Supporting assembly suitable for boneless windshield wiper and boneless windshield wiper

Abstract

The utility model relates to a supporting assembly suitable for a boneless windshield wiper and the boneless windshield wiper. An elastic supporting piece of the supporting assembly is of an integrated structure and is arranged in a fixing base in a penetrating mode in the front-back direction, the upper surface of the elastic supporting piece is provided with one or two rigid protruding parts, then two first limiting faces arranged in the front-back direction at intervals are formed, the fixing base is provided with at least one elastic cantilever part, and when the elastic supporting piece penetrates into the fixing base, the elastic supporting piece is fixed to the fixing base. The free end of the elastic cantilever part is jacked up by the corresponding rigid convex part to give way to the corresponding rigid convex part, the fixed seat is further provided with two second limiting surfaces which are arranged at intervals in the front-back direction, at least one second limiting surface is arranged at the free end of the elastic cantilever part, and the second limiting surfaces correspond to the first limiting surfaces one to one; the two second limiting faces and the two first limiting faces are jointly used for preventing the elastic supporting piece from moving relative to the fixing base in the front-back direction. The boneless windshield wiper with the supporting assembly is compact and stable in structure and good in wiping quality.

Description

Technical Field

[0001] The utility model relates to a supporting component suitable for a frameless windshield wiper and also relates to a frameless windshield wiper. Background Art

[0002] Patent document CN108583517B discloses an elastic support component for a wiper, which is inserted into a first C-shaped groove of a bearing clamp. A positioning spring is provided on the upper surface of the elastic support component for the wiper, and a limit block is provided on the positioning spring. The limit block is used to limit the movement of the elastic support component for the wiper relative to the wiper joint base along the length direction of the wiper.

[0003] On the one hand, the existence of the positioning spring causes the increase of the thickness of the wiper elastic support component in this section. To ensure that the wiper elastic support component can smoothly penetrate into the first C-shaped groove, the dimension of the first C-shaped groove along the thickness direction of the wiper elastic support component needs to be increased accordingly, resulting in a decrease in the fit between the other sections of the wiper elastic support component and the first C-shaped groove. Ultimately, when the wiper is wiping, the wiper elastic support component will shake relative to the bearing splint, thereby affecting the wiping quality of the wiper rubber strip.

[0004] On the other hand, the additional processing and assembly of the positioning spring leads to an increase in the production cost of the wiper. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a support assembly suitable for a frameless wiper, so that the frameless wiper adopting the support assembly has a more compact and stable structure compared with the wiper recorded in the above patent document.

[0006] In order to solve the above technical problems, the utility model improves the structure of the wiper elastic support component and the wiper joint base. The support assembly provided by the utility model includes an elastic support sheet and a fixed seat, the elastic support sheet is an integrated structure, and is arranged in the fixed seat along the front-to-back direction, the upper surface of the elastic support sheet has one or two rigid protrusions, and then the side surfaces of the one or two rigid protrusions form two first limiting surfaces spaced apart in the front-to-back direction, the fixed seat has at least one elastic cantilever portion, when the elastic support sheet penetrates into the fixed seat, the free end of the elastic cantilever portion is lifted up by the corresponding rigid protrusion to give way to the corresponding rigid protrusion, and the inner side of the fixed seat also has two second limiting surfaces spaced apart in the front-to-back direction, at least one second limiting surface is arranged on the free end of the elastic cantilever portion, the second limiting surface corresponds to the first limiting surface one by one, and the corresponding second limiting surface is arranged opposite to the first limiting surface, so that the two second limiting surfaces and the two first limiting surfaces are used together to prevent the elastic support sheet from moving relative to the fixed seat along the front-to-back direction.

[0007] The utility model also provides a boneless wiper adopting the supporting assembly.

