CA1331262C - Hand vacuum cleaner - Google Patents
Hand vacuum cleanerInfo
- Publication number
- CA1331262C CA1331262C CA000615685A CA615685A CA1331262C CA 1331262 C CA1331262 C CA 1331262C CA 000615685 A CA000615685 A CA 000615685A CA 615685 A CA615685 A CA 615685A CA 1331262 C CA1331262 C CA 1331262C
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- CA
- Canada
- Prior art keywords
- motor
- cooling air
- air
- housing
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
ABSTRACT
A hand-held vacuum cleaner including a housing comprising mating first and second half housing elements, said housing having a handle and a nozzle, a motor having means for drawing cooling air through the motor, a selectively-separable bag assembly, a working air channel for communicating working air from said nozzle to said bag assembly, and a motor mount portion receiving said motor and spaced from said working air channel by a motor mount portion peripheral wall; said motor mount portion including a peripheral motor cooling air intake chamber, a peripheral motor cooling air exhaust chamber and a peripheral baffle wall extending from a housing outer wall to contiguous engagement to said motor, said housing outer wall including a plurality of air inlet vents at said cooling air intake chamber for cooling air inflow to said motor from said intake chamber, and air outlet vents at said cooling air exhaust chamber, for cooling air exhaust from said motor through said exhaust chamber, said inlet and outlet vents being oppositely spaced about said baffle wall, said means for drawing cooling air through the motor causing the cooling air to enter said inlet vents and chamber and exit the outlet chamber and vents; said sealing peripheral wall adjacent said working air channel sealing said intake and exhaust chambers from said channel to preclude cooling air in said cooling air intake and exhaust chambers from mixing with working air in said working air channel.
A hand-held vacuum cleaner including a housing comprising mating first and second half housing elements, said housing having a handle and a nozzle, a motor having means for drawing cooling air through the motor, a selectively-separable bag assembly, a working air channel for communicating working air from said nozzle to said bag assembly, and a motor mount portion receiving said motor and spaced from said working air channel by a motor mount portion peripheral wall; said motor mount portion including a peripheral motor cooling air intake chamber, a peripheral motor cooling air exhaust chamber and a peripheral baffle wall extending from a housing outer wall to contiguous engagement to said motor, said housing outer wall including a plurality of air inlet vents at said cooling air intake chamber for cooling air inflow to said motor from said intake chamber, and air outlet vents at said cooling air exhaust chamber, for cooling air exhaust from said motor through said exhaust chamber, said inlet and outlet vents being oppositely spaced about said baffle wall, said means for drawing cooling air through the motor causing the cooling air to enter said inlet vents and chamber and exit the outlet chamber and vents; said sealing peripheral wall adjacent said working air channel sealing said intake and exhaust chambers from said channel to preclude cooling air in said cooling air intake and exhaust chambers from mixing with working air in said working air channel.
Description
1~31262 HAND VACUUM CLEAN~R
Back round of the Invention .
This invention per~ains to the art of vacuum cleaner devices and more particularly to a hand vacuum cleaner.
The invention is particularly applicable as a device for suction cleaning items and places where conYentional larger sized vacuums are inconvenient and, more particularly, where a hand held vacuum with a revolving brush that provides a Yibrating and sweeping action is particularly advantageous.
Yarious forms and types of hand vacuums have heretoore been suggested and employed for both commercial and domestic use, all with varying degrees of success. It has been - found that these prior hand vacuums have suffered from a variety o problems which limit their practical and eronomic valueO
A principal problem with these prior art devices is that in order to obtain powerful suction with a revolYing brush the hand vacuums have ~een relatively heavy since they have typically been constructed of a metal casing to support a ` 20 powerful suction motor and absorb the vibrations of a revolving brush. In addition, it has been found that a ~etal casing has been necessary to withstand the forces of impinging articles against the casing walls which have been propelled against the walls by the cleaner during operation. Mere lightweight .~
plastic mater~als have been unable to withstand the forces of such impinging articles over a period of time wi~hou~ risk of damage to the casing i~self, or, at worst, propelling an item out from a broken casing towards an operator of the cleaner.
Another common problem with hand held vacuum cleaners is the provision of a convenient yet effective means for , ~
~3~2~2 Il ~ sealing a dirt and soil collecting bag to the cleaner housing.
, ~: It is important that the bag may be easily separable from the ¦ cleaner for emptying, but it is also important that a dust tight seal be made upon reattachment of the bag to ~he cleaner and that such dust tight seal must be capable of being maintained over a large number of operations of removal and reattachment of the bag. Most conventional type hand vacuum Ij cleaners which merely use an elastomeric gasket in combination ¦ with a mechanical camming device to seal the bag to the vacuum lQ housing have been unsuccessful over a period of time due to deformation of the gaskee and mechanical relaxation of the camming parts. As dl~st leaks from such a hand vacuum during operation, it is particularly noticeable ~o an operator and, accordingly, a most unattractive and undesirable type of cleaner failure.
Another problem with prior hand held vacuum cleaner designs, and particularly those including a revolving brush in the cleaner nozzle, is the provision of an efficient means of translating the torque forces from the motor to the fan and 2Q revolving brush while minimizing vibration to the housing and bcaring elements and to maintain these elements in the assembly in a secure manner. Typically, prior art designs have employed : ~ .
j~ mechanical fastening devices which have not only added weight to the construction, but are still susceptible to loosening due to the vibrational forces of the cleaner.
Yet another problem with prior hand held vacuum :
cleaner designs has been the disadvantages associated with cooling the vacuum motor with working air laden with dirt and dust particles. Due to the desirability of keeping a hand vacuum as compact as possible, problems have developed in designing a cooling air flow path which could be segregated from the working air.
Back round of the Invention .
This invention per~ains to the art of vacuum cleaner devices and more particularly to a hand vacuum cleaner.
The invention is particularly applicable as a device for suction cleaning items and places where conYentional larger sized vacuums are inconvenient and, more particularly, where a hand held vacuum with a revolving brush that provides a Yibrating and sweeping action is particularly advantageous.
