JP2022071996A - Electric tool - Google Patents

Abstract

To provide improvement relating to a supporting structure of an elastic member in an electric tool equipped with a vibration-isolating structure.SOLUTION: An electric tool is equipped with a motor, a spindle, an inner housing, an outer housing, a pair of interposing members, and a pair of elastic members. The outer housing is formed by vertically coupling an upper member and a lower member separately formed. The pair of interposing members are respectively disposed on the left side and the right side of the inner housing while at least partially abutting on an inner surface of a first member that is one of the upper member and the lower member, and are coupled and fixed to the first member. The pair of elastic members is held between a left side portion and a right side portion of the inner housing and the pair of interposing members, while compressed in a left-and-right direction. Each of a first end portion of the pair of interposing members has at least one first surface extending in a direction approaching the inner housing toward a tip end of the first end portion.SELECTED DRAWING: Figure 12

Description

The present invention relates to a power tool configured to swing and drive a tip tool.

There is known an electric tool (so-called vibration tool) configured to perform a machining operation on a work material by swinging and driving a tip tool mounted on a spindle within a predetermined angle range. Vibration is generated in the vibrating tool as the tip tool swings. Therefore, in order to reduce the vibration transmitted to the grip portion, a vibration tool provided with a vibration-proof structure has been proposed. For example, Patent Document 1 discloses a vibration tool including an outer housing and an inner housing connected via a plurality of elastic members.

Japanese Unexamined Patent Publication No. 2017-144539

The outer housing of the above-mentioned vibration tool is formed by connecting two members divided in the vertical direction. Two elastic members are arranged on the left side and the right side of the inner housing. These elastic members are supported in a state of being compressed in the left-right direction between the intervening member connected in the vertical direction to the outer housing and the inner housing. There is room for further improvement in the support structure of such an elastic member from the viewpoint of assembling.

It is an object of the present invention to provide an improvement regarding a support structure of an elastic member in a power tool provided with a vibration-proof structure.

According to one aspect of the present invention, the motor, the spindle, the inner housing, the outer housing, the pair of intervening members, and the pair of elastic members are provided.

The spindle is configured to swing around a first axis of a detachably mounted tip tool by power from a motor. The first axis defines the vertical direction of the power tool. The inner housing houses at least the motor and spindle. The outer housing houses the inner housing. The outer housing extends along the second axis. The second axis is orthogonal to the first axis and defines the front-back direction of the power tool. The outer housing is formed by connecting the upper member and the lower member, which are formed separately from each other, in the vertical direction.

The pair of intervening members are arranged on the left and right sides of the inner housing, respectively, in a state of at least partially abutting the inner surface of the first member, which is one of the upper member and the lower member, and are connected and fixed to the first member. Has been done. The pair of elastic members are held between the left and right portions of the inner housing and the pair of intervening members, respectively, in a state of being compressed in the left-right direction. Of the upper and lower ends of each of the pair of intervening members, the first end, which is previously inserted into the first member, has at least one first surface. At least one first surface extends toward the inner housing toward the tip of the first end.

The power tool of this embodiment is a so-called vibration tool that swings and drives the tip tool around a first axis extending in the vertical direction. In the vibrating tool, the main vibration occurs in the left-right direction. In order to effectively reduce the left-right vibration transmission from the inner housing to the outer housing, a pair of elastic members are held in a compressed state in the left-right direction between the left and right parts of the inner housing and the outer housing. Need to be done. In this embodiment, since the outer housing is formed by connecting the upper member and the lower member to each other in the vertical direction, a pair of intervening members is adopted to facilitate assembly.

The assembly worker can insert the pair of elastic members into the first member with the inner housing and the pair of intervening members sandwiching the pair of elastic members. At this time, of the pair of intervening members, the first end portion first enters the first member. At least one first surface provided at the first end extends toward the inner housing toward the tip. This reduces the possibility that the intervening member interferes with the open end of the first member at the start of insertion of the intervening member. Further, depending on the insertion, the pair of intervening members can at least partially abut on the inner surface of the first member, and the pair of elastic members can be compressed in the left-right direction. According to this aspect, a pair of left and right elastic members are assembled in a compressed state by using a pair of intervening members to an outer housing and an inner housing having a structure in which the upper member and the lower member are connected to each other in the vertical direction. Becomes easier.

In one aspect of the present disclosure, the pair of intervening members may be configured to engage with the pair of elastic members attached to the inner housing and be held by the elastic force of the pair of elastic members. According to this aspect, the assembling property can be further improved by engaging the pair of intervening members with the pair of elastic members during the assembling work.

In one aspect of the present disclosure, the at least one first surface may include at least one inclined surface that inclines towards the inner housing towards the tip. According to this aspect, the assembling property can be improved by the first surface of the simple structure.

In one aspect of the present disclosure, the at least one inclined surface may include a plurality of inclined surfaces having different inclination angles from each other. In this case, each intervening member can be inserted more smoothly.

In one aspect of the present disclosure, each of the pair of intervening members may have a tubular portion extending in the vertical direction. Each of the pair of intervening members may be connected to the upper member and the lower member via a screw inserted through the tubular portion. According to this aspect, each intervening member, the upper member, and the lower member can be efficiently connected by a screw in a state where each intervening member, the upper member, and the lower member are positioned by the cylindrical portion. can.

In one aspect of the present disclosure, at least one first surface may include a pair of first surfaces arranged on the anterior and posterior sides of the tubular portion. According to this aspect, stable insertion of each intervening member becomes possible.

In one aspect of the present disclosure, each of the pair of intervening members may include at least one second surface that abuts on the inner surface of the first member. At least one second surface may be different from at least one first surface. According to this aspect, by ensuring the dimensional accuracy of at least one second surface of each intervening member, the elastic member can be appropriately supported, so that the intervening member can be easily manufactured.

In one aspect of the present disclosure, the axis of rotation of the output shaft of the motor may extend parallel to the first axis of the spindle. The pair of elastic members may be arranged, at least in part, between the first axis and the second axis in the anteroposterior direction. According to this aspect, the motor and the spindle can be arranged relatively close to each other, and the power tool can be miniaturized. Further, the pair of elastic members can effectively reduce the vibration transmission from the inner housing to the outer housing in the vicinity of the motor and the spindle which are vibration sources.

It is sectional drawing of a vibrating tool. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. It is a perspective view of an inner housing. It is a partially enlarged view of FIG. 1 (however, the tip tool is not shown). It is sectional drawing in the VV line of FIG. 4 (however, the outer housing is not shown). It is a perspective view of a cover member. It is an exploded perspective view of the upper shell and a lever. It is explanatory drawing of the assembly of the lever to the upper shell. It is explanatory drawing of the assembly of the lever to the upper shell. It is a right side view of the switch unit and the switch holder when the switch lever is in the off position (however, a part of the switch holder is not shown). It is a right side view of a switch unit and a switch holder when a switch lever is in an on position. It is sectional drawing in the XII-XII line of FIG. It is sectional drawing in the XIII-XIII line of FIG. It is a perspective view of an intervening member.

Hereinafter, the vibration tool 1 according to the embodiment will be described with reference to the drawings. The vibrating tool 1 is an example of an electric tool that swings and drives the tip tool 91 to perform machining work on a work piece (not shown).

First, a schematic configuration of the vibration tool 1 will be described. As shown in FIGS. 1 and 2, the vibrating tool 1 includes a long housing (also referred to as a tool body) 10. A drive mechanism 5 including a spindle 51 and a motor 4 are housed at one end of the housing 10 in the long axis direction. The spindle 51 is arranged so that the long axis of the spindle 51 (the drive shaft A1 of the tip tool 91) is substantially orthogonal to the long axis of the housing 10. One end of the spindle 51 in the axial direction protrudes from the housing 10 and is exposed to the outside. This one end portion constitutes a tool mounting portion 511 to which the tip tool 91 can be mounted. Further, a battery mounting portion 391 to which the battery 93 can be mounted is provided at the other end of the housing 10 in the long axis direction. The vibrating tool 1 operates using the electric power supplied from the battery 93. The drive mechanism 5 is configured to swing the tip tool 91 mounted on the tool mounting portion 511 within a predetermined angle range around the drive shaft A1 by using the power from the motor 4.

Hereinafter, the detailed configuration of the vibration tool 1 will be described. In the following description, for convenience, the extending direction of the drive shaft A1 is defined as the vertical direction of the vibrating tool 1. In the vertical direction, the tool mounting portion 511 side of the spindle 51 is defined as the lower side of the vibrating tool 1, and the opposite side is defined as the upper side. A direction orthogonal to the drive shaft A1 and substantially corresponding to the long axis direction of the housing 10 is defined as the front-rear direction of the vibration tool 1. In the front-rear direction, the end side of the housing 10 in which the spindle 51 is housed is defined as the front side of the vibrating tool 1, and the end side in which the battery 93 is mounted is defined as the rear side. The direction orthogonal to the vertical direction and the front-back direction is defined as the left-right direction.

