Sept. 14 , 1926. B Dn A K I N G D E V I C . O C EFv?u.Done .IJCNHUm HL Mmœ dA .IR SM2. n œTI O ,.N E N G I N, A. m . l| E9 n, m W :W R. N 1,599,552 Patented Sept. 14, -1926. UNITED STATES PATENT oFElcE. » ‘ VALENTINE A. CHISHOLM, 0F SEATTLE, WASHINGTON. i BRAKING DEVICEI‘OB INTERNAL-COMBUSTION ENGINES. Application ñled June 21, 1924. Serial No.` 721,543. This invention relates to internal combus~ ever, the fuel induction pipe 18 is» formed tion engines for motor vehicles and more as shown in Figs. 3 and 4, to provide aside especially to improved means for converting opening 21 and a chamber 22 for a three an engine from a vehicle motor- into a4 ve way valve 23 which is utilized to admit into 00 hicle braking agency. ` . the manifold 20 _fuel from the carburcter and The object of the invention, generally, is air from the external atmosphere when the the provision of inexpensively constructed, valves are brought into approximately the conveniently controlled and efiicient devices position in which «they are represented in Figs. 3 and 4, respectively. for accomplishing the purposes above men 10 -,tioned. 24 represents an arm for the valve stem 231 Other objects and advantages will be set which is connected by a pin 25 to a control forth in the following specification. y l ng rod 26 whose other end is located with The invention consists inthe novel con in convenient reach of the automobile driver. struction, arrangement and combination of ' The braking function ofthe invention is 15 parts hereinafter described and claimed. attained' upon occasion by employing means In the accompanying drawings, for regulating the chain 14 to rotatively ad Figure 1 is an end elevation of an auto 20 25 vance the cam shaft 10 which governs the mobile engine with devices embodying my opening and closinfr movements of the engine invention a plied thereto. Fig. 2 is a side exhaust valves. lïiïith an Ottofour cycle elevation'oi) the same, part of the engine engine the advance above referred to of the being broken away. Figs. 3 and 4 are ver cam shaft is 1200, approximately. tical sectional views taken ylongitudinally of As embodied, said means comprises a the engine of a portion of a fuel and air three-arm spider which is journaled to a induction pipe for the intake manifold and stud 27 provided on the engine body, two illustrating' the controlling valve in its two of the spider arms 28 and 29 carry idler 75 80 operative positions. l pulleys 30 and 31, respectively. These arms ` . In said drawing the reference numeral 5 28 and'29 are disposed 'at lan angle of 90o represents in its entirety, a four-cycle in approximately from each other and are ar ternal combustion en ine of known or suit! ranged to have both of the pulleys engage- 85 se able construction havmg the usual cam actu able with the chain'within the space which ated intakepand exhaust valves,y not shown. 1s surrounded by said chain. The stems, 6 and 7, of such intake and ex . The third arm 32 of the spider is con-v haust valves are actuated to open in proper nec'ted by a rod 3,3 with an arm 34 of a bell sequence the respective valves in opposition crank lever which is fulcrumed to a rela 90 35 to valve closing springs such as 8, tively fixed stud 35. The other arm 36 of The cams for effecting the opening move said lever being connected by a rod 37 with ments of the intake and exhaust valves are the pin 25 so as to be actuated by the auto rigidly mounted upon shaftsl 9 and 10 re mobile driver through the medium lof the ~ spectively. The cam shaft 9 for the intake controlling rod 26. 40 valves- is driven from the 'engine crank shaft 95 Normally, or when the engine is working- _11 through the medium of spur gears 12 as a motor, said spider occupies the osition and 13 having a gear ratio of one to two in whichit is represented by full ines in whereby the cam shaft is rotated at one-half Fig. 1 with the lower lead of the chain de the speed of the >engine shaft. _ ?lected downwardly by means of the wheel 45 The cam shaft 10 for the exhaust valveslis 30, the other wheel 31 being idle. When 100 rotated at the same speed as the cam shaft the spider is brought into its dotted line posi 9 for the intake valves by means of an end tion, Fig. 1, the wheel`30 becomes idle andA less chain 1'4 passing about sprocket wheels the other wheel 31 is swung into its dotted 15.and 16 ri idly mounted upon the respec line 311 position resulting in the upper lead 105 6 tive cam sha s. . .A ’ of the chainbeing deflected u wardly as 17 represents the engine exhaust pipe and indicated by dotted lines 141, gi . 