A cable pull switch includes a polychotomous sensor configured to provide a reading of at least one of a plurality of values, the reading corresponding to a tension on a pull cable or a linear displacement of an end of a pull cable. A processor coupled to the polychotomous cable pull sensor configured to determine a rate of change of the value of the reading from the sensor and determine an occurrence of a cable pull event, the determination based on the determined rate of change of the value, and determine whether the rate of change of the value of an electrical resistance through the polychotomous cable pull sensor is below a threshold rate of change value, and adjust an upper pull threshold value to a new upper pull threshold value that is based on a present reading of the value of the electrical resistance through the strain gauge.

A switch device includes an operation switch including a switch knob formed integrally with a recess configured to allow a finger to be inserted. The operation switch includes a detector configured to detect a change in a physical amount caused by operation of the switch knob.

A transmitter device incorporating a strain gauge proportional push button is disclosed. The transmitter device includes a printed circuit board including one or more electrical components thereon and a proportional push button having a flexible membrane, a dome switch positioned beneath the flexible membrane and attached to the printed circuit board, the dome switch being proximate to the flexible membrane such that depression of the flexible membrane causes the dome switch to snap down and thereby form a closed circuit in the dome switch, and a strain gauge formed on or applied to the printed circuit board and positioned adjacent the dome switch, the strain gauge generating an electrical output proportional to an amount of deflection of the printed circuit board caused by pressure exerted thereon by depression of the flexible membrane and the dome switch.

A cable pull switch includes a polychotomous sensor configured to provide a reading of at least one of a plurality of values, the reading corresponding to a tension on a pull cable or a linear displacement of an end of a pull cable. A processor coupled to the polychotomous cable pull sensor configured to determine a rate of change of the value of the reading from the sensor and determine an occurrence of a cable pull event, the determination based on the determined rate of change of the value, and determine whether the rate of change of the value of an electrical resistance through the polychotomous cable pull sensor is below a threshold rate of change value, and adjust an upper pull threshold value to a new upper pull threshold value that is based on a present reading of the value of the electrical resistance through the strain gauge.

A cable pull switch includes a polychotomous sensor configured to provide a reading of at least one of a plurality of values, the reading corresponding to a tension on a pull cable or a linear displacement of an end of a pull cable. A processor coupled to the polychotomous cable pull sensor configured to determine a rate of change of the value of the reading from the sensor and determine an occurrence of a cable pull event, the determination based on the determined rate of change of the value, and determine whether the rate of change of the value of an electrical resistance through the polychotomous cable pull sensor is below a threshold rate of change value, and adjust an upper pull threshold value to a new upper pull threshold value that is based on a present reading of the value of the electrical resistance through the strain gauge.

A key structure may include a lower shell inserted into an insertion opening, where an annular stopper protrudes from the lower shell, which may include transparent grooves arranged on opposite inner sides of the annular stopper, the annular stopper may be formed with elastic arms on outer sides of the grooves, clamping hooks engaged with the top plate extend downwardly from the elastic arms, the annular stopper, and the annular stopper and a top plate stop and locate each other. The key structure may include an upper shell above the lower shell, that may include a through opening. The key structure may include a pressing shaft movably disposed between the lower shell and the upper shell, where a top end of the pressing shaft penetrates the through insertion opening. Moreover, the key structure may include a spring disposed and elastically supported between the lower shell and the pressing shaft.

A transmitter device incorporating a strain gauge proportional push button is disclosed. The transmitter device includes a printed circuit board including one or more electrical components thereon and a proportional push button having a flexible membrane, a dome switch positioned beneath the flexible membrane and attached to the printed circuit board, the dome switch being proximate to the flexible membrane such that depression of the flexible membrane causes the dome switch to snap down and thereby form a closed circuit in the dome switch, and a strain gauge formed on or applied to the printed circuit board and positioned adjacent the dome switch, the strain gauge generating an electrical output proportional to an amount of deflection of the printed circuit board caused by pressure exerted thereon by depression of the flexible membrane and the dome switch.

A keyboard switch includes a base (1), a resistance-type pressure sensor (5) installed on the base (1), a spring (3) arranged in the base (1) and capable of being pressed on the resistance-type pressure sensor (5), a button (4) which presses the spring (3) and is in sliding fit with the base (1), and an upper cover (2) which presses the button (4) and is adaptive to the base (1). The resistance-type pressure sensor (5) includes two terminals (53) and an elastic sensitive element (51), the elastic sensitive element (51) being internally provided with a resistance strain gauge (52), and two leads (54) extending outwards from the resistance strain gauge (52); one ends of the two terminals (53) are respectively connected to the two leads (54), and the other ends of the two terminals (53) are separately connected to a PCB (6).

A pivot supporting structure for a circuit breaker and a circuit breaker. The pivot supporting structure includes: a supporting body having a supporting hole for receiving and pivotally supporting a pivot pin connected to an actuating mechanism of the circuit breaker, wherein at least one strain gauge are mounted to the supporting body for sensing the force acting on the pivot supporting structure by the actuating mechanism. This pivot supporting structure can accurately sense the characteristic force applied, such that the contact force and mechanical characteristics of the circuit breaker can be on-line monitored.

A transmitter device incorporating a strain gauge proportional push button is disclosed. The transmitter device includes a printed circuit board including one or more electrical components thereon and a proportional push button having a flexible membrane, a dome switch positioned beneath the flexible membrane and attached to the printed circuit board, the dome switch being proximate to the flexible membrane such that depression of the flexible membrane causes the dome switch to snap down and thereby form a closed circuit in the dome switch, and a strain gauge formed on or applied to the printed circuit board and positioned adjacent the dome switch, the strain gauge generating an electrical output proportional to an amount of deflection of the printed circuit board caused by pressure exerted thereon by depression of the flexible membrane and the dome switch.