KR101631236B1 - Grinder having auto intercepting part for power - Google Patents

Grinder having auto intercepting part for power Download PDF

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Publication number
KR101631236B1
KR101631236B1 KR1020150045776A KR20150045776A KR101631236B1 KR 101631236 B1 KR101631236 B1 KR 101631236B1 KR 1020150045776 A KR1020150045776 A KR 1020150045776A KR 20150045776 A KR20150045776 A KR 20150045776A KR 101631236 B1 KR101631236 B1 KR 101631236B1
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KR
South Korea
Prior art keywords
grinder
paddle
electronic switch
paddle member
automatic power
Prior art date
Application number
KR1020150045776A
Other languages
Korean (ko)
Inventor
박재현
Original Assignee
계양전기 주식회사
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Publication date
Application filed by 계양전기 주식회사 filed Critical 계양전기 주식회사
Priority to KR1020150045776A priority Critical patent/KR101631236B1/en
Application granted granted Critical
Publication of KR101631236B1 publication Critical patent/KR101631236B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

According to the present invention, a grinder having an automatic power shutoff unit comprises: a body which accommodates a drive motor and has a rotary shaft which rotates by operation of the drive motor; a grinder fixed and mounted on an end of the rotary shaft arranged on the outside of the body to rotate by rotational drive of the rotary shaft to perform grinding work; an electronic switch disposed on one side in the body to selectively supply power to a side of the drive motor; and an automatic power shutoff unit which comes in contact with one side of the electronic switch and selectively operates the electronic switch depending on whether the body is gripped by both hands of a worker to control supply of power to determine whether to rotate the grinder. When the worker loses the grinder by mistake while performing work using the grinder, the power supplied to the grinder is shut off to guarantee safety of the worker and prevent an error of work where grinding work is performed on an undesired area.

Description

TECHNICAL FIELD [0001] The present invention relates to a grinder having an automatic power-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power tool, and more particularly, to a grinder provided with an automatic power cutoff unit.

Generally, a hand grinder is a tool used for cutting or cutting a metal workpiece directly on the spot while being carried by an operator, and is a machine for machining a workpiece using a donut-shaped disk-shaped grinding wheel. Cutting a metal according to a tool, machining a metal surface, or removing a corroded surface of a metal.

Meanwhile, in the hand grinder as described above, the safety cover for covering the grinding wheel is mounted. In the safety cover, when the metal workpiece is machined, flames or dust are generated due to friction between the grinding wheel and the workpiece, This is to prevent the risk of injury or workplace harm and to generate a certain gripping force in the hands of the operator gripping the grinder during the work, and to prevent injuries caused by the grinding wheel when the operator is careless.

FIG. 1 is a safety cover of a conventional hand grinder. Referring to FIG.

As shown in FIG. 1, the hand grinder includes a body 40 with a built-in driving motor, and a rotary shaft 60 that receives power from the driving motor and rotates the grinding wheel at one end of the body 40 The body 40 is formed with a head portion 50 protruding from a boundary with the rotary shaft portion 60.

The safety cover includes a front surface protection plate 20 protruding from the outer surface of the side surface protection plate 10 having a predetermined angle and is provided on the rotation axis portion 60 of the grinder at the center of the side surface protection plate 10, And is attached to the rotary shaft portion 60 of the grinder by the binding portion 30. The side surface protection plate 10 and the front surface protection plate 20 are provided on the side surface portion It is possible to prevent the worker from being injured due to the flame generated in the front part and also to prevent the workplace harm caused by the dispersion of the dust and in particular to prevent the worker's hands from approaching with the grinding wheel due to carelessness, It is possible to prevent.

However, in the conventional hand grinder as described above, even if the operator accidentally misses the hand grinder during the grinder work, the grinder continuously operates, so that the worker may be injured. In addition, by the continuous operation of the grinder, There is a problem in that a grinder operation is performed until the grinder is reworked.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a grinder, which, when an operator accidentally misses a grinder during operation using the grinder, cuts off power supplied to the grinder, And an automatic power cut-off portion that can prevent an error in the received work from occurring.

