Elevator – industrial lift truck – or stationary lift for vehicle – Stairway assist for individual or minor barrier lift for...
Reexamination Certificate
1999-06-22
2001-01-09
Olszewski, Robert P. (Department: 3652)
Elevator, industrial lift truck, or stationary lift for vehicle
Stairway assist for individual or minor barrier lift for...
C414S921000, C004S563100, C004S494000
Reexamination Certificate
active
06170612
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of The Invention
The present invention relates generally to hydraulic lifts for aiding disabled individuals. More particularly, the present invention relates to a hydraulic lift for aiding access to and egress from a swimming pool by a disabled individual.
2. Description of The Related Art
Hydraulic swimming pool lifts for the disabled are generally known in the art. Such lifts are conventionally constructed of a hydraulically driven piston within a cylinder which drives a seat portion from a lower position in the pool to a higher position above the pool. Typically, a 90° rotation is used to move the seat portion from the water area to the deck area. The cylinder is generally affixed to the deck surface by a simple bracket.
For safety and regulatory concerns it is desirable for such lifts to be able to carry and function properly with a weight three times the lift's rated capacity without permanent deformation or damage. It is common for pool lifts to be rated at four hundred pounds. Accordingly, for a lift rated at a four hundred pound capacity, it is desirable for it to function, without permanent deformation, while holding a 1,200 pound test load in all positions.
Testing reveals that many conventional lifts cannot perform adequately at three times their rated load. In fact, the performance of some lifts is questionable even at the rated capacity. When tested with a 400 pound live load, a conventional lift slowed to an unacceptable rate and required the weight to be removed in order for the lift to finish a cycle. Additionally, major structural damage even under the reduced load has been observed in testing conventional lifts. For example, the once vertical piston and cylinder bent and twisted, and were eventually displaced from the vertical by more than several degrees. During high capacity testing, the load often became unbalanced and would pull the lift out of position, creating a dangerous situation for a person in the lift, or its next occupant.
SUMMARY OF THE INVENTION
A hydraulic pool lift is disclosed. The lift has enhanced stability and adaptability due to the utilization of an adjustable support assembly, and a reinforced piston rod. The load carrying portion of the lift preferably rotates 180° in traveling from a deck loading/unloading position to a pool unloading/loading position. The deck support includes a supplemental support member disposed beneath the rotational path of the load carrying portion of the lift.
A curved track on a hydraulically driven piston guides the displacement of the load carrying portion. The track is wider in its straight portions. The wider straight portion closely approximates the width of a notch in an end cap through which the track and piston travel. This arrangement affords greater stability in the uppermost position for ease of entry into and exit from the lift portion.
It is an object of the present invention to provide a lift for access to swimming pools with improved stability that can withstand relatively high loads without loss of functionality or stability.
Other objects and advantages will be apparent to those of ordinary skill in the art from the following description of a presently preferred embodiment.
REFERENCES:
patent: 2087286 (1937-07-01), Hicks
patent: 3091778 (1963-06-01), Gross
patent: 3166282 (1965-01-01), Nolan
patent: 3286970 (1966-11-01), Nolan
patent: 3307204 (1967-03-01), Cotner
patent: 3419044 (1968-12-01), Daniels et al.
patent: 3815163 (1974-06-01), Sullivan
patent: 3918108 (1975-11-01), Feyerherm
patent: 3994030 (1976-11-01), Cassell et al.
patent: 4075719 (1978-02-01), Sullivan
patent: 4221008 (1980-09-01), Nolan
patent: 4598432 (1986-07-01), Pennington-Richards
patent: 4712788 (1987-12-01), Gaudreau, Jr.
patent: 4905327 (1990-03-01), Boublil
patent: 4941216 (1990-07-01), Boublil
patent: 4996728 (1991-03-01), Nolan
patent: 5103509 (1992-04-01), Richards
patent: 5146638 (1992-09-01), Richards
patent: 5218727 (1993-06-01), Krumbeck
patent: 5465433 (1995-11-01), Nolan
patent: 5572921 (1996-11-01), Krumbeck
Olszewski Robert P.
Spectrum Distributors, Inc.
Tran Thuy V.
Volpe and Koenig P.C.
LandOfFree
Swimming pool lift does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Swimming pool lift, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Swimming pool lift will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2499488