CA2249690C

CA2249690C - Self-contained portable/mountable air cleaner

Info

Publication number: CA2249690C
Application number: CA002249690A
Authority: CA
Inventors: Terrence L. Stanek
Original assignee: Emerson Electric Co
Current assignee: Emerson Electric Co
Priority date: 1998-01-06
Filing date: 1998-10-26
Publication date: 2001-05-22
Anticipated expiration: 2018-10-26
Also published as: CA2249690A1

Abstract

A portable, mountable air cleaner that is fashioned of a durable, molded plastic so as to be light weight; dimensioned to fit between typical 16 inch joists in a ceiling structure; containing a dual air filtration system; fashioned and configured so that each filter may be easily removed for cleaning; and that is capable of operation either resting on the ground or while suspended from a wall or ceiling structure.

Description

~SPD:074-CA

SELF-CONTAINED PORTABLE/MOUNTABLE AIR CLEANER
BACKGROUND OF THE INVENTION
The present invention relates to a portable/mountable air cleaner, and more specifically, to an air cleaner which includes a carrying handle extending from an air cleaner elongated body, ~o dimensioned and configured to be mountable between 16 inch joists of a ceiling structure (measured from center to center of the joists), a dual air filter system where a fine air filter is mounted within the elongated body, and a pull-chain switching mechanism mounted in a recess of the handle for actuating the air cleaner.
Because home and industrial workshops generate a substantial quantity of saw dust and ~s other fine particulate matters which are readily dispersed in the air, fine dust air cleaners have been developed. They are generally of two types: a floor mounted/console unit or a ceiling/wall mounted device. Typical examples of floor mounted/console units are shown in U.S. Patent Nos. 3,802,168 and 4,894,071 which utilize rollers or wheels to move the fine dust air cleaner to a desired location. An example of a ceiling or wall mounted air cleaner device is shown in U.S.
2o Patent No. 3,930,818 where a more permanent type of mounting system is used.
Air cleaners with forced air filters and associated blowers are generally preferable over electrostatic type air cleaners because of lower cost, easier installation and maintenance, and higher capacity. On the other hand, air cleaners utilizing forced air filters and associated blowers have been unable to process large amounts of highly contaminated air and have also been 2s difficult to service for cleaning and/or replacement of filters. As also indicated above, prior art air cleaners have either been of the portable or mountable type, but typically have not been both.
Some users have preferred to move an air cleaner unit to a desired location, while others prefer to mount the air cleaner in a more permanent location. In accordance with the present invention, it is possible to provide a self contained portable/mountable air cleaner which can provide both the portable and mountable desired functions.
Moreover, constructing the air filter principally of a durable molded plastic allows for a light-weight air cleaner that can be easily moved or lifted for mounting overhead in compliance with weight limit standards for such activities.
According to the present invention, the portable/mountable air cleaner discloses an optional mounting strap system which facilitates installation when mounting to a ceiling and is dimensioned to fit between typical 16 inch joists in common ceiling structures. As this 16 inch measurement is made from center to center and the standard joist width is 3 inches, the unit must be less than 13 inches in maximum width to fit between such joists. Being able to mount the ~o unit between such joists is beneficial as it allows for a greater head clearance, better space utilization, and reduces the chances of head injuries caused by running into the unit.
Furthermore, the present invention discloses an improved integrally molded elongated body designed to contain a dual filter system including a coarse air filter and a fine air filter which can be easily accessed and removed for cleaning. Moreover, the present invention discloses a is recessed handle which contains additional means for activating the air cleaner appropriate for ceiling suspension.
SUMMARY OF THE INVENTION
Among the several objects and advantages of the present invention include:
The provision of a new and improved portable/mountable air cleaner;
2o The provision of the aforementioned air cleaner which includes a carrying handle for transporting the air cleaner to a desired location or for mounting the air cleaner to a ceiling, wall or other structure, as may be desired;
The provision of the aforementioned air cleaner which can be mounted between the typical 16 inch joists of a ceiling structure;
2s The provision of the aforementioned air cleaner which includes an integrally molded elongated body designed to contain a dual air filter system including a coarse air filter and a fine air filter;

