US2096294A

US2096294A - Automatic ignition timer for internal combustion motors

Info

Publication number: US2096294A
Application number: US753236A
Authority: US
Inventors: Thomas W Bryant
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-11-15
Filing date: 1934-11-15
Publication date: 1937-10-19
Anticipated expiration: 1954-10-19

Description

Oct. 19, 1937. T, w BRYANT 2,096,294

AUTOMATIC IGNITION TIMER FOR INTERNAL COMBUSTION MOTORS Original Filed NOV. 15, 1934 2 Sheets-Sheet 1 I I l 7770mm Mfirymr INV NTOR TTORNEY Oct. 19, 1937. T, w, BRYANT 2,096,294

AUTOMATIC IGNITION TIMER FOR INTERNAL COMBUSTION MOTORS Original Filed Nov. 15, 1934 2 Sheets-Sheet 2 "0 78 g 5 5 1 77 7.9 Q i I 08/ 79 1 66 6.9 65 l 67 Thomas 14 BW Z I 1N vE 'TOR 66 BY A QRNEY Patented Oct. 19, 1937 UNITED STATES PATENT OFFICE AUTOMATIC IGNITION TIMER FOB INTER- NAL COMBUSTION MOTORS Thomas W. Bryant, Denver, Colo.

Claims.

This invention relates to ignition timers for internal combustion engines and more particularly to automatic means for controlling the spark and it consists in the constructions, ar-

5 rangements and combinations herein described and claimed.

It is an object of the invention to provide a timer construction embodying means for automatically regulating the intensity of the spark in accordance with motor speeds.

A still further object of the invention is to provide a novel construction of cam for efiecting the make and break in a primary circuit producing a current through the primary winding of a 1:, transformer coil, the loading and unloading of which is controlled through the action of the cam, thus establishing a secondary current in the secondary winding, which in turn, as the circuit is broken, effects a high tension spark of even intensity throughout varying speeds of the engine. I

It is a still further object of the invention to provide a novel governor mechanism for eiIecting actuation of the cam member.

A further object of the invention is the provision of a novel construction of rotor and distributor head, as well as a novel construction of rubbing block.

A still further object of the invention is the provision of automatic means, cooperable with the governor for starting an internal combustion engine.

Additional objects, advantages and features of invention will be apparent from the following description and accompanying drawings, wherein Figure 1 is a vertical section through an ignition timer illustrating my invention, showing the automatic starting mechanism graphically.

Figure 2 is a cross section on the line 2-2 of Figure 1. a

Figure 3 is a cross section on the line 33 of Figure 1.

Figure 4 is a fragmentary sectional view through a portion of the timer illustrating an adjustable stop means for the cam.

Figure 5 is a vertical section through a modified form of the timer head and rotor.

Figure 6 is a top plan view of one of the breaker arms illustrating the rubbing block.

Figure 'l is a side elevation of the cam.

It is generally understood by those versed in the art that the electric ignition of engines of motor vehicles is timed and controlled by the rotation of the engine shaft, and that there is a shorter duration of the ignition contact when the engine shaft is moving at a high speed than when the engine is operating slowly. Obviously, this is a disadvantage for if the ignition is timed for slow speeds, it is inadequate for high speeds. There is more need for efllcient spark at high speeds than at low speeds, for the reason that a greater amount of gas is being supplied to the engine and the latter is operating under higher compression.

In carrying out my invention I overcome this 10 defect in the provision of a cam and centrifugally operated mechanism so coordinated that the closed period of the induction coil remains constant throughout the varying speeds of the engine. 15

There is illustrated generally, a timer I0 which comprises a cylindrical casing ll upon which a head I2 is detachably connected by means of swinging hooks [3. Within the casing II a plate i4 is mounted, centrally apertured and bossed, as at l5, and immediately above this plate there is an assembly plate [6. The plate l6 has a pair of upstanding ears I1 and 18. To the ear I! a bus bar I9 is fixed and aflixed to the ear l8 there is a bus bar 20. The bus bar I9 is electrically connected to a stud 2| of the casing Ii, as indicated at 22, and the bus bar 20 is in circuit with the stud 21 by virtue of a conductor 23.

A condenser 24 is carried by the casing H, exteriorly thereof and is connected to the stud 2| by the conductor 25, a source of energy being supplied to the stud and condenser through a primary conductor 25.

Attention is particularly invited to Figure 2 of the drawings, wherein it may be clearly seen that the plate I6 is provided with a central aperture 21 and upon opposite sides thereof, there is mounted a pair of breaker arm assemblies 28. The assemblies 28 are identical in construction and comprise a mounting plate 29, slotted as at 30 for reception of screws 3i which are threadedly engaged with the plate It. Breaker arms 3233 are pivotally mounted upon the plates 29, as at 3!, and each arm is tensioned by a spring 35-46. The spring 35 is anchored to the bus bar 19 at 31, and the spring 36 is anchored to the bar 20, as at 38. Each breaker arm 32-33 includes a breaker point 39 operatively related to a breaker point 40.

