A key able to accept a label for a keypad used in controlling electrically operated devices, wherein the key structure accepts and secures an interchangeable label, and which forms an impermeable barrier to the electrical contacts of a programmable circuit board.

A display cover apparatus having a display cover for a push button on a push button switch, a holder for the display cover, and a housing. The display cover has lock hooks and the holder has a hollow interior, a top end with lock slots that removably connect to the lock hooks, a bottom end, a flexible retaining washer in a groove at the bottom end, and a locking key between the top end and the bottom end. The holder is positioned on a circular shelf in an interior of the housing. The circular shelf has an internal circular flange with a locking slot that receives the locking key to prevent rotation of the holder in the housing. The flexible retaining washer is positioned beneath the flange. The circular shelf and the flexible retaining washer prevent linear movement of the holder in the housing. An alignment hook on the display cover removably connects to an alignment slot on the holder, thereby preventing the display cover from rotating on the holder.

A detachable screen key structure mainly includes a key body having a hollow portion, key butting element and screen carrying element, where a key signal connecter is configured in the hollow portion, the screen carrying element is configured with a display element and a key cap is configured on the display element, and the display element is configured with a display butting element adapted to dock the key butting element. Whereby, a user can accommodate the key signal connecter for signal transmission inside the hollow portion so as to increase use beautification. Furthermore, since the display will be connected to the key butting element through the display butting element, the user is allowed to carry out the removal and replacement by themselves, which can increase use convenience.

A detachable screen key structure mainly includes a key body having a hollow portion, key butting element and screen carrying element, where a key signal connecter is configured in the hollow portion, the screen carrying element is configured with a display element and a key cap is configured on the display element, and the display element is configured with a display butting element adapted to dock the key butting element. Whereby, a user can accommodate the key signal connecter for signal transmission inside the hollow portion so as to increase use beautification. Furthermore, since the display will be connected to the key butting element through the display butting element, the user is allowed to carry out the removal and replacement by themselves, which can increase use convenience.

A display cover apparatus having a display cover for a push button on a push button switch, a holder for the display cover, and a housing. The display cover has lock hooks and the holder has a hollow interior, a top end with lock slots that reversibly connect to the lock hooks, a bottom end, a flexible retaining washer in a groove at the bottom end, and a locking key between the top end and the bottom end. The holder is positioned on a circular shelf in an interior of the housing. The circular shelf has an internal circular flange with a locking slot that receives the locking key to prevent rotation of the holder in the housing. The flexible retaining washer is positioned beneath the flange. The circular shelf and the flexible retaining washer prevent linear movement of the holder in the housing. An alignment hook on the display cover reversibly connects to an alignment slot on the holder, thereby preventing the display cover from rotating on the holder.

A key able to accept a label for a keypad used in controlling electrically operated devices, wherein the key structure accepts and secures an interchangeable label, and which forms an impermeable barrier to the electrical contacts of a programmable circuit board.

A key able to accept a label for a keypad used in controlling electrically operated devices, wherein the key structure accepts and secures an interchangeable label, and which forms an impermeable barrier to the electrical contacts of a programmable circuit board.

A key able to accept a label for a keypad used in controlling electrically operated devices, wherein the key structure accepts and secures an interchangeable label, and which forms an impermeable barrier to the electrical contacts of a programmable circuit board.

The present invention provides a keycap, which includes a lower plate and an upper cover. The lower plate has at least two engaging holes recessed inwardly from an upper surface of the lower plate and separated from each other. The upper cover is configured to be detachably assembled on the lower plate, in which the upper cover has at least two buckle members disposed on an inner top surface of the upper cover and respectively corresponding to the at least two engaging holes, and each of the buckle members has two buckle portions separated from each other, and each of the buckle portions has a protrusion protruding laterally outward, and each of the protrusions is configured to engage with a portion of the corresponding engaging hole.