Low pressure warning for hydraulic system of platform float suspension
US5633452A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1996 |
| Grant date | May 27, 1997 |
| Priority date | — |
| Expiry date | Mar 29, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01D41/145
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An agricultural implement includes a header or platform suspended from a main frame by a suspension permitting movement of the header between a lowered working position and a raised transport position. The suspension includes single-acting float cylinders and a single-acting lift cylinder controlled by an electrohydraulic control system including a programmable microprocessor in which a signal representative of a minimum acceptable float pressure may be set. The microprocessor contains an electronic switch that couples a warning device lead to ground to effect energization of the warning device in response to the microprocessor receiving an electronic signal representative of a float circuit pressure below the minimum acceptable float pressure. In one embodiment, the microprocessor contains a timing device which is triggered whenever a control switch is connected to energize a "lower" signal lead the timing device being set to time out when sufficient time has elapsed to ensure that the header has reached its working position. The timing device works to suppress the signal representative of the float circuit pressure so that a premature energization of the warning device does not o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.