JP2018167391A - Working tool - Google Patents

Abstract

To provide a vibration control technology that is related to a working tool and is further rational.SOLUTION: A vibration tool 100 includes an outer housing 2, an inner housing 3, a motor 53, a spindle, and a transfer mechanism. The inner housing 3 includes a front end part 31, a rear end part 33, an extension part 35, and an elastic connection part 37. The motor 53, the spindle, and the transfer mechanism are disposed at the front end part 31. The front end part 31 is connected to the outer housing 2 through a front elastic member. The rear end part 33 has a battery attachment part 331 to which a battery 93 is detachably attached. The elastic connection part 37 includes multiple elastic ribs 371 which connect the extension part 35 with the rear end part 33. The multiple elastic ribs 371 are disposed spaced away from each other in a circumferential direction around a longitudinal direction of the inner housing 3.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a work tool that drives a tip tool to perform a machining operation on a workpiece.

  2. Description of the Related Art A work tool is known that transmits a motor output to a spindle and swings a tip tool attached to the lower end of the spindle to perform a machining operation on a workpiece. In such a work tool, the spindle and the motor are accommodated in the housing, but the arrangement of both in the housing is various. For example, in the work tool disclosed in Patent Document 1, the spindle and the output shaft of the motor are arranged substantially in parallel.

US Patent Application Publication No. 2010/0003906

  In the above work tool, the spindle and the motor can be arranged closer to each other than in the case where the spindle and the motor output shaft are arranged in parallel, compared to the case where the spindle and the motor are arranged orthogonally. The work tool can be downsized. On the other hand, in the above work tool, a relatively heavy member such as a motor or a transmission mechanism that transmits the output of the motor to the spindle is disposed close to the spindle, which leads to a decrease in the inertia moment of the housing. Thus, an increase in vibration during work is assumed.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a more rational vibration damping technique related to a work tool.

  According to one aspect of the present invention, there is provided a work tool that drives a tip tool to perform a machining operation on a workpiece. The work tool includes an outer housing, an inner housing, a motor, a spindle, and a transmission mechanism.

  The outer housing is formed in a long shape. The inner housing is formed in an elongated shape and is accommodated in the outer housing. The motor has an output shaft that is rotatable about a first axis that extends across the major axis of the inner housing. The spindle is configured to be detachable from the tip tool, and is supported so as to be rotatable around a second axis extending in parallel with the first axis. The transmission mechanism is configured to transmit the rotational movement of the output shaft to the spindle and to reciprocate the spindle within a predetermined angular range around the second axis.

  The inner housing includes a first end, a second end, an extending portion, and an elastic connecting portion. The first end and the second end are respectively one end and the other end in the major axis direction of the inner housing. The extending portion is formed integrally with the first end portion, and extends in the major axis direction of the inner housing toward the second end portion. Here, “formed integrally with the first end” is not only a case where the first end and the extending portion are integrally formed as one member, but is separate from the first end. This includes the case where the extending portion formed as is connected to the first end portion so as not to be relatively movable.

  The elastic connecting portion elastically connects the extending portion and the second end portion. The motor, the spindle, and the transmission mechanism are disposed at the first end of the inner housing. The first end is connected to the outer housing via the first elastic member. The second end has a power supply-related device that enables power supply from the power supply to the motor. Furthermore, the elastic connecting portion includes a plurality of second elastic members that connect the extending portion and the second end portion, and the plurality of second elastic members are arranged apart from each other in the circumferential direction around the major axis direction. ing.

  Note that “the first end portion is connected to the outer housing via the first elastic member” means that “the first elastic member is interposed between the first end portion and the outer housing. It can be paraphrased. For example, the first end may be connected only by the outer housing and the first elastic member, or the first end and the outer housing may be connected via the first elastic member and another member. Good. In addition, it is preferable that the area | region connected with a 1st end part via a 1st elastic member among elongate outer housings is an area | region which accommodates a 1st end part. Moreover, it is preferable that the first end portion is elastically connected to the outer housing at a plurality of locations so as to be relatively movable in all directions (front and rear, left and right, up and down directions of the work tool). The first elastic member can be composed of, for example, an elastic synthetic resin, a rubber element, a spring element, or the like.

  Further, the plurality of second elastic members constituting the elastic connecting portion may be arranged apart from each other in the circumferential direction around the major axis direction, and the number, shape, arrangement position in the circumferential direction, and the like are limited. It is not something. In addition, the 2nd elastic member can be comprised with the synthetic resin which has elasticity, a rubber element, a spring element, etc. similarly to the 1st elastic member. The second elastic member and the first elastic member may be formed of the same material, or may be formed of different materials.

  According to this aspect, the motor and the spindle are arranged at the first end portion of the elongated inner housing so that the first axis line and the second axis line are parallel to each other. Downsizing can be realized. During the processing operation, relatively large vibrations are likely to occur at the first end, but the first elastic member can suppress transmission of vibration from the first end to the outer housing.

  In addition, a motor, a spindle, and a transmission mechanism, which are heavy objects in the work tool, are arranged in a concentrated manner on the first end, and a power-related device that enables power supply from the power source to the second end. As a result, the moment of inertia of the inner housing can be increased.

  For example, when a battery is employed as the power source, typically, a battery mounting unit configured to be detachable from the battery can be employed as a power-related device that enables power supply from the battery to the motor. In this case, an appropriate heavy object called a battery is attached to the battery attachment portion at the second end. Thereby, the moment of inertia of the inner housing when the battery is mounted can be increased as compared with the case where the battery mounting portion is provided in the vicinity of the first end.

  On the other hand, when an external AC power source is adopted as a power source, typically, as a power-related device that enables power feeding from the external AC power source to the motor, a cable that can be connected to the external AC power source, A converter configured to convert alternating current to direct current can be employed. In this case, the inertial moment of the inner housing can be increased compared to the case where the converter is provided in the vicinity of the first end by arranging a corresponding heavy object called the converter at the second end. Further, the work tool further includes an inverter configured to convert the direct current converted by the converter into an alternating current and drive the motor, and a control unit configured to control driving of the motor via the inverter. You may have. The inverter and the control unit may be disposed at the second end. In this case, the moment of inertia of the inner housing can be further increased.

  In any case, the vibration itself generated in the inner housing can be reduced by increasing the moment of inertia of the inner housing. Further, even when a certain amount of load is applied to the tip tool, the inner housing can be prevented from unnecessarily rotating with respect to the outer housing about the spindle.

  Furthermore, in this aspect, the plurality of second elastic members that connect the extending portion and the second end portion suppress the transmission of vibration from the first end portion to the second end portion, whereby a power supply related device (for example, , Battery mounting parts, converters, etc.) can be protected.

  According to one aspect of the present invention, the outer housing may include a grip portion configured to be gripped by a user. The extending portion may be a portion corresponding to at least a part of the grip portion in the inner housing. According to this aspect, the first elastic member can suppress the vibration of the first end portion of the inner housing from being transmitted to the grip portion gripped by the user. In addition, since the motor, the spindle, and the transmission mechanism are disposed at the first end portion and the battery mounting portion is disposed at the second end portion, it is possible to minimize the components disposed in the extending portion. Thereby, the freedom degree of design of a holding part can be raised.

  According to one aspect of the present invention, the plurality of second elastic members may be formed with a lower elastic coefficient than the extending portion and the second end portion. According to this aspect, it is possible to more effectively suppress the transmission of vibration from the extending portion to the second end portion. The plurality of second elastic members may be formed with a low elastic coefficient by elastically deforming at least a part of the second elastic member by a material having a lower elastic coefficient than the extending part and the second end part. By processing into a shape that is easy to do, the elastic modulus may be low. More preferably, the plurality of second elastic members are formed to have a lower elastic coefficient than the first end portion in addition to the extending portion and the second end portion.

  According to one aspect of the present invention, the second end portion of the inner housing may be coupled to the outer housing via the third elastic member. Note that “the second end portion is connected to the outer housing via the third elastic member” means that “the third elastic member is disposed between the second end portion and the outer housing. It can be paraphrased. For example, the second end may be connected only by the outer housing and the third elastic member, or the second end and the outer housing may be connected via the third elastic member and another member. Good. The vibration transmitted from the first end portion to the second end portion is reduced by the elastic coupling portion (a plurality of second elastic members) compared to the vibration generated at the first end portion. Therefore, when the second end portion is connected to the outer housing via the third elastic member, the vibration transmitted to the outer housing can be reduced compared to the case where the other portion (for example, the extending portion) is connected. it can. In addition to the first end portion, the second end portion provided with the battery mounting portion is also elastically connected to the outer housing, so that the positional relationship between the outer housing and the battery can be stabilized. In addition, the area | region connected with a 2nd end part via a 3rd elastic member among outer housings may be an area | region which accommodates a 2nd end part, and another area | region may be sufficient as it. Similar to the first elastic member, the third elastic member can be composed of a synthetic resin having elasticity, a rubber element, a spring element, or the like. The third elastic member and the first elastic member may be formed of the same material, or may be formed of different materials.

  According to an aspect of the present invention, the outer housing may include a portion disposed in the internal space of the elastic coupling portion surrounded by the plurality of second elastic members. And the 2nd end part of an inner housing may be connected with a part of outer housing arranged in interior space via the 3rd elastic member. According to this aspect, it is possible to provide the outer housing with the portion connected to the second end portion by effectively utilizing the internal space of the elastic connecting portion.

  According to an aspect of the present invention, a portion of the outer housing disposed in the inner space is formed as a separate member from the cover portion that covers the inner housing of the outer housing, and is fixed to the cover portion. It may be. According to this aspect, since another member can be fixed with respect to the cover part of an outer housing after arrange | positioning in the internal space of an elastic connection part, assembly property can be improved.

  According to one aspect of the present invention, a portion of the outer housing disposed in the internal space may be a switch holding member that holds a switch for driving the motor. According to this aspect, it is possible to hold the switch, which is an electrical component, with the outer housing that has less vibration than the inner housing, while effectively utilizing the internal space of the elastic connecting portion.

  According to one aspect of the present invention, the first elastic member may be formed of a material having an ultrafine foam structure. The ultrafine foam structure can also be referred to as an ultrafine cell structure. An example of such a material is a urethane foam having an ultrafine foam structure. A material having an ultrafine foam structure is superior in vibration absorption and durability as compared with general rubber. Therefore, according to this aspect, the effect of suppressing vibration transmission from the first end portion to the outer housing by the first elastic member can be further enhanced.

