# US 4,392,271 A · Electric vacuum cleaner with window for viewing belt

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- Number: US 4,392,271 A
- Document ID: US4392271A
- Status: Granted
- Kind: A
- Application number: 06/303,715
- Filed: 1981-09-21
- Granted: 1983-07-12
- Earliest claimed: 1981-09-21
- Assignees: National Union Electric Corporation
- Inventors: Arnold L. Sepke
- Web page: https://patentgrep.com/patent/US4392271A

## CPC

- A47L 9/0411: {driven by electric motor}
- A47L 9/00: Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L 9/0444: {for conveying motion by endless flexible members, e.g. belts}
- A47L: DOMESTIC WASHING OR CLEANING (brushes A46B; cleaning quantities of bottles or of other hollow articles of one kind B08B9/00; laundry D06F); SUCTION CLEANERS IN GENERAL (cleaning in general B08)

## Abstract

An electric vacuum cleaner has a generally opaque housing enclosing a bruch roller rotatable about a horizontal axis, a motor, and a belt or the like extending from the motor to a pulley on or affixed to the brush roller, for driving the brush roller. A transparent window is provided in the top of the housing and aligned with the belt, and highly contrasting markings are provided on the belt, thereby to enable an operator to determine, viewing the belt through the window, the moving condition of the belt.

## Claims

### Claim 1

In a vacuum cleaner having a housing enclosing at least upwardly a beater brush rotatable about a horizontal axis, a motor, and a belt transmitting rotary motion from said motor to said beater brush; the improvement wherein said housing is opaque for the greater part thereof, and has a transparent window fixedly mounted therein to enable a portion of said belt to be viewed from externally of said housing, said belt having distinctive markings thereon, whereby its speed of movement or lack of movement, and regularity of movement, can be observed through said window.

### Claim 2 (depends on 1)

The vacuum cleaner of claim 1 wherein said motor is an electric motor having a horizontal axis, and said belt is positioned to drive the end of said beater brush.

### Claim 3 (depends on 2)

The vacuum cleaner of claim 2 wherein said window is positioned inside the housing above at least a portion of said belt.

### Claim 4 (depends on 1)

The vacuum cleaner of claim 1 wherein said motor is an electric motor having a horizontal axis parallel to the axis of said beater brush, said belt being positioned to drive an end of said beater brush, said housing having a substantially horizontal portion above said belt, said window being mounted in said horizontal portion and extending therealong to enable viewing of a substantial portion of said belt.

### Claim 5 (depends on 4)

The vacuum cleaner of claim 4 wherein said horizontal portion of said housing has a rectangular aperture, said window comprising a transparent plastic sheet having a rectangular portion fit within said aperture.

### Claim 6 (depends on 5)

The vacuum cleaner of claim 5 wherein said sheet has a flanged edge surface engaging and affixed to the underside of said horizontal portion of said housing.

### Claim 7 (depends on 4)

The vacuum cleaner of claim 4 wherein said distinctive markings are provided in alternate regions of said belt.

### Claim 8 (depends on 1)

The vacuum cleaner of claim 1 wherein said belt engages said beater brush centrally, said housing having a substantially horizontal portion above the central portion of said beater brush, said window being fixedly mounted in said horizontal portion of said housing.