WO2020250715A1 - 電動作業機 - Google Patents

電動作業機 Download PDF

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Publication number
WO2020250715A1
WO2020250715A1 PCT/JP2020/021327 JP2020021327W WO2020250715A1 WO 2020250715 A1 WO2020250715 A1 WO 2020250715A1 JP 2020021327 W JP2020021327 W JP 2020021327W WO 2020250715 A1 WO2020250715 A1 WO 2020250715A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
main body
end portion
handle
handle housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/021327
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
智志 阿部
新悟 小杉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koki Holdings Co Ltd
Original Assignee
Koki Holdings Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koki Holdings Co Ltd filed Critical Koki Holdings Co Ltd
Priority to US17/618,299 priority Critical patent/US20220331941A1/en
Priority to CN202080043496.4A priority patent/CN113993667B/zh
Priority to DE212020000650.4U priority patent/DE212020000650U1/de
Priority to JP2021525996A priority patent/JP7355107B2/ja
Priority to EP20822128.3A priority patent/EP3984671A4/en
Publication of WO2020250715A1 publication Critical patent/WO2020250715A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/04—Handles; Handle mountings
    • B25D17/043—Handles resiliently mounted relative to the hammer housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/062—Means for driving the impulse member comprising a wobbling mechanism, swash plate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/04—Handles; Handle mountings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24—Damping the reaction force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/006—Vibration damping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/061—Swash-plate actuated impulse-driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B25D2222/57—Elastomers, e.g. rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/121—Housing details

