US2464401A

US2464401A - Vacuum cleaner

Info

Publication number: US2464401A
Application number: US723170A
Authority: US
Inventors: George M Kelly
Original assignee: Douglas Manufacturing Co Inc
Current assignee: Douglas Manufacturing Co Inc
Priority date: 1947-01-20
Filing date: 1947-01-20
Publication date: 1949-03-15
Anticipated expiration: 1966-03-15

Description

Mafch 15, 1949. G, M, ELLY 2,464,401

VACUUM CLEANER Filed Jan. 20, 1947 a 3 Sheets-Sheet 1 I Ild Ila/2a [EVEN/Ur 7 650/262" M. KELLY ii 7 v 2% 795.

March 15, 1949. G. M. KELLY VACUUM CLEANER- 3 Sheets-Sheet 2 Filed Jan. 20, 1947 J'JVEH/bf' "GEORGE M. KELLY ZQM Z T March 15, 1949. e. M. KELLY 2,464,401

VACUUM CLEANER I Filed Jan. 20, 1947' J 3 Sheets-Sheet :5

| l YIIIIIIIIIIA @6006: M. KELLY Patented Mar, 15, 1949 VACUUM CLEANE George-M. Kelly, Sturgis, Mich., asslgnor to Douglas Manufacturing Company, Bronson, -Mich., a corporation of Michigan Application January 20, 1947, Serial No. 723,170

Claims. (Cl. 230-117) This invention relates to a vacuum cleaner and particularly'to an improved construction for a tank-type vacuum cleaner permitting the manufacture of a vacuum cleaner of improved performance and appearance at a substantial reduction in cost over constructions heretofore known in the art. 4

Since vacuum cleaners of the horizontal axis, tank-type have long been known in the patented art, this invention necessarily relates to improvements in the constructional features of such vacuum cleaners which improve the performance of the vacuum cleaner, improve its appearance, facilitate the handling of the vacuum cleaner in use, and permits a substantial saving in manufacturing cost to be realized.

Accordingly, it is an object of this invention to provide an improved vacuum cleaner of the so called tank-type.

A further object of this invention is to provide an improved mounting for the blower unit of a tank-type vacuum cleaner which will permit such blower unit to be completely cushioned on soft rubber and supported for both radial and axial vibration independently of the main casing of the vacuum cleaner. Such construction provides a substantial reduction in the noise created by the vacuum cleaner during operation and also prolongs the life of the moving parts of the blower unit.

A particular object of this invention is to provide an improved latch construction for effecting the securing of an end cap or casing to the main casing of a tank-type vacuum cleaner, characterized by the inclusion of a latch operating member of elongated, channel-shaped configuration which, in the secured position of such latch, completely conceals all of the other latch elements and provides the pleasing appearance of a trim stripon the exterior of the vacuum cleaner casing.

Another particular object of this invention is to provide improved securing arrangements for an end casing of a tank-typ vacuum cleaner constituting a plurality of bracket members secured to the exterior of the main casing of the vacuum cleaner and having means formed thereon for receiving a .nut and retaining such nut against both axial and rotative movement so that screws passing through the end casing member and cooperating with such nuts will effect the rigid securing of the end casing to the main casing.

Another object of this invention is to provide an improved tank-type vacuum cleaner construction characterized by the incorporation of a closure member for the air discharge outlet of the vacuum cleaner which is mounted on the casing for movement between opening and closing positions with respect to the air discharge aperture, in its opened position, permitting the attachment of a cleaning hose to the air discharge end of the vacuum cleaner, and in its closed po.- sition, presenting an exterior surface contoured to the general exterior lines of the vacuum cleaner, hence'improving the appearance thereof, and preventing the accidental insertion of foreign objects into the discharge end of the vacuum cleaner where such objects may contact the moving elements of the blower unit and causing damage thereto.

Still another object of this invention is to provide a frictional engagement between the mouth of the bag of a tank-type vacuum cleaner and the end casing commonly associated with the mouth of the dust bag so that the dust bag is removable from the interior of the main casing with the removal of the end casing, thereby preventing the inadvertent spilling of debris from the dust bag upon removal of the end casing.