  According to one aspect of the present invention, the major axis direction of the inner housing is defined as the front-rear direction, the extending direction of the first axis and the second axis is defined as the up-down direction, and the direction intersecting the front-rear direction and the up-down direction is defined as the left-right direction. In this case, the extending part may be formed by connecting the left part and the right part. The plurality of second elastic members may include at least two second elastic members connected to the left side portion and at least two second elastic members connected to the right side portion. According to this aspect, since at least two second elastic members are provided for each of the left side portion and the right side portion of the extension portion, the elastic connection portion includes the extension portion and the second end portion. It is possible to connect in a stable state in the left-right direction.

  According to an aspect of the present invention, the work tool is disposed between the inner housing and the outer housing, and the inner housing restricts relative movement in the reciprocating rotation direction of the spindle with respect to the outer housing. You may further provide the 4th elastic member comprised by. According to this aspect, when an excessive load is applied to the tip tool and the inner housing rotates with respect to the outer housing about the spindle, the inner housing contacts the outer housing and is transmitted to the outer housing. It is possible to prevent an increase in vibration.

1 is an overall perspective view of a vibration tool according to a first embodiment. It is a longitudinal cross-sectional view of a vibration tool. It is sectional drawing in the III-III line of FIG. It is a whole perspective view of an inner housing. It is sectional drawing in the VV line | wire of FIG. FIG. 4 is an enlarged view of the front portion of FIG. 3. FIG. 3 is an enlarged view of a front portion of FIG. 2. It is sectional drawing in the VIII-VIII line of FIG. It is sectional drawing in the IX-IX line of FIG. It is sectional drawing in the XX line of FIG. FIG. 3 is an enlarged view of a rear portion of FIG. 2. FIG. 4 is an enlarged view of a rear portion of FIG. 3. It is a perspective view of the rear side part of an inner housing in the state where a switch holder was connected. It is sectional drawing in the XIV-XIV line | wire of FIG. It is sectional drawing in the XV-XV line | wire of FIG. It is sectional drawing in the XVI-XVI line of FIG. It is a whole perspective view of a transmission dial unit. It is a disassembled perspective view of a transmission dial unit. It is a longitudinal cross-sectional view of a main-body part. It is a cross-sectional view of a main-body part. It is a longitudinal cross-sectional view of a transmission dial unit. It is a side view of a dial. It is a top view of a partition. It is a side view of a partition. It is a longitudinal cross-sectional view of the main-body part in the state where resin is not inject | poured. It is a longitudinal cross-sectional view of the main-body part in the state in which the dial was attached. It is a fragmentary sectional view of the vibration tool concerning a 2nd embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

[First Embodiment]
The first embodiment will be described with reference to FIGS. In the present embodiment, an electric vibration tool 100 that performs a machining operation on a workpiece (not shown) by swinging and driving the tip tool 91 is exemplified as a work tool (see FIG. 1). In the vibration tool 100, a plurality of types of tools such as a blade, a scraper, a grinding pad, and a polishing pad are prepared as a tip tool 91 that can be mounted. The user can select one of the tip tools 91 suitable for a desired processing operation such as cutting, peeling, grinding, polishing, and the like and attach it to the vibration tool 100 to perform the processing operation. In the drawings referred to below, an example in which a blade is attached to the vibration tool 100 is illustrated as an example of the tip tool 91.

  First, a schematic configuration of the vibration tool 100 will be described. As shown in FIGS. 1 and 2, the vibration tool 100 includes a long housing 1. In the present embodiment, the housing 1 is configured as a so-called anti-vibration housing having a two-layer structure, and includes a long outer housing 2 that forms an outline of the vibration tool 100, and a long shape housed in the outer housing 2. The inner housing 3 is included.

  As shown in FIG. 2, a spindle 51 and a motor 53 are accommodated at one end in the extending direction of the housing 1. The spindle 51 is arranged such that its axis A1 is orthogonal to the extending direction of the housing 1. One end of the spindle 51 in the direction of the axis A1 protrudes from the housing 1 and is exposed to the outside. The tip tool 91 can be attached to and detached from this portion. A battery 93 for supplying power to the motor 53 is detachable at the other end in the extending direction of the housing 1. The oscillating tool 100 reciprocally rotates the spindle 51 around the axis A1 within a predetermined angle range by the power of the motor 53, so that the tip tool 91 is oscillated within the oscillating surface OP orthogonal to the axis A1. It is configured.

  In the following description, for the sake of convenience, with respect to the direction of the vibration tool 100, the extending direction of the axis A1 of the spindle 51 is defined as the vertical direction, and the one end side of the spindle 51 to which the tip tool 91 is attached is the lower side, The side is defined as the upper side. Further, a direction perpendicular to the axis A1 and corresponding to the extending direction of the housing 1 (that is, the long axis direction of the housing 1) is defined as the front-rear direction, and one end side of the housing 1 in which the spindle 51 is accommodated. Is defined as the front side, and the other end side where the battery 93 is mounted is defined as the rear side. In addition, a direction perpendicular to the up-down direction and the front-rear direction is defined as a left-right direction. When the illustrated blade is attached as the tip tool 91, the swing direction of the tip tool 91 generally corresponds to the left-right direction.

  Hereinafter, a detailed configuration of the vibration tool 100 will be described. First, the outer housing 2 and the inner housing 3 constituting the housing 1 will be described in order.

  As shown in FIGS. 1 to 3, in this embodiment, the outer housing 2 is formed by connecting an upper shell 27, a lower shell 28, and a switch holder 20 that are formed separately from each other. ing. Each of the upper shell 27, the lower shell 28, and the switch holder 20 is a member integrally formed of synthetic resin. As will be described in detail later, the outer housing 2 is formed by stacking the upper shell 27 and the lower shell 28 in the vertical direction with the switch holder 20 disposed therebetween and connecting them with screws at a plurality of locations. Has been.

  Further, 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 25 that connects the front end portion 21 and the rear end portion 23.

  The front end portion 21 is formed in a substantially rectangular box shape, and a front end portion 31 of the inner housing 3 to be described later is disposed inside. A U-shaped operation lever 61 for operating a lock mechanism 6 (see FIG. 7), which will be described later, is supported on the upper front end portion of the front end portion 21 so as to be rotatable in the vertical direction. The rear end portion 23 is formed in a cylindrical shape that widens toward the rear (the cross-sectional area increases), and includes a switch holder 20 that is fixed inside. The configuration and arrangement of the switch holder 20 will be described in detail later. An elastic connecting portion 37 and a rear end portion 33 of the inner housing 3 to be described later are disposed inside the rear end portion 23.

  The central portion 25 is formed in a substantially uniform cylindrical shape and extends in the front-rear direction in a straight line. The central portion 25 constitutes a grip portion that can be gripped by the user. For this reason, the center part 25 is formed narrower than the front end part 21 and the rear end part 23 so that the user can easily grip it. Hereinafter, the central portion 25 is also referred to as the grip portion 25. A slider 290 is provided in a boundary region between the upper surface of the central portion 25 and the upper surface of the front end portion 21. The slider 290 is arranged so as to be slidable in the front-rear direction, and is configured as an operation member for switching on / off of a switch 29 described later.

  Next, the inner housing 3 will be described. As shown in FIGS. 2 to 4, in this embodiment, the inner housing 3 is formed by connecting a metal housing 38 and a resin housing 39 that are formed separately from each other.

  The metal housing 38 is a housing that houses the tip tool driving mechanism 5 described later, and includes a spindle housing portion 381, a motor housing portion 383, and a contact portion 387 that are integrally formed. The spindle accommodating portion 381 is a portion formed in a cylindrical shape extending in the vertical direction. The motor housing portion 383 is a portion formed in a cylindrical shape having a larger diameter than the spindle housing portion 381 as a whole, and is disposed behind the spindle housing portion 381. The contact portion 387 is a thick plate-like portion extending rearward from the rear end of the motor housing portion 383. The contact portion 387 is arranged such that the plate thickness direction intersects the vertical plane VP along a virtual vertical plane VP including the center line in the left-right direction of the housing 1 (also referred to as a plane including the axis A1 and the axis A2). Has been placed.

  The resin housing 39 is made of synthetic resin, and is formed of a left shell 391 and a right shell 392 that are formed separately from each other. In the present embodiment, the left shell 391 and the right shell 392 are formed substantially symmetrical (plane symmetry with respect to the vertical plane VP) except for a portion connected by screws. As will be described in detail later, the inner housing 3 is formed by being coupled with screws in a state in which the rear end portion of the metal housing 38 is sandwiched between the left shell 391 and the right shell 392 from the left and right directions.

  In the front-rear direction, the inner housing 3 includes a front end portion 31, a rear end portion 33, an extension portion 35 that extends rearward from the rear end of the front end portion 31, an extension portion 35, and a rear end portion 33. And an elastic connecting portion 37 that elastically connects the two.

  The front end portion 31 is a portion including the metal housing 38 and the front end portion of the resin housing 39. The front end portion of the resin housing 39 is formed in a shape corresponding to the upper end portion of the motor housing portion 383, and constitutes a motor cover portion 311 that covers the opening at the upper end of the motor housing portion 383. As shown in FIG. 5, the upper end surface 384 of the motor housing portion 383 is a mating surface with the motor cover portion 311 and is formed as a plane perpendicular to the axis A2. The lower end surface 312 of the motor cover portion 311 is a mating surface with the motor housing portion 383 and is formed as a plane orthogonal to the axis A2.

  As shown in FIGS. 2 to 4, the rear end portion 33 is a rear end portion of the resin housing 39 and is formed in a substantially rectangular tube shape. In the present embodiment, the rear portion of the rear end portion 33 constitutes a battery mounting portion 331 having an engagement structure in which the battery 93 can be slidably engaged. The front portion of the rear end portion 33 constitutes a control unit housing portion 332 that houses the control unit 4.

  The extending portion 35 is a cylindrical portion that extends rearward from the rear end of the motor cover portion 311 in the resin housing 39. Note that the height of the extending portion 35 in the vertical direction is set to be larger than that of the motor cover portion 311. Specifically, the extension part 35 is formed such that the upper part continuously extends behind the motor cover part 311 and the lower part protrudes below the motor cover part 311. And the front end of the lower part of the extension part 35 is arrange | positioned so that it may contact | abut on the outer wall surface of the motor accommodating part 383. FIG. Further, the extending portion 35 is a portion corresponding to at least a part of the grip portion 25 of the outer housing 2. Here, “corresponding to at least a part of the gripping part 25” can be rephrased as “at least a part of the extending part 35 is accommodated in at least a part of the gripping part 25”. . In the present embodiment, the length of the extending portion 35 in the front-rear direction is set to be approximately the same as the length of the gripping portion 25 in the front-rear direction, and substantially the entire extending portion 35 is accommodated in the gripping portion 25. .

