US977324A - Grinding-machine. - Google Patents

Description

H. B. NICHOLS.

GRINDING MACHINF.

APPLICATION FILED AP;1',.5,1910.

Patented Nov. 29, 1910.

5 SHEETSSHEET 1.

n HEEM EEEEEEG O O i H. B. NICHOLS.

GRINDING MACHINE.

APPLICATION FILED APILfi, 1910.

977,324. I Patented Nov. 29,1910.

5 SHEETS-SHEET 2.

y 4600 @Qbfl H. B. NICHOLS.

GRINDING MACHINE.

APPLICATION FILED APR.5,1910.

977,324. Patented Nov. 29, 1910.

6 SHEETS-SHEET 3.

H. B. NICHOLS. GRINDING MACHINE.

APPLICATION FILED 11.5, 1910.

Patented Nov. 29, 1910.

5 SHEETS-SHEET 4 LVITNESSES H. B. NI GHOL S. GRINDING mcanm; APPLIOA'IIIOIR'I-IILEYD 12.5.1910.

Patented NOV. 29, 1910.

INVENTOR WWW Ag'lomey figure,but are similar to those in the pat- '807,193, 807,194, 856,721 and-913,543, grant- 1905, June 11, 1907, and February 23, 1909,

especially for an angular feed, so that other machine especially UNITED STATES PATENT OFFICE' HENRY B. NICHOLS, OF PHILADELPHIA, PENNSYLVANIA.

GRINDING-MACHINE.

, Specification in Letters Patent. P t t 29, 0, Application filed April 5, 1910.

Serial No. 553,524.

To cit w/wm it may concern.

Be it known that I, Hnxnr B. Nionois, citizen of the United States, residing at Philadelphia, in the 'ounty of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Grindirig-Machines, of which the following is a specification, reference being had therein to the accompanying drawing. a

My invention relates to grinding machines of the class described in Letters Patent Nos.

ed to me December 12, 1905, December 12,

and has for its object the provision of means whereby machines of this class may be adapted for grinding hollow forms.

Briefly stated, the characteristic features of my present invention are as follows: A supporting bed carries a. head stock and a tail stock, thehcad stock carrying the grinding shaft and constituting the tool support, while the tail stock carries an outboard bearing for the grinding shaft, and constitutes with its disk or crank shaft the means for definitely determining the figure of the cut. The work is carried on a support intermediate of these two elements, and being hollow the rinding shaft passes through it. Various adjustments. and feeds are provided}. and in. one form of machine I provide forms than cylindrical may be ground, such for example as conicalshapes or curves of variable radius.

My invention is illustrated in the accompanying. drawings in which Figure 1 is a side view of a portion of a adapted to grinding cylindrical forms, such a form being shown in the figure in sectioni Fig. 2 is a similar View of a modified machine for grinding large. cylinders. Figs. 3,4 and 5 are respectively apla'n, a side elevation, and an end elevation with spindle mechanism removed of a modified form ofmachine especially adapted for grinding conical forms.

Referring to Fig. 1, A is the head stock or tool support of a machine similar to those in my patents hcrcinbefore referred to. 1 This head stock is pivotally mounted upon a bed which also carries the tail stock mount ing B and the work holder or carriage C. The details of the mounting, as well as the bed of the machine, are not shown in this socket, in the cuts and also to those in Figs. 3, 4'. and 5 which will be more fully described hereinafter. The grinding wheel a, is shown mounted upon a hollow shaft a having end motion the yoke structure a being therein connected with feed mechanism fully described in my patents and especially in No. 913,543. In that patent, the tail stock carries adriven disk F, which as it rotates swings the tail of the shaft in a circle, gives the yoke mechanism compound motion in its universal bearings and rotates the spindle, while the tool is itself rotated thereon by means of separate drive connections in the yoke. Such a construction is satisfactory for some purposes, but for large forms and especially for long forms, springing and vibration of the spindle become factors, as they I tend to affect the cut andrender' it non-uniform. In the present case therefore, I change the swing stock to the opposite end of the bed plate or frame of the machine, and provide a supplementary spindle (4 preferably concentric with and passing axially through the driving spindle, and connect the end of this supplementary spindle through a universal joint or movable outboard bearing' Z) with the rotating disk I) on the stub driving shaft 6 in the tail stock. The universal joint 6 consists of a ball and present case the latter being secured on the disk I) with radial adjustment, as in my patent. Longitudinal feed is effected by the carriage C carrying the work, being moved by a feed screw as disclosed in the patent; and cross feed is effected by moving the grinding wheel (t on the spindle a 1n a-manner also described 11] the patent.

