US2159701A

US2159701A - Suction cleaner

Info

Publication number: US2159701A
Application number: US126392A
Authority: US
Inventors: William H Kitto
Original assignee: Hoover Co
Current assignee: Hoover Co
Priority date: 1937-02-18
Filing date: 1937-02-18
Publication date: 1939-05-23
Anticipated expiration: 1956-05-23
Also published as: GB476220A; USRE22077E

Description

May 23, 1939. w. H. KITTO suoTloN CLEANER `Filed Feb. 18, 1937 2 Sheets-Sheet l ATTORN EY May 23, 1939. w, H KITTO 2,159,701

SUCTION CLEANER ATTORNEY Patented May 23, 1939 SUCTION CLEANER William H. Kitto, Canton, Ohio, assigner to'l'he Hoover Company, North poration of Ohio Application February 18, 1937, Serial No. 126,392

7 Claims.

'I'his invention relates to improvements in suction cleaners and more particularly to a type of cleaner in which a novel arrangement is provided for the motor and thence discharging it into the atmosphere through a passage formed as a part of a dome-like cover` or hood enclosing the motor.

The object of the invention is to provide a novel and improved solution of the problem of cooling lthe motor of a suction cleaner characterized by a somewhat larger hood over the motor than is usually provided and one that is extended lengthwise of the cleaner body a distance forwardly and rearwardly of the motor, thus giving the cleaner a so-called stream-lined appearance.

It may be added in this connection that the scheme of Ventilating a. motor is notoriously old and motors designed for suction cleaners have long been made with a. small fan mounted on the armature shaft for promoting the iiow of air through the motor and as a means of dlssipating the heat generated by the motor. However, in a cleaner of the design heretofore alluded to, the problem of conducting air to and from the motor 5 is somewhat complicated by the hood design and hence the following description has to do with the solution of this problem in a simple and practical manner.

In the accompanying drawings two arrangements for conducting the air from the motor to the atmosphere have been illustrated and will be described in the following discussion.

Thus, the figures of the drawings may be briefly described as follows:

Figure 1 is a general view in side elevation of a suction cleaner embodying the novel features of the` invention, with portions broken away to show the internal construction.

Figure 2 is a view in vertical section through the motor and hood as taken on line 2-2 of Figure 1.

Figure 3 is a' plan view of the inside ofthe motor hood removed from the cleaner body.

Figure 4 is a view of the motor casing and hood in vertical section and showing a modified arrangement for discharging the air from the motor.

Figure 5 is a fragmentary top plan view of the forward end of the motor hood witha portion of its top wall broken away to show the arrangement of the parts therebelow.

Figure 6 is a detailed view in vertical section through the forward ,end of the hood as taken on line 6-6 of Figure 5.

Referring to the suction cleaner in its general conducting a current of cooling air through` Canton, Ohio, a cor- (Cl. 23o-,117)

aspects, the same consists of a somewhat shallow body portion or main casing I having a fiat top surface and a rounded forvbi'arcbportica-identifying the nozzle portion 2 extending across the forward end thereof. The nozzle portion is provided with a downwardly facing suction mouth leading rearwardly through a passage into a fan chamber in which a suction-creating fan 3 is located. The fan chamber opens rearwardly into an exhaust passage which in turn discharges into a dirt bag l having detachable connection with a flange 5 at the extreme rear end of the exhaust passage. 'I'he cleaner is supported on wheels 6 and is maneuvered over the surface by means of a handle 1 having a U-shaped bail 'la straddling the' dome-shaped hood 8 over the motor 9.

'I'he motor hood consists of an elongated domeshaped cover primarily intended to serve as an enclosure for the motor 9 which is supported firmly on the main casing with its armature shaft vertical and in direct driving connection with the fan 3.

The motor 9 may be of any standard type suitable for the purpose, although as herein disclosed, it includes-an outer shell or frame 9a of cylindric shape forming a substantially complete enclosure for the armature and stator. This cylindric shell or frame is preferably molded of a suitable plastic substance such as Bakelite and otherwise is designed and constructed as to preclude the necessity of an additional enclosure for the motor, except for the external appearance of the cleaner. The dome-like hood 8 is likewise molded of Bakelite and designed to give the stream-lined appearance heretofore mentioned, namely, the rounded and almost spherical front end portion gradually converging rearwardly to a comparatively square rear end but maintaining the rounded contour transversely throughout its length as clearly shown in Figures 2 and 3.

