JP2018167343A - Working tool - Google Patents

Abstract

To provide a simple and rational connection structure for a component part of a housing of a working tool.SOLUTION: A vibration tool includes: a motor 53; a spindle which swings a tip tool 91, and an inner housing 3 which stores the motor 53 and the spindle. The inner housing 3 is formed into a long shape extending in approximately front/rear direction, and includes at least a metal housing 38 storing the spindle, and a resin housing 39 which is connected to the rear end of the metal housing 38 and extends to the rear part. The metal housing 38 and the resin housing 39 each includes a contact part 387 and a projection 394. The contact part 387 and the projection 394 each has at least one first contact surface 380 and at least one second contact surface 390 which cross each other on a swing surface of the tip tool 91. The contact part 387 and the projection 394 are connected to each other in a state where a first contact surface 380 and a second contact surface 390 are brought into contact with each other.SELECTED DRAWING: Figure 6

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 that performs a machining operation on a workpiece by swinging a tip tool attached to the lower end of a spindle is known. In such a work tool, the spindle and the motor are accommodated in the housing, but the structure of the housing is various. For example, in the work tool disclosed in Patent Document 1, the motor is housed in the housing such that its axis coincides with the long axis direction of the long housing, and the spindle is one end of the long axis direction of the housing. The part is housed in such a manner that its axis is perpendicular to the axis of the motor. The housing is composed of two elongated shells divided along a direction parallel to the swing surface of the tip tool.

International Publication No. 2012/045679

  In the work tool described above, the contact portions of the two shells constituting the housing are provided with a convex portion and a concave portion over almost the entire circumference, and the two shells are connected by their engagement. Therefore, defective assembly is likely to occur unless the molding accuracy of the constituent parts of the housing is kept high.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a simple and rational connection structure with respect to the components of the housing of the 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. This work tool includes a motor, a spindle, and a housing.

  The motor has an output shaft that is rotatable about a first axis. The spindle includes a tool mounting portion configured to be detachable from the tip tool. Further, the spindle reciprocates within a predetermined angular range around a second axis parallel to the first axis by the power of the motor, so that the tip tool mounted on the tool mounting portion is moved to the second axis. It is configured to swing within a swing plane orthogonal to the axis. The housing is formed in a long shape and accommodates the motor and the spindle.

  Further, when the longitudinal direction of the housing is defined as the front-rear direction, the housing includes at least a front housing portion that accommodates the spindle, and a rear housing portion that is connected to the rear end portion of the front housing portion and extends rearward. Including. The front housing portion includes a first contact portion having at least one first contact surface that intersects the swing surface. On the other hand, the rear housing portion includes a second contact portion having at least one second contact surface that intersects the swing surface. And the 1st contact part and the 2nd contact part are connected in the state where at least 1 1st contact surface and at least 1 2nd contact surface contacted mutually.

  In a work tool that swings the tip tool mounted on the spindle within the swing plane, vibration is generated in the front housing part that houses the spindle. The most dominant of these is vibration in the swing direction of the tip tool. is there. On the other hand, according to this aspect, the first contact portion and the second contact portion are connected in a state where the first contact surface and the second contact surface intersecting the swing surface are in contact with each other. By doing so, it is possible to connect the two while effectively suppressing the relative movement of the front housing and the rear housing in the swing direction. Moreover, since it is possible to suppress the occurrence of relative slip between the first contact surface and the second contact surface, it is possible to effectively suppress the generation of heat generation and abnormal vibration. Thus, according to this aspect, a simple and rational connection structure between the front housing portion and the rear housing portion can be realized.

  According to one aspect of the present invention, when the extending direction of the first axis and the second axis is defined as the up-down direction, and the front-rear direction and the direction perpendicular to the up-down direction are defined as the left-right direction, at least one first contact The contact surface and the at least one second contact surface may be arranged so as to intersect in the left-right direction, respectively. According to this aspect, it is possible to connect the first contact portion and the second contact portion while suppressing an increase in the size of the housing.

  According to one aspect of the present invention, the motor may be accommodated behind the spindle of the front housing portion. When the motor is housed in the front housing portion together with the spindle, the vibration of the front housing portion tends to become intense, but the relative movement between the front housing and the rear housing is effectively suppressed by the first contact portion and the second contact portion. be able to.

  According to one aspect of the present invention, the first contact portion may be disposed behind the motor. If the first contact portion is arranged at a position overlapping the motor (that is, on the side of the motor), the second contact portion is connected to the first contact portion, so that the housing is easily increased in size in the left-right direction. On the other hand, according to this aspect, by arranging the first contact portion behind the motor, the first contact portion and the second contact portion are connected without increasing the size of the housing in the left-right direction. can do.

