KR101715280B1 - An electrically-drive tool - Google Patents

An electrically-drive tool Download PDF

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Publication number
KR101715280B1
KR101715280B1 KR1020150150251A KR20150150251A KR101715280B1 KR 101715280 B1 KR101715280 B1 KR 101715280B1 KR 1020150150251 A KR1020150150251 A KR 1020150150251A KR 20150150251 A KR20150150251 A KR 20150150251A KR 101715280 B1 KR101715280 B1 KR 101715280B1
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KR
South Korea
Prior art keywords
spindle
lock
contact
receiving groove
carrier
Prior art date
Application number
KR1020150150251A
Other languages
Korean (ko)
Inventor
김병조
신영훈
이상홍
염슬기
Original Assignee
계양전기 주식회사
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Filing date
Publication date
Application filed by 계양전기 주식회사 filed Critical 계양전기 주식회사
Priority to KR1020150150251A priority Critical patent/KR101715280B1/en
Application granted granted Critical
Publication of KR101715280B1 publication Critical patent/KR101715280B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
    • B23B45/003—Attachments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools

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

Abstract

A power tool having a spindle lock module comprises: a housing; a lock cage fixedly coupled to an inner surface of the housing, including an accommodating groove; a carrier wherein a plurality of support protrusions arranged on one surface thereof are coupled to the lock cage to be accommodated in the accommodation groove, the other surface is coupled to the output side of a speed reducer; a lock pin arranged as capable of moving in between the support protrusions; and a spindle in which a plurality of contact surfaces coming in contact with the lock spin are formed and fastened to the carrier. The contact surface consists of a plane portion and an inclined surface portion sloping in the direction of another adjacent contact surface at both ends of the plane portion. When the spindle rotates, the lock pin interposed between the inclined surface portion and the inner circumferential surface of the accommodating groove locks the spindle.

Description

An electrically-driven tool

The present invention relates to an electric power tool, and more particularly to a power tool including a spindle lock module.

Generally, a power tool drives a built-in motor using electric power as a power source through a wire or a battery to rotate the tool selectively coupled according to the operation purpose of a driver and a drill to perform multi-task such as tightening a screw or drilling a hole It is one of the tools that can be.

1, a conventional spindle locking device includes a gear rotating plate 10 coupled to a gear box (not shown) for transmitting a rotational force from a motor (not shown) having a rotational power source to receive rotational power of the motor, And a main body (not shown) for receiving and fixing the motor and the gear box.

A first bushing 12 is fixed to the main body. At least one bushing 13 formed on an outer diameter surface of the first bushing 12 is protruded and has a rotation area on its inner diameter surface .

The power transmission portion 15 protrudes from the flat surface of the gear rotating plate 10 and the power transmission portion 15 has an equiangular interval with a predetermined interval on the inner diameter surface of the first bush 12 Three circumferential moving portions 17 sliding in sliding contact with each other and a retaining pin 18 protruding inward from the center of the circumferential moving portion 17 are integrally formed.

A second bushing 19 is rotatably disposed in the rotation region and a plurality of pin receiving portions 21 for accommodating the engaging pin 18 and transmitting power are formed at regular angular intervals, Three pairs of abutting portions 23 are provided on both sides of the accommodating portion 21 and are in sliding contact with the inner side surface of the circumferential moving portion 17.

A spindle 24, which rotates according to the driving force of the gear box, is inserted into the fixing hole 25 at the center of the second bush 19.

A plurality of restraining rollers 27 for locking and releasing the driving force are formed in the space formed between the outer surface of the second bushing and the inner surface of the first bushing located between the circumferential moving parts of the power transmitting part Is located.

The roller 27 is located on a flat string adjacent to the contact portion 23 of the second bush 19.

The operation of the automatic spindle locking device according to the related art as described above is as follows. As shown in FIG. 2, first, when the motor drives the gear rotating plate 10 through the gear box, the power transmitting portion 15 formed at equal angular intervals on the gear rotating plate 10 rotates. Then, the circumferential moving part 17 moves the restraining releasing roller 27 and simultaneously rotates the second bushing 19 to drive the spindle 24 coupled to the fixing hole 25.

