US2424109A

US2424109A - Crankshaft grinding machine

Info

Publication number: US2424109A
Application number: US694883A
Authority: US
Inventors: Jules Miesse
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-09-29
Filing date: 1946-09-05
Publication date: 1947-07-15
Anticipated expiration: 1964-07-15
Also published as: GB622833A; BE466400A; BE460394A; DE807068C

Description

July 15, 1947. J. MlEssE y CRANKSHAFT GRINIDING MACHINE l Filed Sept. 5, 1946 3 Sheets-Sheet 5 Sheets-Sheet 2 J. MIESSE CRANKSHAFT GRINDING MACHINE July 15, 1947.

' Filed Sept. 5, 1946 a ,NN

July 15, -1947. J. MlEssE CRANKSHAFT GRINDING MACHINE 3 *Sheets-Sheet 5 Filed sept'. 5, 1946 v Il I I l l l l l I i l Patented July`15,`1947 UNITED STATES PATENT OFF-.ICE

- Application September 5, 1946;Seria1ANo. 694,883 In Belgium' September` 29, 1945 This invention relates to crankshaft grinding or truing machines andihas for'its particular objectto design a machine of this 'type' that would be of compact and inexpensive construction and Such as would "enable grinding operations to be effected in a Ashorter time.

According -to the invention, V,the crankshaft grinding' machine is' so designed as to enable' Athe crankshaft to be ground in a vertical position and comprises a standard'having slidably mounted thereon a carriage balanced by a counterweight the said carriage carrying a transverse shaft having slidably mounted thereon and suspended for oscillatory movement lthereon the' grinding wheel carrier mechanism; a resilient locking device being provided for keeping the'said grinding wheel carrier mechanism in its 'operative' position and for enabling disengagement and 'reeengagement thereof from and Yinto said' position vwithout disturbing the micrometer feed adjustment of the grinding wheel carrier mechanism. i

According to a further feature of the invention, the vertical movement Yof` the 'carriagev may be effected through an optional vgeared down mechanism and a quick action' mechanism. v

One way of carrying the invention into effect will be hereinafter described with reference to the accompanying drawin'gsin which:

Fig. 1 is a 'frontelevati'on of the 'crankshaft' grinding machine; p A

Fig. 2is a sectional'view alongthe broken line II-II'of'Fig". 1'; l

Fig. 3 is a front View, drawnto a-larger'scale of the carriage forming apart 'of the machine and having mounted thereon 'the lgrindingmechani'sm;

Fig. 4 is afragmentarysectional view taken at an angle of 45? with respectto Fig. 3;

5 is adet'ail' view showing' some of the constitutive parts of the grinding mechanism.

Fig. 6 is aside 'view' of"Fig. 3; and,

Fig. '7 is aplan view of vFig'. 3.

' In the drawings', the'table I of a base 2 (Figs. 1 and 2)' has pivoted thereto a horizontal circular plate 3 formed 'with a 'peripherical' .groove 4` for engagement of a V-belt 5`d1'iven' 4fromlthe iiywheel 6 of a motor 1. VTh'elatter is pivotally supported on a pin 8, the said motor being 'adapted to be locked on the said pin, in 'various angular positions by lmeans of a'bolt 9, thus providing for the adjustment of the tension of the belt'5.

The table I has formedtherewith 'or otherwise secured thereto a 'standard 'IIJ comprising. a" slide l I having'slidablymounted'thereon a carriage I 2 balancedb'y acouterweight I'3 through the me-y 2 diu'm of a chain I4 adapted to run over pulleys 15. A second plate I6 guided in a' diametrically ex-` tending groove I1 ofthe 'plate`3 is atilaptedA to be locked in an eccentric position with respect to the plate 3. Thej'plate I6 supports a rotarychu'ck plate i6' provided with locking means and adapted. to receive `the fiange. of a crankshaft' IBQtQ bei ground', y the latter being secured vto the rotary chuck'plate I6" by bolts passing through holes IAQ in the latter plate. "The arrangement 'is such that when the. crankshaft has been centred 'on the .rotarychuck-plate IGj-the latter isin turn being'ilckd ,to the plate 16. K V'Slidably mounted `on'. th'esli'dev Il. (is ahead stock k20' adapted 'to b .locked a suitable position on vthe standar-d10 and carrying acenti' 2| adapted. to engage the axial. bore Vof -the `crankshaft whereby to holdthe latter in position.