Definitions

  • the present invention relates to an electric work machine, and particularly to a vibration-proof structure in the electric work machine.
  • Patent Document 1 describes a hammer drill which is one of the above-mentioned electric working machines.
  • the hammer drill described in Patent Document 1 has a main body portion including a housing for accommodating a motor and a transmission mechanism for transmitting a driving force output from the motor to a tip tool, and a handle portion gripped by an operator.
  • an elastic body is provided between the housing and the handle portion to prevent or suppress the vibration generated in the housing from being transmitted to the handle portion.
  • the handle portion connected to the housing accommodating the vibration source via the elastic body for preventing or suppressing the vibration transmission is sometimes referred to as the “vibration-proof handle”.
  • An object of the present invention is to realize an electric work machine in which the number of parts is reduced and the structure is simplified to reduce the assembly man-hours and the size, and vibration transmission is prevented or suppressed to the same level as or more than the conventional one. Is.
  • the electric working machine has a first member and a second member forming at least a part of an outer shell, and the first member and the second member are relative to each other via an elastic body. Connected so that it can be moved.
  • the elastic body is a part of a series of resin covers formed on the first member and the second member by two-layer molding and covering the surfaces of the first member and the second member.
  • the electric working machine has a first member and a second member forming at least a part of an outer shell, and the first member and the second member are connected and elastic. Connected through the body.
  • the connecting portion includes a first end portion connected to the first member, a second end portion connected to the second member, and an intermediate portion connecting the first end portion and the second end portion. Including.
  • the first end, the second end and the intermediate portion are integrally molded, and the intermediate portion is more fragile than the first end portion and the second end portion.
  • the elastic body is formed on the first member and the second member by two-layer molding, and is one of a series of resin covers that straddle the connection portion and cover the surfaces of the first member and the second member. It is a department.
  • the number of parts is reduced and the structure is simplified to reduce the assembly man-hours and the size, and to realize an electric work machine in which vibration transmission is prevented or suppressed as much as or more than the conventional one. ..
  • the electric work machine is a hammer drill having a plurality of switchable operation modes.
  • the hammer drill according to the present embodiment has at least three operation modes of "drill mode", "hammer mode", and "hammer drill mode". In the drill mode, only the rotational force is applied to the tip tool, and in the hammer mode, only the striking force is applied to the tip tool. On the other hand, in the hammer drill mode, both the rotational force and the striking force are applied to the tip tool.
  • a drill bit is an example of a tip tool attached to a hammer drill.
  • the drill bit is used, for example, when drilling a hole in concrete or stone.
  • the tip tool attached to the hammer drill is not limited to the drill bit, and is selected from a plurality of tip tools according to the object and the type of work on the object.
  • the hammer drill 1A has a main body housing 10 as a first member and a handle housing 20 as a second member, and the main body housing 10 and the handle housing 20 make the hammer drill 1A At least a part of the outer shell 2 is formed.
  • the main body housing 10 and the handle housing 20 are connected to each other so as to be relatively movable via an elastic body 30. The connection structure between the main body housing 10 and the handle housing 20 will be described in detail later.
  • the main body housing 10 houses a motor 40, which is a drive source for a tip tool (drill bit 3 in this embodiment), and a transmission mechanism 41 that transmits a driving force output from the motor 40 to the drill bit 3. ing.
  • the handle housing 20 forms a handle 21 that is gripped by an operator.
  • a trigger lever 22 is provided on the upper portion of the handle housing 20, and a battery mounting portion 23 is provided on the lower portion of the handle housing 20.
  • a battery battery pack 24 mounted on the battery mounting portion 23 to operate the motor 40. That is, the driving force is output from the motor 40.
  • the motor 40 housed in the lower part of the main body housing 10 is a brushless motor, and a cooling fan 42 and a pinion gear 43 are provided on the output shaft (output shaft) thereof.
  • the pinion gear 43 meshes with the bevel gear 44, which is an input portion of the transmission mechanism 41.
  • the transmission mechanism 41 includes an intermediate shaft 45 extending in a direction intersecting the output shaft, and the bevel gear 44 is fixed to an end portion of the intermediate shaft 45.
  • a conversion mechanism for converting the rotational motion of the intermediate shaft 45 into a reciprocating motion is provided on the intermediate shaft 45.
  • the conversion mechanism includes an inner ring, an outer ring, a rolling element, and a connecting rod.
  • the inner ring is fixed to the intermediate shaft 45, and the outer ring is arranged around the inner ring so as to surround the inner ring. Further, the rolling element is interposed between the inner ring and the outer ring, and the connecting rod projects from the outer peripheral surface of the outer ring toward the outer side in the radial direction of the outer ring. On the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring, grooves having an arcuate cross section are formed. A part of the rolling element is fitted in the groove formed in the inner ring, and the other part is fitted in the groove formed in the outer ring. That is, the inner ring and the outer ring are connected so as to be relatively rotatable via a rolling element.
