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Патент USA US2129105

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Sept. 6, 1938.
2,129,105
T. E. SPENCE‘
DUST BAG FOR PNEUMATIC CLEANERS
Filed July 2, 1957
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INVENTOR
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ATTORNEYS
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2,129,105
Patented Sept. 6, 1938
UNITED STATES PATENT orricr.
2,129,105
DUST BAG FOR PNEUMATIC‘ CLEANERS
Thomas E. Spence, Madison, Wis.
Application July 2, 1937, Serial No. 151,595
3 Claims. (Cl. 183-51)
My invention relates to- improvements in dust
bags for pneumatic sweepers and cleaners.
The object of my invention is to provide a
dust bag fora pneumatic sweeper which is so
5 constructed as to be readily and quickly opened
and effectively closed in a dust removal or dump
ing operation.
More speci?cally stated, it is the‘ object of my
invention to provide for complete opening of a dust
10 bag of the type described at the bag’s largest
dimension, and still to provide a construction
which will give an effective closure which will
prevent escape of dust in the operation of the
sweeper.
15
In the drawing:
Figure 1 is a side elevation of my sweeper bag
and showing in dotted lines a conventional type
of vacuum cleaner with which my dust bag may
be assembled.
,
Figure 2 is a vertical section through a cleaner
bag made in accord with my invention.
Figure 3 is a detail in section showing the
relation of the parts making'up the joint use-d
inmy improved bag.
'
~
Figure 4 is a diagrammatic view of one “loop”
of my bag opening, being inserted into the other
loop in the closing or opening of my dust bag.
Like parts are designated by the same reference
characters throughout the several views.
The ordinary vacuum cleaner I0, as shown
3O
in somewhat conventional form in dotted lines
in Fig. 1, is provided with a fan in a housing II
whereby to draw air through a dust pickup nozzle
I2 and deliver it through a delivery conduit I3
35 into a bag I4 which is usually made of fairly
closely woven fabric. The bag I4 is usually in
clamping or bayonet connection with the con
duit I3 at I5, and in many of the sweeper bag
constructions heretofore used, the only method of
40 dumping the bag I 4 is to disconnect the upper
portion of the bag from the sweeper handle I6
by unhooking some portion of the supporting
chain at I ‘I, then by unhooking the bayonet con
nection I 5 all of the dust theretofore accumulated
45 in the bag I4 must be removed through the small
ori?ce at I5. This operation requires that the
matted quantities of dust and threads picked up
by the nozzle I2 must be manually plucked
through the small opening at I5.
I therefore provide a bag I4 which is provided
with a joint I8 at an intermediate point between
the bayonet connection I5 and the upper tip I9 of
the bag, and I have found that a joint approxi
mately in the middle of the bag, at its largest
55 dimension, is most satisfactory. It is with the
placing of this joint at an intermediate point at
a large dimension of the bag and the formation
of the joint in the particular manner now to be
described, that my invention is concerned.
A joint formed at I8 as indicated must be sub
stantially air tight during the operation of the
cleaner, and must still be subject to ready dis
engagement when a dust disposal operation is
to be accomplished. I therefore form a fairly
large hem in each of the margins formed by the 10
severing of the bag along the lines indicated in
the drawing, thus providing a loop of the fabric
material of the bag Ill in each of said margins to
receive a heavy spring wire loop 20 in one of
said hems 2!, which shall hereafter be called 15
the outer loop. I provide a lighter spring wire
loop 22 in the other of said hems 23. The wire
loop 22 is of identical diameter with that of outer
loop 20, and is only receivable into its inner po
sition, locked behind a shoulder 24 formed by
the outer loop 20 and its hem 2i, by distortion
of the wire loop 22, as shown in Fig. 4. After
the inner loop 22 has been “distorted” to form
an ovoid loop for insertion through the outer
loop 20, it may be released to again assume a 25
circular con?guration which will naturally as
sume a position concentric with the outer loo-p
20 and where it will rest against the shoulder 24.
When my improved bag i4 is under pressure
of air delivered through the conduit I3, the joint
at I8 is practically pneumatically sealed, for the
pressure from within forces the material of the
large hem 23 against the hem 2|, and the in
creased pressure of the loop 22 against the loop
20 assists in sealing the joint.
35
It will be noted that by reason of the size of
the hems 2I and 23, the stitching 25 and 26 used
to form the hems is not in position to disturb
the smooth surface of the fabric at the point
where the loops are brought to bear upon one 40
another.
When a bag constructed as above described is
to be opened for the disposal of dust, the manipu
lation of the loop 22 while the bag is not under
internal pneumatic pressure, will result in the 45
distortion of the loop 22 into the ovoid form
shown in Fig. 4 ‘to permit of the release of the
loop 22 from the loop 20. Immediately, there
fore, the two “halves” of the bag I4 are wide open
for the release of the accumulated dust and dirt, 50
and no picking or removal of packed dirt in a
small ori?ce is necessary.
I claim:
1. In a cleaner operable on the principle of
air movement, a bag for the reception of dust 55
2
2,129,105
laden air, said bag being provided intermediate
its ends with a line of severance of the parts
thereof, the meeting margins of said parts being
provided with wire-like loops of substantially
identical diameter, one of said loops comprising
an inner reinforcement receivable within the
outer loop by distortion.
'
2. A vacuum cleaner bag having an inlet open
ing and being provided with two severable parts
formed thereby, and the other of said loops being
larger in circumference than the opening de?ned
by said outer loop, whereby said second loop may
only be receivable through the outer loop when
said second loop is in distorted con?guration.
3. In a vacuum cleaner bag formed of two parts
for ready separation for dust disposal, each of
said parts being provided with a hem, a wire
like loop of substantial thickness in cross section
severable along a line spaced from said inlet
receivable in one of said hems to form an outer
opening, said parts being provided with margins
loop with an inwardly disposed shoulder, and an
inner loop disposed in the other of said hems re
ceivable in abutment against said shoulder.
hemmed to receive spring reinforcing wire-like
loops, one of said loops comprising a reinforce
ment for an outer member for the joint to be
THOMAS E. SPENCE.
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