Cage assembly and electric tool having the same

Abstract

The present application discloses an electric tool and a holder assembly thereof, wherein the holder assembly comprises: a holder having a base, a rear holder extending backward from the base, and a front holder extending forward from the base; a driving component assembled on the rear holder; an executive component assembled on the front holder and having an output shaft extending forward, wherein the driving component and the executive component are assembled on the holder to form a holder assembly that can be modularly embedded in a cylindrical housing. The design of assembling the driving component and the executive component together to form the holder assembly before embedding reduces the structural redundancy caused by the fixing and matching functions, thereby making the whole more compact and miniaturized.

Description

Technical Field

[0001] The present application relates to an electric tool, and in particular to an electric tool having a holder. Background Art

[0002] Power tools, such as electric screwdrivers, usually include batteries, circuit boards, motors, gearboxes and other related parts. In recent years, the increasing number of functions, such as torque control and power management, has led to more complex and larger circuit board designs. In addition, the structural limitations of axial stacking of many components have brought challenges to the miniaturization of power tools. At the same time, due to the large number of scattered parts, general power tools often have two halves of the shell, which are fixed by bolts and clamped to complete the assembly. However, such a design requires pre-formed bolt holes on the shell. Due to the thickness of the holes and the need to make room for internal components, this is another reason that restricts the compactness and miniaturization of power tools.

[0003] Therefore, it is necessary to provide a compact electric tool design to overcome the technical problems existing in the prior art. Summary of the invention

[0004] The main purpose of this application is to solve the problem of compact design of electric tools.

[0005] In order to solve the above-mentioned technical problems, on the one hand, the present application provides a retaining frame assembly for an electric tool, which includes: a retaining frame having a base, a rear retaining frame extending backward from the base, and a front retaining frame extending forward from the base; the rear retaining frame is provided with a driving component; an actuator component is assembled on the front retaining frame and has an output shaft extending forward; the driving component and the actuator component are assembled on the retaining frame and together form the retaining frame assembly, and the retaining frame assembly can be inserted into a cylindrical shell along the front-to-back direction.

[0006] Furthermore, the driving component at least includes a battery, and the executing component includes a motor and a reduction gear set.

[0007] Furthermore, the driving component also includes a circuit board, and the rear retaining frame has a battery accommodating portion and a circuit board accommodating portion which are opened parallel to the output shaft.

[0008] Furthermore, the retaining frame assembly also includes at least a portion of a connecting component that electrically connects the driving component and the executing component to form a working circuit.

[0009] Furthermore, it also includes a starting switch assembled on the base and participating in the formation of the working circuit, the starting switch is a micro switch or a pressure-sensitive switch, and the end of the actuator close to the base has a switch pressing portion that cooperates with the starting switch.

[0010] Furthermore, the execution component is assembled in the front holder so as to be movable forward and backward, and the driving component is fixedly assembled in the rear holder.

[0011] On the other hand, the present application also provides an electric tool, including a cylindrical shell that is integrally injection molded and has a sleeve inner cavity and the retaining frame assembly, the sleeve inner cavity has an axial opening, and the retaining frame assembly is embedded in the shell from the axial opening.

[0012] Furthermore, the inner cavity of the shell has a stop portion, and the electric tool also includes an end cover assembled to the axial opening, and after the end cover is assembled to the shell, the retaining frame assembly is limited between the stop portion and the end cover.

[0013] Furthermore, the execution component is assembled in the front holder so as to be movable forward and backward, and the driving component is fixedly assembled in the rear holder.

[0014] Furthermore, the electric tool further comprises a presetting component for elastically presetting the execution component at an end away from the driving component.

[0015] Furthermore, the retaining frame assembly also includes a reversing switch, and an operating portion capable of driving the reversing switch is provided on the outer side wall of the cylindrical shell.

[0016] Furthermore, the outer wall of the integrally injection-molded cylindrical shell has a recess and forms a corresponding necking portion in the inner cavity, and the stopper is arranged at the necking portion.

