US1881551A - Bushing attachment for valve grinding - Google Patents

Description

Oct. 11, 1932. B. H. HAWKINS 1,881,551

v BUSHING ATTACHMENT FOR VALVE GRINDING Filed Aug. 15, 1950 jgul,

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Patented Oct. 11, 1932 UNITED STATES PA TENT EFF-JACKIE,

' BERT in; HAWKINS, "or ROYAL ease, rmcHIeAn, Assrenon e Mcconn Imnm'roae MFG. 00., or person, MICHIGAN, :A eon-rona'rron or Meme 7 JBUSHING ATTACHMENT FOR VALVE GRINDING I vApplication file'd'August 15. 1930. Serial No. 475;462.

This invention relates to a device in 'the nature of an attachment whereby the split hushing 'which normally serves'as a guide for the stem of the valve in the engineof the present Ford ModeWA car-maybe employed to holdf-and guide thevalve when grinding it to its seat.

-The device'of my invention is in the form a of a U-shape metal clip so constructed and designed to'besnapped o-ver-the split bushing adj acentthe end which is-uppermostwhen the bushing is inverted for valve grinding, so as to hold the separa'ble 1 parts of the bushing H together, not only during the grindingpper ai ti-onQhut also when the valve is removed "from time to time to notethe progress of the grinding. The device is simple in construction and inexpensive to make, and when snapped over the split bushing, efi'ectivelyiholds the parts together, soflthat they will remain on the valve-stem when removing the valve from and replacing :it back into the block.

The device of myiinvention is so constructed and designed that it will engage the split 5 bushing in the region ofthe lateralflanges-on the separable parts of the bushing,and serve as'a seat or support forthe bushing, when the 'latteriis usedx-as a holder for theval-vedu-ring the grinding operation.

- The device of my invention is-also so con structed and designed as to have a snug 'fit about that portion of the bushing which is machined, namely, the portion which fits in the bore 0f the block inthe normal :position of the bushing-as avalve guide. Tocarryout this feature :of my invention, I so make the clip that the distance between its ends at the entrance of the U isslightly less thanthe outside'diameter ofthe hushi-ng where theclip' snugly engages the same. This :I accomplish by'forming the curvature 0f the clip at this portion of lengthslightly "greater than half the circumference of the outside of "the I bushing Where the clip engages the same, so that the entrance end of the'clip is slightly less in the widththan the outside diameter of the bushing. Tlieiresult is that when the clip is applied to the bushing, the entrance end is caused to he spread apartto'passnver the full diameter ofthe bushing, and when the clip is completely on the bushing, the entrance end of the clip will engage the bushing for more than half its circumference, and thus effectivelyhold-the clip on the bushing.

Inthe accompanying drawing Fig. 1 shows the valve conditioned for grinding withfthe clip of my invention on'th'e inverted bushing;

Eig. 2 is :a top plan view of the clip-and the bushing;

Fig. 3 is a horiontal section taken-on line 3- 3of Fig. 1;

ig. i4 is-a similar view showin -the clip heing a'pplied to the bushing; and

Fig. 5 is a perspective view of the clip.

In the drawing, 1 indicates the over-hang on the valve side (if :ac'ylinder block-of {an L-head motor, such as is employed in the present Model A Ford car. 2 indicates avertical-hole or bore in the overhang lo'elow the "gas "chamber 3, which is formed in the overhang-below the seat-4 ofthe'va'lve 5 which'is of the in motors ofthis kind.

The cham'ber 3 communicates with the intake or exhaust passage of the cylinder block, depending on whether the valve is an intake valve or an exhaust valve. I The stem 6 =02f the valve extends downward through the bore 2 and terminates short of the bearing 7 for the push rod 8 which is poppet type as employed actuated by the associ ated cam on the cam spring which, through a cross-pin adjacent the -lower "end of the stem, closes the valve on its seat. Tl1e-bushingservesto hold the valve centr'al with respect to its seat, and.

also to guide the valve in its upward and downward movement.

When conditioning the Valve for grinding, the spring and the "cross-pin, aswell as the bushing 9, are removed. This is facilitated by havingthe bushing made in two longi'tw fiangeslO on theunder-side of the over-hang and held against the shoulder 11 by the coil dinal separable half sections, as clearly shown in Fig. 2. By the use of the device of my invention inconjunction with this bushing, the latter may be used to hold and centralize the valve while grinding it to its seat. I

My improved device is in the form of a U-sha'pe clip, made from sheet'metal. It is designed to fit over the outer side of thebush- 'ing, in the -region'of the flanges 10, and has a grooved or channel section 12' to accommodate or receive these flanges. The, portion 13 of the clip is made to snugly engage the portion of the bushing. immediately below the flanges This portion 13 is accurately made, so. as to conform to the curvature of the portion of the bushing below the flanges, whichis machined to properly fit in the bore 2.' In making the portion 13, "it

1 'is given a circumferential length, slightly greater than half thecircumference of the outer side of the bushing, as shown in Fig. 3. This makes the widthof the clip at its entrance end slightly less than the diameter of the bushing.

