US1733943A - Ignition timer - Google Patents

Description

W. A. CHRYST IGNITION TIMER Filed Jan. 13, 1928 gmw ' Patented Oct. 29, 1929 UNITED STATES P ENT; orrlca mun: A. crmYsr. or DAYTON, 0310, nssrenon r nnnco-nnmr'co or DAYTON, onro, A coarom'rron or DELAWARE IGNITION TmEB Application filed January 1a, 1928. serial No. 246,640

This invention relates to ignition appara- I tus for internal combustion engines, and

' ing shaft which is journalled upon a portion of thetimer driving shaft so that it may be rotated relative thereto, and I connect the shafts by a mechanism which'can be confined within the timer housing and which includes The ignition timer housing is provided 7 with a tubular shank 21- which bearing for the timer driving sha 22 which is provided with a C-washer 23 resting upon a round washer 24 which in turn rests upon 55 the bottom of a recess 25 provided in a boss 26 ofthe timer housing 20. Thus the shaft 22 is rotatably supported by the housing and is prevented from moving downwardly through the shank 21.

a cam carrying shaft 28 providing a timer cam 29. Tlie shaft 27 is supported verticall by resting upon the collar 23 and the sha t 28 is supported vertically by resting upon a 65 shoulder 30 provided by the shaft 22. The shaft 28 supports" and drives a rotor block 31 BPOBATION, f

fprovides' a t The shaft 22 provides oo. bearings for an intermediate shaft 27 and for the conventional metal bellows providing a pressure chamber which is connected with the intake passage of the engine. The bellows is located preferably parallel to the timer driving shaft and along one side thereof and carrying a conducting segment 32 which "00-' operates with distributor posts 33 carried by a distributor head 34 which is clamped'upon 7 the housing 20 in any suitable manner, not shown.. The segment 32 is connected with controls a member which moves along the shaft and is so connected with the driving shaft and cam carrying shaft as to chan e the angular relation between these shafts in response to the expanding or collapsing of I the bellows.

Further objects and advantages of the present invention will be a parent from the following description, re erence being bad to the accompanying drawings. wherein a preferred form of embodiment of the present invention is clearly shown.

In the drawings:

Fig. 1 is in part a-vertical sectional view of an ignition timer embodying the present invention and in part a diagram showing the.

manner of connecting the suction chamber of the ignition timer with the engine intake passage. v

Fig. 2 is a plan view of the timer with the distributor head removed.

Fig. 3 is a fragmentary sectional view of certain parts shown ill'Flg. 1 but this figure shows the parts in diflere'nt positions.

Fig. 4 is a sectional view on the line 4-4 of Fig. 1.

Fig. 5 is a fragmentary view looking in the direction of the arrow 5 of Fig.1. 1

plate 45 by screw46 a leaf spring conductor 35 carrying abutton 36 which engages a button 37 carried by the center metallic terminal receiving socket 38. 5

a movable contact 42 carried by the lever 41 from a stationary contact 43 attached to a 80w bracket 44 adjustably secured to a breaker passing through an arcuate slot 47 The lever 41 and the bracket 44 are concentrically pivoted around a pivot stud 48 attached to the plate 45. A leaf 85 spring conductor 49 conducts current from the terminal bracket 50 to the lever 41 and also urges the lever toward the cam 29. The terminal bracket 50 is insulatingly supported by the plate 45 and is connected witha terminal screw 51 insulated from the housing 20. A wire 52 connects the bracket 50'With the insulated foil of a condenser located within a case 53 to which one of the foils is grounded the case being grounded to the ignition timer 5 throughthe bracket 54 soldered to the'case,

53 and fastened by a screw 55 to the plate 45.

The means for connecting the intermediate shaft 27 with the cam carrying shaft 28 comprises a weight supporting plate fas-Y toned at the upper end of the shaft 27 and en porting a plurality of weights 61 which are pivoted around the studs 62 attached to the weight plate. Each weight 61 is provided wlth an arm 63 for engaging an arm provided by plate 64 attached to the lower end of the shaft28. As the weights 61 move away from the shaft 28 in response to increase of speed,thearms 63 will cooperate with the plate 64 so as to rotate the shaft 28 clockwise relative to the shaft; 27 and thus advance the timing of the ignition, the normal direction of rotation of the cam 29 being clockwise. As the s eed of the'shaft washer In 71 extendin radially through oblique slots 72 in the s eeve 27 and into longitw the washer 70 is moved along the shaft 22,.

'dinally slots 73 which are rovided in the shaft 22 and extend from t e C-washer23 through the shoulder :30. Obviously when the angular relation between the shafts 22 and 27 will be varied. The washer 70 is i moved vertically as viewed in the drawings,

by a plate 74 which is provided with arms,

7 5. located on either side of the shaft 27 and provided with/longitudinal slots for receivmg edgeportions of the washer 70. The

late 74 is attached to the bottom of a metal ellows 76, the-to of which is secured. to a horizontal wall 7% extending from a cover plate 78 which encloses an opening formed in one side of the housing 20 and is secured to the housing by screws 79. The plate 74 is guided in its vertical movements relative to the wall 77 by telescopically engaging sleeve members 80 and 81, the former being integral with a plug'82 which is screwed into the threaded opening in the plate 74,

'and the latter being integral with the horizontal wall 77. These sleeves retain a spring '83 which yieldingly urges the plate 74 downwardly into engagement with a stop plate 84 which is attached by screws 85 to the cover 78-. The suction chamber provided within the bellows 76 is connected by a hole 91 withthe interior of the sleeve 83 and the sleeve'83 is connected by a passage 92 in the cover 78 with an elbow pipe 93. Fig. 1 diagrammatically shows apipe 94 connectin the elbow 93 with a pas- 95 whic is provided by a carburetor 96 attached to an engineintake manifold 97.

