Impact drill

An impact drill minimizing transmission of vibration to a handle (406) gripped by a user's hand. A spindle (2) extends through a main frame (1) and is movable in its axial direction and rotatablea about its axis. A first ratchet (4) is rotatable and axially movable together with the spindle (2)...

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Bibliographic Details
Main Authors KATAOKA KENJI, OHZEKI KAZUHIDE, TOUKAIRIN JYUNICHI
Format Patent
LanguageEnglish
Published 16.02.2005
Edition7
Subjects
BORING
HAND TOOLS
MACHINE TOOLS
MANIPULATORS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
PERCUSSIVE TOOLS
PERFORMING OPERATIONS
PORTABLE POWER-DRIVEN TOOLS
TRANSPORTING
TURNING
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Summary:An impact drill minimizing transmission of vibration to a handle (406) gripped by a user's hand. A spindle (2) extends through a main frame (1) and is movable in its axial direction and rotatablea about its axis. A first ratchet (4) is rotatable and axially movable together with the spindle (2). A second ratchet (5) is axially movable but unrotatable. The first ratchet (4) has a first serrated surface and the second ratchet has a second serrated surface in. confrontation with the first serrated surface. In an impact drilling mode, the first serrated surfaces is brought into abutment with the second serrated surface so that the spindle (2) is reciprocally moved in the axial direction. A spring (20) is interposed between the main frame (1) and the second ratchet (5) to urge the second ratchet (5) toward the first ratchet (4). In the drilling mode, the second ratchet (5) is always out of contact from the main frame and is floatingly maintained within the main frame (1) even if a force ranging from 15 to 25 kg is applied to the main frame (1) toward a workpiece (19).
Bibliography:Application Number: CN200410056342