公开(公告)号：WO2021150893A1

公开(公告)日：2021-07-29

申请号：PCT/US2021/014616

申请日：2021-01-22

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： POST, Matthew ,  LLOYD, Isabel M. ,  MUECKL, Gareth ,  SCOTT, John S. ,  THURIN, Matthew N. ,  CAMPBELL, Timothy J. ,  LAMBERT, Jonathan L. ,  WEKWERT, James

IPC: B66D1/48 ,  B66D1/12 ,  B66D1/60 ,  B66C13/16 ,  B66C13/24

Abstract: A zero-gravity hoist system including a chain fall, a motor coupled to the chain fall and configured to drive the chain fall in one or more directions, a power supply configured to provide power to the motor, and a controller having one or more electronic processors. The one or more electronic processors are configured to measure a first force of a load in response to receiving an input, store the measured first force in a memory of the controller, measure a second force of the load, determine a difference between the second measured force and the first measured force, and adjust a height of the load based on determining that the second force differs from the first force by a predetermined threshold.