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US 12,460,432 B2Granted
Suspension work platform hoist system
AssigneeSky Climber, LLC
InventorsGeorge M. Anasis, Robert E. Eddy, Gary E. Ingram, Jean-Francois De Smedt, Hui Li
Life of this patent
Estimating the term…
Abstract
A suspension work platform hoist system for raising and lowering a work platform is provided. The system incorporates at least one hoist attached to the work platform and in electrical communication with a hoist control system having a monitoring and diagnostic system to monitor and record at least one of a plurality of operating characteristics of the hoist. The hoist control system may further include a safety lock out system that requires authentication of an operator prior to the hoist control system causing movement of the hoist system.
Claims34
A suspended work platform system, comprising:
- a work platform;
- a rope cooperating with the work platform;
- a motor cooperating with the rope via a traction mechanism;
- a control system comprising a variable acceleration motor control system in electrical communication with the motor to control raising and lowering of the work platform, wherein:
- the variable acceleration motor control system is in electrical communication with a constant frequency input power source and the variable acceleration motor control system controls a rate at which the motor accelerates the traction mechanism thereby controlling an acceleration of the work platform as the work platform is raised so that it reaches a maximum velocity in no less than 1 second;
- the variable acceleration motor control system includes a variable frequency drive that converts the constant frequency input power source to a variable frequency power supply in electrical communication with the motor;
- the control system has a user input device designed to accept instructions to raise or lower the work platform;
- the control system monitors a load on the work platform and prevents operation of the motor if the load exceeds a predetermined maximum load value;
- and
- the control system monitors the traction mechanism and prevents operation of the motor if the traction mechanism loses traction on the rope.
7 more elements
A suspended work platform system, comprising:
- a work platform;
- a rope cooperating with the work platform;
- a motor cooperating with the rope via a traction mechanism;
- a control system comprising a variable acceleration motor control system in electrical communication with the motor to control raising and lowering of the work platform, wherein:
- the variable acceleration motor control system is in electrical communication with a constant frequency input power source and the variable acceleration motor control system controls a rate at which the motor accelerates the traction mechanism thereby controlling an acceleration of the work platform as the work platform is raised;
- the variable acceleration motor control system includes a variable frequency drive that converts the constant frequency input power source to a variable frequency power supply in electrical communication with the motor;
- the control system has a user input device designed to accept instructions to raise or lower the work platform;
- the variable acceleration motor control system includes an approach mode having an approach velocity setpoint that limits an approach velocity of the work platform to less than a maximum velocity of the work platform;
- and
- the control system monitors the traction mechanism and prevents operation of the motor if the traction mechanism loses traction on the rope.
7 more elements
A suspended work platform system, comprising:
- a work platform;
- a rope cooperating with the work platform;
- a motor cooperating with the rope via a traction mechanism;
- a control system comprising a variable acceleration motor control system in electrical communication with the motor to control raising and lowering of the work platform, wherein:
- the variable acceleration motor control system is in electrical communication with a constant frequency input power source and the variable acceleration motor control system controls a rate at which the motor accelerates the traction mechanism thereby controlling an acceleration of the work platform as the work platform is raised;
- the variable acceleration motor control system includes a variable frequency drive that converts the constant frequency input power source to a variable frequency power supply in electrical communication with the motor;
- the control system has a user input device designed to accept instructions to raise or lower the work platform and the user input device includes a hold-to-run switch requiring continuous engagement of the hold-to-run switch to raise or lower the work platform;
- and
- the control system monitors the traction mechanism and prevents operation of the motor if the traction mechanism loses traction on the rope.
6 more elements
Dependencies are inferred from the claim text.