US2203171A - Suction cleaner - Google Patents

Description

June 4,' 1940.

E, F. MARTINET 1 sucIjIQN CLEANER Fned nay a, 195e A:s sheets-sheet 1 June 4, 1940. E F. MARTINET 2,203,171 ysuenen cmmwn Fiied lay a. '193s s sheets-sheet 2 I June 41940. E. F. MARTlNET v v `2,203,171

SUCIIION CLEANER Filed May e, 1956 s sheets-sheet 5 V /y/Q/ am l5 l 5250 u 51 v17- ZI f. 14 j l if@ a @WMA/ffm Ptentecl June 4, 1940 PATENT OFFICE sUc'r1oN` CLEANER.

Eugene F. Martinet, Cleveland, Ohio, assignor to The 'P. A. Geier Company, Cleveland, Ohio, a

corporation of Ohio Application May 8, 1936, Serial No. 78,624

2 Claims. A(Cl. 15-16) l The invention relates to suction cleaners hav, ing automatic means for signaling the degree of suction or pressure of the suction air passing through the-ducts or passages of the cleaner, and

5 which degree of `suction or pressure varies during use of the cleaner because of a number of different conditions, and the present inventiony includes improvements of the invention set forth in my prior U. S. Letters Patent No. 2,120,011 for Suction cleaners, filed April 11, 1936.

In said Patent No. 2,120,011 is set forth automatic signal means associated with a ksuction cleaner and operative to indicate to the user the attainment or non-attainment of a particul5 lar degree of suction or sub-atmospheric pres.

- sure of the suction air associated with a proper adjustment and location of the nozzle mouth of the cleaner with respect to the surface to be cleaned'for providing a predetermined proper or optimum cleaning action of the cleaner.

For example, in a usual portable suction cleaner of a type particularly set forth herein and in said application Serial No. 73,868, when the nozzle is wide open and not adjusted in proper location with respect to a surface to be cleaned, -the 'degree of suction or sub-atmospheric pressure in the nozzle passage or duct may be 1" of water, as measurable by a watermanometer.

When using such a cleaner having nozzle adjusting means such as particularly set forth herein and in said Patent No." 2,120,011, the design of the cleaner may be such that when, by manipulation of the nozzle adjusting meansthe degree of suction' or sub-atmospheric pressure becomes 3 of water in the nozzle passage or duct,

the suction will then be sufficient so that if the cleaner is operating over a rug, the portion 0f the rug immediately below the nozzle entrance mouth will be partially sucked. up into the entrance mouth, whereupon if the cleaner is new and the dust bag is new and clean the degreel of suction or sub-atmospheric pressure in the nozzle passage or duct may become for example 6" of Water. l

A similar change in the degree of suction or sub-atmospheric pressure inthe nozzle passage occurs during adjustment of the nozzle when operating over other types of surfaces, such as wood,

linoleum, tile, or the like.

When such a cleaner as particularly set forth herein vand in said Patent No. 2,120,011 is provided. with automatic means for signaling the attainment or non-attainment of a particular degree of suction or subatmospheric pressure of the suction air associated with a proper adjustment of the nozzle mouth of the cleaner with resect to the surface to vbe cleaned, the signaling means may be arrangedv to operate, for example to indicate the attainment or non-attainment of a sub-atmospheric pressure of 3 of water in the 5 nozzle passage or duct which as above indicated is sumcient to permit sucking up of portions of a rug or carpet being cleaned partially into the nozzle entrance mouth so that the degree of suction or sub-atmospheric pressure in the nozzle `10 mouth may then immediately become 6" of water as aforesaid.

In addition to changes Vin the degree of suction or sub-atmospheric pressure in the ducts of the cleaner, dueto changes in therrelative ll5 position of the nozzle entrance mouth with respect to the surface to be cleaned, the degree of suction or sub-atmospheric pressure in the ducts varies, in a cleaner having a dust bag for receiving the dust and dirt laden air discharged 20 by the cleaner, as the dust bag becomes filled with an accumulation of dust, dirt, and foreign matter during use of the cleaner.

Upon first placing a new cleaner into use, the interstices of the dust bag become partially lled 25 with a certain quantity of fine dust which remains there during the life of the cleaner, and consequently the maximum suction or lowest sub-atmospheric pressure coincident with a dust bag in use, after being cleaned in the usual man- 30 ner by emptying the contents thereof and with proper nozzle adjustment, may be about 5" o! water in the nozzle passage or duct.