Yarious forms and types of hand vacuums have heretoore been suggested and employed for both commercial and domestic use, all with varying degrees of success. It has been - found that these prior hand vacuums have suffered from a variety o problems which limit their practical and eronomic valueO
A principal problem with these prior art devices is that in order to obtain powerful suction with a revolYing brush the hand vacuums have ~een relatively heavy since they have typically been constructed of a metal casing to support a ` 20 powerful suction motor and absorb the vibrations of a revolving brush. In addition, it has been found that a ~etal casing has been necessary to withstand the forces of impinging articles against the casing walls which have been propelled against the walls by the cleaner during operation. Mere lightweight .~
plastic mater~als have been unable to withstand the forces of such impinging articles over a period of time wi~hou~ risk of damage to the casing i~self, or, at worst, propelling an item out from a broken casing towards an operator of the cleaner.
Another common problem with hand held vacuum cleaners is the provision of a convenient yet effective means for , ~
~3~2~2 Il ~ sealing a dirt and soil collecting bag to the cleaner housing.
, ~: It is important that the bag may be easily separable from the ¦ cleaner for emptying, but it is also important that a dust tight seal be made upon reattachment of the bag to ~he cleaner and that such dust tight seal must be capable of being maintained over a large number of operations of removal and reattachment of the bag. Most conventional type hand vacuum Ij cleaners which merely use an elastomeric gasket in combination ¦ with a mechanical camming device to seal the bag to the vacuum lQ housing have been unsuccessful over a period of time due to deformation of the gaskee and mechanical relaxation of the camming parts. As dl~st leaks from such a hand vacuum during operation, it is particularly noticeable ~o an operator and, accordingly, a most unattractive and undesirable type of cleaner failure.
Another problem with prior hand held vacuum cleaner designs, and particularly those including a revolving brush in the cleaner nozzle, is the provision of an efficient means of translating the torque forces from the motor to the fan and 2Q revolving brush while minimizing vibration to the housing and bcaring elements and to maintain these elements in the assembly in a secure manner. Typically, prior art designs have employed : ~ .
j~ mechanical fastening devices which have not only added weight to the construction, but are still susceptible to loosening due to the vibrational forces of the cleaner.
Yet another problem with prior hand held vacuum :
cleaner designs has been the disadvantages associated with cooling the vacuum motor with working air laden with dirt and dust particles. Due to the desirability of keeping a hand vacuum as compact as possible, problems have developed in designing a cooling air flow path which could be segregated from the working air.
.. . ., . . ~ .. - .
i.
:~33~2~2 Yet a:nother problem with hand held vacuum cleaners due to their compactness has been ehe interference of objects drawn in by the working air with th~ Yacuum an a~ter the particl~s hav~ been collected into th~ vacuum bag when they are not inhibited from rolling back ~o the fan after the cleaner has been turn~d off. This is a particular problem in hand held vacuum rleaners where the cleaners ar~ opera~ed in a variety of different positions and si~uations and it is likely or gravitational forces to urge solid objects back towards the nozzle of the cleaner.
The presen~ invention cont~mplates a new and improved hand vacuum cleaner which overcomes all the above referred to problems and others to pro~ide a new hand vacuum which is simple in design, economical to manufacture, compact and lightweight, but provides powerful suction action with a revolving brush, readily adaptable to a plurality of uses in a ~ari~ty o~ cleaning situatio~s, easy to assemble, easy to operate, eas~ to detach, empty and reattach the clean~r bag and which provides improved hand vacuu~ cleaner operation.
~rie~ Sum~ary of the Invention It i~ an a~pect o~ this invention to provid~ ~ hand-held vacuum cleaner including a housing comprising mating ~irst ~nd second hal~ housing e~emen~ aid housing ~aving a handle and a nozzle, a motor having means for drawing coolin~ air through the motor, a selectively-separable bag assembly, a working air channel for co~municating worklng air ~rom said nozzle to said bag as~embly, and a motor mount portion receiving 6aid motor and spaced ~rom said ~orking air channel by a motor mount portion peripheral wall; said motor mount portion . . .
.
--~: -~3~262 including a peripheral motor cooling air intake chamber, a peripheral motor cooling air exhaust chamber and a peripheral baffle wall extending from a housing outer wall to contiguous engagement to said motor, said housing outer wall including a plurality of air inlet vents at said cooling air intake chamber for cooling air inflow to said motor from said intake chamber, and air outlet vents at said cooling air exhaust chamber, for cooling air exhaust from said motor through said exhaust chamber, said inlet and outlet vents being oppositely spaced about said baffle wall, said means for drawing cooling air through the motor causing the cooling air to enter said inlet vents and chamber and exit the outlet chamber and vents; said sealing peripheral wall adjacent said working air channel sealing said intake and exhaust chambers from said channel to preclude cooling air in said cooling air intake and exhaust chambers from mixing with working air in said working air channel.
It is another aspect of this invention to provide a hand-held vacuum cleaner including a housing comprising mating first and second half housing elements, said housing having a handle and a nozzle, a motor having means for drawing cooling air through the motor, a selectively-separable bag assembly, a working air channel for communicating working air from the said nozzle to the said bag assembly, a motor mount portion receiving .25 said motor and spaced from said working air channel by a motor mount portion peripheral wall; said motor mount portion including a peripheral motor cooling air intake chamber, a peripheral motor cooling air exhaust chamber and a peripheral baffle wall extending from a housing outer wall to adjacent said motor, said _ 5 _ ~312~2 : " .
.......
/
, ~ : - 6 -::
~ ~3~ ~X2 housing outer wall including a plurality o~ air inlet vents at said cooling air intake chamber, disposed in at least one of said first and second half housing elements for cooling air inflow to said motor, and air outlet vents at said cooling ~ir exhaust chamber disposed in at least one of said first and second half housing elements for cooling air exhaust ~rom said motor, said inlet and outlet vents being spaced on opposite sides of said baffle wall, said means for drawing cooling air through the motor causing the cooling air to enter said inlet vents and cha~ber and exit the outlet chamber and vents; said motor mount portion peripheral wall adjacent sai~ working air channel sealing said intake and exhaust chambers from said channel to preclude cooling air in said cooling air intake and e~haust chambers from mixing with working air in said working air channel.