In the modification shown in Fig. 2, the tool: support A, the wheel a and the spindle a are the same as in Fig. 1, but instead of thesupplementary spindle (1 I provide an extended bracket B eccentrimlly mounted on the disk '1) on the tail stock B and rotating therewith. At the extremity of this bracket I provide pivoted bearing plates receiving the spindle a and constituting an outboard bearing for the same. This bearing in its entirety is marked 71 and may be constructed in any desired or suitable manner. In the form shown the upper plate I) is detachable by removal of the usual side bolts, to permit of the disengagement of the s indle and the removal or adjustment of t e work or of the parts of the machine. yltma'ybe stated as a guide to the understaniiing of the functions of these two cylinder grinders that the cylinder assumed for the machine in Fig. 1 is 36x36 inches internal measurement, while the cylinder assumed in Fig. 2 is 48x60 inches. The form of bearing shown in Fig. 2 I may call a V wheel and the spindle throng 6 by means of t and 5, in which'a complete mac ine 1s illus trated especially agalpted for coir'ical forms".

It will be underst by those skilled in the art after reading this description that curved forms of variable radius may also be ground in is machine by providing correspondingly variable feeds. The description will be limited to the conical arrangement however, for the sake of clearness and simplicity. v a a In the figures mentioned, the head stool:i

tail stock and carria e are marked A,"B an C respectively, as efore; all three being supported upon a flan ed bed plate D. The head stock a which as a pedestal with a long base, is fitted directly to one end of the.

bed; The tail stock B, is secured upon a supplemental column or pedestal with a broad base which is also fitted upon and directly secured to the bed at ts opposite end. .Between these two the carriage is adapted to be raised and lowered and reciprocated by means of feed screws. screws are shown at a, c and a in Fi 4. The carriage itself consists of two mem rs, that is the carriage proper, marked a", which has vertical end-flanges a engaging dovetail slides b and a on the tail stock and head stock respectivel and a super osed work support adapts to slide lon 1tudi nally on the'member c and provide with guiding flanges and a drop lug" engaging the feed screw 0. marked a", and is provided with t e usual transverse T-slots -to receive securingbolts of the work cradle E and the binding chain F. The work being conical, or of greater diameterat one end than the other, requires special supports in order to center itproperly as shown. The cradle and chain, together with a supplemental cradle E are employed for this purpose, and are composed of the following instrumentalities: The cradle E comprises a base plate a from which rise the slide supports or horns e I and 6 these being curved so as to form substantially an arc of a circle concentric with the main axis of the machine, that is to say the axis passing through and pentering both the chain F. is

bevel These This work su port 1s.

the tail stock spindle and the head stock universal joint.- Radial slides are provided in both. the horns, as best shown in Fig. 5, at e and e, to which are fitted slide blocks or ad'ustable jaws e and e, held in place by b0 ts e and 6?, working in slots in the jaws, and adjusted by means of follower icerews e and e. A thirdslide block may am these three blocks are set up ,to the conrovided if desired, as indicated at 6 tour of the work while leveling and before and horns similar-to those of the lar er cradle and may or may'not be fitted withslide hlocks aecordin' to the nature of the work andthe probab e amgnnt of variation in its radius. 1

.To hold the work down u n the cradles 4 rovided wit turn buckle f and astrain p atebolted to the support 0. The turn buc e in the present case is reduced to a simple hook plate with an L flange to take the nut on'the end ofthe strain bolt. The chain passes up over a saddle f flanged at a and with a hook f at the otherend tota e over the'upper edge of.

the work. I

The grinding is done bythe wheel a, rotated by means of the hollow shaft a which extends back through hearings in the yoke a and terminates at the traveler a, through one member of which the. feed screw a passes, which is manipulated through bevel gears by the hand wheel a". Thus the whee is fed in a line arallel to thesurface of the cone it is grin ing. The

wheel is rotated by a drive pulley throu h (gears and a spline connection, as escribe in my patents.

In order to steady the wheel, and also to rotate its spindle, so as to describe the circles of a cone, I provide in this case as in the cylinder grinder an outboard bearing in the s ape of a universal joint I) on the face plate or disk I) of the tail stock spindle. The difference is this, that whereas the feed in thecylinder grinder is attained through reciprocation of the carriage, in the cone grinder it is attained by reciprocating the wheel while maintaining the carriage and the work thereon stationary.

