Typewriting machines – Means auxiliary to typewriting function – Attachment for shielding or screening record-medium or...
Patent
1994-03-22
1994-12-06
Burr, Edgar S.
Typewriting machines
Means auxiliary to typewriting function
Attachment for shielding or screening record-medium or...
400714, 3122083, 3122084, B41J 2912
Patent
active
053704681
ABSTRACT:
A dust cover assembly for a computer keyboard includes a shell body which is attached to a longitudinal side of the keyboard. A slit is longitudinally formed on a peripheral upperside of the shell body. A hollow spindle is rotatably mounted in the shell body. A plug is fitted in a first end of the spindle. A flexible screen has a first end attached to the spindle and has a distal end with an elongated slat mounted thereon. A first cap member is attached to a first end of the shell body. A rod has a first end securely fitted in the first cap member and has a second end mounted in the spindle through the plug. A torsional spring is rotatably mounted around the rod and has a first end securely attached to the plug to rotate therewith and a second end fixed to the second end of the rod. A second hollow cap member is attached to a second end of the shell body and has a slot formed in an upper side thereof. A ratchet gear is received in the second cap member and is engaged with a second end of the spindle to rotate therewith. A switch device is slidably engaged on the second cap member and has a catch which is releasably engaged with the ratchet gear and is restricted to slide along the slot between a first position where the catch is in contact with the ratchet gear, whereby the ratchet gear is limited to rotate in one direction only, and a second position where the ratchet gear is disengaged from the catch, whereby the ratchet gear is capable of rotating in both directions freely.
REFERENCES:
patent: 2008412 (1935-07-01), Bovee et al.
patent: 3454075 (1969-07-01), Weinstein
patent: 4922980 (1990-05-01), Parker
Cheng Sheng H.
Chern Tony
Burr Edgar S.
Hendrickson Lynn D.
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