Work holders – Relatively movable jaws – Jaw features
Patent
1994-07-25
1996-09-03
Watson, Robert C.
Work holders
Relatively movable jaws
Jaw features
B25B 124
Patent
active
055516777
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a profiled clamping jaw for a clamping device comprising a base body and a clamping surface arranged on the base body and adapted to the surface contour of a workpiece, and a process for clamping of workpieces by means of a profiled clamping jaw of the above type.
Clamping jaws are parts of clamping devices, as they, for example, are needed in vises, machine tools or machining centers for holding of workpieces. To clamp profiled rods in particular for the window, door or facade-wall construction, profiled clamping jaws have been used up to now which, in their surface contour, are adapted to the contour of the workpiece to be clamped. Thus, a special profiled clamping jaw is created for each workpiece type, which jaw must be exchanged in the case of a change of the workpiece to be worked in the respective clamping device. The known profiled clamping jaws can therefore because of the long change-over times only be economically utilized in the series production for medium or larger lots of at least 200 pieces, not, however, in the individual or small-series production. This is particularly true for use in large series boring and milling machines, in which a plurality of clamping devices with profiled clamping jaws are being utilized.
Based on this, the basic purpose of the invention is to develop a profiled clamping jaw and a process for clamping of workpieces, with which in a simple manner an adapting to different workpiece contours is possible.
To attain this purpose the characteristic combinations disclosed in claims 1 or 20 are suggested. Further advantageous developments and further embodiments of the invention result from the dependent claims.
The basic principle of the inventive solution is that the clamping surface can be shaped by moving the base body toward the workpiece until reaching a clamping position and can thereby be automatically adapted to the contour of the workpiece surface. This principle can advantageously be realized such that the clamping surface is composed of a plurality of pressure pieces which are movable relative to the base body independently from one another and can be locked on same in a clamping position. The pressure pieces are thereby advantageously movable back and forth in clamping direction of the profiled clamping jaw on the base body and can be locked together on the base body.
An advantageous development of the invention provides that the pressure pieces are movable against the force of a spring in direction of the base body so that they can be moved against the spring force in direction of the base body during movement of the base body toward the workpiece to be clamped under the action of the workpiece surface and can be locked in the clamping position.
A further advantageous development of the invention provides that each pressure piece is guided with a clamping ram in a sliding guide of the base body. The path of movement of the clamping ram is defined in clamping direction advantageously by a front end stop defining the initial position of the pressure pieces and can be locked in every position by means of a blocking member on the base body. The blocking members of the clamping rams can thereby be operated advantageously together mechanically, pneumatically or hydraulically. To operate the blocking members, switching members are advantageously provided which, during movement of the clamping rams, can be advantageously released in the vicinity of their rearward end position.
The blocking members are constructed, for example, as a forming or expanding element which can be operated through a pressure piston movable relative to the clamping ram and can be clamped between the clamping ram and a cylinder wall of the base body, and are thereby in particular constructed as a clamping sleeve, an annular clamping disk or annular forming spring. It is basically also possible to design the blocking members as a clamping block arranged between the base body and clamping ram.
In order to avoid damage to the workpiece surface, the pressure
REFERENCES:
patent: 2399824 (1946-05-01), Pressman
patent: 3211445 (1965-10-01), Rossman
patent: 5407185 (1995-04-01), Zehnpfennig et al.
Abraham Peter
Puettmer Hermann
Goetz GmbH Metall- und Anlagenbau
Watson Robert C.
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