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In a driving tool, an air tank 103 is coupled via a pressure reducing valve 104 to a rear end of a handle portion 102 which is disposed substantially perpendicularly to an approximately cylindrical output section 101, and the air tank 103 is configured by: a vertical portion 103a which protrudes in

In a driving tool, an air tank 103 is coupled via a pressure reducing valve 104 to a rear end of a handle portion 102 which is disposed substantially perpendicularly to an approximately cylindrical output section 101, and the air tank 103 is configured by: a vertical portion 103a which protrudes in the rear side of the handle section 102; and a horizontal portion 103b which extends in substantially parallel with the handle section 102, whereby the center of gravity 140 of the whole tool is positioned in the vicinity of a gripping portion 130, so that the weight balance is improved and the dimensions are reduced.

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In a driving tool, an air tank 103 is coupled via a pressure reducing valve 104 to a rear end of a handle portion 102 which is disposed substantially perpendicularly to an approximately cylindrical output section 101, and the air tank 103 is configured by: a vertical portion 103a which protrudes in

In a driving tool, an air tank 103 is coupled via a pressure reducing valve 104 to a rear end of a handle portion 102 which is disposed substantially perpendicularly to an approximately cylindrical output section 101, and the air tank 103 is configured by: a vertical portion 103a which protrudes in the rear side of the handle section 102; and a horizontal portion 103b which extends in substantially parallel with the handle section 102, whereby the center of gravity 140 of the whole tool is positioned in the vicinity of a gripping portion 130, so that the weight balance is improved and the dimensions are reduced. on to the interior of the cup only when the cup is horizontal. 6. The lid of claim 4, wherein said return surface comprises said barrier. 7. The lid of claim 1, wherein said edge is an upper edge of said second component such that said perimeter of said spill opening is defined only in part by said second component. 8. The lid of claim 7, wherein said transfer structure comprises an extension of said spillover chamber to said sip opening, said extension being isolated from the interior of the cup by a wall and said wall comprising said barrier. 9. The lid of claim 8, wherein said perimeter of said spill opening is defined by said upper edge of said second component and an outer surface of said first component. 10. The lid of claim 1, wherein said first and second components are manufactured separately and then connected by a selected one of a clip-on process and thermal welding. 11. The lid of claim 1, wherein said first component includes at least one support in contact with said second component for imparting rigidity to said first component. 12. The lid of claim 1, wherein said first component includes a double arched formation which, in conjunction with said second component, defines a pathway through which spillover liquid transfers to said spillover chamber, said formation being comprised of a plurality of arches, where adjacent walls of said arches merge at their bottoms to form a bearing tip that rests directly over the rim of the cup. 13. A lid for a cup, the cup having an outermost perimeter defining a farthest horizontal extent of an interior of the cup in its upright orientation, said lid comprising: an upper component having a sip opening positioned on said upper component to be accessible for sipping therefrom by a user when said lid is mounted on the cup and the cup is tipped toward said sip opening; and a lower component having an edge defining at least a portion of a perimeter of a spill opening and a spillover chamber open to said spill opening, wherein said spillover chamber is positioned on said lid so as to be substantially entirely horizontally outside of the outermost perimeter of the cup when said lid is mounted on the cup, and wherein, when said lower component is attached to said upper component with said spill opening substantially spaced peripherally from said sip opening, said upper component and said lower component define a cavity therebetween allowing liquid to flow in a selected one only of first and second paths depending upon a tipping direction of said lid, wherein said first path is from said spill opening to said spillover chamber and said second path is from said spillover chamber to said sip opening. 14. The lid of claim 13, wherein said sip opening is diametrically opposed to said spill opening. 15. The lid of claim 13, wherein said lid further comprises an extension of said spillover chamber toward said sip opening, said extension being open to the interior of the cup, and a return surface sloping downwardly from said extension toward said spill opening to return any excess liquid from said transfer structure to the interior of the cup, said second path extending through said extension. 16. The lid of claim 15, wherein said return surface slopes downwardly at an angle small enough that said return surface returns liquid from said extension to the interior of the cup only when the cup is horizontal. 17. The lid of claim 15, wherein said return surface comprises a barrier preventing transfer of liquid from with the cup to said sip opening without passing through said spillover chamber in any tipping position of the cup. 18. The lid of claim 13, wherein said lid further comprises an extension of said spillover chamber to said sip opening, said extension being isolated from the interior of the cup by a wall and said wall comprising a barrier preventing transfer of liquid from the interior of the cup to said sip opening without passing through said spillover chamber in any tipping p osition of the cup, said second path extending through said extension. 19. The lid of claim 13, wherein said upper and lower components are manufactured separately and then connected by a selected one of a clip-on process and thermal welding. 20. The lid of claim 13, wherein said upper and lower components are manufactured as one unit by an injection process. 21. The lid of claim 13, wherein said upper component includes at least one support imparting rigidity to said first component. 