  • a clutch is provided on the intermediate shaft 45 to switch between a engaged state in which power is transmitted from the intermediate shaft 45 to the conversion mechanism and an released state in which power is not transmitted from the intermediate shaft 45 to the conversion mechanism. There is.
  • the clutch cannot rotate relative to the intermediate shaft 45 and can move back and forth along the intermediate shaft 45.
  • the clutch retracts to a predetermined position (close to the inner ring)
  • the intermediate shaft 45 and the inner ring are connected via the clutch, and power is transmitted from the intermediate shaft 45 to the inner ring.
  • the clutch advances to a predetermined position (when separated from the inner ring)
  • the connection between the intermediate shaft 45 and the inner ring is released, and the power transmission from the intermediate shaft 45 to the inner ring is cut off.
  • the movement (switching) of the clutch as described above is realized according to the operation of switching the operation mode by the operator. If the intermediate shaft 45 rotates while the clutch is engaged, the inner ring rotates. Then, the outer ring rolls along the surface of the inner ring, and the connecting rod swings back and forth accordingly.
  • a cylinder 46 is provided above the intermediate shaft 45 in parallel with the intermediate shaft 45. On the outer periphery of the cylinder 46, a connected state in which the rotation of the intermediate shaft 45 is transmitted to the cylinder 46 and a non-connected state in which the rotation of the intermediate shaft 45 is not transmitted to the cylinder 46 can be moved back and forth along the cylinder 46.
  • the cylinder 46 houses a piston, a striking element and a meson.
  • the piston, striking element and meson are arranged in a row in this order from the rear to the front, and an air chamber is provided between the piston and the striking element.
  • a retainer sleeve 47 is provided in front of the cylinder 46, and the rear end of the retainer sleeve 47 is fixed to the tip of the cylinder 46 so as not to rotate relative to each other.
  • the root portion of the drill bit 3 is inserted into the retainer sleeve 47, and the retainer sleeve 47 holds the root portion of the inserted drill bit 3. Therefore, when the ring gear is switched to the connected state and the rotation of the intermediate shaft 45 is transmitted to the cylinder 46, the retainer sleeve 47 and the drill bit 3 held by the retainer sleeve 47 rotate.
  • a connecting rod of the conversion mechanism is rotatably connected to the back surface of the piston, and when the connecting rod swings back and forth, the piston reciprocates back and forth in the cylinder 46, and the pressure in the air chamber fluctuates. Then, the hammer is driven by the pressure fluctuation of the air chamber, the meson is hit by the meson, and the drill bit 3 is hit by the meson.
  • the clutch is released and the ring gear is engaged.
  • the intermediate shaft 45 rotates in this state, the inner ring of the conversion mechanism does not rotate, while the cylinder 46 rotates. Therefore, only the rotational force is applied to the drill bit 3 held by the retainer sleeve 47.
  • the handle housing 20 has two ends, each end of which is connected to the body housing 10 via an elastic body 30.
  • the handle housing 20 has an upper end portion 25 located near (upper) the trigger lever 22 and a lower end portion 26 located near (front) the battery mounting portion 23.
  • the main body housing 10 has an upper connecting portion 11 to which the upper end portion 25 of the handle housing 20 is connected, and a lower connecting portion 12 to which the lower end portion 26 of the handle housing 20 is connected. ..
  • the handle housing 20 and the main body housing 10 are relatively movable. In other words, the handle housing 20 is movable within a predetermined range with respect to the main body housing 10.
  • the elastic body 30 movably connecting the handle housing 20 to the main body housing 10 is formed on the handle housing 20 and the main body housing 10 by two-layer molding, and the handle housing 20 is formed. And a part of a series of resin covers 31 covering the surface of the main body housing 10. That is, the upper end portion 25 of the handle housing 20 is connected to the upper connecting portion 11 of the main body housing 10 via a part of a series of resin covers 31, and the lower end portion 26 of the handle housing 20 is a series. It is connected to the lower connecting portion 12 of the main body housing 10 via the other part of the resin cover 31 of the above.
  • a part of the resin cover 31 interposed between the upper end portion 25 of the handle housing 20 and the upper connecting portion 11 of the main body housing 10 is the end portion of the resin cover 31. It is one of. Further, the other part of the resin cover 31 interposed between the lower end portion 26 of the handle housing 20 and the lower connecting portion 12 of the main body housing 10 is other than the end portion of the resin cover 31. It is one of.
  • the end of the resin cover 31 interposed between the upper end 25 of the handle housing 20 and the upper connecting portion 11 of the main body housing 10 is referred to as an "upper end 32", and the handle housing 20
  • the other end of the resin cover 31 interposed between the lower end 26 and the lower connecting portion 12 of the main body housing 10 may be referred to as a "lower end 33".
  • the upper end portion 32 and the lower end portion 33 of the resin cover 31 will be described.
  • the upper end portion 32 and the lower end portion 33 have substantially the same shape and structure. Therefore, the shape and structure of the lower end portion 33 will also be clarified by explaining the shape and structure of the upper end portion 32 in detail with reference to FIGS. 2 and 3.
  • the upper end portion 32 has an annular intervening portion 32a sandwiched between the end surface 20a of the opposite handle housing 20 and the end surface 10a of the main body housing 10 and the intervening portion 32a.
  • the handle housing side engaging portion 32b which is located on the handle housing 20 side and engages with the engaging portion 27 formed on the surface of the handle housing 20, and the main body housing 10 side of the intervening portion 32a.