First, the configuration of the housing 10 will be described. As shown in FIGS. 1 and 2, the housing 10 of the present embodiment is configured as a so-called anti-vibration housing. Specifically, the housing 10 includes a long outer housing 2 forming an outer shell of the vibration tool 1 and a long inner housing 3 housed in the outer housing 2. The outer housing 2 and the inner housing 3 are elastically connected so as to be relatively movable.

With respect to the front-rear direction, the outer housing 2 includes a front end portion 21, a rear end portion 23, and a central portion 22 connecting the front end portion 21 and the rear end portion 23.

The front end portion 21 is formed in a substantially rectangular box shape. Inside the front end portion 21, the front end portion 31 of the inner housing 3 is arranged. A lever 67 is supported on the upper front end portion of the front end portion 21. In this embodiment, the lever 67 is arranged directly above the spindle 51 and is rotatable around the drive shaft A1. The lever 67 is an operating member for clamping and releasing the tip tool 91 by the clamp mechanism 6 described later. Further, an opening 215 is provided at the rear end portion of the upper wall portion 211 of the front end portion 21. Through the opening 215, the slide-type operation unit 275 is exposed so as to be externally operable. The operation unit 275 is an operation member for switching the switch unit 26 for starting the motor 4 between the on state and the off state.

The rear end portion 23 is formed in a cylindrical shape that expands toward the rear (the cross-sectional area becomes large). Inside the rear end portion 23, an elastic connecting portion 37 and a rear end portion 39 of the inner housing 3 are arranged.

The central portion 22 is formed in a cylindrical shape and extends linearly in the front-rear direction. The central portion 22 is a portion gripped by the user. Therefore, in the following, the central portion 22 is also referred to as a grip portion 22. The grip portion 22 is formed thinner than the front end portion 21 and the rear end portion 23 so that the user can easily grip the grip portion 22. In other words, the outer peripheral length of the cross section of the grip portion 22 is shorter than the outer peripheral length of the cross section of the front end portion 21 and the rear end portion 23.

In the present embodiment, the outer housing 2 is formed by connecting the separately formed upper shell 201 and the lower shell 205 to each other. More specifically, the outer housing 2 is formed by stacking the upper shell 201 and the lower shell 205 in the vertical direction and connecting them with screws at a plurality of places. Both the upper shell 201 and the lower shell 205 are made of synthetic resin.

As shown in FIGS. 1 to 3, the inner housing 3 includes a front end portion 31, an extending portion 35, an elastic connecting portion 37, and a rear end portion 39 in the front-rear direction.

The front end portion 31 is a portion that accommodates the drive mechanism 5 and the motor 4. More specifically, as shown in FIGS. 3 and 4, the front end portion 31 includes a first accommodating portion 311, a second accommodating portion 312, a third accommodating portion 313, and a cover portion 314.

The first accommodating portion 311 is a portion of the drive mechanism 5 that accommodates the spindle 51, a part of the swing member 536 described later, and the clamp mechanism 6. The first accommodating portion 311 is formed in a cylindrical shape extending in the vertical direction. The second accommodating portion 312 is a portion accommodating the motor 4. The second accommodating portion 312 is formed in a cylindrical shape having a larger diameter than the first accommodating portion 311. The second accommodating portion 312 is arranged behind the first accommodating portion 311. Further, the second accommodating portion 312 is shorter in the vertical direction than the first accommodating portion 311 and the lower end of the second accommodating portion 312 is above the lower end of the first accommodating portion 311. The third accommodating portion 313 is a portion of the drive mechanism 5 that accommodates the transmission mechanism 53. The third accommodating portion 313 is arranged on the rear side of the first accommodating portion 311 and on the lower side of the second accommodating portion 312. The third accommodating portion 313 communicates with the first accommodating portion 311 and the second accommodating portion 312. The cover portion 314 is a portion that covers the opening at the upper end of the second accommodating portion 312.

As shown in FIGS. 1 to 3, the extending portion 35 is a portion extending rearward from the rear end of the front end portion 31. Further, the extending portion 35 is a portion corresponding to at least a part of the grip portion 22 of the outer housing 2. "Corresponding to at least a part of the grip portion 22" can be rephrased as "a part or the whole of the extending portion 35 is housed in at least a part of the grip portion 22". In the present embodiment, the length of the extending portion 35 in the front-rear direction is substantially the same as the length of the grip portion 22 in the front-rear direction, and substantially the entire extending portion 35 is arranged in the grip portion 22.

The extending portion 35 includes an outer extending portion 351 forming an outer shell of the extending portion 35 and an inner extending portion 353 arranged in the outer extending portion 351. The outer extending portion 351 is formed in a rectangular tubular shape and extends rearward from the front end portion 31 (more specifically, the rear end portion of the second accommodating portion 312). The medial extension 353 extends posteriorly within the lateral extension 351 from the front end 31 (more specifically, the posterior end of the second accommodating portion 312) to the posterior end of the lateral extension 351. There is. In the present embodiment, the inner extending portion 353 is formed in the shape of a rectangular plate, and is a virtual plane P (which can be said to be a plane including the drive shaft A1 and the rotation shaft A2) passing through the center of the vibration tool 1 in the left-right direction. It extends linearly above (see FIG. 12).

The elastic connecting portion 37 extends rearward from the rear end of the extending portion 35, and is a portion that connects the extending portion 35 and the rear end portion 39 so as to be relatively movable. More specifically, the elastic connecting portion 37 includes a plurality of elastic members 371 that connect the outer extending portion 351 and the rear end portion 39 in the front-rear direction. In the present embodiment, the four elastic members 371 are arranged around the long axis of the inner housing 3 so as to be separated from each other. Each elastic member 371 is configured to be more easily elastically deformed than other parts of the inner housing 3. More specifically, each elastic member 371 is formed in a band shape that is easily elastically deformed (flexible). Further, each elastic member 371 is made of a material having a lower elastic modulus than the other parts of the inner housing 3. The elastic member 371 can effectively suppress the vibration transmission from the front end portion 31 to the rear end portion 39.

The rear end portion 39 is formed in a substantially rectangular box shape. The rear end portion 39 is arranged inside the rear end portion 23 of the outer housing 2.

Further, as shown in FIGS. 1 to 3, the inner housing 3 is formed by connecting the metal housing 301 and the resin housing 305, which are formed as separate bodies from each other.

The metal housing 301 is a single member made of metal. The front portion of the metal housing 301 is configured as an accommodating portion of the drive mechanism 5 and the motor 4, and includes the above-mentioned first accommodating portion 311, a second accommodating portion 312, and a third accommodating portion 313. On the other hand, the rear portion of the metal housing 301 is composed of an inner extending portion 353. That is, the metal housing 301 constitutes a part of the front end portion 31 and a part of the extending portion 35.

On the other hand, the resin housing 305 is formed by connecting the separately formed synthetic resin right shell 306 and the left shell 307 in the left-right direction. The resin housing 305 includes the above-mentioned cover portion 314, an outer extending portion 351 and an elastic connecting portion 37, and a rear end portion 39. That is, the resin housing 305 constitutes a part of the front end portion 31, a part of the extending portion 35, the elastic connecting portion 37, and the rear end portion 39.

The inner housing 3 has the metal housing 301 in a state where the inner extending portion 353 of the metal housing 301 is sandwiched between the right shell 306 and the left shell 307 (specifically, a portion constituting the outer extending portion 351) from the left-right direction. And the right side shell 306 and the left side shell 307 are fixedly connected to each other via screws.

The elastic connection structure between the outer housing 2 and the inner housing 3 will be described in detail later.

Hereinafter, the internal structure of the inner housing 3 will be described.

First, the internal structure of the front end portion 31 will be described. As shown in FIG. 4, the front end portion 31 mainly houses the motor 4, the drive mechanism 5, and the clamp mechanism 6.

The motor 4 is a brushless DC motor, and includes a stator, a rotor arranged radially inside the stator, and an output shaft 413 that rotates integrally with the rotor. The motor 4 is housed in the second housing section 312 so that the rotation shaft A2 of the output shaft 413 extends directly behind the drive shaft A1 in parallel with the drive shaft A1 (that is, in the vertical direction). The output shaft 413 projects downward from the stator. A fan 45 for cooling the motor 4 is fixed to the output shaft 413.

As shown in FIG. 4, the drive mechanism 5 mainly includes a spindle 51 and a transmission mechanism 53.

The spindle 51 is a substantially cylindrical long member. In the present embodiment, the spindle 51 is housed in the lower portion of the first housing section 311. The spindle 51 is rotatably supported around the drive shaft A1 by two bearings (specifically, ball bearings) 513 and 514 held in the first accommodating portion 311. As described above, the lower end of the spindle 51 is configured as a tool mounting portion 511 to which the tip tool 91 (see FIG. 1) can be mounted.

