Patent ID: 8640347

Claim:
A hand-operated jigsaw, comprising: a housing with a main hand grip attached to the housing; and a reciprocating drive mechanism operable via a motor; wherein the reciprocating drive mechanism includes a reciprocating body which is operable in a reciprocating motion along an axis via an eccentric of an eccentric wheel, wherein the eccentric wheel is arranged to rotate about a pivot axis oriented so that the eccentric wheel rotates in a plane that lies parallel to a housing plane extending through the housing, the main grip attached to the housing, and a battery arrangement securable to the main grip; wherein the reciprocating drive mechanism further includes an additional mass with a mass center of gravity, wherein the additional mass is embodied as one piece with, firmly connected to, or connected so as to be rotationally fixed with respect to the eccentric wheel on the pivot axis and minimizes vibrations; and wherein a center axis of the eccentric lies on a first radial of the pivot axis and is parallel to the pivot axis, wherein the first radial is offset from a second radial in an operating direction of rotation of the eccentric wheel at an angle of between 190° and 270°, and wherein the second radial lies between the mass center of gravity of the additional mass and the pivot axis.