US1740918A - Air-suction apparatus - Google Patents

Description

Dec. 24, 1929. A. A. CLARKE AIR SUCTION APPARATUS Filed Feb. 28, 1927 Patented nee. .24, 19 9 UNITED sTATEs PATENT.

OFFICE A. cum, or omosso, rLLm'ors AIR-SUCTION APPARATUS Application filed February 28, 1927. semi No. 171,400.

in the manufacture thereo while securing e cient-cleanin'g action; and other features which will appear from the following description of an exemplification of the invention, reference being had to the accompanying drawings, wherein p ig. 1 is a vertical-sectional view through a cleaner exemplifying the invention, along line I-I in Fig. 3; r

Fig. 2 is a side elevational view of the cleaner;

Fig. 3 is-a plan view of the cleaner; Fig. 4 is an elevational view of the rear. side of the cleaner; and

Fig. 5' is a transverse, vertical sectional view of the cleaner along line VV in Fig. 1. The ,tool of the present invention is a modification of the tool described and claimed in my co-lpending application Serial No. 169,379, filed .ebruary 18, 1927, and distinguishes therefrom in several respects, particularly referred to hereinafter.

- The tool comprises a circular fan l of' a familiar type mounted on a threaded forward end of a shaft 2 of an electric driving motor 3 mounted in the rear of the fan, coaxially therewith. The fan and the motor are housed enclosing t e motor, a chamber 6 surrounding the fan, a suction nozzle or intake duct 7 extending'from a central opening in the fan chamber dpposite the center of the fan, and an exhaust or discharge duct 8 extending from the upper side of the'fan chamber and leading above the motor chamber and directlya djoining the same. The front end of the nozzle has a relatively narrow, downwardl in a casin constituting a tubular" chamber 5.

directed, elongated intake-opening 9. T e" rear end of the discharge duct 8 forms a delivery port 10, over which may be secured a dust bag 11, only a portion of which is shown. I

The suction or intake duct 7 in front of the chamber is of such length and shape as to constitute a grip readily fitting the palm of the o erator. This grip is particularly suitable or cleaning operations in which the tool is held in'vertical position with the intake opening 9 of the nozzle directed toward a vertically-upstanding cleaning surface. When so operated, the motor hangs directly below the hand of the operator and'does not pro-- duce any excessive strains as was the case with prior art tools of this ty e.

A distinguishin feature 0 the invention is the utilization o the casing portion constitilting the discharge duct 8 on the top of the motor chamber as a second grip for operating the tool. As seen in the drawings, the main portion of the discharge duct constitutes a .flattened or oval tubular chamber of smaller diameter than the substantially circular motor chamber 5. The upper side 15'of the discharge duct is slightly rounded and is of such width as to fit the-palm of the operator. The side walls 16 of the duct are turned inwardly,

converging towards the wall of the motor chamber and forming grooves 17 at both sides of the duct along the lines where the two chambers'are joined by'the wall separating the same. Accordingly, the tool may be conveniently gripped at said portion of the duct,

the palm lying on the top of the duct and the fingers having a convenient hold of the tool within the two grooves on the sides of "the duct.

- With the tool held at said second grip it is particularly adapted for use in horizontal position, as shown in Fig. 1,the weight of mits economical manufacture thereof and eliminates laboriousand expensive machinother along two parallel planes 21, 22, transverse to the motor axis, one plane extending through the fan chamber 6 at the point where said chamber adjoins the motor chamber in front of the .motor, the other plane being at the rear end of the motor chamber. The motor casing is thus divided into three parts, the front part consisting of the portions constituting the fan chamber 6 and the intake nozzle 7; the central part comprising the side and front walls of the motor chamber 5 and the main portion of the discharge duct 8- which serves as a grip above the motor; and a rear part constituting the back cover 25 for the motor chamber and the rearend and delivery port of-the discharge duct.

' With the foregoing construction, the manufacture and assembly of the tool is very simple. The three parts of the tool casing may be made by casting, from aluminum for instance, or another light material. Thereupon the cooperating two pairs of surfaces may be readily machined, said surfaces being perfectly plane and parallel to each other. After the casing-portions have been so prepared, the motor 3 is inserted into the motor chamber through the open rear end thereof, the front end of the shaft being j'ournaled within the front wall of the motor chamber.

