Patent ID: 7175513

Claim:
A portable power grinder comprising a housing, a rotating output shaft with a grinding wheel mounting device, a grinding wheel safety guard supported on the housing and adjustable between a number of pre-selected angular positions defined by a row of apertures in the safety guard, and a manually operable arresting device for locking the safety guard in any one of said pre-selected positions by engaging one of said apertures, wherein the arresting device comprises: a lock slide movably supported on the housing, an articulated lever having one end connected to said lock slide and an opposite end connected to the housing and arranged to move by folding and unfolding, respectively, said lock slide between a safety guard releasing position and a safety guard arresting position, said lever being arranged to be shifted between its unfolded position and its folded position via an over-center movement, and to positively arrest said lock slide in said safety guard arresting position by supporting in its unfolded position said lock slide relative to the housing, and a spring arranged to retain said lever firmly against the housing in said unfolded position.