JP7282659B2 - Work tools - Google Patents

Description

TECHNICAL FIELD The present invention relates to a work tool that performs a machining operation on a workpiece by oscillating a tip tool.

2. Description of the Related Art A working tool (so-called vibrating tool) is known that performs a machining operation on a workpiece by swinging a tip tool attached to a spindle within a predetermined angle range. In such a vibrating tool, the contact area between the spindle and the tip tool is an inclined surface extending in a direction intersecting the rotation axis of the spindle for the purpose of easily absorbing the torque introduced to the tip tool. It is known that (see Patent Literature 1).

Japanese Patent Publication No. 2016-529118

In the vibration tool described above, when the tip tool is firmly fixed to the spindle and driven to oscillate, the spindle and the tip tool may become stuck in the contact area (inclined surface), making it difficult to remove the tip tool. be. Therefore, the vibration tool described above has room for improvement in terms of removal of the tip tool.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a technique that contributes to easy detachment of a tip tool in a work tool in which the tip tool is oscillatingly driven.

According to one aspect of the present invention, there is provided a work tool that performs a machining operation on a workpiece by oscillatingly driving a tip tool. The work tool includes a housing, a spindle, a clamp shaft, a first biasing member, an engaging member, a first retaining member, an operating member and a depression member.

The spindle has a cylindrical shape and is supported by the housing so as to be rotatable around the drive shaft. The drive shaft defines the vertical direction of the work tool. The spindle has a tool attachment section at its lower end to which a tip tool can be attached and detached. A clamp shaft is arranged coaxially with and detachable from the spindle. The first biasing member is configured to bias the clamp shaft upward toward a clamping position where the lower end of the clamp shaft and the tool mounting portion clamp the tip tool. The engagement member is configured to engage the clamp shaft and retain the clamp shaft in the clamped position. The first holding member holds the engaging member so as to be relatively movable in the vertical direction between a first position and a second position. The engagement member radially immovably engages the clamp shaft in the first position. Also, the engaging member is radially movable in the second position. The operation member is configured to be externally operable by the user. The push-down member is arranged so as to be vertically movable with respect to the spindle. The tool mounting portion has a first inclined surface that is inclined with respect to the drive shaft. A second inclined surface provided on the tool bit is pressed against the first inclined surface when the tool bit is clamped. The operating member is configured to move one of the engaging member and the first holding member downward relative to the other and the spindle in response to a predetermined releasing operation. The engaging member is configured to move from the first position to the second position with respect to the first holding member in conjunction with the releasing operation. The one of the engaging member and the first holding member is configured to push down the tip tool via the push-down member during the downward movement process.

In the work tool of this aspect, the tip tool is clamped with the second inclined surface pressed against the first inclined surface of the tool mounting portion, and is firmly fixed to the spindle. If the tip tool is oscillatingly driven in such a state, the tip tool may stick to the tool mounting portion. In contrast, in the work tool of this aspect, one of the engaging member and the first holding member moves downward relative to the other and the spindle in conjunction with the release operation of the operating member. This causes the engaging member to move from the first position where it engages the clamp shaft to the second position where it can move radially with respect to the first holding member. That is, the engagement of the engaging member with respect to the clamp shaft can be released in conjunction with the releasing operation of the operating member. Further, one of the engaging member and the first holding member pushes down the tip tool through the pushing member in the process of moving downward. Therefore, even if the tip tool is fixed to the tool mounting portion, the user can easily remove the tip tool together with the clamp shaft simply by releasing the operating member.

In this aspect, the first inclined surface and the second inclined surface can be configured as surfaces that typically incline in a direction closer to the drive shaft as they go upward and are aligned with each other. The first inclined surface and the second inclined surface may each be entirely flat or curved, or may include a flat surface and a curved surface. Also, both the first inclined surface and the second inclined surface may be annularly encircled around the drive shaft. Both the first inclined surface and the second inclined surface may be arranged in a plurality in the circumferential direction around the drive shaft. In addition, "in the process of moving downward" in this aspect is not limited to the entire moving process, and may be a part of the moving process.

In one aspect of the present invention, the work tool may further include a second holding member arranged movably in the vertical direction with respect to the first holding member and holding the engaging member movably in the radial direction. . According to this aspect, the engaging member can be stably held movably in the vertical direction and the radial direction with respect to the first holding member.

In one aspect of the invention, the operating member may be configured to move the second holding member downward relative to the first holding member in response to the releasing operation. The second holding member may be configured to abut the pressing member from above during the downward movement process. According to this aspect, the push-down member can be pushed down while stably holding the engaging member by the second holding member.

In one aspect of the invention, the first biasing member may be a spring. The second retaining member may then be configured to receive one end of the spring. In other words, the second holding member may be configured as a spring receiving portion. According to this aspect, the engaging member that engages with the clamp shaft can be biased upward by the spring through the second holding member, and the clamp shaft can be held at the clamp position.

In one aspect of the present invention, the operating member is configured to move the second holding member downward relative to the first holding member in response to a release operation to release the clamping force applied to the clamp shaft by the spring. may be According to this aspect, the operation member receives the biasing force of the spring, so that the second holding member can be moved downward and the clamping force can be released at the same time.

In one aspect of the invention, the hold-down member may be a sleeve radially disposed between the clamp shaft and the spindle. According to this aspect, sticking of the tip tool can be eliminated with a simple configuration.

In one aspect of the invention, the work tool may further comprise a second biasing member configured to bias the depression member upward. According to this aspect, it is possible to prevent the tip tool from being pushed down except when the operating member is operated to be released.

In one aspect of the present invention, the first biasing member and the second biasing member may be springs with different diameters. The work tool may further include a spring receiving portion common to the first biasing member and the second biasing member. According to this aspect, the first biasing member and the second biasing member can be compactly arranged while suppressing an increase in the number of parts.

In one aspect of the present invention, the first holding member may be supported by the housing so as not to move vertically. According to this aspect, assembly of the first holding member is facilitated.

In one aspect of the invention, the work tool may further comprise a third biasing member configured to bias the engagement member radially inward. According to this aspect, it is possible to reduce the possibility that the clamp shaft will fall off the spindle when the engaging member is arranged at the second position with respect to the first holding member.

FIG. 4 is a perspective view of the vibratory tool with the lever in the forward position; 1 is a cross-sectional view of a vibration tool; FIG. FIG. 3 is a cross-sectional view along line III-III of FIG. 2 (however, the tip tool is not shown). It is a perspective view from the upper part of an inner housing. It is a perspective view from the downward direction of an inner housing. FIG. 3 is a partially enlarged view of FIG. 2; FIG. 7 is a partially enlarged view of FIG. 6; FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 7; FIG. 8 is a cross-sectional view corresponding to FIG. 7 when the lever is placed in the upper position; FIG. 9 is a cross-sectional view corresponding to FIG. 8 when the lever is placed in the upper position; FIG. 4 is a bottom view of the vibrating tool with the lower shell removed; FIG. 7 is a cross-sectional view taken along line XII-XII of FIG. 6; 1 is a perspective view of the vibrating tool with the upper shell removed; FIG. FIG. 3 is a plan view of the vibrating tool with the upper shell removed;

Hereinafter, a vibration tool 1 according to an embodiment will be described with reference to the drawings. Note that the vibration tool 1 is an example of an electric working tool that oscillates a tip tool 91 to perform a machining operation on a workpiece (not shown).

First, a schematic configuration of the vibration tool 1 will be described. As shown in FIGS. 1 and 2, the vibration tool 1 has an elongated housing (also called tool body) 10 . An elongated spindle 5 and a motor 41 as a drive source are housed at one end of the housing 10 in the longitudinal direction. The spindle 5 is arranged such that its longitudinal axis intersects (more specifically, substantially orthogonal to) the longitudinal axis of the housing 10 . One axial end of the spindle 5 protrudes from the housing 10 and is exposed to the outside. This one end constitutes a tool mounting portion 51 to which the tip tool 91 can be attached and detached. A battery 93 for supplying power to the motor 41 can be detachably attached to the other end of the housing 10 in the longitudinal direction. The vibration tool 1 is configured to swing the tip tool 91 on the swing plane P by reciprocatingly rotating the spindle 5 around the drive shaft A1 within a predetermined angle range by the power of the motor 41. .

In the following description, regarding the direction of the vibration tool 1, the extending direction of the drive shaft A1 is defined as the vertical direction for convenience. In the vertical direction, the tool mounting portion 51 side of the spindle 5 is defined as the lower side, and the opposite side is defined as the upper side. A direction orthogonal to the drive axis A1 and corresponding to the longitudinal direction of the housing 10 is defined as a front-rear direction. In the longitudinal direction, one end side of the housing 10 in which the spindle 5 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. A direction orthogonal to the up-down direction and the front-rear direction is defined as the left-right direction.

A detailed configuration of the vibration tool 1 will be described below.