Filling up of the dust bag, with dust, dirt, and foreign matter during use of the cleaner ob- 35 viously gradually increases the back pressure of the dust bag and gradually reduces the suction or raises the sub-atmospheric pressure in the nozzle nally to a condition at which no cleaning may be effected. 40

It is accordingly desirable that a suction cleaner having a dust bag be provided with automatic signal means for indicatingA the attainment or non-attainment or in other words the existence or non-existence of a particular degree of reduced suction or increase in sub-atmospheric pressure in the nozzle passage caused by the accumulation of dust and dirt in the dust bag, and the attainment of which calls for a cleaning out ofthe dust bag. 50

It is also desirable that a cleaner having automatic signal means for indicating when the dust bag should be cleaned, may likewise have independent automatic signal means for indicating the attainment of proper adjustment of the noz- 55- Adirt laden air discharged by the cleaner, and

in which when the dust bag is properly cleaned the degree of suction .or sub-atmospheric pressure in the suction passage may attain a predetermined range such as from 6" to 4 of water, which suction range may be termed the optimum cleaning suction of the cleaner, and the cleaner also having automatic signal means indicating when the degree of suction or sub-atmospheric pressure in the suction passage becomes for example less than 4" of water or in other wordsI varies a. predetermined amount from the optimum cleaning suction.

From another standpoint the objects of the present invention include the provision of suction cleaning apparatus in which automatic signal means are arranged to indicate the existence or non-existence of two separate particular degrees of suction or pressure of the air passing through the ducts or passages of the cleaner, one of which signal means operates for example to indicate in a cleaner having a dust bag when the dust bay should be cleaned, and the other signal means being arranged to operate for example in a cleaner having an adjustable nozzle when the proper adjustment of the nozzle has been attained.

The foregoing and other objects are attained by the suction cleaner, apparatus, parts, improvements, combinations, and sub-combinations, which comprise the present invention; and the nature of which is set forth in the following general statements; and preferred embodiments of which, together with their mode of use are set forth in the following description; and which are particularly and distinctly pointed out and set forth in the appended claims forming part hereof.

The nature of the improvements of the present invention may be described in general terms as including preferably in a portable suction cleaner having nozzle adjusting means, ducts communicating with each other and preferably including a nozzle and a discharge neck and a fan chamber between the nozzle and the discharge neck, a fan operative in the fan chamber for causing a flow of suction air into the nozzle through the fan chamber and out of the discharge neck, a dust bag connected with the discharge neck so as to lter the dust and dirt laden air discharged by the cleaner, the cleaner being arranged for optimum cleaning action at a predetermined particular degree of suction in the nozzle passage.

Two different signaling means are preferably provided, the first signal means being operative for indicating the attainment of a irst` particular degree of suction or optimum cleaning suction in the nozzle passage by proper nozzle adjustment and the non-attainment of such first particular degree of suction, and the second signal means being operative for indicating the existence or non-existence of a second particular degree of suction in the nozzle passage different from the first particular degree of suction, the

tablished so that when its signal means indicates its non-existence, there is an accumulation of dust and dirt in the dust bay, and there is indicated to the user thatk the dust bag should be cleaned.

Each signal means may preferably include light emitting means, the light from the one being a different color ,than the light from the other. and each signal may indicate the existence of its particular degree of suction or sub-atmospheric pressure by having the light emission shut oi! during operation of the sweeper, with proper adjustment oi' the nozzle thereof, and with a sufciently clean dust bag.

Light may be emitted by both signaling means during adjustment of the nozzle, and after proper adjustment ofthe nozzle the emission of light by either signal means may indicate a new condition of improper adjustment for the nozzle on the one hand, and the necessity of cleaning the dust bag on the other hand.

