US1654378A - Engine - Google Patents
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- Publication number
- US1654378A US1654378A US707211A US70721124A US1654378A US 1654378 A US1654378 A US 1654378A US 707211 A US707211 A US 707211A US 70721124 A US70721124 A US 70721124A US 1654378 A US1654378 A US 1654378A
- Authority
- US
- United States
- Prior art keywords
- flange
- rollers
- engine
- shaft
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B9/00—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups
- F01B9/04—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with rotary main shaft other than crankshaft
- F01B9/06—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with rotary main shaft other than crankshaft the piston motion being transmitted by curved surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
- F02B75/18—Multi-cylinder engines
- F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
- F02B75/224—Multi-cylinder engines with cylinders in V, fan, or star arrangement with cylinders in fan arrangement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B9/00—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups
- F01B9/04—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with rotary main shaft other than crankshaft
- F01B9/06—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with rotary main shaft other than crankshaft the piston motion being transmitted by curved surfaces
- F01B2009/061—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with rotary main shaft other than crankshaft the piston motion being transmitted by curved surfaces by cams
- F01B2009/066—Tri-lobe cams
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/18—Mechanical movements
- Y10T74/18056—Rotary to or from reciprocating or oscillating
- Y10T74/18296—Cam and slide
Definitions
- rlhis invention relates to piston engines in general'but to internal combustion engines of this type in particular, and has to do wlth a means of dispensing with the crank shaft common to such engines.
- he principal object of my invention is to provide a novel mechanical arrangement for ⁇ transmitting. the power from the pistons to a straight engine shaft without the use of cranks or eccentric straps or the like, thus doing away with the usual babbitted bearings of these parts and their frequent adjusting and renewal.
- Figure 1 is a sectional elevation of one form of (my engine taken transversely through the main shaft;
- Figure 2 is a longitudinal4 central section of the engine as seen in elevation
- Figure 3 is a diagrammatic representan tion of a means of increasing the effectivenessof the power stroke of my engine
- Figure @t shows a modification in the cross head guides g, 4
- FIGS. 5 and 6 show modifications in the forni of my driving flange
- Figure 7 shows a modified arrangement of the driving flange rollers.
- my invention consists es ⁇ sentially of any number of cylinders with pistons therein each having a fixed piston rod working back and forth in cross head guides to stabilize'them, and each rod carrymg rollers at its inner end bearing against a special shaped driving flange secured to the shaft for transmitting power thereto.
- (l) is the engine casing, (2) the straight main shaft passing through the casing and supported on roller bearings at (3).
- a ywheel here shown as being secured to the shaft outside of the casing, though it may be positioned inside of the casing if the latter is made large enough.
- cylinders (5) directed toward the shaft though not necessarily on strictly ra dial ylines for they may be offset slightly as indicated in Figure 3 with advantages 1n some cases.
- rllhe cylinders may be distributed around the shaft or kept von thenpper side only as illustrated, and in this case they would preferably be disposed at about'45o to one another, and of course there may be any number' arranged along the shaft. though one set only 1s shown as being sul'hcientljv illustrative.
- each cylinder is a piston (6) having a piston rod (7)' rigidly mounted thereon and stabilized against side motion by a cross head (8) working in slots (9) in the cylinder walls.
- the cross head Y may work on a pair of bars (10) projecting from the inner end of thc cylinder as indicated in Figure et.
- the rods therefore move back and forth with the pistons in a straight line and-arc prevented from revolving by the cross head.
- llach piston rod carries rollers (1l) at its inner end engaging opposite sides of a driving flange (12) secured to the shaft.
- the flange is shown in Figure 1 as triangular shaped with rounded points and depressed sides, but it may assume other forms either oblong, square as shown in Figure 5, or whatever the arrangement of the cylinders, stroke, size of rollers, etc., may require in order to develop the greatest power or best results.
- rFhe flange is preferably of even thickness vand the rollers on the side toward the piston are conical and the pins (13) at an angle so that they maybe adjusted to secure a perfeet fit against the Hangs.. Shims between the ⁇ hub ofthe conical roller and the carrier block will'niake this a simple matter.
- My invention may be used with various types of engines but is here shown with an engine of thel T head construction having inlet and exhaust vvalves at (16) and (17) operated by cam rods (18) and (19) and which rods are operated at'the proper time by suitable cams (20) so that each cyl inder may be fired When its piston is just over every other high point onv the driving flange, theintermediate high points being of course at the end of the exhaust stroke.