[0008] The elastic support sheet of the above-mentioned support assembly is an integrated structure. When it is inserted into the fixed seat directly (referring to directly inserting into the fixed seat) or indirectly (referring to inserting into the fixed seat along with the bearing clip), the elastic cantilever portion on the fixed seat can give way to the rigid convex portion on the elastic support sheet, and realize the stable connection between the elastic support sheet and the fixed seat through the mutual limitation between the relatively arranged first limiting surface and the second limiting surface. At the same time, since the setting of the positioning spring sheet is omitted, the processing technology is simplified, resulting in a reduction in the production cost of the wiper. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0010] Figure 1A This is a structural diagram of a boneless wiper according to Embodiment 1 of the present utility model;

[0011] Figure 1B for Figure 1A An exploded view of the boneless wiper shown;

[0012] FIG1 is a schematic diagram of the assembly of the C-position load-bearing clamping plate (with a notch) with the elastic support sheet and the scraper strip;

[0013] Figure 2 for Figure 1A The structural diagram of the boneless wiper with the end buckle, connecting assembly and wiper arm hidden;

[0014] Figure 3A for Figure 2 The structural diagram of the fixing seat, the elastic supporting sheet and the load-bearing clamping plate shown; Figure 3B for Figure 3A The structural diagram of the fixing seat shown; Figure 3C for Figure 3A The structural diagram of the elastic support sheet and the load-bearing splint shown; Figure 3D for Figure 3A A cross-sectional view of the fixing seat, the elastic support sheet and the load-bearing clamping plate shown;

[0015] Figure 3E This is a structural diagram of a fixing seat, an elastic supporting sheet and a load-bearing clamping plate in one embodiment of the utility model; Figure 3F for Figure 3E A cross-sectional view of the fixing seat, the elastic support sheet and the load-bearing clamping plate shown;

[0016] Figure 4A This is a structural diagram of a fixing seat, an elastic supporting sheet and a bearing clamping plate of a second embodiment of the utility model; Figure 4B for Figure 4A The structural diagram of the fixing seat shown; Figure 4C for Figure 4A The structural diagram of the elastic support sheet and the load-bearing splint shown; Figure 4D for Figure 4A A cross-sectional view of the fixing seat, the elastic support sheet and the load-bearing clamping plate shown;

[0017] Figure 5A This is a structural diagram of a fixing seat, an elastic supporting sheet and a bearing clamping plate of a third embodiment of the utility model; Figure 5B for Figure 5A The structural diagram of the fixing seat shown; Figure 5C for Figure 5A A cross-sectional view of the fixing seat, the elastic support sheet and the load-bearing clamping plate shown;

[0018] Fig. 6A This is a structural diagram of a fixing seat, an elastic supporting sheet and a bearing clamping plate of a fourth embodiment of the utility model; Figure 6B for Fig. 6A The structural diagram of the fixing seat shown; Figure 6C for Fig. 6A The structural diagram of the elastic support sheet and the load-bearing splint shown; Fig.6D for Fig. 6A A cross-sectional view of the fixing seat, the elastic support sheet and the load-bearing clamping plate shown;

[0019] Fig. 6E This is a structural diagram of a fixing seat, an elastic supporting sheet and a load-bearing clamping plate in one embodiment of the utility model. DETAILED DESCRIPTION Embodiment 1

[0020] See also Figure 1A , 1B In this embodiment, the boneless wiper provided by the utility model includes a support assembly, two guide strips 2, two end buckles 3, a scraper strip 4, a bearing splint 5, a connecting assembly 7 and a scraper arm 8, and the support assembly includes a fixing seat 1a and an elastic support sheet 6a. Figure 2 The upper and lower sides of the bearing clamp plate 5 are respectively provided with a first slot 51 and a second slot 52, the elastic support sheet 6a and the scraper strip 4 are respectively inserted into the first slot 51 and the second slot 52 along the front-to-back direction, and the structure of the first slot 51 and the second slot 52 is consistent with the structure of the first C-shaped slot and the second C-shaped slot disclosed in CN108583517A. It should be emphasized that the top of the first slot 51 is provided with an opening 511 along the front-to-back direction, and the width of the opening 511 must be at least greater than or equal to the width of the rigid protrusion 61a of the elastic support sheet 6a; two side wings 53 extend outward along the width direction between the first slot 51 and the second slot 52, see Figure 3B The fixing seat 1a has a slide groove 14 for passing the two side wings 53 of the bearing clamp plate 5. The bearing clamp plate 5 is inserted in the guide strip 2 and the fixing seat 1a along the front-back direction. The two end buckles 3 are respectively inserted at the front and rear ends of the bearing clamp plate 5. The guide strip 2 is fixed between the corresponding end buckles 3 and the fixing seat 1a. The scraper arm 8 is connected to the fixing seat 1a through the connecting component 7. In this embodiment, Figure 1B As shown, the connecting assembly 7 is detachably connected to the fixing seat 1a. In other embodiments of the present invention, the connecting assembly and the fixing seat may also be other structures, and the connecting assembly may be integrally connected to the fixing seat; it should be noted that the assembly method of the bearing clamp 5 and the fixing seat 1a is not only to insert the two side wings 53 of the bearing clamp 5 into the slide groove 14, such as Figure 1c , which discloses a design scheme in which the bearing splint 5' does not have side wings, by forming notches 53 on both sides of the bearing splint 5' and at positions relative to the two slide grooves 14 of the fixing seat 1a, the notches 53 and the corresponding slide grooves 14 of the fixing seat 1a give way to each other, and then the bearing splint 5' is assembled from bottom to top to the bottom of the fixing seat 1a, and the elastic support sheet 6a is sequentially inserted into the first slot 51 of the bearing splint 5' and the slide groove 14 of the fixing seat 1a (not shown in the figure), so that the assembly between the bearing splint 5' and the fixing seat 1a can be achieved.

