Electric screwdriver

Abstract

The electric screwdriver comprises an outer shell, a processor, a driving mechanism and a rotating shaft mechanism, and the processor is provided with a first switch used for starting the driving mechanism to work; the rotating shaft mechanism comprises a bit connecting shaft installed on the top of the driving mechanism in a lifting and sliding mode and a downward pressing assembly connected with the driving mechanism and the bit connecting shaft. The downward pressing assembly comprises a first clamping spring fixedly connected to the top of the driving mechanism, a second clamping spring fixedly connected to the bit connecting shaft, an elastic piece connected between the first clamping spring and the second clamping spring, and a microswitch connected to one end of the elastic piece. The microswitch comprises a first push rod and a second push rod connected to the first push rod in a lifting sliding mode, the end, away from the elastic piece, of the first push rod abuts against the end, away from the elastic piece, of the second push rod, and the end, away from the elastic piece, of the second push rod abuts against the first switch. The electric screw driver has the effect that the electric screw driver can be reused when the microswitch fails and is damaged, so that the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric tool technology, in particular to an electric screwdriver. BACKGROUND

[0002] The electric screwdriver is an electric tool driven by electricity, which is specially used for tightening and loosening screws, and is widely used in industrial production and home repair scenes.

[0003] The electric screwdriver can be divided into a press switch type electric screwdriver and a down-pressing type electric screwdriver according to the starting mode. The press switch type electric screwdriver has a press switch, and the operator can control the start and stop of the electric screwdriver by pressing and releasing the press switch. The down-pressing type electric screwdriver is provided with a micro switch. After the operator places the head of the electric screwdriver on the head of the screw and presses it downward by a certain distance, the micro switch is lowered and triggers the starting switch of the electric screwdriver, and the electric screwdriver starts to work without additional switch operation. The down-pressing type electric screwdriver can reduce the hand movement of the operator, the operation is more coherent, and it is suitable for high-frequency operation. However, the micro switch of the down-pressing type electric screwdriver is easy to malfunction and damage during use. Once the micro switch malfunctions and is damaged, the electric screwdriver cannot be used again.

[0004] According to the related technology in the above, the inventor believes that the existing down-pressing type electric screwdriver cannot be used again once the micro switch malfunctions and is damaged, and the service life is relatively low. CONTENT OF THE UTILITY MODEL

[0005] In order to make the electric screwdriver still be used again when the micro switch of the down-pressing type electric screwdriver malfunctions and is damaged, and prolong its service life, the present application provides an electric screwdriver.

[0006] The electric screwdriver provided by the present application adopts the following technical scheme:

[0007] An electric screwdriver, comprising an outer shell, a processor arranged in the outer shell, a driving mechanism arranged in the outer shell, and a rotating shaft mechanism connected to the driving mechanism, wherein a first switch for starting the driving mechanism is arranged on the processor; the rotating shaft mechanism comprises a bit adapter shaft which is slidably arranged on the top of the driving mechanism, and a down-pressing assembly which connects the driving mechanism and the bit adapter shaft, wherein the down-pressing assembly comprises a first snap spring fixed to the driving mechanism, a second snap spring fixed to the bit adapter shaft, an elastic member connected between the first snap spring and the second snap spring, and a micro switch connected to one end of the elastic member; the micro switch comprises a first push rod and a second push rod which is slidably connected to the first push rod, wherein one end of the first push rod away from the elastic member abuts against one end of the second push rod away from the elastic member, and one end of the second push rod away from the elastic member abuts against the first switch.