  The elastic connecting portion 37 is a portion of the resin housing 39 that extends to the rear of the extending portion 35. The elastic connecting portion 37 includes a plurality of elastic ribs 371 that connect the extending portion 35 and the rear end portion 33 in the front-rear direction. The plurality of elastic ribs 371 are arranged away from each other in the circumferential direction around the major axis of the inner housing 3 extending in the front-rear direction. In other words, an opening that connects the internal space 370 of the elastic connecting portion 37 and the outside is formed between the adjacent elastic ribs 371. In the present embodiment, a total of four elastic ribs 371 are provided, two for each of the left shell 391 and the right shell 392. In each of the left shell 391 and the right shell 392, the two elastic ribs 371 are spaced apart from each other in the vertical direction, and extend so that the distance in the vertical direction slightly increases toward the rear. In the left-right direction, the elastic ribs 371 of the left shell 391 and the elastic ribs 371 of the right shell 392 extend so as to be spaced apart from each other toward the rear.

  Each elastic rib 371 is formed in a curved strip shape, and is given flexibility. Thereby, the elastic rib 371 can be elastically deformed. Furthermore, in the present embodiment, the four elastic ribs 371 are formed of a material having a lower elastic coefficient than other portions of the resin housing 39 (that is, the motor cover portion 311, the extending portion 35, and the rear end portion 33). Has been. Specifically, the other portion is made of glass fiber reinforced polyamide, while the elastic rib 371 is made of polyacetal containing no reinforcing fiber. However, the material of the resin housing 39 is not limited to this example. For example, when the other part is formed of glass fiber reinforced polyamide, the elastic rib 371 may be formed of polycarbonate or ABS resin (both of which do not include reinforcing fiber). In the present embodiment, the left shell 391 and the right shell 392 are members integrally formed as a whole, although only the elastic ribs 371 are made of different materials. As described above, in the present embodiment, each elastic rib 371 is formed in a shape that is more easily elastically deformed than other portions of the resin housing 39 and is formed of a material having a low elastic coefficient. The elastic modulus is lower than that of the portion.

  Here, a connection structure between the metal housing 38 of the inner housing 3 and the resin housing 39 will be described. In the present embodiment, the metal housing 38 and the resin housing 39 are connected in the front-rear direction by connecting the contact portion 387 and the portion of the resin housing 39 that constitutes the front end portion of the extending portion 35. In the vertical direction, the metal housing 38 and the resin housing 39 are connected to the upper end portion of the motor housing portion 383 via the motor cover portion 311. Details will be described below.

  As shown in FIG. 6, the left and right side surfaces of the contact portion 387 are each formed as a plane parallel to the vertical plane VP (that is, a plane whose normal direction is the left-right direction). The left and right side surfaces of the contact portion 387 are surfaces that contact the second contact surface 390 of the resin housing 39 when the metal housing 38 and the resin housing 39 are connected. Therefore, hereinafter, the left and right side surfaces of the contact portion 387 are also referred to as first contact surfaces 380. Further, as shown in FIG. 7, the contact portion 387 is provided with two through holes 388 that penetrate the contact portion 387 in the left-right direction. Note that the two through holes 388 are arranged at positions offset from each other in the front-rear direction and the up-down direction.

  On the other hand, as shown in FIG. 6, two projecting portions 394 that project toward the vertical plane VP are provided on the inner side of the left shell 391 and the right shell 392 at the front end portion of the extending portion 35. . As shown in FIG. 8, each protrusion 394 has a shape in which a cylinder having a diameter larger than that of the through hole 388 of the contact portion 387 and a cylinder having substantially the same diameter as the through hole 388 are continuously arranged in a coaxial manner. Hereinafter, the large-diameter column portion is referred to as a large-diameter portion 395, and the small-diameter column portion is referred to as a small-diameter portion 396. The annular projecting end surface of the large diameter portion 395 is formed as a plane parallel to the vertical plane VP (that is, a plane whose normal direction is the left-right direction). The protruding end surface of the large-diameter portion 395 is a surface that contacts the first contact surface 380 when the metal housing 38 and the resin housing 39 are connected. Therefore, hereinafter, the protruding end surface of the large diameter portion 395 is also referred to as a second contact surface 390. The small diameter portion 396 is a portion that is inserted into the through hole 388 when the metal housing 38 and the resin housing 39 are connected. For this reason, in each of the left shell 391 and the right shell 392, the two protrusions 394 are disposed at positions corresponding to the through holes 388. Each protrusion 394 of the left shell 391 is formed with a stepped through hole 397 that penetrates in the left-right direction along its axis, and each protrusion 394 of the right shell 392 has a right and left along its axis. A screw hole 398 penetrating in the direction is formed.

  When connecting the metal housing 38 and the resin housing 39, the assembly operator of the vibration tool 100 sandwiches the rear end portion of the metal housing 38 between the left shell 391 and the right shell 392 from the left and right directions. As a result, as shown in FIG. 8, the second contact surface 390 of the large-diameter portion 395 contacts the first contact surface 380 of the contact portion 387, and the left shell is inserted into the through hole 388 of the contact portion 387. 391 and the small diameter portion 396 of the right shell 392 are inserted from the left and right. The protruding length of the small diameter portion 396 from the large diameter portion 395 is approximately one half of the plate thickness (width in the left-right direction) of the contact portion 387. In this state, the operator inserts a fixing screw 389 into the through-hole 397 of the left shell 391 from the left, and is screwed into the screw hole 398 of the right shell 392, so that the left shell 391 and the contact portion 387 are engaged. , And the right shell 392. Due to the axial force of the screw 389, the left shell 391, the abutting portion 387, and the right shell 392 are firmly connected in the left-right direction without any gap.

  Further, as shown in FIG. 6, screw insertion portions 385 projecting in a semicircular cross section outwardly in the radial direction of the motor housing portion 383 and extending in the vertical direction are provided at four locations in the circumferential direction of the motor housing portion 383. It has been. On the other hand, as shown in FIG. 5, screw holes 313 extending in the vertical direction are formed in the motor cover portion 311 at four locations corresponding to the screw insertion portions 385. The operator inserts a screw 386 into a through hole formed between the screw insertion portion 385 and the motor 53 from below the motor housing portion 383 and further engages with the screw hole 313, whereby the motor housing portion 383. And the motor cover 311 are connected. Note that the screw 386 is arranged loosely between the screw insertion portion 385 and the motor 53.

  In addition to the above connection locations, the assembly operator fits the bosses formed on the left shell 391 and the right shell 392 at a plurality of locations and connects them with screws as shown in FIGS. Thus, the inner housing 3 of this embodiment can be assembled very easily.

  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. 7, the front end portion 31 of the inner housing 3 accommodates the tip tool drive mechanism 5 and the lock mechanism 6.

  The tip tool driving mechanism 5 will be described. As shown in FIG. 7, the tip tool driving mechanism 5 is a mechanism that swings and drives the tip tool 91, and includes a spindle 51, a motor 53, and a transmission mechanism 55.

  The spindle 51 is a hollow, substantially cylindrical long member. In the present embodiment, the spindle 51 is accommodated in the lower part of the spindle accommodating portion 381 and is supported by two bearings so as to be rotatable around the axis A1. The spindle 51 has a flange-like tool mounting portion 511 protruding outward in the radial direction at the lower end exposed to the outside from the housing 1. The tool mounting portion 511 is a portion configured to be detachable from the tip tool 91. In the present embodiment, the tip tool 91 is sandwiched between the tool mounting portion 511 and the clamp head 521 of the clamp shaft 52 held at the clamp position by the lock mechanism 6 described later.

  The motor 53 as a drive source is housed in the motor housing portion 383 so that the axis A2 of the output shaft 531 that rotates together with the rotor extends in parallel (that is, in the vertical direction) with the axis A1 of the spindle 51. In this embodiment, the output shaft 531 protrudes downward from the rotor. In the present embodiment, a small and high output brushless DC motor is employed as the motor 53.

  The transmission mechanism 55 is configured to transmit the rotational motion of the motor 53 to the spindle 51 and to reciprocate the spindle 51 within a predetermined angular range around the axis A1. The transmission mechanism 55 is disposed in the metal housing 38 across the lower portion of the spindle housing portion 381 and the lower portion of the motor housing portion 383. The transmission mechanism 55 of the present embodiment includes an eccentric shaft 551, a swing arm 553, and a drive bearing 555. In addition, since the structure of the transmission mechanism 55 is known, it demonstrates easily here. The eccentric shaft 551 is coaxially connected to the output shaft 531 of the motor 53, and has an eccentric portion that is eccentric with respect to the axis A2. A drive bearing 555 is attached to the outer peripheral portion of the eccentric portion. The swing arm 553 is a member that connects the drive bearing 555 and the spindle 51. As shown in FIG. 9, one end of the swing arm 553 is formed in an annular shape and is fixed to the outer periphery of the spindle 51. On the other hand, the other end portion of the swing arm 553 is formed in a bifurcated shape and is disposed so as to contact the outer peripheral portion of the drive bearing 555 from the left and right.

  When the motor 53 is driven, the eccentric shaft 551 rotates integrally with the output shaft 531. As the eccentric shaft 551 rotates, the center of the eccentric portion moves around the axis A2, so that the drive bearing 555 also moves around the axis A2. As a result, the swing arm 553 is swung within a predetermined angle range with the spindle 51 as a fulcrum. Since one end of the swing arm 553 is fixed to the spindle 51, the spindle 51 reciprocates around the axis A1 within a predetermined angular range in accordance with the swing motion of the swing arm 553. As a result, the tip tool 91 fixed to the spindle 51 (more specifically, the tool mounting portion 511) is driven to swing within the swing surface OP, so that the machining operation can be performed.

  Hereinafter, the lock mechanism 6 will be described. The lock mechanism 6 is a mechanism configured to lock the clamp shaft 52 at a clamp position (position shown in FIGS. 7 and 10) where the tip tool 91 can be clamped with the spindle 51. As shown in FIGS. 7 and 10, the clamp shaft 52 is a substantially cylindrical long member configured to be coaxially inserted into the spindle 51 in the direction of the axis A <b> 1. The clamp shaft 52 has a flange-shaped clamp head 521 at the lower end. A groove 523 is provided at the upper end of the clamp shaft 52. The groove portion 523 is a portion in which a plurality of grooves dug over the entire circumference of the clamp shaft 52 are formed in the vertical direction.

