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Mm}; 15, 1938. 2,111,060 P. E’. BOYD SAFETY MECHANISM FOR PUNCH PRESSES Filed April 20, 1936 > 5 Sheets-Sheet l . March 15, 1938. > P. E. BOYD 2,111,060 SAFETY MECHANISM FOR PUNCH PRESSES Filed April 20, 1936 s Sheets-Sheet 2’ in f? llllI t // I l§_| v I 2/ F 4" 6) :11 LL: 2L; ill-g;- /7 l6 //-‘ A7 “.LE ‘,2; - ‘ TEE ~ F E415 g1N 3 ic. Q? A 1 /6 I HHI ‘ K x March 15, 1938., P. E. BOYD - 2,111,060 ‘ SAFETY MECHANISM FOR PUNCH‘ PRESSES Filv_ed\ April 20, 1936 3 Sheets-Sheet 3 l/YVE/V TOIQ: 2,111,060 Patented Mar. 15, 1938 UNITED STATES PATENT OFFICE 2,111,060 SAFETY MECHANISM FOR- PUNCH PRESSES Percy E. Boyd, Detroit, Mich. Application April 20, 1936, Serial No. I75,291 4 Claims. This invention relates toimprovement in safety appliances ‘adapted for punch presses, and pro vides a device of this’ character embodying a certain mechanism that is coordinated with the clutch of the press for the purpose of preventing premature engagement and disengagement of the same, which is due to the corners of the jaws of the clutch head and those of the bull gear being rounded as result of Wear. _ . (Cl. 192—24) venting premature disengagement of the press at all times. Another object of the invention is to improve the device as set forth in United States Patent No. 2,014,758, issued to me September 17, 1935, and to further the development in this particular line of industry. The invention possesses further advantages, all of which will appear concurrently with the fol As this wearing- process becomes more severe the rounded corners of the clutch jaws have a lowing detailed description, illustrated through tendency to engage the ‘jaws of the bull gear con pointed out in the sub-joined claims. With reference to the drawings: Figure 1 is a reduced partial view of the punch tinually‘when the latter is idling and with a pro r nounced clattering or pounding effect, thereby causing a rapid wear and rounding of all corners of both sets of jaws, and to the extent whereby ‘all of the jaws must be removed andlreplaced with new ones, which requires considerable delay and expense at frequent intervals from this cause. Also with this dif?culty the crank of the press willvnot be caused to stop precisely at high dead press and as the device will appear thereon; and in this view the jaws of the press are shown with the proper clearance when the bull gear is idling. Figure 2 is also a reduced partial view of a punch press, and showing the device in the act of releasing the jaws of the clutch, head from 20 those of the bull gear.. 7 _ vcorrectly. On the contrary the crank will stop approximately from ?ve to ?fteen degrees before high dead center is reached. This condition pre vailing the crank will have the tendency to, and very frequently does drop to low dead center, Figure 3 is a top plan view of the hanger of the device, and broken in places as indicated. Figure 4 is an elevation of the hanger pin. Figure 5 is a part section and front elevation of the bracket and hanger. Figure 6 is a side elevation of the bracket with simultaneously operating the press .at an unex a portion thereof broken away as shown. center as it should do when the same is operating pected time and without Warning to theoperator, 30 which may result in a serious, accident to him. It is understood that the jaws of both the bull gear and clutch head of punch presses have per fectly sharp edges when they are new, and as these elements are engaged in repeated opera 35 tions the edges will become rounded thus per mitting their premature engagement and disen gagement, whereas if said edges arev kept from being worn this condition is avoided, and it is the purpose of this invention to prevent the wear 40 ing of the clutch jaws and thereby make it im possible for the dangerous accidental tripping of the press and rendering the same decidedly more safe for the operator. Premature release of the clutch‘jaws is due to 45 the worn condition of the clutch jaws. When the jaws are new and unworn, they are sharp and remain in engagement until roller 0 reaches a point upon cam M corresponding to high dead center of the press. Torque is transmitted '50 through the clutch until theclutch jaws fully clear each other. With worn jaws however, when the movable jaws are retracted to a point such that the worn ends of the jaws overlap, there is ‘a component of force tending to cam the mov able jaws away from the other jaws before roller 0 has reached the point on cam M correspond ing to high dead center of the press. The principal object of this invention is to com 60 pletely overcome this di?iculty by positively pre 10 out the accompanying drawings, and more fully Figure 7 is a top plan assembly of the complete device. . Figure 8 is a top plan view of the bracket. Figure 9 is a front elevation of the hanger. Figures l0, l1, and 12 are greatly enlarged cross sectional views of both sets of jaws of the press, and Figure 10 indicates a worn condition 35 of the jaws; Figure 11 shows the jaws when they are new and unworn, and Figure 12 shows an advanced state of worn jaws, or approximately the usual limit in this respect. Figure 13 is a reduced elevation of the plunger safety cap. Figure 14 is a. sectional assembly of the cap‘ taken vertically through the center thereof. Figure 15 is a top plan view of the safety cap housing. Figure 16 is a section taken directly upon line l?