A switch includes a first elastic member that is conductive and configured to contact the first signal pattern, a second elastic member that is conductive and configured to contact the second signal pattern, and a third elastic member that is conductive and configured to contact the third signal pattern. When a first pressing operation is performed for the press member so as to move the press member from an initial position in the pressing direction the first and second signal patterns are electrically connectable via the first and second elastic members. After the first pressing operation, when a second pressing operation is performed for the press member so as to move the press member in a direction opposite to the pressing direction by the first and second elastic members, the first to third signal patterns are electrically connectable via the first to third elastic members.

An electromagnetic relay includes: an excitation coil; a movable core; a movable contactor that operates by following the movable core; a fixed contactor that is in contact with the movable contactor when the excitation coil is energized; a base that supports the fixed contactor; a fixed yoke fixed to the base; a moving yoke; a first pressing spring that biases the moving yoke toward the movable contactor; and a second pressing spring that biases the movable contactor such that the movable contactor and the fixed contactor are in contact with each other. The moving yoke is disposed to be in contact with a surface of the movable contactor opposite from the fixed contactor and to oppose the fixed yoke through the movable contactor. The moving yoke is provided to be able to contact and separate from the movable contactor.

A push-button switch has a sound function and a button accepts a pushing operation. A second plunger slides in coordination with the pushing operation on the button. A torsion coil spring stores or releases elastic energy together with sliding of the second plunger. A sounder unit slides using elastic energy released by the torsion coil spring at the same time as the torsion coil spring elastically deforms, and the sounder unit generates a hitting sound by impacting a hitting piece. A movable contact piece has a movable-side contact Pm and is capable of moving due to being pushed by the sliding sounder unit. A fixed contact piece has a fixed side contact, the movable-side contact Pm being engaged with the fixed side contact at the same time or substantially at the same time as the sounder unit hits the hitting piece.

A configuration that easily generates an operation sound and opening/closing of a contact at the same time or substantially at the same time, without increasing manufacturing cost. A push-button switch s having a sound function, wherein a button 11 accepts a pushing operation. A second plunger 13 slides in coordination with the pushing operation on the button 11. A torsion coil spring 14 stores or releases elastic energy together with sliding of the second plunger 13. A sounder unit 15 slides using elastic energy released by the torsion coil spring 14 at the same time as the torsion spring 14 elastically deform, and the sounder unit 15 generates a hitting sound by impacting a hitting piece 181. A movable contact piece 16 has a movable-side contact Pm and is capable of moving due to being pushed by the sliding sounder unit 15. A fixed contact piece 17 has a fixed side contact Pf, the movable-side contact Pm being engaged with the fixed side contact Pf at the same time or substantially at the same time as the sounder unit 13 hits the hitting piece 181.

The present disclosure discloses a key unit. The key unit comprises a movable body, an elastic body, and a switch layer comprising a plurality of control switches that are arrayed, wherein along a vertical direction, one end of the elastic body is abutted against a non-central region of the movable body, the other end of the elastic body is selectively pressed against the switch layer under pressing drive of the movable body to adjust an operating state of the control switches of the switch layer. In addition, the present disclosure further provides a keyboard which employs arrays of the key units. With the keyboard unit according to the present disclosure, the quantity of elements is reduced, the structure is simplified, the assembling is facilitated, and the dust-proofing performance is improved.

An electromagnetic relay includes: an excitation coil; a movable core; a movable contactor that operates by following the movable core; a fixed contactor that is in contact with the movable contactor when the excitation coil is energized; a base that supports the fixed contactor; a fixed yoke fixed to the base; a moving yoke; a first pressing spring that biases the moving yoke toward the movable contactor; and a second pressing spring that biases the movable contactor such that the movable contactor and the fixed contactor are in contact with each other. The moving yoke is disposed to be in contact with a surface of the movable contactor opposite from the fixed contactor and to oppose the fixed yoke through the movable contactor. The moving yoke is provided to be able to contact and separate from the movable contactor.

A switch includes a first elastic member that is conductive and configured to contact the first signal pattern, a second elastic member that is conductive and configured to contact the second signal pattern, and a third elastic member that is conductive and configured to contact the third signal pattern. When a first pressing operation is performed for the press member so as to move the press member from an initial position in the pressing direction the first and second signal patterns are electrically connectable via the first and second elastic members. After the first pressing operation, when a second pressing operation is performed for the press member so as to move the press member in a direction opposite to the pressing direction by the first and second elastic members, the first to third signal patterns are electrically connectable via the first to third elastic members.

An energy storage operation mechanism for a circuit breaker comprises a side plate assembly, a connecting rod assembly, a cam assembly, an energy storage assembly, a rotating shaft assembly and a control assembly. A rotatable driving shaft is mounted in the side plate assembly. The connecting rod assembly and the cam assembly are mounted on the driving shaft. The energy storage assembly and the rotating shaft assembly are mounted at one side of the driving shaft, and the control assembly is mounted at the other side of the driving shaft. The connecting rod assembly is connected with the rotating shaft assembly. The cam assembly can be in contact and connection with the energy storage assembly to push the energy storage assembly to store energy. The control assembly can be connected with the connecting rod assembly and the cam assembly in a latching manner. The energy storage operation mechanism for the circuit breaker, which is provided by the present invention, is compact in structure and high in reliability.

An input device includes an operation member vertically movably disposed on a support, urging means for urging the operation member upward, and an inclination preventive member reducing inclination of the operation member by coupling first and second ends of the operation member in a first horizontal direction and linking vertical movements of the first and second ends together. The inclination preventive member includes a main shaft extending in the first horizontal direction and rotatably and axially supported by the support, a pair of arms extending from opposite ends of the main shaft toward an identical side of a second horizontal direction crossing the first horizontal direction, and a pair of secondary shafts extending in the first horizontal direction from distal ends of the pair of arms, and rotatably and axially supported by the first and second ends. The pair of arms include short and long arms.

An emergency stop device including a control button, an actuation assembly which includes an actuation plunger that cooperates with the control button and an actuation spring mounted between the body of the device and the actuation plunger, a trip plunger designed to cooperate with at least one electrical contact unit and one trip spring mounted between the actuation plunger and the trip plunger and arranged to actuate the trip plunger when the control button is actuated from its rest position to its actuated position, a latching member mounted on the trip plunger, an unlocking assembly including an unlocking ring that is arranged to cooperate with the control button to return it from its released actuated position to the rest position, the unlocking assembly including an unlocking spring mounted between the control button and the body, and arranged to actuate the control button towards its rest position.