At this time, the roller 27 is allowed to flow in a predetermined space located between the circumferential moving parts 17, and the power transmitting part 15 is in a state in which the circumferential moving part 17 and the first bushing 12 In a state of being rotated.

3, when the user rotates the spindle 24, the fixing hole 25 is driven to rotate the second bush 19 (see FIG. 3) . The second bushing 19 rotates the engaging pin 18 of the power transmitting portion 15 to rotate the one circumferential moving portion 17 so that the contact portion 23 is exposed.

The roller 27 is engaged with the contact portion 23 and the inner diameter surface of the first bushing 12 to lock the rotation operation.

However, in the conventional automatic spindle locking device, the restraining releasing roller 27 must be simultaneously restrained to at least two contact portions 23 among three contact portions 23 formed at intervals along the circumference of the second bushing 19 The rotation of the spindle 24 can be blocked.

If only one of the restraining release rollers 27 is restrained, the spindle 24 can rotate, so that it is impossible to surely mount a tool part such as a disc for a grinder or a drill bit.

Further, since the structure includes the gear rotating plate 10, the first bushing 12, and the second bushing 19 in addition to the restraining release roller 27 and the spindle 27, It is the cause.

Korean Patent No. 10-0539694

SUMMARY OF THE INVENTION The present invention provides a power tool capable of improving reliability of a spindle lock by forming a spherical surface on a contact surface of a spindle.

In order to solve the above problems, an embodiment of the present invention is a power tool including a spindle lock module,

housing; A locking cage fixedly coupled to an inner surface of the housing and including a receiving groove; A carrier coupled to the rock cage such that a plurality of support protrusions disposed on one surface thereof are received in the receiving groove, and the other surface is engaged with an output side of the speed reducer; A lock pin movably disposed between the support protrusions; And a spindle having a plurality of contact surfaces contacting the lock pin and fastened to the carrier,

The contact surface includes a flat surface portion; And an inclined surface section inclined in the direction of another adjacent contact surface at both ends of the plane section.

Wherein the rock cage includes a through hole through which the spindle passes at the center of the receiving groove; And a bearing coupled to an outer circumferential surface of the spindle at a lower side of the through hole.

It is preferable that a plurality of coupling protrusions are formed on the outer peripheral surface of the rock cage.

The carrier includes a fastening hole through which the spindle is inserted through one surface and the other surface, and the fastening hole can be formed so that the spindle can be rotated at a predetermined angle.

The support protrusion is disposed at an equal angle along the fastening hole and has an outer diameter surface slidingly contacting the inner circumferential surface of the receiving groove; An inner diameter surface in contact with the spindle; And both sides connecting the outer diameter surface and the inner diameter surface.

The lock pin is interposed between the inclined surface portion and the inner circumferential surface of the receiving groove to lock the spindle when the spindle rotates.

The spindle may further include a curved surface portion formed between adjacent inclined surface portions.

The contact surface preferably has an angle formed by the plane portion with the inclined surface portion within a range of 165 to 172 degrees.

As described above, according to the present invention, various effects including the following can be expected. However, the present invention does not necessarily achieve the following effects.

According to the present invention, it is possible to prevent the lock pin from being repelled due to the conventional slip or the like due to the provision of the rotation angle for the spindle lock, so that the spindle lock state can be realized in a fairly stable manner.

This is very cost effective because it is possible only by simple structural change of the spindle contact surface.

1 is an exploded perspective view of a conventional automatic spindle locking device.
2 is a cross-sectional view illustrating the spindle releasing operation
3 is a cross-sectional view illustrating a spindle locking operation
4 is a perspective view illustrating a spindle lock module according to an embodiment of the present invention.
Fig. 5 is a perspective view of Fig.
Fig. 6 is a side view of Fig.
7 is a cross-sectional view taken along the line AA in Fig. 6
8 is an enlarged view of a portion B in Fig. 4
Figure 9 is a side view of the spindle of Figure 4;

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

FIG. 4 is a perspective view of a spindle lock module according to an embodiment of the present invention, FIG. 5 is a perspective view of FIG. 4, and FIG. 6 is a side view of FIG.