[0017] Furthermore, the inner cavity of the sleeve is also provided with a guide component for guiding the installation of the retaining frame assembly.

[0018] According to the present application, the design of assembling the driving component and the executing component together to the retaining frame to form a retaining frame assembly before embedding reduces the structural redundancy caused by the fixing and matching functions, thereby making the whole more compact and miniaturized. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present application will be more fully understood by referring to the following detailed description of the specific implementation modes in conjunction with the accompanying drawings.

[0020] Figure 1 A schematic diagram showing the three-dimensional structure of the electric tool of the present application;

[0021] Figure 2 show Figure 1 A schematic diagram of the cross-sectional structure of the electric tool along the AA direction;

[0022] Figure 3 Show this application Power Tools in Figure 2 Schematic diagram of the exploded structure in a cutaway state;

[0023] Figure 4 show Figure 1 Schematic diagram of the exploded structure of the power tool;

[0024] Figure 5 show Figure 4 Schematic diagram of the exploded structure of the middle cage assembly and the housing before assembly;

[0025] Figure 6 show Figure 1 Schematic diagram of the exploded structure of the power tool from another angle. DETAILED DESCRIPTION

[0026] The specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In different drawings, the same or similar components are represented by the same figure marks. At the same time, it should be understood that the drawings are only used to illustrate the present application, and the sizes, proportional relationships and number of components of the components are not intended to limit the present application. In addition, it should be noted in advance that the so-called "front" and "front end" in the present application refer to the end of the power tool axially close to the object to be operated, and the "rear" and "rear end" refer to the end of the power tool axially away from the object to be processed.

[0027] See also Figures 1 to 6 As shown, and see in particular Figure 3 and Figure 4The electric tool provided in the specific embodiment of the present application is a straight-shank screwdriver, comprising a cylindrical housing 100 and a holder assembly 200 assembled in the cylindrical housing 100. The holder assembly 200 comprises a holder 2, a driving component 3 and an actuator 4. In this embodiment, the holder 2 is integrally injection molded, and has a base 21, a rear holder 22 extending backward from the base 21, and a front holder 23 extending forward from the base 21. The driving component 3 is assembled on the rear holder 22, and the actuator 4 is assembled on the front holder 23 and has an output shaft 401 extending forward and located at the front end of the straight-shank screwdriver, and the output shaft 401 roughly coincides with the geometric axis of the straight-shank screwdriver. The driving component 3 refers to a component that provides power and circuit management for the electric tool. In this embodiment, it includes a battery 31 and a circuit board 32, specifically a cylindrical battery and a long circuit board. The cylindrical battery 31 and the rectangular circuit board 32 are parallel to the output shaft 401 and overlap at least partially in the front-to-back direction. The core line of the cylindrical battery 31 does not coincide with the output shaft 401, and the output shaft 401 is not within the board surface of the circuit board 32. The core line here refers to the axis of the carbon pole of the cylindrical battery. If the battery is cylindrical, the core line basically coincides with the axis of the cylinder. The execution component 4 refers to a component that executes motion and torque output. In this embodiment, it includes a coaxially arranged motor 41 and a reduction gear set 42. The reduction gear set 42 is covered by a gear box 421 and is pressed together with the motor 41. The motor 41 is located at the rear end of the actuator 4 and has a larger outer diameter than the gear box 421. The gear box 421 has a front end face 422 and an output shaft 401 extending from the front end face 422 and located at the front end of the cylindrical shell 100. The output shaft 401 also has a bit holding portion (not marked) to adapt to a corresponding bit (not shown) to complete the operation.

