U.S. patent application number 12/127303 was filed with the patent office on 2009-04-23 for vacuum cleaner nozzle with disposable cover sheet.
Invention is credited to Carl M. Barr, Ian Emil Sohn.
Application Number | 20090100636 12/127303 |
Document ID | / |
Family ID | 40377309 |
Filed Date | 2009-04-23 |
United States Patent
Application |
20090100636 |
Kind Code |
A1 |
Sohn; Ian Emil ; et
al. |
April 23, 2009 |
Vacuum Cleaner Nozzle with Disposable Cover Sheet
Abstract
A vacuum cleaner base includes a source of suction and front
wheels and rear wheels for wheeling the base across a floor. A
nozzle assembly is attached to and supported by the base. The
nozzle assembly includes a suction inlet and a sheet-pressing
surface that are located in front of the front wheels. A disposable
sheet is configured to be removably attached to the nozzle assembly
such that, as the base is wheeled across the floor, the
sheet-pressing surface presses the sheet against the floor to
dislodge dirt from the floor, and the suction draws the dirt from
the floor through the suction inlet.
Inventors: |
Sohn; Ian Emil; (South
Yarra, AU) ; Barr; Carl M.; (Avon, OH) |
Correspondence
Address: |
PATENT GROUP 2N;JONES DAY
NORTH POINT, 901 LAKESIDE AVENUE
CLEVELAND
OH
44114
US
|
Family ID: |
40377309 |
Appl. No.: |
12/127303 |
Filed: |
May 27, 2008 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
60981935 |
Oct 23, 2007 |
|
|
|
Current U.S.
Class: |
15/368 ; 15/247;
15/354; 15/415.1 |
Current CPC
Class: |
A47L 9/04 20130101; A47L
5/32 20130101; A47L 9/06 20130101 |
Class at
Publication: |
15/368 ; 15/354;
15/415.1; 15/247 |
International
Class: |
A47L 9/04 20060101
A47L009/04 |
Claims
1. A vacuum cleaning apparatus comprising: a vacuum cleaner base
including a source of suction and front and rear wheels for
wheeling the base across a floor; a nozzle assembly attached to and
supported by the base, the nozzle assembly including a suction
inlet and a sheet-pressing surface that are located in front of the
front wheels; and a disposable sheet configured to be removably
attached to the nozzle assembly such that, as the base is wheeled
across the floor, the sheet-pressing surface presses the sheet
against the floor to dislodge dirt from the floor, and the suction
draws the dirt from the floor to and through the suction inlet.
2. The apparatus of claim 1 wherein the sheet includes an airflow
opening, configured for an airflow to carry dirt through the
airflow opening to and through the suction inlet.
3. The apparatus of claim 1 wherein the suction inlet is a front
suction inlet of the nozzle assembly, and the nozzle assembly
further includes a rear suction inlet, and the sheet-pressing
surface is located between the front and rear suction inlets.
4. The apparatus of claim 3 wherein the nozzle assembly further
includes a second sheet-pressing surface, located rearward from the
rear suction inlet, that presses the sheet against the floor as the
base is wheeled across the floor.
5. The apparatus of claim 1 wherein the sheet-pressing surface is a
front sheet-pressing surface, and the nozzle assembly further
includes a rear sheet-pressing surface, and the suction inlet is
located between the front and rear sheet-pressing surfaces.
6. The apparatus of claim 1 wherein the nozzle assembly includes a
nozzle and a bracket, with the bracket removably attached to the
nozzle and including the sheet-pressing surface.
7. The apparatus of claim 1 wherein the nozzle includes a brushroll
configured to rotate against the floor to dislodge dirt from the
floor when the sheet is removed from the nozzle.
8. The apparatus of claim 7 wherein a portion of the sheet-pressing
surface is located directly under the brushroll.
9. The apparatus of claim 1 wherein the nozzle assembly is
removably attached to the base.
