Patent ID: 8659387

Claim:
An operation permission control device which is provided for use with a machine that has an operating means to be operated by an operator and a starting means for starting the machine in response to the operating means, and which exercises control of whether operation of the machine is permitted, comprising: a casing which is separate from the machine and which is attachable to and detachable from the machine; and a control circuit which is provided in the casing, wherein the control circuit comprises: authentication means which receives operator-part authentication data recorded on a portable recording medium from the portable recording medium, and which performs authentication processing by using the operator-part authentication data received from the portable recording medium; and opening and closing means which is configured to be inserted in a signal line in the machine for transmitting a signal that causes the starting means to operate from the operating means to the starting means, and which is configured to open and close the signal line in response to the authentication means, wherein the operation permission control device comprises a setting storage medium which is separated from the portable recording medium, and stores vehicle-part authentication data, the setting storage medium is a removable recording medium which is attachable to and detachable from the operation permission control device, the authentication means performs the authentication processing by using the operator-part authentication data and the vehicle-part authentication data only in cases where the setting storage medium is attached to the operation permission control device, the opening and closing means is configured to be inserted in the signal line via electromagnetic coupling and is configured to transmit the signal using the electromagnetic coupling, the electromagnetic coupling is realized by a first electromagnetic coupling of a first coil prepared in the operation means and a second coil prepared in the opening and closing means, and a second electromagnetic coupling of a third coil prepared in the opening and closing means and a fourth coil prepared in the starting means, and the first coil prepared in the operation means and the fourth coil prepared in the starting means are covered with a resin cover.