A handheld electric brush with adjustable angle

Abstract

Handheld electric brush with adjustable angle, characterized in that it comprises: a hand body and a brush head, wherein one side of the hand body is rotatably connected to an electrical main unit, the other side of the hand body is connected via a detachable connection to a telescopic handle mechanism, and the brush head is attached to the outlet of the electrical main unit; further comprising a rotary mechanism having a release switch, a toothed locking bolt, a locking chamber, a release chamber and a return spring, wherein the release switch is arranged on the upper side of the hand body, the locking chamber is provided on the inside, the effective section of the release switch extends inwards into the locking chamber, and the release chamber is formed at an inner end of the electrical main unit.wherein the locking chamber and the unlocking chamber are connected longitudinally, wherein a pivot axis is further arranged in the unlocking chamber which extends upwards into the locking chamber, the toothed locking bolt is mounted on the pivot axis, a first tooth is provided in the locking chamber and a second tooth in the unlocking chamber, the toothed locking bolt has a switch tooth which can be brought into toothing with the first tooth or the second tooth, wherein the return spring is furthermore mounted on the pivot axis in the unlocking chamber, wherein the return spring pushes the toothed locking bolt upwards into its initial position in order to be simultaneously in toothing with the first tooth and the second tooth and thereby effect a locking between the electrical main part and the hand body, or by pressing the unlocking switch the toothed locking bolt is moved downwards,to exit the unlocking chamber and thereby cause an unlocking between the main electrical unit and the hand body.

Description

Technology sector The present utility model relates to the technical field of electric brushes, in particular a handheld electric brush with an adjustable angle. Technical background In daily life and industrial production, handheld electric brushes are frequently used in scenarios such as cleaning and application due to their energy-saving and efficient properties. Examples include cleaning kitchen ovens, treating the inside walls of long cylindrical containers, and coating food with oil or spices. Currently, a wide variety of handheld electric brushes are available on the market; however, in practical use, they still exhibit many technical shortcomings that urgently need to be addressed to meet the diverse and user-friendly requirements of users. The following disadvantages exist in the use of state-of-the-art electric brushes: 1. Inconvenient angle adjustment: Many cleaning or application scenarios (e.g., oven interiors, pipe interiors, high walls, etc.) require the brush head to enter the work area at a specific angle. Although some electric brushes are equipped with an angle adjustment mechanism, locking is usually achieved via a rotary knob or a separate switch, which is cumbersome to operate. Especially when the operator's hands are contaminated with oil or cleaning agents, applying precise force for adjustment is difficult, and there is a risk of re-contamination. An intuitive, quick, and non-soiling "one-button" solution for angle adjustment is lacking. 2. Limited application range, lack of a handle extension: For deep containers (e.g.,In situations requiring operation from a greater distance (e.g., deep buckets, oven depths, long cylindrical devices), the standard handle of the hand unit cannot reach the target area. Most existing products have a fixed handle length that cannot be adjusted to the actual requirements, forcing the user to lean forward excessively or use auxiliary tools – which is not only uncomfortable but also poses a safety risk when in contact with hot ovens. At the same time, there is no mechanism that can flexibly adjust the angle between the extended handle and the brush head to accommodate different operating positions. To solve the aforementioned technical problems, a handheld electric brush with an adjustable angle is being developed. Content of the utility model The technical problem solved by the present utility model is to provide a handheld electric brush with an adjustable angle, overcoming the disadvantages of the prior art. To solve the aforementioned technical problem, the present utility model provides a handheld electric brush with an adjustable angle, comprising: a hand body and a brush head, wherein one side of the hand body is rotatably connected to an electrical main unit, the other side of the hand body is connected via a detachable connection to a telescopic handle mechanism, and the brush head is attached to the outlet of the electrical main unit; further comprising a rotary mechanism having a release switch, a toothed locking bolt, a locking chamber, a release chamber, and a return spring, wherein the release switch is arranged on the upper side of the hand body and the locking chamber is provided on the inside, the effective section of the release switch extending inwards into the locking chamber, and the release chamber is formed at an inner end of the electrical main unit.wherein the locking chamber and the unlocking chamber are connected longitudinally, wherein a pivot axis is further arranged in the unlocking chamber which extends upwards into the locking chamber, the toothed locking bolt is mounted on the pivot axis, a first tooth is provided in the locking chamber and a second tooth in the unlocking chamber, the toothed locking bolt has a switch tooth which can be brought into toothing with the first tooth or the second tooth, wherein the return spring is furthermore mounted on the pivot axis in the unlocking chamber, wherein the return spring pushes the toothed locking bolt upwards into its initial position in order to be simultaneously in toothing with the first tooth and the second tooth