tion lid conforms in length to the length of this chord. "Consequently when'the clip is forced onto the bushing; this entrance end will be spread apart as it passes over'the full diameter of the bushing,*and when the clip portion 13 comes to rest againstthe outside of the bushing, it will be snugly held on the bushin by reason of its entrance end extending slightly beyond half of the circumference of the bushing.- The other part 14 of the clip abovethe channel section 12 need not jfit tightly about the outside of the bushing, asthe holding action of the clip is confined to the portion 13 which. fits'about the machined [part ofthe bushing. .The portion of thebushing above the flanges 10 is usually not smooth, and has a taper as indicated in i Fig. 1;

; Before grinding the valve, it is removed from the engine block. The two parts of the bushing are then placed about the valve stem with therbushing inverted, so as to bring its flangesuppermostf' The clip is then applied to the bushing overthe flanges, and hold'sthe bushing on the stem. wThen the parts are inserted back into the block. The bushing enters the bore 2, and the lower edge'of the portion 13 of the clip seats against the upper 1 side of the block at the bore: and the Valve is thus held central for grinding as shown in Figyl. The valve may now be ground in the'usual manner. I-tmay be lifted from its seat fromtime to time, and in fact may be completely removed from'the block whenever necessary, Without the bushing falling off of the stem due to the fact that the clip holds the two parts of the bushmg together on the stem. The bushing is therefore in position to re-enter the bore 2'when the valve is now lower end, of the bushing-when the flared lower end '15 of the stem is drawn up adjacent the same when lifting the valve from the block. Thus thetwo parts of the bushing'cannot be spread orwedged apart by the flared lower end of the valve stem and the bushing sections thereforeiare maintained in proper relation about the stem so as to re-enter thebore 2 by merely dropping the valve back to its seat, as the lower end of the bushing is not disturbed to interfere with the easy. entrance of the bushing into the bore. After the valve has been ground, the

bushing is removedloy removing the clip, and

then the bushing is inverted back to'its original position, and applied inthe usual manner with the spring to guide :and holdthe valve during the normaloperation of the engme. V My device is extremely simple in structure and inexpensive to make. It is an attachment for use with the regular split bushing with which these engines are-equipped, and thus enables'a valve to bev ground truer, because thebushing as made by the engine manufacturer is retained and used during the grinding operation, instead of depending on some other form of holder which might not have the accuracy of'fit as the bushing which is supplied with the valve by the engine' maker. The channel section 12 of the device not only strengthens it, but by fittingabout the flanges 10 holds the device in place on the bushing. The device also lifts the two halves of the bushing out of the bore 2 when removingthe valve. The side walls of the groove or channel also add to the strength of the deviceas a spring. Should the device wear and become loose from continued use, it can be closed slightly so that it will again fit. the bushing firmly, increasing the life of the device. The edges of the device at its entrance end are fiared'outwardly to facilitate snapping the device on the bushing. I I claim as my invention:

' All t achment for use with the'longitudinally divided flange provided guide bushing of a poppet valve of an internal combustion engine while grinding the valve, comprising a U-shape clip to fit about the exterior of the bushing for holding its parts together on the stem of the valve, said clip having means to accommodate the flanges on the bushing.

' the entrance end of theclip being slightly less in width than the full diameter of the same to hold the stem of the valve.

2.'An attachment for use with the longitudinally divided flange provided guide bushing of a poppet valve of an internal com bustion engine while grinding the valve, comprising aU-shape metal clip to be applied over the exterior of the bushing for holding 7 its parts together on the stem of the valve,

said clip having a channel shaped section to receive the flanges on the bushing, said clip having portions on opposite sides of said channel section with one portion fitting against the exterior of the bushing.

' 3. An attachment for use with a longitudinally divided flange provided guide bushing of a poppet valve of an internal combustion engine while grinding the valve, comprising a U-shape metal clip to be applied overthe bushing for holding its parts together on the stem of the valve, said clip having a channel section to receive the flanges of the bushing, said clip having sections on opposite sides of the channel section, one of said sectionshaving a curvature conforming to that of the outside of the bushing and having a circumferential length slightly more than half the circumference of the outside of the bushing.

4. An attachment for use with a longitudinally divided flange provided bushing for a poppet valve of an internal combustion engine While grlndlng the valve, comprising a U-shape metal clip to be appliedover the outer side of the bushing for holding its parts together on the stem of the valve, said clip having a channel section to receive the flanges on the bushing, said clip having portions on opposite sides of the channel section extending part way about the bushing,

outside of the bushing so that the clip in being applied to the bushing will snap over the parts of the bushing on the 5. An attachment of the character described comprising a U-shape metal clip adapted to be applied over the outside of a longitudinally divide-d flange provided valve guide bushing for holding its parts together on the stem of a valve, said clip having a channel shaped section intermediate its ends to receive the flanges of the bushing, the portions of the clip on opposite sides of the channel section being shaped to fit about the bushing with one portion made to conform to the curvature of that part of the bushing which fits in the bore in the cylinder block,

In testimony whereof Iaflix my signature.

BERT H. HAWKINS.

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