[0021] The difference between this embodiment and the prior art lies in the connection structure between the elastic support sheet 6a and the fixing seat 1a. Figures 3A to 3D In this embodiment, the elastic support sheet 6a is a steel sheet of an integrated structure, and the steel sheet has a certain curvature. The upper surface of the elastic support sheet 6a has two rigid protrusions 61a, thereby forming two first limit surfaces P1a spaced apart in the front-to-back direction. The fixed seat 1a has two elastic cantilever parts 11a, and the elastic cantilever parts 11a are elastic. When an upward force is applied to the free end thereof, the free end can be displaced upward. After the upward force is removed, the free end is reset downward to the original position. The free end of the elastic cantilever part 1a has a downward projection 111a. When the elastic support sheet 6a penetrates into the fixed seat 1a, the projection 111a is lifted up by the corresponding rigid protrusion 61a and gives way to the corresponding rigid protrusion 61a.

[0022] The fixing seat 1a also has two second limiting surfaces P2a spaced apart in the front-to-back direction, each of which is provided on the protrusion 111a, and the second limiting surfaces P2a correspond to the first limiting surfaces P1a one-to-one, and the two second limiting surfaces P2a and the two first limiting surfaces P1a are used together to prevent the elastic support sheet 6a from moving relative to the fixing seat 1a in the front-to-back direction. In the front-to-back direction, the two second limiting surfaces P2a are located between the two first limiting surfaces P1a, and a cantilever guide surface S1a is provided on the rigid protrusion 61a, which is used to guide the rigid protrusion 61a to lift the protrusion 111a when the elastic support sheet 6a penetrates into the fixing seat 1a. In other embodiments of the present invention, the elastic cantilever portion can eliminate the setting of the protrusion 111a. For example, the elastic cantilever portion is designed to have a structure with a certain downward bending arc, so that the free end of the elastic cantilever portion extends to the bottom of the fixed seat, and the second limiting surface is set on the free end of the elastic cantilever portion (not shown).

[0023] In this embodiment, two elastic cantilever parts 11a are formed on the fixing seat 1a, and the upper protrusions 111a of the free ends of the two elastic cantilever parts 11a are respectively provided with second limiting surfaces P2a on the end surfaces facing the outer sides, so that the two second limiting surfaces P2a are arranged opposite to each other. The rigid protrusion 61a is an upwardly tilted flap directly stamped on the elastic support sheet 6a, and the upwardly tilted ends of the two flaps 61a are arranged opposite to each other. The upper surface of the flap 61a forms a cantilever guide surface S1a, and the upwardly tilted end of the flap 61a forms a vertical end surface, which is constructed as the first limiting surface P1a. Through the above arrangement, the longitudinal cross-sections of the two cantilever guide surfaces S1a of the two rigid protrusions 61a are in the shape of " / \", so that the two first limiting surfaces P1a are arranged opposite to each other.

