Патент USA US2079145код для вставки
May 4, 1937. J. l.. ARTHUR 2,079,145 CENTRIFUGAL CONTROL» FOR TIMERS Filed oct. 7, 1955 ` 2 sheets-sheet 1 _DA fl 1,2 /4 INVENTOR BY Yoîá/ A; ATTORNEY/f May 4, 1937- .1.l L. ARTHUR 2,079,145 CENTRIFUGAL CONTROL FQR TIMERS ' Filed OG'C."7, 1935 2 Sheets-Sheet 2 ¿iq-5' 2' BY alfINVENTOR W ` ATTORNEYJ/ 2,079,145 Patented May 4, 1937 UNITED STATES PATENT OFFICE 2,079,145 CENTRIFUGAL CONTROL FOR TIMERS James L. Arthur, Anderson, Ind., assignor to General Motors Corporation, Detroit, Mich., a corporation of Delaware Application October 7, 1935, Serial No. 43,892 13 Claims. (Cl. ZOO-31) This invention relates to ignition timer dis tributors and has to do with improvements in means for controlling the centrifugal advance range for altering the time of ignition. 5 One of the objects of the invention is to com bine a holddown plate with stop means` for lim iting the range of flyweight movement. Another object of the invention is to provide adjustable stop means' whereby the range of flyweight movement may be altered. A further object of the invention is to im prove centrifugal mechanism for altering the time relation of fuel ignition in response to en . L) gine speed. Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accom. panying drawings wherein a preferred embodi ment of one form of the present invention is clearly shown. In the drawings: 2 Fig. 1 is a vertical section through a timer dis tributor illustrating the improvements herein disclosed. Fig. 2 is a plan view of the holddown plate and stop means for the improved centrifugal mechanism. Fig. 3 is a plan view of the centrifugal mecha nism with the holddown plate and stop; means assembled in position. Fig. 4 is a fragmentary view in section sub stantially as illustrated by the line and arrows 4-4 of Fig. 3. Fig. 5 is an elevational View of the speed re sponsive mechanism. 40 Fig. 6 is a horizontal sectional view through the holddown plate substantially as indicated by the line and arrow 6-6 of Fig. 1 illustrating the fly weights in their in position. Fig. 7 is a view similar to Fig. 6, but illustrat ing the flyweights moved to their outer position. Fig. 8 is a view similar to Fig. 7, but illustrat ing the holddown plate and stop means moved to a second position whereby the range of fly driven by the shaft I4 through the agency of a speed responsive mechanism 30 later to be de scribed. Supported within the housing I0 is a breaker plate 32 having a flange 34 providing an inner race for a series of ball bearings 36 equally spaced about the plate by a spacing band 4.6 operating to maintain the balls 36 in oper ative engagement within an outer race 42, pro vided by the housing I0. The breaker plate 32 l() supports a contact bracket 44 to which is se cured the usual fixed contact that cooperates with a movable contact kcarried by breaker lever 46, oscillatable about a pivot 48 through the agency of a rubbing block periodically engaged by the cam 28. The breaker lever 46 is urged into m engagement with the cam 28 by means of a spring 50 that operates to electrically connect the movable contact with the addition of the lead 52, to a terminal post 54 insulatingly sup ported by the housing I0. Means are provided for shifting the breaker plate 32 in response to engine developed suction by means of a dis placement unit 56, provided with a link 58 piv oted to the breaker plate 32 by means of the device 60. Inasmuch as the breaker plate 32 with its ball bearing support, and the circuit breaker structure is fully disclosed and claimed in a copending application, further description is not deemed necessary herein. The centrifugal mechanism 36, hereinbefore 30 referred to, comprises a Weight .base 62 press iitted upon a knurled portion 64 of the driving shaft I4 at a point removed from its reduced end 66. Secured within the weight base 62 and at substantially diametric points, there are a pair C..