  According to one aspect of the present invention, the front housing portion and the rear housing portion may each have a first mating surface and a second mating surface that are parallel to the swing surface. In the case where the first mating surface and the second mating surface parallel to the swinging surface of the tip tool are provided, there is a possibility that heat will be generated when both of them slide. On the other hand, according to this aspect, the first contact portion and the second contact portion prevent the front housing portion and the rear housing portion from relatively moving in the swinging direction. The possibility of heat generation can be effectively reduced.

  According to one aspect of the present invention, the rear housing part may include a left part and a right part divided in the left-right direction. The second contact portion may include a left contact portion provided in the left portion and a right contact portion provided in the right portion. The at least one first contact surface includes a left first contact surface provided on the left side of the first contact portion and a right first contact surface provided on the right side of the first contact portion. May be included. The at least one second contact surface may include a left second contact surface provided on the left contact portion and a right second contact surface provided on the right contact portion. The first contact portion and the second contact portion are sandwiched between the left contact portion and the right contact portion so that the left first contact surface and the left second contact surface contact each other. In addition, the right first contact surface and the second right contact surface may be fixed with screws.

  According to this aspect, as the region where the first contact surface and the second contact surface contact, the region where the left first contact surface and the left second contact surface contact, and the right first contact surface And two areas of the area where the right second contact surface abuts. For this reason, compared with the case where a 1st contact surface and a 2nd contact surface contact | abut only at one place, it suppresses more reliably that a front side housing part and a rear side housing part move relatively in a rocking | fluctuation direction. be able to. Further, the first contact portion is sandwiched between the left portion and the right portion and fixed with screws, thereby realizing a strong connection structure between the first contact portion and the second contact portion.

  According to an aspect of the present invention, the work tool may further include an outer housing that covers the housing. The housing and the outer housing may be coupled via an elastic member. According to this aspect, vibration generated in the housing can be suppressed from being transmitted to the outer housing that is touched by the user.

It is a whole perspective view of a vibration tool. 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.

  Hereinafter, embodiments will be described with reference to the drawings. In the following embodiments, an electric vibration tool 100 that performs a machining operation on a workpiece (not shown) by driving the tip tool 91 in a swinging manner is illustrated 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. The two through holes 388 are arranged at positions offset from each other in the left-right 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 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, the tool mounting portion 511, the axis A1, and the swing surface OP are configuration examples corresponding to the “spindle”, “tool mounting portion”, “second axis”, and “swing surface” of the present invention, respectively. is there. The inner housing 3, the metal housing 38, and the resin housing 39 are structural examples corresponding to the “housing”, “front housing portion”, and “rear housing portion” of the present invention, respectively. The contact portion 387 and the first contact surface 380 are configuration examples corresponding to the “first contact portion” and the “first contact surface” of the present invention, respectively. The protruding portion 394 (large diameter portion 395) and the second contact surface 390 are configuration examples corresponding to the “second contact portion” and the “second contact surface” of the present invention, respectively.

  The upper end surface 384 of the motor housing portion 383 is a configuration example corresponding to the “first mating surface” of the present invention. The lower end surface 312 of the motor cover portion 311 is a configuration example corresponding to the “second mating surface” of the present invention. The left shell 391 and the right shell 392 are configuration examples corresponding to the “left part” and “right part” of the present invention, respectively. The protruding portion 394 (large diameter portion 395) of the left shell 391 is a configuration example corresponding to the “left contact portion” of the present invention. The protruding portion 394 (large diameter portion 395) of the right shell 392 is a configuration example corresponding to the “right contact portion” of the present invention. The first contact surface 380 as the left side surface of the contact portion 387 is a configuration example corresponding to the “left first contact surface” of the present invention. The first contact surface 380 as the right side surface of the contact portion 387 is a configuration example corresponding to the “right first contact surface” of the present invention. The second contact surface 390 of the left shell 391 is a configuration example corresponding to the “left second contact portion” of the present invention. The second contact surface 390 of the right shell 392 is a configuration example corresponding to the “right second contact portion” of the present invention. The outer housing 2 is a configuration example of the “outer housing” in the present invention. Each of the front elastic member 71 and the rear elastic member 76 is a configuration example of the “elastic member” of the present invention.

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

  The connection structure between the metal housing 38 and the resin housing 39 is not limited to the contact portion 387 and the protruding portion 394, and can be changed as appropriate. For example, the size and shape of the contact portion 387 may be changed as long as the contact portion 387 includes a contact surface that intersects the left-right direction that is the swinging direction of the tip tool 91. In this case, the resin housing 39 may be provided with a portion including a surface that contacts the contact surface of the metal housing 38. In the above embodiment, the second contact surfaces 390 of the two protruding portions 394 of the left shell 391 and the right shell 392 with respect to the two first contact surfaces 380 that are the left side surface and the right side surface of the contact portion 387. The two projecting portions 394 are in contact with the second contact surface 390. That is, a plurality of first contact surfaces 380 and second contact surfaces 390 are provided, and are in contact with each other at a plurality of positions. However, the contact surface of the metal housing 38 and the contact surface of the resin housing 39 may be one each. The contact surface of the metal housing 38 and the contact surface of the resin housing 39 may be flat or curved. In addition, the contact surface of the metal housing 38 and the contact surface of the resin housing 39 may intersect with the swinging direction of the tip tool 91, but it is preferable that the contact surface is generally orthogonal.