In a socketi22 Aarranged laterally o f the base k2 there is secured avertical-column 1,23 havinglits upper end! supported by anY armzlextcndin'g from thet'op endportion 'of the standard '|0. (The column 23k has slidably mounted thereon. a sleeve 25 provided with a locking handle" 26,.the said sleeve carrying a fork' ZIadapted to-sustain'the work 'to be ground.

Slidable with. easy". friction onatransversely positioned tub'28.f(1igs. 1, 3, l4), vhiclihast's ends secured to thecarriage '.'|.2, thereis arranged aislee've 29'rigid with a bracket 30, thelatter. having secured thereto the motor 3| adapted,

through the medium of pulley '32 and be1t.'33,fto drive a 'shaft' the outer end ofwhichcarries the grinding 'wheel '34, the rsaid shaft being rotatably mounted in a bearing 3 5 rigid with thebracketflt The grinding mechanism 2.9;13!) 3l constructed asshown. formsl a'pendulous assembly adaptedto oscillate around the tube 28. y

When Vgrindingis being effected, the grinding wheelA 34,` while being caused to .rotate `at high speedA underthe drive .of the vmotor -3 l may perform in addition an angulardisplacement `around the axis of the tube '28, which;isobtained v`bythe operator actuating. a'handlef. .Owinggto such angular'displacement'the .grinding Wheelmay be completely' disengaged' from' the portion of 1 the work which-r` is underfgrinding and, moreovergfthe grindingvoperation may befstarted by progressiveliT yengaging'the periphery of the grinding wheel with a resulting highly smooth working contact.

The Amotor 3`I is connected through a flexible cable 31 to a switchboard (not shown) secured totheinachine; the said switchboard controlling 3 in addition the motor I adapted to impart rotary movement to the plate 3.

The feeding mechanism whereby the position of the grinding wheel is adjusted with respect to the axis of the stock to be ground comprises a shaft 54 slidably mounted in the bracket 3Q and adapted to cooperate with an abutment plate 55 rigid with the carriage I2, The shaft 54 is screw threaded and hasV formed therein a longitudinal groove 55 having'engaged therein a guidekey 5lV rigid with the bracket 30.

In a recess 5B in the bracket 35 there is pro.:

vided a tapped sleeve 59, said sleeve engaging the,

1 `bears against the abutment plate 55.

shaft 54 and having its ends abutted againstthe'Y walls of the recess 58.

The said sleeve has, Y mounted thereon a pinion G adapted to cooperate u with a worm formed on a shaft Eil;journalledA transversely in the bracket and operated by means of a knob 52 provided with a movable dial furnished with resilient arresting means, the said dial co-operating with a fixed graduated scale providedlon the mechanism.

A spring 63having one of its ends attached to a ring 64 fixed to the carriage 'IZ (see more particularly Fig.v5) has its oppositeend engaged by a bar ,65 terminating in a pawl 65; The said pawl is adapted to engage one of a series of corresponding teeth offa rack S'I fixed to a laterally protruding portion of the bracket 36 (Fig. 6), the function ofv the spring and rack assembly being to press the shaft 54 resilientlyA against the abutment plate 55 on the carriage. VAt the rear of the pawl 55, the bar 55 is provided with a clevis 68, the clevis pin AGil being adapted to cooperate with a hook 'I0 formed on the end of a control lever "Il, pivotally mounted at 'I2 onto the carriagejlz. R 11' When the lever 'II is shifted from' left to right, the 'hook I0 is brought into engagement with the clevispin 69 and retraots the pawl' outof engagement with the teeth of the rack 36'?. Stops 'I3 are adapted toV limit the stroke of the Vlever 'EI in'either direction of moi/ement.A `On the other hand, when the 'saidlever is shifted from right togleft-whi'ch is effective in the pawl '56 engaging one `of the teeth of the rack 6l, in accordance with the diameter of the stock to be ground--V the rack teeth, so 'thatthe pawl' Vwill `be held correctly by the teeth. 'p

Thescrews 74 bywhich the abutment plate 55 is fixed in place are provided with conical heads which act as stops adapted to`v limit the magnitude of pendulous movement imparted to vthe grinding `mechanism bythe actionof the operator when the latter actuates the handle V3S for this purpose. Y rIfhe above described vfeed mechanism Yfor the grinding wheel makes it possibleY to' eiect the adjustment Vof the position of the'grinding wheel 34v with respect to the axis of the stockV to be ground, withaccuracy. The aforesaid mechanism further enables the said grinding wheel to be quickly retracted from its operative position, which result is vachieved through the Aactuation of the lever 1I, which, by disengaging the pawl 56 from the rackr'his effectivey in shutting out the action of'the resilient locking device for lthe grinding mechanism, so that the sleeveV 2,9V by which theV latter is suspended on the ycarriage is applies a manual' pull on the knob d8.V f

