1. A construction machine comprising:
a lower propelling body;
an upper slewing body slewably mounted on the lower propelling body;
a working attachment attached to the upper slewing body, the working attachment including a boom raisable and lowerable with respect to the upper slewing body, an arm swingable with respect to the boom, a boom cylinder which is a hydraulic actuator for driving the boom, and an arm cylinder which is a hydraulic actuator for driving the arm;
right and left travel motors which are hydraulic actuators for driving the lower propelling body to make the lower propelling body travel;
a slewing motor which is a hydraulic actuators for driving the upper slewing body to slew the upper slewing body;
a hydraulic actuator circuit for operating the hydraulic actuators, the hydraulic actuator circuit including a first circuit connected to a first travel motor which is one of the right and left travel motors and to the boom cylinder, a second circuit connected to a second motor which is the other of the right and left travel motors and to the arm cylinder, and a third circuit connected to the slewing motor, and each of the first to third circuits having a control valve associated with a corresponding one of the hydraulic actuators to control an operation of the hydraulic actuator;
a first pump for discharging hydraulic fluid toward the first circuit;
a second pump for discharging hydraulic fluid toward the second circuit;
and a third pump for discharging hydraulic fluid toward the third circuit, wherein:
the first travel motor is disposed on an upstreammost side in the first circuit so as to give the first travel motor a priority to be driven;
the second travel motor is disposed on an upstreammost side in the second circuit so as to give the second travel motor a priority to be driven; and
the hydraulic actuator circuit further includes a merging valve for merging hydraulic fluid discharged from the third pump toward the third circuit into each of the first and second circuits, the first merging valve having a first position for unloading the hydraulic fluid discharged from the third pump through the second circuit when none of the hydraulic actuators other than the first and second travel motors is operated, a second position for merging the hydraulic fluid discharged from the third pump into each of the first and second circuits when a double travel operation, which is an operation for simultaneously operating the first and second travel motors, and an operation on at least one of the remaining hydraulic actuators except for a boom raising operation which is an operation for raising the boom are performed, and a third position for merging the hydraulic fluid discharged from the third pump into the first circuit while blocking the hydraulic fluid from the second circuit when the boom raising operation is performed.
2. The construction machine as defined in claim 1, wherein the merging valve has an orifice which is provided in a merging passage for merging hydraulic fluid from the third pump into the first circuit when the merging valve is in the third position, the orifice being adapted to restrict a flow rate of hydraulic fluid in the merging passage so as to make a pumping pressure of the third pump be greater than a pressure of the first circuit.
3. The construction machine as defined in claim 1, wherein the merging valve is composed of a pilot controlled selector valve including a holding spring for holding the merging valve in the first position by a predetermined holding force thereof and a pilot portion for externally receiving a pilot pressure, the pilot portion adapted to receive an input of a pilot pressure which changes over the merging valve to the second position against the holding force of the holding spring, when the double travel operation which is an operation for simultaneously operating the first and second travel motors, and the operation on at least one of the remaining hydraulic actuators except for the boom raising operation which is an operation for raising the boom are performed, and to receive an input of a pilot pressure which changes over the merging valve to the third position against the holding force of the holding spring, when the boom raising operation is performed.
4. The construction machine as defined in claim 3, wherein: the pilot portion of the merging valve includes a merging selection pilot pressure input section for receiving an input of a merging selection pilot pressure which changes over the merging valve to the second position against the holding force of the holding spring and a boom raising operation pilot pressure input section for receiving an input of a boom raising operation pilot pressure which is input into the control valve for the boom cylinder so as to change over the merging valve to the third position against the holding force of the holding spring when the boom raising operation is performed, and the hydraulic actuator circuit further includes a pilot pressure input circuit for inputting the merging selection pilot pressure into the merging selection pilot pressure input section; and a pilot pressure input inhibition line for communicating the pilot pressure input circuit with a tank when none of the hydraulic actuators other than the first and second travel motors is operated to thereby inhibit the merging selection pilot pressure from being input into the merging selection pilot pressure input section.
