Patent ID: 7828489

Claim:
A computer keyboard comprising: two keyboard assemblies, each including a base member having an upper portion and being configured to be supported by a structure, each keyboard assembly further including: a keying module having a lower portion configured to be positionable adjacent the upper portion of the base member, and an upper portion configured to operatively retain a plurality of keys thereon, each keying module extending with respect to the user between proximal and distal ends, and between inner and outer lateral edges, and being pivotably coupled to the base member toward the outer lateral edge such that the inner lateral edge of the keying module is pivotable away from the base member; and a single unitary and rigid lifting flange positioned between the base member and the keying module, a first edge of the lifting flange being pivotably coupled to a central portion of the base member, the lifting flange directly accessible by a user to be pivoted about a pivot axis, an opposing second edge of the lifting flange having at least one protrusion, the keying module having at least three slots arranged in a series, the protrusion and each slot being sized and shaped such that the protrusion releasably engages the slot, the protrusion wedging against the slot in response to a weight of the keying module to securely retain the lifting flange in a raised orientation in which the inner lateral edge of the keying module is spaced at an angle away from the base member, lifting the keying module releasing the protrusion from the slot, each slot being positioned with respect to the pivot axis such that the lifting flange rigidly supports the keying module at a corresponding distinct angle when the protrusion is inserted in the respective slots, the corresponding distinct angle of the keying module while the protrusion is in a first slot being at least 5 degrees different from the corresponding distinct angle of the keying module while the protrusion is in each of a second slot and a third slot.