US1593339A

US1593339A - Ignition apparatus

Info

Publication number: US1593339A
Application number: US738531A
Authority: US
Inventors: Frederick C Kroeger
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1924-09-18
Filing date: 1924-09-18
Publication date: 1926-07-20
Anticipated expiration: 1943-07-20

Description

July 2o 1926. 1,593,339

F. C. KROEGER IGNITION APPARATUS Filed sept. 18. 1924 Patented July 20, 1926.

UNITED sTArEs 1,593,339 PATENT OFFICE.'

FREDERICK C. KROEGER, OF ANDERSON, INDIANA, ASSIGNOR T GENERAL MOTORS CORPORATION, A CORPORATION OF DELAWARE.

IGNITION APPARATUS.

Application led September 18, 1924. Serial' No. 738,531.

This invention relates to electrical ignition apparatus for internal-combustion engines and, more particularly, to the construction of the ignition timer.

One of the objects of the present invention is to secure sparking impulses in more rapid succession than heretofore. In the present invention this is accomplished by reducing the weight of the timer breaker lever to the lowest possible amount while still maintaining a substantial degree of rigidity and byA locating plane of contact of the timer contacts at an angle to a normal to the arc of movement ofthe movable contact.

Another object of the invention is to improve the manner of adjusting the stationary timer contact.

A further object is to improve the manner of connecting the breaker lever and condenser with the ignition timer terminal.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawing. wherein a preferred form of the present invention is clearly shown.

In the drawings:

Fig. 1 of the drawings is a plan view of the ignition timer without the distributor rotor and distributor head; Fig. 2 is a side view partially in section of the ignition timer distributor; Figs. 3, 4, 5 and 6 are sectional views on the lines 3 3, 4-4, 5--5, and 6-6, respectively, of Fig. 1; Fig. 7 is a plan view of the termi-nal plate of the ignition timer.

In the drawings, 2() designates a cupshaped ignition timer housing which supports for rotation, a cam shaft 21, upon which is mounted a timer cam 22 (see Fig. l) and a distributor rotor 23, (see Fig. 2). The timer cup supports a plate 24, attached by screws 25; and plate 24 supports distributor head 26 carrying a center contact 27 and a circular row of posts 28 which cooperate with the rotor 23, in the usual manner.

The plate 24 is provided with a bearing flange 30 which provides a bearing for a breaker lever plate 31 having a handle 32 extending through a notch 33 provided in the side of the bearing plate 24. Plate 31 is maintained upon a plurality of arcuate bearing bosses, which are shown in section at 34 in Fig. 2, by means of studs 35, attached to plate 31 and extending through slots 36 provided in bearing plate 24. The studs 35 receive nuts 37 for the purpose of causing a plurality of resilient dished washers 38 to bear upwardly against a plane washer 39, which in turn is pressed against the undersurface of the bearing plate 24.

Plate 31 supports a stud 40 having a shoulder 41 and a reduced portion 42 which together provide a bearing for the non-con- 65 ducting hub 430i breaker lever 44. Lever 44 comprises top and bottom iange members I 45 and 46, joined by a web member 47.

AThe flanges

45 and 46 are provided with holes in alignment for receiving the hub 43. The hub 43 is secured in position by a clip 48 engaging a groove 49 of the stud 40.

The cam 22 cooperates with an L-shaped rubbing block having one leg 50 located in the path ot movement of the cam and having the other leg 51 located between the

breaker lever flanges

45 and 46. and attached by a single rivet 52 to the web 47. The free end of lever 44 makes a substantial angle with the plane of that portion of the web to which the rubbing block is secured. The outer end of the web portion 47 carries a timer contact 53 for engaging a stationary timer contact 54 attached to an adjusting screw 55, threadedly engaging a clamp bracket 56 at- 85 tached by screws 57 to the breaker plate 31. The clamp bracket 56 includes a portion looped around and threadedly engaging the contact screw 55. One branch 58 of this loop is apertured to receive a clamping screw 59 which threadedly engages the other branch 60 of the clamping loop. The distributor head 26 being removed from the bearing plate 24, adjustments of the timer i contact 54 can readily be made by turning the screw 55 with a screw driver or small wrench and then clamping the screw 55 in position by means of the screw 59. This construction has been found to be more satisfactory than a construction wherein the 100 timer contact adjusting screw is locked in position by a lock nut.