  • the main body housing side engaging portion 32c that engages with the engaging portion 13 formed on the surface of the main body housing 10 is included.
  • the upper end portion 32 has an annular intervening portion 32a, a handle housing side engaging portion 32b provided on one side of the intervening portion 32a, and a main body housing side engaging portion provided on the other side of the intervening portion 32a.
  • a part 32c and the like are included.
  • the handle housing side engaging portion 32b expands from one side of the intervening portion 32a toward the radial outer side of the intervening portion 32a, and then bends rearward by approximately 90 degrees to reach the surface of the handle housing 20.
  • the main body housing side engaging portion 32c extends from the other side of the intervening portion 32a toward the radial outer side of the intervening portion 32a, and then bends forward by approximately 90 degrees to reach the surface of the main body housing 10.
  • the upper end portion 25 of the handle housing 20 moves back and forth with respect to the main body housing 10 due to the elastic deformation of the upper end portion 32. More specifically, in the upper end portion 25 of the handle housing 20, the intervening portion 32a is elastically deformed so that the handle housing side engaging portion 32b and the main body housing side engaging portion 32c are close to each other or separated from each other. , Advances and retreats with respect to the main body housing 10. That is, the upper end portion 25 of the handle housing 20 is mainly movable back and forth with respect to the main body housing 10.
  • the lower end 33 of the resin cover 31 shown in FIG. 1 has substantially the same shape and structure as the upper end 32 shown in FIGS. 2 and 3. There is. Therefore, the lower end portion 26 of the handle housing 20 shown in FIG. 1 moves back and forth with respect to the main body housing 10 by elastically deforming the lower end portion 33 of the resin cover 31 in the same manner as the upper end portion 32. To do. That is, the lower end portion 26 of the handle housing 20 can move mainly back and forth with respect to the main body housing 10 like the upper end portion 25.
  • the handle housing 20 and the main body housing 10 shown in FIG. 1 are relative to each other via a part of a series of resin covers 31 formed by two-layer molding on the housings 20 and 10. It is connected so that it can be moved. Therefore, it is possible to prevent or suppress the vibration generated in the main body housing 10 from propagating to the handle housing 20 forming the handle 21. That is, in the hammer drill 1A according to the present embodiment, a part of the resin cover 31 covering the surfaces of the handle housing 20 and the main body housing 10 functions as a vibration isolator.
  • the resin cover 31, which partially functions as a vibration-proof member, is a resin molded body formed by two-layer molding on the handle housing 20 and the main body housing 10. Therefore, the number of parts and the simplified structure are smaller than those in the conventional case, so that the assembly man-hours can be reduced and the size can be reduced, and the vibration isolation effect equal to or higher than the conventional one can be obtained.
  • the material of the resin cover 31 in this embodiment is an elastomer, but the material of the resin cover 31 is not particularly limited. However, from the viewpoint of preventing or suppressing vibration transmission, it is preferable to mold the resin cover 31 with a material softer than the material of the main body housing 10 and the handle housing 20.
  • the resin cover 31 as described above is molded as follows, for example. As shown in FIG. 4, the material resin is supplied into the mold 50 to simultaneously mold the main body housing 10 and the handle housing 20 (primary molding). Although only the upper end portion 25 of the handle housing 20 and the upper connecting portion 11 of the main body housing 10 are shown in FIG. 4, the handle housing 20 and the main body housing 10 shown in FIG. 1 are actually shown. The whole of is molded by primary molding.
  • the molded handle housing 20 and the main body housing 10 are placed in another mold 51, and then the material resin (material resin () is placed in the mold 51 in which the handle housing 20 and the main body housing 10 are placed.
  • material resin material resin ()
  • an elastomer is supplied, and a resin cover 31 is formed on the handle housing 20 and the main body housing 10 (secondary molding). That is, by two-layer molding (sometimes referred to as "two-color molding"), a predetermined area on the surface of the handle housing 20 and the main body housing 10 is covered, and the upper end portion 32 and the lower end portion 33 (FIG. 1) are covered.
  • the resin cover 31 to be provided is molded. Although only the upper end 32 of the resin cover 31 and its vicinity are shown in FIG. 5, in reality, the entire resin cover 31 shown in FIG. 1 is molded by secondary molding. Will be done.
  • a regulating member 60a is interposed between the upper end portion 25 of the handle housing 20 and the upper connecting portion 11 of the main body housing 10.
  • a regulating member 60b is interposed between the lower end portion 26 of the handle housing 20 and the lower connecting portion 12 of the main body housing 10.
  • the handle housing 20 is movably connected to the main body housing 10 via an elastic body 30. Therefore, if the amount of movement of the handle housing 20 with respect to the main body housing 10 becomes too large, the elastic body 30 may be damaged.
  • the regulating members 60a and 60b regulate the movement amount of the handle housing 20 with respect to the main body housing 10 within a predetermined range, and prevent the elastic body 30 from being damaged.
  • the regulatory members 60a and 60b shown in FIG. 1 have substantially the same shape and structure. Therefore, with reference to FIGS. 2 and 3, the shape and structure of the regulating member 60a interposed between the upper end portion 25 and the upper connecting portion 11 will be described in detail with respect to the lower end portion 26. The shape and structure of the regulation member 60b interposed between the lower connecting portion 12 will also be clarified.
