1. A portable electronic device, comprising a first cover, a second cover and a connecting mechanism connecting the first cover with the second cover, the connecting mechanism comprising:
a fixing base, fixed on the first cover;
a turning base, fixed on the second cover;
a first linking board, rotatably connected to the fixing base and the turning base;
a second linking board, rotatably connected to the fixing base and the turning base, and collectively forming a four-bar linkage mechanism with the fixing base, the first linking board and the turning base; and
an arc spring, urged between the second linking board and the fixing base, to supply an elastic force to the four-bar linkage mechanism to open or close the second cover.
2. The portable electronic device as claimed in claim 1, wherein the fixing base comprises a first fixing base fixed on the first cover, and defines a first shaft hole and a second shaft hole at two opposite side edges of the first fixing base, the first linking board defines a first shaft hole and a fifth shaft hole at two opposite side edges of the first linking board, a pin roll is inserted into the first shaft hole of the first fixing base and the first shaft hole of the first linking board to rotatably connect one end of the first linking board with one end of the first fixing base.
3. The portable electronic device as claimed in claim 2, wherein the turning base defines a fourth shaft hole and a fifth shaft hole at two opposite side edges of the turning base, a pin roll is inserted into the fifth shaft hole of the turning base and the fifth shaft hole of the first linking board to rotatably connect the other end of the first linking board with one end of the turning base.
4. The portable electronic device as claimed in claim 3, wherein the second linking board comprises a second connecting base, and defines a second shaft hole and a fourth shaft hole at two opposite side edges of the second connecting base, a pin roll is inserted into the second shaft hole of the first fixing base and the second shaft hole of the second connecting base to rotatably connecting the other end of the first fixing base with one end of the second connecting base, a pin roll is inserted into the fourth shaft hole of the turning base and the fourth shaft hole of the second connecting base to rotatably connecting the other end of the turning base with the other end of the second connecting base.
5. The portable electronic device as claimed in claim 4, wherein a distance between the first shaft hole and the fifth shaft hole of the first linking board is shorter than that between the second shaft hole and the fourth shaft hole of the second linking board.
6. The portable electronic device as claimed in claim 4, wherein the fixing base further comprises a first adjusting base protruding outwardly from the first fixing base, the first adjusting base is configured between the first shaft hole and the second shaft hole of the first fixing base, and defines a third shaft hole engaging with the arc spring to connect the arc spring with the fixing base.
7. The portable electronic device as claimed in claim 6, wherein central lines of the first shaft hole, the second shaft hole and the third shaft hole of the fixing base are in parallel with each other and in a same plane.
8. The portable electronic device as claimed in claim 6, wherein the first fixing base is integrally formed with the first adjust base.
9. The portable electronic device as claimed in claim 6, wherein the second linking board further comprises a second adjusting base extending from the second connecting base, the second adjusting base defines a sixth shaft hole at an end edge of the second adjusting base away from the second connecting base, the sixth shaft hole engages with the arc spring to connect the arc spring with the second linking board.
10. The portable electronic device as claimed in claim 9, wherein the second linking board further defines a receiving groove to receive the arc spring, the receiving groove extends from the second connecting base towards the second adjusting base and communicates with the sixth shaft hole, one end of the arc spring passes through the receiving groove to engage with the sixth shaft hole.
11. The portable electronic device as claimed in claim 9, wherein central lines of the second shaft hole, the fourth shaft hole and the sixth shaft hole of the second linking board are parallel with each other.
12. The portable electronic device as claimed in claim 9, wherein the second connecting base is integrally formed with the second adjusting base.
13. The portable electronic device as claimed in claim 9, wherein the second linking board is substantially a tabulate plat to be form as an L-shape.
14. The portable electronic device as claimed in claim 6, wherein the first cover defines a receiving recess contiguous with the first adjusting base and the arc spring, in a close state, the turning base is in parallel with the fixing base, and the arc spring is compressed with one end above the receiving recess.
15. The portable electronic device as claimed in claim 14, wherein in a pre-opening state, the first linking board and the second linking board rotate relative to the fixing base, the arc spring is stretched to maximum deformation, and the end of the arc spring moves towards the receiving recess.
