JP5612650B2 - Cordless small electric screwdriver - Google Patents

Description

  The present invention relates to a cordless compact electric screwdriver, and more specifically, adjustable gear ratio, low power consumption, high torque, improving work efficiency, and equipped with lighting lamp, stable during night work The present invention relates to a cordless small electric driver using a rotary speed reducer that secures the above.

A typical electric screwdriver is a screwdriver equipped with a motor, and is mainly used for bolt tightening work. Electric drivers are largely divided into small electric drivers and large electric drivers used for industrial use according to RPM (Revolutions Per Minute). The small electric screwdriver belongs to the range of 500RPM to 900RPM, and the motor torque (Torque) is as weak as 2kg / cm to 7kg / cm. Electronic products such as notebook computers, mobile phones, TFT-LCDs, cameras, and video are small. It is mainly used for tightening equipment bolts and nuts.
However, the small electric screwdriver has a limited range of use due to low torque and rotation speed, and is mainly composed of Gun Type, which has a spatial limit when screwing. In addition, due to the characteristics of the electric screwdriver, it can be used only in a place with a 220V or 110V outlet, so the mobility and work efficiency are remarkably low. In addition, the cordless small electric screwdriver can be charged only at an outlet before work, and has a disadvantage that the amount of charge is small and the usage time is very short.
Korean public utility model No. 2010-001307 (2010.02.08) discloses a portable electric screwdriver capable of magnetically attaching a screw.
However, although the above portable electric screwdriver has the advantage of being able to work stably by magnetically attaching screws, there are problems with general small cordless electric screwdrivers, that is, the limit of the range of use due to low torque and rotation speed Because it consists mainly of Gun Type, there is a spatial limit when tightening work, it can be charged only at the place with an outlet before work, the amount of charge is small and the usage time is very short There are problems that cannot overcome the shortcomings.

Korea Public Utility Model No. 2010-001307

In order to solve the problems described above, the present invention realizes a fast rotation speed and torque capable of tightening bolts and nuts of medium and large-sized equipment as well as bolts and nuts of small equipment. An object of the present invention is to provide a small cordless electric screwdriver using a rotating speed reducer.
In addition, a stick type cordless compact electric screwdriver that has no spatial limitations during tightening work, can be charged even in places where there is no 200V or 100V outlet, and has excellent mobility and work efficiency. Its purpose is to provide.
In addition, it is possible to check the amount of charge of the battery provided in the electric screwdriver, and to provide a cordless small electric screwdriver that uses a rotary speed reducer that ensures the safety of workers during night work and at the same time improves the accuracy and efficiency of work. Objective.

A cordless small electric driver using a rotary speed reducer according to an embodiment of the present invention for achieving such an object has a driver case with a built-in motor, a shape that is long in both directions and one end or both ends correspond to a bolt. Driver bit that is configured and can be exchanged and has a hook for fixing, a socket that binds to one side of the driver case and binds to the driver bit, binds to the motor and transmits torque to the socket to increase torque It is equipped with a reduction gear and a USB port, and includes a battery that supplies a stable power to the motor.
In addition, it includes a multi-socket including a fastening portion that is coupled to one side surface of the driver case and exchanges and binds a plurality of driver bits, and a fixing portion that fixes the driver bits to the driver case.
In addition, the rotational speed reducer according to the embodiment of the present invention includes a first shaft in which a driver shaft and a gear shaft are coupled, a plug shaft that is plugged in and coupled to a gear shaft of the first shaft, and a first gear that has a sun gear on the back surface. The carrier, the first planetary gear that rotates in combination with the sun gear on the back of the first carrier, the second carrier with the sun gear inserted and rotated in the center of the first planetary gear, and extended to the back of the second carrier A second planetary gear coupled to the sun gear and a ring gear coupled to the second planetary gear and rotating.

As described above, the present invention achieves miniaturization, weight reduction and simplification, and at the same time, by utilizing a rotary speed reducer that increases the number of rotations and torque, not only small equipment but also medium and large equipment bolts and The nut can be tightened. Therefore, work efficiency is improved.
In addition, it is possible to shorten the work time and increase the efficiency by using a multi-socket so that the driver bits can be exchanged and bound according to the working situation, provided with a plurality of screwdriver bits having a shape corresponding to the bolt. .
In addition, it can be charged at a 200V or 100V outlet, and can be easily charged even in places where no outlet is provided. Can improve safety and accuracy.

