US1421784A - Automatic take-up device - Google Patents

Description

F.'JERDON E, JR.

AUT OMATIC TAKE-UP DEVICE.

APPLICATION FILED FEB. 24 1919. 4 1 ,421 5,784, Patented July 4, 1922 2 SHEETS-SHEET I.

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A TTORNEY r JERDONE JR.

AUTOM ATIG TAKE-UP DEVICE] APPLICATION FILED FEB. 24, I919 l %31 784 T Patented July 41, 1922.,

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FRANCIS JERIDONE, JR., 015 TOLEDO, OHIO, ASSIGNOIR, TO THE WILLYS-OVERLAND COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO.

AUTOMATIC TAKE-UP :onvron.

Specification of Letters Patent.

Patented July 4, 1922.

Application filed February 24, 1919. Serial No. 278,770.

' To all whom it may concern:

Be it known that I, FRANoIs JERDONE, J12, a citizen of the United States residing at Toledo in the county of Lucas and State of Ohio, have invented certain new and useful Improvements, in Automatic Tal e-Up Devices. of which I declare the following to be a full, clear, and exact description.

My invention relates to an automatic takeup device 'and has for its object to provide improved means adapted to automatically compensate for lost motion between two or more co-ope rating parts or mechanisms.

A further object of the invention is to provide, between the cam shaft and exhaust valve of an internal combustion engine, an improved automatic take-up device adapted to compensate for lost motion between said parts, suitable means being also provided for conveying lubricating material from the crank case of the engine to said take-up device.

-Another object of the invention is to provide between the push rod and valve stems of an internal combustion engine a spring actuated spacing member having inclined faces engaging correspondingly inclined.

faces on the push rod and stem and tending to constantly mox e said parts in opposite directions. I 1

To these and other ends the invention comprises certain novel features of construction and arrangement of parts as will be hereinafter more fully described and claimed,.it being understood that the invention is susceptible to certain modifications not shown in the drawings which will be comprehended by the appended claims.

A structure constituting one embodiment of my invention is shown in the accompanying drawings forming a part of the specification in which:

Figure I is a fragmentary sectional elevation illustrating the application of one form of the invention to the valves of an internal combustion engine.

Figure II is an inverted plan of the valve stem seat shown in Figure I.

Figure III is a top plan view of the cam shown in FigureI.

Figure IV is a vfragmentary sectionalelevation of a modified form of the invention.

Figure V is a detail side elevation of the cam shown in Figure IV.

Figure VI isa fragmentary sectional elevation illustrating another embodiment of the invention. a

Figure VII is a sectional elevation taken on the line VIIVII of Figure VI.

Figure VIII is a detail perspective view of one of the cams shown in Figure VI.

Similar reference numerals refer to similar parts throughout the several views of the drawings. a

The automatic take-up device shown and described in the present application as a compensating means for lost motion between the valves and cam shaft of an internal combustion engine mayreadily be applied to other mechanisms where it is desired to provide compensating means for lost motion between an operating and operated member or members, it being understood that the present application is merely illustrative of one of the uses to which the invention may be put.

Referring to the drawings 10 represents a portion of the cylinder block of an internal combustion engine and 11 the cam shaft of the engine. The valves 12 are provided with the usual valve stems 13 through the lower ends of which are extended the pins 14: for supporting the spring seats 15 carrying the lower ends of the valve closing springs 16, the upper ends of said springs being held by the valve stem guides 17 which are preferably cast integral with the cylinder block. Seated upon the cams 18 ofthe cam shaft 11 are the heads 19 of the push rods 20,'which are reciprocably mounted in the guides 21 of the engine frame or block 10. The upper ends of the push rods 20 are provided with curved or concave faceswhich are rectangular in outline and which are adapted to receive the correspondingly shaped cams 22 shown in detail in Figure III. The cams are .the lower ends of the valve stems as shown 1n section in Figure I, it being understood that the lower faces of the seats are also concave or curved to correspond to the curva-' ture of the cam which is the same on both sides of its major axis, said cam being normally disposed with itsminor axis in a plane parallel to the longitudinal axis of the push rod. Projecting laterally fromthe .valve stem seat and adjacent the topthereof is a recessed arm 24 and beneath the same and.

