WO2018121723A1

WO2018121723A1 - Electric screwdriver

Info

Publication number: WO2018121723A1
Application number: PCT/CN2017/119760
Authority: WO
Inventors: 陈锋; 翟剑平
Original assignee: 博世电动工具（中国）有限公司
Priority date: 2016-12-30
Filing date: 2017-12-29
Publication date: 2018-07-05
Also published as: DE112017006690T5

Abstract

An electric screwdriver, comprising a front end and a rear end that are opposite to each other, and a shell (100) connecting the front end and the rear end. The front end is provided with an output shaft (401), and the rear end is far away from the output shaft (401) and may be supported by the palm of a hand. The electric screwdriver further comprises a switch (35) which is provided on the shell (100). The switch (35) is positioned at a position which may be touched by a finger when the rear end is supported by a palm. With the present electric screwdriver, once becoming accustomed to using the palm for pressing, one can conveniently use fingers to operate the switch.

Description

Electric screwdriver

Technical field

The present application relates to power tools, and more particularly to an electric screwdriver.

Background technique

Electric screwdrivers are a basic power tool commonly used. In recent years, with the increasing functions, such as torque control, power management, etc., the design of more complex and larger-sized circuit boards, combined with the structural limitations of the axial superposition of many components, has been designed for the miniaturization of power tools. Come to the challenge. At the same time, due to the large number of parts, the straight shank driver usually has two pieces of housing separated by half, and the assembly is completed by bolting the housing and clamping the parts. In addition, the industry is also struggling to find and try straight-handle screwdriver designs that are more in line with people's traditional tool handling habits and behavioral feedback.

Therefore, it is necessary to provide a straight shank driver to overcome the technical problems existing in the prior art.

Summary of the invention

The main problem to be solved by the present application is the comfort and convenience of the operation of the electric screwdriver.

In order to solve the above technical problem, the present application provides an electric screwdriver including an opposite front end and a rear end, and a housing connecting the front end and the rear end, the front end having an output shaft, the rear end being away from the output shaft And the palm can be resisted. The electric screwdriver further includes a switch disposed on the housing, and the switch is located at a position accessible by the finger when the rear end is in contact with the palm.

According to the application, when the back end is in opposition to the palm, the switch is located at a position accessible by the finger, and the switch can be conveniently operated by the finger on the basis of adapting to the palm pressing habit.

DRAWINGS

The present application will be more fully understood from the following detailed description of exemplary embodiments. among them:

1 is a schematic perspective view showing the straight shank of the present application;

Figure 2 is a cross-sectional structural view showing the straight shank driver of Figure 1 taken along the A-A direction;

3 is a schematic exploded view showing the straight shank driver of the present application in a cross-sectional view of FIG. 2;

Figure 4 is a schematic exploded view showing the straight shank driver of Figure 1;

Figure 5 is a schematic exploded view showing the cage assembly and the housing of Figure 4 before assembly;

Figure 6 is a schematic exploded view showing the other angle of the straight shank driver of Figure 1;

Figure 7 is a schematic view showing the principle of the pressing start function in the straight shank driver of the present application;

Figure 8 is a schematic view showing the palm backrest of the straight handle driver of the present application.

detailed description

The specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the different figures, the same or similar components are denoted by the same reference numerals. It should be understood that the drawings are only used to illustrate the application, and the size, the proportion of the components, and the number of components are not to be construed as limiting the present application. In addition, it should be noted in advance that the term “front” and “front end” in the present application refers to an end of the power tool axially close to the object to be operated, and “rear” and “rear end” mean that the power tool is axially away from the workpiece to be processed. One end of the object.

