An electric drill

Abstract

The present invention provides an electric drill, comprising a bracket, a drill rod, a motor assembly and a switch assembly; the bracket is provided with a handle, the switch assembly is mounted on the handle; the switch assembly comprises: a first micro switch, the first micro switch is configured to start or stop the motor assembly; a switch, the switch is pivotally mounted on the handle through a pivot; and a self-locking button, the self-locking button cooperates with the switch and is configured to: when the self-locking button is in a first state, the self-locking button abuts against the switch to prevent the switch from rotating around the pivot; when the self-locking button is in a second state, the self-locking button is out of contact with the switch, and the switch can rotate around the pivot. Compared with the prior art, the electric drill of the present invention is provided with a self-locking button so that the electric drill will be started only when and only when the switch and the self-locking button are triggered at the same time, thereby improving the safety factor of the electric drill.

Description

Technical Field

[0001] The invention relates to the technical field of electric tools, and in particular to an electric drill. Background Art

[0002] Ground drills are widely used in sandy and hard landscaping projects such as planting and digging holes for seedlings, fence pile digging, fruit tree planting, and landscaping. Conventional gasoline ground drills use a two-stroke or four-stroke gasoline engine as the power source. Although the gasoline engine has the convenience of long battery life and easy energy acquisition, the vibration and noise of the gasoline engine are unbearable for users, and professional workers are more likely to get occupational diseases after long-term use. In addition, the energy utilization rate of two-stroke or four-stroke gasoline engines is low, and the combustion of fossil fuels will inevitably emit greenhouse gases, which is not environmentally friendly. In general, the use of gasoline engines is not human-machine friendly and will pollute the environment.

[0003] To this end, researchers have developed a DC drill that uses a motor to drive the drill rod to rotate for operation. The user only needs to press the switch button to start the DC drill, which does not require the user to pull it manually like a gasoline engine drill, thus reducing the difficulty of operation. However, although this type of DC drill is easy to use, it also has safety risks. For example, the user may accidentally touch the switch button and start the DC drill.

[0004] In view of the above problems, it is necessary to provide an electric drill to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide an electric drill, which is provided with a self-locking button so that the electric drill will be started only when a switch and the self-locking button are triggered at the same time, thereby improving the safety performance of the electric drill.

[0006] To achieve the above-mentioned purpose, the present invention provides an electric drill, comprising a bracket, a drill rod, a motor assembly that drives the drill rod to work and is installed on the bracket, and a switch assembly; the bracket is provided with a handle, and the switch assembly is installed on the handle; the switch assembly comprises: a first micro switch, the first micro switch is configured to start or stop the motor assembly; a switch, the switch is pivotally mounted on the handle through a pivot and cooperates with the first micro switch; and a self-locking button, the self-locking button cooperates with the switch and is configured to: when the self-locking button is in a first state, the self-locking button abuts against the switch to prevent the switch from rotating around the pivot; when the self-locking button is in a second state, the self-locking button is out of contact with the switch, and the switch can rotate around the pivot.

[0007] As a further improvement of the present invention, a supporting arm cooperating with the switch is provided on the side of the self-locking button facing the switch, and a receiving groove cooperating with the supporting arm is provided on the side of the switch facing the self-locking button; when the self-locking button is in a first state, the supporting arm and the receiving groove are misaligned, and the supporting arm supports the switch; when the self-locking button is in a second state, the supporting arm is opposite to the receiving groove, and the switch can rotate around the pivot.

[0008] As a further improvement of the present invention, a moving direction of the self-locking button from the first state to the second state is parallel or perpendicular to the axial direction of the pivot.

[0009] As a further improvement of the present invention, a through hole is provided on a side of the handle facing the motor assembly, and the self-locking button portion protrudes from the through hole to facilitate pressing by a user.

[0010] As a further improvement of the present invention, the switch assembly further includes a switch resetting elastic element, so that the switch is reset under the action of the switch resetting elastic element.

