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Патент USA US3019580

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Feb. 6, 1962
D. .1. OLTON
Filed May 2, 1960
Dirck .I. Qlton, Loudonville, N.Y., assignor to Norton
Company, Troy, N.Y., a corporation of Massachusetts
Filed May 2, 1960, Ser. No. 25,949
1 Claim. (Cl. 51—195)
The present invention relates in general to abrading
devices and more particularly to a device ‘for holding
coated abrasive discs or the like properly centered on a 10
back-up plate of an abrading device.
The conventional method of using coated abrasive discs
Fatentecl Feb. 6, 1962
a portion thereof extending above the plane of the work
ing surfaces of the pad, to cooperate with an opening in
the surface of the coated abrasive disc adapted to be
mounted upon such pad so as to ?x the position of such
disc upon the pad and to aid in retaining the disc in the
position so ?xed.
Referring now to FIGURE 1 of the drawings, 10 desig
nates the housing of a power sander having a mounting
spindle 11 thereon. Mounted on the spindle 11 is a rela
tively ?exible back-up pad (hidden by the superimposed
coated abrasive disc) and a coated abrasive disc 12 of a
non-circular con?guration. The disc 12 is held to the
back-up pad by a retaining washer 13 and a central re
taining nut 14 threaded upon spindle 11.
centrally located holding devices.
Projecting through apertures in the disc 12 are locating
Recently there have been developed coated abrasive
15 which are ?xedly secured to the pad. These
discs of a non-circular or at least irregular con?guration.
are preferably formed of rubber and may be
These discs are generally used with a back-up pad which
circular, rectangllar or otherwise shaped in cross-section.
has a similar con?guration to that of the disc. The most
practical of these recently developed non~circular discs has 20 The projections 15 illustrated in FIGURE 1 are circular
in cross-section and are located in close proximity to the
been the disc described and claimed in the copending appli
center of the disc and pad where they extend upwardly
cation of Leland H. Vorce, Serial No. 9,345, ?led Febru
from the Working surfaces of the pad a distance suf?cient
ary 17, 1960.
to project through openings in the surface of the abrasive
In its preferred embodiment, this disc has two parallel
disc superimposed upon such pad.
straight edges, the ends of which are joined with an arcuate 25
FIGURE 2 is a plan view of a modi?ed pad 2!) alone,
edge as illustrated in FIGURE 1 of the drawings. In use,
the center hole 21 and the projections 22. In
such non-circular discs are mounted on a back-up plate of
this illustration only two projections are shown and these
rubber, steel or the like which conforms in shape to the
as rectangular in cross-section rather than circular as in
shape of the disc. Care must be taken to line the disc up
1. Pad 20 is shown as having a depressed center
with the pad so that the pad is completely covered by the 30
common expedient in many coated abrasive
disc. When the central fastening device (usually a nut
‘back-up pads. The projections 22 have a portion 24 thereand washer threaded over a shaft extending through a
of which extends above the plane of the working surfaces‘
center hole on the disc and pad) is tightened, the disc
of the pad. By the term “working surfaces” is meant
frequently becomes misaligned with the pad. Likewise,
even with proper alignment, in usage there may be some 35 that portion of the back-up pad which is in contact with
the abrasive disc mounted thereon at a point immediately
slippage between the disc and the pad resulting in the unde
below or closely adjacent the portion of the abrasive disc
sirable misalignment of pad and disc. When misalign
which contacts the workpiece to be abraded. It is within
ment occurs, the pad is damaged by contact with the work
the scope of the present invention to utilize any number of
piece or the disc itself is torn when the unsupported section
thereof engages the work.
40 such projections, the objects of the invention being
achieved so long as at least one projection is provided.
Accordingly, it is an object of the present invention to
FIGURE 3 is a side view of the pad of FIGURE 2 illus
provide a means for preventing misalignment of a non
trating the manner in which the projections 22 extend up
circular disc on a back-up pad.
from the surface of the pad 20.
An additional object of the present invention is to pro
The projections on the pad of the present invention are
vide an improved back-up pad for use with non-circular 45
has been to place a circular abrasive disc on a circular pad
and to fasten the disc to the pad by any of a number of
Additional objects, if not speci?cally set "‘forth herein,
preferably moulded into the pad when it is formed (if
made of rubber, plastic or the like) but could obviously
be adhered to the surface of an existing pad by any suit
able adhesive or mechanical fastening means if desired.
I claim:
A non-circular back-up pad for coated abrasive discs of
FIGURE 1 is a plan view of a back-up pad of the present
similar con?guration to the pad comprising a ?exible, rela
invention with a coated abrasive disc in place thereon and
will be readily apparent to one skilled in the art from the
following detailed description of the invention:
‘In the drawings:
tively planar member; means on said member to secure
the same to the shaft of a rotary tool; and means to posi
FIGURE 3 is a side view of the back-up pad of FIG 55 tively locate and hold the abrasive disc on said member
in direct alignment with said member, said last-mentioned
URE 2.
the assembly mounted on a spindle of a power sander.
FIGURE 2 is a plan view of a modi?ed pad.
Generally, the present invention contemplates the pro
vision of positioning projections on the face of the pad,
so located and formed as not to interfere with the normal
use of the coated abrasive discs mounted upon such pad. 60
means comprising at least one relatively ?exible projection
extending outwardly from the surface of said member.
References Cited in the ?le of this patent
More speci?cally, the invention contemplates the use of
one or more relatively ?exible projections ?rmly a?‘ixed
to the surface of the pad, said projections having at least
Stever ________________ __ Oct. 3, 1,933
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