16. The portable electronic device as claimed in claim 14, wherein central lines of the first shaft hole, the third shaft hole and the sixth shaft hole are in parallel with each other in a same plane.
17. The portable electronic device as claimed in claim 14, wherein in an opening state, the arc spring drives the first linking board and the second linking board rotate relative to the fixing base by stretching deformation, and the end of the arc spring is received in the receiving recess.
18. A portable electronic device, comprising a first cover, a second cover and a connecting mechanism connecting the first cover with the second cover, the connecting mechanism comprising a four-bar linkage mechanism and an arc spring elastically connecting with the four-bar linkage mechanism, the arc spring driving the four-bar linkage mechanism rotating to open and close the second cover on the first cover.
19. The portable electronic device as claimed in claim 18, wherein the four-bar linkage mechanism comprises a fixing base fixed on the first cover, a turning base fixed on the second cover, a first linkage board rotatably connecting the fixing base with the turning base, and a second linking board rotatably connecting the fixing base with the turning base.
20. The portable electronic device as claimed in claim 19, wherein the fixing base comprises a first adjusting base protruding outwardly from edge of the fixing base, the second linking base comprises a second adjusting base extending from the second linking base, the arc spring elastically connects the first adjusting base with the second adjusting base to drive the first linking board, the turning base and the second linking board rotating relative to the fixing base.
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 method of reducing smoke and particulate emissions from an exhaust gas from a spark-ignited reciprocating engine operating on a liquid petroleum fuel, comprising the step of: adding a fuel additive to the liquid petroleum fuel, the fuel additive comprises:
an oil-soluble iron compound wherein the oil-soluble iron compound comprises ferric naphthenate or iron naphtenate salt; and
an over-based magnesium compound.
2. The method of claim 1 wherein the fuel additive contains from about 3 parts to about 8 parts iron per about 1 part magnesium, by weight.
3. The method of claim 1 wherein the fuel additive contains from about 4 parts to about 7 parts iron per about 1 part magnesium, by weight.
4. The method of claim 1 wherein the fuel additive contains about 5 parts iron per about 1 part magnesium, by weight.
5. The method of claim 1 wherein the liquid petroleum fuel contains about 50 PPM of iron, based on weight, after adding the fuel additive.
6. The method of claim 1 wherein the smoke and particulate matter in the exhaust gas is reduced by at least 90 percent by weight.
7. The method of claim 1 wherein the spark-ignited reciprocating engine is a gasoline engine which operate at about 400 to 1,000 rpm to about 1,000 to 6500 rpm.
8. A method of catalyzing combustion of a liquid petroleum fuel in a spark-ignited reciprocating engine, comprising the step of:
adding an oil-soluble iron compound and an over-based magnesium compound to the liquid petroleum fuel; wherein the oil-soluble iron compound comprises ferric naphthenate or iron naphtenate salt; and whereby the engine has improved engine performance, increased engine horsepower produced and increased fuel efficiency.
9. An additive for liquid petroleum fuel for use in a spark-ignited reciprocating engine that produced an exhaust gas, the additive comprising:
a combination of an oil-soluble iron compound and an over-based magnesium compound wherein the oil-soluble iron compound comprises ferric naphthenate or iron naphtenate salt;
the combination operable to reduce smoke from the spark-ignited reciprocating engine when an effective amount of the combination is introduced into the liquid petroleum fuel for use in the spark-ignited reciprocating engine; and
the combination further operable to reduce particle emissions from the exhaust gas of the spark-ignited reciprocating engine when an effective amount of the combination is introduced into the liquid petroleum fuel for use in the spark-ignited reciprocating engine.
10. The additive of claim 9 wherein the additive contains from about 3 parts to about 8 parts iron per about 1 part magnesium by weight.
11. The additive of claim 9 wherein the additive contains from about 4 parts to about 7 parts iron per about 1 part magnesium by weight.
12. The additive of claim 9 wherein the additive contains from about 5 parts iron per about 1 part magnesium by weight.
13. The additive of claim 9 wherein the additive is operable to reduce smoke and particulate matter in the exhaust gas by at least 90 percent by weight.
14. The additive of claim 9, wherein the over-based magnesium compound is selected from the group consisting of oxide, carboxylate, sulfonate and mixtures thereof.