  The lock mechanism 6 of the present embodiment is disposed above the spindle 51 in the spindle accommodating portion 381. The lock mechanism 6 includes a compression coil spring 63, a collar 65, and a pair of clamp members 67. Since the configuration of the lock mechanism 6 is well known, it will be briefly described here. The collar 65 is formed in an annular shape, and is rotatably supported by a bearing held in the upper portion of the spindle accommodating portion 381. The collar 65 is always urged upward by a compression coil spring 63 disposed between the spindle 51 and the collar 65. The pair of clamp members 67 are arranged so as to be opposed to each other in the front-rear direction in a space formed inside the collar 65 while being constantly biased downward. On the surfaces of the pair of clamp members 67 facing each other, a protrusion 671 is provided. The protrusion 671 is a part in which a plurality of protrusions extending in the horizontal direction are formed in the vertical direction.

  The lock mechanism 6 is configured to operate in conjunction with the turning operation of the operation lever 61 by the user. The operation lever 61 is connected to the rotation shaft 62. The rotation shaft 62 is supported by the outer housing 2 so as to be rotatable around a rotation axis extending in the left-right direction above the lock mechanism 6. The rotation shaft 62 rotates in accordance with the rotation operation of the operation lever 61.

  As shown in FIG. 10, the rotation shaft 62 is formed with an eccentric portion 621 that is eccentric with respect to the rotation axis. When the operation lever 61 is arranged at the lock position shown in FIG. 1, the portion of the eccentric portion 621 having a smaller diameter is arranged away from the collar 65 and upward as shown in FIGS. 7 and 10. The collar 65 is urged upward by the compression coil spring 63 and disposed at the uppermost position. On the other hand, the clamp member 67 is biased downward. For this reason, the clamp member 67 is moved radially inward of the collar 65 by the action of the inclined surface formed on a part of the inner peripheral surface of the collar 65 and a part of the outer peripheral surface of the clamp member 67. Accordingly, the protrusion 671 and the groove 523 are engaged, and the clamp shaft 52 is clamped by the clamp member 67. In this state, the clamp shaft 52 is urged upward by the compression coil spring 63 and is locked at the clamp position, whereby the tip tool 91 is clamped between the tool mounting portion 511 and the clamp head 521 and is clamped with respect to the spindle 51. Fixed.

  On the other hand, when the operation lever 61 is pivoted upward from the lock position shown in FIG. 1 and disposed at the lock release position, the larger diameter portion of the eccentric portion 621 contacts the upper end portion of the collar 65 from above, The collar 65 is pushed down against the urging force of the compression coil spring 63. The clamp member 67 is also pushed down together with the collar 65, but further downward movement is prohibited at a predetermined position. When only the collar 65 is further moved to the lowest position in this state, the contact between the collar 65 and the inclined surface formed on the clamp member 67 is released, and the clamp member 67 becomes movable in the radial direction. That is, the lock of the clamp shaft 52 is released, and the user can pull out the clamp shaft 52 from the spindle 51.

  The internal structure of the rear end portion 33 will be described. As shown in FIGS. 11 and 12, in the battery mounting portion 331 constituting the rear portion of the rear end portion 33, the power supply terminal of the battery 93 is associated with the battery 93 being engaged with the battery mounting portion 331. A power receiving terminal and the like that can be electrically connected to each other are provided. In addition, since the battery mounting part 331 and its internal structure itself are known, detailed description is abbreviate | omitted. The control unit 4 is accommodated in the control unit accommodation portion 332 that constitutes the front portion of the rear end portion 33. In the present embodiment, the control unit 4 includes a substrate on which a CPU that controls driving of the motor 53 and a switching element that operates based on a control signal from the CPU are mounted.

  The internal structure of the elastic connection part 37 is demonstrated. As illustrated in FIG. 13, the switch holder 20 is disposed in the internal space 370 (a space region surrounded by the elastic rib 371 in the circumferential direction) of the elastic coupling portion 37. The switch holder 20 is a member configured to hold the switch 29. In the present embodiment, the switch holder 20 also holds a speed change dial unit 8 described later. As described above, the switch holder 20 is disposed in the internal space 370 of the elastic coupling portion 37, but is fixed to the upper shell 27 and the lower shell 28 with screws and constitutes a part of the outer housing 2. Although details will be described later, the switch holder 20 is elastically connected to the rear end portion 33 of the inner housing 3.

  The internal structure of the extending part 35 will be described. As shown in FIGS. 2 and 3, in the present embodiment, the tip tool drive mechanism 5 (that is, the spindle 51, the motor 53, and the transmission mechanism 55) is disposed at the front end portion 31, and the battery mounting portion 331 is the rear end portion 33. Therefore, it is possible to minimize the parts arranged in the extending portion 35. In view of this, the extending portion 35 is provided with conductors and connection terminals (not shown) for connecting the control unit 4 and the substrate of the motor 53, etc., but other components are not particularly arranged. For this reason, the extending portion 35 is formed to be thinner than the front end portion 31, the elastic connecting portion 37, and the rear end portion 33 so that the grip portion 25 can be easily gripped.

  Hereinafter, an 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 connected via elastic members at a plurality of positions in the front-rear direction. Specifically, two front elastic members 71 are interposed between the front end portion 21 of the outer housing 2 and the front end portion 31 of the inner housing 3 (see FIG. 6). Further, four rear elastic members 76 are interposed between the switch holder 20 of the outer housing 2 and the rear end portion 33 of the inner housing 3 (see FIG. 12).

  First, the arrangement of the front elastic member 71 will be described. As shown in FIG. 4, a concave portion 382 having an elliptical shape in a side view is provided in a boundary region between the spindle housing portion 381 and the motor housing portion 383 in the metal housing 38. The front elastic member 71 is fitted in the recess 382. The front elastic member 71 has three through holes 711 that are spaced apart from each other in the vertical direction. Of these, a projection provided at the bottom of the recess 382 is fitted in the middle through-hole 711. As shown in FIG. 14, the recesses 382 are provided symmetrically on the left and right sides of the front end portion 31. In the present embodiment, the front elastic member 71 is formed of a material having an ultrafine foam structure (also referred to as an ultrafine cell structure). For example, it is possible to adopt a urethane foam having an ultrafine foam structure (a urethane resin having an ultrafine foam structure). In the present embodiment, among such urethane foams, a material called a microcellular polyurethane elastomer, which is particularly excellent in vibration absorption and durability, is employed.

  In the present embodiment, the front elastic member 71 is connected to a connecting member 72 fixed to the outer housing 2. The connecting member 72 includes a base portion 721 (see FIG. 9) formed in a substantially U shape, and a pair of cylindrical portions 724 (see FIG. 14) extending from both ends of the base portion 721 in a direction perpendicular to the base portion 721. ). The connecting member 72 is fixed to the outer housing 2 in a state where the base portion 721 is disposed at the bottom of the lower shell 28 below the metal housing 38 and the cylindrical portion 724 protrudes upward and faces the front elastic member 71. Has been.

  Specifically, as shown in FIG. 15, a pair of through holes 281 are formed in the lower shell 28 at the left front end portion and the right front end portion of the front end portion 21 of the outer housing 2. Are formed with a pair of cylindrical portions 271 that protrude downward (only the left through hole 281 and the cylindrical portion 271 are shown in FIG. 15). A female screw is formed on the inner peripheral surface of the cylindrical portion 271. In a state where the cylindrical portion 271 of the upper shell 27 is fitted into the large diameter portion formed at the upper end portion of the cylindrical portion 724 of the connecting member 72, a screw 726 is inserted into the cylindrical portion 724 from the lower side of the through hole 281. The connecting member 72 is fixed to the outer housing 2 by being screwed into the cylindrical portion 271. In other words, the connecting member 72 constitutes a part of the outer housing 2.

  Note that the upper shell 27 and the lower shell 28 are not only connected via the cylindrical portion 271 at the left front end portion and the right front end portion of the front end portion 21, but also as shown in FIG. The rear end portion and the right rear end portion are also fixed with screws (only the right rear end portion is shown in FIG. 15).

  As shown in FIG. 14, each cylindrical portion 724 of the connecting member 72 has two protruding portions 725 that protrude toward the inner housing 3. The tip portions of the two protruding portions 725 are fitted into the upper and lower through-holes 711 among the three through-holes 711 (see FIG. 4) of the front elastic member 71, respectively. In addition, the front-end | tip part of the protrusion part 725 is arrange | positioned with the clearance gap between the bottom parts in the state which pressed the front side elastic member 71 toward the bottom part of the recessed part 382. FIG. Moreover, the outer peripheral part of the protrusion part 725 is covered with the front side elastic member 71 over the perimeter. For this reason, the protrusion 725 can be relatively moved in the recess 382 while compressing the front elastic member 71 in any of the vertical direction, the front-rear direction, and the left-right direction. As described above, the front end portion 21 of the outer housing 2 is connected to the front end portion 31 of the inner housing 3 through the front elastic member 71 so as to be relatively movable in all directions.

  Hereinafter, the arrangement of the rear elastic member 76 will be described. As shown in FIGS. 12, 13, and 16, the switch holder 20 is disposed in the internal space 370 of the elastic coupling portion 37 of the inner housing 3. The switch holder 20 includes a main body portion 202, a pair of first holding portions 203, a pair of first arm portions 204, and a pair of cylindrical portions 206.

  As shown in FIG. 12, the main body portion 202 is a housing portion for the switch 29 and is disposed in the central portion in the left-right direction in the internal space 370. The pair of first holding portions 203 are provided on the left side portion and the right side portion of the main body portion 202, respectively, and have recesses that open to the left and right, respectively. A rear elastic member 76 is fitted in the recess of each first holding portion 203. The rear elastic member 76 has a through hole 761 at the center. As the rear elastic member 76, for example, a urethane foam having an ultrafine foam structure can be employed. In the present embodiment, as the rear elastic member 76, the same microcellular polyurethane elastomer as the front elastic member 71 is employed. The pair of first arm portions 204 are portions protruding leftward and rightward from the left rear end portion and the right rear end portion of the main body portion 202, respectively. As shown in FIG. 16, the pair of cylindrical portions 206 are cylindrical portions that protrude downward from the left rear end portion and the right rear end portion of the main body portion 202.

