US1424035A - Multiple-valve-grinding machine - Google Patents

Description

R. M. ROOF. MULTIPLEYVALVE GRINDING MACHINE.

APPLICATION FILED OCT. 29. 1920.

Patented July 25, 1922.

2 SHEETS-SHEET l- INVENTOR. Ease/er /7. Ever.

' A TTORNEYS R. M..RO0F.

MULTIPLE VALVE GRINDING MACHINE.

APPLICATION FILED OCT. 29, I920.

Patented July 25, 1922.

2 SHEETS-SHEET 2.

INVENTOR. 0865 M E00:

I BY

I L-J. 1/14 m M ATTORNEYS stres ROBERT M. ROOF, 01E ANDERSON, INDIANA.

Specification of. Letters Patent.

Patented July 25, 1922.

Application filed October 29, 1920. Serial No. 420,459.

To all whom it may concern Be it known that 1, ROBERT M. R001, a citizen of the United States, and a resident of Anderson, county of Madison, and State of Indiana, have invented a certain new and useful Multiple-Valve-Grinding Machine; 2 and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings in which like numerals refer to like parts.

This invention relates to valve grinding machines, and in particular to power driven machines.

The chief object of this invention is to provide a machine which is adapted to simultaneously grind a plurality of valves of an internal combustion engine.

The chief feature of the invention consists in the means for simultaneously grinding a plurality of valves, and for rotating said valves simultaneously with the grinding thereof to obtain a true and perfect seat for each valve.

Another feature of the invention consists in constructing the machine such that each of the individual mechanisms associated with each valve will be maintained in alignment with the valves.

Still a further feature of the invention consists in the means for normally maintaining the valve driving members in yielding engagement with the several valves.

The full nature of the invention will be understood from the accompanying drawings and the following description and claims.

In the drawings, Fig. 1 is a side elevational view of the invention showing the same applied to a multi-valve cylinder head. Fig. 2 is a transverse sectional view taken on the line 2-2 of Fig. 1 and in the direction of the arrows. Fig. 3 is an elevational view of the right hand end of the invention, as illustrated in Fig. 1. Fig. a is a sectional view taken on line 4-4 of Fig. 3 and in the direction of the arrows and illustrates the means for supplying power to the mechanism and means for rotating the valves during the grinding.

In the drawings 10 indicates a cylinder head or block provided with a plurality of valves 11. Each valve 11 is provided with a groove 12 and a centering pin hole 13, as well as the stem 14 and the seat portion 15.

The cylinder block or head 10 is also providedwith a seat 16, and associated with the valve and the block is the usual spring means 17 for seating saidvalve. All of the foregoing construction is old in the art and needs no further explanation. The invention is illustrated as applied to an internal combustion engine, the cylinder head of which contains over-head valves, and said valves in the present instance are sixteen in number, four of which are associated with each of the engine cylinders, two being the exhaust valves and two being the intake valves. However, the principal construction of the machine may be applied to any multi-valve engine for simultaneously grinding all valves thereof without departing from the broader features of this invention.

The machine constitutes a skeleton framework provided with an operating mechanism, and said framework in the present instance comprises a base plate 20 in spaced and parallel relation with a second plate 21, said plates being secured together in said spaced relation by the standard portions 22. The standard portions are preferably tubular so as to receive bolt members 23 by which the skeleton framework is secured to and upon the engine head 10 by the nuts 24. The framework of the grinding mechanism is thus rigidly secured to the cylinder head 10 and in spaced relation therewith by means of the tubular spacing standards 25, associated with the framework 21. As illustrated in Figs. 1 and 3, it will be understood that the bolts 23 are so positioned that the same are receivable by the holes by which the cylinder head is secured. to the cylinder block by other bolts means. It will, of course, be understood that this machine is used chiefly in quantity produc tion, and, therefore, each skeleton framework is constructed to correspond to each of the cylinder heads to be associated therewith, but it will be understood that all of the multiple grinding machines are constructed in a similar manner, barring dimensions and the relative positioning of the several parts.