10. The apparatus of claim 1 wherein the base includes a mechanism
for raising and lowering the nozzle assembly.
11. The apparatus of claim 1 wherein the sheet is impregnated with
an oil.
12. A vacuum cleaning apparatus comprising: a nozzle configured to
be connected to a source of suction, the nozzle having a suction
inlet and a brushroll extending through the suction inlet and
configured to rotate against a floor to dislodge dirt from the
floor; a bracket removably attached to the nozzle and having a
sheet-pressing surface, a portion of which located directly below
the brushroll; and a disposable sheet having an opening and
configured to be removably attached to the nozzle and configured
such that, as the nozzle is moved along a floor, the sheet-pressing
surface presses the sheet against the floor to dislodge dirt from
the floor as the suction draws the dirt from the floor through the
sheet's opening and the nozzle's suction inlet.
13. The apparatus of claim 12 wherein a portion of the
sheet-pressing surface is directly under the rotational axis of the
brushroll.
14. The apparatus of claim 12 wherein the nozzle is configured to
be attached to and supported by a vacuum cleaner base that includes
the source of suction.
15. A vacuum cleaning apparatus comprising: a nozzle assembly
configured to be connected to a source of suction, the nozzle
assembly having front and rear suction inlets and a sheet-pressing
surface located between the inlet openings; and a disposable sheet
having front and rear airflow openings, and configured to be
removably attached to the nozzle assembly with the front and rear
airflow openings of the sheet respectively aligned with the front
and rear suction inlets of the nozzle assembly; and configured such
that, as the nozzle assembly is moved along a floor, the
sheet-pressing surface presses the sheet against the floor to
dislodge dirt from the floor and the suction draws the dirt from
the floor through the sheet's front and rear airflow openings and
the nozzle assembly's front and rear airflow inlets.
16. The apparatus of claim 15 wherein the nozzle assembly further
includes a second sheet-pressing surface that is located rearward
from the rear suction inlet and is configured to press the sheet
against the floor.
17. The apparatus of claim 15 wherein the nozzle assembly includes
a nozzle and a bracket, the bracket being removably attached to the
nozzle and including the sheet-pressing surface and configured to
attach the sheet to the nozzle.
18. The apparatus of claim 15 wherein the nozzle assembly includes
a spacer located in front of the front inlet to space a front end
of the nozzle assembly above the floor to maintain an airflow path
extending from in front of the nozzle assembly rearward to the
front suction opening.
19. A vacuum cleaning apparatus comprising: a nozzle assembly
having opposite front and rear side edges and opposite first and
second end edges, and configured to be connected to a source of
suction, the nozzle assembly having front and rear sheet-pressing
surfaces and an airflow inlet located between the sheet-pressing
surfaces; and a disposable sheet having an airflow opening,
configured to be removably attached to the nozzle assembly in a
mounted position in which the airflow opening is located between
the front and rear sheet-pressing surfaces and, under the first end
edge, an end opening is vertically bounded by the nozzle assembly
and the sheet and horizontally bounded by the front and rear
scrubbers; configured such that, as the nozzle assembly is moved
along a floor, the sheet-pressing surfaces press the sheet against
the floor to dislodge dirt from the floor, and the suction draws
air through the end opening to the sheet's airflow opening for the
air to carry the dirt from the floor upward through the sheet's
airflow opening to and through the nozzle assembly's airflow
inlet.
20. The apparatus of claim 19 wherein the nozzle assembly includes
a nozzle and a bracket, the bracket being removably attached to the
nozzle and including the sheet-pressing surfaces and configured to
attach the sheet to the nozzle.
21. A vacuum cleaner apparatus for use with a nozzle assembly
having a scrubber configured to support the nozzle assembly in a
cleaning position above a floor surface, the apparatus comprising:
an elongated, generally rectangular sheet configured for mounting
on the nozzle assembly in an installed position, the sheet having a
longitudinal axis, a front portion with a longitudinally extending
row of air flow inlets forward of the axis, a rear portion with a
longitudinally extending row of air flow inlets rearward of the
axis, and a central portion extending along the axis between the
rows of air flow inlets, the central portion being configured for
overlying engagement by the scrubber when the sheet is in the
installed position.
