US1416851A - Thermostatic regulating or controlling apparatus - Google Patents

Description

l A.. H.. McNEII.. THERMOSTATI'C REGULATING OFI CONTROLLING IIARTUS.

y APPLICATION FILED IML-23. 1918- Patented May 23, 1922.

2 mens-suur 1.

-A. H. McNEIL.

THERMOSTATIC REGULATING 0R CONTROLLING APPARATUS.

APPLICATION FILED IMI. 23, 1918.

Patented May 23, 1922.

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UNITED STATES lPATENT OFFICE.

ALFRED HENRY rreiinrnor enmarcan, ENGLAND.

THERMOSTATIC REGULATNG- OR CONTR-OLLING APPARATUS.`

Specification of Letters Patent. Pattgd 'Biggy 23, "1922.

Application Ied January 23, 1918. Serial No. 213,326.

Manatoin Victoria `Roa-d, Chingford, Es-

ser, England, here invented certain new and useful improvements in Thermostatic Regulating or Controlling- Apparatus, of

`which the followino is a s eciiication.

This invention relates to thermostatic regulating or controlling apparatus and has for its object to provide an improved apparatus capable of controlling fairly high temperatures ranging for example up to 1,000O F., such apparatus being applicable Tor a variety of uses including; the control of electrically heated induction pipes. of engines employed on aircraft, muilles or inutile fur-` naces and various electric, gas, hot water and other heatingl systems and apparatus.

The invention comprises an elongated thermo-sensitive member or tube fixed at one end and supporting by its other or free end a second elongated member to which longif tudinal movement is imparted due to the effects of changes of temperature on the elongated siuiporting member. such move-- ment being transmitted to an electric contact, valve, or other controlling` device. The invention also comprises electrical control.- ling means. l

According` to this invention a thermosensitive member consisting` of a tube or sleeve made of metal having a high co-e'ilicient of expansion is xed at one end and free atthe other end, anda rod or tube made oi metal or other material havinga lower co-eiiicient oi expansion is fixed at one end to the free end of thc metal tube and extends freely within the Atube in the direction of vthe liired end of the said tube where it operates on a movable electric contact, valve or other device.

electrical system of control co-operating with the thermo-sensitive device and designed to open and close a switch in the circuit of an electrical heating apparatus, includes a pivoted switch arm with controlling coil or relay, a pivoted locking arm for'the switch varm also with controlling coil, and electrical circuits controlled by a movable contact co-operating with two fixed contacts for energizingand (ie-energizing the coils. y

The switch is closed by the action of its coil upon the closing of. a circuit by the movable ycontact operated bythe thermosensitive member, and automatically locked in the closed position by the locking arm, the said switch 'being released and moved into the op'enposition under the action ot a spring by the closing of another circuit by the same contact member which is moved from the switch closing contact to a switch opening contact under the action of the thermo-sensitive device as the temperature rises.

In orderto prevent sparking the con-y trolling' circuits of both the switch arm and switch locking arm are broken automatically as soon as their coils have operated the said arms, by carbon contacts carried on and tact carried on the switch arm operating in the circuit of the locking rarm and the contact on the locking arm operating in the circuit of the switch arm, the locking arm being held up in the in-operative rposition by the switch arm, and moved into the locking position by a spring or other means when the switch is closed. Other means of controllingP the opening; and closing oit' the heating circuit by the thermo-sensitive device may be adopted. fin the case of gas heated apparatus the movable member of the thermostat may operate directly upon a valve for turning on or shutting off the supply.

Then the invention is applied to the induction ipe of an aircraft engine heated electrical y the pipe is provided with a chambered cap having-"a removable cover.

` lVithin the chamber is mounted a blade car- `moving with the arms themselves, the conrying an adjustable screw with pointer movi Vableover a dial and a movable contact arranged eccentrically of the screw and cooperating` with a fixed contact in the controlling circuit. l

In vthe accomp anying drawings z* Fig. l is a longitudinal section through an induction pipe fitted with a thermostatic device constructed according to the invention and also shown in section,

I Fie. 2 is a plan of the same with the cover removed,

And Figs. 3 and 4 are diagrams of electrical systems of control co-operating with the thermo-sensitive member.

Referring first to Figs. 1 and 2 which` `clearly illustrate the `thermostatic contact making or breaking device, a tube e of brass or other metal with a high co-efiicientl of vexpansion is iXed at one end only anden-

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