By way of example, one embodimentv of the present improvements is illustrated in the accompanying drawings forming part hereof, in which v v Figure 1 is a perspective view of an electric motor operated, portable suction cleaner with nozzle adjusting means and having a fan for.

creating the suction and a power driven rotary brush, and including one embodiment of the present improvements in the form of two separate visual signal means each automatically operated by variations from its own particular degree of suction or sub-atmospheric pressure existing in the nozzle of the cleaner;

Fig. 2, a fragmentary sectional view thereof transversely of the nozzle as on line 2 2, Fig. 4, showing the parts of one of the signal means and the operating means therefor in their relative positions when emitting and indicating colored light, as shown for the purpose of indicating that the dust bag should be cleaned; a

Fig. 3, a fragmentary plan sectional view thereof as on line 3-3, Fig. 2;

Fig. 4, a fragmentary top plan view of the cleaner;

Fig. 5, another fragmentary transverse lsectional view of the cleaner as on line 5 5, Fig. 4, showing the relative positions of the two signal means and the operating means therefor when in the sweeper shown the dust bag is properly the figure. the signal means and signal operating v means likewise being shown in their relative positions for indicating that the suction of the air i passing through the cleaner is not that which is associated with the proper adjustment of the nozzle mouth thereof; and I Fig. 7, a view similar to Fig. 6, and in which the nozzle mouth adjusting means of the cleaner have been properly adjusted so that a maximum Oroptimum cleaning action will occur by the nozzle mouth on the surfacel of the nap rug shown in the figure, and the signal operating means being shown in their relative positions of the proper adjustment of the nozzle mouth.

which they attain instantly upon the effecting 7)"5vaaosnn Similar numerals .refer to similar parts throughout the several figures of the drawings.

An electrically foperated portable suction cleaner with a poweri driven rotary brush in the nozzle chamber thereof and with a headlight, and provided with one embodiment of the present improvements is shown in the drawings and is indicated generally by III.

The suction cleaner I0 includes a motor II in a motor housing I2, associated with a fan housing I3 having a fan I4 secured on the motor shaft in the fan chamber I3-I of the fan housing I3, and a suction nozzle I5 communicates with the fan housing. An operating handle I6, and a dust bag I1 connected with the exhaust opening or neck I3--2 of the fan housing I3 also are provided for the cleaner; andthe motor housing I2, the fan housing I3, and nozzle I5 are mounted on front casters I3 and preferably 'on adjustable double rear caster means I8 for ambulant motion over a surface to be cleaned, as shown a nap rug 28. The cleaner I0 also is provided with headlight means indicated generally by 2I.

'Ihe nozzle I5 includes walls forming a tubular neck 22 leading to the fan chamber I3-I, and a transversely elongated brush housing suction mouth 23. A rotary brush indicated generally by 24 and provided with bristles 25 is detachably and adjustably rotatably mounted in the suction mouth 23, as by means such as set forth in detail in my copending.application Serial No. 692,482. y

'I'he brush 24 is preferably motor driven, as shown in the drawings, and for this purpose an endless preferably fiat band rubber belt 26 passes over the brush pulley surface 21 and the end 28 of the motor shaft.

As shown, the nozzle I5 is provided at the entrance to its mouth with a nozzle lip plate 29.

The headlight means indicated generally by 2|, as shown include in the nozzle housing, an upper centrally located forwardly opening headlight shield 30 within the chamber 3I of which is operatively mounted an electric headlight 32 which is associated with the source of power for the motor, the headlight 32 being lighted when they motor and fan are in operation. I

In the illustrated embodiment of the present improvements, the headlight 32 and its shield 30 comprise part of two visual signal `means* which also include light transmitting elements` or lenses 33-R and 33-G, each of which as shown is contained in the upper end of a mounting tube 34 which is screwed in a. suitable aperture in the top of the headlight shield 30.

The present improvements also include separate means for automatically operating each signal meansA and actuated by variations in the suction or pressure existing in the cleaner air passages.

As shown, the signal operating means are indicated generally by 35-R and 35-G, and each includes a cylinder tube 36 arranged in a suitable boreformed in some of the walls of the nozzle I5, the lower end of the bore 31 of each cylinder sleeve 36 opening to the atmosphere and the upper end of each cylinder sleeve 36 having a notch 38 therein which registers with an opening 39 in one of the walls of the nozzle and provides a communication between the upsleeve 36. l

nozzle which communicates with the fan chamber I3.

A piston disk 4I is arranged for reciprocation in the bore 31 of each cylinder sleeve 36 and means such as a stop pin 42 prevent each piston disk 4I from dropping out of its cylinder A signal operating piston rod 43 has its lower end connected to each piston disk 4I and exf tends upwardly through a suitable aperture formed in the bottom wall 44 of the headlight shield 38, said bottom wall 44 comprising a top wall of the nozzle I5.