As plainly seen in Figs. 3 and 4,'tl1e ca'rriage feed screw 0 is turned through bevel gears by means of the hand wheel W for purpose of cross feed. The vertical adjustment of the carriage is effected by means of a crank C which through bevel gears at a and a at opposite ends of the spindle o is centering. The cradle E may have a base capable of turning the longitudinal shaft ed flan es 0, engaging the dovetail slides b and a It will be observed that by thus directly connecting the carriage (which supports the work) and the head and tail stocks (which determine the alinement of the tool) accurate adjustment is insured for all positions 0 the tool and carriage.

In my prior Patent No. 913,543, hereinbe-- the said patent may be applied to the. present machine and are contemplated herein. l" or example, it must: be evident that the inner surface of the conical form shown in Fig. i would notbe accurately ground if the wheel a were suffered to wear away without suitable compensation for the loss in diameter.

Such compensation may be produced by moving the carriage C through the medium of the hand wheel IV, but it may also be conveniently produced by automatic calipers in every respect similar to those in the prior patent.

I am aware that a number of variations and modifications maybe made in the de tails of'the machine I have described herein, among, which are to be noted the provi sion of automatic feeding means for the carriage to compensate for wear on the wheel, these being regulated if desired by automatic calipers as above mentioned, also the provision of either manual or automatic means forvarying the-swing of the spindle by varying the rotary distance of the ball and socket joint from the center of the base plate. on tbe'tail stock. This latter means would enable curved fornisother than cones, that is to say forms varying in diameter at, different points in their axes to be aceuratcly cutor ground. It goes without saying that any desired cutting tool may be substituted for the grinding wheel without departing from the scope of the invention. All such changes are contemplated by me,

which lie within the scope and purview of the append d claims.

Haring ti us described my invention, what.- I cl and desire iosei-ure by Letters Pat- E. In a grindingmachine, the con'ibination with a work support of a tool support, a tool spindle swiveled for universal movement therein, means for adjusting said .tool spindle relative to said work, means to rotate said spindle operative in all the augular positions thereof, and means on the same side of said tool support as said work support to impart to said spindle a motion which will giro the desired contour to the Work.

2. In a grinding machine, the combination with a work support of a tool support, a tool spindle swiveled for universal movement. therein, means'for adjusting said tool spindle relative .to said work, means to rotate said spindle operative in all the angular positions thereof, a driven member carrying" an outboard bearing for the tool adapted to impartthe desired contour to the work, and means to adjust said work support relatively to said tool support.

3. In a grinding machine, the combination with the frame thereof, of a work support carried by saidfranie, a tool support. also carried by said frame,a tool spindle mounted therein and means to rotate the same, means for adjusting said tool spindle relative to said work, and driving means, also carried by said frame, and connected to the outer end of the spindle to impart; to the latter a shaping motion whereby the desired contour of the work may be produced.

4. In a grindingmachine, the combination with the frame thereof, of a work support;

. mounted upon said frame. means foadjustimg the work support, a tool support also mounted upon the frame, and a grind ing tool ear'ried thereby so as toha-ve universal motion thereon, means for driving said tool so as to impart to it a cutting motion, means for adjusting said tool spindle relative to said work and a driven member carrying an outboard bearing forthe spindle to guide the tool to impart the desired contour to the work.

5. In a machine of the class described, the combination of a standard, a bearing swiveled thereon for universal movement a 1'0- tary tool spindle journaled in said bearing and carrying an abrading tool, a work support and means for adjusting it toward and away from said standard, a rotatable face plate located on the same side of said standard as said work support, and means carried by said spindle adapted to engage said face plate, whereby said spindle may be caused to carry said tool in a curved path around the work. 1

6. vIn a machine of the class described, the combination of a tool spindle, a tool carried thereon intermediate of its ends, means at one end to rotate the same and means at the other end to simultaneously give it a universal motion about an intermediate point of its axis.

7 In a machine of the class described, the combination of a tool spindle, means to give the same a universal mot-ion about an intermediate point of its axis, means located about said intermediate point to rotate said spindle, a cutting or abradi-ng tool carried between said intermediate point and one end of said spindle, and means connected with the same end thereof to swing it about said intermediate point, wherebysaid tool stock and means journaled. thereonadapte ing member univcrsallys'wi-veled on said support, a tail stockcarryingva rotatable face plate with its center'g-coincidingfwith the center of universal r movement -oi .said" tool carrying member, a socketfriiemberad i- -justably secured to said face pIa'teand'cOn nections between said socketmemberjand'tha end of said tool carryingmember whereby rotation of the face p member, and will revent' springing rying) or v1 ration of the same uring its trav'eL:

9. In a machine of the class described; a

tool support, a spindle journaled thereonsof as to have universal motion, means for rotat ing means for said I 1 L amachine of the class described, a d tool support and tool,- with means for driv-.

ing' said spindle, a tool -on' the ,spindl means for reciprocating the spindle, a tai to swing the spindle, and a carriage be tween the tool support and-tail stock, with means to secure the work thereon. i

10. In a machine ofthe class described,-

a tail support, a spindle journaled thereon to have universal motion, means for rotating the s indle, means for reci spind e, a cutting tool carried adapted to swing the spindle and too and guide the latter over the surface of thework.

