Axial chuck
AssigneeJosef Albrecht Bohrfutterfabrick GmbH & Co.
InventorManfred Selb
Life of this patent
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Abstract
A clamping sleeve/tensioning device comprises a clamping sleeve that is positioned inside a conical centering opening of a housing body. A chucking mechanism with rotational body is used to tighten or release the clamping sleeve. The rotational body is provided with a central opening, having an internal thread or an external thread, which directly engages in the clamping sleeve. The rotational body preferably is supported via a roller bearing on a corresponding bearing surface of the housing body. The rotational body is driven via a reducing gear, for example via a worm. As a result, high tensioning forces can be generated in connection with the relatively small diameter of the tensioning thread and the small conical angle. The small diameter of the tensioning thread ensures a low thread friction.
Claims32
A chuck comprising:
- a clamping element with an axial opening and a cone-shaped outer surface, which is connected to a hollow rearwardly extending axial shaft that is provided with a tensioning thread, with the outer surface determining a conical angle <3.5°;
- a housing body provided with a conically tapered axially extending centering opening in which at least a forward portion of the clamping element is disposed, and a holding chamber for a chucking mechanism, with the centering opening leading to the holding chamber;
- and
- a chucking mechanism including a rotational body that is disposed inside the holding chamber coaxial to the centering opening, and is mounted such that it can rotate and essentially cannot be displaced axially, with said rotational body having a thread that directly engages the tensioning thread of the clamping element, and actuation means connected to the rotational body for selectively rotating the rotating body to cause axial displacement of said clamping element;
- and wherein the tensioning thread connection has a radial play that exceeds any radial movement of the rotational body, caused by the actuating means.
A chuck comprising:
- a clamping element with an axial opening and a cone-shaped outer surface, which is connected to a hollow rearwardly extending axial shaft that is provided with a tensioning thread, with the outer surface determining a conical angle 3.5°;
- a housing body provided with a conically tapered axially extending centering opening in which at least a forward portion of the clamping element is disposed, and a holding chamber for a chucking mechanism, with the centering opening leading to the holding chamber;
- and
- a chucking mechanism including a rotational body that is disposed inside the holding chamber coaxial to the centering opening, and is mounted such that it can rotate and essentially cannot be displaced axially, with said rotational body having a thread that directly engages the tensioning thread of the clamping element, and actuation means connected to the rotational body for selectively rotating the rotating body to cause axial displacement of said clamping element;
- and
- wherein:
- the rotational body is supported on the housing body, in a tensioning direction for the clamping element, via a first axial thrust bearing;
- the rotational body is supported on the housing body, in the release direction for the clamping element, via a second axial thrust bearing;
- and each of said first and second thrust bearings is a roller bearing.
A chuck, comprising:
- a clamping element with an axial opening and a cone-shaped outer surface, which is connected to a hollow rearwardly extending axial shaft that is provided with a tensioning thread, with the outer surface determining a conical angle <3.5°;
- a housing body provided with a conically tapered axially extending centering opening in which at least a forward portion of the clamping element is disposed, and a holding chamber for a chucking mechanism, with the centering opening leading to the holding chamber;
- and
- a chucking mechanism including a rotational body that is disposed inside the holding chamber coaxial to the centering opening, and is mounted such that it can rotate and essentially cannot be displaced axially, with said rotational body having a thread that directly engages the tensioning thread of the clamping element, and actuation means connected to the rotational body for selectively rotating the rotational body to cause axial displacement of said clamping element;
- and
- wherein at least one of the outer surface of the clamping element and the housing wall defining the centering opening is provided with a friction-reducing coating.
Dependencies are inferred from the claim text.