The field core member 29 of the motor is locked in place'by means oftwo locking screws 30 extending through the side walls of the chamber. The side walls of the motor chamber have also brush holder openings 31, in which are mounted brush holder cartridges 32 for guiding brushes 33 cooperating with the commutator 35 of the motor. The rear cover 25 is thereupon fitted over the rear opening of the motor chamber 5, journaling the rear end of the motor shaft and complementing the discharge duct 8, the cover being suitably fastened by means of a plurality of screws36.

- With the motor so assembled within the casing, theassembly of the tool. is completed by securing the front part of the casing over the fan, the front part being held inplace by means of a plurality of screws 40 extending through suitable lugs projecting from the easing walls. The fact that the plane along which the front portion of the casing is oined to the motor portion of the casing is perfectlyfiat, enables said portions to be machined by simple disk grinding operations, greatly facilitating the fit between the two portions, and securin an air-tight joint at the oints where the nee portion 41 of the disc arge duct joins the 'staright ductupor tion on the top of the motor.

I claim as my invention:

1. In a SHQtIOII QIBaIIBI, a rotary fan, an

electric fan-driving motor in the rear of said fan coaxially therewith, acasing comprising a chamber surrounding said fan, a chamber surrounding said motor, an intake duct extending from said fan chamber, and a discharge duct extending from said fan chamber and leading adjacent said motor cham ber alongside thereof, said discharge duct constituting an elongated protuberance extending alongside said motorchamber and fitting the palm of the operator for gripping the cleaner.

2. In a suction cleaner, a rotary fan, an electric fan-driving motor disposed in the rear of thefan coaxially therewith, a casing comprising a chamber surrounding said fan, a chamber-surrounding said motor, an

intake duct extending from a central open-' ing in the front wall of said fan chamber, and a discharge duct. adjoining said motor chamber alongside thereof, said discharge duct constituting an elongated protuberance extending alongside said motor chamber and fitting the palm of the operator for gripping the cleaner.

3..In a suction cleaner, a rotary fan, a motor coaxially disposed inthe rear of the 'fan for driving the same, a casing compris ing a chamber for said fan, a tubular chamher for said motor disposed in the rear of said fan chamber and separated therefrom by a partition wall, an intake duct extending from a central opening in the front wall of said fan chamber, a discharge duct constituting a protuberance extending alongside said motor chamber from the front end to the rear end thereof, said discharge ducthavingaknee portion communicating with the peripheryo port-at the end thereof, said protuberance having longitudinal grooves on the sides thereof for gripping the same to operate the tool.

4. In a suction cleaner, a rotary fan, an electric fan-driving motor disposed in the rear of the fan coaxially therewith, a casing comprising a chamber surrounding said fan, a chamber surrounding said motor, an intake duct extending from a central opening in the front wall of said fan chamber, and a discharge duct adjoining said motor chamber alongside thereof, said discharge duct constituting an elongated protuberance extending alongside said motor chamber and fitting the palm of the operator for gri ping the cleaner, said casing being divide into two cham er transversely to the motor axis.

arts along a plane through said fan said fan chamber, and adelivery I 5. In a suction cleaner a rotary fan, a

motor coaxially disposed in the rear of the fan for drivin the same, a casing comprising a cham er for sald fan,-a tubular I, chamber for said motor disposed in the rear of said fan chamber and se arated therefrom by a partition wall, aninta e duct extending from a central opening in the front Wall of said fan chamber, a discharge duct constituting a protuberance extending alongside said motor chamber from the front end to the rear end thereof, said discharge duct having a lmee portion communicating with the periphery of said fan chamber, and a delivery port at the end thereof, said protuberance having longitudinal grooves on the sides thereof for gripping the same to operate the tool, said casing being divided into three 'in .tegral sections, along a plane extending through said fan chamber in front of the partition wall separating the motor chamv.

berfrom said fan chamber, and along a plane extending in front of the rear wall of said motor chamber, said planes being perpendicular to the axis of said motor.

6. In a suction cleaner, a rotary fan, an

'electric fan-driving motor in the rear of said fan, a casing comprising a chamber surrounding said fan, a chamber surrounding said motor, and an air duct extending. from said fan, said air duct constituting an elongated protuberance extending alongside said motor chamber and fitting the palm of the operator for gripping the cleaner.

In testimony whereof I have hereunto subscribed my name this 19th day of February, A. D. 192

ALEX A. CLARKE.

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