CN115217378A - Rotary upturning type hidden door handle - Google Patents

Abstract

The invention relates to a rotary upturning type hidden door handle which comprises a shell, a handle body, a driving shaft and a swing arm, wherein a sunken hand nest area is arranged below the handle body, a rotary leg extends above the handle body, the rotary leg is rotationally connected with the shell, the rotary axis of the rotary leg is consistent with the vehicle length direction, a reset elastic piece is arranged between the rotary leg and the shell, when the handle body is in a closed state, the handle body is hidden in a vehicle door under the action of the reset elastic piece, and the outer surface of the handle body is flush with the outer surface of the vehicle door; the drive shaft is connected and driven by actuating mechanism with the casing rotation, and the drive shaft is parallel with the axis of rotation of rotatory leg, and the swing arm is established and is driven the handle body and outwards rotate and turn over on the drive shaft, exposes in the casing and be in the state of stretching out until the hand nest district, and the manual outside pulling handle body in rethread hand nest district, triggers the door lock switch until the handle body and is in the trigger state, resets when swing arm counter-rotation, and the handle body hides to reset in the door under the effect of the elastic component that resets.

Description

Rotary upturning type hidden door handle

Technical Field

The invention belongs to the technical field of automobile door handles, and particularly relates to a rotary upturning type hidden door handle.

Background

At present, automobile door handles are basically divided into hidden door handles and non-hidden door handles, the hidden door handles do not damage the integrity of the surface of an automobile door, reduce wind resistance and wind noise, make the automobile door more attractive and can build grade feeling, so that more and more automobiles adopt the hidden door handles.

The hidden door handle needs a motor to drive a handle to pop out, and the existing hidden door handle has the disadvantages of complex structure, more parts, large size and high cost; and in low-temperature rain and snow weather, the door handle is very easy to freeze and cannot be opened, one circle of the hidden door handle is frozen, and no force application point is used for ice breaking.

Disclosure of Invention

In order to solve the problems of complex structure, multiple parts and large size of the electric hidden door handle in the prior art, the invention provides a rotary upturning type hidden door handle.

In order to solve the technical problems, the technical scheme adopted by the invention is that the rotary upturning type hidden door handle comprises a shell, a handle body, a driving shaft, a swing arm and a driving mechanism, wherein a recessed hand nest area is arranged below the handle body, a rotary leg extends above the handle body and is rotatably connected with the shell, the rotary axis of the rotary leg is consistent with the vehicle length direction, a reset elastic piece is arranged between the rotary leg and the shell, when the handle body is in a closed state, the rotary upturning type hidden door handle is hidden in a vehicle door under the action of the reset elastic piece, and the outer surface of the handle body is flush with the outer surface of the vehicle door; a vehicle door lock switch is arranged on the shell;

the driving shaft is rotatably connected with the shell, the driving shaft and the rotating axes of the rotating legs are arranged in parallel, the driving mechanism is in transmission connection with the driving shaft, the swing arm is arranged on the driving shaft and used for driving the handle body to rotate outwards and turn upwards until the hand nest area is exposed out of the shell and is in an extending state, the handle body is manually pulled outwards through the hand nest area until the handle body triggers the car door lock switch to be in a triggering state, and when the driving mechanism drives the driving shaft and the swing arm to rotate reversely and reset, the handle body is hidden in the car door to reset under the action of the reset elastic piece.

Preferably, the area of the shell, which is opposite to the rotating leg, is provided with an ice breaking elastic piece, the elastic force of the ice breaking elastic piece is greater than that of the reset elastic piece, when the handle body is in a closed state, the handle body is continuously pressed in the vehicle, and the rotating leg extrudes the ice breaking elastic piece. This door handle is hidden to rotatory formula of turning up under the normal closed condition, the handle body hides to in the door under the effect of the elastic component that resets, and the surface of handle body and the surface parallel and level of door, when because of low temperature sleet weather, lead to this rotatory formula of turning up to hide the door handle when freezing, because of the setting of the elastic component that opens ice, only need to press the surface of handle body in the car, the handle body can realize opening ice to certain stroke of internal rotation, this structure that opens ice has following several advantages, firstly press any region of handle body surface all can to the car in, the operation area is great, and need not select the operation region, it is very convenient to operate, secondly use the rotation axis of handle body as the lever fulcrum, utilize lever principle, it is more laborsaving to open ice, more ensure successfully to open ice.

