US1430285A - Oscar e - Google Patents

Description

0. E. BROWN.

VALVE GRINDER.

APPLICATION FILED DEc.24, I9I9.

1,430,285, l I Y ratenteasept. 26,1922.

E I I 2 5I l Y, /Z///// .II

nwntoz Oscafz'aanz Patented Sept. Z6, 192.2.

UNlTElS OSCAR E. BROWTT, OLP LANCASTER, PENNSYLVANIA.

VALVE GRNDEB.

Application led December 24, 1919. Serial No. 347,124.

To aZZ whom t may concern:

Be it known that l, Osonn E. BROWN, a citizen of the United States, residing at Lancaster, in the county of Lancaster, State of Pennsylvania, have invented certain new and useful improvements in Valve Grinders; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to tools for grind-v ing metal, and more particularly to those adapted for grinding curved surfaces; and the object of the same is te produce a grinder for the valves and seats of automobile engines, having special means for adapting it for use on various makes and types of engines.

The primary feature of the invention is the means which imparts to the valve an oscillatory motion through successively varying arcs, combined with a reciprocating movement of the valve so that it does not at all times rest upon its seat. A feature of the invention lies also in means for adjusting the movements of the tool to adapt it to different conditions.

v Another feature of the invention is a support with means for adapting it to di'erent makes of engines.

Details are set forth below and are shown in the drawings wherein:

Figure 1 is a vertical section through this tool complete.

Figure 2 is anvelevation of this tool withA the face plate and driving mechanism re-.

moved, certain parts being in section. j

Figure 3 is an inside elevation of the driving gear and cam.`

The body 1 of this tool is upright and hollow, one side being ring shaped and open as seen in Figure 2, and closed by a face plate 2 held in place by fastening means which may be removed to gain access to the interior mechanism. A t the upper end of the body is a handle 3. To the lower end of the body is connected a support 4c preferably having a plurality of legs 5 at its lower end spaced to permit inspection of the work being done, and a pair of arms '6 at its upper end which pass astride the body and are slotted as at 7 to be engaged by set screws 8 so that the support may be'adjusted vertically for different types of engines. For some engines wherein the valves are large the legs can be spread and for this purpose the outfit will be provided with several extensions 5 capable of being interchangeably attached to the legs in any suitable way, as by slots and setscrews 9 or otherwise. The purpose of this support is to maintain the tool in upright position and in strict axial alinement with the valve and its seat at all times, the operator being required only to grasp the handle 3 in one hand and bear downward.

Mounted for rotation and reciprocation within the body is the main shaft whose upper portion 10 rises into the handle and is borne normally downward by means of an expansive spring l1 therein, while its lower portion is tubular as indicated at 12 to receive an extension shaft or spindle 13, the same being adjustable by means of a set screw 14. ln other words, the main shaft is in two parts telescopically connected so that it can be lengthened or shortened, and the lower part or spindle 13 carries any one of a number of bits 15 which are adapted to the valves of various types of engines. For this purpose the lower end of the spindle is slotted and the bit passed upward into the slot and held there by a screw 16. It will be understood without further illustration that the bit engages the nick or nicks in the top of the valve while the latter rests on its seat, and in the act of grinding, an abrasive composition is placed between the seat and valve so that when the latter is depressed against its spring and turned, the faces are ground. It is clear that if the oscillation of the valve is through a single are, the grinding composition may, cut grooves in said faces which would destroy the efliciency of the valve, and therefore means are present for varying the arcs of oscillation and for raising and lowering the valve between strokes as will be explained.

lournaled through the center of the face plate 2 is a power shaft 20 squared at its outer end to engage a slot 21 within a crank handle 22 which has a hand piece 23, and a screw 24 passes through the slot and into the end of the shaft whereby the crank may be adjusted with respect to its operative length to suit the wishes of the user. Fast on the shaft 20 next inside the face plate is a power gear 25 whose teeth are mutilated through more than half the distance around its periphery as indicated at 26; and fast on the shaft 20 next inside this gear is a cam 27, the cam standing alongthe teethv at the upper side of the power gear, and splined on the shaft at some dis tance below the. collar` is another driven gear 37 adapted to be engaged by lthe teeth at the lower side of the power gear. rlhe hubs of these gears attheir outer ends may rest., against shoulders 30 which are cast as parts of the body, while their` inner ends may be held by forks 31 on a bracket secured within the body and having theirl arms passing ast-.ride the sliaft-therefore the gears may not move longitudinally during the reciprocations vof the shaft under the impulses ofthe cam, but the shaft will splined upon it, and the gears will of course be successively rotated as their teeth .engage thoseupon the power gear 25. Each gear is preferably splined to the shaft by means of'a set screw 32 passing through its hub and engaging a longitudinal groove 33 cut in the shaft, and by preference l provide several such .grooves 3d of different length with which the set screw of the lower gear V7 maybe engaged at will.

