US 2409082 A
Description (OCR text may contain errors)
rNvENToR lzarles Troxler ATTORNEY 0t.s,1946.. c, @,TROXLER 2,409,082
sUcTIoN 'CLEANER Filed April 19, 1945 2 Sheets-Sheet 2 INVENTORk lzarles TroXler ATTORNEY Patented Oct. s, 1946 PATENT i FFHCE SUCTIGN CLEANER'Y Charles G. Troxler, Canton, Ohio, assigner to The Hoover Company, North Canton, Ohio, a corporation of Ohio- Application April 19, 1943, Serial No. 483,557"
position for the surface covering upon which it,
It is an object of the present invention to provide a new and improved suction cleaner.. It is another object of the invention to provide a new and improved nozzle-height-adjusting means for a suction cleaner. vention is to provide a new and improved semiautomatic nozzle-height-adjusting means in a suction cleaner. invention is to provide a simplified construction which provides for semi-automatic nozzle height adjustment upon the operator depressing andthen releasing a foot-actuated lever. A still further object of the invention is to provide a. suction cleaner in which the rear supporting wheels of the machine are movably mounted upon the cleaner and are positionable relative thereto for the purpose of raising and lowering the nozzle height in a semi-automatic manner upon the exertion of an actuating force by the operator and without the necessity for the operator to use judgment in the adjustment.` These and other more specific objects will appear upon reading the following specication and claims and upon considering in connection therewith the attached drawings. 4
Referring now to the drawings in which a preferred embodiment of the invention is illustrated and in` which the same, reference char` acter refers to the same parts throughout:
Figure 1 is a side elevation of a cleaner constructed in accordance with the present invention with a part of the side wall of the cleaner broken away to show the semi-automatic nozzlei height-adjusting means in an intermediatel position during anY adjustment and with the foot lever depressed;
Figure 2 is a bottoni View of the cleaner illustrated in Figure l;
Figure 3 is a view similar to Figurel butwith the foot-operated lever released and the cleaner nozzle positionedin the adjusted operating position A further object of the in A still further object of theA Y 2 o ,Figure 4 is a section upon the line of Figure 3.
The modern suction cleaner is adapted to clean surface coverings of various types. These coverings vary in thickness, in stiffness, in porosity, in
' weight and in pile density. The surface covering.,
having a long soft pile will ordinarily be rather heavy while a covering having a short pile Will` usually be rather thin. For proper loperation upon these various coverings it is desirablethat the nozzle of a suction cleaner being used thereon be. properly adjusted accordingto the characteristics of the covering. In the suction cleaner constructed in accordance with the present ini vention to adjust properly for thev coverings to be cleaned it isnecessary onlyY for the operator to-positi'on the cleaner thereon and thereafterl to depress a foot lever. rShe depression ofthe foot lever permits the nozzleto drop down into contact with thesurface covering to determine the ,plane of the top, surface thereof.V Thereafter the release of thefoot lever permits the engagement of certain mechanisms which result in the raising of the nozzle to an optimum position above the position which it had when supported by thel covering 'andthemachineis then ready for operation.
semi'fautomatie adjustments oftnis type have" previously been provided in more complicated formand thelpresent invention constitutes` an.
improvement thereover., Such a prior artconstruction. is` that illustrated in the patent to Charles H.' Taylor,12,183,826;
Referring again to the drawings a modern suction cleaner is seen to be illustrated and to comprise a nozzle i having front and rear suri'ace contacting lips 'and 3. An air'passageway f extends rearwardly'from the' nozzle I to the inlet 6 `of the fanY chamberY l which contains a rotary suction-creatingfan Scarried by a depending motorVv shaft 9.
lips 2 and 3; through the air passagewayv linto the fan chamber and to exhaustit. rearwardly therefrom through an .exhaust'outlet H; The
driving motor-fertile fan is not illustrated butV is to be'understood tobe of anyordinary and well known; type and to-be positioned within the overlying motor casing` i2. The body ofthe cleaner is formedv with outwardly and downwardly eX- tendi'ng side walls or skirts i3 which extend rearwardly-from the nozzle l to the rear of the ma.- chine where they extend transversely across the exhaust outlet H tobe formed as a rear wall I4. Rear wall lil carries at its opposite sides apair The fan functions to-` drawcleaning air into the-.nozzle i between thek of threaded pins I6 upon the outer ends of which seat manually rotatable nuts I1. The latter function to clamp to the rear wall I4 the ring I8 which comprises the mouth of the bag I9 connected interiorly to the exhaust passageway II.
