JP2014037038A - Electric tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric tool which enables replacement of a bit not by using a special tool such as a spanner but by de-mounting or mounting the bit.SOLUTION: An engaging member 61 comes, when positioned at an engaging position (P2), into engagement with the outer circumference of a nut member 51 so that the nut member 51 can turn a screw along a rotation axis 40 thereof. On the contrary, the engaging member 61 goes, when positioned at a retracted position, out of engagement with the outer circumference of the nut member 51 so that the nut member 51 cannot turn the screw. Here, a biasing screw 75 biases the engaging member 61 backward so that the arrangement of the engaging member 61 is switched from the engaging position (P2) to the retracted position. In other words, the engaging member 61 of an operation mechanism 60 can be positioned at the retracted position in the ordinary state. In the operation time, a bit B can be removed or attached by operating the engaging member 61 to move to the engaging position (P2).

Description

  The present invention relates to an electric tool in which an attachment mechanism for attaching a tip tool is disposed with respect to an output shaft.

  2. Description of the Related Art Conventionally, an electric tool that is also called a dust-proof boat trimmer or a cut-out tool and is used for a processing operation such as a gypsum board cutting operation is known (for example, see Patent Document 1). This type of electric tool includes a drive motor that generates a rotational drive force, and an output spindle (output shaft) that is rotationally driven by the rotational drive force of the drive motor. An attachment mechanism for attaching a machining bit (tip tool) is disposed at the tip of the output spindle. A bit selected in accordance with processing such as the above-described cutting processing is attached to the attachment mechanism. This attachment mechanism is configured so that it can be replaced with various bits. In addition, with respect to the conventional attachment mechanism, the bit was replaced by using a dedicated tool such as a spanner.

"Instruction Manual Dust-proof Board Trimmer Model 3706" (Issue Date: February 2006 Publisher: Makita Corporation)

  However, if a special tool such as a spanner is always used to replace the bit, the user of the electric tool is burdened with managing the special tool. For this reason, it has been pointed out that such management work is complicated, and there is a demand for reducing the burden of such management work.

  The present invention has been made in view of such circumstances, and the problem to be solved by the present invention is that a power tool in which a mounting mechanism for mounting a bit is disposed on an output spindle is used exclusively for a spanner or the like. The purpose is to enable bit replacement by removing the bit or attaching the bit without using a tool.

In solving the above-described problems, the power tool according to the present invention takes the following means.
That is, the electric tool according to the first aspect of the present invention is an electric tool in which an attachment mechanism for attaching a tip tool is disposed on the output shaft, and the attachment mechanism is attached to the tip of the output shaft. An insertion member into which the tip tool is inserted at the rotation axis of the output shaft, a fastening member disposed on the outer periphery of the insertion member, and an operating mechanism for operating the position of the fastening member with respect to the insertion member, A male screw portion is provided on the outer peripheral surface of the insertion member, and a female screw portion that engages with the male screw portion and the female screw with respect to the male screw portion are provided on the inner peripheral surface of the fastening member. A diameter-reducing portion that presses the outer peripheral surface of the insertion member inward so as to reduce the inner diameter of the insertion member in accordance with the screwing position of the portion, and the operation mechanism includes the rotation axis of the fastening member Engagement with the outer peripheral surface of the fastening member so as to enable screw turning along And an engaging member that can be switched to a retracted position that is disengaged from the outer peripheral surface of the fastening member so that the screwing of the fastening member is disabled, and holds the output shaft The housing is configured to be able to hold an elastic body, and the elastic body has one end abutting on the housing side and the other end so as to switch the arrangement of the engagement member from the engagement position to the retracted position. Abuts against the engaging member side and biases the engaging member.

  According to the electric tool of the first invention, when the engaging member is located at the engaging position, the engaging member is engaged with the outer peripheral surface of the fastening member to enable screwing along the rotation axis of the fastening member. On the other hand, when the engaging member is located at the retracted position, it is disengaged from the outer peripheral surface of the fastening member and the fastening member cannot be screwed. Here, the housing that holds the output shaft is configured to be able to hold an elastic body, and the elastic body biases the engaging member with one end contacting the housing side and the other end contacting the engaging member side. . In this way, the elastic body acts to switch the arrangement of the engaging member from the engaging position to the retracted position. Thereby, at the normal time, the engaging member of the operation mechanism can be positioned at the retracted position. Moreover, at the time of operation, a tip tool can be removed or a tip tool can be attached by operating so that an engagement member may be moved to an engagement position. That is, the tip tool can be replaced without using a dedicated tool such as a spanner.

Moreover, the electric tool which concerns on 2nd invention is the electric tool which concerns on the said 1st invention. WHEREIN: The said retracted position of the said engagement member is shifted from the said engagement position in the direction in alignment with the rotating shaft line of the said fastening member. It is set by this. According to the electric tool of the second invention, the retracted position of the engaging member is set by being shifted from the engaged position in the direction along the rotation axis of the fastening member. The position can be changed easily.
The electric power tool according to a third aspect of the present invention is the electric power tool according to the first or second aspect of the invention, wherein at least one of the abutment at one end and the abutment at the other end of the elastic body is slidable. It is characterized by being set as an abutment. According to the power tool of the third aspect of the present invention, at least one of the abutment at one end and the abutment at the other end of the elastic body is set as a slidable abutment. The operated engagement member can be smoothly performed without increasing the number of members.
Moreover, the electric tool which concerns on 4th invention is the electric tool which concerns on the said 2nd or said 3rd invention, The said elastic body is a protrusion part provided in the said housing, This protrusion part, the said engagement member, It is arrange | positioned between. According to the electric tool according to the fourth aspect of the present invention, the arrangement location of the elastic body can be easily formed.
The electric power tool according to a fifth aspect of the present invention is the electric power tool according to any one of the first to fourth aspects, wherein the engagement position of the engagement member is the retraction position of the engagement member. In comparison, it is set at a position moved relative to or away from the housing. According to the electric tool of the fifth invention, the structure can be simplified, which is advantageous in manufacturing.

