Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
126 words
A tree handling device comprising a hydraulic cutting means, a rotator having a first pair of flexible hydraulic operating supply and return lines, a grapple having a second pair of flexible hydraulic operating supply and return lines, said first and second supply and return lines connected to a control valve means to control hydraulic fluid from a hydraulic source, a branch line connected to the second supply line, the branch line having a pressure sensitive valve to supply fluid pressure to the hydraulic cutting means, the rotator and grapple being operable and the pressure-sensing valve being closed at a first hydraulic pressure from the hydraulic source, and a means to increase the hydraulic pressure whereby the pressure sensing valve opens to drive the hydraulic cutting means.
Claim 2
Dependent Claim
126 words
A tree handling device comprising a hydraulic cutting means, a rotator having a first pair of flexible hydraulic operating supply and return lines, a grapple having a second pair of flexible hydraulic operating supply and return lines, said first and second supply and return lines connected to a control valve means to control hydraulic fluid from a hydraulic source, a branch line connected to the second supply line, the branch line having a pressure sensitive valve to supply fluid pressure to the hydraulic cutting means, the rotator and grapple being operable and the pressure-sensing valve being closed at a first hydraulic pressure from the hydraulic source, and a means to increase the hydraulic pressure whereby the pressure sensing valve opens to drive the hydraulic cutting means.
Claim 3
Dependent Claim
56 words
A tree handling device according to claim 1 wherein said second supply line includes a pilot control check valve capable of being actuated by a gripping action of the grapple to maintain said gripping action during a cutting operation of the hydraulic cutting means, the pilot control check valve being situated downstream of the branch line.
Claim 4
Dependent Claim
72 words
A tree handling device according to claim 1 wherein a pair of third fluid return lines are connected from said second return line to the first fluid supply and return lines, check valves being provided in said third return lines to allow fluid to flow to the first supply and return lines, the third fluid return lines being provided to accelerate a return flow from said cutting means to a hydraulic reservoir.
Claim 5
Dependent Claim
58 words
A tree handling device according to claim 1 wherein a fourth pair of fluid return lines are connected to said first supply and return lines, the fourth pair of fluid lines having check valves to allow fluid to flow from the first supply and return lines to a hydraulic reservoir to accelerate fluid return from the cutting means.
Claim 6
Dependent Claim
145 words
A tree handling device comprising a grapple for gripping logs, a rotator for rotating the grapple, the rotator having a first pair of flexible hydrualic operating supply and return lines, the grapple having a second pair of flexible hydraulic operating supply and return lines, said first and second supply and return lines being connected to a control valve means to control hydraulic fluid from a hydraulic source, a branch line connected to the second supply line and having a pressure sensitive valve, the branch line supplying fluid to a hydraulic cross-cutting means capable of cutting logs held in said grapple, the rotator and grapple being operable and said pressure-sensitive valve being closed at a first hydraulic operating pressure, the device further comprising a means to increase said operating pressure whereby the pressure sensing valve opens allowing fluid to flow to drive the hydraulic cross-cutting means.
Claim 7
Dependent Claim
145 words
A tree handling device comprising a grapple for gripping logs, a rotator for rotating the grapple, the rotator having a first pair of flexible hydrualic operating supply and return lines, the grapple having a second pair of flexible hydraulic operating supply and return lines, said first and second supply and return lines being connected to a control valve means to control hydraulic fluid from a hydraulic source, a branch line connected to the second supply line and having a pressure sensitive valve, the branch line supplying fluid to a hydraulic cross-cutting means capable of cutting logs held in said grapple, the rotator and grapple being operable and said pressure-sensitive valve being closed at a first hydraulic operating pressure, the device further comprising a means to increase said operating pressure whereby the pressure sensing valve opens allowing fluid to flow to drive the hydraulic cross-cutting means.