  • the regulating member 60a is composed of two metal plates 61 and 62 whose both ends in the longitudinal direction are bent by approximately 90 degrees. As shown in FIG. 2, the two metal plates 61 and 62 are arranged so as to be stacked back to back so as to straddle the upper end portion 25 and the upper connecting portion 11. Further, the bent portion 63 provided on one end side in the longitudinal direction of the metal plates 61 and 62 is inserted into the inside of the handle housing 20 through the slit 20b formed in the end surface 20a of the handle housing 20 and engages around the slit 20b. It's stopped.
  • the bent portion 64 provided on the other end side of the metal plates 61 and 62 in the longitudinal direction is inserted into the inside of the main body housing 10 through the slit 10b formed in the end surface 10a of the main body housing 10 and is inserted around the slit 10b. It is locked. That is, the bent portion 63 provided on one end side in the longitudinal direction of the metal plates 61 and 62 functions as a stopper for the upper end portion 25 of the handle housing 20 and is provided on the other end side in the longitudinal direction of the metal plates 61 and 62. The bent portion 64 is functioning as a retainer for the upper connecting portion 11 of the main body housing 10.
  • the amount of movement of the upper end portion 25 of the handle housing 20 with respect to the main body housing 10 is regulated within the range of the total length of the metal plates 61 and 62. More precisely, the amount of movement of the upper end 25 of the handle housing 20 is within the range (D) of the distance (D) between the bent portion 63 on one end side in the longitudinal direction and the bent portion 64 on the other end side in the longitudinal direction of the metal plates 61 and 62. Be regulated within.
  • the regulatory member 60b shown in FIG. 1 has substantially the same shape and structure as the regulatory member 60a shown in FIGS. 2 and 3. Therefore, the amount of movement of the lower end portion 26 of the handle housing 20 shown in FIG. 1 is also regulated within the range of the total length of the two metal plates constituting the regulating member 60b.
  • the electric working machine according to the present embodiment is a hammer drill having the same basic structure as the hammer drill 1A (FIG. 1) according to the first embodiment. Therefore, the differences from the hammer drill 1A according to the first embodiment will be mainly described, and the description of the same or substantially the same configuration will be omitted as appropriate.
  • the hammer drill 1B has a main body housing 10 as a first member and a handle housing 20 as a second member, and the main body housing 10 and the handle housing 20 are elastic bodies. It is connected so as to be relatively movable via 30.
  • connection structure between the main body housing 10 and the handle housing 20 shown in FIG. 6 is the same as the connection structure between the main body housing 10 and the handle housing 20 shown in FIG. That is, the main body housing 10 and the handle housing 20 shown in FIG. 6 are a part of a series of resin covers 31 formed on the housings 10 and 20 by two-layer molding (upper end 32, lower). It is connected so as to be relatively movable via the end portion 33).
  • the regulating members 60a and 60b included in the hammer drill 1B according to the present embodiment are different from the regulating members 60a and 60b included in the hammer drill 1A according to the first embodiment. Therefore, the regulating members 60a and 60b included in the hammer drill 1B according to the present embodiment will be described in detail.
  • the regulatory members 60a and 60b shown in FIG. 6 have substantially the same shape and structure. Therefore, the shape and structure of the regulating member 60b will be clarified by explaining the shape and structure of the regulating member 60a in detail with reference to FIGS. 7 and 8.
  • the regulating member 60a is composed of a plurality of metal plates 67 provided with large diameter portions 65 and 66 at both ends in the longitudinal direction.
  • Each of the metal plates 67 has the same shape and dimensions, and is arranged so as to be overlapped with each other so as to straddle the upper end portion 25 and the upper connecting portion 11.
  • elongated holes 68 are formed in the large diameter portions 65 and 66 of the respective metal plates 67.
  • the elongated holes 68 formed in the large diameter portions 65 communicate with each other, and the elongated holes 68 formed in the large diameter portions 66 communicate with each other. It is superimposed on.
  • a connecting pin 28 is provided in the upper end portion 25 of the handle housing 20 so as to penetrate the elongated hole 68 (FIG. 7) formed in the large diameter portion 65 of each metal plate 67. Both ends of the connecting pin 28 are engaged with the handle housing 20.
  • a connecting pin 14 penetrating the elongated hole 68 (FIG. 7) formed in the large diameter portion 66 of each metal plate 67 is provided, and the connecting pin 14 is provided. Both ends of the pin 14 are engaged with the main body housing 10.
  • the amount of movement of the upper end portion 25 of the handle housing 20 with respect to the main body housing 10 is regulated within the range of the interval (D) shown in FIG. That is, the amount of movement of the upper end portion 25 of the handle housing 20 with respect to the main body housing 10 is regulated within the range of the distance (D) between the two elongated holes 68 provided at both ends in the longitudinal direction of the metal plate 67.
  • the regulatory member 60b shown in FIG. 6 has substantially the same shape and structure as the regulatory member 60a shown in FIGS. 7 and 8. Therefore, the amount of movement of the lower end portion 26 of the handle housing 20 shown in FIG. 6 is also within the range of the distance between the two elongated holes provided at both ends in the longitudinal direction of the metal plate constituting the regulating member 60b. Be regulated within.
  • FIG. 9 and 10 show different examples of the electric work machine in which the main body housing 10 and the handle housing 20 are connected by substantially the same connection structure as the hammer drill 1B according to the present embodiment.