The specific nature of the invention, as well as other objects and advantages thereof, will become apparent to those skilled in the art from the following detailed description of the annexed sheets of drawings which, by way of preferred example only, illustrate one specific embodiment of the invention.

On the drawings:

Figure 1 is an elevational view, partly in vertical section of an assembled tank-type vacuum cleaner embodying this invention;

Figure 2 is a side elevational view of the discharge end of the vacuum cleaner of Figure 1;

Figure '3 is a top elevational view of the vacuum cleaner of Figure 1;

Figure 4 is a partial side elevational view of the front end of the vacuum cleaner illustrating the removal of the end casing and dust bag;

7 Figure 5 is an enlarged scale, horizontal sectional view taken through the latch mechanism, showing the elements thereof in secured position;

Figure 6 is a view similar to Figure 5 but showing the latch elements in unlatched position;

Figure '7 is a sectional view taken on the plane V1I-VII of Figure 5;

Figure 8,is an enlarged scale elevational view of one of the rear end casing securing mechanisms; and

Figure 9 is a fragmentary vertical sectional view through the hinge mounting of the closure for the air discharge opening of the vacuum cleaner.

.. transverse Figure 10 is an enlarged scale sectional view taken on a radial plane XX of Fig. 1.

As shown on the drawings:

Referring to Figure 1, a vacuum cleaner embodying this invention comprises an elongated hollow casing member I!) having opposed open ends. An annular intake end casing member l2 cooperates with the forward open end of the main casing I and an annular discharge end casing member l4 cooperates with the rear open end of the main casing l0. While not limited thereto, the main casing Ill is preferably of non-cylindrical, yet arcuate configuration in cross section. the bottom portion of the casing having a larger radius of curvature than the top and side portions. The casing l0 may be conveniently formed by a rolling operation on a metal sheet to bring opposed edges of the sheet into juxtaposition whereupon they are suitably secured together as by riveting or welding.

Near the center of casing l0, an annular bulkhead I 6 ismounted within the casing in generally transverse relation thereto and such bulkhead is suitably shaped to define a forwardly facing annular shoulder I8 upon which a conventional filter element 20 is supported. The bulkhead l6 and filter 20 thus eficct a division of the interior of easing l0 into two compartments, re-' spectively, a dust bag compartment 22 on the forward side of bulkhead l6 and a blower unit compartment 24 on the rear side of bulkhead l6.

Immediately adjacent the rear side of bulkhead IS, a second annular bulkhead 26 is mounted, being pressed into the casing in generally relationship. Axlally rearwardly spaced from bulkhead 26 is a third annular bulkhead 28. Bulkhead 28 is, in fact, disposed adjacent the discharge end of easing l0. While the first and second bulkheads l6 and 26, respectively, are rigidly secured within the casing I0, having peripheral flanges l6 and 26', respectively, disposed in substantially sealing relationship with the interior walls of the casing II], the third bulkhead 28 has a peripheral flange 28' which is slidably insertable within the casing ill for assembly purposes. The central opening in bulkhead 26 is defined by an axially projecting annular flange 26a which extends toward the discharge or'rear end of casing l0. An axially projecting annular flange 28a is formed on bulkhead 28 projecting toward the flange 26a and preferably of the same exterior diameter. The bulkhead flanges 26a and 2811 are utilized to provide mounting seats for a pair of resilient mounting rings 30 which resiliently support a blower unit 32 so that the blower unit 32 may vibrate both axially or radially independently of the casing Ill. The blower unit 32 may constitute any conventional form of electric motor 32a and an impeller (not shown) which will produce an axial flow of air through the casing, Ill entering the intake and easing l2 and discharging through the discharge end casing l4. A mounting shroud or housing 34 is provided for blower unit 32 and may conveniently comprise a cylindrical member having axially projecting end portions 34a which project beyond radial end walls 32b of the blower unit 32. The blower unit 30 may then be resiliently supported within casing l 0 by permitting the axial projecting portions 34a of the shroud 34 to respectively rest upon the resilient rings 30.

