An electric screwdriver

Abstract

The utility model provides a kind of electric screwdriver, including main body, gripping body, driving assembly and light emitting device, the front end of main body is equipped with plug-in part, the plug-in part is used to detachably install screwdriver connector;The gripping body is connected with the main body at preset angle, and the gripping body surface is equipped with start switch;The driving assembly is arranged in the main body, and the output shaft of the driving assembly extends into the plug-in part, to be connected with the screwdriver connector installed in the plug-in part;The light emitting device is arranged on the main body;When the start switch is triggered, the light emitting device is lighted and emits light to the plug-in part direction, to provide illumination for the screwdriver connector operating area.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to an electric screwdriver. Background Technology

[0002] Electric screwdrivers, as a common power tool, are widely used in assembly, maintenance, and other operations to tighten or loosen screws, bolts, and other fasteners. A traditional electric screwdriver typically consists of a main body containing a drive motor, a connector at the front for mounting various screwdriver connector sizes, and a handle or grip for the user to hold and operate. The grip has a switch that controls the motor's start.

[0003] In actual operation, especially in narrow spaces with poor lighting conditions, inside equipment, or at night when working outdoors, operators have difficulty clearly seeing the position and condition of screws, making it difficult for the screwdriver head to be aligned with the screw head, which greatly reduces work efficiency and accuracy, and may even damage the screw or workpiece surface due to slippage. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an electric screwdriver that automatically provides lighting, is easy to operate, and saves energy.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An electric screwdriver, comprising: The main body has a plug-in portion at its front end, which is used to detachably install a screwdriver connector; A grip body is connected to the main body at a preset angle, and a start switch is provided on the surface of the grip body; A drive assembly is disposed inside the main body, and the output shaft of the drive assembly extends into the plug-in portion for connection with a screwdriver connector installed in the plug-in portion; A light-emitting device, wherein the light-emitting device is disposed on the main body; When the start switch is triggered, the light-emitting device is lit up and emits light towards the plug portion to provide illumination to the screwdriver connector operating area.

[0006] In a preferred embodiment, the main body includes a front housing and a rear housing that are connected to each other, wherein the cross-sectional diameter of the front housing is smaller than the cross-sectional diameter of the rear housing; Alternatively, the main body includes two side shells, the cross-section of which is semi-circular, and the two side shells are connected to form a circular main body.

[0007] In a preferred embodiment, a shock-absorbing component is provided between the output shaft and the main body, the shock-absorbing component comprising: A soundproof cover, which is fitted between the output shaft and the main body; An elastic element abuts between the soundproof cover and the main body; A vibration damping element is provided, which is filled between the output shaft and the soundproof cover.

[0008] In a preferred embodiment, the elastic element is a compression spring.

[0009] In a preferred embodiment, the preset angle is 90°-105°; And / or, the rear half of the main body is provided with heat dissipation holes; And / or, the cross-section of the grip is elliptical.

[0010] In a preferred embodiment, the power source of the drive assembly is located in the rear half of the main body. The rear half of the main body is a columnar structure, and its axial length L and the total length L0 of the main body satisfy the condition: 0.2L0≤L≤0.5L0.

[0011] In a preferred embodiment, the free end of the output shaft is provided with a mounting hole, which is connected to the screwdriver connector by a mechanical snap-fit ​​structure or a magnetic adsorption method.

[0012] In a preferred embodiment, the plug portion of the screwdriver connector is a polygonal groove.

[0013] In a preferred embodiment, the top of the grip is connected to the rear half of the main body, and the bottom of the grip is provided with a battery insertion part, which is provided with a charging interface.

[0014] In a preferred embodiment, the rear end of the main body is provided with a direction switch, and the rear end of the main body is also provided with arrow markings for clockwise and counterclockwise rotation.

[0015] In a preferred embodiment, the light-emitting device includes: A transistor having an emitter, a base, and a collector, wherein the collector is connected to the cathode of a battery; A magnetic ring, on which a primary winding and a secondary winding are wound, the end of the primary winding being connected to the anode of the battery, and the end of the secondary winding being connected to the base of the transistor; An electrical circuit includes multiple LEDs connected in series, arranged in a ring, with one end of the electrical circuit forming a common connection point with the emitter and the starting end of the primary winding of the transistor.