A shaft 4| is revolubly mounted in a bushing 50 42 of the casing, the outer end 43 of which is provided with any suitable means for establishing a driving connection. The inner end of the shaft ll extends inwardly of the casing a. substantial distance and terminates in a reduced stud ll. 55

respect to the bushing 42 asize posed slots 4'! are cut in the sleeve 45, extending shaft 4| have their opposite ends confined within respective slots of the sleeve. By the construc-- tion it will be apparent that rotated by the shaft 4!, and yet the sleeve may move longitudinally upon the shaft, the function of which will be more readily understood as the description proceeds.

The sleeve 45 is interiorly threaded as at 49, and receives a screw plug 50 therein and by adjusting the plug 50 inwardly or outwardly, the tension of the helical spring 5| may be varied. The spring it will be noted is housed within the sleeve, seated upon the stud 44 and in bearing relation with the plug 50. A collar 52 is fixed to the shaft 4| by a pin 53, and this collar is so located upon the shaft with that lengthwise movement of the shaft is prevented. A collar 54 is fixed to the sleeve 45 in any suitable manner, pins 55 being employed in the present instance, and each of these

collars

52 and 54 are provided with

ears

56 and 51 respectively, arranged in opposition to each other. A helical spring 58 is interposed between the

collars

52 and 54 and any tendency of the collar 54 to move toward the collar 52 will be resiliently opposed by the springs.

It should be noted that the spring 58 does not contact the collar 54, in the normal position of the parts, but is spaced therefrom, and onlyfunctions at the higher speeds, which is permitted only after compression of the smaller spring 5|.

A link 59 is pivoted to each of the ears 5! and a pair of links 60 are pivotally mounted to the ears 56. The

links

59 and 60 are apertured, and the links 60 receive a link 59 therebetween with apertures aligned and over the links thus assembled, ears 6| of respective weight members 62 are positioned. The ears 6| are apertured and aligned with apertures of the links and a pin 63 extended through aligned apertures secures the preferably at such angle as to rest upon the links 6|! a substantial distance below the pivotal connections between the links 59-59, thereby tending to maintain the links in vertical extended position. The aforementioned structure constitutes a centrifugal governor.

The upper end of the sleeve 45 is preferably provided with a series of longitudinally extending slots 65 and the interior of the sleeve is threaded to receive a tapered threaded plug 66 (see Fig. 5). A cam fills disposed upon the sleeve 45 and rests upon the shoulder 68 of the sleeve, and it will be apparent from the foregoing that upon expansion of the sleeve by manipulation of the plug 66 the cam will be rigidly fixed to the sleeve.

The upper end of the cam has a flattened portion as customary, and has mounted thereon a rotor 59. The rotor comprises a disk 10 upon the upper face of which there is fixed a conductor arm 1|. This arm extends from the medial portion of the disk to one side, stopping short of contact members 12 mounted in the head l2. The contact members are rigidly molded within the head E2, the members 'lzextendinga substantial distance downwardly along the inner wall of the head, all of which is clearly shown in Figure 1. It is essential that the contact members 12 have a device, the rotor the sleeve 45 will be similar substantial lengthsince the operation of it? will -travel upwardly an downwardly within the head 82, and during sucl raveL'the contact members and the arm I! mus hav such relationship as to transmitithe elec longitudinally thereof, and .a pin-48 fixed in the trical energy necessaryfor the operation of th' device. Thecontaotmembers 72 terminate i1 usual clip sockets '33 for connection of spark plug terminals (not shown). The cap l2 also include: a socket 14 for connection of a high tension leac (not shown) as is customary. The socket 14 i: centrally disposed within the cap l2 and has a bore 15 opening in the direction of the rotor 10 and within the bore 15 there is seated a brush 76. The brush 15 is hollow for a portion of its length, thejopen end thereof being disposed toward the base of the bore 15, and a helical spring 11 is housed within the hollow arm H regardless of the longitudinal movements of the rotor.

From the foregoing description of the invention thus far it will be apparent that as the shaft movement to the cam 67; the cam being governed by the speed of the engine, the cam in turn controlling the breaker arm assembly 28.