First, the housing 10 will be explained. As shown in FIGS. 1 to 3, the housing 10 of this embodiment is configured as a so-called anti-vibration housing. and an elongated inner housing 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 which are formed separately from each other. The upper shell 27, the lower shell 28, and the switch holder 20 are members integrally molded of synthetic resin. Although not shown in detail, the outer housing 2 consists of an upper shell 27 and a lower shell 28, which are stacked vertically with the switch holder 20 interposed therebetween, and are connected at a plurality of points with screws. Thus, it is formed.

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

The front end portion 21 is generally formed in a rectangular box shape, and the front end portion 30 of the inner housing 3 is arranged therein. A lever 77 is rotatably supported at the upper front end portion of the front end portion 21 . The lever 77 is an operation member for fixing (locking) and unlocking the tip tool 91 by a lock mechanism 7 (see FIG. 7), which will be described later. An opening is provided in the upper wall portion of the front end portion 21, and a slide-type operating portion 294 is exposed through the opening so as to be externally operable. The operation unit 294 is an operation member for switching the switch 29 for starting the motor 41 between an on state and an off state.

The rear end portion 23 is formed in a cylindrical shape that widens rearward (the cross-sectional area increases). An elastic connecting portion 37 and a rear end portion 38 of the inner housing 3 are arranged inside the rear end portion 23 .

The central portion 22 is formed in a tubular shape and extends linearly in the front-rear direction. The central portion 22 constitutes a grip that can be gripped by the user. Therefore, the central portion 22 is formed narrower than the front end portion 21 and the rear end portion 23 so that the user can easily hold it.

As shown in FIGS. 2 to 6, in this embodiment, the inner housing 3 is formed by connecting a metal housing 301 and a resin housing 302 which are formed separately from each other. While the metal housing 301 is a single metal member, the resin housing 302 is formed by connecting a left shell 303 and a right shell 304 made of synthetic resin. The inner housing 3 has a rear end portion (a connecting portion 321 described later) of the metal housing 301 sandwiched between the left shell 303 and the right shell 304 from the left and right directions, and the inner housing 3 is connected with screws at a plurality of locations. formed.

Further, in the front-rear direction, the inner housing 3 includes a front end portion 30 , an extension portion 36 , an elastic connecting portion 37 and a rear end portion 38 .

The front end portion 30 is a portion that accommodates the spindle 5 , the motor 41 and the transmission mechanism 45 . The front end portion 30 includes a first accommodation portion 31 , a second accommodation portion 32 , a connecting portion 321 , a third accommodation portion 33 and a cover portion 35 . Note that the metal housing 301 is configured by portions of the front end portion 30 other than the cover portion 35 (that is, the first accommodating portion 31, the second accommodating portion 32, the connecting portion 321, and the third accommodating portion 33). be. The resin housing 302 is composed of the cover portion 35, and an extension portion 36, an elastic connecting portion 37, and a rear end portion 38, which will be described later.

The first accommodation portion 31 is a portion that accommodates the spindle 5 and is formed in a cylindrical shape that extends in the vertical direction. The opening at the upper end of the first housing portion 31 is covered with a cover 311 fixed to the first housing portion 31 with pins. The second accommodation portion 32 is a portion that accommodates the motor 41 and is formed in a cylindrical shape having a diameter larger than that of the first accommodation portion 31 . The second accommodation portion 32 is arranged behind the first accommodation portion 31 . The second housing portion 32 is vertically shorter than the first housing portion 31 , and the lower end of the second housing portion 32 is located above the lower end of the first housing portion 31 . The connecting portion 321 is a plate-like portion connected to the rear end of the second housing portion 32 and protruding rearward. The connection part 321 is a part that is arranged between the left shell 303 and the right shell 304 and fixed with a screw. The third housing portion 33 is a portion that houses the transmission mechanism 45 , and is arranged behind the first housing portion 31 and below the second housing portion 32 . The third accommodation portion 33 communicates with the first accommodation portion 31 and the second accommodation portion 32 . The cover portion 35 is a portion that covers the opening at the upper end of the second housing portion 32 .

The extending portion 36 is a cylindrical portion that is connected to the rear end portion (specifically, the second housing portion 32) of the front end portion 30 and extends rearward. The length of the extending portion 36 in the front-rear direction is set to be approximately the same as the length in the front-rear direction of the central portion (holding portion) 22 , and substantially the entire extending portion 36 is accommodated in the central portion 22 . The rear end of the extension portion 36 is an open end. That is, the rear end of the extension portion 36 defines the opening.

The elastic connecting portion 37 is a portion that extends rearward from the rear end of the extension portion 36 and connects the extension portion 36 and the rear end portion 38 so as to be relatively movable. The elastic connecting portion 37 includes a plurality of elastic ribs 371 connecting the extension portion 36 and the rear end portion 38 in the front-rear direction. In this embodiment, four elastic ribs 371 are spaced apart from each other around the long axis of the inner housing 3 extending in the front-rear direction. The elastic rib 371 is formed in a shape that is more elastically deformable than other parts of the inner housing 3 and is made of a material with a low elastic modulus. This suppresses the transmission of vibrations generated at the front end portion 30 to the rear end portion 38 during machining.

The rear end portion 38 is generally shaped like a rectangular box. As described above, the rear end portion 38 is arranged inside the rear end portion 23 of the outer housing 2, but there is a gap between the rear end portion 23 and the outer peripheral surface of the rear end portion 38. formed.

The outer housing 2 and the inner housing 3 configured as described above are elastically connected so as to be relatively movable. The elastic connection structure of the outer housing 2 and the inner housing 3 will be detailed later.

The internal structure of the inner housing 3 will be described below in order of the front end portion 30, the rear end portion 38, the elastic connecting portion 37, and the extension portion 36. As shown in FIG.

First, the internal structure of the front end portion 30 will be described. As shown in FIG. 6 , the front end portion 30 accommodates the spindle 5 , the motor 41 , the transmission mechanism 45 , the clamping mechanism 60 and the push-down mechanism 67 .

First, the spindle 5 will be explained. As shown in FIG. 7, the spindle 5 is a substantially cylindrical elongated member. In this embodiment, the spindle 5 is rotatably supported around the drive shaft A1 by two bearings 501 and 502 held in the lower portion of the first housing portion 31. As shown in FIG. As described above, the lower end portion of the spindle 5 is configured as the tool mounting portion 51 to which the tip tool 91 can be attached and detached.

In this embodiment, the tool mounting portion 51 is configured in the shape of a flange protruding radially outward with respect to the drive axis A1, and has an inclined surface 513 inclined in a direction intersecting the drive axis A1. More specifically, a concave portion 511 that is recessed upward is formed at the lower end portion of the tool mounting portion 51 . The inclined surface 513 is a part of the surface that defines the recessed portion 511, and is configured as an inclined surface that slopes downward in a direction away from the drive shaft A1 (outward in the radial direction). On the other hand, all of the tip tools 91 (blades, scrapers, grinding pads, polishing pads, etc.) that can be attached to the vibration tool 1 of the present embodiment have protrusions 911 that can be fitted into the recesses 511 . A portion of the upper surface that defines the convex portion 911 is configured as an inclined surface 913 matching the inclined surface 513 . In this embodiment, the tip tool 91 is clamped by the tool mounting portion 51 and a clamp head 615 of the clamp shaft 61 to be described later with the inclined surface 913 in contact with the inclined surface 513, and is fixed to the spindle 5. be done. The fixation of the tip tool 91 to the spindle 5 will be detailed later. A recess 515 having a circular cross section and recessed further upward from the recess 511 is provided in the central portion of the recess 511 .

The motor 41 will be explained. As shown in FIG. 6, the motor 41 is a brushless DC motor, and includes a stator, a rotor disposed within the stator, and an output shaft 415 that rotates integrally with the rotor. The motor 41 is housed in the second housing portion 32 so that the rotation axis A2 of the output shaft 415 extends parallel to the drive shaft A1 (that is, vertically). An output shaft 415 projects downward from the rotor.

The transmission mechanism 45 will be explained. The transmission mechanism 45 is configured to transmit the rotational motion of the output shaft 415 to the spindle 5 and reciprocate the spindle 5 within a predetermined angular range around the drive shaft A1. As shown in FIG. 6 , the transmission mechanism 45 includes an eccentric shaft 451 having an eccentric portion 454 , a drive bearing 456 and a swing arm 458 .

The eccentric shaft 451 is a shaft that is coaxially connected to the output shaft 415 of the motor 41 . The eccentric shaft 451 is fixed to the outer circumference of the output shaft 415 and extends to the lower end of the third accommodation portion 33 . The eccentric shaft 451 is rotatably supported by two bearings 452 and 453 held at the lower ends of the second housing portion 32 and the third housing portion 33, respectively. The eccentric shaft 451 has an eccentric portion 454 that is eccentric with respect to the rotation axis A2. An inner ring of a drive bearing 456 is attached to the eccentric portion 454 . The swing arm 458 is a member that connects the drive bearing 456 and the spindle 5 . The swing arm 458 extends across the first housing portion 31 and the third housing portion 33 . Although detailed illustration is omitted because it is a well-known configuration, one end of the swing arm 458 is formed in an annular shape and fixed to the outer circumference of the spindle 5 between bearings 501 and 502 . The other end portion of the swing arm 458 is bifurcated and arranged to contact the outer peripheral surface of the outer ring of the drive bearing 456 from left and right.