Brief D~scription of the Drawin&~
The invention may take physical form in certain parts an~ arra~gements of parts, ~he preferred emb.odimen~ of which will be described in detail in the speciication and illustrated in the accompanying drawings which form a part hereof and whsrein:
FIGU~E 1 is a side eleYational view of a hand vacuum formed in accordance with the present invention;
`' 25 FIGUR~ lA is a cross-sectional view taken along line l~-lA o FIGURE 1 particularly illustrating asse~bly aid wire grooves in the Yacuum handle;
FIGURE 2 is an enlarged cross-sectional view of the hand vacuum housing;
2 ~ 2 ~IGURE 2A is an enlarged sectional view of FIGURE 2 particularly illustrating the tongue in groove assembly of the housing;
PIGURE 2B is a cross-sectional view taken along line 2B-2B of ~IGURE 2A;
FIGURE 2C is an enlarged sectional view of FIGURE 2 particularly showing the elastomeric retaining ring of the bag assembly as it is received on the hand vacuum housing;
FIGURE 2D is an enlarged sectional view of FIGURE 2 taken along lines 2D-2D particularly showing an air vent slot construction;
FIGURE 3 is a cross-sectional view taken along line 3-3 of FIGURE 2;
FIGURE 4 is an enlarged front elevational view with partial cutaways in section of the present invention;
FIGURE 5 is a cross-sectional view taken along line 5-5 of FIGURE 4;
FIGURE 6 is a cross--sectional view taken along line 6-6 of FIGURE 4; and FIGURE 7 is an enlarged elevational view in partial section of the motor and fan assembly.
Detailed Description of the Invention ~eferring now to the drawings wherein the showings are . 20r purposes of illus~rating the preferred embodiment of the invention only`and not for purposes of limiting same, the FIGURES show a hand vacuum device comprised of a housing 10 and selectively separable bag assembly 12.
More specifically, and with reference to FIGURES 1 and . 2, the vacuum housing 10 includes a motor mount portion 163 a fan chamber 18, a nozzle 20 and a handle 22. An annular bag ... ~.. ~. ,i , :
i`;!' . . ' ~ ~' :. `'; , attachment collar 26 is provi~ed ~or attachment of the bag assembly 12 to the housing 10. The collar 26 includes a recessed slot area 30 extending circumferentially about the housing 10.
The bag assembly 12 includes an elastomeric retaining ring 32 having a sealing and retaining bead 34 (FIGURE 2C) for reception in the rscessed slot area 30 whereby the bag assembly 12 is positively sealed during cleaner operation to substantially preclude passing of dus~ particles out of the bag past the retaining ring 32. The re~aining ring 32 includes a lead on flange 36 and a bag assembly attachment flange 38, the bead 34 depending radially inwardly from these flanges and being positioned generally intermediate of the flanges. A
receptacle bag 40 of the bag assembly constructed of a conventionally known cotton twill used for vacuum cleaner bags is ixed to ring 32 at the bag assembly at~achment flange 38 ~-with a high strength thread 42. A bottom wall 46 of the sealing and retaining bead 34 contacts a projection 48 in the :
recess slot area 30 and is slightly deformed about the :
projection by high contact pressure created by the hoop strength of the retaining ring 32. Such a structure provides a very posi~ive seal and eliminates the problems of fine dust particles passing out of the bag assembly 12 during operation o~ the cleaner.
Three pressure surfaces on the bead 34 operate to seal the ring 32 to the collar 26. The bottom wall 46 engaging the projection 48 in the recess slot area 30 produces a high un.t pressure where the projection 48 engages bead 34. It should be noted that the elastomeric ring 32 possesses a hoop strength due to its elastomeric nature and it is sized for a close fit .
~3~2~
over the collar 26. The sealing force of the projection 48 engaging the elas~omeric wall 46 is greater than the air - pressure to leak through the seal and accordingly precludes the leaking of the fine dust particles.
A second pressure surface occurs at the poin~
designated by numeral 50 in ~IGURE 2C at the bead vertical wall engaging the opposed recess slot area vertical wall. This pressure is produced by the back pressure in the bag 40 during operation as a result of the forcing of air in~o the bag 40.
The third pressure poin~ occurs at an area designated by the numeral 52 where the sloping wall of the recessed slot area 30 contacts the front wall 53 of the bead 34 to produce a pressure area which is the resul~ of the natural hoop strength of the elastomeric retaining ring and a preselected interference fit between the ring and the attachment collar.
A pull tab (not shown) is sewn into the retaining ring 32 to facilitate easy separation of the bag assembly 12 from the housing 10. The ring 32 is sized relative to the collar 26 such that the ring is stretched 5-7~ to move the bead 34 into the recessed slot area 30. Such stre~ching produces the hoop strength earlier mentioned. The seal design has been optimized to give proper and improved sealing while allowing ease in at~achment and removal of the bag assembly. The retaining ring 32 is not only decorative but is constructed to minimize the material in the part and yet give proper cross-sectional area to produce a quality seal over repeated stretchingsO
With reference to FIGURES 2 and 3, the hand vacuum housing 10 is preferably constructed of a lightweight plastic.
However, most lightweight plastics which are normally satisfac~ory for such a housing cons~ruction present a problem ,: . .: . ~ . . . .
~ 33~ 2~2 when they are subjected to repeated impingements from the kind of articles which may be sucked in by hand YaCUUm. Such articles comprise small pebbles, coins, screws, nails, etc., which, upon being drawn into the fan chamber 18 are oftentimes propelled against the chamber side walls by the ~an before passing out of the chamber with the working air. The present invention includes a stone shield 60 to block the potentially damaging effects of such propelled objects.
With continued reference to FIGURES 2 and 3, the housing 10 contains a motor 62 having a motor shaft 64 supported in bearing 65 to which a fan 66 is mounted in fan chamber 18. Working air drawn in through nozzle 20 and through fan chamber ingress aperture 68 is expelled from the chamber through channel 70. Intermediate the housing side wall 1~ periphery and the fan 66, the stone shield 60 blocks heavy objects that may be propelled against the housing side walls.
