Height adjustment system for vacuum cleaner
US5269042A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 1992 |
| Grant date | Dec 14, 1993 |
| Priority date | — |
| Expiry date | Jan 10, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47L5/34
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A height adjustment system for an upright vacuum cleaner comprises a cam member with a cam surface. The cam member is mounted within a base and includes rollers which facilitate the sliding lateral movement of the cam member within the base. The rollers roll within a channel within the base. Notches are formed in the side walls of the channel and receive a resiliently deformable indexing member which locates and fixes a cam follower at discrete points along the cam surface. A secondary height adjustment system comprises a ledge located on a housing which is attached to a handle. When the handle of the vacuum cleaner is rotated from a use position to an upright locked position, the ledge on the housing displaces a finger which pushes against a fulcrum plate attached to an axle connected to the front wheels of the vacuum cleaner. When the axle is so displaced, the front wheels swing downwardly, thereby raising the rotating brush above the floor surface so that the floor surface to be cleaned is not damaged while the vacuum remains stationary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.