2 is a diagram illustrating an electric screwdriver according to a conventional technique. It is a perspective view explaining the cordless small electric screwdriver using the rotation speed reducer by one Example of this invention. It is a perspective view explaining the cordless small electric screwdriver using another rotation reduction gear by one example of the present invention. It is a top view of the cordless small electric screwdriver using the rotation speed reducer by one Example of this invention. It is a disassembled perspective view of the rotation speed reducer by one Example of this invention.

Hereinafter, the present invention will be described in detail through a preferred embodiment described with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce the present invention.
FIG. 1 is a diagram illustrating a conventional electric screwdriver. As shown in the figure, the conventional electric screwdriver (100) includes a driver case (101), a driver bit (102), a drive power switch (104), and a direction change switch (105).
In one embodiment, the driver case (101) includes a motor, a speed reducer, and a driving device, and includes a driver bit (102) and a socket (103) on one side. Another aspect of the driver case (101) is formed with a power supply unit so that power for driving the electric driver (100) can be supplied from the outside.
The power supply unit does not include a separate additional supply source, and may include a stabilization device for stabilizing a 220V or 110V current transmitted from the outside.
In one embodiment, the driver bit (102) is long in the longitudinal direction, and is inserted into and fixed to the socket (103) so as to be fixed. The driver bit (102) has a shape corresponding to the shape of the bolt at both ends in the longitudinal direction. Moreover, one end can be formed corresponding to the shape of the bolt, and can be exchanged. Surface treatment can be performed at a predetermined angle along the longitudinal direction of the driver bit (102).
In one embodiment, the socket (103) has the same shape as that of the driver bit (102) which is inserted and coupled with the driver bit (102) and whose surface is surface-treated. The socket (103) is coupled to a driving unit including a motor mounted inside the driver case (101), and transmits a rotational force to the driver bit (102).
In one embodiment, the drive power switch (104) is installed at a position where a finger can reach so that the user can operate while pushing the driver case (101) with ease. The drive power switch (104) switches the electric driver (100) ON / OFF by switching the power supplied from the power supply unit.
In one embodiment, the direction change switch 105 controls a motor mounted therein so that the electric screwdriver 100 can be selectively tightened and loosened. The driving principle of the motor for changing the direction is introduced variously now.

FIG. 2 is a perspective view illustrating a cordless small electric screwdriver using a rotary speed reducer according to an embodiment of the present invention. As shown in the figure, the cordless small electric screwdriver (200) using a rotary speed reducer consists of a driver case (101) with a built-in motor (511), a shape that is long in both directions and both ends correspond to bolts, Driver bit (102) that can be replaced and formed with a fixing hook, socket (103) that binds to one side of the driver case (101) and binds to the driver bit (102), and that binds to the motor (511) and socket ( 103) includes a rotation speed reducer (500) that transmits torque to increase torque, and a battery (not shown) that includes a USB port (201) and supplies a stable power to the motor.
In addition, the present invention is coupled to one side surface of the driver case (101) and fastens the driver bit (102) to the driver case (101) by fastening and fastening the plurality of driver bits (102). A multi-socket (300) including a fixing unit (300b) is included.

In one embodiment, the driver case (101) has a rotary speed reducer (500) mounted therein, and a socket (103) that is inserted and coupled to the driver bit (102) on one side. In the present invention, the socket (103) can be separated so that various driver bits (102) can be used interchangeably. On the other side, a USB port (201) for binding with an internal battery is attached.
In addition, a drive power switch (104), a direction change switch (105), and a deceleration switch (204) are provided in a region where a finger can reach so that the user can easily operate when grasping. The driver case (101) has a driver bit (102) and an illumination lamp (202) for irradiating light to the bolts and nuts on the side surface . The illumination lamp (202) is switched by a drive power switch (104). been made ON / OFF switching by electrical signals, it can be irradiated with light by ON / OFF switching by the lighting power switch that is provided separately (203).
Therefore, the safety of workers is ensured during night work, and the accuracy and efficiency of work are improved.
The battery further includes a power lamp (205) for confirming the state of charge of the battery, and an overcharge prevention circuit (not shown) is configured so as to extend the life of the battery and simultaneously perform rapid charge. The present invention is not limited to this, and the positions of the illumination lamp (202) and the power lamp (205) are not limited to any one place. Further, the color and size of the lamp are not limited, and various illumination lamps (202) or power lamps (205) can be realized.