Furthermore, the elastic component that resets is the reset torsion spring, the elastic component that opens ice is the elastic sheet that opens ice, perhaps the casing itself has elasticity, the casing forms the elastic component that opens ice with the relative region of rotatory leg. The reset elastic piece and the ice-breaking elastic piece have simple and reliable structures, stable functions, convenient arrangement and lower cost; the handle body is reset by the reset torsion spring instead of the driving mechanism, so that the hand clamping is effectively prevented.

Preferably, the swing arm is provided with a plurality of rollers along the axial direction of the driving shaft, the handle body is provided with a supporting surface, and the rollers are in contact with the supporting surface. The driving mechanism, the driving shaft, the swing arm and the roller can be modularized, so that the door handle is convenient to adapt to rotary upturning hidden door handles of different models, is convenient to produce and manufacture, and has good economic benefit; the contact rolling friction of the roller and the supporting surface greatly reduces friction, reduces friction noise and prolongs service life.

Furthermore, the door lock switch is an electric vehicle door lock switch, a trigger block extends from the handle body, the handle body triggers the door lock switch through the trigger block, the number of the rotating legs is two, the trigger block is located between the two rotating legs, and the trigger block is arranged opposite to the supporting surface. The trigger block can stably and reliably automatically trigger the door lock switch, and has simple structure and small occupied space.

Furthermore, the rotating leg is rotatably connected with the shell through a rotating shaft, and the rotating shaft penetrates through the rotating leg and the trigger block. The rotation of handle body sets up stable in structure reliably, and the intensity of handle body can be strengthened to two rotatory legs, reduces the occupation space of handle body, ensures hand nest district maximize, is convenient for hide a door handle through the manual pulling of hand nest district this rotatory formula of turning up and open the door.

Preferably, the driving shaft is provided with a limiting block, the shell is internally provided with a first limiting face and a second limiting face, the first limiting face and/or the second limiting face are/is provided with a first sensor, the first sensor is in signal connection with the driving mechanism, when the handle body is in a closed state, the limiting block triggers the corresponding first sensor, and when the handle body is in an extending state, the limiting block triggers the corresponding first sensor. The driving shaft is ensured to be reliably and stably stopped after rotating in place, and the rotating upturning type hidden door handle is effectively protected.

Preferably, the driving mechanism comprises a motor and a reduction gear set, the motor is arranged in the shell, the output end of the motor is connected with the input end of the reduction gear set, and the output end of the reduction gear set is connected with the driving shaft; and a second sensor is arranged on the handle body and is in signal connection with the driving mechanism. But actuating mechanism modularization, the door handle is hidden to the rotatory formula of turning up of the different models of adaptation of being convenient for, and the manufacturing of being convenient for has good economic benefits, and actuating mechanism's simple structure is reliable, and the transmission is steady.

Further, the reduction gear set includes a first gear and a second gear that are engaged with each other, the first gear being disposed on an output end of the motor, and the second gear being disposed at one end of the driving shaft. The reduction gear set has simple and reliable structure and stable transmission.

Preferably, offer the breach of stepping down relative with handle body and rotatory leg on the casing, the breach of stepping down department is provided with spacing frame, spacing frame is located handle body all around, the district of dodging of incurving has between rotatory leg and the handle body, works as when the handle body is in the trigger state, it is spacing with spacing frame contact to dodge the district. The avoidance area can effectively turn out the handle body without interference, and the avoidance area also reduces the occupied space of the handle body and ensures that the hand nest area has enough manual operation space; when the handle body is in a trigger state, the avoidance area is in contact with the limiting frame to achieve hard stop, when the handle body is in a closed state, the rotating legs are in contact with the shell to achieve hard stop, the handle body is enabled to rotate upwards and the return position is accurate, and the rotating upwards-turning type hidden door handle is effectively protected.

