Clamping Device
OwnerKlaus Hofmanninventor
Life of this patent
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Abstract
The invention relates to a tensioning device, especially for machine tools, in which a deforming tensioning element acts on a clamping part with a clamping force which results from the deformation in order to fix or release a fixing element.
Claims16
Tensioning device (1), especially for machine tools, with a fixing element (2), which can be inserted into a receptacle (5) and which features a longitudinal shaft (14), wherein the fixing element (2) is constructed as an indirect or direct support of a workpiece to be processed, and
- a) with at least one tensioning element (4) to be arranged on a body (3) for detachable fixing of the fixing element (2) in the receptacle (5), and
- b) with at least one clamping part (6) that can be acted upon by the tensioning element (4) with a clamping or releasing force (K),
- c) wherein the clamping part (6) is arranged so that it can be moved in the receptacle (5) by the clamping force (K) in one motion (B) for clamping or releasing the fixing element (2),
- d) wherein the tensioning element (4) includes at least one deformable chamber (7), which can be pressurized with higher pressure or lower pressure and which is bound by at least one wall (8) that is resistant to tension and pressure, such that a deformation force (S) generating the clamping force (K) for a pressure deforming the chamber (7) results essentially from the tension or pressure forces running in the longitudinal direction (L) of the wall (8) and resulting from the deformation of the chamber (7),
- characterized in that
- e) the chamber is constructed so that for an expansion of the chamber (7) in a first direction, the cross section of the chamber undergoes a change in length in a second direction perpendicular to the first direction.
Tensioning device according to one of the preceding claims, characterized in that the walls forming the chamber are constructed for generating a mechanical increase or reduction of fluid-dynamic compressive forces acting perpendicular to the walls into mechanical tensile or compressive forces running in the longitudinal direction (L) of the walls.
Tensioning device according to one of the preceding claims, characterized in that the chamber (7) is formed essentially from two opposing, closely spaced walls (8).
Tensioning device according to one of the preceding claims, characterized in that a wall (8) is constructed convex or concave relative to the interior of the chamber (7) in the state without pressurization with higher or lower pressure.
Tensioning device according to one of the preceding claims, characterized in that the clamping part (6) has a wedge surface (9), which runs at an angle to the clamping force (K) and which, for the motion (B), interacts with a surface (10) of the fixing element (2) for releasing or fixing the fixing element (2).
Tensioning device according to one of the preceding claims, characterized in that the fixing element (2) and/or the tensioning element (4) has an essentially rotationally symmetric structure.
Tensioning device according to one of the preceding claims, characterized in that the clamping part (6) is constructed as a slotted clamping ring surrounding the fixing element (2).
Tensioning device according to one of the preceding claims, characterized in that the clamping part (6) is biased against or in the direction of the clamping force (K).
Tensioning device according to one of the preceding claims, characterized in that the receptacle (5) includes a centering cone (11) interacting with the fixing element for a clamping force pressurization of the fixing element (2).
Tensioning device according to one of the preceding claims, characterized in that the body has at least 3 longitudinal grooves (19) oriented over the periphery about the longitudinal axis (14) and running in the radial direction as centering means for a workpiece to be inserted with the fixing element (2) into the receptacle (5).
Dependencies are inferred from the claim text.