US2030933A

US2030933A - Magnet switch

Info

Publication number: US2030933A
Application number: US693813A
Authority: US
Inventors: Lawrence M Persons
Original assignee: Penn Electric Switch Co
Current assignee: Penn Electric Switch Co
Priority date: 1933-10-16
Filing date: 1933-10-16
Publication date: 1936-02-18
Anticipated expiration: 1953-02-18

Description

Feb. 18, 1936.

A L. M. PERSONS MAGNET SWITCH Filed oct. A16. 1933 l FURNME coNTRouNo 1 necnANLsH VARHH A* ,Zawfezzce www .ment and combination of the various oi.' Figure 5 in another Patented Feb. 13,1936

surpass MAGNET Lawrence M.

a corporation of Iowa Application october 1e. 1988.

Persons, Des to Penn Electric Switch 6-,

SWITCH Moinellowsassignor Despioinenlowa.

Seri!! No. 693,818

1o emma. ci zoo-noi,

The object o! my inven on isto provide amagnet switch which is simple,vdurable and comparatively in ve to manufacture.v

A further object o! my invention a switch structure in which a magnet is used for giving snap actionv to a switch arm, thev switch arm being characterized by armatures, one on give stepped snap action, is equal in both directions. A further object is to structure in which the o! the switcharm. as be adjusted in a fool a magnetic shunt.

With these and other objects in view my invention consists in the construction, arrangepartsl of my the objects contemplated are atfully set forth, illustrated in the is to provide as required.

provide a magnet switch dierential oi.' operation ailected by the magnet, can prooi manner by the use of device, whereby pointed out in my claims, and

accompanying drawing. in which:

Figure l is a front mostat embodying elevation of a room thermy invention and showing the cover therefor removed.

Figure 2 is a side elevation ot the same.

Figure 3 isan enlarged view. partlyvin section, showing the essential parts of Figure l in a di!- !erent position.

Figure 4 is a iront elevation of the magnetic shunt feature oi* my invention.

Figure 5 is an electro tic view showing one instailation'in which a switch structure embodyingmy invention can be included.

' Figure 6 is a diagrammatic viewshowing parts position; and

Figure '1 is a similar diagrammaticview showing a modified form oi switch structure.

gdrawing, I have used the Secured to the base il! is a post i! having pi'voted thereon a bimetal coil carrier arm Il. A bimetai coil Il is secured, as at It, to the arm Il. y

The pivoted arm Il can be adjusted and is provided with a projection 20 secured thereto i'or this purpose. The projection 2li is confined between side bars 22 oi aiorked adjusting lever Il.

' The lever 2l lis pivoted at Il to the base Il, as

. to and located shown in the applicationl of Gustave A. Lennholm. tiled December i9, i932, serial No. 647,861.

A switch arm- Il is secured to the bimetal .coil il for swinging movement thereby as caused by room temperature changes. The switch arm 2l has a pair o! armatures ll and I2 secured thereon opposite sides oi a permanent l2. Thevbracket lil rial positioned against The screw 36 extends into a bracket I0 which is securedtothebaseliiande toaterminai has mounted thereon. a leaf spring carried contact 4I, while the switch arm 28 has a coacting leaf spring carried contact 4l. 10

An insulated stop screw 4l extends an ear-like extension oi the bracket Il for limiting movement oi the switch arm 2l in one direction. Its movement in the opposite direction is limited by a stopwfew Il through x5 an ear oi a bracket 5I. Astop bar Il, a contact'arm Il and a leaf spring mounted contact .Il are interposed the stop screw Il and a contact il carried by the switch arm it.

Il and are carried by the bracket ao l2, the arm li being swingbly by reason oi being secured to a leaf spring i! which carries the contact i8. The stillness of the spring iicanbeadjustedbyasetscrewllcontactingwithanarmltwhichinturnengagelao the spring i2.

In'connection withthe magnet 3l, I provide a magnetic shunt which is made oi sott viron or other magnetic metal. It is in-the form ot a' plate riveted at 1li to the leaf spring' plate Il. 30 the shunt being provided with an opening 12 to accommodate the head oi the screw ll. The tendency oi the leaf spring plate Il is to retain the magnetic shunt 0l against the poles of the magnet 3|. Thus the magnetic neld is variable 35 for ailecting the armatures I! and Il. The neld can be increased by spacing the portion of the,` magnetic shunt adjacent the poles o! the magnet at a greater distance from the magnet, .as

cially adaptable- During the daytime the switch arm will operate through a range indicated in Figure. 3 as Dayrange. When at the lett extreme of the Day range, as shown in Figure 5, the circuit to the furnace controlling mechanism is broken be- 50 thermostat. 45

alsY

l of the arm 56, the

move it away from the magnet and to the right hand limit range 6 0 and 58 will snap to When it opens the contactsfls, the room thermostat becomes operative as a the Night range", closing the contacts 46 and M the magnet, and the other in which the armature 30 is movable as in Figure 3 to positions adjacent or slightly spaced from the magnet I4 and the armature 32 is substantially spaced therefrom. The same construction can be applied to a three wire thermostat in which the switch arm 28 is provided with contacts l2 and gfo'r instance as shown in Figure 7, for cooperation with contacts 88 and Il, one wire running to the switch arm 2l and thereby the contacts 82 and 84 and the other two wires running to the contacts 86 and 88.