Referring to FIG. 1 to FIG. 7 , and referring to FIG. 3 and FIG. 4 , the electric tool provided by the specific embodiment of the present application is a straight shank screwdriver including a cylindrical casing 100 and assembled in a cylindrical casing. The cage assembly 200 within 100. The cage assembly 200 includes a cage 2, a drive member 3, and an actuator member 4. In this embodiment, the retainer 2 is integrally injection molded, and has a base portion 21, a rear retainer 22 extending rearward from the base portion 21, and a front retainer 23 extending forward from the base portion 21, the driving member 3 The output member 4 is disposed on the front holder 23 and has an output shaft 401 extending forwardly and located at the front end of the straight handle driver. The output shaft 401 is substantially parallel to the straight shank. The geometric axes of the screwdrivers coincide. The driving member 3 refers to a component that supplies power and circuit management for the power tool, and includes a battery 31 and a circuit board 32, specifically a cylindrical battery and an elongated circuit board, in the present embodiment, the cylindrical battery 31. And the rectangular circuit board 32 is parallel to the output shaft 401 and at least partially overlaps in the front-rear direction, the core of the cylindrical battery 31 does not coincide with the output shaft 401, and the output shaft 401 is not in the circuit. The plate 32 is in the plane of the board; the core line here refers to the axis of the carbon pole of the cylindrical battery, and if the battery is cylindrical, the core line substantially coincides with the axis of the cylinder; the actuator 4 refers to performing the motion The components of the torque output, in this embodiment, include a motor 41 and a reduction gear set 42 that are coaxially disposed. The reduction gear set 42 is covered by a gear box 421 and is press-fitted integrally with the motor 41. The motor 41 is located at the rearmost end of the actuator 4 and has a larger outer diameter than the gear box 421 having a front end face 422 and extending from the front end face 422 and located in the cylindrical case The output shaft 401 of the front end of the body 100 further has a bit holder (not labeled) on the output shaft 401 to fit the corresponding bit (not shown) to complete the operation.

The driving member 3 and the executing member 4 are assembled to the holder 2 to form a holder assembly 200 that can be modularly fitted in the cylindrical casing 100. The actuator member 4 in the holder assembly 200 is assembled in the front holder 23 in a front-rear movement, and the driving member 3 is fixedly assembled to the rear holder 22. Of course, the cage assembly 200 further includes at least a part of the connecting component electrically connected to the driving component 3 and the executing component 4, for example, the cage component 200 of the embodiment includes at least the battery 31 and the circuit. The board 32 and the motor 41, or all or part of the connecting line, additional control switches or breakpoints that need to wait for the entire electric screwdriver to be assembled after electrical assembly is completed, etc., for clarity of disclosure of the overall structure, The connecting parts are shown. The design that the drive member 3 and the actuator member 4 are co-assembled to the cage 2 before the insertion to form the cage assembly 200 realizes the modularization of the drive member 3 and the actuator member 4 by the cage 2, reducing the fixing and cooperation The design redundancy caused by the structure makes the overall driver compact and compact.

Referring to the drawings and with particular reference to FIGS. 2 and 3, the motor 41 is at least partially assembled to the front holder 23 and is movable in the front-rear direction (ie, the direction of the output shaft 401). The holder 22 is provided with a battery housing portion 221 and a circuit board housing portion 222 that are opened in the front-rear direction (that is, in a direction parallel to the output shaft 401). The battery 31 and the circuit board 32 are respectively received and held in the battery housing portion. 221 and the circuit board housing portion 222. In addition, the eccentric arrangement of the battery 31 and the motor 41 shown in this embodiment provides a larger design space for the circuit board 32, and the design of the circuit board 32 parallel to the front-rear direction allows for additional on the circuit board. The component is, for example, a 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 board surface of the circuit board 32 and a mounting surface attached to the circuit board 32), and an electronic clutch 322 ( The torque maximum value of the screwdriver is electronically adjusted, and the mounting surface attached to the circuit board 32 is also provided. The specific form of the electronic clutch in the embodiment is a disk-shaped torque knob, etc., and can have a large mounting area and can be high. The strength is distributed on the outer side surface or the rear end surface of the cylindrical casing 100.

The cylindrical casing 100 is integrally injection-molded and penetrates in the front-rear direction, and has a sleeve inner cavity 111 and an axial opening communicating with the sleeve inner cavity 111, the axial opening specifically including a front opening 112 and a rear opening 113, the cylindrical housing 100 further includes a front cover 12 assembled to the front opening 112 and a rear cover 13 assembled to the rear opening 113, the rear cover 13 being generally arched, including The end edge of the rear opening 113 is matched with the middle of the protrusion, the output shaft 401 is not in 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 bending can be utilized The transition surface naturally exposes the torque knob to the back cover 13. The tubular housing 100 has a small front and rear large shape, and a constricted portion 114 is provided at a position forward of the middle portion, and the constricted portion 114 is disposed corresponding to the position of the sleeve inner cavity 111. The stopping portion 115 is specifically a closed blocking ring or a segmented blocking block. The rear end of the cylindrical casing 100 has a square shape or a square shape, and the circuit board 32 is substantially parallel to one side of the square or the square shape, so that a more efficient circuit board layout can be obtained. The sleeve inner chamber 111 further has a guide member 14 extending in the front-rear direction, and the outer periphery of the holder 2 is provided with a guide groove 24 that cooperates with the guide member 14. The holder assembly 200 is loaded into the sleeve inner cavity 111 from the axial opening (specifically, the rear opening 113 in this embodiment) and when the front end of the front holder 23 abuts against the rear side of the stopping portion 115 Stopping, the gear case 42 continues to extend forward through the stop portion 115, that is, the holder assembly 200 can be inserted into the cylindrical casing 100 in the front-rear direction.