Upon the upper end of each piston rod 43 is loosely mounted a shutter disk 45 as by a screw 46, the shank of which passes through an enlarged central opening in the shutter disk 45 and isscrewed in a suitable threaded aperture in the upper end of its piston rod 43.

The lower transversely elongated extremity of the nozzle. I5 may be termed the entrance .mouth 410i the nozzle, and the cleaner I0 is provided with the adjustable double rearv caster means I9 for adjusting the relative location of the nozzle entrancemouth with respect to the surface being cleaned such as the nap rug 20; and as shown, the rear caster adjusting means includes arm members 48 pivotally secured at one end to rear end portions 49 of the motor housing I2, as by the transverse Din 5I).

The arm members 48 also include a transverse bar 5I and as shown spring means 52 are wrapped around the pivot pin 50, and the ends of the spring means 52 cooperate respectively against portions of the motor housing I2 and against the transverse bar 5I for urging, the arm members 48 upwardly.

The adjustable caster means I9 furthermore include casters 53 mounted upon suitable shaft means at the outer end of the arm members 48, and an adjusting screw 54 is provided at its upper end with a knurled head 55 and is screwedV into a suitably threaded aperture 56 formed in a boss 51 provided in an upper rear end wall 58 of the motor housing I2.

The lower end of the screw 54 abuts against the bar 5I of the arm members'48, and accordingly screwing the screw 54 downwardly serves to increase the angulation of the arm members 48 with respect to the axis 59 of the motor shaft 60 and thereby serves to lower vthe entrance mouth 41 of the nozzle towards the surface 20 to be cleaned, with the reverse action of the adjusting means when the screw 54 is screwed upwardly.

In the operation of the adjustable caster means I9 all the sweeper parts, with the exception of the front casters I8 and their axle 6I, swing one way orthe other on the axle 6I.

Forthe purposes of the present improvements in the signal operating means 35-G, the piston disk 4I, the rod 4 3 thereof, and the shutter disk 45, and screw 46 thereon, are heavier than the similar parts of the signal operating means 35-R.

Also as indicated 4on the drawings, the light transmitting lens 33-R is made of red glass, and

the light transmitting lens 33- G is made of green glass. f l

'I'he operation of the improved suction cleaner III may be described as follows: l

The manufacturer of a cleaner, such as the cleaner III, determines and establishes, in designing the same, a first particular .degree of lsuction or sub-atmospheric pressure, or in otherwords, a drop from atmospheric pressure of the air existing in the cleaner nomi/e I3 or Vother es on the low pressure side ot the fan. which is coincident with the correct adjustment of the entrance mouth 41 of the nozzle with respect to the surface l to be cleaned, which is in the drawings the nap rug 2li;- so that a maximum or predetermined or optimum cleaning action will occur in using such particular design of cleaner with its nozzle mouth correctlyv adjusted.

Inv Fig. 'lthe relationship of the nap rug 20 when the nozzle entrance mouth 41 is properly adjusted, is shown, the adjusting means I9 having been manually manipulated to attain the correct position of the nozzle entrance mouth 41 as'shown.

In Fig. 6 the adjusting means I9 are shown in a position in which there is no proper relationship of the nozzle'entrancemouth 41 with the nap rug v2li to accomplish any eiective cleaning. f

The manufacturer. having determined the ilrst particular degree of suction coincident with the proper adjustment of the nozzle entrance mouth to eiect a maximuml predetermined cleaning action, then so designs the signal operating means that it will operate a signal the instant that the iirst particular degree of suction or pressure has been obtained in the cleaner passage with which the signal operating means communicates, to indicate when proper adjustment of the nozzle entrance mouth has been obtained.

Thus, in the embodiments shown in the drawings, in the signal operating means 35-R the weight and area of the signal operating piston disk 4| tting and reciprocating in the bore 31 of the cylinder sleeve 36is so established or determined by the particular characteristics of the cleaner on which it is mounted, that when the proper adjustment of the nozzle entrance mouth 41 is eiected with respect to any surface to be cleaned to obtain a maximum or optimum predetermined cleaning eect, the suction within the chamber of the nozzle will have been increased to such a first particular degree that atmospheric pressure on the piston disk 4| will elevate the same and the piston rod 43 to their positions shown in Fig. 7, with respect to the lens 33-R.