When the motor 41 is driven, the eccentric shaft 451 rotates together with the output shaft 415 . As the eccentric shaft 451 rotates, the center of the eccentric portion 454 moves around the rotation axis A2, so the drive bearing 456 also moves around the rotation axis A2. As a result, the swing arm 458 swings about the drive axis A1 of the spindle 5 within a predetermined angular range. As the swing arm 458 swings, the spindle 5 reciprocates about the drive shaft A1 within a predetermined angular range. As a result, the tip tool 91 fixed to the spindle 5 is oscillatingly driven on the oscillating plane P about the driving axis A1, and the machining operation can be performed.

A fan 43 is fixed to the upper end of the eccentric shaft 451 . The fan 43 of this embodiment is a centrifugal fan, and is configured to rotate around the rotation axis A2 as the motor 41 is driven, suck air from above in the direction of the rotation axis A2, and send the air radially outward. ing. Thereby, an air flow for cooling the motor 41 is generated in the housing 10 . In addition, the air flow path in the housing 10 will be described in detail later.

The clamp mechanism 60 will be described below. The clamp mechanism 60 is a mechanism configured to fix the tip tool 91 to the tool mounting portion 51 so as to be rotatable integrally with the spindle 5 . As shown in FIGS. 7 and 8, the clamp mechanism 60 includes a clamp shaft 61, a clamp spring 65, and a lock mechanism 7 in this embodiment.

The clamp shaft 61 is a substantially cylindrical long member, and is detachably inserted through the spindle 5 coaxially therewith. The clamp shaft 61 has a round bar-shaped shaft portion 611 extending along the drive axis A1 and a flange-shaped clamp head 615 connected to the lower end portion of the shaft portion 611 . A groove portion 612 is provided at the upper end portion of the shaft portion 611 . The groove portion 612 is a portion in which a plurality of grooves dug over the entire circumference of the clamp shaft 61 are formed in the vertical direction.

The clamp spring 65 is a biasing member that biases the clamp shaft 61 upward with respect to the spindle 5 and imparts a clamping force to the clamp shaft 61 for clamping the tip tool 91 . In this embodiment, the clamp spring 65 is configured to urge the clamp shaft 61 upward via a lock mechanism 7 (more specifically, the holder 73 and the clamp member 71), which will be described later. More specifically, the clamp spring 65 is a compression coil spring and is arranged in a compressed state between a spring receiving member 57 arranged above the spindle 5 and a holder 73 which will be described later. Note that the spring receiving member 57 rotates together with the spindle 5 .

The lock mechanism 7 is a mechanism configured to hold (lock) the clamp shaft 61 at a clamp position (the position shown in FIGS. 7 and 8) where the tip tool 91 can be clamped. The lock mechanism 7 is arranged above the spindle 5 inside the first accommodation portion 31 . In this embodiment, locking mechanism 7 includes a pair of clamping members 71 , holder 73 , elastic ring 718 and collar 75 .

The pair of clamp members 71 are arranged to face each other with the drive shaft A1 interposed therebetween. A radially inner surface of the clamp member 71 is formed as a curved surface corresponding to the outer peripheral surface of the shaft portion 611 . Further, a ridge portion 717 is provided on this curved surface. The ridge portion 717 is a portion in which a plurality of ridges extending in the circumferential direction are formed in the vertical direction. The ridge portion 717 is configured to engage with the groove portion 612 of the clamp shaft 61 . Also, the upper end and the lower end of the clamp member 71 protrude radially outward from the central portion. In other words, a groove extending in the circumferential direction is provided in the outer peripheral portion of the central portion of the clamp member 71 in the vertical direction.

The holder 73 is configured to hold the pair of clamp members 71 movably in the radial direction with respect to the drive shaft A1. In this embodiment, the holder 73 as a whole is formed as a cylindrical member having a larger diameter than the shaft portion 611 of the clamp shaft 61 . The holder 73 has an insertion hole 731 and a pair of holding recesses 733 .

The insertion hole 731 is a concave portion with a circular cross section that extends upward along the drive shaft A1 from the lower surface of the holder 73 and whose upper end is closed. The insertion hole 731 has a slightly larger diameter than the shaft portion 611 of the clamp shaft 61 . The upper end portion of the shaft portion 611 can be inserted into the insertion hole 731 .

The pair of holding recesses 733 are provided in the vertical central portion of the holder 73 and extend radially inward (toward the drive axis A1) from the outer peripheral surface of the holder 73 symmetrically with respect to the drive axis A1. . Each holding recess 733 communicates with the insertion hole 731 at the radially inner end. The retaining recess 733 has a shape that matches the clamping member 71 . The pair of clamp members 71 are arranged in the pair of holding recesses 733 so as to be movable in the radial direction.

More specifically, the pair of clamping members 71 has an engagement position (the position shown in FIG. 7) closer to the drive shaft A1 and a release position (located radially outside the engagement position) farther from the drive shaft A1. position shown in FIG. 9). The ridges 717 of the pair of clamp members 71 can engage with the grooves 612 of the clamp shaft 61 when arranged at the engagement position. Further, when arranged at the engaging position, the outer peripheral surface of the clamp member 71 is arranged at substantially the same position as the outer peripheral surface of the holder 73 and does not protrude radially outward from the holding recess 733 . When arranged at the release position, the protrusion 717 and the groove 612 cannot be engaged. Further, when arranged at the release position, the outer peripheral surface of the clamp member 71 slightly protrudes radially outward from the holding recess 733 .

A lower end portion of the holder 73 has a flange-shaped spring receiving portion 735 protruding radially outward. The lower surface of the spring receiving portion 735 is in contact with the upper end portion of the clamp spring 65 . Although details will be described later, the lower surface of the central portion of the lower end of the holder 73 (the annular portion around the insertion hole 731) functions as a contact portion 737 that contacts the push-down sleeve 671 when the clamp is released.

The elastic ring 718 is mounted in a groove provided in the outer peripheral portion of the pair of clamp members 71 and biases the pair of clamp members 71 toward the engagement position radially inward. Note that the elastic ring 718 of this embodiment is an annular member made of rubber.

The collar 75 is a cylindrical member, and holds the holder 73 and the clamp member 71 so as to be relatively movable with respect to the collar 75 along the drive axis A1 (that is, vertically). The holder 73 is arranged inside the collar 75 and is vertically slidable along the inner peripheral surface of the collar 75 . The collar 75 is supported vertically immovably with respect to the inner housing 3 and rotatable about the drive shaft A1. More specifically, the collar 75 is rotatably supported by a bearing 751 fixed in the upper end of the first receiving portion 31 on the radially outer side of the collar 75 . By arranging the collar 75 in the first accommodating portion 31 above the spindle 5 instead of inside the spindle 5, the assembly of the collar 75 is facilitated.

In this embodiment, the collar 75 is configured to prohibit or allow movement of the clamp member 71 from the engagement position to the release position according to the relative positional relationship with the clamp member 71 in the vertical direction. . In other words, the clamp member 71 has two positions: a position where it cannot move from the engagement position (hereinafter referred to as a lock position) and a position where it can move radially from the engagement position to the release position (hereinafter referred to as an unlock position). It is vertically movable with respect to the collar 75 between.

More specifically, the collar 75 has an inner diameter that is approximately equal to the diameter of the holder 73, and an annular groove 753 that is recessed radially outward from the inner peripheral surface is provided in the center portion of the collar 75 in the vertical direction. . Therefore, as shown in FIG. 7, the outer peripheral surface of the clamp member 71 (more specifically, the outer peripheral surfaces of the upper and lower ends) contacts the inner peripheral surface of the collar 75 (portion other than the groove 753). , the clamping member 71 cannot move radially outward from the engaged position. That is, at this time, the clamp member 71 is in the locked position. On the other hand, as shown in FIG. 9, at the position where the upper end faces the groove 753 and the lower end of the collar 75 faces the groove on the outer peripheral portion of the clamp member 71, the clamp member 71 is radially outward from the engagement position. can be moved to That is, at this time, the clamp member 71 is in the unlocked position. As described above, in the present embodiment, the clamp member 71 is held by the holder 73 and is therefore stably movable vertically and radially with respect to the collar 75 .

The relative positional relationship between the clamp member 71 and the collar 75 in the vertical direction changes according to the operation of the lever 77, which will be described in detail later.

The push-down mechanism 67 will be described below. The push-down mechanism 67 is configured to push the tip tool 91 downward with respect to the spindle 5 in conjunction with the operation of the clamp mechanism 60 (more specifically, the downward movement of the holder 73). As shown in FIGS. 7 and 8, in this embodiment, the push-down mechanism 67 includes a push-down sleeve 671 arranged to be vertically movable with respect to the spindle 5, and a push-down sleeve 671 that is positioned relative to the spindle 5. and a biasing spring 675 that biases it upwards.

The push-down sleeve 671 is inserted through the spindle 5 coaxially therewith. Further, the push-down sleeve 671 is configured so that the clamp shaft 61 can be inserted therethrough. The hold-down sleeve 671 is thus arranged radially between the spindle 5 and the clamping shaft 61 .