In one embodiment, the driver bit (102) has a predetermined length in the longitudinal direction, is inserted into the socket (103), and is fixed and maintained in the socket (103). The driver bit (102) has a shape corresponding to a shape of a bolt for tightening a nut at both ends in the longitudinal direction, that is, a screw shape.
In addition, the driver bit (102) has a lower outer surface treated with a synthetic resin to enhance contact / holding force with the socket (103) or the driver case (101). This is to prevent the driver bit (102) from being separated from the socket (103) or the driver case (101) when the driver bit (102) and the socket (103) are inserted and coupled.
If a minus (-) bolt tightening operation must be performed during the plus (+) bolt tightening operation, the existing driver bit need not be replaced separately. (102) can be separated from the socket (103) and inserted in the opposite direction to perform the work. The present invention is not limited to this, and driver bits (102) of various lengths and shapes can be used by being inserted into the socket (103).

In one embodiment, a part of the socket (103) is included in the driver case (101), and the other part is exposed to the outside and is inserted into the driver bit (102). A part of the socket (103) mounted inside the driver case (101) is coupled to the driver shaft (501a) or the insertion shaft (502) of the rotational speed reducer (500), and the motor (511) and the rotational speed reducer The torque of (500) is transmitted to the driver bit (102).
The present invention is not limited thereto, and further includes a multi-socket (300) that is coupled with variously shaped driver bits (102) to be used according to a work situation.

FIG. 3 is a perspective view for explaining a cordless small electric screwdriver using another rotary speed reducer according to an embodiment of the present invention. As shown in the drawing, the multi-socket (300) is fixed to the driver case (101) with a fastening portion (300a) coupled to the ends of the plurality of driver bits (102) and the other ends of the driver bits (102). Includes a fixing unit (300b).
In one embodiment, the fastening portion (300a) is coupled to the end of the driver bit (102) with a hinge structure, so that the driver bit (102) can be rotated. The fastening portion (300a) has an original shape, and a plurality of driver bits (102) are exchanged and bound. Further, a hooking structure is formed inside so that the driver bit (102) is fixed when the driver bit (102) and one surface of the fastening portion (300a) form a predetermined corner during the exchange bundling. Therefore, shaking or tremor during the tightening operation can be prevented.
In one embodiment, the fixing part 300b is formed with an insertion groove corresponding to the surface of the driver bit 102 and further includes an additional insertion groove narrower than the width of the insertion groove. The surface of the fixing portion (300b) is made of a material having a high coefficient of friction such as synthetic rubber or plastic, and enables the driver bit (102) to be stably fixed. In order to improve the fixing force, a part of the surface of the driver bit (102) is surface-treated with a material having the same characteristics to increase the contact / holding force and adhesive force.
In addition, the driver bit (102) coupled to the fastening portion (300a) of the multi-socket (300) includes a plurality of driver bits (102) corresponding to various bolt shapes when the bolt or nut is tightened. For the bolting operation of the shape not provided, the driver bit (102) can be separated from the multi-socket (300) and the driver bit (102) of other shapes can be mounted.
Further, the shape of the multi-socket (300) can be realized in a polygonal shape such as a hexagonal shape and an octagonal shape, and the size can be freely realized without being limited to a certain range.
FIG. 4 shows a state in which the driver bit (102) is fixed to the fixing unit (300b).

FIG. 4 is a plan view of a cordless small electric screwdriver using a rotary speed reducer according to an embodiment of the present invention. As shown in the drawing, the driver bit (102) is coupled to the fastening portion (300a) by a hinge structure so as to be rotatable.
Further, when the driver bit (102) is rotated, the screwdriver bit (102) is inserted into the insertion groove of the fixing unit (300b), and the left and right movement is prevented in the inserted state. Therefore, the inconvenience due to the movement and tremor of the driver bit (102) when the cordless small electric screwdriver (200) using the rotary speed reducer is moved is solved.
In one embodiment, the rotary speed reducer (500) is mounted inside the driver case (101), and is coupled to the socket (103) or the multi socket (300) to transmit the rotational force to the driver bit (102).

