US1722880A - Valve-grinding machine - Google Patents

Description

JuIy 30, 1929. F. o. ALBERTSON 1,722,880

VALVE GRINDING MACHINE Filed June 9, 1924 5 Sheets-Sheet 1 Irufe vital Earns Qffle/ 5012 July 30, 1929. F, o, ALBERTSON 1,722,880

VALVE GRINDING MACHINE Filed June .1924 s Sheets-Sheet 2 I razzs 0. 1425019322 F5 &

W WM! d f g gys- S 0, 1929. F. o. ALBERTSON 1,722,330

VALVE GRINDING MACHINE Filed June 9, 1924 5 Sheets-Sheet 3 Patented July 30, 1929.

UNITED STATES PATENT OFFICE.

IRAN S O. ALBERTSON, OF SIOUX CITY, IOWA, ASSIGNOB TO ALBERTSON 6o COMPANY 01 SIOUX CITY, IOWA, A. CORPORATION OF IOWA.

. VALVE-GRINDING MAOHINE.

Application filed June 9,

The present invention relates to valve grinding machines, and has particular reference to a bench unit for grinding and refacing internal combustion engine valves which have been removed from the engine.

The machine is also adapted to the performance of other grinding, reaming, and cutting operations, as I shall presently describe.

One of the particular objects of the invention is to provide such a machine which W111 permit of wide varieties of adjustment within a machine of relatively small compass, and which adjustments may be obtained 1 fuickly and easily.

A further object is to provide such a machine in which the grinding wheel is supported on one slide, and the work holding means is supported on another slide, these two slides being movable substantially at right angles to each other on the supporting bed of the machine. This arrangement of slides facilitates securing adjustments, as mentioned above.

A further object is to provide such a machine in which the work holding stock is swiveled to its slide at a point forward of the center of the upright driving shaft which extends through the stock for transmitting power to the work holding chuck. By thus locating this pivotal center closer to the chuck and closer to the work held thereby, the angular adjustment of the work involves a smaller sweep of the work, and in consequence the linear shifting of its slide for a given angular adjustment is materially reduced.

A further object is to provide improved means for transmitting power to the chuck of a work holding stock pivoted in this manner; and to provide improved means for connecting and disconnecting this power transmitting means.

A further object is to provide im roved guide means and guided mountings or the two slides on the machine bed which will be of simple and accurate construction, and of low manufacturing cost.

A further object is to provide an improved arrangement of chuck, and valve stem aligner therefor.

Other objects will be hereinafter set forth 1924. Serial No. 718,713.

in the accompanying description of a preferred embodiment of my invention.

In the accompanying drawings illustratmg this preferred embodiment:

Figure l is a front elevation view of the machine;

Figure 2 is a to plan view of the same;

Figure 3 is an inverted plan view; Figure 4 is a vertical sectional view through the work holding stock;

Figure 5 is a vertical sectional view taken on the plane of the line 55 of Figure 2;

Figure 6 is a vertical sectional view taken on the plane of the line 66 of Figure 3.

Figure 7 is a longitudinal sectional view through the axis of the Work holding stock.

Figure 8 is a fragmentary front elevational view showing a work supporting attachment mounting on the work holding slide; and

Figure 9 is a detail sectional view of the idler pulley mounting.

The entire machine is assembled upon a frame or base 10 which is in the form of a rectangular box-like casting having closed sides 11 and a transverse partition 12, the latter being shown in Figure 3. This base casting, together with suitable guide rods, which I shall presently describe, constitute a bed on which are supported a grinding Wheel slide 14 and a work holding slide 15. The grinding wheel slide 14 is preferably arranged to move from front to back of the base casting 10, and the Work holding slide 15 is arranged to move substantially at right angles thereto or laterally of the base casting on the left-hand side of the slide 14.

As shown in Figure 3, the top of the base casting 10 is formed With a rectangular opening 16 extending from front to back of the base for receiving the slide 14; and to the side of this'opening 16, another rectangular opening 17 is provided in the top of the casing for receiving the other slide 15. Supported substantially flush with the top of the base casting in the opening 16 are two guide rods 18 on which is guided the slide 14. These rods 18 are supported at their ends in bosses 19 extending inwardly from the inner sides of the side Walls 11. At two or more points on its underside, the

slide 14 is formed with semi-circular guide recesses 21 which fit over the guide rods 18, whereby the guide support of the slide 14 is substantially entirely on these rods. These guide rods are preferably of hardened steel and may be inserted through holes drilled through the front or rear wallof the base casting in alignment with the corresponding bosses 19. I find the use of these cylindrical .guide bars of hardened steel a decided advantage. They are inexpensive, yet form accurate guides and avoid the expense of machining guideways in the base casting.

