Metal deforming – By use of tool acting during relative rotation between tool... – Tool orbiting or rotating about an axis
Reexamination Certificate
1999-11-26
2001-10-30
Bishop, Steven C. (Department: 3722)
Metal deforming
By use of tool acting during relative rotation between tool...
Tool orbiting or rotating about an axis
C472S117000
Reexamination Certificate
active
06308548
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a deburring apparatus, and to the method of deburring. In it's more specific aspect, this invention relates to an apparatus for deburring the cut or marginal edges of cylindrical bodies, such as metal tubes (e.g., steel tubes) or the like, and to the method of accomplishing this deburring operation.
FIELD OF THE INVENTION
Cylindrical metal bodies, such as metal tubing, typically formed by seam welding, extrusion or other suitable forming means, is cut by a suitable tool or knife to the desired length depending upon the end use application. The cutting tool produces a rough, ragged or jagged edge on the tube, that is, burrs are formed along the cut edges or marginal edges of the metal tube or workpiece, which can interfere with or jeopardize the performance of the cylindrical metal body, and can result in poor joints between connecting tubes. Also, the burrs can be hazardous to the worker. Numerous devices have been developed for removing the burrs from the cut edges, including rotary milling heads, rollers, stationary scraping blades, and hand files or other such abrasive devices. The devices known in the art are either complicated, or not altogether successful in providing a smooth, deburred edge. Furthermore, and most significantly, known deburring tools have been known to deform the metal workpiece.
A number of tubular work pieces are formed by seam welding, and it is usually necessary to deburr the marginal edges of the tube. Most known deburring tools can catch on the weld seam, thereby inhibiting a proper or complete finishing. Moreover, if the deburring tool is rotated at a relatively high speed, the tool can grab the work piece and spin it out of control or even throw the work piece free of the worker, and is therefore hazardous. In addition, a metal tube usually has irregularities, most notably being out-of round (not a perfect circle), which also inhibits the deburring operation or makes it impossible to perform.
In addition, most deburring apparatus that are known or available are capable of deburring one side only of the edge, i.e., the inside edge or the outside edge. Consequently, the operation either must be done in two steps, or one side only is deburred and the other side remains unfinished.
This invention has therefore as its purpose to provide a deburring apparatus which is easy to operate, and deburrs the cut edge or marginal edge of a cylindrical metal body or workpiece.
It is another object of the invention to provide a deburring apparatus which can deburr a metal workpiece having irregularities, including a workpiece that is out-of-round, and that has a weld seam.
It is another object of the invention to provide a deburring apparatus which produces a smooth or deburred edge on a cylindrical metal body or workpiece, and does not deform the workpiece.
Still another object of the invention is to provide a deburring apparatus which can deburr an angled cut in the marginal edge of the work piece.
Yet another object of the invention is to provide a deburring apparatus which is capable of deburring concomitantly both sides of an edge of the workpiece.
It is another object of the invention to provide a method for deburring the cut edge or marginal edge of a tubular or cylindrical metal body or workpiece utilizing the apparatus of the invention in stepped sequence.
SUMMARY OF THE INVENTION
In accordance with the present invention, the apparatus for deburring the cut or marginal edge of a substantially cylindrical metal body or workpiece, such as a metal tube or the like, comprises a substantially enclosed, cylindrical housing, adaptable for rotatable mounting. The cylindrical housing includes a cap or top section, and a bottom section having a substantially planar, exterior, bottom face or surface which is about normal to the cylindrical wall, and an open continuous channel. The two sections desirably are of equal diameter, and when joined or connected form a cylindrical housing of a substantially uniform circular dimension. The housing desirably includes appropriate means, such as a spindle or shaft extending outwardly from the cap or top section of the housing for insertion into the chuck of a machine, for rotating the housing.
The term “substantially enclosed cylindrical housing” as used herein and in the appended claims is intended to include or describe a housing that may have one or more openings or apertures in the facing or wall or walls of the housing to allow for venting of heat build-up and to facilitate cleaning of the apparatus.
The metal workpiece can be any of the several metals used in the fabrication of tubular bodies. These metals include, for example, steel, steel alloys, stainless steel, aluminum and brass.
It should be understood that such terms as “longitudinal”, “radial”, “axial”, “transverse”, “normal”, and “perpendicular” are used herein and in the appended claims in reference to the center longitudinal axis of the housing, unless otherwise noted.
In accordance with the our invention, the bottom section has first and second opposed, substantially parallel surfaces. The first or exterior surface or face, which is the exterior face includes (i) a central hub, (ii) a first, continuous, open channel circumscribing the hub, and (iii) a circumferential rim extending from the channel to the perimeter of the cylindrical wall. This first channel, which opens outwardly from the exterior face of the bottom section, comprises spaced side walls, thereby forming an inner side wall, defining the outer periphery of the hub, and an outer side wall, defining the inner periphery of the rim. The channel terminates at the second or interior face of the bottom section forming a land or boss integral with the side walls, and thereby interconnecting the hub and rim.
The second or interior surface of the bottom section includes an axial center cavity or recess having a defined inner surface. The land or boss circumscribes the center cavity and terminates at its outside circumference at the outer wall of the channel. A second continuous channel or recess, opening to the interior of the bottom section, circumscribes the land.
A plurality of spaced, first and second slots extend transversely through the land and open to the first channel longitudinally along the periphery of the inner wall and outer wall of the first channel, respectively, and provide an appropriate seat for pins arranged or inserted in each slot. As viewed from the interior face of the bottom section, the first elongated slots open onto the center cavity, and the second elongated slots open onto the second channel. The first and second slots are offset and each lie on common circles which are concentric. As a result, each of the first slots is disposed adjacent a pair of second slots, and vice-versa, thereby defining a zigzag pattern such that it is equi-distance between each first and second pin.
The apparatus of our invention further includes a plurality of first spaced apart pins freely seated in the first elongated slots, that is, disposed on a common circle about the longitudinal axis as the center. A portion of each pin protrudes through the slot of the inner wall of the first channel and outwardly therefrom and into the first channel, as viewed from the bottom. A seat or ledge formed at about the periphery of the hub accommodates or provides a suitable seat for each pin. Similarly, a plurality of second spaced apart pins are freely seated in the second elongated slots and disposed concentric to and outwardly from the first pins and offset therewith, so that a portion of each second pin protrudes from the slot in the outer wall and outwardly therefrom and into the first channel and between adjacent first pins, as viewed from below. Thus, as a result of this disposition of the pins, a portion of the longitudinal surface of each of the first and second pins protrudes in opposed directions from the opposite channel walls.
Each of the first and second pins have a substantially cylindrical section and a substantially convex terminus, as v
Petrack David J.
Schwochert John P.
Bishop Steven C.
Peters R. Jonathan
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