An electric power tool according to a sixth aspect of the present invention is an electric power tool in which an attachment mechanism for attaching a tip tool is disposed with respect to an output shaft, and the attachment mechanism has a rotation axis of the output shaft at the tip of the output shaft. The insertion member into which the tip tool is inserted, a fastening member disposed on the outer periphery of the insertion member, and an operation mechanism for operating the position of the fastening member with respect to the insertion member, A male screw portion is provided on the outer peripheral surface, and a female screw portion to be screwed with the male screw portion on the inner peripheral surface of the fastening member, and a screwing position of the female screw portion with respect to the male screw portion. And a diameter-reducing portion that presses the outer peripheral surface of the insertion member inward so as to reduce the inner diameter of the insertion member, and the operation mechanism is supported by a housing that holds the output shaft, and A rotating support that is rotatable about the same axis of rotation as the screwdriver; A rotational support shaft provided on the rotational support along the rotational tangential direction of the rotational support, and is rotatably supported by the rotational support shaft and rotated to an engagement position and a retracted position. An engagement member that can be switched in position, and the engagement position of the engagement member is engaged with the outer peripheral surface of the fastening member so as to enable screwing along the rotation axis of the fastening member. The retracted position of the engaging member is a position that is disengaged from the outer peripheral surface of the fastening member so that the screwing of the fastening member is not possible.
According to the electric tool of the sixth aspect of the invention, the operation mechanism includes the rotation support, the rotation support shaft, and the engagement member, so that the engagement member is rotated about the rotation support shaft. Thus, the arrangement can be switched from the retracted position to the engaged position. Here, the engagement member positioned at the engagement position can be rotated by the rotation support body on the rotation axis of the screw rotation of the fastening member. Accordingly, the screw can be turned along the rotation axis of the fastening member, and the same effects as those of the first invention can be achieved. That is, the tip tool can be replaced without using a dedicated tool such as a spanner.
An electric power tool according to a seventh aspect is the electric power tool according to the sixth aspect, wherein an outer peripheral surface of the fastening member has a prism shape, and the engagement member is engaged with the prism shape of the fastening member. A wrench is provided. According to the electric tool of the seventh invention, the outer peripheral surface of the fastening member has a prismatic shape, and the engaging member has a spanner portion that engages with the prismatic shape of the fastening member. A general-purpose product can be used as it is, and it can be excellent from the viewpoint of productivity, such as reducing the manufacturing cost.

  A rotary electric tool according to an eighth aspect of the present invention includes an output shaft that is rotationally driven, a fixing member that is provided on the output shaft and fixes the tip tool, a first position where the fixing member can be operated, and the fixing member. And an operation member that can be positioned at the second position where it cannot be operated. According to the electric tool of the eighth aspect of the invention, the fixing member can be made operable or inoperable by changing the position of the operation member.

According to the electric tool according to the first invention, the tip tool can be replaced without using a dedicated tool such as a spanner.
According to the electric tool of the second invention, the position change from the retracted position to the engaged position can be easily performed.
According to the electric tool according to the third aspect of the invention, it is possible to smoothly operate the operation mechanism biased by the elastic body without increasing the number of members.
According to the power tool of the fourth invention, the location where the elastic body is disposed can be easily formed.
According to the electric tool of the fifth invention, the structure can be simplified, which is advantageous in manufacturing.
According to the electric tool according to the sixth aspect of the present invention, the tip tool can be replaced without using a dedicated tool such as a spanner.
The power tool according to the seventh aspect of the invention can be made excellent from the viewpoint of productivity such as reducing the manufacturing cost.
According to the power tool of the eighth invention, the fixing member can be made operable or inoperable by changing the position of the operation member.

It is an external appearance side view of the electric tool used as a 1st embodiment. FIG. 2 is an internal cross-sectional view showing the inside of the electric power tool of FIG. It is an internal sectional view which shows the inside of the electric tool of FIG. It is an expansion perspective view which expands and shows the part of the front side of an electric tool. FIG. 3 is an enlarged internal cross-sectional view illustrating an output unit in FIG. 2. FIG. 4 is an enlarged internal cross-sectional view illustrating an output unit in FIG. 3. FIG. 7 is an internal cross-sectional view when the operation mechanism of FIG. 6 is operated. It is an external appearance front view of the electric tool of FIG. FIG. 3 is an internal cross-sectional view showing a cross-sectional arrow (IX)-(IX) in FIG. 2. FIG. 3 is an internal cross-sectional view showing a cross-sectional arrow (X)-(X) in FIG. 2. FIG. 3 is an internal cross-sectional view showing a cross-sectional arrow (XI)-(XI) in FIG. 2. It is the (a) perspective view and (b) sectional view about a tip insertion member. It is the (a) perspective view and (b) sectional view about a nut member. It is an internal schematic cross section typically showing the operation mechanism of the second embodiment. FIG. 15 is an internal schematic cross-sectional view when the operation mechanism of FIG. 14 is operated. It is an internal cross section which shows the inside of the tool main body used as 3rd Embodiment by an up-and-down halved cross section. It is an expansion perspective view which shows the electric tool from which an engaging member becomes non-engagement by a left upper perspective. It is an expansion perspective view which shows the electric tool which an engaging member engages with a lower left perspective view. It is an expansion perspective view which shows the electric tool which an engaging member engages with a right-upper perspective view. It is an external appearance front view of the electric tool of FIG. FIG. 17 is an internal cross-sectional view showing a cross-sectional arrow (XXI)-(XXI) in FIG. 16. FIG. 17 is an internal cross-sectional view showing a cross-sectional arrow (XXII)-(XXII) in FIG. 16. FIG. 17 is an internal cross-sectional view showing a cross-sectional arrow (XXIII)-(XXIII) in FIG. 16. It is a front view which shows the 1st example of the engagement pattern of a nut member and an engagement member. It is a front view which shows the 2nd example of the engagement pattern of a nut member and an engagement member.

