US 6,035,945 AGranted

Operating mode switching apparatus for a hammer drill

AssigneeHitachi Koki Co., Ltd.

InventorsToshihiro Ichijyou, Yukio Terunuma

Life of this patent

Estimating the term…

Loading patent…

Abstract

A second pinion is rotatably supported around an intermediate shaft and slidable in an axial direction of the intermediate shaft. A pinion sleeve is fixed to the intermediate shaft. A first clutch mechanism selectively engages and disengages the second pinion with and from the pinion sleeve to selectively transmit and interrupt a rotational force of a motor to a tool attached on a front end of a hammer drill. A sleeve is supported around the intermediate shaft so as not to be rotatable about the intermediate shaft but slidable in the axial direction of the intermediate shaft. A motion converting member is rotatably supported around the intermediate shaft. The motion converting member converts the rotational force of the motor into the percussion force. A second clutch mechanism selectively engages and disengages the motion converting member with and from the sleeve to selectively transmit and interrupt the percussion force to the tool.

Claims5

Dependent claims

A hammer drill having a motor, a rotation transmitting mechanism transmitting a rotational force to a tool attached to said hammer drill, and a percussion mechanism transmitting a percussion force to said tool, said rotation transmitting mechanism comprising:

a pinion disposed on an intermediate shaft so as to be rotatable about said intermediate shaft and slidable in an axial direction along said intermediate shaft;
a first sleeve fixed to said intermediate shaft;
and
a first clutch mechanism selectively engaging said pinion with said first sleeve to transmit a rotational force of said motor to said tool, and disengaging said pinion from said first sleeve to interrupt the transmission of the rotational force to said tool;
said percussion mechanism comprising:
a second sleeve supported around said intermediate shaft, said second sleeve being non-rotatable with respect to said intermediate shaft but slidable axially along said intermediate shaft;
a motion converting member rotatable supported on said intermediate shaft, said motion converting member converting the rotational force of said motor into the percussion force;
and
a second clutch mechanism selectively engaging said motion converting member with said second sleeve to transmit said percussion force to said tool, and disengaging said motion converting member from said second sleeve to interrupt the transmission of said percussion force to said tool, and
said hammer drill further comprising:
a first spring interposed between said second sleeve and said pinion, said first spring applying a bias to both of said second sleeve and said pinion;
a rotation restricting member axially slidable along said intermediate shaft to shift said pinion and said second sleeve;
a second spring for applying a bias to said rotation restricting member;
and
a third clutch mechanism for engaging said rotation restricting member with said pinion.

12 more elements

a pinion disposed on an intermediate shaft so as to be rotatable about said intermediate shaft and slidable in an axial direction along said intermediate shaft;
a first sleeve fixed to said intermediate shaft;
and
a first clutch mechanism selectively engaging said pinion with said first sleeve to transmit a rotational force of said motor to said tool, and disengaging said pinion from said first sleeve to interrupt the transmission of the rotational force to said tool;
said percussion mechanism comprising:
a second sleeve supported around said intermediate shaft, said second sleeve being non-rotatable with respect to said intermediate shaft but slidable axially along said intermediate shaft;
a motion converting member rotatable supported on said intermediate shaft, said motion converting member converting the rotational force of said motor into the percussion force;
and
a second clutch mechanism selectively engaging said motion converting member with said second sleeve to transmit said percussion force to said tool, and disengaging said motion converting member from said second sleeve to interrupt the transmission of said percussion force to said tool, and
said hammer drill further comprising:
a first spring interposed between said second sleeve and said pinion, said first spring applying a bias to both of said second sleeve and said pinion;
a rotation restricting member axially slidable along said intermediate shaft to shift said pinion and said second sleeve;
a second spring for applying a bias to said rotation restricting member;
and
further comprising a switching member slidably provided on an outer casing of the hammer drill, said switching member having an inner portion linked with said rotation restricting member for changing an operating mode by manipulating said switching member.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/014,706Filed 28 Jan 1998
Priority: JP 9-10177018 Apr 1997
Granted: 14 Mar 2000
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B25D 16/00
Portable percussive machines with superimposed rotation , the rotational movement of the
B25D 11/062
Means for driving the impulse member: comprising a wobbling mechanism, swash plate
B25D 16/006
Portable percussive machines with superimposed rotation , the rotational movement of the output shaft of a motor being modified to generate…
B25D 2211/061
Means for driving the impulse member: swash-plate actuated impulse-driving mechanisms