US2576333A

US2576333A - Valve grinder

Info

Publication number: US2576333A
Application number: US101570A
Authority: US
Inventors: Earll Frank Lester
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-06-27
Filing date: 1949-06-27
Publication date: 1951-11-27
Anticipated expiration: 1968-11-27

Description

Nov. 27, 1951 .F. L.EARLL V I 1 6,333

VALVE GRINDER v Filed June 27, 1949 2 SHEETS-SHEET 1 fire-.1. 13 I 17.26: 2.

I v I I lI/A INVENTOR. fkq/v/rl. 54241.,

N v-27, ELEARLL 2,576,333

\ VALVE GRINDER Filed June 27, 1949 2 SHEETS-QSHEET 2 Patented Nov. 27, 1951 UNITED s'rA'rss smear OFFICE VALVE GRINDER Frank Lester Earll, Los Angeles, Calif.

Application June 27, 1949, Serial No. 101,570

This invention relates to improvements in valve grinders of the type that are employed to grind the seating surfaces of a poppetvalve and its valve seat, such as those employed on internal combustion engines.

A primary object of the invention is to provide an improved valve grinder which can be easily "and quickly applied to a valve stem and which hasa rotary clamping means that can be clamped upon a valve stem and then rotated to rotate "the valve with relation to its seat. Associated with the clamp is a novel, simple, and durable expansible and contractible means so arranged that when the clamping means is rotated in one direction the expansible and ccntractible means will be expanded so as to cause the valve stem to urge its head against the valve seat in the course of grinding the valve. However, on rotating the clamping means in the opposite direction the expansible and contractible means will be contracted enabling the head of the valve to be lifted from its seat for purposes of inspection of 'the ground surfaces or for the application of adand showing the valve as having been lifted from its seat for purposes of inspection or the application-of valve grindingcompound; I

Fig. 2 is a similar view but illustrating the'position-assumed by the various parts in the course of grinding the valve; I

Fig. 3 is a horizontal section taken substantialy upon the line 33 upon Fig. l in the direction indicated;

Fig. 4 is a horizontal section taken substantially upon the line 44 upon Fig. 2 in the direction indicated;

Fig. 5 is a view illustrating the manner in which the improved valve grinder can be advantageously used;

Fig. 6 is a view in side elevation, parts being shown in vertical section illustrating anralternative form of construction; and Fig. 7 is a view illustrating another manner. in which the alternative form of construction may housed.

3 Claims. (CI. 51-29) Referring to the accompanying drawings wherein similar reference characters designate similar parts throughout, I 0 indicates the manifold of an internal combustion engine within which there is a valve guide H for the valve stem l2 of a valve, the head of which is indicated at 3. The head of the valve is adapted to seat upon a valve seat M; The particular formation of the manifold, the valve guide II, and the arrangement of the ports leading to or from the opening surrounded by the valve seat I will vary considerably with different types of internal combustion engines, and consequently, these features have not been illustrated in detail.

The valve grinder embodying the present invention consists of a sprin housing made upof a cylinder l5 having an external shoulder [6. On the upper end of the cylinder 15 there is screwed or otherwise applied a cap l! which may have its upper surface knurled or roughened as indicated at I8, or which may have a laterally extending arm H! which mayengage the side of the cylinder block of the engine as indicated by dotted lines at 20. The knurling at i8 and the arm is may both be used on the same construction if desired and the primary purpose of the knurling and the arm 19 is merely to hold the spring housing made up of the cylinder, l6 and the cap H against rotation. On the exterior of the spring housing there is rotatably disposed a pulley 2|, this pulley being rotatable between the shoulder l6 and the cap W. This pulley has a cylindrical extension 22 in which slots 23 are formed. A disc 24 is disposed within theextenslon 22 and has threaded apertures therein to receive set screws 25 which are screwed into the apertures through the slots 23. The set screws 25 are adapted to be tightened into clamping engagement on the valve stem l2 and as the set screws extend through the slots 23 they provide an axially slidable but nonrotatable connection between the disc 24 and the pulley 2|.

Within the spring housing there are two axially aligned

compression springs

26 and 21. These compression springs have open convolutions. The lower end of the lower compression spring 21 is anchored, such as by brazing at 28 to the top of the disc 24 and in a similar manner, the upper end of the compression spring 26 is anchored to the cap l1. If the pulley 21 is rotated relatively to the spring housing in one di- ,rection the spring 21 which is anchored to the disc 24 will unscrew out of the spring 26 into the position shown in Fig. 2. After the spring 2'! has completely screwed out of the spring 25,-con-' the head I3 to press against the seat |4 while i the valve is being rotated.

On the other hand, if the pulley 2| is reversely rotated, this will cause the disc 24 to be turned in the opposite direction from that previously mentioned and cause the spring '21 to screw into the spring 26, thus shortening the overall length of the two springs. When the parts assume this condition illustrated in'Fig. 1, wherein it will i .be observed that the disc 24 has been lifted into engagement with the bottom of the spring housing, the valve will be bodily lifted from its seat M to permit of inspection of the seating surfaces and the application of additional valve grinding compound. In this manner it will be appreciated that when the pulley 2| is rotated in one direction the springs will screw out of each other and assume a maximum overall length wherein they are effective to urge the valve against its seat while it is being rotated. Continued rotation after the springs have mutually unscrewed does not involve a continued expansion or extension of the overall dimension of the two springs inas much as their ends merely slide and snap over ,1;

'each other. Howeven'when it is desired to in spect the seating surfaces or to apply additional ,valve grinding-compounding it is merely necessary to reversely rotate the pulley 2| which will cause the two springs to screw one within the otherand thus shorten their overall dimensions enabling the valve to be lifted from its seat.