[First Embodiment]
Hereinafter, the form for implementing the electric tool concerning the present invention is explained. In addition, the electric tool demonstrated below is an electric tool called what is called a cutout tool used for processing operations, such as a cutting operation of a gypsum board.
The electric power tool 10 which becomes 1st Embodiment is demonstrated referring FIGS. 1-13. FIG. 1 is an external side view of an electric power tool 10 according to the first embodiment. FIG. 2 is an internal cross-sectional view showing the inside of the electric power tool 10 of FIG. FIG. 3 is an internal cross-sectional view showing the inside of the electric power tool 10 of FIG. FIG. 4 is an enlarged perspective view showing a front portion of the electric tool 10 in an enlarged manner. In addition, in order to make it easy to understand in explaining, the electric tool 10 described below defines the upper, lower, front, rear, left, and right of the electric tool 10 as illustrated. Moreover, in FIG. 1, only the tool main body 11 from which the rechargeable battery 15 is removed is illustrated. The electric tool 10 is a so-called hand-held rotary electric tool that is used by being gripped with a hand.

  That is, the electric tool 10 shown in FIGS. 1 to 4 schematically includes a tool body 11, a rechargeable battery 15, and a shoe 17. The rechargeable battery 15 is attached to the tool body 11 as a power source for the electric tool 10. The rechargeable battery 15 is charged by a dedicated charger (not shown) after being discharged by use. The rechargeable battery 15 is mounted on the mounting portion 13 provided at the rearmost portion of the tool body 11 so as to slide from top to bottom. The shoe 17 sets a processing protrusion amount of the bit B with respect to the shoe 17 by determining a relative position with respect to the tool body 11. For this reason, the shoe 17 is disposed in the foremost part of the tool body 11. The shoe 17 includes a facing portion 171 that faces the workpiece, and an attachment portion 172 that is attached to the tool body 11 by a knob screw 18. The attachment portion 172 is provided with a long hole 173 that extends in the front-rear direction. The facing portion 171 and the attachment portion 172 extend in a direction intersecting with each other. The shoe 17 is slid in the front-rear direction with respect to the tool main body 11 and is fixed by a knob screw 18 at an appropriately determined position. Note that the bit B attached by the bit attachment mechanism 41 described later protrudes forward from the shoe 17 whose arrangement has been adjusted. The protruding length of the bit B is determined by the arrangement position of the shoe 17. The bit B corresponds to the cutting tool for machining according to the present invention. In addition, the mounting direction (vertical direction) of the rechargeable battery 15 and the arrangement adjustment direction (front-rear direction) of the shoe 17 are orthogonal to each other.

  Next, the tool body 11 will be described. The tool body 11 is roughly divided into a drive unit 20 that mainly generates a driving force and an output unit 30 that supports the rotation of the output spindle 35. The drive part 20 is comprised over the rear part and intermediate part of the tool main body 11, and mainly converts electric power into rotational drive force. The drive unit 20 is generally configured by mounting various interior members in a motor housing 21 forming an exterior. As shown in FIG. 2, the motor housing 21 is formed in half in the left-right direction. The mounting portion 13 described above is provided at the rearmost portion of the motor housing 21. The motor housing 21 includes a controller 22, a switch 23, a brush motor 25, and a fan 29 in order from the back to the front. The controller 22 controls the power supply from the rechargeable battery 15 according to appropriate conditions. The switch 23 is input by a slide operation in the front-rear direction of the slide switch 231 exposed to the outside. Specifically, the slide switch 231 is formed long in the front-rear direction. When the user moves the slide switch 231 forward, the switch can be turned on by operating the rear end of the operation part of the switch 23 on the front surface of the rear end of the slide switch 231. The brush motor 25 is configured similarly to a widely used brush motor. The brush motor 25 includes a motor shaft 26 that is rotationally driven. The motor shaft 26 is rotatably driven by a rear bearing 27 and a front bearing 28. For this reason, the motor shaft 26 is rotationally driven by the brush motor 25. The rear bearing 27 is supported by the motor housing 21, and the front bearing 28 is supported by the front housing 31. The fan 29 is attached to the motor shaft 26. The fan 29 is a centrifugal fan. Due to the rotation of the fan 29, wind flows from the rear to the front inside the motor housing 21. The wind from the fan 29 mainly functions as motor cooling air that cools the controller 22, the switch 23, and the brush motor 25 in order. For this reason, the wind introduced into the motor housing 21 is sucked from the air inlet 211 provided in the rear portion of the motor housing 21. Moreover, the wind sucked from the air inlet 211 is blown out from the air outlet 36 provided on the front surface of the electric power tool 10 described later and exhausted to the outside.

Next, the output unit 30 disposed on the front side of the drive unit 20 will be described. In addition,
FIG. 5 is an enlarged internal cross-sectional view of the output unit 30 in FIG. 6 is an enlarged internal cross-sectional view of the output unit 30 in FIG. FIG. 7 is an internal cross-sectional view when the operation mechanism 60 of FIG. 6 is operated. FIG. 8 is an external front view of the electric power tool 10 of FIG. FIG. 9 is an internal cross-sectional view showing a cross-sectional arrow (IX)-(IX) in FIG. FIG. 10 is an internal cross-sectional view showing a cross-sectional arrow (X)-(X) in FIG. FIG. 11 is an internal cross-sectional view showing a cross-sectional arrow (XI)-(XI) in FIG.
As shown in FIGS. 5 and 6, the output unit 30 is configured as a front side portion of the tool body 11. The output unit 30 is a part of the electric tool 10 that mainly grips and rotates the bit B. The output unit 30 generally includes a front housing 31, an output spindle 35, and a bit attachment mechanism 41. As shown in FIG. 4, the front housing 31 that forms the exterior of the output unit 30 is screwed to the front end of the motor housing 21 via four screw members 34. Unlike the motor housing 21 formed in half, the front housing 31 is a metal molded product formed integrally. The front housing 31 is provided with a shape opened at the rear and front. Therefore, as shown in FIG. 5 and the like, the motor shaft 26 can be inserted into the front housing 31 from the rear side, and the output spindle 35 can be protruded from the front side.