4 to 6, a power tool according to an embodiment of the present invention includes a housing (not shown), a lock cage 60, a carrier 70, a lock pin 80, and a spindle 90.

The housing (not shown) is a case that accommodates a series of components for implementing the spindle lock function.

The lock cage 60 provides space for the spindle lock by the lock pin 80 or the like.

The lock cage 60 is fixedly coupled to the inner surface of the housing (not shown). That is, the lock cage 60 is always fixed regardless of the rotation of the carrier 70.

A plurality of coupling protrusions 64 are formed on the outer circumferential surface of the rock cage 60 according to an embodiment of the present invention as a fixing means. Correspondingly, a groove or the like will be further formed on the inner surface of the housing (not shown).

The lock cage (60) has a receiving groove (62) formed on one surface thereof. A through hole (not shown) through which the spindle 90 passes is formed at the center of the receiving groove 62. In addition, a bearing (not shown) is provided below the through hole (not shown) to engage with the outer peripheral surface of the spindle 90.

That is, the spindle 90 is inserted into the inner circumferential surface of the bearing (not shown) to penetrate the lock cage 60 in a state of being coupled with a bearing (not shown).

The carrier 70 has a plurality of support protrusions 74 inserted into the receiving grooves 62 on one surface thereof. The other side is engaged with the output side of a speed reducer (not shown) that rotates the carrier 70.

Further, the carrier 70 is formed with a fastening hole 72 through which the spindle is inserted through one surface and the other surface. At this time, the fastening holes 72 are formed to be rotatable at a predetermined angle in a state where the spindle 90 is fastened. The fastening holes 72 are basically formed to reflect the shape of the spindle 90 to be inserted.

However, since the fastening hole 72 is not in close contact with the spindle 90, the spindle 90 is slightly rotatable. However, this will be greater than the maximum rotation angle for the spindle lock.

Referring to Fig. 7, the support protrusions 74 are disposed at equal angular intervals around the fastening holes 72. As shown in Fig.

The support protrusion 74 is composed of an outer diameter surface, an inner diameter surface, and both side surfaces. And the outer diameter surface thereof makes a sliding contact with the inner circumferential surface of the receiving groove 62. And the inner diameter surface contacts the spindle 90. Both sides connect the outer diameter surface and the inner diameter surface.

A lock pin 80 is disposed between the support protrusions 74. The lock pin 80 can move between the support protrusions 74 in a cylindrical shape. That is, when the support protrusion 74 rotates together with the rotation of the carrier 70, the side surface of the support protrusion 74 pushes the lock pin 80 to move.

In particular, the lockpin 80 is formed of a metal material and is rigid, so that it is not deformed by an external force.

The spindle 90 has a plurality of contact surfaces 92 at one end which contact the lock pin, and is fastened to the carrier 70. The spindle 90 according to an embodiment of the present invention has three contact surfaces 92, and the profile is similar to a triangle. Three are optimal when considering cost versus effect.

FIG. 8 is an enlarged view of part B of FIG. 4, and FIG. 9 is a side view of the spindle 90 of FIG.

Referring to Fig. 8, each contact surface 92 is composed of a planar portion 92a and an inclined surface portion 92b.

The plane portion 92a is disposed at the center portion of the contact surface 92. [ The inclined surface portion 92b is formed to be inclined in the direction of another adjacent contact surface 92 at both ends of the plane portion 92a.

The reason why the contact surface 92 in the present invention further includes not only the planar portion 92a but also the inclined surface portion 92b is as follows.

To lock the spindle, the spindle 90 must be rotated within a certain angular interval.