  • the electric working machine shown in FIG. 9 is a saver saw (sometimes referred to as a "reciprocating saw").
  • the electric working machine shown in FIG. 10 is a circular saw.
  • the saver saw 1C shown in FIG. 9 includes a motor 40 as a drive source, and is equipped with a tip tool (saw blade 3) that is reciprocally driven by a driving force output from the motor 40.
  • the circular saw 1D shown in FIG. 10 includes a motor (not shown) as a drive source, and is equipped with a tip tool (saw blade 3) that is rotationally driven by a driving force output from the motor. ..
  • the saver saw 1C shown in FIG. 9 and the circular saw 1D shown in FIG. 10 have a main body housing 10 and a handle housing 20 forming an outer shell 2. Further, the main body housing 10 and the handle housing 20 are connected so as to be relatively movable via the elastic body 30. Although the details of the connection structure between the main body housing 10 and the handle housing 20 are omitted, the elastic body 30 is formed on the main body housing 10 and the handle housing 20 by two-layer molding, and the surfaces of the housings 10 and 20 are formed. It is a part of the resin cover 31 that covers the housing.
  • the connecting portion between the main body housing 10 and the handle housing 20 is provided with regulating members 60a and 60b that regulate the amount of movement of the handle housing 20 with respect to the main body housing 10 within a predetermined range.
  • the electric working machine according to the present embodiment is a hammer drill having the same basic structure as the hammer drill 1A (FIG. 1) according to the first embodiment. Therefore, the differences from the hammer drill 1A according to the first embodiment will be mainly described, and the description of the same or substantially the same configuration will be omitted as appropriate.
  • FIG. 11 is a partial cross-sectional view of the hammer drill 1E according to the present embodiment.
  • the hammer drill 1E according to the present embodiment is common to the hammer drill 1A according to the first embodiment in that the main body housing 10 forming the outer shell 2 and the handle housing 20 are connected via an elastic body 30. Further, in the hammer drill 1E according to the present embodiment, the elastic body 30 connecting the main body housing 10 and the handle housing 20 is formed on the housings 10 and 20 by two-layer molding, and the surfaces of the housings 10 and 20 are formed. It is also common with the hammer drill 1A according to the first embodiment in that it is a part of the resin cover 31 (upper end portion 32, lower end portion 33) that covers the housing.
  • the hammer drill 1E according to the present embodiment is different from the hammer drill 1A according to the first embodiment in that the main body housing 10 and the handle housing 20 are connected via the connecting portion 70. That is, the main body housing 10 and the handle housing 20 in the hammer drill 1E according to the present embodiment are connected via both the elastic body 30 and the connecting portion 70.
  • FIG. 12A is an enlarged view of a portion C surrounded by a dashed-dotted line circle in FIG. That is, it is an enlarged view of the connection portion between the upper end portion 25 of the handle housing 20 and the upper connecting portion 11 of the main body housing 10.
  • the connecting portion 70 interposed between the upper end portion 25 of the handle housing 20 and the upper connecting portion 11 of the main body housing 10 is the first end connected to the main body housing 10.
  • a portion 71, a second end portion 72 connected to the handle housing 20, and an intermediate portion 73 connecting the first end portion 71 and the second end portion 72 are included.
  • the first end portion 71, the second end portion 72, and the intermediate portion 73 are integrally molded, but the wall thickness of the intermediate portion 73 is thinner than the wall thickness of the first end portion 71 and the second end portion 72.
  • the first end portion 71 extending from the main body housing 10 toward the handle housing 20 and the second end portion 72 extending from the handle housing 20 toward the main body housing 10 pass through an intermediate portion 73 thinner than them. It is connected.
  • the intermediate portion 73 which is thinner than the first end portion 71 and the second end portion 72, is a fragile portion having a lower strength than either the first end portion 71 or the second end portion 72. That is, the upper end portion 25 of the handle housing 20 is connected to the upper connecting portion 11 of the main body housing 10 via the connecting portion 70 including the elastic body 30 and the fragile portion.
  • the connection portion 70 interposed between the lower end portion 26 of the handle housing 20 shown in FIG. 11 and the lower connecting portion 12 of the main body housing 10 is the connection shown in FIG. 12A. It has the same shape and structure as the part 70. That is, the lower end portion 26 of the handle housing 20 is connected to the lower connecting portion 12 of the main body housing 10 via the connecting portion 70 including the elastic body 30 and the fragile portion, like the upper end portion 25.
  • a predetermined or greater force (F1) acting in the direction of bringing the handle housing 20 closer to the main body housing 10 is applied to the handle housing 20, or the handle housing 20 is separated from the main body housing 10.
  • F2 acting in the direction of causing the housing is applied, the connection portion 70 is destroyed.
  • the intermediate portion 73 which is a fragile portion in the connecting portion 70, breaks.
  • the intermediate portion 73 which is a fragile portion in the connecting portion 70, breaks as shown in FIG. 12 (c).
  • the elastic body 30, which is a part of a series of resin covers 31 covering the surfaces of the main body housing 10 and the handle housing 20, straddles the connection portion 70 and straddles the main body housing 10 and the handle housing 20. It covers the surface of the handle housing 20. Therefore, when a force (F1) is applied to the handle housing 20 and the intermediate portion 73 is broken as shown in FIG. 12 (b), the elastic body 30 is temporarily crushed. On the other hand, when a force (F2) is applied to the handle housing 20 and the intermediate portion 73 is broken as shown in FIG. 12 (c), the elastic body 30 is temporarily stretched.