[0011] As a further improvement of the present invention, the switch assembly further includes a self-locking button resetting elastic element, so that the self-locking button is reset under the action of the self-locking button resetting elastic element.

[0012] As a further improvement of the present invention, the electric drill also includes a reversing component, which includes a second microswitch and a reversing button that cooperates with the second microswitch; the second microswitch is configured so that the motor assembly reverses when and only when the first microswitch and the second microswitch are triggered at the same time.

[0013] As a further improvement of the present invention, the handle includes a first handle and a second handle arranged opposite to the first handle; the switch assembly is arranged on the first handle, and the reversing assembly is arranged on the second handle.

[0014] As a further improvement of the present invention, the second handle is provided with a receiving groove for accommodating the reversing button; the reversing button partially protrudes out of the receiving groove, and the protruding portion is located on a side of the second handle facing the motor assembly.

[0015] As a further improvement of the present invention, the electric drill is also provided with an illumination lamp; when the first micro switch is triggered, the illumination lamp works.

[0016] The beneficial effect of the present invention is that the electric drill of the present invention is provided with a self-locking button so that the electric drill will be started only when the switch and the self-locking button are triggered at the same time, thereby improving the safety performance of the electric drill. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the electric drill of the present invention.

[0018] Figure 2 It is a schematic diagram of the coordination of the bracket, motor assembly, and transmission mechanism.

[0019] Figure 3 It is a three-dimensional exploded diagram of the transmission mechanism.

[0020] Figure 4 It is a three-dimensional exploded view of the transmission mechanism from another angle.

[0021] Figure 5 This is a three-dimensional exploded view of the first-stage gear assembly.

[0022] Figure 6 It is a three-dimensional schematic diagram of the secondary gear assembly.

[0023] Figure 7 It is a partial enlarged view of the exploded schematic diagram of the box cover and bracket.

[0024] Figure 8 It is a three-dimensional schematic diagram of the bracket.

[0025] Fig. 9 It is a three-dimensional schematic diagram of the bracket from another angle.

[0026] Fig.10 It is a schematic diagram of the coordination of the bracket, the transmission mechanism, and the shell without the top wall.

[0027] Fig.11 It is a structural diagram of the switch assembly.

[0028] Fig.12 It is a schematic diagram of the coordination of the switch and the self-locking button.

[0029] Fig.13 It is a structural schematic diagram of the reversing component. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] See also Figure 1 as well as Figure 2 As shown, the present invention discloses an electric drill 100, including a drill rod 50, a motor assembly 60, a battery pack 70 for providing power to the motor assembly 60, a transmission mechanism 10, a bracket 20, a switch assembly 30, and a reversing assembly 40 (such as Fig. 9The drill rod 50 is an operating mechanism for performing the function of the electric drill 100. The motor assembly 60 drives the drill rod 50 to rotate through the transmission mechanism 10 to work.

[0032] See also Figure 3 , Figure 4 as well as Figure 2 As shown, the transmission mechanism 10 cooperates with the drill rod 50 and the motor assembly 60 to transmit the power output by the motor assembly 60 to the drill rod 50. The transmission mechanism 10 includes a gear assembly and a gear box 15 for accommodating the gear assembly. The gear assembly includes a primary planet carrier 11, a primary gear assembly 12, a secondary planet carrier 13 and a secondary gear assembly 14. One end of the primary planet carrier 11 is provided with a plurality of primary planetary gear shafts 111 that cooperate with the primary gear assembly 12, and the other end is provided with a sun gear 112 that cooperates with the secondary gear assembly 14.

