| 摘要 |
A guard arrangement for a portable rotary cutter is provided which enables the position of a guard plate (12) for the cutter blades to be readily adjustably positioned in the most convenient position about the axis of rotation of the blade. In one arrangement, the hub of the guard plate is secured to an inner ring (15) the outer surface of which has notches (26) over half of its circumferential extent. Inner ring (15) is encircled by a slightly oval outer ring (20) guided for diametral movement. Outer ring (20) has internal detents (26) and is spring loaded to urge the detents in engagement with the notches. Outer ring (20) has an arm (22) constituting a handle for disengaging the detents from the notches to allow the guard plate and inner ring to be rotated into another position. In alternative constructions, equivalents of the detent and notches may be formed in axial faces of components of the guard arrangement, a releasable axial clamping device being provided to permit adjustment of the rotational position of the guard plate. |
