# US 11,307,080 B2 · Method and system for determining the weight of a demountable platform > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,307,080 B2 - Document ID: US11307080B2 - Status: Granted - Kind: B2 - Application number: 16/575,429 - Filed: 2019-09-19 - Published: 2020-03-26 - Granted: 2022-04-19 - Earliest claimed: 2018-09-20 - Assignees: Hiab AB - Applicants: Hiab AB - Inventors: Pasi Siren - Web page: https://patentgrep.com/patent/US11307080B2 ## CPC - G01G 19/083: {lift truck scale} - B60P 1/6463: {fitted with articulated beams for longitudinal displacement of the container} - G01G 19/10: having fluid weight-sensitive devices - G01G 19/12: having electrical weight-sensitive devices - G01G: WEIGHING (sorting by weighing B07C5/16) - B60P: VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS (vehicles with special provisions for transporting patients or disabled persons, or their personal conveyances A61G3/00) ## Abstract The present invention relates to a method for determining the weight of a demountable platform. In the method, a hooklift is used to lift the demountable platform from the ground onto a vehicle, values of a force acting on a main cylinder of the hooklift are determined at predetermined intervals of a physical quantity that varies as a function of the movement of the hooklift, and the weight of the demountable platform is calculated using the determined values of the force. The present invention also relates to a system for determining the weight of a demountable platform. ## Claims ### Claim 1 A method for determining the weight of a demountable platform, comprising: using a hooklift to lift the demountable platform from the ground onto a vehicle, measuring a physical quantity that varies as a function of the movement of the hooklift, determining, at predetermined intervals of the physical quantity, values of a force acting on a main cylinder of the hooklift, and calculating the weight of the demountable platform based on a discrete integral of the determined values of the force over the physical quantity. ### Claim 2 (depends on 1) The method according to claim 1, wherein the weight of the demountable platform is calculated by integrating the force over the physical quantity and comparing a result of the discrete integral to stored reference data. ### Claim 3 (depends on 1) The method according to claim 1, wherein the physical quantity is an angle between a middle frame and a subframe of the hooklift. ### Claim 4 (depends on 3) The method according to claim 3, wherein the angle between the middle frame and the subframe is determined with inclinometers attached to the middle frame and the subframe. ### Claim 5 (depends on 1) The method according to claim 1, wherein the physical quantity is a position of a piston rod of the main cylinder. ### Claim 6 (depends on 5) The method according to claim 5, wherein the position of the piston rod is measured with a displacement sensor attached to the main cylinder, or with a non-contact sensor arranged in connection with the main cylinder. ### Claim 7 (depends on 1) The method according to claim 1, wherein the values of the force acting on the main cylinder of the hooklift are determined by measuring, with pressure sensors, pressures in a bottom chamber and a piston rod chamber of the main cylinder, or by measuring, with a pressure sensor, a pressure in a hydraulic pump connected to the main cylinder. ### Claim 8 (depends on 1) The method according to claim 1, wherein the values of the force acting on the main cylinder of the hooklift are determined by measuring, with a strain gauge, a strain in the main cylinder. ### Claim 9 A system for determining the weight of a demountable platform, comprising: a hooklift for lifting the demountable platform from the ground onto a vehicle, means for measuring a physical quantity that varies as a function of the movement of the hooklift, means for determining, at predetermined intervals of the physical quantity, values of a force acting on a main cylinder of the hooklift, and means for calculating the weight of the demountable platform using the determined values of the force, the calculating being based on a discrete integral of the determined values of the force over the physical quantity. ### Claim 10 (depends on 9) The system according to claim 9, wherein the means for measuring the physical quantity that varies as a function of the movement of the hooklift comprises inclinometers attached to a middle frame and a subframe of the hooklift for measuring an angle between the middle frame and the subframe of the hooklift, or a displacement sensor attached to the main cylinder or a non-contact sensor arranged in connection with the main cylinder for measuring a position of a piston rod of the main cylinder. ### Claim 11 (depends on 9) The system according to claim 9, wherein the means for determining values of the force acting on the main cylinder of the hooklift comprises pressure sensors for measuring pressures in a bottom chamber and a piston rod chamber of the main cylinder, a pressure sensor for measuring a pressure in a hydraulic pump connected to the main cylinder, or a strain gauge for measuring a strain in the main cylinder.