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Патент USA US2412572

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Dec. 17, 1946.
Filed May 20, 1944
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17 79 1,;
Patented Dec. 17, 1946
Otto Fleck, Botha, Alberta, Canada .
Application May 20, 1944,-Serial'No. 536,591
4 Claims. (Cl. ,51;-.—185)
The invention relates to means for grinding
to a proper seat the edge portions of receptacles
such as preserving jars and particularly jars
made of glass, and also toenable ?nishing of
the glass covers for such‘ jars, to the end that a
proper surface will be a?orded by which a per
fect seal may be effected against jar rubbers and
the like.
Figure 4 is a top view of the device showing
the manner in which extreme end portions of
the abrasive sheet may be used, and also showing
the manner of cutting the sheets to admit a
closure cap.
Figure 5 ‘is an. elevational'view showing the
grinding pf a closure cap of. a jar and a tool ior
rotating the cap.’
The-primary object or" the invention is to pro
There is illustrated a jar and jar cap grinding
vide a stationary simple and inexpensive device 10 device consisting ~ of a substantially planiform'
plate 1 fl, preferably ofmetal, although it may also
suitable for domestic use, by the housewife in
he produced in’ plastics, stone and other mate- I
the kitchen, to assure safe sealing of jars, with
a minimum of difficulty and without requiring
rials. The plate is preferably square in plan,
expert knowledge or. dexterity in the handling of
and oi’ a thickness preferably somewhat more,
the apparatus.
15 or at least-equal to the vertical dimensions of
I am aware of ‘the common practice of using
aglass jar top A I, from its grinding face to the
crown portion [2, as shown in Figure 5. It will
abrasive sheets on plain surfaces to effect the
?nishing of objects of various kinds, but as far
behoted that the crown portion vl2 of the jar top
as I am aware, no stationary device satisfactory
terminates ‘at ashoulder l3, below which is a
for meeting the needs above stated and herein 20 horizontal flange portion M, the lower side of
which is to be ground to ?t the corresponding
after indicated, is available, it being out of ques
surface of?the mouth of the jar, as is well
tion for the housewife to have an installation
of a machine for such use, both on account of
understood in preserving jars and the like. The
plate ill is formed with a perfectly planiform
the expense, and also because of the fact that
only occasional need is felt for such appliances, 25 upper ortop surface l5, and on its lower side
and the machine would occupy a great deal of
is provided with a number of rubber-faced knobs
lfi'adapted to be set on table tops and the like,
valuable space out of proportion to the need.
'It' is aha-important object .of my invention, to
tohold the device with a minimum tendency to
provide a stationary device or‘ tool adapted to
slip on the table top. The plate is formed with
enable the grinding of the surfaces of the mouth 30 a central large opening [1, the edge portion of
oi‘ jars‘ and the like,
A further important object of the invention
is .to. guide the movements of the parts being
ground in such‘ manner that uniformity of grind
ing will be.v assured, even through an inexper
ienced person is operating the device. It is also
whichis rabbeted at the lower side of the plate,
as at l8, thus forming-a ?ange [9 which forms
a continuation of thetop surface of the plate
along the opening l7, and the surface is pref
erably bevelled as indicated at l8’.
An annular ring Eligis provided, consisting of
a-moderately thin annular wall having diametri
cally opposite anchor ears 2| adjacent the upper
sive sheets, to the end that liability of tearing
of .the same and also waste by failure to use ex
edge of the ring, the ring having sufficient depth
treme edge portions-will be avoided.
40 to afford rigidity when clamped upon the plate
It is also an important aim of the invention
It, as will be described, the lower edge portion
topresenta device which will hold the abrasive in
of the ring .23 being smoothly ?nished in a plane
an. aim to eiiect an economy in the use of abra
a steady mannerwvithout requiring heavy in
stallation or complicated mounting means.
Additional objects, advantages and features of
invention reside in the construction, arrange
ment and combination of vparts involved in the
embodiment of the invention, as will appear
from the following description and accompanying
drawing, wherein
Figure 1 is a top view of a device embodying
my invention, with the work in place.
Figure '2 is a cross sectional View thereof.
normal to. the axis of the ring. The plate Ill is
tapped and threaded to receive bolts 22 engaged
through the, ears 2| loosely, so that the ring 20
maybe ‘secured in clamping engagement with
the abrasive sheet laid upon the plate [6, with
thering 29in concentric relation to the opening
H. The diameter of the opening I‘! is somewhat
less than one-half the diameter of the ring 20,
and in no case should it beso large that the
distance from any point on the inner face of the
ring to a diametrically opposite side of the open
Figure3 ‘is a similar view at right angles to
ing H be greater than the diameter'of the jar
Figure 2 on the line 3*3 of Figure 1.
55 cap less the width ,of- its under bearing face.
In the use of the device, when grinding the
mouth of a jar or the like, a strip of abrasive
sheet material having the width slightly less than
the diameter of the ring 20, being at hand, the
abrasive portions into position within the ring
20 by loosening the bolts 22 and drawing the strip
of abrasive slidingly under the ring 20 until the
new surface is in place. It will be apparent that
bolts as shown at 22 are unscrewed sufficiently
to leave a space more than the thickness of the
when one sheet has been used from end to end,
it may be drawn inwardly with its end extending
material, and the abrasive sheet then slipped
under the ring 28. Since the abrasive sheet is
narrower than the diameter of the ring, spaces
the ring and its edge advanced into proximity of
theedge of the ?rst sheet, substantially as shown
20’ are formed at opposed sides of vthe ring to I
receive grindings and other foreign matter re
moved from the jar and abrasive sheet. The
as though an uninterrupted sheet were in place
bolts are then tightened so as to hold the sheet
?rmly in place upon the plate 10. The jar H’
to be ground is emplaced within the ring, sub- ,.
across the ring, and a fresh sheet inserted under '
in Figure 4, after which the bolts 22 may be again
tightened, and grinding proceeded with the same
under the ring 20.
