Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
  • H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
  • H02K49/104—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
  • H02K49/106—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element with a radial air gap
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
  • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket

Definitions

• a magnetic impact device includes at least one chuck, at least one hammer and a driving unit.
• the at least one hammer is relatively movable with respect to the at least one chuck.
• One of the at least one hammer and the at least one chuck has at least one magnet.
• Another of the at least one hammer and the at least one chuck has at least one magnet or magnetic material.
• the driving unit is configured to move the at least one hammer relatively to the at least one chuck to magnetically generate impact motion of the at least one chuck.
• Fig. 3 is a schematic side view of a portable power tool according to an embodiment of the present invention.
• Fig. 8 is a schematic top plan view of the impact generator according to the embodiment of the present invention.
• Figs. 10(a)-10(c) are explanatory illustrations for explaining an operation of the magnetic impact device according to the embodiment of the present invention using a mechanical analogy of a ball rolling on a curved surface under an influence of gravity;
• the hammer 4 is, for example, a solid plate.
• the chuck 6 is, for example, a frame which can accommodate the hammer 4 within the frame.
• the hammers 4 are connected to a circumferential
• the impact generator 2 includes, for example, nine hammers 4.
• the hammer 4 has both side faces (4a) which extend from the axis Z and are substantially perpendicular to the X-Y plane.
• the hammer 4 has, for example, a substantially fan-shaped cross section taken along the X-Y plane.
• a central angle ( ⁇ h) of the hammer 4 between the side faces (4a) is, for example, about 20°.
• the impact generator 2 includes, for example, nine chucks 6. Although the number of the hammers 4 is the same as that of the chucks 6 in the present embodiment, these numbers may be different.
• the chuck 6 is, for example, substantially trapezoidal in a top plan view (see Fig. 5).
• the chuck 6 may have a substantially fan-shaped form in the top plan view. ln the present embodiment, a central angle ( ⁇ c) of the chuck 6 is, for example,
• the angular space ( ⁇ cs) between the chucks 6 is, for example,
• the function of the first and second yokes (4c and 4d) is to collect the magnetic field emanated by the permanent magnet (4b) and to direct the magnetic field to the chucks 6.
• the outer circumferences of the permanent magnet (4b) and the first and second yokes (4c and 4d) are arc-shaped in the X-Y plane.
• the central angle ( ⁇ m) of the arc of the permanent magnet (4b) is, for example,
• the energy to be stored in the air gap may increase, because the mechanical spring 12 is provided between the motor 10 and the hammer 4 as shown in Fig. 14. Namely, the spring 12

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Mechanical Engineering (AREA)
• Percussive Tools And Related Accessories (AREA)
• Apparatuses For Generation Of Mechanical Vibrations (AREA)
• Road Signs Or Road Markings (AREA)
• Spinning Or Twisting Of Yarns (AREA)
• Magnetic Resonance Imaging Apparatus (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (2)

Family

ID=31187594

Family Applications (1)

Country Status (7)

Cited By (2)

Families Citing this family (8)

Family Cites Families (14)

• 2002
  • 2002-08-05 US US10/211,539 patent/US6695070B1/en not_active Expired - Fee Related
• 2003
  • 2003-07-29 JP JP2004525796A patent/JP2005523175A/ja active Pending
  • 2003-07-29 AT AT03766658T patent/ATE339028T1/de not_active IP Right Cessation
  • 2003-07-29 DE DE60308140T patent/DE60308140T2/de not_active Expired - Lifetime
  • 2003-07-29 CN CNB038014149A patent/CN100336288C/zh not_active Expired - Fee Related
  • 2003-07-29 EP EP03766658A patent/EP1461186B1/en not_active Expired - Lifetime
  • 2003-07-29 WO PCT/JP2003/009618 patent/WO2004012910A2/en not_active Ceased

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