Has the advantages that:

1. the rotary upturning type hidden door handle has the advantages that the rotating axis of the rotating leg is consistent with the direction of the length of a vehicle, the driving shaft and the rotating axis of the rotating leg are arranged in parallel, the driving mechanism is in transmission connection with the driving shaft, the swing arm arranged on the driving shaft drives the handle body to rotate outwards and upturn until the hand nest area is exposed out of the shell and is in an extending state, the handle body is further pulled outwards manually through the hand nest area until the handle body triggers the door lock switch to be in a triggering state, at the moment, the door can be opened by pulling the handle body outwards manually, when the handle body is released, the handle body is hidden in the door under the action of the reset elastic piece and is reset to a closing state again, the rotary upturning type hidden door handle has the advantages of simple and reliable structure, ingenious design, few internal transmission parts, stable driving, reasonable and compact layout, small size, effectively reduces the space occupied in the vehicle width direction, ensures the riding space in the vehicle, is more suitable for the market needs, and has good market prospect;

2. according to the rotary upturning type hidden door handle, under a normal closing state, the handle body is hidden into a vehicle door under the action of the reset elastic piece, the outer surface of the handle body is flush with the outer surface of the vehicle door, when the rotary upturning type hidden door handle is frozen due to low-temperature rainy and snowy weather, the outer surface of the handle body is only required to be pressed towards the inside of the vehicle, the handle body can rotate for a certain stroke around the rotary shaft to break ice, at the moment, the rotary legs press the ice breaking elastic piece, after the handle body is released, the handle body reversely rotates and resets under the action of the ice breaking elastic piece due to the fact that the elastic force of the ice breaking elastic piece is larger than that of the reset torsion spring, and accordingly ice breaking operation is completed.

3. According to the rotary upturning type hidden door handle, the roller on the swing arm is in contact with the supporting surface, and the driving mechanism, the driving shaft, the swing arm and the roller can be modularized, so that the rotary upturning type hidden door handle is convenient to adapt to different types of rotary upturning type hidden door handles, is convenient to produce and manufacture, and has good economic benefits; the contact rolling friction of the roller and the supporting surface greatly reduces friction, reduces friction noise and prolongs service life.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a perspective view of a door handle according to the present invention in a closed position;

FIG. 2 is a schematic perspective view of the hidden housing of FIG. 1;

FIG. 3 is a schematic view of another angular perspective structure of the door handle assembly in a closed state;

FIG. 4 is a schematic front view of the turn-up hidden door handle of the present invention in a closed position;

FIG. 5 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is a perspective view of the door handle assembly in an extended position;

FIG. 7 is a schematic cross-sectional view taken along line B-B of FIG. 4;

FIG. 8 is a cross-sectional schematic view of the extended state of FIG. 7;

FIG. 9 is a schematic cross-sectional view of the trigger state of FIG. 7;

the arrow direction in fig. 5 indicates the pressing direction at the time of ice breaking;

in the figure: 1. the handle comprises a shell, 11, a first limiting surface, 12, a second limiting surface, 13, a yielding notch, 14, a limiting frame, 2, a handle body, 21, a hand nest area, 22, a rotating leg, 23, a yielding area, 24, a supporting surface, 25, a trigger block, 3, a driving shaft, 31, a swing arm, 32, a roller, 33, a limiting block, 4, a driving mechanism, 41, a motor, 42, a speed reduction gear set, 5, a reset torsion spring, 6, a vehicle door lock switch, 7, an ice breaking elastic part, 8 and a rotating shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 9, a rotary upturning type hidden door handle comprises a shell 1, a handle body 2, a driving shaft 3, a swing arm 31 and a driving mechanism 4, wherein a recessed hand nest area 21 is arranged below the handle body 2, a rotary leg 22 extends above the handle body 2, the rotary leg 22 is rotatably connected with the shell 1, the rotation axis of the rotary leg 22 is consistent with the vehicle length direction, a return elastic element is arranged between the rotary leg 22 and the shell 1, when the handle body 2 is in a closed state, the handle body is hidden in a vehicle door under the action of the return elastic element, and the outer surface of the handle body 2 is flush with the outer surface of the vehicle door; a vehicle door lock switch 6 is arranged on the shell 1; the driving shaft 3 is rotatably connected with the shell 1, the driving shaft 3 is parallel to the rotating axis of the rotating leg 22, the driving mechanism 4 is in transmission connection with the driving shaft 3, the swing arm 31 is arranged on the driving shaft 3, the swing arm 31 is used for driving the handle body 2 to rotate outwards and turn upwards until the hand nest area 21 is exposed out of the shell 1 and is in an extending state, the handle body 2 is manually pulled outwards through the hand nest area 21 until the handle body 2 triggers the door lock switch 6 to be in a triggering state, and after the driving mechanism 4 drives the driving shaft 3 and the swing arm 31 to rotate reversely and reset, the handle body 2 is hidden in a door to reset under the action of the reset elastic piece.