It should be particularly noted that the rings 30 are secured in axial abutment between the radial wall portion of one of the bulkheads and the radial end wall portion 32b of the blower unit 32 and concurrently, in radial abutment between the axially projecting

flanges

26a or 28a and the corresponding axial projecting portion 34a of the shroud 34. It is therefore apparent that the blower unit 32 is resiliently supported for vibrations in an axial direction and in a radial direction. Accordingly, a, minimum of vibration is imparted to the casing I0 and therefore a minimum of noise is created by the operation of the blower unit 32.

It should be further noted that the axially projecting portions 340. of the shroud 34 overlap the

axial flanges

26a and 28a, respectively, so that a minimum of shearing force is exerted on the resilient rings 38-. By this construction, the resilient rings 30 may be formed from very soft rubber-like material, such for example as the so-called foam rubber. The use of such extremely soft rubber-like material further improves the vibration absorbing characteristics of the mounting and hence improves the noise reduction characteristics.

A novel mechanism is provided in accordance with this invention for achieving the securing of P the discharge end casing l4 to the main casing l8. Around the periphery of discharge end casing 14 there are provided a plurality of spaced integral cars 35. In the particular example illustrated, two such ears 33 are provided, being approximately diametrically separated and disposed approximately at the same vertical level. Each of the cars 36 is provided with an axially extending hole 36a extending therethrough. At similar positions on the discharge end of main casing ill, a plurality of retainer brackets 38 are suitably secured to the exterior surface of main casing in as by welding or riveting. Each of the bracket members 38 is of generally U-shaped configuration having a base portion 38a lying flush against and secured to the outer wall of main casing l0 and upstanding and somewhat forwardly projecting flnger portions 38b. The ends of finger portions 38b are each deformed in a somewhat'similar fashion so as to define a pair of opposed claw-like members 38c between which a square nut 4|! hay be inserted'by a generally radial movement with respect to the casing Ill. The claw-like portions 380 of the fingers 38b thus not only support the nut 40 but retain such nut against both axial and rotational movement. Accordingly, the insertion of a screw 42 through each of the apertures 35a in the ears 36 of discharge end casing I4 and the tightening of such screws into nuts .40 will draw the discharge end casing I4 into rigid engagement with th main casing I0.

Both the retainer brackets 38 and the ears 33 are concealed from view by a pair of trim strips 44.' Such trim strips are elongated member of generally channel shaped cross section and are suitably shaped so as to snugly conform to the side walls of main casing I0 and to completely surround the retainer bracket 38 and the ear 3| on the respective side walls. Such trim strip are suitably secured to the side walls of main casing l0 and discharge end casing M, as by screws 44a.

As was heretofore mentioned, the discharge end casing I4 is an annular member and preferably has a tapering arcuate exterior configuration to produce an overall streamlined appearance of the vacuum cleaner. Adjacent the small and of discharge end casing l4 a socket member 46 is mounted in any suitable manner. Socket member 46 is of annular configuration and extends inwardly into the interior of discharge end casing 14. Socket member 46 is provided to effeet a. coupling with a conventional air hose member (not shown) and a resilient sealing ring 46a is secured to the innermost end of coupling 46 to effect an air-tight seal engagement with such air hose coupling member. An identical socket member 46 is provided in a corresponding position in the intake end casing l2 and, as will be understood by those skilled in the art, an air hose coupling member may be selectively engaged in either the socket 46 at the intake end of the vacuum cleaner or the socket 46 at the discharge end of the vacuum cleaner, depending upon whether a suction or pressure current of air is desired.

.It has heretofore been the common practice to leave the openings in both the intake and discharge socket members uncovered so as to permit the hose coupling members to be quickly inserted in either end of the vacuum cleaner. Such arrangement greatly detracts from the overall appearance of the vacuum cleaner, since a large opening is always apparent at one end or the other and such opening abruptly interruptsthe otherwise pleasing exterior contour of the vacuum cleaner casing. Furthermore, it has been observed that when the Vacuum cleaner is used for suction cleaning operations, which is its most common usage, the opening in the discharge end casing I4 is a source of attraction for small children, who promptly attempt toinsert various foreign objects in such opening. The resulting danger of damage to the moving elements of the blower unit 32, and particularly to the commutator 0f the motor 32a is readily apparent.

