CN117536500A - Hidden door handle and connection structure of door handle and door panel beating - Google Patents

Abstract

The invention provides a hidden door handle and a connecting structure of a door handle and a door sheet metal, belonging to the technical field of automobile parts, and comprising the following components: the handle base is provided with a support seat, the support seat is provided with a deformable connecting support, the connecting support is in a pre-installation position under the support of the connecting support, the support seat can move in any one direction of a first direction and a second direction relative to the connecting support through the elastic deformation of the connecting support, and the first direction and the second direction are mutually perpendicular on a plane; the beneficial effects of the invention are as follows: the door handle can be finely adjusted in multiple directions, so that dimensional errors are eliminated, the handle on the handle base can be aligned with the handle hole on the door, the assembly difficulty is reduced, and the door handle is convenient to install.

Description

Hidden door handle and connection structure of door handle and door panel beating

Technical Field

The invention belongs to the technical field of automobile parts, and relates to a hidden type automobile door handle and a connecting structure of the door handle and an automobile door sheet metal.

Background

Along with the rapid development of the automobile industry, the more diversified the outline of the automobile door panel, the higher and higher the requirement on the installation and alignment of the automobile door handle, and the more diversified the handle patterns; the door handle is connected with the opponent on the door panel beating through the assembly structure to it can be accurately aimed at the handle hole on the door to require the door handle when the installation to ensure handle (handle), because there is certain error to the opponent on the door panel beating, so there is the deviation in handle and handle hole when the door handle is fixed on the door plant, leads to the door handle to counterpoint degree of difficulty to improve when assembling.

Disclosure of Invention

The invention aims at solving the problems in the prior art and provides a hidden type door handle and a connecting structure of the door handle and a door sheet metal.

The aim of the invention can be achieved by the following technical scheme: a concealed door handle comprising:

the handle base is provided with at least one support seat, the support seat is provided with a deformable connecting support, the connecting support is in a pre-installation position under the support of self rigidity, the support seat can move in any one direction of a first direction and a second direction relative to the connecting support through elastic deformation of the connecting support, the first direction is mutually perpendicular to the second direction on a plane, and the handle base is allowed to move relative to the connecting support when the connecting support is fixed.

Preferably, the connecting bracket comprises two elastic constraint parts, the two elastic constraint parts are respectively positioned at two sides of the bracket seat, the bracket seat is in abutting connection with the two elastic constraint parts, the two elastic constraint parts are used for constraining the connecting bracket and the bracket seat together through own rigidity, and the bracket seat can overcome the constraint of the elastic constraint parts to move in the first direction and/or the second direction.

Preferably, the elastic constraint part is provided with two deformable first elastic pieces, one elastic constraint part is in abutting connection with one side profile surface of the support seat, and the other elastic constraint part is in abutting connection with the other side profile surface of the support seat.

Preferably, when the bracket seat moves in the first direction, two first elastic sheets of one elastic constraint part are extruded and deformed by the bracket seat; when the support seat moves in the second direction, one first elastic piece of one elastic constraint part and one first elastic piece of the other elastic constraint part are extruded and deformed by the support seat.

Preferably, the elastic constraint part further has a deformable second elastic sheet, the second elastic sheet is in abutting connection with one end face of the support base, the support base can overcome the constraint of the second elastic sheet and move in a third direction, and the third direction is perpendicular to the plane where the first direction and the second direction are located.

Preferably, the connecting bracket further comprises a panel part, the two elastic constraint parts are fixedly connected with the panel part, and the panel part is provided with a connecting part for connecting with the sheet metal part.

Preferably, the connecting portion is provided with at least two expandable clamping legs, one end of each clamping leg is integrally connected with the panel portion, and each clamping leg can be expanded to form an expansion state.

Preferably, the support seat further comprises an adjusting nut, the support seat is provided with a threaded hole, the threaded hole is provided with an inner screw tooth, an outer screw tooth is arranged on the outer surface of the adjusting nut, the adjusting nut can be movably connected with the threaded hole along the third direction, the inner screw tooth is connected with the outer screw tooth, and the adjusting nut moves along the third direction when rotating.