22. A method of drinking from a cup with a rim having a lid mounted thereon, the cup further having an outermost perimeter defining a farthest horizontal extent of an interior of the cup in its upright position, wherein the lid comprises a first component having a sip opening, the sip opening being located on the first component so as to be adjacent the rim of the cup when the lid is mounted on the cup to be accessible for sipping therefrom by a user when the cup is tipped toward the sip opening, a second component having an edge defining at least a portion of a perimeter of a spill opening, the spill opening being spaced from the sip opening substantially along a line corresponding to a diameter of the rim of the cup when the lid is mounted on the cup, a spillover chamber connected to the second component so as to receive liquid from the interior of the cup through the spill opening when the cup is tipped toward the spill opening, the spillover chamber being substantially entirely horizontally outside of the outermost perimeter of the cup when the lid is mounted on the cup, and a transfer structure providing a path to transfer liquid from the spillover chamber to the sip opening when the cup is tipped toward the sip opening, the transfer structure including a barrier to prevent transfer of liquid from the interior of the cup to the sip opening without passing through the spillover chamber in any tipping position of the cup, said method comprising the steps of: first tipping the cup in a direction toward the spill opening so that liquid in the interior of the cup flows through the spill opening into the spillover chamber; and subsequently tipping the cup in a direction toward the sip opening so that liquid in the spillover chamber flows through the transfer structure to the sip opening. 23. A method of drinking from a cup having a lid mounted thereon, the cup having an outermost perimeter defining a farthest horizontal extent of an interior of the cup in its upright orientation, wherein the lid comprises an upper component having a sip opening positioned on the upper component to be accessible for sipping therefrom by a user when the lid is mounted on the cup and the cup is tipped toward the sip opening, and a lower component having an edge defining at least a portion of a perimeter of a spill opening and a spillover chamber open to the spill opening, wherein the spillover chamber is positioned on the lid so as to be substantially entirely horizontally outside of the outermost perimeter when the lid is mounted on the cup, and wherein, when the lower component is attached to the upper component with the spill opening substantially spaced peripherally from the sip opening, the upper component and the lower component define a cavity therebetween allowing liquid to flow in a selected one only of first and second paths depending upon a tipping direction of the lid, wherein the first path is from the spill opening to the spillover chamber and the second path is from the spillover chamber to the sip opening, said method comprising the steps of: first tipping the cup in a direction toward the spill opening so that liquid in the interior of the cup flows through the spill opening into the spillover chamber; and subsequently tipping the cup in a direction toward the sip opening so that liquid in the spillover chamber flows through the cavity to the sip opening. 24. A combination of a cup and a lid, said cup having a rim and an outermost p erimeter defining a farthest horizontal extent of an interior of said cup, and said lid comprising: a first component having a sip opening, said sip opening being located on said first component so as to be adjacent the rim of said cup when said lid is mounted on said cup to be accessible for sipping therefrom by a user when said cup is tilted toward said sip opening; a second component having an edge defining at least a portion of a perimeter of a spill opening, said spill opening being spaced from said sip opening substantially along a line corresponding to a diameter of said rim of said cup when said lid is mounted on said cup; a spillover chamber connected to said second component so as to receive liquid from said interior of said cup through said spill opening when said cup is tipped toward said spill opening, said spillover chamber being substantially entirely horizontally outside of said outermost perimeter when said lid is mounted on said cup; and a transfer structure providing a path to transfer liquid from said spillover chamber to said sip opening when said cup is tipped toward said sip opening, said transfer structure including a barrier to prevent transfer of liquid from said interior of said cup to said sip opening without passing through said spillover chamber in any tipping position of said cup. 25. A combination of a cup and a lid, said cup having an outermost perimeter defining a farthest horizontal extent of an interior of said cup, wherein said lid comprises: an upper component having a sip opening positioned on said upper component to be accessible for sipping therefrom by a user when said lid is mounted on said cup and said cup is tipped toward said sip opening; and a lower component having an edge defining at least a portion of a perimeter of a spill opening and a spillover chamber open to said spill opening, wherein said spillover chamber is positioned on said lid so as to be substantially horizontally outside of said outermost perimeter when said lid is mounted on said cup, and wherein, when said lower component is attached to said upper component with said spill opening substantially spaced peripherally from said sip opening, said upper component and said lower component define a cavity therebetween allowing liquid to flow in a selected one only of first and second paths depending upon a tipping direction of said lid, wherein said first path is from said spill opening to said spillover chamber and said second path is from said spillover chamber to said sip opening. 26. A lid for a cup, the cup having an outermost perimeter defining a farthest horizontal extent of an interior of the cup in its upright orientation, said lid comprising: a component having a sip opening positioned on said component to be accessible for sipping therefrom by a user when said lid is mounted on the cup and the cup is tipped toward said sip opening; a spillover chamber for receiving liquid from the interior of the cup when the cup is tipped in a direction away from said sip opening, said spillover chamber being substantially entirely horizontally outside of the outermost perimeter when said lid is mounted on the cup to enable a temperature change of liquid within said spillover chamber faster than a temperature change of liquid in the interior of the cup; and a transfer structure providing a path to transfer liquid from said spillover chamber to said sip opening when the cup is tipped toward said sip opening. 27. The lid of claim 26, wherein said transfer structure includes a barrier to prevent transfer of liquid from the interior of the cup to said sip opening without passing through said spillover chamber in any tipping position of the cup. 28. A combination of a lid and a cup, said cup having an outermost perimeter defining a farthest horizontal extent of an interior of said cup in its upright orientation, said lid comprising: a component having a sip opening positioned on said component to be acce