US2249837A - Thermostat - Google Patents

Thermostat Download PDF

Info

Publication number
US2249837A
US2249837A US227076A US22707638A US2249837A US 2249837 A US2249837 A US 2249837A US 227076 A US227076 A US 227076A US 22707638 A US22707638 A US 22707638A US 2249837 A US2249837 A US 2249837A
Authority
US
United States
Prior art keywords
thermostat
central strip
bimetallic
bimetallic member
aperture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US227076A
Other languages
English (en)
Inventor
Paul R Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric and Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL59346D priority Critical patent/NL59346C/xx
Priority to BE435491D priority patent/BE435491A/xx
Application filed by Westinghouse Electric and Manufacturing Co filed Critical Westinghouse Electric and Manufacturing Co
Priority to US227076A priority patent/US2249837A/en
Priority to FR858201D priority patent/FR858201A/fr
Priority to GB22404/39A priority patent/GB531794A/en
Priority to CH211966D priority patent/CH211966A/fr
Application granted granted Critical
Publication of US2249837A publication Critical patent/US2249837A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • H01H37/5418—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting using cantilevered bimetallic snap elements
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/275—Control of temperature characterised by the use of electric means with sensing element expanding, contracting, or fusing in response to changes of temperature
    • G05D23/27535—Details of the sensing element
    • G05D23/2754—Details of the sensing element using bimetallic element

