Title:
ENGINE-DRIVEN TOOL
Document Type and Number:
WIPO Patent Application WO/2014/162803
Kind Code:
A1
Abstract:
Provided is a braking device for an engine-driven tool, capable of stopping a cutting blade that is rotating by inertia, and also being lightweight and capable of maintaining long-term reliability. The engine-driven tool allows transmission of engine output through a centrifugal clutch to an implement such as a cutting blade, wherein the engine-driven tool is configured so that an eddy-current non-contact braking mechanism (40) is operated when a throttle is in a closed state. In the braking mechanism (40), a disc (35) is provided to the clutch drum (34) of the centrifugal clutch (30), and a permanent magnet is disposed so as to face a rotating body in a non-contact state in a positional relationship such that the magnetic field generated by the permanent magnet intersects the disc (35), whereby an eddy current produces a braking force in the rotating body, stopping the rotary motion of the cutting blade. When a throttle wire is pulled, the braking mechanism (40) is moved and the permanent magnet is moved away from the disc (35), whereby the brake is released.
Inventors:
KANAYA KENTAROU (JP)
ISHIDA SHIGETOSHI (JP)
ISHIDA SHIGETOSHI (JP)
Application Number:
PCT/JP2014/055093
Publication Date:
October 09, 2014
Filing Date:
February 28, 2014
Export Citation:
Assignee:
HITACHI KOKI KK (JP)
International Classes:
A01D34/76; H02K49/10
Foreign References:
| JPH077333U | 1995-02-03 | |||
| JP2002209420A | 2002-07-30 | |||
| JPH0614523A | 1994-01-21 | |||
| JP2012152109A | 2012-08-16 | |||
| JPH09275672A | 1997-10-21 |
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