[0016] Compared with existing technologies, this technical solution has the following advantages: The light-emitting device, through the coordinated operation of a transistor, a magnetic ring, and an electrical circuit, achieves precise illumination of the screwdriver connector's operating area. When the operator triggers the start switch, the light accurately illuminates the work area, making bolts and other fasteners clearly visible, greatly improving alignment accuracy and work efficiency.

[0017] The free end of the output shaft is provided with a mounting hole, which connects to the screwdriver connector through a mechanical snap-fit ​​structure or magnetic adsorption, allowing the screwdriver connector to be replaced easily and quickly.

[0018] The rear end of the main body is equipped with a direction switch and arrows indicating clockwise and counterclockwise rotation. The two work together to make the signal clearer and more intuitive.

[0019] A shock-absorbing component is provided between the output shaft and the main body to reduce the transmission of vibration and reduce noise. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the electric screwdriver described in this utility model; Figure 2 This is an exploded view of the electric screwdriver described in this utility model; Figure 3 This is a bottom view of the electric screwdriver described in this utility model; Figure 4 This is a schematic diagram of the structure of the shock absorption component described in this utility model.

[0021] In the diagram: 100 Main body, 101 Plug-in part, 102 Direction switch, 100a Lower reference surface, 110 Front housing, 120 Rear housing, 130 Side housing, 200 Grip body, 200a Front reference surface, 201 Start switch, 210 Grip side housing, 301 Output shaft, 400 Light-emitting device, 500 Shock-absorbing component, 510 Soundproof cover, 520 Elastic element, 530 Shock-absorbing element, 540 Soundproofing sponge, 600 Battery insertion part. Detailed Implementation

[0022] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0023] Please refer to Figures 1 to 4 An embodiment of this utility model provides an electric screwdriver, comprising: The main body 100 has a plug-in portion 101 at its front end, which is used to detachably install a screwdriver connector. A grip body 200 is connected to the main body 100 at a preset angle, and a start switch 201 is provided on the surface of the grip body 200; A drive assembly is disposed inside the main body 100, and the output shaft 301 of the drive assembly extends into the plug portion 101 for connection with a screwdriver connector installed in the plug portion 101. A light-emitting device 400 is disposed on the main body 100; When the start switch 201 is triggered, the light-emitting device 400 is lit up and emits light towards the plug portion 101 to provide illumination to the screwdriver connector operating area.

[0024] After the operator holds the grip 200 and triggers the start switch 201, the light-emitting device 400 is activated and emits light towards the plug-in portion 101. This light illuminates the operating area of ​​the screwdriver connector, allowing the operator to clearly see the bolts or other fasteners to be worked on, thus accurately aligning the screwdriver connector with the fasteners and greatly improving work efficiency. After aligning the screwdriver connector, the operator can press the start switch 201 again, keeping the light-emitting device 400 in the light-emitting state. The output shaft 301 of the drive assembly rotates, causing the screwdriver connector mounted on the plug-in portion 101 to rotate, thereby tightening or loosening the fasteners. The light-emitting device 400 and the drive assembly stop working when the start switch 201 is pressed again.

[0025] refer to Figure 1 The light-emitting device 400 includes: A transistor having an emitter, a base, and a collector, wherein the collector is connected to the cathode of a battery; A magnetic ring, on which a primary winding and a secondary winding are wound, the end of the primary winding being connected to the anode of the battery, and the end of the secondary winding being connected to the base of the transistor; An electrical circuit includes multiple LEDs connected in series, arranged in a ring, with one end of the electrical circuit forming a common connection point with the emitter and the starting end of the primary winding of the transistor.

