초록 ▼

The hydraulic flotation circuit for the header of a windrower or other harvester utilizes a pair of precharged gas accumulators that are always in open communication with the flotation cylinders of the circuit. One of the accumulators is set at a relatively high precharge pressure, while the other i

The hydraulic flotation circuit for the header of a windrower or other harvester utilizes a pair of precharged gas accumulators that are always in open communication with the flotation cylinders of the circuit. One of the accumulators is set at a relatively high precharge pressure, while the other is set at a much lower precharge pressure. If the header chosen for attachment to the harvester is relatively heavy, the accumulator with the higher precharge pressure provides the flotation bias, while if the header is relatively light, the accumulator having the lower precharge pressure comes into play.

대표청구항 ▼

[ I claim:] [1.] In a farm implement having a hydraulic flotation circuit that can be used to floatingly support one of a plurality of headers of substantially different weights when the one header is attached to a frame of the implement, the improvement comprising:at least one flotation cylinder in

[ I claim:] [1.] In a farm implement having a hydraulic flotation circuit that can be used to floatingly support one of a plurality of headers of substantially different weights when the one header is attached to a frame of the implement, the improvement comprising:at least one flotation cylinder in the circuit operably connectable between the frame and the header for exerting an upward force against the header;a pressurizing path in the circuit connected to the at least one flotation cylinder in a manner to trap a volume of pressurized fluid in the at least one flotation cylinder;a first precharged accumulator in the circuit in fluid communication with said pressurizing path; anda second precharged accumulator in the circuit in fluid communication with said pressurizing path,said second accumulator being precharged at a substantially lower pressure than the first accumulator whereby the circuit may provide flotation support for any one of the plurality of headers.