US3570459A — Two-stroke cycle engine

Claim 1

Independent Claim 135 words

An engine, comprising: a rotatable crankshaft; a flywheel secured to said shaft coaxially thereof; a crankpin carried by said flywheel and having its axis radially offset from, and parallel to, the axis of said shaft; a rocker arm pivotally connected at one end to said pin, and having on its opposite end a curved bearing surface coaxial on an axis parallel to the axis of said pin; a reciprocable member having on one end thereof a curved bearing surface slidably engaged with the first-named bearing surface coaxially thereof; a piston attached to the opposite end of said reciprocable member for reciprocation transverse to the axis of said shaft; and means connecting said arm to said reciprocable member to hold said curved bearing surfaces in sliding contact with one another during the reciprocation of said piston.

Claim 2

Dependent Claim 135 words

An engine, comprising: a rotatable crankshaft; a flywheel secured to said shaft coaxially thereof; a crankpin carried by said flywheel and having its axis radially offset from, and parallel to, the axis of said shaft; a rocker arm pivotally connected at one end to said pin, and having on its opposite end a curved bearing surface coaxial on an axis parallel to the axis of said pin; a reciprocable member having on one end thereof a curved bearing surface slidably engaged with the first-named bearing surface coaxially thereof; a piston attached to the opposite end of said reciprocable member for reciprocation transverse to the axis of said shaft; and means connecting said arm to said reciprocable member to hold said curved bearing surfaces in sliding contact with one another during the reciprocation of said piston.

Claim 3

Dependent Claim 25 words

An engine as defined in claim 1, wherein: said bearing surface on said arm is convex; and said bearing surface on said member is concave.

Claim 4

Dependent Claim 42 words

An engine as defined in claim 1, wherein: said arm has an arcuate groove disposed coaxially of the axis of said pin; and an annular land is integral with said wheel coaxially of said pin and seats slidably in said arcuate groove.

Claim 5

Dependent Claim 37 words

An engine as defined in claim 3, wherein a connecting lever is pivoted at one end on said pin and projects at its opposite end into a registering recess formed in said one end of said arm.

Claim 6

Dependent Claim 74 words

An engine as defined in claim 1, wherein: said arm has therethrough an arcuate slot at least one side of which is located in spaced, coaxial relation to said curved surface on said arm; and said connecting means comprising a rod fixed at one end to said member, and engaged at its opposite end in said slot to have sliding contact with said one side of said slot during the reciprocation of said piston.

Claim 7

Dependent Claim 148 words

An engine, comprising: a rotatable crankshaft; a flywheel secured to said shaft coaxially thereof; an annular land integral with the face of said flywheel and having its axis radially oFfset from, and parallel to, the axis of said shaft; a reciprocable member having in one end thereof a concave, arcuate recess; a piston attached to the opposite end of said member for reciprocation in a direction transverse to the axis of said shaft; a rocker arm having at one end a convexedly curved surface seated in said concave recess in said member, and having intermediate its ends an arcuate groove slidably seated over a portion of said land coaxially thereof; and means connecting said arm to said member and operative to hold said curved surface and said groove on said arm in angular sliding contact with said concave recess and said land, respectively, during reciprocation of said piston.

Claim 8

Dependent Claim 148 words

An engine, comprising: a rotatable crankshaft; a flywheel secured to said shaft coaxially thereof; an annular land integral with the face of said flywheel and having its axis radially oFfset from, and parallel to, the axis of said shaft; a reciprocable member having in one end thereof a concave, arcuate recess; a piston attached to the opposite end of said member for reciprocation in a direction transverse to the axis of said shaft; a rocker arm having at one end a convexedly curved surface seated in said concave recess in said member, and having intermediate its ends an arcuate groove slidably seated over a portion of said land coaxially thereof; and means connecting said arm to said member and operative to hold said curved surface and said groove on said arm in angular sliding contact with said concave recess and said land, respectively, during reciprocation of said piston.

Claim 9

Dependent Claim 49 words

An engine as defined in claim 6, including: a crank pin secured to said wheel coaxially of said land; and a lever pivoted at one end to said pin and projecting at its opposite end into a recess in the end of said arm remote from said curved surface.

Claim 10

Dependent Claim 186 words

An engine, comprising: a hollow crankcase; a head closing one end of said crankcase and having therein a pair of spaced, parallel cylinder bores; a pair of crankshafts projecting into said crankcase, and mounted to rotate about a pair of spaced parallel axes transverse to the axes of said bores; a pair of flywheels secured to said shafts for rotation therewith in said housing; a pair of crankpins carried by said flywheels in equispaced, radially offset relation to the axes of rotation of said shafts; a yoke reciprocable in said crankcase and having on one end thereof a pair of curved bearing surfaces; a pair of pistons secured to the opposite end of said yoke for reciprocation in unison in said bores; a pair of rocker arms pivotally connected at one end to said pins, and having at their opposite ends curved bearing surfaces slidably engaged with said bearing surfaces on said yoke; and means connecting said arms to said yoke and operative to maintain said bearing surfaces on said arm in sliding contact with said bearing surfaces on said yoke during reciprocation on said pistons.

