| 摘要 |
The invention relates to portable power tool means intended to form part of a power tool or a conversion unit adapted to be fitted to the shaft of a power tool. The tool means includes a rotary cam member having an internal sinusoidal cam track in which cam followers of an output shaft are received. When the cam member rotates, the shaft is caused to partake of a lengthwise reciprocating movement suitable for application to a scraper bit or other tool kit such as a chisel. In an example of the invention, the shaft passes through a fixed bearing ring, a slidable sleeve being provided to control engagement of the shaft via a key member with portions of the ring or the cam member, so as to enable the shaft to partake of lengthwise movement or to be convertible to rotational movement, as selected by the operator. |
