Power tool having hammer mechanism

A power tool comprising:

• a case made of metal;
• a spindle axially supported inside the case;
• and
• a hammer mechanism including:
• a first cam, at least a portion of which is housed in the case and which is fixed to the spindle such that it is rotatable integrally therewith;
• a second cam, at least a portion of which is housed in the case, is rotatable separately with respect to the spindle and is provided such that it is capable of contacting the first cam;
• a switching member, which is provided such that it is movable, relative to the case, between a first position, at which rotation of the second cam is restricted, and a second position, at which the rotational restriction on the second cam is released;
• and
• a polymer member interposed between the case and the switching member and fixed relative to the case,
• wherein:
• the case includes a first slit configured to axially receive the polymer member, the first slit being defined by a first surface of the case and a second surface of the case, the second surface of the case being spaced circumferentially from the first surface of the case;
• the polymer member includes a second slit, the second slit being defined by a first surface of the polymer member and a second surface of the polymer member;
• the polymer member is mounted in the first slit between the first surface of the case and the second surface of the case;
• and
• the switching member is slidably mounted in the second slit between the first surface of the polymer member and the second surface of the polymer member for linear movement relative to the polymer member.

A power tool comprising:

• a metal case;
• a spindle rotatably supported inside the metal case;
• and
• a hammer mechanism including a first cam, a second cam, a first hammer-actuation device and a first linear plain bearing slidably supporting the first hammer-actuation device;
• wherein:
• the first cam is affixed to the spindle so as to rotate therewith;
• at least a portion of the first cam and at least a portion of the second cam are housed within the metal case;
• the second cam is disposed around the spindle and is axially movable to bring teeth of the second cam into and out of contact with teeth of the first cam;
• the first hammer-actuation device is movable in parallel to a rotational axis of the spindle from a first axial position relative to the spindle to a second axial position relative to the spindle, and vice versa;
• in the first axial position, rotation of the second cam relative to the metal case is blocked;
• in the second axial position, rotation of the second cam relative to the metal case is not blocked;
• the first linear plain bearing is fixed relative to the metal case and is more elastic than the metal case;
• the case includes a first slit configured to axially receive the first linear plain bearing, the first slit being defined by a first surface of the case and a second surface of the case, the second surface of the case being spaced circumferentially from the first surface of the case;
• the first linear plain bearing includes a second slit, the second slit being defined by a first surface of the first linear plain bearing and a second surface of the first linear plain bearing;
• the first linear plain bearing is mounted in the first slit between the first surface of the case and the second surface of the case;
• and
• the hammer-actuation device is slidably mounted in the second slit between the first surface of the first linear plain bearing and the second surface of the first linear plain bearing for linear movement relative to the first linear plain bearing.