Preferably stone shield 60 is constructed of aluminized cold rolled steel. It is circumferentially spaced from the fan so as no~ to interfere with the fan's rotation and includes a peri'pheral side wall 72 and a front wall 74. The front wall is contiguous to the nozzle 20 and comprises the ingress aperture 68 for the working air. The side wall 72 includes an upper portion tapered away from the front wall 74 to preclude perpendicular impingement of the items against the side wall over that portion. After impingement against the stone shield, objects are communicated out of the fan chamber 18 through the channel 70.
With particular reference ~o FIGURES 2 and 7, the present invention includes an improved structure for mounting the fan 66 to the motor 62. Projecting out from ~he motor ~ 3 ~ 2 mount portion 16 of the housing 10 and into the fan chambers 18 is the motor shaft 64 supported in bearing 65. This shat is driven in rotation by the motor. The shaft 64 includes ~hree portions. A first portion or support shoulder 80 having a generally cylindrical configuration is loosely received in a ...
fan first bore chamber 8Z defined by fan bore lead-on flange 83 and fan counterbore shoulder 85. Depending from the support shoulder portion 80 is a tapering fan bore locking surface 84.
The end portion of the shaft 64 comprises a th~eaded portion 86. It is ta be particularly noted that shaft locking surace 84 is closely received against a tapered wall portion 88 of the fan 66 such that the mating tapers of surface 84 and wall portion 88 can cooperate through engagement to lock the fan 66 to the shaft 64 upon sufficient urging of the fan 66 towards the motor 62. In other words, the mating reception of the shaft taper into the fan bore taper locks the fan to the motor shaft when the fan is sufficiently pressed onto the motor shaft.
. Sufficient urging is realized by threaded reception of : a shaft extension 90 onto the shaft threaded portion 86.
However, the mere fastening of the shaft extension 90 to the shaft by threading it down until the fan is locked to the motor shaft is clearly not sufficient to maintain the fan.in a tightly lscked condition to the shaft when subjected to the relatively intense vibration and high speed rotation of the 'vacuum motor and shaft. Accordingly, an additional force is required to continue ~o tighten the shaft extension 90 onto the shaft por~ion 86 while abutting the fan 66 to maintain the locking reception.
The revolving brush 96 tFIGURES 4 and 6) is rotated by a belt (not shown) received around the brush at an intermediate , ,. . ~, . ~ .... .
.. . . ~ , ~ 33:L262 portion generally immediately below the shaft extension 90.
The belt is received on the shaft extension at generally its point of lessermost diameter 97 (FIG~RE 7). The belt is constructed of an elastomeric material and is stretched over the distance from the brush 96 to the shaft extension 90 to maintain a gripping action on both the shaf~ extension 90 and the brush 96. During operation of the cleaner, a torque is applied by resistance of the belt and brush to motor shaft rotation to the shaft extension 90 to continually tighten down lQ the shaft extension 90 onto the threaded portion 86. The continual tightening of the shaft eXtBnSion 9o during operation continuously urges the shaft extension 90 into abutting engage~ent with the fan 66 to urge the fan towards the mo~or 62 and maintain a tight locking reception o the shaft locking surface 84 against the fan tapered wall portion 88.
Conventional fan fastening techniques such as aerodynamic sealing or in~ernal threading of the fan for reception on a threaded shaft portion is obviated wlth the structure of the present invention. Several advantages of this structure include the lower cost of production of both the motor and the fan. Since there is no necessity to machine or mold a thread on either the fan or motor shaft, manufacturing cost is less. In addition, assembling cost is also less because the fan does not have to be spun on~o the shaft.
Another advantage is that the positive locking connection between the fan and the shaft is effected without putting excessive stress on the fan. Fan internal thread fastening schemes often~imes result in large torque and stress forces being exerted on the threads which possibly distort the fan 3~ during operation. Yet another feature of the present invention ~3~2~2 is that such a fan moun~ing structure absorbs impact loads on the fan better. When a foreign object impinges the fan, the fan has a greater tendency to give against the load than a threaded mounting structure. This allows the fan $o act somewhat as a shock absorber to heavy objects that are drawn into the cleaner.
With reference to ~IGURES 2, 4, 5, and 6, it may be seen that the nozzle portion 20 of the present invention houses the revolving brush 96. The brush 96 includes opposed end bearings 98 which support ~he brush and allow its rotational mov~ment. The nozzle includes integrally formed opposed bearing housing cavities 100 sized to closely receive the bearing housings of the brush. A nozzle guard 102 is fastened to the nozzle por~ion 20 with conventional threaded fasteners tnot shown) inserted into receiving members 104. The nozzle guard has openings through which brush elements 105 extend and through which vaeuumed dirt may pass. The guard 102 further includes bearing housing retaining elements 106 which impart the force to retain the brush 96 in cavities 100. The retaining element 106 is sized such that there is an interference fit against the bearing 98 due to deflection of the clip element 106 which holds the brush solid within the nozzle. The brush 96 is normally unbalanced and will want to vibrate during operation. There is thus a necessity that the brush be positively retained in as close a fit as possible to minimize vibrational movement.
Another feature of the retaining element is that the nozzle guard is preferably constructed of metallic material as is the bearing assembly 98. The retaining element 106 thus can operate as a source of heat transfer. Since the bearing 98 is ;. -., . . : .. ..
~3~2~2 also in contact with the plastic nozzle housing at the cavities 100, heat must be dissipated through the retaining element 106 and ou~ through the sole plate portion of the nozzle guard 102.
The nozzle guard 102 also includes a locating and locking protruding dimple 110 disposed for cooperative association with ~he nozzle whereby the nozzle and nozzle guard are in cooperative support. With particular reference to :
FIGURE 4, the housing 10 is constructed of opposed firs~ and second half housing elements which mate along a center line 112. To buttress the housing, and in particular the nozzle 20 at the center line, dimplè 110 in combina~ion with ~he nozzle guard front wall 114 support the nozzls at its terminal end portion about the center line 112. Such structure minimizes : 15 damage to the cleaner by deflection or separation of the housing half elements at the nozzle terminal end portion.
