U.S. patent number 3,667,084 [Application Number 05/083,300] was granted by the patent office on 1972-06-06 for lightweight vacuum cleaner.
This patent grant is currently assigned to Dynamics Corporation of America. Invention is credited to Robert J. Emmons, Maurice P. Samuelian, Bruno M. Valbona.
United States Patent |
3,667,084 |
Valbona , et al. |
June 6, 1972 |
LIGHTWEIGHT VACUUM CLEANER
Abstract
A portable lightweight vacuum cleaner having an extendable
nozzle intake conduit rigidly supported by an easily adjustable
resilient seal losing the lower end of a filter bag compartment
into which the intake conduit projects to vary the distance between
a fixed operating handle and the nozzle without changing the
manageability and nozzle-floor orientation with users of different
statures.
Inventors: |
Valbona; Bruno M. (Avon,
CT), Emmons; Robert J. (Manchester, CT), Samuelian;
Maurice P. (West Hartford, CT) |
Assignee: |
Dynamics Corporation of America
(New York, NY)
|
Family
ID: |
26769146 |
Appl.
No.: |
05/083,300 |
Filed: |
October 23, 1970 |
Current U.S.
Class: |
15/323; 15/329;
15/339; 15/350; 15/368; 15/410; 15/412; 15/414; 55/DIG.3 |
Current CPC
Class: |
A47L
5/24 (20130101); A47L 9/19 (20130101); A47L
9/06 (20130101); A47L 9/0653 (20130101); Y10S
55/03 (20130101) |
Current International
Class: |
A47L
5/24 (20060101); A47L 5/22 (20060101); A47L
9/10 (20060101); A47L 9/06 (20060101); A47L
9/19 (20060101); A47l 009/00 () |
Field of
Search: |
;15/339,350,323 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Scheel; Walter A.
Assistant Examiner: Moore; C. K.
Claims
What is claimed is:
1. In a lightweight vacuum cleaner the combination of a portable
housing having a filter bag compartment subjected to subatmospheric
pressures,
a guide conduit means extending into said compartment at its lower
end,
a member defining an end wall for the compartment around said
conduit,
sealing member carried by said wall on the compartment side
thereof,
a porous walled filter bag received in said compartment with its
open end disposed in sealing engagement against the sealing member
around said conduit,
an intake nozzle supporting tube slidably received in said conduit
means to extend into said filter bag an adjustable distance,
means interconnecting said conduit and tube for sealing and holding
said tube at any one of a number of different distances of
extension from said conduit.
2. The combination called for in claim 1 including an electric
motor driven blower means in sealed communication with said
compartment outside of said filter bag to withdraw air from said
compartment, and
exhaust means for conducting withdrawn air through the electrical
motor.
3. The combination called for in claim 2 including an extension
cord, and
a grating covering an air exhaust opening in said housing and
having parallel grille elements at least two of which are spaced a
distance adequate to receive loops of said extension cord
therebetween with a slight squeezing action in supporting
relationship.
4. The combination called for in claim 3 in which said grating
vents in one direction longitudinally of said housing, and
a projection on said housing remote from said grating and extending
in the opposite direction therefrom to provide a cleating action
for the extension cord in combination with said grating.
5. In a vacuum cleaner housing having a filter bag compartment
subjected to subatmospheric pressures, the combination of
a guide conduit means extending into said compartment at its lower
end,
a member defining an end wall for the compartment around said
conduit,
a sealing member carried by said wall,
a porous walled filter bag received in said compartment with its
open end disposed in sealing engagement against the sealing member
around said conduit,
an intake nozzle having an intake opening defining a working
plane,
a tube disposed at an acute angle to said plane for supporting said
nozzle and slidably received in said conduit to extend into said
filter bag an adjustable distance,
means interconnecting said conduit and tube including a resilient
member sealing and holding said tube at any one of a number of
different distances of extension from said conduit.
