US1664983A - Automatic coolant-arresting mechanism - Google Patents

Description

G. c. KIMMEL AUTOMATIC COOLANT ARRESTING MEGHANISM Original Filed May 6v, 1921- 5 Sheets-Sheet l @51j l Clt/hazmat m p G. C. KIMMEL AUTOMATIC COOLANT ARRESTIG MECHANISM original Fuga-May 6. l1921 5 Sheets-Sheet 2 l l J J vwemtoz @w @um "Q GMM ApH[3,-1`928. 1,664,983A 6. c'. KIMMEL. AUTOMATIC CQOLANT ARRESTING MCHANISM voriginal Filled May 6, 1921 s sheets-snee@ 3 Y infestedA Apr. 3, 192s.

` UNiT'ED- STATES PAT-ENT' oFFiCE- GEORGE c.` xI'ImEL, or WORCESTER, nassAciIUsETTs, AssIGNomBY uEsNE AssIoN- MENTS, To CINCINNATI GnINnEns INCORPORATED; or CINCINNATI, oIIIo, A Con- PoEATIoN 0E oHIo. f

original ap'piication mea nay s;1o21,seriai No. 467,297. Divided and this application mea Noveniber 2o,-

AUTo'xATIc cooLANT- ABEESTING MECHANISM.

i923. 'serial No. 675,910.

This invention relates to machine tools and more particularly'to the means for com' trolling the flow of the coolant in grinding machines .such as is disclosedin my Patent No. 1,522,465 granted on co-pending applica tion Serial Number 467,297, filed May 6, v 1921,- of which this application is a division.

In machines of this character, grinding is generally effected by means of a grinder car- ,ried on a rapidly revolving spindle mountedin a tool-.head and the `work and spindle are translated relatively to one another in order 1 to ellect the grinding operation, while at the same time the work in the head-stock may it is the grinder which be revolved, and vin some machines as in the embodiment of my invention to be described pai-takes of the translating motion.

To'A prevent undue heating of the work it is essential that a suitable coolant be con` stantly applied to ythe tool and work durin the grinding operation.

n machines of this character wherein th article; worked upon is frequently changed,

andcspecially inprecision work where it is necessary to frequently calibrate the article' operated upon, it is necessary to safeguard .the operative against injury from contact with the'rapidly revolving -grinder and other moving parts of the machine. :It is 'also highly desirable that the flow of coolant be arrested during the Calibrating operation and change-of Work, as a continued flow thereof hinders the action ofthe operaton This invention therefore has for an object to provide,- in a machinevof this character,

that is one in which both the work and 'tool Fig. 3 is a plan of of reference denote correspondcoolant, the pump,

parts being Aticularly to the` means for rotating. and

vherein are the same as those denoting likev parts in the parent application Serial No.

Atranslating the tool relatively to the work and the means for controlling the flow of the coolant, only such lparts are described in detail as are deemed necessary for"1 an under-v standingof the invention.4 For the sake of convenience the reference characters used 467,297, Patent N o. 1,522,465 to which reference may be hadNfor a completel understanding of-the machine in which the presare rotated and the tool is translated during the grinding operation and is adapted to be moved to an abnormal position, lautomatically acting means. actuated by tlie abnormal l simultaneously therewith shut oi the ilow ofthe coolant.A

Other objects and advantages will be in part indicated in the following Vdescijiptif'm and in part rendered apparent therefrom in Connection with the annexed drawings.

To enable others skilled in the art so fully to .apprehend the'undglying features here-- of thatth'ey may'em y the. same in the various' ways contemplated by this .invention, drawingr'sdepictinga preferred typical ent invention has been embodied.

Referring more particularly tothe drawings the invention is disclosed as embodied ina grinding machine comprising a base 01' housing 1- enclosingand supporting operating devices for la' grinding mechansim mounted on tlieupper 'face of tliehousingn The grinding vmechanism proper comprises 1 a tool-head 5 vand a head-stock 6. The headstock ismounted on a carriage 7 slidable upon transverse ways 8 and 9 on one end of the housing, and the head-stock may be translated either by means of a hand-wheel 10 having a shaft 11A providedwith a suitable. feed screw or by the conventional pawl and vratchet feed operated by a rod 12 connected with a reversing mechansini 13 for thev tool carriage. The head stock is carried on a rotatable plate 14 adapted to Vbe adjusted by means of a hand-wheel 15 to align the head-'stock spindle 16 parallel withthe longitudinal axis of the-machine for straight grinding; or at an angle thereto for` taper grinding. Within a housing in the 'headstock enclosed by a cover 1'( is a pulleyv 18 head,`serves to restore the tool-head to ,itsv

that extends downwardly ing and engages a drum 95 mounted uponva jack for the spindle 16 having a drive belt 19 entrained thereon.

