US1668266A - Automatic switch - Google Patents

Description

May 1, 1928.

E. E. .CODDINGTON AUTOMATIC SWITCH Filed Sept 20. 1926 2 Sheets-$heet 1 fan, nvcntoo May 1, 1928.

E. E. CODDINGTON AUTOMATI C SWITCH Filed Sept. 20. 1926 2 Sheets-Sheet 2 the 50044;

fan gl vemtoc Patented May 1, 1928.

PATENT OFFICE.

UNITED STATES nurse 1:; conmNG'roN, or LA roars, INDIANA.

AUTOMATIC SWITCH.

Application filed September 20, 1926. Serial No. 136,664;

having connection with the draft and switch with novel means connectingthe throw lever with the thermostat rod. 6

provision of a novel toggle lever connection with the throw arm or lever and novel means carried by' the lever for operating the switch.

A further object of the inventionis the provision of novel means for mounting the switch, whereby breakage of the switch and the throw arm or lever is eliminated. i a

A further object of the inventionis the provision of novel means for forming the the draft and switch operating member is permitted.

A still further object of theinvention is to provide a novel draftcontrolling device and circuit closing lever for thefan there for of the above character, which will be durable and eflicientin use, one that will be simple andeasy to manufacture and one which can be placed upon the market and incorporated with a 'conventional furnace 6 structure at a small cost. a

\Vith these and other objects in view, the invention consists in the novel construction, arrangement and formation of parts, as will be hereinafter more specifically described, claimed, and illustrated in the accompanying drawings, in which drawings:

Figure 1 is a side elevation of the improved device showing the same in its inoperative position, 1 a

Figure 2 is an end elevation of the same, Figure 3 is an enlarged fragmentary section illustrating the means employed for supporting the switch for eliminating the breakage of the parts of the device,

Figure {l is a fragmflntfiryplan view of draft from a single thermostat, the device embodying a throw lever A further object of the invention isl the throw arm or lever whereby adjustment of.

theforward end of the throw arm or lever, showing one type thereof,

Figure 5 's a view slmilar to Figure 1 6 showing the device in its operative position with the switch closed and the throw arm or lever in its arranged position for opening the draft.

Figure 6 is a longitudinal section through a modified form of throw arm or lever in which adjustment is provided for the draft oplelning chain and the switch operating ro err Figure 7 is an enlarged fragmentary side elevation of the forward end of'a still further modified device of the throw arm or lever showing a bridge member for the switch of the hook type, and

Figure 8 is a fragmentary side elevation ofra still further modified form of the throw arm or lever showing a bridge piece for the contact of the switch of the drag or leaf spring type. 6

-Figure 9 is a view similar to Figure 1 showing the device associated with a furnace, a r

6 Referring to the drawings in detail,

wherein similarreference characters designate corresponding parts throughout the several views the letter A generally indicates the improved device which comprises an operating .or throw arm or lever 10. which is pivotally mounted at its inner end in suitable brackets 11. This bracket 11 can be connected to the furnace structure or mounted above the furnace structure at any desired point. The forward endof this l'ever supports a yoke 12 carrying a rotatable switch throw roller 13. This roller preferably consists of a solid wooden hubl i with an outer metal sleeve 15.

Arranged belowt-he throw or operating lover or arm 10 is the thermostatrod16 which leads out of the furnace from the thermostat in the ordinary way. A. toggle lever 17 has its outer end pivotally connect ed respectively to the throw arm or lever 10, and to a bracket 19 as at 20. This bracket 19 can be secured directly to the furnace structure. The/toggle lever includes the'usual links which have their inner ends pivotally connected together. The thermostat rod has its outer end provided with a yoke 21 which is pivotally connected as at 22 to the lowermost linkof the toggle lever 17 adjacent to the pivot point 20 and it is obvious that upon inward and outward movement of the thermostat rod 16-that the ble chain 23 which is connectedto the fur nace draft door.

As stated the roller 13 is utilized for closing a switch, and this switch is generally indicated by the reference character 24 and is of the throw lever type. The switch embodies a base plate 25 to which is pivotally connected the foot lever 26, the forward end of'which is adapted to engage a contact post 27. The lever is pivotally mounted intermediate its ends, and the lower end of the lever at a point remote from the end which engages the post 27 is provided with a rubber head 28 and a contractile coil spring 29 is connected to said head and normally tends to hold the lever 26 from out of engagement with said post. The free end of the lever is arranged in the path of the roller 13 and thus upon actuation of the toggle 1'7 and the raising of the throw arm or lever the foot lever 26 will be moved into contact with the the tension of the spring 29.