6. The combination called for in claim 5 in which the nozzle is
supported in its working position with the tube disposed at
approximately 45.degree. from the vertical, and
handle means elongated to provide a helve at the upper end of the
housing disposed at an angle of approximately 20.degree. to the
horizontal and terminally bordered by shoulders engaged by a user's
fingers crooked around the helve.
7. The combination called for in claim 6 including
a carrying handle located on said housing approximately above the
center of gravity thereof for carrying the cleaner and for two
handed manipulation of the cleaner to sweep other than horizontally
disposed objects,
said tube being adjustable an extendable distance from the housing
in combination with said handle means for greater cleaning reach of
said nozzle in two handed operation of the cleaner.
8. The combination defined in claim 5 in which said tube has
indicia on it oriented to said interconnecting means indicating the
adjusted position of the tube in relation to the geometric location
of the upper end of the cleaner with respect to the height of the
user.
9. The combination called for in claim 8 in which said indicia
represents the heights of users and are spaced on the tube in
increments proportioned to approximately one-half the heights of
the users as based upon the square root of one-half the square of
the distance from the nozzle to the handle.
10. The combination defined in claim 5 including a manually engaged
handle means located at the upper end of the housing and
cooperating indicia on said tube and interconnecting means oriented
with respect to said interconnecting means to indicate the adjusted
position of the tube with respect to the working height of the
handle with respect to the stature of the user and the height of
said handle.
11. The combination called for in claim 10 in which said tube is of
plastic and has indicia in the outer wall thereof spaced a distance
different from the distance between said indicia on said
interconnecting means and said resilient member.
12. In a lightweight vacuum cleaner
a plastic housing having a filter bag compartment subjected to sub
atmospheric pressures, the combination of
plastic guide conduit means externally threaded around a gland
receiving enlargement at its outer end and extending into said
compartment at its inner end,
a member defining an end wall for the compartment around said
inward extension of the conduit,
a sponge sealing member supported by said wall,
a porous stiff walled filter bag means removably secured in said
compartment with its open end disposed in sealing engagement
against the sealing member around said conduit means,
a plastic intake nozzle,
a plastic tube slidably received in said conduit to extend into
said filter bag an adjustable distance,
resilient gland means in said enlargement interengaging said
conduit and tube manually actuated gland nut means engaging said
external thread to compress said resilient gland means for sealing
and holding said tube in any one of a number of different distances
of extension from said conduit.
13. The combination called for in claim 12 in which said tube is
appreciably curved at its lower end and said nozzle is swivelly
mounted on said tube at its lower end for relative rotation in a
plane disposed at an acute angle to the tube,
said tube being rotatively and extendably adjustable for two handed
operation of the cleaner.
Description
CROSS-REFERENCES TO RELATED CASES
Assigned to the assignee of the present application, Valbona et
al., filed of even date Oct. 23, 1970, Ser. No. 83,504 for Vacuum
Cleaner.
CONSIDERATION OF INVENTION
The usefulness and effectiveness of a hand propelled lightweight
vacuum cleaner is reflected in its ability to reach remote areas as
under furniture, and its short silhouette for packaging and
storability in small spaces. Furthermore, its all around
adaptability to the comfort and stature of a user and long periods
of use without tiring are of importance, it being desirable that
throughout its major use the nozzle is maintained at a
predetermined angle to the floor and that this result be
accomplished somewhat automatically and comfortably by the distance
of the nozzle to the handle being adjusted so that the handle is
close to the natural level of the hand of the user to maintain said
predetermined nozzle angle as a natural concomitant of the use of
the cleaner. This angle is preferably approximately 45.degree. to
compromise vectors of forces involved in pushing and pulling the
nozzle across a carpet in conjunction with manually supporting the
upper end of the sweeper so that the body weight of the cleaner
maintains an adequate but light and constant pressure of the nozzle
against the carpet. This is related also to the natural action of
the user pushing with the handle lowered slightly and pulling with
the handle raised slightly to rock the nozzle with respect to a
natural intermediate supported position.