With particular reference to FIGUR~ 2, it can be seen that the housing 10 includes a motor mount portion 16 for receiving the motor 62 that includes a plurality of air vents 120 provided for communicating the ingress and egress of cooling air to the motor 62. A baffle wall 122 engages the periphery of the motor 62 to define a motor cooling air inhale chamber 124 and an exhalle chamber 126. The motor 62 includes a cooling air fan tnot shown) which draws cooling air in through the vents 120 of the inhale chamber 124 into air vents (not show~) of the motor, through the body of the motor,.out motor vents in the exhale chamber 126 and ultimately out into the environment through the air vents 120 in the exhale chamber 126. The baffle wall 122 precludes cooling air exhausted from the exhale chamber 126 from intermixing with air in the i~lale ~3312~2 chamber 124 without passing through the motor 62. In addition, the ventsi 120 in exhale chamber 126 include a sloped side wall 127 (FIGURE 2D) contiguous to the baffle wall 122 and the vents of the inhale chamber 124. The sloped side wall 127 effectively directs the exhaust air towards the rear of the cleaner and away from the vents of the inhale chamber 124 to inhibit mixing of exhaust cooling air with intake cooling air.
With particular reference to FI~URES 2A and 2B it is important that the cleaner be sealed in a manner that will preclude mixing of cooling air and working air so that the motor 62 is not exposed to vacuumed dirt and yet will provide a strong and durable seal that is easy to assemble. The invention employs a tongue in groove mating fit alo~g the entire periphery of the cleaner between opposing first and second housing halves and about the periphery o the motor mount portion 16.
The housing handle 22, as may be seen from FIGURE lA, further includes besides the tongue in groove sealing, several assembly aid wire grooves 130 for communicating switch wires from the cleaner cord 132 to the cleaner on/off switch 134 (~IGURE 1).
The invention has been described with reference to the preferred embodiment. Obviously, modifications and alterations will occur to others upon the reading and understanding of the ,specification. It is our intention to include all such modifications and alterations insofar as they come wi~hin the l~-scope o~ the appended claims or the equivalents thereof.
Having thus described our invention, we now claim:
,.:,. ~ -: -
i.
:~33~2~2 Yet a:nother problem with hand held vacuum cleaners due to their compactness has been ehe interference of objects drawn in by the working air with th~ Yacuum an a~ter the particl~s hav~ been collected into th~ vacuum bag when they are not inhibited from rolling back ~o the fan after the cleaner has been turn~d off. This is a particular problem in hand held vacuum rleaners where the cleaners ar~ opera~ed in a variety of different positions and si~uations and it is likely or gravitational forces to urge solid objects back towards the nozzle of the cleaner.
The presen~ invention cont~mplates a new and improved hand vacuum cleaner which overcomes all the above referred to problems and others to pro~ide a new hand vacuum which is simple in design, economical to manufacture, compact and lightweight, but provides powerful suction action with a revolving brush, readily adaptable to a plurality of uses in a ~ari~ty o~ cleaning situatio~s, easy to assemble, easy to operate, eas~ to detach, empty and reattach the clean~r bag and which provides improved hand vacuu~ cleaner operation.
~rie~ Sum~ary of the Invention It i~ an a~pect o~ this invention to provid~ ~ hand-held vacuum cleaner including a housing comprising mating ~irst ~nd second hal~ housing e~emen~ aid housing ~aving a handle and a nozzle, a motor having means for drawing coolin~ air through the motor, a selectively-separable bag assembly, a working air channel for co~municating worklng air ~rom said nozzle to said bag as~embly, and a motor mount portion receiving 6aid motor and spaced ~rom said ~orking air channel by a motor mount portion peripheral wall; said motor mount portion . . .
.
--~: -~3~262 including a peripheral motor cooling air intake chamber, a peripheral motor cooling air exhaust chamber and a peripheral baffle wall extending from a housing outer wall to contiguous engagement to said motor, said housing outer wall including a plurality of air inlet vents at said cooling air intake chamber for cooling air inflow to said motor from said intake chamber, and air outlet vents at said cooling air exhaust chamber, for cooling air exhaust from said motor through said exhaust chamber, said inlet and outlet vents being oppositely spaced about said baffle wall, said means for drawing cooling air through the motor causing the cooling air to enter said inlet vents and chamber and exit the outlet chamber and vents; said sealing peripheral wall adjacent said working air channel sealing said intake and exhaust chambers from said channel to preclude cooling air in said cooling air intake and exhaust chambers from mixing with working air in said working air channel.
It is another aspect of this invention to provide a hand-held vacuum cleaner including a housing comprising mating first and second half housing elements, said housing having a handle and a nozzle, a motor having means for drawing cooling air through the motor, a selectively-separable bag assembly, a working air channel for communicating working air from the said nozzle to the said bag assembly, a motor mount portion receiving .25 said motor and spaced from said working air channel by a motor mount portion peripheral wall; said motor mount portion including a peripheral motor cooling air intake chamber, a peripheral motor cooling air exhaust chamber and a peripheral baffle wall extending from a housing outer wall to adjacent said motor, said _ 5 _ ~312~2 : " .
.......
/
, ~ : - 6 -::
~ ~3~ ~X2 housing outer wall including a plurality o~ air inlet vents at said cooling air intake chamber, disposed in at least one of said first and second half housing elements for cooling air inflow to said motor, and air outlet vents at said cooling ~ir exhaust chamber disposed in at least one of said first and second half housing elements for cooling air exhaust ~rom said motor, said inlet and outlet vents being spaced on opposite sides of said baffle wall, said means for drawing cooling air through the motor causing the cooling air to enter said inlet vents and cha~ber and exit the outlet chamber and vents; said motor mount portion peripheral wall adjacent sai~ working air channel sealing said intake and exhaust chambers from said channel to preclude cooling air in said cooling air intake and e~haust chambers from mixing with working air in said working air channel.