I The butterflythrottle valve 98 of the carbure is supported by a 99 operated by a .lever 100 and a link 101, The passage 95 is below the edge of the valve 98 when the valve is in idling position. q

The suction in he engine intake between the engine and the throttle will be greatest when the .engine speed is greatestand the throttle is partly closed corresponding to conditions driving an automobile at a relativelyhigh speed over a relatively level road. The increase in suction or sub-atmospheric pressure in theintake 97 will result in'the more or less collapsing of the bellows 76 as viewed in Fig. 3. The washer 70 will therefore move upwardly to cause the shaft 27 to rotate in a clockwise direction relative to the shaft 22. Therefore the cam 29'will be rotated in a clockwise direction relative to the shaft 22 and the timing of theignition will b advanced. If the load on the engine shou (1 increase requiring the throttle 98 to" be opened the suction in the i take 97 will decrease and the spring 83 will be permitted to expand to cause the late 74 to move away from the wall 77, therehy moving the washer 70 downwardly to rotate the shaft 27 counterclockwise relative to the shaft'22 and to retard the timing of the ignition.-

The housing 20 rovides a horizontal ledge 110 providing a Bee receiving a ad 113 of fibrous material which ring 111 for the'shaft 27. The ledge 110 provides a pocket 112 for 05 pipe 114 and dispensed through a passage 115. Some of this oil will find its way down the shaft through the grooves 72 to the outer surface of the shaft 22' and in the grooves. 73 in order that the contacting surfaces be-. tween the shafts 22 and 27 may be lubricated and also the surfaces of the grooves which, I

are engaged by the tangs 71 of the washer'70.

In assembling the apparatus the Washer 70' is first placed within the housing and is located between the shank 21 and the ledge 110 and in alignment with the bearings rovided by these parts. Then the shaft 22 1s moved upwardl through the shank 21 and its grooves 3 are positioned so as to receive the tangs 71 of the washer 70. The shaft 22 ismoved upwardly through the bearing 111 until the groove 23 is located above the boss 26. Then the C-washer 23 is placed in the groove 23 and the shaft 22 is lowered until the washer 23 rests upon the washer 24. Then the shaft 27 is moved downwardly along the shaft '22 and is passed througlf the bearing 111 and is 50' positioned that its grooves 72 will receive the 'tangs 71 of the washer 70. Then the cam carrying shaft 28 is assembled on'the shaft 22 and the springs 65 are con-- nected with the studs 62 and 66. Following this the breaker plate with the parts attached thereto is mounted within the timer housing 20-. Then the distributor rotor and lthe head are assembled in the usual manner. The cover 78 carrying the mechanism for shifting the wardly it will be resisted by the plate 64 which rests upon the weight plate and upward movement of the plate 64 will be resisted by the engagement of the collar 116 with the plate 45.

The maintenance of the apparatus in operative condition is facilitated by a construction which permits removal of the suction operated mechanism for shifting the collar 70 without requiring other parts of the timer to be disassembled. After disconnecting the pipe 94 from the plate 7 8 and after removing the screws 7 9, the plate 7 8 and mechanism supported thereby for shifting the collar 7 0 may be removed as a unit for repairs or re placements without disturbing the speed responsive mechanism for connecting the cam with the drive shaft of the timer. After removing the distributor head 34 and the interrupter carried by the breaker plate 45, the cam carrying shaft 28, the intermediate shaft 27, and the speed responsive means connecting the shafts 28 and 27 may be removed as a unitary assembly without disturbing the other mechanism for shifting the collar 70.

While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

Vhat is claimed is as follows:

1. Ignition apparatus for internal combustion engines comprising, in combination, an interru ter, a drive shaft, a cam for operating the interrupter journalled upon the drive shaft, a driven shaft connected with the cam, and means for connecting the shafts and for yarying the angular relation between them in response to variations in engine intake'suction and including a suction chamber provided by a metal bellows, one end wall of which is movable longitudinally of the shaft,

a collar movable along the shafts and so connected with them as to change their angular relation as the collar is moved, and means transmitting motion from the movable end wall of the bellows to the collar.

2. Ignition apparatus according to claim 1 in which the apparatus has a housing provided with an opening in a wall thereof, and

r in whichthe cover for the opening supports the bellows.

3. Ignition apparatus according to claim 1 in which the apparatus has a housing provided with an opening in a wall thereof, and

in which a unitary sub-assembly covers the opening and includes the bellows and the means or transmitting motion from the movable end wall of the bellows to the collar, the sub-assembly being removable from the housing while the collar remains assembled with the shafts.

4. Ignition apparatus for internal combustion engines comprising, in combination, an interrupter, a cam for operating the interrupter, a drive shaft, a driven shaft connected with the cam, said cam and driven shaft being journalled upon said drive shaft, a collar movable along the shafts and so connected with them that one will be rotated relative to the other as the collar is moved, means responsive to variations in engine intake suction for moving the collar and comprising a suction chamber provided by a metal bellows located substantially parallel to the drive shaft, and a plateattached to an end wall of the bellows and connected with the collar so as to move the same along the shaft while permitting rotation of the collar.

5. Ignition apparatus for internal combustion engines comprising, in combination, an

ment of the collar along these shafts will cause one of them to rotate relative to the other, the intermediate shaft, cam-carrying shaft and speed responsive device being removable while assembled from the apparatus leaving the collar assembled with the drive shaft, and a device responsive to variations in engine intake suction for moving the collar, said device comprising a removable plate attached to the apparatus, a metal bellows attached at one end to the plate, and a movable plate attached to the free endof thebellows and connected with the collar so as to move the same along the shaft while permitting rotation of the collar.

In testimony whereof I hereto afiix my signature.

WILLIAM A. CHRYST.

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