A tool carriage 20 slides upon suitable ways (not shown) parallel to the longitudinal axis of the machine and rotatably mounted thereon is the tool-stock 5. Secured to the tail end of the tool-head as by means of bolts 38 is a projecting arm 41 carrying at its eXtreme end an anti-friction roller 42 cooperating with a cam plate 43 carried on a cam block 44 slidably secured in a guideway 45 in the housing by means of a bolt `46 in order to adjust the rearward limit of movement of the tool-head.

It will now be understood that as the tool carriage is retracted a suflicient distance 48 rigidly secured to the housing and having a connecting cable 49 secured to the toolnormal operating position, a pulley 50 on the housing and another pulley 51 on the carriage being provided to properly guide the cable. The return limit of swinging movement of the toolstock is determined by a pin 52 mounted on the tool head engaging a second pin 53, which may be adjustable if desired, mounted in van abutment 54 fixed to the tool carriage.

lVithin the tool-head is journaled a suitable spindle upon the `opposite ends of which are secured the grinding wheel 55, and the pulley 74 (shown in dotted lines only, Fig. 2) over which latter is trained a belt 88 within the housshaft 96 journaled in the housing. Thedrum 95 is ratherlong, and may b e made, in sections if so desired, to permit the belt 88 to travel therealong. and bev driven thereby as the tool carriage 1s moved back and forth.

Intermediate the pulley 74 and the drum 95 is a stationarv idler 90 and a iioatin'g idler 91 about which .the belt 88 is trained.` These idlers act' to maintain the proper tension on the belt and'permit it to lengthen out as the toolhead is swung through the arc of a'circle 'in a retractilemovement i thereof and to' permit the belt to accommodate itself to different belt center distances when using-different sizes of wheel spindle pulleys. The shaft 96 is driven, through suitable connections A(not shown), from a power driven shaft 108 journal d in suitable bearings at the rear ofthe housing.

The tool carriage maybe shifted back and forth by means of a hand-Wheel 117 which has a shaft provided with a 4pinion engagmg a suitable rack on the tool carriage as is fully disclosed in Patent 1,337,139 granted to me April 13, 1920. Means are provided for automatically moving the carriage back and forth which means may be thrown in and out by the clutch lever 119, the reversing of the carriage being accomplished by means of two dogs 120 and 121 adjustably `mounted on the tool carriage engaging a reversing lever 122. It should be un stood that in ordinary operation ofthe tool carriage it does not' move back sufficiently to cause a turning movement of the toolhead. lVhen however it is desired to inspect or remove the work, the reversing lever is pulled out of the path of movement of the dog 120 and the driving mechanism will then move the tool carriage suiiiciently to cause the tool head to be swung on its carriage, the automatic drive for the carria e including a frictional means adapted to slip when the tool head has been swung to its complete limit of movement against the cam block. It is also to beunderstood that the clutch lever may be" so set as to disengage the automatic carriage shifting mechanism, and the hand-wheel 117 'may be operated so as to fully retractthe carriage. As4 the tool carriage driving and reversing Imechanism forms no part of my present invention, a

detailed description thereof is not given a clutch operating lever 127 rigidly secured to a shaft 128, the opposite end of the lever 127 engaging a collar 129 mounted on a shaft 130 slidable in a sleeve 131- to which are rigidly secured change speed gears 132, the sleeve beingrv supported in bracket bearings 133. Rotating freely on the sleeve 131 is a pulley 134 having a clutch drum 135 adapted to be clutched in sleeve driven engagement thru the instrumentality of a pin 136 .operpatin@ a clutch ring and operable by sliding movement of the shaft 130. In Fig. 2 for the sake of clcarness I have shown the clutch drum in released position while the tool carriage is just about to shift the shaft 130 for effecting this release; the drag link 126, heiner shown as parted. Over the pulley 134 is trained the belt 19 which like the belt l88 is trained over a stationary idler 137 and 138, in order to permit a floating idler lengthening of the belt as the head stock carriage is moved back and forth lon the wavs 8 vand 9. Itl can now be seen that coordinate with the full rearward movement of the tool carriage the dog 123 actuates the drag link lever to so move the shaft 130 as to release the pulley 134 from driving engagement with th gears 132. Upon a forwardmovement o the tool carriage the dog V123 -engagesthe other arm of the forked lever 124 and startsv the rotation of the -head stock. i