and thereby effect a locking between the electrical main part and the hand body, or by pressing the unlocking switch the toothed locking bolt is moved downwards,to exit the unlocking chamber and thereby cause an unlocking between the main electrical unit and the hand body. As an improvement: The end of the hand body, which is connected to the telescopic handle mechanism, is provided with a screw hole;The telescopic handle mechanism comprises a telescopic rod, a connecting head, an adjusting screw, and an adjusting nut, wherein one end of the telescopic rod is provided with a connecting groove, one end of the connecting head is arranged in the connecting groove, the end of the telescopic rod with the connecting groove is provided with a slot through the telescopic rod and the connecting head, the adjusting screw is arranged in the slot, the connecting head and the telescopic rod are rotatably connected via the adjusting screw, a nut stop groove is provided on one side of the telescopic rod, outside the slot, in which a stop nut screwed to the adjusting screw is arranged, the other end of the connecting head is provided with a threaded bolt which is screwed into the screw hole, and an adjusting nut is screwed onto the threaded bolt to fix the alignment of the connecting head. As an improvement: A switch groove is provided on the upper side of the hand body, in which a locking hole and a pressure opening are arranged; the release switch comprises a pressure part, a locking part and a contact part, wherein the contact part enters the locking chamber through the pressure opening and rests against the upper end face of the toothed locking bolt; the locking part interacts with the locking hole to prevent the release switch from coming loose. As an improvement: A guide tooth block is provided on the outside of the axis of rotation, and a guide tooth is formed on the inside of the toothed locking bolt, with the guide tooth being toothed with the guide tooth block to effect the longitudinal sliding guidance of the toothed locking bolt and to prevent the toothed locking bolt from rotating relative to the axis of rotation. As an improvement: A locking base is provided on the inside of the hand body, in which a recess forms the locking chamber; the first tooth is arranged circularly on the inner circumferential surface of the locking chamber; a rotary groove is formed at the lower end of the locking base, inside the hand body; a release base is provided at the upper end of the main electrical part, which has the second tooth; the release base extends upwards into the rotary groove and, together with the rotary groove, encloses the release chamber. As an improvement: The unlocking base is a semicircular base body, the switch tooth is an arrangement of teeth in the shape of a semicircular arc on the outside of the toothed locking bolt. As an improvement: A motor assembly is arranged within the main electrical part, and a control board, a battery and a control switch are also arranged within the hand body, wherein the motor assembly is electrically connected to the control board, the output of the motor assembly is connected to the brush head, the control switch is electrically connected to the control board, and the battery is electrically connected to the control board. As an improvement: A protective hood is provided on the outside of the brush head. The protective hood has a hood part and a connecting part, with a receiving hole formed inside the connecting part. Outside the receiving hole, a receiving groove is provided. A damping cam is arranged on one side of the receiving groove. The main electrical part is provided with an end cap on its outer section. On the end cap, an axle hole, an inner connection, and an outer connection are arranged successively. The outer connection is provided with an annular damping toothing. The axle hole serves for the passage of the output shaft of the motor assembly. The inner connection serves for insertion into the receiving hole of the protective hood. The outer connection serves for insertion into the receiving groove, whereby, when inserted, the damping cam interacts with the annular damping toothing in a friction-fit damping effect. As an improvement: Inside the end of the hood part furthest from the connecting part, a sliding groove is provided; a telescopic protective hood is arranged at this end of the hood part; the telescopic protective hood is provided at one end with a sliding element that is inserted into the sliding groove and can be moved back and forth within the sliding groove; several rubber strips are evenly distributed on the top of the sliding element, which interact with the top wall of the sliding groove to allow positioning after movement of the telescopic protective hood; a first limiting block is provided symmetrically on both sides of the end furthest from the sliding groove; a second limiting block is provided symmetrically on both sides of the end of the sliding element located in the sliding groove, with the second limiting block and the first limiting block being offset from each other to prevent the sliding element from being completely pulled out of the sliding groove. As an improvement: The hand body comprises a hand end, a transition end and a connecting end, wherein the hand end has a handle, the connecting end serves for rotatable connection with the electrical main part, the release switch being located at the connecting end, the transition end being located between the hand end and the connecting end and assuming a connecting and transition function to effect a height offset between the hand end and the connecting end. The advantages of the present utility model over the prior art are as follows: The electric brush according to the invention, through direct pressure release and locking return, allows the operator to fully engage the inner toothed locking pin in the release chamber by simply pressing the release switch. This disengages the switch