US1238776A - Thermostatic trip-switch device. - Google Patents

Description

I. JACKSON THERMOSTATIG TRIP SWITCH DEVECE.

APPLICATION man sEPT..24, I915- lfia fiwe Patented ept, 4,191?

2 SHEETS-:SHEET I.

' 11v VENTOR. WITNES 5ES: JEssE Lac/r60 A TTORNE .l. JACKSON.

THERMOSTATIC TRIP SWITCH DEVICE.

APPLICATION man SEPT-24, I915.

Patented Sept. 4,1917.

2 SHEETSSHEET 2.

JEssE ha/rsa/v' A TTORNE YS.

JESSE JACKSON, OF KOKOMO,'INDIANA, ASSIGNOR TO GLOBE STOVE &

RANGE coM- IPANY, F KOKOMO, MICHIGAN.

THERMOSTA'I'IC TRIP-SWITCH DEVICE.

Specification of Letters Patent.

Patented Sept. 4, 1917.

Application filed September 24, 1915. Serial No. 52,496.

i To all whom it may concern:

Be it known that I, J nssn J AcKs'oN, a citizen of the United States, residing at Kokomo, county of Howard, State of Indiana, have invented certain new and useful Improvements in Thermostatic Trip-Switch Devices, of which the following is a specification.

This invention relates to improvements in thermostatic trip switch devices for electric stoves and ovens.

The main objects of this invention are:

First, to provide a control device, especially an electric switch, which is tripped automatically by thermostatic action at any readily regulated point.

' Second, to provide for the setting of the trip mechanism and adjusting for the desiredtemperature for tripping by a simple manipulation of a single operating lever or handle.

Further objects, and objects relating to structural details and economies of construction and operation, will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described in .the following specification. The invention is clearly defined and pointed out in the claims. A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing forming a part of this specification, in which:

Figure I is a side elevation of my thermostatic control device with the connections to the supply circuit for the heater shown.

Fig. II is a side elevation of my thermostatic control device with the cover removed showing the switch and trip mechanism.

Fig. III is a detail vertical section through the indicator dial and means for setting the adjusting lever or handle, taken on a line corresponding to section line 3-3 of Fig. I.

Fig. III is a detail vertical section taken on line 33 of Figs. I and III.

Fig. IV is a detail vertical section showing the trip mechanism when set, the same released being shown dotted, taken on a line corresponding to the section line 4. 1 of Fig. 11.. v

- Fig. V is a detail vertical section through the switch taken on a line corresponding to the section line 5-5 of Fig. II.

Fig. VI is a detail vertical section through the ad ustment of the thermostatic rod, taken on a line corresponding to the section l1ne 66 of Fig. II.

Flg. VII is a detail horizontal section showing the fastening of the thermostatic rod at one end, taken on a line corresponding to the section line 7-7 of Fig, I.

Fig. VIII is a detail vertical section showing the fastening of the thermostatic rod at one end, taken on a line corresponding to. the section line 8-8 of Fig. VII. I

In the drawing similar reference characters refer to similar parts throughout the several views,and the sectional views are taken looking in the direction of the little arrows at the ends of the section lines.

In referring to the drawings, I consider the reference characters as representing the parts themselves. 1 is a case which holds the trip mechanism and switch from which depend two supporting bars 2 securely en gaging at their lower ends the block 3, the ends of the bars being hooked under the same. Between tliese two supports is a thermostatic rod 1, one end of which passes through block 3 and is pinned thereto. Rod 4 is further guided by loosely passing through guide block 4 which is securely fastened between bars. The other end of rod 4 is secured to an adjusting rod 5 which passes through the case 1. In one end of rod 5 is an adjusting screw 6, together with a lock nut 7. Adjusting screw 6 bears against a latch 7 which is pivoted on a stud 8 securely bolted to the case. Latch 7 is made to bear against adjusting screw 6 by the spring 8'. Latch 7 coacts with the catch 9 having a slot 10 at one end. The catch 9 turns about a pin which passes through the slot, said pin being'held in a partition 11. The pivoted member 12 of a switch turns about the pin 13 securely heldin partition 11" and's uitably insulated therefrom, said pin being connected to the heat supply circuit by wire 13. Switch member 12 supports insulated fiber piece 14 to which is pivoted the adjusting arm 15, said arm passing through and projecting beyond the case 1. The catch 9 is also pivoted to adjusting arm 15. A switch plate 16 is securely mounted to the case 1 and insulated there' from by a fiber piece 17. On this plate 16 is mounted the auxiliary switch spring 18,

