US1421783A - Automatic take-up device - Google Patents

Description

F. JERDONE AUTOMATIC TAKE-UP DEVICE.

APPLICATION FILED FEB.24, 1919- F. JERDONE, JR.

AUTOMATIC TAKE-UP DEVICE. APPLICATION FILED FEB. 24, 1919.

L L778, Patented. July 4;, 1922 2 SHEETS-SHEET 2- I N V EN TOR. i/ra o/ye J:

A TTORNEY uurran earaur (DFFIQEO FRANCIS JERDONE, JR., OF TOLEDO, OHIO, ASSIGNOR TO THE WILLYS-OVERLAND COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO.

AUTOMATIC TAKE-UP DEVICE.

Specification of Letters Patent.

Patented July 4:, IOZ2,

Application filed. February 24, 1919. Serial No. 278,769.

T 0 all w homit may concern Be it known that I, FRANCIS JERDONE, Jr., a citizen of the United States, residingiat Toledo, in the county of Lucas and State of Ohio, have invented certain new and useful Improvements in Automatic Take-Up Devices, of which I declare the following to be a full, clear, and exact description.

My invention relates to an automatic take-up device, and has for its object to provide improved means adapted to compensate for lost motion between two or more co-operating members or mechanisms.

Another object of the invention is to provide a simple and inexpensive automatic take-up device, which is particularly adapted to compensate for lost motion between the valves and cam shaft of an internal combustion engine,'such as is used on motor vehicles.

Another object of the invention is to provide two or more reciprocallymounted members, one of which is of tubular construction, in which is mounted means for automatically effecting movement of one of said members with respect to the other to compensate for lost motion between the several parts of the mechanism.

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 inveution is susceptible to certain modifications not shown in the drawing, which will be comprehended by the appended claims.

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

Figure I is a. fragmentary-sectional elevation showing the application of my invention as applied between the valves and cam-shaft of an internal combustion engine.

Figure II is an enlarged detail side elevation of the push rod shown in Figure I.

Figure III is a top plan view of same.

Figure IV is a sectional plan taken on lines IV--IV of Figure II.

Figure V is a detailed-perspective view of the cam operating member shown in section in Figure I.

Figure VI is a fragmentary-sectional elevation illustrating a slightly modified form of the invention.

Figure VII is a top-plan View of the push rod shown in Figure VI.

Figure VIII is a fragmentary, sectional elevation of another modification of the invention.

Figure IX is a fragmentary, sectional elevation taken on line IX-IX of Figure VIII.

, Figure X is a longitudinal section through the upper end of one of the push rods with the cam and cam operating parts removed.

Figure XI is an enlarged detail plan of the cam operating member shown in Figure VIII, and Figure XII is a side elevation of the same.

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

The automatic takeup 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 may readily 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 or frame 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 1% for supporting the spring sea (s15 carrying the lower ends of the valve closing springs 16, the upper e-ndsof said springs being held by the valve stem guides 17, which are preferably castintegral with the cylinder block. Seated upon the earns 18 of the cam shaft 11 are the heads 19 of the push rods 20, which are reciprocably mounted in the ides 21 of the engine frame or block 10. The push rod 20 is provided with a longitudinally extending bore or recess 22, into which is screwed the threaded 'end 23 of the head 19, as. shown in Figure I. The upper end of the push rod 20 is provided with a transversely disposed wall which is recessed to receive the cam 25, upon which is mounted the valve stem seat 0 ten-ding into engagement with the lower of the valve stem 13. The cam 25 is preferably elliptical or spheroidal in form, and is mounted within said recessed wall with its axis extending normally at a right angle to the longitudinal axis of the valve stem, it being understood that the wall 24 and seat 26 are curved to correspond with the curvature of the cam when the latter is in the posit-ion shown in Figure I. In this figure it will be seen that the cam projects slightly beyond thewall 24 at one side thereof, and at this point it is engaged by the operating member 27, shown in perspective in Figure V. The operating member 27 is provided at its upper end and on its inner face with a recess 28, which is curved to correspond to the curvature of the cam 25 at the end thereof. The upri ht portion of the cam operating member 2? normally lies in the opening 29 formed through the upper end wall of the push rod 20, and the horizontal portion 30 of said operating member is extended into the recess 22 of the push rod and is seated upon the upper end of a spring 31, the lower end of which rests upon the extension 23 of the head 19 of the push rod. The cam operating member 27 is held upon the spring 3,1 and in engagement with the cam 25 by means of the guide 21 in which the push rod and .operating member are slidably mounted. It will be seen from this construction that the spring 31 serves to automatically move the operating member for the purpose of rotating the cam 25 to compensate for lost motion between the valve and cam shaft of the eng In the modification shown in Figures VI and VII the parts are substantially the same as those already described with the exception that the push rod 32 is made in one piece with the transverse wall 24 omitted and the bore 33 extended entirely through the upper end of the rod, the cam operating member 34 lying wholly within the bore and engaging the cam at a point nearer its center than in the arrangement shown in Figure I. In this modification the annular face of'the upper end of the push rod 82 is provided with acurved recess 34 as shown in Figure VII said recess being curved to correspond to the curvature of the cam 25.

