| 摘要 |
An alignment device (10) for use in aligning a power tool blade or bit or a metal frame, includes: a) a generally rectangular-shaped body (26), the body (26) having thereon two opposite, substantially parallel and planar side surfaces (20, 22), substantially parallel and planar opposite top and bottom surfaces (14, 16), the top and bottom surfaces (14, 16) being positioned at substantially right angles to the side surfaces (20, 22), substantially planar rear and front surfaces (18, 12), the top and bottom surfaces (14, 16) and side surfaces (20, 22) being positioned at substantially right angles to four edges, respectively, of the rear surface (18), the front surface (12) being angled; b) at least two contact posts (36, 38) on the front or rear surface; c) a power source (50) within the device, the contact posts (36, 38) being connected to the power source; and d) a light source (46, 48) or sound source (49) connected with the power source (50); wherein the light source lights up or the sound source sounds when the contact posts (36, 38) contact a metal surface.
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