  On the other hand, as shown in FIG. 12, the rear end portion 33 of the inner housing 3 is provided with a pair of second holding portions 333 and a pair of second arm portions 334. The pair of second holding portions 333 are provided at the left front end portion and the right front end portion of the rear end portion 33. The second holding part 333 is provided so that a part of the second holding part 333 protrudes forward from the control unit housing part 332. A pair of 2nd holding | maintenance part 333 has a recessed part each opened to right and left so that it may oppose. Similar to the first holding part 203, the rear elastic member 76 is fitted in the recess of each second holding part 333. The first arm portion 204 of the switch holder 20 is disposed inside (vertical surface VP side) of the rear elastic member 76 fitted into the second holding portion 333, and the tip end portion 205 of the first arm portion 204 is It is fitted in the through hole 761. The pair of second arm portions 334 protrude obliquely forward from the pair of second holding portions 333 so as to be close to each other toward the front. A protruding portion 335 that protrudes toward the rear elastic member 76 fitted in the first holding portion 203 is provided at the distal end portion of the second arm portion 334. The protruding portion 335 is fitted in the through hole 761 of the rear elastic member 76 fitted in the first holding portion 203.

  As described above, the first holding portion 203 and the first arm portion 204 of the switch holder 20 and the second holding portion 333 and the second arm portion 334 of the rear end portion 33 are alternately arranged on the left side and the right side of the switch holder 20. Is combined. Therefore, when one of the switch holder 20 and the rear end portion 33 is provided with two holding portions for the rear elastic member 76 and the other is provided with two arm portions whose front end portions are fitted to the rear elastic member 76. In comparison, a compact arrangement of the four rear elastic members 76 is realized.

  As described above, an opening that connects the internal space 370 and the outside is formed between the elastic ribs 371 adjacent in the circumferential direction. For this reason, as shown in FIG. 13, the switch holder 20 can be easily disposed in the internal space 370 through the openings between the elastic ribs 371. Moreover, in this embodiment, parts other than the main-body part 202 among the switch holders 20 protrude outside from the internal space 370 through the opening. That is, the opening between the elastic ribs 371 is used as a connection path between the switch holder 20 and the rear end portion 33. For this reason, after arrange | positioning the switch holder 20 in the internal space 370, the switch holder 20 and the rear-end part 33 can be easily connected via an opening part.

  With the above configuration, the switch holder 20 is connected to the rear end portion 33 via the pair of rear elastic members 76 on the left and right sides of the main body portion 202, and on the left and right diagonally rear sides of the main body portion 202. The rear end portion 33 is connected via an elastic member 76. Further, the switch holder 20 is connected to the upper shell 27 and the lower shell 28 through a pair of cylindrical portions 206 as a part of the outer housing 2.

  Specifically, as shown in FIG. 16, at the rear end portion 23 of the outer housing 2, a pair of left and right through holes 283 are formed on the lower surface of the lower shell 28. Are formed with a pair of left and right cylindrical portions 273 projecting downward. A female screw is formed on the inner peripheral surface of the cylindrical portion 273. The cylindrical portion 273 of the upper shell 27 is fitted into a large diameter portion formed at the upper end portion of the cylindrical portion 206 of the switch holder 20, and a screw 207 is inserted into the cylindrical portion 206 from the lower side of the through hole 283, so that the cylindrical portion 273 The switch holder 20 is fixed to the upper shell 27 and the lower shell 28 by being screwed together. In the assembly operation of the housing 1, the switch holder 20 is fixed to the upper shell 27 and the lower shell 28 after being connected to the rear end portion 33 via the rear elastic member 76. Also in this case, the opening between the elastic ribs 371 is used as a connection path between the switch holder 20 and the outer housing 2. Thereby, the switch holder 20 which is a part of the outer housing 2 can be easily assembled in the internal space 370 of the elastic connecting portion 37.

  As shown in FIG. 12, the distal end portion 205 of the first arm portion 204 and the protruding portion 335 of the second arm portion 334 are respectively provided with the rear elastic member 76 and the concave portions of the second holding portion 333 and the first holding portion 203. In a state where it is pressed toward the bottom part, a gap is provided between the bottom part and the bottom part. Further, the outer peripheral portions of the distal end portion 205 and the protruding portion 335 are covered with the rear elastic member 76 over the entire circumference. For this reason, the front-end | tip part 205 is relatively movable within the recessed part of the 2nd holding | maintenance part 333, compressing the back side elastic member 76 about any direction of an up-down direction, the front-back direction, and the left-right direction. Similarly, the protruding portion 335 is relatively movable in the concave portion of the first holding portion 203 while compressing the rear elastic member 76 in any of the vertical direction, the front-rear direction, and the left-right direction. As described above, the switch holder 20 as a part of the outer housing 2 is coupled to the rear end portion 33 of the inner housing 3 through the rear elastic member 76 so as to be relatively movable in all directions.

  As shown in FIG. 11, the switch 29 is configured to move the movable contact between the on position and the off position with respect to the fixed contact in accordance with the operation of the slider 290 (see FIG. 2). The switch lever 291 is connected. The switch lever 291 has a rotating portion 292 that is rotatably supported by the switch holder 20. The rotating part 292 is rotatably connected to an operating part (not shown) connected to the switch 29. As shown in FIG. 13, the rotating portion 292 protrudes above the inner housing 3 from an opening formed between the two upper elastic ribs 371 without interfering with the elastic ribs 371. As shown in FIG. 2, the upper end portion of the rotating portion 292 is rotatably connected to one end portion of the interlocking portion 293. The interlocking portion 293 extends in the front-rear direction between the inner housing 3 and the outer housing 2, and is connected to the slider 290 at the other end portion. With such a configuration, the switch lever 291 moves the movable contact between the on position and the off position with respect to the fixed contact in accordance with the operation of the slider 290.

  In the present embodiment, the switch holder 20 is configured not only as a switch 29 but also as a holding member for the transmission dial unit 8. Specifically, as shown in FIG. 13, a dial holding portion 209 into which the transmission dial unit 8 can be fitted is provided on the upper portion of the rear side portion of the switch holder 20. The speed change dial unit 8 is arranged so that the rotating shaft of the dial 87 (the axis A3 of the rotating shaft 822 described later) extends in the front-rear direction, and the upper portion thereof is exposed upward from the dial holding portion 209. Is retained. As described above, when the switch holder 20 is fixed to the upper shell 27 and the lower shell 28, a part of the outer periphery of the dial 87 is formed on the upper surface of the outer housing 2, as shown in FIG. It is exposed to the outside of the outer housing 2 through the through-hole 275. The configuration of the transmission dial unit 8 will be described in detail later.

  As shown in FIG. 12, an intermediate elastic member 78 is disposed between the outer housing 2 and the inner housing 3 in addition to the front elastic member 71 and the rear elastic member 76. Specifically, the left rear end portion and the right rear end portion of the extending portion 35 are each formed as a step portion 353 that is recessed toward the center in the left-right direction. A rectangular parallelepiped intermediate elastic member 78 is bonded to each stepped portion 353. In the present embodiment, the intermediate elastic member 78 is disposed with a slight gap between the intermediate elastic member 78 and the outer housing 2 (gripping portion 25) in the left-right direction, and the extending portion 35 and the gripping portion 25 are always provided. It is not elastically connected. Unlike the front elastic member 71 and the rear elastic member 76, the intermediate elastic member 78 corresponds only to the left-right direction that is the reciprocating rotation direction of the spindle 51, and the inner housing 3 is left and right with respect to the outer housing 2. Restrict relative movement in the direction. In the present embodiment, the intermediate elastic member 78 is also made of the same microcellular polyurethane elastomer as the front elastic member 71.

  Hereinafter, the operation of the vibration tool 100 will be described. The user attaches the tip tool 91 corresponding to the desired machining operation to the tool attachment portion 511, grasps the grasping portion 25, and switches the slider 290 to the on position. As a result, the switch 29 is turned on via the switch lever 291. The control unit 4 (specifically, the CPU) starts driving the motor 53 in response to the switch 29 being turned on. The control unit 4 sets the number of rotations of the motor 53 based on a resistance value set via a speed change dial unit 8 described later. As the motor 53 is driven, the spindle 51 reciprocates around the axis A1 within a predetermined angle range, and the tip tool 91 swings within the swing surface OP (in the case of the illustrated blade, generally in the left-right direction). Let When the user presses the tip tool 91 against the workpiece, the vibration tool 100 can perform a machining operation.

  During the machining operation, a relatively large vibration is likely to occur at the front end portion 31 of the inner housing 3 that houses the tip tool driving mechanism 5. Of these, the most dominant is the vibration in the swing direction of the tip tool 91 in the swing surface OP. In this embodiment, as shown in FIGS. 6 and 8, the contact of the metal housing 38 with the first contact surface 380 and the second contact surface 390 that intersect the swing surface OP contact each other. The portion 387 and the protruding portion 394 of the resin housing 39 are connected. Thereby, the metal housing 38 and the resin housing 39 can be connected while effectively suppressing the relative movement in the swinging direction. Moreover, since the 1st contact surface 380 and the 2nd contact surface 390 cross | intersect the rocking | fluctuation surface OP, it can suppress that a relative slip generate | occur | produces between both. For this reason, generation | occurrence | production of the heat_generation | fever and abnormal vibration resulting from a relative slip can be suppressed effectively. Thus, in the inner housing 3 of the present embodiment, a simple and rational connection structure is realized.

  In particular, in the present embodiment, two contact areas where the first contact surface 380 and the second contact surface 390 are in contact with each other correspond to the two protrusions 394. Compared with the case where the contact area is provided only at one place, the relative movement of the metal housing 38 and the resin housing 39 in the swinging direction can be more reliably suppressed. Further, by fixing the contact portion 387 between the left shell 391 and the right shell 392 with screws 389, it is possible to realize a strong connection structure between the contact portion 387, the left shell 391, and the right shell 392. it can.

  Note that the upper end surface 384 of the motor housing portion 383 and the lower end surface 312 (see FIG. 5) of the motor cover portion 311 are both mating surfaces parallel to the swing surface OP, but in this embodiment, the metal housing 38 and Since the relative movement in the swinging direction of the resin housing 39 is suppressed, the possibility that the upper end surface 384 and the lower end surface 312 slide and generate heat can be effectively reduced.

  Regarding the transmission of vibration from the inner housing 3 to the outer housing 2, first, the front elastic member 71 (see FIG. 14) interposed between the recess 382 of the metal housing 38 and the connecting member 72 fixed to the outer housing 2. ) Can suppress transmission of vibration from the front end portion 31 to the outer housing 2 (particularly, the grip portion 25).

