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Патент USA US2127703

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Aug. 23, 1938.
v. e. SCHWENKE
2,127,703
METHOD OF APPLYING ABRADING DISKS TO GRINDING 0R POLISHING MACHINES
Filed NOV. 50, 1936
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Patented Aug. 23, 1938
2,127,703
UNITED STATES » PATENT OFFICE
METHOD OF APPLYING ABBADING DISKS
TO GRINDING 0R POLISHING MACHINES
Victor e. Sohwenke, pea-bu, Mioh., assignor a,
Briggs Manufacturing Company. Detroit, Mich”
a corporation of
Michigan
Application November so, 1930, Serial No. 113,320
1 Claim.
This invention relates to means and a method
01' applying abrasive sheets or disks to a grinding
or polishing head.
In accordance with previous practice the sheets
or disks of abrasive material were laid over the
face of the abrading head or block, folded over
and around the periphery or side edges of the
head and had their free edges secured to the
rear face of the head, or to the periphery there
of, by tacks or the like. Thus when the abrasive
sheets became worn, the tacks had to be removed
and the old sheets replaced by new ones which
also had to be tacked to the head. This method
of applying the sheets was a slow and awkward
one and often the tacks for securing the sheets
would cause rips or tears in the sheets during
use of the device. Such tears obviously loosened
and weakened the abrasive sheets and rendered
them un?t for use after a short period of time.
An object of the invention is to provide a new
method or mode of applying a sheet or a plu
rality of sheets of abrasive material, such as
sandpaper or emery cloth to an abrading head
in a quick, simple and el’?cient manner.
The above and other objects and advantages of
the present invention will appear from the fol
lowing description and appended claim when con
sidered in conjunction with the accompanying
drawing forming a part of this specification.
In said drawing:
Fig. 1 is an elevational view of the abrasive
face of a grinding or polishing sheet or disk
embodying the invention.
Fig. 2 is a side elevational view, partly in sec
tion,- illustrating one form of loading device em
bodying my invention, together with a grinding
head and several of the abrasive sheets or disks
embodying the present invention and showing
the relative positions of the parts during one
40 step of the mode or method of applying the
abrasive sheets to the abrading head; and '
Fig. 3 is a view similar to Fig. 2 illustrating
the ?nal step of the method or mode of applying
and securing abrasive sheets to the abrading head
45 and showing the relative positions of the parts
prior to the removal of the loading device from
the abrading head.
,
Before explaining in detail the present inven
tion it is to be understood that the invention is
50 not limited in its application to the details of
construction and arrangement of parts illustrated
in the accompanying drawing, since the inven
tion is capable of other embodiments and of
being practiced or carried out in various ways.
Also it is to be understood that the phrascology
(01. 51-197)
or terminology employed herein is for the pur
pose of description and not of limitation, and
it is not intended to limit the invention claimed
herein beyond the requirements of the prior art.
Referring now to the drawing, the abrasive
‘element per se embodying the present invention
comprises, preferably. a disk-like layer or sheet
of sandpaper, emery cloth or other backing ma
terial carrying a layer of finely divided abrasive
particles or grains.
It will be seen that the 10
?exible disk 25 has a materially greater diameter
than the circular supporting face iii of the head
A, the disk having sufficient area to cover the
face of the head and to be wrapped or folded
around the peripheral edge of the head so as to
completely lap the retaining groove H. The pe
ripherai edge of the disk is provided with a series
of deep radially extending slits. Preferably the
edge is notched as shown in Fig. 1 into a zigzag
formation to provide a series of spike-like or 20
V-shaped projections 26. The slitted or notched
edge of the disk 25, which overlies the groove
l1 in‘the supporting head or compressible back
ing member I6, is removably clamped in the
groove by means of a’ coil spring 28. Since the 25
member I6 is preferably soft and compressible
the ?exible disk may be drawn smoothly over
the crowned face of the member IB and the
marginal edge thereof, and the outlying edge of
the disk will be drawn or pulled tightly into the 30
groove by the coil spring. The radial slits or
notches in the disk will enable the edge of the
disk to accommodate the larger circumference
without buckling or causing any material wrin
kling of the disk within the groove, and the
spike-like projections or prongs 26 permit ready
removal of the disk. A number of disks, such
as three shown herein by way‘of example, may
be superimposed and clamped at one time on the
support. A worn disk can be readily stripped oiT,
without disturbing those beneath or requiring
removal of the clamping spring, simply by
spreading the spring at any point, prying out
and freeing one of the prongs or tabs 26 from
beneath the spring, releasing the spring and then 45
grasping the freed tab and stripping the top disk
from the support.
