Note: Descriptions are shown in the official language in which they were submitted.
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This is a division of our co-pending Canadian Patent
Application No. 598,130 filed April 28th, 1989.
The present invention relates to a vacuum cleaner
filter bag for an electric vacuum cleaner.
The changing of filter bags, including the removal of
the full filter bag, requires some dexterity.
It is the object of the invention to improve an
electric vacuum cleaner in a manner which is simple to
manufacture, with respect to the handling thereof and, in
particular, in such a manner that the clean, convenient removal
of a full filter bag is possible.
Accordingly the present invention provides a vacuum
cleaner filter bag comprising a bag body closed at one end; an
end wall engaging with said body at a second end of said body
opposite said one end; and wherein said end wall has an opening
for the bag to serve as an air inlet to the bag; said end wall
has grip notches and three tongues arranged in angular symmetry
to the bag opening; and two of the tongues are arranged on a
side edge of the bag opening and extend directly into the grip
notches via oblique flanks of the tongues.
The subject matter of the invention will be explained
in greater detail below with reference to an embodiment shown in
the drawing, in which:
Fig. 1 is a view of a further developed version of the
electric vacuum cleaner, with the swung-out position of the
chamber containing the filter bag shown in dash-dot line,
Fig. 2 shows the region of swing of this vacuum
cleaner in closed position, partially broken away,
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Fig. 3 is a section along the line III-III of Fig. 2,
the section being broken away only in part,
Fig. 4 shows, greatly enlarged, the right-hand edge
portion of Fig. 3, illustrating the cam engagement,
Fig. 5 is a sectional view corresponding to Fig. 2
but in opened condition and approximately vertically stopped
position of the intermediate support,
Fig. 6 shows, greatly enlarged, the region of the
socket with valve flap formed by the edge extrusion,
Fig. 7 is a top view of Fig. 5,
Fig. 8 is a top view of the edge portion of the
apparatus, on the side of the swing shaft,
Fig. 9 is a section along the line IX-IX of Fig. 8,
Fig. 10 is a section along the line X-X of Fig. 8,
illustrating the detent attachment position,
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Fig. 11 shows the position of the swing shaft in the
condition of Fig. 7,
Fig. 12 shows the position of readiness for removal, in
which the chamber socket must still be swung
slightly outward for the lifting out of the trap
heads, so that the trap head assumes a congruent
position to the radial slot above it,
Fig. 13 iq a front view of the region of the swing shaft,
Fig. 14 is a perspective view of the corresponding filter
bag, and
Fig. 15 i8 a section along the line XV-XV of Fig. 7.
The electric vacuum cleaner shown is designed as a hand-
held apparatus. It has a housing l with a rod 2 at the top
which has a handle 3 at it~ end. An on/off switch 4 is
provided in the transition region between handle 3 and rod 2.
The connection of the electric cord is not shown.
The housing l is divided into a motor housing 5 and a
chamber 6 above it to receive a filter bag 7. The motor fan
has also not been shown in detail in the drawing.
The qide of the filter bag 7 facing the motor housing 5
is in communication via a socket V with the fan air duct 8.
The motor housing 5 passes on its bottom into a tube
coupling 9 which establishes the air flow connection to a
suctlon nozzle lO.
The suction nozzle lO can be a so-called suction-brush
nozzle which has a brush roller in the mouth of the nozzle,
the brush roller being placed in rotation by a separate
drive.
The fan motor therefore operates in upward direction and
consequently force~ the dust-laden air into the filter bag 7
arranged upside down above the motor housing S.
The entire crosq-section of the housing l is a long
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rectanqle with slightly bulging broad sides and similar
narrow sideQ. Figure 1 shows the vacuum cleaner, seen from
it~ broad slde.
The chamber 6, which receives the filter bag 7 of
corre~ponding cross-section i9 formed by a textile bag 11
which i9 stiffened by a wire~basket and which passes on the
bottom, i.e. on the side of the motor housing, into a
stiffened edge in the form of a chamber socket 12. The
stiffened textile bag 11 can be attached to this chamber
socket 12 by means of releasable clip-plug connection. The
plug-on region is stepped-down for this purpose. The step
can be noted from Fig. 1. It permits a well-defined inner or
outer attachment oE the textile bag. An inner plug
attachment is preferred.
For the removal Oe the filter bag 7, the housing 1 can
be swung open with practically total freeing of its cross-
section, The swung-open position can be noted from Fig. 1
(shown there in dash-dot line)`and from Figs. 5 and 7. The
swing shaft 14 which makes thi~ possible is located on one
narrow side of the housing 1. Its bearing lugs on the
chamber-socket side bear the reference number 15. These
bearing lugs are located in the transition region between the
narrow side and the broad side of the chamber 6. A
continuous bearing lug of the motor housing 5 extends between
the two bearing lugs 15.