In order to ensure that the door handle can be quickly broken when the door handle is frozen in low-temperature rainy and snowy weather, in the embodiment, as shown in fig. 2 and 5, an ice breaking elastic member 7 is arranged on the area of the shell 1 opposite to the rotating leg 22, the elastic force of the ice breaking elastic member 7 is greater than that of the reset elastic member, when the handle body 2 is in a closed state, the handle body 2 is continuously pressed into the vehicle, and the rotating leg 22 presses the ice breaking elastic member 7; specifically, the elastic return element is a return torsion spring 5, the elastic ice-breaking element 7 is an elastic ice-breaking sheet, or the shell 1 has elasticity, and the elastic ice-breaking element 7 is formed in the area of the shell 1 opposite to the rotating leg 22. That is, this door handle is hidden to rotatory formula of turning up under the normal closed condition, handle body 2 hides to in the door under the effect of the elastic component that resets, and the surface of handle body 2 and the surface parallel and level of door, when because of low temperature sleet weather, lead to this door handle is hidden to rotatory formula of turning up to freeze, because of the setting of the elastic component 7 that opens ice, only need to press the surface of handle body 2 in the car, handle body 2 can inwards rotate certain stroke and realize breaking ice, this structure that opens ice has following several advantages, firstly, press any region of handle body 2 surface in the car all can, the operation region is great, and need not select the operation region, the operation is very convenient, secondly, use 8 lines of rotation axis of handle body 2 as the lever fulcrum, utilize lever principle, the operation of breaking ice is more laborsaving, more ensure to break ice successfully.

In order to ensure that the driving mechanism 4 stably and reliably drives the handle body 2 to rotate, and ensure that the overall layout of the rotating flip-up hidden door handle is reasonable, the number of parts is reduced, and the occupied space is reduced, in the embodiment, as shown in fig. 1, fig. 2, fig. 3, fig. 5, and fig. 7, the driving mechanism 4 comprises a motor 41 and a reduction gear set 42, the rotating position of the motor 41 can be controlled by a hall sensor, the motor 41 is arranged in the housing 1, the output end of the motor 41 is connected with the input end of the reduction gear set 42, and the output end of the reduction gear set 42 is connected with the driving shaft 3; the reduction gear group 42 includes a first gear and a second gear that are engaged with each other, the first gear being provided on the output end of the motor 41, the second gear being provided at one end of the drive shaft 3; the handle body 2 is provided with a second sensor (not shown in the figures), the second sensor is in signal connection with the driving mechanism 4, and the second sensor is used for receiving a signal of extending and closing the handle body 2; a plurality of rollers 32 are arranged on the swing arm 31 along the axial direction of the driving shaft 3, a supporting surface 24 is arranged on the handle body 2, and the rollers 32 are in contact with the supporting surface 24; the door lock switch 6 of the present embodiment is an electric vehicle door lock switch, a trigger block 25 extends from the handle body 2, the handle body 2 triggers the door lock switch 6 through the trigger block 25, the number of the rotating legs 22 is two, the trigger block 25 is located between the two rotating legs 22, and the trigger block 25 is arranged opposite to the support surface 24; the rotating leg 22 is rotatably connected with the shell 1 through a rotating shaft 8, and the rotating shaft 8 penetrates through the rotating leg 22 and the trigger block 25; be provided with stopper 33 on the drive shaft 3, be provided with first spacing face 11 and the spacing face 12 of second in the casing 1, be provided with first sensor on first spacing face 11 and/or the spacing face 12 of second, first sensor and actuating mechanism 4 signal connection work as when handle body 2 is in the closed condition, stopper 33 triggers corresponding first sensor, works as when handle body 2 is in the state of stretching out, stopper 33 triggers corresponding first sensor.

