power tools

Abstract

This invention provides a power tool. The vibratory tool has an inner housing (3), a spindle (5), a clamping shaft (61), a clamping spring (65), a clamping member (71), a collar (75), an operating handle (77), and a pressure sleeve (671). The collar (75) holds the clamping member (71) so that it can move relative to it in a vertical direction between a locked position and an unlocked position. The locked position is when the clamping member is engaged with the clamping shaft (61) in a state where it cannot move radially, and the unlocked position is when the clamping member can move radially. The operating handle (77) moves the clamping member (71) downward relative to the collar (75) and the spindle (5) in response to a predetermined release operation. The clamping member (71) moves from the locked position to the unlocked position relative to the collar (75) in response to the release operation. During the downward movement, the clamping member (71) presses down on the tip tool (91) via the pressure sleeve (671). Accordingly, the tip tool can be easily removed.

Description

[0001] This application is a divisional application of the invention patent application filed on November 27, 2020, with application number 202011367069.X and invention title "Electric Tools". Technical Field

[0002] The present invention relates to a power tool that drives a tip tool to swing to perform machining operations on a workpiece. Background Technology

[0003] A type of power tool is known that performs machining operations on a workpiece by driving a tip tool mounted on a spindle to oscillate within a specified angle range (so-called a vibrating tool). In such vibrating tools, a known technical solution involves setting the contact area between the spindle and the tip tool as an inclined surface extending in a direction intersecting the axis of rotation of the spindle, with the aim of easily absorbing the torque introduced into the tip tool (for example, see Japanese Patent Publication No. 2016-529118). Summary of the Invention

[0004] [The technical problem that the invention aims to solve]

[0005] In the aforementioned vibratory tool, when the tip tool is securely fixed to the spindle and driven to swing, the spindle and the tip tool sometimes become tightly bound together in the contact area (inclined surface), making it difficult to remove the tip tool. Therefore, there is room for improvement in the aforementioned vibratory tool regarding the removal of the tip tool.

[0006] The purpose of this invention is to provide a technique for easily removing the tip tool from a power tool that drives the tip tool to swing.

[0007] [Technical solutions used to solve technical problems]

[0008] According to a technical solution of the present invention, an electric tool is provided for machining a workpiece by driving the tip tool to swing. The electric tool has a housing, a spindle, a clamping shaft, a first force-applying component, a locking component, a first retaining component, an operating component, and a pressing component.

[0009] The spindle is cylindrical and supported in the housing so as to be rotatable about the drive axis. The drive axis defines the vertical direction of the power tool. The spindle has a tool mounting section at its lower end for attaching and detaching a top tool. The clamping shaft is configured to be coaxial with the spindle and can be detached from the spindle. A first force-applying member is configured to apply upward force to the clamping shaft towards a clamping position, wherein the clamping position refers to the position where the lower end of the clamping shaft and the tool mounting section clamp the top tool. A locking member is configured to engage with the clamping shaft and hold the clamping shaft in the clamping position. A first retaining member is used to retain the locking member so that it can move relative to the clamping shaft in the vertical direction between a first position and a second position. In the first position, the locking member is engaged with the clamping shaft in a state where it cannot move radially. In the second position, the locking member can move radially. The operating member is configured to be externally operated by the user. The pressing member is configured to be movable relative to the spindle in the vertical direction. The tool mounting section has a first inclined surface that is inclined relative to the drive axis. When the tip tool is clamped, the first inclined surface presses against the second inclined surface of the tip tool. The operating component is configured such that, in response to a release operation performed by the user, one of the engaging component and the first retaining component moves downward relative to the other and the main shaft. The engaging component is configured such that, in response to the release operation, the engaging component moves relative to the first retaining component from a first position to a second position. One of the engaging component and the first retaining component is configured such that, during downward movement, a pressing component presses the tip tool downward.

[0010] In the power tool of this technical solution, the tip tool is clamped with its second inclined surface pressed against the first inclined surface of the tool mounting portion, thereby being securely fixed to the spindle. When the tip tool is driven to swing in this state, the tip tool may sometimes become stuck to the tool mounting portion. In contrast, in the power tool of this technical solution, in response to the release operation of the operating member, one of the engaging member and the first retaining member moves downward relative to the other and the spindle. As a result, the engaging member moves from a first position engaged with the clamping shaft to a second position that can move radially relative to the first retaining member. That is, in response to the release operation of the operating member, the engagement between the engaging member and the clamping shaft can be released. In addition, during the downward movement of one of the engaging member and the first retaining member, the tip tool is pressed down by the pressing member. Accordingly, even when the tip tool is stuck to the tool mounting portion, the user can easily remove the tip tool and the clamping shaft together by simply performing the release operation of the operating member.

[0011] Furthermore, in this technical solution, the first inclined surface and the second inclined surface are typically configured as surfaces that incline towards the drive axis as they move upwards, and are matched to each other. Additionally, each of the first and second inclined surfaces can be entirely planar, curved, or a combination of both. Furthermore, both the first and second inclined surfaces can be annularly surrounding the drive axis. Multiple first and second inclined surfaces can be arranged circumferentially around the drive axis. Moreover, the phrase "during the downward movement" in this technical solution is not limited to the entire movement process, but can also refer to a portion of the movement process.

[0012] In one embodiment of the present invention, the power tool may further include a second retaining member configured to move vertically relative to the first retaining member and to retain the engaging member so that it can move radially. According to this embodiment, the engaging member can be stably retained so that it can move vertically and radially relative to the first retaining member.

[0013] In one embodiment of the present invention, the operating member can be configured to move the second retaining member downward relative to the first retaining member in response to a release operation. Furthermore, the second retaining member can be configured to abut against the pressing member from above during the downward movement. According to this embodiment, the second retaining member can stably hold the engaging member while pressing down on the pressing member.

[0014] In one embodiment of the present invention, the first retaining member, the second retaining member, and the engaging member can be disposed on the upper side of the spindle. The pressing member can be inserted into the spindle and protrude upward from the spindle.

[0015] In one embodiment of the present invention, the first force-applying component can be a spring. Furthermore, the second retaining component can be configured to support one end of the spring. In other words, the second retaining component can be configured as a spring support. According to this embodiment, the engaging component engaged with the clamping shaft can be forceped upward by the spring through the second retaining component, thereby holding the clamping shaft in the clamped position.

[0016] In one embodiment of the present invention, the operating member can be configured to move the second retaining member downward relative to the first retaining member in response to a release operation, thereby releasing the clamping force applied to the clamping shaft by the spring. According to this embodiment, by bearing the force of the spring on the operating member, the clamping force can be released while the second retaining member is moved downward.

[0017] In one embodiment of the present invention, the first retaining member may be a cylindrical member. The second retaining member may be capable of sliding along the inner circumferential surface of the first retaining member in the vertical direction.

[0018] In one embodiment of the present invention, the first retaining member may have a first recess that is recessed radially outward from the inner circumferential surface of the first retaining member. The second retaining member may have a second recess that is recessed radially inward from the outer circumferential surface of the second retaining member. The second recess may accommodate a locking member. The locking member may be disposed in the second recess at a first position and at least partially abut against the inner circumferential surface of the first retaining member. The locking member may be at least partially retractable from the second recess to the first recess at a second position.

[0019] In one embodiment of the present invention, the pressing component can be a sleeve, which is radially positioned between the clamping shaft and the main shaft. According to this embodiment, the tightening of the tip tool can be eliminated through a simple structure.

[0020] In one embodiment of the present invention, the pressing member may be configured to contact the top tool surface around the clamping shaft.

[0021] In one embodiment of the present invention, the power tool may further include a second force-applying component, which is configured to apply upward force to the pressing component. According to this embodiment, it is possible to prevent the tip tool from being accidentally pressed down when the operating component is released.

[0022] In one embodiment of the present invention, the first force-applying component and the second force-applying component can be springs with different diameters. Furthermore, the power tool can also have a spring support shared by the first and second force-applying components. According to this embodiment, it is possible to compactly arrange the components while suppressing an increase in the number of parts in the first and second force-applying components.

[0023] In one embodiment of the present invention, the first retaining member can be supported in the housing in a manner that prevents it from moving vertically. According to this embodiment, the first retaining member can be easily assembled.

[0024] In one embodiment of the present invention, the first retaining member can be supported on the housing by a bearing in a manner that allows it to rotate about the drive axis.

[0025] In one embodiment of the present invention, the power tool may further include a third force-applying component configured to apply a force radially inward to the engaging component. According to this embodiment, when the engaging component is positioned in the second position relative to the first retaining component, the possibility of the clamping shaft disengaging from the spindle can be reduced. Attached Figure Description

[0026] Figure 1 This is a perspective view of a vibrating tool with the operating handle positioned in the forward position.

[0027] Figure 2 This is a cross-sectional view of the vibrating tool.

[0028] Figure 3 yes Figure 2 A sectional view along line III-III (with the top tool omitted).

[0029] Figure 4 This is a three-dimensional view of the internal shell from above.

[0030] Figure 5 This is a three-dimensional view of the internal shell from below.

[0031] Figure 6 yes Figure 2 A magnified view of a portion of the image.

[0032] Figure 7 yes Figure 6 A magnified view of a portion of the image.

[0033] Figure 8 yes Figure 7 A cross-sectional view of line VIII-VIII.

[0034] Figure 9 It corresponds to Figure 7 A cross-sectional view of the device when the operating handle is positioned in the upper position.

[0035] Figure 10 It corresponds to Figure 8 A cross-sectional view of the device when the operating handle is positioned in the upper position.

[0036] Figure 11 This is a bottom view of the vibratory tool after the lower housing has been removed.

[0037] Figure 12 yes Figure 6 A sectional view of line XII-XII.

[0038] Figure 13 This is a 3D view of the vibrating tool after the upper housing has been removed.

[0039] Figure 14 This is a top view of the vibratory tool after the upper housing has been removed.

[0040] Figure 15 It corresponds to Figure 8 A sectional view, and a sectional view used to illustrate the configuration of the operating handle and rotating shaft in the modified example.

[0041] Figure 16 This is an exploded perspective view of the operating handle and rotating shaft of the modified example.

[0042] [Explanation of reference numerals in the attached figures]

[0043] 1: Vibrating tool; 10: Housing; 11: Elastic component; 13: Elastic component; 15: Elastic component; 2: Outer housing; 20: Switch retainer; 203: Recess; 21: Front end; 215: Protrusion; 22: Central part; 23: Rear end; 26: Retaining component; 260: Lighting device; 261: Sliding guide; 262: Rear end; 263: Support leg; 265: Lighting device retainer; 266: Extension; 267: Groove; 268: Arm; 269: Wire; 27: Upper housing; 271: Cylindrical part; 28: Lower housing; 283: Protrusion; 285: Cylindrical part; 29: Switch; 291: Working part; 293: Switching component; 294: Operating part; 3: Inner 30: Front end; 301: Metal housing; 302: Resin housing; 303: Left side housing; 304: Right side housing; 31: First storage section; 311: Cover; 313: Recess; 32: Second storage section; 321: Connecting part; 33: Third storage section; 335: Recess; 35: Cover; 351: Recess; 36: Extension; 37: Elastic connecting part; 371: Elastic rib; 38: Rear end; 381: Battery mounting part; 382: Controller storage section; 383: Controller; 385: Arm; 386: Protrusion; 41: Motor; 415: Output shaft; 43: Fan; 45: Transmission mechanism; 451: Eccentric shaft; 452: Bearing; 453: Bearing; 454: Eccentric shaft 456: Drive bearing; 458: Swing arm; 5: Spindle; 501: Bearing; 502: Bearing; 51: Tool mounting part; 511: Recess; 513: Inclined surface; 515: Recess; 57: Spring support component; 60: Clamping mechanism; 61: Clamping shaft; 611: Shaft part; 612: Groove part; 615: Chuck; 65: Clamping spring; 67: Pressing mechanism; 671: Pressing sleeve; 673: Large diameter part; 674: Lower end face; 675: Force spring; 676: Spring support component; 7: Locking mechanism; 71: Clamping component; 717: Protrusion; 718: Elastic ring; 73: Retaining member; 731: Insertion hole; 733: Retaining recess; 735: Spring support part; 737: 75: Collar; 751: Bearing; 753: Groove; 77, 770: Operating handle; 771: Arm; 772: Engaging part; 773: Circular plate part; 774: Cylindrical part; 775: Protrusion; 776: Inner flange; 777: Outer surface; 778: Inner surface; 779: Holding part; 78, 780: Rotating shaft; 781: Eccentric part; 783: Engaging groove; 801: Air inlet; 803, 804, 805: Air inlet; 807: Exhaust port; 809: Exhaust port; 81: Partition wall; 83: Sealing component; 91: Top tool; 911: Protrusion; 913: Inclined surface; 93: Battery; A1: Drive shaft; A2: Rotation shaft; A3: Rotation shaft; P: Swing surface. Detailed Implementation

[0044] The vibratory tool 1 according to the embodiment will now be described with reference to the accompanying drawings. Furthermore, the vibratory tool 1 is an example of an electrically powered work tool that drives a tip tool 91 to swing to perform processing operations on a workpiece (not shown).