The breaker plate 31 insulatingly supports a terminal plate 6l, which is secured by clamping between non-conducting plates 62 m5 and 63 by rivets 64, which are secured to the plate 31. Plate 6l is provided with holes 65 which are considerably larger than the rivets 64; and the

plates

62, 63 and 31 are provided with holes but slightly larger in diameter H0 than the rivets 64 and located in alignment with the holes 65. The plate 61 carries a post 66 for receiving a screw 67 for attaching to the plate 61 a resilient spring conductor 68 and a conducting strap 69.

The spring conductor 68 extends between the

flanges

45 and 46 of the breaker lever 44 and is attached to the web 47 by the same rivet 52 which secures the rubbing block in position.

The strap 69 is attached by screw 70 to the insulated condenser foil which is located within the condenser case 71. The grounded condenser foil is connected with the interior of the case 71. The condenser is attached to the plate 31 and grounded thereon by a clip 72 soldered to the case 71 and attached to the plate 31 by a single screw 73. Turning of the clip 72 is prevented by providing a recess in the plate 31 and receiving the arcuate portion of the clip -72, as shown in Fig. 3.

The insulated terminal plate 61 is provided with a threaded hole 804er receiving a screw 81 for attaching a wire leading to an ignition coil.

The lever 32 is provided with a hole 82 for receiving a link or other suitable mechanism attached to a lever by which the timer plate mav be manipulated from the drivers seat.

The plane of contact of contacts 53 and 54 is at a substantial angle to a normal to the chord of the arc of movement of the movable contact 53. A slight rubbing of movable contact upon the stationary Contact takes place tending to keep the contacting surface clean, and enabling the timer to operate satisfactorily at higher speeds than when this plane is normal or substantially at right angles to this chord. The angle of the plane of contact to the normal to the chord of the arc of movement of the movable contact is preferably about 9 degrees for the breaker lever shown. This angle may varyaccording to theV dimensions of the breaker lever, and may be little less or greater than this angle. ne of the contacts may be crowned or slightly spherical instead of plane with beneficial effects. It is believed that the relatively high speed operation of this present timer is due to small mass of the lever 44, and the location of the' contact surface of the contacts 53 and 54 with respect to the arc of movement of contact 53.

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

qWhat lI claim is as follows:

1. An ignition timer including a cam, a breaker lever of channel section with channel web located substantially parallel to the cam axis, an L-shaped rubbing block having one leg thereof extending into the path of movement of the cam Lind the other leg located against the channel web and between the channel flanges, a leaf spring having one end attached to a stationary part, and having a portion extending between the rubbing block and the lever, and a single rivet securing said rubbing block and leaf spring to the lever.

2. An ignition timer including a timer housing, a breaker' plate rotatably supported by the housing and having an arm extendin@ from the housing, a breaker lever insu atingly supported by the plate, and a terminal plate insulatingly supported by the breaker plate and having a portion thereof within the housing electrically connected with the breaker lever and a portion located exteriorly of the housing and adjacent the breaker lever arm for receiving a wire-attaching device.

3. An ignition timer including a timer housing, a breaker plate rotatably supported by the housing and having an arm extending from the housing, a breaker lever insulatingly supported by the plate, and a terminal plate insulatingly supported by the breaker plate and having a post located within the housing and a wire receiving portion extending exteriorly of the housing, and a leaf spring conductor connecting said post with the breaker lever. Y

In testimony whereof Iv hereto atx m signature.

FREDERICK C. KROEGER.