US1247366A - Valve-lifter. - Google Patents

Description

f :2: MILF ES H. BBOCKWAY, 01E' DETROIT, MICHIGAN.

valeva-mman.

Specication of Letters Patent.

Patented Nov. 2d, 191W..

Application led March 9,' 1917. Serial No. 153,607.

To all wlwt 'z'tmay concern.'

-Be it lmownthat L CIARLEs ,I-I. BrockwAY, a citizen of the United States, reslding at Detroit, in the county of Wayne and State of Michigan, have invented a certaln new and useful Improvement lin Valve- Lifters, of which the following is a full, clear, and exact description, reference be- -ing had to the accompanying drawings.

This invention relates to an improved valve lifter or tappet for use with 1ntern al combustion engines, and it has for Vits main object the'economical production of an extremely light device of this character.

Valve tappets or lifters have heretofore been turned from a solid bar of stock, w1th a consequential Waste of material and the production of an unnecessarlly heavy article. -It is essential that the vcam engaging face of the lifter be hardened in order to resist the wear to which it is subjected, and in these turned types of lifters the entire article has to undergo the hardening process with the liability of warping the parts of the tappet out of proper relation to each other, and the loss of the entire artlcle, a should the process fail.

My invention provides for the making of the body portion of the tappet or lifter. of sheet metal, drawing or otherwise shaping it into a hollow barrel and head, and into the latter the insertion of a hardened steel disk which may be secured in place preferably by turning the periphery of the head over the edge of the disk. A pad or gasket of some Sultable comparatively soft material, such as lead may be inserted between the disk and head to cushion the action of the disk against the head, Aand in the event t@ that there is play between the parts, and to deaden the sound resulting from the action of the cam upon the tappet.

A further object comprehended by my invention is the provision of a very simple and t5 edectual means of adjustment to compensate for any shortening, as by wear, of the parts between the cam and valve.

The foregoing objects are attainedin the very simply constructed tappet illustrated t@ in the drawing accompanying and forming a parthereof wherein detail through the crank case of an engine showing my improvedtappet in elevation interposed between a cam and valve rod;

oFig. 2 is a central vertical section through the tappet; Fig. 3 shows, in perspective, the

1mproved tappet or To portray the environments of my in.

.21, to facilitate the Figure 1 is a sectional parts of the tappet in separated condition, the body portion of the tappet being in section; and Figs. 4 tability of prevailing adjustments, to my llfter.

vention I have shown a sectional detail through` a common engine construction wherein 1 represents a crank case having an aperture 2 in its top wall through which projects the lower end of a guide 3, in axial alinement with which is the valve stem 4 above and the cam 5 below.

As previously stated, the body portion of the tappet is formed of a single piece of sheet metal and comprises a barrel and head 11. The periphery of the head is turned over in a direction away from the barrel to produce a flange l2. The larger diameter of a beveled edge disk is adapted to be inserted within 11 and to be held therein by the inwardly pressed edge of the fiange 12. Prior to assembling, the disk 15 is hardened for the purpose already explained. A pad 1.6, which may be in the form of a disk or washer, and consisting of some comparatively sott material, such as lead, may be inserted between the disk and the inner surface of the head, although the use of this pad is not deemed absolutely necessary. It serves to dampen the noise produced by the actior` of the cam upon the disk 15, especially if the disk, or any portion of it, should be loose.

The up er end of the barrel l10 may be inset, as siiown at 17, to receive therewithin plates or shims through which an adjustment is accomplished by the inclusion'of the required any wear of the parts that would result in a shortening of the distance between the cam and valve. The upper end of the barrel `mayfbe notched on each side to substantially the depth of the shim cavity, as indicated at insertion or removal of and to enable the number of shims to be readily ascertained.

of the method of adjustment just I may employ a very common expedient in the form of an `adjustment screw shown in Fig. 4, as threaded within the reduced and internally threaded upper end of the barrei 10. Ur l may adopt a more recent practice and apply a cap 28 to the end of the barrel, said cap having prongs the shims, employed Instead described,

and 5 illustrate the 'adap' number of shims to compensate for the cavity of the head f 29 stuck ont of itslcircularl wall and bent u ward to "receive between them the s ims 30.

From the foregoing description it will'- be seen that my invention provides for a very chea and convenlent production of a v highly e cient tappet that is extremely light, and that requires the hardening of only the disks 15 in order to make its wearing qualities equal to those of its more expensive and prohibitively heavy predecessor.

Having thus described my invention, what I claim is:

1. As a new article of manufacture, a tappet comprising a barrel formed of sheet metal and having a valve operating end,

and a cam engaging element attached to its opposite end.

2. As a new article of manufacture, a tappet comprising a barrel formed of sheet metal, a cam engaging element attached thereto,- and a shock absorbing member interposed between the element and barrel.

3. As a new article of manufacture, a tappet comprising a sheet metal barrel having a flared end, and a cam engaging element of hardened material attached to said dared end.

its end flared outward into a plane perpendicular to the axis of the barrel, a cam engaging disk applied to said portion and held in place by the turned over edge of said portion.

6. As a new article of manufacture, .a tappet comprising a sheet metal barrel having its end ilared outward into a plane perpendicular to the axis of the barrel, a cam eni nannten gaging disk applied to said portion and heid in place by the interlocked edges of said portion and disk.

7. As a new article of manufacture,`a tappet comprising a sheet metal barrel having its lower end ared outward and then anged downward to produce a recessed head and a disk held within the recess of the head by the downwardly flanged portion.

8. As a new article of manufacture,'a tappet comprising a sheet metal barrel havingits lower end flared outward and then lianed :downward lto produce a recessed hea and a beveled edge disk having .its side of greater diameter retained within the recess of the head b the downwardly ianged portion thereo 9. As a new article of manufacture, a tappet comprisin a sheet metal barrel having its lower en .dared outward and then llaned downward to produce a recessed hea a disk held within the recess of the head by the downwardly flanged portion thereof, and a shock absorbing pad interposed between the disk and head.

10. As a new article of manufacture, a

tappet comprising a sheet metal barrel hav' ing an-- abutment inset from one end for the support of ad]ustment shims, and a cam engagm 'element attached to the opposite end of sai barrel.

11. As a new article o f manufacture, a tappet comprising a sheet metal barrel having a closed inset end for the reception of adjustment shims, and a cam engagin element attached to the opposite end cfg said barrel.

In testimony whereof, I hereunto aiiix my signature in the presence of two witnesses.

.CHARLES H. BROCKWAY.

Witnesses:

Lotus L. Boonou'r, H. W. Rlzon.

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