Patent · US Active

Counterbalance assembly for a fold out ramp

US7533434B2 · kind B2 · utility

38Cited by

35References

20Claims

0Family size

Assignee

Lift-U, Division of Hogan Mfg., Inc. · US

Inventors

Donald Morris · Littleton, US
David Johnson · Modesto, US

Key dates

Filing date	Oct 21, 2008
Grant date	May 19, 2009
Priority date	—
Expiry date	Oct 21, 2028

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T403/32254
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

A counterbalance for a ramp assembly includes a chain assembly and a spring assembly. The spring assembly includes a spring and first and second spring fittings. The first spring fitting restrains a first end of the spring when the ramp portion is between a neutral position and the stowed position and moves the first end of the spring toward a second end of the spring when the ramp portion moves from the neutral position toward the deployed position. The second spring fitting is spaced from the first spring fitting and restrains the second end of the spring when the ramp portion is between the neutral position and the deployed position. The second spring fitting moves the second end of the spring toward the first end of the spring when the ramp portion moves from the neutral position toward the stowed position.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.