tooth on the toothed locking pin from the first tooth, allowing the underlying main electrical component to rotate relative to the hand. When the release switch is released, the toothed locking pin springs back upwards, with its upper part entering the locking chamber and engaging with the first tooth, while the lower part remains in the release chamber and engages with the second tooth – thus establishing the locking mechanism.The operation is extremely simple, the hands do not get dirty, and unlocking for turning is done simply by pressing the unlock switch; releasing the unlock switch immediately locks it. On the other side of the handle is a telescopic handle mechanism attached via a detachable connection. When extended use is required, the telescopic handle can be attached to the handle and extended. This allows for cleaning particularly large or deep ovens or long cylindrical containers. It can also be used for brushing food with oil or spices in deep ovens. This not only facilitates the application of oil and spices but also avoids direct heat from the hot oven – making it more convenient and user-friendly. The design, incorporating an adjustment screw, allows the telescopic pole to be swiveled vertically. An additional adjustment nut enables positioning of the connecting head, allowing it to be securely fixed in any direction (0-360 degrees). This allows the telescopic pole to be rotated around the adjustment screw at any desired vertical angle. The adjustment is more flexible, and the angle between the telescopic pole and brush head can be better adapted to the specific application, further simplifying handling. The hood section features a telescopic protective cover that can be moved back and forth in the sliding groove. When the top of the brush head is needed for cleaning or applying spices, the sliding part of the telescopic protective cover can be fully retracted into the groove, ensuring the hood section doesn't obstruct the brush head and provides unobstructed access. When the brush head isn't needed, the telescopic protective cover can be extended to completely cover the brush head. This prevents splashes of water, oil, spices, etc., that the brush head would otherwise fling away, resulting in a more hygienic solution. Explanation of the figures Fig. 1 is a perspective schematic diagram of the handheld electric brush with adjustable angle according to the present utility model. Fig. 2 is a top view of the handheld electric brush with adjustable angle according to the present utility model after disassembly of the telescopic handle mechanism. Fig. 3 is a side view of the handheld electric brush with adjustable angle according to the present utility model after disassembly of the telescopic handle mechanism. Fig. 4 is a perspective view of the handheld electric brush with adjustable angle according to the present utility model after disassembly of the telescopic handle mechanism. Fig. 5 is a disassembled reference view of the handheld electric brush with adjustable angle according to the present utility model after disassembly of the telescopic handle mechanism.Figure 6 is a disassembled state reference drawing of the hand body of the handheld electric brush with adjustable angle according to the present utility model. Figure 7 is a disassembled state reference drawing of the brush head and the protective cover of the handheld electric brush with adjustable angle according to the present utility model. Figure 8 is a disassembled state reference drawing of the telescopic handle mechanism of the handheld electric brush with adjustable angle according to the present utility model. Figure 9 is a disassembled state reference drawing of the main electrical component of the handheld electric brush with adjustable angle according to the present utility model. Figure 10 is a perspective view of the control switch of the handheld electric brush with adjustable angle according to the present utility model. Figure 11 is a sectional view along line AA in Figure 2.Figure 12 is an enlarged partial view of detail B in Figure 11. Figure 13 is an enlarged partial view of detail C in Figure 5. Figure 14 is an enlarged partial view of detail D in Figure 5. Figure 15 is an enlarged partial view of detail E in Figure 5. Figure 16 is an enlarged partial view of detail F in Figure 5. Figure 17 is a first state reference view of the handheld electric brush with adjustable angle according to the present utility model in use. Figure 18 is a second state reference view of the handheld electric brush with adjustable angle according to the present utility model in use. Figure 19 is a third state reference view of the handheld electric brush with adjustable angle according to the present utility model in use. 100, Hand body; 101, Screw hole; 102, Switch groove; 103, Locking hole; 104, Pressure opening; 105, Pressure part; 106, Locking part; 107, Mounting part; 108, Locking base; 108a, Rotary groove; 109, Control board; 110, Battery; 111, Control switch; 112, Hand end; 113, Transition end; 114, Connecting end; 115, Handle; 116, Rotary shaft opening; 200, Brush head; 201, Protective cover; 202, Cover part; 203, Connecting part; 204, Mounting hole; 205, Mounting groove; 206, Damping cam; 207, Sliding groove; 208, Telescopic protective cover; 209, Sliding part; 210, rubber strip; 211, first limit block; 212, second limit block; 300, main electrical unit; 301, release base; 302, motor assembly; 303, end cap; 304, axle hole; 305, internal connection; 306, external connection; 307, output shaft; 308, annular damping teeth; 400, telescopic handle mechanism; 401, telescopic rod; 402, connecting head; 403, adjusting screw; 404, adjusting nut; 405, connecting groove; 406, socket hole;407, nut limit groove; 408, limit nut; 500, rotary mechanism; 501, release switch; 502, toothed locking bolt; 502a, guide tooth; 503, locking chamber; 504, release chamber; 505, return spring; 506, pivot axis; 506a, guide tooth block; 507, first tooth; 