The spindle lock is a state in which the lock pin 80 is sandwiched between the inner peripheral surface of the receiving groove 62 and the contact surface 92 of the spindle 90 so that the spindle 90 can no longer rotate. At this time, in order to maintain the lock stably, at least two inserted lock pins 80 are required.

However, if the contact surface 92 is formed only by the flat surface portion 92a, the lock pin 80 is easier to bounce off before being fitted.

8, let us consider a change in the straight line distance (L, shortest distance) from the center 95 of the spindle 90 to the contact surface 92 in accordance with the rotation angle of the spindle 90 . At this time, the straight line distance is measured from the midpoint of the contact surface 92 as a starting point to either end.

First, if the contact surface 92 exists only in the plane portion 92a, the linear distance L due to the rotation of the spindle 90 must be continuously increased. This can be modeled as a distance change from one vertex to the opposite side located at both ends of the hypotenuse of the right triangle.

That is, the distance from the vertex to the vertex positioned vertically is the shortest, and the distance to the other vertex constituting the hypotenuse, that is, the length of the hypotenuse, is the longest. Also, it continues to increase from the shortest distance to the longest distance.

As described above, the lactone 80 is rigid and very hard. Thus, the lockpin 80 may not fit frequently, even if a lockable spindle 90 rotation is provided.

Therefore, in order to provide a reliable spindle lock module, it is necessary to first consider whether the lock pin 80 can be stably inserted in the range of the linear distance L (stable section).

For this purpose, the diameter of the lock pin 80, the friction coefficient of the fastening hole 72 and the contact surface 92, the void space formed between the fastening hole 72 and the contact surface 92, and the like should be considered.

However, the stable section may be a very small section including the lock pin 80, considering that the spindle 90, the carrier 70, etc. are all rigid bodies.

In the present invention, the structural shape of the spindle 90 is modified so that the linear distance L along the rotation of the spindle 90 is within the stable section. That is, by forming the inclined surface portion 92b at both ends of the contact surface 92 of the spindle 90, the linear distance L is increased from the starting point of the inclined surface portion 92b to a very gentle degree.

As a result, the probability of the lock pin 80 bouncing along with the rotation of the spindle 90 is significantly reduced. That is, the lock pin 80 can be fitted very stably in the rotation angle range for the spindle lock.

This is because the rotation angle range of the spindle 90 to be placed in the stable section where the lock takes a long time is widened so that the lock pin 80 has a time margin for fitting between the inclined surface portion 92b and the inner peripheral surface of the receiving groove 62 Because.

The spindle-lockable rotation angle according to an embodiment of the present invention is formed within 8 to 15 degrees. However, the rotation angle range that can be spindle-locked can be changed according to the friction coefficient of the contact surface 92 of the spindle 90 or the like.

This is equivalent to an angle formed by the plane portion 92a of the spindle 90 and the slope portion 92b, that is, the slope angle 100 ranges from 165 to 172 degrees (see FIG. 9) This is because the angle of rotation is the same as the angle formed by the extension of the flat surface portion 92a and the inclined surface portion 92b.

As described above, the number of contact surfaces 92 of the spindle 90 in the present invention is three. That is, the profile is close to a triangle. However, the curved surface portion 94 is connected between the inclined surface portions 92b adjacent to each other, thereby minimizing the friction with the fastening holes 72. [

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

60: rock cage 62: receiving groove
64: engaging projection 70: carrier
72: fastening hole 74: support projection
80: Lockpin 90: Spindle
92: contact surface 92a:
92b: an inclined surface portion 94: a curved surface portion
95: center 100: inclination angle

Claims (8)

