Safe electric drill with automatic stop function

Abstract

The utility model belongs to the technical field of electric drills, and particularly discloses a safety electric drill with an automatic stop function, which comprises a casing, a battery and a driving motor are arranged in the casing, and a motor switch is electrically connected between the battery and the driving motor. An output shaft of the driving motor is provided with a speed reducer. The output end of the speed reducer is in transmission connection with an elastic reset assembly. The end, away from the speed reducer, of the elastic reset assembly is in transmission connection with a one-way driving assembly which is in transmission connection with a drill clamp, and the drill clamp is detachably connected with a drill bit. According to the electric drill, the elastic reset assembly and the one-way driving assembly are arranged, drilling can be automatically stopped after the electric drill drills through a drilled object, and other parts are prevented from being damaged.

Description

Technical Field

[0001] This utility model belongs to the field of electric drill technology, specifically relating to a safety electric drill with an automatic stop function. Background Technology

[0002] An electric drill is a power tool that uses an electric motor to drive rotational movements for drilling holes or driving fasteners such as bolts and screws. It is widely used in industries such as construction, decoration, and machinery manufacturing.

[0003] In traditional electric drills, the high-speed rotating motor drives the drill chuck and drill bit to complete the rotary drilling function. Operation relies entirely on the operator's experience to determine the drilling depth. When drilling is used in assembly processes, the workpiece often encounters objects that cannot be damaged. For example, in orthopedic surgery, contact between surgical instruments and the soft tissue beneath the bones should be avoided to prevent irreversible damage. However, because drilling requires pressure from both hands, once the drilled material is penetrated, the applied force cannot be quickly withdrawn, leading to continued drilling and potentially causing collateral damage to the underlying material.

[0004] To address the problem of existing electric drills failing to stop drilling promptly after penetrating the target material, improvements to the drill's structure are necessary to resolve the current technical issues. Utility Model Content

[0005] The purpose of this invention is to provide a safety electric drill with a self-stop function. By setting up an elastic reset component and a one-way drive component, the drill can automatically stop drilling after penetrating the workpiece, thus avoiding damage to other parts.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a safety electric drill with a self-stop function, comprising a housing, wherein a battery and a drive motor are provided inside the housing, and a motor switch is electrically connected between the battery and the drive motor;

[0007] The output shaft of the drive motor is equipped with a reducer, and the output end of the reducer is connected to an elastic reset component.

[0008] The end of the elastic reset component away from the reducer is connected to a one-way drive component, which is connected to a drill chuck, and the drill chuck is detachably connected to a drill bit.

[0009] To better realize this utility model, the housing is formed by two parts connected by a tenon and mortise structure, and the housing forms a first receiving compartment and a second receiving compartment, with the first receiving compartment connected to the side wall of the second receiving compartment.

[0010] To better realize this utility model, the battery and the motor switch are both embedded in the first receiving compartment, and the motor switch is provided with a forward and reverse lever.

[0011] To better realize this utility model, a buzzer is also provided in the first receiving compartment, and the buzzer is electrically connected to the battery and the forward and reverse lever.

[0012] To better realize this utility model, the output shaft of the drive motor is connected to a reducer, and the elastic reset component is driven to the output end of the reducer.

[0013] To better realize this utility model, the drive motor, reducer and elastic reset assembly are all embedded in the second receiving compartment. The elastic reset assembly includes a fixing sleeve. One end of the fixing sleeve is riveted to the housing of the reducer and then fixedly connected by a first screw. The other end is inserted into the housing. The outer wall of the fixing sleeve has a protrusion that abuts against the inner surface of the housing.

[0014] The fixed sleeve is coaxially connected to the drive shaft, and the drive shaft and the fixed sleeve are rotatably connected by a bearing. The drive shaft is connected to the output end of the reducer.

[0015] The drive shaft has a limiting groove away from the reducer. A spring and a connecting shaft are provided in the limiting groove. One end of the connecting shaft is movably inserted into the limiting groove, and the other end is fixedly connected to the drill chuck. The two ends of the spring abut against the drive shaft and the connecting shaft, respectively.

[0016] The connecting shaft has a locking block near the spring, and the limiting groove has a slot for the locking block to engage.

[0017] To better realize this utility model, two bearings are provided and spaced apart. A bushing is provided between the two bearings. A retaining ring is embedded in the transmission shaft near the reducer, and the bearing near the reducer abuts against the retaining ring.

[0018] To better realize this utility model, the card block is a cylindrical structure with its axis perpendicular to the connecting shaft, and the card slot is a U-shaped slot structure.

