US1358429A - Puppet-valve - Google Patents

Description

H. W. EVANS.

PUPPET VALVE.

APPLICATION FILED MAY I9, 1919.

1,358,429 Patent-ed Nov. 9, 1920.

mvawtoz UNITED STATES PATENT OFFICE.

HAROLD W. EVANS, OF WASHINGTON, DISTRICT OF COLUMBIA.

rower-VA VE.

Specification of LettersPatent. Patented N A), 1920,

. Application filed May 19, 1919. Serial No. 298,301.

(FILED UNDER THE ACT OF MARCH 3, 1883, 22 STAT. In, 625.)

To all whom it may concern:

Be it known that 1, HAROLD 1V. Evans, a citizen of the United States, stationed at livashington, D. C., have invented an 1m provement in Puppet-Valves, of which the following is a specification.

The invention described herein may be used by the Government, or any of its officers or employees in prosecution of work for the Government, or by any other person in the United. States, without payment of any royalty thereon.

This invention relates 'to puppet-valves for internal combustion engines, and one of its objects is to design a valve having a s spindle or stem operable directly from the cam-shaft so as to dispense with push rods and other intermediate parts incidental to assemblies of this type.

Another object of this invention is to provide a puppet-valve having. means for modifying the length of its stem to enable rapid and convenient adjustment.

Another object is to provide a valve assemblyhaving means fornormally locking its adjustable parts to prevent disarrangement subsequent to adjustment. 1

With these and other objects in view my invention conslsts in certain novel detalls of constructlon, combination and arrange- 1 ment of parts to be more particularly set forth and claimed. Referring more particu-.

larly to the accompanying drawing in which corresponding parts areindicated by similar reference characters:

Figure l'is a transverse vertical sectio partly in elevation, taken along the axis the valve; Fig. 2 is a horizontal section on the line 2-2 of Fig. 1; I

Fig. 3 is a similar view on the line 3 -3 of Fig. 1.

Briefly stated, this invention comprises a valve having a hollow stem, a valvestem guide, inner and outer compression springs, a tappet provided with an externally threaded spindle telescopically engaging a valve stem, a spring retainer andadjusting collar having an outwardly inclined flange adapted to seat in a similarly shaped retaining flange formed on the tappet and means affording an interlocking engagement between the spring retainer and adjusting eollar and valve spindle.

In the illustrated embodiment characterizing this invention there is shown a frag ment of a standard internal combustion motor sharing a valve seat Z), seating a valve 1, the spindle 2 of which projects through a guide 3. The guide 3 is separate from the head casting and removable there from; midway its lengtli it is provided with a shoulder 3. j

The spindle 2 is hollowed throughout the greater portion of its length as at 4:, the hollow portion being provided with tapped threads 5 to engage threads 6 formed on spindle 7 of the tappet 8, when the former is telescopically positioned in valve spindle 2. Tappet 8 is formed with a flange 9,

the inner surface of which is downwardly Spindle bears at its lower end against the shoulder 3 on the valve stem guide and at its upper end bears against the collar 12.

The outer compression spring '14, as explained, bears against a part of the valve seat and forces the collar into engagementwith the tappet, while the innercompression spring 13, bearing at its upper end against the collar, serves lit/part the same p rpose, but in addition thereto, by its pressure on the shoulder on the removable valve stem guide it serves a secondary purpose of maintaining the valve stem guide in position. Tool openings 15 and 16 in tappet and adjusting collar permit their actuation when a clearance adjustment is being made. 001- lar 12 is fixedly secured to valve stem 2 adj acent its lower end by means of tongues 17 fitted into slots 18 formed in said spindle. The cam 19 on the cam-shaft 20 engages tappet 8 and operates the valve 1 in the usual manner.

In order to adjust this form of valve as sembly to obtain the proper clearance, cor. pression springs 13 and 14 are compressed whereupon collar 12 is disengaged from its seat in the tappet. After releasement of position by a tool or otherwise and tappet 8 rotated to withdraw'or cause the spindle 7 of the tappet to pass farther into the spindle 2 of the valve dependent upon the eXigency of the situation. The adjustment being made, compression springs 13 and 14 are released to return collar 12 to its initial posi' j tion in the tappet so that tappet 8 and collarg 12 function as a unitary structure.

Interlocking the tappet and adjusting .collar in this manner manifestly prevents any disarrangement of the parts after the clearance adjustment has been made.

By the preceding constructionthe efficiency of the motor is materially increased since push rods and other intermediate parts tending to increase the inertia of the valves are entirely dispensed With. Moreover, employing a valve of this kind tendsto reduce not only the cost of ments as Well. 1

Although .in the foregoing certain elements have been enumerated as best adapted to perform the functions allotted tow th'em, nevertheless it is understood that various minor changes may be resorted to within the scope of theappended claims without departing from or sacrificing any of the principles of this invention.

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

1. A puppet valve comprising a stem formed. of telescopically engaged sections having co-actingmeans 'for-efiecti ng their longitudinal adjustment, a valve on one sectlon, a tappet on the other section, said tappet provided with a seat formed-With a flaring production but of replace-- inner surface, an adjusting collar within said seat conformingto the shape thereof, a separate removable valve stem guide provided with a shoulder, a spring interposed between the shoulder on the valve stem guide and the collar, and means for normally maintaining said tappet and valve'in locked relation. j

2. A puppet-valve assembly comprising .inner and outer telescopicallyengaged sections havingco-acting means for effecting their longitudlnal ad ustment, a valve on' the outer section, a tappet on the other, the

latter being formed with a seat, said seatbeing provided with a flange, said flange.

having a taperedexterior surface to produce a wedge like act-ion between collar and tappet and a compression spring securing the collar Within its seat.

v HAROLD W. EVANS. Witnesses:

THOMAS H. MILLAR, Jr., JOSEPH F. CRown.

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