The provision of the aforementioned air cleaner in which the design of the air filters, their positioning within the elongated body, and the structure of their support within the elongated body are all fashioned so that both filters may be easily removed and cleaned;
The provision of the aforementioned invention with a pull chain for activating the unit s and an activation light, both designed to aid in operating the unit when it is suspended from the ceiling.
Briefly stated, the portable/mountable air cleaner of the present invention includes an elongated body containing an air cleaner with a power driven air moving assembly. A
supporting base extends from the elongated body for resting on a supporting surface. A carrying io handle extends from the elongated body generally opposite the supporting base to facilitate carrying the air cleaner. Spaced suspension straps are associated with the elongated body for mounting the elongated body to a ceiling or wall structure.
The spaced suspension straps are preferably detachably associated with the elongated body. The spaced suspension straps also preferably extend transversely to the elongated body i s and extend through spaced slots formed in the elongated body. Preferably, the spaced slots are formed in the carrying handle on each side of an opening in the carrying handle that is large enough to facilitate grasping by a user. Fasteners such as hook fasteners or the like may be attached to each of outer ends of the spaced suspension straps for engaging complementary fasteners mounted to the ceiling or wall structure.
2o Preferably, the elongated body is configured, arranged, and dimensioned to fit between the typical 16 inch joists in a ceiling structure (measured from center to center of the joists). The body of the air cleaner is also preferably constructed of a durable, light-weight plastic which can be easily transported and lifted for mounting overhead.
A switch for energizing the air cleaner is mounted in a recessed area of the carrying zs handle. The switch preferably includes a pull cord and toggle combination for activating or deactivating the switch. The pull cord allows for activation while the unit is suspended and the toggle allows for activation while the unit is resting on a supporting surface. An activation light is also mounted in a recessed area of the carrying handle so that someone on the ground can readily ascertain whether the supported unit is activated.

The elongated body also preferably further includes a dual filtration system including coarse and fine air filters and an integrally molded elongated body designed to hold both filters.
The filters and the elongated body are both fashioned so that the filters may be easily accessed for cleaning.
These and other objects and advantages of the present invention will become apparent from the description that follows.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings, Figure 1 is a perspective view of a portable/mounting fine dust air cleaner of the present invention;
io Figure 2A is a side elevational view, partly in section, illustrating the air cleaner mounted between the joists in a ceiling structure;
Figure 2B is a side elevational view, partly in section, showing the air cleaner partially visible below the joists in a ceiling structure;
Figure 2C is an end elevational view, partially in section, showing the air cleaner is mounted between the joists in a ceiling structure; and Figure 3 is an enlarged side elevational view, partially in section, illustrating the air cleaner and its motor, motor frame, and venturi.
Figure 4 is an enlarged partial side elevational view, partially in section, illustrating the air cleaner, and the coarse and fine air filters, and their supporting components.
2o Corresponding reference numerals will be used throughout the several figures of the drawings.

