US1424205A - Valve silencer - Google Patents

Description

1. P.. McCALL-US.

VALVE SILENQER. APPLICATION FILED MMI. 31,192I.

Patented Aug., L 1922.

FIGI. 1

FIG. 2.

j naeaaoa invitan arrives rarear JOHN P. ICGALLUS, 0F lTElll'IERLY, PENNSYLVANIA.

Application led March 31, 1921.

T 0 @ZZ whom it may concern:

Be it known that I', JOHN P. MGCALLUS, a citizen of the United States of America, residing at lNeatherly, in the county of Carbon and State of Pennsylvania, have invented certain new and useful Improvements in Valve Silencers, of which the following is a specification.

This invention relates to certain new and useful improvements in valve silencers and more particularly relates to an improved attachment for the tappet rods or valve operating mechanism whereby the objectionable chattering and like noises are prevented which occur incident to wear between the contacting parts of the valve stem and tappet rod, and between the tappet rod and its mounting sleeve.

Briefly described, the invention comprises a piece of metal formed for rigid attach-` ment to the adjusting bolt of the tappet rod and including depending legs arranged to frictionally engage the engine casing or fra-me at opposite sides of the tappet rod. The depending` fingers are resilient so as to prevent rattling of the tappet rod within its mounting sleeve and, by engaging the engine casing at opposite sides of the tappet rod turning of the latter is prevented so as to insure proper engagement between the lower end of the tappet rod and its actuating cam. The friction between the depend* ing legs of the attachment and the engine casing prevents downward movement of the tappet rod beyond the downward movement to which it is pressed by the valve stem so that, at no time, is there any play between the tappet rod and the valve stem for producing the objectionable knocking between these parts.

With the above general objects in view and others that will become apparent as the nature of the invention is better understood, the same consists in the novel form, combination and arrangement of parts hereinafter more fully described and shown in the ac companying drawing, in which like reference characters indicate corresponding parts throughout the Several views.

In the drawing,

Figure 1 is a fragmentary elevational view of an engine with its valve operating mecha` nism equipped with a valve silencer con-I structed in accordance with the present ini vention,

Figure 2 is a horizontal sectional view Specification of Letters Patent.

= VALVE sinnivcnn.

Serial No. 457,563.

the valve w ich is indicated by the numeral 8, and which has a stem 9 working in a suitable bushing 1U fitted through the lower end of the valve casing. A spring 11 bears at its upper end against the lower end of the valve casing and at its lower end against a ksuitable stop 12 upon said stem, and this spring tends to lower the valve to its seat. 'The oil containing crank case of the engine is indicated at 13, and working in the same is a cam shaft 14E carrying the actuating cam 15 for the valve, said cam being designed to coact with the push rod, which latter in turn, coacts with the lower end of the valve stem as will now be explained.

The push rod usually includes a cylindrical member 16 having a roller 17 journaled on the lower end thereof for engagement with the cam 15 and said cylindrical member 16 is mounted for vertical sliding movement through the top of the crank case 13 and in a removable sleeve 18 carried thereby. The cylindrical member 16 is also provided with a threaded bore 19 in its upper end adjustably receiving an abutment screw 2O which is held at adjustment by means of a jamb nut 21 threaded thereon and usually bearing against the upper end of the section 16. As clearly shown in the drawing, the

lower end of the valve stem 9 rests upon the head of the abutment screw 20 in both the open and closed positions of the valve until wear takes place between this screw and the valve stem when play is permitted between ythe same and consequently causes an objec- Patented ring. 1, 1622..

rattling noise and to also prevent turning of the member 1610i the tappet rod'.

This is accomplised by means of -a simple form of attachment clearly shown Figurev 4f which consists of a single piece of metal with `a plate portion 22 having a central opening 23'V for reception of the shank of the abutment screw 20 whereby said plateportion is rigidly clamped against turning between the jamb nut 21'andf the upper end of the tappet vrod' member 16. rlhe attachment also includes ai pair of resilient legs 24 which extend at right angles from the plate portion 22 and :tromy opposite ends of the latter so as to frictio'nally engage the vertical tace 25 of the engine casing. Thus,

the legs 24 depend so as to flatly engage said face 25 at opposite sides of the sleeve 18 and the tappet rod carried thereby so that turning of the tappet rod is prevented while the frictiona'l engagement of the legs with the engine casingprevents the tappet` rodfrom' lowering further than the' same is positively f moved by means of the stem 9 of the valve 8 when the latter is seated` by means of the spring 11. In this way, Contact is'insured between the abutmentscrew 20 and the valve stem 9 so as to prevent hammering betweenA these' partsan'd theresilient nature of the legs 2li prevents such movement of the' tap pet member 16 as would cause rattling of the same against the sleeve I8. It will be noted i that the present attachment does not serve ing from the spirit and scope of the invention as claimed.

' What is claimed as new is:

A valve silencingfattachment for tappet rods comprising apiece of sheet metal' including a plate portion with a central opening for reception ofthe abutment screw of the tappet rod whereby the' devic'emay ybe rigidly clamped' against .the upper end of the tappet rod by the j amb nut of said abut ment screw, and depending resilient legs carried by said plate portion and disposed' to trictionally engage the adj-acentvert'ical tace ol the enginey casing, said legs being of lesser length than said vertical face whereby the entirel attachment may bodily move vertically with the tappet rod withl only trictional resistance to suchV movement.

In testimony whereof I af'x my signature.

JOHN P. MGCALLUS.

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