In the region of the parting joint between motor housing
5 and chamber 6 there is furthermore integrated an
intermediate support T on which the filter bag 7 is seated.
The filter bag intermediate support ~ has a cross-section
which is adapted to the cross-section of the housing but is
set back from the wall of the housing so that in the coaxial
position of motor housing S and chamber 6 shown in Fig. 1 it
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is s~bstantially completely blocked from view. Except for a
small place for access, it is namely gripped by the
projecting lower edge Oe the chamber socket 12 of the filter
bag intermediate support T which is also attached in
swingable manner, and swings around the same swlng shaft 14
as the filter-bag chamber 6. On the hinge side, the
intermediate support T therefore also forms, in the same
manner as the chamber socket 12, two bearing lugs provided
here wlth the reference number 16.
The filter bag 7 which directly adjoins the intermediate
support T has a bottom 17. Its general contour also
corresponds to the cross-sectional shape of the chamber
socket 12 which for the supporting application in the region
of the narrow sides of the bottom 17 forms one edge step 18
each on the inner wall. As a result of this, the bottom 17
cannot slide into the chamber 6 in the swung-open position of
the apparatus. The bridge-like application of the bottom 17,
on the other hand, results in a certain ability of the bottom
to bend in the central region. The common swing shaft 14 of
the chamber socket 12 and the filter-bag intermediate support
T extends approximately at the level of the supporting edge
step 18 of the filter-bag bottom 17. In the closed housing
~Fig. 2), the edge step grips over the top side of said
bottom 17 so that it is not pushed off in upward direction
upon the suction blowing. As already indicated, the lower
side of the bottom 17 re.sts on the top side of the filter-bag
intermediate support T. There results in this connection, in
the regions of the narrow side of the bottom 17, a sort of
clamping-jaw fastening between the chamber socket 12 and
intermediate support T.
In this position, with the stepped-down, cylindrical
mouth end 8' of the blower air duct 8 extends into the lower
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region of a socket 19. The latter protrudes above the top
side of the filter-bag intermediate support T. The socket 19
i9 formed from the very start on the intermediate support T
and, passing through an opening 20 of corresponding cross-
section in the filter-bag bottom 17, extends into the inside
of the filter bag 7, sealing t,he edge.
In order to prevent sucked-in material falling back into
the reglon of the motor housing S in view of the upside down
position shown, the socket 19 is provided at its free end
with a valve flap 21. The latter freely rests with the
predominate part of its edge region on the end of the socket
19. It is flxed in position merely at the place designated
22, ~o that it lifts off under the action of the flow of air
but returns into its closed position upon a reduction in the
corre9ponding load on the bottom side. The valve flap 21 can
be made as a separate part and be associated with the place
22 by means of a clip attachment; as an alternative there is
of course the possibility oÇ forming it thereon in the case
of correspondingly flexible material of the socket 19 of the
filter-bag intermediate support T.
The socket 19 tapers toward its free end so that its
introduction into the opening 20 has practically a centering
effect.
As can further be noted from Fig. 2, the end edge is
beveled. It extends downward in the direction of the swing
shaft 14. A theoretical line extended in this direct~on
intersect3 the swing shaft, The connection point 22 is
located in the higher region of the end edge of the socket.
The socket 19 furthermore has advisedly a radial
curvature with respect to the shaft 14. The intermediate
support T has window-like openings between the base region of
the socket 19 and the region on the side of the swing shaft.
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The arm of the frame on the hinge side has, in this
connection, a larger width than the two arms of the frame
facing the broad sidewall Oe the housing.
On its free end, the intermediate support T forms at its
end there a freely accessible handle 24. It is an angular
extension on the bottom side. This extension come~ from a
reglon which is set back with respect to the end side 25
there. ~he corresponding leg extends vertically. The
ad~oining, substantially horizontal leg extends back to the
outer wall of the housing and terminates in the same plane as
the latter. In the region of the handle there ls a hook
detent device (not shown in detail) which can be actuated by
a push button and secures the closed condition of the
housing. The corresponding area of the motor housing 5 has a
niche-like reces~ to receive the handle 24. The reces~ bears
the reference number 26.
Upward-directed projections 27 extend also from the top
side ~in the position shown in Fig. 4) in the region of the
longer frame arms of the intermediate support. The
pro~ectlons close grip openings 28 on the longer side edges
of the fllter-bag bottom 17. ~oth grip openings 28 are
beveled and open toward the corresponding inner wall of the
chamber socket. In the open position of the housing 1, the
filter bag can be conveniently grasped by a clamping grip
around the central zone of the bottom 17 of the filter bag,
which zone ha-~ been constricted in the manner of a wasp's
waist, and then be lifted out of the chamber 6. The filter-
bag intermediate support T is furthermore so associated and
developed in this connection that it moves through a limited
angle of swlng, i.e. it cannot pass into the 180 angle
position of the chamber socket 12~ rather it remains in the
position which lies approximately in or beyond the vertical
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posltion E-E of the cross-sectional plane of the socket
connection, so that the socket connection V is already beyond
the bisector of the maximum region of swing of 180. In this
position, there is sufficient free space for the filter bag 7
in order to pull it off from the intermediate support. The
transfer into the position opposite the upside-down posltion,
i.e. with the opening 20 pointing upward, takes place without
it being possible for dust or larger particles to escape.
The filter bag can therefore be grasped conveniently and
lifted out in the above-described manner or after removal of
the chamber. The wall of the bag is not puched in. Its wall
need not be touched upon its removal; any blowing out is
eliminated. ~y stretching the bag a suction effect can at
most be produced. The insertion of a new filter bag is
possible ln very simple manner in the same way, since the
chamber is open toward the top over its entire cross-section
(see Pig. 1). It is therefore merely necessary now to swing
the chamber 6 back into the position shown in solid line in
Fig. 1, in which position the upper structure of the housing
1 compri~ing the chamber 6 is automatically locked on the
motor housing 5. Upon this swinging-back movement, the
opening 20 entraps the socket 19, or vice versa. Thi~ can
take place in the vertical position of the filter-bag
intermediate support T which is possibly still present by
frictional engagement or else only when the intermediate
support rests with its back again on the top side of the
motor housing S. In the closed position, the projections 27
again fill the grip openings 2a practically completely, i.e.
to suoh an extent that no outward bulges in the non-woven
type paper filter wall 31 can occur upon the inflating of the
filter bag or else due to the weight of the filling.
In order to enlarge the grip openings 28 which lie
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opposite each other, the wall region 12' of the inner wall of
the chamber socket 12, which lies in this direction and
therefore points outward, is hollowed out somewhat.
For a foolproof attachment of the filter bag 7 in proper
position, the bottom 17 of the latter ha~, in the region of
the two narrow sides, orient~tion feature~ 32 which engage in
mating feature~ 33 in the region of the inner wall of the
chamber socket 12, The orientation features consist of
trapezoidal projections on the narrow side of the plate-
shaped body forming the bottom 17. In this way there i9
obtained a properly aligned positioning of opening 20 and the
socket 19 before an improper attachment is noticed by a
comlng together of the housing parts which does not permit
closure. The facing longitudinal sides 27' of the
pro~ections 27 are rounded transversely, which also serves
properly to position the bottom 17. They act as guide
surfaces on the corre~ponding rounded base of the recess of
the grip openings 28. Tongues 31a, 32b and 32c are provided
in addltion at symmetrical angles to the opening 20. The
side-edge tongues 32b and 32c extend obliquely into the grip
openings. They are covered on their top side with a foam
material Sch which forms a sealing-ring zone of the hole 20.
The fold edges K of the wall (paper) of the filter bag held
against the bottom side of the bottom 17 intersect the grip
openings, and the tongues 32b and 32c extend over them.
The chamber or chamber socket 12 can be disengaged from
the swing ~haft 14, In this way, it is possible to carry the
chamber containing the full filter bag 7 conveniently to the
garbage pail or the like. Furthermore, the chamber 6 and the
textile bag 11 stiffened by a wire basket can be easily
cleaned from time to time without the entire apparatus being
attached to them.
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The connection point on the chamber-socket side is a
housing-like projection 12' formed thereon and extending into
the reglon of the shaft 14, the projection extending
pra¢tically in coincidence with the bearing lugs 15 fastened
on the houslng and the journal-pin bearing lugs 16 of the
filter-bag intermediate supp,ort T. The detent means are
formed by pins 50 which are under spring action with respect
to each other and in outward direction. The pins extend
beyond the end surface of the projection 12'. This
protruding section is developed as a beveled trap head 51.
The trap bevel bears the reference number 52. The trap heads
51 have a flattened cross-section and cooperate with the
journal-pln bearing lugs 16 of the intermediate support T
which lle in front of them. Each of these bearing lugs 16
forms an outwardly open radial slot 53. The radial slot 53
widens outward in funnel shape. The funnel shape favors a
centering on the shaft centerline but it also forms a run-on
flan~ 54 which cor~responds to the angle of inclination of the
trap bevel 52. The inverse end of the run-on flank 54 then
contlnues into a blocking shoulder 55 transverse thereto, the
back oE the trap bevel engaging under the shoulder in locking
manner. The blocking shoulder 55 is the partial wall region
of a receiving recess 56 for the trap head 51 of the journal-
pin bearing lugs 16. The narrawest width of the radial slot
53 corresponds to the flattened width of the trap heads 51.