[0028] The driving component 3 and the actuator 4 are assembled in the retaining frame 2 to form a retaining frame assembly 200 that can be modularly embedded in the cylindrical shell 100. The actuator 4 in the retaining frame assembly 200 can be assembled in the front retaining frame 23 so as to move forward and backward, and the driving component 3 is fixedly assembled in the rear retaining frame 22. Of course, the retaining frame assembly 200 also includes at least part of the connecting components that electrically connect the driving component 3 and the actuator 4 to form a working circuit. For example, the retaining frame assembly 200 of this embodiment at least includes the battery 31, the circuit board 32 and the motor 41, or all or part of the connecting wires, additional control switches or breakpoints that need to wait for the entire electric screwdriver to be assembled before being electrically closed, etc. In order to clearly reveal the overall structure, the connecting components are not shown in the drawings. The design of assembling the driving component 3 and the actuator 4 together to the retaining frame 2 before embedding to form the retaining frame assembly 200 realizes the modularization of the driving component 3 and the actuator 4 by using the retaining frame 2, reduces the design redundancy caused by the fixed and matching structure, and thus makes the screwdriver more compact and miniaturized as a whole.

[0029] Please continue to refer to the attached pictures and focus on Figure 2 and Figure 3 The motor 41 is at least partially assembled on the front retaining frame 23 and can move in the front-to-back direction (i.e., the direction of the output shaft 401). The rear retaining frame 22 is provided with a battery receiving portion 221 and a circuit board receiving portion 222 opened in the front-to-back direction (i.e., parallel to the direction of the output shaft 401). The battery 31 and the circuit board 32 are respectively received and retained in the battery receiving portion 221 and the circuit board receiving portion 222. In addition, the eccentric setting of the battery 31 and the motor 41 shown in this embodiment provides a larger design space for the circuit board 32. Moreover, the design of the circuit board 32 being parallel to the front-to-back direction allows additional components on the circuit board, such as the charging port 321 (in this embodiment, a Micro USB connector assembled at the rear end of the circuit board, having a plugging direction parallel to the surface of the circuit board 32 and a mounting surface attached to the circuit board 32), the electronic clutch 322 (electronically adjusting the maximum torque of the screwdriver, also having a mounting surface attached to the circuit board 32, and the specific form of the electronic clutch in this embodiment is a disc-shaped torque knob), etc., to have a large installation area and can be distributed on the outer side surface or the rear end surface of the cylindrical shell 100 with high strength.

[0030] The cylindrical shell 100 is integrally injection-molded and penetrates in the front-to-back direction, and has a sleeve inner cavity 111 and an axial opening communicating with the sleeve inner cavity 111, wherein the axial opening specifically includes a front opening 112 and a rear opening 113, and the cylindrical shell 100 also includes a front cover 12 assembled with the front opening 112 and a rear cover 13 assembled with the rear opening 113, wherein the rear cover 13 is generally arched and includes an end edge matching the rear opening 113 and a raised middle portion, and the output shaft 401 is not on the plane of the circuit board 32, and the torque knob is exposed on the transition surface between the end edge and the protrusion, so that the torque knob can be naturally exposed to the rear cover 13 by utilizing the curved transition surface. The cylindrical shell 100 is generally smaller in the front and larger in the back, and is provided with a constricted portion 114 for easy gripping at the front of the middle section. The constricted portion 114 is provided with a stopper 115 at a position corresponding to the sleeve inner cavity 111. The stopper 115 is specifically a closed stopper ring or a segmented stopper block. The rear end of the cylindrical shell 100 is square or quasi-square, and the circuit board 32 is roughly parallel to one side of the square or quasi-square, so that a circuit board layout with higher utilization rate can be obtained. The sleeve inner cavity 111 also has a guide component 14 extending in the front-to-back direction, and the outer periphery of the retaining frame 2 is provided with a guide groove 24 that cooperates with the guide component 14. The retaining frame assembly 200 is inserted into the sleeve inner cavity 111 from the axial opening (specifically the rear opening 113 in the present embodiment) and stops when the front end of the front retaining frame 23 abuts against the rear side of the stop portion 115, and the gear box 42 continues to extend forward through the stop portion 115, that is, the retaining frame assembly 200 can be inserted into the cylindrical shell 100 along the front-to-back direction.