508, second tooth; 509, switch tooth; Specific details The handheld electric brush with adjustable angle according to the present utility model is explained in more detail below with reference to the attached drawings. With reference to Fig. 1-19, a handheld electric brush with adjustable angle comprises a hand body 100 and a brush head 200, wherein one side of the hand body 100 is rotatably connected to an electrical main unit 300, the other side of the hand body 100 is connected via a detachable connection to a telescopic handle mechanism 400, and the brush head 200 is attached to the outlet of the electrical main unit 300; furthermore, it comprises a rotary mechanism 500 for locking and unlocking between the electrical main unit 300 and the hand body 100, wherein the individual components interact to achieve a multifunctional integration of angle adjustment, length adjustment, protection, etc., and to improve ease of use and practicality.Structural design and operating principle of the hand unit 100: The hand unit 100 comprises a hand end 112, a transition end 113, and a connecting end 114, the hand end 112 having a handle 115. The surface of the handle 115 can be provided with a non-slip structure to increase friction between the hand and the hand end 112, prevent the electric brush from slipping due to vibrations during operation, improve grip comfort, and reduce fatigue during prolonged use. The connecting end 114 serves for a rotatable connection with the main electrical unit 300, with the release switch 501 being located at the connecting end 114 so that the operator can quickly press the release switch 501 with their thumb while holding the hand end 112 to adjust the angle. The transition end 113 is located between the hand end 112 and the connecting end 114 and serves as a connection and transition point to create a height difference between the hand end 112 and the connecting end 114. Preferably, the hand end is positioned above the main electrical component 300. This arrangement allows, on the one hand, the underlying main electrical component 300 and the brush head 200 to act directly on the object being processed when the hand end is grasped by hand, while simultaneously preventing dirt from splashing onto the hand; on the other hand, it also simplifies the spatial arrangement of the design, so that the release switch 501 can be actuated by simply pressing it with the thumb. Inside the hand unit 100 are a control board 109, a battery 110, and a control switch 111. The motor assembly 302 is electrically connected to the control board 109, and the output of the motor assembly 302 is connected to the brush head 200 – preferably by means of a quick-connect fitting. The control switch 111 is electrically connected to the control board 109 and is located above the hand unit 100, allowing the operator to switch the electric brush on and off at any time. The battery 110 is electrically connected to the control board 109 and is a rechargeable lithium-ion battery with high capacity and long operating time. It is also easy to charge and reusable, thus aligning with the environmentally friendly concept.The control board 109 is a conventional electrical control circuit board used to regulate the speed of the motor assembly 302, allowing the speed of the brush head 200 to be adjusted according to cleaning or job requirements. The motor assembly 302, the control switch 111, and the battery 110 are all electrically connected to the control board 109, forming a complete electrical control system. Pressing the control switch 111 starts the motor assembly 302, causing the brush head 200 to rotate – operation is simple and convenient. The end of the hand body 100, which is connected to the telescopic handle mechanism 400, is provided with a screw hole 101. More precisely, the screw hole 101 is located at the rear end of the hand end 112; it serves for screwing it to the threaded bolt 409 of the telescopic handle mechanism 400, in order to allow for detachable assembly of the telescopic handle mechanism 400. A switch groove 102 is provided on the upper side of the hand body 100, in which a locking hole 103 and a pressure opening 104 are arranged. The release switch 501 comprises a pressure part 105, a locking part 106, and a contact part 107, wherein the contact part 107 extends through the pressure opening 104 into the locking chamber 503 and rests against the upper end face of the toothed locking bolt 502. The locking part 106 interacts with the locking hole 103 to prevent the release switch 501 from being released. More precisely, the locking part 106 is an outwardly angled block element, while the pressure part 105 is the uppermost surface intended for pressing with a finger; the pressure part 105 forms the main body of the entire release switch 501. Preferably, the release switch 501 is cylindrical.The attachment part 107 is a pin extending downwards from the underside of the pressure part 105; preferably three such pins are provided, each passing through the pressure opening 104 – this arrangement is more stable. Inside the hand body 100, a locking base 108 is provided. A recess is formed in the locking base 108, forming the locking chamber 503. The locking chamber 503 is located directly below the switch groove 102. The first tooth 507 is arranged circularly on the inner circumferential surface of the locking chamber 503. At the lower end of the locking base 108, inside the hand body 100, a rotary groove 108a is formed. At the upper end of the electrical main part 300, a release base 301 is provided, which has the second tooth 508. The release base 301 extends upwards into the rotary groove 108a and, together with the rotary groove 108a, encloses the release chamber 504. II. Structural design and operating principle of the rotary mechanism 500: Furthermore, a rotary mechanism 500 is provided. The rotary mechanism 500 comprises a release switch 501, a toothed locking bolt 502, a locking chamber 503, a