-$-DESCRIPTION OF THE PREFERRED EMBODIMENTS
The following detailed description illustrates the invention by way of example and not by way of limitation. This description will clearly enable one skilled in the art to make and use the invention, and describes several embodiments, adaptations, variations, alternatives and uses of s the invention, including what I presently believe is the best mode of carrying out the invention.
The portable/mountable air cleaner 1 illustrated in the drawings includes a hollow tubular and generally cylindrically shaped elongated body 3 preferably formed from a strong and durable plastic material by suitable molding techniques. The elongated body includes an upstanding integral carrying handle 5 for lifting and transporting the air cleaner 1 to any desired ~o location. Generally opposite the upstanding integral carrying handle 5 is a supporting base 7 for resting the air cleaner 1 on a supporting surface. In this regard, it will be noted that the supporting base 7 extends laterally outwardly beyond the elongated body 3 on opposite sides thereof in order to provide a stable and secure supporting structure for resting the air cleaner 1 on a supporting surface.
is The air cleaner 1 is also capable of being mounted between adjacent joists J of a ceiling structure C, as illustrated in Figures 2B-2C of the drawings. Alternatively, the air cleaner 1 may be mounted across the joists J or on a wall or other structure (not shown) as will be apparent.
For mounting the air cleaner 1 between the adjacent joists J of a ceiling structure C, it will be seen that the elongated body 3 of the air cleaner 1 is dimensioned, configured and arranged with 2o a maximum width of less than 13 inches to fit between the common 16 inch spaced joists J
(measured from center to center) while the supporting base 7 rests against an interconnecting strut of the ceiling structure C, as best seen in Figure 2C of the drawings.
More specifically, in the preferred embodiment of this invention, the elongated body would be dimensioned generally cylindrically with a maximum diameter of about 11.5 inches.
2s The air cleaner 1 is constructed to include spaced, detachable suspension straps 9 which extend through spaced slots 11 on opposite sides of an opening 13 in the carrying handle 5. The opening 13 in carrying handle 5 is large enough to facilitate grasping by a user, while the spaced slots 11 detachably receive the spaced suspension straps 9. At the outer opposite ends of each of the spaced suspension straps 9, complementary openings 15 may be provided for engaging complementary hook fasteners 17 mounted at the lower end of the spaced joists J as shown in Figure 2C of the drawings. Alternatively, the outer free ends of the spaced suspension straps 9 may themselves be provided with hook fasteners, as shown in Figure 3 of the drawings, for engaging complementary fasteners (not shown) extending from the lower end of the spaced s joists J.
The air cleaner 1 of the present invention further includes an integrally molded motor frame and venturi 35, as best seen in Figure 3 of the drawings. Specifically, the integrally molded motor frame and venturi 35 is supported by suitable fasteners or the like within the elongated body 3 in the position illustrated in Figure 3. The integrally molded motor frame and io venturi 35 includes a motor supporting section 37 and a venturi section 39.
The motor supporting section 37 supports the motor 41 in a generally centralized position within the elongated body 3. The motor 41 drives an air moving assembly 43 which, in Figure 3, is a power driven fan blade. The air moving assembly 43 can also be a blower wheel.
The venturi section 39 is located in proximity to the motor driven air moving assembly 43 to facilitate the ~s flow of air through the elongated body 3. In this regard, it will be noted that the venturi section 39 includes a restricted throat 45 surrounding the air moving assembly 43 to facilitate the flow of air through the elongated body 3.
In view of the above description, it will be appreciated that the air cleaner 1 can be used individually or in banks of air cleaners as portable units which are placed in proximity to an 20 operation that creates contaminated air, or alternatively, the air cleaner 1 can be mounted between spaced joints J as shown in Figures 2A-2C of the drawings, in single or multiple units for maximum efficiency.
For energizing the air cleaner l, a switch 23 is mounted in a recessed area 21 of the carrying handle 5. As shown in Figure 2B of the drawings, the switch 23 is activated by both a 2s toggle switch and a pull cord that hangs downwardly from the air cleaner 1 when mounted between spaced joists J as shown in Figure 2B of the drawings. When resting on a supporting surface, the unit may be activated by the toggle switch. The pull cord of the switch 23 is utilized for activating or deactivating the switch 23 when the unit is suspended.
Moreover, as shown in Figure 1, the unit contains an activator light 19 which is illuminated when the unit is activated.