The cleaner is movably supported by means of spaced front wheels 2l, which are carried by shafts 22 connected to the side walls I3, and by rear wheels 23. These latter are movably and adjustably connected to the cleaner body in a manner which will be fully set forth. As in the usual suction cleaner a pivoted handle 24 is provided which provides means by which the operator can propel the machine when in use.
The rear supporting wheels 23 are pivotally supported upon the underside of the cleaner body by a U-shaped bracket 26. Bracket 26 is formed with a pair of forwardly extending arms which could well be mounted for pivotal movement on the underside of the casing about any desired axis but which are shown as pivotally connected to the supporting shafts 22 of the front wheels 2I. A transverse shaft 21 rotatably carries the wheels 23 on bracket 26 at the rear thereof, the bracket being at al1 times spring-pressed downwardly by coil spring 28 in a manner which tends to lift the rear of the machine. A catch comprising a vertically extending arm 3l with a hook at the upper end thereof is carried by one arm of bracket 26 and is adapted to engage an abutment 32 to limit the angular movement of the bracket 26 relative to the cleaner body under the actuation of the coil spring 28.
` On the underside of the cleaner body at a point immediately over the rear wheel-carrying shaft 21 is a downwardly extending bracket 33 provided with a plurality of vertically spaced outwardly extending rigid pins 34 which are,accordingly at various distances from the wheels 23 and so shaft 21. A foot lever 36 formed as a bell crank is pivotally mounted upon the extended end of shaft 21 atr one side of the pair of wheels 23 and, as is clearly illustrated in the drawings, extends outwardly and to the side of the adjacent cleaner side iwall I3. The upper end of the bell crank arm, that is foot lever 36, is formed as a cam surface 31 the outer or upper end of which is at a greater radius from the pivotal axis, comprising shaft 21, than is the inner or lower end thereof. Cam surface 31 is adapted to engage selectively the pins 34 which are carried by the depending bracket 33 when the foot lever pivots in a counter clockwise direction from the position illustrated in Figure 1 into which it has been depressed by the operator. The movement of the cam surface 31 past the pin 34 is prevented by the lower or inner end thereof being slightly hooked. YA coil spring 38 on the rear wheel shaft 21 acts at all times to pivot the lever 36 in a counter clockwise direction, as shown in Figure 1, and tends to secure the pin which is in engagement with the cam surface 31 in seating relationship with the hooked end thereof.
The foregoing comprises the construction of the cleaner constructed in accordance with the present invention. The invention is applicable to a cleaner with or without an agitator and in the embodiment illustrated a rotary agitator 4I of the usual and well known type embodying rigid beater elements and flexible brush elements has been shown as rotatably mounted within the cleaner nozzle where it is driven by a, power-transmitting belt 42 which connects to the lower end of the motor drive shaft 9. The invention is as applicable, however, to a machine which is unprovided with an agitator.
The operation of the cleaner constructed in accordance with the present invention is as follows. The cleaner being placed upon a surface covering which is to be cleaned, the operator depresses the foot lever 36 thereby moving it from a position as illustrated in Figure 3 to that illustrated in Figure l. Thereupon the coil spring 28 forces the rear of the machine upwardly pivoting the body rabout the front supporting wheel shafts 22 as an axis. The front of the machine is forced downwardly until the surface-contacting lips 2 and 3 rest upon the top plane of the supporting surface, their areas being sufficient to prevent appreciable penetration. The front and rear supporting wheels are supporting the large part of the cleaner weight and have penetrated the supporting surface to a distance sufficient to give a firm foundation. Further pivotal movement of thev cleaner -body about the front supporting wheels is prevented by the Contact of the nozzle lips with the covering and a denite angular relationship exists between the supporting body and the pivoted bracket 26. Likewise, the distance spacing the position pins 34 above the rear supporting axle 21 of the rear supporting wheels 23 is determined.
