Clamping claws are generally used to secure an object in a recess of a support. The clamping claws have a securing leg and a clamping leg, with the clamping claw in the installed state being secured on the support by way of its securing leg by means of a bolt and clamping the object in the recess by means of its clamping leg.
Such clamping claws are used, for example, as part of a cutting tool for machining metallic materials, with the support also being referred to as a gripping holder. The object that is clamped by means of the clamping claw in this connection is a cutting plate made from a ceramic material, hard metal or other material that is suitable for machining.
The underlying aim of the invention is to convert the application of axial force applied to an object by a clamping claw in part into an application of force that acts transversely thereto so that the object is pressed not only onto the support, but also onto the side wall of the recess.
The clamping claw includes two portions, namely a clamping base and a clamping finger.
The clamping base sits on the support in the installed state of the clamping claw.
The clamping finger has a securing leg and a clamping leg, and in the installed state the securing leg sits on the clamping base over an oblique plane formed as a sliding surface and clamps the object with its clamping leg.
During clamping the bolt presses the securing leg of the clamping finger onto the clamping base and secures both on the support, in which case as a result of the oblique plane that is formed as a sliding surface the securing leg and thus the clamping leg of the clamping finger execute a lateral movement transversely in relation to the longitudinal axis of the clamping base.
The application of force applied to the object by the clamping claw is split into an axial component and a component that acts transversely thereto.
So that the component that acts transversely in relation to the axial component draws the object into the recess of the support, a trough, for example, into which, for example, a cam on the clamping leg of the clamping finger engages, is arranged in the object.
The clamping base is advantageously secured on the support in a secure manner with respect to rotation, but so that it can be displaced in the clamping direction. To this end, at least one projection that extends parallel to the longitudinal axis of the clamping base and engages into a longitudinal slot in the support that is matched thereto is arranged on the clamping base.
In a preferred embodiment, the clamping base at its end that faces the securing leg of the clamping finger has an oblique plane that is formed as a sliding surface, and the securing leg of the clamping finger at its end that faces the clamping base likewise has an oblique plane that is formed as a sliding surface. Both sliding surfaces are matched to each other and are formed so that they slide one on top of the other.
The clamping base in the installed state preferably rests with a first guide surface against a second guide surface on the securing leg so that the securing leg of the clamping finger is arranged on the clamping base in a secure manner with respect to rotation. Since the clamping base also sits on the support in the installed state in a secure manner with respect to rotation, the clamping finger is also arranged on the support in a secure manner with respect to rotation. This is necessary in order to achieve correct clamping of the object.
Advantageously, the clamping base has a projecting flange with which the clamping base sits on a recess in the support in the installed state.
The clamping claw is preferably a part of a cutting tool for machining metallic materials, in which case the support is a gripping holder and the object is a cutting plate.
In an advantageous embodiment, arranged on the clamping leg of the clamping finger there is a raised portion, like a cam for example, which in the installed state engages into a corresponding trough in the object or in the cutting plate.
In a preferred development in accordance with the invention, the raised portion or the cam on the clamping leg of the clamping finger is formed as a circular ring which in the installed state engages into an object or a cutting plate that has a spherical or circular raised portion and in so doing embraces the raised portion.
The invention is explained in greater detail in the following with the aid of six figures.