_7_ This further assists people on the ground in determining when the unit is activated, particularly in areas where shop noise may make the sound of the unit inaudible. In its preferred embodiment, the walls of the recessed area in the handle extends above the height of the activator light and switch and protects them from damage during transportation of the unit or s through normal shop activities.
To function as an air cleaner, the elongated body 3 as shown in Figure 3, contains a generally flat coarse air filter 31, a bag-like fine air filter 29, and a power driven fan blade 43, all positioned so that the coarse air filter 31 is nearer to the air intake end of the elongated body 3 than the fine air filter 29, and where the fine air filter 29 is positioned nearer to the air intake end io that the power driven fan blade 43. The air cleaner 1 includes an elongated body 3 with a defined air intake and exhaust end. It is fashioned to include a releasable/removable closure 25 at the intake end and a releasable/removable closure 27 at the exhaust end of the elongated body 3.
The air cleaner 1 is designed with specific features to allow stable support of and easy is access for cleaning to the coarse air filter 31 and the fine air filter 29.
As shown in Figure 4, the elongated body 3 is fashioned at the air intake end with recesses 46 to receive the coarse air filter 31 and a grating 33 to give support to the coarse air filter 31 on the exterior of the elongated body. The mounting of the coarse air filter 31 on the outside of the elongated body 3 is important as it is anticipated that the coarse air filter will need to be cleaned on a more regular 2o basis than the fine air filter. One will note that the recesses 46 and the grate 33 which receive and give support to the coarse air filter 31 are fashioned so that the coarse air filter 31, made of a flexible, collapsible material, can be inserted into and removed from its position by compressing the filter. In its preferred embodiment, the air cleaner 1 includes a coarse air filter 31 made of a flexible, collapsible material which is flat and dimensioned in a fashion to fit within the zs receptors 46 over the supporting grate 33 defined on the air intake end of the elongated body. It is further preferred that the coarse air filter 31 be made of polyurethane open cell foam. As an alternative, the coarse air filter 31 may also be made of a non-woven polyester or electrostatic polypropylene.

_g_ With regard to the fine air filter 29, the elongated body 3 is molded with defined receptors 47 along its interior cavity to receive and hold the fine air filter 29. The fine air filter 29 is mounted on a flexible ring or support structure 48 that can be collapsed and will expand to hold itself in place on the interior of the elongated body 3 in conjunction with receptors 47 s molded on the interior cavity of the elongated body 3. In its preferred embodiment, the fine air filter 29 is elongated, expands along a portion of the length of the elongated body 3, has an opening on the air intake end, and is either conically shaped, or partially conically shaped with a flat surface on the exhaust end which has a smaller surface area than the opening on the air intake end. As a further preferred embodiment, the fine air filter 29 is made of a flexible cloth-~o like material. In its further preferred embodiment, the fine air filter 29 is made of electrostatic carbon-activated polypropylene. As an alternative, the fine air filter may also be made of electrostatic polypropylene, non-woven polyester, or polyurethane open cell foam. Carbon-activated polypropylene is preferred as it also has an odor-reducing effect.
One can note that the molded receptors 47 for the fire air filter 29 are fashioned so that the filter may be removed and ~s inserted from the air intake end of the elongated body 3.
Finally, in its preferred embodiment, the air cleaner 1 is constructed of durable plastic which has been molded to define an elongated body 3, an interior cavity which contains an air moving assembly 43, a motor 41, a fine air filter 29, and a coarse air filter 31. The elongated body 3 is also molded to include support structures for the motor 37, fine air filter 47, and coarse 2o air filter 33 and 46. This material and construction is used to result in a light-weight air cleaner which is portable and mountable. In its further preferred embodiment, the air cleaner 1 is of such a weight that an average person can easily lift it for mounting overhead.
In its further preferred embodiment, the weight of the entire unit is less than 30 pounds to be in compliance with the ergonomic standard applicable to lifting and carrying objects that "Bulky articles should 2s not weight more than about 30 lbs.;" or to otherwise be in compliance with the maximum load limits published by the National Institute of Safety and Health in the Work Practice Guide for Manual Lifting as stated in Woodson, et. al., The Human Factors Design Handbook, 2d Ed., p.
623 (McGraw-Hill 1992). In its further preferred embodiment, the weight of the entire unit is about 10.5 pounds.