Brief D~scription of the Drawin&~
The invention may take physical form in certain parts an~ arra~gements of parts, ~he preferred emb.odimen~ of which will be described in detail in the speciication and illustrated in the accompanying drawings which form a part hereof and whsrein:
FIGU~E 1 is a side eleYational view of a hand vacuum formed in accordance with the present invention;
`' 25 FIGUR~ lA is a cross-sectional view taken along line l~-lA o FIGURE 1 particularly illustrating asse~bly aid wire grooves in the Yacuum handle;
FIGURE 2 is an enlarged cross-sectional view of the hand vacuum housing;
2 ~ 2 ~IGURE 2A is an enlarged sectional view of FIGURE 2 particularly illustrating the tongue in groove assembly of the housing;
PIGURE 2B is a cross-sectional view taken along line 2B-2B of ~IGURE 2A;
FIGURE 2C is an enlarged sectional view of FIGURE 2 particularly showing the elastomeric retaining ring of the bag assembly as it is received on the hand vacuum housing;
FIGURE 2D is an enlarged sectional view of FIGURE 2 taken along lines 2D-2D particularly showing an air vent slot construction;
FIGURE 3 is a cross-sectional view taken along line 3-3 of FIGURE 2;
FIGURE 4 is an enlarged front elevational view with partial cutaways in section of the present invention;
FIGURE 5 is a cross-sectional view taken along line 5-5 of FIGURE 4;
FIGURE 6 is a cross--sectional view taken along line 6-6 of FIGURE 4; and FIGURE 7 is an enlarged elevational view in partial section of the motor and fan assembly.
Detailed Description of the Invention ~eferring now to the drawings wherein the showings are . 20r purposes of illus~rating the preferred embodiment of the invention only`and not for purposes of limiting same, the FIGURES show a hand vacuum device comprised of a housing 10 and selectively separable bag assembly 12.
More specifically, and with reference to FIGURES 1 and . 2, the vacuum housing 10 includes a motor mount portion 163 a fan chamber 18, a nozzle 20 and a handle 22. An annular bag ... ~.. ~. ,i , :
i`;!' . . ' ~ ~' :. `'; , attachment collar 26 is provi~ed ~or attachment of the bag assembly 12 to the housing 10. The collar 26 includes a recessed slot area 30 extending circumferentially about the housing 10.
The bag assembly 12 includes an elastomeric retaining ring 32 having a sealing and retaining bead 34 (FIGURE 2C) for reception in the rscessed slot area 30 whereby the bag assembly 12 is positively sealed during cleaner operation to substantially preclude passing of dus~ particles out of the bag past the retaining ring 32. The re~aining ring 32 includes a lead on flange 36 and a bag assembly attachment flange 38, the bead 34 depending radially inwardly from these flanges and being positioned generally intermediate of the flanges. A
receptacle bag 40 of the bag assembly constructed of a conventionally known cotton twill used for vacuum cleaner bags is ixed to ring 32 at the bag assembly at~achment flange 38 ~-with a high strength thread 42. A bottom wall 46 of the sealing and retaining bead 34 contacts a projection 48 in the :
recess slot area 30 and is slightly deformed about the :
projection by high contact pressure created by the hoop strength of the retaining ring 32. Such a structure provides a very posi~ive seal and eliminates the problems of fine dust particles passing out of the bag assembly 12 during operation o~ the cleaner.
Three pressure surfaces on the bead 34 operate to seal the ring 32 to the collar 26. The bottom wall 46 engaging the projection 48 in the recess slot area 30 produces a high un.t pressure where the projection 48 engages bead 34. It should be noted that the elastomeric ring 32 possesses a hoop strength due to its elastomeric nature and it is sized for a close fit .
~3~2~
over the collar 26. The sealing force of the projection 48 engaging the elas~omeric wall 46 is greater than the air - pressure to leak through the seal and accordingly precludes the leaking of the fine dust particles.
A second pressure surface occurs at the poin~
designated by numeral 50 in ~IGURE 2C at the bead vertical wall engaging the opposed recess slot area vertical wall. This pressure is produced by the back pressure in the bag 40 during operation as a result of the forcing of air in~o the bag 40.
The third pressure poin~ occurs at an area designated by the numeral 52 where the sloping wall of the recessed slot area 30 contacts the front wall 53 of the bead 34 to produce a pressure area which is the resul~ of the natural hoop strength of the elastomeric retaining ring and a preselected interference fit between the ring and the attachment collar.
A pull tab (not shown) is sewn into the retaining ring 32 to facilitate easy separation of the bag assembly 12 from the housing 10. The ring 32 is sized relative to the collar 26 such that the ring is stretched 5-7~ to move the bead 34 into the recessed slot area 30. Such stre~ching produces the hoop strength earlier mentioned. The seal design has been optimized to give proper and improved sealing while allowing ease in at~achment and removal of the bag assembly. The retaining ring 32 is not only decorative but is constructed to minimize the material in the part and yet give proper cross-sectional area to produce a quality seal over repeated stretchingsO
With reference to FIGURES 2 and 3, the hand vacuum housing 10 is preferably constructed of a lightweight plastic.
However, most lightweight plastics which are normally satisfac~ory for such a housing cons~ruction present a problem ,: . .: . ~ . . . .
~ 33~ 2~2 when they are subjected to repeated impingements from the kind of articles which may be sucked in by hand YaCUUm. Such articles comprise small pebbles, coins, screws, nails, etc., which, upon being drawn into the fan chamber 18 are oftentimes propelled against the chamber side walls by the ~an before passing out of the chamber with the working air. The present invention includes a stone shield 60 to block the potentially damaging effects of such propelled objects.
With continued reference to FIGURES 2 and 3, the housing 10 contains a motor 62 having a motor shaft 64 supported in bearing 65 to which a fan 66 is mounted in fan chamber 18. Working air drawn in through nozzle 20 and through fan chamber ingress aperture 68 is expelled from the chamber through channel 70. Intermediate the housing side wall 1~ periphery and the fan 66, the stone shield 60 blocks heavy objects that may be propelled against the housing side walls.