In order to solve the above-described problems, the present invention provides a motorcycle comprising: a body accommodating a driving motor and provided with a rotating shaft that is rotationally driven by an operation of the driving motor; A grinder fixedly coupled to an end of the rotary shaft disposed outside the body and rotating according to rotation of the rotary shaft to perform a grinding operation; An electronic switch provided on one side of the body to selectively supply power to the driving motor; An automatic power cut-off part for contacting the one side of the electronic switch and selectively operating the electronic switch according to whether the operator's hands grips the body or not, thereby controlling power supply to determine whether the grinder rotates; A grinder having an automatic power cut-off portion.

The automatic power shutoff unit includes a bar shaped seesection member provided inside the body and in contact with an end of the electronic switch, and a seesaw member that presses the electronic switch to supply power to the drive motor, And a paddle portion hinged to an end of the swinging member and being pivotally connected to a lower surface of the seesick member to be inserted into the body as the operator grasps the body.

The electronic switch may be provided with a separate elastic spring capable of elastically supporting the seesection member in a direction opposite to a direction in which the electronic switch is pressed by the seesaw member.

The paddle unit may include a first paddle member having one end hinged to the body and the other end hinged to one end of the seesaw member and a second paddle member having one end hinged to the body and the other end contacting the other end of the seesaw member. 2 paddle member.

The first paddle member and the second paddle member may be provided at one side thereof with a safety switch for restricting the movement of the first paddle member and the second paddle member into the inside of the body.

The first paddle member and the second paddle member may be disposed at a position where an operator grasps the body with a right hand finger and a left hand finger when the operator grips the body.

The present invention prevents the power supplied to the grinder from being cut off when the operator accidentally misses the grinder during the work using the grinder, thereby assuring the safety of the worker and preventing an error in the operation in which the grinder work is accommodated in the undesired area There is an effect that can be.

1 is a perspective view showing a structure of a conventional grinder,
2 is a plan view showing a structure of a grinder having an automatic power cutoff unit according to an embodiment of the present invention,
FIG. 3 is an operation diagram sequentially showing the operation of the first paddle member of the grinder having the automatic power cutoff unit of FIG. 2,
FIG. 4 is an operation diagram sequentially showing the operation of the second paddle member of the grinder having the automatic power cutoff unit of FIG. 2,
FIG. 5 is an operation diagram sequentially showing operations of the first paddle member and the second paddle member of the grinder having the automatic power cutoff unit of FIG. 2;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a plan view showing a structure of a grinder having an automatic power cut-off unit according to an embodiment of the present invention. FIG. 3 is a view showing the operation of the first paddle member of the grinder having the automatic power cut- FIG. 4 is an operation diagram sequentially showing the operation of the second paddle member of the grinder having the automatic power cut-off unit of FIG. 2, and FIG. 5 is a view showing the operation of the first paddle member of the grinder having the automatic power cut- Fig. 3 is an operation diagram sequentially showing operations of the paddle member and the second paddle member.

As shown in these drawings, a grinder having an automatic power cutoff unit according to an embodiment of the present invention includes a rotation shaft 120 that accommodates a drive motor 110 and is rotationally driven by the operation of the drive motor 110, A body 100 provided with the body 100; A grinder 200 fixedly coupled to an end of the rotary shaft 120 disposed outside the body 100 and rotating according to rotation of the rotary shaft 120 to perform a grinding operation; An electronic switch 300 provided at one side of the body to selectively supply power to the driving motor 110; The electronic switch 300 is selectively operated according to whether the operator's hands are gripped with respect to the body 100 in contact with one side of the electronic switch 300 to control power supply to determine whether the grinder 200 is rotated And an automatic power cut-off unit 400 for determining the automatic power cutoff unit 400.

The body 100 is provided with an internal space for accommodating various components such as the driving motor 110. The body 100 is provided with a rotary shaft 120 rotatably driven by the driving motor 110 Lt; / RTI >

The grinder 200 is fixedly coupled to an end portion of the rotating shaft 120 exposed to the outside of the body 100 and is driven to rotate by the rotation of the rotating shaft 120 driven by the driving motor 110, .

The electronic switch 300 is provided inside one side of the body 100 so as to selectively cut off power supplied to the driving motor 110. The electronic switch 300 is provided with elasticity A spring (not shown) is incorporated.

The automatic power shutoff unit 400 includes a bar shaped seating member 410 disposed inside the body 100 and in contact with an end of the electronic switch 300, An end portion of the body 100 is hinged to one side of the body 100 so as to be supplied with power to the driving motor 110 side and is contacted with the lower surface of the seesection member 410 to grip the body 100, And a paddle portion 420 which is arranged to be pulled inward.