[0008] By adopting the technical scheme, the micro switch is connected to one end of the elastic member, the first push rod and the second push rod connected to the first push rod are arranged in the micro switch, one end of the first push rod abuts against one end of the second push rod, and the end of the second push rod away from the elastic member abuts against the first switch, so that when the operator places the bit head of the electric screwdriver on the screw head and presses it downward, the bit head shaft overcomes the elastic force of the elastic member and moves into the housing along the axial direction, the bit head shaft drives the micro switch to press the first switch along the axial direction to start the driving mechanism to work and drive the bit head shaft to rotate; after the operation is completed, when the bit head shaft is not stressed, the elastic member pushes the bit head shaft and the micro switch to reset under the action of the elastic force. If the bit head shaft fails to move the micro switch during use, the operator can move the second push rod downward to make the second push rod of the micro switch move downward and press the first switch to start the driving mechanism. Therefore, the electric screwdriver can reduce the hand movement of the operator when the micro switch is effective, the operation is more coherent under high-frequency operation, the electric screwdriver can still be used when the micro switch is damaged, and the service life of the electric screwdriver is prolonged.

[0009] Optionally, the first push rod comprises a fixed ring arranged between the elastic member and the second snap spring and a first vertical rod connected with the fixed ring, and the second push rod comprises a second vertical rod parallel to the outside of the first vertical rod, a fixed block arranged at one end of the second vertical rod, and a second switch arranged at the other end of the second push rod and used for manual actuation; one end of the first vertical rod away from the fixed ring abuts against the fixed block, and the fixed block abuts against the first switch.

[0010] By adopting the technical scheme, the specific connection structure of the first push rod and the second push rod is disclosed, the fixed ring of the first push rod is arranged between the elastic member and the second snap spring, one end of the first vertical rod of the first push rod away from the fixed ring abuts against the fixed block of the second push rod, the fixed block abuts against the first switch, and the second push rod is provided with the second switch used for manual actuation, so that the bit head shaft can drive the first push rod and the second push rod to descend when it is pressed downward, the fixed block of the second push rod presses the first switch to start the driving mechanism to work, and when the bit head shaft is no longer pressed downward, the elastic member resets to make the fixed block no longer press the first switch, and the driving mechanism stops working; when the second switch is manually actuated to descend, the fixed block presses the first switch to start the driving mechanism to work, and when the second switch is manually actuated to ascend and reset, the fixed block no longer presses the first switch, and the driving mechanism stops working.

[0011] Optionally, the second vertical rod is provided with a limiting piece located on both sides of the length direction of the first vertical rod.

[0012] By adopting the above technical solution, limiting members are set on the second vertical rod on both sides of the length direction of the first vertical rod, which restricts the relative position of the first vertical rod and the second vertical rod when moving, so that after multiple movements, the end of the first vertical rod away from the fixed ring can still abut against the fixed block of the second push rod.

[0013] Optionally, the second switch is provided with a plurality of hemispherical protrusions.

[0014] By adopting the above technical solution, several hemispherical protrusions are set on the second switch, which increases the friction between the operator's hand and the second switch when the operator moves the second switch, prevents slippage, and ensures that the operator can move the second switch steadily.

[0015] Optionally, the outer casing includes a first housing, a second housing connected to one end of the first housing, and a bottom cover connected to the other end of the first housing. The outer peripheral wall of the first housing is provided with a first snap-fit ​​groove evenly spaced along the circumferential direction, and the inner peripheral wall of the second housing is provided with a first buckle evenly spaced along the circumferential direction that cooperates with the first snap-fit ​​groove. The first housing and the second housing are snapped together by the first snap-fit ​​groove and the first buckle.

[0016] By adopting the above technical solution, the specific structure of the outer shell is disclosed. The outer shell consists of a first shell, a second shell, and a bottom cover. The outer peripheral wall of the first shell is provided with a first snap-fit ​​groove evenly spaced along the circumferential direction. The inner peripheral wall of the second shell is provided with a first snap-fit ​​groove evenly spaced along the circumferential direction. This makes the connection strength between the first shell and the second shell more ideal, and also facilitates the assembly and disassembly of the first shell and the second shell.

[0017] Optionally, the bottom cover is provided with a mounting base and a gear adjustment gear mounted on the mounting base. The bottom cover is also provided with a first through hole through which the bottom of the gear adjustment gear passes. The bottom cover has arc-shaped protrusions on both sides of the first through hole. The gear adjustment gear is provided with several adjustment positions and is electrically connected to the processor.