Referring further to the motor 9, and particularly its mounting upon the top wall of the main casing I, the shell or frame 9a is provided about its bottom edge with suitable supporting feet 9b resting upon the top wall of the casing and spaced apart so as to form slots I0 therebetween as clearly shown in Figure 2. These slots open into the lower end of the motor frame allowing air from the surrounding space to pass upwardly through and around the armature and finally to a cap-like member il over the upper end of the motor frame 9a and providing a chamber for a small motor Ventilating fan l2 mounted at the upper end of the armature shaft. And

Rassufu APR 2 1 1942 finally, the motor Ventilating fan chamber ll has a laterally facing slot or opening l la arranged in a. plane slightly oblique to the vertical and adapted to communicate with a passage extending rearwardly along the top wall of the motor hood 8 andthen to the atmosphere through a horizontal slot formed in the rear wall of the hood immediately above the dirt bag supporting connection at the rear end of the main passage l.

But before describing the exhaust passage in the motor hood 8, attention will first be directed to Figure 3 showing somewhat the complicated and intricate arrangement of integral webs depending from the inner surface of the top wall of the motor hood il. Thus, at the center is a substantially circular web i3 with inwardly projecting radial segments lfia. This annular web i3 seats on the motor with its edges bearing against the top surface of the motor frame Qa. Now, the rearrnost portion of the annular web i3 has the form of a straight chord-like segment l3c and extending rearwardly therefrom with a distinct outward taper or flare is a pair of depending webs or flanges it, ld terminating at the opposite rear corners of the hood but arranged slightly unsyrnmetrically with respect to its longitudinal center line as is clearly seen in Figure 3. These depending webs ld, lli form the side walls of the exhaust passage for the Ventilating air discharged from the fan chamber il at the upper end of the motor frame. incidentally, this pas- Sage is offset from the center line of the hood because the discharge outlet lila, from the ventilating fan chamber l is lilrewise offset to conform with the tangential direction of the air as it leaves the fan blades.

Now, to complete the Ventilating exhaust passage, a light metal plate l5 is fitted over the bottom edges of the depending webs ld, i151-, this plate being shaped to conform to the outline of the space included between said web-s 6G, if? and having at its forward and rear corners enlarged ear-like portions liia registering with pairs of bosses lila and forming an anchorage for a set of retaining screws l@ for the bottom plate iii.

As clearly shown in Figure ll, the bottorn plate l5 forming the exhaust passage assumes an inclined position generally parallel with the downwardly sloping top wall of the motor hood il, but at its front and rear edges it is bent to abut the rnotor and the rear wall of the hood at right angles respectively, the front edge of the plate coinciding with the lower edge of the outlet lia and its rear edge with the bottom of a narrow transverse slot il, extending substantially the full width of the vertical rear wall of the hood and forming the outlet for the air passage. immediately above the entrance to the outlet slot li is a pair of integral reinforcing webs i8, il for structural purposes only and iininediately below the slot ill is a spring latching member i9 which serves to hold the hood place upon the main casing, as will later be described in detail.

And finally to complete the circulatory systein for the rnotor Ventilating air, there is provided along the lower edges of the motor hood il, pair of elongated inlet slots 2@ located on opposite sides of the motor hood and hearI the rear end thereof Thus, referring to Figures l and 2, it will be observed by following the arrows indicating the direction of the Ventilating air, that the air is first drawn into the hood S, through the slots 2@ along the lower edges thereof, thence into the slots i@ around the base of the motor Casing, upwardly through the motor and into the Ventilating fan chamber Il and nally rearwardly and downwardly through the exhaust passage and finally discharged into the atmosphere through the rearwardly opening slot Il.