As shown in FIG. 4 and the like, the front portion of the front housing 31 is provided with a blowout port 36 for blowing the motor cooling air to the outside. As shown in FIG. 8, four outlets 36 are provided on the front surface of the front housing 31 at equal intervals along the circumferential direction. The outlet 36 is provided on the front surface of the electric tool 10 so that the motor cooling air that is blown out faces the facing portion 171 of the shoe 17. That is, the motor cooling air blown from the blowout port 36 is directed and applied to the workpiece processed by the bit B.
As shown in FIG. 6, the mounting portion 172 of the shoe 17 is attached to the right side surface of the front housing 31 via a knob screw. A shaft lock mechanism 37 is provided on the left side surface of the front housing 31. The shaft lock mechanism 37 fixes the output spindle 35 so as to stop the movement of the output spindle 35 in the rotation direction when the bit B is attached to the bit attachment mechanism 41 described later. Therefore, the shaft lock mechanism 37 includes an operating body 38 that can move a pin that can be inserted into one of the four holes of the output spindle 35 in a radial direction, and a biasing spring 39 that releases the pressure in a normal state. With. The operating body 38 includes an operating body main body 381 that presses the shaft and a pressing cover 382 that forms an exterior.
Incidentally, as shown in FIG. 5 and the like, the front end 261 of the motor shaft 26 protruding from the motor housing 21 to the front side enters the front housing 31. The front end 261 of the motor shaft 26 is press-fitted into a rear end fitting hole 351 provided at the rear end of the output spindle 35. For this reason, the output spindle 35 rotates integrally with the motor shaft 26 to be press-fitted. The output spindle 35 corresponds to the output shaft according to the present invention. A tip insertion member 45 described later is press-fitted into a tip fitting hole 352 provided at the tip of the output spindle 35. Here, a male screw portion 353 that is cut into a male screw shape is provided on the outer peripheral surface of the output spindle 35 into which the tip insertion member 45 is press-fitted. The male screw portion 353 is screwed with a female screw portion 513 of the nut member 51 described later. Thus, the output spindle 35 in which the motor shaft 26 and the tip insertion member 45 are integrated is supported by the bearing 28 for rotational driving. The bearing 28 is fixedly held by the front housing 31.

Next, the bit attachment mechanism 41 provided for the output spindle 35 will be described. The bit attachment mechanism 41 corresponds to the attachment mechanism according to the present invention. The bit attachment mechanism 41 corresponds to a fixing member according to the present invention. The bit attachment mechanism 41 attaches the bit B to the output spindle 35 that is rotationally driven. The bit attachment mechanism 41 generally includes a tip insertion member 45 and a nut member 51. The tip insertion member 45 corresponds to the insertion member according to the present invention. The nut member 51 corresponds to a fastening member according to the present invention. The operation mechanism 60 corresponds to an operation member according to the present invention.
FIG. 12A is a perspective view of the tip insertion member 45. FIG. 12B is a cross-sectional view of the tip insertion member 45 shown in FIG. FIG. 13A is a perspective view of the nut member 51. FIG.13 (b) is (b)-(b) sectional drawing about the nut member 51 illustrated by (a).
As shown in FIGS. 12A and 12B, the tip insertion member 45 to be press-fitted into the tip fitting hole 352 of the output spindle 35 is on the rotation axis 40 (see FIG. 1 and the like) of the output spindle 35. The bit B is set as a fitting insertion hole that allows the bit B to be inserted. Specifically, the tip insertion member 45 has a hole shape that is provided with an opening 46 at the front end and communicates with the inside. The inner peripheral diameter of the tip insertion member 45 having the hole shape is formed so as to be able to be reduced so as to hold the bit B inserted into the tip insertion member 45. Specifically, the tip insertion member 45 is provided with four slits 451 extending in the direction of the rotation axis 40 at equal intervals. By the four slits 451 provided at equal intervals, the distal end insertion member 45 is formed to have four claw shapes that can swing inward and outward. Further, a tapered portion 452 having a tapered shape is provided in the vicinity of the front end of the outer peripheral surface of the tip insertion member 45.

As shown in FIG. 5 and the like, the nut member 51 is disposed on the outer periphery of the above-described tip insertion member 45. An opening 52 into which the bit B is inserted is provided at the front end of the nut member 51. A female screw portion 513 cut into a female screw shape is provided on the inner peripheral surface of the nut member 51 also shown in FIGS. The female screw portion 513 is screwed with a male screw portion 353 provided on the outer peripheral surface of the output spindle 35. Further, near the front end of the inner peripheral surface of the nut member 51, a reduced diameter portion 512 having an inclined shape that matches the tapered portion 452 is provided. The reduced diameter portion 512 is in contact with or not in contact with the tapered portion 452 of the tip insertion member 45 described above, depending on the screwing position of the female screw portion 513 with respect to the male screw portion 353. Or When the reduced diameter portion 512 is in contact with the tapered portion 452, when the nut member 51 is further screwed in the fastening direction with respect to the output spindle 35, the reduced diameter portion 512 is inserted into the distal end. The taper portion 452 of the member 45 is pressed inward. If it does so, the internal diameter of the front-end | tip of this front-end | tip insertion member 45 will act in a reduction | decrease direction. That is, the inner peripheral surface of the tip insertion member 45 presses the outer peripheral surface of the bit B so that the bit B inserted into the opening 46 is held by the tip insertion member 45. At this time, the nut member 51 is positioned at a position (bit gripping position) where the nut member 51 is screwed to the tip insertion member 45.
Further, when the nut member 51 is located at a position where the screw is removed from the tip insertion member 45 (bit removal position), the inner peripheral diameter of the tip insertion member 45 described above is the normal inner diameter. It becomes the circumference. The nut member 51 located at the bit removing position is arranged on the front side compared to the bit gripping position. At this time, the reduced diameter portion 512 of the nut member 51 is positioned without pressing the tapered portion 452 inward. For this reason, the inner peripheral surface of the tip insertion member 45 also does not press the outer peripheral surface of the bit B, and the bit B inserted into the inner peripheral side of the tip insertion member 45 is not gripped by the tip insertion member 45. . That is, this bit B is in a state where it can be inserted and removed from the tip insertion member 45. In this way, the reduced diameter portion 512 has the outer peripheral surface of the tip insertion member 45 on the inner side so as to reduce the inner diameter of the tip insertion member 45 in accordance with the screwing position of the female screw portion 513 with respect to the male screw portion 353. It can be pressed or not pressed. The rotation axis of the nut member 51 is the same rotation axis as the rotation axis 40 of the output spindle 35 described above.