[0018] By adopting the above technical solution, the gear adjustment gear is installed on the mounting base on the bottom cover. The bottom of the gear passes through the first through hole on the bottom cover. Since there are arc-shaped protrusions on both sides of the first through hole on the bottom cover, the gear adjustment gear is protected. The gear adjustment gear is equipped with adjustment gears so that the operator can rotate the gear adjustment gear to adjust the torque gear of the electric screwdriver according to different work needs.

[0019] Optionally, the second housing is provided with a top cover at one end away from the first housing. The inner peripheral wall of the second housing is provided with a second snap-fit ​​groove evenly spaced along the circumferential direction. The top cover is provided with a second buckle that cooperates with the second snap-fit ​​groove. The second housing and the top cover are snapped together through the second snap-fit ​​groove and the second snap-fit ​​groove. The top cover is provided with a second through hole for one end of the bit shaft to extend out.

[0020] By adopting the above technical solution, a top cover is provided at one end of the second housing. The top cover is snapped into the second housing, and the top cover has a second through hole for the end of the bit shaft to extend out. The top cover reduces the probability of the pressing component and the drive mechanism coming into contact with the outside world, which can reduce the entry of impurities into the electric screwdriver and improve the appearance of the electric screwdriver.

[0021] Optionally, the first housing is provided with a first slide groove and a third switch that is slidably installed in the first slide groove and used to control the forward and reverse rotation of the drive mechanism. The third switch is provided with a third buckle on its inner side. The third switch is snapped into the first housing through the third buckle. The third switch is electrically connected to the processor.

[0022] By adopting the above technical solution, the third switch is slidably installed in the first slide groove and the third switch is snapped into the first housing by the third buckle. The operator can slide the third switch according to different work needs, and the processor controls the rotation direction of the drive motor according to the position information of the third switch.

[0023] Optionally, the first housing has a third through hole for the second switch to extend and move axially, and the second housing has an arched through groove for the second switch to extend and cooperate with the third through hole.

[0024] By adopting the above technical solution, a connection structure between the second switch and the first and second housings is disclosed. The first housing has a third through hole for the second switch to extend and move axially, and the second housing has an arched through groove for the second switch to extend and cooperate with the third through hole, so that the second switch can be operated.

[0025] Optionally, the drive mechanism includes a drive motor and a reduction gearbox, the input end of the reduction gearbox being connected to the output shaft of the drive motor, and the output end of the reduction gearbox being connected to the rotating shaft mechanism.

[0026] By adopting the above technical solution, the setting of the reduction gearbox can increase the torque at the output end of the drive mechanism, which helps to enable the drive mechanism to output greater torque to meet the working requirements under the condition of limited size.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. An electric screwdriver comprising a housing, a processor, a drive mechanism, and a rotating shaft mechanism. The rotating shaft mechanism includes a pressing component and a bit receiving shaft. The pressing component contains a micro switch with a first push rod and a second push rod, which reduces operator hand movement and enables smoother operation during high-frequency work when the micro switch is active. The electric screwdriver can also be used again when the micro switch fails or is damaged, thus extending its service life.

[0029] 2. By setting a fixing block abutting against the first switch at one end of the second push rod, and setting a second switch for manual operation at the other end of the second push rod, the operator can manually operate the second switch to control the start and stop of the electric screwdriver.

[0030] 3. By opening a third through hole in the first housing for the second switch to extend and move axially, and opening an arched through slot in the second housing for the second switch to extend and cooperate with the third through hole, the second switch is made easy to operate. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of an electric screwdriver in an embodiment of this application.

[0032] Figure 2 This is a cross-sectional schematic diagram of the electric screwdriver in an embodiment of this application.

[0033] Figure 3 This is a schematic diagram of the rotating shaft mechanism in an embodiment of this application.

[0034] Figure 4 This is a schematic diagram of a micro switch in an embodiment of this application.

[0035] Figure 5 This is a front view of the electric screwdriver in an embodiment of this application.

[0036] Figure 6 This is a schematic diagram of the engagement of the first and second shells in an explosive state, as shown in the embodiments of this application.