[0026] The transistor in the light-emitting device 400 functions as a switch and amplifier. By controlling the base current, it controls the current flow and magnitude between the collector and emitter, thereby controlling the LED's light-emitting state. When current flows through the primary winding, the magnetic ring generates a magnetic field, which induces an electromotive force in the secondary winding, providing current to the transistor's base and controlling its conduction and cutoff. Multiple LEDs can be simultaneously illuminated using battery power and strategically placed at the tool's tip to meet the tool's lighting needs in various working environments. Furthermore, this design, through its ingenious circuit structure and component configuration, effectively avoids excessive voltage consumption, achieving energy savings, extending battery life, and improving the tool's overall practicality and economy.

[0027] The start switch 201 is a multi-position switch with three states: off, first position, and second position. It is connected in series in the circuit between the battery and the drive component and the light-emitting device 400, serving to control the circuit and switch between different operating modes.

[0028] When the start switch 201 is in the off state, the circuit between the battery and the drive component and the light-emitting device 400 is disconnected. At this time, the drive component does not work, the output shaft 301 is stationary, the light-emitting device 400 does not emit light, and the entire device is in standby mode.

[0029] The operator holds the grip 200 and presses the start switch 201 for the first time, putting it in the first position. At this time, the battery and the primary winding of the light-emitting device 400 form a circuit, and current flows through the primary winding. The magnetic ring generates a magnetic field, inducing an electromotive force in the secondary winding, providing current to the base of the transistor, thus turning on the transistor. The current flows out from the positive terminal of the battery, through the primary winding, the collector-emitter junction of the transistor, the LED in the electrical circuit, and then back to the negative terminal of the battery. The LED is lit, emitting light towards the insertion part 101, illuminating the operating area of ​​the screwdriver connector, making it easier for the operator to accurately align the screwdriver connector with the fastener.

[0030] After aligning the screwdriver connector, the operator presses the start switch 201 again to switch it from the first gear to the second gear. Current flows from the positive terminal of the battery, through the circuit channel corresponding to the second gear of the start switch 201, and to the control circuit module of the drive assembly. The control circuit module rotates the output shaft 301 according to preset logic, which in turn drives the screwdriver connector installed in the plug part 101 to rotate, thereby tightening or loosening the fasteners. During the switch from the first gear to the second gear, through reasonable circuit design (such as setting a special contact connection method inside the start switch 201, or adding a logic judgment circuit in the control circuit module), it is ensured that the circuit between the battery and the light-emitting device 400 remains conductive at all times, that is, the light-emitting device 400 is continuously lit, providing continuous illumination to the operating area.

[0031] After the start switch 201 is reset to the off state, the drive component stops working, the output shaft 301 stops rotating, the light-emitting device 400 turns off, and the entire device returns to the initial standby state, waiting for the next operation.

[0032] Continue to refer to Figure 1 Multiple LEDs are arranged at the front end of the main body 100 and surround the plug portion 101 to provide illumination for the screwdriver connector operating area.

[0033] like Figures 1 to 3 As shown, the battery is located inside the grip 200 and can be a rechargeable battery, such as a lithium battery. The battery provides power to the drive assembly, the light-emitting device 400, etc.

[0034] The top of the grip 200 is connected to the rear half of the main body 100, and the bottom of the grip 200 has a battery insertion part 600. The battery insertion part 600 can be designed as a cover for opening and closing the opening at the bottom of the grip 200. When it is necessary to install the battery, the battery insertion part 600 can be removed to place the battery inside the grip 200. The battery insertion part 600 and the bottom opening of the grip 200 can be connected by a snap or thread. The battery insertion part 600 also has a charging interface for charging the battery.

[0035] The charging interface can be a common USB interface, Type-C interface, etc., for easy connection to an external charger.

[0036] The Type-C interface features a symmetrical design, allowing for reversible insertion. This greatly enhances user convenience, avoiding time wastage and the risk of interface damage caused by repeatedly trying different insertion directions.

[0037] Furthermore, this interface supports high-power power transfer, providing fast and efficient charging for devices. Whether it's smartphones, tablets, or laptops, all devices can be quickly charged through this interface, truly achieving multi-purpose functionality with a single cable. This effectively simplifies the device connection process, reduces the burden on users carrying multiple cables, and enhances the overall user experience.

