Re-volv′ing-ham′mer.
A hammer revolving with a shaft. In Fig. 4305, the apparatus consists of an armature revolved by a crank which carries two hammers, whose handles, hinged respectively upon axes at the ends of the armature, may fold back upon the armature and upon opposite sides thereof in such manner that the hammers will rest upon supports attached to said armature lying within or nearly within the orbit of the axis to which the handles are secured, and the circle described by the armature. A rim or guard of unequal but proper curvature, which lies in the orbit of revolution of the armature, prevents the hammer from being thrown from its support by centrifugal force until it shall have passed beyond a plane projected vertically through the axis of the armature.Revolving-harrow. |