1. As 18 is the induction pipe extending rom the this occurs, the slack, so to speak, o the lower carbureter 19 to the intake manifold 20.' y Y ’ lead is caused to ass .about the sprocket wheel The parts hereinbefore described are or 16 resulting in t e advancing 120°, approxi :.5 ma be constructed as hitherto. -4 mately, the cam shaft 10 which, in turn, ccordingto the present invention, how regulates. the exhaust valves to Cause the 1,599,552 2. same to be open during the second down gears operatively connecting the crank shaft strokes of the pistons of the engine. - The with said cam shaft for driving the latter, of strokes above referred to correspond to the a cam shaft for-the exhaust valves, sprocket ‘ i, explosive strokes when the engine is utilized wheels provided on the respective cam 60 as a motor. It is to be understood, how shafts, an endless chain taking with said ever, that the times and sequencel of the open sprocket wheels for transmitting rotary mo ing and closing of the inlet valves are in tion from one cam shaft to the other, and no way affected by the present invention, Imeans for regulating said ch°ain whereby and the periods of action of. the exhaust the rotary motion of the cam shaft-of the 10 valves are such that the air drawn into the exhaust valves is advanced and retarded se 15 cylinders during the respective suction lectively with respect to the other shaft. strokes of the engine. is trapped within the In an internal combustion engine, the cylinders and constitutes a retarding agent -_ combination with the cam shafts for the in for reducing the speed of the engine and also »let and exhaust valves, toothed gears operated the speed of the car when the transmission l.by the enginecrank shaft to drive the inlet is in gear. ' valve cam shaft, means ~including an end The occurrences of the open and closed' periods of the exhaust valves are thus ¿ad v,justalole' relatively to the action ofthe cam~ shaft 9 which controls the inlet valves. less chain for transmitting rotary motion yfrom the intake valve cam-shaft to the other cam shaft, and means afor deflecting the 70 75 leads selectively of said chain to effect an The changes in the positions of; the spider angular movement to the exhaust-valve cam are controlled .by the rod 26'Whicl1 likewise shaît independently ofthe intake-valve cam controls the’action of the three-way valve sha t. 23 so that the latter is held in position (Fig. » 4. In an internal combustion engine, Vin 3) to afford a supply of fuel to the engine combination, a regulating valve for admit when it is operating as a motor, but when ting air and fuel selectively into the Vfuel the spider is regulated to cause the engine intake, means to drive the engine intake to operate as a brake, the valve 23 is moved valve 'cam shaft, transmission means con 30 into a position (Fig. 4) to shut off the fuel ---necting said cam shaft with the cam shaft supply and admit .air into the. cylinderssub of the exhaust valves, and means operatively as ject to regulation by ,the engine intake connected with said regulating valves for . adjusting said transmission means> for ro valves. The operation of the invention will, it tatively advancing 120° approximately theÀ 85 is thought, be understood from the forego lastnamed cam shaft coincidently' with the ing description. It Will be understood that setting of said regulating valve for the pas 90 changes may be made from the precise forms . sage of air into and from the fuel intake. of the devices herein shown and described, _i A5. In an internal combustion engine, the -»within thé-_ scope of the accompanying combination with a fuel intake having an claims, without departing" from the prin opening to the external atmosphere, -and af ciples of the invention and without sacri three-wa -valve for admitting atmospheric ficing its advanta es. _ air and> 'el selectively into the, fuel intake, What I claim, 1s:- , ~ of a power driven inlet-valve cam-shaft, an 1.' In aninternal combustion engine, the exhaust-valve cam-shaft, chain devices for combination with the cam shafts for actuat transmitting _motion from the first to the ing the stems of the intake and exhaust valves for effecting the opening movements of the respective valves, means to drive the intake valve cam shaft, and transmission;v second named cam-shaft, a spider for regu-lating said chain devices to impart an angu-. lar movement to the _second named -shaft independently of the other shaft, and means.. Ameans for drivingl the exhaust cam shaft for adjusting said spider, Vsaid`last'~-namîsd from the intake `cam shaft, of> means for means being connected Ato said- three-way. regulating said transmission means for ad valve whereby the latter is actuated witlf' vancing” the rotation of the exhaust cam the adjusting of the spider. , ' e ,_ shaft relatively to the intake cam shaft; Signed at Seattle, Washington, th1s 9th. 2. In an internal combustion engine, the day of June’1'924. ` ' combination with’the engine crankshaft, a Vcam shaft for the intake valves, and a train of VALENTINE A. cHrsHoLM. ' los ’
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