Vacuum cleaner counter-balance mechanism

Details Vacuum cleaner counter-balance mechanism Vacuum cleaner counter-balance mechanism

2007-12-25

2007-12-25

Snider, Theresa T. (Department: 1744)

Brushing, scrubbing, and general cleaning

Machines

With air blast or suction

C015S339000

Reexamination Certificate

active

10888160

ABSTRACT:
A vacuum cleaner is provided having a cleaning head and a main body pivotally mounted to the cleaning head which includes a counter-balance mechanism having at least one torsion spring with a first end thereof mounted for pivotal movement about a fixed axis in either the cleaning head or the main body and a second end thereof mounted for pivotal movement about a fixed axis in the other of the cleaning head or the main body, with the at least one torsion spring having a main body portion which is free to move as the main body of the vacuum cleaner is pivoted relative to the cleaning head, the counter-balancing force of the at least one torsion spring increasing as the main body of the vacuum cleaner is pivoted from a generally vertical position to a generally horizontal position while the cleaning head remains generally horizontal.

REFERENCES:
patent: 1937765 (1933-12-01), Leathers
patent: 2218163 (1940-10-01), Carlson
patent: 2226362 (1940-12-01), White
patent: 2243066 (1941-05-01), Becker
patent: 2291250 (1942-07-01), Nielsen et al.
patent: 2525282 (1950-10-01), Brace
patent: 2671924 (1954-03-01), Segesman
patent: 2684271 (1954-07-01), Brace
patent: 3154802 (1964-11-01), Hanschitz et al.
patent: 3188681 (1965-06-01), Jepson et al.
patent: 5353471 (1994-10-01), Gühne et al.
patent: 6286181 (2001-09-01), Kasper et al.
patent: 6772474 (2004-08-01), Nishikori et al.

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