In the application of my device to a type of
jar wherein the jar has a crown portion for re
taining the sealing ring, such as jars known as
Corona jars, a slightly different procedure is re
quired. The sealing rim of such jars can be trued
up by my device when applied as in Figures 4 and
5 with the device inverted. For treatment of the
stantially as shown in Figures 1, 2 and 3, and then
by grasping the jar it is moved about upon the
abrasive sheet with a gyratory motion. If de
sired, a small quantity of oil may be employed
upon the sheet to facilitate grinding. In the
tops of the jars the device is employed as in Fig
gyratory movements of the jar upon the abrasive,
ures 1 to 3.
small points, hair-like ridges, small grooves and
The sealing edges of such jar tops can be tested
the like are removed under comparatively short
for accuracy on the top side or planiform top
manipulations, these faults in the surfaces being
accountable for failure of the seat if they should 2.7 surface of my device after the clamping ring and
abrasive sheets are removed.
be present when the jar tops are applied to use
This procedure is also applicable to other types
upon the jars in the conventional way. House
of jars. The purpose of the crown portion on
wives have experienced many failures due to such
certain types of jars is to retain the sealing ring
causes, and in most cases are unaware of the
‘ reason for spoilage of canned goods or preserves. 3 O in its proper place. In the drawing are shown
only jar tops of this character. It is obvious
A number of jars having been treated in the
that in other types of jars and tops, such as above
manner described, and it is desired to grind the
described, wherein the jar has the sealing ring
closure caps, the ring and the abrasive sheet is
seat and the top none, the device is equally effec
removed from the plate l0, and the latter inverted
as in Figures 4 and 5, so that its top may rest 35 tive.
While I have shown my device with exactitude
upon the table or the like, upon which the article
in a form in which it has been successfully con
is placed. As shown in Figure 4, a pair of abra
structed and used, it will, nevertheless, be under
sive sheets are employed, arranged in end to end
stood that this is exemplary, and that some modi
relation, the end portions being formed with
semi-circular openings of a diameter the same as 40 ?cations in the structure, arrangement of parts,
substitution of materials, and equiva1ents,'me
the rabbet [8 of the plate. The abrasive sheets
chanical and otherwise, may be carried out with
are now clamped in position by the ring 20. The
out departing from the spirit of the invention ex
closure cap H is then disposed within the rabbet
cept as may be more speci?cally indicated by the
l8 and the openings of the abrasive sheet.
appended claims, wherein I claim:
It should be noted that the depth of the rabbet
1. A combination tool comprising a plate hav
I8 is greater in depth than the vertical dimen
ing upper and lower planiform surfaces, an abra
sions of the shoulder I3 to a substantial extent,
sive sheet clamping ring having a planiform lower
so that when the plate In is inverted, as in Figure
edge, means to clamp the ring upon the plate,
5, and the cap ll laid thereon, the ?ange portion
14 may rest upon the inclined face I8’ of the 50 said ring being of a diameter related to the di
ameter of the work, said plate having a large
plate it? without the crown portion of the cap
opening therethrough concentric with the ring,
engaging against the ?ange l9.
the diameter which, plus the distance between
With the cap in position it is rotated so that
the opening and the ring at one side is less than
the sealing face of the ?ange will be ground
the diameter of the work, said opening being
smoothly by engagement with the abrasive sheets.
In Figure 5, I have indicated a tool 23 for ro
rabbeted on the under side to a diameter to re
ceive the crown portion of the work free of con
tating the closure cap I I, which comprises a body
tact with the plate, for the purposes described.
portion provided with a lower end of a diameter
2. A device for truing the sealing ?ange of a
slightly less than the interior of the cap. Upon
the lower end of the body an elastic gripping pad 60 jar cap comprising a plate having a planiform top
surface to serve as a stationary grinding table for
24 is secured. The pad 24 is preferably of rubber
support of an abrasive sheet, said plate being
or like material, so that a ?rm grip may be had
reversible to present the bottom side upwardly at
upon the cap by slight downward pressure upon
times, said bottom side being formed with a cen
the pad.
Testing of a closure cap before grinding may be 6: tral rabbeted portion of a diameter adapted to
receive the crown portion of an inverted jar cap
accomplished by removing the abrasive sheets
so that its outer ?ange may rest upon an abrasive
and ring and disposing the cap Within the rabbet
sheet disposed upon‘ said plate and around said
18. If the sealing face of the closure top is true
central rabbeted portion.
it will lie smoothly within the rabbet without an
3. A device of the character described compris
unbalanced motion. Since the grinding opera 70
ing a plate having a planiform top surface to
tion produces a change in the appearance of the
serve as a stationary grinding table for support of
glass, it can readily be determined what portions
an abrasive sheet, said plate being reversible to
require further grinding.
‘ In the event that the abrasive becomes exces
sively worn, it may be readjusted to bring new
present the bottom side upwardly, said bottom
side being formed with a central rabbeted opening
of a diameter adapted to receive the crown por
tion of an inverted jar can so that its outer ?ange
may rest upon an abrasive sheet disposed upon
present the bottom side upwardly, said bottom
said plate and around said central opening.
4. A device of the character described compris
ing a plate having a plam'form top surface to
portion of an inverted jar cap, said opening hav
ing an inclined circumferential surface, whereby
serve as a stationary grinding table for support
of an abrasive sheet, said plate being reversible to
side being formed with a central rabbeted open
ingr of a diameter adapted to receive the crown
the outer ?ange of a jar cap will rest upon said
surface for testing of said cap.
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