Moreover, by way of easing the manual effort of holding and
manipulating the sweeper and the nozzle, particularly by relaxing
the conventional tightness of manually gripping the handle, the
handle is curved substantially 25.degree. toward the horizontal and
comprises a substantially wide width helve over an oval opening
through which the fingers of the user can be crooked to propel the
sweeper in either direction without need for gripping the helve
portion of the handle. The crooked fingers merely engage the
shoulders defined by closed ends of the opening.
The housing is provided with a carrying handle located forwardly of
the helved handle for several purposes including bimanual
manipulation of the sweeper and for the manipulation of two
separable housing parts, namely the lower housing and latch
assembly, and for holding the lower housing while replacing or
cleaning the filter bag therein.
Other and further structural characteristics and objects will
appear from the ensuing description of a preferred construction
that is lightweight, well balanced and adaptable for easy handling.
It is economical to make, use and service, as well as readily
packaged or stored in minimal space.
IN THE DRAWINGS
FIG. 1 is a perspective view, partially from the rear showing a
preferred embodiment of the invention;
FIG. 2 is a side elevational view, partly cut away, of the
embodiment in FIG. 1 showing its normal working orientation angle
with respect to a floor and its length that is adjustable for
persons of different heights;
FIGS. 3 and 4 are sectional views taken on lines 3--3 and 4--4,
respectively, in FIG. 2;
FIG. 5 is an elevational view of the lower end of the lower housing
partially cut away indicating the structural relationship of the
intake tube and the filter bag mounting;
FIG. 6 is an elevational view of the upper housing secured to the
upper end of the lower housing and partially cut away to show the
blower and its relationship to the upper end of the filter bag and
its cooling arrangement and electrical controls;
FIG. 7 is a sectional view taken on line 7--7 of FIG. 6; and
FIG. 8 is a partially sectional view showing the mounting of the
blower and the circulation of the motor cooling air.
THE PREFERRED EMBODIMENT
Referring now to FIGS. 1 and 2, the lightweight cleaner 10
embodying the invention comprises a lower housing 12
compartmentized at 13 as a tank to receive loosely therein a rather
stiff walled porous filter bag 14. The filter bag is mounted on a
holder 11 and inserted to its working position through a full size
opening 15 at the upper end of the housing with its open end 17
disposed downwardly, and the upper end of an intake tube 25 is
received through a guide conduit 16 provided in the lower end of
the housing 12 to extend upwardly into the open lower end 17 of the
filter bag. Both the lower end of bag and the upper end of the tube
are supported in place by the guide conduit 16 and a metal cross
plate 18 (FIG.5).
The bag holder 11 comprises a ring 21 and a U-shaped bail 9 secured
thereto for handling. The filter bag is inserted through the ring
21 until it touches the bight at 27 of the bail. Then the edges of
the bag are folded as at 19 externally back and around the ring 21.
Thereupon, the assembled bag and holder are slid into the housing
open end first. Drop out of the bag is accomplished by turning the
housing with the nozzle end up. A urethane foam pad 23 interengages
the conduit 16 and the open folded end of the filter bag in sealing
relationship.
The guide conduit 16 preferably extends as at 34 beyond the lower
end of the housing 12 where it is threaded with a heavy thread 31
and has an internal square shoulder 32 at the inner end of a
terminal enlargement 29 receiving a gland seal 28.
The intake conduit 16 slidably receives the tube 25 which
terminally carries a nozzle 20 by a connection 22 that permits a
lateral swivelling of the nozzle, and, as indicated by broken lines
24 (FIG. 2), the tube is adjustable as to its exposed length by
means of a gland nut 26 axially compressing the resilient gland
seal 28 (FIG. 4) to expand it radially against the tube. The seal
28 is disposed between two anti-friction metal washers 30 resting
against oppositely facing shoulders. Shoulder 33 is on the gland
nut 26 and the shoulder 32 is at the inner end of the enlargement
29 within the threaded housing extension tube guide 34.
