All The Claims

1. A method for constructing machinery flumes comprising:
fabricating a plurality of flume sections, each of said plurality of sections having at least one flume lining forming a channel and a rebar frame external of said channel;
precasting a concrete sheath over said lining and said rebar frame of each section, a portion of said at least one lining portion extending beyond an end of said form, and
coupling a first section of said plurality of sections by positioning said extending portion of said first section lining to overlay an end of a second of said plurality of flume sections, and by joining said extended portion overlay in said channel of said second flume section.
2. The invention as described in claim 1 wherein said lining includes a primary wall and a secondary wall.
3. The invention as described in claim 1 wherein said positioning includes lowering said first and second sections in an excavation.
4. The invention as described in claim 3 wherein said lowering comprises hoisting a spreader beam.
5. The invention as described in claim 4 wherein said spreader beam is an I-beam.
6. The invention as described in claim 1 and wherein said precasting including embedding anchors on said concrete layer.
7. A flume comprising:
a plurality of flume sections, each section having a lining supported in a reinforcement frame embedded in a precast concrete layer, and having an end of said lining extending beyond an edge of said precast concrete layer, an edge of said precast concrete layer having a key-way, an opposite edge of said precast concrete layer having a keying rim,
an end to end alignment of precast concrete sections and
a seal embedded between said edge of said precast concrete layer and said opposite edge of said precast concrete layer adjacent to said edge.
8. A flume as described in claim 7 and further comprising an excavation receiving each said flume section, said excavation having a width not substantially more than the width of said sections.
9. A method for constructing machinery flumes comprising:
constructing a plurality of flume sections;
each of said plurality of sections having at least one flume lining forming a channel;
securing said lining to a frame having a predetermined footing dimension below the channel;
precasting a concrete sheath about said lining and imbedding said frame, in a form, a portion of said at least one lining portion extending beyond one end of said sheath,
coupling a first precast section by positioning said extending portion to overlap an end of a second precast section.
10. The invention as described in claim 9 wherein said predetermined footing dimension of said first precast section and said predetermined footing dimension of said second precast section comply with a predetermined slope for the flume lining.
11. The invention as described in claim 9 and comprising installing said first and second precast sections in an excavation.
12. The invention described in claim 11 and comprising supporting said first and second precast sections by backfilling said excavation.
13. A method for constructing machinery flumes by installing precast sheathed, flume liner sections in an excavation, comprising:
installing at least one rigid support across the channel of the liner of each said precast sheathed section;
suspending said precast sheathed section by lifting said at least one rigid support; and
lowering said precast sheathed section into an excavation to position said liner at a predetermined height with respect to a benchmark; and
further comprising lowering a second precast sheathed section having an extended liner portion adjacent said first precast sheathed section so that said extended liner portion overlaps said first precast sheathed section liner.
14. The invention as described in claim 13 wherein said precast sheathed section includes an embedded frame, and wherein said frame includes a footing at a predetermined dimension from said liner.
15. The invention as described in claim 13 and comprising joining said extended portion to said overlapped portion in said channel.

The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.

We claim:

1. A circuit for three-phase electric conversion, comprising:
a main switching circuit comprising a plurality of main switches connected between a power rail and a ground rail;
an auxiliary switching circuit comprising a plurality of auxiliary switches connected between said plurality of main switches and one of said power rail and said ground rail, said plurality of auxiliary switches being half in number of said plurality of main switches.
2. A circuit for three-phase electric conversion as recited in claim 1 wherein each of said auxiliary switches is connected to a pair of said main switches through a resonant tank circuit.
3. A circuit for three-phase electric conversion as recited in claim 1,
wherein said plurality of main switches comprises six main switches, and
wherein said plurality of auxiliary switches comprises three auxiliary switches.
4. A circuit for three-phase electric conversion as recited in claim 1, wherein said plurality of main switches comprises six main switches arranged in three pairs, and
wherein said plurality of auxiliary switches comprises three auxiliary switches.
5. A circuit for three-phase electric conversion as recited in claim 4 further comprising:
a resonant tank comprising a series connected inductor and capacitor connected between each of said auxiliary switches and to each said pair of main switches.
6. An electric conversion circuit, comprising:
a three phase alternating current terminal;
a direct current terminal connected between a positive rail and a negative rail;
a main switching circuit comprising:
three pairs of main switches connected between said positive rail and said negative rail, a center point between each main switch pair comprising said three phase alternating current terminal; and
parallel diodes connected across each of said main switches;
an auxiliary switching circuit comprising:
three pairs of auxiliary diodes connected between said positive rail and said negative rail; and
three auxiliary switches each connected at a first end to one of said positive rail and said negative rail and at a second end to a center point of a respective one of said three pairs of auxiliary diodes; and
an resonant tank circuit connecting said main switching circuit and said auxiliary switching circuit.
7. An electric conversion circuit as recited in claim 6 wherein said resonant tank circuit comprises three pairs of an inductor and a capacitor connected in series.
8. An electric conversion circuit as recited in claim 6 wherein said conversion circuit is an inverter when a DC source is connected to said direct current terminal and a load is connected to said a three phase alternating current terminal.
9. An electric conversion circuit as recited in claim 6 wherein said conversion circuit is a rectifier when a DC load is connected to said direct current terminal and an AC source is connected to said a three phase alternating current terminal.