[0037] Figure 7 This is a schematic diagram of the cooperation between the first housing and the third switch in an explosion state in an embodiment of this application.

[0038] Figure 8 This is a schematic diagram of the first shell and bottom cover in an explosion state in an embodiment of this application.

[0039] Explanation of reference numerals in the attached drawings: 1. Outer shell; 11. First shell; 111. First snap-fit ​​groove; 112. Third through hole; 113. First slide groove; 114. Third switch; 1141. Third buckle; 12. Second shell; 121. First buckle; 122. Arched through groove; 123. Top cover; 1231. Second buckle; 1232. Second through hole; 124. Second snap-fit ​​groove; 13. Bottom cover; 131. Mounting base; 132. Adjusting gear; 133. First through hole; 134. Arc-shaped protrusion; 2. Processor; 21. First switch; 3. Drive mechanism; 31. Drive motor; 32. Reduction gearbox; 4. Battery pack; 5. Rotating shaft mechanism; 51. Bit connecting shaft; 52. Pressing assembly; 521. First snap ring; 522. Second snap ring; 523. Elastic element; 6. Micro switch; 61. First push rod; 611. Fixing ring; 612. First vertical rod; 62. Second push rod; 621. Second vertical rod; 622. Fixing block; 623. Second switch; 624. Limiting element; 625. Hemispherical protrusion. Detailed Implementation

[0040] The following is in conjunction with the appendix Figures 1-8 This application will be described in further detail.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0042] This application discloses an electric screwdriver. (Refer to...) Figure 1 and Figure 2The electric screwdriver includes a housing 1, a processor 2 disposed within the housing 1, a drive mechanism 3 disposed within the housing 1, a battery pack 4, and a rotating shaft mechanism 5 connected to the top of the drive mechanism 3. The processor 2 is a circuit board, and a first switch 21 for starting the drive mechanism 3 is provided on the processor 2. The drive mechanism 3 includes a drive motor 31 and a reduction gearbox 32 located on top of the drive motor 31. The input end of the reduction gearbox 32 is connected to the output shaft of the drive motor 31, and the output end of the reduction gearbox 32 is connected to the rotating shaft mechanism 5. The battery pack 4 is connected to and powers the drive motor 31 and the processor 2.

[0043] refer to Figure 2 and Figure 3 The rotating shaft mechanism 5 includes a bit receiving shaft 51 that is vertically and slidably mounted on the top of the reduction gearbox 32, and a pressing assembly 52 connecting the reduction gearbox 32 and the bit receiving shaft 51. The pressing assembly 52 includes a first retaining spring 521 mounted on the top of the drive mechanism 3, a second retaining spring 522 mounted on the bit receiving shaft 51, an elastic element 523 connected between the first retaining spring 521 and the second retaining spring 522, and a micro switch 6. In this embodiment, the elastic element 523 is a wave spring. The top of the micro switch 6 is arranged between the elastic element 523 and the second retaining spring 522. When the bit receiving shaft 51 is subjected to downward pressure, it will descend, and will drive the second retaining spring 522 and the micro switch 6 to press down, causing the elastic element 523 to deform.

[0044] refer to Figure 3 and 4 The micro switch 6 includes a first push rod 61 and a second push rod 62 that is vertically and slidably connected to the first push rod 61. The first push rod 61 includes a fixing ring 611 arranged between the elastic member 523 and the second retaining spring 522 and a first vertical rod 612 integrally connected to the fixing ring 611. The second push rod 62 includes a second vertical rod 621 parallel to and attached to the outside of the first vertical rod 612, a fixing block 622 disposed at the bottom end of the second vertical rod 621, and a second switch 623 disposed at the top of the second push rod 62 for manual operation. The second vertical rod 621, the fixing block 622, and the second switch 623 are integrally connected. The bottom end of the first vertical rod 612 abuts against the fixing block 622, and the bottom end of the fixing block 622 abuts against the first switch 621. The top of the second push rod 62 is provided with limiting members 624 located on both sides of the length direction of the first vertical rod 612, which limit the relative position of the first vertical rod 612 and the second vertical rod 621. The second switch 623 has several hemispherical protrusions 625 on its outer side, which makes it less likely for the operator to slip when moving the second switch 623.