The mechanism associated with each valve to grind the same comprises a valve driver 30 provided with the usual driving face 31 and centering tooth 32. The valve driver 30 is provided with an annular collar portion 33 and a stem portion 34:. Associated with each valve driver is a drive shaft 35, which drive shaft is hollowed out at 36 to form a spring chamber 37 in which the spring 38 is positioned, one end of said spring bearing against the endof the opening or chamber 37 and the other end of said spring bearing against the collar portion 33, which collar portion is slidable in the chamber portion 37. The drive shaft is also recessed at 39, which recess communicates with the chamber Wand is positioned centrally thereof. The recess 89 receives and slidably supports the stem 34% of the valve driver. Thus. the walls of the recess 39 and the walls of the chamber 37, by means of the collar 33 and the'stem 34-, axially align the valve driver with the drive shaft. The drive shaft 35 is slidably mounted in the frame 21. the latter being provided with the bushing 40 to facilitate said. slidable movement. The plate 20 isalso provided with a bushing 4:1. and the shaft 35 extends through the bushing. Thus, the shaft 35 is maintained in alignment the parallel plates 20 and 21. The shaft 35 is provided with a grooved portion 42 in the groove 43 of which is positioned the div'ded yoke -14. which oke is carried by a lifting or elevating arm aid arm being rigidly secured to a rock shaft 46. by the bolts or set screws 46 which rock sh aft is manually rocked by means of the hand lever 47. Thus, when the handle l-l isactuatech it willbe understood that the valve driver is elevated. The shaft 16 is rotatably supported by means of the brackets 48 secured to and upon the frame 20. Upon the shaft 46 is another arm 49, which arm bears against one end of the spring 50. The spring 50 is concentric with and mounted upon a bolt 51. which bolt is supported upon the framework 20 in any suitable manner. The tension of the spring 50 is regulated by means of the washer 52 and a wing nut 53 said washer retaining one end of the spring 50 the other end, as hereinbefore stated. bearingupon the arm l-Q. Thus. the spring 50 is adapted to maintain the drive shaft 35 .in the lower position through the arm 49. shaft 46 and arm 45.

Since one valve driver has been descr bed in detaih'including the means for elevatingand the means for yieldingly maintaining the driver in the lowered position. a further description of the other valve drivers and the operation thereof will be omitted, it will be understood that as illustrated in the clrawings a plu ality of valve drivers are adapted to be associated with the rockin shaft to. the elevating handle 4:7 and the adjustable yielding maintaining spring 50.

The means for oscillatingthe valve driver 30 comprises a long pinion 55, which long pinion is suitably secured or formed upon the drive shaft 35.

and transmits motion from the drive shaft to the valve driver 30 by means of a pin and slot connection, said drive shaft being slotted at 54 and said valve drive stem being provided with a key 154 seatable in the slot 54:. A rack 56 is slidably supported upon a bracket 57. The rack 56 is provided with an elongated slot 58 through which extends a pin or bolt 59 provided with the nut 60 or equivalent means may be substituted so as to slidablv support said rack 56 upon the bracket 0 and guide the same as well. The rack 56 is provided with teeth adapted to engage the teeth of the long pinion and since the pinion 55 is a long pinion, it will be understood that the shaft 35 may be elevated or lowered without removing the pinion from the rack.

The means for reciprocating the rack is as follows: Depending from the base plate 20 are a plurality of brackets 81 which support the guide rod 62. Upon the guide rod 62 is slidably supported a carriage member 63. The carriage member 63 is provided with an elongated slot or opening Get in which is positioned a circular cam member (35. The circular cam member 65 is eccentrically positioned with respect to the rotating shaft 66. which. shaft 66, if desired. may be. and preferably is maintained in fixed and aligned position by means forwardly extending brackets 67 formed upon or otherwise secured to the base plate 2']. The rack 56 is suitably secured to the reciprocating carriage 3 such that rotary movement of the shaft 66 will be transformed by means of the eccentric cam 65 into a reciprocating motion which is transmitted to the rack 56.