Preferably, the adjusting nut is provided with a screw, the screw penetrates through the panel part and penetrates between the clamping legs so as to expand and open the clamping legs, and the clamping legs are tapped into an internal thread structure by the screw to clamp the screw.

A connection structure of a door handle and a door panel, comprising: the hidden door handle also comprises a sheet metal part, the panel part is attached to the surface of the sheet metal part, the sheet metal part is provided with a through hole, each clamping foot stretches into the through hole, and each clamping foot after expansion is clamped with the through hole so as to fixedly connect the connecting bracket with the sheet metal part, and the handle base is allowed to finely adjust and move when each clamping foot is fixed with the sheet metal part.

Compared with the prior art, the invention has the beneficial effects that:

1. the door handle can be finely adjusted in multiple directions, so that dimensional errors are eliminated, the handle on the handle base can be aligned with the handle hole on the door, the assembly difficulty is reduced, and the door handle is convenient to install.

2. If the position of the opponent on the door sheet metal is not deviated, the connecting bracket is kept at the pre-installation position under the action of the rigidity of the connecting bracket, so that the connecting bracket is directly connected with the opponent on the door sheet metal, and the handle on the handle base is just aligned with the handle hole on the door, so that the adjustment is not needed; when the opponent on the car door sheet metal has deviation, under the condition that the connecting bracket is connected with the opponent on the car door sheet metal, the handle base can be subjected to fine adjustment movement, so that the handle on the handle base is aligned with the handle hole on the car door, the connecting bracket can be positioned at a pre-installation position under the general condition, and the handle base can overcome the elastic constraint of the connecting bracket, so that the handle base can be subjected to fine adjustment in the first direction (X axis) and the second direction (Y axis), and the car door sheet metal door is quite convenient.

3. When the handle base moves leftwards, the two first elastic sheets of the elastic constraint part positioned at the left side are extruded and deformed by the bracket seat; when the handle base moves rightwards, the two first elastic sheets of the elastic constraint part positioned on the right side are extruded and deformed by the bracket seat; when the handle base moves upwards, the first elastic sheets of the two elastic constraint parts, which are positioned on the upper sides, are extruded and deformed by the bracket seat; when the handle base moves downwards, the first elastic sheets of the two elastic constraint parts, which are positioned at the lower sides, are extruded and deformed by the bracket seat; it should be noted that the movement direction of the handle base (bracket base) can be decomposed into components in the first direction and the second direction when it is moved in other directions.

4. When the connecting bracket is in the pre-installation position, the four first elastic sheets are in abutting connection with the bracket seat through the rigidity of the four first elastic sheets, so that the connecting bracket and the bracket seat are restrained together to keep relatively static.

5. When the connecting bracket is installed, the connecting bracket is connected with the sheet metal part, and the bracket seat can relatively move in the third direction through the deformation of the second elastic piece, so that the bracket seat is positioned at a proper position in the Z-axis direction, a certain gap exists between the bracket seat and the connecting bracket, the adjusting nut can move towards the panel part when rotating, the adjusting nut is in abutting connection with the panel part, and the gap between the bracket seat and the panel part in the Z-axis direction is eliminated.

Drawings

Fig. 1 is a schematic view of the structure of a hidden door handle of the present invention.

Fig. 2 is a schematic view of another view of the hidden door handle of the present invention.

Fig. 3 is a schematic structural diagram of an alignment assembly mechanism according to the present invention.

Fig. 4 is an exploded view of the alignment assembly mechanism of the present invention.

Fig. 5 is a schematic diagram of a connection structure of a door handle and a door panel of the present invention.

100, a handle base; 200. an alignment assembly mechanism; 300. a support seat; 310. a threaded hole; 400. a connecting bracket; 410. an elastic constraint part; 411. a first elastic sheet; 412. a second spring plate; 420. a panel section; 430. a clamping foot; 500. an adjusting nut; 600. a screw; 700. a sheet metal part; 710. and a through hole.

