US 12,275,618 B2
Shaft door with a door guard arrangement
Bruno Castro Silva, Sao Paulo (BR); Pietro Panegassi Picchiotti, Sao Paulo (BR); Murilo Lopes Santos, Sao Paulo (BR); Alberto Yoshiyuki Hosoda, Sao Paulo (BR); Marco Antonio Scherk Junior, Sao Paulo (BR); and Gina Haruno Shida Matsumoto, Sao Paulo (BR)
Assigned to INVENTIO AG, Hergiswil (CH)
Appl. No. 18/556,105
Filed by Inventio AG, Hergiswil (CH)
PCT Filed Apr. 7, 2022, PCT No. PCT/EP2022/059178
§ 371(c)(1), (2) Date Oct. 19, 2023,
PCT Pub. No. WO2022/228847, PCT Pub. Date Nov. 3, 2022.
Claims priority of application No. 21170925 (EP), filed on Apr. 28, 2021.
Prior Publication US 2024/0182270 A1, Jun. 6, 2024
Int. Cl. B66B 13/26 (2006.01)
CPC B66B 13/26 (2013.01) 15 Claims
OG exemplary drawing
 
1. 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.