| 摘要 |
<p>A rotary hammer known as a percussion tool used for drilling concrete and rocks comprises a vibrating mechanism installed inside the hammer body (1), a cylinder (24) for guiding the vibrating mechanism having a piston-like drive member (26) which is driven by an electric motor (11) through a motion conversion transmission mechanism (27) which converts rotary motion into axial reciprocating motion, the reciprocating motion of the drive member (26) imparting axial percussive vibrations to a tool (29), such as a drill bit, held at the front end of the hammer body (1) through a striker (28) axially movably installed in the cylinder (24), and a tool holding member (37) for concommittantly rotatably holding the tool (29) adapted to be rotated by transmission of rotation from motor (11), rotation being imparted to the tool.</p><p>The hammer body (1) has
<UnorderedLists id="ula01" listStyle="none"><ListItem>(a) an electric motor section (A) which comprises a receiving section (10a) for receiving transmission mechanisms including a motion conversion transmission device (27) and the vibrating mechanism inside a frame (10) which serves as a shell barrel which opens axially of the vibrating mechanism, and in which the electric motor (11) is installed with its axis extending parallel to the axis of the vibrating mechanism adjacent the receiving section (10a),</ListItem><ListItem>(b) a vibration and transmission mechanism section (B) in which the transmission mechanisms including the motion conversion transmission mechanism (27) and the vibrating mechanism having the cylinder (24) internally provided with the piston (26) and striker (28) are held by a bracket (21) removably connected to one opening in the frame (10) of the electric motor section (A), and</ListItem><ListItem>(c) a tool holding section (C) in which the tool holding member (37) for concomittantly rotatably holding the tool (29) is rotatably supported by a bracket (53) removably connected to the other opening in the frame (10) of the electric motor section (A) associated with the side for receiving the vibrating mechanism and the like.</ListItem></UnorderedLists></p><p>These sections (A, B, C) are so arranged that they can be assembled and disassembled individually as separate component units. </p> |
