Adjustable abrading tool
a technology of rotating tools and abrading sleeves, which is applied in the field of rotating tools, can solve the problems of uncontrollable and non-uniform diameter of the bore to be abrading, inability to insert the inflated sleeves into the bore, and inability to maintain uniformity
Inactive Publication Date: 2006-07-06
DEWARE WILLIAM R
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AI Technical Summary
Benefits of technology
The tool provides uniform diameter control, versatility in handling different hole sizes, effective abrading of deep and delicate surfaces, and compatibility with portable drills, while being cost-effective and easy to maintain.
Problems solved by technology
Although this inflatable sleeve successfully abrades the inner walls of the bore, this system has a number of serious drawbacks.
First, the diameter of the bore to be abraded is both uncontrollable and non-uniform.
Because of the sleeve is necessarily made of a relatively pliable elastomeric material, the sleeve it does not maintain a uniform diameter and tends both to flare out the exposed ends of the bore and under-abrade areas within the bore.
Second, an inflated sleeve cannot be inserted into the bore and, therefore, the tool is not readily adapted for abrading chamfers or anything less than an entire bore.
Finally, the sleeve and tool system are relatively expensive.
The tool requires a source of compressed air proximate to the workpiece to be abraded, requiring a significant upfront investment.
Further, the inflatable sleeve requires laborious fabrication due to the process of attaching the abrading material.
This burdensome process guarantees a high price for a tool that must be discarded after use.
While this invention allows a tool to be inflated to various sizes and to chamfer, its lack of uniformity creates a serious drawback.
Furthermore, this tool hardly stands alone; it requires an air mandrel to expand the sleeve in order to abrade.
Although this tool expands to grind and polish a hole, any expansion is unmeasurable.
This tool could not effectively be used in conjunction with a portable drill.
Although this tool is certainly cost-effective, using sandpaper and no external tools, it potency is highly suspect.
Second, as a cylinder this tool is incapable of chamfering.
This tool could not effectively be used in conjunction with a portable drill.
Although this grinding device allows cost-effective and simple replacements due to the use of conventional sand paper, the ability to control the diameter to an easily measurable degree is still absent.
While this tool expands without use of a hand tool or mandrel, all the elaborate intricacies involved in the expansion ensure a hefty tool price.
Also, this tool could not effectively be used in conjunction with a portable drill.
Although this tool's diameter expands or contracts by rotating a member located on its top, instead of using a pressurized medium, this expanded / contracted diameter is not measurable by the tool.
This expensive material combined with the fact that it is permanently attached to the tool, makes the tool's reusability impractical.
This tool could not effectively be used in conjunction with a portable drill.
Furthermore, this cylindrical tool is incapable of chamfering.
Although this grinding device allows cost-effective and simple replacements due to the use of conventional sand paper, the ability to control the diameter to an easily measurable degree is still absent.
While this tool expands without use of a hand tool, the elaborate expansion devices ensure a hefty tool price.
This tool could not effectively be used in conjunction with a portable drill.
Furthermore, due to its cylindrical shape, this tool is incapable of chamfering.
Any adjustments, which are minute, are neither readily measurable nor designed to allow an operator to work with holes of differing sizes.
This measurement purely exists to check accuracy, not to allow a machinist with the same tool to finish another differently sized hole.
This tool could not effectively be used in conjunction with a portable drill.
Furthermore, the abrasion is a part of the tool, requiring that the entire tool be discarded after significant abrasion-wear.
Although this invention allows a machinist to replace the abrasives instead of the entire tool; the tool is overly complicated and replacing the abrasives is inconvenient.
This tool could not effectively be used in conjunction with a portable drill.
This attribute is designed to only prevent wear and in no way accurately expands or contracts the grinding diameter.
This tool could not effectively be used in conjunction with a portable drill.
Although this tool uses inexpensive, although specialized, sandpaper as an abrasive means, the method of expansion is entirely impractical.
During honing these small strips are not in sufficient contact with a support surface to effectively abrade.
Using centrifugal force to expand an abrasive against an interior surface of a hole will frequently be inadequate.
Also, these individual strands of sandpaper are more delicate than many jobs will require.
While this type of sandpaper fits into a tube, it is wholly inadequate to expand or chamfer a hole.
This paper is also restricted in the types of materials and shapes that it may sand, as the exposed edges on the front sheet of the star tend to catch On most non-uniform surfaces causing the edges to bend against the direction of radial motion exposing the non-abrading rear surface of the sandpaper to a workpiece.
In addition, the use of multiple sheets of sandpaper makes these stars relatively stiff and unsuited to freely conform to the inside surfaces of bores.
Method used
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Embodiment Construction
[0071] Referring first to FIG. 1, one embodiment of the abrading tool 10 of the present invention is shown. In its most basic form, the abrading tool 10 includes a threaded drive rod 14, a means 12 for retaining an abrasive material (not shown) about the threaded drive rod 14, an expandable support 16 disposed about the threaded drive rod 14 and dimensioned to brace the abrasive material, and a means 18 for expanding the expandable support 16.
[0072] The threaded rod 14 is preferably manufactured of metal and has a fine pitch thread to allow fine adjustment of the diameter of the expandable support 16. In the embodiment of FIG. 1, the threaded rod 14 has threads along its entire length and, therefore, is adapted to be secured into a female threaded coupling (not shown) that attaches to a source of rotation. However, in other embodiments, the threaded rod 14 is only threaded at the end in which the means 12 for retaining an abrasive material and the expandable support 16 are disposed...
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An abrading tool, abrasive star and abrading kit, in which the abrading kit includes the abrasive star and the abrading tool. The abrading tool includes a threaded drive rod, a means for retaining an abrasive material about the threaded drive rod, an expandable support disposed about the threaded drive rod and dimensioned to brace the abrasive material, and a means for expanding the expandable support to adjust the diameter of the outer surface of the abrasive material. The abrasive star is a sheet having an outer edge and an opening to allow it to be retained upon the drive rod. A plurality of gaps is provided through the sheet allowing it to be folded into a roughly conical shape having a continuous outer surface.
Description
RELATED APPLICATIONS [0001] This application is a divisional application claiming the benefit of co-pending U.S. patent application Ser. No. 10 / 385,789, filed on Mar. 11, 2003, which is a continuation in part of U.S. patent application Ser. No. 10 / 252,077, filed on Sep. 20, 2002, now abandond.FIELD OF THE INVENTION [0002] The present invention relates to the field of rotating tools and, in particular, to a tool and kit for abrading holes, bores, chamfers and the like. BACKGROUND OF THE INVENTION [0003] It is common practice in the machine tool industry to use abrading tools to finish the walls (e.g., removing about 0.001 to 0.005 inches of material) of a previously provided hole or similar interior surface of a workpiece. Abrading operations generally correct inaccuracies in straightness and roundness in bore holes, can provide a uniform hole surfaces, or can remove burrs or finish surfaces. [0004] A number of abrading devices have been developed to abrade, finish, polish or grind w...
Claims
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IPC IPC(8): B24B9/02B24B5/48B24B33/08B24D9/02
CPCB24B5/48B24B33/089B24D9/02
InventorDEWARE, WILLIAM R.
OwnerDEWARE WILLIAM R