5. A construction machine comprising:
a lower propelling body;
an upper slewing body slewably mounted on the lower propelling body;
a working attachment attached to the upper slewing body, the working attachment including a boom raisable and lowerable with respect to the upper slewing body, an arm swingable with respect to the boom, a boom cylinder which is a hydraulic actuator for driving the boom, and an arm cylinder which is a hydraulic actuator for driving the arm;
right and left travel motors which are hydraulic actuators for driving the lower propelling body to make the lower propelling body travel;
a slewing motor which is a hydraulic actuators for driving the upper slewing body to slew the upper slewing body;
a hydraulic actuator circuit for operating the hydraulic actuators, the hydraulic actuator circuit including a first circuit connected to a first travel motor which is one of the right and left travel motors and to the boom cylinder, a second circuit connected to a second motor which is the other of the right and left travel motors and to the arm cylinder, and a third circuit connected to the slewing motor, and each of the first to third circuits having a control valve associated with a corresponding one of the hydraulic actuators to control an operation of the hydraulic actuator;
a first pump for discharging hydraulic fluid toward the first circuit;
a second pump for discharging hydraulic fluid toward the second circuit;
and a third pump for discharging hydraulic fluid toward the third circuit, wherein:
the first travel motor is disposed on an upstreammost side in the first circuit so as to give the first travel motor a priority to be driven;
the second travel motor is disposed on an upstreammost side in the second circuit so as to give the second travel motor a priority to be driven; and
the hydraulic actuator circuit further includes a merging valve for merging hydraulic fluid discharged from the third pump toward the third circuit into each of the first and second circuits, the merging valve having a first position for unloading the hydraulic fluid discharged from the third pump through the second circuit when none of the hydraulic actuators other than the first and second travel motors is operated, a second position for merging the hydraulic fluid discharged from the third pump into each of the first and second circuits when a double travel operation, which is an operation for simultaneously operating the first and second travel motors, and an operation on at least one of the remaining hydraulic actuators except for a boom raising operation which is an operation for raising the boom are performed, and a third position for merging hydraulic fluid discharged from the third pump into the first circuit while blocked the hydraulic fluid from the second circuit only when both of the boom raising operation and a slewing operation by the slewing motor are performed.
6. The construction machine as defined in claim 5, wherein: the control valve for an operation on the slewing motor, which is a slewing control valve, has a bleed-off passage for introducing hydraulic fluid discharged from the third pump to the merging valve when the slewing control valve is in a neutral position thereof; the third circuit includes an unloading passage leading from the third pump to the merging valve through the bleed-off passage of the slewing control valve, and a parallel passage leading from the third pump to the merging valve while bypassing the slewing control valve; the merging valve has a plurality of input ports connected to the unloading passage and the parallel passage respectively, a first output port connected to the first circuit through a first merging line, and a second output port connected to the second circuit through a second merging line; and the merging valve is adapted to connect the first merging line to the parallel passage and connect the second merging line to the unloading passage, in the third position.
7. The construction machine as defined in claim 5, wherein the merging valve has an orifice which is provided in a merging passage for merging the hydraulic fluid from the third pump into the first circuit when the merging valve is in the third position, the orifice being adapted to restrict a flow rate of hydraulic fluid in the merging passage so as to make a pumping pressure of the third pump be greater than a pressure of the first circuit.
8. The construction machine as defined in claim 5, wherein the merging valve is composed of a pilot controlled selector valve including a holding spring for holding the merging valve in the first position by a predetermined holding force thereof and a pilot portion for externally receiving a pilot pressure, the pilot portion adapted to receive an input of a pilot pressure which changes over the merging valve to the second position against the holding force of the holding spring, when the double travel operation which is an operation for simultaneously operating the first and second travel motors, and the operation on at least one of the remaining hydraulic actuators except for the boom raising operation which is an operation for raising the boom are performed, and to receive an input of a pilot pressure which changes over the merging valve to the third position against the holding force of the holding spring when the boom raising operation is performed.
9. The construction machine as defined in claim 8, wherein: the pilot portion of the merging valve includes a merging selection pilot pressure input section for receiving an input of a merging selection pilot pressure which changes over the merging valve to the second position against the holding force of the holding spring and a boom raising operation pilot pressure input section for receiving an input of a boom raising operation pilot pressure which is input into the control valve for the boom cylinder so as to change over the merging valve to the third position against the holding force of the holding spring when the boom raising operation is performed, and the hydraulic actuator circuit further includes a pilot pressure input circuit for inputting the merging selection pilot pressure into the merging selection pilot pressure input section, and a pilot pressure input inhibition line for communicating the pilot pressure input circuit with a tank when none of the hydraulic actuators other than the first and second travel motors is operated to thereby inhibit the merging selection pilot pressure from being input into the merging selection pilot pressure input section.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A circuit device comprising:
a substrate having an insulative upper surface;
a hydrophobic anti-plating layer of a hydrophobic material formed on said upper surface of said substrate and having at least one patterned through-hole for exposing a plating portion of said upper surface of said substrate;
an active metal layer formed on said plating portion of said upper surface of said substrate and disposed in said patterned through-hole in said hydrophobic anti-plating layer; and
an electroless deposited metal layer electroless deposited on said active metal layer.