‘ CI! of pivot posts 68 upon each of which there is pivoted a flyweight ‘IG that has a. cam engaging arm 'I2 as well as a weight arm 14. The cam engaging arm 12 is designed to have rolling en gagement with the cam face 'I6 of a cam bar 18, which cam bar is press fitted or otherwise secured upon a reduced portion 8D of the cam 28 or an extension thereof, substantially as il Referring particularly to the specification I0 lustrated in Fig. l. The cam 28 has a cylindrical bore 82 providing a bearing for the reduced end portion 66 of the shaft I4. Thus it will be seen that the cam 28 is capable of limited rotation, or oscillating movement, upon the extension oi indicates the usual distributor cup having a shank portion I2 drilled to provide a- bearing for a driving shaft i4. The open end of the housing I0 is closed by a distributor cap I6 pro In order to further control the amount of an gular rotation of the cam 28 upon the shaft ex tension 66, the cam bar ‘I8 is provided with a »- Weight movement is altered. Fig. 9 is a modification of a holddown plate and stop means. viding the terminals I8 and 20 cooperating with the conducting elements 22 and 24 respectively of a rotor 26, supported by a cam 28 variably the shaft I4 through the centrifugal mechanism. pair of spring posts 84 to which springs 86 are connected and thence hooked over the pivot post 68; the springs 86 operating to maintain the iiy 55 2 2,079,145 weights and cam bar in compact relation sub stantially as illustrated in Figs. 3 and 6, wherein the weight arms 74 are held in the inward posi tion close to the extension 80 of the cam. Spacers 8f3 are disposed about the pivot posts B8 and between the weight base 62 and the iiy weights '53, and ribs 90 are provided on the weight base for spacing the weightsslightly above the weight base and for reducing the frictional 10 resistance of their inward and outward travel. Means are provided for confining the weights in their lateral movement upon the pivot post, and for defining the extent of outward move ment. These means include holddown plate 15 which holddown plate is in the form of a shallow cup having a bottom wall |02 with a de pending flange or skirt |04. The bottom wall While the construction thus far described em bodies a deformed portion of the skirt |20 as comprising a iiat, other forms of deformations may be utilized, and a modification of that is illustrated in Fig. 7. In that form, the bottom wall 232 of the holddown plate is apertured at 2| | so as to leave a bendable portion 220 of the skirt 10 204 constituting the deformed portion, the re maining portions of the holddown plate being substantially identical with that hereinbefore de scribed, all of which are indicated with the addi tion of 190 to the reference characters. 15 In this modiñed form, the limits of outward travel of the ñyweights 'l0 are determined by of the cup is provided with an elongated aper bending the deformed portion 220 inward sub ture stantially as indicated, whereupon the ñyweight of sufficient dimension that the plate may be passed down over the cam 28, and thence moved sideways se that the skirt |04 will sub stantially embrace the centrifugal mechanism. A second elongated aperture |08 is also provided, and, along with the aperture |03 provide means such that the plate may be passed down over the end of the pivot posts 53, the spring posts 8d the connecting springs 86, and yet allow for clearance of the spring post 84 when rotative movement occurs between the weight base 62 30 and the cam bar '|8. Still other apertures as the arc like slots Il@ are provided that pass over the reduced threaded end | |2 of studs | l 4 secured at diainetric points on the weight base 62, thus providing means for holding the holddown plate iGE in spaced relation to the weight base 62, that the iiyweights may move radially without meet ing with obstruction. At appropriate points about the skirts or" the holddown plate, there are deformed portions |20 so positioned that when the holddown plate is assembled With the weight base, the tip ends |22 of the flyweights will en gage the deformed portions when the flyweights travel to their outer extreme, as illustrated in Fig. 7. i by the arrow B, the relation of the parts will then take the position illustrated in the dotted line showing of the holddown plate and flyweights. The relation of the deformed portions i and the stud receiving slots ||0, are such that rotation of the holddown plate with respect to the weight base will alter the point of engage ment between the deformed portion |20 and the tip of the ñyweight. Also the relation of the .52S is such that relative angular movement of the plates to one extreme permitted by the slots iid and studs lill there will be one point of engagement that will be nearer the axis of ro tation than when the two plates are at the other exfrcrne oi relative angular movement permitted by e and stud. Thus, the radial distance from the axis of the assembly to the point of