release chamber 504, and a return spring 505. The individual components work together to enable quick locking and unlocking between the main electrical unit 300 and the hand unit 100, and thus angle adjustment of the brush head 200. In detail: The release switch 501 is arranged on the upper side of the hand body 100. The locking base 108 is provided inside the hand body 100, and the recess in the locking base 108 forms the locking chamber 503. The functional section of the unlocking switch 501 extends inwards into the locking chamber 503. The unlocking chamber 504 is formed at an inner end of the electrical main part 300, with the locking chamber 503 and the unlocking chamber 504 being longitudinally connected to each other. A pivot axis 506 is also arranged in the unlocking chamber 504. One end of the pivot axis 506 is fixedly connected to the electrical main part 300. The pivot axis 506 extends upwards into the locking chamber 503. The toothed locking bolt 502 is mounted on the pivot axis 506 and can slide longitudinally on the pivot axis 506. A guide tooth block 506a is provided on the outside of the pivot axis 506. A guide tooth 502a is formed on the inside of the toothed locking bolt 502. The guide tooth 502a is interlocked with the guide tooth block 506a.This serves, on the one hand, to guide the toothed locking bolt 502 longitudinally, preventing it from tilting or shifting during sliding, and on the other hand, to prevent the toothed locking bolt 502 from rotating relative to the axis of rotation 506. This ensures that the switch tooth 509 on the toothed locking bolt 502 can engage precisely with the first tooth 507 and the second tooth 508, thus guaranteeing the reliability of the locking and unlocking process. In detail: Since the toothed locking bolt 502 is mounted on the outside of the pivot axis 506, the handpiece 100 can continue to rotate about the pivot axis 506 when the toothed locking bolt 502 is pressed downwards and fully enters the unlocking chamber 504 – the height of the pivot axis 506 does not change. In other words, the main electrical part 300 rotates together with the pivot axis 506 about the axis of the pivot axis 506. To prevent the handpiece 100 from falling off the main electrical part 300 in the absence of a vertical connection, a locking device can be provided between the handpiece 100 and the main electrical part 300. In a preferred locking device, a ring rail can be arranged on one side and an annular groove on the other side.In another embodiment, the axis of rotation 506 can be guided upwards through an axis of rotation opening 116 into the switch groove 102, and a locking nut can be screwed onto the axis of rotation 506 in the switch groove 102, optionally with a washer, so that rotation of the two body parts relative to each other remains possible and at the same time prevents them from falling off. A first tooth 507 is provided in the locking chamber 503, and a second tooth 508 in the unlocking chamber 504. The toothed locking bolt 502 has a switching tooth 509 that can engage with either the first tooth 507 or the second tooth 508. The unlocking base 301 is a semicircular base body. The switching tooth 509 is an arrangement of teeth in the form of a semicircular arc on the outside of the toothed locking bolt 502. This arrangement allows the main electrical part 300 to be rotated 90 degrees clockwise and counterclockwise relative to the hand body 100, both in the vertical direction. This enables the desired angle of rotation so that the brush head 200 can be aligned in an L-shape with the handle to reach edges, while simultaneously preventing excessively large angles of rotation and thus avoiding damage to the internal wires. Furthermore, a return spring 505 is mounted on the pivot axis 506 in the unlocking chamber 504. The return spring 505 is located on the lower end face of the toothed locking bolt 502. The return spring 505 can push the toothed locking bolt 502 upwards into its initial position, so that it simultaneously engages with the first tooth 507 and the second tooth 508, thereby creating a locking mechanism between the main electrical unit 300 and the hand unit 100. This means that when the toothed locking bolt 502 returns upwards, its upper part enters the locking chamber 503 and engages with the first tooth 507, while its lower part remains in the unlocking chamber 504 and engages with the second tooth 508. Since both the upper first tooth 507 and the lower second tooth 508 are locked, the hand body 100 and the main electrical part 300 are locked against each other and cannot rotate.Alternatively, by pressing the release switch the toothed locking bolt 502 can be moved downwards to exit the release chamber 504, thereby releasing the electrical main unit 300 and the hand body 100. The operating principle of the rotary mechanism 500 is as follows: In its normal state, the return spring 505 is relaxed and pushes the toothed locking bolt 502 upwards into its initial position. The upper part of the toothed locking bolt 502 protrudes into the locking chamber 503, and the switch tooth 509 engages with the first tooth 507 in the locking chamber 503. The lower part of the toothed locking bolt 502 remains in the unlocking chamber 504, and the switch tooth 509 engages with the second tooth 508 in the unlocking chamber 504. This creates a locking connection between the main electrical unit 300 and the hand unit 100; the main electrical unit 300 cannot rotate relative to the hand unit 100, thus ensuring stability during use. To adjust the angle of the brush head 200, the operator presses their thumb on the pressure part 105 of the release switch 501. The pressure part 105 moves the contact part 107 downwards, and the contact part 107 pushes the toothed locking bolt 502 downwards along the axis of rotation 506, compressing the return spring 505 until the toothed locking bolt 502 fully engages in the release chamber 504. The switch tooth 509 then disengages from the