[0031] The electric screwdriver also includes a pre-setting component 5 for elastically pre-setting the actuator 4 at one end away from the driving component 3, and the pre-setting component 5 includes a spring 51 that is inserted from the front opening 112 and sleeved on the outer periphery of the actuator 4 (specifically, the gear box 421 in this embodiment). The rear end of the spring 51 abuts against the front side of the stopper 115, and the front end abuts against a side plate 52 extending from the actuator 4. In this embodiment, the side plate 52 is annular, and the output shaft 401 passes through the side plate 52 and continues to extend forward. The side plate 52 is fixed to the gear box 42 by means of a plurality of fastening holes 424 opened on the front end face 422. The outer periphery of the actuator 4 (specifically, the outer periphery of the motor 41 in this embodiment) is provided with an anti-rotation portion 423 that cooperates with the retainer 2 or the cylindrical housing 100 to achieve circumferential limit, so as to circumferentially limit and prevent the motor stator and the actuator fixed thereto from rotating. The driving component 3 also includes a start switch 34, which is a flat pressure-sensitive switch in this embodiment. The base 21 is provided with a switch receiving portion 211 for receiving the start switch 34 on the side facing the front end. The actuator 4 is normally elastically maintained in a position where the start switch 34 is not triggered and can be driven to be triggered when subjected to external force. The flat start switch 34 is placed in the switch receiving portion 211 in a posture perpendicular to the front-back direction. The electric screwdriver also includes a switch pressing portion 43 arranged at the rear end of the actuator 4, specifically the rear end of the motor 41, and located in the pressing area of ​​the flat start switch 34. Based on the pre-elastic force provided by the spring 51, the actuator 4 is kept away from the start switch 34 (that is, away from the base 21 of the holder 2) in the non-working state. When the cylindrical housing 100 is held and an external force is applied to the object to be processed, the actuator 4 overcomes the elastic force of the spring 51, so that the switch pressing portion 43 presses the start switch 34, and the driving component 3 starts to supply power to the actuator 4, driving the bit holder to rotate. According to the change of the external force applied to the start switch 34, the driving component 3 processes and feeds back different output torques to the execution component 4 to meet the user's operating habits.

[0032] The front cover 12 is engaged with the front opening 112 of the cylindrical shell 100 after the spring 51 and the side plate 52 are installed into the sleeve cavity 111 and fixed to the actuator 4, and the bit holding part extends out of the front cover 12; the rear cover 13 is fastened to the cylindrical shell 100 by a nut (not shown) after the holder assembly 200 is installed into the sleeve cavity 111. Specifically, the nut hole 141 of this embodiment is set on the guide part 14 of the cylindrical shell 100, which can make full use of the existing structure. The holder assembly 200 also includes a reversing switch 35 integrated on the circuit board 32 and can slide along the front and rear directions. The reversing switch 35 participates in forming the working circuit, and an operating part 351 that can drive the reversing switch 35 is opened on the outer wall of the cylindrical shell 100. After the rear cover 13 is assembled to the shell 100, the holder assembly 200 is limited between the stopper 11 and the rear cover 13 and is completely accommodated in the cylindrical shell 100. Furthermore, the rear cover 13 assembled in the rear opening 113 is generally in the shape of an arch with a raised middle portion, and the rear end group of the circuit board 32 is provided with the electronic clutch 322 parallel to the board surface and exposed to the arched rear cover 13, and the electronic clutch 322 specifically provides a disc-shaped torque knob exposed to the arched rear cover 13 for dialing and adjusting. Since the output shaft 401 is not on the plane of the circuit board 32, and the torque knob is not on the middle protrusion of the arched rear cover 13, the torque knob can be exposed on the transition curved surface of the arched rear cover 13. The charging port 322 is installed at the rear end group of the circuit board 32 and has an end face parallel to the board surface of the circuit board 32 and exposed to the arched rear cover 13.