Such defects of construction are eliminated in accordance with this invention by the provision of a closure member 48 which is pivotally mounted to discharge end casing M on a hinge 50. C- sure member 48 is thus movable between an opening and closing position with respect to the air flow passage in discharge end casing l4. A latch 52 is preferably provided to resiliently secure closure member 48 in its closing position. In such position, the exterior contour of closure member 48 is shaped so as to smoothly conform to the general line of the discharge end casing l4 and hence effect a substantial improvementin overall appearance of the vacuum cleaner. To permit substantially unimpeded airflow through the closure member 48 when in its closed position, a plurality of apertures 54 are provided therethrough. Apertures 54 are nevertheless of sumciently small size to prevent the possibility of any foreign objects of substantial size being inadvertently inserted therethrough into the interior of I discharge end casing l4.

In its open position, closure member 48 swings entirely out of the way of the central opening and discharge end casing 14 and hence permits a hose coupling member (not shown) to be inserted without difliculty into socket 46. If desired, a pair of opposed integral projectitons 48a may be provided on closure member 48 to provide a hand or finger hold for conveniently unlatching closure member 48 to move-it to its open position.

Intake end casing I2 is likewise of annular configuration and has an arcuate tapering exterior configuration. The large end face l2a thereof is suitably, shaped so as to conform to the configuration of the end face of a band member II which is rigidly secured to the intake end of main casing Ill. If desired, the intake end casing I2 may be aligned with respect to band II by the cooperation of an axially projecting lug Ila provber-like gasket member 66.

vided on the end face of band II with a correspondingly shaped recess l2b in intake end casing [2. It has been previously mentioned that an annular socket 46 is suitably mounted within the hollow central portion of intake end casing 12 so as to receive a hose coupling member (not shown) in air sealing relationship. An annular stamping 60 is secured within intake end casing l2 adjacent the large diameter end thereof by a plurality of screws 62 which pass through suitable holes in a generally radial flange 60a of such stamping and are threaded into an annular wall portion i2c integrally formed in the end casing l2. Stamping 60 is provided with an integral axially projecting portion 6% which projects a short distance'into the dust bag chamber 22 of the main casing ID. .A dust bag 62 is provided which is of the conventional cylindrical construction having the closed and 62a thereof disposed adjacent the filter element 20. The open end 62b of the dust bag 62 is suitably secured to a metallic mounting ring 64 which in turn is snugly engageable upon the axially projecting annular flange 60b of the stamping 60. Preferably a plurality of indentations 64a are provided in the interior surface of ring 64 to produce a definite frictional engagement between the ring 64 and the stamping 60.

With such construction, it is apparent that whenever the intake end casing I2 is removed from assembly with the main casing ID, the dust bag 62 will be carried therealong and will remain in assembly with intake end casing I2 until forcibly separated therefrom. This construction has the advantage that the dust bag 62 may be removed from the vacuum cleaner for emptying without incurring the common annoyance of spilling of debris from the dust bag immediately upon the removal of the intake end casing I! from assembly with the main casing ID.

The ring 64 is also provided with a radial flange 64b and this flange in turn is covered by a rub- When intake end casing I2 is firmly assembled to main casing to, the gasket 66 is compressed between a recessed annular end face llb on the band- II and an integral radial flange portion 60d provided on the stamping 60. Hence, leakage of air or debris from the periphery of the dust bag is effectively prevented.