[0045] First, let's describe the general structure of the vibration tool 1. For example... Figure 1 and Figure 2 As shown, the vibrating tool 1 has an elongated housing (also called the tool body) 10. An elongated spindle 5 and a motor 41 serving as a drive source are housed in one end of the housing 10 along its long axis. The spindle 5 is configured such that its long axis intersects (more specifically, is approximately orthogonal) the long axis of the housing 10. One axial end of the spindle 5 protrudes from the housing 10 and protrudes outwards. This end constitutes a tool mounting section 51 for detaching and attaching the tip tool 91. A battery 93 for powering the motor 41 is detachably mounted and detachable at the other end of the housing 10 along its long axis. The vibrating tool 1 is configured such that the spindle 5 reciprocates within a predetermined angular range around the drive axis A1 by the power of the motor 41, thereby causing the tip tool 91 to oscillate on the oscillating surface P.

[0046] In the following description, for convenience, the direction of the vibrating tool 1 is defined as the vertical direction of the drive axis A1. In the vertical direction, the side of the spindle 5 with the tool mounting portion 51 is defined as the lower side, and the opposite side is defined as the upper side. The direction orthogonal to the drive axis A1 and approximately corresponding to the long axis of the housing 10 is defined as the front-back direction of the vibrating tool 1. In the front-back direction, one end of the housing 10 housing the spindle 5 is defined as the front side, and the other end with the battery 93 is defined as the rear side. Furthermore, the direction orthogonal to the vertical and front-back directions is defined as the left-right direction.

[0047] The detailed structure of the vibration tool 1 will be described below.

[0048] First, let's describe the casing 10. For example... Figures 1-3 As shown, the housing 10 of this embodiment is configured as a so-called vibration-damping housing. The housing 10 includes an elongated outer housing 2 that forms the outer contour of the vibration tool 1, and an elongated inner housing 3 that is housed in the outer housing 2.

[0049] In this embodiment, the outer housing 2 is formed by connecting an upper housing 27, a lower housing 28, and a switch retainer 20, which are formed separately from each other. Each of the upper housing 27, the lower housing 28, and the switch retainer 20 is a component integrally molded from synthetic resin. Although detailed illustrations are omitted, the outer housing 2 is formed by overlapping the upper housing 27 and the lower housing 28 in the vertical direction with the switch retainer 20 disposed in the middle, and by connecting them with screws at multiple locations.

[0050] In the front-to-back 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.

[0051] The front end portion 21 is formed in a generally rectangular box shape. The front end portion 30 of the inner housing 3 is disposed inside the front end portion 21. An operating handle 77 is rotatably supported on the upper front end portion of the front end portion 21. The operating handle 77 is used for locking by the locking mechanism 7 described later (see reference). Figure 7 This is an operating component that enables the fixing (locking) and unlocking of the top tool 91. An opening is provided on the upper wall of the front end 21. A sliding operating part 294 is exposed through this opening, allowing for external operation. The operating part 294 is an operating component used to switch the switch 29 for starting the motor 41 between an on and off state.

[0052] The rear end portion 23 is formed into a cylindrical shape that expands rearward (increases the cross-sectional area). Inside the rear end portion 23, there is an elastic connecting portion 37 of the inner shell 3 and the rear end portion 38.

[0053] The central portion 22 is cylindrical. The central portion 22 extends in a straight line along the front-to-back direction. The central portion 22 constitutes a grip that can be held by the user. Therefore, the central portion 22 is made thinner than the front portion 21 and the rear portion 23 so that it is easy for the user to hold.

[0054] like Figures 2-6 As shown, 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. The metal housing 301 is a single component made of metal. The resin housing 302 is formed by connecting a left housing 303 and a right housing 304, both made of synthetic resin. The inner housing 3 is formed by connecting the metal housing 301 with screws at multiple locations while the rear end of the metal housing 301 (the connecting portion 321 described later) is clamped from the left and right directions by the left housing 303 and the right housing 304.

[0055] The inner housing 3 in the front-to-back direction includes a front end portion 30, an extension portion 36, an elastic connecting portion 37, and a rear end portion 38.

[0056] The front end portion 30 is used to house the main shaft 5, the motor 41, and the transmission mechanism 45. The front end portion 30 includes a first housing section 31, a second housing section 32, a connecting section 321, a third housing section 33, and a cover section 35. Furthermore, the metal housing 301 is composed of the parts of the front end portion 30 except for the cover section 35 (i.e., the first housing section 31, the second housing section 32, the connecting section 321, and the third housing section 33). The resin housing 302 is composed of the cover section 35, the extension section 36 (described later), the elastic connecting section 37, and the rear end portion 38.

[0057] The first housing section 31 is used to house the main shaft 5. The first housing section 31 is formed as a cylinder extending vertically. The opening at the upper end of the first housing section 31 is covered by a cover 311. The cover 311 is fixed to the first housing section 31 by a pin. The second housing section 32 is used to house the motor 41. The second housing section 32 is formed as a cylinder with a diameter larger than that of the first housing section 31. The second housing section 32 is located behind the first housing section 31. Furthermore, the second housing section 32 is shorter than the first housing section 31 in the vertical direction. The lower end of the second housing section 32 is located above the lower end of the first housing section 31. The connecting section 321 is a plate-shaped portion and is connected to the rear end of the second housing section 32, protruding rearward. The connecting section 321 is disposed between the left housing 303 and the right housing 304 and is fixed by screws. The third receiving section 33 is used for the receiving transmission mechanism 45. The third receiving section 33 is located behind the first receiving section 31 and below the second receiving section 32. The third receiving section 33 communicates with the first receiving section 31 and the second receiving section 32. The cover section 35 is a section that covers the opening at the upper end of the second receiving section 32.

[0058] The extension 36 is a cylindrical portion that connects to the rear end of the front end portion 30 (specifically, the second receiving portion 32) and extends rearward. The length of the extension 36 in the front-rear direction is set to be equal to the length of the central portion (holding portion) 22 in the front-rear direction. The extension 36 is substantially entirely received within the central portion 22. The rear end of the extension 36 is an open end. That is, the rear end of the extension 36 is defined as an opening.

[0059] The elastic connection portion 37 extends rearward from the rear end of the extension portion 36, connecting the extension portion 36 and the rear end portion 38 in a relatively movable manner. The elastic connection portion 37 includes a plurality of elastic ribs 371 connecting the extension portion 36 and the rear end portion 38 along the front-rear direction. In this embodiment, the four elastic ribs 371 are arranged separately about the long axis of the inner housing 3 extending along the front-rear direction. Compared to other parts of the inner housing 3, the elastic ribs 371 are formed into a shape that is easily elastically deformable and are made of a material with a low elastic modulus. As a result, it is possible to suppress the transmission of vibrations generated at the front end portion 30 to the rear end portion 38 during processing.

[0060] The rear end portion 38 is formed in a generally rectangular box shape. Furthermore, as described above, the rear end portion 38 is disposed inside the rear end portion 23 of the outer housing 2. A gap is formed between the outer peripheral surfaces of the rear end portion 23 and the rear end portion 38.

[0061] The outer shell 2 and the inner shell 3, constructed as described above, are elastically connected and can move relative to each other. The elastic connection structure between the outer shell 2 and the inner shell 3 will be described in detail later.

[0062] The internal structure of the inner housing 3 will now be described in sequence as follows: the front end 30, the rear end 38, the elastic connecting part 37, and the extension part 36.

[0063] First, the internal structure of the front end 30 will be explained. For example... Figure 6 As shown, the front end 30 houses the main shaft 5, motor 41, transmission mechanism 45, clamping mechanism 60, and pressing mechanism 67.

[0064] Explain spindle 5. (For example...) Figure 7 As shown, the spindle 5 is a generally cylindrical elongated component. In this embodiment, the spindle 5 is supported by two bearings 501 and 502 so that it can rotate about the drive axis A1. The bearings 501 and 502 are held in the lower part of the first receiving part 31. As described above, the lower end of the spindle 5 is configured as a tool mounting part 51 for detachable top tool 91.

[0065] In this embodiment, the tool mounting portion 51 is configured as a flange protruding radially outward relative to the drive axis A1. The tool mounting portion 51 has an inclined surface 513, which is inclined relative to the direction intersecting with the drive axis A1. More specifically, an upwardly recessed portion 511 is formed at the lower end of the tool mounting portion 51. The inclined surface 513 is a portion of the surface of the recess 511 and is configured as an inclined surface that is inclined in a direction away from the drive axis A1 (radially outward) as it moves downward. On the other hand, the tip tool 91 (scraper, scraper, grinding pad, abrasive pad, etc.) that can be mounted on the vibrating tool 1 of this embodiment has a protrusion 911 that can be fitted into the recess 511. Moreover, a portion of the upper surface of the protrusion 911 is configured as an inclined surface 913 that matches the inclined surface 513. In this embodiment, the tip tool 91 is clamped by the tool mounting part 51 and the chuck 615 of the clamping shaft 61 (described later) with the inclined surface 913 abutting against the inclined surface 513, thereby fixing it relative to the spindle 5. The fixing of the tip tool 91 relative to the spindle 5 will be described in detail later. Furthermore, a recess 515 is provided in the center of the recess 511. The recess 515 has a circular cross-section and extends further upward from the recess 511.

[0066] Explanation of motor 41. For example... Figure 6As shown, the motor 41 in this embodiment is a brushless DC motor. The motor 41 has 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 section 32 such that the rotation axis A2 of the output shaft 415 extends parallel (i.e., vertically) to the drive axis A1. The output shaft 415 protrudes downward from the rotor.

[0067] The transmission mechanism 45 is described. The transmission mechanism 45 is configured to transmit the rotational motion of the output shaft 415 to the main shaft 5, causing the main shaft 5 to reciprocate within a specified angular range around the drive axis A1. For example... Figure 6 As shown, the transmission mechanism 45 has an eccentric shaft 451, a drive bearing 456 and a swing arm 458, wherein the eccentric shaft 451 has an eccentric portion 454.

[0068] An eccentric shaft 451 is a shaft coaxially connected to the output shaft 415 of the motor 41. The eccentric shaft 451 is fixed to the outer periphery of the output shaft 415. The eccentric shaft 451 extends to the lower end of the third housing section 33. The eccentric shaft 451 is supported by two bearings 452 and 453 to enable rotation. The bearings 452 and 453 are respectively held at the lower ends of the second housing section 32 and the third housing section 33. The eccentric shaft 451 has an eccentric portion 454 that is eccentric relative to the rotation axis A2. The inner ring of the drive bearing 456 is mounted on the eccentric portion 454. A swing arm 458 is a component for connecting the drive bearing 456 to the main shaft 5. The swing arm 458 extends across the first housing section 31 and the third housing section 33. Since it is a known structure, its detailed illustration is omitted, but one end of the swing arm 458 is formed into a ring shape and is fixed to the outer periphery of the main shaft 5 between bearings 501 and 502. The other end of the swing arm 458 is formed into a shape divided into two strands and is configured to abut against the outer peripheral surface of the outer ring of the drive bearing 456 from the left and right.

[0069] When the motor 41 is driven, the eccentric shaft 451 and the output shaft 415 rotate together. Since the center of the eccentric portion 454 moves about the rotation axis A2 with the rotation of the eccentric shaft 451, the drive bearing 456 also moves about the rotation axis A2. As a result, the swing arm 458 swings about the drive axis A1 of the spindle 5 within a specified angle range. The spindle 5 reciprocates about the drive axis A1 within a specified angle range as the swing arm 458 swings. Consequently, the top tool 91, fixed to the spindle 5, is driven to swing about the drive axis A1 on the swing surface P, thereby enabling machining operations.

[0070] A fan 43 is fixed to the upper end of the eccentric shaft 451. In this embodiment, the fan 43 is a centrifugal fan. The fan 43 is configured to rotate about the rotation axis A2 as driven by the motor 41, drawing air in from above towards the rotation axis A2 and expelling it radially outward. The rotation of the fan 43 generates an airflow within the housing 10 for cooling the motor 41. Furthermore, the airflow path within the housing 10 will be described in detail later.

[0071] The clamping mechanism 60 will now be described. The clamping mechanism 60 is configured to fix the tip tool 91 to the tool mounting portion 51 in a manner that allows it to rotate integrally with the spindle 5. For example... Figure 7 and Figure 8 As shown, in this embodiment, the clamping mechanism 60 has a clamping shaft 61, a clamping spring 65, and a locking mechanism 7.

[0072] The clamping shaft 61 is a generally cylindrical elongated component. The clamping shaft 61 is coaxial with the main shaft 5 and is detachably inserted into the main shaft 5. The clamping shaft 61 has a rod-shaped shaft portion 611 and a flange-shaped collet 615. The shaft portion 611 extends along the drive axis A1. The collet 615 is connected to the lower end of the shaft portion 611. Furthermore, a groove portion 612 is provided at the upper end of the shaft portion 611. In the groove portion 612, multiple grooves are formed along the entire circumference of the clamping shaft 61 in the vertical direction.

[0073] The clamping spring 65 is a force-applying component that applies a force upward relative to the spindle 5 to the clamping shaft 61, thereby applying a clamping force to the clamping shaft 61 for clamping the tip tool 91. In this embodiment, the clamping spring 65 is configured to apply an upward force to the clamping shaft 61 via the locking mechanism 7 (specifically, the retainer 73 and the clamping member 71, described later). More specifically, the clamping spring 65 is a compression coil spring. The clamping spring 65 is disposed in a compressed state between the spring support member 57 disposed on the upper side of the spindle 5 and the retainer 73, described later. Furthermore, the spring support member 57 rotates integrally with the spindle 5.