An upper housing 36, as also shown in FIG. 6, mates at its lower
end with the contour of the upper end of the lower housing where it
is held in alignment therewith by toggle latches 38 to close the
upper end of the compartment 13 and hold the bag 14 in place by
means of a removable partition 40 having an outlet opening 42
therein covered by a fine wire screen 43. The air is withdrawn from
the filter bag compartment 13 through the wire screen 43 by a
centrifugal blower (FIG. 8). The blower comprises an air impeller
44 having radial blades 45 disposed on a supporting plate 47 on the
side of the opening 43 so that the partition 40 serves as a shroud
for the blades and redirects the exhaust axially as indicated by
the arrows in FIG. 6. The impeller is mounted on the motor shaft 46
by a nut and lock nut assembly 48 as driven by a motor 50 having a
rotor and stator. These motor parts are disposed in a housing 52
having bearing support spiders 51 at opposite ends which establish
a path for the flow of air through these parts.
The blower and motor are mounted in operative position on an
impervious baffle partition 54 (FIG. 6) which compels air exhausted
by the blower from the filter bag compartment to flow peripherally
through the exhaust area 53 and then through the support spiders 51
and through the cooperating armature and stator elements to cool
them before being expelled through the grating 56 at the upper end
of the upper housing.
The grating 56 is shaped to provide parallel grill elements 55
spaced a distance adequate to receive loops 57 of an electrical
extension cord 59 therebetween with a slight squeezing action to
hold the loops in place either with or without the cooperation of
the projection 61 at the other end of the housing providing a
cleating action. The cord 59 can be wound circularly as shown in
FIG. 1 or wound in a figure 8 (not shown) to avoid any twist
tangling of the cord.
Extending beyond the upper housing is a handle section 60 secured
thereto by assembly screws 62. The handle can be made in matching
halves, but preferably, as shown, one portion is made as a base
portion 63 that is deeply recessed and open to receive the wiring
and wire nuts that connect a main switch 64, a surge switch 66 and
a warning light 68 in circuit with the motor as more particularly
described in said Valbona et al. application, reference to which is
hereby made. It is sufficient to mention at this time that the main
switch 64 provides two regular speeds HI and LO while the surge
switch 66 must be hand held to override the main switch to provide
a higher or surge speed for momentary operation.
A thermostat 70, in heat exchange contact with the stator core 67
of the motor, is responsive to the temperature of the motor and
closes to warn of a high temperature by energizing the red warning
light 68 to indicate that the bag should be emptied because not
enough air is getting through the filter bag to adequately cool the
motor. Thus, the warning light 68 indicates when the motor becomes
too warm and also that the filter bag requires emptying for
efficient vacuuming operation.
The switch 64 is preferably a three position switch for OFF, LO,
and HI operation while the switch 66 preferably is a spring
returned push button or slide switch which requires sustained
manual operation to remain ON. The switch 66 is located at the top
of the handle section 60 where it is remote enough to require some
hand effort to hold it ON with little likelihood that it will be
held on throughout continuous manual operation of the cleaner, but
rather only when a particular vacuuming pick-up difficulty is
presented.
Once the electrical switch and light components are conventionally
mounted and the wiring is located in place, a cover plate 69 is
secured in place to the base member 63 with the extension cord
strain relief element 65 disposed as shown in FIG. 1.
As already mentioned in the objects, the handle is shaped for
particular usefulness in coaction with the adjustable distance
between the nozzle and the handle with respect to the floor 71
(FIG. 2), as held by users of different statures at an angle to the
floor of substantially 45.degree.. The handle is formed and
inclined away from this angle of 45.degree. approximately
25.degree. thereto. This relationship is maintained throughout all
adjustments as to height so that any one of a great majority of
users, when standing, need only manipulate the sweeper at a level
which is the natural position of the hand at the user's side.
