Tool driving or impacting – Work cleansing – Cleansing fluid pump operated by drive
Patent
1990-10-15
1992-07-14
Yost, Frank T.
Tool driving or impacting
Work cleansing
Cleansing fluid pump operated by drive
173217, 408 56, 408 67, B23B 4734
Patent
active
051294672
ABSTRACT:
An electric hammer drill including a vacuum dust collecting device for collecting dust from an area of an article being drilled by a drill bit wherein a hose extending from a body of the hammer drill is directly connected to an end of a movable first pipe which is slidably received in a stationary second pipe. A fan for transporting the dust by vacuum is fixed on a shaft extending across a dust collecting chamber in the body. The shaft is coaxial with, and releasably coupled with, an armature shaft of a motor. With this releasable coupling, the armature shaft is relatively short and unlikely to bend or flex, so that vibration produced during a drilling operation is small. During the drilling operation, the first pipe slides back and forth along the second pipe as a suction hood moves in a direction opposite to the direction of movement of the drill bit. Since a sliding portion between the first and second pipes is separated by the hose from a path of conveyance of the dust, the first pipe and the hood connected thereto always move smoothly relative to the drill bit.
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Ohmori Yasuki
Sekizawa Masaaki
Watanabe Yoshihiko
Hitachi Koki Company Limited
Smith Scott A.
Yost Frank T.
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