l Thereafter the operator releases the foot lever 36 and that element is pivoted in a counter clockwise direction from the position shown in Figure 1 under theactuation of spring 38. Now depending upon the angular relationship existing between the body of the cleaner and the rear Wheelcarrying bracket 26 at least one of the pins 34 will be in such a position above the axle 21 that it will be engaged by the cam surface 31 of the foot lever 36 in the pivotal movement of the latter. 1f the supporting surface covering was relatively thin the front of the machine would have a relatively low position which would mean that the rear of the machine would be relatively high and in such an instance probably the cam surface would engage the lowermost pin 34. 1n the case of a very thick surface covering the wheels would sink deeper into the pile, the front of the machine would be relatively high and accordingly the rear of the machine would vbe relatively low, and the cam surface would probably engage the top supporting pin 3B. Correspondingly in av medium type surface covering it would be the middle pin 34 which would be engaged. l
Three positioning pins 34 have been illustrated but obviously the number thereof can be varied as desired and as warranted by the neness of the adjustment necessary.
As the cam surface 31 engages the proper pin 34 in the pivotal movement of the lever 36 it continues its vmovement relative thereto under the actuation ofv the coil spring 38 which is of sufficient strength to move the surface along the pin to cam the latter downwardly until the pin finally seats in the hooked end of the cam surface. As the came surface at its innermost or lower-end is nearer to the rear-wheel-carrying shaft 21 than at its upper or outer end it is clear that the pivotal movement of the foot lever has resulted in the camming or forcing downwardly of the rear of the machine to an extent determined bythe contour of the cam 31. The coil spring 2S has been compressed by this movement, thespring'SS being suiiciently strong to accomplish that result. The movement of the rear of the machine has produced a lifting at the front or nozzle end thereof. The distance whichthe nozzle is raised above its position in contactwitlt the supporting surfaceV is.; dependent upon the' curvature of. the cam 3T whichxwaslpredeteremined to be that which would properly' position'` the nozzle above the supportingplane-z.as'` deter-- mined by the nozzle lips 2 and 32th'emselveswhen resting upon the supporting surface..
'The cleaner in the'adjustediposition4 is'srelated:
as illustratedi in r`" igu1e.3vl andy will continue in-V that position until readjusted andwith the-nozzle positioned above the supportingsurface in a `posi'-r tion .in which it candraw orflift'thefsurfa'c'efcovering upwardly by virtue off the suction therein'in cleaner operation. Wh'enuso relatedltheoperator; need. only close the :control switclrforthei cleaner andihemachine will bei anjk operating' uniti func'- tioning Yto clean thesurfacecoveringiuporr which'.
l. In a suction cleaner, a body including a nozzle, a front wheel fixed to said body, a rear wheel, a bracket pivotally connecting said rear wheel to said body, a spring urging said bracket from said body to raise the rear of said body and to pivot said body about said front wheels, fixed abutments on said body at different distances from said bracket, an operator-operated lever pivoted on said bracket and formed with a cam surface adapted to engage selectively said abutments and to cam said bracket and body together, and a second spring urging said lever in a direction to bring said cam surface into engagement with said abutment, said lever being adapted to move in the opposite direction under an operator-supplied force to separate said cam surface and one of said abutments to permit said first spring to force the rear of the cleaner upwardly and the nozzle downwardly into contact with an underlying surface.
2. In a suction cleaner, a body including a nozzle adapted to cooperate with an underlying surface covering, a first supporting wheel adapted to cooperate with the underlying surface covering mounted on said body, a second supporting wheel adapted to cooperate with the underlying surface covering, means for adjustably mounting the second supporting wheel on said body for pivotal movement of the body about said first supporting wheel to raise and lower the nozzle with respect to the surface covering, a plurality of vertically spaced abutments on said body adapted for adjusting the optimum operating position of the nozzle with respect to the surface covering, operator-operated means adjustably carried by Said means for adjustably mounting the second supporting wheel adapted to selectively engage each one of said abutments, means for biasing the second supporting wheel whereby the second supporting wheel and the body are moved relative to each other upon release of the operator-operated means from engagement with one of said abutments causing the nozzle to contact the surface covering, said operator-operated means including a cam surface adapted selectively to engage one of said abutments as determined by the relative adjustments of said body and second supporting wheel effected by the position of the nozzle on the surface covering, and second biasing means acting to effect engagement of said adjustable cam surface with one of said abutments and to move said cam surface relative thereto to effect an adjustment of said second supporting wheel relative to said body in opposition to said rst mentioned means for biasing the second supporting wheel, whereby the nozzle is positioned 6 a'bovethe surface; coveringrifor.' ani opti-mum; operi# atingposition.thereabove;v l y 3;. In; a suction"cleaner,v al first partk comprising a body including a-,nozzleadapted-to dropfdown into contact with an underlying surfacecovering and' told'eterminetl'ieuolan'ev of thev aforesaidztop': surface: thereof., saidi rsti partL also.; comprising a' first supporting?, whf'eelsfixedl to?` said. body;` a; secondipart comprising a second supporting wheels nroyablei relative to said body; ,an'dmeans Lto adi-e.r j-ustsaid secondi: sup'porting;wheel.i= relativeato` said-1y body to position saldi.'nozzlerelativeht saidsulf-L face covering tnrougn determining. the.' angular: positionv of said body?` onl` .said firstsupporting.'