To assure optimum comfort of hand position and sweeper operation,
the helve portion 72 is provided with rounded ends or shoulders 74
for the crooking of the user's fingers therebetween. Then the
fingers engage one or the other shoulder for push and pull
movements without need for gripping the helve anymore than to
retain it in the crooked fingers. Thus the wrist of the user is not
strained as when a tight grip of a conventional sweeper handle is
required of the user. Even with the present invention such a
habitual tight grip is relieved of strain so much that the user
gradually relaxes in comfort with the ease of operation. It is
preferred to connect the lower ends of the shoulders 74 to prevent
them catching on articles. Moreover, the ultimate appearance is
also improved as well as the avoidance of sharp corners and
edges.
As shown in FIGS. 1 and 2 a second or carrying handle 76 for the
cleaner is located on the lower housing 12. It is of a length and
so located that a person can pick up the cleaner 10 above its
center of gravity for carrying, or both handles 60 and 76 can be
used by both hands of the user to sweep other than horizontally
disposed objects.
The construction of the nozzle 20 also adds to the ease and user
comfort of operation when rocking the nozzle by lowering the handle
while pushing it and raising the handle while pulling it under
certain sweeping conditions. The level of the brush is controlled
by a foot operated cam that centrally raises and lowers it in
vertical tracks 77 at the ends of the nozzle as urged downward by
compression springs 79 for resilient engagement of the brush with a
work surface under the weight of the cleaner. This brush can be
raised by the cam 73 being moved longitudinally to raise the brush
so that its lower edge is at or above the level of the edges of the
mouth of the nozzle. The cam can be foot or finger operated by
buttons 80 on carrier arms 82 secured to the cam. Furthermore,
three spaced oval shaped rollers 81 (FIG. 1) are journalled within
the mouth of the nozzle to extend a short distance therebelow to
carry the weight of the sweeper on hard flooring.
It will be further appreciated that various cleaning attachments
can be provided for the sweeper and used interchangeably with the
nozzle carrying tube 25 including a flexible hose merely by
loosening the gland nut 26, removing the tube 25, inserting a like
tube carrying another cleaning attachment, and retightening the
gland nut. If there is any substantial length provided for the
tube, the tube can be adjusted as to its exposed length the same
way as already described since the tube is of uniform size
throughout and the tube can have measuring indicia on it if the
adjusted exposed length of the tube is critical beyond the desires
of the user. In fact, to assist users in readily adjusting the
nozzle carrying tube 25 to their statures, personalizing height
marks 85 are provided on the tube 25 every 1.50 inches
approximately, and can be related to every 2 inches of stature
height within a general range of user statures which will provide
approximately the proper handle height for the level of the user's
hand which is one-half the stature height. The range accommodated
thereby is quite wide because the marked tube 25 has clearance in
the filter bag to telescope more than one foot and this provides a
stature range that is over 16 inches. These marks and the gland nut
position are so arranged that when one of the marks is at the front
edge of the gland nut, as shown in FIG. 4, the adjacent higher mark
is not located at the seal 28. Accordingly, the marks can be
recessed into the external surface of the tube without any
possibility of air leaking past the seal. Otherwise, the tube 25,
preferably being made of plastic, can have the recesses filled with
a plastic filler of a contrasting color. The number and arrangement
of the marks are then design free of possible physical
requirements.
The nozzle, 20, the housings 12 and 36, the gland nut 26, and the
tube 25 are preferably for lightness, strength and durability made
of a plastic taken from the following group of plastics:
polyester resins;
rigid vinyls;
styrene polymers;
acrylics;
polyvinyl chlorides;
acrylic-PVC alloys; and
A B S resins such as:
styrene-acrylonitrile-
butadiene tetrapolymers.
Having thus described the preferred embodiments with explanation of
the concepts involved, it will be understood how various and
further embodiments can be made without departing from the spirit
of the invention.
* * * * *