Metal deforming – With tool carrier – With guide for rectilinearly moving tool
Reexamination Certificate
1999-11-23
2001-05-15
Jones, David (Department: 3725)
Metal deforming
With tool carrier
With guide for rectilinearly moving tool
C072S409160, C072S416000, C072S453160, C030S228000, C083S635000
Reexamination Certificate
active
06230542
ABSTRACT:
BACKGROUND
The invention relates first of all to a hydraulic apparatus, for example for pressing or cutting workpieces, with a mounting head for tools which can be moved against one another.
An apparatus of this kind is known, for example, from German Patent Application 198 25 160, which corresponds to U.S. application Ser. No. 09/319,908, Aug. 10, 1999. The content of this patent application is hereby incorporated as to its full content into the disclosure of the present invention.
With regard to the prior art described above, one technical problem for the invention is seen in improving the construction of a hydraulic apparatus of the type under discussion, particularly as regards its technical functioning.
SUMMARY
This problem is solved first and foremost by the fact that the tools can be arranged in the mounting head in a manner laterally offset from one another in order, in the case of cutting tools, to allow them to move past one another. As a result of this configuration, there is provided increased utility value for the hydraulic apparatus, especially when using cutting tools. In the case of a cutting operation, a movable cutting tool is displaced at least until its cutting edge moves behind the cutting edge associated with the fixed tool. This makes it possible to cut workpieces, such as solid or hollow sectional bars, to length cleanly and without burrs. The fact that the cutting tools can be moved past one another leads to a shearing division of the workpiece. The laterally offset arrangement of the tools relative to one another in the mounting head is furthermore also conceivable in the case of tools for pressing workpieces. The arrangement chosen also makes it possible to insert in the mounting head tools for other non-cutting operations on workpieces, bending tools for example. In a first embodiment, the tools are guided in grooves formed next to one another. In this regard, it is possible for a groove to be associated with each tool. However, it is furthermore also conceivable, given the formation of two grooves arranged next to one another, to associate these two tools in such a way that they are guided in common grooves formed beside one another. As a further embodiment of the subject matter of the invention, it is provided that the tools are guided in a common groove with additional support on opposite outer surfaces of groove walls. Irrespective of the number of grooves, they run in the direction of displacement of the tool or tools in the mounting head. Where the tools are arranged in a common groove, each tool preferably also engages over the associated groove wall bounding the groove to provide additional support against the outer surface of the groove wall. Metaphorically speaking, the construction is chosen in such a way that the workpiece, the groove and the groove wall of the mounting head forms a guide rail for the tool in the form of a tongue. Provision is furthermore made for grooves or guide structures for the tools to extend in the direction of displacement and to be provided on both sides of the tools, in order to provide tilt-free guidance of the tools. Where the tools are arranged in a common groove, the tool section sliding in the groove preferably corresponds to no more than half the width of the groove, so that both tools may be moved fully past one another. In another embodiment, it may be provided that the tools are guided in a common groove and interpenetrate one another. Accordingly, the tools are shaped in such a way that in particular the operative regions of the tools, for example the cutting edges of cutting tools, can enter into the region of the other tool. Thus, for example, provision is made for the tools to have guiding sections in the form of tongues for guidance in the common groove only in the end regions which are directed away from each other. These guiding sections extend over the entire width of the groove, whereas the actual operative region preferably corresponds to half the width of the groove, to allow the operative regions of the tools to move past one another. In an advantageous development of the subject matter of the invention, it is provided that the mounting head is formed as a closable rectangular guide. In this way, on the one hand, insertion of the various tools is facilitated, and, on the other hand, by means of the opened rectangular guide, the apparatus can be placed against the workpiece to be pressed or cut. This is of advantage, particularly in the case of very long workpieces or those in locations to which it is difficult to gain access. After it has been placed against them, the mounting head formed as a rectangular guide is closed, after which, as a further feature of the subject matter of the invention, the displaceable tool is acted upon in the rearward direction by a ram which can be actuated by means of the hydraulic apparatus. After the rectangular guide is closed, the direction of displacement of the movable tool runs in extension of the direction of displacement of the ram. The movement concerned is preferably a linear displacement of the ram and of the displaceable tool towards a fixed tool. Where the mounting head is formed as a rectangular guide, the longer side of the rectangle is aligned in the direction of displacement, at least in the closed position of the mounting head. A quadratic shape of the mounting head when viewed transversely to the direction of displacement of the tools is furthermore also conceivable. It is also possible to conceive of arrangements of the mounting head in which the displacement of the tools is effected in a nonlinear manner, for example in the form of a cam-guided displacement. In the preferred configuration of the mounting head as a rectangular guide, provision is made for the rectangular guide to be of three-piece construction, one piece being provided as an angled piece which encloses one longitudinal side, one piece being provided as a narrow-side piece and one piece being provided as a longitudinal-side piece. In this regard, it is furthermore preferred for the narrow-side piece to provide joints at each of its ends for the angled piece and for the longitudinal-side piece. It is proposed here that the narrow-side piece be provided in the region that can be associated with the apparatus. The narrow-side piece can furthermore be provided in the form of two lug-like plates which enclose end regions of the angled piece and of the longitudinal-side piece between them, the ram which can be moved by the hydraulic apparatus entering the guide space of the mounting head in the intermediate space provided between these plates. As a development of the subject matter of the invention, provision is made for the angled piece to provide a portion of a longitudinal side which overlaps with the longitudinal-side piece. As a consequence of this, the angled piece is formed to be substantially U-shaped in a side view transverse to the direction of displacement, with one U limb forming a longitudinal side which is arranged to be shorter than the other U limb, the free end of the other U-limb being provided with a bearing feature to allow pivoting displacement of the angled piece in the region of the narrow-side piece. In the closed position of the mounting head or rectangular guide, the shorter U limb coincides with the longitudinal-side piece, which is likewise mounted in a pivoting manner on the narrow-side piece, this position preferably furthermore being secured by positive locking. Thus, for example, one longitudinal side of the angled piece can have an upper projection which is provided with an undercut and enters into a correspondingly formed groove in the longitudinal-side piece. The pieces—angled piece and longitudinal-side piece—which are subject to spring-loading in the opening direction, are held in the closed position by the selected undercut. This position can only be released by deliberate action. To fix the tools in the mounting head, securing means for securing a tool in the mounting head are provided, in each case opposite one another, on the narrow-side p
Gustav Klauke GmbH
Jones David
Trexler, Bushnell Giangiorgi, Blackstone & Marr, Ltd.
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