Detailed Description

The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1-5, a concealed door handle, comprising: the handle base 100, the handle base 100 is provided with at least one bracket base 300, the bracket base 300 is provided with a deformable connecting bracket 400, the connecting bracket 400 is in a pre-installation position under the support of the connecting bracket 400, the bracket base 300 can move relative to the connecting bracket 400 in any one direction of a first direction and a second direction through the elastic deformation of the connecting bracket 400, the first direction and the second direction are mutually perpendicular on a plane, and the handle base 100 is allowed to move relative to the connecting bracket 400 when the connecting bracket 400 is fixed.

The hidden door handle is actually a door handle assembly, the bracket base 300 and the connecting bracket 400 form an alignment assembly mechanism 200, and the handle base 100 is provided with a plurality of alignment assembly mechanisms 200; when the hidden door handle is installed on the door sheet metal, the hidden door handle is required to be connected with the door sheet metal through the connecting bracket 400 of each alignment assembly mechanism 200, and the handle base 100 can move within a certain range to eliminate dimensional errors in all directions during installation, ensure that the handle on the handle base 100 is aligned with the handle hole on the door, and then fix the door.

It should be noted that the first direction, the second direction, and the third direction are the X-axis, the Y-axis, and the Z-axis, respectively, and the stand 300 (the handle base 100) can be adjusted in the X-axis and the Y-axis, and the connection stand 400 has a certain elasticity, so that the stand 300 is allowed to move within the maximum elastic deformation range of the connection stand 400, that is, the stand 300 obtains a space allowance for moving in each direction by deforming the connection stand 400; under the condition that the connecting bracket 400 is not subjected to external force or is only subjected to self gravity, the connecting bracket 400 is kept relatively static relative to the bracket seat 300 through the rigidity of the connecting bracket 400, and the connecting bracket 400 is restrained at a pre-installation position in the state, so that the connecting bracket 400 cannot move when being connected with the opponent of the door sheet metal, and the connecting bracket 400 is convenient to be connected with the opponent.

It should be noted that, in the existing hidden door handle and door panel, at least two alignment assembly mechanisms 200 need to be disposed to connect with the opponent (through hole 710) on the door panel, and there may be a deviation in the position of the opponent on the door panel, which may cause the handle base 100 to be unable to align with the handle hole on the door after the handle is installed.

For the above reasons, the link bracket 400 itself on the hidden door handle is provided in a deformable structure, which means that the bracket base 300 can be moved in the X-axis as well as the Y-axis against the elastic constraint of the link bracket 400. If the position of the opponent on the door sheet metal is not deviated, the connecting bracket 400 is kept at the pre-installation position under the action of the rigidity of the connecting bracket 400, the connecting bracket 400 can be directly connected with the opponent on the door sheet metal, and the handle on the handle base 100 is just aligned with the handle hole on the door, so that adjustment is not needed; when the opponent on the door sheet metal is deviated, under the condition that the connecting bracket 400 is connected with the opponent on the door sheet metal, the handle base 100 can be subjected to fine adjustment movement, so that the handle on the handle base 100 is aligned with the handle hole on the door and then fixed, thus the connecting bracket 400 can be positioned at a pre-installation position under the general condition, and the handle base 100 can overcome the elastic constraint of the connecting bracket 400 to move in the first direction (X axis) and the second direction (Y axis) for fine adjustment, and the automobile door sheet metal is quite convenient.

As shown in fig. 1 to 4, the connection bracket 400 includes two elastic constraining portions 410, the two elastic constraining portions 410 are respectively located at two sides of the bracket base 300, the bracket base 300 is in abutting connection with the two elastic constraining portions 410, the two elastic constraining portions 410 constrain the connection bracket 400 and the bracket base 300 together through their own rigidity, and the bracket base 300 can move in the first direction and/or the second direction against the constraint of the elastic constraining portions 410.