Preferably stone shield 60 is constructed of aluminized cold rolled steel. It is circumferentially spaced from the fan so as no~ to interfere with the fan's rotation and includes a peri'pheral side wall 72 and a front wall 74. The front wall is contiguous to the nozzle 20 and comprises the ingress aperture 68 for the working air. The side wall 72 includes an upper portion tapered away from the front wall 74 to preclude perpendicular impingement of the items against the side wall over that portion. After impingement against the stone shield, objects are communicated out of the fan chamber 18 through the channel 70.
With particular reference ~o FIGURES 2 and 7, the present invention includes an improved structure for mounting the fan 66 to the motor 62. Projecting out from ~he motor ~ 3 ~ 2 mount portion 16 of the housing 10 and into the fan chambers 18 is the motor shaft 64 supported in bearing 65. This shat is driven in rotation by the motor. The shaft 64 includes ~hree portions. A first portion or support shoulder 80 having a generally cylindrical configuration is loosely received in a ...
fan first bore chamber 8Z defined by fan bore lead-on flange 83 and fan counterbore shoulder 85. Depending from the support shoulder portion 80 is a tapering fan bore locking surface 84.
The end portion of the shaft 64 comprises a th~eaded portion 86. It is ta be particularly noted that shaft locking surace 84 is closely received against a tapered wall portion 88 of the fan 66 such that the mating tapers of surface 84 and wall portion 88 can cooperate through engagement to lock the fan 66 to the shaft 64 upon sufficient urging of the fan 66 towards the motor 62. In other words, the mating reception of the shaft taper into the fan bore taper locks the fan to the motor shaft when the fan is sufficiently pressed onto the motor shaft.
. Sufficient urging is realized by threaded reception of : a shaft extension 90 onto the shaft threaded portion 86.
However, the mere fastening of the shaft extension 90 to the shaft by threading it down until the fan is locked to the motor shaft is clearly not sufficient to maintain the fan.in a tightly lscked condition to the shaft when subjected to the relatively intense vibration and high speed rotation of the 'vacuum motor and shaft. Accordingly, an additional force is required to continue ~o tighten the shaft extension 90 onto the shaft por~ion 86 while abutting the fan 66 to maintain the locking reception.
The revolving brush 96 tFIGURES 4 and 6) is rotated by a belt (not shown) received around the brush at an intermediate , ,. . ~, . ~ .... .
.. . . ~ , ~ 33:L262 portion generally immediately below the shaft extension 90.
The belt is received on the shaft extension at generally its point of lessermost diameter 97 (FIG~RE 7). The belt is constructed of an elastomeric material and is stretched over the distance from the brush 96 to the shaft extension 90 to maintain a gripping action on both the shaf~ extension 90 and the brush 96. During operation of the cleaner, a torque is applied by resistance of the belt and brush to motor shaft rotation to the shaft extension 90 to continually tighten down lQ the shaft extension 90 onto the threaded portion 86. The continual tightening of the shaft eXtBnSion 9o during operation continuously urges the shaft extension 90 into abutting engage~ent with the fan 66 to urge the fan towards the mo~or 62 and maintain a tight locking reception o the shaft locking surface 84 against the fan tapered wall portion 88.
Conventional fan fastening techniques such as aerodynamic sealing or in~ernal threading of the fan for reception on a threaded shaft portion is obviated wlth the structure of the present invention. Several advantages of this structure include the lower cost of production of both the motor and the fan. Since there is no necessity to machine or mold a thread on either the fan or motor shaft, manufacturing cost is less. In addition, assembling cost is also less because the fan does not have to be spun on~o the shaft.
Another advantage is that the positive locking connection between the fan and the shaft is effected without putting excessive stress on the fan. Fan internal thread fastening schemes often~imes result in large torque and stress forces being exerted on the threads which possibly distort the fan 3~ during operation. Yet another feature of the present invention ~3~2~2 is that such a fan moun~ing structure absorbs impact loads on the fan better. When a foreign object impinges the fan, the fan has a greater tendency to give against the load than a threaded mounting structure. This allows the fan $o act somewhat as a shock absorber to heavy objects that are drawn into the cleaner.
With reference to ~IGURES 2, 4, 5, and 6, it may be seen that the nozzle portion 20 of the present invention houses the revolving brush 96. The brush 96 includes opposed end bearings 98 which support ~he brush and allow its rotational mov~ment. The nozzle includes integrally formed opposed bearing housing cavities 100 sized to closely receive the bearing housings of the brush. A nozzle guard 102 is fastened to the nozzle por~ion 20 with conventional threaded fasteners tnot shown) inserted into receiving members 104. The nozzle guard has openings through which brush elements 105 extend and through which vaeuumed dirt may pass. The guard 102 further includes bearing housing retaining elements 106 which impart the force to retain the brush 96 in cavities 100. The retaining element 106 is sized such that there is an interference fit against the bearing 98 due to deflection of the clip element 106 which holds the brush solid within the nozzle. The brush 96 is normally unbalanced and will want to vibrate during operation. There is thus a necessity that the brush be positively retained in as close a fit as possible to minimize vibrational movement.
Another feature of the retaining element is that the nozzle guard is preferably constructed of metallic material as is the bearing assembly 98. The retaining element 106 thus can operate as a source of heat transfer. Since the bearing 98 is ;. -., . . : .. ..
~3~2~2 also in contact with the plastic nozzle housing at the cavities 100, heat must be dissipated through the retaining element 106 and ou~ through the sole plate portion of the nozzle guard 102.
The nozzle guard 102 also includes a locating and locking protruding dimple 110 disposed for cooperative association with ~he nozzle whereby the nozzle and nozzle guard are in cooperative support. With particular reference to :
FIGURE 4, the housing 10 is constructed of opposed firs~ and second half housing elements which mate along a center line 112. To buttress the housing, and in particular the nozzle 20 at the center line, dimplè 110 in combina~ion with ~he nozzle guard front wall 114 support the nozzls at its terminal end portion about the center line 112. Such structure minimizes : 15 damage to the cleaner by deflection or separation of the housing half elements at the nozzle terminal end portion.
