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May 11, 1937. E. MUHLBACHER 2,080,089 GRINDING APPARATUS Filed March 17, 1934 5 Sheets-Sheet 1 45?? 1..IE. INVENTOR: ?J ' -' I . г~eewsqr Mb'mzacnse, By. Mayll, 1937. 2,080,089 E. MUHLBACHER GRINDING APPARATUS Filed March 17, 1934 3 Sheets-Sheet 2 / mm? 2 , Q? 7 INVENTOFf: 3y: Mae/ah?!? , ? Ax ~ May '11; 1937. E. MUHLBACHER 2,080,089 GRINDING APPARATUS Filed March 17, 1934 :cr. 3 Sheets-Sheet 3 E1. .5 - ' INVENTOT.? г~згLaгkr "Jams/?CHER, Patented May 11, 1937 2,030,089 l UNITED STATES PATENT OFFICE 2,080,089 GRINDING APPARATUS Engelbert Miihlbacher, Los Angeles, Calif. Application March 1'7, 1934, Serial No. 716,082 6 Claims. (Cl. 51-109) This invention relates to devices used for ?nish tering supports, such as roughly outlined at 20, ing and re?nishing rounded surfaces, such as on may be applied at any suitable or required place crank-pins and cams. of the shaft, not in the least to interfere with One of the objects of this invention is to main the mechanisms of this apparatus. tain the approximate position of the grinding The actuating or controlling attachment, illus-? 5 wheel by cooperating guiding means contacting trated in Fig. 5, is of a type to be applied to one with a surface in pairing relation to the surface ofa pair of crank-pins, to cooperate with the upon which the grinding wheel is operating. grinding attachment illustrated in Fig. 4. Another object is to provide a simpli?ed?ar The attachments of the type of Figs. 4 and 5 10 rangement for changing from one crank-pin to depend for their proper cooperation upon the two 10 another or from one cam to another on the same shaft. Another object is to provide for accurate ad justments of the grinding wheel, making the ap paratus economic and e?icient. Other objects will appear from the following description and appended claims as well as from the accompanying drawings, in which- ? Fig. 1 is a front elevation of a grinding ap control-shafts 2| and 22, extending throughout the whole length of the apparatus in front of the main frame structure, as more clearly illustrated in Fig. 2; in Figs. 4 and 5 the shafts 2| and 22 ap-_ pearing alone, in cross-section, while the main 15 frame structure is left off. ~ ' Any movement of the crank-pin, indicated in Fig. 5 at 239. of the crank | 8, indicated in Figs. 1 and 2, is transmitted to the control-shafts 2| paratus designed to operate according to this in vention. Fig. 2 is a fragmentary top plan view of the apparatus illustrated in Fig. 1. Fig. 3 is a fragmentary longitudinal mid-sec anisms' illustrated in' Fig. 4. tional view of one of the main operating shafts. Fig. 4 is a fragmentary cr?oss?section on line The control mechanisms include therefore a control-arm? 24 provided with an adjustableend, 25 and 22 by means of the control attachment or mechanisms illustrated in Fig. 5; ?and the move ment received by the control-shafts 2| and 22 is transmitted? to the grinding attachment or mech ' 4?-4 of Fig. 1, showing the grinding mechanisms designed? to suitably engage the crank-pin 239. in end-elevation. by means of the contact-members 25 and 26, Fig. 5 is a fragmentary cross section on line ?rmly provided on the arm 24, and another con 5?5 of Fig. 1, showing the control or guiding. tact-member 21 provided on the adjustable clamp 30 mechanisms in end-elevation. 28, whereby? a suitable??rm journal-connection Fig. 6 is a fragmentary cross section similar to can be provided for the arm 24 with the crank the illustrations of Figs. 4 and 5, in this case pin 23a, adjustable to suit di?erent crank-pins. showing a slightly modi?ed form particularly ? The opposite end of the? arm 24 is pivotally con adapted for use on cam-shafts. ' nected'at? 29 to the lever 30, the lever? in turn be- 35 Though the principal mechanisms can easily ing'remova?bly mounted on the control-shaft 2|, be applied to any common lathe or similar ma the hinge-connection at 3| and the clamping con; chine tool; as illustrated, however, the whole ap nection at 32 serving for adjustments of the lever paratus is arranged on a special frame structure, with respect ?to the control-shaft 2 I. consisting in the main parts of the bed or cen? ?A link 33, at one end pivotally connected at?34 40 tral portion II, the leg-portions l2 and I3, and to the arm 24, and at the opposite end pivotally the head-portions l4 and I5, indicated in Fig. 1.? connected at 35 to a second lever 36, which in turn From a motor, not shown in the drawings, in is' adjustably mounted on the control-shaft 22, the leg-portion 52, a belt i6 transmits the mo serves to transmit motions of the crank-pin 23a, to tion to head-pulleys IT, by means of which a crank-shaft I8 may be rotated between points H of the head-portions M and I5. If the crank-pins of a crank-shaft are to be ?nished or re?nished, the main portions of the crank~shaft are naturally well centered between such points It, referred to above, and the different crank-pins of the crank-shaft maintain a cer tain relation to the central axis around which the shaft rotates. -' With especially long shafts any customary cen the control-shaft 22. ' ' ? ? ? 