DE625683C - Device for displaying the incorrect operation of vacuum cleaners - Google Patents

Description

Bfbliotheak
Bur. Ind. Eigenendoin.
• Π MRI. 1936

ISSUED ON FEBRUARY 13, 1936

REICHSPATENTAMT "

PATENT LETTERING

M 625683
CLASS 34 c GROUP 5 ₇ o

Hans Dörfler in Vienna
Facility for. Indication of the failure of vacuum cleaners

Patented in the German Empire on January 8, 1935

The invention relates to a device for displaying the faulty operation of vacuum cleaners, and consists in that an acoustic signaling member, preferably a reed whistle, is arranged in such a way that it is sucked in from the outside air by a secondary air flow parallel to the main suction air flow is moved when the negative pressure in the suction channel falls below a predetermined level.

As is known, the suction effect of vacuum cleaners decreases with increasing dust cover on the loaded side of the dust bag and gradually sinks to one for the effective Dust removal is no longer sufficient. But the operator is not possible to gain certainty while working with the vacuum cleaner, whether the suction power has already dropped that far.

that the dust is no longer effectively extracted. Because also z. B. feeling the Dust bag, if it is accessible, - offers no reliable guarantee because the one at the Suction nozzle effective negative pressure not only λ'οη the amount of dust sucked in. but also depends on whether the dust is a dense or loose layer on the bag wall forms.

It is true that one has tried to remedy this problem by means of institutions the vacuum, which is reduced by the dust deposit on the dust bag, is used for an indication, but are the known ones Facilities involved and expensive.

These disadvantages are avoided by the subject matter of the invention. According to the invention the entry of the too weak induced draft through an acoustically acting device displayed, which is not only extremely easy to execute and therefore very causes low costs, but can also be retrofitted to any vacuum cleaner by simply placing it on the suction tube can be. The according to the invention However, the facility also has the further advantage that it does not require any special observation (such as, for example, sight glasses) requires, but that, because it is based on the output of a tone, it automatically draws attention to it, that the induced draft is too low for effective dedusting. The submission of the acoustic sign is not only made when the wall of the staubiackes has become too impermeable, but also when z. B. the suction nozzle as a result of incorrect Laying on the to be dedusted

Claims (3)

Object allows secondary air to enter and. through this the suction pressure at the point to be vacuumed, even when the dust bag is completely empty is lowered too much. The. Operations person becomes so by delivering the acoustic Immediately causes the nozzle to guide the nozzle correctly. In the same way, however, there is also an indication when the negative pressure on the to suction nozzle in another way, e.g. B. by the Entry of secondary air in the leaking or damaged metal or rubber hose is reduced. The subject of the invention is illustrated in an exemplary embodiment in the drawing, namely show: Fig. Ι a longitudinal section through part of the suction tube and the arranged on this Display device, ao Fig. 2 shows a cross section through both parts along line H-II of Fig. 1, 3 shows a somewhat modified embodiment, 4 shows the suction pipe with the display device arranged at an appropriate point of the same in front view. A short annular sleeve 2 is pushed tightly over the suction pipe. Suction tube and sleeve each have a z. B. circular opening. 3 and 4, both are brought to overlap with each other. In the arranged on the sleeve 2, With the exception of one or more openings 5 closed housing 6 is a tongue spring 7 provided, which is attached at one end 8 to a hollow body 9 that it is at rest Condition of the gap made in the latter ι ο loosely covering. Through one through the adjusting screw 13 leading to the housing 6 can be the deflection of the swinging tongue spring 7 can be limited as required. By rotating the sleeve 2 with respect to the suction pipe r the overlap of the openings 3 and 4 of both parts can be canceled. the Rotation of the sleeve 2 against the suction. tube ι is expediently through a the latter attached pin 11 limited, the protrudes into a slot 12 of the sleeve 2. The display device can be at any point on the suction tube, but also at be arranged in an otherwise suitable location between the suction nozzle and the dust bag which is practically the same negative pressure as in the suction nozzle. According to FIG. 3, the closed sleeve 2 can also be provided with two resilient ones, encompassing the suction tube Clamping jaws Γ4 must be replaced. This makes it possible to set up in easy way to put it from the ropes on the suction pipe. Of course but the reed pipe housing 6 can also be fixed and non-rotatable on the suction pipe or be attached to one of the other named locations. ... - The mode of operation of the device is as follows: By in the suction pipe 1 at V work. Of the vacuum cleaner Outside air is negative pressure through the opening 5 of the housing 6 and the openings 4 and 3 of the sleeve 2 and suction tube 1, respectively. When flowing past the edges of the tongue spring 7, this brings air flow the spring in the manner of a reed pipe (like the harmonica) in rapid oscillations, so that a continuous tone is produced. By means of the adjusting screw 13 can now the oscillation amplitude of the tongue spring 7 can be limited so that the latter at the greatest Induced draft (if the dust bag is still free of dust or if the suction nozzle is fully applied) vibrate and therefore cannot produce a sound, and only sounds when the induced draft has decreased by a certain amount and the spring is no longer through the adjusting screw is inhibited in movement. By adjusting the screw 13 accordingly, you have it in your hand. the sounding at an arbitrary, predetermined value of the reduced induced draft ■ to enter, the one more or corresponds to less strong filling of the dust bag or then arises in the suction tube, if If the nozzle is not fully seated, secondary air can get into the pipe. The amount of secondary air flowing into the intake manifold through the display device is due to the very small dimensions that the tongue spring needs to maintain, im. relationship vanishingly small to the dust-promoting suction air volume .. In addition, secondary air occurs only through the acoustic device when the vacuum cleaner is overcrowded the dust bag or as a result of incorrect nozzle placement works unsatisfactorily: The - inlet this air is therefore in the operation of the vacuum cleaner without any disadvantageous Meaning. Pat ent α ν s ρ i for c ξ ε: ι. Device for indicating the incorrect operation of vacuum cleaners, characterized in that a member giving an acoustic signal, preferably a reed whistle (γ, 9), is arranged in such a way that it is moved by a secondary air stream drawn in from the outside air parallel to the main suction air stream, when the Negative pressure in the suction channel falls below a predetermined level. 2. Device according to claim 1, characterized characterized that the Schwin- The deflection of the tongue (7) is preferably adjustable by means of an adjusting screw (13) is. 3. Device according to claim 1 and 2, characterized in that a the Reed whistle (7, 9) containing, preferably on one of the suction tube (1) slotted sleeve (2) arranged housing (6) "opposite an opening (3) provided in the suction tube (r) for the purpose of Turning off the acoustic device is designed to be rotatable. 1 sheet of drawings BERUN, PRINTED IN * ΠΕΙΪ