[0033] The above specific embodiments are only used to illustrate the invention content of the present application, and are not intended to limit the present application. For example, in the above specific embodiments, the reduction gear set is covered by a gear box and is pressed together with the motor. In some other embodiments, the reduction gear set may not be provided with a gear box or may be directly built into the housing of the motor; secondly, the on-off of the working circuit in the present embodiment is realized by pressing and starting the pressure-sensitive switch, while in some other embodiments, a micro switch may be selected, and even the start method may be the button start commonly used in general design; furthermore, the present embodiment is specifically an electric screwdriver, but the compact design of the present application can also be applied to other electric tools such as electric drills and electric hammers; and, the necking portion in the present embodiment is provided with a stopper at the position corresponding to the inner cavity of the sleeve, so that the necking brought by the concave structure can be used to form a stopper, and in some other embodiments, even if there is no necking portion design, the stopper can be freely provided as needed. In summary, ordinary technicians in the relevant technical field can make various changes and modifications without departing from the scope of this application. Therefore, all equivalent technical solutions also belong to the scope of this application, and the scope of patent protection of this application should be limited by the claims.

Claims

1. An electric tool, characterized in that: The invention comprises a cylindrical housing (100) which is integrally injection-molded and has a sleeve inner cavity (111), and a retainer assembly (200), wherein the sleeve inner cavity (111) has an axial opening, and the retainer assembly (200) is embedded in the housing (100) through the axial opening. The retainer assembly (200) comprises: an integrally injection-molded retainer (2), comprising a base (21), a rear retainer (22) extending rearward from the base (21), and a front retainer (23) extending forward from the base (21); the rear retainer (22) is provided with a driving component (3); an actuator component (4) comprising a motor (41), which is arranged on the front retainer (23) so as to be movable forward and backward and has an output shaft (401) extending forward, wherein the driving component (3) and the actuator component (4) are arranged on the retainer (2) and together form the retainer assembly (200), and the retainer assembly (200) can be inserted into a cylindrical housing in the forward and backward direction. The electric tool further comprises a presetting component (5) for elastically presetting the actuator (4) at one end away from the driving component (3); the presetting component (5) comprises a spring (51); in a non-working state, the pre-elastic force of the spring enables the actuator (4) to remain in a position away from and not engaged with the driving component (3); in a working state, the actuator (4) overcomes the elastic force of the spring (51) and engages with the driving component (3).

2. The electric tool according to claim 1, characterized in that: The sleeve inner cavity (111) of the housing (100) has a stop portion (115), and the electric tool further comprises a rear cover (13) assembled to the axial opening, and after the rear cover (13) is assembled to the housing (100), the retaining frame assembly (200) is limited between the stop portion (115) and the rear cover (13).

3. The electric tool according to claim 2, characterized in that: The driving component (3) is fixedly assembled on the rear retaining frame (22).

4. The electric tool according to claim 2, characterized in that: The retaining frame assembly (200) further comprises a reversing switch (35), and an operating portion (351) capable of driving the reversing switch (35) is provided on the outer side wall of the cylindrical housing (100).

5. The electric tool according to claim 2, characterized in that: The outer wall of the integrally injection-molded cylindrical shell (100) has a recess and forms a corresponding necking portion (114) in the inner cavity (111) of the sleeve, and the stopper (115) is arranged at the necking portion.

6. The electric tool according to any one of claims 2 to 5, characterized in that: The sleeve inner cavity (111) is also provided with a guide component (14) for guiding the installation of the retaining frame assembly (200).

7. The electric tool according to claim 1, characterized in that: The driving component (3) at least comprises a battery (31), and the executing component (4) comprises a reduction gear set (42).

8. The electric tool according to claim 7, characterized in that: The driving component (3) also includes a circuit board (32), and the rear retaining frame (22) has a battery receiving portion (221) and a circuit board receiving portion (222) which are opened parallel to the output shaft (401).

9. The electric tool according to any one of claims 1 to 5, characterized in that: The retaining frame assembly (200) further comprises at least a portion of a connecting component that electrically connects the driving component (3) and the executing component (4) to form a working circuit.

10. The electric tool according to claim 9, characterized in that: The retaining frame assembly (200) also includes a start switch (34) assembled on the base (21) and participating in forming the working circuit, wherein the start switch (34) is a micro switch or a pressure-sensitive switch, and the end of the actuator (4) close to the base (21) has a switch pressing portion (43) that cooperates with the start switch (34).

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