- rollers (13) mounted 'on a pivoted carrier to compensate for the angularity of the flange it is possible to have the rollers rigidly spaced on the piston rod and operating against a flangeof variable thickness, as indicated at (12') vin Figure 6, to compensate for the angularity, or the rollers on one side of the flange may be yieldingly mounted in any manner to accomplish the same result.
- An engine of the character describedl comprising a casing with "a straight shaft therein, a pair of driving flanges spacedly secured to said shaft,- a cylinder carried by the casing having a piston reciprocable lftherein, a piston rod rigidly secured to the" piston and projecting between the flanges, carriers pivotally connected to the piston rod and a plurality of oppositely disposed rollers connected to the carriers and engaging opf posite sides of both flanges substantially as described.
- a rotatable flange a piston having a rod with rollers thereon opposite sides of the llange, and means for adjusting the rollers to lit closely against the flange, said means comprising a turnable adapted to bear againstangular mounting for turning the rollers rel ative to the flange whereby they may be ad justcd to andfrom the flange.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Reciprocating Pumps (AREA)
Description
Dec. 27, 1927. 1,654,378
P. -MARCHETTI ENGINE original Filed April 17, 1924 2 Sheets-Sheet 1 .PA- UL MAB DHETT.
HTTRNEYS.
Dec. 27, 1927. 1,654,378
P. MARCHETTI AEHGINE Original Filed April 1'7, 1924 2 Sheets-Sheet 2 figa.
INI/s NTDH PAUL MARCHETTI Patented Dec. 27, 1927.
STATES PAUL MARCHETTI, OF SAN-FRANCISCO, CALIFORNIA.
ENGINE.
Application filed April 17, 1924, Serial No. 707,21f1. Renewed November 15, 1927.
rlhis invention relates to piston engines in general'but to internal combustion engines of this type in particular, and has to do wlth a means of dispensing with the crank shaft common to such engines.
'l he principal object of my invention is to provide a novel mechanical arrangement for` transmitting. the power from the pistons to a straight engine shaft without the use of cranks or eccentric straps or the like, thus doing away with the usual babbitted bearings of these parts and their frequent adjusting and renewal. y
l attain the object outlined by the engine construction shown in the accompanying drawings, and in which Figure 1 is a sectional elevation of one form of (my engine taken transversely through the main shaft;
Figure 2 is a longitudinal4 central section of the engine as seen in elevation;
Figure 3 is a diagrammatic representan tion of a means of increasing the effectivenessof the power stroke of my engine;
Figure @t shows a modification in the cross head guides g, 4
Figures 5 and 6 show modifications in the forni of my driving flange; and
Figure 7 shows a modified arrangement of the driving flange rollers. i
By a. general review of the drawings it will be seen that my invention consists es` sentially of any number of cylinders with pistons therein each having a fixed piston rod working back and forth in cross head guides to stabilize'them, and each rod carrymg rollers at its inner end bearing against a special shaped driving flange secured to the shaft for transmitting power thereto.
' lin the drawings, (l) is the engine casing, (2) the straight main shaft passing through the casing and supported on roller bearings at (3). At (4L) is a ywheel, here shown as being secured to the shaft outside of the casing, though it may be positioned inside of the casing if the latter is made large enough.
Projecting from the casing are any number of cylinders (5) directed toward the shaft though not necessarily on strictly ra dial ylines for they may be offset slightly as indicated in Figure 3 with advantages 1n some cases. rllhe cylinders may be distributed around the shaft or kept von thenpper side only as illustrated, and in this case they would preferably be disposed at about'45o to one another, and of course there may be any number' arranged along the shaft. though one set only 1s shown as being sul'hcientljv illustrative.
Within each cylinder is a piston (6) having a piston rod (7)' rigidly mounted thereon and stabilized against side motion by a cross head (8) working in slots (9) in the cylinder walls.
` lf desired, however, the cross head Ymay work on a pair of bars (10) projecting from the inner end of thc cylinder as indicated in Figure et. The rods therefore move back and forth with the pistons in a straight line and-arc prevented from revolving by the cross head. j
llach piston rod carries rollers (1l) at its inner end engaging opposite sides of a driving flange (12) secured to the shaft.
