Electric screwdriver structure capable of improving grounding

Abstract

The utility model relates to a kind of electric screwdriver structure capable of improving grounding, it is characterized in that, including electric screwdriver shell and being arranged in the electric screwdriver shell body by motor-driven rotating the output shaft capable of conducting electricity, detachable installation can be conducted on the outer end of the output shaft electric screwdriver head capable of conducting electricity, electric screwdriver shell is equipped with the mounting hole of inner end to the outer surface of output shaft, outer end to the outer surface of shell and the elastic conductive pressure head being equipped in mounting hole, the inner end of the elastic conductive pressure head is pressed to the outer surface of output shaft, another position of electric screwdriver shell or the position of being located in the side of electric screwdriver shell is installed with grounding screw capable of conducting electricity with elastic conductive pressure head, the grounding screw is electrically connected with ground wire.

Description

Technical Field

[0001] This utility model relates to power tools, and more particularly to a screwdriver structure that can improve grounding. Background Technology

[0002] Electric screwdrivers, also known as electric screwdrivers or electric screwdrivers, are mainly used for quickly tightening or loosening screws and are widely used in fields such as electronics repair, furniture assembly, and automobile repair.

[0003] When the internal insulation of the electric screwdriver is damaged (such as a short circuit in the motor windings or aging of the wiring), the metal casing may become electrified. An electrified metal casing poses a risk of electric shock to the user. Therefore, a grounding wire is installed on the metal casing.

[0004] However, current electric screwdrivers do not handle static electricity generated even when the screwdriver is not damaged. This static electricity can easily damage the object being used (such as electronic components on a circuit board) through the screwdriver bit. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide an electric screwdriver structure that can improve grounding, which helps to reduce damage to the user caused by leakage current or static electricity.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] This utility model discloses an electric screwdriver structure that improves grounding. It comprises an electric screwdriver housing and a conductive output shaft driven by a motor and housed within the housing. A conductive screwdriver bit is detachably mounted on the outer end of the output shaft. The electric screwdriver housing has a mounting hole with its inner end extending to the outer surface of the output shaft and its outer end extending to the outer surface of the housing, and an elastic conductive head disposed within the mounting hole. The inner end of the elastic conductive head presses against the outer surface of the output shaft. A grounding screw, capable of conducting electricity with the elastic conductive head, is mounted at another location on the electric screwdriver housing or at a location adjacent to the inside of the housing. The grounding screw is electrically connected to a grounding wire.

[0008] Preferably, the aforementioned elastic conductive voltage head includes a mounting cover with an inner countersunk hole installed in the mounting hole, wherein the conductive carbon brush and a spring for pushing the conductive carbon brush against the output shaft are installed in the inner countersunk hole.

[0009] Preferably, the mounting hole is a threaded hole, and the outer peripheral wall of the mounting cover is provided with an external thread that is threaded to the threaded hole. The outer end of the mounting cover has a slot or a cross slot to facilitate screwing the mounting cover on.

[0010] Preferably, the conductive carbon brush is a silver carbon brush.

[0011] Preferably, the mounting cover is a cylindrical body that is interference-fitted with the mounting hole.

[0012] Preferably, the axis of the aforementioned elastic conductive voltage head is arranged perpendicular to the axis of the output shaft.

[0013] Preferably, the grounding wire is a long strip of copper.

[0014] The working principle of this invention can improve the grounded electric screwdriver structure: the elastic conductive head is pressed against the output shaft, and the electric screwdriver head and the output shaft have the function of mutual conduction. The elastic conductive head contacts the rotating part of the output shaft, and can play the role of conduction while sliding. Then, the conduction function is extended to the electric screwdriver shell (without an anode), and then conducted to the grounding wire for discharge. That is, when static electricity is generated, it can be discharged through the grounding wire. Attached Figure Description

[0015] Figure 1 , Figure 2 These are perspective views of this utility model from two angles;

[0016] Figure 3 This is a partial cross-sectional view of the present invention;

[0017] Figure 4 This is a partial exploded view of this utility model. Detailed Implementation

[0018] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0019] This utility model improves the grounding structure of the electric screwdriver, which includes a conductive electric screwdriver shell 1 (which may be made of metal materials such as stainless steel or cast iron) and a conductive output shaft 2 that is driven to rotate by a motor (which may be a brushless servo motor) inside the electric screwdriver shell. A conductive electric screwdriver bit 3 is detachably installed on the outer end of the output shaft 2. The end of the electric screwdriver bit 3 may be cross-shaped or slotted.

[0020] The electric screwdriver housing 1 is provided with a mounting hole 4, the inner end of which extends to the outer surface of the output shaft 2 and the outer end of which extends to the outer surface of the housing 1, and an elastic conductive head 5 provided in the mounting hole.

