# US 11,078,050 B2 · Speed detection device and passenger conveyer device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,078,050 B2 - Document ID: US11078050B2 - Status: Granted - Kind: B2 - Application number: 16/283,238 - Filed: 2019-02-22 - Published: 2019-08-29 - Granted: 2021-08-03 - Earliest claimed: 2018-02-23 - Assignees: Otis Elevator Company - Applicants: Otis Elevator Company - Inventors: Lifei Cheng; Zhaoxia Hu - Web page: https://patentgrep.com/patent/US11078050B2 ## CPC - B66B 27/00: Indicating operating conditions of escalators or moving walkways (of general application G08) - B66B 23/02: Driving gear - G01P 3/02: Devices characterised by the use of mechanical means - 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) - G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G}) ## Abstract A speed monitoring device and a passenger conveying device. The speed monitoring device includes a transmission rotor disposed on a shaft side surface of a shaft of which the speed is to be measured and rotating with rotation of the shaft of which the speed is to be measured; an encoder having an input shaft, the input shaft of the encoder being connected to the transmission rotor and rotating with rotation of the transmission rotor; and a mounting bracket for securing the transmission rotor and the encoder to a position where they are to be mounted. ## Claims ### Claim 1 A speed monitoring device comprising: a transmission rotor disposed on a shaft side surface of a shaft of which the speed is to be measured and rotating with rotation of the shaft of which the speed is to be measured; an encoder having an input shaft, the input shaft of the encoder being connected to the transmission rotor and rotating with rotation of the transmission rotor; a mounting bracket for securing the transmission rotor and the encoder to a position where they are to be mounted; a friction increasing portion disposed around the shaft of which the speed is to be measured and having an outer circumferential surface that is engaged with the transmission rotor. ### Claim 2 (depends on 1) The speed monitoring device according to claim 1, further comprising a positioning portion disposed at a connection position of the input shaft of the encoder and the transmission rotor, for preventing a relative movement between the encoder and the transmission rotor. ### Claim 3 (depends on 1) The speed monitoring device according to claim 1, wherein the transmission rotor has an outer circumferential surface made of polyurethane and/or a rotor body made of a nylon material. ### Claim 4 (depends on 3) The speed monitoring device according to claim 3, wherein the outer circumferential surface of the transmission rotor is integrally formed with the rotor body. ### Claim 5 (depends on 3) The speed monitoring device according to claim 3, wherein a reinforcing rib is further disposed on a sidewall of the rotor body. ### Claim 6 (depends on 1) The speed monitoring device according to claim 1, wherein a static friction coefficient of the outer circumferential surface of the friction increasing portion is larger than a static friction coefficient of the outer circumferential surface of the shaft of which the speed is to be measured. ### Claim 7 (depends on 6) The speed monitoring device according to claim 6, wherein the friction increasing portion comprises a retaining ring that is disposed around the shaft of which the speed is to be measured and remains relatively stationary with respect to the shaft of which the speed is to be measured during operation. ### Claim 8 (depends on 7) The speed monitoring device according to claim 7, wherein the retaining ring comprises a plurality of retaining segments engaged to one another. ### Claim 9 (depends on 8) The speed monitoring device according to claim 8, wherein each of the plurality of retaining segments has an inclined end surface, and the inclined end surfaces of adjacent retaining segments are engaged with each other. ### Claim 10 (depends on 8) The speed monitoring device according to claim 8, further comprising a plurality of sets of stepped shafts, each having a first stepped segment and a second stepped segment; a plurality of sets of positioning members; and mounting holes respectively disposed on sidewalls of adjacent retaining segments near ends; wherein in a mounted state, the first stepped segment is engaged with the mounting hole of the retaining segment; the second stepped segment passes through the mounting hole, and the second stepped segment is provided with a fastening hole; the positioning member in each set fastens an adjacent stepped shaft through the fastening hole in the second stepped segment. ### Claim 11 (depends on 7) The speed monitoring device according to claim 7, wherein a convex portion is provided on an inner circumferential surface of the retaining ring, and the retaining ring is in an interference fit with the shaft of which the speed is to be measured through the convex portion. ### Claim 12 (depends on 11) The speed monitoring device according to claim 11, wherein the convex portion is constructed as a strip-shaped boss. ### Claim 13 (depends on 1) The speed monitoring device according