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Get. 8, 1946.
2,409,363
w. STEVER
BACKING PAD FOR ABRASIVE DISKS
Filed Sept.» 15, 1943
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w. STEVER
2,409,163
BACKING PAD FOR ABRASIVE DISKS
,Filed Sept. 15, 1943
2 Sheets-Sheet 2
411615
74m . .
44
INVENTOR
William Siever
A TTORNE Y
Patented Oct. 8, 1946
2,40%,163
UNITED STATES PATENT OFFICE
2,409,163
BACKING PAD FOR ABRASIVE DISKS
William Stever, Philadelphia, Pa., assignor to The
Budd Company, Philadelphia, Pa., a corpora
tion of Pennsylvania
Application September 15, 1943, Serial No. 502,423
6 Claims. ' (Cl. 51-197)
1
The invention relates to a support for circular
abrasive disks, and more particularly to a disk or
supporting pad which is stiff yet ?exible to a cer
tain degree and which preferably consists of a
material such as vulcanized ?bre.
Among the objects of the invention is a disk or
2
Exchangeably attached to the head II is an
abrasive disk l9 by means of a central nut 20
screwed on the central cylindrical portion 2| of
the body H. The member 20 has an outwardly
?aring portion 22 which presses the abrasive disk
I9 and the disk l4 against the conical recessed
more desirable characteristics of ?exibility and. a
surface of the body II and presses, furthermore,
the abrasive disk I9 against the shoulder 12.
longer life than the known forms of such disks.
The aforesaid objects of the invention and
disk or pad prevents to a considerable degree the
backing pad of the indicated type which has
' other advantages are mainly achieved by a disk
The provision of the beading 16 in the backing
warping of the disk which is commonly experi
enced with ?bre disks without such beading.
of ?bre which is provided with a circular bead
Moreover, the bead prolongs the life of the back
ing at some distance from its periphery.
Contributory to the desired result are also the
ing disk.
The embodiment shown in Figs. 4, 5 and 6, has
support of said disk by the head for holding it 15
again a driven shaft 25 screwed into a member
at or near the location of said beading.
26 forming part of the supporting head 21, and
The aforesaid and further objects and features
the backing disk 28 has the ?at outer portion 29
of the invention will become more clearly under
and an annular beading 30. However, the disk
stood from the illustration of two embodiments
28 is not directly fastened to the head 21 but is
in the attached drawings and the following de
attached to an annular metal disc 3| by rivets 32
scription thereof.
arranged in the beading 30. The member 21 is
In the drawings:
provided near its outer circumference with an
Fig. 1 is a fragmentary view of an abrasive disk,
annular recess 33 having along its inner circum
its backing pad and its supporting head, certain
central portions being broken away so as to make 25 ference undercut segment shaped shoulders 34.
These shoulders are evenly distributed over the
the underlying construction visible;
circumference leaving spaces between them. The
Fig. 2 is a section along line 2-2 of Fig. 1;
disk 3| has along its inner circumference in
Fig. 3 is a view of the supporting head looked
wardly directed sector shaped extensions 35
at in the same direction as in Fig. 1;
Figs. 4, 5 and 6 are views corresponding to Figs. 30 adapted to engage the shoulder 34 by rotation
of the member 21 relative to the disk 3|. The
1, 2 and 3 yet of a different embodiment; and
movement-between these two members is limited
Fig. 7 is a fragmentary section similar to Fig.
2 yet of a third embodiment.
by pins or other stops 36.
The central portion of the member 21 is re
In Figs. 1 to 3, a driven shaft I0 is attached to
cessed similarly to the ?rst embodiment and the
a supporting head II which has its central por
central portion of the abrasive disk 31 is held
tion recessed and provided with an annular un
by a nut 38 screwed on the member 26.
dercut shoulder l2. An outer marginal portion
The embodiment shown in Fig. 7 differs from
l3 of the body II is likewise recessed and offers
the embodiment shown in Figs. 4 to 6 in the
a plane surface.
A circular disk or pad It consists of resilient 40 attachment of the backing disk 40 to its support
til at 42 inwardly of the beading 43, the adhesive
sti?‘ material such as vulcanized ?bre. The outer
attachment of a layer 44 of fabric, rubber or
annular zone [5 of the disk I4 is substantially
other sheet material to the disk 40, and in the
?at. Inwardly of the zone l5, the disk I4 is pro
provision of a-similar beading 45 in the abrasive
vided with an annular beading l6 which rests
against the marginal portion l3 of the head II. . disk 46. The disks illustrated in Fig. '7 may be
used with the head shown in Figs. 4 to 6.
The innermost portion I‘! of the disk I4 is slight
The invention is not restricted to the illus
ly conical and slotted at 18 at certain intervals
around its central opening. The inner margin
trated embodiments, but it is intended to cover
of the disk l4 extends under the undercut shoul
all such further modi?cations which fall within
der l2 and is held ?rmly in place by squeezing 50 the spirit of the invention and will occur to those
said shoulder against it. The part of the body I I
skilled in the art.
carrying the shoulder I2 may be of comparatively
What is claimed is:
soft material such as aluminum which allows the
1. Flexible disk for supporting abrasive means,
said disk consisting of sheet material and com
deformation of the shoulder I2 so as to hold said
prising a wide substantiallly ?at annular mar
disk.
2,409,163
4
3
ginal portion, an intermediate narrow annular
portion forming a beading on one side and an
open groove on the other side of the plane of said
disk as de?ned by its said marginal portion and a
central portion adapted for attachment to a sup CI
porting head, said beading and groove imparting
to the disk added ?exibility and reducing warp
ing and breakage.
2. In a grinding or polishing device, a head
adapted for connection to a driven shaft and a
disk in the form of a web of substantially con
stant thickness throughout supported by said
head and adapted for supporting abrasive ma
metal disk serving for the attachment of the
beaded disk to a supporting head.
4. Disk in sheet form covered with abrasive
material having an annular narrow. Zone axially
offset to form a projection on one side and a
groove on the other side, said zone being arranged
at some distance inwardly from the periphery
of the disk, said, projection and groove improv
ing the ?exibility and the resistance against
Warping and breakage of the disk.
5. Disk according to claim 1 and a sheet metal
disk of smaller diameter, said metal disk being
attached to the ?exible disk near to the inner
circumference of said beading.
terial, an annular beading formed in one side
6. Backing disk for a disk covered with abra
and a corresponding open groove in the other 15
sive material comprising a ?exible sheet provided
side of said disk between its inner and outer
margins resting against said head near the outer
circumference of the latter, said beading and
groove serving to improve the flexibility and the
resistance against Warping and breaking of
the disk.
,
3. Disk according to claim 1 and a sheet metal
supporting disk of smaller diameter, said two
disks being connected to each other in the region
near to and including said beading, said sheet
with an annular beading on one side and a cor
responding open groove on the other side at a
distance inwardly from its outer periphery, a thin
layer of soft material adhesively attached to the
?exible disk, said beading and groove and said
layer of soft material improving the ?exibility
of the disk and increasing its resistance against
Warping and breaking.
W'HiLIAM STEVER.
25
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