[0024] See also Figure 3D Taking the elastic support sheet 6a as an example, when it is inserted into the fixing seat 1a from the back to the front, since the elastic support sheet 6a has strong rigidity, the rigid protrusion 61a will not be significantly deformed when it is squeezed by external force. Therefore, when the elastic support sheet 6a is inserted into the fixing seat 1a, the upper surface of the elastic support sheet 6a will not interfere with the protrusion 111a of the elastic cantilever part 11a. When the cantilever guide surface S1a of the rigid protrusion 61a (front end) located on the insertion end side of the elastic support sheet 6a successively abuts against the protrusions 111a on the free ends of the two elastic cantilever parts 11a, the elastic support sheet 6a is driven to move. The two elastic cantilever parts 11a are elastically deformed upward to make way until the first limiting surface P1a of the rigid protrusion 61 (rear end) on the other side abuts against the second limiting surface P2a of the corresponding elastic cantilever part 11a (rear end). At this time, the first limiting surface P1a of the rigid protrusion 61a at the front end is also exactly opposite to the second limiting surface P2a of the elastic cantilever part 11a at the front end. The mutual abutment and limiting between the two first limiting surfaces P1a and the corresponding two second limiting surfaces P2a completes the assembly between the elastic support sheet 6a and the fixed seat 1a.

[0025] In this embodiment, since both rigid protrusions 61a have cantilever guide surfaces S1a, the elastic support sheet 6a can be inserted into the fixing seat 1a from any end. In other embodiments of the utility model, the elastic support sheet 6a may have only one rigid protrusion with a cantilever guide surface, but with such a configuration, the elastic support sheet 6a can only be inserted into the fixing seat 1a from a specific end, and the rigid protrusion with the cantilever guide surface is preferentially abutted against the free end of the elastic cantilever portion, and the cantilever guide surface of the rigid protrusion is used to lift up the free end (protrusion) of the elastic cantilever portion, thereby achieving assembly between the elastic support sheet and the fixing seat 1a (not shown).

[0026] In other embodiments of the present invention, the fixing seat may also be provided with only one elastic cantilever portion 11e, see Figure 3E and3F The lower surface of the elastic cantilever portion 11e has a downward protrusion 111e, and the front and rear side surfaces of the protrusion 111e are two second limiting surfaces P2e respectively. The two rigid protrusions 61a opened by the elastic support plate both have a cantilever guide surface S1a and a first limiting surface P1a, so the elastic support plate can be assembled with the fixing seat from front to back and from back to front. Embodiment 2

[0027] See also Figures 4A to 4D The difference between this embodiment and the first embodiment is that, in this embodiment, in the front-to-back direction, the two first limiting surfaces P1b are located between the two second limiting surfaces P2b, and a convex guide surface S2b is provided on the free end of the elastic cantilever portion 11b. The convex guide surface S2b is used to guide the free end of the elastic cantilever portion 11b by lifting the rigid convex portion 61b when the elastic supporting sheet 6b penetrates into the fixing seat 1b.

[0028] In this embodiment, the elastic cantilever portion 11b is formed on the fixed seat 1b, and the free end of the elastic cantilever portion 11b has a downward convex block 111b, and the outer end surface of the convex block 111b is designed as an inclined surface inclined inward from top to bottom, and the inclined surface is defined as the convex guide surface S2b, and the inner end surface of the convex block 111b is a vertical surface, and the vertical surface is defined as the second limiting surface P2b. The free ends of the two elastic cantilever portions 11b are arranged opposite to each other, one facing forward and the other facing backward. The elastic support sheet 6b is provided with two rigid convex portions 61b, and each rigid convex portion 61b is a folded piece directly stamped and formed on the elastic support sheet 6b, so that the upturned ends of the two folded pieces 61b are arranged opposite to each other, that is, the longitudinal cross-sections of the two rigid convex portions 61b are in the shape of "\ / ", and the upturned ends of the folded pieces 61b form a vertical end surface, and the vertical end surface is constructed as the first limiting surface P1b.

[0029] See also Figure 4D Taking the elastic support sheet 6b passing through the fixing seat 1b from back to front as an example, the upper surface of the elastic support sheet 6b will not interfere with the protrusion 111b of the elastic cantilever portion 11. When the two rigid protrusions 61b successively abut against the protrusion guide surfaces S2b of the protrusion 111b of the elastic cantilever portion 11b located on the rear side of the fixing seat 1b, the protrusion 111b (free end) of the elastic cantilever portion 11b is driven to be pushed upward until the first limiting surfaces P1b of the two rigid protrusions 61b are respectively opposite to the two second limiting surfaces P2b of the two elastic cantilever portions 11b, thereby realizing the assembly of the elastic support sheet 6b and the fixing seat 1b. Embodiment 3

[0030] See also Figures 5A to 5CThe difference between this embodiment and the second embodiment is that, in this embodiment, the number of elastic cantilever parts 11b is only one, a first limiting part 12 is provided on the fixed seat 1c, two rigid protrusions 61b are located between the first limiting part 12 and the elastic cantilever part 11b, and a second limiting surface P2c is provided on each of the first limiting part 12 and the elastic cantilever part 11b.