Referring now particularly to Figs. 2 and 3,
there is shown a loader embodying the present
invention for loading or assembling disks upon 50
the polishing head. In practice, and in accord
ance with my invention, it is customary to apply
to the supporting block or abrading head A a
plurality of superimposed disk-like sheets of
abrading material so that when the topmost sheet
2,127,708
has become worn it can be removed to expose
the next sheet, thus eliminating the necessity of
removing and replacing a single sheet at a time.
The loader of the present invention is shown
as a whole at B and comprises, preferably, a
circular‘block 80 of wood or other suitable ma
terial having formed in one portion of its periph
ery an annular depression or groove II and hav
ing attached adiacent the lower edge of its pe
ripheral face, a metal band I! which is held in
place upon the block in any suitable manner, as
by means of tacks II. This metal band has a
?ange portion "a, which extends below or be
yond the bottom face I4 of the block B. Posi
15 tioned centrally of the block 80 and in its inner
or under face, is a screw threaded stud "having
the exposed portion of its shank I8 projecting
below or beyond the bottom face 34. The di
ameter of the block may be substantially the same
20 as the corresponding diameter of the‘ abrading
head A but as will be seen in Fig. 3, when the
block is placed upon the top face of said abrading
head, the projecting portion or ?ange 32a. of the
metal band overlaps a portion of the periphery of
25
said head.
-
'
As shown in Fig. 2, the head A has been dis
connected from its supporting handle and ?exi
ble power shaft (not shown) and inverted upon
a flat surface E. A number of abrasive disks 25
30 is placed or stacked upon the top face of the
abrading head A. The loader B is pressed down
upon the head A forcing the ?ange 32a over the
edge thereof thus folding the edges of the disks
over the edge of the member I0, and drawing
the superimposed disks taut across the face of
the support. During this movement the shank
36 of the locating pin 35 punctures a hole through
the centers of the several abrading disks 2B and
forces the surrounding portions of the holes into
40 the aperture I! so that when the head is in use,
water fed through the tube 23 can pass through
the punctured openings in the disks and impinge
upon the surface of the work. As shown in Fig.
3, the disk retaining spring 28, previously re
ferred
to, is located in expanded condition with
45
in the peripheral groove 3| formed in the block
B. After the block has been forced down upon
the abrading head (Fig. 3) the spring is rolled or
slid downwardly from its position within the
groove II and over the outer face of the circular
?ange Ila. When the spring has been moved
beyond the lower edge of {the ?ange and is free
of the same, it will contract and spring into the
groove or recess l‘l clamping the notched edges
of the disks therein. Since the spring is still un
der tension it will bind the edge portions ll of
the disks ?rmly in place in the groove H and 10
hold said disks tightly in place upon the head A.
The loader B may now be removed and the abrad
ing head A threaded upon the coupling 22 of the
?exible hollow shaft 2| until it engages the
handle III. The device is now in readiness for In
use.
After the disks 2! on the head have been used
up and it is desired to replace them with new
ones, the loader may be mounted in the manner
shown in Fig. 3 and the spring 2! rolled back
upon the loader until lodged in the groove ll
thereby releasing the last of the disks remain
ing upon the head A. A new supply of disks may
then be applied in the manner described above.
Thus the replacement of the disks can be accom
plished quickly and easily without the use of
tacks, screws or special tools.
By virtue of the present invention it is possible
to apply one or a plurality of abrading disks or
sheets to an abrading head without necessitat
taching the disks, and to remove or replace the
worn disks or sheets with ease and facility.
I claim:
The method of applying an abrading disk or
disks to an abrading head having a groove formed
in its periphery, which comprises the steps of
placing the disk or disks over the working face
of the head, forcing an annular ring member
down over the head to fold the edges of the disk
down over said annular groove, simultaneously
puncturing the center of said sheet, and there
after shifting a ring-like binder device over the
fact of said annular ring member and said head
to anchor the same in position within the groove 45
and bind the sheet to the head.
VICTOR G. SCHW'ENKE.
cam-Indira or commoner.
August 23, 1938.
Patent 110-. 2,127,705.
VICTOR G. scmmsn.
It is hereby certified that error appears in theprinted specitieation
of‘ the above numbered patent requiring correetionas follows: Page 2, second
column, line 141;, intho claim; for "fast" read face; and that the said Let
tors Patent should be read with this correction therein that the same may
conform to the record of the case in the Patent Office,
‘ Signed and sealed this 1st day of‘ novsmbarfi. n. 1953.
