US3501798A - Electric polisher for smooth vertical walls,such as window glass - Google Patents

Description

March 24, 1970 E. CARRARO 7 3,501,798

ELECTRIC POLISHE OR SMOOTH VERTICAL WALLS, SUCH wmnow GLASS Filed pril 9. 1968 s Sheets-Sheet 1 6 g P 3%?91 r a March 24, 1970 E. CARRARO 3,501,798

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5 Sheets-Sheet 2 ELECTRIC POLISHER FOR SMOOTH VERTICAL WALLS,

AS WINDOW GLASS Filed April 9, 1968 March 24, 1970 E. CARR/ARC 3,501,798

ELECTRIC POLISHER FOR SMOOTH VERTICAL WALLS, SUCH AS WINDOW GLASS Filed April 9, 1968 3 Sheets-Sheet 3 3 no 2 z 4 25 103 United States Patent 3,501,798 ELECTRIC POLISHER FOR SMOOTH VERTICAL WALLS, SUCH AS WINDOW GLASS Ennio Carraro, Via Roma 305,

. 30038 Spinea, Venice, Italy Filed Apr. 9, 1968, Ser. No. 719,946 Claims priority, applicatilo/n6 Italy, Apr. 15, 1967,

Int. Cl. A471 7/02, 1 /02; A46b 13/04 US. Cl. 15-320 9 Claims ABSTRACT OF THE DISCLOSURE This invention relates to an electric window glass polisher i.e. an appliance which is particularly useful for cleaning and polishing smooth plane surfaces, and particularly vertical surfaces, such as window glass.

The object of the invention is to provide a light-weight electric polisher of smooth vertical surfaces provided with a hood and a peripheral yieldable skirt tightly adhering against the surfaces to be polished. Said polisher, which will be briefly called window glass polisher is a light-weight polisher adapted to be readily shifted along plane vertical glass surfaces to be cleaned and polished by the combined action of rotating brushes and of a cleansing liquid, means being provided for spraying the liquid against the walls to be polished, preventing its downfiowing, removing the sprayed liquid from the cleaned wall, whirling same in the air enclosed under said hod and sucking such polluted air, if necessary after having comminuted the liquid droplets and subjected same to the action of a heater for transforming the liquid into vapor, before discharging same outside of the apparatus by blowing same off through an outlet opening of said hood.

The invention will be better understood from the following specification of a preferred embodiment of the apparatus, which will be described with reference to the accompanying drawings, in which:

FIGURE 1 is a diagrammatical top plan view with parts in section of a window glass polisher according to the invention;

FIGURE 2 is a top plan view of the same polisher, without cover or hood;

FIGURE 3 is a vertical section on line IIIIII of FIGURE 1;

FIGURE 4 is a vertical section on line IV-IV of FIGURE 1;

FIGURE 5 is a horizontal section on line VV of FIGURE 4;

FIGURE 6 is an enlarged section through the lower brushing and packing skirt;

FIGURE 7 is a vertical section through one of the rotating brushes and FIGURE 8 is a perspective view of one of the brushes, dismounted from the apparatus.

The window glass polisher as shown in the drawings comprises a casing 1 composed of a base plate 2 and hood or cover 3 fastened thereto. To said casing a tubular handle stick 4 is swingably fastened by means of its uCe forked ends 5 to two side pivots 6 mounted onto the hood 3 (see FIG. 1). Stick 4 is preferably composed of a plurality of tubular sections fastened together.

The casing 1 is provided at its outer edge with a projecting elastically yielding striping and packing skirt 7 which extends along the whole periphery of the casing and is composed of an outer felt brim or lap 107 and of an inner layer of brush filaments 207 (see FIG. 6). Said packing skirt 7 is clamped between two superposed border sections 103 and 103 of the hood 3.

In the base plate 2 five shafts 8, 9, 10, 11 and 12 are rotatably mounted so as to project downwardly and carry at their projecting ends each a substantially cylindrical brush 13. Said shafts are rotated by an electric motor 14 which through a speed-down gear 15, 16 drives the central brush shaft 8 onto which two superposed pulleys 108 and 208 are keyed which through a pair of driving belts 17 and 18 drive each a pair of pulleys 109-110 and 111- .112 fastened onto the brush-carrying shafts 9-10 and 11-12.

Upon the central shaft 8 there is mounted the blade rotor 19 of a suction fan 20, the outlet of which is connected to an opening 21 in the hood and it thus open to the outer air. The suction side of said suction fan 20 is connected through a pair of suction ducts 22 with a pair of suction openings 23 provided in the base plate 2. In each duct 2 a drop breaking strainer 24 and an adjoining electric resistance 25 are mounted.

Within the casing 1 a tank 45 for a cleansing liquid is mounted, which through a suction duct 26 is connected with a compressed-air spray nozzle 27 mounted onto the lower side of plate 2. Said cleansing liquid may be filled into the tank through a cap-closed neck 28. Upon brush shaft 10 and above the pulley an air blower 29 is mounted, the casing 129 of which is fastened to the base plate 2 by means of a stirrup 30, while the rotor 229 is fastened to an upper extension of shaft 10. The pressure side of pump 29 is connected to nozzle 27 through duct 31 and is connected by means of a branch hose 32 with a pressure air outlet 33 provided in the stick 4, as clearly shown in FIGURES 1 and 2.