  In the present embodiment, the spindle 51, the motor 53, and the transmission mechanism 55, which are heavy objects in the vibration tool 100, are concentrated on the front end portion 31, while the battery mounting portion 331 provided at the rear end portion 33 is A configuration in which a corresponding heavy object such as the battery 93 is mounted is employed. As a result, the inertia moment of the inner housing 3 when the battery 93 is attached can be increased as compared with the case where the battery attaching portion 331 is provided in the vicinity of the front end portion 31, and therefore vibrations generated in the inner housing 3. It can reduce itself. Further, even when a certain load is applied to the tip tool 91, the inner housing 3 can be prevented from being unnecessarily rotated with respect to the outer housing 2 around the spindle 51.

  Further, the plurality of elastic ribs 371 (see FIG. 13) that connect the extending portion 35 and the rear end portion 33 suppress the transmission of vibration from the front end portion 31 to the rear end portion 33, so that the battery mounting portion 331 and the battery Protection of electrical components such as 93 terminals is achieved. In particular, since the elastic rib 371 is formed so that the elastic coefficient is lower than that of the extending portion 35 and the rear end portion 33, vibration transmission from the extending portion 35 to the rear end portion 33 is more effective. Can be suppressed. In addition, two elastic ribs 371 are provided for each of the left side portion and the right side portion (the left shell 391 and the right shell 392) of the extension portion 35, so that the extension portion 35, the rear end portion 33, Can be connected in a stable state in the left-right direction.

  Further, the rear end portion 33 is connected to a part of the outer housing 2 (switch holder 20) via a rear elastic member 76 (see FIG. 12). The vibration transmitted to the rear end portion 33 is reduced by the elastic rib 371 compared to the vibration generated at the front end portion 31. Therefore, when the rear end portion 33 is coupled to the outer housing 2 via the rear elastic member 76, the vibration transmitted to the outer housing 2 is less than when the other portion (for example, the extending portion 35) is coupled. Can be reduced. In addition to the front end portion 31, the rear end portion 33 provided with the battery mounting portion 331 is also elastically connected to the outer housing 2, so that the positional relationship between the outer housing 2 and the battery 93 can be stabilized. . In particular, in the present embodiment, one front elastic member 71 is disposed on each of the left and right sides of the inner housing 3, and two rear elastic members 76 are disposed on the left and right sides of the inner housing 3, thereby ensuring more certainty. Stabilization can be achieved.

  In the present embodiment, the switch holder 20 is disposed in the internal space 370 of the elastic connecting portion 37 as a part of the outer housing 2 connected to the rear end portion 33. Thereby, the switch 29 which is an electrical component can be held by the outer housing 2 with less vibration than the inner housing 3 while effectively utilizing the internal space 370. Further, by utilizing the switch holder 20 as a holding member for the speed change dial unit 8 that is also an electrical component, the speed change dial unit 8 can be efficiently held by the outer housing 2 without increasing the number of parts. it can.

  When an excessive load is applied to the tip tool 91 and the inner housing 3 tries to rotate in the left-right direction with respect to the outer housing 2 around the spindle 51, the inner tool 3 is disposed on the left and right of the rear end portion of the extending portion 35. The intermediate elastic member 78 prevents this. Accordingly, it is possible to prevent the inner housing 3 from coming into contact with the outer housing 2 and increase the vibration transmitted to the outer housing 2. In this way, the user can comfortably perform the machining operation using the vibration tool 100 with effective vibration suppression measures taken.

  Hereinafter, the configuration of the transmission dial unit 8 will be described. The transmission dial unit 8 is configured as an operation device for setting the number of rotations of the motor 53 in a stepless manner in accordance with the rotation operation of the user's dial 87. As shown in FIGS. Part 81, dial 87, conducting wire 840, and partition wall 88 are included. Hereinafter, these components will be described in order.

  As shown in FIG. 19, in the present embodiment, the main body 81 includes a variable resistor 82, a collar 83, a circuit board 84, and a case 85.

  The variable resistor 82 is configured as a rotary variable resistor having a known configuration. Therefore, in brief, the variable resistor 82 includes a main body 821 containing a resistor, and a rotating shaft 822 that protrudes from the main body 821 in the direction of the axis A3 and has a movable contact (in the figure, the main body 821). 821 and the entire variable resistor 82 including the rotating shaft 822 are simplified and shown as one unit). The variable resistor 82 has a resistance value corresponding to a contact position between the movable contact and the resistor by sliding the movable contact on the resistor in the main body 821 by rotating the rotary shaft 822 around the axis A3. Is configured to change. The rotary shaft 822 has a D-shaped cross section perpendicular to the axis A3 (see FIG. 18).

  In the following, regarding the direction of the speed change dial unit 8 not assembled to the vibration tool 100, the direction of the axis A3 is defined as the vertical direction, the protruding end side of the rotary shaft 822 is the upper side, and the main body 821 side is the lower side. It is defined as

  As shown in FIGS. 18 to 20, the collar 83 is formed in an annular shape and is arranged around the variable resistor 82 so as to be coaxial with the axis A <b> 3 of the rotating shaft 822. The collar 83 is configured so that a partition wall 88 to be described later can be attached. Specifically, a pair of locking recesses 831 that can be engaged with a pair of locking arms 882 of the partition wall 88 are provided on the outer periphery of the collar 83. The engagement between the partition wall 88 and the collar 83 will be described later. Further, a concave portion is formed in the inner peripheral portion of the collar 83 arranged around the rotary shaft 822, and an O-ring 832 is fitted into the concave portion. The O-ring 832 is configured to hold the dial 87 by frictional resistance while allowing the user to rotate the dial 87 steplessly. In addition, a restriction piece 833 that protrudes radially inward from a part of the inner periphery of the collar 83 is provided below the O-ring 832. The restricting piece 833 is configured to restrict the rotation of the dial 87 by abutting against a protrusion 872 (see FIG. 22) of the dial 87 described later.

  The circuit board 84 shown in FIG. 19 is formed in a substantially rectangular shape, and has a conductor connection region 841 in the region of one end portion in the longitudinal direction. The conductor connection area 841 is an area including a connection hole 842 to which the conductor 840 is connected. In the present embodiment, the circuit board 84 is provided with three connection holes 842 corresponding to the number of terminals of the variable resistor 82. The conducting wire 840 is electrically connected to the circuit board 84 by being inserted into each connection hole 842 and soldered to the circuit board 84. A variable resistor 82 and a collar 83 are fixed to a region of the circuit board 84 other than the conductor connection region 841. The terminal 825 of the variable resistor 82 is inserted into the connection hole 844 of the circuit board 84 and soldered, and electrically connected to the conductor 840 soldered to the connection hole 842 of the conductor connection region 841. Yes. When the vertical direction and the direction perpendicular to the longitudinal direction of the circuit board 84 (up and down direction in FIG. 20) are defined as the left and right direction of the speed change dial unit 8, the above-described state is obtained with the collar 83 fixed to the circuit board 84. The pair of locking recesses 831 are arranged symmetrically with respect to the center line of the collar 83 in the left-right direction.

  The case 85 is formed in a box shape that opens upward. The case 85 is configured as a container that accommodates the variable resistor 82, the collar 83, and the circuit board 84. The conductive wire 840, the variable resistor 82, and the collar 83 are arranged so as to protrude in the same direction from the same surface of the circuit board 84. The circuit board 84 is disposed inside the case 85 in a state in which the conductive wire 840, the variable resistor 82, and the collar 83 protrude upward from the opening of the case 85. The circuit board 84 is sealed with a resin 845 (typically an epoxy resin) injected into the case 85 in a state where the conducting wire 840, the variable resistor 82, and the collar 83 are mounted.

  As shown in FIGS. 17, 21, and 22, the dial 87 is a disk-shaped member that is turned by a user, and has a D-shaped cross section corresponding to the rotary shaft 822 at the center. A hole 871 is provided. The dial 87 is attached to the rotation shaft 822 by being fitted to the rotation shaft 822 in the direction of the axis A3. An annular stepped recess 873 that is recessed upward about the axis A3 is formed on the lower surface of the dial 87. An upper end portion of the collar 83 is inserted into the stepped recess 873, and an O-ring 832 is disposed between the collar 83 and the lower center portion of the dial 87. When the dial 87 is rotated, the dial 87 and the rotary shaft 822 are integrally rotated around the axis A3 while the lower center portion of the dial 87 slides on the O-ring 832. Thereby, the resistance value of the variable resistor 82 is changed. A protrusion 872 protruding downward toward the variable resistor 82 is provided in a part of the lower center portion of the dial 87 (see FIG. 22). When the dial 87 is rotated to a position where the protrusion 872 contacts the restriction piece 833 provided on the collar 83, further rotation of the dial 87 is restricted. That is, the rotation range of the dial 87 is limited to a certain angle range by the restriction piece 833 and the protrusion 872.

  The partition wall 88 is a wall portion configured to prevent contact between the dial 87 and the conductive wire 840 connected to the conductive wire connection region 841. In the present embodiment, the partition wall 88 is configured to be detachable from the collar 83. As shown in FIGS. 18, 23, and 24, the partition wall 88 includes a mounting portion 881, an interposition portion 884, and a retaining portion 887.

  The attachment portion 881 is a lower portion of the partition wall 88 arranged along the outer peripheral portion of the collar 83. Both ends of the mounting portion 881 in the circumferential direction of the collar 83 are configured as a pair of locking arms 882 having flexibility. The pair of locking arms 882 can be elastically deformed in the radial direction of the collar 83. The partition wall 88 is attached to the main body 81 (specifically, the collar 83) by the claw at the distal end of the locking arm 882 being locked to the locking recess 831 by elastic deformation of the locking arm 882. Yes.

  The interposition portion 884 is an upper portion of the partition wall 88 extending above the attachment portion 881 and is interposed between the outer peripheral portion of the dial 87 and the conductor 840 to prevent the dial 87 and the conductor 840 from contacting each other. Is configured to do. The interposition portion 884 extends from the attachment portion 881 along the lower surface of the dial 87 to the outside in the radial direction of the dial 87, and extends along the outer peripheral portion of the dial 87 to the upper end of the dial 87. Note that both end portions in the circumferential direction of the portion arranged along the outer peripheral portion of the dial 87 protrude in a direction away from the dial 87. The intervening portion 884 is disposed so as to overlap the conductive wire connection region 841 of the circuit board 84 when viewed from the extending direction of the axis A3 of the rotating shaft 822 (that is, viewed from the upper direction or the lower direction). In the present embodiment, the dial 87 is also disposed so as to overlap the conductor connection region 841. In other words, the interposition portion 884 and the dial 87 are arranged so that at least a part thereof is included in the region directly above the conductor connection region 841.