A confining bar 23 (Figures 3 and 5) is secured to the underside of this slide by cap screws 24 adjacent the guide recesses 21 at the forward end of the slide, this bar having corresponding semi-circular recesses 25 embracing the lower sides of the guide rods 18. The slide 14 is shifted on the bed thus formed through the rotation of a shaft 26 on which is mounted a feed screw 27. The front and rear ends of the shaft are sup orted in bosses 28 on the front and rear wa ls of the base casting, and the shaft 26 extends forwardly from the front of the machine for supporting an operating crank 29. A stop collar 31 may be pinned to the shaft 26 at the rear end of the feed screw 27. A semi-circular boss 32 projects downwardly from the slide in the plane of the oonfinin bar 23, this boss having a thread 33 meshing with the feed screw 27 As the slide 14 is moved backwards and forwards, it is desirable that the rectangular opening 16 remain covered so that iron'filings and other foreign matter shall not get down into the working mechanism below the top of the base. To this end I provide a slidable apron 13 inserted between the slide and the base at the forward edge of the machine. This apron has a downwardly turned outer flange which is adapted to engage the forward edge of the base and hold the slidable apron in covering positionwhen the slide is shifted backwardly. As shown in Figure 3, the rear edge of this apron has a downwardly turned flange 13' which is in position to be engaged by the confining bar 23. A tension spring 22 is connected to the flange to pull the apron backwardly against the forward edge of the base, or against the bar 23.

Referring now to Fi res 1 and 2, it will be observed that the e ectric motor 34 for driving the machine is bolted to the rear end of the slide 14. A bearing support 35, having a ribbed base 36 is secured to the front end of the slide 14 by bolts 37, this bearing support 35 carrying the shaft 38 on which is mounted the grinding wheel 39.

The ri ht-hand end of the shaft 38 carries a small anged pulley 41 over which tracks a belt 42 extending from a larger flanged pulley 43 on the shaft of the motor 34. The motor shaft also carries two other flanged pulleys 44 and 45, of different sizes, for receiving the belt 46 which transmits power to mechanism arranged to drive the spindle of the work holding stock, which mechanism I shall presently describe. r

i The work holding stock, designated 47 in its entirety, is mounted upon the laterally moving slide 15 so as to be shiftable therewith. This slide has the semi-circular bearing surfaces 20, projecting from its underside, for mounting on the guide bars 30, similar to the provision of the recesses 21 for the guide bars 18 of the slide 14. These two guide bars 30, which are also preferably constructed of hardened steel, are mounted at their ends in bosses 30, on the partition 12 and the end wall 11.

As shown in Figure 6, the slide is retained against upward displacement from the bars 30 by retaining clips 40 having guide recesses embracing the lower sides of the rods 30. Each clip 40 is secured to the slide by a cap screw 50 passing through the clip and threading into the bottom of the slide. A spring washer 60 is confined between the head of the screw 50 and the bottom of a counter-bore in the clip 40 to resiliently urge the bottom of the clip against the bottom of the rod 30. Endwise sliding motion is imparted to the slide 15 through the oscillation of a long operating arm which is clamped to an operating shaft 80 extending through the front wall of the base casting 10. This shaft has bearing support in a bearing boss 80 formed in the front wall of the base casting (Figure 6), and directly inside this front wall this shaft carries a spur gear'90 which meshes with rack teeth 100 formed on the underside of the slide 15 directly inside the opening 17. It will be evident that by oscillating the arm 70, the slide 15 can be reci-procated to feed the work held by the work supporting stock 47, towards and away from the emery wheel 39. The rectangular opening 17 in which the slide 15 is guided, may also be provided with a slidable apron 113, similar to the apron 13, for retaining the opening 17 closed when the side is moved to the left. This apron is also preferably provided with a stop shoulder adapted to engage with a shoulder on the slide, together with a spring for moving the slide in one direction, similarly to the arrangement for the slide 14.

Referring now to the construction of the work holding stock 47 it will be observed from Figure 4 that it comprises a base plate 48 having an upwardly extending standard portion'49 on the upper end of which are formed spaced bearing hubs 51-51. The

spindle of this stock comprises a sleeve 52.

having a bearing support in both hubs 51 and supporting at its front end a conventional design of chuck 53. This chuck need not be described in detail, itbeing apparent that any preferred type may be employed, suitable for holding the stems 54 of the valves 55.