The transmission mechanism 53 is a well-known mechanism configured to transmit the power of the motor 4 (rotational power of the output shaft 413) to the spindle 51 and reciprocate the spindle 51 within a predetermined angle range around the drive shaft A1. Is. The transmission mechanism 53 includes an eccentric shaft 531, a drive bearing 534, and a swing member 536.

The eccentric shaft 531 is a shaft coaxially connected to the output shaft 413 of the motor 4. The eccentric shaft 531 is rotatably supported by bearings held at the lower end of the second accommodating portion 312 and the lower end of the third accommodating portion 313, respectively. The eccentric shaft 531 has an eccentric portion eccentric with respect to the rotation shaft A2. The inner ring of the drive bearing 534 is attached to the eccentric portion.

As shown in FIGS. 4 and 5, the swing member 536 is a member that operably connects the drive bearing 534 and the spindle 51. The rocking member 536 extends over the first accommodating portion 311 and the third accommodating portion 313. The rocking member 536 has a first end portion 537 formed in an annular shape and a bifurcated second end portion 538. The first end portion 537 is fixed to the outer circumference of the spindle 51 between two bearings supporting the spindle 51. The second end portion 538 is arranged so as to abut on the outer peripheral surface of the outer ring of the drive bearing 534 from the left side and the right side. The rocking member 536 has a symmetrical shape with respect to a virtual plane passing through the center in the vertical direction. The vertical thickness of the first end portion 537 is larger than the vertical thickness of the second end portion 538.

When the motor 4 is driven, the swing member 536 is swung within a predetermined angle range about the drive shaft A1 of the spindle 51 in response to the rotation of the eccentric shaft 531 integrally with the output shaft 413. To. The spindle 51 reciprocates within a predetermined angle range around the drive shaft A1 with the swinging motion of the swinging member 536. As a result, the tip tool 91 fixed to the spindle 51 is oscillated around the drive shaft A1 so that the machining work can be performed.

In this embodiment, the inner housing 3 is provided with a configuration for facilitating the assembly of the drive mechanism 5 to the inner housing 3. Specifically, as shown in FIGS. 4 and 5, of the inner housing 3 (specifically, the front end portion 31), the swing member 536 (specifically, the first swing member 536) is located on the front side and the rear side of the swing member 536. A front opening 323 and a rear opening 324 are provided at positions facing the first end 537 and the second end 538), respectively.

The front opening 323 is provided on the front wall portion of the front end portion 31 (first accommodating portion 311). More specifically, the front opening 323 is provided so as to roughly correspond to the region between the upper bearing 513 and the lower bearing 514 in the vertical direction. The front opening 323 is an opening for inserting the swing member 536 into the inner housing 3 when the drive mechanism 5 is assembled. Therefore, the height of the front opening 323 in the vertical direction is set to be at least larger than the maximum thickness of the swing member 536 (thickness of the first end portion 537). Further, the width of the front opening 323 in the left-right direction is set to be at least larger than the maximum width of the swing member 536 (distance between the outer side surfaces of the second end portion 538).

The rear opening 324 is provided on the rear wall portion of the front end portion 31 (third accommodating portion 313). The rear opening 324 is an opening into which an instrument for appropriately positioning the second end portion 538 of the swing member 536 with respect to the drive bearing 534 is inserted when the drive mechanism 5 is assembled. The vertical height of the rear opening 324 is set to be smaller than the vertical height of the front opening 323. Further, the width of the rear opening 324 in the left-right direction is set to be at least larger than the distance between the outer side surfaces of the second end portion 538.

The vertical center position of the front opening 323 is offset upward from the vertical center position of the rear opening 324. This is due to the following reasons. At the time of assembly, the swing member 536 is positioned at a position where the second end portion 538 appropriately abuts on the outer ring of the drive bearing 534 (hereinafter referred to as a mounting position) in the vertical direction and the circumferential direction around the drive shaft A1. There is a need. Further, in the present embodiment, when the swing member 536 is in the mounting position, the first end portion 537 is arranged on the inner ring of the bearing 514 on the lower side of the spindle 51. Due to the need for the first accommodating portion 311 to hold the bearing 514, the front opening 323 cannot be formed in the entire region of the first accommodating portion 311 just in front of the first end portion 537. Therefore, in the present embodiment, the position of the front opening 323 is shifted upward.

In the present embodiment, the spindle 51, the transmission mechanism 53, and the motor 4 are assembled to the inner housing 3 (specifically, the front end portion 31) by the following procedure using the front opening 323 and the rear opening 324.

First, the operator fits the bearing 514 into a predetermined position of the first accommodating portion 311 through the opening at the lower end of the first accommodating portion 311 and fixes it with a retaining ring. After that, the operator inserts the swing member 536 into the first accommodating portion 311 from the front opening 323, further moves the swing member 536 downward, and arranges the swing member 536 at the mounting position. The first end 537 is arranged on the inner ring of the bearing 514. After that, the operator inserts the spindle 51 into the bearing 514 from below, and press-fits the lower end portion of the spindle 51 into the bearing 514 to fix the spindle 51. The operator inserts the instrument through the rear opening 324 and holds the rocking member 536 in the mounting position. The operator inserts the rotor with the fan 45, the eccentric shaft 531 and the drive bearing 534 attached to the output shaft 413 into the front end portion 31 through the opening at the upper end of the second accommodating portion 312. The eccentric shaft 531 is press-fitted into the two bearings to complete the assembly.

As described above, in the present embodiment, the front opening 323 and the rear opening 324 are provided on the front side and the rear side of the rocking member 536. As a result, the swing member 536 can be inserted into the front end portion 31 from the front opening 323 toward the rear. That is, the insertion direction of the swing member 536 can be different from the insertion direction of the spindle 51, the output shaft 413 of the motor 4, and the eccentric shaft 531. When the swing member 536 is inserted into the front end portion 31 from below like the spindle 51, it is necessary to close and fix the lower end portion of the front end portion 31 with another member after assembling the swing member 536. On the other hand, according to the present embodiment, the work of assembling the swing member 536 to the front end portion 31 can be rationalized.

Further, as shown in FIGS. 3 to 5, in the present embodiment, the front end portion 31 is equipped with a cover member 33 for closing the front opening 323 and the rear opening 324.

As shown in FIG. 6, the cover member 33 includes an annular portion 331, a front cover portion 333, and a rear cover portion 334. In the present embodiment, the annular portion 331, the front cover portion 333, and the rear cover portion 334 are integrally formed of the same elastic material (for example, rubber or synthetic resin). That is, the cover member 33 is configured as an annular elastic member as a whole.

The annular portion 331 is a loop-shaped band. The annular portion 331 is formed so as to be mountable on the outer periphery of the lower end portion of the front end portion 31 (specifically, the lower end portion of the first accommodating portion 311 and the third accommodating portion 313) in a slightly pulled state. The front cover portion 333 and the rear cover portion 334 are configured to be fitted to the front opening 323 and the rear opening 324, respectively. The front cover portion 333 and the rear cover portion 334 project inward from the inner peripheral surfaces of the front end portion and the rear end portion of the annular portion 331, respectively. The front cover portion 333 is formed in an arc shape that bulges forward. The rear cover portion 334 is formed in an arc shape that bulges rearward. The height of the portion of the annular portion 331 corresponding to the front cover portion 333 and the rear cover portion 334 in the vertical direction is set to be larger than the height of the front cover portion 333 and the rear cover portion 334.

The operator can easily attach the cover member 33 to the outer periphery of the lower end portion of the front end portion 31 while pulling the cover member 33. As shown in FIGS. 4 and 5, when the cover member 33 is attached to the outer periphery of the lower end portion of the front end portion 31, the annular portion 331 is in close contact with the outer peripheral surface of the lower end portion of the front end portion 31. The front cover portion 333 and the rear cover portion 334 are fitted into the front opening 323 and the rear opening 324, respectively, in a slightly compressed state, and close them. This makes it possible to reduce the possibility of foreign matter (for example, dust) entering the inner housing 3 from the front opening 323 and the rear opening 324. Further, around the front cover portion 333 and the rear cover portion 334, the annular portion 331 is in close contact with the outer peripheral surface of the lower end portion of the front end portion 31. This makes it possible to more effectively reduce the possibility of foreign matter entering.

Further, the front cover portion 333 and the rear cover portion 334 are urged toward the inside of the front end portion 31 (that is, in the direction of closing the front opening 323 and the rear opening 324) by the elastic force of the annular portion 331. There is. This can effectively reduce the possibility that the front cover portion 333 and the rear cover portion 334 will come off from the front opening 323 and the rear opening 324. Further, since the front cover portion 333 and the rear cover portion 334 are each formed in an arc shape, the possibility of interfering with the operation of the swing member 536 is reduced.