More specifically, the hold-down sleeve 671 is an elongated cylindrical member having an outer diameter approximately equal to the inner diameter of the spindle 5 and an inner diameter approximately equal to the diameter of the shaft portion 611 . The push-down sleeve 671 is longer than the spindle 5 , and the upper portion of the push-down sleeve 671 protrudes upward from the spindle 5 . The clamp shaft 61 is longer than the push-down sleeve 671, and when inserted through the push-down sleeve 671, the clamp head 615 and the groove 612 protrude from the lower end and upper end of the push-down sleeve 671, respectively. The lower end of the push-down sleeve 671 is a large-diameter portion 673 having a diameter larger than that of other portions, and is configured to fit into the recess 515 at the lower end of the spindle 5 . A lower end surface 674 of the large diameter portion 673 is an annular flat surface.

A compression coil spring having a diameter smaller than that of the clamp spring 65 is used as the biasing spring 675 . The biasing spring 675 is arranged inside the clamp spring 65 , and the lower end of the biasing spring 675 contacts the spring receiving member 57 . That is, the spring receiving member 57 is used as a common spring receiving portion for the clamp spring 65 and the biasing spring 675 . This realizes a compact arrangement of the clamp spring 65 and the biasing spring 675 while suppressing an increase in the number of parts.

Also, the upper end of the biasing spring 675 abuts on a spring receiving member 676 arranged above the spring receiving member 57 . The spring receiving member 676 is mounted on the push-down sleeve 671 so as to be vertically movable with respect to the spring receiving member 57 . The upper end portion of the spring bearing member 676 abuts on a projection provided on the outer periphery of the push-down sleeve 671 from below. With this configuration, the biasing spring 675 biases the push-down sleeve 671 upward via the spring receiving member 676 .

The push-down sleeve 671 is normally held at the uppermost position where the shoulder portion (stepped portion) of the large diameter portion 673 contacts the shoulder portion (stepped portion) of the recessed portion 515 of the spindle 5 by the biasing force of the biasing spring 675 . It is When the push-down sleeve 671 is arranged at the uppermost position, the lower end (lower end surface 674) of the push-down sleeve 671 is clamped between the tool mounting portion 51 and the clamp head 615. upper surface of the projection 911). Also, the upper end of the push-down sleeve 671 is arranged below the lower surface of the holder 73 (contact portion 737).

The clamp mechanism 60 and the push-down mechanism 67 configured as described above are configured to operate in conjunction with the rotation operation of the lever 77 by the user. More specifically, the relative positional relationship between the clamp member 71 and the holder 73 and the collar 75 in the vertical direction changes in conjunction with the pivoting operation of the lever 77 . Furthermore, the push-down sleeve 671 also moves in conjunction with the movement of the holder 73 . The rotation operation of the lever 77 and the operations of the clamp mechanism 60 and the push-down mechanism 67 will be described below.

First, the lever 77 will be explained. As shown in FIGS. 1 and 8, the lever 77 is substantially U-shaped, and both ends of the lever 77 are rotatably supported above the front end portion 21 of the outer housing 2 . 1 and 7, the central portion of the lever 77 contacts the front surface of the front end portion 21 (hereinafter referred to as the front position), and as shown in FIGS. 9 and 10, the central portion is arranged above the front end portion 21 (hereinafter referred to as the upper position). The lever 77 is connected to a rotating shaft 78 that can rotate around a rotating shaft A3 extending in the left-right direction. The rotating shaft 78 extends in the left-right direction above the lock mechanism 7 (holder 73 ) and is inserted through a through hole that passes through the cover 311 of the front end portion 30 of the inner housing 3 in the left-right direction. Both ends of the rotating shaft 78 are connected to both ends of the lever 77 and are rotatably supported by the outer housing 2 . The rotating shaft 78 rotates together with the lever 77 as the lever 77 rotates. An eccentric portion (cam portion) 781 that is eccentric with respect to the rotation axis A3 is provided in the central portion of the rotation shaft 78 (on the drive shaft A1).

When the lever 77 is arranged in the forward position, the smaller diameter portion (minor diameter portion) of the eccentric portion 781 is arranged above and away from the holder 73, as shown in FIGS. . Therefore, the rotating shaft 78 does not receive the biasing force of the clamp spring 65 . The pair of clamp members 71 are arranged at the locked position with respect to the collar 75, and while clamping the clamp shaft 61 at the engaged position, are biased upward together with the holder 73 by the clamp spring 65 to move the clamp shaft 61 to the uppermost position. to hold. The clamp head 615 presses the tip tool 91 against the tool mounting portion 51 from below by the biasing force of the clamp spring 65 and fixes it to the spindle 5 . That is, the clamp head 615 clamps the tip tool 91 together with the tool mounting portion 51 . For this reason, the uppermost position of the clamp shaft 61 is also called the clamp position.

On the other hand, when the lever 77 is rotated upward from the front position and placed in the upper position, in the process, as shown in FIGS. contacts the upper end of holder 73 from above and moves holder 73 downward relative to spindle 5 and collar 75 while further compressing clamp spring 65 . As a result, the clamping force applied to the clamp head 615 by the clamp spring 65 (the force pressing the tip tool 91 upward against the spindle 5) is released. For this reason, the operation of rotating the lever 77 from the front position to the upper position is also referred to as a clamp release operation.

In conjunction with the clamp release operation, the clamp member 71 held by the holder 73 moves downward with respect to the collar 75 and is arranged at the unlock position. That is, the lock of the clamp shaft 61 by the lock mechanism 7 is released. As mentioned above, the clamp member 71 is biased toward the engaged position by a resilient ring 718 mounted in a groove on its outer periphery. Therefore, the clamp shaft 61 is temporarily held at that position by the clamp member 71 unless an external force acting against the biasing force of the elastic ring 718 moves the clamp member 71 radially outward from the engaged position. , does not come off the spindle 5. When the user pulls the clamp shaft 61 downward, the clamp member 71 temporarily moves to the release position, so the user can pull out the clamp shaft 61 from the spindle 5 and replace the tip tool 91 .

Further, when the holder 73 moves downward with respect to the spindle 5 in conjunction with the clamp releasing operation, in this process, the abutting portion 737 of the holder 73 is pushed against the upper end of the push-down sleeve 671 arranged at the uppermost position. It abuts from above and pushes down the push-down sleeve 671 against the biasing force of the biasing spring 675 . That is, the holder 73 has a function of holding the clamp member 71 and a function of pushing down the push-down sleeve 671 . The inclined surface 913 and the inclined surface 513 of the tip tool 91 are in contact with each other, and when the tip tool 91 is oscillatingly driven while being pressed against the tool mounting portion 51 from below by the clamp head 615 (see FIG. It may stick. In such a case, the large-diameter portion 673 of the push-down sleeve 671 comes into contact with the tip tool 91 from above in the downward process, and pushes the tip tool 91 downward, thereby canceling the stuck state of the tip tool 91 . can be done. In this embodiment, the lower end surface 674 of the push-down sleeve 671 is in surface contact with the tip tool 91 around the shaft portion 611 and pushes down the tip tool 91 in a well-balanced manner. can do.

The operation for attaching the clamp shaft 61 to the spindle 5 and clamping the tip tool 91 is basically the reverse of the operation for removing. With the lever 77 positioned at the upper position and the clamp member 71 positioned at the unlocked position with respect to the collar 75, the user presses the clamp shaft 61 inserted through the tip tool 91 into the spindle 5 (push). It is inserted into the lowering sleeve 671 ) and moved upward until the upper end abuts against the holder 73 . In this process, the clamp member 71 is temporarily moved to the release position, and then returned to the engagement position by the biasing force of the elastic ring 718 . The protrusion 717 is engaged with the groove 612 and the clamp shaft 61 is temporarily held by the clamp member 71 .

When the user rotates the lever 77 from the upper position to the forward position, the urging force of the clamp spring 65 applied to the rotating shaft 78 via the eccentric portion 781 is released. As a result, the holder 73 and the clamp member 71 are urged upward by the clamp spring 65 to move upward relative to the collar 75 . When the clamp member 71 moves to the locked position relative to the collar 75, the clamp shaft 61 also returns to the clamp position.

The internal structure of the rear end portion 38 will be described below. As shown in FIGS. 2 to 4, in this embodiment, the rear portion of the rear end portion 38 is configured as a battery mounting portion 381, and the front portion of the rear end portion 38 is configured as a controller housing portion 382. there is The battery mounting portion 381 has an engagement structure capable of sliding engagement with the battery 93, a terminal electrically connected to the battery 93, and the like. Since the battery mounting portion 381 and its structure are well known, detailed description thereof will be omitted. The controller accommodating portion 382 accommodates a controller 383 including a control circuit. The controller 383 is configured to drive the motor 41 when the switch 29 is turned on.

