US 2009/0023371 A1Published application

Power-Driven Hand Tool

AssigneeC. & E. Fein GmbH

InventorsJuergen Blickle, Uwe Frueh

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Abstract

A power-driven hand tool comprises a drive spindle adapted to drive a tool, that can be driven to oscillate about its longitudinal axis, which tool can be fixed on a retaining section of the dive spindle by a securing element, and further comprises a displacing device that serves to displace the securing element between a releasing position in which the securing element can be released from the drive spindle and a clamping position in which the securing element is clamped on the retaining section by a spring element, the securing element comprising a clamping shaft adapted to be inserted into the securing element, which is axially fixed in the drive spindle for clamping the tool in the clamping position, and which can be detached in the releasing position. For clamping of the tool a split chuck is provided which is clamped on the retaining section by the securing element in the clamped position and is connected with the retaining section in form-locking engagement.

Claims20

Dependent claims

A power-driven hand tool comprising:

a hollow drive spindle for driving a tool, said drive spindle being configured to move oscillatingly about a longitudinal axis thereof;
a split chuck for fixing said tool on a retaining section of said drive spindle, said split chuck being configured for engaging a mounting opening of said tool in a form-locking way and for engaging an inner surface of said drive spindle in a form-locking way;
a securing element comprising a clamping shaft configured for insertion through said split chuck into said drive spindle;
a displacing assembly for displacing said securing element between a releasing position in which said securing element and said split chuck are free to be released from said drive spindle, and between a clamping position in which said securing element extends through said split chuck and is axially fixed within said drive spindle, said split chuck clamping against said retaining section of said drive spindle for securing said tool therebetween;
a spring element biasing said displacing assembly into said clamping position;
and
a lock assembly received inside said drive spindle between said displacing assembly and said split chuck for locking said clamping shaft against retraction in said clamping position and for releasing said clamping shaft allowing retraction from said drive spindle in said releasing position;
wherein said lock assembly further comprises a sleeve and a plurality of clamping pieces held by said sleeve radially displaceably against said clamping shaft and axially displaceably within said drive spindle.

5 more elements

A power-driven hand tool comprising:

a hollow drive spindle for driving a tool, said drive spindle being configured to move oscillatingly about a longitudinal axis thereof;
a split chuck for fixing said tool on a retaining section of said drive spindle, said split chuck being configured for engaging a mounting opening of said tool in a form-locking way and for engaging an inner surface of said drive spindle in a form-locking way;
a securing element comprising a clamping shaft configured for insertion through said split chuck into said drive spindle;
a displacing assembly for displacing said securing element between a releasing position in which said securing element and said split chuck are free to be released from said drive spindle, and between a clamping position in which said securing element extends through said split chuck and is axially fixed within said drive spindle, said split chuck clamping against said retaining section of said drive spindle for securing said tool therebetween;
and
a spring element biasing said displacing assembly into said clamping position.

3 more elements

A power-driven hand tool comprising:

a hollow drive spindle for driving a tool, said drive spindle being configured to move oscillatingly about a longitudinal axis thereof;
a split chuck for fixing said tool on a retaining section of said drive spindle, said split chuck being configured for engaging a mounting opening of said tool in a form-locking way and for engaging an inner surface of said drive spindle in a form-locking way;
a securing element comprising a clamping shaft configured for insertion through said split chuck into said drive spindle;
a displacing assembly for displacing said securing element between a releasing position in which said securing element and said split chuck are free to be released from said drive spindle, and between a clamping position in which said securing element extends through said split chuck and is axially fixed within said drive spindle, said split chuck clamping against said retaining section of said drive spindle for securing said tool therebetween;
a spring element biasing said displacing assembly into said clamping position;
and
a lock assembly received inside said drive spindle between said displacing assembly and said split chuck for locking said clamping shaft against retraction in said clamping position and for releasing said clamping shaft allowing retraction from said drive spindle in said releasing position;
wherein said lock assembly further comprises a sleeve and a plurality of clamping pieces held by said sleeve radially displaceably against said clamping shaft and axially displaceably within said drive spindle;
and
wherein said split chuck comprises at least one of a polygonal section and a curved section configured for form-locking engagement with said mounting opening of said tool.

7 more elements

Dependencies are inferred from the claim text.