In order to ensure that the handle body 2 is turned upwards and the return position is accurate, and effectively protect the rotary upturning type hidden door handle, in this embodiment, as shown in fig. 6 to 9, a abdicating notch 13 opposite to the handle body 2 and the rotating leg 22 is formed in the casing 1, a limiting frame 14 is arranged at the abdicating notch 13, the limiting frame 14 is located around the handle body 2, an incursion zone 23 which is bent inwards is formed between the rotating leg 22 and the handle body 2, and when the handle body 2 is in a triggering state, the avosion zone 23 is in contact with the limiting frame 14 for limiting.

The working principle is as follows:

firstly, the handle body 2 is hidden into the vehicle door under the action of the reset torsion spring 5, the outer surface of the handle body 2 is flush with the outer surface of the vehicle door, and at the moment, the handle body 2 is in a closed state, as shown in fig. 1, 5 and 7; when the vehicle door needs to be opened, the motor 41 is started, the motor 41 sequentially drives the reduction gear set 42, the driving shaft 3 and the swing arm 31 to rotate, the roller 32 on the swing arm 31 is in contact with the supporting surface 24 of the handle body, the roller 32 drives the handle body 2 to rotate outwards and turn upwards until the limiting block 33 triggers the second position sensor, at the moment, the motor 41 is paused, the hand nest area 21 is exposed out of the shell 1, and the handle body 2 is in an extending state, as shown in fig. 6 and 8; then, the handle body 2 is manually pulled outwards continuously through the hand nest area 21 until the trigger block 25 triggers the door lock switch 6 to open the door lock of the electric vehicle, at this time, the handle body 2 is in a trigger state, as shown in fig. 9, the handle body 2 is manually pulled outwards continuously until the door is opened, then the handle body 2 is loosened, the motor 41 sequentially drives the reduction gear set 42, the driving shaft 3 and the swing arm 31 to rotate reversely and reset, at this time, the roller 32 on the swing arm 31 is separated from the supporting surface 24 of the handle body, the handle body 2 is hidden in the door to reset under the action of the reset torsion spring 5 until the limit block 33 triggers the first position sensor, at this time, the motor 41 pauses, the outer surface of the handle body 2 is flush with the outer surface of the door, the handle body 2 is in a closed state, as shown in fig. 1, 5 and 7, and the whole door opening action is completed.

When the rotating upturning type hidden door handle is frozen due to low-temperature rain and snow weather, as shown in fig. 1, fig. 2 and fig. 5, the outer surface of the handle body 2 is only required to be pressed towards the inside of the vehicle, the handle body 2 can rotate inwards for a certain stroke around the rotating shaft 8 to break ice, the rotating leg 22 presses the ice breaking elastic piece 7 at the moment, after the handle body 2 is released, the handle body 2 reversely rotates and resets under the action of the ice breaking elastic piece 7 due to the fact that the elastic force of the ice breaking elastic piece 7 is larger than the elastic force of the reset torsion spring 5, the ice breaking operation is completed, the handle body 2 is hidden into the vehicle door at the moment, the outer surface of the handle body 2 is flush with the outer surface of the vehicle door, the handle body 2 is still in a closed state, and the vehicle door opening action is continuously repeated, so that the vehicle door can be opened.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.

Claims (10)

1. A door handle is hidden to rotatory formula of turning up which characterized in that: the handle comprises a shell (1), a handle body (2), a driving shaft (3), a swing arm (31) and a driving mechanism (4), wherein a sunken hand nest area (21) is formed below the handle body (2), a rotating leg (22) extends above the handle body (2), the rotating leg (22) is rotatably connected with the shell (1), the rotating axis of the rotating leg (22) is consistent with the vehicle length direction, a reset elastic piece is arranged between the rotating leg (22) and the shell (1), when the handle body (2) is in a closed state, the handle body is hidden in a vehicle door under the action of the reset elastic piece, and the outer surface of the handle body (2) is flush with the outer surface of the vehicle door; a door lock switch (6) is arranged on the shell (1);

