US1581917A - Best available cop - Google Patents

Description

BEST AVAILABLE COP.

April 20, 1926. 1,581,917

C. O. BRUNO TIMER FOR INTERNAL COMBUSTION ENGINES Filed July 2 1920 z k 14 I 20' :0 2 5 I 153.2 1 I l I B c HINVENTOR. A w "10 0.0.Bruna '1 I I l I I Patented Apr. 20, 1926.

UNITED STATES BEST AVAlLABLE. COP.

1,581,917 PATENT" OFFICE.

CARL O. BRUNO, OF LOS AN GELES, CALIFORNIA, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO -BIGELOW-IBRUNO MANUFACTURING COMPANY, OF CHICAGO,

ILL'INoIs, A oonronn'rron or ILLINOIS.

TIMER FOR INTERNAL-COIEBUSTIOIV ENGINES.

Application aied'nii e,

This invention relates totuners forin- 10 ternal combustion engines of thejtypemounted upon the end of a cam shaft and arranged adjacent the fan belt and fan of theengine. In timers of this character 'as now generally constructed a terminal is provided for 1 sep rate wires leading to the spark plugs of the respective cylinders of the engine, said terminals being equally spacedja round theperiphery of the timer. By this arrangeinent'in a timer employed in connection with 2 a four cylinderengine two otsaid terminals are at the sideof the timer adjacent thetan belt of the engine and in a position where they are not readily accessible The wires leading to these two terininalsfarlsubjected 2 to 'dirnwater and oil thrown b'y the izin belt so that much difiicultyhas been experienced through the rotting and wearing of the insulation offthese two wires. V

One of the wires leading ,to. these two terminals is also in such a position'that if the fan belt becomes loose or the wires sag, it will cut through said wires, and the other wire leading to these two terminals is in a position adjacent the connecting rod to actuating the timer so that saidwirc i liable to rest against said rod resulting in a short circuit should the insulation of said ,wire be worn away. As a result of the above described conditions much difiiculty' has been experienced through the short circuiting of the wires leading to these two teri'uinals as well as through the necessity of continually repairing or replacing these wires as they become worn. The wires leading to the other two terminals of the timer are at the side thereof away from the. engine and in a position where they are not subjected to the various wearing actions above set forth.v These wires are also so positioned upon the timer as to be readily accessible for assembling, inspecting and repairing theparts.

It is the object of the present invention to provide a timer construction necessitatcoinpanying drawings, in which;

i920. Serial No..e 93 ,547.

pi:ovide. a timer construction arranged to v provide'a spark' iiiitwo o fftli e cylinders at the 'sanie time, thespark in oneof said cylinders being: :i, working" spark adapted to ignite a coinbustibleeliarge within said cylinder, while thev spark? lthef other cylinder is anidle sparlr" nndeaethe beginning of thef 'suctionfstroke 'within said cylinder ,so

.ns to cause no, efiplosiori therein, but adapted .to burn off a any. 'accinniilat1on upon the points of the' spa'rli' thereby pre- Ye lit: 18311 16,, u

reservation-e111 nanny-imitated from the following description ofjthea'e- Figure l, is a somewhat jdiagrainmatic illustration showing a transverse section 'tlnough the improved. timer and the wiring connections between'the same and the spark pings of'the respective engine cylinders v-:hich .are shown in longitudinal section.

2jis'a longitudinal section on the line 2 -2ef, Fig. 1; 1'

3 is a longitudinal section through the cylindersof the engine showing a somewhat modified wiring connection to the spark plugs from the improved timer.

The timer is mounted upon the end of the usual cam shaft 1, said cam shaft being disposed in a horizontal plane with the end 2 at one side of said casing. The timer (01H- p al casing 3 received over the end oi shaft 1 and abutting against the,engine casing 2 with the casing held in position by any suitable nieans such ,as'the usual retaining clip not shown. A- usual lug -extends from the top-oi the casing and is connected with a usual actuating rod 5 for rotating the -Casing relative to the shaft 1. The usual ring of insulating material as shown at 6 is received against the inner surface of easing l 'tl' 'd"* b d t" t' 0.1i11C 1 un U211 rin are em co co we 0 the usual four contact strips 7 connected to terminal bolts 8 pro]ecting through the cusmg in usual manner. These two contact thereof projecting beyond the engine casing strips are at the side of the timer. away from the engine and are arranged'in'the usual position occupied by the two contact strips at this side-of the timer. It will thus be understood that said contact strips are spaced apart a distance equal to one-fourth of the periphery of the timer casing.

The opposite side oithe timer presents an unbroken surface of the insulator ring 6, this side of the insulator ring being, preferably, retained in position within the timer casing by means of a set screw wh lethe opposite side of the insulator ring is positioned'by means of terminal bolts 8. in usual manner. The terminal bolts are provided with' the usual lock nuts 10 and retaining nuts 11 adapted to clamp the ends of connecting wircsbetwecn the nuts 10and 11.

