| 摘要 |
A mitring device has a base (1), a top surface of which receives a fixed rim (2). A sawing guide member (6) which may be slidably mounted, is located along an imaginary longitudinal axis and the member has a longitudinal slot (7) located directly on the axis. A wedge-shaped member (11) is pivoted to arcuately move about rim (2). An end (20) of the base has a cut-away portion which is disposed to provide two symmetrical surfaces (15, 16) which extend about the imaginary axis. The sawing guide member has a vertically movable limb (14) which may be locked in position by knob (43) and the limb (14) contacts the surfaces (15, 16). In use the wedge-shaped member (11) is set at half the angle to be mitred and limb (14) is lowered into contact with surface (15) and the limb is then locked in position. A piece to be cut is placed against wedge-shaped member (12) and using the sawing guide slot (7) so a mitre is cut on the piece. The wedge-shaped member is rotated so that the limb (14) abuts surface (16) and a mitre is cut on an abutting piece. By use of this invention members to be mitred may be accurately cut and the use of symmetrically shaped surfaces (15, 16) ensures that angles that are cut are of equal and opposite sign. |