The internal structure of the elastic connecting portion 37 will be described. As shown in FIGS. 2 to 4, the switch holder 20 is arranged in the internal space of the elastic connecting portion 37 (the space area surrounded by the elastic ribs 371 in the circumferential direction). The switch holder 20 is a member configured to hold the switch 29 . Although the switch holder 20 is arranged in the inner space of the elastic connecting portion 37 , it is fixed to the upper shell 27 and the lower shell 28 with screws and is a part of the outer housing 2 .

The internal structure of the extension portion 36 will be described. As shown in FIGS. 2 to 4, in this embodiment, the spindle 5, the motor 41 and the transmission mechanism 45 are arranged at the front end portion 30, and the battery mounting portion 381 is provided at the rear end portion 38. It is possible to minimize the number of parts arranged in the housing portion 36 . Therefore, although electric wires and connection terminals for connecting the substrates of the controller 383 and the motor 41 are arranged in the extending portion 36 (not shown), other parts are not arranged. For this reason, the extending portion 36 is formed thinner than the front end portion 30, the elastic connecting portion 37, and the rear end portion 38 so that the central portion (holding portion) 25 of the outer housing 2 can be easily grasped. .

The elastic connection structure between the outer housing 2 and the inner housing 3 will be described below. In this embodiment, the outer housing 2 and the inner housing 3 are elastically connected at a plurality of points. Specifically, between the front end portion 21 and the front end portion 30, between the rotary shaft 78 supported by the outer housing 2 and the front end portion 30, and between the switch holder 20 and the rear end portion 38, Each has an elastic member interposed therebetween.

First, the elastic connecting structure between the front end portion 21 and the front end portion 30 will be described.

As shown in FIGS. 5, 6, 11 and 12, the lower wall of the front end portion 30 is provided with two recesses 335 having a circular cross section. More specifically, the recess 335 is formed as a recess recessed upward from the lower surface of the lower wall portion of the third accommodation portion 33 that accommodates the swing arm 458 of the transmission mechanism 45 . The two recesses 335 are arranged side by side in the left-right direction. In the longitudinal direction, the two recesses 335 are arranged between the drive shaft A1 of the spindle 5 and the rotation axis A2 of the output shaft 415 of the motor 41 (more specifically, between the bearings 502 and 453). there is On the other hand, as shown in FIG. 12, two columnar protrusions 215 are provided on the lower wall of the front end portion 21 . The protrusions 215 protrude upward from the lower wall portion of the front end portion 21 so as to face the central portion of the recessed portion 335 of the inner housing 3 .

An elastic member 11 is fitted in each recess 335 . The elastic member 11 is formed in a cylindrical shape. The protrusion 215 is fitted inside the elastic member 11 and is covered with the elastic member 11 over the entire circumference. The height of the elastic member 11 is set larger than the depth of the recess 335 and the height of the protrusion 215, and a gap is provided between the inner housing 3 and the outer housing 2 in the vertical direction. In this manner, the cylindrical elastic member 11 is in contact with the inner housing 3 at its outer peripheral surface and upper end surface, and in contact with the outer housing 2 at its inner peripheral surface and lower end surface. intervene between In addition, in this embodiment, the elastic member 11 is made of a urethane-based resin having an ultrafine foam structure.

An elastic connection structure between the rotating shaft 78 and the front end portion 30 will be described.

As shown in FIG. 8, the left end and right end of the rotating shaft 78 are rotatably supported by the upper left end and upper right end of the front end 21, respectively. The rotating shaft 78 passes through the cover 311 of the front end portion 30 in the left-right direction within the upper end portion of the front end portion 21 . The left wall portion and the right wall portion of the cover 311 are each provided with a concave portion 313 having a circular cross section that is concave inward (center side in the left-right direction). On the other hand, two cylindrical elastic members 13 are fitted to the rotating shaft 78 . The two elastic members 13 are arranged inside the left and right walls of the front end 21 . The inner portion of each elastic member 13 is fitted in the recess 313 of the cover 311 and pressed against the outer housing 2 via a washer on the outside. In this manner, the cylindrical elastic member 13 contacts the inner housing 3 at its outer peripheral surface and inner end surface, contacts the rotating shaft 78 connected to the outer housing 2 at its inner peripheral surface, and further contacts the outer peripheral surface. It is interposed between the inner housing 3 and the outer housing 2 with the end face contacting the outer housing 2 via the washer. Like the elastic member 11, the elastic member 13 is made of urethane-based resin having an ultrafine foam structure.

An elastic connection structure between the switch holder 20 and the rear end portion 38 will be described.

As shown in FIG. 3, the switch holder 20 has a generally rectangular box shape. A left wall portion and a right wall portion of the switch holder 20 are respectively provided with recesses 203 that are recessed toward the inside (toward the center in the left-right direction). The elastic member 15 is fitted in the recess 203 . Like the elastic member 11, the elastic member 15 is made of urethane-based resin having an ultrafine foam structure. The elastic member 15 has a through hole penetrating the elastic member 15 in the left-right direction. On the other hand, a pair of arm portions 385 protrude forward from the left wall portion and the right wall portion of the rear end portion 38 (controller accommodating portion 382) of the inner housing 3. As shown in FIG. A projection 386 that protrudes inward (center side in the left-right direction) is provided at the tip of each arm portion 385 . The tip of the arm portion 385 contacts the outer surface of the elastic member 15 , and the protrusion 386 is fitted into the through hole of the elastic member 15 and covered with the elastic member 15 over the entire circumference. Note that the tip of the protrusion 386 is separated from the bottom of the recess 203 .

With the configuration described above, the inner housing 3 and the outer housing 2 are relatively movable in all directions including the vertical direction, the front-rear direction, and the left-right direction through the elastic members 11 , 13 , and 15 . That is, the inner housing 3 and the outer housing 2 are elastically connected so as to be able to cope with vibrations in any direction.

Since the front end portion 30 accommodates the motor 41 , the spindle 5 and the transmission mechanism 45 , the largest vibration can occur in the front end portion 30 of the inner housing 3 when the tip tool 91 is driven to swing. More specifically, the output shaft 415 and the spindle 5 vibrate as they are driven to rotate. In contrast, in the present embodiment, the elastic member 11 interposed between the inner housing 3 and the outer housing 2 is arranged between the drive shaft A1 of the spindle 5 and the rotation axis A2 of the output shaft 415 in the front-rear direction. ing. With such arrangement, the elastic member 11 can cope with both the vibration caused by the spindle 5 and the vibration caused by the output shaft 415, and can effectively suppress the transmission of the vibration to the outer housing 2. In addition, the elastic member 11 is arranged below the third housing portion 33 that houses the swing arm 458 of the transmission mechanism 45 in the vertical direction, and is relatively close to the swing plane P. As shown in FIG. Therefore, it is possible to prevent the inner housing 3 from wobbling within the outer housing 2 when the tip tool 91 is driven to swing.

In addition, in the present embodiment, the two elastic members 11 are arranged side by side in the left-right direction, thereby realizing an elastic connection structure with higher durability than the case where one elastic member 11 is provided.

Furthermore, in this embodiment, the front end portion 30 is elastically connected to the outer housing 2 via the elastic member 13 that is attached to the rotating shaft 78 in addition to the elastic member 11 . In addition to the front end portion 30 , the rear end portion 38 is also elastically connected to the switch holder 20 as part of the outer housing 2 via the elastic member 15 . Therefore, the transmission of vibration to the outer housing 2 is suppressed more effectively.

By arranging the elastic member 13 as described above, the rotating shaft 78 can be stably held by the inner housing 3 (cover 311) through the elastic member 13 before the outer housing 2 is assembled. becomes. After that, both ends of the rotating shaft 78 are sandwiched between the upper shell 27 and the lower shell 28 of the outer housing 2, and the upper shell 27 and the lower shell 28 are connected with screws so that the rotating shaft 78 can be rotated. It is held by the outer housing 2 . In this way, the elastic member 13 also contributes to simplification of assembly. Also, since the two elastic members 13 are arranged at the left end and the right end of the rotating shaft 78, the rotating shaft 78 can be held in good balance. Furthermore, it is only necessary to fit the cylindrical elastic member 13 onto the rotating shaft 78, and assembly is easy.

By the way, as described above, the switch 29 for starting the motor 41 is held by the rear end portion 23 of the outer housing 2 via the switch holder 20 . Therefore, the outer housing 2 also holds a switching member 293 that is connected to the operating portion 291 of the switch 29 and switches the switch 29 between the ON state and the OFF state. The switching member 293 and its holding structure will be described below.

As shown in FIGS. 2 and 4, the switching member 293 is an elongated member linearly extending in the front-rear direction. An operating portion 294 is integrally formed at the front end portion of the switching member 293 . A rear end portion of the switching member 293 is connected to the operating portion 291 of the switch 29 . The switching member 293 moves in the front-rear direction in response to the user's sliding operation in the front-rear direction of the operation unit 294, thereby moving the operation unit 291 between the ON position and the OFF position (that is, turning the switch 29 on). state and off state). In this embodiment, the switching member 293 is held by the holding member 26 supported by the outer housing 2 so as to be movable in the front-rear direction with respect to the outer housing 2 .

