초록 ▼

A working vehicle 1 includes front wheels Wf steered by a steering wheel 8, and rear wheels Wr driven through a transmission system T incorporating static hydraulic pressure type continuously variable transmissions. A speed change operating device M for controlling speed change of the transmission s

A working vehicle 1 includes front wheels Wf steered by a steering wheel 8, and rear wheels Wr driven through a transmission system T incorporating static hydraulic pressure type continuously variable transmissions. A speed change operating device M for controlling speed change of the transmission system T accelerates or decelerates right and left rear wheels Wr at same rotating speed by operation of a change lever 10, and also generates a difference in rotating speed between the right and left rear wheels Wr by operation of the steering wheel 8. The steering characteristic on the basis of operation of the steering wheel 8 varies depending on the vehicle speed set by the change lever 10, so that an appropriate steering characteristic may be obtained if the vehicle speed is changed.

대표청구항 ▼

A working vehicle 1 includes front wheels Wf steered by a steering wheel 8, and rear wheels Wr driven through a transmission system T incorporating static hydraulic pressure type continuously variable transmissions. A speed change operating device M for controlling speed change of the transmission s

A working vehicle 1 includes front wheels Wf steered by a steering wheel 8, and rear wheels Wr driven through a transmission system T incorporating static hydraulic pressure type continuously variable transmissions. A speed change operating device M for controlling speed change of the transmission system T accelerates or decelerates right and left rear wheels Wr at same rotating speed by operation of a change lever 10, and also generates a difference in rotating speed between the right and left rear wheels Wr by operation of the steering wheel 8. The steering characteristic on the basis of operation of the steering wheel 8 varies depending on the vehicle speed set by the change lever 10, so that an appropriate steering characteristic may be obtained if the vehicle speed is changed. ting a portion of the material with the heat applied to the elongated conduit. 15. The method of claim 13, further comprising thermally degrading a portion of the material with the heat applied to the elongated conduit. 16. The method of claim 13, wherein the heat applied to the elongated conduit facilitates oxidation of at least a portion of the material blocking the openings. 17. The method of claim 13, further comprising pulling a vacuum within the elongated conduit to draw fluid into the elongated conduit when openings of the elongated conduit are opened. 18. The method of claim 13, further comprising consolidating packing or soil adjacent to the elongated conduit with thermally degraded material from the openings. 19. The method of claim 13, wherein the material comprises a polymer. 20. The method of claim 13, wherein the material comprises a metal. 21. The method of claim 13, wherein the material comprises a hydrocarbon. 22. The method of claim 13, wherein the openings in the elongated conduit comprise slits in the conduit, and wherein long axes of the slits are oriented substantially parallel to a longitudinal axis of the elongated conduit. 23. A method of establishing an elongated conduit that allows for flow of fluid into or out of soil to be remediated, comprising: applying heat to the soil from at least one well external to the elongated conduit; wherein applying heat to the soil comprises heating the at least one well, and transferring heat from the at least one well to the soil; and exposing openings in the elongated conduit by removing a sleeve abutting the elongated conduit that blocks the openings with heat supplied from the at least one well, wherein the sleeve is placed in a position to block the openings before insertion of the elongated conduit into the soil. 24. The method of claim 23, wherein exposing the openings comprises melting at least a portion of the sleeve. 25. The method of claim 23, wherein exposing the openings comprises thermally degrading a portion of the sleeve. 26. The method of claim 23, wherein the heat applied to the soil facilitates oxidation of at least a portion of sleeve. 27. The method of claim 23, wherein applying heat to soil comprises introducing steam into the soil from the at least one well. 28. The method of claim 23, further comprising pulling a vacuum within the elongated conduit to draw fluid into the elongated conduit when openings of the elongated conduit are exposed. 29. The method of claim 23, further comprising consolidating packing or soil adjacent to the elongated conduit with melted material from the sleeve. 30. The method of claim 23, further comprising consolidating packing or soil adjacent to the elongated conduit with thermally degraded material from the sleeve. 31. The method of claim 23, wherein the sleeve is positioned against an inner wall of the elongated conduit. 