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US 6,640,911 B2Granted
Device for connecting a tool to a drive
AssigneeAdolf Wuerth GmbH & Co. KG
InventorsKarl Lieser, Andreas Dierolf, Frank Kollmar
Life of this patent
Estimating the term…
Abstract
A device for connecting a tool to a mechanical drive contains as the coupling element a spring washer coupling or clutch, which is made in one piece from metal and at least in the rotation direction has a limited resilience. Use is made thereof for preventing torque peaks in the case of a sudden deceleration of the tool, e.g. if a screw strikes a wood surface.
Claims6
A connecting apparatus for connecting a rotary driving apparatus to a tool, the connecting apparatus comprising:
- a tool fixture (5) at one end for holding a tool;
- a driven element (1) at an opposite end for connection to the rotary driving apparatus, and
- a jointed cylindrical spring device (11) having a plurality of annular portions (15) connected by resilient web portions (16), said spring device (11) being coupled to, and axially extending beyond, the tool fixture (5) at one end and being coupled to, and axially extending beyond, the driven element (5) at an opposing end, such that the spring device (15) spans a gap (17) between the tool fixture (5) and the driven element (1), said spring device (11) being able to axially constrict in response to torsional force and to then axially extend in response to release of torsional force to reduce transmission of torsional impacts from the tool to the rotary driving apparatus;
- and
- wherein the webs (16) are made of an extruded, elastomeric plastic material which seals spaces between the annular members against intrusion of dirt or debris.
2 more elements
A connecting apparatus for connecting a rotary driving apparatus to a tool, the connecting apparatus comprising:
- a tool fixture (5) at one end for holding a tool;
- a driven element (1) at an opposite end for connection to the rotary driving apparatus, and
- a jointed cylindrical spring device (11) having a plurality of annular portions (15) connected by resilient web portions (16), said spring device (11) being coupled to, and axially extending beyond, the tool fixture (5) at one end and being coupled to, and axially extending beyond, the driven element (5) at an opposing end, such that the spring device (15) spans a gap (17) between the tool fixture (5) and the driven element (1), said spring device (11) being able to axially constrict in response to torsional force and to then axially extend in response to release of torsional force to reduce transmission of torsional impacts from the tool to the rotary driving apparatus;
- and
- wherein said spring device is coupled to the driven element (1) through an axially slideable, but non-rotational, element (12), and wherein said spring device (11) is also coupled to the tool fixture (5) through an axially slideable, but non-rotational, element (13) to allow axial travel of the driven element (1) and the tool fixture (5) relative to said spring device.
2 more elements
Dependencies are inferred from the claim text.