The flange is shown in Figure 1 as triangular shaped with rounded points and depressed sides, but it may assume other forms either oblong, square as shown in Figure 5, or whatever the arrangement of the cylinders, stroke, size of rollers, etc., may require in order to develop the greatest power or best results.)
lin practice two flanges are used for each piston rod, one on each side as shown in Figure 2, and the rod carries two sets of rollers bearing against the outer and inner surface of the flanges rlhe rollers are arranged to compensate for the varying angularit-y of the flange presented between them during its revolutionn lhis may be done in several ways, the one 1nd1cated being to mount the rollers on pins (13) projecting from carrier blocks (la) which are pivotally supported on the pins (15) projecting from the lpiston rod. lif desired four rollers may be mounted on each carrier as shown in Figure 7..
rFhe flange is preferably of even thickness vand the rollers on the side toward the piston are conical and the pins (13) at an angle so that they maybe adjusted to secure a perfeet fit against the Hangs.. Shims between the `hub ofthe conical roller and the carrier block will'niake this a simple matter.
My invention may be used with various types of engines but is here shown with an engine of thel T head construction having inlet and exhaust vvalves at (16) and (17) operated by cam rods (18) and (19) and which rods are operated at'the proper time by suitable cams (20) so that each cyl inder may be fired When its piston is just over every other high point onv the driving flange, theintermediate high points being of course at the end of the exhaust stroke.
It will thus be lseen that the pistons being confined to straight line movement with rollers against the flange Will force the flange and shaft to rotate, and the inner surface of the flange Will pull out the piston for the suction stroke.
The effectiveness of the engine depends on the particular form and size of the driving @langes and their relation to the pistons. If the pistons are offset with respect to the shaft as indicated in Figure it is manifest the power stroke delivered against the flange will be more effective, but on the other hand vthis Aoffsetting cannot be very much or the piston Will not rise With lthe next high part of the flange.
Instead of having the rollers (13) mounted 'on a pivoted carrier to compensate for the angularity of the flange it is possible to have the rollers rigidly spaced on the piston rod and operating against a flangeof variable thickness, as indicated at (12') vin Figure 6, to compensate for the angularity, or the rollers on one side of the flange may be yieldingly mounted in any manner to accomplish the same result.
l. An engine of the character describedl comprising a casing with "a straight shaft therein, a pair of driving flanges spacedly secured to said shaft,- a cylinder carried by the casing having a piston reciprocable lftherein, a piston rod rigidly secured to the" piston and projecting between the flanges, carriers pivotally connected to the piston rod and a plurality of oppositely disposed rollers connected to the carriers and engaging opf posite sides of both flanges substantially as described. u
2. In an engine of the character described a rotatable flange, a piston having a rod with rollers thereon opposite sides of the llange, and means for adjusting the rollers to lit closely against the flange, said means comprising a turnable adapted to bear againstangular mounting for turning the rollers rel ative to the flange whereby they may be ad justcd to andfrom the flange.
PAUL MARCHETTI.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US707211A US1654378A (en) | 1924-04-17 | 1924-04-17 | Engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US707211A US1654378A (en) | 1924-04-17 | 1924-04-17 | Engine |
Publications (1)
Publication Number | Publication Date |
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US1654378A true US1654378A (en) | 1927-12-27 |
Family