From the foregoing, it will now be appreciated that the portable/mountable air cleaner 1 of the present invention enables the air cleaner 1 to be readily transported by the carrying handle to a desired location for resting on a supporting surface or can be mounted through the spaced suspension straps 9 to a ceiling structure C, such as by locating the air cleaner 1 between 16 inch s spaced joists J of the ceiling structure. The air cleaner 1 can be mounted to a ceiling structure in any desired manner or to a wall or other structure, if desired. The pull chain 23 and the activation light 19 both aid in utilizing the air cleaner 1 when it is suspended. Moreover, the receptors 46 and 47 are both fashioned to hold a dual filter filtration system including a coarse air filter 31 and a fine air filter 29. Filters 31 and 29, receptors 46 and 47, and the releasable/
io removable closures 25 and 27 are all fashioned so that the coarse air filter 31 and the fine air filter 29 can be easily removed for cleaning.
In view of the above, it will be seen that the several objects and advantages of the present invention have been achieved and other advantageous results have been obtained.
As various changes could be made in the above constructions without departing from the i> scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Claims

CLAIMS:

1. An air cleaner, comprising:
a hollow, generally tubular body, the body defining a width that allows the body to fit between adjacent joists of a ceiling structure that are spaced 16 inches apart from center to center, the body having an air intake end and an exhaust end;
a first closure removably covering the intake end and having an air intake opening therethrough covered by a grate;
a generally flat prefilter supported by the grate covering the air intake opening, the first closure having receptors to removably receive the prefilter and hold the prefilter against the grate;
a motor mounted within the body;
an air moving assembly coupled to the motor and driven thereby to move air into the intake end through the body and out the exhaust end;
a fine air filter positioned within the body, the body having a receptor therein to removably receive the fine air filter and hold the fine air filter in a location between the prefilter and the motor such that the fine air filter is accessible via the intake end;
a carrying handle extending from the body; and a supporting base extending from the body generally opposite the carrying handle.

2. The air cleaner of claim 1, wherein the receptors of the first closure comprise recesses to receive the prefilter.

3. The air cleaner of claim 1, wherein the receptors and grate of the first closure are fashioned so that the prefilter may be inserted into and removed from the first closure by compressing the filter.

4. The air cleaner of claim 2, wherein the prefilter comprises a flexible collapsible material.

5. The air cleaner of claim 1, wherein the prefilter is positioned outside the grate covering the intake opening.

6. The air cleaner of claim 1, wherein the receptor for receiving the fine air filter comprises a plurality of receptors molded into the body.

7. The air cleaner of claim 1, wherein the fine air filter is generally comically shaped and expands along a portion of the length of the body.

8. The air cleaner of claim 1, further comprising a suspension strap connectable to the body and to the joists to mount the body to the ceiling structure.

9. The air cleaner of claim 8, wherein the carrying handle defines an opening, and wherein strap receiving slots are positioned on either side of the opening for receiving the suspension straps.

10. The air cleaner of claim 9, wherein the carrying handle defines the strap receiving slots.

11. The air cleaner of claim 8, further comprising fasteners connected to the suspension strap.

12. The air cleaner of claim 1, further comprising a switch for energizing the motor, the switch positioned proximate the exhaust end.

13. The air cleaner of claim 12, further comprising a pull chain connected to the switch for activating the switch.

14. The air cleaner of claim 12, further comprising an indicator light positioned adjacent the switch, wherein the light is illuminated when the motor is energized.

15. The air cleaner of claim 1, wherein the air moving assembly comprises a fan.

16. The air cleaner of claim 1, wherein the air moving assembly comprises a blower wheel.

17. An air filtration system, comprising:
a ceiling surface supported by a pair of joists affixed thereto, the joists defining a space therebetween;

a hollow, generally tubular body removably mounted between the joists via a suspension strap, the body having an air intake end and an exhaust end;
a first closure removably covering the intake end and having an air intake opening therethrough covered by a grate;
a generally flat prefilter supported by the grate covering the air intake opening, the first closure having receptors to removably receive the prefilter and hold the prefilter against the grate;
a motor mounted within the body;
an air moving assembly coupled to the motor and driven thereby to move air into the intake end through the body and out the exhaust end; and a fine air filter positioned within the body, the body having a receptor therein to removably receive the fine air filter and hold the fine air filter in a location between the prefilter and the motor such that the fine air filter is accessible via the intake end.

18. The air filtration system of claim 17, further comprising a carrying handle extending from the body a supporting base extending from the body generally opposite the carrying handle, wherein the body may be dismounted from the joists, moved to a desired location via the handle and placed on a surface to be supported by the base.