When the grinding` mechanism is infthe' re# able to slide onA the shaft 28 when the operator ,Vertical displacement of the carriage I2 along the guides II in the course of the grinding operationj -is' normally effected by actuating the crank 4S which operates a shaft l5 carrying a fwormgj `engaginga pinion 55 integral with a Y pinion-52 (Fig. 7), the latter pinion co-operating with a' rack 53 fixed to the standard Il). The pinion 50 and the pinion 52 are keyed onto a shaft 5| journalled in the carriage I2 and adapted to be operated by a crank Ti. The shaft 15, which is operable by the crank 49, is rotatably mounted in a housing 'I3 adapted to be rocked around a fulcrum pin 'I9 supported on the carriage I2. A rod til pivotedto they housing 1B and subjected to the action of a spring y8l tends to keep the worm 'i5 in constant mesh with the Dinion 5i).

Owing the lparticular arrangement of theoperating gear for effecting ythe vertical displacements of the carriage, as above specified, a fine adjustment' of the feed of the said carriage may be obtained in the course of the grinding operation, which israchieved in operating the handle 49,while,` on'the'other hand, the said carriage may be fed at a greater speed when it is required `to vchange over from 'one crank pin "to another or 'from' one bearing surface to another.

In order to perform the high speed movement of the carriage, Athe operator willgrip withv his right hand the crank 59, pulling 'the latter downwards against the opposing action' of 'the' spring 8l, which movement causes the housing 'i8 to be rocked around the fulcrum pin 19,' thus disengaging the worm I5 from lthe pinion 58. Once the worm `il has been disengaged from thel pinion '50, ythe operatoriwill actuat'e withhis' left hand vthe crank il which will 'operate the pinion 52 and will cause the displacement ofthe ca'rf riage in the desired direction until .the new operative position is reached. The operator will then release the crank 49, thus allowing the'worm 'I6 to return automatically into'mesh with the pinion 50 under the action of the spring 8 I.

Owingv to the vertical arrangement ofY the crankshaft inthe device according Vto the in- Vention, the'counterweights vrequired for balancing the crankshaftin a horizontally workingdevice aredispensed with, thus allowing for a substantial saving in labour as far as the operation of placing thework iin the `grinding machine is concerned. Y Due to the' elimination of counterweightsthe rotation of the crankshaftlis` ren-v dered more uniform and the work performed 'is more satisfactory. 'Y j Moreover, the position of stable equilibrium assumed by the crankshaft with the "crankshaft ilange acting asa base when the Work is in po sition onthe Vchuck plate of thergrinding machinelrn'ak'es `the, centering operation4 easier and more expeditious.

Furthermore, the centringof the`*crankshaft greatly `facilitated-and re'ndered' lmore. expeditious by'theprovision'of 'thepl'ate llwhich is adapted to slidewith respect to the plate '3.

.In 'acrankshaftfgrinding machine, a base, ahorizontal rotatable -plate on the said base, means on-fthe' said plate for centering and fixing the "crankshaft tothe lground in the Vertical position, ane'lectric motor supported by thesaid base, a V-belt transmission for connecting'theA said motor'tothe said-plate, a standard secured onto the said base, vertical slides associated with the said standard, a head stock for being xed in an adjustable position o-n the said slides and for supporting the end of the stock to be ground, a sliding carriage on the said slides, a counterweight for balancing the said carriage, a linking member for connecting the said carriage to the said counterweight, means associated with the said carriage for operating the vertical movements of the latter along the said slides, a grinding device suspended for rocking motion on the said carriage, and means for moving the grinding device radially with respect to the axis of the stock to be ground.