Henry Van Aredale
(Seal)
30
ing the use of tacks, screws or the like for at
Acting commissioner; of Patents.
2,127,708
has become worn it can be removed to expose
the next sheet, thus eliminating the necessity of
removing and replacing a single sheet at a time.
The loader of the present invention is shown
as a whole at B and comprises, preferably, a
circular‘block 80 of wood or other suitable ma
terial having formed in one portion of its periph
ery an annular depression or groove II and hav
ing attached adiacent the lower edge of its pe
ripheral face, a metal band I! which is held in
place upon the block in any suitable manner, as
by means of tacks II. This metal band has a
?ange portion "a, which extends below or be
yond the bottom face I4 of the block B. Posi
15 tioned centrally of the block 80 and in its inner
or under face, is a screw threaded stud "having
the exposed portion of its shank I8 projecting
below or beyond the bottom face 34. The di
ameter of the block may be substantially the same
20 as the corresponding diameter of the‘ abrading
head A but as will be seen in Fig. 3, when the
block is placed upon the top face of said abrading
head, the projecting portion or ?ange 32a. of the
metal band overlaps a portion of the periphery of
25
said head.
-
'
As shown in Fig. 2, the head A has been dis
connected from its supporting handle and ?exi
ble power shaft (not shown) and inverted upon
a flat surface E. A number of abrasive disks 25
30 is placed or stacked upon the top face of the
abrading head A. The loader B is pressed down
upon the head A forcing the ?ange 32a over the
edge thereof thus folding the edges of the disks
over the edge of the member I0, and drawing
the superimposed disks taut across the face of
the support. During this movement the shank
36 of the locating pin 35 punctures a hole through
the centers of the several abrading disks 2B and
forces the surrounding portions of the holes into
40 the aperture I! so that when the head is in use,
water fed through the tube 23 can pass through
the punctured openings in the disks and impinge
upon the surface of the work. As shown in Fig.
3, the disk retaining spring 28, previously re
ferred
to, is located in expanded condition with
45
in the peripheral groove 3| formed in the block
B. After the block has been forced down upon
the abrading head (Fig. 3) the spring is rolled or
slid downwardly from its position within the
groove II and over the outer face of the circular
?ange Ila. When the spring has been moved
beyond the lower edge of {the ?ange and is free
of the same, it will contract and spring into the
groove or recess l‘l clamping the notched edges
of the disks therein. Since the spring is still un
der tension it will bind the edge portions ll of
the disks ?rmly in place in the groove H and 10
hold said disks tightly in place upon the head A.
The loader B may now be removed and the abrad
ing head A threaded upon the coupling 22 of the
?exible hollow shaft 2| until it engages the
handle III. The device is now in readiness for In
use.
After the disks 2! on the head have been used
up and it is desired to replace them with new
ones, the loader may be mounted in the manner
shown in Fig. 3 and the spring 2! rolled back
upon the loader until lodged in the groove ll
thereby releasing the last of the disks remain
ing upon the head A. A new supply of disks may
then be applied in the manner described above.
Thus the replacement of the disks can be accom
plished quickly and easily without the use of
tacks, screws or special tools.
By virtue of the present invention it is possible
to apply one or a plurality of abrading disks or
sheets to an abrading head without necessitat
taching the disks, and to remove or replace the
worn disks or sheets with ease and facility.
I claim:
The method of applying an abrading disk or
disks to an abrading head having a groove formed
in its periphery, which comprises the steps of
placing the disk or disks over the working face
of the head, forcing an annular ring member
down over the head to fold the edges of the disk
down over said annular groove, simultaneously
puncturing the center of said sheet, and there
after shifting a ring-like binder device over the
fact of said annular ring member and said head
to anchor the same in position within the groove 45
and bind the sheet to the head.
VICTOR G. SCHW'ENKE.
cam-Indira or commoner.
August 23, 1938.
Patent 110-. 2,127,705.
VICTOR G. 3.
It is hereby certified that error appears in theprinted specitieation
of‘ the above numbered patent requiring correetionas follows: Page 2, second
column, line 141;, intho claim; for "fast" read face; and that the said Let
tors Patent should be read with this correction therein that the same may
conform to the record of the case in the Patent Office,
‘ Signed and sealed this 1st day of‘ novsmbarfi. n. 1953.
Henry Van Aredale
(Seal)
30
ing the use of tacks, screws or the like for at
Acting commissioner; of Patents.
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