[0038] The free end of the output shaft is provided with a mounting hole, which connects to the screwdriver connector via a mechanical snap-fit ​​structure or magnetic adsorption. This connection design allows for easy and quick replacement of the screwdriver connector, meeting the needs of various types of screwdriver connectors in different working scenarios.

[0039] The screwdriver connector includes a plug for connecting a screwdriver. The screwdriver is a type of screwdriver, including different models such as flathead and Phillips head.

[0040] The screwdriver connector's insertion part has a polygonal groove structure, specifically a concave hexagonal shape. Compared to a pentagonal shape, the hexagonal structure provides a larger contact area and a more uniform force distribution when mated with the connector. This characteristic allows for a stronger, tighter connection between screwdriver connectors, effectively maintaining good torque transmission efficiency and ensuring sufficient and stable torque is applied during tightening or loosening of fasteners, improving work quality and reliability. Due to the multi-point contact characteristics of the hexagonal structure, stress is better dispersed when mated with the connector, reducing the risk of stripping caused by localized stress concentration. The concave hexagonal design makes the screwdriver connector surface smooth and aesthetically pleasing, while its stable structure ensures that it is not prone to shaking or deformation during operation, providing operators with a more stable and reliable working experience.

[0041] like Figure 1 As shown, the rear end of the main body 100 is provided with a direction switch 102, and the rear end of the main body 100 is also provided with arrow markings for clockwise and counterclockwise rotation.

[0042] The direction switch 102 is used to control the clockwise or counterclockwise rotation of the output shaft 301. When the direction switch 102 is moved to the corresponding clockwise position, the output shaft 301 is driven to rotate clockwise. At this time, the screwdriver mounted on the screwdriver connector will rotate synchronously, applying clockwise torque to the fastener, thereby realizing the tightening operation of the fastener.

[0043] Conversely, when the user moves the direction switch 102 to the corresponding counter-clockwise rotation position, the rotation direction of the output shaft 301 is changed, causing it to rotate counter-clockwise. The screwdriver will also rotate counter-clockwise, applying counter-clockwise torque to the fastener, thereby loosening the fastener.

[0044] Compared to a single arrow symbol, this arrow symbol, which clearly distinguishes between clockwise and counterclockwise directions, is clearer and more intuitive, and can greatly improve the user's visual recognition efficiency.

[0045] The main body 100 can be assembled from multiple components, a design that offers numerous advantages, such as ease of manufacturing, repair, and replacement. The following two embodiments illustrate the assembly structure of the main body 100. First Embodiment like Figure 1 As shown, the main body 100 includes a front housing 110 and a rear housing 120 that are connected to each other, and the front housing 110 and the rear housing 120 are spliced ​​along the axial direction of the main body 100.

[0046] The power source of the drive assembly can be installed within the rear housing 120. The output shaft 301 of the drive assembly is arranged within the front housing 110. The front end of the front housing 110 is provided with the insertion portion 101 so that the output shaft 301 can extend into the insertion portion 101. The size of the power source of the drive assembly is much larger than the size of the output shaft 301. To make reasonable use of space, the cross-sectional diameter of the front housing 110 is smaller than the cross-sectional diameter of the rear housing 120.

[0047] The front housing 110 and the rear housing 120 can be made of materials such as plastic. Plastic is lightweight, which can effectively reduce the overall weight of the electric screwdriver compared to traditional materials such as metal. The front housing 110 and the rear housing 120 can be injection molded separately or as a single piece. In separate molding, the front housing 110 and the rear housing 120 are connected by means of hot melting or snap-fit.

[0048] During the assembly process, internal components such as the drive assembly can be installed in the rear housing 120 first, and then the front housing 110 can be spliced ​​with it to complete the assembly of the main body 100.

[0049] The cross-section of the main body 100 is circular, square, or the like. When the cross-section of the main body 100 is circular, the cross-sections of the front housing 110 and the rear housing 120 are also circular.

[0050] like Figure 1 As shown, the grip body 200 can also be made of plastic, and the rear shell 120 and the grip body 200 can also be connected by means of heat fusion or snap fasteners.