[0074] The locking mechanism 7 is configured to hold (lock) the clamping shaft 61 in a clamping position that can clamp the tip tool 91. Figure 7 and Figure 8 The locking mechanism 7 is located in the first receiving part 31 and is positioned above the main shaft 5. In this embodiment, the locking mechanism 7 includes a pair of clamping members 71, a retaining member 73, an elastic ring 718, and a collar 75.

[0075] A pair of clamping members 71 are arranged facing each other across the drive shaft A1. The radially inner surface of the clamping member 71 is formed as a curved surface corresponding to the outer peripheral surface of the shaft portion 611. Furthermore, a protrusion portion 717 is provided on this curved surface. Multiple circumferentially extending protrusions are formed on the protrusion portion 717 in the vertical direction. The protrusion portion 717 is configured to engage with a groove portion 612 of the clamping shaft 61. Additionally, the upper and lower ends of the clamping member 71 protrude radially outward from the central portion. In other words, a circumferentially extending groove is provided on the outer periphery of the central portion of the clamping member 71 in the vertical direction.

[0076] The retainer 73 is configured to hold a pair of clamping members 71 so that they can move radially relative to the drive axis A1. In this embodiment, the retainer 73 is integrally formed as a cylindrical member with a diameter larger than the shaft portion 611 of the clamping shaft 61. The retainer 73 has an insertion hole 731 and a pair of retaining recesses 733.

[0077] The insertion hole 731 is a circular recess extending upward from the lower surface of the retainer 73 along the drive axis A1 and closing at its upper end. The insertion hole 731 has a diameter slightly larger than the shaft portion 611 of the clamping shaft 61. The upper end of the shaft portion 611 can be inserted into the insertion hole 731.

[0078] A pair of retaining recesses 733 are disposed at the center of the retainer 73 in the vertical direction. The pair of retaining recesses 733 are symmetrical about the drive axis A1 and extend radially inward from the outer periphery of the retainer 73 (toward the drive axis A1). The radially inward end of each retaining recess 733 communicates with an insertion hole 731. The retaining recesses 733 have a shape that matches the clamping member 71. A pair of clamping members 71 are respectively disposed within the pair of retaining recesses 733 in a manner that allows them to move radially.

[0079] More specifically, a pair of clamping members 71 are capable of engaging in a radial position near the drive axis A1. Figure 7 The position shown is the same as the disengagement position, which is further away from the drive axis A1 (radially outward from the engagement position). Figure 9 The clamping members 71 can move between the positions shown. When positioned in the engaged position, the protrusions 717 of the pair of clamping members 71 engage with the grooves 612 of the clamping shaft 61. Furthermore, when positioned in the engaged position, the outer peripheral surfaces of the clamping members 71 are positioned approximately at the same level as the outer peripheral surfaces of the retaining members 73, and do not protrude radially outward from the retaining recess 733. When positioned in the disengaged position, the protrusions 717 cannot engage with the grooves 612. Furthermore, when positioned in the disengaged position, the outer peripheral surfaces of the clamping members 71 slightly protrude radially outward from the retaining recess 733.

[0080] Additionally, the lower end of the retainer 73 has a flange-shaped spring support portion 735 that protrudes radially outward. The lower surface of the spring support portion 735 abuts against the upper end of the clamping spring 65. When the clamp is released, the lower surface of the lower central portion of the retainer 73 (the annular portion around the insertion hole 731) functions as an abutment portion 737 against the pressure sleeve 671, which will be described in detail later.

[0081] An elastic ring 718 is mounted in a groove provided on the outer periphery of a pair of clamping members 71. The elastic ring 718 applies force to the pair of clamping members 71 at a radially inward engaging position. In this embodiment, the elastic ring 718 is a ring-shaped member made of rubber.

[0082] The collar 75 is a cylindrical component. The collar 75 holds the retainer 73 and the clamping member 71 in a manner that allows them to move relative to the collar 75 along the drive axis A1 (i.e., in the vertical direction). The retainer 73 is disposed inside the collar 75 and is capable of sliding vertically along the inner circumferential surface of the collar 75. The collar 75 is supported such that it cannot move vertically relative to the inner housing 3 and is rotatable about the drive axis A1. More specifically, the collar 75 is rotatably supported by a bearing 751. The bearing 751 is fixed radially outward of the collar 75 and inside the upper end of the first receiving portion 31. By disposing the collar 75 above the main shaft 5 and inside the first receiving portion 31, rather than inside the main shaft 5, assembly of the collar 75 is facilitated.

[0083] In this embodiment, the collar 75 is configured to either prohibit or allow the clamping member 71 to move from the engaged position to the disengaged position based on its relative positional relationship with the clamping member 71 in the vertical direction. In other words, the clamping member 71 can move vertically relative to the collar 75 between a position where it cannot move from the engaged position (hereinafter referred to as the locked position) and a position where it can move radially from the engaged position to the disengaged position (hereinafter referred to as the unlocked position).

[0084] More specifically, the collar 75 has an inner diameter approximately equal to that of the retainer 73. An annular groove 753 is provided at the center of the collar 75 in the vertical direction. The groove 753 is recessed radially outward from the inner circumferential surface of the collar 75. Therefore, as... Figure 7 As shown, when the outer peripheral surface of the clamping member 71 (specifically, the outer peripheral surfaces of the upper and lower ends) abuts against the inner peripheral surface of the collar 75 (excluding the groove 753), the clamping member 71 cannot move radially outward from the engaged position. That is, the clamping member 71 is in the locked position at this time. On the other hand, as Figure 9As shown, with the upper end of the clamping member 71 facing the groove 753 and the lower end of the collar 75 facing the groove on the outer periphery of the clamping member 71, the clamping member 71 can move radially outward from the engaged position. That is, at this time, the clamping member 71 is in the unlocked position. As described above, in this embodiment, the clamping member 71 is held by the retaining member 73, and therefore can move stably relative to the collar 75 in the vertical and radial directions.

[0085] Furthermore, the relative positional relationship between the clamping member 71 and the collar 75 in the vertical direction changes in response to the operation of the operating handle 77. This will be explained in detail later.

[0086] The pressing mechanism 67 will now be described. The pressing mechanism 67 is configured to press the tip tool 91 downward relative to the spindle 5 in response to the action of the clamping mechanism 60 (specifically, the downward movement of the retainer 73). Figure 7 and Figure 8 As shown, in this embodiment, the pressing mechanism 67 includes a pressing sleeve 671 and a force-applying spring 675. The pressing sleeve 671 is configured to move in the vertical direction relative to the main shaft 5. The force-applying spring 675 applies force to the pressing sleeve 671 upward relative to the main shaft 5.

[0087] The pressure sleeve 671 is coaxially inserted into the main shaft 5. Furthermore, the pressure sleeve 671 is configured such that the clamping shaft 61 can be inserted therein. That is, the pressure sleeve 671 is radially positioned between the main shaft 5 and the clamping shaft 61.

[0088] More specifically, the pressure sleeve 671 is an elongated cylindrical component. The pressure sleeve 671 has an outer diameter approximately equal to the inner diameter of the main shaft 5, and an inner diameter approximately equal to the diameter of the shaft portion 611. The length of the pressure sleeve 671 is longer than the main shaft 5, and the upper portion of the pressure sleeve 671 protrudes upward from the main shaft 5. The length of the clamping shaft 61 is longer than the pressure sleeve 671, and when it is inserted into the pressure sleeve 671, the chuck 615 and the groove 612 protrude from the lower and upper ends of the pressure sleeve 671, respectively. The lower end of the pressure sleeve 671 is configured as a large-diameter portion 673 with a larger diameter than the other portions. The large-diameter portion 673 is configured as a recess 515 that can fit into the lower end of the main shaft 5. The lower end face 674 of the large-diameter portion 673 is an annular plane.

[0089] The force-applying spring 675 is a compression coil spring with a smaller diameter than the clamping spring 65. The force-applying spring 675 is positioned inside the clamping spring 65. The lower end of the force-applying spring 675 abuts against the spring support member 57. That is, the spring support member 57 is used as a shared spring support for both the clamping spring 65 and the force-applying spring 675. This allows for a compact configuration of the clamping spring 65 and the force-applying spring 675 while minimizing the increase in the number of components.

[0090] The upper end of the force-applying spring 675 abuts against the spring support member 676. The spring support member 676 is disposed on the upper side of the spring support member 57. The spring support member 676 is externally mounted to the pressure sleeve 671 in a manner that allows it to move vertically relative to the spring support member 57. The upper end of the spring support member 676 abuts against a protrusion provided on the outer periphery of the pressure sleeve 671 from below. With this structure, the force-applying spring 675 applies upward force to the pressure sleeve 671 via the spring support member 676.

[0091] The pressure sleeve 671 is always held in its uppermost position by the force of the force-applying spring 675. The uppermost position of the pressure sleeve 671 is where the shoulder (stepped portion) of the large-diameter portion 673 abuts against the shoulder (stepped portion) of the recess 515 of the spindle 5. When the pressure sleeve 671 is positioned in its uppermost position, its lower end (lower end face 674) is positioned above the top tool 91 (more specifically, the upper surface of the protrusion 911) that is clamped between the tool mounting portion 51 and the chuck 615. In addition, the upper end of the pressure sleeve 671 is positioned below the lower surface (abutment portion 737) of the retainer 73.

[0092] The clamping mechanism 60 and pressing mechanism 67 configured as described above are designed to operate in response to rotation of the operating handle 77 by the user. More specifically, the relative positional relationship between the clamping member 71 and the retaining member 73 and the collar 75 in the vertical direction changes in response to rotation of the operating handle 77. Furthermore, the pressing sleeve 671 also moves in response to movement of the retaining member 73. The operation of rotation of the operating handle 77 and the operation of the clamping mechanism 60 and the pressing mechanism 67 will now be explained.

[0093] First, let's explain the operating handle 77. For example... Figure 1 and Figure 8 As shown, the operating handle 77 is generally U-shaped, and both ends of the operating handle 77 are rotatably supported on the upper part of the front end 21 of the outer housing 2. The operating handle 77 can, as Figure 1 and Figure 7 As shown, the central portion of the operating handle 77 abuts against the front surface of the front end portion 21 (hereinafter referred to as the front position) and as shown Figure 9 and Figure 10The central portion is rotated between a position above the front end portion 21 (hereinafter referred to as the upper position), as shown. The operating handle 77 is connected to the rotating shaft 78. The rotating shaft 78 can rotate about the rotation axis A3 extending in the left-right direction. The rotating shaft 78 extends in the left-right direction above the locking mechanism 7 (holding member 73). The rotating shaft 78 is inserted into the through hole of the cover 311 that passes through the front end portion 30 of the inner housing 3 in the left-right direction. The two ends of the rotating shaft 78 are connected to the two ends of the operating handle 77 and are rotatably supported on the outer housing 2. The rotating shaft 78 rotates integrally with the operating handle 77 as the operating handle 77 is rotated. An eccentric portion (cam portion) 781 is provided in the central portion (on the drive axis A1) of the rotating shaft 78, which is eccentric relative to the rotation axis A3.

[0094] When the operating handle 77 is positioned in the forward position, such as Figure 7 and Figure 8 As shown, the smaller diameter portion (short diameter portion) of the eccentric part 781 is separated from the retainer 73 and positioned above the retainer 73. Accordingly, the rotating shaft 78 is not subjected to the force of the clamping spring 65. A pair of clamping members 71 are positioned in a locked position relative to the collar 75, clamping the clamping shaft 61 in the engaged position, and together with the retainer 73, are subjected to an upward force by the clamping spring 65, thereby holding the clamping shaft 61 in its uppermost position. The collet 615 presses the tip tool 91 from below against the tool mounting portion 51 by the force of the clamping spring 65, fixing it to the spindle 5. That is, the collet 615 and the tool mounting portion 51 clamp the tip tool 91 together. Therefore, the uppermost position of the clamping shaft 61 is also referred to as the clamping position.

[0095] On the other hand, when the operating handle 77 is rotated from the front position to the upper position and is positioned in the upper position, during this process, such as Figure 9 and Figure 10 As shown, the larger diameter portion (long diameter portion) of the eccentric part 781 contacts the upper end of the retainer 73 from above, thereby further compressing the clamping spring 65 and causing the retainer 73 to move downward relative to the spindle 5 and the collar 75. This releases the clamping force (the force pressing the tip tool 91 upward relative to the spindle 5) exerted on the chuck 615 by the clamping spring 65. Therefore, the operation of rotating the operating handle 77 from the front position to the upper position is also referred to as the clamp release operation.

[0096] In response to the clamping release operation, the clamping member 71, held by the retainer 73, moves downward relative to the collar 75, thereby being positioned in the unlocked position. That is, the locking mechanism 7 releases the locking of the clamping shaft 61. As described above, the clamping member 71 is forced into the engaging position by the elastic ring 718 mounted in the groove on the outer periphery. Therefore, unless an external force resists the force of the elastic ring 718 and causes the clamping member 71 to move radially outward from the engaging position, the clamping shaft 61 will be temporarily held in this position by the clamping member 71 and will not disengage from the spindle 5. When the user pulls down the clamping shaft 61, the clamping member 71 moves to the released position, so that the user can pull the clamping shaft 61 out of the spindle 5 to replace the tip tool 91.