Hereinafter, the clamp mechanism 6 will be described.

The clamp mechanism 6 is a mechanism for holding the tip tool 91 fixedly to the tool mounting portion 511 by using the clamp shaft 61 and making the tip tool 91 rotatable integrally with the spindle 51. The configuration of the clamp mechanism 6 of the present embodiment is substantially the same as the configuration of the clamp mechanism disclosed in US Patent Application Publication No. 2020/0282539 (the whole thereof is cited by reference). Therefore, the description here will be omitted.

The clamp mechanism 6 is operably connected to a lever 67 rotatably supported by the front end portion 21 of the outer housing 2. In the present embodiment, as shown in FIGS. 4 and 7, the lever 67 is mainly composed of a main body portion 671, an actuating portion 674, and a torsion coil spring 68.

The main body portion 671 is rotatably supported by the upper wall portion 211 of the front end portion 21 of the outer housing 2 (upper shell 201). The main body portion 671 has an operation portion 672 that is arranged outside the front end portion 21 and is manually operated by the user. The actuating portion 674 is arranged above the clamp mechanism 6 in the front end portion 21, and is fixed to the lower side of the main body portion 671 with a screw 679. The actuating portion 674 has a pair of actuating protrusions 675 for acting on the clamp mechanism 6 to operate the clamp mechanism 6.

The torsion coil spring 68 is arranged around the central portion of the lever 67 in the vertical direction. One end 681 of the torsion coil spring 68 is locked in a locking hole (not shown) formed in the upper wall portion 211 of the upper shell 201. The other end 683 of the torsion coil spring 68 is locked to one of the two locking recesses 676 formed in the actuating portion 674. With such a configuration, the lever 67 is urged by the torsion coil spring 68 toward the initial position where the operating portion 672 abuts on the left wall portion of the upper shell 201. The reason why the two locking recesses 676 are provided is to facilitate the positioning of the operating portion 674 with respect to the main body portion 671.

The clamp mechanism 6 operates in response to the rotation operation of the lever 67. Specifically, the lever 67 operates the clamp mechanism 6 via the actuating protrusion 675 in response to being rotated in a predetermined direction (clockwise when viewed from above) from the initial position, and the tip tool 91. Release the clamp. On the other hand, the lever 67 operates the clamp mechanism 6 via the actuating protrusion 675 in response to being rotated in the direction opposite to that at the time of unlocking from the release position, and clamps the tip tool 91.

In this embodiment, the lever 67 and the upper shell 201 are devised to facilitate the assembly of the lever 67 with respect to the upper shell 201. More specifically, as shown in FIGS. 4, 7 and 8, two protrusions 677 and 678 are provided on both sides of each locking recess 676 of the actuating portion 674 in the circumferential direction. The protrusions 677 and 678 project outward in the radial direction. On the other hand, the upper wall portion 211 of the upper shell 201 is provided with a support hole 212 and a spring accommodating portion 213. The spring accommodating portion 213 is an annular recess provided around the support hole 212. Further, a relief recess 214 that is recessed outward in the radial direction is provided at one position on the outer edge of the spring accommodating portion 213.

Assembling the lever 67 to the upper shell 201 is performed by the following procedure.

First, the operator passes the engaging protrusion 673 protruding from the central portion of the base portion of the main body portion 671 through the support hole 212 of the upper wall portion 211. At this time, the operator positions the main body portion 671 with respect to the upper shell 201 so that the operation portion 672 is arranged at the initial position. The operator arranges the torsion coil spring 68 in the spring accommodating portion 213, and fits the end portion 681 into the locking hole (not shown). After that, the operator positions the operating portion 674 in the circumferential direction with respect to the main body portion 671, and connects and fixes the operating portion 674 to the main body portion 671 so as not to be rotatable by the screw 679.

As shown in FIG. 8, at this stage, the end portion 683 of the torsion coil spring 68 is not engaged with the locking recess 676 and is arranged radially outside the actuating portion 674. After that, the operator rotates the lever 67 counterclockwise (in the direction of the arrow in FIG. 8) when viewed from the side (lower side) of the operating portion 674 around the drive shaft A1 with respect to the upper shell 201. When the lever 67 is rotated to a predetermined position, as shown in FIG. 9, one of the two locking recesses 676, which is closer to the relief recess 214, is arranged at a position facing the relief recess 214.

As shown in FIG. 9, the operator applies a load to the torsion coil spring 68 (while the torsion coil spring 68 is involved and elastically deformed) while the lever 67 is in a predetermined position, and the end portion 683 is moved from the lower side. Look and move it counterclockwise. The end portion 683 reaches the relief recess 214, passes through the protrusion 678 in the relief recess 214, and then moves from the relief recess 214 into the locking recess 676. The elastic force of the torsion coil spring 68 urges the operating portion 674 in the clockwise direction (arrow direction in FIG. 9) when viewed from below. Therefore, the lever 67 rotates in a state where the end portion 683 is locked in the locking recess 676, and is arranged at the initial position.

As described above, in the present embodiment, the operator fixes the main body portion 671 and the operating portion 674 in a positioned state, and then turns the end portion 683 in a state where the lever 67 is rotated by a predetermined amount. Move it. The operator can lock the end portion 683 to the locking recess 676 and urge the torsion coil spring 68 to urge the lever 67 toward the initial position only by this work. Therefore, compared to the method in which the end portion 683 is previously locked to the actuating portion 674, the main body portion 671 and the actuating portion 674 are positioned and fixed with the screw 679 while applying a load to the torsion coil spring 68, the upper shell 201 is provided. Assembling of the lever 67 becomes easy.

Hereinafter, the internal structure of the rear end portion 39 will be described.

As shown in FIGS. 1 and 2, in the present embodiment, the rear portion of the rear end portion 39 is configured as the battery mounting portion 391, and the front portion of the rear end portion 39 is configured as the control unit accommodating portion 392. ing.

The battery mounting portion 391 has an engaging structure capable of slidingly engaging the battery 93, a terminal electrically connectable to the terminal of the battery 93, and the like. Since the battery mounting portion 391 and its structure itself are well known, detailed description thereof will be omitted.

The control unit 395 is housed in the control unit housing unit 392. Although detailed illustration is omitted, the control unit 395 includes a three-phase inverter, a control circuit for controlling the drive of the motor 4 via the three-phase inverter (for example, a microcomputer equipped with a CPU), and a substrate on which these are mounted. Includes a case for accommodating the substrate. The control unit 395 is electrically connected to the battery mounting portion 391, the switch unit 26, the motor 4, etc. via an electric wire (not shown). The control unit 395 is configured to drive the motor 4 while the switch unit 26 is in the ON state.

By making it possible to mount the battery 93 on the rear end 39 of the inner housing 3 and accommodating the control unit 395, the moment of inertia of the inner housing 3 around the drive shaft A1 is increased, and the inner housing 3 is accommodated. Vibration can be reduced.

Hereinafter, the internal structure of the extending portion 35 will be described.

As described above, in the present embodiment, the motor 4 and the drive mechanism 5 are arranged in the front end portion 31, and the control unit 395 and the battery mounting portion 391 are provided in the rear end portion 39. Therefore, although not shown, electric wires and connection terminals for connecting the control unit 395 and the substrate of the motor 4 are arranged in the extending portion 35.

Hereinafter, the internal structure of the elastic connecting portion 37 will be described.

As shown in FIGS. 1 to 3, the switch holder 25 is arranged in the internal space of the elastic connecting portion 37 (the space surrounded in the circumferential direction by the elastic member 371). The switch holder 25 is a member configured to hold the switch unit 26. Although the switch holder 25 is arranged in the internal space of the elastic connecting portion 37, it is fixed to the upper shell 201 and the lower shell 205 and integrated with the outer housing 2. More specifically, as shown in FIG. 2, the switch holder 25 includes a substantially rectangular box-shaped main body 251 and cylindrical portions 254 provided at the left front end portion and the right front end portion of the main body 251 respectively. The cylindrical portion 254 extends in the vertical direction. Although detailed illustration is omitted, the switch holder 25 is fixed to the upper shell 201 and the lower shell 205 by a screw inserted through the cylindrical portion 254.

Hereinafter, the switch unit 26 will be described. As shown in FIG. 10, the switch unit 26 of the present embodiment includes a first switch 261 and a second switch 262. The first switch 261 is a well-known slide switch configured to open and close a circuit using a linearly movable slider. The second switch 262 is a well-known micro switch configured to open and close a circuit with a slight movement by using a snap action mechanism. The second switch 262 is arranged on the right side of the first switch 261 and the plunger 263 of the second switch 262 projects rearward.

