US2297283A - Suction cleaner - Google Patents

Description

Sept. 29, 1942. Q. BERG SUCTION CLEANER Filed May 13, 1940 2 Sheets-Sheet l R & m e N EB R .v o W HM MY fi I U mkw Y I a 0 Sept. 29, 1942. Q. BERG SUCTION CLEANER Filed May 15, 1940 2 Sheets-Sheet 2 WWW E Wm 0 Patented Sept. 29, 1942 UNITED STATES PA E NT OF'FHEE SUCTION CLEANER Quentin Berg, North Canton.

The Hoover Company,

corporation of Ohio Ohio, assignor to North Canton, Ohio, a

I Application May 1 3.1940, Serial No. 334,725

3.Claims. (or. 239-117) vide a new" and improved suction cleaner. -It is another object of the invention to provide a new and novel motor casing structure in a suction cleaner. -Another object of the invention is to provide in a suction cleaner a motor casing formed by two halves, the one half cooperating with a cooling fan to provide an efficient means for forcing cooling air over the motor. Still another object of the invention is to provide a simple and inexpensive suction cleaner motor casing formed by two castings or moldings and so arranged that it is not necessary to employ sliding cores in casting or molding the halves forming the casing. It is still another object of the invention to provide a suction cleanerhaving a low vertical height so as to permit cleaning under low furniture. I

It is another object of the present invention to provide a new and improved motor cooling fan construction. Another object, isto provide a motor cooling fan having a single shroud on ed with an inlet opening and forming oneside oi. the chamber for the ventilating fan. These and other objects will-appearupon reading thespecifications and .claims hereinafter set forth.

1 In describing this invention, reference is made views.

' the inletside of the fantthe shroud being provid- Figure leis a view in side elevation of a modern suction cleaner with a portion of the cleaner,

broken away to show section.

Figure 2 is an'isometric view oi'the motor brush holder of the present invention. Figure .3 is a perspective view of the motor casing showing'the inlet and outlet for themothe driving motor casing in t'or cooling air.

Figure 4 1s an isometric view of the cooling fan with' half of the Ian broken away. 1

Figure 5 -isa viewin The usual suctioncleaner embodies a suction a,

a nozzle I, bottom and -a slight distance lips 6 and I. Positioned in the tan chamber 2 r creating means to produce a flow of air to carry away the dirt dislodged by a", rotating brush or .agitator. This arrangement is broadly old but the motor it is necessary to'provide a properly 4 designed Ian chamber to enclose a small centritugal fan. The provision of a fan chamber has necessitated a complicated motor casing structure so as to form the walls for the fan chamber. In addition the provision of a cooling or ventilating fan chamber has added height to the motor casing and in turn the total cleaner height because of the additional horizontal wall and the additional clearance required between that wall and the cooling air fan. The present invention achieves all the advantages of a properly designed cooling air ian chamber simply and inexpensively, and in additionthe total height of the cleaner is not increased over that whereia ventilating ianyis employed without a chamber.

The cleaner main casting is seen to comprise side walls oia i'an chamher 2 and an exhaust passageway 3 extending rearwardly from-the fan chamber 2. The fan chamber 2 communicates with the nozzle I through a suction passageway 4 whichis completed by a removable bottom plate 5. The forward nozzle hp 6' is formed integrally with the nozzle I and the rear nozzle lip I is formed by the removable bottom plate 5. Positioned-in the nozzle I is a rotaryagitator 8 having surface brushing and contacting elements which extend beyond the plane of the nozzle is a fan 9- which draws'the dirt laden air through the fan eye l0, and this air is exhausted through of nut I3. Thecleaner is supported on front and rear wheels II, M attached to the main cast v ing I, and there is alsopivotally-mounted. on the cross-section taken on the line 5-5 of Figure 4 showing a Bakelite mold used in' forming the ventilatingfan.

main casing I a propelling handle I5.

threaded extension of the motor shaft is formed linto adustbag u U usual'manner'to the' as a pulley l6 which drives the rotary agitator 8 by means of a rubber belt IT. The suction cleaner so. far described is of a well imown type and operates in a common and usual manner.

The'motor casing or housing comprises a lower section 2i and an upper section 22 which are held together by screws 23. 1 The motor casing 20 seats on the top of the main casing i and the lower section 2i forms the top wall of the fan chamber 2 as illustrated in Figure 1. The motor casing 29 is attached to the cleaner main casing by screws. (not shown) which extend through openings 24 in the lower section 2' into the main casting [(see Figure 3). Positioned within the motor casing 2d are the usual elements of a uni versal motor, namely fleld stack 25, with a winding 25 and an armature or rotor 2'! including a commutator 2B.