Claim 11

Dependent Claim 186 words

An engine, comprising: a hollow crankcase; a head closing one end of said crankcase and having therein a pair of spaced, parallel cylinder bores; a pair of crankshafts projecting into said crankcase, and mounted to rotate about a pair of spaced parallel axes transverse to the axes of said bores; a pair of flywheels secured to said shafts for rotation therewith in said housing; a pair of crankpins carried by said flywheels in equispaced, radially offset relation to the axes of rotation of said shafts; a yoke reciprocable in said crankcase and having on one end thereof a pair of curved bearing surfaces; a pair of pistons secured to the opposite end of said yoke for reciprocation in unison in said bores; a pair of rocker arms pivotally connected at one end to said pins, and having at their opposite ends curved bearing surfaces slidably engaged with said bearing surfaces on said yoke; and means connecting said arms to said yoke and operative to maintain said bearing surfaces on said arm in sliding contact with said bearing surfaces on said yoke during reciprocation on said pistons.

Claim 12

Dependent Claim 41 words

An engine as defined in claim 8, including means interconnecting said crankshafts, and operative to cause the rotation of one of said shafts to be imparted to the other so that said shafts rotate in opposite directions and at equal speeds.

Claim 13

Dependent Claim 43 words

An engine as defined in claim 8, wherein: the bearing surfaces on said yoke are concave; the bearing surfaces on said arms are convex; and each pair of contacting bearing surfaces is coaxial of an axis parallel to the axes of said crankshafts.

Claim 14

Dependent Claim 57 words

An engine as defined in claim 8, wherein: each of said flywheels has on one face thereof an integral, annular land that surrounds the associated crankpin coaxially thereof; and each of said arms has in one face thereof an arcuate groove which slidably overlies part of the land on the associated flywheel coaxially of the last-named land.

Claim 15

Dependent Claim 78 words

An engine as defined in claim 11, wherein: each of said arms has therethrough an arcuate slot between its curved bearing surface and its arcuate groove; and said connecting means comprises a pair of rods fixed at one end to said yoke, and having at their opposite ends laterally offset hook portions which project slidably into said slots in said arms to hold said bearing surfaces on said arms in contact with said bearing surfaces on said yoke.

Claim 16

Dependent Claim 40 words

An engine as defined in claim 11, wherein the ratio of the effective length of each of said rocker arms, to the radial distance between each of said pins and its associated crank axis, is less than 2 to 1.

Claim 17

Dependent Claim 114 words

An engine as defined in claim 8, including: a valve housing mounted in said head between said cylinder bores and having an inlet port connected to a fuel supply, and an outlet port operatively connected to said cylinder bores; a piston mounted in a bore in said housing, and connected to said yoke for reciprocation thereby axially in the Last-named bore; first valve means in said housing operative selectively to connect opposite ends of said last-named bore to said inlet port during reciprocation of the last-named piston; and second valve means in said housing operative selectively to connect opposite ends of said last-named bore to said outlet port, during reciprocation of said last-named piston.

Claim 18

Dependent Claim 106 words

An engine as defined in claim 14, wherein: said first valve means comprises at least one check valve mounted normally to close off said last-named bore from said inlet port, and operative, when the pressure of said fuel supply exceeds the pressure in said last-named bore, to open and connect said supply to said last-named bore; and said second valve means comprises at least one check valve mounted normally to close off said last-named bore from said outlet port, and operative to connect said last-named bore to said outlet port, when the pressure at said outlet port is less than the pressure in said last-named bore.

Claim 19

Dependent Claim 100 words

An engine as defined in claim 14, including: a second valve housing mounted in said head adjacent the first-named housing and having therein a chamber communicating with said outlet port in said first-named housing; a normally-closed valve mounted in said second housing for reciprocation between an open position in which it connects said chamber with said cylinder bores, and a closed position in which it closes off said chamber from said cylinder bores; and cam means operated by one of said crankshafts and connected to said valve momentarily to open said valve once during each revolution of said one crankshaft.

Claim 20

Dependent Claim 109 words

An engine as defined in claim 8, including: a second head closing the opposite end of said crankcase and having therein a pair of spaced cylinder bores registering with the bores in the first-named head; a second pair of pistons mounted to reciprocate coaxially in said bores in said second head; and means for connecting said second pair of pistons to said flywheels for reciprocation in unison with the first-named pair of pistons, so that when said second pair of pistons are in their fully retracted positions in their associated cylinder bores the first-named pair of pistons are in their fully extended pistons in their bores, and vice versa.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-03-15	1974-09-14	1975-03-16	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-03-15	1978-09-14	1979-03-16	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-03-15	1982-09-14	1983-03-16	$7700.00	Window Closed / Lapsed

Two-stroke cycle engine

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