As shown in FIG. 1, the switch unit 26 is operably connected to the operation unit 275 via the connecting member 27. The connecting member 27 is a long member extending linearly in the front-rear direction between the upper shell 201 and the extending portion 35 of the inner housing 3. The front end portion of the connecting member 27 is connected to the operating portion 275. The rear end of the connecting member 27 is connected to the switch lever 265.

The switch lever 265 is arranged above the first switch 261 and is supported by a switch holder 25 (partially omitted in FIG. 10) so as to be movable in the front-rear direction. The switch lever 265 moves in the front-rear direction between a predetermined on position and an off position in response to a slide operation in the front-rear direction of the operation unit 275, so that the first switch 261 and the second switch 262 are in the on / off state. Is configured to switch between. More specifically, the switch lever 265 is connected to a slider (not shown) of the first switch 261. Therefore, the slider moves in the front-rear direction integrally with the switch lever 265. Further, the switch lever 265 has a pressing piece 266 arranged on the rear side of the plunger 263 of the second switch 262.

As shown in FIG. 10, when the switch lever 265 is in the off position, the first switch 261 is in the off state. At this time, the pressing piece 266 is located at a position rearwardly separated from the plunger 263, and the second switch 262 is also in the off state. On the other hand, as shown in FIG. 11, when the switch lever 265 is in the on position, the first switch 261 is in the on state. At this time, the pressing piece 266 is in a position to press the plunger 263, and the second switch 262 is also in the ON state.

In the present embodiment, when both the first switch 261 and the second switch 262 are in the on state, the switch unit 26 is in the on state. When at least one of the first switch 261 and the second switch 262 is in the off state, the switch unit 26 is in the off state. As described above, the on / off state of the switch unit 26 is used for driving control of the motor 4 by the control unit 395.

Since the second switch 262 is a micro switch, the switch is caused by the dimensional error of the second switch 262 and / or the switch holder 25, the assembly error, and the fact that the plunger 263 is urged rearward. There is a possibility that the on state is switched to the off state depending on the slight movement of the lever 265. That is, the on / off state of the switch unit 26 may become unstable. Therefore, in the present embodiment, the switch holder 25 is provided with a leaf spring 258 for stably holding the switch lever 265 in the on position.

The leaf spring 258 is arranged below the pressing piece 266 and has a protruding portion 259 that projects upward. In the process of moving the switch lever 265 forward from the off position shown in FIG. 10, the protrusion 259 is pressed against the lower end of the pressing piece 266, and the leaf spring 258 bends downward to move the pressing piece 266 forward. Tolerate. As shown in FIG. 11, when the pressing piece 266 passes through the protrusion 259 and the switch lever 265 reaches the on position, the leaf spring 258 returns upward. The leaf spring 258 urges the pressing piece 266 forward in a state where the protruding portion 259 abuts on the lower end portion of the pressing piece 266 from the rear, and stably holds the switch lever 265 in the on position. Similarly, when the switch lever 265 moves from the on position to the off position, the leaf spring 258 bends downward to allow the pressing piece 266 to move backward, and when the pressing piece 266 passes through the protrusion 259, it moves upward. Return.

Hereinafter, the elastic connection structure between the outer housing 2 and the inner housing 3 will be described. In the present embodiment, the outer housing 2 and the inner housing 3 are elastically connected at a plurality of points. Specifically, a plurality of elastic members are interposed between the front end portion 21 and the front end portion 31, and between the switch holder 25 and the rear end portion 39, respectively.

First, the elastic connection structure between the front end portion 21 and the front end portion 31 will be described.

As shown in FIGS. 12 and 13, recesses 317 having a circular cross section are provided on the left side portion and the right side portion of the first accommodating portion 311 of the front end portion 31, respectively. The left and right recesses 317 have the same configuration and are arranged symmetrically with respect to the plane P. A cylindrical front elastic member 71 is fitted in each recess 317 in a state of being slightly compressed in the radial direction. In this embodiment, the front elastic member 71 is made of a urethane resin having an ultrafine foam structure.

In the present embodiment, the pair of left and right front elastic members 71 are pressed against the front end portion 31 by the pair of left and right intervening members 28, respectively, and are held in a state of being compressed in the left-right direction. The left and right intervening members 28 are fixed to the outer housing 2 on the left and right sides of the front end portion 31 in a state of partially abutting the inner surface of the outer housing 2, respectively. More specifically, each intervening member 28 is fixed to the upper shell 201 and the lower shell 205. The left and right intervening members 28 have the same configuration and are arranged symmetrically with respect to the plane P.

Hereinafter, the detailed configuration of the intervening member 28 will be described. As shown in FIGS. 12 to 14, the intervening member 28 includes a first portion 281 that engages the front elastic member 71 and a second portion 282 that engages the outer housing 2. The first portion 281 and the second portion 282 are integrally formed of a synthetic resin.

The first portion 281 is substantially orthogonal to the plate surface of the disc portion from the disc portion arranged so as to intersect (specifically, substantially orthogonal to) a straight line extending in the left-right direction and the central portion of the disc portion. Includes protrusions that project in the direction (substantially left-right direction). The protrusion of the first portion 281 has an outer diameter slightly larger than the inner diameter of the front elastic member 71. The protrusion is fitted in the central portion of the front elastic member 71 and is covered with the front elastic member 71 over the entire circumference. The tip of the protrusion is separated from the bottom surface of the recess 317. The disk portion is in contact with one end surface (the surface on the outer housing 2 side) of the front elastic member 71 around the protrusion. That is, the disk portion has an annular pressing surface 281A. The protrusion of the first portion 281 is relatively movable in the recess 317 while compressing the front elastic member 71 in any of the vertical direction, the front-back direction, and the left-right direction.

The second portion 282 includes a tubular portion 283, a pair of extending portions 284, and a pair of abutting portions 286.

The tubular portion 283 is arranged on the side opposite to the protrusion (outer housing 2 side) with respect to the disc portion of the first portion 281 and extends in the vertical direction from substantially the center of the disc portion to the upper end of the disc portion. ing. The tubular portion 283 is sandwiched between the cylindrical portion provided in the upper shell 201 and the cylindrical portion provided in the lower shell 205 from above and below, and is fastened to the screw hole of the cylindrical portion of the lower shell 205. Is connected to the upper shell 201 and the lower shell 205. As a result, the intervening member 28 is connected to the outer housing 2 in a positioned state.

The pair of extending portions 284 extend vertically on both sides (front side and rear side) of the tubular portion 283, adjacent to the tubular portion 283. The front and rear extending portions 284 have a shape symmetrical with respect to the tubular portion 283. The extending portion 284 is longer than the diameter of the disk portion of the first portion 281, and the extending portion 284 projects radially outward from the upper end and the lower end of the disk portion. That is, the upper end and the lower end of the extending portion 284 define the upper end and the lower end of the intervening member 28.

Of the outer surface of the lower end portion 285 of each extending portion 284, the surface facing the outer housing 2 is inclined toward the inner housing 3 (plane P, first portion 281) toward the lower end. In this embodiment, this surface is inclined in two stages. More specifically, this surface includes a first inclined surface 285A and a second inclined surface 285B connected to the underside of the first inclined surface 285A. The inclination angle of the second inclined surface 285B (the angle formed by the plane P and the second inclined surface 285B) is larger than the inclination angle of the first inclined surface 285A (the angle formed by the plane P and the first inclined surface 285A). Although the details will be described later, the first inclined surface 285A and the second inclined surface 285B are provided to facilitate the assembly of the intervening member 28 to the outer housing 2.

The pair of abutting portions 286 project forward and backward, respectively, from the pair of extending portions 284. The contact portion 286 is provided above the lower end of the extending portion 284. Further, the lower end of the contact portion 286 is below the upper end of the lower end portion 285 (specifically, between the upper end and the lower end of the first inclined surface 285A). The abutting portion 286 has an abutting surface 286A that abuts on the inner surface of the outer housing 2 (the right surface of the left wall portion of the outer housing 2 or the left surface of the right wall portion). The contact surface 286A is a surface (specifically, a surface substantially orthogonal to each other) that intersects a straight line extending in the left-right direction. Further, the contact surface 286A is substantially parallel to the pressing surface 281A of the first portion 281. Further, the contact surface 286A and the pressing surface 281A are partially overlapped in the left-right direction (that is, a part of the contact surface 286A and a part of the pressing surface 281A are on the same straight line extending in the left-right direction. It is in).

Hereinafter, the assembly of the front elastic member 71 and the intervening member 28 to the housing 10 will be described.

First, the operator fits the front elastic member 71 into the left and right recesses 317 of the front end portion 31 of the inner housing 3, respectively. Subsequently, the operator fits the protrusion of the first portion 281 of the intervening member 28 into the front elastic member 71. The intervening member 28 is held by the elastic force of the front elastic member 71, and is tentatively connected to the inner housing 3 via the front elastic member 71 (see FIG. 3). Therefore, the operator can integrally handle the inner housing 3, the front elastic member 71, and the intervening member 28.