to claim 1, further comprising a pressure bearing bracket, wherein the transmission rotor and the encoder are fixed to the pressure bearing bracket through the mounting bracket; and in an operation state, the pressure bearing bracket is used for providing pressure from the transmission rotor toward the shaft of which the speed is to be measured. ### Claim 14 (depends on 13) The speed monitoring device according to claim 13, wherein the pressure bearing bracket comprises: a torque fulcrum, an elastic member located on a first side of the torque fulcrum, and a second side opposite to the first side; wherein the transmission rotor and the encoder are connected through the mounting bracket to the pressure bearing bracket at the second side of the torque fulcrum; and the elastic member acts as a source of pressure that presses the transmission rotor against the shaft of which the speed is to be measured. ### Claim 15 (depends on 14) The speed monitoring device according to claim 14, further comprising an elastic force control portion coupled to the elastic member and configured to control a degree of compression of the elastic member. ### Claim 16 (depends on 13) The speed monitoring device according to claim 13, wherein the transmission rotor and the pressure bearing bracket are disposed on an upper side or a lower side of the shaft of which the speed is to be measured. ### Claim 17 (depends on 13) The speed monitoring device according to claim 13, wherein a line connecting circle centers of the transmission rotor and the shaft of which the speed is to be measured is at an angle of 45°-90° with respect to a horizontal plane. ### Claim 18 (depends on 13) The speed monitoring device according to claim 13, further comprising a shroud; wherein the shroud is disposed on a side of the pressure bearing bracket and the transmission rotor away from the shaft of which the speed is to be measured. ### Claim 19 (depends on 1) A passenger conveying device comprising the speed monitoring device according to claim 1, wherein the speed monitoring device is disposed on a shaft side surface of a main drive shaft. ### Claim 20 A speed monitoring device comprising: a transmission rotor disposed on a shaft side surface of a shaft of which the speed is to be measured and rotating with rotation of the shaft of which the speed is to be measured; an encoder having an input shaft, the input shaft of the encoder being connected to the transmission rotor and rotating with rotation of the transmission rotor; a mounting bracket for securing the transmission rotor and the encoder to a position where they are to be mounted; a positioning portion disposed at a connection position of the input shaft of the encoder and the transmission rotor, for preventing a relative movement between the encoder and the transmission rotor; wherein the transmission rotor has a stepped mounting hole, and the positioning portion comprises an elastic plug; wherein a first side of the stepped mounting hole is engaged with the input shaft of the encoder, and the elastic plug is engaged with a second side of the stepped mounting hole and the input shaft of the encoder. ### Claim 21 (depends on 20) The speed monitoring device according to claim 20, wherein the elastic plug is constructed to have a frustoconical body and is provided on a sidewall thereof with a receiving region for providing space for elastic deformation; wherein in a mounted state, one end of the elastic plug having a smaller diameter is toward the stepped mounting hole. ### Claim 22 A speed monitoring device, characterized by comprising: a transmission rotor disposed on a shaft side surface of a shaft of which the speed is to be measured and rotating with rotation of the shaft of which the speed is to be measured; an encoder having an input shaft, the input shaft of the encoder being connected to the transmission rotor and rotating with rotation of the transmission rotor; a mounting bracket for securing the transmission rotor and the encoder to a position where they are to be mounted; a pressure bearing bracket, wherein the transmission rotor and the encoder are fixed to the pressure bearing bracket through the mounting bracket; and in an operation state, the pressure bearing bracket is used for providing pressure from the transmission rotor toward the shaft of which the speed is to be measured; the pressure bearing bracket including a torque fulcrum, an elastic member located on a first side of the torque fulcrum, and a second side opposite to the first side, wherein the transmission rotor and the encoder are connected through the mounting bracket to the pressure bearing bracket at the second side of the torque fulcrum and the elastic member acts as a source of pressure that presses the transmission rotor against the shaft of which the speed is to be measured; an elastic force control portion coupled to the elastic member and configured to control a degree of compression of the elastic member; wherein a window is further disposed on the pressure bearing bracket and is disposed at a connection position of the elastic force control portion and the elastic member for checking a current compression degree of the elastic member.