-lii of Figure 14; and Figure 17 is a section upon line l'l-—I'I of Figure 14. The invention comprises hanger l of the forma tion as indicated and is adapted to be detachably secured to frame A of the press by cap screws 2 where shown, and remains permanently in this relation with said frame. f A bracket is provided, having body 3 and the upper portion of said body being extended there from and forming neck 4 with transversely ex tending aperture 5 therethrough, and said bracket is adapted to be pivotally secured to hanger l by means of pin 6 with said aperture and the usual cotter pins therefor. Apertures 60 2 2,111,060 15 in hanger l are provided to accommodate pin 6. Extended from neck 4 is enlargement 1 having vertical passage 8 therethrough for accommodat ing plunger B, also enlarged vertical passage 9 through lower enlargement I? of the bracket for accommodating the lower portion of said shaft. Referring to Figure 8 hub H is provided and is projected from body I where shown so that lever 10 C may be pivotally secured thereto by cap screw I2. . turn of roller 0 into the path of cam M, the clutch is disengaged. While torque is being transmitted through clutch jaws J and K, cam M swings the plunger B to the tilted position shown in Figure 2, thereby initially compressing auxiliary springs D. As soon as roller ,0 and cam M effect the disengagement of the clutch jaws, springs D react through roller 0 and cam M tofurther separate the clutch jaws as shown in Figure 1. Thus, when the clutch is disengaged, there is always ample 10 . clearance between the clutch jaws and accord bracket so as to clear spring D upon sleeve E and ingly, the undesirable wearing of the corners thereof is prevented. Having thus fully described my invention, what stud F, and referring to Figure 1 it is understood that studs F are adapted to threadedly engage I claim as new is: 1. In a safety mechanism for a punch press, a frame A as at G. brackethaving a vertically disposed body, an en In Figure 6 elongated recessed portion I3 is provided upon each side of enlargement ill of the ' The lower end of plunger B has eccentrically mounted roller 0 thereon which is adapted to engage clutch head H, and it is further understood that by virtue of springs D'jaws J of said'head will remain clear of jaws K of bull gear L. When the clutch is tripped for causing engagement, roller 0 is retracted upwardly until it is out of the axial path‘ of cam M‘and all parts of the clutch head 1-1. It is understood that after'the operation of the press and cam M returns to nor mal position as in Figure 1, jaws J and K will be largement projected from the lower portion of said body having a vertical passage therethrough for accommodating the plunger of a punch press, the combination with a‘ pair of studs, one of said studs disposed upon each side of said enlarge ment and adapted to pass through aforesaid body and to threadedly engage the frame of the press, each of said studs having a sleeve with a spring 1 upon the sleeve, means within each of said sides ‘of therenlargement for clearing said springs, com prising an elongated recessed portion. with a tension adequate so as to overcome springs 2. In a safety mechanism for a punch press, a bracket having a vertical body, an extended en 30 N, and in this manner it is clearly understood largement upon the upper portion of said bracket that springs D will "prevent engagement of jaws J of clutch head H. and jaws K of bull gear L, and ‘a similar enlargement upon the lower por tion thereof, both of said enlargements having 'a thus positively preventing operation of the press vertical p'assage'thereth'rough for the accommo when the same is idling and vwear of the clutch dation of, the'plunger of the press,-a hub ex 35 tended upon one side of said bracket and at right completely disengaged and springs D are provided jaws. In the construction of punch presses it has always been customary to provide a weight angles theretovfor accommodating a lever of the that is mounted upon the top end of plunger B, trip mechanismofthe' press,’ and an elongated for obvious reasons, and 'due to the proportion , recessed portion upon each side of aforesaid lower 40 of this weight and being inadequately supported enlargement so as to clear a pair of studs pass- 740 to said plunger, very frequently it breaks off of ing through aforesaid body and threadedly en the plunger and falls to the ?oor and with grave gaging the frame of the press, each of said studs danger of injuring the press’operator and "other having a sleeve and a spring upon said sleeve. 3; In a safety mechanism for a punch press, damage. . In order to completely overcome this difficulty a safety cap arrangement is provided and com prises housing ld which is adapted to be detach ably secured to the top surface of enlargement a hanger and means for’ securing same to the 45 frame of the press,‘a bracket and means for piv otally securing the same to said hanger, an en accommodation of screws I6 as indicated. largement upon the upper portion of said bracket and a similar‘ enlargement upon the lower por tion thereof, each of said enlargements having a ‘vertical passage therethrough for the accom modation of the plunger of the press, a hub ex tended upon one 'side of said bracket and at right Referring more particularly to Figure 14 it is understood that the top end of plunger B is pro mechanism of the press; the combination with a 55 I by cap screws l6 through ?ange ll of said hous ing, and it is seen that said flange‘ is adapted to conform substantially to said enlargement. Apertures !8 are’ provided in ?ange II for the 5,0 angles thereto so as to receive a lever of the trip vided with a shoulder as at i9 so as to receive pair of studs passing through said bracket and and retain the lower end of spring 29, and the engaging the frame of the press, each of said upper end of said spring bears against floating ' studs having a sleeve thereon and a spring upon disc 2|. Screw 22 is provided and is adapted to said sleeve, and means upon each side of the 60 threadedly engage housing 14 where shown, ‘with. 'aforesaid'lower enlargement of said bracket for 60 clearing the springs aforesaid. lock nut 23 as indicated. ' The object of spring 2b is to provide the re quired pressure downwardly upon plunger B to substitute the weight previously explained, and the tension of said spring is effected by screw 22. All parts being inclose‘d’ in housing I4 spring’ 20 is thereby protected in a manner so as to perform ' its duty accurately at all'times. 70 rI‘he clutch operates in the following manner: Engagement of the clutch is e?ected in the‘ or dinary manner by moving roller 0 radially out'of contact with cam M, whereupon springs N thrust the clutch jaws into engagement. Upon the re 4. In a safety mechanism for a punch press having a tiltable bracket and a plunger, a cap for said plunger, said cap comprising a housing and means for detachably securing said housing to aforesaid mechanism directly over said plunger ' and in axial alignment with the same, a coil spring freely disposed within said, housing, said spring bearing upon the top of said plunger, the upper end of the spring bearing against a ?oating 70 disc. ' PERCY E. BOYD.