[0031] In this embodiment, the elastic cantilever portion 11 b is formed on the fixing seat 1 c , a second limiting surface P2 c is disposed on the front side of the protrusion 111 b , and another second limiting surface P2 c is disposed on the rear side of the first limiting portion 12 .

[0032] See also Figure 5C In this embodiment, the elastic support sheet 6b can only be assembled to the fixing seat 1c from a specific direction. As shown in the figure, the direction of insertion can only be from the back to the front. When the elastic support sheet 6b is inserted into the fixing seat 1c, the front rigid protrusion 61b abuts against the protrusion guide surface S2b of the protrusion 111b of the elastic cantilever portion 11b. Under the guidance of the protrusion guide surface S2b and the force of the elastic support sheet 6b, the protrusion 111b is pulled from the inside by the front rigid protrusion 61b. The front rigid protrusion 61b is pushed up from the inside (i.e. the rear side of the protrusion 111b), and after the front rigid protrusion 61b passes under the protrusion 111b, the free end of the elastic cantilever portion 11b is reset downward. Thereafter, the protrusion guide surface S2b of the protrusion 111b is pushed up from the inside (i.e. the rear side of the protrusion 111b) by the rear rigid protrusion 61b, and after the rear rigid protrusion 61b passes under the protrusion 111b, the free end of the elastic cantilever portion 11b is reset downward to its original position, thereby completing the sheet penetration.

[0033] Taking into account that the entire wiper bracket assembly (including the elastic support sheet 6b, the wiper rubber strip 4 and the bearing splint 5 [if any]) tends to move outward relative to the fixed seat 1c under the action of centrifugal force when the wiper is wiping, it is preferred that the first limiting portion 12 on the fixed seat 1c and the upturned end of the rigid protrusion 61b of the elastic support sheet 6b abut against each other for limiting. Because the first limiting portion 12 is rigidly connected to the fixed seat 1c, compared with the elastic cantilever portion 11b, it has a better mechanical support structure, can better improve the stability and service life of the connection between the elastic support sheet 6b and the fixed seat 1c, and is more conducive to stable wiping of the wiper. Embodiment 4

[0034] See also Figures 6A to 6DThe difference between this embodiment and any of the above embodiments is that, in this embodiment, the number of the elastic cantilever part 11d is only one, the number of the rigid protrusion 61d is also only one, the elastic cantilever part 11d has a protrusion guide surface S2d, and the rigid protrusion 61d does not have a cantilever guide surface. A plug hole 13d is provided on the fixed seat 1d corresponding to the rigid protrusion 61d, and the rigid protrusion 61d is inserted into the plug hole 13d. The front side wall and the rear side wall of the plug hole 13d are two second limiting surfaces P2d, and the front side surface and the rear side surface of the rigid protrusion 61d are two first limiting surfaces P1d.

[0035] In the present embodiment, the elastic cantilever portion 11d is formed on the fixing seat 1d and is located at the rear side of the rigid protrusion 61d. The free end of the elastic cantilever portion 11d has a downwardly facing protrusion 111d, the protrusion guide surface S2d is arranged on the rear side of the protrusion 111d, and the rear side wall of the jack 13d is arranged on the front side of the protrusion 111d. In other embodiments of the present utility model, the rear side wall area of ​​the jack can also be larger than the front side of the protrusion 111d, so that only part of the rear side wall of the jack is arranged on the protrusion 111d. The rigid protrusion 61d is formed on the elastic support sheet 6d and is a cylindrical protrusion. It has good fault tolerance for the angle error between the elastic support sheet 6d and the fixing seat 1d when the sheet is inserted. In other embodiments of the present utility model, the rigid protrusion 61d can also be other shapes and / or sizes.

[0036] See also Fig.6D In this embodiment, since only the rear side of the insertion hole 13d is provided with the elastic cantilever part 11d, the direction of inserting the sheet can only be from the back to the front. In other embodiments of the utility model, an elastic cantilever part with a convex guide surface can be provided on the front and rear sides of the insertion hole, and the front side wall and the rear side wall of the insertion hole are respectively provided entirely / partially on the two elastic cantilever parts, so that the sheet can be inserted from the front to the back and from the back to the front. For example, Fig. 6E As shown, an elastic cantilever portion 11f having a convex guide surface is respectively provided on the front and rear sides of the insertion hole 13f.

