US1772013A - Auxiliary valve tool - Google Patents

Description

Aug. 5, 1930, Q PALM-GREEN 1,77%013 AUXILIARY VALVE TOOL Filed Aug. 21, 1928 INVENTOR awiz u Patented Aug. 5, 1930 we ears AUXILIARY VALVE 'IOOL Application filed August 21,'19%8. Serial No. 301,063.

In removing the valves from internal combustion engines special tools, known g as .valve spring lifters are employed for compressing the valve spring and raising the washer to permit the removal of the crosspin or other stop. These stops are usually simply pins which extend through diametric holes in the valve stem. v

In these cases all that is necessary is to use the lifter to compress the spring and raise the washer off the pin, and the pin may then be driven out.

However, in some makes of internal combustion engines, a different form of stop is used, the lower end of the valve stem being provided with a circumferential groove and a pair of aw members being associated with the washer in such a manner that the eXpan,

sion of the valve spring causes the washer to clamp the jaw members into locking engage ment with the groove.

However, when the spring has been compressed and the washer raised on the valve stem by means of the lifter, the valve cannot be removed from its place because the jaw members will engage the lock in the groove as soon as the valve stem is raised to the degree in which the lifter has compressed the spring.

As a solution of this difficulty I have invented a novel tool which is used in connection with the lifter for spreading or retractins; the jaw members so that the valve stem will slide readily through'the same;

In general my improved tool comprises 'a' metal bar whose end is bifurcated-and the, bifurcated portion bent at substantially right In the accom an in drawin s, wherein .1 L U y I have illustrated a practical embodiment of the principles of my invention, Fig. 1 is a view partially in section showing my'novel' tool in use tospread the jaw members;

valve stem.

Referring to the drawings, 1 represents .bers will be wedged into 7 Fig. 2 is abottom plan View of the, same;

, Fig; 3 is a perspective of tlietool;

Fig. 4 is a detail showing a portion of the the valve seat; 2 3itsstem. .V.

The stem 3 extends through the back wall 4, of the valve chamber, and has mounte'd'thereon the helical spring 5 which is'compressed the head of the valve, and

between the wall 4 and'the spring washer 6 which is held on the stem by its jaw members 7 which engage and lock in the circumferential groove 8 on the lower end of the stem 3.

The washer 6 is of frustro-conical shape so;

that the end of the spring '5 telescopesdown annular trough 9 which forms thebaseof the washenf The aw members 7 an arcuate in shape over it, the end of-the spring seating in an and are preferably two in number, surro-unding the stem and so contoured that when the washer is thrust downwardly by 'thespring the arcuated lower edges of the jaw memthe'groove 8, as.

shown in Fig. 4.

The upper ends ofthe jaw members are I provided with outwardly bent ears 1Q.to I

prevent their accidental disassemblage from. the washer, but permitting their limited movement relativetothe washer.

In "Fig. .1 I have shown the spring compressed and the washer raised by the fork 11 of a valve lifter inserted under the washer.

Any type of lifter may be employed for...

that purpose, such as that which forms the subject matter of Letters Patent No. 1,586,

835, issued to me on June 1st, 1926.

Experience hasdemonstrated that if, after the spring is compressed and the washers-i raised. disengaglng'the jaw members from the groove, the valve is lifted, as soon as the groove 8 reaches the jaw members, the latter will engage the groove and prevent the removal of the valve.

time and labor wasted in attempting to re Much difiiculty has been experienced an problem I have invented the auxiliary tool 7 shown in the drawings and comprising a rel lOO atively short flat metal bar 12 of convenient Width to be grasped in the hand and having one or both ends, preferably both ends, bi-

furcated and bent at substantially right angles to the body of thebar.

Where both ends of the bar are bifurcated and bent. the bends should be in opposite directions for convenience in use.

Then at each of the ends of the bar a pair of substantially parallel bent fingers 13 are provided. I

After the spring has been compressed and the washer and jaw members raised ofi the ,QIOOVG by means of the lifter, as shown in 15 Fig. 1, my tool is employed, with the fingers 1310f one end of'the-tool straddling the valve stem and disnosed at right angles-to the fork 1-1 of the lifter.

The fingers are then forced upwardly be- 'tween'th'e adjacent edges of the jaivmenibers 17, thus spreading the 'latterlapart. so that the valve stem may be drawn out with the valve.

The ends of the -fingers are itapered or thinned to facilitate their insertion between the i'aw members.

With the use -ofa valve springlifter and my auxiliary tool, the valves of this type of engine may be removed speedily and :cenvenien'tly.

280 Toenabletheitoolfo be used withdifferent diameters of valve stems 'the space between the fingers 13 atone end of the 'tool maybe wider than-atthe other end thereof.

What I desire to claim is '35 A valve lifting tool consistingof a bar ofine'ta". of uniform width ltlHOLlQhOut andfhaving'itsendsbentin opposite directions from *the bocly-. of the'bansaid endsbeing'slotted to providea pair of spaced legs at each end. the

40 slots extending toward the :center of the bar in the nnbentportion thereof, said legs hav- .ing parallel inner faces and the remaining faces of the legs being convergent ilJO the ex "tremities thereof.

"Signed at Pittsburgh, Pa, this 20th day of August, 1928.

PHILIP *PALMGREEN.

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