19 in switch member 19. Into switch member 19 slides the pivoted switch member 12, first making contact when member 12 bears against the knob of spring 18. Plate 16 connects withthe supply circuit by wire 21.

When the switch is opened the knob on spring 18 follows in contact with switch member 12 until it separates from switch member 19 and is the last point of contact.

The case 1 is closed by the cover 22 to which is securely held a scale 23. Through the slot 24 of scale 23 passes adjusting arm 15. On the end of arm 15 is secured a knob or handle 25. Over the rod 15 and disposed inside the handle 25 is the spring 26. A sleeve 27 slides on the rod 15 and carries a pointer 27 which is urged against the scale by the spring 26. A portion-of the lower end of the sleeve 27 projects into the slot 2 1 of the scale 23, therebypreventing.

the sleeve 27 from rotating about the rod 15 and holding the pointer 27' in proper relation to the scale. The curve of the scale is approximately the curve lgenerated by a given point on the rod 15 when the rod -15 is oscillated from left to right. It should be noted that when the rod 15 .is swung either to the right or the left the pivot point between the catch 9 and the rod 15 moves in a straight line and the pivot point between the switch plate 12 and the rod 15 moves in" an are about the pivot point 13, thereby causing the curve to flatten out somewhat, as shown at the right hand end of the scale in Fig. IV. It will be clear, however, that a scale may be curved along different curves and the calibration of the scale changed accordingly.

When the against latch 7, (see Fig. IV) and as the temperature rises rod 1 expands thus raising latch 7. When the top of the rod reaches a given height, due to expansion of the rod,

the catch 9 is released and the switch is device is the heating coil 29, which may be in an oven or the like, which is opened or closed by the switch 30.

Having thus described my invention, what device is set, the catch 9 bears- I claim as new and desire to secure by Letters Patent is:

1. In an automatic thermostatic switch trip device, the combination with the thermostat rod, a pivoted latch lever to cooperate with said thermostat rod, a catch with a pivot disposed within a slot for adjustment to cooperate with said latch, a contact switch for closing the electric heating circuit, a setting lever pivoted thereto and pivotally connected to said adustable catch for regulating the position thereof to set the same to be released at a predetermined point, an actuating spring on said adjusting lever for putting tension on the said switch whereby it would be actuated when released, a suitable scale for accurately positioning the said setting lever, all coacting substantially as described for the purpose specified.

2. In an automatic thermostatic switch to said adjustable catch for regulating the osition thereof to set the same to be reeased at a predetermined point, an actuating spring on said adjusting lever for putting tension on the said switch whereby it would be actuated when released, a suitable scale for accurately positioning the said setting lever, all coacting substantially as described for the purpose specified.

3. In an automatic thermostatic switch trip device, the combination with the thermostat rod, a pivoted latch lever to cooperate with said thermostat rod, a catchwith a pivot disposed within a slot for adjustment to cooperate with said latch, a contact switch for closing the electric heating circuit, a setting lever pivoted thereto and pivotally connected to said adjustable catch for regulating the position thereof to set the same to be released at a predetermined point, an actuating spring on said adjusting lever for putting tension on the said switch whereby it would be actuated when released, all coacting substantially as described for the purpose specified.

In witness whereof, I have hereunto set my hand and seal in the presence of two witnesses. v

JESSE JACKSON. L. S.

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