first tooth 507 in the locking chamber 503, and the lock between the electrical main unit 300 and the hand body 100 is released. The operator can now rotate the electrical main unit 300, causing the brush head 200 to rotate in the connection between the rotary groove 108a and the release base 301. After adjusting to the desired angle, the release switch 501 is released.The return spring 505 returns to its relaxed state and pushes the toothed locking bolt 502 upwards into its initial position. The switch tooth 509 re-engages with the first tooth 507 and the second tooth 508, the locking mechanism is engaged, and the angle of the brush head 200 is fixed. The entire adjustment process requires no tools, is simple and convenient, does not soil the operator's hands, and is highly efficient. III. Structure and function of the telescopic handle mechanism 400: The telescopic handle mechanism 400 comprises a telescopic rod 401, a connecting head 402, an adjusting screw 403 and an adjusting nut 404. It allows length and angle adjustment of the handle to adapt to different application scenarios. The 401 telescopic pole is designed as a multi-section, telescopic structure whose length can be adjusted as needed. For example, the 401 telescopic pole can be extended to clean deep ovens or long cylindrical containers, or to apply oil and spices inside them; it can be retracted for conventional short-range applications – this offers high flexibility. A connecting groove 405 is provided at one end of the telescopic rod 401. One end of the connecting head 402 is arranged in the connecting groove 405. The end of the telescopic rod 401 with the connecting groove 405 is provided with a slot 406 extending through the telescopic rod 401 and the connecting head 402. The adjusting screw 403 is arranged in the slot 406. The connecting head 402 and the telescopic rod 401 are rotatably connected via the adjusting screw 403, so that the telescopic rod 401 can be pivoted about the adjusting screw 403 in a vertical direction to adjust the angle between the telescopic rod 401 and the hand body 100. A nut-stop groove 407 is provided on one side of the telescopic rod 401, outside the mounting hole 406. A stop nut 408, screwed to the adjusting screw 403, is located in the nut-stop groove 407. One end of the adjusting screw 403 can be provided with a non-slip grip to facilitate turning the adjusting screw 403. At the same time, the nut-stop groove 407 prevents the stop nut 408 from turning, allowing for quick and convenient adjustment. The other end of the connecting head 402 is provided with a threaded bolt 409. The threaded bolt 409 is screwed into the screw hole 101 to create a detachable connection between the telescopic handle mechanism 400 and the hand body 100, so that the telescopic handle mechanism 400 can be easily removed for storage or replacement. An adjusting nut 404 is screwed onto the threaded bolt 409. The adjusting nut 404 rests against the end face of the hand body 100. By tightening the adjusting nut 404, the connecting head 402 can be fixed in any direction (0-360 degrees), allowing the telescopic rod 401 to be rotated around the adjusting screw 403 at any vertical angle. This provides greater flexibility in adjustment, and the angle between the telescopic rod 401 and the brush head 200 can be adapted to suit the application, further enhancing user-friendliness. The telescopic handle mechanism 400 is used as follows: When an extended handle is required, the threaded bolt 409 of the connecting head 402 is screwed into the screw hole 101 of the hand body 100, and the adjusting nut 404 is tightened to fix the direction of the connecting head 402. Then, the telescopic rod 401 is extended to the desired length, the angle of the telescopic rod 401 is adjusted, and the limiting nut 408 is tightened to fix the angle. The brush can then be used. When the extended handle is no longer needed, the adjusting nut 404 is loosened, the threaded bolt 409 is unscrewed from the screw hole 101, and the telescopic handle mechanism 400 can be removed – operation is simple and convenient. IV. Structure of the main electrical unit 300: Inside the main electrical unit 300 is a motor assembly 302. The motor assembly 302 is a small, high-speed motor that is compact, powerful, and produces low vibration and noise, thus ensuring stability and ease of use of the electric brush. The output shaft 307 of the motor assembly 302 is connected to the brush head 200 and drives it to rapid rotation to perform the cleaning or application function. The brush head 200 can be replaced depending on the application requirements, for example, with a cleaning brush head, a bristle brush head, a sponge brush head, etc., to adapt to different application scenarios – this increases its practicality. At the upper end of the main electrical part 300, a release socket 301 is provided. The release socket 301 is a semicircular socket body. The release socket 301 has the second tooth 508. The release socket 301 extends upwards into the rotary groove 108a and, together with the rotary groove 108a, encloses the release chamber 504. The release chamber 504 is longitudinally connected to the locking chamber 503 and provides space for the installation of the rotary mechanism 500, allowing the individual components of the rotary mechanism 500 to interact. The main electrical component 300 is provided with an end cap 303 on its outer section. An axle hole 304, an internal connection 305, and an external connection 306 are arranged successively on the end cap 303. The external connection 306 is provided with an annular damping toothing 308. The axle hole 304 serves as the passage for the output shaft of the motor assembly 302. The internal connection 305 is designed to be inserted into the receiving hole 204 of the protective cover 201. The external connection 306 is designed to be inserted into the receiving groove 205, whereby, upon insertion, the damping cam 206 interacts with the