# US 10,479,650 B2 · Arrangement for reducing displacement of an elevator car caused by a change in loading > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,479,650 B2 - Document ID: US10479650B2 - Status: Granted - Kind: B2 - Application number: 14/965,672 - Filed: 2015-12-10 - Published: 2016-04-07 - Granted: 2019-11-19 - Earliest claimed: 2013-07-04 - Assignees: Kone Corporation - Applicants: KONE Corporation - Inventors: Pentti Alasentie; Hannu Lehtinen; Pekka Rantanen - Web page: https://patentgrep.com/patent/US10479650B2 ## CPC - B66B 7/10: for equalising rope or cable tension - B66B 11/04: Driving gear {; Details thereof, e.g. seals (braking devices acting on the driving gear B66B5/02; of mining-hoist winding devices B66B15/08)} - B66B 17/34: Safe lift clips; Keps - 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 arrangement for reducing the displacement of an elevator car caused by a change in loading includes at least an elevator car configured to move up and down in an elevator hoistway and one or more counterweights, and also at least one rope element above the elevator car and at least one rope element below the elevator car and at least one pretensioner of the rope elements. The elevator car and counterweight are configured to be supported and moved via the rope elements and the pretensioner and rope pulleys, of which rope pulleys the first part are diverting pulleys, and the second part are traction sheaves. The arrangement additionally includes at least two hoisting machines. In the arrangement is a mechanism configured to lock at least two rope pulleys to be non-rotating at least during loading of the elevator car. ## Claims ### Claim 1 An arrangement for reducing the displacement of an elevator car caused by a change in loading, comprising: the elevator car configured to move up and down in an elevator hoistway; one or more counterweights; at least one rope element essentially above the elevator car; at least one rope element essentially below the elevator car; and at least one pretensioner of the rope elements, wherein the elevator car and one or more counterweights are configured to be supported and to be moved via the rope elements and the at least one pretensioner, and a plurality of rope pulleys, of which rope pulleys the first part are diverting pulleys, and the second part are traction sheaves or corresponding, wherein the arrangement comprises at least two hoisting machines, wherein the arrangement includes a locking mechanism configured to lock at least two rope pulleys to be non-rotating at least during loading of the elevator car, wherein a first end of the at least one rope element below the elevator car is fixed to, via the pretensioner, a bottom end of one of the one or more counterweights or a bottom part of the elevator hoistway, a second end of the at least one rope element below the elevator car is led to pass around one or more of the plurality of rope pulleys, and the pretensioner is configured to provide a constant tensioning force to the at least one rope element below the elevator car, and wherein the pretensioner includes: a roll rotating around an axis of rotation; an adjustment element fixed to the roll, the adjustment element rotating along with the roll and being eccentric with respect to the axis of rotation of the roll; and a tensioning rope is configured to rotate the adjustment element under a tensioning force, wherein the at least one rope element below the elevator car is fixed to an outer rim of the roll such that the first end of the at least one rope element below the elevator car can be coiled onto the roll when the roll rotates around the axis of rotation as the at least one rope element loosens. ### Claim 2 (depends on 1) The arrangement according to claim 1, wherein of the rope pulleys to be locked to be non-rotating during loading of the elevator car, at least one is a traction sheave. ### Claim 3 (depends on 2) The arrangement according to claim 2, wherein in the arrangement is a mechanism configured to lock the vertical movement and rotation of the diverting pulleys in the top part and bottom part of the elevator hoistway during the loading of the elevator car. ### Claim 4 (depends on 2) The arrangement according to claim 2, wherein the rope element above the elevator car and the rope element below the elevator car are essentially similar to each other. ### Claim 5 (depends on 2) The arrangement according to claim 2, wherein the pretensioner is arranged to bring about pretension in the rope elements, said pretension being preset to be greater than a pre-estimated greatest change caused by the loading in a loading situation of the elevator car. ### Claim 6 (depends on 2) The arrangement according to claim 2, wherein, for discharging in a controlled manner, in connection with starting of the elevator car, the tension produced in the roping during loading of the elevator car, the hoisting machines comprise a mechanical brake and a motor drive. ### Claim 7 (depends on 1) The arrangement according to claim 1, wherein in the arrangement is a mechanism configured to lock the vertical movement and rotation of the diverting pulleys in the top part and bottom part of the elevator hoistway during the loading of the elevator car. ### Claim 8 (depends on 7) The arrangement according to claim 7, wherein the rope element above the elevator car and the rope element below the elevator car are essentially similar to each other. ### Claim 9 (depends on 7) The arrangement according to claim 7, wherein the pretensioner is arranged to bring about pretension in the rope elements, said pretension being preset to be greater than a pre-estimated greatest change caused by the loading in a loading situation of the elevator car. ### Claim 10 (depends on 7) The arrangement according to claim 7, wherein, for discharging in a controlled manner, in connection with starting of the elevator car, the tension produced in the roping during loading of the elevator car, the hoisting machines comprise a mechanical brake and a motor drive. ### Claim 11 (depends on 1) The arrangement according to claim 1, wherein the rope element above the elevator car and the rope element below the elevator car are essentially similar to each other. ### Claim 12 (depends on 11) The arrangement according to claim 11, wherein the pretensioner is arranged to bring about pretension in the rope elements, said pretension being preset to be greater than a pre-estimated greatest change caused by the loading in a loading situation of the elevator car. ### Claim 13 (depends on 1) The arrangement according to claim 1, wherein the pretensioner is arranged to bring about pretension in the rope elements, said pretension being preset to be greater than a pre-estimated greatest change caused by the loading in a loading situation of the elevator car. ### Claim 14 (depends on 1) The arrangement according to claim 1, wherein, for discharging in a controlled manner, in connection with starting of the elevator car, the tension produced in the roping during loading of the elevator car, the hoisting machines comprise a mechanical brake and a motor drive. ### Claim 15 (depends on 1) The arrangement according to claim 1, wherein the two hoisting machines are configured to move one and the same rope element. ### Claim 16 (depends on 1) The arrangement according to claim 1, wherein the two hoisting machines are configured to move one and the same rope element that is above the elevator car. ### Claim 17 (depends on 1) The arrangement according to claim 1, wherein the two hoisting machines are configured to move one and the same rope element that is below the elevator car. ### Claim 18 (depends on 1) The arrangement according to claim 1, wherein the two hoisting machines include a first hoisting machine configured to move the rope element that is above the elevator car and a second hoisting machine configured to move the rope element that is below the elevator car. ### Claim 19 (depends on 1) The arrangement according to claim 1, wherein the elevator is provided with four hoisting machines, of which two hoisting machines are configured to move the rope element that is above the elevator car and two hoisting machines are configured to move the rope element that is below the elevator car. ### Claim 20 (depends on 1) The arrangement according to claim 1, wherein the elevator is provided with six hoisting machines, of which three hoisting machines are configured to move the rope element that is above the elevator car and three hoisting machines are configured to move the rope element that is below the elevator car.