Safety improvements for power tool

摘要

A hand-held power tool includes a cutting blade within a housing 5 and a guard 10 placed over the operating head of the tool. The guard is movable in the direction 1 in order to expose the blade during cutting. The sliding mechanism is improved by maintaining alignment between the guard and the head over a larger distance. In one embodiment, this is achieved by sliders (FIG. 8) in grooves 9. Contact over a larger range reduces the likelihood of jamming and improves handle precision. Alternative embodiments provide structure for indicating the blade position (FIG. 11), and a frangible retaining washer for disengaging the cutting blade (FIGS. 13 to 15).