Intake end casing I2 is secured in assembly to main casing ill by a plurality of novel latch units 10 constructed in accordance with this invention. In the particular example illustrated, two such latch units 10 are provided and are respectively located in general longitudinal alignment with the retaining brackets 38 on the rear end of easing H], which have heretofore been described. A pair of integral brackets Hd are formed on opposite sides of the band II and each bracket defines a generally vertical hole for receiving a pivot pin 12. An integral bifurcated support link 14 is provided having both armsthereof 14a and 14b traversed by pivot pins 12. At their other ends, the arms 14a and 14b are each traversed by a pivot pin 16 which in turn is mounted in a bracket 18 suitably secured to the inner base surface of a channel shaped operating member 80. At an intermediate point along link 14, 'a pivot pin 82 is mounted, being substantially parallel to pivot pins 12 and 16. A keeper link 84 has one end thereof rolled into generally cylindrical configuration indicated at 84a which is traversed by pivot pin 82. The other end of keeper link 84 is 7 bent to provide a hook or latching portion 84b. It is preferable that hook portion 84b be of cantilever construction and the entire link somewhat arched so that the link 84 is, to at least a limited degree, resiliently extensible.

A pair of locking projections l2c are integrally formed on intake end casing 12 at positions corresponding to the location of the latch units 10 on the main casing Ill. The keeper links 84 are of such length as to permit the cantilever hooks 84b to respectively engage behind the locking ears i2c when the link 14 is pivoted outwardly from the wall of main casing Hi. In this position, shown in Figure 6 a line drawn between the axis of pivot pin 82 of keeper link 84 and the effective point of engagement of the keeper link hook 8417 with the respective locking lug I20 will pass outwardly of the pivot pin I2. In such position, operating member 88 is positioned away from the wall of the main casing I8. However, as operating member 88 is manually moved toward an abutting position with respect to the wall of main casing III, the keeper link 84 is drawn rearwardly and inwardly. Such movement snugly engages the intake end casing I! in assembly with band II and effects a resilient elongation of keeper link 84. Such elongation reaches a maximum when a line drawn from the axis of pivot pin 82 to the effective point of engagement of keeper hook 84b with the locking lug [20 passes through the axis of pivot pin 12. Further movement of operating member 80 toward an abutting position with respect to the side wall of the main casing in moves the keeper link 84 past its dead center position and the resilient tension therein effects a snapping of the latch unit to the secured position shown in Figure wherein a line drawn from the axis of keeper pivot pin 82 to the point of contact of keeper hook 84b with the locking lugs I20 passes on the inner side of pivot pin I2. In this same position, the operating member 88 is pulled by link 14 into abutting engagement 1 with the side walls of main casing III.

In accordance with this invention, the operating member 88 may be conveniently shaped as ,an elongated member of channel-shaped cross tive latch units 10 and, in addition, the projecting locking lug I on the intake end casing l2. Hence, when the intake end casing 12 is assembled to the main casing II and the latch unit 10 manipulated by the operating members 80 to their secured position, none of the elements of the latch unit 18 will be visible and the operating member 88 will appear to be a continuation of the trim strip. The resulting improvement in appearance of the vacuum cleaner is deemed to be obvious but it is desired to also point out that the effective enclosure of all the elements of the latch unit completely eliminates the possibility of such elements snagging the clothes or stockings of the operator of the sweeper or other persons who may happen to pass by the sweeper when it is in use or storage.

To facilitate the positioning of the keeper link 84 with respect to the respective locking lug I20, a torsion spring 86 may be provided which is wrapped around pivot pin 16 and operates between keeper link 84 and operating member 88, tending to urge keeper link 84 out of the operating member 80. The movement of keeper link 84 in its direction of bias by the spring 86 is limited by a pair of hook-like projections 88 which are integrally formed on the bracket member I8.

Along the top of the main casing ID, a combined trim strip. and handle member 88 is mounted. Such member is secured to the casing l0 near its discharge end by a screw 88a and near the intake end thereof by a projecting lip portion 88b which extends into an undercut recess Hd formed in the band ll.

An upwardly opening recess Me is provided in the top portion of discharge end casing l4 in general alignment with the handle member 88. Such recess provides convenient mounting space for a pivotally mounted pedal which is operatively connected to the control switch 92 for the blower motor 32a so as to successively energize and deenergize such motor by successive vertical depressions of the pedal 98. The mounting of the switch pedal 90 in general alignment with the handle member 88 again simplifies the exterior lines of the vacuum cleaner and contributes substantially to the streamlined, yet attractive appearance thereof.