ID=24840797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US707211A Expired - Lifetime US1654378A (en) | 1924-04-17 | 1924-04-17 | Engine |
Country Status (1)
Country | Link |
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US (1) | US1654378A (en) |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3020885A (en) * | 1961-09-01 | 1962-02-13 | Weinstock Manuel | Rotary servo valve controlled mechanism |
US3075504A (en) * | 1960-12-30 | 1963-01-29 | Schlepperwerk Nordhausen Veb | Hydraulic transmission system |
US3648528A (en) * | 1970-04-20 | 1972-03-14 | Promoco Interprises Ltd | Rotary cam controlled engine |
US3945358A (en) * | 1973-02-02 | 1976-03-23 | Brain Stanley Collins | Rotary internal combustion engine with cam transmission |
WO1997024518A1 (en) * | 1995-12-26 | 1997-07-10 | Tritec Power Systems Ltd. | Tri-lobed cam engine |
WO2001065072A1 (en) * | 2000-02-29 | 2001-09-07 | Fantuzzi Reggiane Corporation S.A. | Internal-combustion engine with improved reciprocating action |
WO2003021082A1 (en) * | 2001-08-28 | 2003-03-13 | Fantuzzi Reggiane Corporation Holding S.A. | An improved reciprocating internal combustion engine |
US7219631B1 (en) * | 2003-02-24 | 2007-05-22 | O'neill James Leo | High torque, low velocity, internal combustion engine |
WO2008030421A2 (en) * | 2006-09-07 | 2008-03-13 | Heimbecker John A | Stroke control assembly |
US20080060628A1 (en) * | 2006-09-07 | 2008-03-13 | Heimbecker John A | Self-lubricating piston |
US20080141855A1 (en) * | 2005-09-14 | 2008-06-19 | Fisher Patrick T | Efficiencies for cam-drive piston engines or machines |
US20090313984A1 (en) * | 2008-06-24 | 2009-12-24 | Rez Mustafa | Hydraulic hybrid turbo transmission |
US20090313990A1 (en) * | 2008-06-24 | 2009-12-24 | Rez Mustafa | Pneumatic hybrid turbo transmission |
US20100064675A1 (en) * | 2008-06-24 | 2010-03-18 | Rez Mustafa | Hydraulic hybrid turbo-transmission |
US20100071640A1 (en) * | 2008-09-25 | 2010-03-25 | Rez Mustafa | Internal combustion engine with dual-chamber cylinder |
US20100116578A1 (en) * | 2008-11-12 | 2010-05-13 | Rez Mustafa | Hybrid turbo transmission |
US20100192878A1 (en) * | 2008-09-25 | 2010-08-05 | Rez Mustafa | Air hybrid engine with dual chamber cylinder |
CN101529065B (en) * | 2006-09-07 | 2013-08-07 | Revetec控股有限公司 | Improved opposed piston combustion engine |
US8622032B2 (en) | 2008-09-25 | 2014-01-07 | Mustafa Rez | Internal combustion engine with dual-chamber cylinder |
US9080498B2 (en) | 2012-04-11 | 2015-07-14 | Mustafa Rez | Combustion engine with a pair of one-way clutches used as a rotary shaft |
US9382839B2 (en) | 2014-03-25 | 2016-07-05 | Jeffrey Bonner | Combustion engine comprising a central cam-drive system |
US20170058879A1 (en) * | 2015-09-01 | 2017-03-02 | PSC Engineering, LLC | Positive displacement pump |
CN109026380A (en) * | 2014-01-15 | 2018-12-18 | 纽勒诺有限公司 | Piston arrangement, internal combustion engine and its assemble method |
EP3521559A1 (en) * | 2013-08-30 | 2019-08-07 | Newlenoir Limited | Piston arrangement and internal combustion engine |
WO2020183126A1 (en) * | 2019-03-11 | 2020-09-17 | Newlenoir Limited | Piston arrangement |
US11725576B2 (en) * | 2016-05-16 | 2023-08-15 | Frank J. Ardezzone | Internal combustion engine with adaptable piston stroke |
-
1924
- 1924-04-17 US US707211A patent/US1654378A/en not_active Expired - Lifetime
Cited By (42)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3075504A (en) * | 1960-12-30 | 1963-01-29 | Schlepperwerk Nordhausen Veb | Hydraulic transmission system |
US3020885A (en) * | 1961-09-01 | 1962-02-13 | Weinstock Manuel | Rotary servo valve controlled mechanism |
US3648528A (en) * | 1970-04-20 | 1972-03-14 | Promoco Interprises Ltd | Rotary cam controlled engine |
US3945358A (en) * | 1973-02-02 | 1976-03-23 | Brain Stanley Collins | Rotary internal combustion engine with cam transmission |
WO1997024518A1 (en) * | 1995-12-26 | 1997-07-10 | Tritec Power Systems Ltd. | Tri-lobed cam engine |
WO2001065072A1 (en) * | 2000-02-29 | 2001-09-07 | Fantuzzi Reggiane Corporation S.A. | Internal-combustion engine with improved reciprocating action |
