PERCUSSION TOOL (VARIANTS) Russian patent published in 2008 - IPC B25B21/02 

FIELD: percussion tools generating percussion-rotation motion for performing desired work.

SUBSTANCE: tool includes motor, striker driven to rotation and axial motion by means of driving effort generated by motor; block periodically engaging with striker during rotation and axial motion of striker and disengaging with striker; holder mounted on said block. Block includes first joined member which includes sector cams of first convex-concave portion arranged in side opposite to side turned to striker and which is made with possibility of multiple engagement with striker and disengagement with it. Said block also includes second joined member which has sector cams of second convex-concave portion capable to engage with sector cams of first convex-concave portion of first joined member in direction of rotation and which supports holder. Block also includes rubber shock absorber (in the form of elastic body) arranged between first and second joined members for preventing direct engagement between sector cams of first convex-concave portion and sector cams of second convex-concave portion in direction of rotation and in axial direction.

EFFECT: decreased noise level.

5 cl, 12 dwg