| 摘要 |
<p>A drilling jig for assisting correct boring of pipe holes through joists and the like has an elongate box section body (14) having a shaft connectible to a portable rotary power tool (12) at one end and a drill chuck (18) at the other. A belt and pulley transmission extends between the shaft and the chuck which have mutually parallel axes of rotation. A support structure (24) is connected with the body (14) and includes (a) abutments (34) adapted to abut a joist or the like, and (b) a manually operable linkage (26, 28, 30) for effecting relative movement between the abutments (34) and the body (14) in a direction substantially axially of chuck (18) to enable a joist or the like to be drilled.</p> |
