The present invention relates to a keyboard, including a base plate, a connecting element, a keycap, and a hook. The connecting element is separately connected to the hook and the base plate. The hook is disposed on an inner surface of the keycap and is connected to a connecting shaft of the connecting element. The hook includes a first fixing portion and a second fixing portion. The first fixing portion is in contact with a first side of the connecting shaft, and the second fixing portion is in contact with a second side of the connecting shaft. The structure of the second fixing portion in the hook is stronger than the structure of the first fixing portion, so that when the connecting shaft is applied with a force to be out of the hook, the first fixing portion is applied with an interference force to be broken, thereby having a recognizing effect.

A keyboard device includes a key frame. The key frame includes a main body and a receiving hole. The receiving hole runs through the main body along a vertical direction. A keycap is movable within the receiving hole. The main body includes a first substrate layer, a second substrate layer and a contact layer. The first substrate layer and the second substrate layer are staked along the vertical direction. The contact layer is arranged between the first substrate layer and the second substrate layer. The second substrate layer is combined with the first substrate layer through the contact layer. The first substrate layer is made of a first material. The second substrate layer is made of a second material. The hardness of the second material is lower than the hardness of the first material.

A base element and at least one switching element are included in an operator control device which may be disposed in a vehicle. By closing at least one electrical contact, the switching element is moveable from a first position into a second position relative to the base element. The operator control device can also include at least one pushbutton switch moveable relative to the base element between a position of rest and at least one activation position. The operator control device can further include at least one restoring element, formed of silicone and supported on the base element and on the pushbutton switch, which can be elastically deformed by moving the pushbutton switch from the position of rest into the activation position. Using the restoring element, the pushbutton switch can be moved from the activation position into the position of rest by relaxing the restoring element.

A composite elastomeric structure comprises an elastic body comprising a top structure and a ring side wall structure and a transmitting column comprising an outer shell structure and an inner core structure. The transmitting column is connected to the top structure and is located below the top structure in a substantially central position. The ring side wall structure is connected to the top structure and surrounds the transmitting column and is located below the top structure. The outer shell structure comprises a material having a first hardness and the inner core structure comprises a material having a second hardness. The first hardness is smaller than the second hardness.

A rubber stem for use in a switch apparatus having a dome-shaped invertible spring includes an operating portion on which a pressing action is performed, a skirt surrounding the operating portion and configured to be deformed in response to the pressing action performed on the operating portion, a base extending annularly along a lower edge of the skirt and supporting the lower edge of the skirt, and a pressing portion provided on a back side of the operating portion at a position facing a top of the invertible spring and configured to press the top of the invertible spring in response to the pressing action performed on the operating portion, wherein the skirt is formed of a low-hardness elastic material, and at least a part of the rubber stem other than the skirt is formed of a high-hardness elastic material.