FIG. 5 is an exploded perspective view of a rotary speed reducer according to an embodiment of the present invention. As shown in the figure, the rotary speed reducer (500) is inserted into the first shaft (501) in which the driver shaft (501a) and the gear shaft (501b) are coupled, and the gear shaft (501b) of the first shaft (501). A first planetary gear (504) having an insertion shaft (502) to be coupled and having a sun gear (503) on the back surface, and a first planetary gear that is coupled to the sun gear (503) on the back surface of the first carrier (504) and rotates ( 505), a second carrier (509) provided with a rotating sun gear (503) inserted in the center of the first planetary gear (505), and a sun gear (503) provided extending to the back surface of the second carrier (509) A second planetary gear (506) coupled to the second planetary gear (506) and a ring gear (507) coupled to the second planetary gear (506) to rotate.
In addition, the first shaft (501) further includes a bearing (508) in order to prevent wear of the coupling portion between the driver shaft (501a) and the gear shaft (501b), thereby increasing the rotational force. In addition, the gear shaft (501b) includes a magnet to prevent wear when coupled with the insertion shaft (502) and to improve the transmission efficiency of the rotational force.
The rotation speed reducer (500) further includes a motor coupling member (510) in which a round plate-shaped opening is formed for coupling with the motor (511). The motor coupling member (510) has an opening in the center, and the sun gear (503) of the motor (511) and the second planetary gear (506) are coupled through the opening. A plurality of openings formed on the round plate are formed for motor (511) and bolt fastening.
The present invention is not limited to this, and various components such as planetary gears, ring gears, and sun gears are used to adjust the deceleration through a wide range of gear ratios of the rotary speed reducer (500) and thereby increase the torque efficiency. Can be provided.

In one embodiment, a battery (not shown) provides stable power to the motor (511), the illumination lamp (202), and the power lamp (205). In addition, the battery is provided with a USB port (201) so as to be connected to an external power supply source to receive power supply, and the supplied power is charged. The battery includes any one of a lithium ion polymer battery, a lithium metal polymer battery, or a sodium battery, and various rechargeable batteries can be used.
Since the battery is charged using the USB port (201), the place or time is not limited, and the internal power supply of the personal computer or the vehicle can be used. Charging with various USB adapters is also possible. In addition, a cordless compact electric screwdriver (200) that uses a rotary speed reducer can be charged with a dedicated charger prepared in advance without using a USB port, and further includes a configuration for this purpose. be able to.
In addition, the charging of the cordless small electric driver (200) using the rotary speed reducer according to an embodiment of the present invention can be applied in various ways.
The USB port (201) is fixed or inserted by various methods such as a driver case (101) and a hinge connection method or a sliding method. Therefore, the mobility and portability of the cordless small electric driver (200) using the rotary speed reducer can be improved. In addition, the battery and the USB port (201) can be protected from external factors in the workplace, and can be prevented from being damaged.

In one embodiment, the reduction switch (204) adjusts the gear ratio of the rotary speed reducer (500) by a device or object that can be bolted and nut tightened. The rotary speed reducer (500) according to the present invention achieves a strong torque of 1 N / m or more, and the reduction switch (204) can realize a torque of 1 N / m or less.
The drive power switch (104), the direction change switch (105), the illumination power switch (203), and the reduction switch (204) included in the cordless small electric screwdriver (200) using the rotary speed reducer according to the embodiment of the present invention. The shape and position are not limited to those described above, and various modifications and changes can be made.
The terms used throughout the specification of the present invention are defined in consideration of the functions in the embodiments of the present invention, and can be sufficiently modified according to the intentions, customs, etc. of the user or operator. Therefore, the definition of this term will have to be based on the content throughout this specification.
While the present invention has been described with reference to the preferred embodiments with reference to the accompanying drawings, various modifications can be made without departing from the scope of the present invention without departing from the scope of the present invention as defined by the following claims. It is clear that deformation is possible.

