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Aug. 13', 1946., G. ANTOS ET AL - 2,405,545 AUTOMATIC CLUTCH Filed Nov. 15, 1943,_ INVENTORS. GEORGE HNTOS. fMMEk/Ch' WEBER‘. V HTI'ORNEY. , . ‘ Patented Aug. 13, 1946 UNITE 2,45,545 STATES PATENT OFFRE 2,405,545 ' AUTOMATIC CLUTCH George Antos and Emmerich Weber, New York, N. Y. Application November 15, 1943, Serial No. 510,264 4 Claims. (Cl. 192—28) 1 2 This invention relates to improvements in de vices for engaging and disengaging a constantly revolving part, as a shaft, with a normally quies raising the free end 23a of an arm 23. cent element, as a gear wheel or the like, in order within a recess 28 in the hub 29 of a gear or wheel the mechanism, but may be caused to engage by A pawl 24 of arcuate shape, is pivoted at 26 to communicate rotary motion to it, to control to be driven, and is under the constant pressure other mechanisms, such devices being commonly of a leaf spring 30, riveted within the recess, the called automatic clutches. pawl having a reduced end extension 3|, movable An object of the invention is to provide a clutch in an inclosed slot 27 in the hub of the gear. mechanism that is instant and positive in oper The pawl 24 has, on its concave inner edge, an ation, both for engagement and release, its 10 inreaching lug 33 adapted to be engaged by ‘the strength being limited only by that of the mate one of ends of the bar 21, when the pawl is pressed rial used in its structure. by the spring 33, thereby causing rotation of the A further feature is in the provision of both gear, which may be meshed with others as‘ re automatic and manual means for clutching and quired in driving various mechanisms intermit unclutching the engaging elements, all of which 15 tently. ' are of simple construction, adapted for long con tinued service, and not subject to casual derange ment. A pair of supports 35, ?xed on the base [8, are provided with adjustable pivot screws 33 on which the arm 23 is mounted. The end of the arm, adja Another purpose is to produce a clutch in which cent the gear hub 29, is reduced, as at 2312, along the driven element is prevented from over-run 20 side of which is a leaf 39 pivoted on a pin 40 in ning, being held against an abutment coinciden the arm 23. The arm element 231) and leaf 39 are‘ normally raised by springs 31 and 37a respective tally with its release from the driver, and auto matically stopped in an identical position at each ly, seated in recesses in the base l8, so that the release. outer end 43 of the arm 23b abuts against the end These several objects are accomplished by the 25 3| of pawl 24, thus maintaining its lug 33 out of the path of the driver bar 2!, this being the nor novel and practical construction, combination mal condition. and arrangement of parts hereinafter described, , When the end 23a of the arm is raised, either and illustrated in the annexed drawing, consti manually or as by; the mechanism diagrammati~ tuting a pictorial part of this disclosure, and in 30 cally shown in Fig. 6, the end 43 of lever 231) will which: ‘ be depressed, out'of the path of the pawl 24, thus Fig. 1 is a side elevational view of an embodi permitting the pawl, under the effect of the spring ment of the invention, shown with its clutch in disengaged position. ' 36, to enter the path of the driver bar 2! so that the bar engages the lug 33 to carry the gear Fig. 2 is a top plan view of the same. Fig. 3 is a view similar to Fig. l, but showing 35 around with it until the lug is released. In the modi?ed form shown in Figs. 4 and 5, the clutch members as at the beginning of their the bar or pin 2| is omitted and for it is substi operative engagement. tuted a ratchet toothed star wheel 44 pinned or Fig. 4 is a side view of modi?ed clutch engaging keyed to the shaft I9, all other elements remain members, others being omitted. Fig. 5 is a view similar to Fig. 4, but showing 40 ing as previously described. Should it be required to operate the clutch au the clutch members in full engagement with a driven element. ' ' Fig. 6 is an end View of Fig. 1 showing an ad ‘ tomatically the arm 23 may be provided at its outer end 23a with a narrow extension 46 having justable automatic means to release the‘ clutch 45 bevelled side edges It‘! and 48, as shown in Figs. 1 and 2, and viewed also in Fig. 6. members from engagement. A slide rail 49, provided with a tenon 58, is ar Referring in greater detail to the drawing, the ranged to move transversely below the extension clutch, generally designated by the numeral I5, 46, and adjustably mounted on it are dogs 5| hav is shown as mounted in bearings l6 and H’, car ing raised angular faces 52. ried on a base 13; in these bearings is a shaft 19 50 These dogs may be held in adjusted position by constantly rotating in the direction of the arrows clamp screws 53, and their angular faces inclined 2B, seen in Figs. 1 and 3. in either direction; obviously, upon contact of the A driver bar 2| is set rigidly in the shaft to pro faces with the extension 46, the arm 23a will be trude at one or both of its ends 22, which are bev tilted upward on its trunnions and the clutch elled and normally clear the adjacent parts of 55 elements disengaged. 