The driver further includes a preset member 5 that elastically presets the actuator member 4 away from one end of the driving member 3, the preset member 5 including the front opening 112 and being sleeved in the execution The spring 51 of the outer periphery of the component 4 (specifically, the gear case 421 in this embodiment). The rear end of the spring 51 abuts against the front side of the stopping portion 115, and the front end abuts against a side plate 52 extending from the executing member 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 side plate 422 by a plurality of fastening holes 424 formed in the front end surface 422. Gearbox 42. An outer circumference of the actuator member 4 (specifically, an outer circumference of the motor 41 in the embodiment) is provided with an anti-rotation portion 423 that cooperates with the cage 2 or the cylindrical housing 100 to achieve a circumferential limit to the motor stator and The fixed actuator performs circumferential limit and anti-rotation. The driving member 3 further includes a start switch 34. In this embodiment, a flat pressure sensitive switch is specifically disposed. The base portion 21 is recessed with a switch receiving portion 211 for placing the start switch 34. The actuator member 4 is normally held elastically in a position that does not trigger the start switch 34 and can drive the start switch 34 to be triggered when subjected to an external force. The flat start switch 34 is placed in the switch receiving portion 211 in a posture perpendicular to the front-rear direction, and the electric screwdriver further includes a rear end disposed at the execution member 4, specifically, a rear end of the motor 41. The switch pressing portion 43 is located in the pressing region of the flat start switch 34. Based on the pre-elastic force provided by the spring 51, the actuator member 4 is held away from the position of the start switch 34 (i.e., away from the base 21 of the holder 2) in the non-operating state, while the cylindrical housing 100 is held and oriented When an external force is applied to the object to be processed, the actuator member 4 overcomes the elastic force of the spring 51, so that the switch pressing portion 43 presses the start switch 34, and the driving member 3 starts supplying power to the actuator member 4 to drive the bit holder holding portion to rotate. According to the change in the magnitude of the external force by the start switch 34, the drive unit 3 processes and feeds back different output torques to the actuator 4 to conform to the user's operating habits.

The front cover 12 is engaged with the front end 112 of the cylindrical housing 100 after the spring 51 and the side plate 52 are inserted into the sleeve inner cavity 111 and fixed to the actuator member 4, and the bit holder is extended. The front cover 12 is fastened to the cylindrical casing 100 by a nut (not shown) after the retainer assembly 200 is inserted into the sleeve inner cavity 111, specifically, the embodiment The nut hole 141 is provided on the guide member 14 of the cylindrical casing 100, and the existing structure can be fully utilized. The holder assembly 200 further includes a diverter switch 35 integrated on the circuit board 32 and slidable in the front-rear direction or perpendicular to the front-rear direction, the reversing switch 35 participating in the composition In the working circuit, an operation portion (not labeled) having an operation area 351 for driving the changeover switch 35 is opened on an outer side wall of the cylindrical casing 100. After the rear cover 13 is assembled to the housing 100 , the holder assembly 200 is confined between the blocking portion 11 and the rear cover 13 and is completely received inside the cylindrical housing 100 . Moreover, the rear cover 13 assembled to the rear opening 113 is generally in the shape of a centrally convex arch, and the rear end of the circuit board 32 is provided with the electrons parallel to the board surface and exposed to the arched back cover 13. A clutch 322, the electronic clutch 322 specifically providing a disc-shaped torque knob that is exposed to the arched rear cover 13 for toggle adjustment. Since the output shaft 401 is not in the plane of the circuit board 32, the torque knob is not raised in the middle of the arched back cover 13, so that the torque knob can be exposed on the transition surface of the arched back cover 13. The charging port 322 is mounted on the rear end group of the circuit board 32 and has an end surface parallel to the board surface of the circuit board 32 and exposed to the arched back cover 13.