100: Electric screwdriver
101: Driver case
102: Driver bit
103: Socket
104: Drive power switch
105: Direction switch
200: Cordless compact electric screwdriver using a rotary speed reducer
201: USB port
202: Lighting lamp
203: Lighting power switch
204: Deceleration switch
205: Power lamp
300: Multi-socket
300a: Fastening part
300b: fixing unit
500: Rotary reducer
501: 1st shaft
501a: Driver shaft
501b: Gear shaft
502: Insertion shaft
503: Sungear
504: First carrier
505: 1st planetary gear
506: Second planetary gear
507: Ring gear
508: Bearing
509: Second career
510: Motor coupling member
511: Motor

Claims (15)

Driver case with built-in motor;
Multiple drivers that are long in both directions, one end or both ends can be exchanged with a shape corresponding to a bolt, and the exterior of one side is surface-treated with a synthetic resin, improving contact and holding power with the above driver case bit;
An illumination lamp which is provided at a position close to the driver bit and irradiates light to an end of the driver bit;
A multi-socket comprising a fastening portion coupled to one side surface of the driver case and exchangeably binding the plurality of driver bits; and a fixing portion fixing the driver bits to the driver case;
A first shaft in which a driver shaft and a gear shaft are coupled, a first carrier having a plug shaft that is plugged into the gear shaft of the first shaft and having a sun gear on the back surface, and the sun gear on the back surface of the first carrier A first planetary gear coupled to the first planetary gear, a second carrier provided with the sun gear inserted and rotated in the center of the first planetary gear, and a first gear coupled to the sun gear extended to the back surface of the second carrier. A rotary planetary gear, comprising a ring gear that rotates in combination with the second planetary gear, and is coupled with the motor to transmit a rotational force to the multi-socket to increase the torque; and
A cordless small electric driver comprising a battery having a USB port and supplying a stable power supply to the motor, comprising an overcharge prevention circuit inside the driver case, and extending the life of the battery. In the first item, the multi-socket is
A cordless compact electric screwdriver characterized in that the fastening portion has a hinge structure and the fixing portion has an insertion coupling structure. Oite in paragraph 1, the battery,
A cordless small-sized electric screwdriver connected to an external power supply source through the USB port and charging the power supplied from the external power supply source. Oite in paragraph 1, the battery,
A cordless compact electric screwdriver comprising any one of a lithium ion polymer battery, a lithium metal polymer battery, and a sodium battery. Oite in paragraph 1, the above USB port,
A cordless compact electric screwdriver that can be fixed or inserted into the driver case. Oite in paragraph 1, the illumination lamp,
A cordless small electric screwdriver characterized by investigating light when the cordless small electric screwdriver is operated. Oite in paragraph 1, the illumination lamp,
A cordless small electric screwdriver that can investigate light regardless of whether the above cordless small electric screwdriver is activated or not. Oite in paragraph 1, the cordless small electric driver,
A cordless compact electric screwdriver further including a reduction switch for adjusting a gear ratio of the rotary reduction gear on one surface of the driver case. Oite in paragraph 1, the cordless small electric driver,
A cordless compact electric screwdriver further including a power lamp for confirming a charged state of the battery on one surface of the driver case. Oite in paragraph 1, the cordless small electric driver,
A cordless compact electric screwdriver that further includes a drive power switch for switching ON / OFF the drive of the motor. Oite in paragraph 1, the cordless small electric driver,
A cordless compact electric screwdriver that further includes an illumination power switch for switching the illumination lamp ON / OFF. Oite in paragraph 1, the cordless small electric driver,
A cordless compact electric screwdriver further including a direction changing switch for switching a rotation direction of the motor. Oite in paragraph 1, the first shaft,
A cordless compact electric screwdriver further including a bearing at a coupling portion to prevent wear of the driver shaft and the gear shaft. In item 13 , the gear shaft is
A cordless small electric screwdriver further including a magnet to prevent wear due to coupling with the insertion shaft and to improve the transmission efficiency of the rotational force. Oite in paragraph 1, the rotary speed reducer,
A cordless compact electric screwdriver further including a round plate-shaped motor coupling member for coupling with the motor.

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