US1914231A - Tqusr - Google Patents

Description

June 13, 1933. J. ARMSTRONG TIMER Filed Jam 15, 1952- 2-Shaets-Sh eet 1 20 is Y www- INVENTOR Leonard/J. .5111? ATTORNEYS WITNESSES June 13, 1933. J ARMSTRONG 1,914,231

' TIMER Filed Jan. 15, 1932 2 Sheets-Sheet 2 INVENTOR v WITNESSES v Leonard j lrmsfi'ongt j 6 M I Wkl. ATTORNEYS Patented June 13, 1933 UNITED STATES PATENT omen v rnma Application filed January 15, 1888. jerlal No. 588,888.

An object of the invention is to provide a timer which is of articular value when used with internal combustion engines and which has positive means for moving a contact into and out of engagement with a stationary contact to insure periodic contacts and to prevent missiing when the engine is running at high s so Another object of the invention is to dispose an arm having the movable contact between two cams w ich engage the arm and which positively move the arm back and forth as the cams are rotated, the movement of the arm not only being determined by the speed at which the cams rotate, but by the configuration of the cams.

Still another object of the invention is to maintain a predetermined rate ofrotation of the cams relativel to each other.

The invention urther comprehends a timer in which a shaft is rovided with a cam and a gear, the gearmes. ing with a gear or ears on one or more stub shafts, each of whic has a cam between which and the first mentioned cam an arm of a movable contact is disposed to be positively moved back and forth relatively to a stationary contact or contacts with the running of the engine.

Additional objects of the invention will appear in the following specification in which t e preferred form of the invention is de- In the drawings similar reference characters refer to similar parts in the several views, of which Figure 1 is a plan view illustrating the timer with parts broken away to show the construction,

Fi re 2 is a sectional view on the line 22 of Figure 1, and

Figure 3 is a plan view of a modified form of the invention.

By referring to the drawings, it will be seen that a hollow base 5 is rovided, the base having a bearing 6 in w ich is rotatably mounted a shaft 7. The hollow base 5 is closed b a plate 8 having an opening through which tile 5 aft 7 extends. Secured to this shaft 7, above the .plate 8, there is a gear 9 which meshes with gears 10 and 11, the gear 10 being secured to a cam 12, the gear 10 and the cam 12 being mounted for rotating on a stub shaft 13 which is secured to the plate 8 and to a frame 14. The gear 11 is secured to a cam 15, the gear 11 and the cam 15 being mounted to rotate on a stub shaft 16 which is secured to the plate 8. and to the frame 14, the frame 14 bein broken awa in Figure 1. Secured for rotating with the s aft 7 and the gear 9, there is' a cam 17. It will be understood that, with the rotation of the shaft 7, the gear 9 and the cam 17 will be rotated and that through the gears 10 and 11, which mesh with the ar 9, the cams 12 and 15 will also be rotated, ut in the op osite direction to the direction of rotation o the cam 17 I 5 Disposed between the cams 17 and 15 there is an arm 18, which may be a spring arm, and which is anchored to a stud 19 mounted on' the late 8, the arm 18 having insulating mem' ers 20 at its sides which are engaged by the cams 15 and 17. In asimilar manner, an arm 21, which may be a spring arm, is dispeosed between the cams 12 and 17, the arm 21 ing anchored to a stud 22 secured to the plate 8 and having insulating members 23'at its'sides which are en ged by the cams 12 and 17 It will be un erstood that the cams 12, 17 and 15 are of such a configuration that, with their rotation by means of the shaft 7 and the ears 9 10 and 11, the cams will en ga e the insulating members 20 and 23 at both si es of the arms 18 and 21 at all times, so that, with the rotation of the cams, the insulating members 20 and 23 at both sides of the arms 18 and 21 will be ositively moved by the cams back and forth. Each of the arms 18 and 21 is provided with oppositely disposed contact members 24 for engaging stationary contacts 25 between which the contact members 24- are disposed respectivel It will, therefore, be understood that, with the rotation of the shaft and through the gears and cams which have been described, the arms 18 and 21 will be positively moved back and forth, so that the contacts on the arms 18 and 21 will periodically en age the stationary contacts 25. Thesestationary contacts 25 are electrically connected with wires 26 leading from a primary circuit or circuits in an induction coil or coils, the circuit being completed through the contacts 24 and 25, the arms 18 and 21 and the ground at the studs 19 and 22. The secondary circuit will preferably lead to a distributor brush 27 mounted on a base 28 which is secured for rotating with the shaft 7 and which has an electrode 29 from which a spark may jum to a communicating means leading to a spar plug.