Please refer to FIG. 8 in combination with other drawings. The overall structure of the straight shank driver of the present application is reviewed below, and the improvement of the manipulator operation habit of the straight shank screwdriver of the present application is introduced. The straight shank driver includes a front end having an output shaft 401, a rear end remote from the output shaft 401 and being retractable by a palm, and a housing 100 connecting the front end and the rear end, the straight shank driver Also included is a switch 35 disposed on the cylindrical housing 100, the switch 35 being located at a position accessible to the finger, particularly a thumb, when the back cover 13 abuts the palm. When the back cover is in contact with the palm, the switch is located at a position accessible by the finger, and the switch can be operated efficiently and conveniently with the finger on the basis of adapting to the palm pressing habit. The switch 35 has an operation area 351 for the finger to touch, and the operation area 351 is located at a rear end surface of the housing 100 at a position of 29 mm to 64 mm. The switch 35 is located at a switch position A of the rear end of 29 mm to 64 mm. This is a range of distances that match the stroke of the finger. Sectional area of the tubular housing 100 interposed between 7.5cm ² to 11.5cm ^2, if the cross-sectional area, i.e. screwdriver too thick or too thin, it will also affect the operator's finger convenience. The rear cover 13 is generally curved in the middle and has a rounded curved transition. This design is more suitable for matching the curve of the palm position, and is not easy for the operator to feel fatigue and discomfort. The arcuate transition C of the back cover 13 is within 19 mm of the rear end, because when the curved transition C is pulled long, the back cover 13 gives a sharp feeling to the overall comfort. There will also be a negative effect. The rear portion of the cylindrical casing 100 is provided with a circuit board 32 parallel to the output shaft 401. The rear end of the circuit board 32 is provided with a charging port 322 parallel to the circuit board 32. The rear cover 13 A corresponding opening (not shown) is provided, and the charging port 322 is non-protrudingly exposed to the opening, and is provided with a soft plastic dust cover (not shown) so as not to interfere with the palm experience. The rear end of the circuit board 32 is further provided with a disk-shaped torque knob (ie, a specific form of the electronic clutch 322) parallel to the circuit board 32, and the disk-shaped torque knob is exposed to the edge in a convex or non-protruding manner. Wherein, the rear cover 13 is provided with a notch (not shown) for giving the disc-shaped torque knob. Since the disc-shaped torque knob is exposed at the edge of the edge, the proper protrusion does not have a significant influence on the palm feel, and This protrusion can be used to adjust the knob.

The straight shank driver of the present embodiment further includes a motor 41 and a reduction gear set 42 that are longitudinally movably assembled in the cylindrical casing 100, and elastically presets the motor 41 and the reduction gear set 42 away from each other. a position of the rear end and a preset member 5 for driving the motor 41 and the reduction gear set 42 to move backward when the output shaft 401 is pressed by an external force, the motor 41 and the reduction gear set 42 moving backward The working circuit that turns on the motor 41 is triggered during the process. The combination of the above-mentioned pressing method and the gripping method of the palm pressing back cover can provide a more comfortable and convenient operation experience. The switch 35 is a reversing switch that is slidable in a circumferential direction perpendicular to the output shaft 401 on the outer wall of the cylindrical casing 100. In particular, when the palm presses the gripping manner of the back cover, the thumb can flexibly perform the sliding adjustment in the circumferential direction. Of course, we can also understand that in the process of implementing the technical solutions and technical effects of the present application, the housing 100 has a cylindrical shape and the rear cover 13 separated from the housing 100 is not an essential structural feature.

In summary, the main contents of the present application are briefly summarized: an electric screwdriver including an opposite front end and a rear end, and a housing 100 connecting the front end and the rear end, the front end having an output shaft 401, the rear end Away away from the output shaft 401 and being retractable by the palm, the electric screwdriver further includes a switch 35 disposed on the housing 100, the switch 35 being located at a finger accessible when the rear end is in opposition to the palm position. The switch 35 has an operation area 351 for access by a finger, and the operation area 351 is located at a position of 29 mm to 64 mm from the rear end of the housing 100. The cross-sectional area of the housing 100 is between 7.5cm ² to 11.5cm ^2. The rear end is generally an arc-shaped transition with a central arched edge and a rounded edge. The housing 100 has a cylindrical shape, and the electric screwdriver has a rear cover 13 assembled at a rear end of the housing 100. The arcuate transition C of the back cover 13 is located within 19 mm of the rear end. The rear panel of the housing 100 is provided with a circuit board 32 parallel to the output shaft 401. The rear end of the circuit board 32 is provided with a charging port 322 parallel to the circuit board 32. The rear cover 13 is provided. Corresponding openings, the charging port 322 are non-protrudingly exposed to the opening. The rear end of the circuit board 32 is provided with a disk-shaped torque knob parallel to the circuit board 32. The disk-shaped torque knob is exposed in a convex or non-protruding manner to the edge of the edge, and the rear cover 13 is provided with The gap of the disc-shaped torque knob is located. The electric screwdriver further includes a motor 41 and a reduction gear set 42 that are longitudinally movably assembled in the housing 100, and elastically presets the motor 41 and the reduction gear set 42 away from the rear end. a preset member 5 that can move the motor 41 and the reduction gear set 42 backward when the output shaft 401 is pressed by an external force, and the motor 41 and the reduction gear set 42 trigger the guide during the backward movement. The working circuit of the motor 41 is passed. The switch 35 is a reversing switch that is slidable in the circumferential or axial direction of the output shaft 401 on the outer wall of the housing 100.