In the modification shown in Figures VIII to XII inclusive, the push rod 35 is similar to the push rod 32 shown in Figure VI, with the exception that it is provided at its upper end with ,a longitudinally extending slot or opening 36, in which the upright portion of the cam operating member 37 is mounted, the horizontal portion of said member being seated upon the spring 31 in the bore 38 of the push rod, said operating member being held against lateral displacement by means of the guide or bearing 21 in which the push rod reciprocated. The upright portion of the operating member 37 where it engages the cam is curved as indicated at 40 to correspond to the curvature of the cam 41. The cam 41 is preferably elliptical in form and is provided at its opposite sides with the trunnions 42, which are rotatably mounted in curved recesses formed upon the spaced bearing portions 43 of the valve stem 13 which portions are formed by slotting or recessing the valve stem as indicated at 44 in Figures VIII and IX. In this case the push rod 35 is recessed at points beneath the trunnions 42 as indicated at 45 sufiiciently to prevent the contacting of the trunnions with said push rod, this construction being clearly shown in Figure IX. In this modification the cam operating member 37 is actuated by the spring 31 in the bore 38 of the push rod and said operating member is guided by the push rod bearing 21, and is constantly acting upon the cam at one end thereof, tending to pivotally move the same about the cam seating point- 46 on the push rod to either raise the trunnions 42 or depress the push rod to compensate for lost motion between the valves and the cam shaft.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In an automatic take-up device, the combination with the valve stem and push rod of an internal combustion engine, a cam shaft for actuating said parts, a cam between said valve stem and push rod, a spring carried by the push rod within a recess formed therein, and a cam operating member disposed between said spring and cam for actuating the latter to compensate for lost motion between the valve and cam shaft.

2. In an automatic take-up device, the

combination with the valve stem and push rod of an internal combustion engine, a cam shaft for operating said parts in one direction, a. spring for actuating said parts in an opposite direction, a. removable seat for the free end of said valve stem, a cam disposed between said removable seat and the adjacent end of said push rod, a spring mounted within a recess formed in'said push rod, and an operating member disposed between said spring and cam'for actuating the latter to automatically compensate for lost motion between the valve and cam shaft.

3. In an automatic take-up device, the combination with the valves and push rods of an internal combustion engine, means for actuating the same, guides for said push rods and the stems of said valves, a cam mounted between each of the valve stems and push rods, a. spring mounted a recess formed in each of said push rods and an operating member for each of the cams interposed between the cam and spring and held against displacement by said push red guide.

4. In an automatic take-up device, the

combination with the valve and valve stem of an internal combustion engine, a push rod provided with a recess, a cam seated upon within said recess for actuating the cam operatingrmember, and means for actuating said push rod and valve stem.

5. In an automatic take-up device, the combination with the valves and valve stems of an internal combustion engine, push rods provided with longitudinal bores and having openings through their wallscommunieating with said bores, a cam seated upon the end of each of the push rods nearest the valve stems and co-operating with the latter to actuate the same, a spring mounted in each of said bores, a cam operating member having angular portions, one of which extends lnto engagement with said springs and the other being disposed in the opening in the wall of the push rod and co-operating with the cam to actuate the same, andmeans for actuating said. push rods and valve stems.

6. In an automatic take-up device, the combination with the exhaust valves and valve stems of an internal combustion engine, a cam provided with trunnions rotatably engaging said valve stem, a push rod for each of said valve stems, means carried by said push rod for rotating said cam upon its trunnions and pivotally moving it upon said seat and means for simultaneously actuating the push rod and valve stem independently of the operation of said cam.

7. In an automatic take-up device, the combination with the exhaust valve and valve stem of an internal combustion engine, a rotatable cam co-operating with the valve ing said members, a cam interposed between the adjacent ends of said members and means mounted in said tubular member for actuating said cam to compensate for lost motion between said parts.

9. In an automatic take-up device, the combination with two or more r'eciprocably mounted members, one of which is of tubular construction, means for actuating said members, a cam rotatably mounted between said members, a spring mounted in said tubular member, and an operating member for rotating said cam adapted to be actuated by said spring.

10. In an automatic take-up device, the combination with two or more members mounted for reciprocating movement, one of which is of tubular construction, guides for said members, means for reciprocating said members within the guides, a cam rotatably mounted between said members for moving one relatively to the other, a spring in said tubular member and an operating member for the cam seated upon said spring and extending through an opening in the wall of the tubular member in sliding engagement with the guide for said tubular member.

11. An automatic take-up device comprising a tubular member, a spring within said member, a follower arranged to be actuated by the spring and a floating cam having one end loosely engaging the wall of the tubular member and t-heother disposed on the follower whereby upon expansion of the spring the cam will pivot about the end engaging said wall, said device being insertable between two movably mounted parts, one of which is adapted to seat upon the cam.

12. An automatic take-up device ,comprising a tubular member, a spring anchored within said tubular member, a follower arranged to be actuated by said spring, said tubular member and follower being provided with oppositely arranged concave portions and a cam having its opposite ends resting within said concave portions, the cam being adapted to pivot upon the tubular member when the follower is actuated by the spring, said device being insertable between two movable parts, one of which is adapted to seat upon the cam.

13. An automatic take-up device comprising two relatively movable members, one of which is spring actuated upon the other and a cam having its opposite ends loosely resting upon said members, said device being insertable between two movably mounted parts, one of which is adapted to be seated upon the cam.

14. An automatic take-up device comprising a tubular member having a slot in the open end thereof, a spring supported within said tubular member, a follower seated upon said spring having a portion disposed within said slot and extending substantially to the end of the tubular member and a cam having one end loosely resting upon the outer end of the follower and the other loosely engaging the tubular member whereby when the follower is moved outwardly the cam will pivot about the end resting upon said tubular member, said device being insertable between two movable parts, one

of which is adapted to seat upon the cam. In testimony whereo 'I afiix my signature.

FRANCIS J ERDONE, J a.

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