Abrading – Attachment
Reexamination Certificate
1998-05-20
2001-08-28
Hail, III, Joseph J. (Department: 3723)
Abrading
Attachment
C451S426000, C451S550000, C451S359000, C451S549000
Reexamination Certificate
active
06280309
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention relates to the field of disc-shaped cutting or abrading, rotating tools of the type having manufactured cutting or abrading surfaces, which tools may be used for shaping and forming materials, and in particular this invention relates to accessories for angle grinders which are adapted for use with a hand-held angle grinder and to cutting or abrading attachments for such a grinder.
BACKGROUND
A number of applications in the construction or repair of solid articles involve the selective removal of material from a bulk in order to produce a desired conformation or shape. For example a builder may remove some wood from a beam in order to produce a neat fit—more likely if the house being built is non-rectangular; a foundry removes surplus metal from sprues or joints between mould parts when producing a casting; a wood carver selectively removes wood in order to produce a carving a panel beater frequently removes surplus plastic filler which was placed within a defect in an automotive panel to build it tip, so that the outline conforms with the original outline of the panel; or a boat builder may have to remove kilograms of material, such as lead-filled fibreglass when shaping or repairing a hull.
In a previous Application published as WO 95/29788 on Nov. 9, 1995, Applicant described an invention in which a first aspect comprised an accessory for a grinder including a rotatable tool having a shape substantially that of a disk, having an axis of rotation and capable of being mounted on an arbor of an angle grinder, characterised in that the rotatable tool is provided with a working zone extending inwardly from the perimeter of the tool; and rest means extending substantially inwardly from the working zone of the tool, which rest means is displaced from the working zone along the line of the axis of rotation.
For clarity it should be understood that the term “working zone” refers to the permitted location on the tool where cutting or abrading means might be located. The “working surface” of the tool refers to those parts of the working zone where cutting or abrading means are actually located.
In a preferred aspect of the previous Aplication the rest means is concentric with and supported on the rotatable tool, and most preferably comprises a portion of a convex surface
In an alternative embodiment the previous Application comprises an accessory for a grinder characterised in that the rest means comprises a fixed rubbing surface or nose supported on the angle grinder and displaced so as to be supported beyond the rotatable tool. (By “beyond” we mean beyond the end of the arbor, or below the tool as it is normally held).
In a further preferred aspect the previous Application comprises a rotatable disk-shaped accessory for a grinder having a working zone and a rest means, characterised in that the working zone extends inwardly over the surface of the disk from the perimeter over from about a first third to about two thirds of the radius.
Other preferred featured of the previous Application include providing that: the working surface of the rotatable tool with at least one cutting tooth; each cutting tooth has at least one cutting edge lying in a plane substantially coplanar with the radially adjacent surface of the tool; and each cutting tooth projects from the radially adjacent surface of the tool by a height of up to 3 percent of the diameter, so that the depth of cut of each tooth is limited. Each cutting tooth can be additionally provided with a tooth rubbing surface or gauge surface; the rubbing surface projecting outwardly at least as far as the cutting zone of the tooth, thereby limiting the depth of cut of each tooth.
The accessories of the present invention are distinguished from those described in UK Patent Application 2 207 626 which teaches a metallic abrading disk with a recessed central portion and U.S. Pat. No. 4,835,912 which provides a species of flap disk with a rotatable central disk and, attached around and projecting beyond the periphery thereof, a plurality of sandpaper loops providing the abrasive element of the tool.
STATEMENT OF THE INVENTION
The present invention provides a further extension of the general concepts embodied in the previous Application described above. In one aspect the invention comprises an accessory for a grinder comprising a rotatable disk-shaped tool having a rest zone and a working zone said working zone being located at the outer perimeter of the disk and being adapted to releasably receive and retain an annular attachment having an attachment surface and a working surface provided with shaping means. Preferably the accessory has the main characteristics of the invention described in the previous Application with the difference that the working surface is provided by the annular attachment adapted to be releasably attached to the tool in the region of its working zone adjacent the outer perimeter rather than by the disk surface itself.
The attachment means by which the annular attachment may be attached to the disk-shaped tool can be any convenient means. These may include for example a stud and slot arrangement in which a series of studs formed on the back surface of the attachment, (that is the surface not bearing cutting or abrading means), and having enlarged heads are fitted into cooperating arcuate slots in the surface of the rotatable disk having enlargements at one end that are just sufficient to accomodate the enlarged heads of the studs. Rotation of the annular attachment in the direction of rotation of the disk when in use then moves the studs within the slots such that the heads are located at the non-enlarged ends of the slots and are not disengageable from the slots without reversing the rotation. Alternatively the attachment can be secured using projecting tabs adapted to fit into cooperating slots in the disk and be bent around to engage the disk and prevent diengagement until the tabs are straightened. Other similar attachment devices include spring fit attachments anchored around the edge of the disk, circlips and other similar mechanical devices that will be readily be devised by the man of ordinary skill in the art. Several examples are illustrated in FIGS. 27 and 28.
The shaping means are located on the opposed surface of the disk to the attachment means and generally comprise cutting or abrading means. The cutting means are generally cutting edges (teeth), and the abrading means is understood to include means capable of removing material from the surface by an action that does not involve removal using a cuttin action. This would include surfaces comprising a layer of abrasive grit, hardened stubby projections, knurled or ridged surfaces, bristles and the like.
Consistent with the provision of the working surface in the form of the surface of an annular attachment to the rotatable disk-shaped tool rather than on the tool itself, the preferred features and aspects of the previous invention referred to above are also preferred features of the present invention.
Shape of the Annular Attachment
The invention also provides an annular shaping attachment for a rotatable disk-shaped tool having at least one set of coupling means adapted for reversibly attaching the annular attachment to the rotary tool. The preferred annular attachment comprises a working surface and an attachment surface with the working surface having shaping means located thereon and the attachment surface comprising means by which the annular attachment can be releasably attached to a substrate, particularly one in the form of a disk-shaped rotatable tool.
In a preferred form the annular attachment has the shape of a truncated cone in which the interior surface carries the attachment means and conforms to the curvature of the surface of the outer peripheral portion of a convex disk-shaped tool to which it is intended to be affixed. Thus the plane of the inner edge of the annular attachment is preferably displaced from the plane of the outer edge of the attachment along the axis of the tool and away from th
Bennett David
Hail III Joseph J.
Norton Company
Wilson Lee
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