The cam 61 comprises, in the present instance, four lands 78, separated by cam faces 19. The cam 61 is of cylindrical shape, and adjacent its upper end a circumscribing ring is formed, from which the cam faces 19 extend, the leading edge 8| of which is formed at an angle which will vary according to the particular construction of When a motor vehicle is to be maintained at a predetermined maximum speed, the cover plate is removed from the casing In so that access may behad to the governor, and the cap I2 is likewise removed from the casing Ill. The lock nut 86 of the stop bolt 81 is loosened so that the bolt may be readily adjusted by means of a wrench. Then a downward pressure upon the rotor 10 will move the sleeve 45 toward the collar 52, which obthe actuation of viously tensions the'spring 5|. The sleeve 45 is moved downwardly until the boss 46 thereof encounters the end of the stop bolt 81. The bolt 51 is then adjusted so that at the maximum speed of the engine the boss will encounter the bolt, thereby preventing further downward movement of the sleeve 45. Since the high speeds of the vehicle will necessitate the movement of the sleeve to its lowermost positions, limiting such movement will necessarily limit the speed of the engine. The ring at of the cam would at speeds above the maximum be encountered by the fiber blocks 84 due to downward movement of the cam and since the ring is devoid of any cam action, the breaker assemblies would be inoperative, but as the speed of the engine diminishes, the cam 51 rises upwardly, again bringing the cam faces into alignment with the breaker assemblies.

It is important to note that during operation of the governor as the weights 62 swing outwardly at the lower speeds of the engine, the spring 5| first opposes the downward movement of the sleeve 45, but as the speed of the engine is accelerated, the resistance offered by the spring is overcome and the collar 54 then moves into engagement with the heavier spring 58. Thus, there is provided a drive between the governor and cam which is highly sensitive to varying speed changes, and reduces governor lag to an appreciable extent.

The theory of operation of induction coils is so well understood by those versed in the art that a lengthy discussion here is not thought necessary to the understanding of the present invention, but it may be pointed out that the quicker the break of the contacts 39-40, as the speed of the engine increases, a stronger spark is created at the spark plugs of the engine, and any tendency of weakening of the spark is offset by the varying area of the Y faces of the cam, the duration of contact at the timer increasing or decreasing, in direct ratio to the speed of the engine. so that the breaking of the primary circuit occurs at all speeds at the peak of the coil.

In Figure 5 a modification of the rotor is shown, in which the arm I la is provided with an integral arm 88, extended in a plane parallel with the contact members 12a, and the latter are also provided with a lateral projection 89 extended into proximity of the arm Ila. By such arrangement it will be apparent that throughout the varying longitudinal movements of the rotor, the arm 1 la will always be in such position as to establish the required electrical circuit. The present construction provides for a more compact structure, since the arms 12a may be made considerably shorter than in the first described form.

The present distributer is well suited for installation of an automatic starter for an engine equipped therewith, and in Figure 1 I have illustrated a preferred construction of starting mechanism, as will now be described.

Upon the plate [4 a pair of ears 90 are formed, between which an arm 9| is rockably mounted, as at 92, one end 93 of the arm being disposed in the path of and adapted to be engaged by a flange 94 of the collar 54. The other end 95 of the arm is extended through a slot 95 of the casing I l, and is resiliently anchored by a spring 91. A contact 98 is mounted upon the casing H immediately beneath the end 95 of the arm, and functions in conjunction with the arm to close an electrical circuit to a starting motor, as will presently appear.

A starting motor 99 is shown, which includes a switch I in circuit with a storage battery HH, and a solenoid I02 is so related to the switch I" that upon energizatlon of the solenoid the switch will be moved to close the circuit to the motor which in turn will cause a cranking of the engine. The solenoid I42 is electrically connected to the contact 9! by a lead I03 and is also in circuit with the battery Ill through the lead I04 of the ignition circuit.

Thus, as soon as the engine ceases to function, the governor likewise comes to rest, causing the flange 94 to engage the portion 93 of the arm, giving it an upward movement, causing the opposite end 95 to move into engagement with the contact 98, against the action of the spring 91. When thearm 9| and the contact iii are thus engaged the circuit to the solenoid will have been completed, causing actuation of the switch III. of the starting motor. As soon as the engine has been started, the governor will have drawn the flange 94 away from the end 53 of the arm and the spring 91 will break the circuit with the contact 98, thereby de-energizing the solenoid. Preferably a key actuated switch I controls the circuit to the ignition and starting motor although separate ignition and starting motor switctlzhes may be installed in the circuits, if desire While I have shown and described preferred embodiments of the invention I am aware that modifications may be made, and I therefore consider as my own all such variations in construction as fairly fall within the scope of the ap pended claims.

