Supports – Machinery support – Movable machine
Patent
1985-07-22
1987-09-15
Foss, J. Franklin
Supports
Machinery support
Movable machine
248 1, 248665, 248456, 248439, 108 7, 400682, A47F 512
Patent
active
046934448
ABSTRACT:
A height adjust mechanism which may be advantageously used to set a keyboard to a predetermined number of angles with respect to a support surface upon which the keyboard sits. The apparatus is integral with the keyboard base and includes an adjustment foot member having a ratchet surface with four detents therein. The foot member is pivotally mounted within the keyboard base and extends downward through a hole in the keyboard base. An adjustment lever is also pivotally mounted within the keyboard base and includes a pawl which engages one of the detents of the adjustment foot member. A single spring is connected to the adjustment foot and to the adjustment lever. This spring biases the adjustment foot in a downward direction, while at the same time biasing the adjustment lever so that the pawl positively engages one of the detents of the ratchet surface. This apparatus is capable of lifting the back of a keyboard by a distance which is greater than the vertical distance which the apparatus consumes inside the keyboard base.
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patent: 1836053 (1931-12-01), Wagner
patent: 4402624 (1983-09-01), Stahl
patent: 4421035 (1983-12-01), Gubbe
patent: 4527149 (1985-07-01), Swensen
Greenfield, J., "Keyboard Assembly", IBM Technical Disclosure Bulletin, vol. 25, No. 8, Jan., 1983, pp. 4265-4267.
Kelley, T. F., "Keyboard-Angle Adjustment", IBM Technical Disclosure Bulletin, vol. 24, No. 12, May, 1982, p. 6556.
"Keyboard Tilt Mechanism", IBM Technical Disclosure Bulletin, vol. 27, No. 10B, Mar., 1985, pp. 6100-6102.
Allen, D., "Dual Tilt Support Legs for Keypad", IBM Technical Disclosure Bulletin, vol. 26, No. 7A, Dec., 1983, pp. 3277-3278.
Frank, E. H., "Adjustable Keyboard Mechanism", IBM Technical Disclosure Bulletin, vol. 25, No. 4, Sep., 1982, pp. 1978-1979.
Thomas Michael D.
Williams Glenn T.
Foss J. Franklin
Intergraph Corporation
Olson Robert A.
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