In order to prevent breakage of the switch 'and the throw arm or lever-l0, the switch is mounted in a novel manner and as shown the base of the switch secured by suitable fastening elements to a depending arm 30 which is pivotally connected at its upper end to a supporting block 31, as at 32. This bloelcis suitably connected to a ceiling joist 33 or the like. The arm 30 is adapted to normally abut a stop blocl' 34; also secured to the ceiling joist and this block extends below the block 31 and engages the inner face of the arm 30.,

In order to normally hold the arm 30 in engagement with the block a U-shaped strap 35 is secured to the arm which straddles the block 34 and a flexible cable 36 is connected to said strap and is trained over a pulley 37 carried by the depending bracket 38 secured to the joist. A weight 39 is connected to the free end of the cable and thus the weight normally tends to move the arm in engagement with said block 34, ashoretobefore stated.

In order to insure the ing of the block and the arm a contractile coil spring 10 is also provided and this coil spring engages the outer face of the arm 30 and a U-shaped saddle strap 4]. which has its terminals connect-ed to the block 34.

In operation of the improved device, when the furnace cools, the rod will be drawn inwardly and will pull in on the toggle 17 and thus raise the throw lever 10. The upward movement of the throw lever 10 will move proper positionthe roller 13 in contact with the free end of the foot lever 26 and rock the same on its pivot and. move the foot lever in conposts 27 against vouter end provided with tact with the posts 27. This will close the circuit to the fan and as the lever 10 rises a pull will be exerted on the chain 23 which will open the draft of the furnace. Due to the swinging are of the arm or lever it is necessary that a certain give between the throw arm or lever 10 and the switch be permitted and the arm 30 allows for this movement and the lever will swing the arm Eltloutward against the tension of the spring 4:0 and the action of the weight 39. The spring at all times.

In Figure 6 I have shown a slightly modified form of the throw arm or lever 10 in which means is provided for permittingthe adjustment of the roller 13 toward and away from the arm and adjustment of the chain 23 longitudinally of said arm. To carry out this feature, the arm 10 adjacent the forward end thereof is slotted, as at 42, and bolts 43 utilized for connecting the brackets 12 to the arm extend through the slots. It is obvious that by loosening the bolts, the bracket can he slid inward or outward as desired. In this form the chain 23 is rovided with a clevis 44 having a bolt 45 w ich extends through a slot 46 in the arm or lever. By loosening the bolt the clevis can he slid longitudinally of the lever to allow initial adjustment of the same. 7

\Vhile I prefer to utilize'a roller 13 for operating the switch, it is to be understood that the arm or lever 10 can be utilized directly for closing the circuit.v In Figures 7 and 8 I have shown means for accomplishing this. In Figure .7 the arm 10 has its a. hoop shaped bridge piece 50 made of suitable conducting material which is adapted to engage spaced contacts 51 and 52 when the arm is raised. The contacts can be carried by the depending arm 30 as shown in Figures land 5. j

, In Figure 8 I have shown a resilient bridge piece 53 for engaging the contacts 51 and 52 when the lever is raised and this bridgepiece is formed on the outer end of a strap 54 which is bolted to the arm or lever 10.

Changes in details may be made without departing from the spiritor scope of this invention, but:

hat I claim as new is:

1. In a heat control device for furnaces, a single throw lever pivotally mounted at one end, means for raising and lowering'the lever from a thermostat, a switch disposed in the path of the lever, means flexibly supporting the switch, andv a draft door chain connected with said lever.

2. In a heat controlling device for furnaces, a single throw lever pivotally mounted at one end, means for swinging the lever on and weight also tends to insure proper engagement of the lever 26 with the roller its pivot by a thermostat, a switch disposed in the path of the lever, a pivoted arm supporting the switch, and means normally holding the switch in engagement with the lever.

8. In a heat control device for furnaces, a single throw lever pivotally mounted at one end, a toggle supporting the lever, means for operating the toggle from a thermostat, a switch disposed in the path of the lever, a pivoted arm supporting the switch, and means normally urging the arm in one direction for holding the switch in engagement with the lever, and a flexible draft door chain, connected with said lever.

4:. In a heat controlling device for furnaces, a single throw lever pivotally mounted at one end, means for swinging the lever from a thermostat, a depending pivotally supported arm, a knife switch carried by the arm including a pivoted foot lever, and a contact post, spring means normally holding the switch lever from out of engagement with the post, the foot lever being arranged in the path-of the lever, and means normally urging the arm in one direction for holding the switch in correct position relative to the arm.

5. A heat control device for furnaces comprising a throw lever pivotally mounted at one end, a toggle lever connection, means for operating the toggle lever connection from a thermostat for swinging the throw lever, a depending bracket, an arm pivoted to the bracket and depending therefrom, a stop arranged in the path of the arm, a switch carried by the arm and arranged in the path of the throw lever, a weight and pulley connection for said arm normally urging the same toward said lever, and spring means normally urging the arm toward the lever.

6. In a heat control device for furnaces, a single throw lever embodying a switch operating roller, means for adjusting the roller longitudinally of the lever, a flexible draft door chain connected with the lever and means for adjusting the chain longitudinally of the lever.

In testimony whereof I afiix my signature.

ELMER E. GODDINGTON;

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