Definitions

  • An object of my invention is to provide a thermostat having a three-legged snap-acting bimetallic member anchored to a supporting structure by means of the center leg, whereby the operation of the bimetallic member is regulated through the adjustable movements of a cooperating stationary contact by varying the relative positions of thestationary contact with respect to the member, so as to vary the curvature of the intermediate leg.
  • Another object of my invention is to provide a method of mounting a bimetallic member in a thermostat which will permit the opening temperature of such member to be readily manually adjusted without afiecting the closing temperature of such member.
  • a further object of my invention is to elimihollow portion 28, a transversely positioned unnate any restraining action upon the bimetallic pointed out specifically in the course of the following description of a device embodying my invention, or will be apparent from such description.
  • FIGS 1 and 2 are, respectively, top and side elevational views of the devices embodying my invention
  • Fig. 3 is asectional view taken along the line III-Ill. of Fig. 1;
  • Figs. 4 and 5 are plan and perspective views of a bimetallic member for the devices embodying my invention
  • Fig. 6 is a perspective view of a modified form of the member shown in Figs. 4 and 5;
  • Fig. 7 is a side elevational view of the member shown in Fig. 5, partially mounted.
  • I show a thermostat [0 comprising a supporting structure or base l2, a bimetallic snap-acting thermal responsive member I4, a supporting rivet l6 for rigidly attaching the member H to the supporting structure I2, contact means including a movable contact I 8 and a stationary contact 20, a terminal bracket 2
  • the bimetallic member I4 is formed preferably from a single or unitary standard sheet of bimetallic material and preferably has the high expansion side thereof positioned on the upper side.
  • Two slots 30, in this instance substantially arcuate in shape, are located longitudinally within the member i4 and define a central strip and two exterior lateral strips 42.
  • the slots may be formed in the bimetallic sheet in any desired shape, and that, if desired, the bimetallic member may be otherwise fabricated from a plurality of elements.
  • a small circular aperture 32 is positioned substantially in line with two corresponding ends of the slots 30, and more particularly, substantially mid-way between such ends.
  • the bimetallic member ll after having the slots 30 and aperture 32 positioned therethrough, is bowed and heat-treated in such a manner that the central strip 40 is bowed outwardly and downwardly a greater amount than the exterior strips, with the high expansive side of the bimetallic member positioned on the upper surface.
  • the central strip is bowed outwardly with respect to the other strips.
  • the central strip will then be concave upwardly or convex downwardly.
  • the .bimetallic member is thus formed in such a manner so as to insure a snap-acting action of such member as it flexes from one operative position to another.
  • the rivet It comprises, in this instance, a centrally disposed enlarged portion 34, an upwardly extending shank 36 and a downwardly extending shank 38.
  • the upwardly extending shank 36 is adapted to extend through the aperture 25 of base l2, while the lower extending shank 38 is adapted to extend through the aperture 32 of the bimetallic member I4, so as to rigidly attach the member to the base i2.
  • the rivet l6 may be of any material desired. However, it is preferred that it be of such metal which will freely permit the ends of the shanks 35 and 33 to be spun over as hereinafter described.
  • the movable contact 3 is rigidly attached to the free end of the member l4, and, in this instance, is positioned upon the upper surface thereof.
  • the contact I8 is electrically associated with the member l4 to permit the passage of current therethrough.
  • the movable contact means l8 may be insulatedly attached to the member l4.
  • the stationary contact 20 is rigidly attached to or integral with the lower end of the adjusting screw 22 and is adapted to cooperate with the movable contact l8.
  • the adjusting screw 22 is threadedly attached to the base l2 through the cooperation of an internally threaded insert 28 which is rigidly attached to the base [2.
  • the lower shank portion 38 of rivet I 6 is positioned through the aperture 32 of bimetallic member l4, whereupon the main body portion 34 of the rivet will rest upon the upper surface of the bimetallic member. Inasmuch as the main body portion 34 is substantially larger than the aperture 32, it is obvious that such portion will extend a substantial distance into the central leg 40 for a purpose hereinafter described.
  • a washer 44 is then positioned upon the shank portion 38 against the lower surface of the bimetallic member'M, whereupon the lower end of the shank 38 is spun or riveted over tightly against the washer 44 to rigidly attach the bimetallic member to the rivet Hi.
  • the bimetallic member l4 and rivet 16 are then positioned within the inner hollow portion 26 of base l2 and the upper shank portion 36 of rivet I6 is inserted through the aperture 25 in the base 12.
  • is then positioned about the shank portion 36 and within the undercut portion 24 of base l2, whereupon the upper end of the shank 36 is welded or spun over tightly against the bracket substantially as shown at 46 in Fig. 3.
  • one lead of the circuit is connected to the angular terminal bracket 2
  • the second lead is inserted within a counter-bore 23 positioned within the upper end of the screw 22 and, say, soldered thereto.
  • the circuit through the thermostat is then substantially as follows: from the bracket 2
  • the central leg tends to change its curvature and, as the temperature of the member 14 reaches its predetermined opening temperature, finally does so change its curvature.
  • the central leg changes its curvature from concave upwardly to convex downwardly, the free end of member M will be moved downwardly with a snap action, causing the circuit therethrough to be broken.
  • the temperature of the member l4 will then decrease and, upon reaching the predetermined closing value, the bimetallic member will flex to a closed position, whereupon the contacts l8 and 20 will be reengaged and current will again be permitted to pass through the thermostat Ill and the controlled circuit.
  • adjusting screw 22 may be run out within the insert 28 so as to reduce the pressure on the free end of bimetallic member l4 and to reduce the tendency for the central strip to change its curvature.
  • the aperture 32. and rivet i6 are positioned upon the bimetallic member ll so as to extend into the central strip l0, inasmuch as it is desired to have the pressure applied by the adjusting screw 22 cause the curvature of the central strip 40 to change.
  • the pressure applied by the adjusting screw 22 will tend to bias the bimetallic member l4 downwardly as a cantilever beam from the rivet i6 as a fulcrum, without substantially afi'ecting the independent curvature of the central strip 40.
  • a thermostat comprising, in combination, a supporting structure, a bimetallic member having two slots therein defining a central strip, two exterior lateral strips and two end portions, there being an aperture partially within said central strip and partially within the adjacent end portion, and means inserted through said aperture and having a larger diameter than the aperture for directly cooperating with the central strip as distinguished from said exterior strips for rigidly attaching the member to the supporting structure.
  • a thermostat comprising, in combination, a supporting structure, a bimetallic member having two slots therein defining a central strip, two exterior lateral strips and two end portions, there being an aperture partially within said central strip and partially within the adjacent end portion, means inserted through said aperture and thereby directly cooperating with the central strip as distinguished from said exterior strips for rigidly attaching the member to the supporting structure, and means operatively associated with the member for adjusting the opening temperature of such member.
  • a thermostat comprising, in combination, a supporting structure, a bimetallic member having two slots therein defining a central strip and two exterior lateral strips, means directly cooperating with the central strip as distinguished from said exterior strips for rigidly attaching the member to the supporting structure, and means operatively associated with the member for changing the curvature of the central strip while the thermostat is in a closed position only for adjusting the opening temperature of the thermostat without substantially efi'ecting a-change in the closing temperature thereof.
  • a thermostat comprising, in combination, a supporting structure, a bimetallic member having two slots therein defining a central strip and two exterior lateral strips, a supporting rivet for rigidly attaching the member to the structure by direct cooperation with the central strip as distinguished from said exterior strips, contact means including at least one movable contact attached to the free end of the member and one stationary cooperating contact, an adjusting screw associated with the stationary contact, and means including the movements of the screw for changing the curvature of the central stripto adjust the opening temperature of the thermostat without substantially efl'ecting a change in the closing temperature thereof.
  • a thermostat comprising, in combination, a
  • supporting structure a bimetallic member having two slots therein defining a central strip and two exterior lateral strips, a supporting rivet extend-.
  • a thermostat comprising, in combination, a supporting structure, a snap-acting bimetallic member having two slots therein defining a central and two exterior lateral slots, and an aperture located substantially in line with corresponding ends of the slots, a supporting rivet extending through the aperture and cooperating with the structure for rigidly attaching the member to the structure by direct cooperation with the central strip as distinguished from the exterior strips, contact means including a movable contact attached to the free end of the member and a stationary cooperating contact, an adjusting screw carrying the stationary contact, and means including said screw and movable contact for changing the curvature of the central strip while the thermostat is in a closed position only for adjusting the opening temperature of the thermostat without substantially eilfectlng a change in the closing temperature thereof.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
US227076A 1938-08-27 1938-08-27 Thermostat Expired - Lifetime US2249837A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL59346D NL59346C (fr) 1938-08-27
BE435491D BE435491A (fr) 1938-08-27
US227076A US2249837A (en) 1938-08-27 1938-08-27 Thermostat
FR858201D FR858201A (fr) 1938-08-27 1939-07-24 Thermostats
GB22404/39A GB531794A (en) 1938-08-27 1939-08-02 Improvements in or relating to thermostats
CH211966D CH211966A (fr) 1938-08-27 1939-08-24 Thermostat.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US227076A US2249837A (en) 1938-08-27 1938-08-27 Thermostat