1. A method of making manufactured articles having resistance to vapour at high temperatures, of fluoroelastomeric or perfluoroelastomeric compositions curable by peroxidic way, comprising combining for 100 phr of fluoroelastomer or perfluoroelastomer:
as filler, from 2 to 70 phr of carbon black having surface area CTAB (ASTM D 3765) between 25 and 35 m2g;
as crosslinking agent, from 0.5 to 10 phr of a bis-olefin having general formula;
wherein:
R1, R2, R3, R4, R5, R6, equal to or different from each other, are H or C1-C5 alkyls;
Z is selected between a C1-C18 linear or branched alkylene or cycloalkylene radical, optionally containing oxygen atoms, or a fluoropolyoxyalkylene or perfluoropolyoxyalkylene radical.
2. The method according to claim 1, wherein in the (per)fluoroelastomeric fluoroelastomeric or perfluoroelastomeric composition the carbon black ranges from 5 to 50 phr.
3. The method according to claim 1, wherein in the fluoroelastomeric or perfluoroelastomeric composition the bis-olefin ranges from 0.6 to 5 phr.
4. The method according to claim 1, wherein in formula (I) Z is a C4-C12, perfluoroalkylene radical and R1, R2, R3, R4, R5, R6 are hydrogen; when Z is a fluoropolyoxyalkylene or perfluoropolyoxyalkylene radical, it comprises units selected from the following \u2014CF2CF2O\u2014, \u2014CFX1O\u2014, \u2014CF2\u2014CH2CH2O\u2014, and \u2014C3F6O\u2014, wherein X1=F, CF3.
5. The method according to claim 4, wherein Z has formula:
-(Q)p\u2014CF2O\u2014(CF2CF2O)m(CF2O)n\u2014CF2-(Q)p-\u2003\u2003(II)
wherein: Q is a C1-C10 alkylene or oxyalkylene radical; p is 0 or 1; m and n are numbers such that the mn ratio is between 0.2 and 5 and the molecular weight of said fluoropolyoxyalkylene or perfluoropolyoxyalkylene radical is in the range 300-10,000.
6. The method according to claim 5, wherein Q is selected from:
\u2014CH2OCH2\u2014; \u2014CH2O(CH2CH2O)sCH2\u2014, s being =1-3.
7. The method according to claim 4, wherein the bis-olefin has formula:
CH2\u2550CH\u2014(CF2)t0-CH\u2550CH2
wherein t0 is an integer from 6 to 10.
8. The method according to claim 1, wherein the fluoroelastomers or perfluoroelastomers contain peroxidic crosslinking sites.
9. The method according to claim 8, wherein peroxidic crosslinking sites are iodine andor bromine atoms.
10. The method according to claim 8, wherein the iodine andor bromine amount is between 0.001% and 5% by weight, with respect to the total weight of the polymer.
11. The method according to claim 8, wherein in the fluoroelastomers or perfluoroelastomers the iodine andor bromine atoms are in the chain andor in end position.
12. The method according to claim 8, wherein the fluoroelastomers or perfluoroelastomers are TFE copolymers with at least one per-fluorinated olefin having one unsaturation of ethylene type.
13. The method according to claim 12, wherein in the fluoroelastomers or perfluoroelastomers the comonomer is selected from:
fluoroalkylvinylethers or perfluoroalkylvinylethers (PAVE) CF2\u2550CFOR2f, wherein R2f is a C1-C6 fluoroalkyl or perfluoroalkyl;
fluoro-oxyalkylvinylethers or perfluoro-oxyalkylvinylethers CF2\u2550CFOX0, wherein X0 is a C1-C12 perfluorooxyalkyl, containing one or more ether groups;
fluorovinylethers or perfluorovinylethers (MOVE) having general formula:
CFX2\u2550CX2OCF2OR\u2033f\u2003\u2003(I-B)
wherein
R\u2033f has the following meanings:
C1-C6 linear or branched fluoroalkyl or perfluoroalkyl,
C5-C6 cyclic (per)fluoroalkyl or perfluoroalkyl,
C2-C6 linear or branched fluorooxyalkyl or perfluorooxyalkyl containing from one to three oxygen atoms,
X2=F, H.
14. The method according to claim 12, wherein the fluoroelastomers or perfluoroelastomers have the following compositions, expressed as % by moles:
TFE 50-85%, PAVE 15-50%;
TFE 20-85%, MOVE 15-80%, optionally PAVE 0-50%;
the sum of the monomers being 100% by moles.
15. The method according to claim 12, wherein the fluoroelastomers or perfluoroelastomers contain units deriving from VDF, C3-C8 fluoroolefins, optionally containing hydrogen atoms, chlorine andor bromine andor iodine, C2-C8 non fluorinated olefins (OI).
16. The method according to claim 15, wherein the fluoroelastomers or perfluoroelastomers have the following compositions:
33-75% by moles of tetrafluoroethylene (TFE), 15-45% by moles of a perfluorovinylether (PAVE), 2-25% by moles of vinylidene fluoride (VDF);
TFE 32-60%, PAVE 20-40%; OI 10-40%;
the sum of the moles of the compositions being 100%.
17. The method according to claim 1, wherein the fluoroelastomeric or perfluoroelastomeric composition comprises other components selected from:
a metal compound, in an amount between 0% and 15% by weight with respect to the polymer, selected from divalent metal oxides or hydroxides optionally associated to a weak acid salt;
reinforcing fillers, pigments, antioxidants, stabilizers.
18. The method according to claim 17, wherein the reinforcing fillers are selected from barium sulphate, silicates, semicrystalline fluoropolymers or perfluoropolymers.
19. The method according to claim 1, wherein the fluoroelastomers or perfluoroelastomers are in admixture with a semicrystalline fluoropolymer or perfluoropolymer in an amount, as per cent by weight referred to the total dry weight (per)fluoroelastomer+semicrystalline fluoropolymer or perfluoropolymer , from 0% to 70%.
20. The method according to claim 19, wherein the semicrystalline fluoropolymer or perfluoropolymer is constituted by tetrafluoroethylene (TFE) homopolymers, or TFE copolymers with one or more monomers containing at least one unsaturation of ethylene type, in an amount from 0.01% to 10% by moles, said comonomers with one ethylene unsaturation being both of hydrogenated and fluorinated type.
21. The method according to claim 19, wherein the hydrogenated comonomers are selected from ethylene, propylene, acrylic monomers, styrene monomers.
22. The method according to claim 19, wherein the fluorinated comonomers are selected from the following:
C3-C8 perfluoroolefins;
C2-C8 hydrogenated fluoroolefins; perfluoroalkylethylene CH2\u2550CH\u2014Rf, wherein Rf is a C1-C6 perfluoroalkyl;
C2-C8 chloro- andor bromo- andor iodo-fluoroolefins;
fluoroalkylvinylethers or perfluoroalkylvinylethers (PAVE) CF2\u2550CFORf, wherein Rf is a C1-C6 (per)fluoroalkyl;
fluoro-oxyalkylvinylethers or perfluoro-oxyalkylvinylethers CF2\u2550CFOX, wherein X is a C1-C12 alkyl, or a C1-C12 oxyakyl, or a C1-C12 (per)fluoro-oxyalkyl or (per)fluoro-oxyalkyl having one or more ether groups;
(per)fluorodioxoles, preferably perfluorodioxoles.
23. Fluoroelastomeric or perfluoroelastomeric compositions according to claim 1.
24. Manufactured articles obtainable from the curable (per)fluoroelastomeric compositions according to claim 1.
25. Cured fluoroelastomeric or perfluoroelastomeric compositions obtainable from the curable fluoroelastomeric or perfluoroelastomeric compositions according to claim 1.

