JP3087992U - Forward / reverse rotation switching mechanism for electric driver - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide a forward / reverse rotation switching mechanism of an electric screwdriver which is particularly easy to assemble and has excellent appearance. SOLUTION: A drive device 20 having a chuck 41, a power mechanism 10 having a power supply device 13, and a rotatable changeover switch 30 combined between the drive device 20 and the power mechanism 10 are provided in a middle stage of the changeover switch 30. A partition plate 31 is provided, and two conductive pieces are provided at a predetermined interval on the power mechanism 10 side of the partition plate 31, and the power supply device 13 in the power mechanism 10 is connected to the conductive piece 151 of the conductive member 15 that is a different electrode. When the electric screwdriver is electrically connected, the changeover switch 30 is twisted in the forward and reverse directions to connect the two pins 42 of the motor 40 to the arc-shaped long holes 312 and the arc-shaped long holes 312 of the partition plate 31, respectively. By moving the chuck 41 into the holes and making electrical contact with different electrodes, the rotation of the motor 40 is switched to rotate the chuck 41 forward and backward.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention particularly relates to a forward / reverse rotation switching mechanism of an electric driver having a flat surface and being easy to assemble and operate.

[0002]

[Prior art]

 As shown in FIG. 5, in the conventional electric driver, a driving device 70 composed of a member such as a motor is installed in a cover body 60, and a chuck extending from one end of the cover body 60 to one end of the driving device 70. A tool 71 such as a driver is attached to and detached from the chuck 71. Further, a power cord 73 is provided at the other end of the driving device 70. When the power cord is used, the power cord 73 is connected to an outlet and the electric driver is rotated forward and reverse to tighten or loosen the screw. A switch 74 is provided at an end of the drive device 70 on the side of the power cord 73, and a lever portion (no reference numeral) of the switch 74 protrudes from the surface of the cover body 60. The side located inside 60 is installed on a circuit board 75, and a plurality of cords (no symbols) soldered to the circuit board 75 are connected to a power cord 73 and a driving device 70, respectively. According to this configuration, the chuck 71 can be rotated forward and reverse by the switching switch 74.

[0003]

[Problems to be solved by the invention]

 However, in the structure in which the changeover switch 74 protrudes from the surface of the cover body 60 as in the conventional electric screwdriver, the entire volume is large, so that packaging becomes very troublesome, and a cord is connected to the changeover switch 74. This is very inconvenient at the time of assembly and repair, and increases the manufacturing cost.

[0004]

[Means for Solving the Problems]

 The forward / reverse rotation switching mechanism of the electric driver according to the present invention includes a power mechanism 10, a switching switch 30, and a driving device 20, and the power mechanism 10 has a hollow outer cover 11; The power supply device 13 is installed inside the base, a base 14 is provided at one end, and two corresponding conductive members 15 are provided on the upper surface of the base 14, and the two conductive members 15 have one ends thereof. Each is electrically connected to a different electrode in the outer cover 11, and the other end is installed so as to protrude from the surface of the base 14. The changeover switch 30 is assembled on the outer cover 11 of the power mechanism 10, and A partition plate 31 is provided, and two conductive pieces 34 that are in contact with the conductive members 15 in the power mechanism 10 are provided on the power mechanism 10 side of the partition plate 31, respectively, and a partition between the two conductive pieces 34 is provided. Two notches 311 facing each other are formed on the plate 31, and arc-shaped long holes 312 extending in the direction of the partition plate 31 and the conductive piece 34 are formed on both sides of the two notches 311, respectively. The drive device 20 extends slightly into the arc-shaped long hole 312 of the plate 31, is combined with the upper end of the changeover switch 30 so as to be coaxial with the power mechanism 10, is fixed to the power mechanism 10, and has a motor therein. The motor shaft of the motor 40 drives a chuck 41 protruding from the free end of the driving device 20, and further has a notch 311 of the partition plate 31 of the changeover switch 30 at a different end from the motor shaft of the motor 40. The width of the two pins 42 is narrower than the notch 311, and when the pins 42 move to the arc-shaped long hole 312, they come into contact with the conductive piece 34. The features.

[0005]

[Action]

 The present invention solves the above-mentioned problem. By combining a power mechanism, a changeover switch, and a driving device, when the electric driver is not used, the pin of the motor in the electric driver is set to the position of the changeover switch. When using an electric screwdriver, twist the selector switch to move the two pins of the motor into the arc-shaped long holes in the partition plate. Make contact with conductive strips of different electrodes. That is, the motor is rotated by being in conduction with the power supply of the power mechanism via the conductive piece. Therefore, the operation is extremely simple, there is no need to use a cord, and the number of members is reduced, so that assembly can be performed smoothly and easily.

[0006]

[Embodiment of the invention]

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side view of the forward / reverse rotation switching mechanism of the electric driver according to the present invention, FIG. 2 is an exploded perspective view of the forward / reverse rotation switching mechanism of the electric driver according to the present invention, and FIG. 3 is related to the present invention. FIG. 4 is a partial side cross-sectional view showing a connection relationship near a changeover switch in the forward / reverse rotation switching mechanism of the electric driver, and FIG. 4 is a plan sectional view of the forward / reverse rotation switching mechanism of the electric driver according to the present invention.