Means are provided to furnish a coolant to the work, this means comprising a. pump 145 mounted on the cover late 146 of a tank 147 into which there proJects .a sump pipe 148 to conduct the coolant to the pump. 'llie pump is driven from the main drive shaft 108 by means of a belt 149 trained overa pulley on the shaft 108 and over a pulley 150A on the pump shaft. The outlet pipe 151 -of y. the pump is provided With an oscillatory valve 152.connected by means of a link 153 with the lever 127, and into the opposite side of the valve is threaded a pipe 154 to which may be attached xa rubber hose 155 leading thru a regulating cock 156 to the hollow spindle within the chuck as will be readily understood by referring to my Patent 1,337,140 granted to me April 13, 1920. VYith this construction, coordinately with the turningmovement of the tool head and the shutting olf of the power from the head stock, the valve 152 is shut off to thereby automatically cause the coolant to cease flowing. -The tank is mounted on rollers 1,57 so as to enable ready removal of thesame from the machine and the tank is provided'I with a central boss 158 provided with a vhole to embrace a locating stop 159 'screwed into the housing in order to properly position the tank with A reference to the housing. The forward-end of the tool carriage is provided with a marginal wall 160 terminating in a drain spout .161, and the upper suface slopes towardl said drain spout to drain the coolant flowing thereoninto a compartment within the housing from which an overflow pipe 163 empties into the settling .compartment A164 of the tank 147 The inclined guards 33 and 34 on the ways also assistin draining .the coolant back to the tank.'

From the foregoing it willbe observed that both the work and the tool are rotated and that during the grinding operation the tool' is automatically given reciprocatory movements of predetermined extent. lThe tool is also adapted at certain -times to be moved to an abnormal position.,A This movement to abnormal position automaticallyV 'and simultaneously swings the toil carriage out of its operative position,.causes the tool' to cease rot-ating .and arrests the iiow of coolant.- Likewise when the tool is again moved into operative' position to 'start a new grinding operation the' valve 152 is opened d and the iiow of the coolant is restarted..

Without further" analysis, thef foregoing will so fully reveal the gist of this invention that others can, by applying current knowledge, readily adapt it for various utilizations by retaining one or more of the features that, from the standpointlof the prior art, fairly constitute essential characteristics of either the generic or` specific aspects-of this' invention and, therefore, such adaptations should be, andare intended to be, coming, a tool head carrying a tool mounted on a carriage movable to and from said head stock, automatic means for moving said tool"V head toward and from said head-stock, `means for rotating the work; means including a` pipe for furnishing a cooling medium to the work, a valve in said'pipe, and means rendered effective by abnormal movement of said tool head simultaneously to render said work rotating means ineifective and actuate the valve to cut off the flow of coolant to the work. L y v 2. In a machine of the class described, a housing, a head stock having a rotatable shaft mounted on said housing, a tool head mounted on a carriagel movable to and from said head stock, automatic means for giving said tool-head a movement of predeter` mined extent toward and from said headporting mechanism mounted on said housstock, means permitting-said tool head to Y. i

be given an abnormal movement away from said headstock, means including a pipe and a valve in the pipe' for furnishing a coolant to the'work in the head stock@ and means operative by abnormal retractile movement of the tool head to eifect a stoppage of rotation of the shaft in the head stock and to actuate the valve to shut off the o'w of coolant.

3. A rinding-machine combining a housing; a ead-stock supported upon said hous-i ing; a tool-head translatably mounted on said housing; a coolant tank independent of said housing; means to locate and mainltain said tank in a predetermined position adjacent said housing; a pump carried by l said tank; piping extending from said tank to the pump and thence to' a lpoint adjacent the head-stock to deliver coolant to the work carried thereby; means to actuate said pump,

a vcut-off valve in said piping; means to give to said tool-head reciprocations of a predetermined length during a grinding operation; a lost-motion connection 'between-said tool-head and said valve whereby the valve u is maintained open during normal reciprocation of said tool-head; and means permitting' said tool-head to be' given an abnormal movement to remove the tool to an inoperativeposition and to cause said lost-motion connection to close said valve.

4;. In a grinding machine, in combination, anhousing; a head-stock supported thereby; ai work-.holder rotatably supported by the head-stock; a tool-head slidably mounted on said housing; a power shaft; a driving connection between the power shaft `and the work-holder, said driving connection including va clutch and a clutch-actuating lever; a coolant reservoir; a coolant transmission extending from said reservoir to said headstock; an oscillating cutoff valve in said transmission; an operative connection between said valverand said clutch actuating lever; means to give to said tool-head recip- A rocations oi' a predetermined length on said housing during a grinding operation; means to give to said Atool-head an abnormal movement; and a connection between said toolhead and sai-d .clutch-actuating lever rendered effective by the abnormal movement of the tool-head to release said clutch and to close said valve, thereby to stop rotation of latably mounted on said housinff means to l l o n n" give said tool-head reclprocations of a predetermined length during a grinding opera tion; means permitting said tool-head to be given an abnormal movementaway from said work-head at the end of agrinding operation; a coolant transmission adapted to supply coolant to the work, said transmission including a cut-off valve; valve-controlling mechanism including a lever pivoted to said housing adjacent said translatable toolhead; and a lever-actuating dog carried by said tool-head and maintained in a position wherein it contacts with said lever only when said tool head is given its abnormal movement to discontinue the flow of coolant to the work.

' In witness whereof, I hereunto subscribe my name.

GEORGE o. KIMMEL.

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