The operator accommodates the inner housing 3 in this state in the lower shell 205 placed on the workbench so as to open upward. A recess 206 having a shape substantially corresponding to the cylindrical portion 283 and the pair of extending portions 284 is provided on the left wall portion and the upper portion of the right wall portion of the lower shell 205, respectively. The operator aligns the cylindrical portion 283 and the pair of extending portions 284 with the recess 206 and moves the inner housing 3 downward with respect to the lower shell 205.

Of the intervening members 28, the one that first enters the lower shell 205 is the lower end of the pair of extending portions 284, that is, the lower end of the portion provided with the second inclined surface 285B. Therefore, when the intervening member 28 enters the lower shell 205, the possibility that the lower end of the intervening member 28 interferes with the upper end of the lower shell 205 is reduced. The operator can easily insert the lower end portion 285 into the lower shell 205 (specifically, the recess 206). Following the portion of the lower end portion 285 provided with the second inclined surface 285B, the portion provided with the first inclined surface 285A also smoothly enters the lower shell 205 (recessed portion 206).

When the operator further moves the inner housing 3 downward with respect to the lower shell 205, the contact surface 286A of the contact portion 286 becomes a pair of inner surfaces of the lower shell 205 (specifically, a pair defining the recess 206). Abuts on the protruding end face of the rib 207). In this state, when the operator further moves the inner housing 3 downward with respect to the lower shell 205, the front elastic member 71 is pressed toward the inner housing 3 and is compressed in the left-right direction. When the lower end of the tubular portion 283 substantially reaches the position where it abuts on the upper end of the cylindrical portion of the lower shell 205, the work of accommodating the inner housing 3 with respect to the lower shell 205 is completed. The operator places the upper shell 201 above the lower shell 205 and fastens the screws 29. This completes the assembly of the front elastic member 71 and the intervening member 28 to the housing 10.

As described above, according to the intervening member 28 having the lower end portion 285 having the first inclined surface 285A and the second inclined surface 285B, the front elastic member 71 is provided with respect to the inner housing 3 and the lower shell 205. It is possible to facilitate the work of inserting while compressing in the left-right direction.

Further, in a state where the intervening member 28 is assembled to the inner housing 3 and the lower shell 205, the contact surface 286A different from the first inclined surface 285A and the second inclined surface 285B is the inner surface of the lower shell 205 (in detail). Is configured to abut on the protruding end faces of the pair of ribs 207 that define the recess 206). Therefore, by ensuring the dimensional accuracy of the contact surface 286A and the rib 207 of the outer housing 2, the front elastic member 71 can be appropriately supported, and the intervening member 28 can be easily manufactured. In the present embodiment, when the intervening member 28 is assembled to the inner housing 3 and the lower shell 205, the first inclined surface 285A and the second inclined surface 285B define the inner surface (recessed portion 206) of the lower shell 205. Although it does not substantially abut on the surface), it may abut.

Hereinafter, the elastic connection structure between the switch holder 25 and the rear end portion 39 will be described.

As shown in FIG. 2, the left wall portion and the right wall portion of the main body 251 of the switch holder 25 are each provided with recesses 252 that are recessed inward (plane P). The left and right recesses 252 have the same configuration and are arranged symmetrically with respect to the plane P. A rear elastic member 73 is fitted in the recess 252. Like the front elastic member 71, the posterior elastic member 73 is made of a urethane resin having an ultrafine foam structure.

On the other hand, a pair of arm portions 393 project forward from the left wall portion and the right wall portion of the rear end portion 39 (control unit accommodating portion 392) of the inner housing 3. The tip of each arm portion 393 is provided with a protrusion protruding inward (plane P). The tip of the arm portion 393 comes into contact with the outer surface of the rear elastic member 73, and the protrusion is fitted into a recess provided in the rear elastic member 73 and is covered with the rear elastic member 73 over the entire circumference. There is. The tip of the protrusion of the arm portion 393 is separated from the bottom of the recess 252. With such a configuration, the tip portion of the arm portion 393 can move relatively in the recess 252 while compressing the rear elastic member 73 in any of the vertical direction, the front-back direction, and the left-right direction.

As described above, in the present embodiment, the outer housing 2 and the inner housing 3 are connected to each other via the front elastic member 71 and the rear elastic member 73 so as to be relatively movable in all directions. With such a configuration, it is possible to effectively reduce the vibration transmission from the inner housing 3 to the outer housing 2 when the tip tool 91 is driven to swing.

Further, in the present embodiment, as shown in FIGS. 1 to 3, the rear end portion 39 of the inner housing 3 and the rear end portion 23 of the outer housing 2 are restricted from moving the inner housing 3 with respect to the outer housing 2. A regulation unit 8 for this purpose is provided. In the present embodiment, the regulation unit 8 includes four regulation units of an upper regulation unit 81, a lower regulation unit 82, a left side regulation unit 83, and a right side regulation unit 84. Each of the upper restricting portion 81, the lower regulating portion 82, the left side regulating portion 83 and the right side regulating portion 84 includes a pair of abutting portions (specifically, recesses and protrusions) capable of abutting against each other.

The upper restricting portion 81 includes a recess 811 provided on the upper wall portion of the rear end portion 23 and a protruding portion 815 provided on the upper wall portion of the rear end portion 39. The recess 811 is recessed upward from the lower surface of the upper wall portion of the rear end portion 23. Further, the recess 811 is formed as a groove extending in the left-right direction from substantially the left end to the right end of the upper wall portion of the rear end portion 23. The recess 811 has a substantially rectangular cross section and is defined by a front surface, a rear surface, and an upper surface. The protrusion 815 is a long protrusion that protrudes upward from the upper surface of the upper wall portion of the rear end portion 39 and extends in the left-right direction. The protrusion 815 is provided at the center of the upper wall portion of the rear end portion 39 in the left-right direction. The protrusion 815 has a substantially rectangular cross section, and has a front surface, a rear surface, and an upper surface.

The protrusion 815 is arranged in the recess 811. A gap is provided between the tip of the protrusion 815 and the bottom surface (upper surface) of the recess 811. Further, the width of the recess 811 in the front-rear direction is set to be larger than the width of the protrusion 815 in the front-rear direction, and in the initial state where the outer housing 2 and the inner housing 3 do not move relative to each other, the front side of the protrusion 815. And there is a gap on the back side. On the other hand, when the rear end portion 23 and the rear end portion 39 move relative to each other, a part of the protruding portion 815 comes into contact with the surface defining the recess 811, so that the rear end portion 23 and the rear end portion 39 can be moved relative to each other. The range is limited. More specifically, the gap between the front surface of the protrusion 815 and the front surface of the recess 811 defines a range in which the upper end portion of the rear end portion 39 can move forward with respect to the upper end portion of the rear end portion 23. The gap between the rear surface of the protrusion 815 and the rear surface of the recess 811 defines a range in which the upper end portion of the rear end portion 39 can move rearward with respect to the upper end portion of the rear end portion 23.

A left-right gap between the tip of the protrusion 815 and the bottom surface of the recess 811, a gap between the front surface of the protrusion 815 and the front surface of the recess 811, and a gap between the rear surface of the protrusion 815 and the rear surface of the recess 811. The gap between the two is smaller than the gap between the outer surface of the other portion of the inner housing 3 (that is, the front end portion 31, the extending portion 35, the elastic connecting portion 37) and the inner surface of the outer housing 2. Further, all of these gaps are set so that the inner housing 3 does not come into contact with the outer housing 2 even if the inner housing 3 vibrates during the swing drive of the tip tool 91.

The lower regulating portion 82 includes a recess 821 provided on the lower wall portion of the rear end portion 23 and a protruding portion 825 provided on the lower wall portion of the rear end portion 39. The recess 821 is recessed downward from the upper surface of the lower wall portion of the rear end portion 23. Further, the recess 821 is formed as a groove extending in the left-right direction from the substantially left end to the right end of the lower wall portion of the rear end portion 23. The recess 821 has a substantially rectangular cross section and is defined by a front surface, a rear surface, and a bottom surface. The protrusion 825 is a long protrusion that protrudes downward from the lower surface of the lower wall portion of the rear end portion 39 and extends in the left-right direction. The protrusion 825 is provided at the center of the lower wall portion of the rear end portion 39 in the left-right direction. The protrusion 825 has a substantially rectangular cross section, and has a front surface, a rear surface, and a lower surface. In the present embodiment, the lower regulation unit 82 is arranged at a position different from that of the upper regulation unit 81 (specifically, behind the upper regulation unit 81), but is omitted from the upper regulation unit 81 in the front-rear direction. They may be arranged in the same position.