[0033] See also Figure 5As shown, the primary gear assembly 12 includes a primary gear ring 121, a primary gear set 122 located in the primary gear ring 121, and a fixing plate 123. A plane wall 1211 and a fixing hole 1212 located between adjacent plane walls 1211 are provided on the side of the side wall of the primary gear ring 121 away from the primary gear set 122. The fixing hole 1212 penetrates the side wall of the primary gear ring 121 along the axial direction of the primary gear ring 121. A slot is provided on the side of the fixing hole 1212 facing the side wall of the gear box 15 so that the fixing hole 1212 is a semicircular hole slot. A receiving groove 1213 is also provided on the end of the primary gear ring 121 away from the secondary gear assembly 14. The primary gear set 122 includes at least two sets of primary planetary gear sets 1221. The at least two sets of primary planetary gear sets 1221 are overlapped in the axial direction of the primary gear ring 121 and are pivotally mounted on the primary planetary gear shaft 111, and the outer side thereof is meshed with the primary gear ring 121, and the inner side thereof is meshed with the central gear (not shown) disposed on the output shaft of the motor assembly 60. Each set of the primary planetary gear sets 1221 includes four planetary gears, and the four planetary gears are evenly distributed on the axial periphery of the primary gear ring 121. In this embodiment, the number of the primary planetary gear sets 1221 is 2 sets, and each set of the primary planetary gear sets 1221 includes four gears, but in other embodiments, the number of the primary planetary gear sets 1221 (not less than 2) and the number of gears contained in each set of the primary planetary gear sets 1221 can be set as required. Since the primary gear set 122 is provided with at least two sets of primary planetary gear sets 1221, the load borne by the primary gear set 122 is relatively uniform, so that the primary planet carrier 11 can withstand a larger load and form a stable output. Furthermore, since the load borne by the primary gear set 122 is relatively uniform, the service life of the transmission mechanism 10 can be effectively extended. The fixing plate 123 is located at one end of the primary gear assembly 12 away from the secondary gear assembly 14, so as to limit the primary planetary gear set 1221 in the primary gear ring 121. The fixing plate 123 includes a main body 1231, an elastic abutting portion 1232 formed by bending and extending from both sides of the main body 1231, and a connecting portion 1233 connecting the main body 1231 and the elastic abutting portion 1232. The main body 1231 is annular. The connecting portion 1233 is accommodated in the accommodating groove 1213, and the side surface of the elastic abutting portion 1232 is roughly V-shaped, and its end away from the connecting portion 1233 elastically abuts against the side wall of the gear box 15, so that the fixing plate 123 is fixed.

[0034] See also Figure 3 as well as Figure 4As shown, one end of the secondary planet carrier 13 is provided with a plurality of secondary planetary gear shafts 131 that match the secondary gear assembly 14, and the other end is provided with an output shaft 132 that matches the drill rod 50. Figure 6 As shown, the secondary gear assembly 14 includes a secondary ring gear 141 and a secondary planetary gear set 142 located in the secondary ring gear 141. A plane wall 1411 and a fixing hole 1412 located between adjacent plane walls 1411 are provided on the side of the side wall of the secondary ring gear 141 away from the secondary planetary gear set 142. The fixing hole 1412 penetrates the side wall of the secondary ring gear 141 along the axial direction of the secondary ring gear 141. A slot is provided on the side of the fixing hole 1412 facing the side wall of the gear box 15 so that the fixing hole 1412 is a semicircular hole slot. The secondary planetary gear set 142 is pivotally mounted on the secondary planetary gear shaft 131, and its outer side is meshed with the secondary ring gear 141, and its inner side is meshed with the sun gear 112. In this embodiment, the secondary planetary gear set 142 has 5 gears, but in other embodiments, the number of gears of the secondary planetary gear set 142 can be set as needed, and the present invention does not impose specific restrictions on this. Please refer to Figure 3 , Figure 4 as well as Figure 7As shown, the gear box 15 is used to accommodate the primary planet carrier 11, the primary gear assembly 12, the secondary planet carrier 13 and the secondary gear assembly 14, and includes a box body 151 and a box cover 152 matched with the box body 151. The box body 151 and the box cover 152 are respectively located on both sides of the bracket 20. The gear box 15 is provided with a first anti-rotation member. The first anti-rotation member includes a first positioning member 1511 arranged at one end of the box body 151 close to the bracket 20 and a first fixing member 1521 arranged on the side of the box cover 152 facing the bracket 20. A first abutting member 1512 is arranged on the side of the side wall of the box body 151 away from the gear assembly. A positioning rib 1513 matched with the plane wall 1211 and the plane wall 1411 is also arranged on the side of the side wall of the box body 151 facing the gear assembly. Since the contact surface between the plane wall 1211, the plane wall 1411 and the positioning rib 1513 is a plane, the contact area between the box body 151 and the primary gear ring 121, the secondary gear ring 141 can be effectively increased, thereby making it easy to assemble the gear box 15, the primary gear ring 121, and the secondary gear ring 141. In this embodiment, the number of the positioning ribs 1513 is 4, and they are evenly distributed on the side walls of the box body 151. The number of the plane walls 1211 and the plane walls 1411 are both 4, and they are evenly distributed on the side walls of the primary gear ring 121 and the secondary gear ring 141. In other embodiments, the number of the positioning ribs 1513, the plane walls 1211, and the plane walls 1411 can be set as needed, and the present invention does not impose specific restrictions on this. The box body 151 is also provided with a box body mounting hole 1514 that matches the fixing holes 1212 and the fixing holes 1412. The box cover 152 is provided with a box cover mounting hole 1522. The box cover mounting hole 1522, the box body mounting hole 1514, the fixing hole 1212, and the fixing hole 1412 are matched with screws so that the box body 151, the gear assembly, and the box cover 152 are fixed together.

