US4577365A — Rechargeable vacuum cleaner

Claim 1

Independent Claim 277 words

A rechargeable vacuum cleaner comprising a housing formed to present an intake nozzle, a body portion and a handle portion, wherein said body portion mounts a motor fan suction unit and a filter arrangement and has outlet apertures therein for air from said motor fan suction unit and said handle portion provides means for holding the rechargeable vacuum cleaner, houses a rechargeable battery and incorporates a socket whereby said battery can be connected to charging means therefore, wherein said filter arrangement comprises: a disc of flexible filter material so mounted as completely to obstruct a passageway within said housing for air flowing from said intake nozzle to said motor fan suction unit such that all air passing through said passageway must pass through said disc of flexible filter material; inner and outer annular members sandwiching therebetween said disc of flexible filter material, each of said two annular members includes a cylindrical wall with said cylindrical walls telescoped within each other, the inner one of said two annular members defines a grid frameword, the outer one of said two annular members is cup shaped and has slits in its said outer cylindrical wall to make said outer cylindrical wall flexible; said disc of flexible filter material is stretched over said grid framework when said inner one of said two members is telescopically received and retained within said outer one of said two members with said disc of flexible filter material located therebetween; and a forward part of said body portion has projecting plugs to engage within said inner cylindrical wall of said inner one of said two annular members to locate the filter arrangement on said body portion.

Claim 2

Dependent Claim 277 words

A rechargeable vacuum cleaner comprising a housing formed to present an intake nozzle, a body portion and a handle portion, wherein said body portion mounts a motor fan suction unit and a filter arrangement and has outlet apertures therein for air from said motor fan suction unit and said handle portion provides means for holding the rechargeable vacuum cleaner, houses a rechargeable battery and incorporates a socket whereby said battery can be connected to charging means therefore, wherein said filter arrangement comprises: a disc of flexible filter material so mounted as completely to obstruct a passageway within said housing for air flowing from said intake nozzle to said motor fan suction unit such that all air passing through said passageway must pass through said disc of flexible filter material; inner and outer annular members sandwiching therebetween said disc of flexible filter material, each of said two annular members includes a cylindrical wall with said cylindrical walls telescoped within each other, the inner one of said two annular members defines a grid frameword, the outer one of said two annular members is cup shaped and has slits in its said outer cylindrical wall to make said outer cylindrical wall flexible; said disc of flexible filter material is stretched over said grid framework when said inner one of said two members is telescopically received and retained within said outer one of said two members with said disc of flexible filter material located therebetween; and a forward part of said body portion has projecting plugs to engage within said inner cylindrical wall of said inner one of said two annular members to locate the filter arrangement on said body portion.

Claim 3

Dependent Claim 246 words

A rechargeable vacuum cleaner as claimed in claim 1, wherein said motor fan suction unit comprises: a motor having an upstream end plate and being mounted on a spider received and located within said body portion, which said body portion is provided in two parts with the joint face between said two parts lying in a plane extending generally parallel to the axis of said motor fan suction unit; the fan of said unit is of the centrifugal kind comprising a pair of spaced discs with arcuate webs extending therebetween, each of said arcuate webs extending from an outer periphery generally towards the center with an upstream one of said pair of discs having a central aperture therein for air inlet, and wherein said downstream one of said pair of discs bears, on its downstream face, ribs which cause flow of a current of air onto an upstream end plate of the motor of said unit, which said upstream end plate is apertured to enable the air flow to pass through said motor and out of apertures adjacent the downstream end of said motor, said ribs comprising four linear ribs provided with their inner ends lying at the four corners of a square which has the axis of said fan at its center and the four outer ends lying at the four corners of a further square and with the said square and said further square axially rotated with respect to one another through 45 degrees.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-03-24	1989-09-23	1990-03-25	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-03-24	1993-09-23	1994-03-25	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-03-24	1997-09-23	1998-03-25	$7700.00	Window Closed / Lapsed

Rechargeable vacuum cleaner

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