[0037] In this embodiment, when the elastic support sheet 6d is inserted into the fixing seat 1d, the rigid protrusion 61d abuts against the protrusion guide surface S2d, and under the guidance of the protrusion guide surface S2d and the force of the elastic support sheet 6d, the free end protrusion of the elastic cantilever portion 11d is lifted up from the inside (i.e., the rear side of the free end protrusion of the elastic cantilever portion 11d) by the rigid protrusion 61d, and after the rigid protrusion 61d passes under the free end protrusion of the elastic cantilever portion 11d, it is inserted into the insertion hole 13d, and the free end of the elastic cantilever portion 11d is reset downward to its original position, completing the insertion.

[0038] The purpose of defining the front-to-back direction and the up-down direction in this document is only to facilitate the description of the relative positional relationship of various parts and has no other purpose.

[0039] The utility model is not limited to the above-mentioned wiper structure, and is also applicable to frameless wipers of other structures, such as the frameless wiper described in patent document CN217099907U, which does not have a bearing splint, and the elastic support sheet is directly inserted into the fixing seat. As long as the connection structure between the elastic support sheet and the fixing seat provided by the utility model is adopted, it belongs to the scope of the utility model.

Claims

1. A support assembly suitable for a boneless wiper, comprising an elastic support sheet (6a, 6b, 6d) and a fixing seat (1a, 1b, 1c, 1d), wherein the elastic support sheet (6a, 6b, 6d) is an integrated structure and is inserted into the fixing seat (1a, 1b, 1c, 1d) along the front-rear direction, characterized in that: The upper surface of the elastic support sheet (6a, 6b, 6d) has one or two rigid protrusions (61a, 61b, 61d), and the side surfaces of the one or two rigid protrusions (61a, 61b, 61d) form two first limiting surfaces (P1a, P1b, P1d) spaced apart in the front-to-back direction. The fixing seat (1a, 1b, 1c, 1d) has at least one elastic cantilever portion (11a, 11b, 11d, 11e, 11f). When the elastic support sheet (6a, 6b, 6d) penetrates into the fixing seat (1a, 1b, 1c, 1d), the free end of the elastic cantilever portion (11a, 11b, 11d, 11e, 11f) is only lifted by the corresponding rigid protrusion (61a, 61b, 61d) to support the corresponding rigid protrusion (61a, 61b, 61d). To achieve the giving way effect, the inner side of the fixed seat (1a, 1b, 1c, 1d) also has two second limiting surfaces (P2a, P2b, P2c, P2d) arranged at intervals along the front-to-back direction, at least one second limiting surface (P2a, P2b, P2c, P2d) is arranged on the free end of the elastic cantilever part (11a, 11b, 11d, 11e, 11f), and the second limiting surfaces (P2a, P2b, P2c, P2d) are arranged one by one opposite to the first limiting surfaces (P1a, P1b, P1d), so that the two second limiting surfaces (P2a, P2b, P2c, P2d) and the two first limiting surfaces (P1a, P1b, P1d) are used together to prevent the elastic support sheet (6a, 6b, 6d) from moving relative to the fixed seat (1a, 1b, 1c, 1d) along the front-to-back direction.

2. The support assembly according to claim 1, characterized in that The free end of the elastic cantilever part (11a, 11b, 11d, 11e, 11f) has a downward convex block (111a, 111b, 111d, 111e), and when the elastic support sheet (6a, 6b, 6d) penetrates into the fixing seat (1a, 1b, 1c, 1d), the convex block (111a, 111b, 111d, 111e) is lifted up by the corresponding rigid convex part (61a, 61b, 61d) to give way to the corresponding rigid convex part (61a, 61b, 61d), and the second limiting surface (P2a, P2b, P2c, P2d) is arranged on the convex block (111a, 111b, 111d, 111e).

3. The support assembly according to claim 2, characterized in that: In the front-to-back direction, the two first limiting surfaces (P1b, P1d) are located between the two second limiting surfaces (P2b, P2c, P2d), and at least one of the protrusions (111b, 111d) is provided with a protrusion guide surface (S2b, S2d). The protrusion guide surface (S2b, S2d) is used to guide the rigid protrusion (61b, 61d) to lift up the elastic cantilever portion (11b, 11d, 11f) when the elastic support sheet (6b, 6d) penetrates into the fixing seat (1b, 1c, 1d).