22. The apparatus of claim 21 wherein the sheet further includes
holes for hooking the sheet onto hooks of the nozzle assembly.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This claims the benefit of US Provisional Application No.
60/981935, filed Oct. 23, 2007, hereby incorporated herein by
reference.
TECHNICAL FIELD
[0002] This technology relates to vacuum cleaners.
BACKGROUND
[0003] A vacuum cleaner base can be wheeled across a floor.
Different cleaning attachments can be removably attached to the
base for cleaning different types of surfaces. These include a
floor nozzle supported by the base and a vacuuming head that is
coupled to the base by a hose. The base generates a flow of air
that draws dirt through the nozzle or the cleaning head to clean a
floor.
SUMMARY
[0004] A vacuum cleaner base includes a source of suction and front
wheels and rear wheels for wheeling the base across a floor. A
nozzle assembly is attached to and supported by the base. The
nozzle assembly includes a suction inlet and a sheet-pressing
surface that are located in front of the front wheels. A disposable
sheet can be removably attached to the nozzle assembly such that,
as the base is wheeled across the floor, the sheet-pressing surface
presses the sheet against the floor to dislodge dirt and the
suction draws the dirt from the floor to and through the suction
inlet.
[0005] The sheet includes an airflow opening configured for an
airflow to carry dirt through the airflow opening to and through
the suction inlet. The suction inlet is a front suction inlet of
the nozzle assembly, and the nozzle assembly further includes a
rear suction inlet, and the sheet-pressing surface is located
between the front and rear suction inlets.
[0006] The sheet-pressing surface is a front sheet-pressing
surface, and the nozzle assembly further includes a rear
sheet-pressing surface, and the suction inlet is located between
the front and rear sheet-pressing surfaces.
[0007] The nozzle assembly includes a nozzle and a bracket. The
bracket is removably attached to the nozzle and includes the
sheet-pressing surface. The nozzle includes a brushroll configured
to rotate against the floor to dislodge dirt from the floor when
the bracket and the sheet are removed from the nozzle. A portion of
the sheet-pressing surface is located directly under the brushroll,
and even directly under a rotational axis of the brushroll.
[0008] The nozzle assembly is removably attached to the base. The
base includes a height adjust mechanism for raising and lowering
the nozzle assembly. The sheet is impregnated with an oil. A nozzle
assembly is configured to be connected to a source of suction. The
nozzle assembly has front and rear suction inlets and a
sheet-pressing surface located between the front and rear inlets. A
disposable sheet has front and rear airflow openings. The sheet is
configured to be removably attached to the nozzle assembly with the
front and rear openings of the sheet respectively aligned with the
front and rear inlet openings of the nozzle assembly. As the nozzle
assembly is moved along a floor, the sheet-pressing surface presses
the sheet against the floor to dislodge dirt from the floor, and
the suction draws the dirt from the floor through the sheet's front
and rear openings and the nozzle assembly's front and rear
inlets.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIG. 1 is a perspective view of parts that can be
interconnected in different combinations for different modes of
vacuum cleaning, the parts including a base, a floor nozzle, a
vacuuming head, a hose structure, a cover sheet, and a bracket.
[0010] FIG. 2 is a perspective view of the floor nozzle.
[0011] FIG. 3 is a perspective view of the floor nozzle attached to
the base.
[0012] FIG. 4 is a perspective view of the vacuuming head.
[0013] FIG. 5 is a perspective view of the vacuuming head attached
to the base.
[0014] FIG. 6 is one perspective view of the bracket, taken from
beneath.
[0015] FIG. 7 is another perspective view of the bracket, taken
from above.
[0016] FIG. 8 is a top view the cover sheet.