[0019] To better realize this utility model, the unidirectional drive assembly includes a mounting component and two opposing annular ratchet plates. The mounting component is fixedly connected to the drive shaft. The connecting shaft has a first mounting plate near the drive shaft. The mounting component has a second mounting plate parallel to the first mounting plate. The connecting shaft movably passes through the second mounting plate. The two ratchet plates are respectively mounted on the first mounting plate and the second mounting plate by second screws.

[0020] Beneficial effects:

[0021] This invention addresses the resistance encountered during drilling. The one-way drive assembly, connected to the drive motor via an elastic reset assembly, sequentially drives the drill chuck and drill bit, causing the drill bit to rotate and begin drilling. Once the drill bit penetrates the workpiece, the resistance suddenly decreases until it disappears. Subsequently, under the action of the elastic reset assembly, the one-way drive assembly disengages from the drive motor, and the drill bit stops rotating, thus preventing further drilling and damage to undesirable areas. However, when the drive motor reverses, the drill bit is driven to rotate again by the one-way drive assembly and gradually withdraws from the hole. Attached Figure Description

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 This is a structural schematic diagram of the present invention from the perspective of the drill bit looking at the machine housing;

[0024] Figure 3 This is a cross-sectional view of the present invention (AA section).

[0025] Figure 4 This is an enlarged view of section B of the present invention (mainly showing the elastic reset component);

[0026] Figure 5 This is an enlarged view of section B of the present invention (mainly showing the unidirectional drive component);

[0027] Figure 6 This is a structural diagram of part of the unidirectional drive component and the elastic reset component of this utility model.

[0028] In the diagram: 1. Housing; 11. First receiving compartment; 12. Second receiving compartment; 2. Battery; 3. Motor switch; 31. Forward / reverse lever; 32. Buzzer; 4. Drive motor; 5. Elastic reset assembly; 51. Fixing sleeve; 511. Protrusion; 52. First screw; 53. Drive shaft; 531. Limiting groove; 5311. Slot; 54. Bearing; 55. Spring; 56. Connecting shaft; 561. Locking block; 562. First mounting plate; 57. Bushing; 58. Retaining ring; 6. One-way drive assembly; 61. Mounting part; 611. Second mounting plate; 62. Ratchet; 63. Second screw; 7. Drill chuck; 8. Drill bit; 9. Reducer. Detailed Implementation

[0029] Example

[0030] like Figures 1-6As shown, a safety electric drill with a self-stop function includes a housing 1, inside which is a battery 2 and a drive motor 4. The drive motor 4 is a 12V 36mm motor. A motor switch 3 is electrically connected between the battery 2 and the drive motor 4. The output shaft of the drive motor 4 is equipped with a reducer 9. The output end of the reducer 9 is driven by an elastic reset component 5. The end of the elastic reset component 5 away from the reducer 9 is driven by a one-way drive component 6. The one-way drive component 6 is driven by a drill chuck 7. The drill chuck 7 uses a 0.8-8mm 3-8 24UNF wrench chuck. A drill bit 8 is detachably connected to the drill chuck 7.

[0031] The working principle of this utility model can be summarized as follows:

[0032] When drilling is required, the user selects a suitable drill bit 8 and installs it on the drill chuck 7. In the state of not drilling or after drilling through the workpiece, under the action of the elastic reset component 5 and the one-way drive component 6, when the drive motor 4 rotates forward, the drill chuck 7 and drill bit 8 cannot be driven to rotate. The battery 2 provides power to the drive motor 4. The tip of the drill bit 8 is placed against the marked point to be drilled, and pressure is applied to the electric drill to keep the drill bit 8 pressed against the workpiece. Due to the action of the elastic reset component 5, the drill chuck 7 and drill bit 8 can be driven to connect, and the drill bit 8 begins to rotate and drill. When the drill bit 8 penetrates the workpiece, the resistance will suddenly drop and eventually disappear. Subsequently, under the action of the elastic reset component 5, the one-way drive component 6 disengages from the drive motor 4, and the drill bit 8 stops rotating, thus preventing the drill bit 8 from continuing to rotate and drill, damaging parts that do not need to be drilled; the drive motor 4 is reversed by controlling the motor switch 3, and due to the action of the one-way drive component 6, the drill chuck 7 and the drill bit 8 can be driven to rotate and gradually exit the drilling hole; the motor reducer 9 is a device used to reduce the output speed of the motor and increase the output torque. It reduces the rotational motion of the motor and transmits the power to the load through a gear set or pulley mechanism, thereby achieving the purpose of deceleration.

[0033] Preferably, the housing 1 is formed by two parts connected by a tenon and mortise structure, which facilitates disassembly and installation. The housing 1 has a first receiving compartment 11 and a second receiving compartment 12. The first receiving compartment 11 is connected to the side wall of the second receiving compartment 12 and is pistol-shaped, which is convenient for the user to hold.