  • the main body housing 10 and the handle housing 20 thereafter form only the elastic body 30. Connected via.
  • the main body housing 10 and the handle housing 20 are connected so as to be relatively movable.
  • the handle housing 20 can be moved mainly back and forth with respect to the main body housing 10, and vibration generated in the main body housing 10 is prevented or suppressed from propagating to the handle housing 20 forming the handle 21.
  • the intermediate portion 73 may be broken at the factory before the hammer drill 1E is shipped, or may be broken by the user who purchased the hammer drill 1E after the purchase.
  • the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist thereof.
  • the first member and the second member that are connected so as to be relatively movable via an elastic body are not limited to the main body housing 10 and the handle housing 20 described above.
  • the first member 91 and the second member 92 forming at least a part of the outer shell of the electric working machine can be relatively moved via the elastic body 30 and the connecting portion 70. It is connected.
  • the elastic body 30 shown in FIGS. 13 and 14 is formed by two-layer molding on the first member 91 and the second member 92, similarly to the elastic body 30 in each of the embodiments described so far. It is a part of a resin cover 31 that covers the surfaces of the first member 91 and the second member 92.
  • each of the connecting portions 70 shown in FIGS. 13 and 14 has substantially the same structure as the connecting portion 70 shown in FIGS. 11 and 12.
  • the handle 21 is formed by both the first member 91 and the second member 92. Specifically, as shown in FIG. 13, the first member 91 forms the front portion 21a of the handle 21, and the second member 92 forms the rear portion 21b of the handle 21.
  • a predetermined or greater force (F1) that acts in the direction of bringing the second member 92 closer to the first member 91 is applied to the second member 92 shown in FIG. 13, or the second member 92 is moved to the first member 91.
  • F2 a predetermined or greater force acting in a direction away from the above
  • the intermediate portion 73 in each connecting portion 70 is broken. That is, the plurality of connection portions 70 shown in FIGS. 13 and 14 are destroyed.
  • the connecting portion 70 When the connecting portion 70 is broken, the first member 91 and the second member 92 are subsequently connected via only the elastic body 30.
  • the first member 91 and the second member 92 are connected so as to be relatively movable.
  • the rear portion 21b of the handle 21 can move mainly back and forth with respect to the first member 91 including the front portion 21a of the handle 21.
  • the rear portion 21b of the handle 21 is a portion that mainly touches the palm of the operator who holds the handle 21.
  • the second member 92 shown in FIG. 15 can move (swing) relative to the first member 91 with the lower portion as a fulcrum after the connecting portion 70 is broken.
  • the shape of the connecting portion in the present invention is not limited to the shapes shown in the respective figures referred to so far.
  • the connecting portion in the present invention includes a first end portion connected to the first member, a second end portion connected to the second member, and the first end portion and the second end portion connecting the first end portion and the second end portion. It suffices to include an intermediate portion that is more fragile than the two ends, and its shape and the like are not particularly limited. Therefore, FIGS. 16A to 16D show some modifications of the connecting portion.
  • the connecting portion 70 shown in FIGS. 16A to 16D includes a first end portion 71, a second end portion 72, and an intermediate portion 73. Further, the intermediate portion 73 connecting the first end portion 71 and the second end portion 72 is thinner than the first end portion 71 and the second end portion 72, or at least the first end portion 71 and the second end. It contains a portion thinner than the portion 72, and is fragile as a whole than the first end portion 71 and the second end portion 72.
  • the connecting portion 70 shown in FIG. 16A includes an intermediate portion 73 that tapers from the second end portion 72 toward the first end portion 71, and the apex of the intermediate portion 73 is the first end. It is connected to the part 71.
  • the connecting portion 70 shown in FIG. 16B has an arc portion that bulges from the second end portion 72 toward the first end portion 71 and a connecting portion 70 that bulges from the first end portion 71 toward the second end portion 72.
  • An intermediate portion 73 including an arc portion to be output is provided, and the vertices of the two arc portions are connected to each other.
  • 16C includes an intermediate portion 73 that tapers from the first end portion 71 toward the second end portion 72, and the apex of the intermediate portion 73 is the second end. It is connected to the part 72.
  • the connecting portion 70 shown in FIG. 16D has a sharpened portion that tapers from the second end portion 72 toward the first end portion 71 and a tapered portion that tapers from the first end portion 71 toward the second end portion 72.
  • An intermediate portion 73 including a sharpened portion is provided, and the vertices of the two sharpened portions are connected to each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
  • Portable Power Tools In General (AREA)
PCT/JP2020/021327 2019-06-13 2020-05-29 電動作業機 Ceased WO2020250715A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US17/618,299 US20220331941A1 (en) 2019-06-13 2020-05-29 Electric working machine
CN202080043496.4A CN113993667B (zh) 2019-06-13 2020-05-29 电动作业机
DE212020000650.4U DE212020000650U1 (de) 2019-06-13 2020-05-29 Elektrische Arbeitsmaschine
JP2021525996A JP7355107B2 (ja) 2019-06-13 2020-05-29 電動作業機
EP20822128.3A EP3984671A4 (en) 2019-06-13 2020-05-29 ELECTRICAL WORKING MACHINE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019110559 2019-06-13
JP2019-110559 2019-06-13