the spring 26 rotates the cam 22 about an axis transverse to the longitudinal axis of the push rodor valvestem, or in a plane parallel to said valve stem axis, it being understood of course that rotation of the cam will be effected only whentheparts of themechanism have become worn or when the valve stems may be raised by the accumula-.

tion of carbon on the valves-and valve seats. It is understood, of course, that as the parts become worn from time to time and as the upper arm 24 is fixed relatively to the valve stem the spring 26 will shift the major axis of the cam from the normal horizontal position to a-n inclined position or in other words rotate the cam to take-up or compensate for any lost motion between the valve and cam shaft. This construction afi'ordsat all times a solid seat orbody of metal between the push rod and valve stem and has a wedging action constantly tending to move the valve stem away from the push rod.

In order to provide lubrication for the wearing surfaces of the cam and seatsthereof I have extended .through the push rod from a point beneath the cam to a pointed; one side of the head' 19 ofthe push rod a wick 27 upon which oil from the crank case of the engine may be splashed to be conveyed by capillary attraction to said cam, said wick-being tightly drawn into the diagonally extended bore of the push rod as shown at the left of Figure, I. i

In the modification shown in Figures IV and V I have provided a slightly modified form of cam as indicated at 28, which is seated in a recess in the top of the pushrod, said recess being curved to correspond to the curvature of the cam on its lower face arm in the form of a pin 30 which is screwed into the cam and provided with a notch 31 in the outer end thereof to receive the lower end of the coil spring 32, the upper end of said spring being anchored in the notch 33 of the pin 34 which is screwed into the lower end of the push rod' 13. The pin 30 when in to compensate for lost motion between the several parts of the mechanism.

In Figures VI and VII I have shown a" double cam arrangement wherein the two cams 35 are, placed side by side with their laterally iip-turned arms 36 extending in opposite 'directions'a'nd upon opposite sides of the valve stem 13 as shown in Figure VI. In this modification the adjacent ends of the push rod and valve stem are recessed to receive said cams in the manner shown in Figures VI and VI'If The arms 36 are preferablybevelled or inwardly inclined as indicated at 37 to receive the lower end of the coil spring 38, the upper end ofwhich is preferably seatedupon the pin 14 supportmg the spring seat 15. However, the upper end of said spring 38 may be anchored at a point below said'pin if desired, to permit the pinto be more conveniently removed from the valve stem. 'By providing the inclined or bevelled faces on the arms 36 of the cams 35 to form a seat for the lower end of the spring '38, said spring is thereby properly centered around the valve stem and held against lateral displacement in the operation ofthe cams. It will be understood that as the parts of'the'mechanism become worn from time to, time. the spring 38 will automatically'rotate the cams'35 in opposite directions-to compensate for lost motion between the valves and cam shaft, thereby preventing noise in the operation of the device and assurmg accuracy in the lifting of the valves at the proper predeterminedtime.

Having thus described my invention, what 1 I claim as new and desire'to secure by Letters Patent, is: 1 7' 1. In an automatic take-up deviceuthe combination with two or more members to be actuated, and aspring actuated member interposed between the first mentioned members and rotatable. about an axis extending transversely to and intersecting the longitudinal axis of the members to be actuated and tending to move the same in opposite direce tions.

2. In 'an automatic take-up device, the combination with two or more members to be'actuated, an elliptical member rotatable between said first mentioned members about a fixed axis transverse to the direction of movement of the actuated members and tending to" move the same in opposite directions, means for actuating said rotatable member, and means for actuating the first mentioned members independently of the last mentioned actuating means.

13. In an automatic take-up device, the, combination with two or more members to be re IV and the actuated, a plurality of elliptical ,ngrpbers interposed between said first mentioned members for moving the same in opposite directions, and means for actuating saidlast mentioned members.