I claim:

1. In an ignition timer for internal combustion engines, a casing, a cap therefor, a plurality of I conductors in the cap extending longitudinally thereof and exposed upon the inner wall of the cap, a shaft revolubly mounted within the casing, a sleeve longitudinally movable upon the shaft and rotatable therewith, spring means opposing movement of the sleeve toward the shaft, a collar fixed to the sleeve, a collar fixed tothe shaft, said collars being in opposed relation, link members connecting the collars, a weight member pivotally mounted upon the links, a helical spring interposed between the collars and adapted to be compressed between the collars after compression of the first named spring, a cam member on the sleeve having elongated cam faces, the fall edge of which is flared away from the leading edge thereof to provide cam faces of increasing area toward the base of the cam, breaker members operatively related to the cam faces, a rotor on the sleeve, said rotor having an arm stopping short of the conductors within the cap and said rotor and cam having longitudinal and rotary movements coincident with rotary and longitudinal movements of the sleeve.

2. In an ignition timer for internal combustion engines, a cap therefor, a plurality of conductors in the cap extending longitudinally thereof and exposed upon the inner wall of the cap, a shaft revolubly mounted within the casing, a sleeve telescopically arranged upon the shaft, said sleeve having opposed longitudinally'extended slots, 8. pin in the shaft having an end thereof disposed in respective slots, said sleeve being interiorly threaded adjacent the outer end, a helical spring within the sleeve and seated upon the end of the shaft disposed within the sleeve, a screw threaded plug engaged with the threaded portion of the sleeve and in bearing relation with the spring, a collar fixed to the sleeve, a collar fixed to the shaft, said collars being in opposed relation, link members connecting the collars, a weight memher pivotally mounted upon the links whereby rotation of the shaft will cause movements of the sleeve toward the shaft against the action of the spring, a spring interposed between the collars, said spring being of greater strength than the first named spring and adapted to be compressed between the collars after compression of the first named spring, a cam member on the sleeve having elongated cam faces, the fall edge of which is fiared away from the leading edge thereof to provide cam faces of increasing area toward the base of the cam, breaker members operatively related to the cam faces, a rotor on the sleeve, said rotor having an arm stopping short of the conductors within the cap, and said rotor and cam' having longitudinal and rotary movements coincident with rotary andlongitudinal movements of the sleeve. I

3. In an ignition timer for internal combustion engines, a casing, a cap therefor, a plurality of conductors in the cap extending longitudinally thereof and exposed upon the inner wall of the cap, a shaft revolubly mounted within the easing, a sleeve longitudinally movable upon the shaft and rotatable therewith, spring means opposing movement of the sleeve toward the shaft, adjustable means for limiting downward movement of the sleeve, a collar fixed to the sleeve, a collar fixed to the shaft, said collars being in opposed relation, link members connecting the collars, a weight member pivotally mounted upon the links, a helical spring interposed between the collars and adapted to be compressed therebetween after compression of the first named spring, a cam member on the sleeve having elongated cam faces, a fall edge of which is fiared away from the leading edge thereof to provide cam faces of increasing area toward the base of the cam, breaker members operatively related to the cam faces, a rotor on the sleeve, said rotor having an arm stopping short of the conductors within the cap, and said rotor and cam having longitudinal and rotary movements coincident with rotary and longitudinal movements of the sleeve.

4. In an ignition timer for internal combustion engines, a casing, a cap therefor, a pluwithin the casing,

rality of conductors in the cap exposed upon the inner wall thereof, a shaft revolubly mounted a sleeve longitudinally movable upon the shaft and rotatable therewith, spring means within the sleeve opposing movement of the sleeve toward the shaft, a collar fixed to the sleeve, a collar fixed to the shaft, the collars being arranged in opposed relation, link members connecting the collars, a weight member pivotally mounted upon the links, a helical spring interposed between the collars and adapted to be compressed therebetween after compression of the spring first named, a cam member on the sleeve having elongated cam faces, said cam faces merging with a circumferential ring presenting an uninterrupted surface at their junctures, breaker members operatively related to the cam faces, a rotor on the sleeve, said rotor having an arm stopping short of the conductors within the cap, said rotor and cam having longitudinal and rotary movements coincident with rotary and longitudinal movements of the sleeve, and a set screw in the collar upon the shaft adjustable inwardly and outwardly in the direction of movement of the sleeve.

5. In an ignition timer for internal combustion engines, a casing and cap member, a rotary shaft in the casing, a sleeve rotatable therewith and having longitudinal movements, spring means opposing longitudinal movement in one direction, link means connected between the shaft and sleeve, centrifugally actuated means associated with the links tending to draw the sleeve against the action of the spring, spring means opposing such movement, a rotor on the sleeve, said rotor having cam faces extending longitudinally thereon, and having a circumscribing ring portion adjacent one end thereof, said cam faces merging with the ring to present a smooth uninterrupted surface, breaker members operatively associated with the cam faces, an arm on the rotor operatively related with contacts in the cap, and adjustable means in the path ofthe sleeve whereby the length of movement of the sleeve may be varied.

THOMAS W. BRYANT.