engagement between the deformed portion and the tip oi‘ the rlyweight is lengthened or short cned depending on the position of the holddown plate and weight base. When the holddown plate and weight base have been moved to the de sire-d- relative position they may b-e secured in place by an appropriate nut | 24 tightened on the stud llfl. Fig. 8 is illustrative of the results that may be accomplished relative rotation of the hold down plate and the weight base. Arrow A indi cates that the holddown plate has been moved To upon 'the weight base the limit provided by the slot |55r and stud H4, the parts taking the posi tion illustrated in the full line position of the iig/weights. When the holddown plate has been moved to the opposite extreme provided by the slot liü and stud ||4, all of which is indicated lll is engaged by the tip |22 as shown in full lines, or the deformable portion 220 may be bent out wardly as indicated at 220a thus extending the range of outward movement as indicated by the dashed line position of the ñyweight 10. While the embodiment of the present inven 25 tion as herein disclosed, constitutes a preferred .1, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow. What is claimed is as follows: l. An ignition timer comprising in combina 30 tion, a circuit breaker, a cam for operating a circuit breaker, a driving shaft, means drivingly connecting the shaft with the cam comprising, a weight base secured to the shaft, a cam bar secured to the cam, a pair of studs provided by each of the bars and the weight base, flyweights pivotally mounted upon the studs of the weight base and having an arm engaging the cam bar, springs secured to a stud of each pair, and a 40 holddown plate superimposed over the cam bar and flyweights for guiding the outward move ment of the iiyweights, and means including a depending flange from the holddown plate lim iting the outward movement of the flyweights. 2. An ignition timer comprising in combination, a circuit breaker, a cam for operating a circuit breaker, a driving shaft, speed responsive mech anism drivingly connecting the shaft and cam, said speed responsive mechanism comprising, a weight base, flyweights pivotally secured to the weight base, a cam bar mounted on the circuit breaker cam, and normally urged to enga/ge the iiyweights, a holddown plate substantially en closing the cam bar and flyweights, and means provided by the holddown plate for limiting the outward movement of the iiyweights. 3. An ignition timer comprising in combination, a circuit breaker, a cam for operating a circuit breaker, a driving shaft, speed responsive mech GO anism drivingly connecting the shaft and cam, said speed responsive mechanism comprising, a. weight base, ilyweights pivotally secured to the weight base, a cam bar mounted on the circuit breaker cam, and normally urged to engage the flyweights, a shallow cup inverted over the fly weights and cam bar, means supporting the cup from the weight base in spaced relation with the said weights and bar, and means comprising a portion of the side wall of the cup for limiting 70 the outward movement of the flyweights. 4. An ignition timer comprising in combina tion, a circuit breaker, a cam for operating a clr cuit breaker, a driving shaft, speed responsive mechanism drivingly connecting the shaft and 75 _ 2,079,145 cam, said speed responsive mechanism compris ing, a weight base, iiyweights pivotally secured to the weight base, a cam bar mounted on the circuit breaker cam, and normally urged to engage the ñyweights, a plate member superimposed over but spaced from the cam bar and iiyweights, and de pending portions from the plate member disposed for engagement by the free ends of the flyweight thereby limiting the outward movement of the flyweights. one end of the shaft and providing a cam bar, spring posts mounted in each end of the cam bar, Ilyweights mounted on the pivot posts, and springs secured to the spring post and pivot post for maintaining the ñyweights in compact relation, a holddown plate apertured to fit over the cam, the studs and springs and permit their lateral movement, said holddown plate having provisions for limited rotation with respect to the weight base whereby the limits of outward flyweight close relation to the ñyweights and cam bar, means spacing the plate from the weight base and providing for limited rotation of the plate 15 with respect to the base, said plate having a de breaker in