Next, the operation mechanism 60 that enables the above-described bit attachment mechanism 41 to be operated will be described. The operation mechanism 60 corresponds to an operation member according to the present invention. As shown in FIGS. 6 and 7, the operation mechanism 60 is provided with respect to the front housing 31. The operation mechanism 60 generally includes an engagement member 61, a stopper member 71, and a biasing spring 75. As shown in FIG. 4, the engaging member 61 is formed in a substantially annular shape. The engaging member 61 generally includes a guide part 62, a coupling part 63, and an engaging part 64. The guide part 62 functions to guide the slide of the engaging member 61. The guide portion 62 is formed in a double structure so that the guide peripheral edge 32 protruding from the front end of the front housing 31 is sandwiched between the outside and the inside. The guide peripheral edge 32 is formed in a substantially annular shape. Accordingly, the guide portion 62 also has a double structure of an outer peripheral ring 621 and an inner peripheral ring 622 having a substantially annular shape. The outer peripheral ring 621 and the inner peripheral ring 622 are coupled to each other so as to be folded back by the front folded portion 623. A coupling portion 63 is provided in the vicinity of the rear end edge of the inner circumferential ring 622 of the guide portion 62. The coupling portion 63 is coupled to a coupling portion 73 of a stopper member 71 described below. Specifically, the coupling portion 63 provided on the engagement member 61 has a female shape that fits with the male coupling portion 73 provided on the stopper member 71. Further, the inner peripheral surface of the inner peripheral ring 622 is formed as an engaging portion 64. The engaging portion 64 is formed to be engageable with the outer periphery of the nut member 51 described above. The engagement with the outer periphery of the nut member 51 with which the engaging portion 64 engages enables screw rotation along the rotation axis 40 of the nut member 51 (see FIG. 5 and the like).
As shown in FIG. 6, the rear end 624 of the outer peripheral ring 621 of the engaging member 61 and the front surface 311 of the front housing 31 are brought into contact with each other by the biasing force of the biasing spring 75. Thereby, it can suppress that dust penetrate | invades into the arrangement | positioning range of the biasing spring 75 mounted internally from the outside. Further, a protrusion 625 extending radially inward is provided on the inner peripheral side of the inner peripheral ring 622 of the engaging member 61. Further, the outer peripheral surface of the coupling portion 73 of the stopper member 71 and the inner peripheral surface of the coupling portion 63 of the inner peripheral ring 622 face each other. Here, the projecting portion 625 is disposed so as to close these gaps on the front end sides of the inner and outer peripheral surfaces of the coupling portions 63 and 73 facing each other. Thereby, it is difficult for dust to enter between the inner peripheral surface and the outer peripheral surface of the coupling portions 63 and 73 facing each other.

  The stopper member 71 is also formed in a substantially annular shape. This stopper member 71 generally includes a coupling portion 73 and an outer flange portion 74. The outer flange portion 74 is formed in an outer flange shape capable of sliding contact with the inner peripheral surface of the front housing 31. The outer flange portion 74 is a guide portion that guides sliding in the front-rear direction of the stopper member 71 including the engaging member 61 by sliding contact with the inner peripheral surface of the front housing 31. The outer flange portion 74 is also formed with a structure for holding the biasing spring 75. The coupling portion 73 has a male shape that fits into the coupling portion 63 provided in the above-described engagement member 61. That is, the stopper member 71 is coupled to the engaging member 61 by fitting the coupling portion 73 of the stopper member 71 to the coupling portion 63 of the engaging member 61. Thus, the stopper member 71 is integrated with the engaging member 61 and functions as a part of the engaging member 61. That is, the stopper member 71 constitutes the engaging member side according to the present invention. The outer flange portion 74 is disposed on the rear side of the coupling portion 73 and is formed in an outer flange shape. The rear end of the urging spring 75 serving as the other end of the urging spring 75 contacts the outer flange portion 74. The biasing spring 75 is a coil spring and corresponds to the elastic body according to the present invention. The biasing spring 75 is held by the front housing 31 that holds the output spindle 35 described above. Specifically, the biasing spring 75 is disposed between the front housing 31 guide peripheral edge 32 and the inner peripheral ring 622 of the engaging member 61. The biasing spring 75 is in contact with the inner flange portion 33 whose front end is one end and which is on the front housing 31 side. The inner flange portion 33 is formed so as to protrude from the guide peripheral edge 32 toward the inner peripheral ring 622. The inner flange portion 33 corresponds to a protruding portion according to the present invention. Further, the urging spring 75 abuts the outer flange portion 74 whose rear end that is the other end is on the engagement member 61 side. In this way, the urging spring 75 urges both the engaging member 61 and the stopper member 71 on the engaging member 61 side toward the rear side of the tool body 11. Note that both ends of the urging spring 75 are slidably contacted with the inner flange portion 33 and the outer flange portion 74 with which both ends abut. The urging direction of the urging spring 75 constituting a part of the operation mechanism 60 is set to a direction orthogonal to the urging direction of the urging spring 39 constituting a part of the shaft lock mechanism 37.

By the way, the movement of the engaging member 61 and the stopper member 71 on the engaging member 61 side toward the rear side of the tool body 11 by the urging of the urging spring 75 causes the folded portion 623 of the engaging member 61 to be guided to the periphery of the guide. It is stopped by contacting the front end of 32. That is, the position where the engagement member 61 shown in FIG. 6 is stopped is the retracted position (P1) of the engagement member 61. The engaging member 61 in the retracted position (P1) is disengaged from the outer peripheral surface of the nut member 51 so that the nut member 51 cannot be screwed. On the other hand, as shown in FIG. 7, when the engaging member 61 is moved forward, the engaging portion 64 of the engaging member 61 is engaged with the outer periphery of the nut member 51. It becomes. The outer peripheral surface of the nut member 51 has a hexagonal prism shape.
Thus, when the engaging part 64 is engaged with the outer periphery of the nut member 51, the engaging member 61 is located at the engaging position (P2). Here, the engagement position (P2) is a position relatively moved away from the front housing 31 as compared with the retracted position (P1). Since the engaging member 61 located at the engaging position (P2) is engaged with the nut member 51, the nut member 51 is also integrated by rotating the engaging member 61 along the rotation axis 40. Can be rotated. That is, by rotating the engagement member 61, the nut member 51 can be rotated relative to the tip insertion member 45. Here, the relationship between the retracted position (P1) and the engaged position (P2) of the engaging member 61 is set by being shifted back and forth in the direction along the rotation axis 40 of the nut member 51. Specifically, the engagement position (P2) of the engagement member 61 is a position moved forward along the rotation axis 40 as compared to the retracted position (P1) of the engagement member 61.