[0035] See also Figure 8 , Fig. 9 as well as Figure 7As shown, the bracket 20 includes a mounting portion 21, an operating portion 22 located at the periphery of the mounting portion 21, and a connecting portion 23 connecting the mounting portion 21 and the operating portion 22. The motor assembly 60 and the transmission mechanism 10 are mounted on the mounting portion 21. The mounting portion 21 is provided with a second anti-rotation member that cooperates with the first anti-rotation member to transmit the force exerted on the tooth box 15 to the bracket 20. The second anti-rotation member includes a second positioning member 211 disposed on the side of the mounting portion 21 facing the box body 151 and a second fixing member 212 disposed on the side of the mounting portion 21 facing the box cover 152. The second positioning member 211 cooperates with the first positioning member 1511, and the second fixing member 212 cooperates with the first fixing member 1521, so that the force applied to the tooth box 15 can be transmitted to the bracket 20 through the first positioning member 1511, the second positioning member 211, the first fixing member 1521, and the second fixing member 212, thereby effectively preventing the tooth box 15 and the bracket 20 from loosening, and effectively improving the user experience. In this embodiment, the first positioning member 1511 is a positioning groove, and the second positioning member 211 is a positioning protrusion, but in other embodiments, the first positioning member 1511 can also be a positioning protrusion, and the second positioning member 211 can also be a positioning groove that cooperates with the positioning protrusion. In this embodiment, the first fixing member 1521 is a protrusion extending downward from the box cover 152, and the second fixing member 212 is a groove that cooperates with the protrusion. The box cover mounting hole 1522 is located on the first fixing member 1521. Please refer to Fig.10 as well as Figure 1As shown, the electric drill 100 also includes a housing 80 fixedly mounted on the bracket 20, and the motor assembly 60 and the transmission mechanism 10 are accommodated in the housing 80. The inner wall of the housing 80 is provided with a second abutment 81 that matches the first abutment 1512. In this way, the force applied to the tooth box 15 can be transmitted to the housing 80 through the first abutment 1512 and the second abutment 81, and then indirectly transmitted to the bracket 20, thereby effectively preventing the tooth box 15 and the bracket 20 from loosening, and effectively improving the user's experience. In this embodiment, the first abutment 1512 is a protrusion, and the second abutment 81 is a groove that matches the protrusion, but in other embodiments, the first abutment 1512 can also be a groove, and the second abutment 81 can also be a protrusion. The operating portion 22 is roughly rectangular, and a lighting lamp 221 is provided on the side facing the drill rod 50. In this embodiment, the number of the illuminating lamps 221 is 2 and they are located at one end of the operating portion 22 close to the battery pack 70. Preferably, the number of the illuminating lamps 221 is 4 and they are respectively arranged at the four corners of the operating portion 22. Such an arrangement can not only obtain a wider illumination area, but also ensure that the illumination light is emitted in the direction of the working area and will not be blocked by the drill rod 50, thereby effectively improving the user experience. The operating portion 22 is also provided with a pair of handles, and the pair of handles includes a first handle 222 and a second handle 223 arranged opposite to the first handle 222.