[0017] FIG. 9 is a perspective view the sheet being attached to the
bracket.
[0018] FIG. 10 is a sectional view of the bracket being attached to
the vacuuming head.
[0019] FIG. 11 is a sectional view of a vacuuming head assembly
comprising the vacuuming head, the bracket and the sheet.
[0020] FIG. 12 is a perspective view of the vacuuming head assembly
showing paths of air flowing into the assembly.
[0021] FIG. 13 is a sectional view of the base, the floor nozzle,
the bracket and the sheet attached together.
[0022] FIG. 14 is a perspective view of the bracket and the sheet
attached to another vacuuming head.
DESCRIPTION
[0023] The apparatus shown in the drawings has parts that are
examples of the elements recited in the claims. The illustrated
apparatus thus includes examples of how a person of ordinary skill
in the art can make and use the claimed invention. It is described
here to meet the requirements of enablement and best mode without
imposing limitations that are not recited in the claims.
Overview
[0024] The apparatus 1 shown in FIG. 1 is a vacuum cleaner for
cleaning a floor 6. It includes a base 10 configured to be wheeled
across the floor 6, a handle 14 extending upward from the base 10,
and a filter bag 16. A floor nozzle 20 can be attached to, and
supported by, the base 10 for vacuum cleaning the floor 6. A
cleaning attachment such as a vacuuming head 22 can be coupled by a
hose assembly 24 to the base 10 for cleaning the floor 6 and
above-the-floor surfaces. A bracket 30 can connect a disposable
cover sheet 32 to the cleaning head 22 and to the floor nozzle
20.
Base
[0025] The base 10 is located on an axis Al and has
axially-opposite front and rear ends 41 and 42. The base 10 has two
front wheels 51 and two rear wheels 52 for wheeling the base 10
over the floor 6. It also has a suction inlet 54 in front of the
front wheels 51.
Floor Nozzle
[0026] As shown in FIG. 2, the floor nozzle 20 is located on an
axis A2 and has axially opposite front and rear ends 101 and 102.
The nozzle 20 further has a brushroll 110 with tufts 112 of
bristles projecting through a suction inlet 120 at the bottom 122
of the nozzle 20. The inlet 120 is surrounded by front and rear
flanges 131, 132 that extend respectively forward and rearward from
an upwardly-extending surface 134 surrounding the nozzle 20.
[0027] FIG. 3 shows an upright vacuum cleaner 160 in which the
floor nozzle 20 is attached to the front end 41 of the base 10. The
nozzle 20 is supported by the base 10 and the base's wheels 51, 52,
so as to move in unison with the base 10 as the base 10 is wheeled
by its handle 14 across the floor 6. The brushroll 110 rotates
against the floor 6 to dislodge dirt from the floor 6. The base 10
is configured to generate an air flow that draws dirt through the
nozzle inlet 120 and the base's suction inlet 54 (FIG. 1) and
deposits the dirt in the filter bag 16.
Vacuuming Head
[0028] The vacuuming head 22 is shown in FIG. 4. It is a type of
vacuuming nozzle. It is an elongated, generally rectangular
structure with a longitudinal axis A3, a transverse axis A4, and
front and rear side edges 201 and 202. The head 22 has a planar
bottom surface 222 configured to face the surface being cleaned.
Two front wheels 231 and two rear wheels 232 extend through holes
in the bottom surface 222. The bottom surface 222 defines a
longitudinally extending series of front suction inlets 241 and a
longitudinally extending series of rear suction inlets 242. A
longitudinally extending scrubber 244 is located between the front
and rear air inlets 241 and 242. The scrubber 244 is a brush strip
with bristles or fibers projecting downward from the bottom surface
222. Front and rear flanges 251 and 252 extend, with a slightly
upward slant, respectively forward and rearward from the planar
bottom surface 222. The head 22 has an outlet tube 256 that is
pivotable (arrow 257) and rotatable (arrow 258) relative to the
remainder of the head 22.
