen, and the use is reliable. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the application or the technical schemes in the prior art, the drawings needed in the description of the embodiments of the application or the prior art will be briefly introduced and described below. Obviously, the drawings in the following description are only some embodiments of the application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0017] Figure 1 The schematic diagram of the double-steel-sheet boneless wiper provided by the application is shown in the figure. Figure 2 The schematic diagram of the double-steel-sheet boneless wiper provided by the application is shown in the figure. Figure 1 The side view of the double-steel-sheet boneless wiper is shown in the figure. Figure 3 The schematic diagram of the clasp in the application is shown in the figure. Figure 4 The schematic diagram of the clasp in the application is shown in the figure. Figure 3 The schematic diagram of the clasp in the application is shown in the figure. Figure 5 The exploded structural schematic diagram of the double-steel-sheet boneless wiper is shown in the figure. Figure 1 The exploded structural schematic diagram of the double-steel-sheet boneless wiper is shown in the figure. Figure 6 The exploded structural schematic diagram of the double-steel-sheet boneless wiper is shown in the figure. Figure 1 The exploded structural schematic diagram of the double-steel-sheet boneless wiper is shown in the figure. Figure 7 The sectional view of the double-steel-sheet boneless wiper is shown in the figure. Figure 1 Figure 8 ​A schematic diagram of the adhesive strip in this application; Figure 9 for Figure 8 AA section view in; Figure 10 for Figure 8 BB cross-section in; Figure 11 for Figure 2 Middle CC section (sheath hidden).

[0018] Figures 1-11 In the figure, the corresponding relationship between the parts is as follows: Rubber strip 10, elastic steel sheet 20, sheath 30, side pressure steel sheet 40, buckle 50; First slide groove 11, second slide groove 12, second clamping block 13, claw stopper 14, second chamfer 15, third clamping groove 16; Strip-shaped hole 21, first slot 22; Sheath slide 31, first clamping block 32, sheath stopper 33; Second card slot 41; Top plate 51 , elastic claw 52 , hook 53 , first chamfer 54 , barb 55 . DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings of the embodiments of the present application to clearly and completely describe the technical solutions of the embodiments of the present application. Obviously, the embodiments described below are only some of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0020] In order to more clearly explain and illustrate the technical solution and implementation method of the present application, several preferred specific embodiments for implementing the technical solution of the present application will be introduced below.

[0021] It should be noted that the directional terms "inside, outside," "front, back," and "left, right" used herein are based on the product's usage status. Obviously, the use of these directional terms does not limit the scope of protection of this solution.

[0022] In view of the fact that the double-steel-plate boneless wiper has a slender and centrally symmetrical structure, in order to clearly illustrate the specific structure of the double-steel-plate boneless wiper in this application, the drawings in the specification only capture a part of its end portion for representation.

[0023] like Figure 1 、 Figure 2As shown, the dual-steel blade frameless wiper provided in this application includes a rubber strip 10 and an elastic steel blade 20 disposed on the top surface of the rubber strip 10. A sheath 30 is clamped onto the elastic steel blade 20, and side pressure steel blades 40 are embedded on both sides of the rubber strip 10. The two ends of the elastic steel blade 20 are fixed to the top surface of the rubber strip 10 via buckles 50.

[0024] like Figure 3 、 Figure 4 As shown, the buckle 50 includes a top plate 51. The two side edges of the top plate 51 extend downward to form elastic claws 52. The lower ends of the two elastic claws 52 are bent toward each other to form hooks 53. The end of the hook 53 away from the center of the frameless wiper is provided with a first chamfer 54 to facilitate installation. The top surface of the top plate 51, away from the center of the frameless wiper, is bent upward to form a barb 55.

[0025] Recombination Figure 5 、 Figure 6 、 Figure 7 As shown, the end of the elastic steel sheet 20 is provided with two strip holes 21 that pass through the thickness direction thereof. The two strip holes 21 are arranged side by side along the width direction of the elastic steel sheet 20 and are arranged one-to-one corresponding to the elastic claws 52. The two elastic claws 52 of the buckle 50 pass through the two strip holes 21 on the elastic steel sheet 20 and are clamped on the rubber strip 10, thereby fixing the elastic steel sheet 20 on the top surface of the rubber strip 10.

[0026] The elastic steel sheet 20 is provided with first retaining grooves 22 on both sides of its end, and the sheath 30 has sheath grooves 31 on its two opposing inner walls. The sheath grooves 31 are adapted to the thickness of the elastic steel sheet 20. A first retaining block 32 adapted to the first retaining groove 22 is provided within the sheath groove 31. The elastic steel sheet 20 is inserted into the sheath groove 31, and the first retaining block 32 engages with the first retaining groove 22, forming a first axial retaining structure for the sheath 30. In this application, the axial direction refers to the longitudinal direction of the boneless wiper.

