US1908946A - Valve grinder - Google Patents

Description

May 16, 1933. w BARBER 1,9085946 VALVE GRINDER Filed April" 27, 1928 l --l-TL-I INVENTOR Wmmh aws BY His ATTORNEYS lil .alf/x *l 1 l' Patented May 16, 1933 UNITED STATES WILLIAM BARBER, OF BROOKLYN, `NEW YORK VALVE GRINDER lApplication led April 27, 1928. Serial No. 273,319.

This invention relates to new and useful improvements in grinding machines and has for its object to provide a device of this character'particularly adapted for the grinding of valve seats for poppet valves or the like.

A further object is to provide a grinder having a multiple grooved chuck, producing extended rectilinear motion and returnby its revolutions.

Another object of this invention is the provision of a grinding machine adapted to grind poppet valves or the like wherein there are provided means to cause the valve being ground to rotate and reciprocate over the surface of a grinding element.

Another object of this invention is the provision of worm threaded means whereby a poppet valve or the like which is to be ground may be rotated and reoiprocated across the rotating surface of a grinding block. Y

Another object of this invention is the provision of a grinding machine having means for grinding a poppet valve which poppet valve is adapted by predetermined structural disposition to rotate and translate upon the surface of the grinding element.

Various other objects and advantages of the invention than those above mentioned will appear morefully hereinafter. It is to be understood, that the specific forms shown are merely illustrative and hence the detailed description thereof is not to be taken as limiting the invention itself. Y

The invention consists substantially in the tive arrangement of parts, all as will be more fully pointed out hereinafter.

In the accompanying drawing Figure l is a view in elevation Figure 2 is a plan view Figure 3 is a sectional view taken on line 3 3, Figure 2 Y i Figure 4 is a sectional viewtaken on line 1 -4, Figure 3 Y r Y Figure 5 is a plan view, partly in section,

' of themultiple grooved,ror, screw threaded holder.

lar parts throughout the various views of the drawing. v

Heretofore` various structures have been provided for the purposes of surfacing iconically shaped poppet valves and the like.

Most of these structures, a typical one being that 'disclosed in the patent to Tryon, No. 1,602,135 dated October 5, 1926, have disclosed a structure wherein a given valve which is to be ground is brought tobear 00 againstfan emery wheel, or other type of v` grinding wheel, and is 'continually held in one position on the surface of that wheel. There, of course, has been provided means lwhereby vthe valve to be ground is rotatable 35 wherein the valve surface which is to be y ground may be made to move over the grinding wheelsurface: 4(3) wherein there is provided means whereby the surfacef to be 30 ground on the valve may be varied due to `means permitting of the rotation of the valve itself.` It is obvious, of course, that in the, art of grinding valves, and especially those using the gas engines, that the ground sur bt t' 1 1 '1 fface Vhas heretofore been. formed conically. com mamon Cons me lon Ocatlon am le a In the device as'I recite 1t the operation, as

ithe valve is reciprocated and rotated with reference to the holderhereinafter disclosed,

results in that the angle in which the valve is continually presented to the grinding wheel Athrough the action of a spring, hereinafter disclosed, is constantly changing in each of its different positions of'its reciprocating motion with the resultthat a somewhat curved'surface is ground over'the portion of the valve and the usual beveled surfaceV` is dispensedv with to the end thatV a more perfectly ground valve is obtained. 4 The degree Y of curve given to the valve is, of course, afunc- 100 tion of the relation existing between the speed of rotation of the poppet valve and the speed of rotation of the grinding wheel. There is no particular reason why the favored conically shaped beveled surface around the periphery of the valve should be adhered to when a rounded surface maybe readily attained, which is more perfectly ground and, therefore, will give a better valve action. If, however, it be desired that a conical surface be yielded this can easily be attained by applying the machine herein disclosed to a pope pet valve originally of substantial conical form and arranging the speed of rotation of the valve so that it is of a predetermined small magnitude with respect to the speed of rotation of the grinding wheel. I, therefore, providea manner and means hereinafter to be disclosed ywhich will give me the desired result. i