[0097] Furthermore, when the retainer 73 moves downward relative to the spindle 5 in response to the clamping release operation, during this process, the abutting portion 737 of the retainer 73 abuts against the upper end of the pressure sleeve 671, which is positioned at the uppermost position, thereby resisting the force of the force spring 675 and pressing down on the pressure sleeve 671. That is, in addition to retaining the clamping member 71, the retainer 73 also has the function of pressing down on the pressure sleeve 671. When the tip tool 91 abuts against the inclined surface 513 at the inclined surface 913 and is pressed down on the tool mounting portion 51 by the chuck 615 from below (see reference). Figure 7 When driven to swing, the tip tool 91 may sometimes become tight against the tool mounting portion 51. In such cases, the large-diameter portion 673 of the pressure sleeve 671 abuts against the tip tool 91 from above during descent, pressing down on the tip tool 91, thereby eliminating the tightness of the tip tool 91. Furthermore, in this embodiment, the lower end face 674 of the pressure sleeve 671 contacts the tip tool 91 surface around the shaft portion 611, and presses down on the tip tool 91 in a balanced manner, thus more reliably eliminating the tightness of the tip tool 91.

[0098] The action of installing the clamping shaft 61 onto the spindle 5 and clamping the tip tool 91 is essentially the reverse of the action of removing it. With the operating handle 77 in the upper position and the clamping member 71 in the unlocked position relative to the collar 75, the user inserts the clamping shaft 61, which is inserted through the tip tool 91, into the spindle 5 (pressing sleeve 671). The user moves the clamping shaft 61 upward until the upper end of the clamping shaft 61 abuts against the retainer 73. During this process, the clamping member 71 moves to the released position and returns to the engaged position by the force of the elastic ring 718. The protrusion 717 engages with the groove 612, and the clamping shaft 61 is temporarily held by the clamping member 71.

[0099] When the user operates the handle 77 to rotate it from the upper position to the front position, the force exerted by the clamping spring 65 on the rotating shaft 78 via the eccentric portion 781 is released. As a result, the retaining member 73 and the clamping member 71 are exerted upward force by the clamping spring 65 and move upward relative to the collar 75. When the clamping member 71 moves relative to the collar 75 to the locked position, the clamping shaft 61 also returns to the clamping position.

[0100] The internal structure of the rear end 38 will be described below. For example... Figures 2-4 As shown, in this embodiment, the rear portion of the rear end 38 is configured as a battery mounting portion 381. The battery mounting portion 381 has a locking structure that allows the battery 93 to slide and a terminal electrically connected to the battery 93. Since the battery mounting portion 381 and its structure are known technology, a detailed description is omitted. The front portion of the rear end 38 is configured as a controller housing portion 382. A controller 383, including a control circuit, is housed in the controller housing portion 382. The controller 383 is configured to drive the motor 41 when the switch 29 is in the ON state.

[0101] Explain the internal structure of the elastic connection part 37. For example... Figures 2-4 As shown, a switch retainer 20 is disposed in the internal space of the elastic connection portion 37 (the space area surrounded circumferentially by the elastic rib 371). The switch retainer 20 is a component configured to retain the switch 29. Furthermore, although the switch retainer 20 is disposed in the internal space of the elastic connection portion 37, it is fixed to the upper housing 27 and the lower housing 28 by screws, thus becoming part of the outer housing 2.

[0102] Explain the internal structure of extension 36. For example... Figures 2-4 As shown, in this embodiment, the main shaft 5, motor 41, and transmission mechanism 45 are disposed at the front end 30, and the battery mounting portion 381 is disposed at the rear end 38. Therefore, the number of components disposed on the extension portion 36 can be minimized. Thus, although wires and connecting terminals (not shown) for connecting the controller 383 and the motor 41 are disposed on the extension portion 36, no other components are specifically disposed thereon. Therefore, in order to make the extension portion 36 as thin as possible to easily grip the central portion (gripping portion) 22 of the outer housing 2, the extension portion 36 is formed to be thinner than the front end 30, the elastic connecting portion 37, and the rear end 38.

[0103] The elastic connection structure between the outer housing 2 and the inner housing 3 will now be described. In this embodiment, the outer housing 2 and the inner housing 3 are elastically connected at multiple locations. Specifically, elastic members are respectively sandwiched between the front end 21 and the front end 30, between the rotation shaft 78 supported on the outer housing 2 and the front end 30, and between the switch retainer 20 and the rear end 38.

[0104] First, the elastic connection structure between the front end 21 and the front end 30 will be explained.

[0105] like Figure 5 , Figure 6 , Figure 11 and Figure 12 As shown, two circularly shaped recesses 335 are provided on the lower wall of the front end portion 30. More specifically, the recesses 335 are provided on the lower wall of the third receiving portion 33 of the swing arm 458 for receiving the transmission mechanism 45. The recesses 335 are formed to be recessed upward from the lower surface of the third receiving portion 33. The two recesses 335 are arranged in the left-right direction. In addition, in the front-rear direction, the two recesses 335 are arranged between the drive axis A1 of the main shaft 5 and the rotation axis A2 of the output shaft 415 of the motor 41 (more specifically, between the bearing 502 and the bearing 453). On the other hand, as Figure 12 As shown, two cylindrical protrusions 215 are provided on the lower wall of the front end portion 21. The protrusions 215 protrude upward from the lower wall of the front end portion 21 in a manner that faces the central portion of the recess 335 of the inner housing 3.

[0106] An elastic member 11 is embedded in each recess 335. The elastic member 11 is formed in a cylindrical shape. A protrusion 215 is embedded inside the elastic member 11 and is covered by the elastic member 11 along its entire circumference. The height of the elastic member 11 is set to be greater than the depth of the recess 335 and the height of the protrusion 215. Accordingly, a gap is provided between the inner shell 3 and the outer shell 2 in the vertical direction. Thus, the cylindrical elastic member 11 is sandwiched between the inner shell 3 and the outer shell 2 with its outer peripheral surface and upper end surface in contact with the inner shell 3 and its inner peripheral surface and lower end surface in contact with the outer shell 2. Furthermore, in this embodiment, the elastic member 11 is formed of a polyurethane-based resin having an ultra-micro foam structure.

[0107] Explain the elastic connection structure between the rotating shaft 78 and the front end 30.

[0108] like Figure 8As shown, the left and right ends of the rotating shaft 78 are rotatably supported on the upper left and upper right ends of the front end 21, respectively. The rotating shaft 78 extends through the cover 311 of the front end 30 in the left-right direction within the upper end of the front end 21. Recesses 313 are provided on the left and right walls of the cover 311. Each recess 313 is a circularly shaped recess that is recessed into the inner side (center side in the left-right direction) of the front end 30. On the other hand, two cylindrical elastic members 13 are fitted onto the rotating shaft 78. The two elastic members 13 are disposed on the inner side (center side in the left-right direction) of the left and right walls of the front end 21. The inner portion of each elastic member 13 is embedded in the recess 313 of the cover 311. Each elastic member 13 is pressed against the outer housing 2 through a gasket on its outer side. Thus, the outer peripheral surface and inner end face of the cylindrical elastic member 13 are in contact with the inner housing 3. The inner circumferential surface of the elastic member 13 contacts the rotating shaft 78 connected to the outer housing 2. Furthermore, the outer end face of the elastic member 13 contacts the outer housing 2 via a gasket. In this contact state, the elastic member 13 is sandwiched between the inner housing 3 and the outer housing 2. Similar to the elastic member 11, the elastic member 13 is formed of a polyurethane-based resin with an ultra-microfoamed structure.

[0109] This describes the elastic connection structure between the switch retainer 20 and the rear end 38.

[0110] like Figure 3 As shown, the switch retainer 20 is configured as a generally rectangular box. Recesses 203 are provided on the left and right walls of the switch retainer 20, respectively, that are recessed inward (towards the center in the left-right direction). An elastic member 15 is embedded in the recess 203. Similar to the elastic member 11, the elastic member 15 is formed of a polyurethane-based resin with an ultra-micro-foamed structure. The elastic member 15 has a through-hole extending through it in the left-right direction. On the other hand, a pair of arms 385 protrude forward from the left and right walls of the rear end 38 (controller housing 382) of the inner housing 3. A protrusion 386 protruding inward (towards the center in the left-right direction) is provided at the top of each arm 385. The top of the arm 385 contacts the outer surface of the elastic member 15. The protrusion 386 is embedded in the through-hole of the elastic member 15 and is covered by the elastic member 15 around its circumference. The top of the protrusion 386 is separated from the bottom of the recess 203.

[0111] According to the structure described above, the inner shell 3 and the outer shell 2 can move relative to each other in all directions, including the vertical, horizontal, and front-back directions, via elastic members 11, 13, and 15. That is, the inner shell 3 and the outer shell 2 are elastically connected in a manner that can accommodate vibrations in any direction.

[0112] Since the front end 30 houses the motor 41, spindle 5, and transmission mechanism 45, the front end 30 of the inner housing 3 may experience the greatest vibration when the top tool 91 is driven to swing. More specifically, vibrations are generated on the output shaft 415 and the spindle 5 as the rotation is driven. In contrast, in this embodiment, the elastic member 11 sandwiched between the inner housing 3 and the outer housing 2 is positioned in the front-rear direction between the drive axis A1 of the spindle 5 and the rotation axis A2 of the output shaft 415. With this configuration, the elastic member 11 can effectively suppress the transmission of vibration to the outer housing 2 by coping with both the vibration generated by the spindle 5 and the vibration generated by the output shaft 415. In addition, the elastic member 11 is positioned in the vertical direction below the third housing portion 33 of the swing arm 458 for housing the transmission mechanism 45, and is located relatively close to the swing surface P. Therefore, when the top tool 91 is driven to swing, the swaying of the inner housing 3 within the outer housing 2 can be suppressed.

[0113] In addition, in this embodiment, two elastic members 11 are arranged in the left-right direction, thereby achieving a more durable elastic connection structure compared to the case where only one elastic member 11 is provided.

[0114] Furthermore, in this embodiment, in addition to the elastic member 11, the front end portion 30 is elastically connected to the outer housing 2 via the elastic member 13 externally mounted on the rotation shaft 78. Additionally, besides the front end portion 30, the rear end portion 38 is also elastically connected to the switch holding member 20, which is part of the outer housing 2, via the elastic member 15. Therefore, the transmission of vibration to the outer housing 2 can be more effectively suppressed.

[0115] Furthermore, by configuring the elastic member 13 as described above, the rotating shaft 78 can be stably held by the inner housing 3 (cover 311) by the elastic member 13 before assembling the outer housing 2. Then, the upper housing 27 and lower housing 28 of the outer housing 2 clamp the two ends of the rotating shaft 78 from above and below, and connect the upper housing 27 and lower housing 28 by screws, thereby holding the rotating shaft 78 to the outer housing 2. In this way, the elastic member 13 also facilitates assembly. Furthermore, since two elastic members 13 are arranged at the left and right ends of the rotating shaft 78, the rotating shaft 78 can be held in a balanced and good manner. Moreover, assembly is also easy, as the cylindrical elastic member 13 can simply be fitted onto the rotating shaft 78.

[0116] Furthermore, as described above, the switch 29 for starting the motor 41 is held to the rear end 23 of the outer housing 2 by the switch retainer 20. Therefore, the switching member 293, which is connected to the working part 291 of the switch 29 and switches the switch 29 between the on and off states, is also held to the outer housing 2. The switching member 293 and its holding structure will be described below.

[0117] like Figure 2 and Figure 4 As shown, the switching member 293 is an elongated member extending linearly along the front-rear direction. An operating portion 294 is integrally formed at the front end of the switching member 293. The rear end of the switching member 293 is connected to the working portion 291 of the switch 29. The switching member 293 is configured to move along the front-rear direction in response to a sliding operation performed by the user on the operating portion 294, thereby moving the working portion 291 between an on position and an off position (i.e., switching the switch 29 between an on state and an off state). In this embodiment, the switching member 293 is held by a holding member 26 supported on the outer housing 2, allowing it to move relative to the outer housing 2 in the front-rear direction.

[0118] like Figure 2 , Figure 4 , Figure 13 and Figure 14 As shown, the retaining member 26 is supported by the lower housing 28 of the outer housing 2 and the switch retaining member 20. Furthermore, the retaining member 26 is configured to hold the switching member 293 so that it can slide in the front-back direction. In this embodiment, the retaining member 26 includes a sliding guide 261 and a plurality of support legs 263.

[0119] The sliding guide portion 261 is elongated in the front-rear direction and has a shape that substantially corresponds to that of the switching member 293. A recess is formed on the upper surface of the sliding guide portion 261. The switching member 293 is slidably disposed within this recess in the front-rear direction. Multiple support legs 263 protrude from the left and right sides of the front end of the sliding guide portion 261. Figure 13 As shown, each support leg 263 extends downward in a curved shape. On the other hand, multiple protrusions 283 are provided on the left and right sides of the portion constituting the front end 21 of the lower housing 28. The protrusions 283 protrude upwards from the upper end of the lower housing 28. The protrusions 283 are positioned corresponding to the support legs 263, thereby bearing the lower end of the support legs 263. Furthermore, the rear end 262 of the retaining member 26 is mounted on and locked by the switch retaining member 20, which is elastically connected to the rear end 38 of the inner housing 3.