[0029] FIG. 5 shows a canister vacuum cleaner 260 in which the
cleaning head 22 is attached to the base 10 by the hose assembly
24. One end of the hose assembly 24 is coupled to the suction inlet
54 (FIG. 1) of the base 10. The opposite end of the hose assembly
24 is coupled to the outlet tube 256 of the vacuuming head 22. In
operation, the head 22 is moved forward and rearward across a
surface to be cleaned, which is the floor 6 in this example. The
base 10 is configured to be pulled across the floor 6 by the hose
24.
[0030] Referring to FIGS. 4-5, the head's wheels 231 and 232 space
the head's bottom surface 222 a set distance from the floor 6. The
scrubber 244 dislodges dirt from the floor 6. The base 10 generates
an air flow that draws the dirt through the vacuuming head's inlets
241, 242 and the hose 24 and deposits the dirt in the filter bag
16.
Bracket
[0031] As shown in FIG. 6, the bracket 30 also is an elongated,
generally rectangular structure with a longitudinal axis A5 and a
transverse axis A6. The bracket 30 further has front and rear side
edges 301 and 302 and opposite end edges 324. A bottom surface 340
of the bracket 30 defines a longitudinally extending series of
front air inlets 341 and a longitudinally extending series of rear
air inlets 342.
[0032] A longitudinally extending front scrubber 351 is located
between the front inlets 341 and the rear inlets 342. The front
scrubber 351 preferably is a single elongated piece of elastic foam
rubber, e.g., a sponge. A rear scrubber 352 is located rearward
from the rear openings 342 and is parallel with the front scrubber
351. The rear scrubber 352 is a brush strip with bristles or fibers
projecting downward from the bracket's bottom surface 340. The
brush strip 352 is bounded by a ridge extending downward from the
bracket's bottom surface 340 to protect the bristles. The front and
rear scrubbers 351 and 352 have respective bottom surfaces 361 and
362 configured to function as sheet-pressing surfaces by pressing
the cover sheet 32 (FIG. 1) against the floor 6.
[0033] Two front spacers 371 extend downward from respective
opposite front corners of the bracket 30. Two rear spacers 372
extend rearward from respective opposite rear corners of the
bracket 30. As shown in FIG. 7, the bracket 30 has front and rear
outer hooks 381, 382 and front and rear inner hooks 391, 392 that
project upward.
Cover Sheet
[0034] The cover sheet 32 is shown in FIG. 8. It might be cut from
of a mat of air-permeable non-woven melt-blown polypropylene fibers
that is impregnated with mineral oil. Like the head 22 and the
bracket 30, the sheet 32 is elongated and generally rectangular
with longitudinal and transverse axes A7 and A8. The sheet 32 has
eight attachment holes 420 for hooking the sheet 32 onto the hooks
381, 382, 391, 392 (FIG. 7) of the bracket 30. The sheet 32 has a
longitudinally-extending row of front airflow openings 441 shaped
similar to, and configured to be aligned with, the bracket's front
openings 341. The sheet 32 further has a longitudinally-extending
row of rear openings 442 that are shaped similar to, and configured
to be aligned with, the bracket's rear openings 342.
[0035] The sheet 32 has a front portion 451 located in front of the
front openings 441, a middle portion 452 located between the front
and rear openings 441, 442, and a rear portion 453 located rearward
from the rear openings 442. The middle portion 452 is configured to
bear the pressure applied by the bracket's front sheet-pressing
surface 361. The rear portion 453 is configured to bear the
pressure applied by the bracket's rear sheet-pressing surface
362.
Using the Cover Sheet with the Cleaning Head
[0036] To attach the sheet 32 to the bracket 30, first the bracket
30 is placed downward onto the sheet 32 as shown in FIG. 9. Then,
the sheet's front and rear portions 451, 453 are wrapped
respectively about the front and rear side edges 301 and 302 of the
bracket 30. As indicated by arched arrows, the attachment holes 420
in the front and rear portions 451 and 453 of the sheet 32 are
slipped over the corresponding hooks 381, 382, 391, 392 of the
bracket 30, to secure the sheet 32 to the bracket 30. The sheet 32
is thus attached to the bracket 30 as shown in FIG. 10. The sheet
32 is not wrapped about the bracket's opposite end edges 324.