Publications (1)

Publication Number Publication Date
US2249837A true US2249837A (en) 1941-07-22

Family

ID=22851653

Family Applications (1)

Application Number Title Priority Date Filing Date
US227076A Expired - Lifetime US2249837A (en) 1938-08-27 1938-08-27 Thermostat

Country Status (6)

Country Link
US (1) US2249837A (fr)
BE (1) BE435491A (fr)
CH (1) CH211966A (fr)
FR (1) FR858201A (fr)
GB (1) GB531794A (fr)
NL (1) NL59346C (fr)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425717A (en) * 1942-06-25 1947-08-19 F A Smith Mfg Company Thermostatic switch assembly
US2479313A (en) * 1947-07-29 1949-08-16 Gen Electric Column spring switch
US2533274A (en) * 1944-11-28 1950-12-12 Fasco Industries Bimetallic thermostatic element
US2616996A (en) * 1947-12-06 1952-11-04 Beeman Lyle Snap switch
US2669618A (en) * 1950-03-04 1954-02-16 Sessions Clock Co Snap-action device
US2681962A (en) * 1951-07-02 1954-06-22 Sundt Edward Victor Combined circuit breaker and switch
US2684843A (en) * 1950-05-16 1954-07-27 Mason Electric Corp Snap action device
US2712045A (en) * 1953-08-18 1955-06-28 Signal Stat Corp Snap action vane
US2712044A (en) * 1953-08-18 1955-06-28 Signal Stat Corp Circuit breaker
US3037102A (en) * 1961-02-06 1962-05-29 Schmidinger Joseph Snap switch
US3061694A (en) * 1959-05-21 1962-10-30 Hubbell Inc Harvey Leaf type snap action switch
US3130585A (en) * 1957-04-25 1964-04-28 Sunbeam Corp Snap-acting thermostat
US3130990A (en) * 1961-09-11 1964-04-28 Rohden Mfg Company Inc Knob spring
US3451270A (en) * 1966-11-14 1969-06-24 Gen Motors Corp Thermostatic vacuum valve and bimetal element therein
US4283701A (en) * 1979-04-20 1981-08-11 General Electric Company Overshoot compensated thermostat
EP1372174A1 (fr) * 2001-03-02 2003-12-17 Uchiya Thermostat Co., Ltd. Protecteur thermique
US20050134424A1 (en) * 2003-12-19 2005-06-23 Albert Huang Bimetallic strip for a circuit breaker
DE102009025221A1 (de) * 2009-06-05 2010-12-16 Hofsaess, Marcel P. Bimetallteil und damit ausgestattete temperaturabhängige Schalter
US9355801B2 (en) 2009-06-05 2016-05-31 Marcel P. HOFSAESS Bimetal part and temperature-dependent switch equipped therewith