2,405,545 4 3 In engaging the clutch elements, let it be pre sumed the shaft i5 is constantly rotating, car rying either the driver bar 2i or star wheel 44 with it. As shown in Fig. l, the arm element 232) has, near its outer bevelled terminal 43, a ?at tened upper surface 4% seated against a cam like surface 42a in a lateral recess of the hub 29. The extremity 43 of the arm abuts the tip of the reducedend 31 of the pawl 25, thereby prositively preventing the pawl lug 33 from engag~ ing the driver bar 21, and the “fiat” 420: will be projection on said member, said projection con taining a chambered recess and an indentation in its exterior, a pawl pivoted in the recess and hav ing a part engageable with said toothed element, a spring urging the pawl into engagement, said pawl having its free end extending into the in dentation, a spring-raised tiltable lever arm to intercept the pawl end when in a raised posi tion thereby to displace the same from the toothed element, a leaf pivoted to said arm and normally spring-pressed against said hub-like induced to come to rest against the flat surface 421) on the arm by reason of the pressure exert~ ed by spring 31 thus assuring at all times, a re projection to serve as a brake, and adjustable means’for actuating said arm. 2. In- a clutchfor engaging a constantly rotat turn by the hub or casing 29 to its initial radial 15. _,ing. shaft with an encircling member, one or position. more aligned lateral projections on said shaft, a Engagement ensues by raising the outer ele-r ment 46, or adjacent part 230;‘ of the arm, there pawl pivoted'in said'member, a spring urging said pawl to engage the projections, said pawl having its free end extending outwardly beyond said by tilting the opposite end 23?) downwardly, clearing the surfaces 421)“ and 52a from contact 20 member, a pivoted. lever,'a secondspringto raise and releasing the pawlv end; piece 31, allowing'the said lever into position- to maintain‘ the pawl, pawl to move, under the urge of‘,v the spring 32, normally out of contact with said‘ projections, and the pawl lug 33*to engage the‘ driver bar 213, or teeth of the wheel 44, thereby transmitting’ ro tary motion to the gear through its hub. However, the upper flat surface of the end of leaf' 39‘ still maintains contact with the “flat” 42a to prevent rotation of‘ the hub 29 until the pawl lug 33 has‘been ‘engaged by the driverbar 2|. Coincidently, the bevelled ‘end it 'of the‘ leaf 39 is pressed downwardly, against" the pressure said lever being tiltable to releasesaid pawl to permit it to be engaged by one of the projections, a leaf 'pivoted to the lever to ride over the sur face of said member to serve as a brake, and means to control the movement of said lever and leaf. 7 ' 3. In, a clutch comprising a constantly’ rotate ing drive shaftv having lateral projections and a chambered annulus therearound having a pawl of'the spring Slat, thereafter to rideron the sur pivoted therein spring urged to engage the pro— face of thehub 29; continuing'todo'so until the jections, a pivoted lever having one end normally lying in the path of, the, pawl end to restrain it arm 23a has been shifted. This can be done manually, or automatically 35 from engagement with the projections and to’ by thedevice, shown best in Fig. (i, which, can be maintain. said annulus quiescent, a leaf having adjusted to suit varying conditions. This‘ device a bevelled outer end to act at times as a brake comprises a rail 5i!" ?xed cross-wisebelow the on the surface of said annulus, and at other times having engagement with a “?at” on the on the rail‘ is mounted one‘ or more dogs 5!, or 40" annulus to restrain it from‘ rotating after the re such length and inclination as may behest‘ suit-' straining means has been moved'from the path ed‘ for‘ their purpose, as for instance the-length of the pawlend' and until the. pawl has engaged of‘time the lever arm is raised, and" hence the the projection, said‘ l'ever' coincidently acting as‘ number of revolutions of the gear-beforethe end a positive stop, a transverse rail slidably mount 53" of ‘the lever againenters the path of thepawl 4 CH 5 ted below the opposite endof saidlevenand one 3i. Attention is invited to the‘ fact‘ that stop ‘or more dogs having angular faces adjustable on ping and starting are instantaneous, and that no said rail to cause tilting of the lever atpredeter possible slip or over-running can occur; further mined points. more, stopping is accomplished in such manner 4. In a clutch for engaging a constantly rotat that the gear, and any connections made to it, ing shaft with an enclircling member, one or are caused to cease rotation‘ at one universalstcp morev alignedlateral projections on said shaft, ‘a ping point, a‘ feature seldom, if ever attainedby‘ pawl pivoted in said‘ member,. a spring. urging any known form of clutch. said pawl to engage the projections, said pawl While the foregoing’i-g descriptive of an actual having its free end extending outwardly. beyond embodiment of the invention; it is to be regard said member; a pivoted lever, a second spring to ed‘ as‘ suggestive, rather than prohibitive of other raise said lever into position. to maintain the forms which the device may assume within the outer end 46 of‘ the tiltable arm 23;‘ adjustably terms of the appended claims. What is claimed as new and sought to secure‘ by Letters Patent, is: 1. man automatically operated clutch includ ing a constantly rotating shaft and a member to be driven at intervals freely‘ mounted thereon, a toothed element ?xed on‘ said shaft, a hub-like pawl normally out of contact with said projec tions, said lever being tiltable to release said pawl to permit it to be, engagedby one of the projec tions, and a leaf pivoted to the lever to ride over the surface of said member to servev as abrake. GEORGE 'ANTOS. EMMERICH WEBER.