| 摘要 |
A power tool having a handle assembly 300 which is biased by a torsional spring 344 and extends within an axle 316 is described. Torsional spring 344 has an engaging arm 346 the position of which is fixed relative to the housing 312 by adjusting means 348. Adjusting means 348 has a lever 350 which extends outside the housing of the power tool, and a cam surface 352, and is mounted on and rotatable at least partially around an axle 354. In use, the tension in torsional spring 344 may be adjusted by movement of adjusting means 348. Lever 350 is moved, causing rotation of adjusting means 348 around axle 354. As a result, cam surface 352 causes arm portion 346 of spring 344 to be moved axially along axle 354 and more or less tension is applied to torsional spring 344. |