As above stated the cleaner I is of the headlight type, and the headlight 32 is at all times illuminated when the cleaner is in operation. When there is no proper adjustment of the nozzle entrance mouth 41, the piston disk 4| and rod 43 are dropped in the positions shown in Fig. 6 in which case light from the headlights 32 is transmitted through the red light transmitting signal lens 33R which appears illuminated to the user oi' the cleaner I0 at all times when there is no `proper adjustment of the cleaner nozzle entrance mouth 41.' Y At the instant however that proper adjustment :of thenozzle entrance mouth 41 ls effected as shown in Fig. '7 the shutter disk 45 for the lens The improved cleaner I0 operates automatically to provide instantaneous signaling of the rattainment of a iirst particular degree of suction'V in the nozzle associated with a proper adjustment or location of the nozzle with relationto any surfacetojbe cleaned to obtain the maximumor optimum predetermined cleaning effect.

When the user is adjusting the location of the nozzle mouth for any particular surface, the screw I4 is manipulated with one hand so as to swing the sweeper parts about the iront caster axle 8| to a position of too great displacement oi the nozzle entrance mouthV 41 above the surface to be cleaned (Fig. 6).

The screw is then manipulated in the other direction to lower the nozzle entrance mouth 41. in order to eilect a proper adjustment (Fig. 7).

The instant the light emitting from the signal lens 33-R shuts oil, theuser knows that proper adjustment' oi the nozzle entrance mouth 41 has been eiected.

'I'he design of the sweeper I0 may be such that when using the sweeper over a rug 20, the attainment of a sub-atmospheric pressure of approximately 3" of water in the duct of the nozzle by the above described manipulation oi' the screw 54 of the adjustable caster means I9 for properly locating the nozzle entrance mouth 41 above the -suri'ace of the rug 20, causes the portion of the rug immediately beneath the nozzle entrance mouth 41 to be partially sucked up into the nozzle entrance mouth 41 as shown in Fig. 7, whereupon the sub-atmospheric pressure in the duct of the nozzle may immediately drop to approximately 6" of water when the cleaner is new and has a new bag I1, and which drop may be to approximately 5" of water after the lnterstices of the new bag |1 receive the permanent. quantity of very fine dust, after being put into use.

Accordingly for such a cleaner, the signal operating means 35-R. may be arranged so that the piston disk 4| raises so its shutter. disk 45 shuts ofi the light passing through the red lens 33-R when the sub-atmospheric pressure drops to approximately 3" of water in the duct of the nozzle, with the opposite action causing a dropping of the piston disk 4| and a dropping away of the shutter disk 45 from light obstructing position with respect to the red lens 33-R, when the subatmospheric pressure becomes greater than approximately 3" of water.

As above stated, the signal operating means i 35-G is provided with a heavier piston disk 4|,

rod 43, shutter 45, and screw 46 than those of the means 35-R, so that for example it may require a sub-atmospheric pressure of as low as approximately 4" of water to permit elevation of the piston disk 4| of the signal operating means 35-G to shut oli the passage of light through the green lens 33-G.

Accordingly there will be no llight passing through the green lens 33G during an optimum suction or sub-atmospheric pressure range of approximately .6" to 4" of water, in the duct of the n0zzle,but when by reason of an accumulation of dust and dirt in the dust bag |1', the sub- .y atmospheric pressure in the duct of the nozzle increases to greater than approximately 4" ofwater, the signal operating means 35-G will operate to drop its shutter 45 from light obstructing position below the lens 33-G, which will then light up indicating that the dust bag should be' cleaned,

if the nozzle adjustment is correct.

In other words, when the cleaner has proper nozzle adjustment and is operatingvon a rug, the signals indicated bythe two signal means are the same, no light emitting from either signal lens 33-R or 33-G, since the suction existing in the nozzle is greater than each of the two diilerent Y prescribed or particular degrees of suction, the existence or non-existence of which is indicatedt by .the two signal means.

or adjusted to a proper position with respect to.

For example a degree of suction oi 5" of water coincident with a normally clean dust bag and' when the cleaner with proper nozzle adjustment is operating on a rug, is greater than a degree of suction of 4" of water which is the aforesaid second particular degree of suction, the existence or nonexistence of which is indicated by the signal means with which the lens 33-G is associated, and a degree of suction of 5" of water is also greater than 3" of Water, therst prescribed or particular degree of or minimum suction coincident with proper nozzle adjustment for optimum cleaning.

