Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
176 words
A remote-control device for hydraulic crane comprising, a hydraulic oil reservoir; a hydraulic pump connected to said hydraulic oil reservoir; a hydraulic oil feed-return circuit connected to said hydraulic pump and said hydraulic oil reservoir; a derrick cylinder, a boom telescoping cylinder, a winch motor, and a swivel motor, said cylinders and said motors being connected in parallel to said hydraulic oil feed-return circuit through operation-selecting solenoid valves; a proportional solenoid relief valve connecting to a discharge side of said hydraulic pump to said hydraulic oil reservoir so as to shunt said hydraulic pump; and an operating terminal equipment related to a crane body, said operating terminal equipment having operation-selecting switches electrically connected to said operation-selecting solenoid valves, respectively, and a potentiometer electrically connected to said proportional solenoid relief valve, whereby control velocity of different parts of the hydraulic crane is controlled by selectively actuating different crane parts inclusive of said derrick cylinder, said boom telescoping cylinder, said winch motor, and said swivel motor, thereby regulating flow of.the hydraulic oil with said proportional solenoid relief valve.
Claim 2
Dependent Claim
176 words
A remote-control device for hydraulic crane comprising, a hydraulic oil reservoir; a hydraulic pump connected to said hydraulic oil reservoir; a hydraulic oil feed-return circuit connected to said hydraulic pump and said hydraulic oil reservoir; a derrick cylinder, a boom telescoping cylinder, a winch motor, and a swivel motor, said cylinders and said motors being connected in parallel to said hydraulic oil feed-return circuit through operation-selecting solenoid valves; a proportional solenoid relief valve connecting to a discharge side of said hydraulic pump to said hydraulic oil reservoir so as to shunt said hydraulic pump; and an operating terminal equipment related to a crane body, said operating terminal equipment having operation-selecting switches electrically connected to said operation-selecting solenoid valves, respectively, and a potentiometer electrically connected to said proportional solenoid relief valve, whereby control velocity of different parts of the hydraulic crane is controlled by selectively actuating different crane parts inclusive of said derrick cylinder, said boom telescoping cylinder, said winch motor, and said swivel motor, thereby regulating flow of.the hydraulic oil with said proportional solenoid relief valve.
Claim 3
Dependent Claim
181 words
A device as defined in claim 1, wherein the device is characterized in that said operation-selecting solenoid valve has a main valve casing, and a main pool is slidably fitted in a valve bore of said main valve casing, said main pool having a land dividing said valve bore into a pressure chamber and a pilot pressure chamber, said pressure chamber having a port connected to the discharge side of said hydraulic pump and an exhaust port connected to said hydraulic oil reservoir, said main pool being biased so as to normally close said exhaust port by a valve actuating end thereof, said pilot pressure chamber being connected to said hydraulic oil reservoir through a pilot valve, said pilot valve being so formed as to close a valve opening thereof by an actuating rod connected to a movable coil operatively related to a magnet, said movable coil being connected to said potentiometer so as to receive an output current therefrom, said actuating rod being acted by a valve closing force which is proportionate to said output current from said potentiometer. «
Claim 4
Dependent Claim
99 words
A device as defined in claim 1, wherein the device is characterized in that said operating terminal equipment is provided with a handle portion, a switch board extending upwardly from forward end of the handle portion substantially at right angles thereto, and a potentiometer housing disposed at a lower portion of said forward end of the handle portion, said switch board having said operation-selecting switches disposed thereon along a rectilinear line, said potentiometer housing journaling a velocity-control trigger so as to be able to rotate said potentiometer and to project a part of the trigger below said handle portion.