The protrusion 825 is arranged in the recess 821. A gap is provided between the tip of the protrusion 825 and the bottom surface (lower surface) of the recess 821. The width of the recess 821 in the front-rear direction is set to be larger than the width of the protrusion 825 in the front-rear direction, and in the initial state, there is a gap between the front side and the rear side of the protrusion 825. Similar to the upper regulation portion 81, the protrusion 825 and the recess 821 contact each other to limit the relative movable range of the rear end portion 23 and the rear end portion 39. The setting of the gap between the protrusion 825 and the recess 821 is the same as the setting of the upper regulation portion 81.

The left side regulating portion 83 includes a recess 831 provided on the left wall portion of the rear end portion 23 and a protruding portion 835 provided on the left wall portion of the rear end portion 39. The recess 831 is recessed to the left from the right surface of the left wall portion of the rear end portion 23. Further, the recess 831 is formed as a groove extending in the vertical direction from substantially the upper end to the lower end of the left wall portion of the rear end portion 23. The recess 831 has a substantially rectangular cross section and is defined by a front surface, a rear surface, and a left surface. The protrusion 835 is a long protrusion that protrudes to the left from the left surface of the left wall portion of the rear end portion 39 and extends in the vertical direction. The protrusion 835 is provided at the center of the left wall portion of the rear end portion 39 in the vertical direction. The protrusion 835 has a substantially rectangular cross section, and has a front surface, a rear surface, and a left surface.

The protrusion 835 is arranged in the recess 831. A gap is provided between the tip of the protrusion 835 and the bottom surface (left surface) of the recess 831. The width of the recess 831 in the front-rear direction is set to be larger than the width of the protrusion 835 in the front-rear direction, and in the initial state, there is a gap between the front side and the rear side of the protrusion 835. Similar to the upper regulation portion 81, the protrusion 835 and the recess 831 abut against each other to limit the relative movable range of the rear end portion 23 and the rear end portion 39. The setting of the gap between the protrusion 835 and the recess 831 is the same as the setting of the upper regulation portion 81.

The right side regulating portion 84 includes a recess 841 provided on the right wall portion of the rear end portion 23 and a protruding portion 845 provided on the right wall portion of the rear end portion 39. The recess 841 is recessed to the right from the left surface of the right wall portion of the rear end portion 23. Further, the recess 841 is formed as a groove extending in the vertical direction from substantially the upper end to the lower end of the right wall portion of the rear end portion 23. The recess 841 has a substantially rectangular cross section and is defined by a front surface, a rear surface, and a right surface. The protrusion 845 is a long protrusion extending to the right from the right surface of the right wall portion of the rear end portion 39 and extending in the vertical direction. The protrusion 845 is provided at the center of the right wall portion of the rear end portion 39 in the vertical direction. The protrusion 845 has a substantially rectangular cross section, and has a front surface, a rear surface, and a right surface. In the present embodiment, the right side regulation unit 84 is arranged at substantially the same position as the left side regulation unit 83 in the front-rear direction, but may be arranged at a different position in the front-rear direction from the left side regulation unit 83.

The protrusion 845 is arranged in the recess 841. A gap is provided between the tip of the protrusion 845 and the bottom surface (right surface) of the recess 841. The width of the recess 841 in the front-rear direction is set to be larger than the width of the protrusion 845 in the front-rear direction, and in the initial state, there is a gap between the front side and the rear side of the protrusion 845. Similar to the upper regulation portion 81, the protrusion 845 and the recess 841 abut against each other to limit the relative movable range of the rear end portion 23 and the rear end portion 39. The setting of the gap between the protrusion 845 and the recess 841 is the same as the setting of the upper regulation portion 81.

Due to the regulating portion 8 having the above configuration, the movable range of the rear end portion 39 of the inner housing 3 with respect to the outer housing 2 is the other portion where the regulating portion is not provided (that is, the front end portion 31, the extending portion). 35, it is limited as compared with the elastic connecting portion 37). When the vibrating tool 1 is dropped, a part of the protruding portion in at least one of the upper regulating portion 81, the lower regulating portion 82, the left regulating portion 83, and the right regulating portion 84 comes into contact with the surface defining the recess. The movement of the inner housing 3 with respect to the outer housing 2 is restricted. This makes it possible to reduce the possibility that the inner housing 3 will move significantly with respect to the outer housing 2 due to inertia.

In particular, in the present embodiment, the upper regulation unit 81, the lower regulation unit 82, the left side regulation unit 83, and the right side regulation unit 84 are provided at four locations in the circumferential direction of the outer housing 2 and the inner housing 3. Therefore, the movement of the inner housing 3 with respect to the outer housing 2 can be more reliably regulated as compared with the case where the regulating portion is provided at only one place in the circumferential direction.

In the vibration tool 1, the spindle 51 that swings and drives the tip tool 91 is the main vibration source. Since the rear end portion 39 is the farthest from the drive shaft A1 of the inner housing 3, the vibration of the rear end portion 39 is caused by other portions (that is, the front end portion 31, the extending portion 35, and the elasticity) that are closer to the drive shaft A1. It tends to be larger than the vibration of the connecting portion 37). Therefore, it is rational to restrict the movement of the inner housing 3 with respect to the outer housing 2 at the rear end portion 39. In this embodiment, the elastic connecting portion 37 effectively reduces the vibration transmission from the extending portion 35 to the rear end portion 39. Therefore, the vibration in the rear end portion 39 is smaller than that in the case where the elastic connecting portion 37 is not provided, but even in such a case, it is rational to provide the restricting portion 8 in the rear end portion 39 and the rear end portion 23. It is a target. As described above, in the present embodiment, the regulating unit 8 avoids the possibility of hindering the relative movement of the inner housing 3 with respect to the outer housing 2 when the tip tool 91 is oscillated, and the inner when the vibrating tool 1 is dropped. A vibration-proof structure that can reduce the impact on the housing 3 is realized.

The elastic member 371 of the elastic connecting portion 37 is more likely to be damaged when an impact is applied in the front-rear direction as compared with other parts of the inner housing 3. On the other hand, since the restricting portion 8 is configured to restrict the movement of the inner housing 3 in the front-rear direction with respect to the outer housing 2, it is suitable when the vibrating tool 1 falls from the rear end portion 39 or the front end portion 31. Therefore, the possibility of damage to the elastic member 371 can be reduced.

Further, the upper regulation unit 81, the lower regulation unit 82, the left side regulation unit 83, and the right side regulation unit 84 are all composed of a recess and a protrusion arranged in the recess. Therefore, when a part of the protruding portion abuts on the surface defining the concave portion, it is possible to restrict the rotation of the inner housing 3 in addition to the linear movement forward and backward with respect to the outer housing 2.

The correspondence between each component of the above embodiment and each component of the present disclosure or the present invention is shown below. However, each component of the embodiment is merely an example, and does not limit each component of the present invention.

The vibration tool 1 is an example of a “power tool”. The motor 4 is an example of a "motor". The spindle 51 is an example of a “spindle”. The tip tool 91 is an example of a “tip tool”. The inner housing 3 is an example of an “inner housing”. The outer housing 3, the upper shell 201, and the lower shell 205 are examples of the “outer housing”, the “upper member”, and the “lower member”, respectively. The lower shell 205 is an example of a "first member". The intervening member 28 is an example of the “intervening member”. The front elastic member 71 is an example of an “elastic member”. The lower end portion (lower end portion 285) of the intervening member 28 is an example of the “first end portion”. Each of the first inclined surface 285A and the second inclined surface 285B is an example of the "first surface" and the "inclined surface". The tubular portion 283 is an example of a “cylindrical portion”. The contact surface 286A is an example of the "second surface".

The above embodiment is merely an example, and the power tool according to the present invention is not limited to the illustrated vibration tool 1. For example, the changes exemplified below can be made. It should be noted that at least one of these changes may be adopted in combination with the vibration tool 1 shown in the embodiment and at least one of the features described in the claims.

For example, the following modifications can be made to the elastic connection structure between the front end portion 21 of the outer housing 2 and the front end portion 31 of the inner housing 3.

The shape, material, number, and the like of the front elastic member 71 may be different from the examples of the above-described embodiment. For example, the front elastic member 71 may be a cylindrical body or a medium body, and may have a cross-sectional shape other than a circular shape. Further, the front elastic member 71 may be made of, for example, a synthetic resin, rubber, or a spring element different from the above-mentioned example. In the above embodiment, a pair of left and right front elastic members 71 are provided, but a plurality of pairs of front elastic members 71 are separated from each other in the front-rear direction and / or the up-down direction between the front end portion 21 and the front end portion 31. It may be arranged.

The shape, arrangement, number, and the like of the intervening members 28 may be different from the examples of the above-described embodiment. For example, the shape of the first portion 281 can be appropriately changed with the change of the front elastic member 71 described above. Each of the intervening members 28 may support a plurality of front elastic members 71. There may be only one extending portion 284 and abutting portion 286 of the second portion 282. A contact surface 286A may be provided on the upper portion of the extending portion 284. The intervening member 28 may be arranged between the left side portion and the right side portion of the portion other than the front end portion 31 (for example, the rear end portion 39) and the rear end portion 23, and may support the elastic member.