[0027] A sheath stopper 33 is provided on the top wall of the outer end of the inner cavity of the sheath 30. The sheath stopper 33 is a U-shaped block with its opening facing the center of the boneless wiper. The sheath stopper 33 is provided corresponding to the barb 55 on the buckle 50. In the length direction, the first block 32 is located on the outside of the buckle 50, and the two are spaced apart in the horizontal projection plane. After the sheath 30 is assembled, the sheath stopper 33 and the barb 55 are abutted against each other, forming a double axial limiting structure of the sheath 30. The sides of the first block 32 and the sheath stopper 33 facing the center of the boneless wiper are sloped surfaces, which facilitates the insertion of the sheath 30.

[0028] In existing designs, the sheath and the elastic steel sheet form an axially restraining structure solely through the first retaining block and the first retaining groove. Prolonged exposure to ultraviolet light, high temperatures, or chemicals (such as windshield washer fluid) can cause the sheath and first retaining block 32 to become brittle or shrink. Extreme temperature differences can also lead to significant differences in the expansion and deformation of the elastic steel sheet (metal) and the sheath (polymer material). In cold regions, frost can also occupy the space in the sheath's slideway. These issues can all potentially cause the sheath to fall off the elastic steel sheet.

[0029] In response to the above problems, in the present application, the sheath 30 adds a double limiting structure consisting of a hook 55 and a sheath stop block 33 on the basis of the single limiting structure formed by the first clamping block 32 and the first clamping groove 22. The double axial limiting structure can effectively prevent the sheath 30 from slipping outward, thereby improving reliability.

[0030] Recombination Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 The two sides of the rubber strip 10 are respectively provided with a first chute 11 and a second chute 12 from top to bottom. The ends of the first chute 11 and the second chute 12 are closed. The first chute 11 is adapted to the side pressure steel sheet 40. The two side pressure steel sheets 40 are respectively provided with a second clamping groove 41 on the opposite sides of the ends. The first chute 11 of the rubber strip 10 is provided with a second clamping block 13 that matches the second clamping groove 41. The side pressure steel sheet 40 is inserted into the first chute 11, and the second clamping block 13 is clamped into the second clamping groove 41, thereby achieving axial limitation of the side pressure steel sheet 40.

[0031] A claw stopper 14 is also provided at the end of the second chute 12 on the rubber strip 10. The end of the claw stopper 14 facing the center of the boneless wiper is provided with a second chamfer 15 to facilitate sliding installation of the rubber strip 10. A third slot 16 is formed between the claw stopper 14 and the closed end of the second chute 12. The hook 53 of the buckle 50 passes through the strip-shaped hole 21 in the elastic steel sheet 20 and is then engaged in the third slot 16. In the existing design, the buckle is fixed to the side pressure steel sheet 40 by the protrusion on the side of the side pressure steel sheet to perform axial limitation, which increases the complexity of the manufacturing process of the side pressure steel sheet and increases the manufacturing cost.

[0032] In addition, wipers work in high temperature, severe cold, rain and snow environments. Considering the different thermal expansion and contraction coefficients between materials, existing wiper products usually reserve a certain axial fit gap between the side pressure steel sheet and the rubber strip to avoid deformation of the wiper caused by thermal expansion and contraction, which affects the wiping effect.

[0033] Since the second slide groove on the buckle and the rubber strip in the existing design is a sliding setting, please refer to Figure 11As shown, in the conventional design, a first reserved gap S1 is provided between the second clamping block 13 on the rubber strip 10 and the sidewall of the second clamping groove 41 on the side pressure steel plate 40 to mitigate thermal expansion and contraction between the two. Because the existing design uses a retaining structure of a buckle and the side pressure steel plate 40, it is simplified to a fixed structure of the elastic steel plate and the side pressure steel plate 40. Therefore, the first axial movable distance between the rubber strip 10 and the elastic steel plate is equal to the first reserved gap S1.

[0034] In the present application, the hook 53 of the buckle 50 engages the third slot 16 on the rubber strip 10 to limit its position. A second reserved gap S2 is provided between the hook 53 and the side wall of the third slot 16. The second axial movable distance between the rubber strip 10 and the elastic steel sheet is equal to the second reserved gap S2. Because the length of the buckle 50 is much smaller than the length of the side pressure steel sheet 40, the second reserved gap S2 is much smaller than the first reserved gap S1, and the second axial movable distance between the rubber strip 10 and the elastic steel sheet is much smaller than the first axial movable distance. Therefore, the range of movement between the rubber strip 10 and the elastic steel sheet 20 in the present application is much smaller than that of existing designs, reducing the axial range of movement and reducing the noise generated during wiper operation.

[0035] like Figure 8 As shown, the width of the closed ends of the rubber strip 10 is greater than its mid-section. The elastic claws 52 are located inward of the closed ends of the rubber strip 10, and the outer surfaces of the elastic claws 52 do not protrude beyond the outer surfaces of the closed ends, thus protecting the elastic claws 52. Furthermore, the closed ends also serve as axial limiters for the elastic claws 52, further improving reliability. Furthermore, the mid-section width of the rubber strip 10 is smaller than the width of the closed ends, further facilitating the engagement of the elastic claws 52 into the third slot 16.

