Capped head hammer

Abstract

Retaining means for holding a fastening cross-pin that holds a removable cap mounted to a pole of a hammer thus providing a selected type of cap impact face for the hammer head. The cap forms a chamber and the pole is removably slidably fitted into the pole chamber. The fastening cross-pin is removably positioned in cap pin holes in the cap cylindrical wall and to a pole pin hole so as to removably secure the cap to the pole and also so as to allow the pole to move relative to the cap in the longitudinal dimension between an impact mode position of the cap impact face against a workpiece and a static mode position of the cap impact face remote from the workpiece. A biasable pad for absorbing shock is positioned within the chamber formed in the cap between the cap impact face and the pole. The fastening cross-pin extends through the pole pin hole and is connected to the cap side walls. The fastening cross-pin is in contact with the front surface of the pole pin hole in the static mode and moves to a free position in the pole pin hole in the impact mode so that the cross-pin avoids shear during the impact mode. Two types of retaining means are described: one type is an external retaining ring that is set into a groove around the cap that is aligned with both ends of the cross-pin; another type is an internal expansion retaining ring that is also the fastening cross-pin that is biased against the pin holes in the cap cylindrical wall.

Dependencies are inferred from the claim text.