Motor vehicles – Special driving device – Stepper
Patent
1981-11-05
1984-02-21
Peters, Jr., Joseph F.
Motor vehicles
Special driving device
Stepper
180 8F, 180DIG3, 280 522, 280 61, 280242WC, 280DIG10, B62D 5702
Patent
active
044324251
ABSTRACT:
A mechanism is described for the transport of an object across relatively level surfaces as well as to ascend and descend stairways. This mechanism is provided with a frame and a pair of wheels on each side of the frame for supporting the same above a surface. Furthermore, a climbing chain with lugs is associated with each wheel on the frame; these chains being inclined at an angle from the level to approximate the average pitch of stairs to be encountered. At least one of each of the wheels on each side of the frame is provided with mechanism for raising or lowering the same whereby the frame is maintained in a level orientation during ascent or descent of the stairs.
The mechanism is described particularly with respect to a wheel chair for handicapped persons. Two principal embodiments are disclosed: one in which the wheel chair is powered by the occupant; and the other wherein the wheel chair is powered by electrical or other corresponding power means. Appropriate sensing means are provided on the frame to ascertain a nonlevel condition in pitch or yaw whereby corrections can be made in the driving means such that a level orientation is re-established. Through the use of an appropriate gearing, braking mechanism is provided whereby an interruption of the driving power, either in the form of the occupant or a motor, holds the climbing chains in their current position whereby the occupant is not subjected to a dangerous situation. Some specific embodiments of drive trains and climbing chains are described for illustration purposes.
REFERENCES:
patent: 705731 (1902-07-01), Ach
patent: 2319008 (1943-05-01), McCormack
patent: 2751027 (1956-06-01), McLaughlin
patent: 3104112 (1963-09-01), Crail
patent: 3169596 (1965-02-01), Wright
patent: 3226128 (1965-12-01), Grier, Jr.
patent: 3292722 (1966-12-01), Bamberg
patent: 3304094 (1967-02-01), Wenger
patent: 3529688 (1970-09-01), Bruce
Peters Jr. Joseph F.
Rice Kenneth R.
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