Publications (1)

Publication Number Publication Date
WO2020250715A1 true WO2020250715A1 (ja) 2020-12-17

Family

ID=73782016

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/021327 Ceased WO2020250715A1 (ja) 2019-06-13 2020-05-29 電動作業機

Country Status (6)

Country Link
US (1) US20220331941A1 (https=)
EP (1) EP3984671A4 (https=)
JP (1) JP7355107B2 (https=)
CN (1) CN113993667B (https=)
DE (1) DE212020000650U1 (https=)
WO (1) WO2020250715A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023176760A (ja) * 2022-05-31 2023-12-13 工機ホールディングス株式会社 作業機

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7796602B2 (ja) * 2022-07-14 2026-01-09 株式会社マキタ 打撃工具

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5436071B2 (https=) * 1975-10-11 1979-11-07
JP2007331072A (ja) 2006-06-16 2007-12-27 Hitachi Koki Co Ltd 電動工具
JP5352412B2 (ja) * 2009-10-14 2013-11-27 株式会社マキタ 電動工具
JP2018153876A (ja) * 2017-03-15 2018-10-04 パナソニックＩｐマネジメント株式会社 電動工具

Family Cites Families (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908139A (en) * 1974-06-10 1975-09-23 Singer Co Portable power tools
US4081704A (en) * 1976-02-13 1978-03-28 Skil Corporation Powered hand-held tool with unitary sub-assembly mounted by the tool housing sections
US5531538A (en) * 1994-10-13 1996-07-02 Ryobi North America Portable electric power tool housing
DE102005047353A1 (de) * 2005-10-04 2007-04-05 Robert Bosch Gmbh Elektrowerkzeugmaschine
DE102006029630A1 (de) * 2006-06-28 2008-01-03 Robert Bosch Gmbh Handwerkzeugmaschine
DE102006050816B4 (de) * 2006-10-27 2015-10-22 Robert Bosch Gmbh Elektrohandwerkzeugmaschine
DE102006060652B4 (de) * 2006-12-21 2019-09-05 Robert Bosch Gmbh Bohr- oder Meißelhammer mit einem Faltenbalg
DE102007028382A1 (de) * 2007-06-20 2008-12-24 Robert Bosch Gmbh Handwerkzeugmaschinengehäuseeinheit
WO2009001592A1 (ja) * 2007-06-25 2008-12-31 Ryobi Ltd. 電動工具
DE102007030703A1 (de) * 2007-07-02 2009-01-08 Robert Bosch Gmbh Elastische Verbindung zwischen Gehäuseteilen motorisch angetriebener Werkzeugmaschinen
GB0801302D0 (en) * 2008-01-24 2008-03-05 Black & Decker Inc Handle assembly for power tool
GB0801305D0 (en) * 2008-01-24 2008-03-05 Black & Decker Inc A control mechanism for a power tool
US20090321101A1 (en) * 2008-06-26 2009-12-31 Makita Corporation Power tool
JP5361504B2 (ja) * 2009-04-10 2013-12-04 株式会社マキタ 打撃工具
JP5436071B2 (ja) 2009-07-02 2014-03-05 株式会社マキタ 作業工具
JP5502458B2 (ja) 2009-12-25 2014-05-28 株式会社マキタ 打撃工具
JP5468420B2 (ja) * 2010-03-04 2014-04-09 株式会社マキタ 手持ち式切断工具
JP2012139763A (ja) * 2010-12-28 2012-07-26 Hitachi Koki Co Ltd 動力工具
GB201112825D0 (en) * 2011-07-26 2011-09-07 Black & Decker Inc A hammer drill
EP2813326A1 (de) * 2013-06-13 2014-12-17 HILTI Aktiengesellschaft Werkzeugmaschine
US10076833B2 (en) * 2013-10-10 2018-09-18 Makita Corporation Electric tools
JP6334144B2 (ja) * 2013-11-26 2018-05-30 株式会社マキタ 往復動式作業工具
JP6441588B2 (ja) * 2014-05-16 2018-12-19 株式会社マキタ 打撃工具
JP6278830B2 (ja) * 2014-05-16 2018-02-14 株式会社マキタ 打撃工具
JP6727828B2 (ja) * 2016-02-05 2020-07-22 株式会社マキタ 動力工具
US10233657B2 (en) * 2016-03-25 2019-03-19 Tapper Tool Co., LLC Joiner
JP6399066B2 (ja) * 2016-09-27 2018-10-03 オムロン株式会社 トリガースイッチ
JP6953252B2 (ja) 2017-09-19 2021-10-27 株式会社マキタ 回転工具
JP6952261B2 (ja) 2017-11-10 2021-10-20 パナソニックＩｐマネジメント株式会社 電動工具

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5436071B2 (https=) * 1975-10-11 1979-11-07
JP2007331072A (ja) 2006-06-16 2007-12-27 Hitachi Koki Co Ltd 電動工具
JP5352412B2 (ja) * 2009-10-14 2013-11-27 株式会社マキタ 電動工具
JP2018153876A (ja) * 2017-03-15 2018-10-04 パナソニックＩｐマネジメント株式会社 電動工具

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3984671A4

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023176760A (ja) * 2022-05-31 2023-12-13 工機ホールディングス株式会社 作業機
JP7839396B2 (ja) 2022-05-31 2026-04-02 工機ホールディングス株式会社 作業機

Also Published As

Publication number Publication date
CN113993667B (zh) 2025-03-07
EP3984671A4 (en) 2022-11-30
DE212020000650U1 (de) 2022-03-23
EP3984671A1 (en) 2022-04-20
JP7355107B2 (ja) 2023-10-03
CN113993667A (zh) 2022-01-28
US20220331941A1 (en) 2022-10-20
JPWO2020250715A1 (https=) 2020-12-17

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