Portable controller with deadman switch

A portable controller in which a finger fitting portion is provided at least at one side edge of a back plate of a casing, and a deadman switch which is turned OFF when no pressure is applied to the finger fitting portion, is turned ON by pressing force (pressure) when the finger fitting portion is gripped, and is turned OFF when the finger fitting portion is pressed by pressing force (pressure) greater than the pressing force (pressure) when the finger fitting portion is gripped,

• wherein the deadman switch comprises a pressing plate which can be inserted into a recessed portion provided at the finger fitting portion or can be withdrawn therefrom, a shaft having shape of an offset provided at the pressing plate, a dog plate fitted over the offset portion of the shaft and having a plurality of holes at the circumferential edge of the shaft, a plurality of bosses inserted into the plurality of holes of the dog plate, a spacer in contact with the respective top portions of the bosses and fitted over the shaft, a spring provided at the shaft outer circumferential portion so that one end is supported in the state pressed onto a fixed portion provided at the shaft front end side, and the other end presses the spacer, and a three-point type limit switch attached on the back plate, and such that when the dog is engaged with the dog plate so that the limit switch is in free state, the limit switch is turned OFF, when the dog plate slightly pushes the dog, the limit switch is turned ON, and when the dog plate comes into contact with the spacer to push the dog more deeply against spring force of the spring, the limit switch is turned OFF.