annular damping toothing 308 in a friction-fit damping action. This allows the angle of the protective cover 201 to be adjusted by simple rotation to adapt to the requirements of using the electric brush at different angles. V. Structure and function of the protective hood: A protective hood 201 is provided on the outside of the brush head 200. It prevents water, oil, or spice splashes ejected during operation of the brush head 200 from contaminating the surroundings and the operator's clothing, thus improving hygienic conditions during use. The protective cover 201 comprises a cover part 202 and a connecting part 203. A receiving hole 204 is formed inside the connecting part 203. A receiving groove 205 is provided outside the receiving hole 204. A damping cam 206, which exhibits a certain degree of elastic deformability, is arranged on one side of the receiving groove 205. Inside the end of the hood part 202 facing away from the connecting part 203, a sliding groove 207 is provided. A telescopic protective hood 208 is arranged at this end of the hood part 202. The telescopic protective hood 208 is provided at one end with a sliding element 209, which is inserted into the sliding groove 207 and can be moved back and forth within the sliding groove 207 to allow telescopic adjustment of the protective hood. Several rubber strips 210 are arranged evenly spaced on the top of the sliding element 209. The rubber strips 210 interact with the top wall of the sliding groove 207, so that the telescopic protective hood 208 can be positioned after movement.The rubber strips 210 in the sliding groove 207 are compressed and deform to a certain extent, thereby increasing the friction between the parts and generating sufficient friction to stably position the telescopic protective cover 208 after it has been moved and to prevent it from slipping during use. Symmetrically positioned first limiting blocks 211 are provided on both sides of the end facing away from the sliding groove 207. Symmetrically positioned second limiting blocks 212 are provided on both sides of the end of the sliding part 209 located in the sliding groove 207. The second limiting blocks 212 and the first limiting blocks 211 are arranged offset from each other to prevent the sliding part 209 from being completely pulled out of the sliding groove 207, thus preventing the telescopic protective cover 208 from falling off – this ensures operational safety. The protective hood 201 functions as follows: When the top of the brush head 200 is needed for cleaning or applying spices, the sliding part 209 of the telescopic protective hood 208 is fully inserted into the sliding groove 207. The hood part 202 then no longer covers the top of the brush head 200, exposing it so that the operator can use the top of the brush head 200 to clean corners, crevices, and other hard-to-reach areas. When the top of the brush head 200 is not needed, the telescopic protective hood 208 is extended outwards to completely cover the brush head 200. The telescopic protective hood 208 then catches any splashes of water, oil, or spices ejected from the brush head 200, keeping the surrounding area and the operator's clothing clean – this is more hygienic. The following should be noted in the description of the embodiments of this utility model: Where terms such as "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inside," "outside," or similar are used, they denote the orientation or positional relationship shown in the drawings or that is typical for the product in its ordinary use. This serves only to facilitate the description of this utility model and to simplify its presentation. It is not to be understood as an indication or suggestion that the devices or elements mentioned must have a specific orientation, be constructed in a specific orientation, or be operated in a specific orientation. Therefore, this is not to be interpreted as a limitation of this utility model. Furthermore, the terms "first", "second", "third", etc. are used solely for the purpose of differentiation in the description and are not to be understood as an indication or suggestion of relative importance. When terms like "horizontal," "vertical," "hanging," etc., are used, they do not mean that the components in question must be perfectly horizontal or vertical; they may also be slightly inclined. For example, "horizontal" simply means that the direction is more horizontal compared to "vertical"; the structure does not have to be perfectly horizontal, but may be slightly inclined. In the description of the embodiments of the present utility model, “several” means at least two. The following should also be noted in the description of the embodiments of the present utility model: Unless expressly stated otherwise or limited by the context, the terms "arranged", "mounted", "connected" (in the sense of connecting together) and "connected" (in the sense of connecting / attaching) are to be interpreted broadly. For example, they may denote a fixed connection, a detachable connection or a one-piece connection; they may denote a mechanical connection or an electrical connection; they may denote a direct connection or an indirect connection via intermediate elements; they may denote the internal connection of two components. A person skilled in the art in this field can understand the specific meaning of these terms in the present utility model from the respective context. The foregoing describes the present utility model and its embodiments. This description is not limiting. The drawings show only one embodiment of the present utility model; the actual structure is not limited to this. In short: Should a person skilled in the art be stimulated by this disclosure, without departing from the inventive concept of the present utility model and without inventive step, to develop structures or embodiments similar to this technical solution, these shall also fall within the scope of protection of the present utility model.