As shown in FIGS. 2, 4, 13 and 14, the holding member 26 is supported by the lower shell 28 and the switch holder 20 of the outer housing 2 to allow the switching member 293 to slide in the front-rear direction. configured to hold. In this embodiment, the holding member 26 includes slide guide portions 261 and support legs 263 .

The slide guide portion 261 is formed in an elongated shape extending in the front-rear direction and has a shape generally corresponding to the switching member 293 . A concave portion is formed on the upper surface of the slide guide portion 261 . The switching member 293 is arranged in the recess so as to be slidable in the front-rear direction. A plurality of supporting legs 263 protrude from the left side and right side of the front end of the slide guide portion 261 . As shown in FIG. 13, each support leg 263 extends downward in a curved shape. On the other hand, a plurality of protrusions 283 are provided on the left and right side portions of the portion of the lower shell 28 that constitutes the front end portion 21 . The protrusion 283 protrudes above the upper end of the lower shell 28 . The protrusion 283 is provided at a position corresponding to the support leg 263 and receives the lower end of the support leg 263 . Also, the rear end portion 262 of the holding member 26 is placed on and locked to the switch holder 20 elastically connected to the rear end portion 38 of the inner housing 3 .

As shown in FIG. 14, each support leg 263 is provided with a semicircular concave portion in plan view. Cylindrical portions 285 are provided at four locations on the inner side of the lower shell 28 so as to face the recesses of the support legs 263 . The upper end of the cylindrical portion 285 is positioned below the upper end of the lower shell 28 . On the other hand, as shown in FIGS. 3 and 11, cylindrical portions 271 having female threads formed on the inner circumference are provided at four corresponding locations on the upper shell 27 . The cylindrical portion 271 projects downward beyond the lower end of the upper shell 27 . In the process of assembling the vibration tool 1 , the upper shell 27 is connected to the lower shell 28 after the inner housing 3 and the holding member 26 are accommodated in the lower shell 28 . At this time, the cylindrical portion 271 of the upper shell 27 is fitted into the recessed portion of the support leg 263 and is further fitted into the cylindrical portion 285 of the lower shell 28 , so that the holding member 26 is properly attached to the outer housing 2 . Positioned. After that, a screw is inserted from the lower side of the cylindrical portion 285 and screwed into the cylindrical portion 271 to fix the lower shell 28 and the upper shell 27 together.

Although not shown in detail, when the upper shell 27 is connected to the lower shell 28 , each support leg 263 extends inside the outer housing 2 along the inner surface of the upper shell 27 while being separated from the inner housing 3 . placed in Further, as shown in FIG. 12 , the slide guide portion 261 is arranged inside the outer housing 2 along the lower surface of the upper wall portion of the upper shell 27 while being separated from the inner housing 3 .

Furthermore, as shown in FIGS. 13 and 14 , in this embodiment, the holding member 26 holds an illumination device 260 for illuminating the working area of the tip tool 91 in addition to the switching member 293 . Therefore, the holding member 26 has a lighting device holding portion 265 projecting forward from the slide guide portion 261 . The lighting device holding portion 265 includes an extension portion 266 and a pair of arm portions 268 . The extending portion 266 is a portion that extends linearly forward from the center of the front end portion of the slide guide portion 261 in the left-right direction to the front of the rotating shaft 78 . A pair of arm portions 268 are portions that extend downward in a bifurcated manner from the front end of the extension portion 266 and hold the lighting device 260 . Note that the holding member 26 is configured to guide an electric wire 269 for supplying power from the controller 383 to the lighting device 260 . The wire 269 is held in a groove configured to extend from the rear end 262 to the lighting device holding portion 265 on the upper surface of the holding member 26 .

Further, as shown in FIG. 8, a groove 267 having a rectangular cross-section extending in the front-rear direction is formed in the lower surface of the extension portion 266 . The groove 267 is configured so as to be able to fit into the long diameter portion of the eccentric portion 781 of the rotating shaft 78 . When the lever 77 is arranged at the forward position, the long diameter portion of the eccentric portion 781 of the rotating shaft 78 protrudes upward and fits into the groove 267 . In this way, the illumination device holding portion 265 is supported by the rotating shaft 78 and arranged in the outer housing 2 while being separated from the inner housing 3 when the tip tool 91 is clamped. Also, in the process of assembling the vibration tool 1, before the inner housing 3 is accommodated in the outer housing 2, the operator attaches the rear end portion 38 and the illumination device holding portion 265 to the switch holder 20 and the rotary shaft 78, respectively. It can be placed and stably held. This facilitates the work of accommodating the inner housing 3 and the holding member 26 in the outer housing 2 .

The air flow path within the housing 10 will be described below.

As described above, in this embodiment, the housing 10 is a two-layer housing including the inner housing 3 and the outer housing 2 . Therefore, the air for cooling the motor 41 flows into the outer housing 2 from the outside, further flows into the inner housing 3, cools the motor 41, flows out of the inner housing 3, and then flows out of the outer housing 2 to the outside. flow out to

In this embodiment, as shown in FIGS. 2 and 3, an annular opening defined by the rear end (open end) of the rear end portion 23 of the outer housing 2 and the outer peripheral surface of the rear end portion 38 of the inner housing. The (gap) functions as an air intake port 801 for letting outside air flow into the outer housing 2). On the other hand, as shown in FIGS. 2, 4 and 5, the inner housing 3 is provided with intake ports 803, 804, 805 at a plurality of different positions. The intake port 803 is a plurality of through holes formed in the left wall portion and the right wall portion of the rear end portion 38 (more specifically, the controller housing portion 382). The intake port 804 is an opening defined at the rear end of the tubular extension 36 . The intake port 805 is a through hole formed in the upper and lower wall portions of the extension portion 36 and extends linearly in the front-rear direction.

As shown in FIGS. 4 and 5, an exhaust port 807 for exhausting the air after cooling the motor 41 from the inner housing 3 is provided at the front end portion 30 . More specifically, the exhaust ports 807 are a plurality of through holes formed in the peripheral wall portion of the second accommodation portion 32 and provided radially outward of the fan 43 . Further, as shown in FIG. 6, a plurality of exhaust ports 809 for discharging air from the outer housing 2 are formed in the lower wall portion of the front end portion 21 (more specifically, the area below the motor 41). is a through-hole. Although detailed illustration is omitted, the exhaust ports 809 are arranged side by side in the left-right direction. The lower wall of the front end portion 21 is provided with an opening for exposing the lower end of the spindle 5 to the outside, and a gap exists around the spindle 5 . Therefore, the air discharged from the inner housing 3 can flow out of the outer housing 2 through this gap as well.

2, 3 and 5, in this embodiment, between the exhaust port 807 of the inner housing 3 and the intake ports 803, 804, 805, the inner housing 3 and the outer housing 2 are provided. A partition wall 81 is provided to partition the space (gap) between the . That is, the partition wall 81 divides the space between the inner housing 3 and the outer housing 2 into a space on the side of the exhaust port 807 and a space on the side of the intake ports 803 , 804 , 805 . The partition wall 81 is formed in a tapered tubular shape, and the smaller diameter end portion thereof is joined to the front end portion of the extension portion 36 so as to expand in diameter toward the front. A front edge of the partition wall 81 is in contact with the inner peripheral surface of the outer housing 2 and the slide guide portion 261 of the holding member 26 . In this embodiment, the partition wall 81 is made of an elastically deformable elastomer and integrally formed with the resin housing 302 (the left shell 303 and the right shell 304).

Flow paths of air generated by the rotation of the fan 43 and flowing through the housing 10 are as follows. First, part of the air that has flowed into the outer housing 2 from the air intake port 801 flows into the rear end portion 38 from the air intake port 803 to cool the controller 383, and then flows forward through a gap in front of the rear end portion 38. Another portion of the air that has flowed in from the intake port 801 flows forward through the gap between the rear end portion 23 and the rear end portion 38 . Further, the air passes around the elastic ribs 371 and the switch holder 20, part of which flows into the tubular extension 36 from the air inlet 804, and another part of which flows into the central portion 22 and the extension. 36 and flows into the extending portion 36 from the intake port 805 . In this embodiment, the intake ports 804 and 805 are provided in the cylindrical extension portion 36 , so that the inflowing air efficiently flows through the extension portion 36 toward the front end portion 30 .

The air that has flowed into the front end portion 30 mainly flows into the motor 41 through the through hole in the central portion of the substrate arranged on the upper side of the motor 41, and flows downward between the stator and the rotor, 41 is cooled. After that, the air sent radially outward by the fan 43 flows out of the inner housing 3 through the exhaust port 807 of the second accommodation portion 32 and out of the housing 10 through the exhaust port 809 of the outer housing 2 . do.

As described above, the partition 81 is arranged between the exhaust port 807 and the intake ports 803 , 804 , 805 . Therefore, the air warmed by the cooling of the motor 41 and discharged from the exhaust port 807 is prevented from passing through the outer housing 2 and entering the inner housing 3 again from the intake ports 803 , 804 , 805 . As a result, a decrease in cooling efficiency of the motor 41 can be suppressed.