[0036] See also Fig.11 , Fig.12 as well as Figure 1 As shown, the switch assembly 30 is mounted on the first handle 222, and includes a first micro switch 31, a switch 32, a switch reset elastic element 33, a self-locking button 34, and a self-locking button reset elastic element 35. The first micro switch 31 is configured to start or stop the motor assembly 60. The switch 32 is pivotally mounted on the handle 222 via a pivot 321, and an abutting block 322 matching the first micro switch 31 is provided at one end of the switch 32 facing the pivot 321. A receiving groove 323 is provided on the side of the switch 32 facing the self-locking button 34. One end of the switch reset elastic element 33 abuts the first handle 222, and the other end abuts the switch 32. The self-locking button 34 includes a base 341 and an abutting arm 342 located on the side of the base 341 facing the switch 32, and the abutting arm 342 matches the receiving groove 323. One end of the self-locking button reset elastic element 35 abuts against the self-locking button 34, and the other end abuts against the first handle 222. Figure 8As shown, a through hole 2221 is further provided on a side of the first handle 222 facing the motor assembly 60 , and a portion of the self-locking button 34 protrudes out of the through hole 2221 for the user to press.

[0037] The button 34 is configured such that: when the self-locking button 34 is in a first state, the self-locking button 34 abuts against the switch 32 to prevent the switch 32 from rotating around the pivot 321; when the self-locking button 34 is in a second state, the self-locking button 34 is out of contact with the switch 32, and the switch 32 can rotate around the pivot 321. Specifically, when the self-locking button 34 is pressed (i.e., in the second state), the self-locking button reset elastic element 35 is elastically deformed, and the self-locking button 34 moves into the first handle 222 so that the abutting arm 342 faces the receiving groove 323. At this time, the switch 32 is pressed to rotate around the pivot 321, the switch reset elastic element 33 is elastically deformed, the abutting arm 342 enters the receiving groove 323, and the abutting block 322 abuts against the first micro switch 31, so that the first micro switch 31 is triggered. When the switch 32 is released, the switch 32 is reset under the action of the switch reset elastic element 33; when the self-locking button 34 is released, the self-locking button 34 is reset under the action of the self-locking button reset elastic element 35 (i.e., the first state), at which time the abutting arm 342 is misaligned with the receiving groove 323, and the abutting arm 342 abuts the switch 32 so that the switch 32 cannot rotate around the pivot 321. Due to the provision of the self-locking button 34, the electric drill 100 of the present invention will not work due to the accidental touch of the switch 32, thereby improving the safety factor of the electric drill 100. In this embodiment, the moving direction of the self-locking button 34 from the first state to the second state is parallel to the axial direction of the pivot 321, but in other embodiments, the moving direction of the self-locking button 34 from the first state to the second state can also be set to be perpendicular to the axial direction of the pivot 321.