On the other hand, if light is emitted from the lens 33-G and no light is emitted from the lens 33-R, then the operator is signaled'that the dust bag should lbe cleaned, but that the nozzle is in proper adjustment. v

When light is emitted from both lenses 33-G and 33-R, the operator is signaled that there is not proper nozzle adjustment, and that there may be a clogged dust bag. To determine the dust bag condition however, it is (necessary to adjust the nozzle so that no light is emitted from the lens 33-R, after which, if light still is emitted from the lens '3S-G, then the dust bag should be cleaned. A

In other words, any particular condition oi suction in the nozzle of the cleaner I is always indicated by the combined indications of both signal means, even though these indications may be sometimes the same in each signal means, that is each lens emitting light, or each not emitting light.

In some cases, either of the signal operating piston rods 43 may be arranged to switch on and ofi other types of signal means, as by having a piston rod operate a switch in an electric circuit, controlling a light, a bell, or similar signal means.

Also either signal operating rod may be arranged to actuate movable signal members, or the upper end of either .rod 43 may in itself be usedas a signaling indicator.

It is to be understood that while suction or subatmospheric pressures,in the amount of 1", 3, 4 and 6" of water have been referred to in describing the present invention; the invention is not limited to such particular suctions or subatmospheric pressures, because the same are dependent upon the particular design of suction cleaner. y

The present improvements as above described by way of example thus provide a suction cleaner in which different variations in the suction or pressure of the air existing in the cleaner passages are utilized to actuate diiferent means, such as signal means, for example for automatically indicating to the user two separate degrees of suction or sub-atmospheric pressure of thelcleaning air, one of which may be utilized to indicate the proper adjustment of the nozzle mouth of the cleaner, and the other of which may be utilized to indicate that the dust bag of the cleaner should be emptied.

The scope of the invention is not limited to an adjustment of the nozzle by manipulating an adjustable caster, because the nozzle adjustment may be eilected by other suitable means or by hand.

Accordingly the present improvements provide in a simple, compact, and automatically operating manner, a signal which indicates when the nozzle mouth of a cleaning apparatus has been located the surface to becleaned, and also in which preferably in combination with the nozzle adjustment signal, there is another signal which indicates for example when the dust bag of the cleaner should be emptied. n

`Having now described the features of the invention, the construction, adjustment, and use of preferred forms of the invention, and the advantages of the results obtained thereby; the new and useful parts, elements, devices, combinations and constructions, and reasonable mechanical equivalents thereof obvious to those skilled in the art, are set forth inthe appended claims.

I claim:

1. In suction cleaning apparatus, a fan housing, a fan in said housing, a nozzle mounted on the fan housing having lips forming an entrance mouth in which the suction becomes increased to -a rst predetermined proper cleaning suction when the nozzle lips are located at a correct position with respect to the surface being cleaned, a dust bag connected with the fan housing so as to iilter the dust and dirt laden air discharged by the cleaner, first signal means, rst suction operated means operatively associated with the first signal means, second Signal means, second suction operated means operatively associated with the second signal means, means communieating with the first suction operated means and with the suction side of the fan above said nozzle lips, means communicating with the second suction operated means and with the suction side of the fan above said nozzle lips, said first suction operated means and communicating means being so constructed and arranged that the iirst signal means is operated by the first suction operated means the instant that the first predetermined proper cleaning suction exists in the nozzle, said second suction operated means and communieating means being so constructed and arranged that the second signal means is operated by the second suction operated means the instant that a second particular degree of suction exists in said. entrance mouth greater than said first predetermined proper cleaning suction, said second particular degree of suction being that established as coincident with an undesirable accumulation of dust and dirt in the dust bag, whereby the signals indicate in combination the several conditions of cleaner operation.

2. In suction cleaning apparatus, a nozzle Ahaving a passage for the suction air, the suction in the passage varying during use of the apparatus,

iirst signal means for indicating the existence or non-existence of one particular suction range in the passage coincident with a predetermined nozzle adjustment with respect to 'a surface being cleaned, and second signal means for indicating the existence or non-existence of another particular suction range in the passage greater than the ilrst and coincident with a predetermined dust bag condition, suction actuated means associated with the passage and with the first signal means for operating the first signal means, and suction actuated means associated with the passage and with the second signal means for operating the second signal means, the signal operating means being actuated by different suctionsin the passage whereby the signal means con-v jointly indicate the several conditions of cleaner operation.

EUGENE F. MARTINET.

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