In particular, the partition 81 is formed in a tapered tubular shape from elastomer. Therefore, the partition wall 81 is deformed by the pressure difference between the front space and the rear space of the partition wall 81, and the peripheral edge of the partition wall 81 is pressed against the inner peripheral surface of the outer housing 2 and the slide guide portion 261, and is in close contact. do. Accordingly, it is possible to more reliably prevent the air discharged from the exhaust port 807 from flowing into the space on the side of the intake ports 803 , 804 , 805 . In addition, since the partition wall 81 is elastically deformable, it is possible to reduce the possibility of creating a gap when the inner housing 3 and the outer housing 2 move relative to each other.

Conventional work tools include a motor arranged so that the rotation axis of the output shaft (the rotation axis of the fan) intersects the drive shaft of the spindle and extends parallel to the long axis of the inner housing. There is a type to prepare. In this type, the air that flows in from the intake port and flows in the inner housing in the longitudinal direction passes through the fan without changing its direction and flows out from the exhaust port. In such a flow path, it is difficult for the air that has flowed out from the exhaust port to flow toward the intake port.

On the other hand, in the vibration tool 1 of the present embodiment, the motor 41 is configured so that the rotation axis A2 of the output shaft 415 (that is, the rotation axis A2 of the fan 43) is parallel to the drive axis A1 of the spindle 5 and It is arranged so as to intersect the extending direction of the shaft. With such an arrangement, the spindle 5 and the motor 41 are arranged close to each other, and the vibration tool 1 can be made compact. On the other hand, the direction of air flow within the inner housing 3 changes in the vicinity of the motor 41 . Specifically, the air that has flowed in from the intake ports 803, 804, and 805 flows forward along the longitudinal axis of the inner housing 3 inside the extension portion 36, and flows into the front end portion 30 (more specifically, the second accommodation portion 32). ) and flows downward inside the motor 41 and out of the exhaust port 807 . In such a configuration, the air flowing out from the exhaust port 807 flows more easily toward the intake ports 803, 804, and 805 than in the above-described type, so it can be said that the effect of providing the partition wall 81 is remarkable.

By the way, in this embodiment, the inner housing 3 is formed by connecting the metal housing 301 and the resin housing 302 . Therefore, a gap may occur at the connection portion (boundary) between the metal housing 301 and the resin housing 302 . Therefore, the vibration tool 1 is provided with a closing member 83 for closing the gap generated between the metal housing 301 and the resin housing 302 .

In this embodiment, although the front end of the extending portion 36 is in contact with the second accommodating portion 32, a slight gap is likely to occur between them. Therefore, the closing member 83 is configured to close the gap between the second accommodation portion 32 and the extension portion 36 . On the other hand, the cover portion 35 is fixed to the upper end portion of the second housing portion 32 by screws so as to be in close contact therewith. The left shell 303 and the right shell 304 of the resin housing 302 are also fixed by screws so as to be in close contact with each other. Therefore, in this embodiment, no blocking member is provided to block these boundaries, but a blocking member may be provided similarly.

In this embodiment, the closing member 83 is made of the same elastomer as the partition wall 81, and is integrally formed with the resin housing 302 (the left shell 303 and the right shell 304) along the front end of the extension 36. there is Therefore, when the metal housing 301 and the resin housing 302 are connected, the closing member 83 comes into close contact with the outer peripheral surface of the second housing portion 32 to close the gap. As a result, the air warmed by the cooling of the motor 41 and flowing out from the exhaust port 807 can be prevented from flowing back into the inner housing 3 through the gap between the second accommodation portion 32 and the extension portion 36 . can. As a result, a decrease in cooling efficiency of the motor 41 can be suppressed. In particular, when air flows in from the gap between the second accommodation portion 32 and the extension portion 36, it is sucked into the motor 41 from above the motor 41 by the fan 43, so closing this gap is effective. target.

Further, as described above, in the present embodiment, the partition wall 81 and the closing member 83 are formed integrally with the inner housing 3 (resin housing 302), so they are separate members from the inner housing 3 or the outer housing 2. Assembling is easier than in some cases. In addition, since the switching member 293 and the holding member 26 of the switch 29 are held inside the outer housing 2 , by providing the partition wall 81 in the inner housing 3 , it is easy to assemble the inner housing 3 and the outer housing 2 . becomes.

Correspondence between each component of the above embodiment and each component of the present invention is shown below. However, each component of the embodiment is merely an example, and does not limit each component of the present invention. The vibration tool 1 is an example of a "work tool." The inner housing 3 is an example of a "housing". 'Spindle 5 and tool mounting portion 51 are examples of 'spindle' and 'tool mounting portion' respectively. The drive shaft A1 is an example of a "drive shaft". The clamp shaft 61 is an example of a "clamp shaft". The clamp spring 65 is an example of a "first biasing member". The clamp member 71 is an example of an "engagement member." The collar 75 is an example of a "first holding member". The lever 77 is an example of an "operating member". The push-down sleeve 671 is an example of a "pull-down member." The inclined surface 513 and the inclined surface 913 are examples of the "first inclined surface" and the "second inclined surface", respectively. The holder 73 is an example of a "second holding member". The biasing spring 675 is an example of a "second biasing member". The spring receiving member 57 is an example of a "spring receiving portion". The elastic ring 718 is an example of a "third biasing member".

The above embodiment is merely an example, and the work tool according to the present invention is not limited to the configuration of the vibration tool 1 illustrated. For example, the modifications exemplified below can be made. It should be noted that any one of these modifications, or a plurality thereof, may be employed in combination with the vibration tool 1 shown in the embodiment or the inventions described in each claim.

For example, the configuration of the clamp mechanism 60 (for example, the shape, arrangement, and support structure of the clamp shaft 61 and clamp spring 65, the constituent members, shape, arrangement, and support structure of the lock mechanism 7) can be changed as appropriate. Below are examples of modifications that can be adopted.

For example, clamp shaft 61 may be biased upwardly against spindle 5 directly by clamp spring 65 rather than via holder 73 and clamp member 71 . Instead of the compression coil spring, the clamp spring 65 may employ, for example, a tension coil spring, a torsion spring, a disk spring, or a rubber spring.

In the above embodiment, the holder 73 has multiple functions (a function of holding the clamp member 71, a function of receiving the biasing force of the clamp spring 65, and a function of pushing down the push-down sleeve 671 in conjunction with the clamp release operation of the lever 77). configured to perform. However, the holder 73 does not have to perform all of these functions. Also, these functions may be realized by a plurality of members.

Clamping member 71 may be held directly by collar 75 . That is, the holder 73 may be omitted. In this case, for example, the clamping member 71 may be directly or indirectly held by the inner housing 3 so as to be radially movable, and the collar 75 may be vertically movable with respect to the clamping member 71 and the spindle 5 . . In this case, the collar 75 will push down on the hold-down sleeve 671 during the downward movement. Further, the collar 75 and the clamp member 71 are configured such that when the collar 75 moves downward in conjunction with the clamp release operation of the lever 77, the clamp member 71 relatively moves from the lock position to the unlock position.

Although the number of clamp members 71 is two in the above embodiment, it may be three or more. Moreover, the engaging member that engages with the clamp shaft 61 and holds it at the clamp position is not limited to the clamp member 71 . For example, a ball may be employed. In this case, the upper end of the clamp shaft 61 may be provided with an annular groove having a semicircular cross-section corresponding to the ball instead of the groove 612 . Note that the number of balls may be one or plural. Along with the change of the clamp member 71, the configuration of the collar 75 can also be changed as appropriate. Also, the lock mechanism 7 may be arranged, for example, inside the spindle 5 instead of above the spindle 5 .

Further, the push-down sleeve 671 is pushed down by one of the holder 73 (or the clamp member 71) and the collar 75 in conjunction with the clamp release operation of the lever 77, and as long as the tip tool 91 can be pushed down, the push-down sleeve 671 is pushed down. Shapes, arrangements, support structures, etc. may vary. For example, the shape of the large diameter portion 673 can be changed as appropriate. However, in order to more reliably eliminate the attachment of the tip tool 91, it is preferable that the large diameter portion 673 and the tip tool 91 contact each other at a plurality of points around the clamp shaft 61, and surround the clamp shaft 61 in the circumferential direction. It is more preferable to make contact as in the above embodiment, and it is even more preferable to make surface contact as in the above embodiment. Also, instead of the cylindrical push-down sleeve 671, one or a plurality of rod-shaped push-down members may be provided. In the above embodiment, the holder 73 contacts the push-down sleeve 671 and pushes down the push-down sleeve 671, but the push-down sleeve 671 may be pushed down via another member. Alternatively, the push-down sleeve 671 may be connected to the lower end of the holder 73 and vertically movable together with the holder 73 .

The biasing spring 675 of the push-down sleeve 671 may be, for example, a tension coil spring, a torsion spring, a disk spring, or a rubber spring instead of a compression coil spring. Also, the arrangement of the urging spring 675 is not limited to the example of the above embodiment.

The elastic ring 718 for temporarily holding the clamp shaft 61 when the clamp member 71 is placed at the unlocked position is not rubber but another elastic body (for example, a metal elastic ring). may be omitted.