Claims

Handheld electric brush with adjustable angle, characterized in that it comprises: a hand body and a brush head, wherein one side of the hand body is rotatably connected to an electrical main unit, the other side of the hand body is connected via a detachable connection to a telescopic handle mechanism, and the brush head is attached to the outlet of the electrical main unit; further comprising a rotary mechanism having a release switch, a toothed locking bolt, a locking chamber, a release chamber and a return spring, wherein the release switch is arranged on the upper side of the hand body, the locking chamber is provided on the inside, the effective section of the release switch extends inwards into the locking chamber, and the release chamber is formed at an inner end of the electrical main unit.wherein the locking chamber and the unlocking chamber are connected longitudinally, wherein a pivot axis is further arranged in the unlocking chamber which extends upwards into the locking chamber, the toothed locking bolt is mounted on the pivot axis, a first tooth is provided in the locking chamber and a second tooth in the unlocking chamber, the toothed locking bolt has a switch tooth which can be brought into toothing with the first tooth or the second tooth, wherein the return spring is furthermore mounted on the pivot axis in the unlocking chamber, wherein the return spring pushes the toothed locking bolt upwards into its initial position in order to be simultaneously in toothing with the first tooth and the second tooth and thereby effect a locking between the electrical main part and the hand body, or by pressing the unlocking switch the toothed locking bolt is moved downwards,to exit the unlocking chamber and thereby cause an unlocking between the main electrical unit and the hand body. Handheld electric brush according to claim 1, characterized in that the hand body is provided with a screw hole at the end connected to the telescopic handle mechanism;The telescopic handle mechanism comprises a telescopic rod, a connecting head, an adjusting screw, and an adjusting nut, wherein one end of the telescopic rod is provided with a connecting groove, one end of the connecting head is arranged in the connecting groove, the end of the telescopic rod with the connecting groove is provided with a slot through the telescopic rod and the connecting head, the adjusting screw is arranged in the slot, the connecting head and the telescopic rod are rotatably connected via the adjusting screw, a nut limiting groove is provided on one side of the telescopic rod, outside the slot, in which a limiting nut screwed to the adjusting screw is arranged, the other end of the connecting head is provided with a threaded bolt which is screwed into the screw hole, and an adjusting nut is screwed onto the threaded bolt to fix the alignment of the connecting head. Handheld electric brush according to claim 1, characterized in that a switch groove is provided on the upper side of the hand body in which a locking hole and a pressure opening are arranged, the release switch comprises a pressure part, a locking part and a contact part, wherein the contact part enters the locking chamber through the pressure opening and rests against the upper end face of the toothed locking bolt, the locking part interacts with the locking hole to prevent the release switch from being detached. Handheld electric brush according to claim 1, characterized in that a guide tooth block is provided on the outside of the axis of rotation, and a guide tooth is formed on the inside of the toothed locking bolt, wherein the guide tooth is toothed with the guide tooth block in order to effect the longitudinal sliding guidance of the toothed locking bolt and to prevent the toothed locking bolt from rotating relative to the axis of rotation. Handheld electric brush according to claim 1, characterized in that a locking base is provided on the inside of the hand body, in which a recess forms the locking chamber, the first tooth is arranged in a circular distribution on the inner circumferential surface of the locking chamber, a rotary groove is formed at the lower end of the locking base inside the hand body, a release base is provided at the upper end of the main electrical part, which has the second tooth, the release base extends upwards into the rotary groove and together with the rotary groove encloses the release chamber. Handheld electric brush according to claim 5, characterized in that the release base is a semicircular base body, the switch tooth is an arrangement of teeth in the form of a semicircular arc on the outside of the tooth locking pin. Handheld electric brush according to claim 1, characterized in that a motor assembly is arranged within the main electrical part, and a control board, a battery and a control switch are further arranged within the hand body, wherein the motor assembly is electrically connected to the control board, the output of the motor assembly is connected to the brush head, the control switch is electrically connected to the control board, and the battery is electrically connected to the control board. Handheld electric brush according to claim 1, characterized in that a protective hood is provided on the outside of the brush head, the protective hood having a hood part and a connecting part, wherein a receiving hole is formed on the inside of the connecting part, a receiving groove is provided outside the receiving hole, a damping cam is arranged on one side of the receiving groove, the main electrical part is provided with an end cap on its outer section, on the end cap an axle hole, an inner connection and an outer connection are arranged successively, wherein the outer connection is provided with an annular damping toothing, the axle hole serves for the passage of the output shaft of the motor assembly, the inner connection serves for insertion into the receiving hole of the protective hood, the outer connection serves for insertion into the receiving groove,where, when the damping cams are inserted, they interact with the ring-shaped damping teeth in a friction-fit damping effect. Handheld electric brush according to claim 8, characterized in that a sliding groove is provided inside the end of the hood part facing away from the connecting part, a telescopic protective hood is arranged at this end of the hood part, the telescopic protective hood is provided at one end with a sliding part which is inserted into the sliding groove and is movable back and forth in the sliding groove, several rubber strips are arranged evenly distributed on the top of the sliding part which interact with the top wall of the sliding groove to enable positioning after movement of the telescopic protective hood, a first limiting block is provided symmetrically on both sides of the end facing away from the sliding groove, a second limiting block is provided symmetrically on both sides of the end of the sliding part located in the sliding groove, wherein the second limiting block and the first limiting block are arranged offset from each other,to prevent the sliding part from being completely pulled out of the sliding groove. Handheld electric brush according to one of claims 1 to 9, characterized in that the hand body comprises a hand end, a transition end and a connecting end, wherein the hand end has a handle, the connecting end serves for rotatable connection with the main electrical part, wherein the release switch is arranged at the connecting end, the transition end is arranged between the hand end and the connecting end and performs a connecting and transition function to effect a height offset between the hand end and the connecting end.

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