[0037] To attach the bracket 30 to the cleaning head 22, the
bracket 30 is pressed up against the head's bottom surface 222 as
indicated by arrow 470 in FIG. 10. The bracket's outer hooks 381,
382 hook onto the head's front and rear flanges 351, 352. The
bracket's inner hooks 391, 392 extend through respective attachment
holes 280 in the head's bottom surface 222.
[0038] The head 22, the bracket 30 and the sheet 32 are thus
attached together to form a cleaning head assembly 500 shown in
FIG. 11. The front and rear scrubbers 351, 352 keep the bracket's
bottom surface 340 and its front and rear inlets 341, 342 spaced
above the floor 6. As the assembly 500 is moved forward (arrow 501)
and backward, the front and rear sheet-pressing surfaces 361 and
362 press the sheet 32 against the floor 6 to scrub or scrape dirt
from the floor 6. Due to resiliency of the scrubbers 351 and 352,
when the middle and rear portions 452 and 453 of the sheet 32 ride
over a dirt particle that raises one point on the sheet 32 above
the floor 6, adjacent points on the sheet 32 can remain under
load.
[0039] The front airflow openings 241, 341, 441 of the three
components 22, 30, 32 of the assembly 500 are mutually aligned.
This enables a front airflow 511 to carry dirt from the floor 6
through the front openings 241, 341, 441 into the vacuuming head
22. Similarly, the rear openings 242, 342, 442 are mutually
aligned, to enable a rear airflow 512 to carry dirt through the
rear openings 242, 342, 442 into the vacuuming head 22.
[0040] By manipulating the head's outlet tube 256, the head 22 can
be pivoted rearward about the rear scrubber 352 to lift the front
scrubber 351 from the floor 6 and increase the airflow into the
front openings 241, 341, 441. The head 22 can also be pivoted
forward about the front scrubber 351 to lift the rear scrubber 352
above the floor 6 and increase the airflow through the rear
openings 242, 342, 442. When the head 22 is pivoted, the front and
rear spacers 371, 372 keep the front and rear ends 321, 322 of the
bracket 30 spaced above the floor 6.
[0041] Air that provides the upward airflows 511 and 512 can enter
the assembly 500 through several paths. As shown in FIG. 12, these
include a rearward path 520 at the front of the assembly 500 and a
pair of end paths 521 and 522 at each end of the assembly 500. The
rearward path 520 extends under the bracket's front side edge 301.
The end paths 521 and 522 extend under the bracket's opposite end
edges 324 and through front and rear openings 531 and 532 beneath
the opposite end edges 324. The openings 531 and 532 are vertically
bounded by the sheet 32 and the bottom surface 340 of the bracket
30. The rear opening 532 is horizontally bounded by the front and
rear scrubbers 351 and 352. These paths 521 and 522 are made
possible by the bracket's bottom surface 340 being raised above the
floor 6 by the scrubbers 351 and 352 and by the sheet 32 not being
wrapped about the ends 324 of the bracket 30.
[0042] The mineral oil impregnated in the sheet 32 increases the
sheet's adhesion to dust and reduces the sheet's friction with the
floor 6. However, friction with the front sheet-pressing surface
361 is increased by its having a high-friction rubbery texture. The
sheet 32 protects the floor 6 from being marred by hard surfaces of
the cleaning head 22. It also prevents the floor 6 from abrading
the scrubbers 351, 352. Dirt picked up by the sheet 32 is disposed
of when the used sheet 32 is discarded and replaced with a new
one.
