Motor vehicles – Special driving device – Stepper
Patent
1985-10-01
1987-06-09
Love, John J.
Motor vehicles
Special driving device
Stepper
180 82, 180 87, 180 91, 180 922, 180 928, 180 93, 180 932, 180 962, 180907, 297DIG4, B62D 5504
Patent
active
046713697
ABSTRACT:
A stair-climbing wheelchair having wheels defining a first wheel base and a pair of endless, flexible tracks providing a second wheel base, there being a motor-driven structure for moving the tracks into and out of ground-engaging positions. A first pivotal arm is pivotally mounted on the wheelchair near the front end thereof. The first arm is coupled to a fluid piston and cylinder assembly which actuates and cushions the pivotal movement of the arm as the wheelchair moves from a horizontal position to an inclined position, such as moving from the top of a stairway to the slope of the stairway as the wheelchair moves down the stairway. Similarly, a second arm coupled with a fluid piston and cylinder assembly is coupled to the wheelchair to cushion the movement of the wheelchair and its occupant as they move from an inclined position to a generally horizontal position, such as at the top of a stairway.
REFERENCES:
patent: 2012090 (1935-08-01), Straussler
patent: 3231290 (1966-01-01), Weyer
patent: 4044850 (1977-08-01), Winsor
patent: 4564080 (1986-01-01), Pagett
Tiffin Patrick J.
Watkins Baxter R.
Hill Mitchell J.
Love John J.
Rosenberg Gordon W.
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