The seesaw member 410 is a plate-shaped member having a predetermined length, one side of which is hinged to one end of a first paddle member 421 to be described later, and a lower surface thereof is disposed above the second paddle member 422 And the central region of the upper surface thereof is disposed inside the body 100 in contact with the end of the electronic switch 300.

The seesaw member 410 is elastically supported in a direction opposite to the direction in which the electronic switch 300 is pressed by the paddle portion 420 by being in contact with the end portion of the electronic switch 300 having the elastic spring incorporated therein.

The paddle unit 420 is configured to selectively supply power to the driving motor 110 by inserting the sows member 410 disposed in contact with the electronic switch 300 into the inside of the body 100 It plays a role.

The paddle unit 420 includes a first paddle member 421 having one end hinged to the body 100 and the other end hinged to one end of the seesection member 410 and a second paddle member 421 having one end hinged to the body 100 And the second paddle member 422 whose other end is in contact with the other end of the seesaw member 410.

The first paddle member 421 and the second paddle member 422 are disposed at positions where the operator's right and left fingers grip the body 100 when the operator grips the body 100, The state in which the seesite member 410 is pressed toward the electronic switch 300 by the first paddle member 421 and the second paddle member 422 is canceled so that the power supplied to the drive motor 110 side And the rotation of the grinder 200 is stopped.

One end of the first paddle member 421 is hinged to one side of the body 100 and the other end of the first paddle member 421 is hinged to one end of the seesection member 410 to form a first paddle member 421 Is pulled into the inside of the body 100, one end of the seesection member 410 moves upward and presses the electronic switch 300 to supply power to the driving motor 110 side.

The second paddle member 422 is a member having a vertical triangular profile and one end of which is hinged to the other side of the body 100 and the other end of which is in contact with the other end of the seesaw member 410, The other end of the seesection member 410 moves upward and presses the electronic switch 300 to supply power to the driving motor 110 side.

A first paddle member 421 and a second paddle member 422 are connected to one side of the first paddle member 421 and the second paddle member 422 to provide a safety switch (421a, 422a), respectively.

The safety switches 421a and 422a are plate-shaped members rotatably arranged in a central region between the first paddle member 421 and the second paddle member 422, The end portions of the safety switches 421a and 422a are selectively brought into contact with the outer surface of the body 100 to restrict the movement of the first paddle member 421 and the second paddle member 422. [

The operation of the grinder having the automatic power cutoff unit according to an embodiment of the present invention will be described with reference to FIGS. 3 to 5. FIG.

3, in order to supply power to the drive motor 110 side by the operation of the first paddle member 421, the safety switch 421a provided in the first paddle member 421 is rotated So as to be parallel to the outer surface of the first paddle member 421. (a)

When the first paddle member 421 is pushed into one side of the first paddle member 421 with the fingers to be pulled into the inside of the body 100, the seesection member hinged to the end of the first paddle member 421 410 are moved to the upper side. (B)

As one end of the seesaw member 410 moves upward, the plate surface of the seesection member 410 presses the electronic switch 300 to supply power to the drive motor 110 side, thereby enabling a grinder operation. (c)

4, in order to supply power to the driving motor 110 side by the operation of the second paddle member 422, the safety switch 422a provided on the second paddle member 422 is rotated 2 parallel to the outer surface of the paddle member 422. (a)

When the second paddle member 422 is pushed into one side of the second paddle member 422 with the fingers to be inserted into the inside of the body 100, the seesection member 410 (B) of Fig.

As the other end of the seesection member 410 moves upward, the plate surface of the seesection member 410 presses the electronic switch 300 to supply power to the drive motor 110 side, thereby enabling the grinder operation. (c)

5, in order for the first paddle member 421 and the second paddle member 422 to operate at the same time to supply power to the driving motor 110 side, the above- The grinding operation can be performed by using the grinder.

 Therefore, when the worker performs the work by supplying the power by the above-mentioned three methods, if the grinder is missed by mistake, the seesaw member pressing the electronic switch 300 by the elastic spring installed inside the electronic switch 300, The power supply 410 is automatically moved to the lower side, so that the safety of the operator can be assured.