A power tool comprising a spindle lock module,
housing;
A locking cage fixedly coupled to an inner surface of the housing and including a receiving groove;
A carrier coupled to the rock cage such that a plurality of support protrusions disposed on one surface thereof are received in the receiving groove, and the other surface is engaged with an output side of the speed reducer;
A lock pin movably disposed between the support protrusions; And
And a spindle having a plurality of contact surfaces contacting the lock pin and fastened to the carrier,
The contact surface
A flat portion; And
And an inclined surface section inclined at a direction of another adjacent contact surface at both ends of the plane section,
Wherein the lock pin is interposed between the inclined surface portion and the inner circumferential surface of the receiving groove to lock the spindle when the spindle rotates.
The method according to claim 1,
The rock cage
A through hole through which the spindle passes at the center of the receiving groove; And
And a bearing that engages with an outer circumferential surface of the spindle at a lower side of the through hole.
The method according to claim 1,
Wherein a plurality of engaging projections are formed on an outer circumferential surface of the rock cage.
The method according to claim 1,
The carrier
A coupling hole through which the spindle is inserted through one surface and the other surface,
Wherein the fastening hole is formed such that the spindle is rotatable at a predetermined angle.
5. The method of claim 4,
The support protrusions are disposed at equal angles along the fastening holes,
An outer diameter surface slidingly contacting the inner circumferential surface of the receiving groove;
An inner diameter surface in contact with the spindle; And
And both side surfaces connecting the outer diameter surface and the inner diameter surface.
delete The method according to claim 1,
The spindle
And a curved surface portion formed between the inclined surface portions adjacent to each other.
8. The method according to any one of claims 1 to 5 and 7,
The contact surface
Wherein an angle formed by the plane portion with the inclined surface portion is within a range of 165 to 172 degrees.
KR1020150150251A 2015-10-28 2015-10-28 An electrically-drive tool KR101715280B1 (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
KR1020150150251A KR101715280B1 (en) 2015-10-28 2015-10-28 An electrically-drive tool

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200036966A (en) * 2018-09-28 2020-04-08 계양전기 주식회사 Spindle locking apparatus, electronic tool and actuator for vehicle using the same
KR20210061521A (en) * 2019-11-19 2021-05-28 계양전기 주식회사 Spindle locking device and power tool and actuator for vehicle
KR20210143392A (en) * 2020-05-20 2021-11-29 박춘석 Handpiece having a diamond abrasive element method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100539694B1 (en) 2003-12-30 2005-12-28 계양전기 주식회사 locking apparatus of spindle
JP2007283471A (en) * 2006-04-20 2007-11-01 Makita Corp Mechanism for locking spindle of screw driving machine
KR20130071654A (en) * 2011-12-21 2013-07-01 계양전기 주식회사 Spindle locking apparatus
JP2014161947A (en) * 2013-02-25 2014-09-08 Hitachi Koki Co Ltd Power tool
JP2015139856A (en) * 2014-01-29 2015-08-03 日立工機株式会社 Power tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100539694B1 (en) 2003-12-30 2005-12-28 계양전기 주식회사 locking apparatus of spindle
JP2007283471A (en) * 2006-04-20 2007-11-01 Makita Corp Mechanism for locking spindle of screw driving machine
KR20130071654A (en) * 2011-12-21 2013-07-01 계양전기 주식회사 Spindle locking apparatus
JP2014161947A (en) * 2013-02-25 2014-09-08 Hitachi Koki Co Ltd Power tool
JP2015139856A (en) * 2014-01-29 2015-08-03 日立工機株式会社 Power tool

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200036966A (en) * 2018-09-28 2020-04-08 계양전기 주식회사 Spindle locking apparatus, electronic tool and actuator for vehicle using the same
KR102152336B1 (en) * 2018-09-28 2020-09-07 계양전기 주식회사 Spindle locking apparatus, electronic tool and actuator for vehicle using the same
KR20210061521A (en) * 2019-11-19 2021-05-28 계양전기 주식회사 Spindle locking device and power tool and actuator for vehicle
KR102261112B1 (en) * 2019-11-19 2021-06-08 계양전기 주식회사 Spindle locking device and power tool and actuator for vehicle
KR20210143392A (en) * 2020-05-20 2021-11-29 박춘석 Handpiece having a diamond abrasive element method thereof
KR102350829B1 (en) * 2020-05-20 2022-01-13 박춘석 Handpiece having a diamond abrasive element method thereof

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