Arrangement for converting rotary motion to reciprocatory motion

A power tool, comprising:

• an electric motor;
• a mechanism arranged to be driven by the electric motor and to reciprocate an operating tool member when present;
• said mechanism comprising a first member mounted for reciprocation along an axis, a second member mounted for rotation about an axis at right angles to said axis of reciprocation, and a link coupled at one end to said first member and at the other end to said second member at a position spaced from said axis of rotation whereby rotation of said second member by the electric motor reciprocates said first member and also imparts a cyclic partial rotation thereto about said axis of reciprocation;
• said second member having a bore therein spaced from said axis of rotation and inclined there towards in the general direction of said link from said other end to said one end, said bore having an axis which intersects said axis of rotation and makes an angle therewith of about one quarter of the angle through which said first member partially rotates;
• and
• said one end of said link being rigidly connected to said first member, and said other end of said link being mounted in said bore for movement therein along the axis thereof;
• whereby said link is never aligned with the axis of said bore, and the inclination of said link to the axis of said bore in the middle portion of the path of reciprocation of said first member is reduced to less than it would be if said bore were not inclined.