Anymeans may be employed for rotating the "pulley Hand to this end I have illustrated in Fig. 5 the application of an electric motor 29 which has a shaft 30 that can be inserted through I the valve guide of an adjoining valve. A pulley 3| may be applied to the lower end of this shaft and a belt 32 trained overthe pulleys 3| and 2|.

This motor may be used to drive the pulley 2| in the normal or valve grinding direction which, above explained, will involve the pressing of the valvehead against its seat while it is being rotated. Whenever it is desired to inspect or apply valve grinding compound, the motor 29 may be stopped and the pulley 2| reversely rotated a .few revolutions by hand. Other means may be employed for rotating the pulley 2| if desired. 7

In vFigs.,.6 and '7 an alternative form of constructionis disclosed consisting of a suitable bracket or arm 40 that my be bolted or otherwise secured to a support 4|. .On this arm or bracket there is welded or otherwise secured a .valve guide 42, and a holder 43 is bolted to the arm such as by a bolt 44. This holder has threaded thereto or otherwise secured thereto a sleeve or housing 45 which provides shoulders betweenwhich a pulley 46 is rotatable. This pulley has an extended hub 41 which is slotted to receive set screws 48 that are threaded into a disc 49 that is axially slidable within the hub. A helical spring 50 has its upper ends-fastened within the housing 45 and has openconvolutions. 'This spring is inaxial alignment .withasimilar spring 5,|'- that is anchored or otherwise securedto the disc 49. The pulley 46 is adapted to be driven by a belt 52 driven ofi of a motor 53 which may be mounted on a bracket 54 that is secured to the support 4|. On the arm or bracket 40 there is a, support 55 for an abrasive wheel 56 which is rotatable thereon about an axis that is inclined to the axis of the stem of the valve 51.

This form of construction may be very advantageously employed where it is desired to entirely re-face the seating surface of the valve 51. When the valve is in the position shown in Fig. 6, on

rotating the pulley 45 in the proper direction the the arrangement is such that a smooth bevel will be quickly ground on the setting surface of the valve 51, thus re-facing the valve as desired. Reverse rotation of the pulley 46 will, of course, cause the spring 5| to screw into the screw 50 and result in a lifting of the valve 51 from its engagement with the grinding wheel 56 whenever this is desired. When the valve has been thus re-faced it is desirable to grind its seat complementary to the seating surface of the valve head. To this end the valve 51 is inserted in its valve guide on the engine, as shown in Fig. 7, and the arm 43 may be bolted on top of the cylinder block. A stem 6!! having a screw driver end Si or equivalent means for engaging the valve head of valve 51 is inserted through the valve guide 42 and secured in position by tightening the set screws 48. On driving the pulley 46 in one direction the stem 60 is forced downwardly into engagement with the valve 51 and causes it to press firmly against its seat while being rotated.

produce the desired operation of pressing the head of the valve against its seat while it is being rotated relatively thereto and which upon 'a few reverse revolutions of the pulley 2| will enable the valve to be lifted from its seat to inspect the seating surfaces or apply additional abrasive.

Various changes may be made in the details of construction without departing from the spirit and scope of the invention as defined by the appended claims.

I claim:

1. A valve grinder comprising means providing a spring housing adapted to be applied to a valve stem adjacent an engine manifold, means for holding the spring housing against rotation on a supporting structure, a pulley rotatable on the spring housing, clamping means applicable to a valve stem having an axially movable but non-rotatable connection with the pulley, a pair of aligned helical compression springs in the spring housing having open convolutions and capable of screwing into or out of each other, one spring having its remote end anchored in the spring housing and the other spring having its remote end anchored on the clamping :means whereby when the pulley is rotated in one direction the springs will unscrew from each other and be cooperatively effective to urge the valve stem to seat its head and upon rotation of the pulley in the opposite direction the springs will screw into each other enabling the valve head to be lifted from its seat and means to rotate the pulley alternately in opposite directions.

2. A valve grinder comprising a spring housing, a pulley rotatable on the spring housing, said pulley having a cylindrical extension, a disc within the extension, said disc having apertures therein and being applicable to a valve stem, set screws in the apertures and extending through slots in the extension to hold the disc against rotation relatively to the pulley but enabling the disc to slide axially with relation to the pulley, and opposed helical compression springs having open convolutions disposed in the spring housing, one spring having one end thereof anchored to the disc and the other spring having one end thereof anchored to the spring housing whereby when the pulley is rotated in one direction the springs will mutually unscrew from each other to urge the disc into a position wherein the head of the valve will be urged against its seat and when the pulley is rotated in the opposite direction the springs may screw into each other to enable the head of the valve to be lifted from its seat, and means for stationarily mounting the spring housing on a supporting structure and means to rotate the pulley alternately in opposite directions.

3. A valve grinder comprising clamping means adapted to be clampingly applied to a valve stem,

a spring housing also applicable to the valve stem, means for holding the spring housing stationary, a pulley rotatable on the spring housing having a slidable but non-rotatable connection with the clamping means whereby the clamping means and valve stem may be rotated by the pulley and the clamping means and valve stem may move axially relatively to the pulley, and two helical compression springs within the housing having open convolutions and capable of screwing one into the other, one spring having one end secured to the spring housing and the other spring having one end secured to the clamping means whereby when the pulley is rotated in one direction the springs will screw one into the other causing the clamping means to shift the valve axially in one direction, and when the pulley is rotated in the opposite direction the springs will unscrew from each other causing the clamping means and valve to shift axially in the opposite direction and to be resiliently urged in that direction while the valve stem is being rotated by the pulley and means to rotate the pulley alternately in opposite directions.

FRANK LESTER EARLL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,388,884 Peck Aug. 30, 1921 1,467,674 Kidd Sept. 11, 1923 2,086,321 Kudo July 16, 1937