  For this reason, as shown in FIG. 21, the conductive wire 840 connected to the connection hole 842 and sealed with the resin 845 in the case 85 extends upward from the conductive wire connection region 841 and is exposed from the resin 845. . Above this, an interposition portion 884 of the partition wall 88 is disposed along the outer peripheral portion from the lower surface of the dial 87. Therefore, when the conducting wire 840 extends upward as it is, the interposition portion 884 is interposed between the dial 87 and the contact with the dial 87 is prevented. For this reason, the conducting wire 840 is bent below the interposition part 884 and extends on the outer peripheral side of the interposition part 884. In addition, the both ends of the circumferential direction of the part arrange | positioned along the outer peripheral part of the dial 87 among the interposition parts 884 function as a guide part which guides so that the conducting wire 840 may not deviate in the left-right direction (refer FIG. 17). .

  The retaining portion 887 protrudes from the upper end of the interposition portion 884 toward the axis A3 (inward in the radial direction of the dial 87), and is disposed slightly above the upper surface of the dial 87. This restricts the dial 87 fitted to the rotating shaft 822 from moving upward (in the protruding direction of the rotating shaft 822). That is, the retaining portion 887 prevents the dial 87 from coming off the rotating shaft 822.

  According to the speed change dial unit 8 configured as described above, the conducting wire 840 can be protected by the partition wall 88 (particularly, the interposition portion 884) disposed so as to prevent the contact between the dial 87 and the conducting wire 840. In the present embodiment, attention is paid to the fact that a dead space is likely to be generated on the circuit board 84 side with respect to the rotation axis direction (axis A3) of the dial 87, and at least one of the dial 87 and the partition wall 88 is seen in the axis A3 direction. Conductive wire connection region 841 is arranged so as to overlap. Accordingly, as shown in FIG. 21, the conductor 840 can be protected by blocking the contact between the conductor 840 and the dial 87 by the partition wall 88 while allowing the conductor 840 to pass through this dead space. . Thereby, the structure which protects the conducting wire 840 can be provided, avoiding the enlargement of the speed change dial unit 8 in radial direction.

  Note that the transmission dial unit 8 can be specifically manufactured by a manufacturing method (assembly method) including the following first to fifth steps. In the first step, the circuit board 84 on which the variable resistor 82 and the collar 83 are mounted and the conductor 840 is connected to the conductor connection region 841 is accommodated in the case 85 opened upward (see FIG. 25). In the second step, the uncured resin 845 extends from the upper opening of the case 85 to a height position where at least the connection portion of the conductor 840 to the conductor connection region 841 and the connection portion of the terminal 825 of the variable resistor 82 are buried. Injected into the case 85 (see FIG. 19). In the third step, the resin 845 is cured. In the fourth step, the dial 87 is attached to the rotating shaft 822 by fitting the rotating shaft 822 of the variable resistor 82 into the fitting hole 871 of the dial 87 (see FIGS. 18 and 26). In the fifth step, the partition wall 88 is attached to the collar 83 from the lateral direction by locking the pair of locking arms 882 to the locking recess 831 using elastic deformation (FIGS. 17, 18, and 21). reference).

  According to this manufacturing method, when the conductor 840 is connected to the connection hole 842 in the previous stage of the first step, a space for connection work (typically soldering) is provided in the vicinity of the conductor connection region 841. Space for placing the instrument) is required. Further, in the second step, when an injection operation in which the resin 845 is injected from the opening above the case 85 is performed, a space for placing an injection device for the resin 845 is required above the case 85. Become. On the other hand, in the present embodiment, the dial 87 and the partition wall 88 are not attached to the main body portion 81 in the stage before the first step or the second step, and a sufficient space is provided above the conductor connection region 841. Therefore, necessary work can be easily performed.

  Further, in the fifth step, the partition wall 88 including the interposition portion 884 that prevents the contact between the dial 87 and the conducting wire 840 simply by elastically deforming the pair of locking arms 882 and locking the locking recesses 831 with each other, 81 can be attached. Further, in the fourth step, the rotary shaft 822 is fitted into the fitting hole 871 of the dial 87, and in the fifth step, the partition wall 88 is attached from the lateral direction using the elastic deformation of the pair of locking arms 882. Thus, the dial 87 can be connected to the rotary shaft 822 so that it can rotate integrally with the rotary shaft 822 and is prevented from coming off from the rotary shaft 822. That is, the dial 87 and the partition wall 88 can be assembled to the main body 81 without using a fixing tool such as a screw. Thereby, the work efficiency at the time of the assembly of the transmission dial unit 8 can be improved, and the component cost can be suppressed.

  The correspondence between each component of the present embodiment and each component of the present invention is shown below. The vibration tool 100 is a configuration example corresponding to the “work tool” of the present invention. The outer housing 2 and the inner housing 3 are configuration examples corresponding to the “outer housing” and the “inner housing” of the present invention, respectively. The motor 53, the output shaft 531, and the axis A2 are configuration examples corresponding to the “motor”, “output shaft”, and “first axis” of the present invention, respectively. The spindle 51 and the axis A1 are configuration examples corresponding to the “spindle” and the “second axis” of the present invention, respectively. The transmission mechanism 55 is a configuration example corresponding to the “transmission mechanism” of the present invention. The front end portion 31, the rear end portion 33, the extending portion 35, and the elastic connecting portion 37 of the inner housing 3 are respectively “first end portion”, “second end portion”, and “extending portion” of the present invention. This is a configuration example corresponding to the “elastic connecting portion”. The front elastic member 71 is a configuration example corresponding to the “first elastic member” of the present invention. The battery mounting portion 331 is a configuration example corresponding to the “power supply related device” and the “battery mounting portion” of the present invention. The battery 93 is a configuration example corresponding to the “battery” of the present invention. The four elastic ribs 371 are configuration examples corresponding to “a plurality of second elastic members” of the present invention.

  The grip part 25 is a configuration example corresponding to the “grip part” of the present invention. The rear elastic member 76 is a configuration example corresponding to the “third elastic member” of the present invention. The internal space 370 is a configuration example corresponding to the “internal space of the elastic coupling portion” of the present invention. The switch holder 20 is a configuration example corresponding to “a part of the outer housing disposed in the inner space” and “switch holding member” of the present invention. The upper shell 27 and the lower shell 28 are structural examples corresponding to the “cover portion that covers the inner housing of the outer housing” of the present invention. The left shell 391 and the right shell 392 are configuration examples corresponding to the “left part” and the “right part” of the present invention, respectively. The intermediate elastic member 78 is a structural example corresponding to the “fourth elastic member” of the present invention.

[Second Embodiment]
With reference to FIG. 27, the vibration tool 101 according to the second embodiment will be described. The vibration tool 101 of the present embodiment, like the vibration tool 100 (see FIG. 2) of the first embodiment, causes the spindle 51 to move around the axis A1 within a predetermined angle range by the power of the motor 53 configured as a brushless DC motor. It is configured to reciprocate. However, as a power source for the vibration tool 101, an external AC power source (commercial power source) is used instead of the battery 93 mounted on the battery mounting unit 331. For this reason, the rear end portion 330 and the internal structure of the inner housing 30 of the vibration tool 101 are different from the rear end portion 33 and the internal structure of the first embodiment. The rest of the configuration of the vibration tool 101 is substantially the same as that of the vibration tool 100 of the first embodiment. Accordingly, in the following description, substantially the same configuration is denoted by the same reference numeral, illustration and description thereof are omitted or simplified, and different configurations are mainly described.

  Like the housing 1 of the vibration tool 100, the vibration tool 101 includes a housing 10 configured as a so-called vibration-proof housing. The housing 10 includes a long outer housing 2 and a long inner housing 30 accommodated in the outer housing 2. The inner housing 30 includes a front end portion 31, an extending portion 35, an elastic connecting portion 37 (four elastic ribs 371) (see FIG. 2), and a rear end portion 330 (see FIG. 27).

  In the first embodiment described above, the rear end portion 33 is provided with the battery mounting portion 331 as a power-related device that enables power supply from the battery 93 to the motor 53 (see FIG. 2). On the other hand, in the present embodiment, a power-related device that enables power supply from the external AC power source to the motor 53 is arranged at the rear end portion 330. Specifically, as shown in FIG. 27, a power cable 95 that can be connected to an AC power supply extends from the rear end of the rear end portion 330. In addition, an AC-DC converter 41 that is connected to the power cable 95 and converts alternating current into direct current is housed inside the rear end portion 330.

  In the present embodiment, the AC-DC converter 41 converts direct current into alternating current, and controls the driving of the motor 53 via the three-phase inverter 42 and the three-phase inverter 42 that drives the motor 53 using a switching element. The control unit 40 is configured together with the CPU 43. Among the components of the control unit 40, the AC-DC converter 41 has the largest weight. In the present embodiment, the weight of the AC-DC converter 41 is equal to the weight of the battery 93 of the first embodiment. Note that at least one of the three-phase inverter 42 and the CPU 43 may be accommodated not in the rear end portion 330 but in a region near the motor 53.

  In the present embodiment, the spindle 51, the motor 53, and the transmission mechanism 55, which are heavy objects in the vibration tool 101, are concentrated on the front end 31, while the AC-DC converter 41 corresponding to the AC-DC converter 41 is provided on the rear end 330. A configuration in which a heavy object is accommodated is employed. In the present embodiment, in addition to the AC-DC converter 41, the three-phase inverter 42 and the CPU 43 are accommodated in the rear end portion 330, so that the weight of the internal structure of the rear end portion 330 is further increased. With such a configuration, the inertia moment of the inner housing 30 can be increased similarly to the mounting of the battery 93 in the first embodiment, and therefore the vibration itself generated in the inner housing 30 can be reduced. Further, even when a certain load is applied to the tip tool 91, the inner housing 30 can be prevented from being unnecessarily rotated about the spindle 51 with respect to the outer housing 2.

  In the present embodiment, the vibration tool 101 is a configuration example corresponding to the “work tool” of the present invention. The inner housing 30 is a configuration example corresponding to the “inner housing” of the present invention. The rear end portion 330 is a configuration example corresponding to the “second end portion” of the present invention. The power cable 95 and the AC-DC converter 41 are configuration examples corresponding to the “power-related device” of the present invention. The power cable 95 and the AC-DC converter 41 are configuration examples corresponding to the “cable” and “converter” of the present invention, respectively. The three-phase inverter 42 and the CPU 43 are configuration examples corresponding to the “inverter” and the “control unit” of the present invention, respectively.