As shown in FIGS. 1 and 2, the forward / reverse rotation switching mechanism of the electric driver according to the present invention includes a power mechanism 10, a drive device 20, and a changeover switch combined between the power mechanism 10 and the drive device 20. A power supply device 13 is installed inside the power mechanism 10, and a motor 40 is installed inside the drive device 20. The changeover switch 30 switches between forward and reverse rotations of the motor 40. It controls the direction of rotation of the electric screwdriver.

As shown in FIGS. 1 to 3, the power mechanism 10 is provided with an external cover 11, and the bottom cover 12 is screwed to an end of the external cover 11 which is different from the changeover switch 30. A power supply device 13 installed inside the drive unit 20 controls the rotation of a motor 40 in the drive device 20, and a base 14 is provided at an end of the external cover 11 on the side of the changeover switch 30. A plurality of engaging pillars 141 are protruded upward from the free end peripheral edge at predetermined intervals, and a cylindrical convex portion 142 is provided upward at the center, and a base 14 combined with the inside of the changeover switch 30 is provided. Two concave portions 143 opposing each other are formed between the cylindrical convex portion 142 and the engaging column 141, and the two concave portions 143 respectively include a conductive piece 1 such as a copper material located at the bottom of the concave portion 143. 51, a conductive member 15 including a spring 152 located on the upper surface of the conductive piece 151 and a terminal 153 provided on the upper surface of the spring 152 is provided. One end of each of the two conductive pieces 151 extends from the bottom surface of the concave portion 143, and is connected to the positive and negative electrodes of the power supply device 13 in the outer cover 11, so that the conductive member 15 and the changeover switch 30 The drive device 20 is communicated.

Further, the driving device 20 has a hollow cover body (no reference numeral), and an engaging portion 21 is protruded downward from a lower end of the cover body. 0 and the changeover switch 30 are combined, and a motor 40 is installed inside the cover body, and a chuck 41 extending from the upper end of the cover body is driven by a motor shaft (no symbol) of the motor 40. Further, a pin 42 is provided at the lower end of the motor 40 and extends slightly from the bottom end of the engaging portion 21, and the pin 42 is combined with the changeover switch 30.

The changeover switch 30 is a ring-shaped hollow body, and its middle middle section is partitioned by a partition plate 31 to be divided into a lower end portion 32 and an upper end portion 33. Are respectively combined with the base 14 of the power mechanism 10 and the engaging portion 21 of the drive device 20, and further, a through hole 310 is formed in the center of the partition plate 31 in which the cylindrical projection 142 of the power mechanism 10 is fitted. A plurality of arc-shaped holes 35 for installing the engaging columns 141 of the power mechanism 10 are formed at predetermined intervals around the partition plate 31 on the changeover switch 30, and the engaging columns 141 are separated from the partition plate 31. It protrudes and is engaged in the engagement portion 21 of the driving device 20. Then, finally, the bolt 16 is screwed into the engaging portion 21 via the outer cover 11 of the power mechanism 10, and the power mechanism 10 and the driving device 20 are combined.

Further, two conductive pieces 34 of different electrodes are provided at predetermined intervals inside the arc-shaped holes 35 on the power mechanism 10 side of the partition plate 31 of the changeover switch 30, and these two conductive pieces are provided. Numerals 34 contact terminals 153 of the two conductive members 15 which are positive and negative electrodes extending from the power mechanism 10, respectively.

As shown in FIG. 4, the partition plate 31 located between the two conductive pieces 34 has a notch 311 having a width wider than the pin 42 of the motor 40, and conductive portions on both sides of the notch 311. At the position corresponding to the pin 42 of the motor 40 on the piece 34 and the partition plate 31, arc-shaped long holes 341 and 312 are formed, respectively, and the conductive piece 34 is exposed from the arc-shaped long hole 312. I do.

Next, the use state of the present invention will be described. When the electric screwdriver according to the present invention is not used, no electricity is transmitted because the two pins 42 of the motor 40 are located between the two notches 311 of the changeover switch 30 and do not contact the conductive piece 34. Conversely, when the electric screwdriver is used, the two pins 42 of the motor 40 are positioned in the arc-shaped elongated holes 312 of the partition plate 31 by, for example, twisting the changeover switch 30 located in the middle part, and the different electrodes are used. The motor 40 is rotated forward by contact with the conductive piece 34 of FIG. Further, when it is desired to change the rotation direction, the changeover switch 30 is twisted in the opposite direction, and the two pins 42 of the motor 40 are positioned in the other arc-shaped long hole 341 to make contact with different electrodes. This causes the motor 40 to rotate in the reverse direction.