Lever 77 and pivoting shaft 78 may have any shape, arrangement, or support structure as long as it is possible to move one of clamp member 71 and collar 75 (or variations thereof) downward in response to external manipulation by the user. etc. can be changed. For example, the lever 77 may be rotatable around a rotation axis extending in the front-rear direction or the up-down direction. The pivot shaft 78 can be changed in response to changing the lever 77 . Further, the rotating shaft 78 (eccentric portion 781) may push down the holder 73 via a separate member instead of pushing down the holder 73 directly in contact therewith.

The configuration (for example, shape, support structure, etc.) of the spindle 5 is not limited to the example of the above embodiment, and may be changed as appropriate. For example, in the embodiment described above, the tool mounting portion 51 has recesses 351 corresponding to the tip tools 91 having protrusions 911 . The tip tool 91 is fixed to the tool mounting portion 51 with its inclined surface 913 in contact with the inclined surface 513 of the tool mounting portion 51 . However, the tool mounting portion 51 may have a planar lower surface and be configured to be capable of fixing a tip tool having a planar upper surface. In this case, in order to position the tip tool in the tool attachment portion 51, the tool attachment portion 51 and the tip tool 91 may each be provided with a projection and a fitting hole. In this case, the protrusion and the fitting hole may be provided with inclined surfaces that are inclined with respect to the drive axis A1 and aligned with each other, similar to the inclined surfaces 513 and 913 of the above embodiment.

The configurations of the housing 10, the motor 41, and the transmission mechanism 45 (eg, shape, internal structure to accommodate, arrangement, etc.) can also be changed as appropriate. For example, the elastic members 11, 13, 15 interposed between the inner housing 3 and the outer housing 2 are made of a material different from that of the above embodiment (e.g., rubber, another type of synthetic resin foam). Alternatively, the shape, number, arrangement position, etc. may be different. Further, the housing 10 does not have to be a vibration-proof housing including the outer housing 2 and the inner housing 3 that are elastically connected, and may be a single-layer housing. In addition, the constituent members and connection modes of the inner housing 3 and the outer housing 2 can also be changed as appropriate. The air flow path within the housing 10 may be different from the example of the above embodiment. Also, for example, the motor 41 may be an AC motor. The motor 41 may be accommodated in the grip portion (central portion 22) of the housing 10 such that the rotation axis A2 of the output shaft 415 is orthogonal to the drive axis A1.

Furthermore, in view of the spirit of the present invention and the above-described embodiments and modifications thereof, the following aspects are constructed. The following aspects can be employed independently or in combination with the vibration tool 1 shown in the embodiment, the above modifications, or the inventions described in each claim.
[Aspect 1]
The operating member is configured to move the engaging member downward with respect to the collar in response to the releasing operation,
The second position of the engaging member is located below the first position.
[Aspect 2]
The engaging member and the first holding member are arranged above the spindle.
[Aspect 3]
The first holding member is a cylindrical member and has a concave portion that is concave radially outward from an inner peripheral surface,
The engaging member is at least partially in contact with the inner peripheral surface when arranged at the first position, and at least partially retractable into the recess when arranged at the second position. .
The groove 753 of the collar 75 is an example of a "recess" in this aspect.
[Aspect 4]
The first holding member is a tubular member,
The second holding member is slidable in the vertical direction along the inner peripheral surface of the collar.
[Aspect 5]
The first holding member is a tubular member,
The first holding member is rotatably supported by the housing via a bearing around the drive shaft [Mode 7]
The push-down member is configured to come into surface contact with the tip tool around the clamp shaft.
[Aspect 8]
The sleeve is inserted through the spindle,
The holder, on the upper side of the spindle, is configured to abut against the upper end of the sleeve and push the sleeve down during its downward movement.
[Aspect 9]
One of the clamp shaft and the engaging member has a recess, and the other of the clamp shaft and the engaging member is engageable with the recess when the engaging member is placed in the first position. has a convex portion.
The groove portion 612 and the ridge portion 717 are examples of the “recessed portion” and the “projected portion” of this aspect, respectively.

1: vibration tool, 10: housing, 11: elastic member, 13: elastic member, 15: elastic member, 2: outer housing, 20: switch holder, 203: concave portion, 21: front end, 215: projection, 22: center Part 23: Rear end 26: Holding member 260: Lighting device 261: Slide guide part 262: Rear end 263: Support leg 265: Lighting device holding part 266: Extension part 267: groove, 268: arm portion, 269: electric wire, 27: upper shell, 271: cylindrical portion, 28: lower shell, 283: protrusion, 285: cylindrical portion, 29: switch, 291: operating portion, 293: switching member, 294: operation part, 3: inner housing, 30: front end part, 301: metal housing, 302: resin housing, 303: left shell, 304: right shell, 31: first accommodating part, 311: cover, 313: concave part, 32: second accommodation portion, 321: connecting portion, 33: third accommodation portion, 335: concave portion, 35: cover portion, 351: concave portion, 36: extending portion, 37: elastic connecting portion, 371: elastic rib, 38 : rear end portion 381: battery mounting portion 382: controller housing portion 383: controller 385: arm portion 386: protrusion 41: motor 415: output shaft 43: fan 45: transmission mechanism 451: Eccentric shaft 452: Bearing 453: Bearing 454: Eccentric part 456: Drive bearing 458: Swing arm 5: Spindle 501: Bearing 502: Bearing 51: Tool mounting part 511: Concave part 513 : inclined surface 515: recessed portion 57: spring receiving member 60: clamp mechanism 61: clamp shaft 611: shaft portion 612: groove portion 615: clamp head 65: clamp spring 67: push-down mechanism 671 : push-down sleeve 673: large diameter portion 674: lower end surface 675: biasing spring 676: spring receiving member 7: locking mechanism 71: clamping member 717: protrusion 718: elastic ring 73 : holder, 731: insertion hole, 733: holding recess, 735: spring receiving portion, 737: contact portion, 75: collar, 751: bearing, 753: groove, 77: lever, 78: rotating shaft, 781: eccentric Part 801: Intake port 803, 804, 805: Intake port 807: Exhaust port 809: Exhaust port 81: Partition wall 83: Closing member 91: Tip tool 911: Convex portion 913: Inclined surface 93: battery, A1: driving shaft, A2: rotating shaft, A3: rotating shaft, P: rocking surface

Claims (10)

A work tool for performing a machining operation on a workpiece by oscillatingly driving a tip tool,
a housing;
a cylindrical spindle supported by the housing so as to be rotatable around a drive shaft that defines the vertical direction of the work tool, and having a tool mounting portion at the lower end thereof to which the tip tool can be attached and detached;
a clamp shaft disposed coaxially with and detachable from the spindle;
a first biasing member configured to bias the clamp shaft upward toward a clamping position where the lower end of the clamp shaft and the tool mounting portion clamp the tip tool;
an engagement member configured to engage the clamp shaft and hold the clamp shaft in the clamped position;
The engaging member is held so as to be relatively movable in the vertical direction between a first position where it engages with the clamp shaft in a radially immovable state and a second position where it is radially movable. a first holding member for
an operation member that can be externally operated by a user;
a pressing member arranged movably in the vertical direction with respect to the spindle;
The tool mounting portion has a first inclined surface that is inclined with respect to the drive shaft and against which a second inclined surface provided on the tip tool is pressed when the tip tool is clamped. ,
the operating member is configured to move one of the engaging member and the first holding member downward relative to the other and the spindle in response to a predetermined releasing operation;
The engaging member is configured to move from the first position to the second position with respect to the first holding member in conjunction with the releasing operation,
A work tool, wherein said one of said engaging member and said first holding member is configured to push down said tip tool through said pushing-down member in a downward movement process. . A work tool according to claim 1,
The work tool further comprises a second holding member arranged movably in the vertical direction with respect to the first holding member and holding the engaging member movably in the radial direction. A work tool according to claim 2,
The operation member is configured to move the second holding member downward with respect to the first holding member in response to the release operation,
The work tool, wherein the second holding member is configured to abut against the push-down member from above during the downward movement process. The work tool according to claim 2 or 3,
The first biasing member is a spring,
A work tool, wherein the second holding member is configured to receive one end of the spring. A work tool according to claim 4,
The operating member is configured to move the second holding member downward with respect to the first holding member in response to the releasing operation to release the clamping force applied to the clamp shaft by the spring. A work tool characterized by: The work tool according to any one of claims 1 to 5,
A work tool, wherein the push-down member is a sleeve disposed between the clamp shaft and the spindle in the radial direction. The work tool according to any one of claims 1 to 6,
A work tool, further comprising a second biasing member configured to bias the push-down member upward. A work tool according to claim 7,
The first biasing member and the second biasing member are springs having different diameters,
A work tool, further comprising a spring receiving portion common to the first biasing member and the second biasing member. The work tool according to any one of claims 1 to 8,
A work tool, wherein the first holding member is supported by the housing so as not to move in the vertical direction. The work tool according to any one of claims 1 to 9,
A work tool, further comprising a third biasing member configured to bias the engagement member radially inward.

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