[0038] See also Fig.13 as well as Fig. 9As shown, the reversing assembly 40 is arranged on the second handle 223, and includes a second micro switch 41, a reversing button 42 matched with the second micro switch 41, and a reversing button reset elastic element 43. The second handle 223 is provided with a receiving groove 2231 for accommodating the reversing button 42. The reversing button 42 partially protrudes out of the receiving groove 2231, and the protruding part is located on the side of the second handle 223 facing the motor assembly 60. When the reversing button 42 is pressed, the reversing button 42 retracts into the receiving groove 2231, the reversing button reset elastic element 43 undergoes elastic deformation, and the reversing button 42 abuts against the second micro switch 41, so that the second micro switch 41 is triggered. When the reversing button 42 is released, the reversing button 42 is reset under the action of the reversing button reset elastic element 43. In this embodiment, the second micro switch 41 is configured such that the motor assembly 60 is reversed when and only when the first micro switch 31 and the second micro switch 41 are triggered at the same time. This configuration can prevent the electric drill 100 from reversing due to an accidental touch of the reversing button 42, thereby effectively improving the safety factor. In this embodiment, when any one of the first micro switch 31 and the second micro switch 41 is triggered, the lighting lamp 221 will be turned on.

[0039] Compared with the prior art, the electric drill 100 of the present invention is provided with a self-locking button 34 so that the electric drill 100 is started only when the switch 32 and the self-locking button 34 are triggered at the same time, thereby improving the safety factor of the electric drill 100.

[0040] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. An electric drill, comprising a bracket, a drill rod, a motor assembly mounted on the bracket to drive the drill rod, a battery pack to provide power to the motor assembly, and a switch assembly; the bracket is provided with a handle, and the switch assembly is mounted on the handle; characterized in that: The switch assembly comprises: a first micro switch, wherein the first micro switch is configured to start or stop the motor assembly; a switch, the switch being pivotally mounted on the handle via a pivot and cooperating with the first micro switch; and a self-locking button, the self-locking button cooperates with the switch and is configured such that: when the self-locking button is in a first state, the self-locking button abuts against the switch to prevent the switch from rotating around the pivot; when the self-locking button is in a second state, the self-locking button is out of contact with the switch, and the switch can rotate around the pivot; The electric drill also includes a reversing component, which includes a second micro switch and a reversing button that cooperates with the second micro switch; the second micro switch is configured so that the motor assembly reverses when and only when the first micro switch and the second micro switch are triggered at the same time.

2. The electric drill according to claim 1, characterized in that: A supporting arm cooperating with the switch is arranged on the side of the self-locking button facing the switch, and a receiving groove cooperating with the supporting arm is arranged on the side of the switch facing the self-locking button; when the self-locking button is in a first state, the supporting arm and the receiving groove are misaligned, and the supporting arm supports the switch at this time; when the self-locking button is in a second state, the supporting arm is opposite to the receiving groove, and the switch can rotate around the pivot.

3. The electric drill according to claim 1, characterized in that: The moving direction of the self-locking button from the first state to the second state is parallel or perpendicular to the axial direction of the pivot.

4. The electric drill according to claim 3, characterized in that: A through hole is provided on one side of the handle facing the motor assembly, and the self-locking button portion protrudes from the through hole for the user to press.

5. The electric drill according to claim 1, characterized in that: The switch assembly further comprises a switch resetting elastic element, so that the switch is reset under the action of the switch resetting elastic element.

6. The electric drill according to claim 1, characterized in that: The switch assembly further comprises a self-locking button resetting elastic element, so that the self-locking button is reset under the action of the self-locking button resetting elastic element.

7. The electric drill according to claim 1, characterized in that: The handle comprises a first handle and a second handle arranged opposite to the first handle; the switch assembly is arranged on the first handle, and the reversing assembly is arranged on the second handle.

8. The electric drill according to claim 7, characterized in that: The second handle is provided with a receiving groove for receiving the reversing button; the reversing button partially protrudes out of the receiving groove, and the protruding portion is located on a side of the second handle facing the motor assembly.

9. The electric drill according to any one of claims 1 to 8, characterized in that: The electric drill is also provided with an illumination lamp; when the first micro switch is triggered, the illumination lamp works.

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