  Various configurations can be adopted as the engagement pattern of the engagement member 61 with respect to the nut member 51 described above. FIG. 24 is a front view showing a first example of an engagement pattern of the nut member 51 and the engagement member 61. FIG. 25 is a front view showing a second example of the engagement pattern of the nut member 51 and the engagement member 61. For example, as illustrated and described above, when the outer peripheral surface of the nut member 51 is formed in a hexagonal prism shape as shown in the front view of FIG. The engaging portion 64 of the member 61 may have a 12-corner fitting structure as shown in the front view of FIG. In this case, it is advantageous from the viewpoint of easy fitting. Further, in order to apply this, when the outer peripheral surface of the nut member 51 ′ is a hexagonal convex portion 57 as shown in the front view of FIG. 25A, the engagement member 61 ′ is engaged. The joining portion 64 'may have a 12-corner fitting structure as shown in the front view of FIG. This is also advantageous from the viewpoint of ease of fitting with each other.

  According to the electric tool 10 of the first embodiment described above, the following operational effects can be achieved. That is, according to the electric tool 10 described above, when the engaging member 61 is located at the engaging position (P2), the screw is engaged with the outer peripheral surface of the nut member 51 and is along the rotation axis 40 of the nut member 51. Enable rotation. On the other hand, when the engaging member 61 is located at the retracted position (P1), the nut member 51 is disengaged from the outer peripheral surface and the nut member 51 cannot be screwed. Here, since the urging spring 75 urges the engaging member 61 to the rear side, the urging spring 75 acts to switch the arrangement of the engaging member 61 from the engaging position (P2) to the retracted position (P1). Thereby, at the normal time, the engaging member 61 of the operation mechanism 60 can be positioned at the retracted position (P1). Further, at the time of operation, the bit B can be removed or the bit B can be attached by operating the engaging member 61 to move to the engaging position (P2). That is, the bit B can be replaced without using a dedicated tool such as a spanner. Further, according to the electric tool 10 described above, the retracted position (P1) of the engaging member 61 is set by being shifted from the engaging position (P2) in the direction along the rotation axis 40 of the nut member 51. The position change from the retracted position (P1) to the engaging position (P2) can be easily performed. In addition, since the moving direction of the engaging member 61 coincides with the direction along the rotation axis 40, a simple configuration can be selected. Further, since the retracted position (P1) of the engaging member 61 in the normal state is set on the rear side compared to the engaging position (P2), it is easy to provide a gap with the shoe 17, which is advantageous for processing. Become. Furthermore, according to the electric tool 10 described above, both ends of the biasing spring 75 are slidable with respect to the inner flange portion 33 and the outer flange portion 74 that are in contact with each other. The operated engagement member 61 can be smoothly performed without increasing the number of members.

[Second Embodiment]
Next, a modification regarding the operation mechanism 60 of the first embodiment will be described with reference to FIGS. 14 and 15. FIG. 14 is an internal schematic cross-sectional view schematically showing the operation mechanism 60A of the second embodiment in an enlarged manner. FIG. 15 is an internal schematic cross-sectional view when the operation mechanism 60A of FIG. 14 is operated. The operation mechanism 60A according to the second embodiment is mainly different from the operation mechanism 60 according to the first embodiment in the arrangement of the biasing spring 75A. For this reason, in the description of the second embodiment, “A” is added to the end of the code for the same reference numerals for the parts that perform substantially the same functions as those described in the first embodiment. Is written.
The configurations of the shaft lock mechanism 37A and the bit attachment mechanism 41A shown in FIGS. 14 and 15 are slightly different from the configurations of the shaft lock mechanism 37 and the bit attachment mechanism 41 of the first embodiment described above. Functionally, they function almost the same. That is, the shaft lock mechanism 37A includes the operating body 38A and the urging spring 39A that releases the pressure in the normal state, like the shaft lock mechanism 37 described above. The bit attachment mechanism 41A includes a tip insertion member 45A and a nut member 51A. The tip insertion member 45A is pressed backward by the nut member 51A by further screwing the nut member 51A in the fastening direction with respect to the output spindle 35A. Here, the tip insertion member 45A pressed to the rear side has a reduced inner diameter in accordance with a tapered shape provided on the output spindle 35A. The inner peripheral surface of the tip insertion member 45 presses the outer peripheral surface of the bit B due to the reduced inner peripheral diameter.

  In the operation mechanism 60A according to the second embodiment, the mating relationship with which the biasing spring 75A abuts is opposite to the mating relationship with which the biasing spring 75 according to the first embodiment contacts. Specifically, the urging spring 75A as an elastic body according to the present invention is configured by a coil spring, as in the first embodiment. The biasing spring 75 is held by the front housing 31A that holds the output spindle 35 described above. Specifically, the biasing spring 75A is disposed between the guide end edge 33A of the front housing 31A and the engaging member 61A. The urging spring 75 has a rear end that is one end abutted against a guide end edge 33A that is the front housing 31A side. The guide end edge 33A is configured as a front end edge of the guide peripheral edge 32A. Further, the biasing spring 75A comes into contact with the folded portion 623A whose front end that is the other end is on the engagement member 61A side. In this way, the biasing spring 75A biases the engaging member 61A toward the front side. That is, the urging direction of the engaging member 61A by the urging spring 75A of the second embodiment is set to a direction opposite to the urging direction of the first embodiment described above. Thereby, the front-rear relationship between the retracted position (P1) and the engaged position (P2) of the engaging member 61A is also reversed and reversed in the front-rear direction. Here, the engagement position (P2) is a position relatively moved relative to the front housing 31A as compared with the retracted position (P1). The engaging member 61A is configured to include the function of the stopper member 71 in the first embodiment described above. Specifically, the engaging member 61A is provided with a stopper portion 71A that contacts the step portion 311A of the front housing 31A when the engaging member 61A is located at the retracted position (P1). The engaging member 61A is provided with a stopper portion 72A that comes into contact with the step portion 312A of the front housing 31A when the engaging member 61A is located at the engaging position (P2). Even in the operation mechanism 60A of the second embodiment configured as described above, it is possible to achieve substantially the same operational effects as the operation mechanism 60 of the first embodiment described above.

