Abrading – Carrier for relatively movable simultaneously usable tools – For radially movable tools
Reexamination Certificate
1999-03-05
2001-07-03
Rose, Robert A. (Department: 3723)
Abrading
Carrier for relatively movable simultaneously usable tools
For radially movable tools
C451S485000, C451S506000
Reexamination Certificate
active
06254467
ABSTRACT:
This invention refers to a device for deburring workpieces, in particular moulded parts and castings made of plastics, rubber or the like, said device comprising a rotatable shank and linear tool elements which, in the axial direction, extend coaxially to the shank axis, are secured relative to the shank, and as the latter rotates, can bulge out radially under the effect of centrifugal forces.
Deburring devices with rigid cutting edges are known by means of which the burrs can be removed from moulded parts. Such tools are pressed against the workpiece to be processed with an adjustable force. In practice the problem arises that the burrs can only partly be removed or that while deburring it happens that not only the burr itself is removed, but that the tool also cuts into the surface of the workpiece.
Moreover, rotating tools formed as deburring brushes are known the bristles of which are made from metal and are clamped in such a manner that in operation their shape will not or practically not change. When deburring parts made of plastics or rubber, there is the danger that the surface of the workpiece also is subject to damage because the material the workpiece is made of is by far softer than that of the worktool so that the worktool when acting upon the surface of the workpiece will remove material from the workpiece.
Furthermore, from DE 44 45 592 A1 rotating tools are known which use a continuous rope of metal threads the ends of which are connected with each other, and which in a peripheral direction or alternatively concentrically to the rotational axis of the tool is provided with a plurality of coaxial sections which form the outer periphery of the tool. The rotating metal portion is twisted around a support, and the individual sections of the wire rope are fastened to the supports in such a manner that they are flexible in radial direction so that in view of the centrifugal force they bend or bulge outwardly when being rotated and exert an elastic pressure against the surface of the tool. This type of tool causes problems in practice because when treating complicated contours the metal rope dependent on the type of material and shape of the tool attacks and damages the surface of the workpiece because the life of the tools in view of the friction of the rope against the supports and the guide rollers for the rope are extremeley short so that the metal rope is to be exchanged rather often and accordingly an automatic operation procedure is to be interrupted, and because in view of the necessity for lubricating the support the lubricating particles carried along by the rope are intolerable on the workpiece and are to be avoided.
It is an object of this invention to provide a rotating device according to the introductory part of claim
1
in such a manner that the tool is able to handle also complicated shapes of contours and burrs on the surfaces of workpieces without any problems, that the tool is of simple structure and that it has a long life.
According to this invention this object is solved by a device which is designed such that an upper and a lower carrier are secured on the shank, that the tool elements consist of individual threads or bundles of threads, the ends of which are fastened with the upper and lower carriers, and that a spring arrangement is provided concentrically with the shank between the upper and the lower carriers. Such device can be operated in connection with a motor driven manual device, f.e. a drilling machine, however, it can also be attached to a roboter head, which in a programmable manner automatically deburs the workpiece to be processed.
The tool elements comprising individual threads, cords or the like, or bundles thereof, preferably are filaments which are fastened individually or in bundles at the upper and at the lower support. Preferably the ends of the threads resp. filaments are clamped to the supports. With a preferred embodiment of the invention the ends of the threads resp. filaments are clamped between the support body and a lid-type closure overlapping the support so that by putting the lid on under pressure the entirety of the ends of the threads or filaments will be fastened.
With a revised embodiment of the invention the upper and the lower supports on their peripheral surface are provided with extensions directed radially outwardly, which extensions are formed in such a manner that they receive the threads or thread bundles. Said extensions can be screw bolts screwed into the peripheral surface of the supports end said screw bolts are provided with peripheral grooves, screw heads or the like on their outer end, which receive the threads or thread bundles. The threads can be continuously guided around the receiving grooves as endless threads or in loops, they can be thread rings tensioned between the upper and the lower support, or the like. In order to hold or clamp the threads or thread bundles within the supports of the carriers a lid-like closure each is put on top of the upper and the lower support so that the free rim of the lid is provided with elements being clamped by means of the pressure of the lid onto the support, and so that the threads cannot change their position at the supports during the process. Said elements for example are O-ring gaskets. Also with this embodiment a spring system is provided in order to bias the supports against each other.
With the device according to the invention the tool elements, namely threads and filaments, such as cords made from plastics or metal threads, can be exchanged in an extremely simple and useful manner, because the ends of the individual threads or filaments simply need to be clamped on and off, or are to be inserted as a unit together with the upper and lower supports and are fastened by means of the lid-type upper and lower closings. The length of the threads or filaments is chosen longer than the distance between the upper and the lower support so that the threads or filaments in their central area are curved outwardly, when rotated. The extent of curvature can be adjusted according to the requirements of the practical use and dependent on the requirements of the deburring operation in connection with the materials of the workpiece, or alternatively can be adjusted automatically by the rotation of the tool. This is obtained by inserting spring means, such as a coil spring between the upper and the lower support, which spring means is formed as a pressure spring determining in the inactive position a maximum distance between the upper and the lower support, however, when rotating the system in view of the centrifugal force the threads or filaments are urged outwardly in a radial direction so that the movable clamping means, for example at the lower support, tends to shorten the distance between the upper and the lower support and compresses the coil spring so that the extent of the curvature is dependent on the number of rotations per time unit.
The device according to the invention operates in a very simple and effective manner, is economical, allows an extremely smooth and careful machining of the workpiece, high life of the tool elements and an adaption to different deburring problems or alternatively to moulded parts made of plastics or rubber which are to be deburred. The said device is especially useful for automatic deburring processes at roboter stations. Tool and workpiece are adjustable relative to each other.
REFERENCES:
patent: 573734 (1896-12-01), Webster
patent: 2938309 (1960-05-01), Pollet
patent: 3076254 (1963-02-01), Ricci
patent: 5297905 (1994-03-01), Schmidt et al.
patent: 43 10 831 A1 (1993-04-01), None
patent: 44 45 592 A1 (1994-12-01), None
patent: 741317 (1933-02-01), None
patent: 1426813 (1987-03-01), None
Hoffman Wasson & Gitler
Rose Robert A.
LandOfFree
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