Truck-mounted concrete pump and protective circuit therefor
US9856661B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2016 |
| Grant date | Jan 2, 2018 |
| Priority date | — |
| Expiry date | Jul 11, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04G21/0445
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
This disclosure relates to a truck-mounted concrete pump including a vehicle, a concrete distributor boom disposed on the vehicle and including multiple boom arms that can be stowed, in the form of an arm assembly, on a vehicle-mounted boom resting unit, and a boom hydraulic system configured to stow and unfold the arm assembly and including a hydraulic cylinder that moves the arm assembly against the boom resting unit in a stowing movement. To terminate the boom stowing movement, a protective circuit is coupled to the hydraulic cylinder. The protective circuit includes a switching unit actuable under the load of the arm assembly. The switching unit has a load receiving element arranged on the boom resting unit that is resiliently deformable when stowing the arm assembly, wherein the arm assembly is only supported on the boom resting unit by the load receiving element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.