[0036] Based on the description of the above specific embodiments, the double-steel blade frameless wiper provided by this application has the following advantages compared with the prior art: First, the first clamping block on the elastic steel sheet and the first clamping groove in the sheath slide constitute a single axial limiting structure of the sheath, and the sheath stopper on the top wall of the sheath inner cavity and the barb on the buckle constitute a double axial limiting structure of the sheath. The double axial limiting structure can effectively prevent the sheath from slipping outward, thereby improving reliability.

[0037] Second, after the elastic claw on the buckle passes through the elastic steel sheet, it is directly clamped in the third slot on the rubber strip, so the rubber strip is not easy to loosen and is reliable to use.

[0038] Third, the second reserved gap S2 between the hook of the buckle and the third slot on the rubber strip is much smaller than the first reserved gap S1 between the second block on the rubber strip and the second slot on the side pressure steel sheet, which reduces the axial range of movement of the rubber strip and reduces the noise generated during operation.

[0039] Finally, it is to be understood that the term "including", "comprising", and variations thereof, as used herein, are intended to be open-ended and to mean that other elements can be included, not excluded. The terms "including" and / or "comprising", as used herein, specify the presence of stated features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. The use of the word "a" or "an" to describe an element of a process, method, article, or apparatus does not exclude the presence of more than one of that element.

[0040] The present application is not limited to the above-described best mode, and any person should know that structural changes made under the inspiration of the present application, any technical solutions with the same or similar to the present application, fall within the protection scope of the present application.

Claims

1. A double-steel blade boneless wiper, comprising a rubber strip and an elastic steel sheet arranged on the top surface of the rubber strip, a sheath arranged on the elastic steel sheet, side pressure steel sheets respectively embedded on the two side surfaces of the rubber strip, and the two ends of the elastic steel sheet respectively fixed to the top surface of the rubber strip by buckles, characterized in that: The buckle includes a top plate, a side of the top surface of the top plate away from the center of the boneless wiper is bent upward to form a barb, two side edges of the top plate respectively extend downward to form elastic claws, and the lower ends of the two elastic claws are respectively bent relative to each other to form a hook; The two side edges of the end of the elastic steel sheet are respectively provided with a first card groove, and the two opposite inner walls of the inner cavity of the sheath are respectively provided with a sheath sliding groove, and a first clamping block adapted to the first card groove is provided in the sheath sliding groove. The elastic steel sheet is inserted into the sheath sliding groove, and the first clamping block is clamped into the first card groove, forming a first axial limiting structure of the sheath; A sheath stopper is provided on the top wall of the outer end of the inner cavity of the sheath, and the sheath stopper is provided corresponding to the barb. In the length direction, the first clamping block is located outside the buckle, and the sheath stopper and the barb are abutted against each other to form a double axial limiting structure of the sheath. The two side surfaces of the rubber strip are respectively provided with a first slide groove and a second slide groove from top to bottom, the two ends of the first slide groove and the second slide groove are closed, and the side pressure steel sheet is arranged in the first slide groove; the end of the second slide groove is also provided with a claw stopper, and a third slot is formed between the claw stopper and the closed end of the second slide groove, and the hook passes through the elastic steel sheet and is stuck in the third slot.

2. The double steel blade boneless wiper according to claim 1, characterized in that: A second slot is provided on the opposite side edges of the end portion of the side pressure steel sheet, a second clamping block matching the second slot is provided in the first slide groove, the side pressure steel sheet is inserted into the first slide groove, the second clamping block is clamped into the second slot, a first reserved gap is provided between the second clamping block and the side wall of the second slot, a second reserved gap is provided between the hook and the side wall of the third slot, and the second reserved gap is smaller than the first reserved gap.

3. The double steel blade frameless wiper according to claim 1, characterized in that: The end of the elastic steel sheet is provided with two strip holes penetrating the thickness direction thereof. The two strip holes are arranged side by side along the width direction of the elastic steel sheet, and the elastic claws are arranged in one-to-one correspondence with the two strip holes.

4. The double steel blade frameless wiper according to claim 1, characterized in that: The end of the hook away from the center of the boneless wiper is provided with a first chamfer.

5. The double steel blade frameless wiper according to claim 1, characterized in that: One end of the claw stopper facing the center of the boneless wiper is provided with a second chamfer.

6. The double steel blade frameless wiper according to claim 1, characterized in that: The sides of the first clamping block and the sheath stopper facing the center of the boneless wiper are sloped surfaces.

7. The double steel blade frameless wiper according to claim 1, characterized in that: The sheath stopper is a U-shaped block, and the opening is arranged toward the center of the boneless wiper.

8. The double steel blade frameless wiper according to claim 1, characterized in that: The widths of the upper ends of the rubber strip are greater than the width of the middle portion.

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