Typewriting machines – Key-board or key lever-actuating mechanism – Key-cap or key-stem structure
Patent
1991-05-23
1992-12-22
Burr, Edgar S.
Typewriting machines
Key-board or key lever-actuating mechanism
Key-cap or key-stem structure
4004931, 400494, 400495, 200341, 200345, B41J 512, H01H 312, H01H 1370
Patent
active
051729903
ABSTRACT:
The improved structures of the push-button key of keyboard are characterized in that the upper housing panel of keyboard comprises a plurality of partitioned sections where the push-button keys are installed, and that a key barrel of a predetermined height is set up at the center of each of the partitioned sections. The barrel wall comprises two slide keys positioned correspondingly to two slide key seats of the push-button key. The hooking means are arranged in the partitioned section at a predetermined distance from the key barrel. The stability of up-and-down movement of the push-button key is ensured by virtue of a coordinated action of slide key and slide key seats. The hooking means serve to confine the movement of the push-button key and to prevent the push-button key from being detached easily. The push-button key is further improved structurally in such manners that the face plate and the bottom portion of the key are of different colors and that the face plate comprises holes of various shapes conforming to the shapes of the designated letters or the Arabic numerals. Therefore, the letters, words, or Arabic numerals appeared on the surfaces of the keys do not become obscure after a prolonged usage thereof.
REFERENCES:
patent: 4556769 (1985-12-01), Inaba
patent: 4656078 (1987-04-01), Goto et al.
patent: 4827243 (1989-05-01), Cheng
patent: 4918271 (1990-04-01), Deeg
IBM Technical Disclosure Bulletin, pp. 408-411, vol. 30, No. 1, Jun. 1987.
Burr Edgar S.
Cal-Comp Electronics Inc.
Hendrickson Lynn D.
LandOfFree
Structures of push - button key of keyboard does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Structures of push - button key of keyboard, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Structures of push - button key of keyboard will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-972023