The means for indexing or rotating the drive shaft'35 so that the valve will not be ground into one position but will be indexed or rotated while the grinding valve is being oscillated. comprises in this instance means associated with the rack 56 and reciprocating carriage 63. This means comprises screw 68 suitably secured to and carried bv the carriage 63, which screw member may be revolved by means of the crank handle 69. A. nut member '70 is similarly threaded and adapted to receive the screw member 68. The nut member 70 is rigidly secured to the rack 56 by means of the bolt and nut 71 and 72 respectively. Thus. rotation of the crank handle 69 will move the carriage G3 longitudinally of said rack. or vice versa. thus rotating the pinion 55. and therefore. the valve 1?]. Rcciprocation of the rackoti thereupon will grind the valve 53 in the new position.- 30th rotation and reciprocation may. if desired. occur simultaneouslv. Furhermore, if do sired, the rotational 'eature hereinbefore described instead of beingmanually operated. may be; mechanically operated and autoinatic. lVhen automatically rotated or indexed, automatic means should be provided for returning the rack to its initial position upon the complete rotation of the several valves 15.

As shown clearly in Figs. 2 and 3, the several pinions are so positioned in alignment with each other that a single rack serves to drive said valve drivers. Similarly, since opposite each valve driver there is positioned a second valve driver, it will be understood that a single rack provided with teeth upon opposite sides thereof will be sufficient for driving all of said valve drivers simultaneously. Similarly, since the indexing mechanism is associated with the single and common rack, all of the valve drivers will be simultaneously indexed. If desired instead of the dual yielding maintaining springs 50 and the dual elevating levers 4:7, a single spring member may be used and a single handle member may be used without departing from the broader features of the invention.

In certain multi-valved motors, one or more valves is always in the elevated position.

With motors of this type, the respective set screws 46 may be loosened, thereby permitting the valve to remain in the elevated position during the grinding operation without unduly compressing the spring 38 or rocking the shaft 46 so as to cause the other drivers to become disengaged from their respective valves. After all the seated valves have been ground, rotation of the engine crank shaft the proper angular distance will close the unground valves and open one or more of the other valves. The properset screws -16 are then loosened and those previously loosened are again tightened and the valves which were originally in open position are ground.

While the invention has been described in great detail, it will be understood that many modifications thereof are possible and will readily suggest themselves to those skilled in the art, a few being suggested herein, and all of these modifications are considered to be within the broad purview of this invention, reference being had to the appended claims.

The invention claimed is:

1. In a valve grinder, a frame, avalve engaging and driving member, a holder in said frame for said driving member, a pin and slot connection between said holder and said valve engaging member permitting longitudinal but preventing rotational movement therebetween, yielding means associated with said valve engaging member and said holder for normally maintaining the valve engaging member in valve engaging ing member, a pin and slot connection between said holder and said valve engaging member, yielding means associated with said valve engaging member and said holder, means for oscillating said holder, means for raising said holder, and other yielding means for normally maintaining said valve engaging member in the lowered position.

3. In a valve grinder, a plurality of valve engaging and driving members, gear means associated with said valve driving members, other gear means in mesh with said first mentioned gear means for oscillating said valve driving members, a single means for elevating all of said valve driving members, and a single means for normally maintaining all of said valve driving members in the valve engaging position.

at. In a valve grinder, a pair of valve engaging and valve driving members, a pinion associated with each valve member, a rack positioned between said pinions and provided with gear teeth upon opposite sides in mesh with said pinions.

5. The combination with an internal com bustion engine, including a pair of valves, of a valve grinding mechanism for simultaneously grinding each of said valves, said mechanism comprising a pair of supporting plates in spaced relation with each other and rotatably supporting a pair of valve engaging and valve driving members in alignment with the valves, means for driving said valve engaging and valve driving members, said driving means being positioned between said spaced supporting plates and supported thereby and between said valve engaging and valve driving members, and means associated with said plates for securing the grinding mechanism to the internal combustion engine.

6. In a valve grinder, a plurality of valve engaging and driving members, gear means associated with said valve driving members for driving the same, means for raising and lowering said valve driving member, and

means for maintaining one of the valve driving members in the elevated and non-grindingposition, and other of the valve driving members in the lowered and valve grinding positions.

In witness whereof, I have hereunto affixed my signature.

ROBERT M. ROOF.

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