[0120] like Figure 14 As shown, each support leg 263 has a semi-circular recess when viewed from above. On the inner side of the lower housing 28, cylindrical portions 285 are provided at four locations facing the recesses of each support leg 263. Furthermore, the upper end of the cylindrical portion 285 is located below the upper end of the lower housing 28. On the other hand, as... Figure 3 and Figure 11As shown, cylindrical portions 271 with internal threads formed on their inner circumference are provided at four corresponding locations on the upper housing 27. The cylindrical portions 271 protrude downwards from the lower end of the upper housing 27. During the assembly process of the vibrating tool 1, after the inner housing 3 and the retaining member 26 are housed in the lower housing 28, the upper housing 27 is connected to the lower housing 28. At this time, the cylindrical portions 271 of the upper housing 27 are inserted into the recesses of the support legs 263 and into the cylindrical portions 285 of the lower housing 28, thereby properly positioning the retaining member 26 against the outer housing 2. Then, a screw is inserted from the lower side of the cylindrical portion 285 and screwed into the cylindrical portion 271, thereby fixing the lower housing 28 to the upper housing 27.

[0121] Although detailed illustrations are omitted, when the upper housing 27 is connected to the lower housing 28, each support leg 263 is positioned within the outer housing 2 along the inner surface of the upper housing 27, separated from the inner housing 3. Additionally, as... Figure 12 As shown, the sliding guide 261 is disposed in the outer housing 2 along the lower surface of the upper wall of the upper housing 27 in a state separated from the inner housing 3.

[0122] Moreover, such as Figure 13 and Figure 14 As shown, in this embodiment, in addition to the switching member 293, the holding member 26 also holds the lighting device 260 for illuminating the working area of ​​the tip tool 91. Therefore, the holding member 26 has a lighting device holding portion 265 protruding forward from the sliding guide portion 261. The lighting device holding portion 265 includes an extension portion 266 and a pair of arms 268. The extension portion 266 extends linearly forward from the center in the left-right direction of the front end of the sliding guide portion 261 to the front of the rotation shaft 78. The pair of arms 268 extend downward from the front end of the extension portion 266 in a split-branch shape, holding the portion of the lighting device 260. Furthermore, the holding member 26 is configured to guide the wire 269 for supplying power from the controller 383 to the lighting device 260. The wire 269 is held in a groove formed on the upper surface of the holding member 26. The groove extends from the rear end 262 along the lighting device holding portion 265.

[0123] In addition, such as Figure 8As shown, a rectangular groove 267 extending in the front-rear direction is formed on the lower surface of the extension 266. The groove 267 is configured such that the long axis portion of the eccentric portion 781 of the rotating shaft 78 can be fitted into it. When the operating handle 77 is positioned in the forward position, the long axis portion of the eccentric portion 781 of the rotating shaft 78 protrudes upward and fits into the groove 267. Thus, when the tip tool 91 is clamped, the lighting device holding portion 265 is supported by the rotating shaft 78 and is disposed in the outer housing 2 in a state separate from the inner housing 3. Furthermore, in the assembly process of the vibrating tool 1, before the operator puts the inner housing 3 into the outer housing 2, the operator places the rear end 262 of the holding member 26 and the lighting device holding portion 265 on the switch holding member 20 and the rotating shaft 78 respectively, thereby stably holding them. As a result, the operation of putting the inner housing 3 and the holding member 26 into the outer housing 2 can be easily performed.

[0124] The airflow path inside the housing 10 will now be described.

[0125] As described above, in this embodiment, the housing 10 is a double-layered housing comprising an inner housing 3 and an outer housing 2. Accordingly, air for cooling the motor 41 flows into the outer housing 2 from the outside and further into the inner housing 3. After cooling the motor 41, it flows out from the inner housing 3 and further out from the outer housing 2.

[0126] In this embodiment, such as Figure 2 and Figure 3 As shown, the annular opening (gap) defined by the rear end (open end) of the rear end 23 of the outer housing 2 and the outer peripheral surface of the rear end 38 of the inner housing functions as an air inlet 801 for allowing external air to flow into the outer housing 2. On the other hand, as Figure 2 , Figure 4 and Figure 5 As shown, air inlets 803, 804, and 805 are provided at multiple different locations within the inner housing 3. Air inlets 803 are multiple through holes formed on the left and right walls of the rear end portion 38 (specifically, the controller housing 382). Air inlets 804 are openings defined by the rear end of the cylindrical extension 36. Furthermore, air inlets 805 are through holes formed on the upper and lower walls of the extension 36, extending linearly along the front-rear direction.

[0127] like Figure 4 and Figure 5 As shown, an exhaust port 807 for discharging air from the cooling motor 41 through the inner housing 3 is provided at the front end 30. More specifically, the exhaust port 807 is a plurality of through holes formed in the peripheral wall of the second housing 32 and is provided radially outward of the fan 43. Additionally, as... Figure 6As shown, the exhaust ports 809 for discharging air from the outer housing 2 are multiple through holes formed in the lower wall of the front end portion 21 (more specifically, the lower region of the motor 41). Furthermore, although detailed illustrations are omitted, the exhaust ports 809 are arranged in a left-right direction. Additionally, an opening is provided in the lower wall of the front end portion 21 to expose the lower end of the main shaft 5 to the outside, and a gap exists around the main shaft 5. Accordingly, air discharged from the inner housing 3 can also flow out to the outside of the outer housing 2 through this gap.

[0128] In addition, such as Figure 2 , Figure 3 and Figure 5 As shown, in this embodiment, a partition wall 81 is provided between the exhaust port 807 and the air inlets 803, 804, and 805 of the inner housing 3 to divide the space (gap) between the inner housing 3 and the outer housing 2. That is, the partition wall 81 divides the space between the inner housing 3 and the outer housing 2 into a space on the exhaust port 807 side and a space on the air inlets 803, 804, and 805 side. The partition wall 81 is formed in a conical shape, with its smaller diameter end joining the front end of the extension 36 in a manner that increases radially towards the front. The front edge of the partition wall 81 contacts the inner circumferential surface of the outer housing 2 and the sliding guide portion 261 of the retaining member 26. Furthermore, in this embodiment, the partition wall 81 is formed of an elastically deformable elastomer and is integrally formed with the resin housing 302 (left housing 303 and right housing 304).

[0129] The airflow path generated by the rotation of fan 43 and flowing within housing 10 is as follows. First, a portion of the air flowing into the outer housing 2 from inlet 801 flows into the rear end portion 38 from inlet 803, cooling the controller 383, and flows forward through the gap in front of the rear end portion 38. Another portion of the air flowing in from inlet 801 flows forward through the gap between the rear end portion 23 and the rear end portion 38. Furthermore, air passes around the elastic rib 371 and the switch retainer 20, with a portion flowing into the cylindrical extension 36 from inlet 804. Another portion passes through the gap between the central portion 22 and the extension 36 and flows into the extension 36 from inlet 805. In this embodiment, by providing inlets 804 and 805 on the cylindrical extension 36, the incoming air flows efficiently towards the front end portion 30 within the extension 36.

[0130] Air flowing into the front end 30 mainly enters the motor 41 through a through hole in the center of the base plate disposed on the upper side of the motor 41, and cools the motor 41 while flowing downward between the stator and rotor. Then, air that is radially outward by the fan 43 flows out from the exhaust port 807 of the second housing 32 to the outside of the inner housing 3, and then flows out from the exhaust port 809 of the outer housing 2 to the outside of the housing 10.

[0131] As described above, a partition wall 81 is provided between the exhaust port 807 and the air inlets 803, 804, and 805. Therefore, it is possible to prevent air heated by cooling the motor 41 and discharged from the exhaust port 807 from flowing back into the inner housing 3 from the outer housing 2 through the air inlets 803, 804, and 805. As a result, it is possible to suppress the decrease in the cooling efficiency of the motor 41.

[0132] In particular, the partition wall 81 is formed into a cone shape by an elastic body. Therefore, due to the pressure difference generated between the space on the front side and the space on the rear side of the partition wall 81, the partition wall 81 deforms, and its periphery is pressed against the inner peripheral surface of the outer housing 2 and the sliding guide portion 261, thus adhering tightly to them. This more reliably prevents the flow of air discharged from the exhaust port 807 into the spaces on the intake ports 803, 804, and 805. Furthermore, since the partition wall 81 is elastically deformable, the possibility of gaps forming when the inner housing 3 and the outer housing 2 move relative to each other is reduced.

[0133] Furthermore, in existing vibratory tools, there is a type where the rotation axis of the motor's output shaft (the fan's rotation axis) intersects with the drive axis of the main shaft and extends parallel to the long axis of the inner housing. In this type of vibratory tool, air flowing in from the inlet and along the long axis within the inner housing passes directly through the fan without changing direction and exits from the exhaust port. In such a flow path, air exiting from the exhaust port is unlikely to flow back to the inlet.

[0134] On the other hand, in the vibration tool 1 of this embodiment, the motor 41 is configured such that the rotation axis A2 of the output shaft 415 (i.e., the rotation axis A2 of the fan 43) is parallel to the drive axis A1 of the main shaft 5 and intersects the extending direction of the long axis of the inner housing 3. By configuring it in this way, the main shaft 5 and the motor 41 are arranged close together, thereby achieving a compact vibration tool 1. On the other hand, the airflow direction within the inner housing 3 is changed near the motor 41. Specifically, the air flowing in from the air inlets 803, 804, and 805 flows forward along the long axis of the inner housing 3 within the extension 36, changes direction at the upper part of the front end 30 (more specifically, the second receiving part 32), flows downward within the motor 41, and flows out from the exhaust port 807. In this structure, compared to the conventional type described above, since the air flowing out from the exhaust port 807 is more likely to flow towards the air inlets 803, 804, and 805, it can be said that the effect of providing the partition wall 81 is significant.

[0135] Furthermore, in this embodiment, the inner housing 3 is formed by connecting a metal housing 301 and a resin housing 302. Consequently, a gap may sometimes occur at the connection (boundary) between the metal housing 301 and the resin housing 302. Therefore, a sealing member 83 for sealing the gap between the metal housing 301 and the resin housing 302 is provided on the vibrating tool 1.

[0136] In this embodiment, although the front end of the extension 36 abuts against the second receiving portion 32, a slight gap is easily created between them. Therefore, the sealing member 83 is configured to seal the gap between the second receiving portion 32 and the extension 36. On the other hand, the cover portion 35 is fixed to the upper end of the second receiving portion 32 by screws. In addition, the left side housing 303 and the right side housing 304 of the resin housing 302 are also fixed to each other by screws. Accordingly, although a sealing member for sealing their boundaries is not provided in this embodiment, a sealing member can be provided in the same way.

[0137] Furthermore, in this embodiment, similar to the partition wall 81, the sealing member 83 is made of an elastomer. The sealing member 83 is integrally formed with the resin housing 302 (left housing 303 and right housing 304) along the front end of the extension 36. Accordingly, when the metal housing 301 is connected to the resin housing 302, the sealing member 83 is in close contact with the outer peripheral surface of the second receiving portion 32, thereby sealing the gap. As a result, it is possible to prevent air heated by the cooling motor 41 and flowing out from the exhaust port 807 from re-flowing into the inner housing 3 through the gap between the second receiving portion 32 and the extension 36. As a result, it is possible to suppress the decrease in the cooling efficiency of the motor 41. In particular, when air flows in from the gap between the second receiving portion 32 and the extension 36, it is drawn into the motor 41 from above by the fan 43, so sealing the gap is effective.

[0138] Furthermore, as described above, in this embodiment, the partition wall 81 and the sealing component 83 are integrally formed with the inner housing 3 (resin housing 302). Therefore, compared to the case where the partition wall 81 and the sealing component 83 are components independent of the inner housing 3 or the outer housing 2, assembly is easier. Additionally, the switching component 293 and the retaining component 26 of the switch 29 are held inside the outer housing 2. Therefore, by providing the partition wall 81 within the inner housing 3, assembly of the inner housing 3 and the outer housing 2 is facilitated.

[0139] Below, refer to Figure 15 and Figure 16 To illustrate the operation handle 77 and the rotating shaft 78 in the above embodiments (see reference 78) Figure 1 and Figure 8 The modified example involves the operating handle 770 and the rotating shaft 780. Furthermore, in the following description, the same reference numerals are used for structures common to the above embodiments, and their descriptions are omitted.

[0140] like Figure 15 and Figure 16 As shown, with operating handle 77 (refer to...) Figure 1 Similarly, the operating handle 770 is formed in a generally U-shape. The operating handle 770 is a single component integrally molded from synthetic resin, comprising a pair of arms 771 and a grip portion 779.

[0141] One end of each of the pair of arms 771 engages with the upper left and upper right ends of the front end portion 21 of the outer housing 2. The left and right pairs of arms 771 extend while bending along the left and right sides of the front end portion 21, respectively, and are connected to each other at the center in the left-right direction. The pair of arms 771 are flexible and can elastically deform (flex) in the direction in which the spacing between them changes (left-right direction).

[0142] The end of each arm 771 that engages with the outer housing 2 (hereinafter referred to as the engaging portion 772) includes a circular plate portion 773, a cylindrical portion 774, and an inner flange 776. The circular plate portion 773 is a circular plate-shaped portion disposed on the outer side of the outer housing 2 (specifically, the left and right side walls of the front end portion 21). The cylindrical portion 774 is a bottomed cylindrical portion closed at one end by the circular plate portion 773. A pair of cylindrical portions 774 protrude from the circular plate portions 773 toward each other. The cylindrical portions 774 are held by the upper housing 27 and the lower housing 28 and extend in the left-right direction along the axis of rotation A3. A plurality of protrusions 775 are formed inside the cylindrical portion 774. The protrusions 775 are provided at equal intervals in the circumferential direction and extend from the open end of the cylindrical portion 774 toward the circular plate portion 773 in the left-right direction. The inner flange 776 is an annular portion that protrudes radially outward from the end of the cylindrical portion 774 on the open side. The inner flange 776 is disposed on the inner side of the outer housing 2 (more specifically, the left and right sidewalls of the front end portion 21).

