Abstract: A safety switch is improved by the feature of staying in an open position in the event of breakage of a working rod or breakage or dropout of an operation portion and having a simple structure facilitating size reduction. Even if a rotary shaft is released from a supported state in an operation portion because an operating force of an operation or the number of operations of extracting an actuator from the operation portion exceeds a breakage tolerance, a working rod is permitted to move in an urging direction of a coil spring and is assuredly moved to the operation portion. Therefore, a switch can be assuredly set to an open position and, hence, the safety switch can achieve the safety improvement.

Abstract: A safety switch is improved by the feature of staying in an open position in the event of breakage of a working rod or breakage or dropout of an operation portion and having a simple structure facilitating size reduction. Even if a rotary shaft is released from a supported state in an operation portion because an operating force of an operation or the number of operations of extracting an actuator from the operation portion exceeds a breakage tolerance, a working rod is permitted to move in an urging direction of a coil spring and is assuredly moved to the operation portion. Therefore, a switch can be assuredly set to an open position and, hence, the safety switch can achieve the safety improvement.

Abstract: A door lock apparatus with safety switch capable of locking a door. A coupling member is pivotally moved about a pivotal shaft by a closing operation by a rotary handle, thereby bringing an engaging portion thereof into engagement with a fixing member, so that a protective door is inhibited from moving in two directions of arrows X, Y including a moving direction of the door. Whether the door is of a slide or pivot type, the door is assuredly locked in a closed state because the door is inhibited from moving in the two directions including the moving direction thereof. If an operation mistake is made to open the door, the force for opening the door is not directly applied to the switch body or the actuator. A safety switch may achieve an increase in durability.

Abstract: A safety holder is provided that firmly attaches to a safety switch so that safety of a worker is enhanced. The safety holder includes a base body 21 that is inserted into an actuator insertion opening 7, and limits rotation of a drive cam 9 by engaging at a tip end portion (hanging portion 21C) thereof with a concave portion of the drive cam 9 of the safety switch, and a slide body that is movably attached to the base body 21 so as to be insertable into an actuator insertion opening 8 with the base body 21 inserted in the actuator insertion opening 7, and when the slide body is inserted into the actuator insertion opening 8, that enters and engages with an engagement hole 36 of the base body 21 whose tip end portion (insertion arm 34) is being inserted into the insertion opening 7.

Abstract: A door lock apparatus with safety switch capable of assuredly locking a door is provided. A coupling member is pivotally moved about a pivotal shaft by a closing operation by way of a rotary handle, thereby bringing an engaging portion thereof into engagement with a fixing member, so that a protective door is inhibited from moving in two directions of arrows X, Y including a moving direction of the protective door. Whether the protective door is of a slide type or a pivot type, the protective door is assuredly locked in a closed state because the protective door is inhibited from moving in the two directions including the moving direction thereof. Further, if an operation mistake or the like is made to forcibly open the protective door, the force for opening the protective door is not directly applied to the switch body or the actuator. Hence, a safety switch may achieve an increased in durability.

Abstract: A safety holder is provided that firmly attaches to a safety switch so that safety of a worker is enhanced. The safety holder includes a base body 21 that is inserted into an actuator insertion opening 7, and limits rotation of a drive cam 9 by engaging at a tip end portion (hanging portion 21C) thereof with a concave portion of the drive cam 9 of the safety switch, and a slide body that is movably attached to the base body 21 so as to be insertable into an actuator insertion opening 8 with the base body 21 inserted in the actuator insertion opening 7, and when the slide body is inserted into the actuator insertion opening 8, that enters and engages with an engagement hole 36 of the base body 21 whose tip end portion (insertion arm 34) is being inserted into the insertion opening 7.

Abstract: A safety switch capable of detecting withdrawal of an actuator from a switch main unit in a sure and reliable manner even when the safely switch, including a lock mechanism, is in a locked condition and an attempt is made to forcibly withdraw the actuator from the switch main unit. Even when a drive cam becomes capable of rotation since not less than one of a notch cut-out section and a lock member is broken by forcibly extracting an actuator with rotation of the drive cam locked, a cam curve section of the drive cam and an operating rod are in a normal condition and free of breakage. Accordingly, if the drive cam rotates in a counter-clockwise direction, normally-closed contacts of a contact section adopt an open condition normally, and even in situations where the actuator is withdrawn from the switch main unit with a force equal to or greater than the fracture strength of the safety switch, withdrawal of the actuator from the switch main unit can be detected in a sure and reliable manner.

Abstract: A safety switch capable of detecting withdrawal of an actuator from a switch main unit in a sure and reliable manner even when the safety switch, including a lock mechanism, is in a locked condition and an attempt is made to forcibly withdraw the actuator from the switch main unit. Even when a drive cam becomes capable of rotation since not less than one of a notch cut-out section and a lock member is broken by forcibly extracting an actuator with rotation of the drive cam locked, a cam curve section of the drive cam and an operating rod are in a normal condition and free of breakage. Accordingly, if the drive cam rotates in a counter-clockwise direction, normally-closed contacts of a contact section adopt an open condition normally, and even in situations where the actuator is withdrawn from the switch main unit with a force equal to or greater than the fracture strength of the safety switch, withdrawal of the actuator from the switch main unit can be detected in a sure and reliable manner.