Abrading – Frame or mount – Portable abrader
Reexamination Certificate
2000-07-27
2001-09-18
Banks, Derris H. (Department: 3723)
Abrading
Frame or mount
Portable abrader
C083S699210, C083S698110
Reexamination Certificate
active
06290586
ABSTRACT:
A variety of powered sanding tools are currently manufactured, such as belt sanders, oscillating spindle sanders, orbital sanders, detail corner sanders, disc sanders, or like. A belt sander uses a conventional closed loop abrasive belt operating in one continuous direction requiring the return direction be positioned as not to abrade any undesired surface. An oscillating spindle sander mounted in a horizontal table, or oriented drill press, uses an abrasive attached to a 0.5 inch or larger diameter shaft which, while rotating the abrasive surface, oscillates parallel to the axis of the shaft. An orbital sander provides a circular motion of a flat abrasive surface in the plane of the flat surface. A detail corner sander is hand held and uses a vibrating flat triangular surface to reach tight corners inaccessible by orbital sanders. A disc sander with a rotating motor shaft utilizes flat abrasive plates, from 4 to 6 inches or more in diameter, whose circular motion as the motor shaft rotates allows the workpiece to be guided against the flat abrasive surface.
Fine detailed sanding of curved, concave, convex, delicate surfaces, fine and narrow, and closed internal hole surfaces cannot be performed using many powered sanding tools currently manufactured. The closed loop of a belt sander does not allow internal sanding of circles, slots, or like. The spindle sander cannot sand slots and internal cut-outs narrower than 0.5 inches. For spindle and belt sanders, care must be taken not to allow the opposite side of the workpiece from the main cutting area to be damaged by unwanted abrasion. The orbital sander, corner detail sander, and disc sander do not permit sanding of concave, or easy control with convex surfaces.
BACKGROUND OF THE INVENTION
Scroll saws are widely used by amateur and professional woodworkers and are particularly useful for cutting decorative 2-dimensional figures from wood using an elongate scroll saw blade which makes small and curvateous cuts. Current scroll saw models utilize a variety of parallel arms forming C-shapes pivoting to provide vertically aligned movement of thin saw blades suspended between the ends of the arms. To cut out a section within a workpiece a hole is first drilled in the wood within a portion of the wood the blade will cut out, and the blade inserted and mounted on the scroll saw to begin the cutout. Many operators of scroll saws use small blades which provide relatively smooth cuts through wood that do not require further finishing. In many cases the operators conclude that no further finishing is required mainly because no quick and easy method for finishing and controlling the finishing has been previously available. Other users find that burn marks, rough cut edges, and other imperfections require considerable further and laborious hand finishing. These finishing requirements are especially prevalent with low cost scroll saws using pin-end blades, and are many times desired by high-end, more costly pin-less and pin-end scroll saw users. In the cutting of the intrique designs, a great deal of time is required to fasten and unfasten scroll saw blades, and consequently a rapid method of inserting and mounting a finishing tool, or abrasive, on a scroll saw is required. Unfortunately, there has been no equivalent scroll saw abrading system which is as quickly fastened and unfastened as scroll saw blades. The subject invention embodiments address these issues.
There are, commercially available, a variety of reciprocating small hand and electric oscillating and sanding tools and saws that make use of a replaceable sanding, abrading, or cutting elements such as sandpaper sheets and sandpaper belts. Some hand and mechanical sanders are comprised of clamps which secure the ends of a piece of an abrasive firmly supported against a backing. These tools range from hand held blocks to reciprocating or orbiting sanding surfaces at high speeds. Most tools are not ordinarily useful for small delicate sanding, sanding of small and unusually-shaped work pieces, or delicate sanding of very complicated internal small and narrow spaced areas. The embodiments of this invention provide a tool to facilitate work and provide better quality of sanding finishes. The advent of advanced techniques of support and belt design, durability, materials, and manufacture of the support has allowed these embodiments to take advantage of new technologies and materials. The abrading materials attached to belts, bands, strips, meshes, and abrasive members have been manufactured with metal, cloth, or other reinforced backing materials, with cutting surfaces comprised of particulate materials such as steel, metals, carbides, borides, nitrides, silicates, tungsten, or equivalent diamond substitute materials fused or adhered to the surface. These abrasive particles provide a multiplicity of cutting edges of size and shape. The backings provide substantial tensile strength which thereby increases the strength and durability of the sandpaper and permits its use without conventional support that sandpaper ordinarily requires when used without such backing.
U.S. Pat. No. 4,977,712 by Fisher, et. al., details a hand sander with abrasive member belt. The system offers a hand sander with a very narrow jaw depth. The system uses a complicated tensioning mechanism. The instrument must be purchased separately and is not an accessory tool or item. The abrasive strip cannot be mounted evenly to provide even tension using the tapered pegs, holes and recesses.
U.S. Pat. No. 3,874,126 by Catlin, et. al. details a flexible abrading tool utilizing a specially made metal or grit impregnated band with a rigid backing. The system cannot be applied to a scroll saw. The system provides limited control and narrow jaw depth for use due to the hand held saw construction, limited tensioning, and cannot be carefully controlled with respect to band angles and depth. The tool does not leave the operator's hands free for precise manipulation of workpiece movement. The abrading tool is expensive to manufacture, replace, and is not disposable. The hardened steel structure produces grooves on materials and cannot contour to surfaces. The blade mounts only in hand held narrow C-shaped saws, and the brackets can only clamp and hold the abrasive blade if the blade is made of metal. The tool is specifically built and comparatively expensive.
U.S. Pat. No. 4,802,310 by Holmes details an elastic backing to hold an inelastic abrasive sheet which delaminates easily from the adhering surface junction. The contact adhesive cannot withstand the multiple releasing and re-adhering processes. The jaw depth is limited and the elastic cannot provide controlled pressure of the abrasive sheet to the working surface. Uniform band tensioning is difficult to control.
A number of scroll saw clamps for holding pin and plain pin-less end scroll saw blades have been designed to facilitate use and rapid replacement of various saw blades. In general, a sabre saw can be designated as a power tool where one end of a saw blade is fixed in a mounting. A reciprocating saw can be designated as a tool where two symmetrically disposed ends are fixed in a mounting. A scroll saw is a power tool whereby the reciprocating action is augmented by a power tool motor component. Representative scroll saw blade holders are found in U.S. Pat. Nos. 5,351,590 by Evert, et. al., 5,272,948 by Theising, 5,105,704 by Chang, 5,058,280 by Pollak, 5,016,512 by Huang, 4,953,431 by Chen, 4,841,823 by Brundage, and 4,838,138 by Rice, et. al., 4,807,507 by Rice, et. al., and 4,670,986 by Chen. All have small narrow clamping surfaces as a necessary requirement for the suspension of the blade in reciprocating saw. All address the pivoting movement required to maintain the movement of the blade for a straight vertical cut. All scroll saw clamp designs have the pivot point parallel to the oscillating axis of the scroll saw and allow the blades to be mounted in one orientation as a necessary and sufficient requirement of all designs. All clamps securing pin-less scroll
Banks Derris H.
Skjerven Morrill & MacPherson LLP
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