Using the Cover Sheet with the Floor Nozzle
[0043] To attach the sheet 32 to the floor nozzle 20, first the
sheet 32 is attached to the bracket 30 as explained above with
reference to FIG. 9. Then, referring to FIGS. 2 and 10, the bracket
30 is pressed upward against the nozzle's bottom 120. The bracket's
inner hooks 391, 392 extend through the nozzle inlet 120 to hook
onto upward-facing surfaces inside the nozzle 20.
[0044] This yields a nozzle assembly 600 shown in FIG. 13,
comprising three components--the nozzle 20, the bracket 30, and the
sheet 32. These three components, including their respective air
inlet openings 120, 341, 342, 441, 442 are all located in front of
the front wheels 51. This configuration, relative to if these
components were not in front of the front wheels 51, facilitates
mounting of the nozzle 20 on the base 10, and mounting the other
components 32, 30 on the nozzle 20, by positioning the nozzle 20
out in front of the base 10 and its wheels 51, 52. This
configuration also enables locating the air inlet openings 120,
341, 342, 441, 442 closer to a household wall.
[0045] The bracket 30 lifts the brushroll 110 away from the ground
6, with the front scrubber 351 located between the brushroll 110
and the ground 6. The front scrubber's sheet-pressing surface 361,
along with the sheet 32, takes the place of the brushroll 110 in
dislodging dirt from the floor 6. Accordingly, at least a portion
of the front sheet-pressing surface 361 is located directly under
the brushroll 110, and preferably even directly under the
rotational axis A9 of the brushroll 110. Preferably, the sheet
pressing surface 361 is axially centered under the brushroll's
rotational axis A9.
[0046] In operation, a user wheels the base 10 forward and backward
by the handle 14. Concurrently, the bracket's front and rear
sheet-pressing surfaces 361, 362 press the sheet 32 against the
floor 6 for the sheet 32 to scrape dirt from the floor 6. In
contrast to use of the sheet 32 with the cleaning head 22, in which
the bracket 30 can be pivoted forward or backward by the user, use
of the sheet 32 with the nozzle 20 does not enable such pivoting.
The angular orientation of the bracket 30 and its height from the
floor 6 are kept constant by the base 10. The bracket 30 can be
raised or lowered, to vary the pressure of the scrubbers 351, 352
against the floor 6, only by raising or lowering the entire nozzle
20 via a height adjust mechanism 610 on the base 10.
[0047] The bracket 30 and sheet 32 protect the floor 6 from being
marred by hard surfaces of the nozzle 20. The sheet 32 prevents the
floor 6 from abrading the scrubbers 351, 352. The sheet 32 also
picks up dirt, which is disposed of when the used sheet 32 and is
replaced with a new one.
Using the Cover Sheet with Another Cleaning Head
[0048] FIG. 14 shows the bracket 30 and the sheet 32 attached to a
second cleaning head 22'. This head 20' is similar to the first
cleaning head 22 described above. The second cleaning head 22' is
connected to the bracket 30 in the same way as the first cleaning
22 is attached to the bracket 30. Also, an assembly comprising the
second head 22', the bracket 30 and the sheet 32 has the same cross
section as the assembly 500 (FIG. 11) comprising the first head 22,
the bracket 30 and the sheet 32. The second head 22' differs from
the first head 22 in that it is shorter in the transverse
direction. Consequently, two portions 700 of the bracket 30 extend
transversely outward from the second head 22' in two opposite
directions. These portions 700 contain the bracket's inner hooks
391, 392. So the bracket 30 is secured to the second head 22' by
only its outer hooks 381, 382.
[0049] This written description uses examples to disclose the
invention, including the best mode, and also to enable any person
skilled in the art to make and use the invention. The patentable
scope of the invention is defined by the claims, and may include
other examples that occur to those skilled in the art. Such other
examples are intended to be within the scope of the claims if they
have elements that do not differ from the literal language of the
claims, or if they include equivalent elements with insubstantial
differences from the literal language of the claims.
* * * * *