Abstract: An in line key-locked switch for a power cord for electronic equipment. The key locked switch may be easily connected to the power cord of electronic apparatus such as a television set to limit access to the electronic apparatus. The key locked switch, generally stated, comprises, a two piece protective outer casing including a base portion, and a nestable cover portion, a key actuated switch mounted within the outer casing, and piercing means mounted to the cover portion for piercing the cut separate ends of a lead of the power cord to provide electrical contact with the key actuated switch. The protective outer casing includes a piercing guide for engaging the separate lead wires of the power cord to hold the separate ends in position for piercing by the piercing means.

Abstract: Electrical control switch mechanisms of the so-called "dead-man" type which may be used to actuate the operation of small electrically powered tools such as mowers, trimmers and the like. These switch mechanisms provide for immediate deactivation of the tool upon release by the operator.

Abstract: A remotely controlled pneumatically operated switch consisting of a pneumatic actuator and a mechanical switch assembly and interconnecting pneumatic tubing. The switch assembly has extending contact blades for insertion into an electrical receptacle, and also has slot recesses for receiving the contact blades of an electrical plug. The switch is opened or closed by the action of a rotatable cam on an electrically conductive spring arm. The assembly provides for convenience in switching and also provides a safety factor to the user.

Abstract: An electrical cutting appliance is provided with a housing and cutting or shearing blades driven from a motor. The motor, incorporated in the main electrical circuit of the appliance, is connectible to a source of electrical energy through external switching contacts which are outside and separate from said housing and which also are included in the main electrical circuit, the appliance only being operable when the external contacts are closed.

Abstract: A circuit and circuit elements are disclosed to operate a lamp independently from either a two-position wall-mounted switch or a two-position lamp-mounted switch.