[0034] Preferably, both the battery 2 and the motor switch 3 are embedded in the first receiving compartment 11. The motor switch 3 is equipped with a forward and reverse rotation lever 31. Most existing electric drills use direct forward and reverse rotation switches, and the drilling and retraction operations of the drill bit 8 are completed by pressing different switches. However, this operation method has a certain risk of operation error. If the wrong switch is pressed when retraction is needed, drilling will continue, which will damage the part that does not need to be drilled. However, this application has a one-way drive component 6. Even if retraction is needed, pressing the motor switch 3 will not cause the drill bit 8 to continue rotating. Only by moving the forward and reverse rotation lever 31 to adjust it to the reverse state of the drive motor 4, and then pressing the motor switch 3, will the drive motor 4 drive the drill bit 8 to rotate under the action of the one-way drive component 6, which effectively eliminates the risk of misoperation.

[0035] Preferably, a buzzer 32 is also provided in the first receiving compartment 11. The buzzer 32 is electrically connected to the battery 2 and the forward / reverse lever 31. In order to more clearly know the current rotation direction of the drive motor 4 of the electric drill, the present invention provides a buzzer 32 and electrically connects it to the forward / reverse lever 31. When the motor rotates forward, the buzzer 32 does not work. When the forward / reverse lever 31 is moved to reverse the motor, the buzzer 32 is powered on and starts working. The buzzer 32 will emit a prompt sound to indicate that it is in reverse, making the present invention safer and more reliable.

[0036] Preferably, the drive motor 4, the reducer 9, and the elastic reset assembly 5 are all embedded in the second receiving compartment 12. The elastic reset assembly 5 includes a fixing sleeve 51, one end of which is riveted to the housing of the reducer 9 and then fixedly connected by a first screw 52 (the first screw 52 is an M3×8 hexagonal flat head screw), and the other end is inserted into the housing 1. The outer wall of the fixing sleeve 51 has a protrusion 511 that abuts against the inner surface of the housing 1. The fixing sleeve 51 is coaxially connected to the drive shaft 53, and the drive shaft 53 and the fixing sleeve 51 are rotatably connected by a bearing 54. 4. The deep groove ball bearing 5461801-2Z of GB / T276-94 is adopted. The drive shaft 53 is connected to the output end of the reducer 9. The drive shaft 53 has a limiting groove 531 away from the reducer 9. The limiting groove 531 is provided with a spring 55 and a connecting shaft 56. One end of the connecting shaft 56 is movably inserted into the limiting groove 531, and the other end is fixedly connected to the drill chuck 7. The two ends of the spring 55 abut against the drive shaft 53 and the connecting shaft 56 respectively. The connecting shaft 56 has a locking block 561 close to the spring 55. The limiting groove 531 has a locking groove 5311 for the locking block 561 to be inserted. Before drilling or when penetrating the workpiece, the drill bit 8 is not under pressure. At this time, the chuck 561 is not engaged in the slot 5311, and the connecting shaft 56 is not linked with the drive shaft 53. Even if the motor rotates, it will not drive the drill bit 8 to rotate. During the drilling process, the drill bit 8 is squeezed, the connecting shaft 56 squeezes the spring 55, the chuck 561 is engaged in the slot 5311, and the connecting shaft 56 is linked with the drive shaft 53. At this time, the drill bit 8 rotates to drill. After penetrating the workpiece, the pressure disappears, the connecting rod is pushed outward by the spring 55, the chuck 561 disengages from the slot 5311, the linkage disappears, and the drill bit 8 immediately stops rotating to drill.

[0037] Preferably, two bearings 54 are provided and spaced apart. A bushing 57 is provided between the two bearings 54. A retaining ring 58 is embedded in the transmission shaft 53 near the reducer 9. The retaining ring 58 adopts the GB894.1-86 shaft elastic retaining ring 58A type 12×1. The bearing 54 near the reducer 9 abuts against the retaining ring 58. This design facilitates the installation of the bearings 54 and provides stable support for the transmission shaft 53 through the two bearings 54.

[0038] Preferably, the locking block 561 is a cylindrical structure with its axis perpendicular to the connecting shaft 56, and the locking groove 5311 is a U-shaped groove structure. The use of the curved surface structure of the locking block 561 and the locking groove 5311 makes the engagement of the two easier and smoother.

