Idec Corporation

Norifumi Obata

Takeo Yasui

Masaki Nobuhiro

Etsurou Komori

Takafumi Hidaka

Kiyo Hidaka, Legal Representative

Takao Fukui

Masahiro Ishizaki

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.

Safety switch

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.

Door lock device with safety switch

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 bodythat is inserted into an actuator insertion opening, and limits rotation of a drive camby engaging at a tip end portion (hanging portionC) thereof with a concave portion of the drive camof the safety switch, and a slide body that is movably attached to the base bodyso as to be insertable into an actuator insertion openingwith the base bodyinserted in the actuator insertion opening, and when the slide body is inserted into the actuator insertion opening, that enters and engages with an engagement holeof the base bodywhose tip end portion (insertion arm) is being inserted into the insertion opening

Safety holder

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.

Growing community of inventors

Osaka, Japan

Norifumi Obata