Referring more particularly to the drawing in which like numerals refer to like parts throughout the specification. In the drawing above briey described, I provide a frame 10 carrying a grinding element 12 and the tool or valve holding device 13.- The grinding element may be of sandstone, emery carborundum, or, its equivalent, which is carried on a drive spindle 14. This spindle' is seated in a fine adjustment sleeve 15 in the frame 10. A pinion 16 on spindle 14 engages with drive gear 17 which is operated by handle 18. A clamp 19 provides means for fastening the device on work-bench or the like. The valve and tool holding device is adjustably carried on an adjusting table Y270 which is supported on frame 10 by arm 21. This arm is attached to the frame by a pivot joint 22,'and Vpermits axial adjustment Von the pivot bolt 23 to varying positions. VVA second pivot joint 24, at the end of the arm 21, carries the adjusting table 20. This vtable is provided with a slot 25 in whichbolt 26 of tool holding device, or sleeve, 13 is-.held slidably. This slot may be in alignment with the emery wheel. in which case the valve 27 is in position for being dressed onits edge 2,8` in the manner stated below.

Within the holding sleeve is rotatively mounted the chuck 29, whichis held in position by set screw 3()k engaging the worm groove 31 uwhich extends from its forward end 31 to substantially three-fourths its length.k The chuck is a straight walled tube construction in which fit, from either end, the holding sleeves 32 for receiving and holding the stem 33 ofthe valve 27. The sleeves are split as is best shown in Figure 4,-.and by this means and the very gradual taper as is bestV shown .in jFigure 3, the stem 33 is cen-v tered and rmly held for grinding as the chuck is rotated by means of-thehandle 34.

From .the disclosure-thus far given, the

. operation of my device wil'lbe readily understood. The tool or valve stem is secured by firmly held in frictional contact thereto. As

the grinding wheel is rotated, the valve or tool caused to be rotated also, on its axis,

by means of the4 handle 34, thereby properly dressing the valve, or tool, as the case may be.

' To the driving shaft 36, I have provided a squared shoulder to which may be secured power drive connections.

The construction herein disclosed not only provides a very economical device, but by its flexibility and independence of the operating parts, means are afforded whereby any part of the valve, or tool, may be given the proper dressing. Thev assembly of the valve stem and vsleeves is quickly made and, without assembling tools.

The simplicity of construction importance and e-fliciency of theoperation of thechuck makes it one of the chi-ef points of consideration in the'invention. Its value will readily be appreciated when it is remembered that to produce a smooth, even finish on the tool, or instrument being polished, it is highly necessary that the contact surface of the grinding element be kept in a smooth even condition, and this can be done, only, by keeping the instrument being ground constantly moving back-and-forth across the grinding face of grinding element. This I accomplish by means ofthe worm groove, in

the periphery ofV the chuck, engaging set screw 1n holding device and rotating, rightV and left by handle for said purpose.

As heretofore brought out the effect of the reciprocating motion combined with the motion. Incidentally thereV results a ground surface which is somewhat curved over the ground portion of the valve' with a curvature the degree of which depends upon the relativeY speeds of rotation'ofvalve and grindin wheel. It is,therefore, apparent vthat the valve as ground hasnot the usual beveled surface, but I' consider this-tobe of butsmall import when the high and fine degree of grinding that is thereby obtained is Aconsidered. It will be observed, therefore, that I have provided a novel means of grinding a valve and a novel construction therefor in con-junctionvwith a novel method'of correlating and allocating my various parts. Inasmuch as many changes may be made inthe above construction and many apparentlyV widely and different embodiments of the scope of the invention may be made without departing from the spirit and scope thereof it is intended that all matter hereinabove contained or shown in the accompanying drawing shall be interpreted as illustrative and not in any way limiting. The following claims are intended to cover all generic and specific features of the invention described.

Having thus described my invention, what I claim as new and useful, of my own invention and desire to be secured by Letters Patent, is-

1. In a valve dressing mechanism a holding member comprising a tubing having a projection for pivotally and sldably mounting said tubing and a table having an elongated slot in which said projection is mounted, a threaded sleeve rotatably held within said tubing, a set screw secured to said tubing and adapted to work in said threaded sleeve, tapered expansion members itting in said sleeve from opposite sides for engaging the stem of a valve or tube4 and a handle on said sleeve for rotating the same.

2. In a valve dressing mechanism a holding member comprising a tubing, a threaded sleeve rotatably held within said tubing, means mounted on said tubing adapted to work in the thread on said sleeve, a grinding element, tapered expansion members fitting in the sleeve from opposite sides for engaging the stem of a valve or tube, means on said sleeve for rotating the same, and means for rotating the grinding element.

In testimony whereof I have signed my name to this specification:-

WILLIAM BARBER.

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