If desired, a pair of longitudinal skids 86 may be suitably secured on each side of the base portion of the main casing I!) so as to permit the entire vacuum cleaner to be readily pulled over a floor or ru-g surface during cleaning operations.

It is therefore apparent that the aforedescribed vacuum cleaner construction provides a vacuum cleaner of improved performance so far as casing vibration and noise level are concerned; of pleasing and simplified appearance by virtue of the covering of the retainer brackets 38 by the trim strips 44 and the enclosing of the latch elements 10 by the operating members 88 which constitute in effect a continuation of the adjacent trim strip; of improved safety by virtue of the provision of the movable closure member 48 for the air discharge opening of the vacuum cleaner, and capable of being interchangeably manufactured in large quantities at substantial savings in cost over vacuum cleaner construction heretofore known.

It will, of course, be understood that various details of construction may be varied through a wide range without departing from the principles of this invention and it is, therefore, not the purpose to limit the patent granted hereon otherwise than necessitated by the scope of the appended claims.

I claim as my invention:

1. In a vacuum cleaner, a hollow elongated casing, a pair of annular bulkheads disposed transversely of said casing and longitudinally spaced in said casing, each of said bulkheads having an axially projecting flange, said flanges projecting toward each other, a blower unit for producing air flow through said casing disposed between said bulkheads, casing means for said blower units having axially projecting end portions constructed to respectively surround a portion of the adjacent flange, and a ring of soft, rubber-like material disposed between each of said end portions and the adjacent flange, whereby said blower unit is resiliently supported to producing airflow through said casing disposed between said bulkheads, a cylindrical shroud surrounding said blower unit and having axially projecting end portions constructed to respectively surround a portion of the adjacent annular flange, and a ring of soft rubber-like material disposed between each shroud end portion and the adjacent annular flange, whereby said blower unit is resiliently supported to vibrate both axially and radially independently of said casing.

3. Ina vacuum cleaner. a hollow elongated casing, a pair of annular bulkheads disposed transversely of said casing and longitudinally spaced therein, each of said bulkheads having a radial wall portion and an adjacent axially projecting annular flange, said flanges projecting toward each other, a blower unit for producing airflow through said casing disposed between said bulkheads, a housing for said blower unit having radial end wall portions and surrounding axially projecting annular end portions constructed to respectively surround'a portion of the-adjacent annular flange, and a ring of soft rubber-like material disposed in radial abutment between each axially projecting end portion and the annular flange of the adjacent bulkhead and in axial abutment between said radial end wall portions of said housing and said radial wall portion of the adjacent bulkhead, whereby said blower unit is resiliently supported in said casing to vibrate both axially and radially independently of said casing.

4. In a vacuum cleaner, a hollow casing open at each end, blower means in said casing for drawing air in one open end and discharging air through the other open end, annular socket members disposed in said casing respectively adjacent the intake and discharge end thereof, said socket members being adapted to selectively receive an air hose connection, and a cover member pivotally secured to said casing and positionable in open and closing relationship with respect to said discharge opening of said casing, said cover member having a plurality of apertures therethrough to permit substantially unimpeded discharge of air therethrough in its said closing position.

5. In a vacuum cleaner, a hollow casing open at each end, blower means in said casing for drawing air in one open end and discharging air through the other open end, annular socket members concentrically disposed in said casing respectively adjacent the intake and discharge ends thereof, said socket members being adapted to selectively receive an air hose connection, and a cover member pivotally secured to said casing and positionable in open or closing relationship with respect to said discharge opening of said casing,

means for latching said cover member in said ,closing position, said cover member having an arcuate exterior surface shaped at its edges to conform to the exterior surface of said casing,

and said cover member having a plurality of apertures therein to permit substantially unimpeded discharge of air therethrough in its said closing position.

GEORGE M. KELLY.

REFERENCES CITED The following references are of record in the file of this patent:

Lofgren Mar. 2, 1944 I