In operation, the arms of the support are adjusted alongside the lower end of the body andy thel main shaft isadjusted .in length to adapt the tool to the engine on which it is to work. The valve cap is removed, and a proper bit l5 applied and engaged with the nick of the valve, the support being stood upon thehead of the cylinder and held upright by the operator who grasps the handle 3 with his left hand. Now he grasps the crank handle 23 with his right hand and imparts rotary motion to the power shaft 20, .and at eachrevolution thereof the teeth of the power gear engage first one driven gear and then the other., Because said power teeth extend less than half Wayv around the power gear, the oscillation given to the main shaft will. be through arcs varying in length, as will be clearly understood,l that gear which is opposite the mutilation 26 turning backward during the impulse being imparted to the other lgear by the power teeth. Meanwhile also the cam 27 intermittently raises the lower shaft by its engagement beneath the collar39. This permits the valvey to'rise olf` its 'seat` for an interval, although the oscillatery` motion described is not interrupted;

and therefore the combination of the oscillatory and -reclprocatory movements will produce a variety of arcs through which imperative and as such support I prefer to employthat herein shownk and described.`

However, if the cani be removed from the power shaft, the reciprocations of the main shaft cease while its oscillations through various arcs continue.

Obviously the extent of the rearwardor upward movement of the shaft which car ries the valve holder is due to the angular movement described by the cam while inv contactjwith the shoulder formed on thesaid shaft by the sleeve or collar 38, and

that by limiting the movement of the shaft.

in a forward or downward direction,

y through the agency of the cooperating set, be rotated by the Oears because they are screw. 32, and grooves 84:, the terminal posi* tion of the shoulder with relation to the axis of the cam may be varied to provide for a greater or lesser throw, as may be required in the partic-ularvworl to be per-A formed. llt will yfurther be obvious that in rushing such adjustments the engagement of the set screw 32, with different grooves Sli, or grooves having different lengths, or permitting different throws of the shaft, a correspending adjustment of the .foot piece or support 4L, must be effected through the agency of the slots 7, and engaging set screws 8, or by means of the feet 5, which are employed as above described-in connection with thelegs of the support or footl piece to adapt the apparatus to `cylinders having different diameters or valve ports. U

What is claimed as new is:

l. In a valve grinder, thecombination with a hollow body, a driven gear rotatably mounted therein, and means for oscillating it irregularly; of a shaft -mounted for rotation and reciprocation in said body and extending through the gear, the shaft hav-` ing a plurality of grooves ofvarious lengths,

means in the gear for engagementwith the grooves selectively to limit the descentV of the shaft, a spring bearing the' shaft, norumally downward, and valve-holding means.

at its lower end.

2. A valve grinder comprising a frame, a.

shaft mounted for oscillationI and reciproca.

tion in the frame and having means forrconvnection with a valve 4to be ground, means for. oscillating the shaft, means for reeiprol. catmg the shaft and means for varying, the v extent of the reciprocation of the shaft.,

3. A valve grinder comprising a casing, `a

shaft mounted kin the casing for. oscillation and reciprocation and having means for conneet-ion with a valve to be ground, means for oscillating the shaft, means for reciprocating the shaft between the reverse movements of its oscillations and means for varying the extent of the reciprocation of the shaft.

4. In a valve grinder, the combination with a body having a hollow intermediate portion with shoulders at the upper and lower ends thereof, a shaft mounted for oscillation and reciprocation in thebody and extending across its hollow portion, valvecarrying means at the lower end of the shaft, yielding means at its upper end bearing it normally downward, and a driving shaft journaled in one side of the body, of a mutilated driving gear on the driving shaft, driven gears splined on the main shaft in contact with said shoulders and successively engaged by the teeth of said mutilated gear, a bracket within said hollow portion having forks engaging the inner ends of the driven gears, and connections between the shafts for raising the main shaft at intervals.

5. A valve grinder having a stand and a shaft mounted for rotary and reciprocatory movement and carrying valve holding means,

a driven gear through which said shaft eX? tends and to which it is keyed by means determining a variable limit of movement t0- ward the valve seat, the shaft being yieldingly impelled toward the seat, and gear actuating means having a shaft lifting cam for engagement with a shoulder on the shaft.

6. A valve grinder having a casing extended :radially to form diametrically registering tubular guides, a shaft mounted in said guides and extending beyond one of them to carry the valve holder, a grip seated in the other guide, a rest exteriorly fitted upon the first named guide for bearing contact with a cylinder head, and means housed in the casing for actuating the shaft.

7. A valve grinder having a casing extended radially to form diametrically registering tubular guides, a shaft mounted in said guides and extending beyond one of them to carry the valve holder, a grip seated in the other guide, a rest exteriorly fitted upon the first named guide for bearing contact with a cylinder head, means housed in the casing for actuating the'shaft, and the gripbeing axially bored in alignment with the shaft, and a shaft impelling spring being arranged in said bore in permanent contact with the shaft.

8. A valve grinder having a casing ex tended radially to form diametrically registering tubular guides, a shaft mounted in said guides and extending beyond one of them to carry the valve holder, a grip seated in the other guide, a rest exteriorly fitted upon the rst named guide for bearing contact with a cylinder head, means housed in the casing for actuating the shaft, and a support or foot piece being axially adjustable upon the guide upon which it is fitted and having slots engaged by set screws to secure the same in adjusted relation with the path of movement of the shaft.

In testimony whereof, I aix my signature, in the presence of two witnesses.

OSCAR E. BROWN. -Witnesses:

M. H. KULP,

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