When the seesection member 410 presses the electromagnetic switch 300 by any one of the first paddle member 421 and the second paddle member 422, power is supplied to the drive motor 110 side The worker can grind with one hand.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It is to be understood that both the technical idea and the technical spirit of the invention are included in the scope of the present invention.

100: body 110: drive motor
120: rotating shaft 200: grinder
300: Electronic switch 400: Automatic power-off unit
410: seesaw member 420: paddle portion
421: first paddle member 421a: safety switch
422: second paddle member 422a: safety switch

Claims (6)

A body 100 having a rotation shaft 120 accommodating the driving motor 110 and rotationally driven by the operation of the driving motor 110;
A grinder 200 fixedly coupled to an end of the rotary shaft 120 disposed outside the body 100 and rotating according to rotation of the rotary shaft 120 to perform a grinding operation;
An electronic switch 300 provided at one side of the body to selectively supply power to the driving motor 110;
The electronic switch 300 is selectively operated according to whether the operator's hands are gripped with respect to the body 100 in contact with one side of the electronic switch 300 to control power supply to determine whether the grinder 200 is rotated An automatic power cut-off unit 400 for determining the automatic power cut-off unit 400; Including,
The automatic power shutoff unit 400 includes a bar shaped segregation member 410 disposed inside the body 100 and contacting an end of the electronic switch 300, The end portion of the body 100 is hinged to one side of the body 100 so that power is supplied to the driving motor 110 side by pressing the body 300 and the operator contacts the lower surface of the seesection member 410, And a paddle portion (420) arranged to be pulled inwardly of the body (100) according to the grip,
The paddle unit 420 includes a first paddle member 421 having one end hinged to the body 100 and the other end hinged to one end of the seeside member 410, And a second paddle member 422 hinged to be in contact with the other end of the seesection member 410,
The first paddle member 421 and the second paddle member 421 are formed in a plate shape so as to restrain the movement of the first paddle member 421 and the second paddle member 422 into the inside of the body 100, And safety switches (421a, 422a) in the form of plates are rotatably disposed in a central region between the paddle members (422). delete The method according to claim 1,
The electronic switch 300 is provided with a separate elastic spring for elastically supporting the seesalt member 410 in a direction opposite to the direction in which the electronic switch 300 is pressed by the seesalt member 410 Wherein the automatic power cut-off portion is provided with a cut-out portion. delete delete The method according to claim 1,
The first paddle member 421 and the second paddle member 422 are disposed at a position where a worker's right and left fingers grip the body 100 when the operator grips the body 100 Characterized in that the automatic power cut-off is provided.


KR1020150045776A 2015-03-31 2015-03-31 Grinder having auto intercepting part for power KR101631236B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150045776A KR101631236B1 (en) 2015-03-31 2015-03-31 Grinder having auto intercepting part for power

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Application Number Priority Date Filing Date Title
KR1020150045776A KR101631236B1 (en) 2015-03-31 2015-03-31 Grinder having auto intercepting part for power

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KR101631236B1 true KR101631236B1 (en) 2016-06-17

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190033110A (en) 2017-09-20 2019-03-29 계양전기 주식회사 Apparatus and method for safety control of grinder
KR20220089364A (en) 2020-12-21 2022-06-28 순천제일대학산학협력단 safety device for automatic stop of hand grinder
WO2024122884A1 (en) 2022-12-08 2024-06-13 주식회사 아임삭 Electric grinder having safety means

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008229740A (en) * 2007-03-16 2008-10-02 Hitachi Koki Co Ltd Power tool
JP5541497B2 (en) * 2010-02-26 2014-07-09 日立工機株式会社 Electric tool

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008229740A (en) * 2007-03-16 2008-10-02 Hitachi Koki Co Ltd Power tool
JP5541497B2 (en) * 2010-02-26 2014-07-09 日立工機株式会社 Electric tool

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190033110A (en) 2017-09-20 2019-03-29 계양전기 주식회사 Apparatus and method for safety control of grinder
KR20220089364A (en) 2020-12-21 2022-06-28 순천제일대학산학협력단 safety device for automatic stop of hand grinder
WO2024122884A1 (en) 2022-12-08 2024-06-13 주식회사 아임삭 Electric grinder having safety means
KR20240085417A (en) 2022-12-08 2024-06-17 주식회사 아임삭 Portable power tools

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