Keyless router chuck

A tool receiver adapted to non-rotatably secure a tool at a driving device, said tool receiver being positioned within a conical surface of a driving device, the conical surface having a narrow end and a wide end opposite the narrow end, said tool receiver comprising:

• a plurality of blades which are positionable in a generally circular manner at the conical surface and are adapted to engage the conical surface of the driving device, said plurality of blades defining a generally circular opening which is adapted to receive the tool;
• and
• a biasing member which is adapted to bias said blades toward the narrow end of the conical surface such that said blades are biased in a retaining position by said biasing member and are adapted to non-rotatably secure a tool with respect to the said blades and the conical surface when in said retaining position, each of said plurality of blades including a tool engaging surface and a cone engaging surface opposite said tool engaging surface, said cone engaging surfaces being adapted to engage the conical surface of the driving device and said tool engaging surfaces defining said generally circular opening and being adapted to engage the tool, wherein said tool engaging surface of each of said blades has a first width and said cone engaging surface has a second width, said first width being greater than said second width.

A tool receiver adapted to non-rotatably secure a tool at a driving device, said tool receiver being positioned within a conical surface of a driving device, the conical surface having a narrow end and a wide end opposite the narrow end, said tool receiver comprising:

• a plurality of blades which are positionable in a generally circular manner at the conical surface and are adapted to engage the conical surface of the driving device, said plurality of blades defining a generally circular opening which is adapted to receive the tool;
• and
• a biasing member which is adapted to bias said blades toward the narrow end of the conical surface such that said blades are biased in a retaining position by said biasing member and are adapted to non-rotatably secure a tool with respect to the said blades and the conical surface when in said retaining position, wherein each of said blades has a thickness and a radial length, a ratio of said thickness to said radial length being no greater than a coefficient of friction between each of said plurality of blades and the tool.

A tool receiver adapted to non-rotatably secure a tool at a driving device, said tool receiver being positioned within a conical surface of a driving device, the conical surface having a narrow end and a wide end opposite the narrow end, said tool receiver comprising:

• a plurality of blades which are positionable in a generally circular manner at the conical surface and are adapted to engage the conical surface of the driving device, said plurality of blades defining a generally circular opening which is adapted to receive the tool;
• and
• a biasing member which is adapted to bias said blades toward the narrow end of the conical surface such that said blades are biased in a retaining position by said biasing member and are adapted to non-rotatably secure a tool with respect to the said blades and the conical surface when in said retaining position, wherein each of said blades has a radial length and is formed such that a ratio of an effective contact width of said blade with said conical surface to said radial length is no greater than a coefficient of friction between each of said plurality of blades and the tool.

A tool receiver adapted for mounting to a rotational driving device and for non-rotatably securing a tool therewithin, said tool receiver comprising:

• a plurality of blades, each of said plurality of blades having a thickness and a radial length extending radially from a generally circular opening defined by said plurality of blades;
• and
• a conical member which is adapted to be rotatably driven by a driving device, said conical member at least partially encasing said plurality of blades and biasing said plurality of blades radially inwardly such that when a tool is positioned at least partially within said opening defined by said plurality of blades, said plurality of blades engage said conical member and the tool, a ratio of said thickness to said radial length being no greater than a coefficient of friction between each of said plurality of blades and the tool.