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. An on-board lubrication assembly improvement in combination with a piston paint pump having a non-hydraulic powered paint pumping piston reciprocating in a bushing, the assembly improvement comprising:
a lubricant reservoir located internal to a housing of the pump having an inlet and an outlet;
an actuator extending exterior of the housing for manual activation by a user; and
a lubricant dispensing mechanism having a lubricant delivery piston received within a cylinder, the lubricant delivery piston movable in response to manual actuation of the actuator, the lubricant dispensing mechanism including an inlet connected to the outlet of the reservoir and having an outlet connected to deliver a predetermined repeatable amount of lubricant to the paint pumping piston adjacent the bushing when the user manually actuates the actuator.
2. The assembly of claim 1 wherein the lubrication assembly further comprises:
an inlet check valve located between the reservoir and the lubricant dispensing mechanism; and
an outlet check valve located downstream of the cylinder.
3. The assembly of claim 2 wherein the lubricant dispensing mechanism includes a return spring urging the lubricant delivery piston in a first direction in the cylinder, and the lubricant delivery piston is manually movable in a second direction in the cylinder.
4. The assembly of claim 3 wherein the lubricant delivery piston has a portion extending through an aperture in the housing and forming the actuator.
5. The assembly of claim 1 including a breather valve having an umbrella-like flange connected to a stem, the breather valve in fluid communication with the reservoir to prevent creation of a vacuum in the reservoir.
6. The assembly of claim 1 wherein the outlet of the lubricant dispensing mechanism includes an outlet adjacent to and directed at the paint pumping piston proximate the bushing.
7. The assembly of claim 1 further comprising a removable cover providing a liquid seal at the inlet of the lubricant reservoir wherein the cover has a pair of dogs releasable from a pair of cam surfaces in the inlet of the lubricant reservoir.