With particular reference to FIGUR~ 2, it can be seen that the housing 10 includes a motor mount portion 16 for receiving the motor 62 that includes a plurality of air vents 120 provided for communicating the ingress and egress of cooling air to the motor 62. A baffle wall 122 engages the periphery of the motor 62 to define a motor cooling air inhale chamber 124 and an exhalle chamber 126. The motor 62 includes a cooling air fan tnot shown) which draws cooling air in through the vents 120 of the inhale chamber 124 into air vents (not show~) of the motor, through the body of the motor,.out motor vents in the exhale chamber 126 and ultimately out into the environment through the air vents 120 in the exhale chamber 126. The baffle wall 122 precludes cooling air exhausted from the exhale chamber 126 from intermixing with air in the i~lale ~3312~2 chamber 124 without passing through the motor 62. In addition, the ventsi 120 in exhale chamber 126 include a sloped side wall 127 (FIGURE 2D) contiguous to the baffle wall 122 and the vents of the inhale chamber 124. The sloped side wall 127 effectively directs the exhaust air towards the rear of the cleaner and away from the vents of the inhale chamber 124 to inhibit mixing of exhaust cooling air with intake cooling air.
With particular reference to FI~URES 2A and 2B it is important that the cleaner be sealed in a manner that will preclude mixing of cooling air and working air so that the motor 62 is not exposed to vacuumed dirt and yet will provide a strong and durable seal that is easy to assemble. The invention employs a tongue in groove mating fit alo~g the entire periphery of the cleaner between opposing first and second housing halves and about the periphery o the motor mount portion 16.
The housing handle 22, as may be seen from FIGURE lA, further includes besides the tongue in groove sealing, several assembly aid wire grooves 130 for communicating switch wires from the cleaner cord 132 to the cleaner on/off switch 134 (~IGURE 1).
The invention has been described with reference to the preferred embodiment. Obviously, modifications and alterations will occur to others upon the reading and understanding of the ,specification. It is our intention to include all such modifications and alterations insofar as they come wi~hin the l~-scope o~ the appended claims or the equivalents thereof.
Having thus described our invention, we now claim:
,.:,. ~ -: -
Claims (4)
1. A hand-held vacuum cleaner including a housing comprising mating first and second half housing elements, said housing having a handle and a nozzle, a motor having means for drawing cooling air through the motor, a selectively-separable bag assembly, a working air channel for communicating working air from said nozzle to said bag assembly, and a motor mount portion receiving said motor and spaced from said working air channel by a motor mount portion peripheral wall; said motor mount portion including a peripheral motor cooling air intake chamber, a peripheral motor cooling air exhaust chamber and a peripheral baffle wall extending from a housing outer wall to contiguous engagement to said motor, said housing outer wall including a plurality of air inlet vents at said cooling air intake chamber for cooling air inflow to said motor from said intake chamber, and air outlet vents at said cooling air exhaust chamber, for cooling air exhaust from said motor through said exhaust chamber, said inlet and outlet vents being oppositely spaced about said baffle wall, said means for drawing cooling air through the motor causing the cooling air to enter said inlet vents and chamber and exit the outlet chamber and vents; said sealing peripheral wall adjacent said working air channel sealing said intake and exhaust chambers from said channel to preclude cooling air in said cooling air intake and exhaust chambers from mixing with working air in said working air channel.
2. The cleaner as claimed in claim 1 wherein said housing includes an air deflector substantially received in said bag assembly having a terminal end portion tapering radially inwardly past said working air channel from said housing outer wall whereby said deflector directs the working air to facilitate greater storage of vacuumed dirt in the bag and prevents heavy objects received in the bag from rolling back into the housing and contacting the fan.
3. A hand-held vacuum cleaner including a housing comprising mating first and second half housing elements, said housing having a handle and a nozzle, a motor having means for drawing cooling air through the motor, a selectively-separable bag assembly, a working air channel for communicating working air from the said nozzle to the said bag assembly, a motor mount portion receiving said motor and spaced from said working air channel by a motor mount portion peripheral wall; said motor mount portion including a peripheral motor cooling air intake chamber, a peripheral motor cooling air exhaust chamber and a peripheral baffle wall extending from a housing outer wall to adjacent said motor, said housing outer wall including a plurality of air inlet vents at said cooling air intake chamber, disposed in at least one of said first and second half housing elements for cooling air inflow to said motor, and air outlet vents at said cooling air exhaust chamber disposed in at least one of said first and second half housing elements for cooling air exhaust from said motor, said inlet and outlet vents being spaced on opposite sides of said baffle wall, said means for drawing cooling air through the motor causing the cooling air to enter said inlet vents and chamber and exit the outlet chamber and vents; said motor mount portion peripheral wall adjacent said working air channel sealing said intake and exhaust chambers from said channel to preclude cooling air in said cooling air intake and exhaust chambers from mixing with working air in said working air channel.
4. The cleaner as claimed in claim 3 wherein said housing includes an air deflector substantially received in said bag assembly having a terminal end portion tapering radially inwardly past said working air channel from said housing outer wall whereby said deflector directs the working air to facilitate greater storage of vacuumed dirt in the bag and prevents heavy objects received in the bag from rolling back into the housing and contacting the fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000615685A CA1331262C (en) | 1984-11-09 | 1990-03-30 | Hand vacuum cleaner |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US670,553 | 1984-11-09 | ||
| US06/670,553 US4633543A (en) | 1984-11-09 | 1984-11-09 | Hand vacuum cleaner |
| CA000541857A CA1291602C (en) | 1984-11-09 | 1987-07-10 | Hand vacuum cleaner |
| CA000615685A CA1331262C (en) | 1984-11-09 | 1990-03-30 | Hand vacuum cleaner |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000541857A Division CA1291602C (en) | 1984-11-09 | 1987-07-10 | Hand vacuum cleaner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1331262C true CA1331262C (en) | 1994-08-09 |
Family
ID=25671415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000615685A Expired - Fee Related CA1331262C (en) | 1984-11-09 | 1990-03-30 | Hand vacuum cleaner |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1331262C (en) |
-
1990
- 1990-03-30 CA CA000615685A patent/CA1331262C/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |