DE1516569B2 - DISPLAY AND SAFETY DEVICE ON A VACUUM CLEANER - Google Patents

Description

The invention relates to a display and safety device on a vacuum cleaner filter, which is in the Arranged inside the vacuum cleaner housing and upstream of the motor fan unit.

In a known device of this type, the vacuum cleaner filter opens as the blockage increases independently a valve through which the vacuum cleaner motor is additionally cooled and thus before from overheating. This device has the disadvantage that the operator cannot see it how far the dust accumulation of the filter has progressed and when the additional Air flow begins.

Numerous devices that indicate the accumulation of dust in vacuum cleaner filters are known; On a vacuum cleaner with an external filter bag, two different ones were already used Signals are provided through a communicating with the space on the pressure side of the vacuum cleaner fan standing bellows are triggered and when the permissible in this space is exceeded Maximum pressure can be seen in the fact that a signal arm in one that is visible through a peephole Warning position is pivoted or electrical warning lamps light up or be switched off. However, these devices do not protect the drive motor from overheating when the operator ignored the signal.

It is also already known in devices with a built-in fan, in particular vacuum cleaners, the for vacuuming and blowing serving drive motor whenever the dust bag or the Air inlet or outlet is clogged to supply a cooling air stream, by means of a Pressure relief valve on the pressure relief side and a vacuum valve on the negative pressure side, both of which are formed by spring flaps that rest on a hole in the housing wall and flow through of the cooling air flow either a vibratable tongue through vibrations an acoustic one Let give signal or are designed as contacts that generate an optical signal can.

In contrast, the invention is based on the object of providing a display and safety device to create the type mentioned at the beginning, which the increasing dust accumulation of the inside of the Vacuum cleaner housing arranged filter continuously and visually indicates the complete blockage of the Filters can be recognized by a combined visual and acoustic signal.

According to the invention, this object is achieved by an actuator that moves under the action of the Negative pressure due to the increasing accumulation of dust in the vacuum cleaner housing Filters in relation to the outside air is created, continuously shifted, thereby continuously and exposed to the indicates the respective dust accumulation of the filter and when the maximum permissible dust accumulation is reached releases an opening through which an additional air flow enters the vacuum cleaner housing, which a acoustic warning signal generated and bypassing the filter directly to the motor fan unit is fed.

With the invention, the advantage is achieved that the attention of the vacuum cleaner leading Person can concentrate fully on the cleaning to be carried out with this device without a Clogging of the vacuum cleaner filter needs to be feared, since the operator of the dust accumulation state this filter automatically appears and he points to a complete clogging of the same is alerted by a whistle. In the latter condition of the filter, the one Replacing the same becomes necessary, moreover, overheating of the continued working Fan motor prevented by a flow of cooling air,

ίο through the vacuum cleaner housing and around the filter flows around so that simultaneously with the delivery of an audible signal the vacuum cleaner motor an increased air flow is supplied, which contributes to its cooling. With this vacuum cleaner version It is also completely irrelevant for the operator of the vacuum cleaner whether the one to be cleaned Carpet, the furniture trains or curtains to be cleaned thick or thin and the one to be cleaned The floor is hard or soft, as this is all on the

zo the functioning of the safety device has no influence. - A further advantage of the inventive device is that it is inexpensive reliable _r of simple construction, operation and in the v 'manufacture.

Appropriately, the actuator consists of a displaceable in a bore and piston flow channels are provided that intersect the bore and one side of the piston with the part of the vacuum cleaner housing under vacuum and the other side of the piston with the Connect outside air.

Two exemplary embodiments of the invention are described in detail below with reference to the drawings explained. They show figures that mean the following:

F i g. 1 shows the side view of a vacuum cleaner of the container design with the inventive device located therein Display and safety device for showing internal construction details Vacuum cleaner parts have broken away,

F i g. FIG. 2 is an enlarged, fragmentary plan view of part of the FIG. 1, which shows the location of the display and safety device in the vacuum cleaner (<■ ,

F i g. 3 shows an enlarged and fragmentary section, essentially longitudinally Line 3-3 in FIG. 2 has been placed by the vacuum cleaner,

F i g. 4 is an enlarged view taken along line 4-4 of FIG. 3 cut through the facility,

F i g. 5 is a view taken substantially along line 5-5 of FIG. 4 section laid through the facility,
F i g. 6 shows a horizontal, essentially along line 6-6 of FIG. 4 section laid through the facility,

F i g. 7 shows a bottom view of a second display and safety device according to the invention, which suitable for use on the one shown in FIG. 1 vacuum cleaner shown is suitable,

F i g. 8 shows a longitudinal section through the in F i g. 7 _: reproduced display and safety device which reproduces this in a state installed in the vacuum cleaner of FIG. 1, Γ

Figures 9, 10 and 11 are cross-sections taken along the line; 9-9, 10-10 and 11-11 of FIG. 8 by the in this ■ The facility shown in the illustration has been placed; ■ are.

3 4

In Fig. 1, 11 denotes an airtight, roughly rectangular section and, as best shown in FIG. 3 and 5 too angular housing of a vacuum cleaner 10 is taken from the container, has over a larger part of its design with wheels 18 for the displaceable position length at the right end of the housing 52 an in tion of the housing in a generally horizontal vertical direction on elongated cross-section. The location on one level. The housing 11 is preferred 5 the latter has a downwardly offset wall part in two parts, the upper part at 65, which is connected to the lower left part of the Boh part with a sloping transition part 69 in the right end of the housing so that it can be opened up into the right end of the housing . To the vacuum cleaner in vertical tion 60 passes. Wall part 65 includes a vertical position to be able to set up, are on the right housing right standing center rib 66 (Fig. 3, 4 and 5), two lateral projections 22 are provided at the end, io their upper edge 67 in a straight line with the while the front end designed as a handle cuts off the lowest point of the bore 60 and that can be. In the right part of the housing in the piston 62 during its operational F i g. 1, a motor fan unit 30 is attached, sliding towards the right end 61 of the gear from a drive electric motor in the upper housing 52 carries. Through the offset wall part 65, the motor part 32 and one in the lower, with outlet opening 15 and the central rib 66, two elongated fan part 33 provided with openings 34 are arranged on the other parallel flow channels 68 (FIGS. 3 and 5). The motor fan unit formed around the housing 52, which extends from the transition-closing partial housing 37 through its inlet part 69 to the open end of the bore 60 opening 38 with the interior of the housing 11 and thereby communicates with the zone of low pressure . The path of the sucked in dust particles in the vacuum cleaner housing on the downstream air through the interior of the vacuum cleaner is shown in FIG. 1 are connected to the side of the filter 41 when indicated by arrows; the air enters when the motor fan unit 30 is in operation.
housing inlet 40, which flows through here through a In the bore 60 a coil spring 72 is a long, porous paper bag 41 formed and seen, one end of which on the end wall 64 of which emerges cleaned from this into the interior of the piston 62 and its the other end exits at a cup housing 11, then enters through the opening 38 into the shaped part-housing 37 arranged in the bore 60 above the rib 66, through which the motor fan-arranged support part 74 rests. For the in the following unit and the fan outlet openings 34 and the purpose described, the housing 52 flows through a provided in the lower part 16 predominantly of transparent thermoplastic chamber 44 the outlet openings 45 of the dust 30 material, e.g. B. Polystyrolpreßstoff, made what sucker too. The front-mounted foot lever bore 60, which serves to switch the support part 74 in the motor current on and off, by hot deformation of the housing 52, which enables the motor speed to be regulated at this point (76 in FIG. 6).
Regulator 47 (FLg. 2) and the vacuum regulator 48 attached to the upper part of the housing 12 by the appropriate design of the housing 52 do not represent any details essential to the invention and a hollow cap end attached to it.

The actuator through which the suction ducts formed, which form the outer surface 98 of the

Operators via the respective status of the dust piston 62 with the ambient air of the vacuum cleaner

enrichment of the filter 41 is continuously informed and the inner surface 73 of the same with the zone

and connect 40 low pressure behind the filter 41 in the event of clogging by a sound signal on it,

Attention is drawn, here represents a piston The piston is thereby with a through the

62 (Fig. 4), the inside of a force generated in the general difference between these two pressures

my elongated housing 52 is located, which acts on it depending on the size of the

the one-piece with a rectangular, as a support plate dust accumulation in the filter and therefore of the

for this housing serving plate part 53 formed 45 behind this generated negative pressure against the

is. When it is installed, the housing 52 is pushed towards the right-hand end of the housing by the pressure of the spring 72.

seeks to drive the elongated opening 51 of the upper housing part 12 housing 52 and thereby a display

through (Fig. 4 and 1, 3 and 5) into the housing 11 of the degree of dust accumulation in the filter 41

hung (see also Fig. 1) and on this through light. The understanding of what is going on is without precise

Screwing a plurality of screws 55 ö by ~ $ examination of the history of these currents

Go through holes in plate part 53, not possible in opposite channels.

standing cast warts 54 on the vacuum cleaner from Figure F i g. 4, which attaches the display and housing attached cover plate 49, so that the safety device reproduces at the moment in housing 52 in a zone of low pressure on which the piston 62 is under the action of the outlet side of the filter 41. For the avoidance of ₅₅ acts on him differential pressure against the vacuum losses at this vital point of the safety action of the spring 72 in its (in the figure with integral means between plate member 53 and overall solid lines reproduced is) rightmost häuseoberteil 12 around the edge of the opening 51 has withdrawn around the position in which it exposes a flow channel 82 provided in the sealing washer 57 (FIGS. 3, 4 and 5) housing 52. 60 it can be seen that the housing 52 with the cap through the housing 52 goes in the longitudinal direction of the part 84 is assembled so that its channel 82 has a bore 60 through it, which, as in the space 83 of the cap part above it 4 and 6, merges at its right end 6L. The cap part has two side walls86 opens. The long, pot-shaped (FIG. 5), an end wall 87, a top wall 88 and piston 62 are loosely inserted into this bore and two lateral extensions 90 (FIGS. 5 and 6) are continuously in it 65, which are shown in FIG movable. As the fig. 4, corresponding depressions 91 of the plate part 53 sit the bore 60 on a smaller part of it, to which the cap part 84 is fastened through the length at the left end of the housing 52 circular transverse screws 92. The one above the current

5 6

Channel 82 lying space 83 is with which the dust 11 enters. This additional air flow is supplied under the surrounding air through two sides of the filter 41 directly to the motor fan 30, which is spaced apart and running in the longitudinal direction, and generates an acoustic sound generator by means of flow channels 93 (FIGS. 3 and 5) in connection Warning the signs of the side walls 86 of the cap part and 5, the formation of which is to be discussed in the following one raised, elongated part 94 of the pedestrian,
housing 52 (FIG. 6). As the fig. 4 The sound generating device can be seen from the embodiment in which the cap part 84 has a tongue 102, the housing part 94 and the opening 51 already existing in front of one end on the underside of the cap part 84. The cross-section is strengthened and the other end 108 is tightly cut across the flow channels 93 through two recesses 96 (FIGS. 3 to 6) running longitudinally to the edge of a raised, U-shaped flange in the 104, which is located around the periphery of the housing part 94, the upper end face of the plate part 53 is enlarged, extends around. As shown in FIG. 3 and 4, the outer ends of the channels 93 project over the upper edge of the flange 104 over a space 85 between the upper housing part 12 and the 15 considerable part of its length, close to the cover plate 49 mentioned above (FIG. 5 ) Underside of the tongue 102 and then goes from and from this through a along the rearward outer end 108 of the tongue gradually downward, term or, in the sense of FIG. 1, right-hand side. Thus, the outer end of the tongue 102 can swing longitudinally extending freely along the edge of the pressure plate 49, and the tongue 102 and the flange 104 can communicate with the outside air. 20 define an elongated flow channel 112, the

The front end face 98 of the piston 62 is a branch channel of the housing 52 penetrating through it

thus represents the flow channels 93, the space 83 and the channel system.

the flow channel 82 with air from atmospheric. One traces the path that the air takes through the Geschem Pressure in connection. At the intersection of the housing 52 through to the interior of the vacuum cleaner flow channel 82 with the bore 60 shares 25 housing 11 increases when the piston 62 is in its as a result of the configuration explained in the foregoing is the extreme right position, it can be seen that of the housing 52 of this housing flowing through the flow channels 93, 112, 82 and 68 upstream air flow in two parts: One part flows through the downward direction from its point of intersection with the bore 60 the required piston play because of between the tone generating device 102 a minor superior and the lower side of the piston 62 and the end 30; only channel 112 goes over this Bore 60 left free space and flows over the sound generating device during the front face 98 of the piston away, while other channel 93, which has a much larger transverse second portion cut generally across bore 60 as channel 112 has, shunted and around the outer periphery of the side wall 63 of this route. The piston to the inside of the vacuum cleaner 62 flows around. At which air of atmospheric pressure flowing in the foregoing 35 flows The transition part 69 mentioned above meet these two parts when the channel 82 is exposed in the area shown in FIG. 4th together and unite there with the position of the piston 62 according to flow channels shown in the flow direction 68. The channels 93 and 112 flow in the cap part 84

The inner surface 73 of the piston end wall 64 projects through the channel 82 into the bore 60, from there to

through the bore 60 and at the open end 61 40 the left ends of the flow channels 68 at the over-

this bore existing flow channels 68 gang part 69 and along these channels after

(see Figs. 4 and 5) with the zone of low pressure inside the housing 11. It therefore flows when the

behind the filter 41 in connection. laying of the channel 82 significantly more air than up to

The under the differential pressure between outside air then through the flow channel 112, which in doing so

and the low pressure zone in the vacuum cleaner housing 45 is the free, vibratory end 108 of the tongue

Standing piston 62 therefore moves when dust 102 walks around. This turns the tongue 102 into

suck out of its in-oscillation when the filter 41 is not clogged, and the acoustic signal sounds

taken, in Fig. 4 with dashed lines warning sign that the vacuum cleaner operator

indicated the left starting position continuously and indicates that the filter 41 is clogged and

continuously in accordance with the gradually increasing 50 must be changed.

Menden dust accumulation of the filter against the die shown in FIGS. 7 to 11, in general

Pressure of the spring 72 to the right, and each of these with the reference number 120 designated second embodiment

Piston positions can be determined by an opening or a form of the display and safety device

Window 99 therethrough (FIG. 4), which over a part of the has several parts with the in FIG. 1 to 6 shown

opening 51 and the left (transparent) part of the device in common, which is why in the former

Housing 52 lies, to be observed, a display, figures for identical parts have the same reference

which are still used by placing numbers underneath the housing 52 as in the last-mentioned figures

a layer 101 reflective or glossy.

Materials can be made more noticeable. While the display and safety device points here

of vacuuming is always an indication of the 60 an elongated tubular pipe similar to the housing 52

momentary enrichment state of the dust migcs housing 122, which with a

suction filter 41 available. lumpy, raised and generally right

When reaching the maximum permissible dust-angled base plate 123 on the underside of the cover reeving of the filter 41 is the piston 62 as a result of the wall 12 of the vacuum cleaner housing 11 is mounted. The strong negative pressure created by the flow 65 It lies with its one (left) part under one in the channel 82 free (Fig. 4), whereby the lower end of the generally rectangular opening 125 in this cover panes is no longer narrowed by it and therefore writhed and is kept transparent so that its an additional air flow into the interior of the vacuum cleaner housing with that in a housing longitudinal bore

movably guided, opaque held pistons serving to display dust accumulation through an opening 99 with sight glass 100 in the cover plate 49 serving for attachment and through a transparent plate 126 through which is arranged between housing 122 and vacuum cleaner housing cover wall 12 is observable from the outside.

Like the housing 52 of the first embodiment discussed, the housing 122 is also made of a Longitudinal bore penetrates (132), which, in the representation of FIG. 8 seen, on the right End 133 of the same opens. In this longitudinal bore, an elongated, cup-shaped one can slide and with play Piston 134 with cylindrical side wall 136 and left-hand piston head 137 inserted into the one likewise cup-shaped, but with its one, radially widened end 142 firmly in the housing mounted spring holder 138 engages. Between the guide part 143 of this spring holder and the piston side wall 136 a helical spring 144 is arranged with little radial play on both sides, which tends to move the piston 134 continuously to the left.

The internal structure of the housing 122 corresponds to the wall section 65 offset downwards, the transition part 69 to the right-hand bore end 133 and those arranged on both sides of the central rib 66 Flow channels 68, which are connected to the low pressure zone in the vacuum cleaner housing 11 largely the structure of the housing 52.

As flow channels that cut the housing bore and one side of the dust accumulation indicating piston with the part of the vacuum cleaner housing 11 that is under negative pressure and connect the other side of the same to the outside air, creating a differential pressure on the Exercise piston, this against the pressure of the spring 144 according to the dust accumulation in the Filter shifts to the right, here are the flow channels 127, which through an opening in the transparent plate 126 is formed, 156, which is provided by a perpendicular under this opening Opening of the bore wall is shown, and 152 is provided, the one on the left-hand side The end of the bore 132 forms a slot arranged in the wall thereof (see FIGS. 8 and 11). Of the The latter channel stands through the chamber 153 between the cylindrical part of the housing 122 and the transparent plate 126, the openings 127 and 125 in this plate or the vacuum cleaner housing cover wall 12 and the slot 97 in the rear edge of the cover plate 49 (see FIG. 1) with the Outside air in connection. These close upstream of their intersection with the bore 132 Flow channels two branch channels 127 and 152 to 154, one of which, 127, with the in the hole wall 153 provided opening 156 is connected, while the other branch channel, namely the entirety of the channels 152 to 154, one the Opening 156 forms bypassing the bypass path.

So has the filter 41 reached its maximum permissible dust accumulation and has during his Display period, piston 134 moved to the right releases opening 156, thus causing the air flow, which was previously on its way from the outside air to the zone of low pressure in the vacuum cleaner housing the narrow annular space between the cylinder side wall

For this purpose, 1 sheet of drawings and hole 132 had to flow through, as a result the sudden increase in cross-section of the path available to him and that of him considerable acceleration and the flow through the chamber 153 and the with the opening 127 aligned with the opening 156 a whistling sound.

Claim 1 only protects the overall combination of the features it contains.

Claims (5)

Patent claims: 1. Display and safety device on a vacuum cleaner filter that is inside the vacuum cleaner housing arranged and the motor fan unit is connected upstream, marked t d u r c h an actuator (62 or 134), which is under the effect of the negative pressure, which as a result the increasing dust accumulation of the filter (41) in the vacuum cleaner housing (11) compared to the Outside air is created, continuously shifted, thereby continuously and uninterruptedly the respective Dust accumulation of the filter (41) indicates and when the highest permissible dust accumulation is reached an opening (82 or 156) releases through which an additional air flow into the Vacuum cleaner housing (11) enters, which generates an acoustic warning sign and bypassing of the filter (41) is fed directly to the motor fan unit (30). 2. Device according to claim 1, characterized in that the actuator consists of an in a bore (60 or 132) displaceable piston (62 or 134) and that flow channels (93,112, 82, 68 or 127,152,156, 68) are provided that intersect the bore and one side of the piston with the part of the vacuum cleaner housing which is under negative pressure (11) and connect the other side of the piston to the outside air. 3. Device according to claim 2, characterized in that the flow channels (93, 112, 82, 68 or 127, 152, 156, 68) upstream of their intersection (82 or 156) with the bore (60 and 132, respectively) include two branch channels (93, 112 and 127, 152 to 154, respectively) of which one (112 or 127) is connected to a sound generating device, while the other (93 or 152 to 154) forms a shunt path bypassing the tone generator. 4. Device according to claim 3, characterized in that on the housing (52) of the Device a hollow cap part (84) is placed, which part of the flow channels (93, 112, 82) and as a sound generating device carries a tongue (102) which is attached to the underside of the Cap part (84) is attached and in which a branch channel (112) is located. 5. Device according to claim 2, characterized in that the piston (134) receiving Bore (132) has an opening (156) which the piston (134) releases when the Filter reached the maximum permissible dust accumulation, whereby another, at a distance to first opening (156) standing and aligned with it opening (127) and through a chamber (153) located between the two openings first opening caused a whistling sound as a result of the air flowing through. 109 547/51