The rigidity of the elastic constraint part 410 is low, and the elastic constraint part 410 can deform when an external force is applied, so that the elastic constraint part 410 can be supported on the bracket base 300 by a certain rigidity, thereby keeping the connecting bracket 400 at the pre-installation position, and avoiding that the connecting bracket 400 cannot be aligned with the opponent due to movement; once the holder 300 is moved by an external force, the elastic constraining portions 410 are capable of being deformed to allow the holder 300 to move, and the two elastic constraining portions 410 are designed to just constrain the holder 300 to move up, down, left, and right (i.e., move in Y-axis and X-axis directions), at least one of the two elastic constraining portions 410 is deformed to be pressed to allow the holder 300 to move up, down, left, and right when the holder 300 is subjected to a certain external force.

On the basis of the above embodiment, the elastic constraint portion 410 has two deformable first elastic pieces 411, the two first elastic pieces 411 of one elastic constraint portion 410 are in abutting connection with one side profile of the support base 300 and the two first elastic pieces 411 of the other elastic constraint portion 410 are in abutting connection with the other side profile of the support base 300.

On the basis of the above embodiment, when the bracket base 300 moves in the first direction, two first elastic sheets 411 of one elastic constraint part 410 are pressed and deformed by the bracket base 300; when the bracket base 300 moves in the second direction, one first elastic piece 411 of one elastic constraint part 410 and one first elastic piece 411 of the other elastic constraint part 410 are deformed by the bracket base 300.

The bracket base 300 has two degrees of freedom (i.e., moves left or right) in a first direction and also has two degrees of freedom (moves up or down) in a second direction; when the handle base 100 moves to the left, the two first elastic pieces 411 of the elastic constraint part 410 located at the left side are deformed by the bracket base 300; when the handle base 100 moves rightward, the two first elastic pieces 411 of the elastic constraint portion 410 located on the right side are deformed by the stand 300; when the handle base 100 moves upward, the first elastic pieces 411 of the two elastic constraint portions 410 located on the upper side are deformed by the stand 300; when the handle base 100 moves downward, the first elastic pieces 411 of the two elastic constraint parts 410 located at the lower sides are deformed by the bracket base 300; it should be noted that, when the handle base 100 (the holder base 300) moves in other directions, the movement direction thereof may be decomposed into components in the first direction and the second direction.

When the connecting bracket 400 is in the pre-installation position, the four first elastic pieces 411 are in abutting connection with the bracket base 300 through the rigidity of the four first elastic pieces, so that the connecting bracket 400 and the bracket base 300 are restrained together to keep relatively static.

As shown in fig. 3 to 4, based on the above embodiment, the elastic constraint portion 410 further has a deformable second elastic piece 412, where the second elastic piece 412 is in abutting connection with an end surface of the support base 300, and the support base 300 can move in a third direction against the constraint of the second elastic piece 412, and the third direction is perpendicular to the plane where the first direction and the second direction are located.

The third direction is the Z-axis direction, and the purpose of the movement of the bracket base 300 in the third direction is to adjust the position of the pull handle base 100 in the Z-axis direction, and when the connecting bracket 400 is connected to the sheet metal part 700, the second elastic piece 412 may deform to allow the bracket base 300 to adjust and move in the third direction.

As shown in fig. 1 to 5, the connecting bracket 400 further includes a panel part 420, and both elastic constraint parts 410 are fixedly connected to the panel part 420, and the panel part 420 is provided with a connection part for connecting with the sheet metal part 700. The connecting portion is used for connecting with an opponent on the sheet metal part 700.

On the basis of the above embodiment, the connection portion is provided as at least two expandable clip legs 430, one end of each clip leg 430 is integrally connected with the panel portion 420, and each clip leg 430 can be expanded to form an expanded state.

In this embodiment, each clip leg 430 forms an expansion screw sleeve structure, each clip leg 430 can pass through the through hole 710 on the sheet metal part 700 in the closed state, when each clip leg 430 passes through the through hole 710, the panel part 420 is attached to the sheet metal part 700, the screw 600 is screwed in to prop up each clip leg 430 so as to expand it, and each clip leg 430 after expansion catches the through hole 710, so that the connecting bracket 400 is fixed with the sheet metal part 700.

