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US 5,177,905 AGranted
Tool attaching/detaching device
AssigneeRyobi Ltd.
InventorsShoji Takahashi, Kouichi Miyamoto
Life of this patent
Estimating the term…
Abstract
A tool attaching/detaching device is disclosed in which a tool depressing member is slidingly engaged with a body portion of a clamp nut, and balls are inserted into spaces defined between taper surface portions of the clamp nut and taper surface portions of the tool depressing member. A ring member is used to cover the spaces. An inner diameer of the ring member is changed along its inner circumferential surface.
Claims5
A tool attaching/detaching device comprising:
- a tool mounting portion having a screw portion for fastening a rotary tool onto a tip end portion of a spindle;
- a flange member provided on said tool mounting portion for receiving said rotary tool;
- and
- a fastening means for fastening and fixing said rotary tool relative to said flange member;
- said fastening means including:
- a clamp member threadedly engaged with the tool mounting portion and having a flanged portion provided with a taper surface portion and a body portion having a screw portion threadedly engageable with the screw portion of said tool mounting portion, said flanged portion and said body portion being formed integrally with each other;
- a tool depressing member having a taper surface portion facing the taper surface portion of said flanged portion;
- a ring-shaped rotary operational member for covering a space defined by said tool depressing member and said flanged portion, said ring-shaped rotary operational member having, on its inner circumferential surface, a plurality of projections extending radially inwardly, the inner circumferential surface between the adjacent projections being formed so that an inner diameter is changed;
- and
- balls each of which is in contact with the taper surface portion of said tool depressing member and the inner circumferential surface of said rotary operational member and is normally depressed by spring means so that the ball is located at a position where the inner diameter of the inner circumferential surface of said rotary operational member is kept at a maximum length;
- wherein when said tool is fastened to said spindle, the ball clamped by the taper surface portion of said flanged portion and the taper surface portion of said tool depressing member is moved radially inwardly by the change in diameter of the inner circumferential surface of said rotary operational member, so that the tool depressing member is slidingly moved in a direction in which the tool depressing member depresses said tool.
8 more elements
Dependencies are inferred from the claim text.