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This article describes a keyboard shift-lock device that can be fitted to the keyboard of a typewriter or computer. It enables a user to keep a key held down or released with a single stroke.
English (United States)
This text was extracted from a PDF file.
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100% of the total text.
Page 1 of 2
Keyboard Shift-Lock Device
This article describes a keyboard shift-lock device that can be fitted to the
keyboard of a typewriter or computer. It enables a user to keep a key held down
or released with a single stroke.
Normally, a keyboard is in 'shifted' mode while a shift key is held down and
returns to 'normal (released)'mode when the key is released. The device
changes this mechanism. The shift key is held down by a mechanical part fitted
to it, so it is locked in 'shifted' mode.
The device consists of three parts: a mechanical part, a vise part, and an arm
part (Fig. 1). The mechanical part is fixed to the shift key. At the top of this part
there is a button. A pin under the part projects and retracts alternately when the
button is pressed (Fig. 2). The vise part fixes the whole device to the keyboard or
desk. The arm part connects the mechanical part and the vice part. The arm
part's flexible joint allows the mechanical part to be placed in the proper position
on the shift key (Fig. 3).
The pin projects when the button is pressed. It holds down the shift key, and
the keyboard is locked into 'shifted' mode. When the button is pressed again, the
pin retracts, and the keyboard returns to 'normal' mode.
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