  The above embodiment is merely an example, and the work tool according to the present invention is not limited to the configuration of the illustrated vibration tools 100 and 101. For example, the changes exemplified below can be added. It should be noted that only one or a plurality of these changes can be employed in combination with the vibration tools 100 and 101 shown in the embodiments or the invention described in each claim.

  The number, shape, and arrangement position in the circumferential direction of the elastic ribs 371 provided on the elastic connecting portions 37 of the inner housings 3 and 30 may be appropriately changed. For example, the number of elastic ribs 371 may be any number among 2, 3, and 5 or more. However, when the inner housing 3 includes a plurality of components divided in the left-right direction, such as the left shell 391 and the right shell 392, two or more elastic ribs 371 are provided in each component. Is preferred. In the case where a part of the outer housing 2 elastically connected to the rear end portion 33 is disposed in the internal space 370 as in the above embodiment, the size of the part and the adjacent elastic rib 371 The number, shape, and arrangement position in the circumferential direction of the elastic ribs 371 may be determined in consideration of the size of the opening formed therebetween.

  Note that a part of the outer housing 2 disposed in the internal space 370 is not limited to the switch holder 20, and may be a part having only a function of elastically connecting to the rear end part 33, or other functions. It may be a portion (for example, a holder that holds only the transmission dial unit 8). In addition, a part of the outer housing 2 disposed in the internal space 370 is not necessarily configured as a separate member and need not be fixed to the upper shell 27 and the lower shell 28 (that is, the cover portion covering the inner housing 3). Alternatively, it may be a part protruding from the upper shell 27 or the lower shell 28 into the internal space 370. Alternatively, the inner portion of the rear end portion 23 and the rear end portions 33 and 330 may be connected via the rear elastic member 76 instead of the portion arranged in the internal space 370.

  In addition, the elastic rib 371 of the above-described embodiment is formed of a synthetic resin having a belt shape and flexibility, and having a lower elastic coefficient than other portions. Thus, when the elastic rib 371 and the front-end part 31, the extension part 35, and the rear-end parts 33 and 330 can be integrally molded, it is preferable from the viewpoint of ease of assembly and manufacturing cost. However, for example, a configuration in which the extending portion 35 and the rear end portions 33 and 330 are elastically connected by a rubber element or a spring element formed as a separate body may be employed. If the elastic rib 371 is configured to have elasticity (for example, if it is formed in a shape that is easily elastically deformed as in the above embodiment), the front end portion 31, the extending portion 35, and The rear end portions 33 and 330 may be made of the same material. In addition, as long as at least a part of the elastic rib 371 is formed of a material having a low elastic modulus, it is not necessary to form the elastic rib 371 in a shape that is more easily elastically deformed than other parts as in the above embodiment.

  Similar to the elastic ribs 371, the numbers, shapes, and positions of the front elastic members 71 and the rear elastic members 76 are relative to the outer housing 2 and the inner housings 3, 30 in all directions (front / rear, left / right, vertical direction). As long as it can be elastically connected so as to be movable, it can be appropriately changed. In the first embodiment, from the viewpoint of stabilizing the arrangement relationship between the battery 93 and the outer housing 2, the rear end portion 33 is connected to the outer housing 2 via the rear elastic member 76. Although it is preferable, the rear elastic member 76 is not necessarily provided. Also in the second embodiment, the rear elastic member 76 may be omitted. The intermediate elastic member 78 can also be omitted. Moreover, in the said embodiment, although the front side elastic member 71, the back side elastic member 76, and the intermediate | middle elastic member 78 are formed with the same material (ultra fine cell polyurethane elastomer), even if each is formed with a different material. It may be configured as a different element such as a rubber element or a spring element.

Furthermore, in view of the gist of the present invention and the above-described embodiment and its modifications, the following aspects are constructed. The following modes can be employed in combination with the vibration tools 100 and 101 shown in the embodiments, the above-described modified examples, or the invention described in each claim.
[Aspect 1]
Each of the plurality of second elastic members may be configured as a member having flexibility.
[Aspect 2]
The plurality of second elastic members may be arranged in plane symmetry with respect to a virtual plane including the first axis and the second axis.
[Aspect 3]
In the elastic connecting portion, the internal space and the outside communicate with each other through openings formed between the plurality of second elastic members in the circumferential direction.
The opening may constitute a connection path when the part of the outer housing disposed in the internal space and the second end are connected via the third elastic member.

100, 101: Vibration tool 1: Housing 2: Outer housing 21: Front end portion 23: Rear end portion 25: Center portion (gripping portion)
27: Upper shell 271: Cylindrical portion 273: Cylindrical portion 275: Through hole 28: Lower shell 281: Through hole 283: Through hole 20: Switch holder 202: Body portion 203: First holding portion 204: First arm portion 205 : Tip part 206: cylindrical part 207: screw 209: dial holding part 29: switch 290: slider 291: switch lever 292: rotating part 293: interlocking part 3, 30: inner housing 31: front end part 311: motor cover part 312 : Lower end surface 313: screw hole 33, 330: rear end 331: battery mounting portion 332: control unit accommodation portion 333: second holding portion 334: second arm portion 335: protruding portion 35: extending portion 353: step portion 37: Elastic connecting portion 370: Internal space 371: Elastic rib 38: Metal housing 380: First contact surface 381: Spindle receiving portion 382 Concave portion 383: motor housing portion 384: upper end surface 385: screw insertion portion 386: screw 387: contact portion 388: through hole 389: screw 39: resin housing 390: second contact surface 391: left shell 392: right shell 394 : Protruding part 395: Large diameter part 396: Small diameter part 397: Through hole 398: Screw hole 4 and 40: Control unit 41: AC-DC converter 42: Three-phase inverter 43: CPU
5: Tip tool drive mechanism 51: Spindle 511: Tool mounting part 52: Clamp shaft 521: Clamp head 523: Groove part 53: Motor 531: Output shaft 55: Transmission mechanism 551: Eccentric shaft 553: Swing arm 555: Drive bearing 6 : Lock mechanism 61: Operation lever 62: Rotating shaft 621: Eccentric part 63: Compression coil spring 65: Collar 67: Clamp member 671: Projection part 71: Front side elastic member 711: Through hole 72: Connection member 721: Base part 724 : Cylindrical part 725: Protruding part 726: Screw 76: Rear elastic member 761: Through hole 78: Intermediate elastic member 8: Transmission dial unit 81: Main body part 82: Variable resistor 821: Main body 822: Rotating shaft 825: Terminal 83 : Collar 831: Locking recess 832: O-ring 833: Restriction piece 84: Circuit board 840: Guide 841: Conductor connection area 842: Connection hole 844: Connection hole 85: Case 87: Dial 871: Fitting hole 872: Protrusion 873: Stepped recess 88: Partition wall 881: Mounting portion 882: Locking arm 884: Interposition portion 887: Retaining portion 91: Tip tool 93: Battery A1: Axis A2: Axis A3: Axis OP: Oscillating surface VP: Vertical surface

Claims (13)

A work tool that drives a tip tool to perform a machining operation on a workpiece,
Outauding formed in a long shape,
An inner housing formed in an elongated shape and housed in the outer housing;
A motor having an output shaft rotatable about a first axis that extends across the major axis of the inner housing;
A spindle configured to be detachable from the tip tool and rotatably supported around a second axis extending in parallel with the first axis;
A transmission mechanism configured to transmit the rotational movement of the output shaft to the spindle, and to reciprocately rotate the spindle within a predetermined angular range around the second axis;
The inner housing is
A first end which is one end in the longitudinal direction;
A second end which is the other end in the long axis direction;
An extension formed integrally with the first end and extending in the longitudinal direction towards the second end;
An elastic connection part that elastically connects the extension part and the second end part;
The motor, the spindle, and the transmission mechanism are disposed at the first end of the inner housing,
The first end is connected to the outer housing via a first elastic member,
The second end has a power supply-related device that enables power supply from a power supply to the motor,
The elastic connecting part includes a plurality of second elastic members that connect the extending part and the second end part,
The work tool, wherein the plurality of second elastic members are spaced apart from each other in a circumferential direction around the major axis direction. The work tool according to claim 1,
The work tool according to claim 1, wherein the power-related device is a battery mounting portion configured to be detachable from a battery as the power source. The work tool according to claim 1,
The power supply related device is:
A cable connectable to an external AC power source as the power source;
And a converter connected to the cable and configured to convert alternating current to direct current. The work tool according to claim 3,
An inverter configured to convert the direct current converted by the converter into alternating current and drive the motor;
A control unit configured to control driving of the motor via the inverter;
The work tool, wherein the inverter and the control unit are arranged at the second end. The work tool according to any one of claims 1 to 4,
The outer housing includes a grip portion configured to be gripped by a user,
The extension part is a part of the inner housing corresponding to at least a part of the grip part. The work tool according to any one of claims 1 to 5,
The work tool, wherein the plurality of second elastic members are formed to have an elastic coefficient lower than that of the extending portion and the second end portion. The work tool according to any one of claims 1 to 6,
The work tool, wherein the second end is connected to the outer housing via a third elastic member. The work tool according to claim 7,
The outer housing includes a portion disposed in an internal space of the elastic coupling portion surrounded by the plurality of second elastic members,
5. The work tool according to claim 4, wherein the second end portion is connected to the part disposed in the internal space via the third elastic member. The work tool according to claim 8,
The part of the outer housing disposed in the inner space is formed as a separate member from the cover part of the outer housing that covers the inner housing, and is fixed to the cover part. A featured work tool. The work tool according to claim 8 or 9, wherein
The work tool, wherein the part of the outer housing disposed in the inner space is a switch holding member that holds a switch for driving the motor. The work tool according to any one of claims 1 to 10,
The work tool, wherein the first elastic member is formed of a material having an ultrafine foam structure. The work tool according to any one of claims 1 to 11,
When the major axis direction is defined as the front-rear direction, the extending direction of the first axis and the second axis is defined as the up-down direction, and the direction intersecting the front-rear direction and the up-down direction is defined as the left-right direction. Is formed by connecting the left part and the right part,
The plurality of second elastic members include at least two second elastic members connected to the left side portion and at least two second elastic members connected to the right side portion. The work tool according to any one of claims 1 to 12,
A fourth elastic member disposed between the inner housing and the outer housing and configured to restrict relative movement of the inner housing in the reciprocating rotation direction of the spindle with respect to the outer housing; Work tool provided.

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