  Further, other configurations and internal structures of the metal housing 38 and the resin housing 39 can be appropriately changed. For example, in the embodiment described above, the opening above the motor housing portion 383 in the metal housing 38 may be covered with a portion of the metal housing 38 instead of the motor cover portion 311 that is a portion of the resin housing 39. Further, the resin housing 39 is not necessarily divided into the left shell 391 and the right shell 392 but may be formed in a cylindrical shape and connected to the rear end portion of the metal housing 38. Further, from the viewpoint of suppressing vibration transmission to the grip portion 25, the housing 1 preferably has a two-layer structure of an inner housing 3 and an outer housing 2 elastically connected to the inner housing 3. A single-layer structure may be used.

100: 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 portion 206: cylindrical portion 207: screw 209: dial holding portion 29: switch 290: slider 291: switch lever 292: rotating portion 293: interlocking portion 3: inner housing 31: front end portion 311: motor cover portion 312: bottom End surface 313: Screw hole 33: Rear end portion 331: Battery mounting portion 332: Control unit accommodation portion 333: Second holding portion 334: Second arm portion 335: Projection portion 35: Extension portion 353: Step portion 37: Elastic connection Portion 370: Internal space 371: Elastic rib 38: Metal housing 380: First contact surface 381: Spindle receiving portion 382: Recess 383: Data storage 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: protrusion Part 395: Large diameter part 396: Small diameter part 397: Through hole 398: Screw hole 4: Control unit 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: Oscillating arm 555: Drive bearing 6: Lock mechanism 61: Operation lever 62: Rotating shaft 621: Eccentric portion 63: Compression coil spring 65: Collar 67: Clamp member 671 : Protrusion 71: front elastic member 711: through hole 72: connecting member 721: base portion 724: cylinder 725: Protruding portion 726: Screw 76: Rear elastic member 761: Through hole 78: Intermediate elastic member 8: Transmission dial unit 81: Main body portion 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: Conductor 841: Conductor connection area 842: Connection hole 844: Connection hole 85: Case 87: Dial 871: Fitting hole 872: Protrusion 873: Stepped Recess 88: Septum 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 (7)

A work tool that drives a tip tool to perform a machining operation on a workpiece,
A motor having an output shaft rotatable about a first axis;
A tool mounting portion configured to allow the tip tool to be attached and detached, and reciprocatingly rotated within a predetermined angle range around a second axis parallel to the first axis by the power of the motor; A spindle configured to oscillate the tip tool mounted on the tool mounting portion within an oscillating plane perpendicular to the second axis;
An elongated housing for housing the motor and the spindle,
When the longitudinal direction of the housing is defined as the front-rear direction, the housing includes at least a front housing portion that houses the spindle, and a rear housing portion that is connected to a rear end portion of the front housing portion and extends rearward. Including
The front housing portion includes a first abutting portion having at least one first abutting surface intersecting the swing surface,
The rear housing portion includes a second contact portion having at least one second contact surface intersecting the swing surface,
The first contact portion and the second contact portion are connected in a state where the at least one first contact surface and the at least one second contact surface are in contact with each other. Work tool to do. The work tool according to claim 1,
When the extending direction of the first axis and the second axis is defined as the vertical direction, and the direction orthogonal to the front-rear direction and the vertical direction is defined as the left-right direction, the at least one first contact surface and the at least one Each of the second contact surfaces is arranged so as to intersect with the left-right direction, respectively. The work tool according to claim 1 or 2,
The work tool, wherein the motor is housed behind the spindle of the front housing portion. The work tool according to claim 3,
The work tool, wherein the first contact portion is disposed behind the motor. The work tool according to any one of claims 1 to 4,
The work tool, wherein the front housing portion and the rear housing portion each have a first mating surface and a second mating surface parallel to the swing surface. The work tool according to any one of claims 1 to 5,
The rear housing part includes a left part and a right part divided in the left-right direction,
The second contact portion includes a left contact portion provided in the left portion and a right contact portion provided in the right portion,
The at least one first contact surface includes a left first contact surface provided on a left side portion of the first contact portion and a right first contact surface provided on a right side portion of the first contact portion. Including a surface,
The at least one second contact surface includes a left second contact surface provided in the left contact portion and a right second contact surface provided in the right contact portion,
The first contact portion and the second contact portion are configured such that the first contact portion is sandwiched between the left contact portion and the right contact portion, and the left first contact surface and the left second contact portion. A work tool, which is fixed by a screw in a state in which the contact surface is in contact and the right first contact surface and the second right contact surface are in contact. The work tool according to any one of claims 1 to 6,
An outer housing covering the housing;
The work tool, wherein the housing and the outer housing are connected via an elastic member.

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