2. The circuit device of claim 1, wherein said hydrophobic anti-plating layer has an upper surface distal from said upper surface of said substrate, said electroless deposited metal layer having an upper surface substantially adjoining said upper surface of said hydrophobic anti-plating layer such that said upper surface of said electroless deposited metal layer and said upper surface of said hydrophobic anti-plating layer cooperatively form a continuous and smooth surface.
3. The circuit device of claim 1, wherein said hydrophobic material is a hydrophobic resin selected from the group consisting of polycarbonate, poly-dimethylsiloxane adipamide, polypropylene, and combinations thereof.
4. The circuit device of claim 1, wherein said hydrophobic material is a hydrophobic resin selected from the group consisting of polycarbonate having a molecular weight ranging from 1000 to 4000, poly-dimethylsiloxane adipamide having a molecular weight ranging from 1000 to 4000, polypropylene having a molecular weight ranging from 1000 to 4000, and combinations thereof.
5. The circuit device of claim 1, wherein said hydrophobic material is made from a wax material.
6. The circuit device of claim 5, wherein said wax material contains a wax and an inorganic oxide selected from the group consisting of silicon dioxide, titanium dioxide, magnesium oxide, zirconium dioxide and combinations thereof.
7. The circuit device of claim 6, wherein said wax material contains 60-95 wt % of said wax and 5-40 wt % of said inorganic oxide.
8. The circuit device of claim 6, wherein said wax has a melting point not less than 60\xb0 C.
9. The circuit device of claim 1, wherein said substrate is made from a material selected from the group consisting of polycarbonate, a combination of acryl resin and ABS resin, and a combination of polycarbonate and ABS resin.
10. The circuit device of claim 1, wherein said active metal layer is made from an active material containing an active metal selected from the group consisting of palladium, rhodium, platinum, iridium, osmium, gold, nickel, iron, and combinations thereof.
11. The circuit device of claim 1, wherein said electroless deposited metal layer is made from a metal selected from the group consisting of copper, nickel, silver, and gold.
12. A method for making a circuit device, comprising:
forming a hydrophobic anti-plating layer of a hydrophobic material on an insulative upper’surface of a substrate;
forming a patterned through-hole in the hydrophobic anti-plating layer by laser ablation such that the patterned through-hole exposes a plating portion of the upper surface of the substrate;
bringing an assembly of the substrate and the patterned hydrophobic anti-plating layer into contact with an aqueous active metal solution such that only the plating portion of the upper surface of the substrate is wetted by the aqueous active metal solution, thereby forming an active metal layer on the plating portion of the upper surface of the substrate; and
electroless depositing an electroless deposited metal layer on the active metal layer.
13. The method of claim 12, wherein the bringing of the assembly into contact with the aqueous active metal solution is performed by immersing the assembly into an aqueous active solution bath, followed by removing the assembly from the aqueous active solution bath and washing.
14. The method of claim 12, wherein said hydrophobic material is a hydrophobic resin selected from the group consisting of polycarbonate, poly-dimethylsiloxane adipamide, polypropylene, and combinations thereof.
15. The method of claim 12, wherein said hydrophobic material is a hydrophobic resin selected from the group consisting of polycarbonate having a molecular weight ranging from 1000 to 4000, poly-dimethylsiloxane adipamide having a molecular weight ranging from 1000 to 4000, polypropylene having a molecular weight ranging from 1000 to 4000, and combinations thereof.
16. The method of claim 12, wherein said hydrophobic material is a wax material.
17. The method of claim 16, wherein said wax material contains a wax and an inorganic oxide selected from the group consisting of silicon dioxide, titanium dioxide, magnesium oxide, zirconium dioxide and combinations thereof.
18. The method of claim 17, wherein said wax material contains 60-95 wt % of said wax and 5-40 wt % of said inorganic oxide.
19. The method of claim 17, wherein said wax has a melting point not less than 60\xb0 C.
20. The method of claim 12, wherein said substrate is made from a material selected from the group consisting of polycarbonate, a combination of acryl resin and ABS resin, and a combination of polycarbonate and ABS resin.
21. The method of claim 12, wherein said active metal layer is made from an active material containing an active metal selected from the group consisting of palladium, rhodium, platinum, iridium, osmium, gold, nickel, iron, and combinations thereof.
22. The method of claim 12, wherein said electroless deposited metal layer is made from a metal selected from the group consisting of copper, nickel, silver and gold.
23. The method of claim 12, wherein said hydrophobic anti-plating layer has a dark color.