response to engine speed comprising in combination, a driving shaft, a support pro vided by the shaft and rotating therewith, ily weights pivoted upon said support, a cam bar secured to the cam and spring urged to normally engage the flyweights, and holddown means for guiding and limiting the movement of the fly weights, said holddown means comprising, a plate having apertures whereby the plate may be passed over the cam and the spring urging means main taining the flyweights in centralized position, means for securing the plate to the support in spaced relation with the flyweights, said securing means including arcuate slots in the plate dis posed over threaded studs on the support whereby the plate may be moved angularly relative to said support, and depending flat portions provided by the holddown means disposed at the outward 40 limit of flyweight travel whereby the flyweights are brought to rest at a predetermined point, the rotation of said plate relative to the support oper ating to change the radial distance at which the ñyweights come to rest. 45 8. In an ignition timer, a speed responsive mechanism comprising in combination, a shaft, a weight base mounted intermediate the ends of said shaft and provided with a pair of pivot posts, a cam mounted for oscillatable movement upon 5. The combination set forth in claim 1 wherein the holddown plate is apertured so as to pass over movement may be altered. 6. In a timer having a circuit breaker and an engine operated cam for actuating the circuit 20 breaker, the combination of means for altering the angular relation of the cam to the circuit 30 3 ’7. In a timer having a circuit breaker and an springs, and supporting post and be disposed in pending skirt substantially enclosing the weight base, and deformed portions in the depending skirt for limiting the outward throw of the fly weights. 20 9. The combination set forth in claim 8 in which the deformed portions of the skirt comprise flats angularly shiftable by the limited rotation of the plate relative to the weight base for alter ing the range of outward travel of the flyweights. 10. The combination set forth in claim 8 in which the deformed portions of the skirt com prise, bendable sections for varying the limitation of ilyweight travel. 11. The combination set forth in claim 8 in which the plate is apertured opposite the skirt deformations to weaken the skirt support, and wherein the skirt deformations may be bent toward or from the shaft for varying the extent of flyweight travel. 12. In a speed responsive mechanism for an ignition timer, wherein flyweights and a cooper able cam bar operate to effect an angular shift between a pair of coaxial shafts in response to variation in driven speed of one of the shafts, 40 holddown means and weight stops for the ñy weights, comprising in combination, a plate dis posed over the flyweights, skirt portions provided by the plate engageable by the weights at one extreme of their movement, thus limiting the out 45 engine operated cam for actuating the circuit breaker, the combina-tion of means for altering the angular relation of the cam to the circuit ward travel of the flyweights, and means defining the angular relation of the skirt portion with re breaker in response to engine speed comprising in 50 combination, a driving shaft, a support provided by the shaft and rotating therewith, fiyweights alterable so as to vary the extent of outward travel pivoted upon said support, a cam bar secured to the cam and spring urged to normally engage the rlyweights, and holddown means for guiding 55 and limiting the movement of the flyweights, said holddown means comprising, a sheet metal cup disposed over the ilyWeights and whose side walls depend over the support, said side walls providing flats disposed at the point of iiyweight engage 60 ment for limiting the outward movement of the flyweight. spect to the flyweights, said defining means being of the flyweights. 50 ' 13. In centrifugal means for an ignition timer, the combination comprising, a weight plate, fly weights carried by the weight plate, and a hold down plate secured in spaced relation to the weight plate for confining the movement of the 55 flyweights, said holddown plate having skirt por tions to be engaged by the ilyweights at one ex treme of their movement, and means for shifting the holddown plate relative to the weight plate for altering the extent of travel of the flyweights. JAMES L. ARTHUR.