US1773186A - Timer - Google Patents

Description

Aug. 19, 1930. c. w. HUNTER 1,773,186

TIMER Filed March 27. 1929 INVENTOR.

a ar/6's 1 6022722 A TTORNE Y.

Patented Aug. 19, 1930 cmiins w. HUNTER, or LOS enemas, CALIFORNIA TIMER I fhpplicatien filed March 27, 1929. Serial no. 350,230.

This invention relates to a current interrupting device for the ignit on system of an internal combustion engine.

An objectof-the invention 15 to provide improved means for housing the operatingparts of the device whereby access may more readlly be had to any part which needs repair or replacement" Afurth'er object of the invention .is to 'provicle (in -improved interrupting device and ignition systemfltherefor which are particularly adapted for use onthe' engines of aeroplanes, and which may "beflsafelyfand quickly 1ep'airedfor =ime arts thereof replaced without diificulty,and"without stopping the operation of th'eengina'while an: aeroplane is in flight 7 m 3 I With the above and possibly other objects in view, the invention includes'acasingwvliei'e inis liousedthe mechanism ofthe device, said casing having doors whieh form la part of the wall" thereof, a" portion-Lo f, said 'mecha nism being attached to each of said doors to be moved therewith'into and'out o'f its'operative position, the opening movementof said doors bringing the mechanismcarriedthereby into 'a conveniently accessible position'fo'r replacement or repair, and also affording ready access tothe portion of the'mechanism mounted within' the stationary part'of the casing. g

Referring to the' accompanying drawings, which illustrate what is at'presentldeemed'to be a preferred embodiment,

' Fig. l is a plan view of the "device, the up per side'of the cover being removech-the door being shown in full lines in the closed posi tion and in dotted lines in the open position.

Fig. 2 is a side elevation, partly in mid-sec tion on line 22 of Fig. 1. 1

Fig.3 shows an extension shaft located between a distributor and the engine.

Fig. 4 is a plan view of Fig. 2.

Fig. is a section on line 55 of-Fig. 1.

Referring in detail to the drawings to the timer shaft 7 is secured a multiple cam 8, said cam in the illustrated embodiment of the invention being a disk having six equidistant circumferentially arranged rounded cam points 8 with which cooperate two 0ppositely disposed contact arms 9 and 10 of identical construction. Said contact arms are-respectively mounted upon pivot posts 11 and 11" which extend up fromthe base plate 12 Terminals 1-3 and 14 are provided to cooperate with these arms. 1

The pivot posts11 of-the contact arm 9 is secured to the segmental door 12 which, when closed, forms a continuation of the casing-wall '6, said door being pivoted to the casing at 13 the free end of said door closing down upona recess 13 and being provided with a'latch 15. To the inner surface of'the saiddoor l2 is attached. a curved leai 'spring16 which engages one ofthe limbs of the L sha'p ed contact arm 9 thus tending to move the contact pointl'? of said arm into enga ement with the terminal 13.

aidterminal 13is'manually adjustable, being carriedfby a winged bolt 20 which has a: sorew-threatledengagement with an internally' threaded boss 21 formed on door 12, a winged lock nut 22 being provided for said bolt 20, and to hold the conducting plate 28 in place. Oppositely to the'door 12 the casin'gis provided with a similar door 12, upon theinner side of which are mounted the contact arm 10,,adjustable terminal 14, contact point 17 pivot post 11, spring 16, and door hinge 13 all olflwhich function the same as the corresponding parts which have already been described.

In Fig. 3 is shown an instrument board 30 upon whiclrthe timer casing 6 is mounted, said instrument board being -spaced at a considerable distance away from the motor 31. The gearing 32 of said motor is timed properly to rotate to driving shaft 33 which is operatively connected with the timer shaft 7 by means of a universal joint 31. This arrangement makes it more convenient for the mechanic to repair the device during flight.

Each door is normally locked by a locking bolt inserted into the lower side of the casing near the free end of said door. Said bolt is normally held in the locking position by a leaf spring keeper :1 which is pivoted to the casing by a screw 42.