[0143] The grip 779 is a plate-shaped portion that protrudes from the connection portion of a pair of arms 771. The user can grip the grip 779 to rotate the operating handle 770.

[0144] With rotation axis 78 (reference) Figure 8 Similarly, the rotating shaft 780 passes through the inner housing 3 and extends in the left-right direction. An eccentric part (cam part) 781 is provided in the center of the rotating shaft 780.

[0145] The left and right ends of the rotating shaft 780 are respectively engaged with the engaging portions 772 of the left and right arms 771. More specifically, a plurality of engaging grooves 783 are formed on the outer periphery of both ends of the rotating shaft 780. The engaging grooves 783 are equally spaced along the circumference of the rotation axis A3 and extend from the ends of the rotating shaft 780 toward the center in the left-right direction. The engaging grooves 783 have a shape that matches the protrusions 775 of the engaging portions 772. When the engaging grooves 783 are engaged with the protrusions 775, both ends of the rotating shaft 780 are engaged with the engaging portions 772 of a pair of arms 771. With this structure, the rotating shaft 780 can rotate integrally with the operating handle 770 and is supported on the outer housing 2 by the operating handle 770.

[0146] With the above structure, the operator can easily assemble the operating handle 770 and the rotating shaft 780 into the housing 10 by following the steps below.

[0147] The operator first inserts the rotating shaft 780 through the through hole of the cover 311, which extends through the front end 30 of the inner housing 3 in a left-right direction. Then, the operator inserts the elastic members 13 into both ends of the rotating shaft 780. When the operator inserts the inner portion of the elastic member 13 into the recess 313 of the cover 311, the rotating shaft 780 is stably held by the inner housing 3 by the elastic member 13. Furthermore, the operator elastically deforms the left and right pairs of arms 771 in a direction away from each other, thereby increasing the spacing of the engaging portions 772, so that the engaging grooves 783 engage with the protrusions 775 and are inserted into both ends of the rotating shaft 780. The pair of arms 771 return to their original position by a restoring force. In this way, the rotating shaft 780 and the operating handle 770 are connected and can rotate as a single unit.

[0148] The operator uses the upper housing 27 and lower housing 28 of the outer housing 2 to clamp the left and right cylindrical parts 774 from above and below, and connects the upper housing 27 and lower housing 28 with screws. The operating handle 770 and the rotating shaft 780 are supported by the outer housing 2 so that they can rotate about the rotation axis A3, thereby completing the assembly.

[0149] When assembly is complete, the circular plate portion 773 and the inner flange 776 of each engaging portion 772 are respectively disposed on the outer and inner sides of the sidewall of the outer housing 2 in a manner that clamps the sidewall of the outer housing 2. Accordingly, the left-right movement of the engaging portion 772 is restricted by the outer housing 2, and the elastic deformation of the pair of arms 771 is restricted. In particular, the inner flange 776 disposed on the inner side of the outer housing 2 restricts the movement of the engaging portion 772 in the direction of the outer side of the outer housing 2, thereby effectively preventing the operating handle 770 from disengaging from the rotating shaft 780.

[0150] Furthermore, the inner flange 776 has an outer surface 777 facing the circular plate portion 773 and an inner surface 778 located on the opposite side of the circular plate portion 773. The outer surface 777 and the inner surface 778 are arranged in a position facing each other in the left-right direction in a manner that is substantially parallel to each other. The outer surface 777 and the inner surface 778 abut against the inner surface of the side wall of the outer housing 2 and one end face of the cylindrical elastic member 13, respectively. With this configuration, the outer housing 2 and the elastic member 13 can be efficiently connected through the inner flange 776 for preventing the operating handle 770 from disengaging.

[0151] The following shows the correspondence between the structural elements of the above embodiments and the structural elements of the present invention. However, the structural elements of the embodiments are merely examples and are not intended to limit the structural elements of the present invention.

[0152] The vibrating tool 1 is an example of a "power tool". The inner housing 3 is an example of a "housing". The spindle 5 and the tool mounting part 51 are examples of a "spindle" and a "tool mounting part", respectively. The drive shaft A1 is an example of a "drive shaft". The clamping shaft 61 is an example of a "clamping shaft". The clamping spring 65 is an example of a "first force-applying member". The clamping member 71 is an example of a "locking member". The collar 75 is an example of a "first retaining member". The operating handle 77 is an example of an "operating member". The pressing sleeve 671 is an example of a "pressing member". The inclined surface 513 and the inclined surface 913 are examples of a "first inclined surface" and a "second inclined surface", respectively. The retaining member 73 is an example of a "second retaining member". The groove 753 of the collar 75 is an example of a "first recess". The retaining recess 733 of the retaining member 73 is an example of a "second recess". The force-applying spring 675 is an example of a "second force-applying component". The spring support component 57 is an example of a "spring support". The elastic ring 718 is an example of a "third force-applying component".

[0153] The above embodiments are merely illustrative, and the power tools involved in this invention are not limited to the structure of the illustrated vibratory tool 1. For example, the modifications illustrated below can be implemented. Furthermore, at least one of these modifications can be combined with the vibratory tool 1 shown in the embodiments or the solutions described in the various technical solutions.

[0154] For example, the structure of the clamping mechanism 60 (e.g., the shape, arrangement, support structure of the clamping shaft 61 and clamping spring 65, the structural components, shape, arrangement, support structure, etc. of the locking mechanism 7) can be appropriately modified. Below, examples of possible modifications are shown.

[0155] For example, the clamping shaft 61 can be forced upward relative to the main shaft 5 directly by the clamping spring 65, instead of by the retainer 73 and the clamping member 71. The clamping spring 65 can be, for example, a tension coil spring, a torsion spring, a disc spring, or a rubber spring, instead of a compression coil spring.

[0156] In the above embodiment, the retainer 73 is configured to perform multiple functions (retaining the clamping member 71, bearing the force of the clamping spring 65, and pressing down the pressure sleeve 671 in response to the clamping release operation of the operating handle 77). However, the retainer 73 does not need to perform all of these functions. In addition, these functions can be implemented by multiple components.

[0157] The clamping member 71 can be directly held by the collar 75. That is, the retaining member 73 can be omitted. In this case, for example, the clamping member 71 can be held directly or indirectly in the inner housing 3 in a radially movable manner, and the collar 75 can move vertically relative to the clamping member 71 and the spindle 5. In this case, it is sufficient for the collar 75 to press down on the pressing sleeve 671 during its downward movement. In addition, the collar 75 and the clamping member 71 are configured such that when the collar 75 moves downward in response to the clamping release operation of the operating handle 77, the clamping member 71 moves relative to the locking position from the unlocking position.

[0158] In the above embodiment, the number of clamping members 71 is two, but it can also be three or more. Furthermore, the engaging member that engages with the clamping shaft 61 and remains in the clamped position is not limited to the clamping member 71. For example, ball bearings can also be used. In this case, it is sufficient to replace the groove 612 with an annular groove with a semi-circular cross-section corresponding to the ball bearing at the upper end of the clamping shaft 61. Moreover, the number of ball bearings can be one or more. Along with such changes to the clamping member 71, the structure of the collar 75 can also be appropriately modified. Additionally, the locking mechanism 7 can be disposed, for example, inside the spindle 5, instead of on the upper side of the spindle 5.

[0159] The shape, configuration, and support structure of the pressure sleeve 671 can be modified, as long as it can press down on the tip tool 91 by pressing down on either the retaining member 73 (or clamping member 71) or the collar 75 in response to the clamping release operation of the operating handle 77. For example, the shape of the large diameter portion 673 can be appropriately modified. However, in order to more reliably eliminate the tightening of the tip tool 91, it is preferable that the large diameter portion 673 contacts the tip tool 91 at multiple locations around the clamping shaft 61. Alternatively, it is preferable that the large diameter portion 673 contacts the tip tool 91 in a manner that surrounds the clamping shaft 61 circumferentially. Alternatively, it is preferable that the large diameter portion 673 contacts the tip tool 91 in a surface contact manner as described in the above embodiment. In addition, at least one rod-shaped pressure member can be provided instead of the cylindrical pressure sleeve 671. In the above embodiment, the retainer 73 abuts against the pressing sleeve 671 to press down the pressing sleeve 671, but the retainer 73 can also press down the pressing sleeve 671 through another component. Alternatively, the pressing sleeve 671 can also be connected to the lower end of the retainer 73 and move integrally with the retainer 73 in the vertical direction.

[0160] The force-applying spring 675 of the pressure sleeve 671 may not be a compression coil spring, but may be, for example, a tension coil spring, a torsion spring, a disc spring, or a rubber spring. Furthermore, the configuration of the force-applying spring 675 is not limited to the examples described above.

[0161] The elastic ring 718 used to temporarily hold the clamping shaft 61 when the clamping member 71 is in the unlocked position may not be rubber, but other elastomers (e.g., an elastic ring made of metal), or it may be omitted.

[0162] The shape, arrangement, and support structure of the operating handle 77 and the rotating shaft 78 can be changed, as long as one of the clamping member 71 and the collar 75 (or its variations) can be moved downwards in response to external operation by the user. For example, the operating handle 77 can be rotatable about a rotation axis extending in the front-back or up-down direction. The rotating shaft 78 can be changed in response to changes in the operating handle 77. In addition, the rotating shaft 78 (eccentric portion 781) can press down on the retainer 73 through other components, rather than directly abutting against the retainer 73.

[0163] The structure of the spindle 5 (e.g., shape, support structure, etc.) is not limited to the examples of the above embodiments and can be appropriately modified. For example, in the above embodiments, the tool mounting portion 51 has a recess 351 corresponding to the tip tool 91 with a protrusion 911. Moreover, the tip tool 91 is fixed to the tool mounting portion 51 with the inclined surface 913 abutting against the inclined surface 513 of the tool mounting portion 51. However, the tool mounting portion 51 can also be configured to have a planar lower surface, which can fix the tip tool with a planar upper surface. In addition, in this case, in order to position the tip tool in the tool mounting portion 51, a protrusion and a fitting hole can be provided on the tool mounting portion 51 and the tip tool 91, respectively. In this case, similar to the inclined surface 513 and inclined surface 913 in the above embodiments, inclined surfaces that are inclined relative to the drive axis A1 and match each other can be provided on the protrusion and the fitting hole.

[0164] The structure (e.g., shape, internal structure for storage, configuration, etc.) of the housing 10, motor 41, and transmission mechanism 45 can also be appropriately modified. For example, the elastic members 11, 13, and 15 sandwiched between the inner housing 3 and the outer housing 2 can also be formed of materials different from those in the above embodiments (e.g., rubber, foams of other types of synthetic resins). The shape, number, and arrangement of the elastic members 11, 13, and 15 can also be different. In addition, the housing 10 does not need to be a vibration-damping housing including an elastically connected outer housing 2 and an inner housing 3; it can also be a single-layer structure housing. Furthermore, the structural components and connection methods of the inner housing 3 and the outer housing 2 can also be appropriately modified. The airflow path within the housing 10 can also be different from that in the above embodiments. In addition, for example, the motor 41 can be an AC motor. The motor 41 can also be stored in the holding portion (central portion 22) of the housing 10 in such a way that the rotation axis A2 of the output shaft 415 is orthogonal to the drive axis A1.

[0165] Furthermore, in view of the spirit of the present invention and the above-described embodiments and their variations, the following embodiments 1 to 3 are constructed. The following embodiments 1 to 3 can be used independently or in combination with the vibration tool 1 shown in the embodiments, the above-described variations, or the solutions described in each technical solution.

[0166] [Method 1]

[0167] The operating component is configured to move the engaging component downward relative to the first retaining component in response to the release operation.

[0168] The second position of the engaging component is located below the first position.

[0169] [Method 2]

[0170] The sleeve is inserted into the main shaft.

[0171] The second retaining member is configured to press down on the sleeve by abutting against the upper end of the sleeve on the upper side of the spindle during downward movement.

[0172] [Method 3]

[0173] One of the clamping shaft and the engaging member has a recess, and the other of the clamping shaft and the engaging member has a protrusion, the protrusion being able to engage with the recess when the engaging member is configured in the first position.

[0174] The groove 612 and the protrusion 717 are examples of the "recess" and "protrusion" of this method, respectively.

[0175] Furthermore, with the aim of providing a technique that helps suppress the decrease in cooling efficiency of the motor in a power tool having an inner housing and an outer housing, the following methods 4 to 21 are constructed. Any one of the following methods 4 to 21 may be used alone, or in combination of two or more. Alternatively, at least one of the following methods 4 to 21 may be used in combination with at least one of the vibration tool 1 of the embodiment, the above-described modifications, methods, and solutions described in each technical solution.

[0176] [Method 4]

[0177] A power tool that drives a tip tool to oscillate to perform machining operations on a workpiece, characterized in that...