Referring now to Figures 4, 5 and 6, an alternate method of discharging the motor Ventilating air is disclosed wherein advantage is taken -of an opening already available at the forward end of the motor hood for the discharge outlet. This opening is the window through which light is thrown from a lamp to illuminate the fioor or carpet surface immediately in front of the cleaner. In short, the air outlet from the upper end of the motor casing is directed forwardly instead of rearwardly and into the same chamber which houses the lamp and from whence it passes outwardly through the window.

For this alternative arrangement, the motor 8 would be identical in every respect, except that Ventilating air chamber l l at the top of the motor frame faces forwardly instead of rearwardly. In other words, it can be assumed that either the same motor has been turned through an angle of 18() degrees, or that the upper end portion of the motor frame Sie can be turned or rotated through degrees from the rear to the front.

As for the motor hood, its general shape and construction would be the same as before except that there would be made no provision for the :1

mounting of a separate plate for the formation of a discharge passage, nor would there be an Outlet slot formed in the rear wall of the hood. There would however, be internal reinforcing webs extending rearwardly from the center of the hood,

ing contact with the forward portion of the motor casing @a just above the discharge outlet from the inotor Ventilating fan chamber Il. Now, extending forwardly and transversely from the web 2i is a pair of wall segments 22, which are spaced apart on opposite sides of the longitudinal center line of the hood to form the lside walls of the lamp chamber in the forward end of the hood. As clearly shown in Figure 5, these wall segments 22, Eil merge with the transverse web El at points oiset at different distances from the center line of the hood and for this reason are inclined outwardly at different angles throughout 'their inner end portions but finally become parallel with each other as they approach the rounded front wall of the hood with which they are integrally molded.

A transversely elongated window opening is located at a point substantially one-half of the height of the hood and extends practically the full width of the lamp chamber. A metal reflector is mounted at the front of the motor being suitably attached thereto and consistingol a substantially semi-circular portionlld facing forwardly somewhat above the level of the window vside edges.

one'. edge of' I the" reflector "24,` dhving Suitable the light outwardly through the window opening 23A and in` Ya downwardly direction to cover a small area immediately in front vof the cleaner.

Thus, without elaborating' further as to the construction ofthe lamp chamber and the arrangement of the lamp therein, it is sufficient to observe that themotor Ventilating air having passed upwardly through the motor in the manner already described, is discharged forwardly into the upper end portion of the lamp chamber, whereupon it follows a downward path, thence finding its way out of the hood through the' window 23.

inasmuch as cleaners of the type herein disclosed are invariably equipped with'illuminating head lights at the forward end of the motor hood, the utilization of the lamp chamber and the window, affords a natural outlet for the motor ven-l tilating air and thus obviates the necessity for providing a passage in the hood as in the first arrangement described. At the same time, each arrangement has its advantages. Thus, the formation of a separate discharge passage leading outwardly through the rear end of the hood may increase slightly the cost of production, it has the advantage of providing an unobstructed passage for the air and one in which dirt will not accumulate readily. On the other hand, the utilization of the lamp chamber may afford a somewhat less expensive construction, but it also has a disadvantage, namely, that dirt particles would tend to be deposited on the lamp and refleeting surfaces and otherwise to accumulate within the lamp chamber.

In any case, it is quite evident that regardless of the particular point from which the motor Ventilating air is discharged from the hood, the exhaust passage is formed as a part of the hood and so arranged that in its assembly upon the motor casing, the connection between the exhaust passage and the outlet from the motor Casing is established.

To complete the mounting of the hood B upon the casing I, mention was made ofthe spring latch member I9 mounted at the rear of the casing. This latch member is preferably a short strip of spring steel fastened at its lower end to the front face of the upstanding flange at the exhaust outlet connection, midway between its The upper end of the latch member is bent to form a loop I9a located just below the I top edge of the flange 5 and registering therewith is a detent 21 formed in the outer face of the rear wall of the -hood 8 and more particularly, within a shallow U-shaped recess 28 extend vertically and centrally of said rear wall, as shown in Figure 3. This detent presents an upwardly facing shoulder adapted to have yielding contact with the underside of the looped end I9a of the latch member I 9, so that by first seating the rear end of the hood against the rear flange 5 with the detent 21 beneath the latch member, the front end is then lowered onto the top of the casing and secured by means of a screw 29 which is inserted through a hole in the front lower edge of the hood andy registering with a threaded hole in an upstanding bracket 30 mounted on the top face of the casing I just inwardly from the edge of the hood, as shown in Figure 4. The inner face of the hood immediately adjacent the screw fastening is preferably lined with a thin plate 3|.