32. The method of claim 23, wherein the sleeve is positioned against an outer wall of the conduit. 33. The method of claim 23, wherein the sleeve comprises a metal. 34. The method of claim 23, wherein the sleeve comprises a polymer. 35. The method of claim 23, wherein the sleeve comprises a hydrocarbon. 36. The method of claim 23, wherein the openings in the elongated conduit comprise slits in the conduit, and wherein long axes of the slits are oriented substantially parallel to a longitudinal axis of the elongated conduit. 37. A method of establishing an elongated conduit that allows for flow of fluid into or out of soil to be remediated, comprising: applying an electrical current to the elongated conduit to resistively heat the conduit; wherein heat applied to the elongated conduit by resistive heating at least partially removes a sleeve that blocks openings in the elongated conduit to open the elongated conduit to allow fluid flow into or out of the elongated conduit, and wherein the sleeve is positioned to block the openings before the elongated conduit is inserted into the soil; and consolidating packing or soil adjacent to the elongated conduit with melted material from the sleeve. 38. The method of claim 37, further comprising melting a portion of the sleeve with the heat applied to the elongated conduit. 39. The method of claim 37, further comprising thermally degrading a portion of the sleeve with the heat applied to the elongated conduit. 40. The method of claim 37, wherein the heat applied to the elongated conduit facilitates oxidation of at least a portion of the sleeve. 41. The method of claim 37, further comprising pulling a vacuum within the elongated conduit to draw fluid into the elongated conduit when openings of the elongated conduit are opened. 42. The method of claim 37, further comprising consolidating packing or soil adjacent to the elongated conduit with thermally degraded material from the sleeve. 43. The method of claim 37, wherein the sleeve comprises a metal. 44. The method of claim 37, wherein the sleeve comprises a polymer. 45. The method of claim 37, wherein the openings in the elongated conduit comprise slits in the conduit, and wherein long axes of the slits are oriented substantially parallel to a longitudinal axis of the elongated conduit. 46. A method of establishing an elongated conduit that allows for flow of fluid into or out of soil to be remediated, comprising: introducing a chemical into the soil from one or more wells adjacent to the elongated conduit; contacting the elongated conduit with a portion of the chemical to react the chemical with material placed in openings in the elongated conduit, wherein the material is placed in the openings before insertion of the conduit into the soil; wherein the reaction between the chemical and the material at least partially removes some of the material from the openings to open the elongated conduit to fluid flow into or out of the elongated conduit; and consolidating packing or soil adjacent to the elongated conduit with melted material from the sleeve. 47. The method of claim 46, wherein the chemical is a solvent for the material in the openings. 48. The method of claim 46, wherein the chemical chemically reacts with the material in the openings to at least partially decompose the material. 49. The method of claim 46, wherein the chemical oxidizes at least a portion of the material in the openings. 50. The method of claim 46, wherein the chemical comprises an acid that decomposes at least a portion of the material in the openings. 51. The method of claim 46, wherein the chemical comprises a base that decomposes at least a portion of the material in the openings. 52. The method of claim 46, further comprising pulling a vacuum within the elongated conduit to draw fluid into the elongated conduit when one or more openings of the elongated conduit are opened. 53. The method of claim 46, further comprising consolidating packing or soil adjacent to the elongated conduit with chemically degraded material from the openings. 54. The method of claim 46, wherein the material comprises a hydrocarbon. 55. The method of claim 46, wherein the material comprises a polymer. 56. The method of claim 46, wherein the material comprises a metal. 57. The method of claim 46, wherein the material comprises a salt. 58. The method of claim 49, wherein the openings in the elongated conduit comprise slits in the conduit, and wherein long axes of the slits are oriented substantially parallel to a longitudinal axis of the elongated conduit. 59. A method of establishing an elongated conduit that allows for flow of fluid into or out of soil to be remediated, comprising: introducing a chemical into the soil from one or more wells adjacent to the elongated conduit; contacting a sleeve that blocks openings of the elongated conduit with a portion of the chemical to react the chemical with the sleeve and expose at least some of the openings, wherein the sleeve is positioned to block the openings before the elongated conduit is inserted into the soi