US 12,460,432 B2
Suspension work platform hoist system
George M. Anasis, New Albany, OH (US); Robert E. Eddy, Johnstown, OH (US); Gary E. Ingram, Lady Lake, FL (US); Jean-Francois De Smedt, Herbais (BE); and Hui Li, Columbus, OH (US)
Assigned to SKY CLIMBER, LLC, Delaware, OH (US)
Filed by Sky Climber, LLC, Delaware, OH (US)
Filed on Mar. 29, 2021, as Appl. No. 17/214,988.
Application 17/214,988 is a continuation of application No. 15/988,100, filed on May 24, 2018, granted, now 10,961,725.
Application 15/988,100 is a continuation of application No. 14/611,477, filed on Feb. 2, 2015, granted, now 9,982,443, issued on May 29, 2018.
Application 14/611,477 is a continuation of application No. 13/150,608, filed on Jun. 1, 2011, granted, now 8,944,217, issued on Feb. 3, 2015.
Application 13/150,608 is a continuation in part of application No. 12/946,398, filed on Nov. 15, 2010, granted, now 8,403,112, issued on Mar. 26, 2013.
Application 12/946,398 is a continuation in part of application No. 12/582,445, filed on Oct. 20, 2009, granted, now 7,849,971, issued on Dec. 14, 2010.
Application 12/582,445 is a continuation of application No. 11/267,629, filed on Nov. 4, 2005, granted, now 7,631,730, issued on Dec. 15, 2009.
Prior Publication US 2021/0270047 A1, Sep. 2, 2021
Int. Cl. E04G 3/32 (2006.01); B66D 1/46 (2006.01); B66D 1/60 (2006.01); B66D 1/74 (2006.01); E04G 3/28 (2006.01)
CPC E04G 3/32 (2013.01) [B66D 1/46 (2013.01); B66D 1/605 (2013.01); B66D 1/7489 (2013.01); E04G 2003/286 (2013.01)] 34 Claims
OG exemplary drawing
 
1. 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.