Rigidly mounted on the sleeve 52, intermediate the bearing hubs 51 is a bevel gear 56 which meshes with a bevel pinion 57 mounted on a drive shaft 58 extending downwardly through the standard portion 49 of the stock. The space between the bearing hubs 51 is closed on the bottom and sides by a housing portion 59 formed integral with the hubs 51 and a removable semicircular cover 61 which closes the top of this gear housing.

The sleeve 52 is held against shifting by the chuck 53 at one end, and a pair of nuts 107-107T screwing over the other end. Inserted into the sleeve at this latter end is a floating aligner 108 which is adapted to act as a guide and a stop for the end of the valve stem 54. The tapered socket 109 in the end of the aligner receives the end of any size of valve stem and thereafter centers all remaining valve stems of the same size axially of the chuck 53. The aligner can readily be shifted to accommodate longer or shorter valve stems, and is held in any desired position by a set screw 111 threading down through the knurled collar 112.

A bearing sleeve 62 is anchored at its upper end in the stock 47 and extends down through an arcuate slot 63 in the slide 15 to a point below the top of the base casting, as shown in Figure 4. The arcuate slot 63 permits of angular adjustment of the entire work holding stock, as I shall presently describe. The bearing sleeve 62 supports an upper bearing bushing 64 and a lower bearing bushing 65 in which the shaft 58 is journaled. Pinned to the lower end of the shaft 58 is a bevel gear 66 which receives power from a bevel pinion 67 secured to the end of a drive shaft 68 extending horizontally towards the right-hand end of the machine, below the top of the base casting 10. As shown in Figure 3, this shaft extends through a sl t 69 in the partition 12 and through anot er slot 71in the end wall 11 for mounting the two flanged belt pulleys 72 and 73 beyond the end of the base casting for receiving-the driving belt 46. By shifting the belt 46 from one pair of pulleys 44 and 2 to the other pair of pulleys 45 and 73, it will be obvious that. ,difi'erent speed ratio may be given the shaft 68. V

The outer end of this shaft is journaled in a bearing 74 which has a swiveled mounting depending from a bracket 75. This syviveled mounting may comprise a pivot bolt 76 passing down through a boss 7 7 on the bracket and threading into a boss 78 extending upwardly from the bearing. The bracket 75 has an attaching flange 79 which is secured by bolts 81 to a flange 82 extending upwardly from the lateral margin of the slide 14, whereby this bracket will shift back and forth with the movement of the slide.

The swiveled support of the bearin 74 permits of the lateral swinging of the s aft 68 in accordance with the angular adjustments given the work supporting stock 47, as will presently appear. To accommodate these angular adjustments and the shifting movement of the slide 15, the shaft 68 is also constructed for linear extensibility by employing two telescopic sections 68 and 68', the former telescoping into a bore 84 in the latter. A spline 85 maintains a driving connection between the two telescopic sections at all times.

The belt 46 tracks over an idler pulley 117, which is also mounted on the framelike bracket 75 to move with the slide 14. As shown in Figure 9, this pulley is journaled on a bearing arm 115 projecting from a hub 116. This hub is secured to a shaft 116 which has bearing support in extensions from the bracket 75. A spring 118, compressed close to solidity, is confined between the end of the hub and the bracket for holding the idler at any desired angle. A knob 119 is mounted on the end of the shaft 116.

Different valves 55 often have widely different angles of valve face, some having substantially standard angles of 30 degrees, 45 degrees and 60-degrees, and others having intermediate or greater or smaller angles. It will, therefore, be apparent that the horizontal axis of the work holding stock 47 must be capable of angular adjustment on the slide 15 so as to enable the face of the valve 35 to be disposed at its proper angle relative to the face of the grinding wheel 39. It is practicable to arrange the work holding stock for swiveling movement about the axis of the vertical power transmission shaft 58. Owing to the considerable distance, however, between this axis and the conical face of the projecting valve 55, the amplitude of swing of the valve in going from one extreme of angular adjustment to the other is considerable relative to the direction of movement of the slide 15. This arrangement would, therefore, involve a long .traverse of the slide from one limit to the other and would necessitate a longer machine.