The armature is positioned for rotation by upper and lower bearing assemblies identified.v as and 3| respectively. The lower hearing assembly 3! is positioned in a downwardly opening recess 32 formed integrally in the lower section 2| of the motor case by screws 33 one of which appears in Figure l. The field stack 25 is also positioned in the lower section it ofth'e motor case by suitable fastening screws not shown. Formed integrally with the lower section 25 is a forwardly extending portion 3 3 and having directly molded or cast therein a vertically arranged lamp socket 35 to carry a small lamp 38. Ventilating air openings 31 are formed on each side of the lower section 2i the top of the open- I ings being flush withthe top line ofv the motor section 2i as is clearly shown in Figure 3. In addition a similar opening 38 is formed in the front vertical wall of lower section 2|. By bringing the top of openings?! and 38 flush with the top-of the lower section 2| it is not necessary to employ sliding cores to form these openings.

As seen from Figure 3 the upper section 22 comprises generally a unitary cup shaped portion 40 having a forwardly extending flange it which extends over and covers the field stack 25 and windings 26. The cup-shaped section 40 is generally circular in shape and is closed across the top by an integral wall member 42. Wall member 52 is provided with a centrally located opening and downwardly facing recess which serves to position the upper bearing assembly 88 which is held in place by rivets 63.

Two openings M are provided in the circular functions as a retainer for the commutating brush 5i and its attached pressure spring and also as a. current carrying member to the pressure spring since the commutator lead wire is secured to this screw.

As viewed in Figurel, it is seen that a ventilating fan It is mounted on the armature shaft immediately above the commutator 28 by means of a nut H. The ventilating fan will be described in detail hereinafter but for the present it is adequate to say that the fan is of the centrifugal type and operates in an integrally formed chamher which comprises the uppermost portion of the cup shaped portion 44 of the motor casing section 22. The ventilating fan chamber is closed across the bottom by shroud it on the fan '30 and which extends radially to the sides of the chamber 44 so as to provide only a running clearance thereportion to through which the brush holders 5!} openings 44 as large or larger than the outside 1 diameter of the cup shaped portion at the top of openings it. In practice the openings 46 are not cleanly formed as a thin flash of the molding material will close the openings but this flash can be easily punched out. Below each opening M arectangular shaped seat 45 is formed which serves as a seat for the brush holders 59.

Brush holder 50 is seen to comprise a, stamping generally shaped to provide a guide for the commutating brush 5! and having laterally extending flanges. 52, the one flange having 9, d wardly extending portion 53. The flanges 52 and the downwardly extending portion 53 serve to" position the brush holder on the seat 45 by means of the screws 54. The screw which extends through the downwardly extending flange 53 also serves to fasten a small metallic clip 55 which between.

The ventilating air exhaust opening St is formed in much the same manner as the brush holder openings B4. The diameter of the top wall segment 42 at the opening 60 is made slightly smaller than the inside diameter of the cup shaped portion 44 at the point where the opening is formed in order that the two halves of the mold or die which forms the casing section 22 will register thereat and thus form the opening 89 in the molded piece.

Completing the description of the upper section 22 it is to be noted that two upstanding spaced apart wall members 6! are formed integrally with the upper section 22 which cooperate with two depending'similarly spaced apart wall-members 52 formed integrally with the motor hood or cover it to form an exhaust-passageway for the ventilating air. The ventilating air flows through this exhaust passageway over the lamp 365, thus cooling the same, and is discharged to the atmosphere through the opening formed in the forward portion of the motor hood and through which the light rays are directed.

which is illustrated in Figure 4 it is noted that the fan is made in one piece and comprises a hub 72, blades '83 and a or shroud it. The hub i2 is in the form of a truncated cone from which the blades 13 extend radially.

Integrally formed with the blades 73 is the shrould it which extends radially a greater distance than the fan blades. The shrould is provided with a central opening i5 which forms the eye of the fan and through which the air enters to be acted upon by the fan. The construction of the fan iii is such that it may either be a die casting, as for example. die cast-aluminum, or a molding, as for exampl molded phenolic resin.

Likewise the construction of the fan is such that ,it can be made from a die or mold having only two parts and without pulling side cores.