[0178] It has a motor, a spindle, an inner housing, an outer housing, and partition walls, among which,

[0179] The spindle is configured to be supported so as to be rotatable about a drive axis, and to be driven by the power of the motor to swing the top tool which is detachably mounted.

[0180] The inner housing houses the motor and the main shaft, and has at least one air inlet and at least one exhaust outlet;

[0181] The outer housing houses the inner housing and is elastically connected to the inner housing in a relatively movable manner;

[0182] The partition wall is located between the at least one exhaust port and the at least one air inlet, dividing the space between the inner shell and the outer shell.

[0183] In this type of power tool, a space (gap) exists between an inner housing and an outer housing that are elastically connected and movably connected relative to each other. Air flowing into the inner housing through at least one air inlet, after cooling the motor, flows out into this space through at least one exhaust port. Conversely, a partition wall disposed between the at least one exhaust port and the at least one air inlet prevents air flowing out of the at least one exhaust port from flowing into the space on the air inlet side. This prevents air heated by cooling the motor from re-flowing into the inner housing through the at least one air inlet. Therefore, a decrease in the cooling efficiency of the motor can be suppressed.

[0184] [Method 5]

[0185] The power tool according to method 4 is characterized in that...

[0186] The partition wall is disposed in the inner shell.

[0187] According to this method, even if there are components assembled inside the outer housing, the operator can easily assemble the inner and outer housings.

[0188] [Method 6]

[0189] The power tool according to method 5 is characterized in that,

[0190] The partition wall is integrally formed with the inner shell.

[0191] This method makes assembly easier.

[0192] [Method 7]

[0193] The power tool according to any one of methods 4 to 6 is characterized in that...

[0194] The partition wall is an elastic body and is configured to deform under pressure.

[0195] According to this method, the partition wall deforms due to the pressure difference between the space on the inlet side and the space on the exhaust side of the partition wall, thereby improving the tightness of the fit with the inner and outer shells. This more reliably prevents airflow from at least one exhaust port from reaching the space on the inlet side.

[0196] [Method 8]

[0197] The power tool according to any one of methods 4 to 7 is characterized in that...

[0198] The inner shell is a shell formed by connecting multiple components.

[0199] The power tool also has a sealing component for sealing at least a portion of the gap between the plurality of components.

[0200] According to this method, it is possible to prevent air heated by the cooling motor and flowing out from at least one exhaust port from re-flowing into the inner housing through the gaps between the multiple components forming the inner housing.

[0201] [Method 9]

[0202] The power tool according to method 8 is characterized in that,

[0203] Both the partition wall and the sealing component are integrally formed with either the inner shell or the outer shell.

[0204] [Method 10]

[0205] The power tool according to method 9 is characterized in that,

[0206] Both the partition wall and the sealing component are integrally formed with the inner shell.

[0207] This method makes assembly easier.

[0208] [Method 11]

[0209] The power tool according to any one of methods 4 to 10 is characterized in that,

[0210] The inner housing includes a first end portion and a cylindrical portion, the first end portion at least housing the main shaft; the cylindrical portion extends along the long axis of the outer housing, one end of which is connected to the first end portion.

[0211] The at least one exhaust port is provided at the first end.

[0212] The at least one air inlet includes at least one of the opening disposed at the other end of the cylindrical portion and the opening disposed on the peripheral wall portion of the defined cylindrical portion.

[0213] According to this method, a flow path is defined within the elongated cylindrical portion to effectively flow toward the first end along the long axis.

[0214] [Method 12]

[0215] The power tool according to any one of methods 4 to 11 is characterized in that,

[0216] The motor has an output shaft.

[0217] The spindle and the motor are configured such that the drive axis extends parallel to the rotation axis of the output shaft.

[0218] According to this method, the spindle and motor can be positioned close to each other, thereby enabling the creation of compact power tools.

[0219] [Method 13]

[0220] The power tool also has a fan configured to rotate integrally with the output shaft.

[0221] [Method 14]

[0222] The partition wall is configured such that the distance from the partition wall to the at least one exhaust port is less than the distance from the partition wall to the at least one air inlet.

[0223] [Method 15]

[0224] The outer casing has at least one air inlet and at least one exhaust outlet.

[0225] The partition wall divides the space between the at least one air inlet and the at least one exhaust port of the outer housing.

[0226] [Method 16]

[0227] The partition wall divides the space between the inner housing and the outer housing into an intake-side space on the side of at least one air inlet and an exhaust-side space on the side of at least one exhaust outlet, and the sealing member is disposed in the portion of the inner housing that is located in the exhaust-side space.

[0228] [Method 17]

[0229] It also includes a fan configured to rotate integrally with the output shaft.

[0230] The internal housing includes a motor housing section for housing the motor and the fan.

[0231] The sealing component is configured to seal the gap between the motor housing and the component connected to the motor housing.

[0232] [Method 18]

[0233] The sealing component is an elastomer.

[0234] [Method 19]

[0235] The inner housing is an elongated component with a long axis intersecting the drive axis, including a first end, a second end, and a connecting portion. The first end at least houses the main shaft. The second end is located on the opposite side of the first end in the long axis direction of the inner housing. The connecting portion connects the first end and the second end and extends along the long axis direction.

[0236] The partition wall is provided at the connecting part.

[0237] The at least one exhaust port is provided at the first end.

[0238] The at least one air inlet is provided at least one of the second end and the connecting portion.

[0239] [Method 20]

[0240] The motor is housed at the first end.

[0241] [Method 21]

[0242] The connecting portion includes a cylindrical portion and a plurality of connecting components. One end of the cylindrical portion is connected to the first end and extends toward the second end, while the other end is open. The connecting components elastically connect the other end of the extension portion to the second end.

[0243] The at least one air inlet includes at least one of the following: an opening formed at the second end, the opening of the cylindrical portion, and an opening formed on the peripheral wall of the defined cylindrical portion.

[0244] The following shows the correspondence between the structural elements of the above embodiments and the structural elements of methods 4 to 21. However, the structural elements of the embodiments are merely examples and are not intended to limit the structural elements of the present invention.

[0245] Vibrating tool 1 is an example of a "power tool". Motor 41 is an example of a "motor". Spindle 5 is an example of a "spindle". Drive axis A1 is an example of a "drive axis". Inner housing 3 is an example of an "inner housing". Air inlets 803, 804, and 805 are examples of "air inlets". Exhaust port 807 is an example of an "exhaust port". Outer housing 2 is an example of an "outer housing". Partition wall 81 is an example of a "partition wall". Metal housing 301 and resin housing 302 are examples of "multiple components". Sealing component 83 is an example of a "sealing component". Front end portion 30 of inner housing 3 is an example of a "first end". Extension 36 is an example of a "cylindrical portion". Output shaft 415 is an example of an "output shaft". Rotation axis A2 is an example of a "rotation axis of the output shaft". Fan 43 is an example of a "fan". Air inlet 801 and exhaust outlet 809 are examples of "air inlet" and "exhaust outlet," respectively. Second housing section 32 is an example of "motor housing section." Front end section 30 and rear end section 38 are examples of "first end section" and "second end section," respectively. Elastic rib 371 is an example of "connecting member."

[0246] Furthermore, the power tools described in each of the methods 4 to 21 are not limited to the vibratory tool 1 exemplified by the above embodiments. For example, the modifications exemplified below can be implemented. In addition, at least one of these modifications can be combined with at least one of the vibratory tool 1 of the embodiments, the above-described modifications, methods, and solutions described in each technical solution.

[0247] For example, the structure (shape, structural components, connection method, etc.) of the housing 10 (inner housing 3 and outer housing 2) can be appropriately modified. For example, the metal housing 301 and resin housing 302 of the inner housing 3 can each have different shapes. The resin housing 302 can be formed by connecting the upper housing and the lower housing. The outer housing 2 can be formed by connecting the left housing and the right housing. The inner housing 3 can be formed only by the front end 30 (metal housing 301) for housing the main shaft, etc. In addition, the front end 30 and the rear end 38 can be connected only by the extension 36, or they can be connected by a single elastic body having a lower elastic modulus than the extension 36, instead of multiple elastic ribs 371.

[0248] The airflow path within the housing 10 may differ from the examples described in the above embodiments. Specifically, the shape, number, and arrangement of the air inlets 801, 803, 804, 805 and the exhaust ports 807, 809 may be appropriately modified based on changes to the housing 10 and the internal structure, or may be appropriately modified regardless of these changes.

[0249] For example, the air inlet 801 can be a through hole formed in the rear end portion 23. If the controller 383 is disposed, for example, within the extension 36 and not in the rear end portion 38, the air inlet 803 can be omitted. The air inlet 805 can be formed only in one of the upper and lower walls, or in both the right and left walls. Alternatively, the air inlet 805 can also be omitted. Since the fan 43 is a centrifugal fan, it is preferable that the exhaust port 807 is disposed radially outward of the fan 43, but it can also be disposed in other locations. Furthermore, if an axial fan is used as the fan 43, the exhaust port 807 can be provided, for example, in the lower wall of the second receiving portion 32.

[0250] The material, shape, and placement of the partition wall 81 can be appropriately modified. For example, the partition wall 81 can be formed from an elastomer other than a rubber-like elastomer (e.g., a foamed synthetic resin). The partition wall 81 can be a simple ring shape instead of a cone shape. The partition wall 81 can be integrally formed with the outer housing 2, or it can be formed as a component independent of the inner housing 3 and the outer housing 2. In addition, although the partition wall 81 can be positioned anywhere between the air inlets 803, 804, 805 and the exhaust outlet 807 of the inner housing 3, it is preferable to position it as close as possible to the exhaust outlet 807. Furthermore, although the partition wall 81 does not need to completely divide the space on the side of the air inlets 803, 804, 805 and the space on the side of the exhaust outlet 807 (effectively prohibiting airflow), it is preferable to minimize the gap between the partition wall 81 and the inner housing 3 and the outer housing 2.

[0251] The material, shape, and placement of the sealing component 83 can be appropriately modified. For example, the sealing component 83 can be formed of an elastomer other than a rubber-like elastomer (e.g., a foam of synthetic resin). The sealing component 83 can be formed as a component independent of the inner housing 3, configured to cover the gap, or it can be embedded in the gap.

[0252] The structure of the clamping mechanism 60 (e.g., the shape, arrangement, support structure of the clamping shaft 61 and clamping spring 65, the structural components, shape, arrangement, support structure, etc. of the locking mechanism 7) can be appropriately modified. For example, a mechanism configured to hold the clamping shaft 61 in the clamping position using ball bearings can be used instead of the clamping component 71. The structures of the operating handle 77 and the rotating shaft 78 can also be changed according to the modification of the clamping mechanism 60. Alternatively, the clamping mechanism 60 can be omitted, and the clamping shaft 61 can be fixed to the spindle 5 with screws.

[0253] The structure of the pressing mechanism 67 (e.g., the shape, configuration, support structure, and type of the force-applying spring 675 of the pressing sleeve 671) can be appropriately modified. Alternatively, the pressing mechanism 67 can be omitted.

[0254] The structure (e.g., shape, support structure, etc.) of the spindle 5, motor 41, and transmission mechanism 45 is not limited to the examples of the above embodiments and can be appropriately modified. For example, in the above embodiment, the tool mounting portion 51 has a recess 351 corresponding to the tip tool 91 with a protrusion 911. Moreover, the tip tool 91 is fixed to the tool mounting portion 51 with its inclined surface 913 abutting against the inclined surface 513 of the tool mounting portion 51. However, the tool mounting portion 51 may also be configured to have a planar lower surface, which can fix the tip tool having a planar upper surface. In addition, the motor 41 may also be an AC motor. The motor 41 may also be housed in the holding portion (central portion 22) of the housing 10 in such a way that the rotation axis A2 of the output shaft 415 is orthogonal to the drive axis A1.

[0255] Furthermore, with the aim of providing a reasonable configuration of the elastic component in a power tool having an inner housing and an outer housing, the following methods 22 to 37 are constructed. Any one of the following methods 22 to 37 may be used alone, or in combination of two or more. Alternatively, at least one of the following methods 22 to 37 may be combined with at least one of the vibration tool 1 of the embodiment, the above-described modifications, methods, and solutions described in each technical solution.

[0256] [Method 22]

[0257] A power tool that drives a tip tool to oscillate to perform machining operations on a workpiece, characterized in that...

[0258] It comprises a main shaft, a motor, a swinging component, an inner housing, an outer housing, and at least one first elastic component, wherein,

[0259] The spindle is configured to be supported so as to be rotatable about a first axis that defines the vertical direction of the power tool, and to drive the top tool, which is detachably mounted at its lower end, to swing on a swing surface.

[0260] The motor has an output shaft that can rotate about a second axis parallel to the first axis.

[0261] The oscillating component is configured to be connected to the main shaft and oscillate around the first axis as the output shaft rotates, thereby causing the main shaft to reciprocate around the first axis.

[0262] The inner housing houses the main shaft, the motor, and the swing component;

[0263] The outer housing is an elongated hollow body with a long axis, and houses the inner housing, wherein the long axis is orthogonal to the first axis and the second axis, and defines the front-rear direction of the power tool;

[0264] The at least one first elastic member is sandwiched between the inner housing and the outer housing.

[0265] The at least one first elastic member is disposed in the vertical direction between the upper end of the swing member and the swing surface, and in the front-back direction between the first axis and the second axis.