[0045] refer to Figure 5 and Figure 6The outer casing 1 includes a first casing 11, a second casing 12 connected to the top of the first casing 11, and a bottom cover 13 connected to the bottom of the first casing 11. The outer peripheral wall of the top of the first casing 11 has evenly spaced first snap-fit ​​grooves 111, and the inner peripheral wall of the second casing 12 has evenly spaced first buckles 121. The first casing 11 and the second casing 12 are snapped together by the first snap-fit ​​grooves 111 and the first buckles 121. The top of the first casing 11 has a third through hole 112, and the bottom of the second casing 12 has an arched through groove 122 that mates with the third through hole 112. The second switch 623 can extend out of the third through hole 112 and the arched through groove 122 and move axially.

[0046] refer to Figure 5 and Figure 6 The second housing 12 has a top cover 123 on its top. The second housing 12 has a second snap-fit ​​groove 124 evenly spaced along the circumferential direction on the inner circumferential wall of the top. The top cover 123 has a second buckle 1231 that cooperates with the second snap-fit ​​groove 124. The top cover 123 is snapped onto the top of the second housing 12 through the second buckle 1231. The top cover 123 has a second through hole 1232 at its center that penetrates its upper and lower surfaces. The diameter of the second through hole 1232 is larger than the outer diameter of the bit shaft 51. One end of the bit shaft 51 extends out of the second through hole 1232.

[0047] refer to Figure 5 and Figure 7 The first housing 11 is provided with a first slide groove 113 and a third switch 114 that is slidably installed in the first slide groove 113 and used to control the forward and reverse rotation of the drive motor 31. The third switch 114 is electrically connected to the processor 2. The inner side of the third switch 114 is provided with a third buckle 1141 that cooperates with the first slide groove 113. The third switch 114 is snapped into the first housing 11 through the third buckle 1141. The operator can control the rotation direction of the bit shaft 51 by axially sliding the third switch 114 according to different work needs.

[0048] refer to Figure 5 and Figure 8 The bottom cover 13 is provided with a mounting base 131 and a gear 132 mounted on the mounting base 131. The bottom cover 13 is also provided with a first through hole 133 that penetrates its upper and lower surfaces, and the bottom of the gear 132 passes through the first through hole 133. The bottom cover 13 is provided with arc-shaped protrusions 134 on both sides of the first through hole 133. The gear 132 is provided with several adjustment positions. The operator can rotate the gear 132 to adjust the torque position of the electric screwdriver according to different work needs.

[0049] The implementation principle of an electric screwdriver according to an embodiment of this application is as follows: When the operator places the screwdriver bit on the screw head and presses it down, the bit connector 51 moves axially against the elastic force of the elastic element 523 and into the housing 1. The bit connector 51 drives the micro switch 6 to press the first switch 21 axially, activating the drive mechanism 3 and thus driving the bit connector 51 to rotate. After the operation is completed, when the bit connector 51 is no longer under force, the elastic element 523 pushes the bit connector 51 and the micro switch 6 back to their original positions under the action of the elastic force. If the movement of the micro switch 6 by pressing down the bit connector 51 fails during use, the operator can move the second switch 623 axially, causing the second push rod 62 of the micro switch 6 to move downward and press the first switch 21 to activate the drive mechanism 3. This allows the electric screwdriver to be used again even if the micro switch 6 fails, extending its service life.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electric screwdriver, comprising a housing (1), a processor (2) disposed within the housing (1), a drive mechanism (3) disposed within the housing (1), and a rotating shaft mechanism (5) connected to the drive mechanism (3), wherein the processor (2) is provided with a first switch (21) for activating the drive mechanism (3); the rotating shaft mechanism (5) comprises a bit receiving shaft (51) slidably mounted on the top of the drive mechanism (3), and a pressing assembly (52) connecting the drive mechanism (3) and the bit receiving shaft (51), characterized in that, The pressing assembly (52) includes a first retaining ring (521) fixed to the drive mechanism (3), a second retaining ring (522) fixed to the bit shaft (51), an elastic element (523) connected between the first retaining ring (521) and the second retaining ring (522), and a micro switch (6) connected to one end of the elastic element (523); the micro switch (6) includes a first push rod (61) and a second push rod (62) that is slidably connected to the first push rod (61), the end of the first push rod (61) away from the elastic element (523) abuts against the end of the second push rod (62) away from the elastic element (523), and the end of the second push rod (62) away from the elastic element (523) abuts against the first switch (21).