[Third Embodiment]
Next, the operation mechanism 80 of the above-described third embodiment will be described with reference to FIGS. FIG. 16 is an internal cross-sectional view showing the inside of a tool main body 11B (power tool 10B) according to the third embodiment in an upper and lower halved cross section. FIG. 17 is an enlarged perspective view showing the electric tool 10B in which the engaging member 85 is disengaged in an upper left perspective view. FIG. 18 is an enlarged perspective view showing the electric tool 10B engaged with the engaging member 85 in a lower left perspective view. FIG. 19 is an enlarged perspective view showing the electric power tool 10B engaged with the engaging member 85 in a right upper perspective view. 20 is an external front view of the electric power tool 10B of FIG. FIG. 21 is an internal cross-sectional view illustrating a cross-sectional arrow (XXI)-(XXI) in FIG. 16. FIG. 22 is an internal cross-sectional view showing a cross-sectional arrow (XXII)-(XXII) in FIG. FIG. 23 is an internal cross-sectional view showing the cross-section of the symbol (XXIII)-(XXIII) in FIG. The operation mechanism 60B according to the third embodiment is mainly different from the operation mechanism 60 according to the first embodiment in the configuration regarding the operation mechanism 80. For this reason, in the description of the third embodiment, “B” is added to the end of the code for the same reference numerals for the parts that perform substantially the same functions as those described in the first embodiment. Is written.
In the third embodiment, the operation mechanism 60 of the first embodiment described above is replaced with an operation mechanism 80. Therefore, in the third embodiment, as shown in FIGS. 16 to 23, the configuration of the operation mechanism 60 of the first embodiment described above does not exist, and instead of the third embodiment. An operation mechanism 80 is provided. The operation mechanism 80 also corresponds to the operation member according to the present invention.

  As shown in FIG. 16 to FIG. 23, the operation mechanism includes 80, an outline, a rotation support body 81, a rotation support shaft 84, and an engagement member 85. It is supported by the front housing 31 and is rotatable on the same rotation axis 40 as the screw rotation of the nut member 51. Specifically, the rotary support 81 is configured by screwing a member divided into two into a screw member 82. The rotary support 81 is attached to the front housing 31 described above by screw fastening via the screw member 82. Thus, the rotation support body 81 attached to the front housing 31 can be rotated relative to the front housing 31 on the same rotation axis as the rotation axis 40 described above. An interposed member 83 is disposed between the front end portion of the front housing 31 and the rear side of the nut member 51. The rotation support shaft 84 is provided on the rotation support 81 along the rotation tangent direction of the rotation support 81. The rotation support shaft 84 is supported by a rotation support 81 as shown in FIG. The rotation support shaft 84 supported in this way supports the engagement member 85 so as to be rotatable. For this reason, the engagement member 85 can be switched between the retracted position (P1) and the engaged position (P2) by rotating about the rotation support shaft 84 as a rotation fulcrum. Note that. The engagement position (P2) of the engagement member 85 is engaged with the outer peripheral surface of the nut member 51 so as to enable screw rotation along the rotation axis 40 of the nut member 51, as shown in FIGS. Position. On the other hand, the retracted position (P1) of the engaging member 85 is a position where it is disengaged from the outer peripheral surface of the nut member 51 so that the screwing of the nut member 51 is disabled as shown in FIG. is there.

The outer peripheral surface of the nut member 51 also has a hexagonal prism shape as in the above-described embodiment. The engagement member 85 includes a shaft support portion 86 through which the rotation support shaft 84 is inserted, an extension portion 87 extending so as to straddle the shaft support portions 86, and the rotation of the engagement member 85. And an operation unit 88 protruding in the radial direction. In addition, a spanner portion 89 is provided in the extending portion 87 of the engaging member 85. The spanner portion 89 is formed to have an engaging plane structure that engages with the hexagonal prism shape of the nut member 51 so as to engage with the outer peripheral surface of the nut member 51. The engaging member 85 can be stored in one of the two recessed portions 95 provided in the front housing 31.
Further, a click mechanism 90 is added to the operation mechanism 80 as shown in FIG. The click mechanism 90 includes a roughly spherical ball body 91 and a biasing spring 92 that biases the ball body 91 upward. When the above-described engaging member 85 is positioned at the engaging position (P2), the ball body 91 is fitted at an appropriate position of the engaging member 85 positioned at the engaging position (P2) by the biasing force of the biasing spring 92. Match. On the other hand, the ball body 91 is fitted to the engaging member 85 against the urging force of the urging spring 92 when the engaging member 85 is not located at the engaging position (P2). Is coming off. Whether or not the ball body 91 is fitted due to the difference in position between the case where the engagement member 85 is located at the engagement position (P2) and the case where the engagement member 85 is not located at the engagement position (P2). The presence or absence of such a click is generated. Thus, a person who operates the operation mechanism 80 can easily determine whether or not the engagement member 85 is located at the engagement position (P2) based on the presence or absence of such a click feeling. It has become.

  According to the electric tool 10B including the operation mechanism 80 of the above-described third embodiment, the following operational effects can be achieved. That is, according to the above-described electric tool 10B, the operation mechanism 80 includes the rotation support body 81, the rotation support shaft 84, and the engagement member 85. Therefore, the engagement member with the rotation support shaft 84 as a fulcrum. 85 can be rotated to switch the arrangement from the retracted position (P1) to the engaged position (P2). Here, the engagement member 85 located at the engagement position (P2) can be rotated by the rotation support body 81 on the rotation axis 40 of the screw rotation of the nut member 51. As a result, the screw can be turned along the rotation axis 40 of the nut member 51, and the same effect as the first embodiment described above can be obtained. That is, the tip tool can be replaced without using a dedicated tool such as a spanner. Further, according to the electric power tool 10 </ b> B including the operation mechanism 80, the outer peripheral surface of the nut member 51 has a hexagonal prism shape, and the engagement member 85 is a spanner portion that engages with the prism shape of the nut member 51. 89, the conventional general-purpose product can be used as it is, and it can be made excellent from the viewpoint of productivity such as reducing the manufacturing cost.

