Apparatus for detecting rammer tip-over
US9789579B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2013 |
| Grant date | Oct 17, 2017 |
| Priority date | — |
| Expiry date | Oct 15, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In an apparatus for detecting tip-over of a rammer equipped with a crankcase accommodating an output shaft rotatably connected to an engine, a movable unit accommodating a converter mechanism for converting rotation of the output shaft to vertical motion of a movable member, a tamping shoe connected to the movable unit, and a handle operable by an user, and adapted to thrust upward in the gravitational direction by the vertical motion of the movable member and go into a free fall to compact a ground surface, it is determined whether a detected engine speed becomes equal to or smaller than a threshold value set lower than an engine idling speed when the engine has been operated at a rammer working speed set greater than the engine idling speed, and if it does, it is discriminated that the rammer has tipped over.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.