And to complete the mounting of the hood, a metallic band 32 fits around the bottom edge o i the hood, being riveted at its rear ends at 32a just forwardly of the exhaust outlet as shown in Figure 4. This band is not removable but is free to slide upwardly at the front of the hood, so that the screw 29 is accessible 'for removing the hood'. And finally, the bend`32 is'slotted to register with the inlet openings 20.'

This method of mounting the hood'is comparatively simple and yet is firm, vibrationless, and readily removable.

Having set forth a complete disclosure of my invention, I now claim:

l. Ina suction cleaner, the combination with a main casing including suction-creating means, of a motor supported upon said casing and operatively connected with said suction-creating` means, said motor being provided with ventilating means including air inlet and outletl openingsv at opposite ends thereof, and a hood enclosing said motor provided with a passageway formed by integral wall segments and having an opening at one end adapted to register with the outlet opening of said motor and communicating at its other end with an opening through said hood. Y

2. In a suction cleaner, the combination with a main casing including suction-creating means, of a motor supported upon said casing and having operative connection with said suction-creating means, said motor having a frame provided with air inlet and outlet openings adjacent opposite ends thereof and means for creating a flow of air through said motor for Ventilating purposes, a hood enclosing said motor and having a discharge passageway for the motor Ventilating air and comprising Wall segments integral with the inner wall surface of the hood and adapted to connect the outlet opening from said motor with a discharge opening in said hood.

3. In a suction cleaner, 'the combination of a casing including suction-creating means, an electric motor mounted upon said casing and having driving connection with said suction-creating means, said motor having a substantially imperforate frame provided with an air inlet and outlet openings at its opposite ends and means for creating a current of air therethrough, and a hood enclosing said motor and a substantial space surrounding the same and having a .motor 4. In a suction cleaner, the combination with i a casing including suction-creating means, an electricv motor supported upon said casing and having driving connection with said suction-creating means, said motor having a substantially, enclosed frame with an air inlet and outlet opening at its base and top respectively, and a-hood enclosing said motor and a substantial space about the same, said hood having openings communicating with the space enclosed thereby `and an air passage extending along the inner surface thereof and formed by integral spaced parallel wall segments and a transverse wall segment, said passage connecting the outlet opening from' said motor frame with anoutlet opening in the wall of said hood.

5. In a suction cleaner, the combination of a main casing including suction-creating means, a motor supported upon said casing and having a direct driving connection with saldsuctlon-creating means, a hood supported upon said casing and enclosing said motor, said motor being adapted to have a current of air impelled axially thereof and to be discharged through an opening at its top, said hood being provided with an air outlet opening in its side wall and a passage" connecting said air outlet opening with the discharge opening from said motor, and consisting of a pair of spaced webs integral with the. inner surface of said hood and a bottom wall segment extending transversely between said webs.

6. In a suction cleaner, the combination of a main casing including suction-creating means and provided with a flat top surface, a motor supported upon said casing and having driving connection with said suction-creating means, said motor having a substantially closed frame adapted to have a current of air impelled ver tically therethrough and to be discharged through a laterally facing opening directed toward one end of said hood, the latter being provided with air inlet openings adjacent its base, an air outlet opening in one end wall thereof and a motor Ventilating air discharge passage adapted to connect said air outlet opening and the discharge opening at the-upper end of said motor trame and comprising a, pair of spaced webs integral with the inner surface of said hood and a metal plate forming the bottom wall thereof.

7. In a suction cleaner, the combination of a` casing, motor-driven suction-creating means including a motor supported upon said casing and comprising a frame having an opening at its base and an opening adjacent its top for the circulation of Ventilating air therethrough, a hood enclosing said motor and forming a chamber at its forward end adapted to house a lamp, said chamber being connected with the outlet opening from said motor frame and having an opening at its bottom for the discharge of the air to the atmosphere.

WILLIAM H. KITTO.