2. The electric screwdriver according to claim 1, characterized in that, The first push rod (61) includes a retaining ring (611) arranged between the elastic member (523) and the second retaining ring (522) and a first vertical rod (612) connected to the retaining ring (611). The second push rod (62) includes a second vertical rod (621) parallel to the outside of the first vertical rod (612), a retaining block (622) disposed at one end of the second vertical rod (621), and a second switch (623) disposed at the other end of the second push rod (62) and used for manual operation. The end of the first vertical rod (612) away from the retaining ring (611) abuts against the retaining block (622), and the retaining block (622) abuts against the first switch (21).

3. An electric screwdriver according to claim 2, characterized in that, The second vertical rod (621) is provided with limiting members (624) located on both sides of the length direction of the first vertical rod (612).

4. An electric screwdriver according to claim 2, characterized in that, The second switch (623) is provided with a plurality of hemispherical protrusions (625).

5. An electric screwdriver according to claim 2, characterized in that, The outer shell (1) includes a first shell (11), a second shell (12) connected to one end of the first shell (11), and a bottom cover (13) connected to the other end of the first shell (11). The outer peripheral wall of the first shell (11) is provided with a first snap-fit ​​groove (111) evenly spaced along the circumferential direction. The inner peripheral wall of the second shell (12) is provided with a first buckle (121) evenly spaced along the circumferential direction and cooperating with the first snap-fit ​​groove (111). The first shell (11) and the second shell (12) are snapped together by the first snap-fit ​​groove (111) and the first buckle (121).

6. An electric screwdriver according to claim 5, characterized in that, The bottom cover (13) is provided with a mounting base (131) and a gear (132) mounted on the mounting base (131). The bottom cover (13) is also provided with a first through hole (133) through which the bottom of the gear (132) passes. The bottom cover (13) is provided with arc-shaped protrusions (134) on both sides of the first through hole (133). The gear (132) is provided with several adjustment positions and is electrically connected to the processor (2).

7. An electric screwdriver according to claim 5, characterized in that, The second housing (12) has a top cover (123) at one end away from the first housing (11). The inner peripheral wall of the second housing (12) has a second snap-fit ​​groove (124) with evenly spaced intervals. The top cover (123) has a second buckle (1231) that cooperates with the second snap-fit ​​groove (124). The second housing (12) and the top cover (123) are snapped together by the second snap-fit ​​groove (124). The top cover (123) has a second through hole (1232) for one end of the bit shaft (51) to extend out.

8. An electric screwdriver according to claim 5, characterized in that, The first housing (11) is provided with a first slide groove (113) and a third switch (114) which is slidably installed in the first slide groove (113) and used to control the forward and reverse rotation of the drive mechanism (3). The third switch (114) is provided with a third buckle (1141) on its inner side. The third switch (114) is snapped into the first housing (11) through the third buckle (1141). The third switch (114) is electrically connected to the processor (2).

9. An electric screwdriver according to claim 5, characterized in that, The first housing (11) has a third through hole (112) for the second switch (623) to extend and move axially, and the second housing (12) has an arched through groove (122) for the second switch (623) to extend and cooperate with the third through hole (112).

10. An electric screwdriver according to claim 1, characterized in that, The drive mechanism (3) includes a drive motor (31) and a reduction gearbox (32). The input end of the reduction gearbox (32) is connected to the output shaft of the drive motor (31), and the output end of the reduction gearbox (32) is connected to the rotating shaft mechanism (5).

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