[0266] In this type of power tool, vibrations are generated on the output shaft and spindle of the motor due to rotational drive. In contrast, at least one elastic member, sandwiched between the inner and outer housings, is positioned in the longitudinal direction between the first axis of the spindle and the second axis of the output shaft, thereby effectively suppressing the transmission of vibrations to the outer housing. Furthermore, at least one elastic member is positioned in the vertical direction between the upper end of the oscillating member and the oscillating surface, and is located relatively close to the oscillating surface. Therefore, when the tool tip is driven to oscillate, the shaking of the inner housing within the outer housing can be suppressed. Thus, according to this method, a reasonable configuration of at least one elastic member can be achieved.

[0267] [Method 23]

[0268] The power tool according to method 22 is characterized in that,

[0269] The at least one first elastic member is disposed on the lower side of the inner housing.

[0270] According to this method, at least one elastic component can be positioned close to the swing surface.

[0271] [Method 24]

[0272] The power tool according to method 22 or 23 is characterized in that,

[0273] The at least one first elastic member is formed as a cylinder having an outer peripheral surface and an inner peripheral surface.

[0274] One of the inner shell and the outer shell abuts against the outer peripheral surface, and the other of the inner shell and the outer shell abuts against the inner peripheral surface.

[0275] According to this method, the inner shell and the outer shell can be elastically connected in a manner that allows relative movement in multiple directions through a simple first elastic member.

[0276] [Method 25]

[0277] The power tool according to any one of methods 22 to 24 is characterized in that,

[0278] The at least one first elastic component includes a plurality of first elastic components arranged along a left-right direction orthogonal to the up-down direction and the front-back direction.

[0279] According to this method, compared with the case of setting one first elastic component, a more durable elastic connection structure can be achieved.

[0280] [Method 26]

[0281] The power tool according to any one of methods 22 to 25 is characterized in that,

[0282] The at least one first elastic member is configured to allow the inner housing and the outer housing to move relative to each other along the vertical direction, the front-back direction, and the left-right direction orthogonal to the vertical direction and the front-back direction.

[0283] According to this method, a vibration tool capable of handling vibrations in three directions can be realized.

[0284] [Method 27]

[0285] The power tool according to any one of methods 2 to 26 is characterized in that,

[0286] It also includes a clamping shaft, an operating component, and at least one second elastic component, wherein,

[0287] The clamping shaft is configured to be coaxial with the main shaft and to clamp the top tool together with the lower end of the main shaft;

[0288] The operating component is used to release the clamping of the tip tool and has a support shaft that is rotatably supported on the outer housing.

[0289] The at least one second elastic member is sandwiched between the inner housing and the support shaft.

[0290] The at least one second elastic member is configured around the support axis.

[0291] According to this method, in addition to at least one first elastic member, at least one second elastic member can also be used to effectively suppress the transmission of vibration to the outer shell.

[0292] [Method 28]

[0293] The power tool according to method 27 is characterized in that,

[0294] The at least one second elastic member includes a plurality of second elastic members disposed on the left and right sides of the first axis in a left-right direction orthogonal to the vertical and horizontal directions and the front-back direction, respectively.

[0295] The plurality of second elastic components are each formed in a cylindrical shape and are externally mounted on the support shaft.

[0296] According to this method, the support shaft can be well balanced and maintained through an easily assembled structure.

[0297] [Method 29]

[0298] The power tool according to method 27 or 28 is characterized in that,

[0299] The at least one second elastic member is configured to allow the inner housing and the support shaft to move relative to each other along the vertical direction, the front-back direction, and the left-right direction orthogonal to the vertical and front-back directions.

[0300] This method can further improve vibration resistance.

[0301] [Method 30]

[0302] The power tool according to any one of methods 27 to 29 is characterized in that,

[0303] The operating component has a pair of arms, which are respectively connected to the two ends of the support shaft in the axial direction.

[0304] The pair of arms each has a locking portion, which directly engages with the two ends of the support shaft.

[0305] According to this method, it is possible to achieve operation components that can be easily assembled while reducing the number of parts.

[0306] [Method 31]

[0307] The power tool according to method 30 is characterized in that...

[0308] The pair of arms are connected to each other to form a single component, and are configured to change their spacing through elastic deformation.

[0309] The elastic deformation of the pair of arms is limited by the engagement portion of each arm engaging with the outer housing.

[0310] According to this method, the assembler can easily engage the locking parts at both ends of the support shaft by elastically deforming the pair of arms in a direction away from each other. Furthermore, the engagement of the locking parts with the outer housing effectively prevents the pair of arms from detaching from the support shaft.

[0311] [Method 32]

[0312] The power tool according to method 31 is characterized in that,

[0313] The engaging portion includes an abutment portion located inside the outer housing and radially outward of the support shaft. This abutment portion includes a first abutment surface and a second abutment surface. The first abutment surface abuts against the outer housing; the second abutment surface abuts against the at least one second elastic member.

[0314] The first abutment surface and the second abutment surface are positioned facing each other axially on the support shaft.

[0315] According to this method, the outer shell and at least one second elastic member can be efficiently connected by the abutment portion.

[0316] [Method 33]

[0317] The outer housing includes a grip portion configured to be gripped by a user.

[0318] [Method 34]

[0319] The spindle, the motor, and the transmission mechanism are disposed within the front end of the outer housing.

[0320] [Method 35]

[0321] The inner shell extends along the front-rear direction.

[0322] The spindle, the motor, and the transmission mechanism are disposed within the front end of the inner housing.

[0323] [Method 36]

[0324] The front end of the inner housing includes a first receiving portion, a second receiving portion, and a third receiving portion. The first receiving portion receives the main shaft. The second receiving portion is located behind the first receiving portion and receives the motor. The third receiving portion is located behind the first receiving portion and below the second receiving portion.

[0325] The at least one first elastic member is sandwiched between the third receiving part and the front end of the outer housing.

[0326] [Method 37]

[0327] The power tool also has at least one third elastic member sandwiched between the rear end of the inner housing and the outer housing.

[0328] The correspondence between the structural elements of the above embodiments and the structural elements of methods 22 to 37 is shown below. However, the structural elements of the embodiments are merely examples and are not intended to limit the structural elements of the present invention.

[0329] Vibrating tool 1 is an example of a "power tool". Spindle 5 is an example of a "spindle". Drive axis A1 is an example of a "first axis". Tool mounting part 51 is an example of a "lower end of the spindle". Swing surface P is an example of a "swing surface". Motor 41 and output shaft 415 are examples of a "motor" and an "output shaft", respectively. Rotation axis A2 is an example of a "second axis". Swing arm 458 is an example of a "swing component". Inner housing 3 is an example of an "inner housing". Outer housing 2 is an example of an "outer housing". Elastic component 11 is an example of a "first elastic component". Clamping shaft 61 is an example of a "clamping shaft". Operating handle 77 and rotating shaft 78 as a whole are an example of an "operating component". Operating handle 770 and rotating shaft 780 as a whole are another example of an "operating component". Rotating shafts 78 and 780 are examples of "support shafts". Elastic component 13 is an example of a "second elastic component". The pair of arms 771 is an example of a "pair of arms". The engaging part 772 is an example of an "engaging part". The inner flange 776 is an example of an "abutting part". The outer surface 777 and the inner surface 778 are examples of "first abutting surface" and "second abutting surface", respectively. The central part 22 is an example of a "holding part". The first storage part 31, the second storage part 32, and the third storage part 33 correspond to "first storage part", "second storage part", and "third storage part", respectively. The elastic member 15 is an example of a "third elastic member".

[0330] Furthermore, the power tools described in methods 22 to 37 are not limited to the vibratory tool 1 exemplified in the above embodiments. For example, the modifications illustrated below can be implemented. In addition, at least one of these modifications can be combined with at least one of the vibratory tool 1 of the embodiments, the above-described modifications, methods, and solutions described in each technical solution.

[0331] For example, the material, shape, number, and arrangement of the elastic members 11, 13, and 15 sandwiched between the inner housing 3 and the outer housing 2 can be appropriately changed. Below, examples of possible variations are shown.

[0332] For example, the elastic components 11, 13, and 15 may also be formed of materials different from those in the examples described above (e.g., rubber, foams of other types of synthetic resins).

[0333] Alternatively, for example, only one elastic member 11 may be provided, or more than three may be provided. The configuration of the elastic member 11 can also be changed, as long as it is located between the upper end of the swing arm 458 and the swing surface P in the vertical direction, and between the drive axis A1 and the rotation axis A2 in the front-back direction. For example, a pair of left and right elastic members 11 may be arranged from the left and right sides of the third receiving part 33 to the lower surface, respectively, between the third receiving part 33 and the front end 21. In this case, when the elastic member 11 is configured in an L-shape when viewed from the front or rear, it can effectively cope with vibrations in the left-right and vertical directions. Alternatively, the elastic member 11 may be constructed and configured as the elastic member 15. Multiple elastic members may be arranged around the rotation shaft 78 instead of the cylindrical elastic member 13. Only one elastic member 13 may be provided, or more than three may be provided, or it may be omitted. The same changes may be made to the elastic member 15, or it may be omitted.

[0334] Furthermore, the structural components and connection methods of the inner housing 3 and the outer housing 2 can be appropriately modified. For example, the metal housing 301 and the resin housing 302 of the inner housing 3 can each have different shapes. The resin housing 302 can also be formed by connecting the upper housing and the lower housing, and the outer housing 2 can also be formed by connecting the left housing and the right housing. The airflow path within the housing 10 can be different from the example of the above embodiment. The inner housing 3 can also be formed only by the front end portion 30 (metal housing 301) for housing the main shaft, etc. In addition, the front end portion 30 and the rear end portion 38 can be connected only by the extension portion 36, or they can be connected by a single elastic body having a lower elastic modulus than the extension portion 36, instead of multiple elastic ribs 371.

[0335] The structure of the clamping mechanism 60 (e.g., the shape, arrangement, support structure of the clamping shaft 61 and clamping spring 65, the structural components, shape, arrangement, support structure, etc. of the locking mechanism 7) can be appropriately modified. For example, a mechanism configured to hold the clamping shaft 61 in the clamping position using ball bearings can be used instead of the clamping component 71. The structure of the operating handles 77, 770 or the rotating shafts 78, 780 can also be modified according to the changes to the clamping mechanism 60, or independently of the changes to the clamping mechanism 60. Alternatively, the clamping mechanism 60 can be omitted, and the clamping shaft 61 can be fixed to the spindle 5 by screws.

[0336] The structure of the pressing mechanism 67 (e.g., the shape, configuration, support structure, and type of force-applying spring 675 of the pressing sleeve 671) can be appropriately modified. Alternatively, the pressing mechanism 67 can be omitted.

[0337] The structure (e.g., shape, support structure, etc.) of the spindle 5, motor 41, and transmission mechanism 45 is not limited to the examples of the above embodiments and can be appropriately modified. For example, in the above embodiment, the tool mounting portion 51 has a recess 351 corresponding to the tip tool 91 with a protrusion 911. Moreover, the tip tool 91 is fixed to the tool mounting portion 51 with its inclined surface 913 abutting against the inclined surface 513 of the tool mounting portion 51. However, the tool mounting portion 51 can also be configured to have a planar lower surface, which can fix the tip tool with a planar upper surface. In addition, the motor 41 can also be an AC motor. The motor 41 can also be housed in the holding portion (central portion 22) of the housing 10 in such a way that the rotation axis A2 of the output shaft 415 is orthogonal to the drive axis A1.

Claims

1. A power tool that drives a tip tool to oscillate to perform machining operations on a workpiece, characterized in that, It has a motor, a spindle, an inner housing, an outer housing, and partition walls, among which, The spindle is configured to be supported so as to be rotatable about a drive axis, and to be driven by the power of the motor to swing the top tool which is detachably mounted. The inner housing houses the motor and the main shaft, and has at least one air inlet and at least one exhaust outlet; The outer housing houses the inner housing and is elastically connected to the inner housing in a relatively movable manner; The partition wall is located between the at least one exhaust port and the at least one air inlet, and is used to divide the space between the inner shell and the outer shell into a first space on the side of the at least one exhaust port and a second space on the side of the at least one air inlet. The partition wall has a conical shape, with one end engaging the inner shell and its radial dimension increasing towards the other end. The partition wall deforms due to the pressure difference between the first space and the second space, and is configured to divide the first space and the second space by the other end being in close contact with the inner circumferential surface of the outer shell.

2. The power tool according to claim 1, characterized in that, The inner shell is a shell formed by connecting multiple components. The power tool also has a sealing component for sealing at least a portion of the gap between the plurality of components.

3. The power tool according to claim 2, characterized in that, Both the partition wall and the sealing component are integrally formed with either the inner shell or the outer shell.

4. The power tool according to claim 3, characterized in that, Both the partition wall and the sealing component are integrally formed with the inner shell.

5. The power tool according to claim 4, characterized in that, The sealing component is an elastomer.

6. The power tool according to claim 1, characterized in that, The inner housing includes a first end portion and a cylindrical portion, the first end portion at least housing the main shaft; the cylindrical portion extends along the long axis of the outer housing, one end of which is connected to the first end portion. The at least one exhaust port is provided at the first end. The at least one air inlet includes at least one of an opening located at the other end of the cylindrical portion and an opening located on the peripheral wall portion of the cylindrical portion.

7. The power tool according to claim 1, characterized in that, The motor has an output shaft. The spindle and the motor are configured such that the drive axis extends parallel to the rotation axis of the output shaft.

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