45 From the illustration of Fig. 5, and also with reference to the illustrations in Figs. 1' and? 2, it will be understood that any rotating of the shaft I8 between the points ,l9, and thereby any swinging movements of the crank-pin 23a, results in oscillatory turning movements of both of the control-shaftsv 2| and 22. 1 j These oscillatory turning movements are uti lized for the proper operation of the grinding mechanisms illustratedin Fig. 4. . 55 2 2,080,089 In internal combustion engines, modern crank~ shafts customarily have crank-pins in pairing relation, making it possible that the control mechanisms can be applied to one of the pairing crank-pins of a shaft, as at A, while the grinding mechanisms are applied to another of the pair ing crank-pins of the same shaft, as at B, in Figs. 1 and 2. Under this consideration, it must be under stood that the di?erent levers and arms and con nections of? the control-mechanisms of Fig. 5 as well as of the grinding-mechanisms can be so designed that the grinding-wheel 3?! is just in a position to always follow the crank-pin 23b ac the lever 36a, on the shaft 22 can be made to fol low any movements of the lever 300. on the shaft 2| when operated by the pin 41. In Fig. 3, a fragmentary detail slightly en larged illustration shows a simple and advanta geous construction of the shaft 2|. A slightly modi?ed form of control mechanisms is illustrated in Fig. 6. The lever 30b is held in a rigid position by the link 49, so that the shaft 22 0 alone is free for oscillatory turning movements. This form is particularly suited for cam-shafts, of which a cross section is indicated at 50, the grinding wheel indicated at 31 eventually to be cording to the pairing crank-pins 23a position, on the same type of grinding mechanisms as controlling the movements of the control-mech illustrated in Fig. 4, in Fig. 6 being merely indi anisms, whereby the grinding-mechanisms are cated in dotted lines to illustrate a grinding of a cam opposite to the cam responsible for the movements of the control mechanisms of this so maintained as to bring the grinding-wheel to the proper relation to the crank-pin 23b operated 20 ing means as indicated at 48 in Fig. 5, whereby upon by the grinding-mechanisms. 1 ? - It may be said that the position of the grind ing mechanisms is only approximately following the crank-pin 23b, but that is su??lcient, and that is exactly as it is desired. For the sake of assuring accurate movements 25 type. The arm 2% is provided with a number of holes 5| by which a link 52 is adjustably and pivotally connected at 53 with one end, the opposite end of the link 52 being pivotally connected at 54 to an adjustable contact-arm 55. in the grinding mechanisms with respect to the A bracket 56 mounted on the bed or central particular pin, or cam, or surface, distinct ad justments are provided directly on the grinding mechanisms. The link 33a is provided with an adjustment 38 whereby the contact-end 39 can portion | | of the main structure embodies a pivot 51 on which the contact-arm is adjustably mount ed for swinging movements, the bearing-blocks 58 and 59 being shiftably mounted in the con tact-arm 55 controllable by the adjusting means 60 and 6|. be varied with respect to the crank-pin 23b, for direct or positive contact as well as for spacing relation. - Regardless, however, of whether the contact 35 ing end 39 is used as a direct guiding means for the grinding-mechanisms, or not, a separate ad justing mechanism, indicated at 4|], serves to bring the grinding-wheel 31 into operative posi tion with respect to the crank-pin 23b. Assuming ?the arm 24a, is following closely the movements of the arm 24 of the control-mecha nisms of Fig. 5, and also assuming that levers 36a and 30a, of the grinding mechanisms are rather accurate duplicates of the levers 36 and 3!) of 45 the control-mechanisms of Fig. 5, a base 4| with a balancing weight 42 is provided mounted on the pivot 29a adjustable by the adjustment 40 so as to vary the position of the grinding-wheel 3.?! nevertheless. This arrangement makes it possible that the ?so grinding wheel can be adjusted to a position to assure any desired accurateness. Adjusting the arm 249. so as to contact the end 39 with the crank-pin 23b, to be operated 55 upon, the adjustment ?40 can be controlled so that the space between the contacting end 39 and the grinding wheel 31 is just the desired dis tance equaling the thickness of the crank-pin wanted in the finished pin or re?nished pin. The grinding mechanisms must then be said to be held approximately, though really rather accurately, to follow the crank-pin 23b, accord ing to the movements of ?the crank-pin 233., by means of the control-mechanisms, and, in addi 65 tion, be guided by the adjustable guiding facili ties directly on the grinding mechanisms. The upper parts ?43 of the grinding mecha nisms are