4. In an automatic take-up device, the combination with two spaced members mounted for reciprocating movement, an elliptical cam interposed between the same and movable in a plane substantially parallel to the direction of movement of the re-. ciprocably mounted members, means for actuating-said cam, and means for actuating said reciprocably mounted members.

5. In an automatic take-up device, the combination with a plurality of spaced members mounted for reciprocating movement, means for reciprocating the same, independent elliptical cams mounted between said members for rotation in opposite directions to efi'ect movement of said first mentioned members one relatively. to another, and 'means for actuating said cams.

6. In an automatic take-up device, the combination with a' plurality of spaced members mounted for reciprocating movement, means for reciprocating the same, independent elliptical cams mounted between said members for rotation in opposite directions ntrnefiect movement of said first mentioned members one relatively to another, means for actuating said cams, and means by which lubricatingmaterial is supplied to said cams. 7. In an automatic take-up device, the combination with two or more members mounted for reciprocating movement, means for reciprocating the same, means interposed between said. reciprocably mounted members adapted to move one relatively to another independently. of the reciprocating means, and a wick leading from an oil supply source through one of said first mentioned members to the interposed means for'moving said first mentioned'members.

8. In an automatic take-up device, the combination with two reciprocably mounted members, an elliptical cam mounted between said members for moving them in opposite directions, said cam having an arm extending therefrom, a yieldable member inter- ..posed between said arm and one of said members and means for reciprocating said first mentioned members.

9. In an automatic take-up device, the combination with two re'ciprocably mounted members, a pair of independent cams mounted between said members for 'movement in opposite directions to move one of said members relatively to another, oppositely extending arms upon said cams, means engaging the arms to move them in opposite directions, and means for reciprocating said first mentioned members.

' 10. In an automatic take-up device, the combination with two reciprocably mounted members, a pair of cams mounted between said'members for movement inopposite directions, a; spring surrounding one of the first mentioned members and cooperating with the cams to move them in opposite directions for the purpose of moving one of the first mentioned members relative to the other, and means for reciprocating said first mentioned members.

11; In an automatic take-up device, the

combination with two reciprocably'mounted members, a pair of cams mounted between said members and having oppositely extending arms provided with bevelled faces, a spring-anchored upon one of said first mentioned members and extending into engagement with the bevelled faces of said arms, and means for reciprocating said first mentioned members.

12. In an automatic take-up device, the combination with two spaced'reciprocably mounted members, means for actuating the same, a rotatable cam between said members provided with a laterally extending arm. a Spring anchor uponone of said.reciprocably mounted members. and a spring between said anchor and said arm tending to rotate said cam in a direction to move said reciprocably mounted members away from each other.

13. In an automatic take-up device, the combination with .two spaced members mounted for reciprocating movement, one of which is provided with a lateral projection, a rotatable cam interposed between said reciprocably mounted members, and having a projection thereon a spring interposed between said projections and operatively connected with said cam for rotating the same to compensate for lost motion between said parts.

14. In an automatic take-up device, the. combination with the valve stems and push 'rods of an internal combustion engine each of which is provided with a concave portion. a 'cam mounted between said valve stem and push rod having convex portions in engagement with said concave portions, means for actuating said cam to compensate for lost motion between said parts, and operating means for said valve stem and push rods.

15. In an automatic take-up device, the combination with the valve stems and push rods of'an internal combustion engine, a cam interposed between each of said stems and .pushrods to compensate for lost motion between the same, springs for actuating said cams,a cam shaft for actuating said push rods, and a wick extending from the cam of each of said pushrods into the crank case of the engine in positionto receive lubricating material from the crank case when the engine is running.

16. In an automatic take-up device, the

combination of two rods mounted end to i end, a member disposed between said ends having oppositely arranged convex faces engaging the ends of said rods and means combination of two rods' mounted end to end, a member disposed between said ends,

having oppositelyarranged convex faces with which sa id ends engage, an arm extending from sald'member and a spring connected with the arm' and tending to constantly rotate said member between said ends. X a x 1 In testimony whereof I afiix m si ature.

FRANCIS JERD N ,JR.

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