To the endof reducing the amplitude of swing of the valveand the necessary linear travel of the slide 15in the making of these various angular adjustments, I propose pivoting the work supporting stock at a point relatively close to the head of the valve. Accordingly, I extend a pivot lug 87 forwardly from the base 48 to a point substantially under the chuck 53. A pivot bolt 88 passes down through this pivot lug 87 and screws into the slide 15. It will be apparent that the pivot lug 87 can be extended for-- wardly still further to reduce the length of the work projecting beyond this pivotal axis of the stock;

The rear end of the base plate 48 slides upon two arcuate guide surfaces 89 formed on the top of the slide 15 concentrically of the pivot screw 88. Gauge lines 91 may be marked on these guide surfaces for indicating the angular position given' the stock 47 The slot 63, through which extends the hear. ing sleeve 62 and shaft 58, is also of arcuate form concentric of pivot screw 88 to accommodate this swiveling adjustment of the stock. An arcuate cover plate 92 is attached I to the work holding stock for covering the slot 63.

For interrupting the drive to the chuck 53 I have provided means for lifting the bevel pinion 67 out of mesh with the bevel gear 66. This means comprises an operating handle 93 mounted on the end of a shaft 94 supported in a suitable hubon thebase- 48 of the stock. Theinner end of this shaft 94 carries a collar 95 from which extends an eccentric crank pin 96. This crank pin ongages a hump 97 bent laterally in a shifting rod 98 extending downwardly alongside the bearing sleeve 62. The shifting rod 98 may be guided in a longitudinal groove in the wall of the sleeve 62. The lower end of the rod 98 is hooked through an opening 99 in a collar 101, supported on the lower end of the sleeve 62. The bottom of this sleeve 62 has an outwardly extending stop flange 102 on which the collar 101 rests, the collar having free pivotal movement around the sleeve 62. Extending from the upper part of the collar 101 is a bracket portion 103 from which depends a bearing hub 104. The end of the drive shaft 68 is journaled in this bearing hub, the boss 67' of the bevel pinion 67 abutting the end of the hub 104 and holding the shaft section 68 against shifting motion in one direction. The collar 105, secured to the shaft section 68 on the other side of the hub 104, holds the shaft against shifting motion in the other direction.

It will be apparent that by oscillating the operating handle 93, the crank pin 96 can be swung upwardly to thrust the rod 98 upwardly and thereby lift the bevel pinion 67 out of mesh with the bevel gear 68. This affords a'quick and easy method of inter rupting the drive to the work supporting chuck, so that valves may be quickly sub-- stituted therein without necessitating the turning off of the electric motor 24.

For grinding and truing valve stem ends, etc., I propose mounting a separate fitting on the laterally movable slide 15 for properly supporting these valve stems. As shown in Figure 8, this fitting consists of a small cross-buck 121, in the upper forks of which the valve stem is adapted to be rested. The slide 15 has two spaced mounting surfaces 122 near its inner front corner, upon which the fitting is mounted. A bolt 123 extends up between these mounting surfaces and is adapted to pass up base of the fitting for receiving a nut 124 on the upper side thereof. The fitting can quickly be applied in position to hold the valve stem end at right angles to the flat side of the emery wheel.

I do not intend to be limited to the particular details herein shown and described except as they are defined in the appended claims.

I claim:

1. In a machine of the class described, the combination of a base, a first slide movable thereon, a grinding wheel supported on said slide, an electric motor on said slide, a second slide movable on said base, power driven work holding means on said second slide, a shaft extending below the top of said base, a bearing for one end of said shaft moving with said first slide, means connecting said electric motor with the latter end of said shaft, a bearing for the other end of said shaft moving with said second slide, and means for connecting this other end of said shaft to said work holding means.

2. In a machine of the class described, the combination of a base, a first slide movable thereon, a bearing mounted on said slide, a grinding wheel journaled in said bearing, an electric motor mounted on said slide, means connecting said electric motor with said grinding wheel, a feed screw for moving said slide substantially transversely of said base, a second slide movable on said base, a work holding stock supported for pivotal swinging movement on said second slide, rack and pinion means for moving said second slide substantially at right angles to said first slide, a driven member passing down through the standard of said work holding stock, a substantially horizontal shaft extending below the top of said base, shaft having swiveled support about the axis of said driven member, gears connecting said shaft with said driven member, a swiveled bearing for the other end of said shaft, a belt for transmitting power from said electric motor to said shaft, and a telescopic joint associated with said shaft for permit ting shifting movement of said second slide.