[0051] The top of the grip 200 is connected to the rear housing 120, meaning that the power source arranged in the rear housing 120 is located above the grip 200.

[0052] Second Embodiment like Figure 2 As shown, the main body of the second embodiment differs from that of the first embodiment in that the main body 100 includes two side shells 130, the cross-section of the side shells 130 is semi-circular, and the two side shells 130 are connected to form a circular main body 100.

[0053] refer to Figure 2 The grip body 200 also adopts a split-assembly design, consisting of two grip side shells 210. Taking an elliptical cross-section as an example, the grip side shells 210 are semi-elliptical, meaning that two semi-elliptical grip side shells 210 are joined together to form an elliptical grip body 200. This elliptical cross-section design of the grip body 200 closely conforms to the physiological curves of the hand muscles, effectively distributing the pressure on the hand during gripping, thus significantly enhancing comfort.

[0054] To improve the overall integrity and stability of the structure, each of the side shells 130 and one of the gripping side shells 210 are integrally connected to form a half shell, and the two half shells are spliced ​​together by means of heat fusion or snap fastening.

[0055] Similarly, the connector 101 is also divided into two parts. During assembly, internal components such as the drive assembly can be installed in one half-shell first, and then the other half-shell can be joined to it to complete the assembly of the entire electric screwdriver. This split design not only improves production efficiency but also provides convenience for subsequent maintenance and upgrades.

[0056] like Figure 1 As shown, the drive assembly is powered by a motor, which is located in the rear half of the main body 100. That is, the power source of the drive assembly is enclosed by the rear half of the main body 100, preventing the motor from being impacted and thus protecting the power source.

[0057] The rear half of the main body 100 is a columnar structure, and the axial length L of the rear half of the main body 100 and the total length L0 of the main body satisfy the following condition: 0.2L0≤L≤0.5L0.

[0058] The rear half of the main body 100 is provided with heat dissipation holes, which helps to dissipate the heat generated by the drive component during movement.

[0059] The rear half of the main body 100 has a wavy outline, with heat dissipation holes at the troughs. Alternatively, the rear half of the main body 100 can be composed of multiple wavy iron wires arranged in parallel or interlaced patterns, with heat dissipation holes formed between adjacent wires.

[0060] like Figure 1As shown, the grip 200 is connected to the main body 100 at a preset angle, which is ergonomically optimized and typically between 90° and 105°. This angle design allows the operator's wrist to be in a natural and comfortable position when holding the electric screwdriver, reducing fatigue from prolonged work and improving work comfort and efficiency.

[0061] The grip 200 has a front reference surface 200a facing the plug-in portion 101, and the main body 100 has a lower reference surface 100a facing downward. The angle between the front reference surface 200a and the lower reference surface 100a is the preset angle.

[0062] refer to Figure 1 The start switch 201 is disposed on the front reference surface 200a of the grip body 200 and adjacent to the main body 100, corresponding to the fingers of the operator holding the grip body 200.

[0063] like Figure 4 As shown, a shock-absorbing assembly 500 is provided between the output shaft 301 and the main body 100, and the shock-absorbing assembly 500 includes: A soundproof cover 510 is sleeved between the output shaft 301 and the main body 100; Elastic element 520, which abuts between the soundproof cover 510 and the main body 100; A vibration damping element 530 is filled between the output shaft 301 and the soundproof cover 510.

[0064] The soundproof cover 510 is annular and made of a high-density, high-sound-insulating material, such as a plastic composite material or a metal soundproofing panel with good sound insulation properties. The function of the soundproof cover 510 is to effectively block the transmission of noise generated during the operation of the output shaft 301, etc.

[0065] The elastic element 520 is a compression spring, and there are multiple of them, which are spaced apart along the circumference of the soundproof cover 510. When the output shaft is subjected to external impact or vibration, it can absorb and disperse part of the energy through its own elastic deformation, thereby reducing the transmission of vibration to the main body 100, playing a buffering and shock-absorbing role, and protecting the main body 100 and other related components from vibration damage.