2. In a crankshaft grinding machine, a base, a horizontal drive plate on the said base for centering, for securing and for driving the crankshaft in its vertical position, a standard secured onto the said base, slides on the said standard, a counterweighted carriage for sliding along the slides, means for operating the vertical displacements of the said carriage along the said slides, horizontal cylindrical guiding means associated with the said carriage and located radially with respeci; to the axis of the stock to be ground, a grinding device, a sleeve associated with the top portion of the grinding device for sliding movement on the said guiding means and for enabling the said grinding device to rock around the said guiding means, a grinding Wheel shaft journalled in the said grinding device, an electric motor secured beneath the said grinding device, a belt transmission for connecting the said motor to the said grinding wheel shaft, means for adjusting the radial distance between the grinding device and the axis of the stock to be ground, resilient means for maintaining the said grinding device in its operative position, means for rendering the said resilient means inoperative, and means for said .grinding 'device and the said carriage for keepinglthe said screw threaded shaft in contact with the said ixedfabutment provided on the carriage, and means for rendering the said resilient connection inoperative and for causing the saidk grinding device to slide on the said horizontal guiding device.

4. In a crankshaft grinding machine, a base, a horizontal driveA plate on the said base for centering,.iorisecuring and 'for-driving the crankshaft in its vertical ,position-aV standard secured 'onto the said base, slides on the said standard, a counterweighted carriage sliding along the said slides, means for operating the vertical displacements of the said carriage along the said slides, horizontal cylindrical guiding means associated With the said carriage and located radially with respect to the axis of the stock to be ground, a grinding device suspended for rocking and for sliding movement on the said guiding means, a fixed abutment secured tothe said carriage, an adjustable abutment provided on the said grinding device for cooperation with the said fixed abutment, a tension spring having one of its ends hooked to the said carriage, a pawl carrying member hooked to the other end of the said spring, a rack integral imparting manually a limited rocking movement to the said grinding device.

3. In a crankshaft grindingI machine, a base, a horizontal drive plate on the said base for centering, for securing and for driving the crankshaft in its vertical position, a standard secured onto the said base, slides on the said standard, a counterweighted carriage for sliding along the said slides, means for operating the vertical displacements of the said carriage along the said slides, horizontal cylindrical guiding means associated with the said carriage and located radially with respect to the axis of the stock to be ground, a grinding device suspended for rocking and for sliding movement on the said guiding means, a fixed abutment secured to the said carriage, a screw threaded shaft slidably mounted in the said grinding device for co-operation with the said fixed abutment, a tapped sleeve engaged upon the said screw threaded shaft and having both of its ends abutted in the said grinding device, a pinion secured around the said tapped sleeve, a worm journalled in the said grinding device for driving the said pinion, a knurled knob for operating the said Worm, a resilient connection between the with the suspended grinding device the said rack having one of its teeth normally engaged by the pawl on the said member, a clevis formed at the back of the pawl on the said member, a pin in the said clevis, an operating lever pivoted in the said carriage, a hook on one end of the said lever for engaging the said clevis pin and disengaging the said pawl from the said rack When the said operating lever is moved angularly in one direction and for re-engaging the said pawl of the said member in the said rack when the said operating lever is moved in the other direction for disengaging the said lever from the said clevis pin.

5. In a crankshaft grinding machine, a base, a horizontal drive plate on the said base for fixing and driving the vertically positioned crankshaft, a standard secured to the said base, slides associated with said standard, a counterweighted carriage for sliding along the said slides, a horizontal cylindrical guide associated with the said carriage and arranged radially with respect to the axis of the stock to be ground, a grinding device suspended for rocking With respect to and for sliding along the said guide, means for adjusting the radial distance between the said grinding device and the axis of the stock to be ground, resilient means for maintaining the said grinding device in the operative position, means for rendering the said resilient means inoperative and for causing the said grinding device to slide along the said guide, a rack provided along the slides of the said standard, a shaft supported in the said carriage, a pinion secured onto the said shaft for co-operating with the teeth of the said rack, an operating crank associated With the said shaft, a second pinion secured onto the said shaft, a rocking housing pivoted to the said carriage, a shaft journalled in the said housing, a crank handle for operating the said second shaft, a Worm integral with the said second shaft for cooperating With the said second pinion, and a spring for acting on the said housing for maintaining the said worm in engagement with the said second pinion.

6. In a crankshaft grinding machine, a base, a horizontal rotatable plate on the said base, a diametrally extending groove in the said plate, a support associated with the said plate for sliding ground, a carriage slidable on the said slides, a counterweight for balancing the said carriage, linking means for connecting the said carriage to the said counterweight, means associated with the said carriage for operating the vertical displacements thereof along the said slides, a grinding device mounted for rocking motion on the said carriage and means for shifting thesaid grinding device radially with respect to the axis of the work 10 to be ground.

JULES MIESSE.