In the present invention, at least three positioning grooves 36 are formed on the inner peripheral edge of the changeover switch 30 in order to reliably position the changeover switch 30, and two sets, that is, a total of six sets, are provided in the present embodiment. The position of the positioning groove 36 is determined by the distance between the notch 311 of the partition plate 31 and the arc-shaped long hole 312. On the other hand, the position is switched to the power mechanism 10 or the driving device 20. At least one positioning protrusion 22 is provided to be fitted in the positioning groove 36 of the switch 30. In this embodiment, the positioning protrusion 22 is provided on the driving device 20. When the electric screwdriver is used, the changeover switch 30 is twisted to position the positioning protrusion 22 in the other positioning groove 36. At the same time, the conductive plate 34 and the pins 42 of the motor 40 are brought into contact with each other to bring them into a conductive state.

[0015]

[Effect of the invention]

 Since the present invention has the above-described configuration, by assembling the power mechanism, the driving device, and the changeover switch, the assembly can be performed easily and smoothly, and the volume of the entire electric driver can be reduced, and the appearance becomes more beautiful. . Furthermore, when using an electric driver or switching the direction of rotation, the operation is very simple, since it is only necessary to twist the middle switch.

[Brief description of the drawings]

FIG. 1 is a side view of a forward / reverse rotation switching mechanism of an electric driver according to the present invention.

FIG. 2 is an exploded perspective view of a forward / reverse rotation switching mechanism of the electric driver according to the present invention.

FIG. 3 is a partial side sectional view showing a connection relation near a changeover switch in a forward / reverse rotation changeover mechanism of the electric driver according to the present invention.

FIG. 4 is a plan sectional view of the forward / reverse rotation switching mechanism of the electric driver according to the present invention.

FIG. 5 is a side sectional view of a conventional electric screwdriver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Power mechanism 11 External cover 12 Bottom cover 13 Power supply 14 Base 141 Engagement pillar 142 Cylindrical convex part 143 Depressed part 15 Conductive member 151 Conductive piece 152 Spring 153 Terminal 16 Bolt 20 Drive unit 21 Engagement part 22 Positioning convex part 30 Switch REFERENCE SIGNS LIST 31 partition plate 310 through hole 311 notch 312 arc-shaped long hole 32 lower end 33 upper end 34 conductive piece 341 arc-shaped long hole 35 arc-shaped hole 36 positioning groove 40 motor 41 chuck 42 pin 60 cover body 70 drive device 71 chuck 72 Head 73 Code 74 Changeover switch 75 Circuit board

Claims (3)

[Utility model registration claims] A power mechanism, a changeover switch,
The power mechanism 10 has a hollow outer cover 11, and a power supply device 13 is installed inside the outer cover 11,
A base 14 is provided at one end, and two corresponding conductive members 15 are provided on the upper surface of the base 14. The two conductive members 15 have one ends electrically connected to different electrodes in the outer cover 11, respectively. Is mounted so as to protrude from the surface of the base 14, and the changeover switch 30 is combined with the outer cover 11 of the power mechanism 10, and a partition plate 31 is provided in the middle section, and each of the switch plates 30 is provided on the power mechanism 10 side of the partition plate 31. Two conductive pieces 34 that are in contact with the conductive member 15 in the power mechanism 10 are provided, and two notches 311 facing each other are formed on the partition plate 31 between the two conductive pieces 34, and two notches 311 are formed. An arc-shaped long hole 312 extending in the direction of the partition plate 31 and the conductive piece 34 is formed on each side, and the conductive piece 34 slightly extends into the arc-shaped long hole 312 of the partition plate 31. The driving device 20 is combined with the upper end of the changeover switch 30 so as to be coaxial with the power mechanism 10, is fixed to the power mechanism 10, and has a motor 40 installed therein. Drives the chuck 41 projecting from the free end of the
At the end different from the motor shaft, two pins 42 penetrating the notch 311 of the partition plate 31 of the changeover switch 30 are provided, and the width of the two pins 42 is narrower than the notch 311 and moves to the arc-shaped long hole 312. A forward / reverse rotation switching mechanism for an electric screwdriver, wherein the forward / backward rotation switching mechanism is brought into contact with the conductive piece when it is turned on. 2. The power mechanism 10 has two recesses 143 formed on the surface of the base 14 and a conductive member 15 fitted in the recess 143. The conductive member 15 is
43, a conductive piece 151 penetrating through the bottom surface of the power supply device 13 and electrically connected to the power supply 13;
2 and the upper end of the spring 152,
The forward / reverse rotation switching mechanism for the electric driver according to claim 1, further comprising a terminal 153 protruding from the terminal. 3. The positioning switch has three positioning grooves formed on the inner wall of the switch at predetermined intervals, and the distance between the positioning grooves is determined by the notch of the partition plate and the arc-shaped long hole.
The positioning protrusion 22 corresponding to the positioning groove 36 is provided on the lower outer peripheral surface of the driving device 20, and a plurality of positioning protrusions 22 are provided at predetermined intervals on the surface periphery of the base 14 in the power mechanism 10. An engagement column 141 is provided, and the engagement column 141 is fixed to the engagement section 21 of the drive device 20 via a partition plate 31 of the changeover switch 30, and a bottom cover is provided at a different end of the power mechanism 10 from the changeover switch 30. The forward / reverse rotation switching mechanism for the electric screwdriver according to claim 1, wherein the second screw is screwed.