# US 11,999,591 B1 · Elevator system including sensor assembly for person detection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,999,591 B1 - Document ID: US11999591B1 - Status: Granted - Kind: B1 - Application number: 18/333,258 - Filed: 2023-06-12 - Granted: 2024-06-04 - Earliest claimed: 2023-06-12 - Assignees: Otis Elevator Company - Applicants: Otis Elevator Company - Inventors: Randy Roberts; Johanna Whitwell; James Tilsley Auxier; Kathleen Nicole Moore; Kyler Vensel - Web page: https://patentgrep.com/patent/US11999591B1 ## CPC - B66B 5/005: {Safety of maintenance personnel} - B66B 5/0031: {for safety reasons} - B66B 5/0087: {Devices facilitating maintenance, repair or inspection tasks (devices incorporated in the buffer B66B5/288; railings on top of the car B66B11/0226)} - B66B: ELEVATORS; ESCALATORS OR MOVING WALKWAYS ({apparatus for raising or lowering persons on theatrical stages or the like A63J5/12} ; funicular railbound systems with rigid ground-supported tracks and cable traction, e.g. cliff railways, B61B9/00; arrangements of ammunition handlers in vessels B63G3/00; hoists, lifts, or conveyors for loading or unloading in general B65G; braking or detent devices controlling normal movements of winding drums or barrels B66D; ship-lifting devices E02C; garages for many vehicles with mechanical means for lifting vehicles E04H6/12; hoists for feeding ammunition or projectiles to launching apparatus or to loading mechanisms F41A9/00) ## Abstract An elevator system includes a hoistway; an elevator car configured to travel in the hoistway; a pit located at a bottom of the hoistway; a safety chain configured to enable or disable motion of the elevator car; and a sensor assembly configured to initiate opening the safety chain to disable motion of the elevator car upon detection of a person in the pit. ## Claims ### Claim 1 An elevator system comprising: a hoistway; an elevator car configured to travel in the hoistway; a pit located at a bottom of the hoistway; a safety chain configured to enable or disable motion of the elevator car; and a sensor assembly configured to initiate opening the safety chain to disable motion of the elevator car upon detection of a person in the pit; a second hoistway; a second elevator car configured to travel in the second hoistway; a second pit located at a bottom of the second hoistway; a second safety chain configured to enable or disable motion of the second elevator car; and a second sensor assembly configured to initiate opening the second safety chain to disable motion of the second elevator car upon detection of the person in the second pit; wherein the sensor assembly and the second sensor assembly are in communication; wherein the sensor assembly, upon detection of the person in the pit, sends a communication to the second sensor assembly; wherein in response to the communication, the second sensor assembly increases sensitivity of the second sensor assembly to detect the person in the second pit. ### Claim 2 (depends on 1) The elevator system of claim 1, wherein the sensor assembly is configured to open the safety chain upon detecting the person in the pit and detecting that the safety chain is closed. ### Claim 3 (depends on 1) The elevator system of claim 1, wherein the sensor assembly is configured to generate an alarm upon detecting the person in the pit and detecting that the safety chain is closed. ### Claim 4 (depends on 1) The elevator system of claim 1, further comprising a run-stop interface in the pit, the run-stop interface configured to open or close the safety chain upon activation by the person. ### Claim 5 (depends on 1) The elevator system of claim 1, wherein the sensor assembly includes at least one sensor that measures distances to objects in the pit. ### Claim 6 (depends on 5) The elevator system of claim 5, wherein the at least one sensor includes at least one of a LIDAR sensor, a millimeter wave RADAR sensor and an RGBD camera. ### Claim 7 (depends on 1) The elevator system of claim 1, wherein the sensor assembly includes a sensor assembly safety chain contact as a component of the safety chain. ### Claim 8 (depends on 1) The elevator system of claim 1, further comprising a second sensor assembly configured to open the safety chain to disable motion of the elevator car upon detection of the person in the pit. ### Claim 9 (depends on 8) The elevator system of claim 8, wherein the second sensor assembly includes a second sensor assembly safety chain contact as a component of the safety chain. ### Claim 10 (depends on 1) The elevator system of claim 1, wherein: increasing the sensitivity of the second sensor assembly includes at least one of (i) decreasing a threshold used to detect the person in the second pit, (ii) increasing a frame rate of the second sensor assembly, (iii) reducing a field of view of the second sensor assembly and (iv) increasing a resolution of the second sensor assembly. ### Claim 11 (depends on 10) The elevator system of claim 10, wherein: upon the person not being present in the pit or the second pit for a pre-defined period of time, the second sensor assembly resets the sensitivity to detect the person in the second pit to an initial value. ### Claim 12 (depends on 11) The elevator system of claim 11, further comprising closing the safety chain in the pit. ### Claim 13 An elevator system comprising: a hoistway; an elevator car configured to travel in the hoistway; a pit located at a bottom of the hoistway; a safety chain configured to enable or disable motion of the elevator car; a sensor assembly configured to initiate opening the safety chain to disable motion of the elevator car upon detection of a person in the pit; a second hoistway; a second elevator car configured to travel in the second hoistway; a second pit located at a bottom of the second hoistway; a second safety chain configured to enable or disable motion of the second elevator car; and a second sensor assembly configured to initiate opening the second safety chain to disable motion of the second elevator car upon detection of the person in the second pit; wherein in response to actuation of a run-stop interface in the pit, the sensor assembly sends a communication to the second sensor assembly to increase sensitivity of the second sensor assembly to detect the person in the second pit. ### Claim 14 An elevator system comprising: a hoistway; an elevator car configured to travel in the hoistway; a pit located at a bottom of the hoistway; a safety chain configured to enable or disable motion of the elevator car; a sensor assembly configured to initiate opening the safety chain to disable motion of the elevator car upon detection of a person in the pit; a second hoistway; a second elevator car configured to travel in the second hoistway; a second pit located at a bottom of the second hoistway; a second safety chain configured to enable or disable motion of the second elevator car; and a second sensor assembly configured to initiate opening the second safety chain to disable motion of the second elevator car upon detection of the person in the second pit; wherein in response to opening of the safety chain in the pit, the sensor assembly sends a communication to the second sensor assembly to increase sensitivity of the second sensor assembly to detect the person in the second pit. ### Claim 15 A method of operating an elevator system including a hoistway, an elevator car configured to travel in the hoistway, a pit located at a bottom of the hoistway, a safety chain configured to enable or disable motion of the elevator car and a sensor assembly, the method comprising: detecting, by the sensor assembly, a person in the pit; and upon detection of a person in the pit, the sensor assembly initiating opening the safety chain to disable motion of the elevator car; wherein in response to opening of the safety chain, the sensor assembly sends a communication to a second sensor assembly to increase sensitivity of the second sensor assembly to detect the person in a second pit. ### Claim 16 A computer program embodied on a non-transitory computer-readable storage medium, the computer program including instructions for causing a processor to implement a process for operating an elevator system including a hoistway, an elevator car configured to travel in the hoistway, a pit located at a bottom of the hoistway, a safety chain configured to enable or disable motion of the elevator car and a sensor assembly, the process comprising: detecting, by the sensor assembly, a person in the pit; and upon detection of a person in the pit, the sensor assembly initiating opening the safety chain to disable motion of the elevator car; wherein in response to opening of the safety chain, the sensor assembly sends a communication to a second sensor assembly to increase sensitivity of the second sensor assembly to detect the person in a second pit.