US1434633A

US1434633A - Thermostat and thermostatic control device

Info

Publication number: US1434633A
Application number: US388071A
Authority: US
Inventors: Even J Rohne
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-06-10
Filing date: 1920-06-10
Publication date: 1922-11-07
Anticipated expiration: 1939-11-07

Description

E. J. ROHNE. THERMOSTAT AND'THERMQSTATIC CONTROL DEVICE.

APPLICATION FILED JUNE 10, 1920.

Patented Nov. 7, 1922;

Patented Nov. 7, 1922.

UNITED STATES EVEN J. BOHNE, OF MINNEAPOLIS, MINNESOTA.

THEBMOBTAT AND 'IHERMOSTATIC CONTROL DEVICE.

Application filed June 10, 1920. Serial No. 388,071.

To all whom it may concern:

Be it known that I, Evan J. RonNa, a citizen of the United States, and a resident of Minneapolis in the county of Hcnnepin and State of Minnesota, have invented certain new and useful Improvements in Thermostats and Thermostatic Control Devices,

of which the following is a specification.

One object of my invention is to provide in a thermostat improved means for breaking a contact so as to provide a longer break. Another object is to provide improved means for controlling circuits in a heating device.

With these and incidental objects in view,

section taken on the line 2-2, Figure 1;v

Figure 3 is a plan view of a fiat iron with the cover removed, showing form of thermostat and my improved circuit; Figure 4 is a wiring diagram ofth device shown. in Figure 3.

As shown in the drawing, the frame 1 :is of general channel section, and

terminal blocks

2 and 3 are provided at each end thereof.

Headless screws 4 and 5 pass through the two terminal blocks and are clamped thereto by nuts 6.

Contact bars 7 and 8 are mounted loosely on the studs 4 and 5 through suitable apertures, and oppositely disposed arch-shaped thermostatic elements 8, 9, 10, i1, and 22 are similarly mounted on the studs 4 and 5 Contact screws 13, is, 15, and 16 are provided to co-operate with the contact bars 7 and 8 Springs 17 are provided for clamping the contact bars and thermostatic elements together.

it is apparent that as the thermostatic elements straighten out under increased temperature the contacts will be opened and numerous circuits may be controlled through the four contacts provided.

As the arch-shaped elements straighten out it is evident that a bigger break will be made at the contacts than if the action was controlled by a single thermostatic element.

a modified In the view shown in Figure 3 the flat iron 18 has a heating element 19 comprised of three separate circuits.

The thermostat comprises two thcrmo

static elements

20 and 21, of unequal length, and

contacts

22 and 23 are provided for the thermostatic elements.

In wiring up the circuit the outside connection would be made to studs 24 and 25, and one of the three coils of the heating element 19 would be permanently attached to these terminal posts.

One of the other coils would be attached from the ost 24 to the contact screw 22, and the third coil would be connected from the terminal post 24 to the contact screw 23.

This is better shown in Figure 4, in. which the outside circuit is represented b ccnductors 26. One coil 27 is connecte from the terminal post 24 to contact 22, the second coil 28 from the terminal ost 24 to the contact 23, and the third coil 29 is connected from the terminal post 24 to the terminal post 25, so as to be always in circuit when the flat iron is in use.

Inasmuch as the thermostatic elements are of different lengths, the contacts are naturally open at different degrees of temperature.

While I have illustrated it in one particu ar design, I do not wish it understood that I limit myself to this construction, as it isevident that the application of the invention may be varied in many ways within the scope of the following claims:

1. in a thermostat the combination of a iramc, two oppositely disposed terminal minal blocks, a plurality of oppositely disposed arch shaped thermostatic elements oosely carried by said studs, through. apertures-in said thermostatic elements, and contacts for said thermostatic elements, and resilient means for cl ampingsaid thermostatic elements together. v I

3. In a thermostat the combination of a frame, two oppositely disposed terminal i 85. described m'y inventimi and -'shaped thermostatic blocks, a plurality of oppositely disposed arch-shaped thermostatic elements, means carried by said terminal blocks for supporting said elements, and contacts for said thermostatic elements.

4. In a thermostat the combination of a frame, two oppositely disposed terminal blocks, studs connecting said terminal blocks,

contact bars loosely mounted on said studs, a plurality of oppositely disposed archelements loosely mounted on said studs intermediate of said contact bars, and a plurality of contact points carried by said terminal bars and with said contact bars. Y

6. The combination with a thermostat having a plurality of thermostatic elements of differing lengths, and a contact point for each of said elements, of a plurality of circuits, including heating coils, one of said circuits being connected across the direct terminals of said heating device, and the other of said circuits being connected on one side to one of the terminals of the heating device, and the other ends to said contacts whereby said heating coils will be controlled independently by the individual thermostatic elements. 1 J

EVEN J. ROHNE.

coacting,