Further, for example, the intervening member 28 may be inserted into the upper shell 201 and fixed to the upper shell 201 and the lower shell 205 in a state of being at least partially in contact with the inner surface of the upper shell 201. In this case, the upper end portion of the intervening member 28 (for example, the upper end portion of each of the pair of extending portions 284) may be provided with an inclined surface similar to the first inclined surface 285A and the second inclined surface 285. That is, at the time of assembly, the inclined surface may be provided at the end portion of the upper end portion and the lower end portion of the intervening member 28, which is first inserted into one of the upper shell 201 and the lower shell 205. Alternatively, the intervening member 28 may have a vertically symmetrical shape, and inclined surfaces may be provided on both the upper end portion and the lower end portion. Further, the intervening member 28 may be connected and fixed only to one of the upper shell 201 and the lower shell 205 into which the intervening member 28 is inserted.

Further, the inclined surface does not need to include the first inclined surface 285A and the second inclined surface 285 having different inclination angles, and may be a single inclined surface inclined at a constant angle. Alternatively, instead of the inclined surface, a curved surface extending toward the inner housing 3 toward the tip of the upper end portion or the lower end portion may be adopted. Further, the inclined surface (planar surface) and the curved surface may be connected in the vertical direction.

Similarly, the elastic connection structure (shape, material, arrangement, etc. of the rear elastic member 73) between the rear end portion 23 of the outer housing 2 and the rear end portion 39 of the inner housing 3 can be appropriately changed.

The shape and the like of the outer housing 2 can be appropriately changed as long as it is formed by connecting the upper shell 201 and the lower shell 205. For example, the switch holder 25 does not necessarily have to be connected to the outer housing 2. Further, the shapes and components of the metal housing 301 and the resin housing 305 constituting the inner housing 3, and the connection mode of the metal housing 301 and the resin housing 305 can be appropriately changed. For example, the elastic connecting portion 37 of the inner housing 3 may be omitted, and the extending portion 35 and the rear end portion 39 may be directly connected.

At least one of the upper regulation unit 81, the lower regulation unit 82, the left side regulation unit 83, and the right side regulation unit 84 may be omitted. Alternatively, one restricting portion extending over the entire circumference of the rear end portion 39 and the rear end portion 23 may be provided. In addition, the arrangement of the regulation unit 8 may be changed. For example, in the inner housing 3 that does not have the elastic connecting portion 37, even if the restricting portion 8 is provided at the rear end portion of the extending portion 35 (that is, the portion of the extending portion 35 that is farthest from the drive shaft A1). good. The configurations of the upper regulation unit 81, the lower regulation unit 82, the left side regulation unit 83, and the right side regulation unit 84 can be changed as appropriate, such as reversing the arrangement relationship between the recess and the protrusion.

The configuration of the internal mechanism including the motor 4, the drive mechanism 5, the clamp mechanism 6, and the control unit 395, the configuration of the members supported by the outer housing 2 (for example, the lever 67, the connecting member 27), the arrangement thereof, and the like. , Can be changed as appropriate. For example, the motor 4 may be an AC motor or a motor having a brush. Further, the motor 4 may be arranged in the grip portion 22 so that the rotation axis A2 of the output shaft 413 is orthogonal to the drive axis A1.

Further, in view of the present invention, the above-described embodiment, and the embodiments thereof, the following aspects are constructed. At least one of the following embodiments may be employed alone or in combination with at least one of the vibration tool 1 of the embodiment, the modification, and the features described in the claims.
[Aspect 1]
A pair of recesses extending in the vertical direction are formed inside the left side portion and the right side portion of the first member, respectively.
Each of the pair of intervening members is configured to fit into the pair of recesses from below or above.
[Aspect 2]
The at least one second surface is at least partially different from the at least one first surface in the vertical direction.
[Aspect 3]
The at least one second surface is located above the lower end of the at least one first surface in the vertical direction.

1: Vibration tool, 10: Housing, 2: Outer housing, 201: Upper shell, 205: Lower shell, 206: Recess, 207: Rib, 21: Front end, 211: Upper wall, 212: Support hole, 213 : Spring accommodating part, 214: Relief concave part, 215: Opening, 22: Central part (grip part), 23: Rear end part, 25: Switch holder, 251: Main body, 252: Recessed part, 254: Cylindrical part, 258: Plate Spring, 259: projecting part, 26: switch unit, 261: 1st switch, 262: 2nd switch, 263: plunger, 265: switch lever, 266: pressing piece, 27: connecting member, 275: operating part, 28: Intervening member, 281: 1st part, 281A: Pressing surface, 282: 2nd part, 283: Cylindrical part, 284: Extension part, 285: Lower end part, 285A: 1st inclined surface, 285B: 2nd inclined surface , 286: Contact part, 286A: Contact surface, 29: Screw 3: Inner housing, 301: Metal housing, 305: Resin housing, 306: Right shell, 307: Left shell, 31: Front end, 311: No. 1 accommodating part, 312: 2nd accommodating part, 313: 3rd accommodating part, 314: cover part, 317: recess, 323: front opening, 324: rear opening, 33: cover member, 331: annular part, 333: Front cover, 334: Rear cover, 35: Extension, 351: Outer extension, 353: Inner extension, 37: Elastic connection, 371: Elastic member, 39: Rear end, 391: Battery mounting part, 392: Control unit housing part, 393: Arm part, 395: Control unit, 4: Motor, 413: Output shaft, 45: Fan, 5: Drive mechanism, 6: Clamp mechanism, 8: Regulatory part, 51 : Spindle, 511: Tool mounting part, 513: Bearing, 514: Bearing, 53: Transmission mechanism, 531: Eccentric shaft, 534: Drive bearing, 536: Swing member, 537: First end, 538: Second end Part, 61: Clamp shaft, 67: Lever, 671: Main body part, 672: Operation part, 673: Engagement protrusion, 674: Acting part, 675: Acting projection, 676: Locking recess, 677: Projection, 678: Projection , 679: screw, 68: coil spring, 681: end, 683: end, 71: front elastic member, 73: rear elastic member, 81: upper regulation part, 811: recess, 815: protrusion, 82: bottom Side regulation part, 821: recess, 825: protrusion, 83: left side regulation part, 831: recess, 835: protrusion, 84: right side regulation part, 841: recess, 845: protrusion, 91: tip tool, 93 : Battery, A1: Drive shaft, A2: Rotating shaft, P: Plane

Claims (8)

It ’s a power tool,
With the motor
A spindle configured to swing a detachably mounted tip tool around a first axis that defines the vertical direction of the power tool by power from the motor.
An inner housing that houses at least the motor and the spindle,
An outer housing that houses the inner housing, which is an upper member that is orthogonal to the first axis, extends along a second axis that defines the front-rear direction of the power tool, and is formed separately. And the outer housing formed by connecting the lower member and the lower member to each other in the vertical direction,
It was arranged on the left side and the right side of the inner housing, respectively, in a state of at least partially abutting the inner surface of the first member, which is one of the upper member and the lower member, and was connected and fixed to the first member. With a pair of intervening members,
A pair of elastic members held in a state of being compressed in the left-right direction, respectively, between the left and right portions of the inner housing and the pair of intervening members.
Of the upper end and lower end of each of the pair of intervening members, the first end, which is inserted first into the first member, is inserted into the inner housing toward the tip of the first end. A power tool having at least one first surface extending in the approaching direction. The first aspect of the present invention, wherein the pair of intervening members are configured to engage with the pair of elastic members attached to the inner housing and to be held by the elastic force of the pair of elastic members. Electric tool. The power tool according to claim 1 or 2, wherein the at least one first surface includes at least one inclined surface that inclines toward the inner housing toward the tip. The power tool according to claim 3, wherein the at least one inclined surface includes a plurality of inclined surfaces having different inclination angles from each other. Claim 1 that each of the pair of intervening members has a tubular portion extending in the vertical direction and is connected to the upper member and the lower member by a screw inserted through the tubular portion. The power tool according to any one of 4 to 4. The power tool according to claim 5, wherein the at least one first surface includes a pair of first surfaces arranged on the front side and the rear side of the tubular portion. Each of the pair of intervening members comprises at least one second surface that abuts on the inner surface of the first member.
The power tool according to any one of claims 1 to 6, wherein the at least one second surface is different from the at least one first surface. The axis of rotation of the output shaft of the motor extends parallel to the first axis of the spindle.
The electric motor according to any one of claims 1 to 7, wherein the pair of elastic members is at least partially arranged between the first shaft and the second shaft in the front-rear direction. tool.

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