Supports – Stand – Adjustable vertically
Patent
1992-07-14
1994-02-15
Ramirez, Ramon O.
Supports
Stand
Adjustable vertically
108147, 29742345, F16M 1300
Patent
active
052859924
ABSTRACT:
The present invention is an adjustable step stool. The step stool comprises a telescopic body which vertically expands and contracts through the actuation of a scissor assembly disposed therein. The scissor assembly includes a plurality of knee brackets pivotally joining a pair of cross bars and screw blocks. A threaded actuating rod is journaled through one screw block and is threaded through the other screw block. As the rod is rotated, the screw blocks either converge or diverge from one another acting on the knee brackets which, in turn, cause the cross bars to raise or lower, respectively. The rod is driven by an electric motor. The motor is made operable to raise and lower the step stool through the control of a pair of switches. For hands-free, relatively effortless control of the step stool, the switches are disposed beneath yet accessible through an anti-slip mat positioned on the upper surface of the top section. In the event that the motor fails to operate, that is, fails to actuate the rod, the step stool is provided with a hand crank which permits a user to raise and lower the step stool manually. Handles are provided to assist in the transportation of the stool. Anti-skid feet are employed to reduce the risk of the stool moving inadvertently.
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Air-Lift Publication, Dec. 1972.
Litman Richard C.
Ramirez Ramon O.
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