In Figure 5 a simple compression type Bakelite mold is shown in section with the left hand half taken through the blade 13 and with the right hand half showing a section between blades as indicated by the section lines in Figur 4. The

lower half oi the mold is indicated by reference character Ti and the upper half by character 18. It is readily apparent that by makingthe diameter of the hub 12 at its largest point equal to or slightly less than the diameter of the eye 15, the fan is formed without pulling side cores. Thus a compact and rigid fan is obtained which is simple and inexpensive to construct.

- Referring to 'Figure l, the ventilating fan i0 is secured to the armature shaft by a nut II. It is also to be noted that the hub 12 of the ventilating fan is recessed on the topside in order that bearing assembly 30 may partially fit into the recess or hollowed out portion so that the overall height -of the cleaner motor is reduced.

To assemble the motor unit, the bearing assemblies 30 and 3| are first mounted in casing sections 22 and 2! respectively. Field stack 25 with its associated winding 28 is then secured in the lower casing section 2|. The armature assembly 21 minus the suction creating fan 9 and pulley I6 is theninserted in the lower hearing 3|. Ventilating fan 10 should be secured to the armature shaft at this point, or it may have been previously assembled on the shaft. Theupper half or section 22 is secured to the lower half. 2| by the screws 23. Motor brush holders 50 are then attached to the casing section 22 and the motor brush and other wiring connections are made. The final step comprises securing the fan 8 and pulley IE to the armature shaft after which the complete motor unit is secured to the cleaner main casing.

In operation, the motor ventilating air traverses the following path. The air enters the motor hood 18 at ports I! located near the rear and at each side thereof. The air next flows through port 38 and ports 31 of the motor casing section 2|, across the field windings 26 and armature 21 thus cooling the same. The air is admitted to ,ventilating fan chamber formed by the rotating fan shroud H and the upper section 22 of the motor case through the eye 15. Therein the air is placed under pressure and exhausted through exhaust port", passing through the channels formed by wall members 8i and 82, past the lamp l8 and exhausted to atmosphere through the opening in the front of the motor hood.

The advantages in applicants structure lies in the,improved construction of the parts of a suction cleaner so that these parts may besimply and inexpensively produced. Likewise the overall height of the cleaner is reduced which permits cleaning under low furniture. By applicant's invention the motor casing is formed by two simple moldings or castings, the one completing the top of the mainfan chamber and housing the motor field stack, the other part positioning the motor brushes and cooperating with a ventilating fan to form a centrifugal fan system for motor cooling purposes. This fan system is highly efiicient and furthermore makes use of a simple and inexpensive ventilating fan.

I claim:

1. In a suction cleaner, the combination of suction creating means including a motor, a housing for said motor provided with ports at its opposite ends for the circulation of ventilating air therethrough, said housing formed in two sections, one of said sections positioning the commutating brushes and a rotor bearing and including a raised circular portion forming the top and circular sides of a ventilating fan chamber, a ventilating fan provided with a single shroud of greater radius than the fan blades, said shroud having a central opening adapted to form a fan inlet, said shroud and said raised circular'portion of the housing cooperating to form a complete ventilating fan chamber. 2. In a suction cleaner, a motor housing formed in two sections, one of said sections comprising an open bottomed casing part having side and top walls, a ventilating air opening formed in said side wall, commutating brush holder openings formed in said side wall below said air opening, said side wall having each portion spaced radially a lesser distance than any portion therebelow in order that said part may be molded without the use of side acting cores, a motor shaft extended into said part, a motor ventilating fan carried by said shaft adjacent said top wall and said air opening, said ventilating fan including a single shroud having an inlet opening, said shroud being extended closely adjacent said side wall, the said top wall and said shroud forming the end walls of a fan chamber.

3. In a suction cleaner, a motor housing formed in two sections, one of said sections comprising an open bottomed casing part having side and top walls, a ventilating air opening and commutating brush holder openings formed in said side wall, supports for said commutating brush holders positioned exteriorly on said casing part, said side wall having each portion spaced radially a lesser distance than any portion therebelow in order that said casing part may be molded without the use of side acting cores, a motor shaft extended into said part, a motor ventilating fan carried by said shaft adjacent said top wall and said air opening, said ventilating fan including a single shroud having an inlet opening, said shroud being extended closely adjacent said side wall, the said top wall and said shroud forming the end walls of a fan chamber.

QUENTIN BERG.

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