In addition, in the electric tool which concerns on this invention, it is not limited to the structure of the electric tool of above-mentioned embodiment, You may be comprised by changing suitably.
That is, in the above-described embodiment, the power tool called a so-called cutout tool (dust-proof boat trimmer) is described as an example. However, the electric tool according to the present invention is not limited to such an example, and any electric tool having a mechanism (attachment mechanism) to which the bit B is attached can have an appropriate configuration used for an appropriate application. It can be employed in power tools.
In the above-described embodiment, the biasing spring 75 of the operation mechanism 60 is configured to be held by the front housing 31 that holds the output spindle 35. However, the holding of the elastic body by the housing according to the present invention is not limited to such an example, and includes all holding by the housing directly or indirectly.

10 Electric tools (rotary electric tools)
DESCRIPTION OF SYMBOLS 11 Tool main body 13 Mounting part 15 Rechargeable battery 17 Shoe 171 Face-to-face part 172 Mounting part 18 Knob screw 20 Drive part 21 Motor housing 211 Inlet 22 Controller 23 Switch 231 Slide switch 25 Brush motor 26 Motor shaft 261 Tip of motor shaft 27, 28 Bearing 29 Fan 30 Output part 31, 31A Front housing 32, 32A Guide peripheral edge 33 Inner flange part (protruding part)
33A Guide edge 34 Screw member 35, 35A Output spindle (output shaft)
351 Rear end fitting hole 352 Front fitting hole 353 Male screw part 36 Blowing opening 37, 37A Shaft lock mechanism 38, 38A Operating body 381 Operating body main body 382 Pressing cover 39, 39A Energizing spring 40 Rotating axis 41, 41A Bit attachment Mechanism (fixing member)
45, 45A Tip insertion member (insertion member)
451 Slit 452 Taper 46 Opening 51, 51A Nut member (fastening member)
512 Reduced-diameter portion 513 Female screw portion 52 Opening portion 60, 60A, 60B Operation mechanism (operation member)
61, 61A Engaging member 62 Guide part 621 Outer ring 622 Inner ring 623, 623A Folding part 63 Coupling part 64 Engaging part 71 Stopper member 71A, 72A Stopper part 73 Coupling part 74 Outer flange part 75, 75A Biasing spring 80 Operation mechanism (operation member)
DESCRIPTION OF SYMBOLS 81 Rotation support body 82 Screw member 83 Interposition member 84 Rotation support shaft 85 Engagement member 86 Axis support part 87 Extension part 88 Operation part 89 Spanner part 90 Click mechanism 91 Ball body 92 Biasing spring B Bit (tip tool)

Claims (8)

An electric tool in which an attachment mechanism for attaching a tip tool is disposed with respect to an output shaft,
The attachment mechanism includes an insertion member into which the tip tool is inserted at a rotation axis of the output shaft at a distal end of the output shaft, a fastening member disposed on an outer periphery of the insertion member, and the fastening with respect to the insertion member An operation mechanism for operating the position of the member,
A male screw part is provided on the outer peripheral surface of the insertion member,
An inner peripheral surface of the fastening member has a female screw portion that is screwed with the male screw portion, and an inner diameter of the insertion member is reduced according to a screwing position of the female screw portion with respect to the male screw portion. A reduced diameter portion that presses the outer peripheral surface of the insertion member inward,
The operating mechanism is configured to engage with an outer peripheral surface of the fastening member so as to enable screw turning along the rotation axis of the fastening member, and to disable the screw turning of the fastening member. An engagement member that can be switched in arrangement is provided at the retracted position that is disengaged from the outer peripheral surface of the fastening member,
The housing that holds the output shaft is configured to hold an elastic body,
The elastic body has one end in contact with the housing side and the other end in contact with the engagement member side so that the arrangement of the engagement member is switched from the engagement position to the retracted position. A power tool characterized by energizing a member. The power tool according to claim 1,
The electric tool according to claim 1, wherein the retracted position of the engaging member is set by being shifted from the engaging position in a direction along a rotation axis of the fastening member. In the electric tool according to claim 1 or claim 2,
At least one of the contact at one end and the contact at the other end of the elastic body is set as a slidable contact. In the electric tool according to claim 2 or claim 3,
The said elastic body is arrange | positioned between the protrusion part provided in the said housing, and this protrusion part and the said engagement member, The electric tool characterized by the above-mentioned. In the electric tool according to any one of claims 1 to 4,
The engagement position of the engagement member is set at a position moved relative to or away from the housing as compared to the retracted position of the engagement member. An electric tool characterized by that. An electric tool in which an attachment mechanism for attaching a tip tool is disposed with respect to an output shaft,
The attachment mechanism includes an insertion member into which the tip tool is inserted at a rotation axis of the output shaft at a distal end of the output shaft, a fastening member disposed on an outer periphery of the insertion member, and the fastening with respect to the insertion member An operation mechanism for operating the position of the member,
A male screw part is provided on the outer peripheral surface of the insertion member,
An inner peripheral surface of the fastening member has a female screw portion that is screwed with the male screw portion, and an inner diameter of the insertion member is reduced according to a screwing position of the female screw portion with respect to the male screw portion. A reduced diameter portion that presses the outer peripheral surface of the insertion member inward,
The operating mechanism is supported by a housing that holds the output shaft and is rotatable about the same rotational axis as the screwdriver, and the rotational support along the rotational tangential direction of the rotational support A pivot support shaft provided on the pivot support shaft, and an engagement member that is pivotally supported by the pivot support shaft and can be switched between an engagement position and a retracted position by rotating,
The engagement position of the engagement member is a position that engages with the outer peripheral surface of the fastening member so as to enable screwing along the rotation axis of the fastening member;
The retractable position of the engaging member is a position that is disengaged from the outer peripheral surface of the fastening member so that the screwing of the fastening member is not possible. In the electric tool according to claim 6,
The outer peripheral surface of the fastening member has a prismatic shape,
The power tool, wherein the engagement member includes a spanner portion that engages with a prismatic shape of the fastening member. An output shaft for rotational driving;
A fixing member provided on the output shaft and fixing the tip tool;
An operating member that can be positioned at a first position where the fixing member can be operated and a second position where the fixing member cannot be operated;
A rotary electric tool comprising:

Images