| 摘要 |
PCT No. PCT/GB92/02352 Sec. 371 Date Jun. 16, 1994 Sec. 102(e) Date Jun. 16, 1994 PCT Filed Dec. 18, 1992 PCT Pub. No. WO93/11910 PCT Pub. Date Jun. 24, 1993.The invention relates to portable power tool intended to form part of a power tool or a conversion unit adpated to be fitted to the shaft of a power tool. The tool includes a rotary cam member (6, 8) having an internal sinusoidal cam track (12) in which cam followers (26) of an output shaft (2) are received. When the cam member (6, 8) rotates, the shaft (2) 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 (86) passes through a fixed bearing ring (88), a slidable sleeve (96) being provided to control engagement of the shaft (86) via a key member (104) with portions of the ring (88) or the cam member (76), so as to enable the shaft (86) to partake of lengthwise movement or to be convertible to rotational movement, as selected by the operator.
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