furthermore adjustable with respect to the base 4| by ?means of the spindle and han dle '44. The whole grinding mechanisms can also be Of course, this modi?ed attachment can also be used for larger strokes than customarily ex ist on cam?shafts, a proper operation merely ' depending on a proper proportioning of the sev eral levers, easily arranged by any mechanic. Furthermore, such an attachment can be de signed to function on oppositely disposed cams or cranks as well as on pairing cams and cranks, ~10 the tilting contact-arm 55 being readily used for oppositely disposed surfaces, while the arm 24b is then just as easily applied to pairing surfaces, in the manner described above. From the detail illustration of the shaft 2| .. it will be clear that the gear-rack 45 is mounted in the shaft 2 I, which in turn is turnably mount ed on an inner shaft 53, a bearing sleeve 62 serving to assure a proper wearing of the bear ing surface, making an exchange of wearing sur 50 faces easy, the whole being held in place by the set rings 64, such arrangement, of course being provided on the opposite ends of the shaft 2|. Having thus described my invention, I claim: 1. In a grinder, an operating structure in- - eluding supports by which a crank shaft can be rotated around its central axis, a control mechanism designed to follow the movements of a crank of the crank-shaft, operating shafts disposed alongside of said structure with their axes parallel to the ?rst-named axis, the control mechanism including means for imparting oscil latory rotating movements to the operating shafts, a grinding mechanism in operative con nection with said operating shafts and thereby with said control mechanism, adjusting means on the control-mechanism for setting the con trol-mechanism on said operating shafts with respect to said crank-shaft, other adjusting means for holding the control-mechanism snugly to a crank of the shaft, other adjusting means on adjusted along the oscillatory shaft 2| by means the grinding mechanism for setting the grind of ?the gear-?rack 45 on the shaft 2| and the gear ing mechanism on the operating shafts for co '46 in the-lever 30a, controllable by the pin 41, operation with said control-mechanism, contact the lever 369. being ?provided with similar clamp means on the grinding mechanism for contact 75 '3 2,080,089 ing with a crank of the shaft, further adjusting means for contacting the grinding mechanism with the crank, and still further adjusting means for the grinding \mechanism transversely to the operating shafts, the grinding mechanism in cluding an actuating and an actuated portion pivotally connected, and a balancing means for the grinding mechanism. 2. In a grinder, a contact-arm having a pivot support at one end and means to contact with the side of a crank-pin at the opposite end, a grinder base designed to support a motor and a grinding Wheel and having means to pivotally connect with the contact arm, and a counter balance on the base for balancing the base with motor and grinding wheel on the arm. 3. In a grinder, a contact-arm having a pivot support at one end and means to contact with the sideof a crank-pin or cam at the opposite 20 end, a grinder base designed to pivotally rest on the arm and having means for siidingly sup porting the grinder proper, the grinder proper being adjustable transversely to the axis of the pivot. 25 4. In a grinder, a control-mechanism for use on cam-shafts comprising a control-arm with a pivot-support at one end and actuated means at a distance from the pivot-support, the contro1~ arm having various connections spaced differ to said connections, blocks siidingly mounted in the contact-arm in pairs with the adjoining faces designed to engage a pivot-support, and adjust ing means for the blocks for varying the oppo sitely disposed lever-ends with respect to said adjoining faces. 5. In a grinder, a control-mechanism for ?use on crank-shafts comp-rising a control-arm with a pivot-support at one end and actuated means at a distance from the pivot-support for control 10 ling the movements of the arm with respect to the pivot-support, the control-arm having con tact means to siidingly engage against the sides of crank-pin at the opposite end with respect to the ?rst-named end, and a clamping member having contact-means to adjustably cooperate with the ?rst-named contact means for holding the outermost end of the control-arm in con tacting engagement with the crank-pin. 6. In a control mechanism for grinders of the = class described, a control-arm having a pivot support at one end and a contacting means? at the opposite end designed to siidingly engage against the sides of a part to be ground, the arm having an actuating pivot intermediate the two ends, and a clamping member adjustably mounted on the second-named end and having contacting means to adjustably co-operate with the ?rst-named contacting means. 30 30 ently from the pivot-support, a contact-arm having means at one end adjustably connected ENGELBERT MfTHLBACHER.