where one circuit turns the furnace controlling and another turns it on". The switch arm in this instance would he movable to suicient, too sluggish.

The "Night range g Figure 3 can bereducedto any 4desired number in Figure 3,

of the switch shown in' of degrees below the "Day range. by increasing the tension of the leaf spring 62, this being v is strictly undesirable. By having the screws 48 and Ell set at the factory, however, and using may be reasonably included within their scope.

I claim as myv invention: 1. In a switch for controlling an electric circuit, a base, a horseshoe magnet mounted therewhen at opposite limits o1' its movement.

3. In a switch structure. a two arm is at its other limit o1' movement.

4. In a switch structure, a two pole magnet. a switch arm, a pair of armatures on said switch pairs of switch contacts, one pair engaged and disengaged when'one armature is adjacent said magnet and the vother pair engaged and disengaged when the other armature is adjacent the magnet.

5. In a switch structure, a two pole magnet, a switch arm, a pair of armatures on said switch arm, said armatures being spaced from each other and located on opposite sides of the poles of said magnet and each in the magnetic field of both poles, said switch arm being movable through arange with one armature adjacent said poles at one limit of movement of the switch arm and the other armature thereadjacent at the other limit of movement of the switch arm and two pairs of switch contacts, one pair engaged and disengaged when one armature is adjacent said magnet and the other pair engaged and disengaged when the other armature is adjacent the poles and said first mentioned armature is then substantially spaced therefrom.

6. In a control structure, a two pole magnet, a controller arm and a pair of armatures on said arm, said armatures being spaced from veach other and located on opposite sides of the poles of said magnet and each in the magnetic eld of both poles, said lcontroller arm being movable through a range with one armature adjacent said poles at one limit of movement of the arm and the other armature thereadjacent at the other limit of movement of the arm.

7. In a switch structure, a two pole magnet. a switch arm, a pair of armatures on said switch arm, said armatures being spaced from each other and located on opposite sides oi' the poles of said magnet and each in the magnetic field of both poles, said switch arm being movable through a range with one armature adjacent said poles at one limit of movement of the switcii arm and the other armature thereadjacent at the other limit of movement of the switch arm, switch contacts engaged and separated by said switch arm when at opposite limits of its movement and a magnetic shunt for said magnet to change the differential of operation of said switch arm.

8. In a switch structure, a two pole magnet,

Aa switch arm, a pair of armatures on said switch arm, said armatures being spaced from each other and located on opposite sides o! the poles of said magnet and each in the magnetic iield of both poles, said switch arm being movable through a range with one armature adjacent said poles at one limit of movement of the switch arm and the other armature thereadjacent at the other limit' of movement of the switch arm, two pairs of switch contacts, one pair being engaged when the switch arm is at one limit of its movement and the other pair being engaged when the switch arm is at its other limit of movement and a magnetic shunt-for varying the intensity of the magnetic iield of the magnet on said switch arm.

9. Ina switch structure, a two pole magnet, a switch arm, a pair of armatures on said switch arm, said armatures being spaced from each other and located on opposite sides of the poles of said magnet and each in the magnetic iield of both poles, said switch arm being movable through a range withone armature adjacent said poles at one limit of movement of the switch arm and the other armature thereadjacent at the other limit of movement of the switch arm, two pairs of switch contacts, one pair engaged and disengaged when one armature is adjacent said poles and the other pair engaged and disengaged when the other armature is adjacent said poles and a magnetic shunt for varying the intensity ot the magnetic field of the magnet on said switch' arm.

10. In a switch for opening and closing an electric circuit, a base, a horseshoe magnet xed on said base, an operating arm movably mounted on said base for movement simultaneously toward or away from both poles oi'4 said. magnet and a magnetic shunt for varying the intensity of the magnetic iield aiecting said operating arm, said magnetic shunt comprising a pole shunting element, a leaf spring secured thereto and to said base, said leaf spring being under tension to bias said pole shunting element to engage the poles of said magnet, and a set screw threaded in said pole shunting element and engaging said magnet to force said pole shunting element away therefrom against the constraint of said leaf spring member.

LAWRENCE M. PERSONS.