In Fig. 5 is shown, in sectional detail, an upstanding pin lllixed to a support 12" to form a pivot for arm 9 which is removably placed on said pivot. The swivelled spring arm 11 normally guards said arm from displacement.

Current from a suitable source, in the present instance a battery 40*, is supplied to the high tension coils 41 and .41, connected by wire 41, "Theillustrated embodiment-of the invention shows two sets of current interrupting devices, one set being supplied through the high tension coil 41 and the other set being supplied through the high tension coil 41. The set of devices supplied through the coil 41 comprises the spring actuated terminal 42 which wipes upon a ring 43 mounted in the rotary head. 41 is a lead for coil 41, and 41 is a lead for coil 41. These leads are normally in circuit with the doors 12 and 12 as shown in Fig. 1.

Head 44 is provided with another outwardly extending arm 45 through which extends a lead 46 to conduct current from said ring 43. Said lead 46 is constructed and arranged to cooperate with a series of terminals 47 whereby one memberof each of the pair of. spark plugs which is located in each engine cylinder. is supplied with current.

The other set of contact devices comprises the centrally located spring actuated terminal 50 Qwhich engagesv a contact 51, the head 44. being provided with an arm 52 through which passes a conductor 53 to 0on duct current from said contact 51. Said conductor 53 cooperates with a series of termi nals 54 whereby the other member than that already mentioned of each of the pair of sparkplugs in the individual engine cylinders is supplied with-current. ,t I In the illustrated embodiment of the invention the doors on which part of the circuit-making and circuit-breaking elements are mounted, are shown hinged to the casing but it is not intended that the invention shall be limited to doors of this character, but other closure devices for openings in the casing wall :maybe provided to, perform the function of these doors, without departing from the spirit of the invention. v r

One of the doors may be opened and the electrical equipment carried on the inner face thereof be repaired without stopping the engine, because each engine cylinder is provided with two sets of ignition devices, and each of these devices is in a different system from the other, the opening of either door affecting the circuit of only one of these ignition systems.

An extra door may be provided on which is mounted a duplicate set of circuit-breaking elements, and this door may be substituted for a door which is removed on account of faulty operation of the circuit breakers carried thereby.

. Claims:

1. In a device of the class described, a current interrupting mechanism comprising a distributor head and a casing within which said mechanism is normally housed, said casing having a door which forms a part of the wall thereof, a portion of said mechanism being attached to the inner side of said door to move therewith into and out of operative position. i 1

2. In a device of the class described, multiple system current interrupting means comprising a distributor headand a casing within which said interrupting means is normally housed, said casing having a plurality of ,doors, a portion ofsaid interrupting means being attached to each of said doors to move therewith into and out of operativeposition.

3. In a device of the class described, a casing having a relativelylarge opening through its wall, a door for said casing'forming aclosure for said opening, circuit-making and circuit-breaking elements part of which are mounted onthe inner side-ofsaid door to be brought into an accessible position when said door is opened, and cooperating contacts carried by said door and easing, said contacts completing the circuit through the aforementioned elements carried. by ,said door when it is closed and when it is open interrupting the circuit of which they form a part.

, 4. In a device of the class described, a casin g vhaving a relatively large opening through its wall, a door for said casing forming a closure for said opening, circuit-making and circuit-breaking. elements part of which are mounted on the inner side of said door to be brought into an accessible position when said door is opened, and cooperating contacts carried by said door and casing, said contacts completing the circuit through the aforementioned elements carried by said door when it is closed and when it is open interrupting the circuit of which they form a part, one of said cooperating contacts being a spring arm which is pivoted to the casing to swing to and from a position for holding said door closed. I 5. In a device of the class described, a current interrupting mechanism including a rotary distributor head, a two-armed contact making and breaking member which cooperates with said head; and a terminal with which one of the arms of said two-armed member cooperates, said casing having a door which forms a part of the wall thereof, said two-armed member and said terminal being attached to said door to move therewith into and out of operative position.

In testimony whereof I hereunto allix my si ature.

CHARLES W. HUNTER.

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