Crane
US10150657B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 2, 2017 |
| Grant date | Dec 11, 2018 |
| Priority date | — |
| Expiry date | Jun 29, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C23/36
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The crane includes a swing brake device installed between a hydraulic motor and a control valve and having a flow restrictor; a first backpressure detector detecting a motor backpressure between the flow restrictor and one of ports of the hydraulic motor; a second backpressure detector detecting a motor backpressure between the flow restrictor and the other port of the hydraulic motor; and a control device. The control device has an external-force direction estimation unit that estimates a swing direction of an upperstructure under an external force acting on the upperstructure on the basis of a motor backpressure detected by the first backpuressure detector and a motor backpressure detected by the second backpressure during an operating state of the swing brake device. The control device has a notification control unit that causes the notification device to provide notification of the estimated swing direction of the upperstructure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.