It will be seen by referring to Figure 10f the drawings, that the arms 18 and 21 are disposed at an angle to each other and that the cams 12, 15 and 17 are so disposed that a contact on one of the arms is in engagement with one of the stationary contacts, while the contacts 24 on the other arm are both spaced from the stationary contacts 25. It will be understood that various arrangements may be made with reference to positioning the arms 18 and 21, and also that various arrangements may be made with reference to the combination of the earns 12, 15 and 17, so that any desired positioning of the contacts on one of the arms may be obtained relatively to the positioning of the contacts on the other arm when the shaft has been turned to any predetermined position.

The construction illustrated in Figure 3 of the drawings corres onds with the construction illustrated in igures 1 and 2 of the drawings, with the exception that the stationmy contacts 25 are insulated from each other and that there are preferably four coils, a primary circuit in each coil being connected by the wires 30, 31, 32 and 33 with each of the stationary contacts 25'. It will also be seen that in Figure 3 of the drawin the arms 18 and 21' are disposed paralle with each other, while in Figure 1 of the drawings the arms 18' and 21' are dis at an angle to each other. It will also be seen that in Figure 3, the frame 14' has arms 34 which are mounted on the studs 19' and 22', the said studs 19 and 22' being disposed at opposite sides of the plate 8. The frame 14' is preferably insulated from the stub shafts 13 and 16.

What is claimed is:

1. In a timer, two rotatable cams, an arm having a movable contact, the arm being disposed between the cams, the cams havin cam surfaces which engage opposite sides 0 the arm at all times to positively move the tacts.

arm back and forth, and a stationary contact or contacts for engagement by the movable contact.

2. In a timer, two rotatable cams, an am having a movable contact, the arm being disposed between the cams, the cams having cam surfaces which engage opposite sides of the arm at all times to positively move the arm back and forth, a stationary contact or contacts for engagement by the movable contact, and eari connecting the cams.

3. a timer, two came, a shaft for rotating one of the cams, gearing connecting the cams for rotating the other cam a movable contact having an arm disposed between the cams to be operated thereb and two stationary contacts between which the movable contact is disposed for periodically engaging the stationary contacts.

4. In a timer, a shaft having a gear, a cam secured to the shaft, two stub shafts, two additional gears meshing with the first mentioned gear and with one mounted on each stub shaft, two additional cams, one secured for rotating with each of the additional gears, two arms, each disposed between one of the additional cams and the first men tioned cam to be positively moved back and forth thereby, two movable contacts, one mounted on each of the arms, and a plurality of stationary contacts positioned for engage ment by the movable contacts.

5. In a timer, a shaft having a car, a cam secured to the shaft, two stub s afts, two additional gears meshing with the first mentioned gear and with one mounted on each stub shaft, two additional cams, one secured for rotating with each of the additional gears,

two arms, each dis between one of the additional cams an the first mentioned cam to be positively moved back and forth thereby, the arms having insulation at the cams, two movable contacts, one mounted on each of the arms, and a plurality of stationary contacts positioned for engagement by the movable contacts.

6. In a timer, a shaft having a gear, a cam mcured to the shaft, the cam having a plurality of cam surfaces,- two stub shafts, two additional gears, one mounted for rotating on each stub shaft, the additional gears meshing with the first mentioned gear, two additional cams, one secured for rotatin with each additional gear, each of the additional cams having a plurality of cam surfaces corresponding in number with the cam surfaces of the first mentioned cam, two arms, each disposed between one of the additional cams and the first mentioned cam to be positively moved back and forth thereby, the arms having insulation at the cams, two movable contacts, one mounted on each of the arms, and a plurality of stationary contacts positioned for engagement by the movable con- 7. In a timer, two 0 an movable contact, the arm being disposed tween the cams to be positively moved back and forth thereby, a stationary contact or contacts for engagement b the movable contact, and means to rotate e cams in unison.

8. In a timer, a cam, two additional cams, two arms extending at an angle to each other, each arm being disposed between the first mentioned cam and one of the said additional cams to be operated thereby, contacts on each of the arms, and two sets of contacts, each set armhavin a of contacts being positioned for engagement by the contact or contacts on one of the arms. 9. In a timer, a cam, two additional cams, two arms extending at 'anangle to each other, each arm being disposed between the first mentioned cam and one of the said additional cams to be operated thereby, contacts on each of the arms, two'sets of contacts, each set of contacts being positioned for engagement by the contact or' contacts on one of the arms, and means for rotatin the cams. 10. In a timer, a cam, two additional cams, two arms each dis osed between the first mentioned cam an one of the additional cams, two pairs of contacts, a contact or contacts on each arm disposed between a pair of the first mentioned contacts, and means to rotate the cams.

11. In a timer, t'wo cams, an arm havin a movable contact, the arm being di osed tween the cams and being engage by the two cams at all times, a stationary contact or contacts for engagement by, the movable contacts, and means to move the cams relatively to each other.-

LEONARD J. ARMSTRONG.

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