i wheel,- said nieanslinciudingl a' pluralityof fixed-r contacts carriedby oneLoi saidpartsandamovable'- operator-operablec element carried; by-f theV other part and provided Wlitnab cam- `sur-face adapted selectively to'en'gage said?l fixed contalei'fs,lv said cam 4surface Y shaped' as-V to cam saidf second-1 supporting wheel relative to said body to alter its position relative thereto to raise said nozzle from a position in contact with said surface covering for determining the plane of the top surface thereof to an optimum operating position thereabove.
4. In a suction cleaner, a body including a nozzle having surface-contacting means adapted to Contact with an underlying supporting surface and to determine the plane 0f the top surface thereof, a rst wheel fixed to said body and about which the body is adapted to tilt to vary the adjustment of said nozzle relative to the supporting surface, a second wheel, a mounting movably connecting said second wheel to said body, said body and said mounting being angularly adjustable, and adjustment means carried by said body and said mounting to determine the angular relationship therebetween and to fix the position of said second wheel relative to said body comprising vertically spaced means and movable means adjustable relative thereto and selectively engageable therewith, one of said means being formed as a cam surface to adjust said mounting relative to said body, the selective engagement of said movable means with said fixed means being determined by the angular relationship of said body and said mounting with the surfaceconnecting means of said nozzle supporting the body on the supporting surface and determining the plane of the top surface thereof, characterized in that said cam surface is so shaped as to raise said nozzle with its surface-contacting means in contact with the supporting surface and determining the plane of the top surface thereof to an optimum operating position thereabove.
5. The construction recited in the preceding claim characterized in that spring means exert a force between said mounting and said body to force said surface-contacting means against the supporting surface in the form of a surface covering, with said xed means and said movable means out of engagement to determine the selective engagement of said movable means and said xed means for the particular surface covering,
6. The construction recited in the second preceding claim characterized in that first spring means exert a force between said mounting and said body to force said surface-contacting means against the supporting surface in the form of a surface covering with said fixed means and said movable means out of engagement and in that second spring means act upon the movable means to move the latter into engagement with and rel- 7 ative to said fixed means with suliicient force to cam the latter to adjust said mounting relative to said body a predetermined amount in opposition to said rst spring means.
, '7. In a suction cleaner, a rst part including a body adapted to contact and rest upon an underlying surface in a predetermined manner and including a, nozzle providing gauging means to determine the plane of the underlying surface and a. first supporting wheel xed to said body, a second part including a second supporting wheel movable relative to said body, said body and said second supporting wheel being angularly adjustable, and means to adjust said second supporting wheel relative to said body to posi-tion said nozzle relative to said surface through determining the angular position of said body on said supporting wheel, said means including cooperating selectively engagable cam means carried by said first and second parts, the cooperating cam means on one of said parts being movable relative thereto under an operator-supplied force, irst spring means to urge said body into surface-contacting position with said cam means disengaged to determine the plane of the underlying surface by the aforesaid gauging means, and second spring means urging the movably mounted cooperating cam means into engagement with the xedly mounted cooperating cam means, characterized in that said cam means are so related as to tilt said body on said first supporting Wheel to adjust the nozzle to an optimum operating position above the plane of the underlying surface predetermined by the aforesaid gauging means and in that said second spring means exerts a suflcient force on said movably' mounted cooperating cam