Implement with active wing down force and wing lift sequencing

Details Implement with active wing down force and wing lift sequencing Implement with active wing down force and wing lift sequencing

2011-04-05

2011-04-05

Pezzuto, Robert E (Department: 3671)

Earth working

Automatic power control

C172S452000

Reexamination Certificate

active

07918285

ABSTRACT:
A hydraulic latching circuit is provided that allows a load-sense power source to be activated and deactivated depending on the SCV function. The load sense power source is activated when the wing cylinders are fully extended to maintain proper down force on the wings. It remains activated or latched when the SCV is returned to neutral. It is deactivated or unlatched when the wing cylinders are retracted. Two circuits have been devised to accomplish this latching function. Both of these latching circuits can be used with the sequencing circuit.

REFERENCES:
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patent: 5303779 (1994-04-01), Friggstad
patent: 6035943 (2000-03-01), Gerein et al.
patent: 6068063 (2000-05-01), Mayerle et al.
patent: 6318477 (2001-11-01), Bettin
patent: 6698523 (2004-03-01), Barber
patent: 7478683 (2009-01-01), Peck et al.
patent: 2010/0078185 (2010-04-01), Carlz

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