Work holders – With fluid means – With movable diaphragm
Patent
1995-02-27
1997-01-14
Watson, Robert C.
Work holders
With fluid means
With movable diaphragm
269 20, 254 93HP, B25B 1100
Patent
active
055931464
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention pertains to a hydraulically operated, bar-like clamping tool with an elongated base body, and elongated clamping body that can be moved in reciprocating fashion to the base body, and arranged between these two bodies a tubular inflatable body for moving the clamping body, wherein the inflatable body is secured in a fluid-tight manner at one end and is connected at its other end to a fluid connection
BACKGROUND OF THE INVENTION
A clamping tool of that type is known from the FR disclosure document 2 125 216. It consists of an elongated base plate on which an elongated, straight tube section lies, which is secured at both of its ends and at both ends of the base plate by means of plate-shaped crosspieces and screws. The tube section is provided on its upper side with an elongated clamping body, which comes to rest against a workpiece. The tube section exhibits a fluid connection at its one end. When the tube section is inflated, the clamping body lifts and presses against the workpiece that is to be lifted, for example. Only a limited lifting force can be generated with this tool, and in addition, the tool is a relatively large tool in relation to the size of the force it deploys.
In addition, there is described in another FR disclosure document 2 220 701 a clamping tool with which, by means of a tubular inflatable body, a plate-shaped clamping body is forced away from a base body that is likewise plate-shaped, so that the clamping body comes to rest against a workpiece and the latter is restrained in this way. In order to generate an increased clamping force, the tool is configured in such a way that the base body exhibits several reinforcing ribs that are parallel to each other and the clamping body exhibits several pressure ribs that are parallel to each other, whereby the ribs of both bodies mesh together in a comb-like fashion. In conjunction with this, the tubular inflatable body is guided between the ribs of both bodies in a serpentine fashion in such a way that when it is provided with hydraulic fluid, it presses the clamping body away from the base body. The multiple serpentine segments of the inflatable body deploy a correspondingly multiplied force deployment, and transmit this force to the clamping body. Since this tool is supposed to deploy unusually high forces, because it is used for vise purposes, by way of example, it is also of a voluminous size and accordingly needs a correspondingly large set-up location, and is, as a result of its complicated form, burdened with corresponding manufacturing costs.
SUMMARY OF THE INVENTION
The task of the invention therefore consists in improving a hydraulically operated, bar-like clamping tool of the type described by way of introduction in such a way that it can deploy the greatest possible clamping forces in relation to its relatively small volume dimensions, and is also simply designed and able to be manufactured at reasonable cost.
The solution to this task starts from the hydraulically operated, bar-like clamping tool of the type described by way of introduction, and is further characterized by the fact that the base body and the clamping body each consists of a U-shaped section with legs that mesh with each other, that in the base body between its legs there are provided an elongated, reciprocating thrust piece that is adjacent to the ends of the legs of the clamping body and a fixed, elongated abutment, that the tubular inflatable body extends on the one hand between the base body and the thrust piece and, after it is deflected, between the abutment and the clamping body on the other hand, and that the U-shaped base body exhibits a shutting off arrangement at least at its end that exhibits the fluid connection.
By means of this solution, a clamping tool is created in the form of a tensioning bar that is compact in design and can deploy a very large clamping force relative to its size. In addition, the tool can be produced using few and simple components, so that it can also be produced at a reasonable cost
REFERENCES:
patent: 3010698 (1961-11-01), Allen et al.
patent: 3048386 (1962-08-01), Thumim
patent: 3924843 (1975-12-01), Hirmann
patent: 4687189 (1987-08-01), Stoll et al.
Beben Marius
Dittrich Gerhard
Mehlert Wolfgang
Kuhnke GmbH
Watson Robert C.
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