the handle lock is characterized in that the driving shaft (3) is rotatably connected with the shell (1), the driving shaft (3) and the rotating axis of the rotating leg (22) are arranged in parallel, the driving mechanism (4) is in transmission connection with the driving shaft (3), the swing arm (31) is arranged on the driving shaft (3), the swing arm (31) is used for driving the handle body (2) to rotate outwards and turn upwards until the hand nest area (21) is exposed out of the shell (1) and is in an extending state, and then the handle body (2) is manually pulled outwards through the hand nest area (21) until the handle body (2) triggers the door lock switch (6) to be in a triggering state, when the driving mechanism (4) drives the driving shaft (3) and the swing arm (31) to rotate reversely and reset, and the handle body (2) is hidden in a vehicle reset door under the action of the reset elastic piece.

2. The swing-up concealed door handle according to claim 1, wherein: the ice breaking elastic piece (7) is arranged in the area, opposite to the rotating legs (22), of the shell (1), the elastic force of the ice breaking elastic piece (7) is larger than that of the reset elastic piece, when the handle body (2) is in a closed state, the handle body (2) continues to be pressed in the vehicle, and the rotating legs (22) extrude the ice breaking elastic piece (7).

3. The swing-up hidden door handle according to claim 2, wherein: the reset elastic piece is a reset torsion spring (5), the ice breaking elastic piece (7) is an ice breaking elastic sheet, or the shell (1) is elastic, and the ice breaking elastic piece (7) is formed in the area, opposite to the rotating leg (22), of the shell (1).

4. The rotating flip-up concealed door handle according to claim 1, 2 or 3, wherein: a plurality of rollers (32) are arranged on the swing arm (31) along the axial direction of the driving shaft (3), a supporting surface (24) is arranged on the handle body (2), and the rollers (32) are in contact with the supporting surface (24).

5. The swing-up hidden door handle according to claim 4, wherein: the door lock switch (6) is an electric vehicle door lock switch, the handle body (2) is provided with a trigger block (25) in an extending mode, the handle body (2) triggers the door lock switch (6) through the trigger block (25), the number of the rotating legs (22) is two, the trigger block (25) is located between the two rotating legs (22), and the trigger block (25) is arranged opposite to the supporting surface (24).

6. The swing-up hidden door handle according to claim 5, wherein: rotatory leg (22) are rotated with casing (1) through pivot (8) and are connected, pivot (8) pass rotatory leg (22) and trigger block (25) setting.

7. The rotating flip-up concealed door handle according to claim 1, 2 or 3, wherein: be provided with stopper (33) on drive shaft (3), be provided with first spacing face (11) and second spacing face (12) in casing (1), be provided with first sensor on first spacing face (11) and/or second spacing face (12), first sensor and actuating mechanism (4) signal connection, work as when handle body (2) are in the closed condition, stopper (33) trigger corresponding first sensor, work as when handle body (2) are in the extended state, stopper (33) trigger corresponding first sensor.

8. The swing-up concealed door handle according to claim 1, 2 or 3, wherein: the driving mechanism (4) comprises a motor (41) and a reduction gear set (42), the motor (41) is arranged in the shell (1), the output end of the motor (41) is connected with the input end of the reduction gear set (42), and the output end of the reduction gear set (42) is connected with the driving shaft (3); the handle body (2) is provided with a second sensor which is in signal connection with the driving mechanism (4).

9. The swing-up hidden door handle according to claim 8, wherein: the reduction gear set (42) includes a first gear and a second gear that are engaged with each other, the first gear being provided on an output end of the motor (41), and the second gear being provided at one end of the drive shaft (3).

10. The rotating flip-up concealed door handle according to claim 1, 2 or 3, wherein: offer on casing (1) with handle body (2) and rotatory leg (22) relative breach of stepping down (13), breach of stepping down (13) department is provided with spacing frame (14), spacing frame (14) are located around handle body (2), have between rotatory leg (22) and handle body (2) the district (23) of dodging of incurving, work as when handle body (2) are in the trigger state, it is spacing with spacing frame (14) contact to dodge district (23).

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