On the basis of the above embodiment, the adjusting nut 500 is further included, the bracket base 300 is provided with a threaded hole 310, the threaded hole 310 is provided with an inner screw thread, the outer surface of the adjusting nut 500 is provided with an outer screw thread, the adjusting nut 500 is movably connected with the threaded hole 310 along a third direction, the inner screw thread is connected with the outer screw thread, and the adjusting nut 500 moves along the third direction when rotating.

In the present embodiment, since the adjustment nut 500 is connected with the bracket base 300 through the screw structure, the adjustment nut 500 may be moved in the third direction by rotation to eliminate the gap between the bracket base 300 and the panel part 420; during installation, as the connecting bracket 400 is connected with the sheet metal part 700, the bracket base 300 can relatively move in the third direction through the deformation of the second elastic sheet 412, so that the bracket base 300 is at a proper position in the Z-axis direction, a certain gap exists between the bracket base 300 and the connecting bracket 400, the adjusting nut 500 can move towards the panel part 420 during rotation, the adjusting nut 500 is in abutting connection with the panel part 420, and the gap between the bracket base 300 and the panel part 420 in the Z-axis direction is eliminated.

On the basis of the above embodiment, the adjustment nut 500 is mounted with the screw 600, the screw 600 passes through the panel part 420 and penetrates between the respective clamping legs 430 to expand the respective clamping legs 430 to be spread, and the respective clamping legs 430 are tapped into the internal thread structure by the screw 600 to clamp the screw 600.

In this embodiment, the adjusting nut 500 has a hole body larger than the diameter of the shaft portion of the screw 600, and the head portion of the screw 600 is in abutting connection with the adjusting nut 500, so that the adjusting nut 500 is pressed against the panel portion 420, and the shaft portion of the screw 600 is radially adjustable through the hole body of the adjusting nut 500, so that the bracket base 300 and the adjusting nut 500 are allowed to move in the X-axis direction or the Y-axis direction with respect to the connecting bracket 400. When the connection bracket 400 is connected to the sheet metal member 700, a gap exists between the bracket base 300 and the panel part 420 in the Z-axis direction, and the adjustment nut 500 rotates and moves toward the connection bracket 400 as the screw 600 is screwed, thereby eliminating the gap in the Z-axis direction.

1-5, on the basis of the above embodiment, a connection structure of a door handle and a door panel, includes: the hidden door handle further comprises a sheet metal part 700, the panel part 420 is attached to the surface of the sheet metal part 700, the sheet metal part 700 is provided with through holes 710, each clamping foot 430 stretches into each through hole 710, each clamping foot 430 after expanding and expanding clamps the through holes 710, so that the connecting bracket 400 is fixedly connected with the sheet metal part 700, and the handle base 100 is allowed to finely adjust and move when each clamping foot 430 is fixed with the sheet metal part 700.

The mounting process and principle of the hidden car door handle are as follows: connecting the connecting brackets 400 on each alignment assembly mechanism 200 with each through hole 710 on the sheet metal part 700, namely inserting each clamping leg 430 on the connecting bracket 400 into each through hole 710, and after each connecting bracket 400 is fixed, if the through holes 710 have no deviation, the handles on the handle base 100 are just aligned with the handle holes, so that the handle base 100 does not need to be adjusted; fine-tuning the position of the handle base 100 (i.e., moving the holder 300 in at least one of the first and second directions) if there is a deviation in the through-hole 710; after the above steps are completed, the screw 600 is screwed into the adjusting nut 500, the screw 600 passes through the panel part 420 and penetrates into each of the clamping legs 430, the screw 600 penetrates into each of the clamping legs 430 to self-tap the screw structure to be fixed with each of the clamping legs 430, in the process, the adjusting nut 500 advances in the third direction until being in abutting connection with the panel part 420 of the connecting bracket 400, thereby eliminating the gap between the bracket base 300 and the panel part 420 in the Z-axis direction, and simultaneously each of the clamping legs 430 is propped open to clamp the through hole 710, thereby fixing the handle base 100 with the sheet metal part 700 through the connecting bracket 400.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to herein as "first," "second," "a," and the like are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (10)

1. A concealed door handle, comprising:

handle base (100), handle base (100) is provided with at least one support seat (300), flexible linking bridge (400) is installed to support seat (300), linking bridge (400) are in the pre-installation position under self rigid support, support seat (300) can be through elastic deformation of linking bridge (400) is in the arbitrary direction in first direction and second direction for linking bridge (400), first direction with the second direction is mutually perpendicular on a plane, handle base (100) is permitted for linking bridge (400) are removed when linking bridge (400) are fixed.