[0039] Preferably, the one-way drive assembly 6 includes a mounting member 61 and two opposing annular ratchet plates 62. The mounting member 61 is fixedly connected to the drive shaft 53. The connecting shaft 56 has a first mounting plate 562 close to the drive shaft 53. The mounting member 61 has a second mounting plate 611 parallel to the first mounting plate 562. The connecting shaft 56 movably passes through the second mounting plate 611. The two ratchet plates 62 are respectively mounted on the first mounting plate 562 and the second mounting plate 611 by second screws 63. The second screws 63 are M2×4 countersunk head screws. Due to the structural design of the ratchet plate 62, when the connecting shaft 56 and the transmission shaft 53 are not linked, and the drive motor 4 drives the transmission shaft 53 to rotate forward, the inclined back surfaces of the two ratchet teeth will contact first. At this time, the ratchet plate 62 mounted on the second mounting plate 611 will push the ratchet plate 62 mounted on the first mounting plate 562 axially, thus preventing the connecting shaft 56 from rotating. Conversely, when the drive motor 4 drives the transmission shaft 53 to rotate in reverse, the tooth surfaces of the two ratchet teeth will contact first. At this time, the ratchet plate 62 mounted on the second mounting plate 611 will push the ratchet plate 62 mounted on the first mounting plate 562 to rotate, thereby driving the connecting shaft 56 to rotate and thus disengaging the electric drill.

[0040] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A safety electric drill with an automatic stop function, characterized in that, Includes a housing (1), inside which is a battery (2) and a drive motor (4), and a motor switch (3) is electrically connected between the battery (2) and the drive motor (4); The output shaft of the drive motor (4) is equipped with a reducer (9), and the output end of the reducer (9) is connected to an elastic reset component (5). The end of the elastic reset component (5) away from the reducer (9) is connected to a one-way drive component (6), and the one-way drive component (6) is connected to a drill chuck (7), which is detachably connected to a drill bit (8).

2. The safety drill with self-stop function according to claim 1, characterized in that, The housing (1) is formed by two parts connected by a tenon and mortise structure. The housing (1) has a first receiving compartment (11) and a second receiving compartment (12). The first receiving compartment (11) is connected to the side wall of the second receiving compartment (12) and is pistol-shaped.

3. The safety drill with self-stop function according to claim 2, characterized in that, The battery (2) and the motor switch (3) are both embedded in the first receiving compartment (11), and the motor switch (3) is provided with a forward and reverse lever (31).

4. The safety drill with self-stop function according to claim 3, characterized in that, The first receiving compartment (11) is also equipped with a buzzer (32), which is electrically connected to the battery (2) and the forward / reverse lever (31).

5. The safety drill with self-stop function according to claim 2, characterized in that, The drive motor (4), reducer (9) and elastic reset assembly (5) are all embedded in the second receiving compartment (12). The elastic reset assembly (5) includes a fixing sleeve (51). One end of the fixing sleeve (51) is riveted to the outer shell of the reducer (9) and then fixedly connected by a first screw (52). The other end is inserted into the housing (1). The outer wall of the fixing sleeve (51) has a protrusion (511) that abuts against the inner surface of the housing (1). The fixed sleeve (51) is coaxially connected to the transmission shaft (53), and the transmission shaft (53) and the fixed sleeve (51) are rotatably connected by a bearing (54). The transmission shaft (53) is connected to the output end of the reducer (9). The drive shaft (53) has a limiting groove (531) away from the reducer (9). A spring (55) and a connecting shaft (56) are provided in the limiting groove (531). One end of the connecting shaft (56) is movably inserted into the limiting groove (531), and the other end is fixedly connected to the drill chuck (7). The two ends of the spring (55) abut against the drive shaft (53) and the connecting shaft (56) respectively. The connecting shaft (56) has a locking block (561) near the spring (55), and the limiting groove (531) has a locking slot (5311) for the locking block (561) to engage.

6. The safety drill with self-stop function according to claim 5, characterized in that, Two bearings (54) are provided and spaced apart. A bushing (57) is provided between the two bearings (54). A retaining ring (58) is embedded in the transmission shaft (53) near the reducer (9). The bearing (54) near the reducer (9) abuts against the retaining ring (58).

7. The safety drill with self-stop function according to claim 5, characterized in that, The card block (561) is a cylindrical structure with its axis perpendicular to the connecting shaft (56), and the card slot (5311) is a U-shaped slot structure.

8. The safety drill with self-stop function according to claim 5, characterized in that, The unidirectional drive assembly (6) includes a mounting member (61) and two opposing annular ratchet plates (62). The mounting member (61) is fixedly connected to the drive shaft (53). The connecting shaft (56) has a first mounting plate (562) near the drive shaft (53). The mounting member (61) has a second mounting plate (611) parallel to the first mounting plate (562). The connecting shaft (56) movably passes through the second mounting plate (611). The two ratchet plates (62) are respectively mounted on the first mounting plate (562) and the second mounting plate (611) by second screws (63).

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