Typewriting machines – Key-board or key lever-actuating mechanism – Key-cap or key-stem structure
Patent
1998-08-24
1999-09-07
Burr, Edgar
Typewriting machines
Key-board or key lever-actuating mechanism
Key-cap or key-stem structure
200344, 4914951, B41J 508, H01H 1370
Patent
active
059476168
ABSTRACT:
An improved key structure for computer keyboards includes two crossed support frames that, after pivotal connection, have center limiting rods projecting respectively from outer sides of the connecting position. Left and right slide rods respectively project from both sides of a horizontal rod at a bottom end of the two crossed support frames, with an inverted U-shaped groove disposed at a middle section and straddling on the limiting plates of the corresponding key base so that when the crossed support frames are compressed and lie down in a closed state, they will not deviate. Two opposite slide bars that orient inwardly are provided on upper ends of the crossed support frames. Four slide holes are respectively provided on a bottom face of a key unit corresponding to the slide bars so that the slide bars can be positioned in the four slide holes and cause the two crossed frames to lie flat. Furthermore, four L-shaped slide seats are provided on the key base of the base plate corresponding to the left and right slide rods on the two crossed support frames so that the left and right slide rods may just insert into the slide holes to perform left and right displacements. Vertical slide tracks are provided on the key base corresponding to the two center limiting rods of the two crossed support frames so that the center limiting rods are limited by the slide tracks on both sides thereof. An elastic silicon rubber is provided to urge upwardly against the key unit. When the key unit is pressed, upward and downward vertical movement of the key unit is ensured to avoid slanting or deviation. Since the slide rods and slide bars are located in the thickness range of the keyboard base, and the four slide holes will partly go deep into the key base when the key is pressed to its limit, the height between the key and the base plate can be reduced to decrease the overall thickness of the keyboard.
REFERENCES:
patent: 5278372 (1994-01-01), Takagi et al.
patent: 5747758 (1998-05-01), Hochgesang et al.
patent: 5763842 (1998-06-01), Tsai et al.
patent: 5819914 (1998-10-01), Yoneyama
patent: 5829579 (1998-11-01), Tsai
patent: 5842798 (1998-12-01), Su
patent: 5878872 (1999-03-01), Tsai
Burr Edgar
Sandusky Amanda B.
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