[0021] The inner end of the elastic conductive voltage head 5 presses against the outer surface of the output shaft. A grounding screw 6 that can conduct electricity with the elastic conductive voltage head 5 is installed at another position of the electric screwdriver housing 1 or at a position inside the electric screwdriver housing. The grounding screw 6 is electrically connected to the grounding wire 7 (the grounding wire 7 can be a long strip of grounding copper sheet or copper wire).

[0022] The flexible conductive tip contacts the outer surface of the output shaft, which can conduct electricity while sliding. The conductivity is then extended to the electric screwdriver housing (without an anode), and then conducted to the grounding screw 6 and grounding wire 7 for discharge. That is, when static electricity is generated, it can be discharged through the grounding wire, thereby reducing or avoiding the conduction of static electricity to the object being used through the electric screwdriver tip 3 to reduce damage.

[0023] The elastic conductive head 5 includes a mounting cover 8 with an inner countersunk hole installed in the mounting hole. A conductive carbon brush 9 and a spring 10 that pushes the conductive carbon brush 9 against the output shaft are installed in the inner countersunk hole. The spring 10 is a compression spring that can push the conductive carbon brush 9 against the outer surface of the output shaft.

[0024] In one embodiment (preferred embodiment), the mounting hole 4 is a threaded hole, and the outer peripheral wall of the mounting cover is provided with an external thread that is threaded to the threaded hole. The outer end of the mounting cover has a slot or a cross slot, and the mounting cover can be easily screwed on with a slotted or cross screwdriver. The removability of the mounting cover makes it easy to replace the conductive carbon brush 9.

[0025] Another embodiment is that the mounting cover is a cylindrical body that is interference-fitted with the mounting hole, or the mounting cover and the mounting hole are snap-fitted together.

[0026] The aforementioned conductive carbon brush is a silver carbon brush, which is a commercially available component. It has good conductivity and is worn down during continuous frictional contact with the output shaft surface, while the wear on the output shaft is minimal. The conductive carbon brush can be replaced by removing the mounting cover, which can be made of copper.

[0027] Ideally, the axis of the flexible conductive voltage head should be set perpendicular to the axis of the output shaft, but of course, they do not have to be perpendicular.

[0028] The working principle of this invention can improve the grounded electric screwdriver structure: the elastic conductive head is pressed against the output shaft, and the electric screwdriver head and the output shaft have the function of mutual conduction. The elastic conductive head contacts the rotating part of the output shaft, and can play the role of conduction while sliding. Then, the conduction function is extended to the electric screwdriver shell (without an anode), and then conducted to the grounding wire for discharge. That is, when static electricity is generated, it can be discharged through the grounding wire.

[0029] Other structures in the electronically applied part of this application are prior art and will not be described in detail here.

[0030] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A screwdriver structure capable of improving grounding, characterized in that, The device includes an electric screwdriver housing and a conductive output shaft driven by a motor and housed within the housing. A conductive electric screwdriver bit is detachably mounted on the outer end of the output shaft. The electric screwdriver housing has a mounting hole with its inner end extending to the outer surface of the output shaft and its outer end extending to the outer surface of the housing, and an elastic conductive head disposed in the mounting hole. The inner end of the elastic conductive head presses against the outer surface of the output shaft. A grounding screw capable of conducting electricity with the elastic conductive head is installed at another location on the electric screwdriver housing or at a location inside the housing, and the grounding screw is electrically connected to a grounding wire.

2. The electric screwdriver structure capable of improving grounding according to claim 1, characterized in that, The elastic conductive head includes a mounting cover with an inner countersunk hole installed in the mounting hole, wherein a conductive carbon brush and a spring that pushes the conductive carbon brush against the output shaft are installed in the inner countersunk hole.

3. The electric screwdriver structure capable of improving grounding according to claim 2, characterized in that, The mounting hole is a threaded hole, and the outer peripheral wall of the mounting cover is provided with an external thread that is threaded to the threaded hole. The outer end of the mounting cover has a slot or a cross slot to facilitate screwing the mounting cover on.

4. The electric screwdriver structure capable of improving grounding according to claim 3, characterized in that, The conductive carbon brush is a silver carbon brush.

5. The electric screwdriver structure capable of improving grounding according to claim 2, characterized in that, The mounting cover is a cylindrical body that is interference-fitted with the mounting hole.

6. The electric screwdriver structure capable of improving grounding according to claim 2, 3, 4 or 5, characterized in that, The centerline of the elastic conductive voltage head is set perpendicular to the centerline of the output shaft.

7. The electric screwdriver structure capable of improving grounding according to claim 1, characterized in that, The grounding wire is a long, strip-shaped copper grounding sheet.

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