4. The support assembly according to claim 3, characterized in that: The number of rigid protrusions (61b) is two, the number of elastic cantilever parts (11b) is two, in the front-to-back direction, the two rigid protrusions (61b) are located between the two protrusions (111b), the two side surfaces of the two rigid protrusions (61b) arranged opposite to each other are two first limiting surfaces (P1b), the protrusion (111b) has a second limiting surface (P2b) and a protrusion guide surface (S2b), and the second limiting surface (P2b) is located between the first limiting surface (P1b) and the protrusion guide surface (S2b).

5. The support assembly according to claim 3, characterized in that: The number of rigid protrusions (61b) is two, the number of elastic cantilever parts (11b) is one, a first limiting part (12) protruding downward is provided on the inner side of the fixed seat (1c), the two rigid protrusions (61b) are located between the first limiting part (12) and the elastic cantilever part (11b), the two side surfaces of the two rigid protrusions (61b) arranged opposite to each other are two first limiting surfaces (P1b), and the two side surfaces of the first limiting part (12) and the protrusion (111b) arranged facing each other are two second limiting surfaces (P2c).

6. The support assembly according to claim 4 or 5, characterized in that: The rigid protrusion (61b) is a folding piece directly formed on the elastic support piece (6b) by stamping, and the folding piece has an upturned end. The upturned ends of the two folding pieces are arranged back to back, and the end surface of the upturned end of the folding piece is the first limiting surface (P1b).

7. The support assembly according to claim 3, characterized in that: The number of rigid protrusions (61d) is one, a plug hole (13d, 13f) is provided on the fixed seat (1d) corresponding to the rigid protrusion (61d), the rigid protrusion (61d) is inserted into the plug hole (13d, 13f), the front side wall and the rear side wall of the plug hole (13d, 13f) are two second limiting surfaces (P2d), and the front side surface and the rear side surface of the rigid protrusion (61d) are two first limiting surfaces (P1d); and an elastic cantilever portion (11d, 11f) is provided on the front side and / or the rear side of the plug hole (13d, 13f).

8. The support assembly according to claim 7, characterized in that The rigid protrusion (61d) is a cylindrical protrusion formed on the elastic support sheet (6d) by stamping or welding.

9. The support assembly according to claim 2, characterized in that: In the front-to-back direction, the two second limiting surfaces (P2a, P2e) are located between the two first limiting surfaces (P1a), and at least one rigid protrusion (61a) is provided with a cantilever guide surface (S1a). The cantilever guide surface (S1a) is used to abut against the protrusion (111a, 111e) when the elastic support sheet (6a) penetrates into the fixing seat (1a), thereby guiding the rigid protrusion (61a) to lift up the elastic cantilever portion (11a, 11e).

10. The support assembly according to claim 9, characterized in that The number of rigid protrusions (61a) is two, the number of elastic cantilever parts (11a) is two, in the front-to-back direction, the two protrusions (111a) are located between the two rigid protrusions (61a), the two side surfaces of the two rigid protrusions (61a) that are arranged opposite to each other are two first limiting surfaces (P1a), the two side surfaces of the two protrusions (111a) that are arranged opposite to each other are two second limiting surfaces (P2a), and the upper surface of the rigid protrusion (61a) is a cantilever guide surface (S1a).

11. The support assembly according to claim 9, characterized in that The number of rigid protrusions (61a) is two, the number of elastic cantilever parts (11e) is one, the side surfaces of the protrusions (111e) of the elastic cantilever parts (11e) arranged opposite to each other are two second limiting surfaces (P2e); the two side surfaces of the two rigid protrusions (61a) arranged facing each other are two first limiting surfaces (P1a), and the upper surface of the rigid protrusions (61a) is a cantilever guide surface (S1a).

12. The support assembly according to claim 10 or 11, characterized in that: The rigid protrusion (61a) is a folding piece directly formed on the elastic support sheet (6a, 6e) by stamping, the folding piece has an upturned end, the upturned ends of the two folding pieces are arranged facing each other, the upper surface of the folding piece is a cantilever guide surface (S1a), the two cantilever guide surfaces (S1a) form a " / \"-shaped structure, and the end surface of the upturned end of the sheet body is a first limiting surface (P1a).

13. A boneless wiper, characterized in that: The frameless wiper comprises a support assembly as claimed in any one of claims 1 to 12.

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