US976274A - Cap for renewing the worn ends of engine valve-stems. - Google Patents

Description

J. A.* M0HARDY GAP POR- RBNEWING "rHB WORN ENDS o? ENG-INE VALVE sTAEMs.

APXVLIOATION FILED UGZO, 1908.

Pmmled Nov. 22, 1910.

ATTORNEY Unrrnn sfrarns rafrnnfr ernten.

JAMES A. MGHARDY, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR OF ONE-HALF TO EDWARD M. JOHNSON, OF PROVIDENCE, RHODE ISLAND. i

CAP FOR RENEWING THE WORN ENDS OF ENGINE VALVE-STEMS.

Specification of Letters Yatvent.

Patented; Nov. 22, 193.02.'

Application filed August 20, 1909. Serial No. 513,796.

To all whom 'it maal concern:

Be it known thatI l, JAMES A. Mol-Ianni,

a citizen of the United States, resid-ing at the. city ot Providence. in the county ot Providence and State ot' Rhode Island,.have

invented certain new and useful Improvements in Caps tor Renewing the lVorn Ends of Engine Valve-Stems, of which the tollowing is a specification, reference being had 1o therein to the accompanying drawing.

Thisinvcntion relates to caps for renewing the worn ends or tips of engine valve stems and the like, the object being to provide an extremely simple, effective and inexpensive device adapted to be readily'attached to any l valve stem, or similar device after having been worn, to restore the same to its original length and consequently to its original usefulness.

nother object of this invention is to so construct these caps or tips that they may be employed on either the valve stem or the valve lift member, or both, if desired, when the same are new, so that either or both may be readily replaced, thereby quickly renewing the ends of each when worn and restoring the same to exactly their original length. Means are also provided in thse caps whereby they may be'irmly secured to the ends of the members over which they tit.

In the majority of explosive engines the ends of the valve stems come in direct contact -vvith the members which lift' them, and although both are hardenedthe `continual action soon wears these ends, thus causing the valveto be operated out. of time and so reduce the etliciency of the engine. The ordinary method of repairing a valve stem o worn is to heat, draw out, or lengthen the! 40 stem to compensate for .the portion worn A away. In doing this the stem is often sprung or thrown out of line and spoiled and the valve or the lift, or both, have to be re-` placed with fresh ones.

My improved device completely obviates the above ditticult-y. The bottom portion of the little -caps may be made of any desired thickness and hardened and when. a repair is to be effected al cap of 4the proper thickness is selected and quickly applied to the end of the valve stem or to the litter, or both, fully and permanently restoring these parts to their original usefulness.

Another feature ot the 'invention is that should the bottom of the cap be too thin to replace the entire portion worn away I have provlded a plurality of thin disks or washers adapted to be readily dropped into'the inside o't the cup before it is positioned, to build up this bottom or contacting portion so as to obtain exactly the required distance between the end of the stem and the working 'tace of the cap.

a With these and other objects 1n view, the invention consists of certain Ynovel features e5 o'f construction, as will be more fully described and particularly pointed out in the appended claims. i

In the accompanying drawings: Figure lshows a valve and its application to its seat which/is shown in section, also showing the valve lift and a contact or wear receiving cap or thimble on both the valve stem and the valve lifting member. .2 is a l detail in perspective of the cap or cup as made from solid stock. Fig. 3- is a sec- 'tional View of the same. Fig. 4fshows one ot' the caps as slotted to render its walls springv oryieldable so that it may be pressed in position onthe end of the stem and be retained thereon by friction. Fig. 5- is a sectional viw of the construction 'illustratedl in Fig. il. Fig. 6- illustrates one ot' the little caps as having been drawn up and constructed from esheet metal. Fig. 7- is an 85 enlarged view showing one of the disks or washers which are inserted into the cap for building up or thickening'the lower endV of ,thehame i Referring to the drawings, l designates the valve casing, a portion of which is shown in section. The valve 9., which is of the. usual beveled seated' type, ndsfits seat at 3 in said casing and its stem 4f, which is formed integral with thevalve', project-s 95 downward to meet the valve lift 5, lwhich latter is raised bythe cam 6 to engage and open and close the valve at: the proper time for the operation of the engine. l

lThe contacting ends 'of both" the yalve 1,00 i

stem and the stem of the .lifting member are shown as beingsupplied with caps 7 and 8- respectivly. These caps may be constructed plain and 'from solid stock, as illustrated in Figs. 2 and 3, or they may be 1`05 drawn up into a cup shape troni sheetstock of any suitable thickness, if desired. see Fig.

G. and hardened so they will tit .tightly onto the ends oit' the valve stems. The cap may ,be slotted as at 9, see Figs. il, 5 and t3, if de- 110 sired, and its upper 'edge'bent inward as at l0, see Fio'. (5, so as to grip stem and be retained in' position thereon by a yielding pressure. If desired, a set screw l1 may be employed for retaining the cap in position, or Vbot-h the set screw and the spring lips may be done away with and the caps be formed Ito lit tightly and be forced into operative position and caused to hold themselves by friction only.

A feature of this invention is that in order to avoid the grinding or filling of the contacting surfaces of these caps to reduce them to the required thickness for setting the valve, I have provided a very simple, inex pensive and effective method of accomplishing this purpose by supplyinga plurality of extremely thin washers l2 which` may be copped into the cup, as illustrated in Fig. l, for the purpose of building up or increasing the distance between the end of the stern and the working face of the cap.

My improved cap or thimble supplies a `long felt-,avant for a simple, inexpensive and effective method of renewing the worn portion of a valve stem and restoring the same to its original length, timing and consequent effectiveness.

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

l. As a new -article of manufacture, a hardened metallic cap having a substantially plain bore the sides of which are substantially parallell and adapted to be readily applied to an engine valve stern or valve lifter whereby the worn contacting surlnccsl between the stem and the lifter inay be readily renewed, said cap having means whereby the same is retained in position solely by friction.

2. As a new article of manufacture, a hardened metallic cap having a substantially plain bore and adapted to be readily applied to an engine valve stem or valve lifter whereby the worn contacting surface between the stem and the lifter may be renewed, means in said cap for retaining the saine in position, and means for regulating wenn applied to an engine l'alve stem or valve lifter whereby the worn contacting surface between the stem and the lifter may be renewed, and spring retaining 'walls 1n said cap whereby the saine is retained in its .operative position by friction.

4. As a new article of manufacture. a hardened metallic cap having a subs-lantially plain bore and adapted tobe readily applied to an engine Valve stem or valve lifter whereby the worn contacting surface between the stein and the lifter may be renewed, said cap being retained in position by friction, and one or more spacing' washers in said cap whereby the distance vbetween the thrust receivii-ig end of the stein and the working face of said cap may be regulated.

5. As a new article of manufacture, a hardened metallic cap having a substantially plain bore and adapted to be readily applied to an engine valve stem or valve lifter whereby the worn contacting surfacedwtween the stem and the lifter may be renewed. spring retaining walls in said cap whereby the same is retained in its operative position by friction, and one or more spacing washers in said cap whereby the distance bet'wccnthe thrust receiving end of the stem and the working face of said cap may be regulated.

f5. The combination with a valve stem and cooperating valve lifter of an engine, of hard metal caps removably fitted to the opposing ends of said stem and lifter, said caps being renewable to` preserve the proper i cooperation of the stem and lifter.

ln testimony whereof I affix my signature 1n presence of two witnesses.

Janus A. iut-HARDY.

llfitnesses:

Howmn ll. BAuLow, E. l. OumcN.

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