# US 9,434,575 B2 · Method and device for a safe emergency stop of an elevator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,434,575 B2 - Document ID: US9434575B2 - Status: Granted - Kind: B2 - Application number: 13/855,302 - Filed: 2013-04-02 - Published: 2013-08-22 - Granted: 2016-09-06 - Earliest claimed: 2010-10-11 - Assignees: Kone Corporation - Applicants: KONE Corporation - Inventors: Ari Kattainen; Antti Hovi - Web page: https://patentgrep.com/patent/US9434575B2 ## CPC - B66B 1/308: {with AC powered elevator drive} - B66B 1/32: effective on braking devices {, e.g. acting on electrically controlled brakes (brake control H02P, lift brakes per se B66B5/02)} - B66B 5/0031: {for safety reasons} - B66B 5/02: responsive to abnormal operating conditions - H02P 3/02: Details {of stopping control} - H02P 3/18: for stopping or slowing an AC motor - 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) - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS ## Abstract A method and a safety device for implementing the method are provided in connection with a quick stop situation of an elevator. In the method, an activation process of a machinery brake is started and also a disconnection process of the current supply of the elevator motor is started after the starting of the activation process of a machinery brake. ## Claims ### Claim 1 A method in connection with a quick stop situation of an elevator, said method comprising the steps of: starting an activation process of a machinery brake; and starting a disconnection process of a current supply for disconnecting the current supply occurring from a power source to an elevator motor, wherein the disconnection process of the current supply is started after the starting of the activation process of the machinery brake. ### Claim 2 (depends on 1) The method according to claim 1, wherein when a quick stop situation of the elevator starts, motor braking for decelerating the speed of rotation of the traction sheave of the hoisting machine is started. ### Claim 3 (depends on 1) The method according to claim 1, wherein: a control command for activating a quick stop situation of the elevator is sent from a safety device of the elevator to the elevator control unit. ### Claim 4 (depends on 1) The method according to claim 1, wherein: the activation process of the machinery brake as well as the disconnection process of the current supply are started with the elevator control unit. ### Claim 5 (depends on 1) The method according to claim 1, wherein: the start of the disconnection process of the current supply is delayed by the amount of the starting delay from the starting moment of the activation process of the brake. ### Claim 6 (depends on 5) The method according to claim 5, wherein: the starting delay of the disconnection process of the current supply is determined on the basis of the activation delay of the machinery brake. ### Claim 7 (depends on 1) The method according to claim 1, wherein: the status of the safety circuit of an elevator in connection with a quick stop situation of the elevator is determined with a safety device of the elevator; the status of the safety circuit of the elevator is monitored with a safety device of the elevator; and a separate safety process is started with a safety device of the elevator for activating the machinery brake in connection with a quick stop situation of the elevator and also for immediately disconnecting the current supply occurring from the power source to the elevator motor when the safety circuit of the elevator so requires. ### Claim 8 (depends on 1) The method according to claim 1, wherein: the position and/or movement of the elevator car and/or the hoisting machine is/are determined in connection with a quick stop situation of the elevator with a safety device of the elevator; the position and/or movement of the elevator car and/or the hoisting machine is/are, in connection with a quick stop situation of the elevator, compared by a safety device of the elevator to the limit value for the movement and/or position defined as permitted for the elevator car and/or the hoisting machine; and a safety process is started with a safety device of the elevator for activating the machinery brake and also for immediately disconnecting the current supply occurring from the power source to the elevator motor when detecting that the movement and/or position of the elevator car and/or of the hoisting machine in this case deviate(s) from that permitted. ### Claim 9 (depends on 7) The method according to claim 7, wherein: a controllable switch is fitted into the electricity supply circuit of the electromagnet of the machinery brake; a controllable switch is fitted into the power supply circuit of the elevator motor; and the safety process is started by forming a control command for opening the aforementioned controllable switch fitted into the electricity supply circuit of the electromagnet of the machinery brake and also for opening the controllable switch fitted into the power supply circuit of the elevator motor. ### Claim 10 (depends on 1) The method according to claim 1, wherein: the operating status of the elevator is determined; and a quick stop situation of the elevator is activated in connection with an operational special situation of the elevator. ### Claim 11 (depends on 1) A safety arrangement of an elevator, comprising: a safety device of the elevator, which safety device is fitted to receive information about the operating status of the elevator and further to activate a quick stop situation of the elevator in connection with an operational special situation of the elevator, wherein the safety arrangement is arranged to implement the method according to claim 1 in connection with the quick stop situation of the elevator. ### Claim 12 (depends on 11) The safety arrangement according to claim 11, wherein the safety device comprises a control. ### Claim 13 (depends on 12) The safety arrangement according to claim 12, wherein the control is arranged to form a control command for activating a quick stop situation of the elevator. ### Claim 14 (depends on 12) The safety arrangement according to claim 12, wherein the control is arranged to activate the safety process for activating the machinery brake and also for disconnecting the current supply occurring from the power source to the elevator motor. ### Claim 15 (depends on 12) The safety arrangement according to claim 12, wherein the control is made redundant. ### Claim 16 (depends on 2) The method according to claim 2, wherein a control command for activating a quick stop situation of the elevator is sent from a safety device of the elevator to the elevator control unit. ### Claim 17 (depends on 2) The method according to claim 2, wherein the activation process of the machinery brake as well as the disconnection process of the current supply are started with the elevator control unit. ### Claim 18 (depends on 3) The method according to claim 3, wherein the activation process of the machinery brake as well as the disconnection process of the current supply are started with the elevator control unit. ### Claim 19 (depends on 2) The method according to claim 2, wherein the start of the disconnection process of the current supply is delayed by the amount of the starting delay from the starting moment of the activation process of the brake. ### Claim 20 (depends on 3) The method according to claim 3, wherein the start of the disconnection process of the current supply is delayed by the amount of the starting delay from the starting moment of the activation process of the brake.