11. In a machine of the class described,

a head stock'or tool support, a spindle-journaled thereon so as to have universal motion, means to rotate said spindle, means to reciprocate the spindle, a tool on the spindle at a point remote from its universal bearing, a work support, and rotary means connected to the end of the spindle adapted to, swing the same so as to describe the figure ofa cone having its apex at the center of uni versal motion, whereby. the combined rotation and reciprocation of the tool will en-. able cuts to be made in the figure of a cone. 12. In a machine of the class described, a tool and tool spindle, a work support, means to rotate the spindle and tool, means to reciprocate the tool, and means to swing the spindle and tool in circles of varying diameter, whereby round surfaces of correspondingly varying diameter may be accurately cut.

13. In a machine of the class described, a pedestals carrying supporting bed, a pair of a head stock and a tail stock respectively, dovetails formed on both edges of each of the opposed faces oi the pedestals, a horic1asaet5iba',thecombination of a tool supporha tool carryate will impart'aiuniversal swinging movement to, said mohairrocating the;

y the spindleat a point remote from its universalbear ing, means forsuppor'ting work in (Position;

zontal carriage havin transverse end'bracketswith overturned e dgcs forming dovetails tolenga' e andlcooperate with the dovetail feed screws with their lower ends set in footstef hearings on the bed and their upper enjsin sockets onthe lower side of the car- 'riage,'a worm wheel on each screw, a shaft carrying; worms engaging the said worm wheels, said shaft passing said pedestals, o eratin means for turning said shaft and ,t ereby imparting motion to port [score with transverse and fitted to the upper surface of'the carriage as to slide longitudinally thereon, a drop 11! on, the lower side of'said work support, a ongitudin'al feed screw journaled at and threaded throu h said lug, and operateed screw.

ing the same, and awork support with means for securing forms of varying'diame- .ter thereoncompri'sing-a cradle and binding meansfor holding the form therein.

' 15. In a machine of the class described, a tool support and tool, with means for driving the same'-,'-and a work support with means for;

thereoneom risi form thereon; 16. In amachine of the class descr bed, a tool support and tool, with means for drivmeans for securing forms of varying diameter thereon comprlsin a cradle with ad ustable supports, a sad upper portion of the form, and binding means passing over the saddle with ends secured to the work support. 4

17 a machine of the class described, a tool supportand tool, with means for dr ving the same, and a; work support w1th means for securing forms of varying diameter thereon comprlsing a cradle with adjustable slide supports, a saddle adapted to fit theupperpart' of the form, chain orband passing ov'erthe saddle a'n sechied by means of a strain plate or turn buckleto-the-work suppiort.

18. In a machine of t e class-descr1bed, a bed plate, a pair of pedestals spaced apart thereon, a tool support carrying a tool with driving means therefor, and a swing plate for the tool, slides formed on the opposed faces of the edestals, a carriage'fitted for vertical traye on said slides, a work sup ort consisting of a plate fitted for longitu inal travel on the carria e, a cradle having adjustable horns orsli e supports rising from oppositesides of the plate, a bmding member forms of varying diametera cradle with adjustable supports, an bin mg means for holding the I 1e adapted to fit theand a bindi'n .edgeso theslides, a pair of parallel vertical through one of thefeed screws.simultangouslyilalgrork spp- 0 mg s ots itsends-an-the end brackets of the carriage,

ing the 'same, and a work" support with adapted to'pass over the work when placed in the cradle, and a strain member securing the binding member to the plate. 19, In a machine of the class described, a 5 bed plate, a pair of. pedestals spaced apart thereon, a tool support carrying a tool with driving means therefor, and a swing plate for the tool, slides formed on the opposed faces of the pedestals, a carriage fitted for 10 vertical travel on said 5. ides, a Work support consisting of a plate fitted to horizontal slides on the carriage, a pair of cradles se- 1 cured transversely on said plate, and a binding niemberadapted to pass over the Work when placed in the cradles, With its ends secured to the opposite sides of the plate between the cradles.

In testimony whereof I afiix my signature I in presence of two witnesses.

I HENRY B. NICHOLS.

Witnesses:

EDWARD E. CLEMENT, 6110. B. TAYLOR.

Images