3. In a machine of the class described, the combination of a base, a,first slide movable thereon, a grinding wheel and an electric motor on said slide, a second slide movable on said base, power driven work holding means on said second slide, a shaft extending below the top of said base, a bearing for one end of said shaft moving with said first slide, means connecting said electric motor with the latter end of said shaft, a bearing through a hole in thea bearing for said for the other end of said shaft moving with said second slide, and means for connecting and disconnecting this other end of said shaft to said work holding means.

4;. In a machine of the class described, the combination of a support, a grinding wheel, a work holding stock carried by said support, a rotary member journaled in said stock, a chuck on the forward end of said rotary member, a drive shaft extending downwardly through the standard of said stock, gearing connecting said rotary member and said drive shaft, a pivot around which said stock is adapted to swing, said pivot being located eccentrically of the axis of said drive shaft, said support having a slot therein for permitting the angular swinging movement of said drive shaft with said stock and separate means to close the exposed portions of said slot.

. 5. In a machine of the class described, the combination of grinding means, work hold ing means, a support having an opening therein, a slide movable relative to said support and adapted to cover and uncover portions of said opening, said slide carrying one of said means, an apron member movable to cover the portion of said opening uncovered by said slide, and a spring operative to move said apron member in one direction.

6. In a valve grinding machine, the combination of a support with a grinding member and a work holding member carried by said support, means for moving said members transversely, longitudinally and an gularly, relative to each other, an electric motor associated with one of said members and havingoperative mechanical connection to drive said latter member, and means for transmitting power to the other of said members from said motor, including a shaft, a. bearing for said shaft swivelled relative to said motor and relative to one of said members, means for driving said shaft from said motor, a second bearing for said shaft which is movable with the other of said members and an operative driving connection between said shaft and said other member.

7. In a valve grinding machine, the combination of a support with a grinding member and a work holding member carried by said support, means for moving said members transversely, longitudinally and angularly, relative to each other, said work holding member including a standard, a sleeve depending from said standard, driving connections forsaid work holding member including a shaft in said sleeve and having a bevel gear at its lower end, an electric motor associated with said grinding mem ber and having an operative mechanical connection to drive said latter member, and means for transmitting power to said work holding member from said motor, including a shaft, a bearing for said shaft swivelled relative to said motor, means for driving said shaftv from said motor, a second bearing for said shaft which is movable with said work holding member and slidably carried by said sleeve, a bevel gear carried by said latter shaft and meshing with said first mentioned bevel gearzand means for moving said second bearing on said sleeve toqunmesh said gears.

8. In a valve grinding machine, the combination of a support with a grinding member and a work holding member carried by said support, means for moving said members transversely, longitudinally and angularly, relative to each other, said work holding member including a standard, a sleeve depending from said standard, driving connections for said work holding member in cluding a shaft in said sleeve and having a bevel gear at its lower end, an electric motor associated with said grinding member and having an operative mechanical connection to drive said latter member, and means for transmitting power to said work holding member from said motor, including a shaft, a bearing for said shaft swivelled relative to said motor, means for driving said shaft from said motor, a second bearing for said shaft which is movable with said work holding member and slidably carried by said sleeve, a bevel gear carried by said latter shaft and meshing with said first mentioned bevel gear and means for moving said second bearing on said sleeve to unmesh said gears, comprising a handle, a shaft, a crank pin actuated thereby and connected to said second bearing to lift the same.

9. In a valve grinding machine, the com bination of a support with a grinding member and a work holding member carried by said support, means for moving said members transversely, longitudinally and angularly, relative to each other, an electric motor associated with one of said members arid having operative mechanical connection to drive said latter member, and means for transmitting power to the other of said members from said motor, including a shaft, a bearing for said shaft swivelled relative to said motor, a pulley on said shaft adjacent said swivelled bearing, driving means including a belt between said motor and pulley, means for maintaining said belt taut, a second bearing for said shaft which is movable with the other of said members and an operative driving connection between said shaft and the other of said members.

10. In a valve grinding machine, the combination of a support with a grinding member and a Work holding member carried by said support, means for moving said members transversely, longitudinally and angularly, relative to each other, an electric motor associated with one of said members and having operative mechanical connection to drive said latter member, and means for transmitting power to the other of said members from.said motor, including an extensible shaft, a bearing for said shaft swivelled relative to said motor, means for driving said shaft from said motor, a standard for said work holding member, a second shaft in said standard, said standard being pivoted eccentrically relative to said second shaft, a second bearing for said shaft carried by said standard and operative driving connections between said shafts and between said second shaft-and said work holding member.

In witness whereof, I hereunto subscribe my name this 31st day of May, 1924.

FRANS O. ALBERTSON.

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