Typewriting machines – Key-board or key lever-actuating mechanism – Key-board including keys grouped to facilitate positioning...
Patent
1992-01-27
1992-08-11
Burr, Edgar S.
Typewriting machines
Key-board or key lever-actuating mechanism
Key-board including keys grouped to facilitate positioning...
400 82, 400682, 400715, B41J 510
Patent
active
051373840
ABSTRACT:
Conceived with the human-engineering objective of overcoming Repetitive Motion Injuries such as Carpal Tunnel Syndrome. The solution, a system comprising a split-keyboard spaced laterally into vertically arranged co-operative keypad halves, optimally enabling the user to sit with the lightweight portable keyboard assembly laying directly upon their lap. Traditional keyboards orient operator's hands inducing a wrist-twisting, arm-extending stress while the stress-free ergonomic bodily position herein liberates one from such trauma by reorientation of the hands and arms to a non-pronated, unextended position. This correction involves the upper-arm draping naturally down from the shoulder with the forearm, set at a relaxed forward projecting right-angle, placing the Carpal-ligaments of one's wrists in a non-torqued, neutral position. Because weight of the extended hand/forearm is borne comfortably upon the narrow side (hypothenar-eminence) of the hand, this newly identified reorientation requires no appreciable musculature effort to maintain. The arrangement of keypad controls, with transverse adjustability to user's physique, serves to ameliorate onset occurrence of keyboard associated RMI-diseases. Utilizing visual-reference mirrors adjustable to a user's eye, enables them to readily reference any key-indicia or tracking-mouse hemisphere via convenience of natural mirror-image/reverse-compensated character notation. The system universally interfaces with ordinary electronic keyboard connections, and employs a conventional (albeit split) Qwerty keyboard. It is likewise adaptable to other keyboard formats. Optional accommodation of an Accounting-panel (ten-key; with affixed visual-reference mirror) at the right or left of the keyboard-base, is achieved via a modularly invertible attachment upon either laterally extensile retractable-support member.
REFERENCES:
patent: 3305062 (1965-04-01), Kihredge
patent: 3990565 (1974-08-01), Felton
patent: 4661005 (1984-01-01), Lahr
patent: 5067834 (1991-11-01), Szmanda et al.
Albert Stephen L.
Spencer Jeffery B.
Burr Edgar S.
Yan Ren
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