2. A concealed door handle as set forth in claim 1, wherein: the connecting support (400) comprises two elastic constraint parts (410), the two elastic constraint parts (410) are respectively located at two sides of the support base (300), the support base (300) is in abutting connection with the two elastic constraint parts (410), the two elastic constraint parts (410) are used for constraining the connecting support (400) and the support base (300) together through own rigidity, and the support base (300) can overcome the constraint of the elastic constraint parts (410) to move in the first direction and/or the second direction.

3. A concealed door handle as set forth in claim 2, wherein: the elastic constraint part (410) is provided with two deformable first elastic sheets (411), the two first elastic sheets (411) of one elastic constraint part (410) are in abutting connection with one side profile surface of the bracket seat (300), and the two first elastic sheets (411) of the other elastic constraint part (410) are in abutting connection with the other side profile surface of the bracket seat (300).

4. A concealed door handle as set forth in claim 3, wherein: when the bracket seat (300) moves in the first direction, two first elastic sheets (411) of one elastic constraint part (410) are extruded and deformed by the bracket seat (300); when the bracket seat (300) moves in the second direction, one first elastic sheet (411) of one elastic constraint part (410) and one first elastic sheet (411) of the other elastic constraint part (410) are extruded and deformed by the bracket seat (300).

5. A concealed door handle as set forth in claim 3, wherein: the elastic constraint part (410) is further provided with a deformable second elastic sheet (412), the second elastic sheet (412) is in abutting connection with one end face of the support base (300), the support base (300) can overcome the constraint of the second elastic sheet (412) to move in a third direction, and the third direction is perpendicular to the plane where the first direction and the second direction are located.

6. A concealed door handle as set forth in claim 5, wherein: the connecting bracket (400) further comprises panel parts (420), the two elastic constraint parts (410) are fixedly connected with the panel parts (420), and the panel parts (420) are provided with connecting parts for connecting with sheet metal parts (700).

7. A concealed door handle as set forth in claim 6, wherein: the connecting part is provided with at least two expandable clamping legs (430), one end of each clamping leg (430) is integrally connected with the panel part (420), and each clamping leg (430) can be expanded to form an expansion state.

8. A concealed door handle as set forth in claim 7, wherein: still include adjusting nut (500), threaded hole (310) have been seted up to support seat (300), threaded hole (310) have interior thread, the surface of adjusting nut (500) sets up outer thread, adjusting nut (500) can follow third direction remove ground with threaded hole (310) are connected, and interior thread with outer thread is connected, adjusting nut (500) are rotated the time along third direction removes.

9. A concealed vehicle door handle as set forth in claim 8, wherein: the adjusting nut (500) is provided with a screw (600), the screw (600) penetrates through the panel part (420) and penetrates between the clamping legs (430) so as to expand and open the clamping legs (430), and the clamping legs (430) are tapped by the screw (600) to clamp the screw (600).

10. The utility model provides a connection structure of door handle and door panel beating which characterized in that includes: the concealed door handle according to any one of claims 1 to 9, further comprising a sheet metal part (700), the panel part (420) is in surface-to-surface contact with the sheet metal part (700), the sheet metal part (700) is provided with a through hole (710), each clamping leg (430) extends into the through hole (710), and each clamping leg (430) after expansion and expansion clamps the through hole (710) so as to fixedly connect the connecting bracket (400) with the sheet metal part (700), and the handle base (100) is allowed to finely adjust when each clamping leg (430) is fixed with the sheet metal part (700).