The disengagement is only possible in the swung-down
position of the chamber socket 12 and with the support T
swung against the housing since the trap heads are then in
the ready-eor-disengagement position, as shown in Fig 12. To
be sure, in this position a further slight swinging of the
chamber socket must be efEected, since a partial region of
the top of the trap head 51 is still in slight blocking
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engagement with respect to the receiving recess 56. Once the
proper position for disengagement has been assumed, the
chamber socket need only be lifted upward. The trap bevel 52
which points upward in this position then runs over the
blocking shoulder 55. For the engagement, the run-on flank
54 of the radlal slot 53 proyes useful. It guides the trap
heads back against the force of the compression spring 57
acting on the pins 55.
The compression sprlng 57 is a helical compression
sprlng .
The pins 50 are secured against rotation. For this
purpose they are provided with longitudinal ribs 58 which
en~age in longitudinal grooves 59 of corresponding contour in
the recesse~ of the projections 12'. The inward directed
ends of the pins 50 have stops so that the pins SO do not
jump out of their housing despite the spring pressure.
In all other possible angular positions, the trap heads
51 assume a blocking position relative to the corresponding
journal-pin bearing lugs 16.
A different development o~ the swing-limiting stop for
the intermediate support T can be noted from Figs. 10 to 12,
to the extent that the journal-pin bearing lugs 16 come
against a shoulder 61 on the housing side by a radial stop
projection 60.
The shaft 14 proper is formed by stub shafts 14' of the
journal-pin bearing lugs 16, the stubs being formed in the
back of the receiving recess 56 for the trap head 51. They
extend into corresponding cavities in the bearing lugs 15 of
the housing.
The receiving recess 56 is enlarged in the manner of a
slot in the direction of the plane of extenslon of the
intermediate support T.
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A further feature of the intermediate support T
consists, in accordance with the version starting from Fig.
17, in providing the intermediate support T with an extrusion
U. Thi~ extrusion consists of somewhat softer material than
the intermediate support T. The extrusion extends at least
on the edge side, so that not only is the narrow end edge of
the plate-shaped intermediate support T covered but also the
top and bottom sides oE the intermediate support. The
flexlble material provides in this way an edge seal not only
between the bottom 17 of the filter bag 7 but also with
respect to the cover of the motor housing 5. Furthermore,
the material of the extrusion U is also extended into the
region oE the socket 19 of the intermediate support T,
surrounding thi~ socket 19 in jacket-like manner. The
corresponding change in the sides toward the top side of the
intermediate support is provided by an edge perforation in
the reglon of the base of the socket 19. The perforations
are designated 63 and can be noted from Fig. 22. In the
reglon of the base of the socket 19, facing the blower air
duct 8 located there, the extrusion forms a sealing lip 64
which extends into the stepped-down blower air duct. The
sealing llp 64 tapers in funnel-shape on the duct side.
The extrusion furthermore forms the above-described
projection~ 27 which extend into the grip opening~ 28 of the
bottom 17 of the filter bag. The relatively soft material
has at the same time sufficient flexibility so that no forced
coupling occurs. The projections 27 are formed of upwardly
bent off wall section~ of the extrusion material ~rubber or
plastic~, which wall sections have a curvature extending in
longitudinal direction or else terminate only at their ends
in curved sections, so that the desired standing ability is
present despite the softness.
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In order to increase the seal, the edge of the chamber
socket 12 on the filter-bottom side i~ pointed in the manner
of a cutting edge tsee Fig 4).
Furthermore the filter-bag bottom 17 is gripped over by
at least two projections 65 located on both sides Oe the
opening 20 in the bottom 17., As can be noted from Fig. 15,
the gripping width is rather small, so that the filter bag
can be lifted out by a deliberate pull on the bottom 17.
Zones free of extrusion are only taken into account in
the reqion of the emergence of the journal-pin bearing lugs
16 and in the region of the handle 25.
The oriflce edge of the opening 20 of the bottom 17 is
lined with an elastic layer 66 on the support side. This
layer extends around the opening 20 up to the periphery of
the bottom. It may be a foam material.
The extrusion U is utilized to form the valve flap 21.
It is a cover which extends over the mouth of the socket and
which is cut all around except at the hinge place 22.
The reference numbers have otherwise been applied by
analogy, without repeating the description.
All new features mentioned in the specification and
shown in the drawing are essential to the invention even if
they have not been especially set forth in the Claims.