The contact maker of the timer consists of diametrically opposed" contacts rotatable witlifshaftf 1 so thata" contact is" alternately made} with strips 7 at every quarter revolution of the camshaft, Asan instance of this arrangement the contact maker is shown as a collar 13 fixed upon the end of shaft 1 in usual manner.and-retained in position by nut 1e.- Sleeves 15 project diametrically from collar 13, s aid sleeves being open at their outer ends and each receivinga contact pin 16 arranged for'wiping contact' again t ring 6 and contact s'trips '7 The'pms'may s d; outwar y eans of su springs 17; 4 I

In theform of the invention shown in. Fig. '1, the four engine cylinders, are shown at A, BlfC and D; and'are eachprovided with a usual grounded spark plug20. The spark plugs are connected bywires 21 to the usual s-MB". o ean'- As will be readily'understood, the cylinders, pistons and valves o f the engine. are arranged in usual manner, thatthepistons of cylinders A and D and thefpistons of cylinders 13 and C, aresiinilarly arranged relative ,to the crank shaft; and thevalve mechanism is such that, for example, as cylinder A-is on itsfiring stroke, cylinder D is sucking-in a newf charge, cylinder B is compressing, and cylinder C is exhausting. The coils for cyl inders A and D are connected in multiple parallel by a wire 23 to one of the terminal bolts 8 and coils B and G aresimilarly connected to the other terminal bolt.

Thus it will be seen that at alternate quarter revolutions of the engine, a contact will be closed through coils A and D to cause a spark in cylindersA and D. The spark in the cylinder containing a compressed charge, say cylinder A, will cause an explosion and a working stroke, while the spark in cylinder D, in which there is no charge will be an idle spark. The nexttimes sparkoccurs in these cylinders, whieh will be two strokes later in the cycle of operation, the spark in cylinder BEST AVAlLABLE COPv D will be the working spark while the spark in cylinder A is an idle spark.

In similar manner cylinders B and C will be alternately fired between firing of cylinders A and 1), through the contacts made by the second contactstrip 7.

In the modification illustrated in Fig. 3, wires 23 are. each connected to a single coil A and B The spark plugs of each pair of cylinders A-D and BC, consist of a grounded plug 20 and an insulated plug 20, said pairs of plugs for cylinders 3-D and B-.C being connected in series by a wire 21 to the coils A and B respectively. By this arrangement it will be seen that each time a, circuit is made through the wires lcadingto coils A and B respectively, in the manner previously described, a. spark will occur incylindeis A and D and B and C as above set forth.

It will thus be seen that I have provided a timer'construction by the use of which the regular sequence of operation is maintained in the engine cylinders, a spark occurring, in each cylinder upon alternate strokes, with alternate ones of said sparks a working sparkand' an idle'spark. Furthermore it will be observed that the double end constlruction of the contact maker permit-s of the elimination of the two timer terminals at'the side thereof which is inaccessible, and

which areliable to .become inoperative from various causes.

Various changes may be made without departing from the spirit. of the invention as claimed.

VVha t is claimed is:

1; A timer for tour cycle internal combustion engines, comprising a rotatable contact maker' having diametrically opposed contacts a casing disposed over said contact maker and" stationary. contacts disposed circumferentially in said casing, said stationary contactsbeing less in number than the numberpf' the cylinders of the'engine to which said timer is. applied.

v2. A timer for internal combustion engines having a plurality of cylinders, comprising ajrotatable contact maker having diametrically opposed contacts, a casing disposed about said contact maker, stationary contacts' arranged circumferentially in said casing and engageable with the contacts of said contactmaker, said stationary contacts being less innumber than the number of cylinders of the engine to which said timer is applied.

3. A timer for internal combustion engines having a plurality of cylinders, comprising a rotatable contact maker having diametrically opposed contacts, a casing disposed about said contact maker, stationary contacts arranged circumfcrentially in said casing and engageable with the contacts of said contact maker, said stationary contacts being less in number than the number of cylinders of the engine to which said timer is applied, all of said stationary contacts being arranged upon one side of a diameter or said casing.

l. A timer for internal combustion engines having a plurality of cylinders, comprising a rotatable contact maker having a plurality of radial arms, yield-able contacts carried by said radial arms and a casing disposed over said contact maker, and having a plurality of stationary contacts arranged circumferentially therein, said contacts being less in number ban the number of cylinders of the engine to which said timer is applied.

BEST AVAlLABLE COP 5. A timer for internal combustion engines having a plurality of cylinders, com prising a contact maker having a pair of oppositely disposed arms, a casing disposed about said contact maker, a plurality of stationary contacts circumferentially arranged Within said casing and adapted to be engaged by said arms, said stationary contact being disposed upon one side of a diameter of said casing and being in number equal to one-half of the number of the cylinders of the engine to which the timer is applied.

In testimony whereof I have signed my name to this specification.

CARL O. BRUNO.

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