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE947276C (de) * 1952-02-05 1956-08-16 Rau Fa G Thermobimetallband
DE3711666A1 (de) * 1987-04-07 1988-10-27 Hofsass P Temperaturschalter
JP2001506146A (ja) 1996-12-13 2001-05-15 データ サイエスシズ インターナショナル，インコーポレイティド ポリウレタン表面を有する生物適合性医用装置

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425717A (en) * 1942-06-25 1947-08-19 F A Smith Mfg Company Thermostatic switch assembly
US2533274A (en) * 1944-11-28 1950-12-12 Fasco Industries Bimetallic thermostatic element
US2479313A (en) * 1947-07-29 1949-08-16 Gen Electric Column spring switch
US2616996A (en) * 1947-12-06 1952-11-04 Beeman Lyle Snap switch
US2669618A (en) * 1950-03-04 1954-02-16 Sessions Clock Co Snap-action device
US2684843A (en) * 1950-05-16 1954-07-27 Mason Electric Corp Snap action device
US2681962A (en) * 1951-07-02 1954-06-22 Sundt Edward Victor Combined circuit breaker and switch
US2712045A (en) * 1953-08-18 1955-06-28 Signal Stat Corp Snap action vane
US2712044A (en) * 1953-08-18 1955-06-28 Signal Stat Corp Circuit breaker
US3130585A (en) * 1957-04-25 1964-04-28 Sunbeam Corp Snap-acting thermostat
US3061694A (en) * 1959-05-21 1962-10-30 Hubbell Inc Harvey Leaf type snap action switch
US3037102A (en) * 1961-02-06 1962-05-29 Schmidinger Joseph Snap switch
US3130990A (en) * 1961-09-11 1964-04-28 Rohden Mfg Company Inc Knob spring
US3451270A (en) * 1966-11-14 1969-06-24 Gen Motors Corp Thermostatic vacuum valve and bimetal element therein
US4283701A (en) * 1979-04-20 1981-08-11 General Electric Company Overshoot compensated thermostat
EP1372174A1 (fr) * 2001-03-02 2003-12-17 Uchiya Thermostat Co., Ltd. Protecteur thermique
US20040075526A1 (en) * 2001-03-02 2004-04-22 Hideaki Takeda Thermal protector
EP1372174A4 (fr) * 2001-03-02 2005-03-09 Uchiya Thermostat Protecteur thermique
US7026907B2 (en) 2001-03-02 2006-04-11 Uchiya Thermostat Co., Ltd. Thermal protector
US20050134424A1 (en) * 2003-12-19 2005-06-23 Albert Huang Bimetallic strip for a circuit breaker
DE102009025221A1 (de) * 2009-06-05 2010-12-16 Hofsaess, Marcel P. Bimetallteil und damit ausgestattete temperaturabhängige Schalter
US9355801B2 (en) 2009-06-05 2016-05-31 Marcel P. HOFSAESS Bimetal part and temperature-dependent switch equipped therewith

Also Published As

Publication number Publication date
FR858201A (fr) 1940-11-20
BE435491A (fr)
GB531794A (en) 1941-01-10
CH211966A (fr) 1940-10-31
NL59346C (fr)

Similar Documents

Publication Publication Date Title
US2249837A (en) Thermostat
USRE24023E (en) Schmidinger
US3164701A (en) Method of assembling thermostatic switches
US2199638A (en) Thermostat
US2299562A (en) Snap acting device and method of making the same
US2008163A (en) Thermostatic switch
US2768263A (en) Switch mechanism
US4224488A (en) Electrical switch devices
US1834375A (en) Close control thermostat
US2085557A (en) Control device
US3293394A (en) Temperature responsive control device with snap acting switch
US5548266A (en) Thermostat construction
US2289095A (en) Bimetallic link mounting
US2487684A (en) Snap-acting springing and thermostatic plate
US2320873A (en) Thermostat
US2720568A (en) Snap-acting bimetallic thermostat
US2011610A (en) Thermal switch
US2896041A (en) Switch
US2210701A (en) Thermostat
US2740864A (en) Precision thermostatic switch
US2988621A (en) Thermoresponsive snap action switch
US2340056A (en) Thermostat
US2264988A (en) Mounting of bimetallic elements
US2819365A (en) Snap-acting thermostat and mounting therefor
US2487683A (en) Snap-acting springing and thermostatic plate