WO2003021082A1 (en) * | 2001-08-28 | 2003-03-13 | Fantuzzi Reggiane Corporation Holding S.A. | An improved reciprocating internal combustion engine |
US20040261732A1 (en) * | 2001-08-28 | 2004-12-30 | Luciano Fantuzzi | Reciprocating internal combustion engine |
JP2005501993A (en) * | 2001-08-28 | 2005-01-20 | ファンツッジ レッギアネ コーポレーション ホールディング エス.エー. | Improved reciprocating internal combustion engine |
US6976467B2 (en) | 2001-08-28 | 2005-12-20 | Fantuzzi Reggiane Corporation Holding S.A. | Reciprocating internal combustion engine |
US7219631B1 (en) * | 2003-02-24 | 2007-05-22 | O'neill James Leo | High torque, low velocity, internal combustion engine |
US20080141855A1 (en) * | 2005-09-14 | 2008-06-19 | Fisher Patrick T | Efficiencies for cam-drive piston engines or machines |
US7552707B2 (en) * | 2005-09-14 | 2009-06-30 | Fisher Patrick T | Efficiencies for cam-drive piston engines or machines |
CN101529065B (en) * | 2006-09-07 | 2013-08-07 | Revetec控股有限公司 | Improved opposed piston combustion engine |
US20080092846A1 (en) * | 2006-09-07 | 2008-04-24 | Heimbecker John A | Stroke control assembly |
WO2008030421A3 (en) * | 2006-09-07 | 2008-04-24 | John A Heimbecker | Stroke control assembly |
US20080060602A1 (en) * | 2006-09-07 | 2008-03-13 | Heimbecker John A | Self-lubricating piston |
US7475666B2 (en) | 2006-09-07 | 2009-01-13 | Heimbecker John A | Stroke control assembly |
US20080060628A1 (en) * | 2006-09-07 | 2008-03-13 | Heimbecker John A | Self-lubricating piston |
WO2008030421A2 (en) * | 2006-09-07 | 2008-03-13 | Heimbecker John A | Stroke control assembly |
US8336304B2 (en) | 2008-06-24 | 2012-12-25 | Rez Mustafa | Hydraulic hybrid turbo-transmission |
US8235150B2 (en) | 2008-06-24 | 2012-08-07 | Rez Mustafa | Pneumatic hybrid turbo transmission |
US20100064675A1 (en) * | 2008-06-24 | 2010-03-18 | Rez Mustafa | Hydraulic hybrid turbo-transmission |
US20090313984A1 (en) * | 2008-06-24 | 2009-12-24 | Rez Mustafa | Hydraulic hybrid turbo transmission |
US20090313990A1 (en) * | 2008-06-24 | 2009-12-24 | Rez Mustafa | Pneumatic hybrid turbo transmission |
US8622032B2 (en) | 2008-09-25 | 2014-01-07 | Mustafa Rez | Internal combustion engine with dual-chamber cylinder |
US20100192878A1 (en) * | 2008-09-25 | 2010-08-05 | Rez Mustafa | Air hybrid engine with dual chamber cylinder |
US8490584B2 (en) | 2008-09-25 | 2013-07-23 | Rez Mustafa | Air hybrid engine with dual chamber cylinder |
US20100071640A1 (en) * | 2008-09-25 | 2010-03-25 | Rez Mustafa | Internal combustion engine with dual-chamber cylinder |
US8191517B2 (en) | 2008-09-25 | 2012-06-05 | Rez Mustafa | Internal combustion engine with dual-chamber cylinder |
US8087487B2 (en) | 2008-11-12 | 2012-01-03 | Rez Mustafa | Hybrid turbo transmission |
US20100116578A1 (en) * | 2008-11-12 | 2010-05-13 | Rez Mustafa | Hybrid turbo transmission |
US9080498B2 (en) | 2012-04-11 | 2015-07-14 | Mustafa Rez | Combustion engine with a pair of one-way clutches used as a rotary shaft |
EP3521559A1 (en) * | 2013-08-30 | 2019-08-07 | Newlenoir Limited | Piston arrangement and internal combustion engine |
AU2018200603B2 (en) * | 2014-01-15 | 2019-10-03 | Newlenoir Limited | Piston arrangement |
CN109026380A (en) * | 2014-01-15 | 2018-12-18 | 纽勒诺有限公司 | Piston arrangement, internal combustion engine and its assemble method |
US9382839B2 (en) | 2014-03-25 | 2016-07-05 | Jeffrey Bonner | Combustion engine comprising a central cam-drive system |
US20170058879A1 (en) * | 2015-09-01 | 2017-03-02 | PSC Engineering, LLC | Positive displacement pump |
US10408201B2 (en) * | 2015-09-01 | 2019-09-10 | PSC Engineering, LLC | Positive displacement pump |
US11725576B2 (en) * | 2016-05-16 | 2023-08-15 | Frank J. Ardezzone | Internal combustion engine with adaptable piston stroke |
WO2020183126A1 (en) * | 2019-03-11 | 2020-09-17 | Newlenoir Limited | Piston arrangement |
US11603881B2 (en) | 2019-03-11 | 2023-03-14 | Newlenoir Limited | Piston arrangement |
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