[0066] The damping element 530 is made of polyurethane (PU) elastomer material, which has good elasticity and damping characteristics. It can tightly wrap the output shaft 301, reducing the relative movement between the output shaft 301 and the soundproof cover 510. When the output shaft 301 vibrates, the damping element 530 will convert the vibration energy into heat or other forms of energy through its own damping characteristics, thereby further reducing the transmission of vibration and enhancing the damping effect.

[0067] A sound-absorbing sponge 540 is also provided between the shock-absorbing element 530 and the soundproof cover 510 to further reduce noise generation.

[0068] The embodiments described above are only used to illustrate the technical ideas and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. The scope of patent application of this utility model should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in this utility model still fall within the patent scope of this utility model.

Claims

1. An electric screwdriver, characterized in that, include: The main body (100) has a plug-in portion (101) at its front end, which is used to detachably install a screwdriver connector; A grip (200) is connected to the main body (100) at a preset angle, and a start switch (201) is provided on the surface of the grip (200). A drive assembly is disposed inside the main body (100), and the output shaft (301) of the drive assembly extends into the plug portion (101) for connection with a screwdriver connector installed in the plug portion (101). A light-emitting device (400) is disposed on the main body (100); When the start switch (201) is triggered, the light-emitting device (400) is lit up and emits light toward the plug (101) to provide illumination to the screwdriver connector operating area.

2. The electric screwdriver as described in claim 1, characterized in that, The main body (100) includes a front housing (110) and a rear housing (120) that are in contact with each other, wherein the cross-sectional diameter of the front housing (110) is smaller than the cross-sectional diameter of the rear housing (120); Alternatively, the main body (100) includes two side shells (130), the cross-section of which is semi-annular, and the two side shells (130) are connected to form a circular main body (100).

3. The electric screwdriver as described in claim 1, characterized in that, A shock-absorbing assembly (500) is provided between the output shaft (301) and the main body (100), the shock-absorbing assembly (500) comprising: A soundproof cover (510) is fitted between the output shaft (301) and the main body (100); An elastic element (520) abuts between the soundproof cover (510) and the main body (100); A damping element (530) is filled between the output shaft (301) and the soundproof cover (510).

4. The electric screwdriver as described in claim 3, characterized in that, The elastic element (520) is a compression spring.

5. The electric screwdriver as described in claim 1, characterized in that, The preset angle is 90°-105°; And / or, the rear half of the main body (100) is provided with heat dissipation holes; And / or, the cross-section of the grip (200) is elliptical.

6. The electric screwdriver as described in claim 1, characterized in that, The power of the drive component is located in the rear half of the main body (100). The rear half of the main body (100) is a columnar structure, and its axial length L and the total length L0 of the main body satisfy: 0.2L0≤L≤0.5L0.

7. The electric screwdriver as described in claim 1, characterized in that, The free end of the output shaft is provided with a mounting hole, which is connected to the screwdriver connector by a mechanical snap-fit ​​structure or magnetic adsorption.

8. The electric screwdriver as described in claim 1, characterized in that, The plug portion of the screwdriver connector is a polygonal groove.

9. The electric screwdriver as described in claim 1, characterized in that, The top of the grip (200) is connected to the rear half of the main body (100), and the bottom of the grip (200) is provided with a battery insertion part (600), which is provided with a charging interface.

10. The electric screwdriver as claimed in claim 1, characterized in that, The rear end of the main body (100) is provided with a direction switch (102), and the rear end of the main body (100) is also provided with arrow markings for clockwise and counterclockwise rotation.

11. The electric screwdriver as claimed in claim 1, characterized in that, The light-emitting device (400) includes: A transistor having an emitter, a base, and a collector, wherein the collector is connected to the cathode of a battery; A magnetic ring, on which a primary winding and a secondary winding are wound, the end of the primary winding being connected to the anode of the battery, and the end of the secondary winding being connected to the base of the transistor; An electrical circuit includes multiple LEDs connected in series, arranged in a ring, with one end of the electrical circuit forming a common connection point with the emitter and the starting end of the primary winding of the transistor.

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