Brushes 13 are dismountably fastened to the ends of brush shafts 8-12. For this purpose said brushes are mounted in a holder 34 provided with a hub 35 provided with a recess having a non-circular cross section (in prac tice, the recess has two opposite flat walls) which is fitted onto a correspondingly shaped end 37 of the brush shaft 8 (see FIGURES 7 and 8). The brush holder 34 is also provided with a pair of diametrically opposite snap teeth 36 which, when the brush holder 34 is fitted onto its shaft, snap into a peripheral groove 38 of the shaft and thus prevent any axial slipping of the brushes. The teeth, however, have rounded ridges, so that they can come out of groove 38, when an adequate pull is exerted on the brush holder 34. The end of shaft 8 is frusto-oonical for rendering the fitting of the burst holder easy and for centering purposes. I

The electric wires 39 which feed the motor 14 and the electric heating resistances 25 pass through one of the fork arms of the stick and lead to a switch 40 on the stick 4.

In operation, the glass polisher, which is constructed very light, is pressed against the glass to be cleaned and polished, as shown in FIGURE 4, so that the peripheral skirt 7 and the brushes 13 tightly adhere on the glass and with the motor 14 on, the appliance is guided along the window glasses to be cleaned and at the same time the cleansing liquid from tank 45 is sprayed against the glass surface from time to time, under the control of the operator. Thus, due to the provision of the peripheral felt skirt 7 reinforced by a row of brush filaments, a closed chamher is formed under the hood. It is to be noted that an air outlet 33, FIG. 1, is provided on the stick. When this outlet is open, the air under pressure generated by the constantly operated air blower 29 is blown off through branch duct 32 and outlet 33 in the open air and no liquid is pumped from tank 45. Whenever is desired to spray some liquid against the glass walls, the operator closes the air outlet 33 with a finger and thus the whole compressed air generated by the blower is pumped through duct 31 and spray nozzle 27 and the cleansing liquid is sucked from the tank and sprayed against the window glass 41 or like smooth wall.

It is to be noted that, due to the provision of the peripheral felt skirt 7, when this adheres against a flat smooth surface, also due to the pressure of the outside air while the interior is under suction of suction pump 20, a closed chamber is formed under the hood 3, so that the spray liquid is prevented from flowing out along the glass walls. At the same time the cleansing liquid whirled into the air under the hood by the rotating brushes is sucked by the suction fan 20 through openings 22 and is discharged into the open air through outlet 21, FIG. 1. On its way to this outlet, the droplets in the air pass in proximity of the electric heatin g resistances 25 fitted within ducts 22 and thus the whole liquid is vaporized, whereby the larger droplets are comminuted by passing through wire netting 24 before being vaporized by the heat. In this manner liquid is prevented from accumulating under the hood 3.

I claim:

1. Electric cleaner and polisher having an operating stick, particularly for polishing smooth walls, such as window glass and the like, comprising a plate, a hood having an opening at its top, fastened above said plate and provided with a circumferential skirt of felt and brush filaments extending downwardly beyond said plate and adapted to adhere with a tight fit against the smooth walls; an electric motor provided with a motor shaft under said hood; a central vertical shaft; a step-down gear connecting said motor shaft to said central vertical shaft; a plurality of peripheral vertical shafts around said central vertical shaft; a rotary brush mounted to each vertical shaft, beneath said plate; means on said central shaft for driving each of said peripheral shafts; a suction fan under said top opening of the hood and discharging therethrough polluted air from below the hood; means for driving said suction fan from said motor shaft; a blower; means for driving said blower from one of the peripheral vertical shafts; a liquid tank; at least one spray nozzle under said plate; means connected to the blower for conveying the liquid from said tank to said spray nozzle and for spraying same against the surface to be polished, and ducts connected to the suction side of said fan and means in said ducts for comminuting and vaporizing liquid particles whirled around in the air under the hood by the combined action of said rotating brushes and of said suction fan, which thereafter sucks and ejects the air containing the vaporized cleansing liquid through said outlet opening at the hood top.

2. An electric polisher for smooth vertical walls according to claim 1, by which the said step-down gear is a worm and worm wheel gear.

3. An electric polisher for smooth vertical walls according to claim 1 by which said central vertical shaft is provided with superposed belt pulleys and said peripheral vertical shafts are provided with belt pulleys at the height of either belt pulley of said central shaft, and a transmission belt drivingly connecting one of the pulleys on the central vertical shaft with one pulley on at least one of the peripheral shafts.

4. An electric polisher for smooth vertical walls according to claim 1 by which said central vertical shaft is provided with superposed belt pulleys and said peripheral vertical shafts are provided with belt pulleys at the height of either belt pulley of said central shaft, and a transmission belt drivingly connecting one of the pulleys on the central vertical shaft with two parallel pulleys on two peripheral vertical shafts.

5. An electric polisher for smooth vertical walls according to claim 1, by which the said suction fan is mounted directly upon one of the vertical shafts.

6. An electric polisher for smooth vertical walls according to claim 1, by which the said suction fan is mounted directly upon one of the vertical shafts and the said blower is mounted directly upon another vertical shaft.

7. An electric polisher for smooth vertical walls according to claim 1, by which the said suction fan is mounted directly upon one of the vertical shafts and the said blower is mounted directly upon another vertical shaft; a duct connected to the pressure side of said blower; a branch of said duct opening to the exterior in the operating stick, so that said opening may be closed by means of a finger the other branch being connected to said spray nozzle and a duct for feeding a cleansing liquid to said spray nozzle.

8. An electric polisher according to claim 1 in which the means in said ducts for comminuting and vaporizing the droplets suspended in the air comprise a wire net strainer and an electric heating resistance in proximity to said strainer.

9. An electric polisher according to claim 1, in which the lower ends of said vertical shafts project below said plate and are provided with a groove and non-circular ends, while the brushes are provided with hubs having correspondingly non-circular recesses and snapping means permitting detachable fastening said brushes under said shafts.

References Cited FOREIGN PATENTS 5/1933 Great Britain. 1/1913 France.

ROBERT W. MICHELL, Primary Examiner

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