The above specific embodiments are merely illustrative of the invention and are not intended to limit the invention. For example, in the above embodiment, the reduction gear set is covered by the gear box and is press-fitted with the motor. In other embodiments, the reduction gear set may not be provided with a gear box or directly built into the housing of the motor. Secondly, the on and off of the working circuit in this embodiment is implemented by pressing and starting the pressure sensitive switch, and in other embodiments, the micro switch can also be selected, and even the starting mode can adopt the general design. In other words, the present embodiment is specifically an electric screwdriver, but the compact design of the present application can also be applied to other power tools such as electric drills, electric hammers, and the like; and, this embodiment The venting portion of the sleeve is provided with a stopper portion corresponding to the position of the sleeve inner cavity, so that the sag formed by the recessed structure can be used to form the stopper, and in other embodiments, even if there is no shrinkage portion design, It is also possible to freely set the stopper as needed. In the above, various changes and modifications can be made by those skilled in the art without departing from the scope of the present application. Therefore, all equivalent technical solutions are also within the scope of the present application. The scope should be defined by the claims.

Claims

An electric screwdriver includes an opposite front end and a rear end, and a housing (100) connecting the front end and the rear end, the front end having an output shaft (401), the rear end being away from the output shaft (401) And the palm can be resisted, characterized in that: the electric screwdriver further comprises a switch (35) disposed on the housing (100), the switch (35) is located when the rear end is in opposition to the palm The position that the finger can reach.
The electric screwdriver according to claim 1, wherein said switch (35) has an operation area (351) for finger touch, and said operation area (351) is located at a rear end of said housing (100) From 29mm to 64mm.
The electric screwdriver machine according to claim 2, wherein the cross-sectional area of the housing (100) is between 2 7.5cm to 11.5cm 2.
The electric screwdriver according to any one of claims 1 to 3, characterized in that the rear end is generally curved in a curved shape with a central portion and a rounded edge.
The electric screwdriver according to any one of claims 1 to 3, wherein the casing (100) has a cylindrical shape, and the electric screwdriver has a rear end of the casing (100). Rear cover (13).
The electric screwdriver according to claim 5, characterized in that the rear cover (13) has an arcuate transition (C) within 19 mm from the rear end.
The electric screwdriver according to claim 5, wherein a rear portion of the casing (100) is provided with a circuit board (32) parallel to the output shaft (401), the circuit board (32) The rear end group is provided with a charging port (322) parallel to the circuit board (32), and the rear cover (13) is provided with a corresponding opening, and the charging port (322) is non-protrudingly exposed to the opening.
The electric screwdriver according to claim 7, wherein said rear end of said circuit board (32) is provided with a disc-shaped torque knob parallel to the circuit board (32), said disc-shaped torque knob being convex or The non-protruding form is exposed at the edge of the rounded portion, and the back cover (13) is provided with a notch that allows the disc-shaped torque knob to be positioned.
The electric screwdriver according to any one of claims 1 to 3, wherein the electric screwdriver further includes a motor (41) that is slidably disposed in the housing (100) and decelerated a gear set (42), and elastically presetting the motor (41) and the reduction gear set (42) at a position away from the rear end and driving the motor when the output shaft (401) is pressed by an external force (41) and a preset component (5) for moving the reduction gear set (42) backward, the motor (41) and the reduction gear set (42) triggering conduction of the motor (41) during backward movement Working circuit.
The electric screwdriver according to any one of claims 1 to 3, characterized in that the switch (35) is a reversing switch, and the reversing switch can be along the outer wall of the casing (100) The shaft (401) slides in the circumferential or axial direction.