Shaft door with a door guard arrangement

A shaft door with a door guard arrangement for an elevator, the door guard arrangement comprising:

• a safety switch;
• a force sensor having a contact element and a spring mechanism with a spring, wherein the force sensor is installed at the shaft door and senses a presence of an object clamped by the shaft door by the contact element contacting the clamped object due to the shaft door closing, the contact element transferring to the spring a force generated when the object is contacted;
• and
• the spring mechanism activating the safety switch to send a door-to-open command to a door operator for the shaft door when the force transferred to the spring exceeds a stiffness of the spring.

An elevator comprising:

• a shaft door with a door guard arrangement;
• a door operator that opens and closes the shaft door;
• and
• wherein the door guard arrangement has a safety switch and a force sensor, the force sensor including a contact element and a spring mechanism with a spring;
• wherein the force sensor is installed at a door frame of the shaft door or in a door panel of the shaft door and the force sensor senses a presence of an object clamped by the shaft door by the contact element contacting the clamped object due to the shaft door closing, the contact element transferring to the spring a force generated when the object is contacted;
• and
• wherein the spring mechanism activates the safety switch to send a door-to-open command to the door operator when the force transferred to the spring exceeds a stiffness of the spring.