US2436633A - Thermostatic switch for controlling electric circuits - Google Patents
Thermostatic switch for controlling electric circuits Download PDFInfo
- Publication number
- US2436633A US2436633A US563239A US56323944A US2436633A US 2436633 A US2436633 A US 2436633A US 563239 A US563239 A US 563239A US 56323944 A US56323944 A US 56323944A US 2436633 A US2436633 A US 2436633A
- Authority
- US
- United States
- Prior art keywords
- contacts
- switch
- electromagnet
- thermostatic switch
- metal
- 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
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
- H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
- H01H77/04—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrothermal opening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/02—Thread cutting; Automatic machines specially designed therefor on an external or internal cylindrical or conical surface, e.g. on recesses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/22—Feeding members carrying tools or work
- B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/64—Contacts
- H01H37/66—Magnetic reinforcement of contact pressure; Magnet causing snap action
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q2705/00—Driving working spindles or feeding members carrying tools or work
- B23Q2705/10—Feeding members carrying tools or work
- B23Q2705/18—Feeding other members supporting tools also feeding working spindles supports
- B23Q2705/182—Feeding other members supporting tools also feeding working spindles supports in lathes
Definitions
- This invention relates to thermostatic protective switches, for use in electricity distributing systems, and has for its object to provide improved switches of the kind adapted to open in the event of a fault or other condition causing an abnormal current to flow in a circuit containing the switch, and also adapted to be prevented from automatically reclosing.
- Figure 1 is a sectional side view of a switch mechanism embodying the invention
- Figure 2 is a diagram illustrating the electrical cnnections of the switch mechanism.
- an electromagnet d is secured in any convenient manner to a supporting plate 72 having a central aperture, and is enclosed by a sheet metal or other casing m having an open end secured to the supporting plate, the other end of the casing being closed.
- the electromagnet d comprises a yoke '0, a winding'e, and a spring loaded armature f, the latter having one end hingedly attached by a resilient metal strip 1) to the inner end of the yoke, and having a contact a on its other end.
- a bl-metal strip 0 which at one end is secured to a metal piece q, the other end of the bi-metal strip having mounted on it a contact b adapted to co-operate with the contact a.
- the ends of the electromagnet winding e are electrically connected to the metal piece q and the electromagnet yoke 0 respectively.
- the metal piece q is situated in part between and electrically insulated from one side of the electromagnet yoke o and a second metal piece 1, the latter being secured and electrically connected to the said yoke by screws 8 which also serve to secure the firstmentioned metal piece in position.
- a third metal piece it is secured by screws u to the other side of the electromagnet yoke 0, but is electrically insulated therefrom in any convenient manner.
- the second and third metal pieces r extend through the closed end of the casing m, and are provided at their outer ends with terminal screws 1) for connection to the circuit to be controlled.
- a push-pull switch 2' having a pair pair of complementary movable contacts r.
- the fixed contacts are respectively secured to the metal pieces q, t at positions near the supporting plate a, and are formed at their adjacent sides with V-shaped recesses 31 for accommodating of fixed contacts w and aiiti complementary parts of the movable contacts r.
- the latter are interconnected by a resilient metal bridge piece 2, and are operable by an axially movable stem 2 which passes through the central aperture in the supporting plate n and is provided at its outer end with a finger piece 3 made from insulating material.
- the finger piece 3 is formed with a tubular extension 4 which is slidable in a fixed tubular guide 5 on the supporting plate n.
- the stem 2 passes through a central hole in the bridge piece 2 and is surrounded by a pair of helical compression springs 6 through which movement can be imparted by the stem to the bridge piece for actuating the movable contacts 3:, one of the springs being situated between the bridge piece and the finger piece 3, and the other being situated between the bridge piece and a head 1 on the inner end of the stem.
- a pair of insulating pieces 8 Secured to the supporting plate 11 and situated between the latter and the fixed contacts w are a pair of insulating pieces 8 which at their adjacent sides are also formed with V-shaped recesses 9 for accommodating the movable contacts :r.
- the contacts a, b are normally closed, and when in this condition they short-circuit the electromagnet winding e which is of relatively high resistance.
- the con tacts a, b remain closed so long as normal conditions exist in the said circuit, but in the event of a short-circuit or other condition causing abnormal heating of the strip 0 the said contacts are separated, whereupon current flows through the Winding e and excites the electromagnet d.
- This causes rapid and complete separation of the contacts a, b and prevents reclosure thereof in consequence of the strip 0 cooling,
- the main switch 2 is opened.
- the electromagnet d then ceases to act, and the cooled strip 0 allows the contacts a, b, to come together again.
- the position of the contact b may be adjusted by a set screw l carried by the metal piece q and acting on the bi-metal strip 0.
- a thermostatic switch of the kind specified having in combination a pair of normally closed and independently movable contacts, a heat responsive device, and an electromagnet having its winding permanently connected across said contacts, one of said contacts being movable by said heat responsive device to cause separation of said contacts and the other contact bein arranged to be attracted and actuated by said electromagnet, so that in the event of separation of said contacts by said heat responsive device said contacts are held apart by said electromagnet.
- thermostatic switch as claimed in claim 1, in which the normally closed and independently movable contacts are respectively carried by a bi-metal strip forming the heat responsive device and by an armature forming a part of the electromagnet.
- a thermostatic switch as claimed in claim 1 and having in an electric circuit containing the normally closed and independently movable con tacts, a controlling push-pull switch, the two switches being formed as a unitary structure.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermally Actuated Switches (AREA)
- Control Of Direct Current Motors (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB16149/43A GB568714A (en) | 1943-10-01 | 1943-10-01 | Improvements relating to thermostatic switches for controlling electric circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
US2436633A true US2436633A (en) | 1948-02-24 |
Family
ID=10247399
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US563239A Expired - Lifetime US2436633A (en) | 1943-10-01 | 1944-11-13 | Thermostatic switch for controlling electric circuits |
Country Status (6)
Country | Link |
---|---|
US (1) | US2436633A (fr) |
BE (1) | BE461932A (fr) |
CH (1) | CH266751A (fr) |
DE (1) | DE856329C (fr) |
FR (1) | FR914648A (fr) |
GB (2) | GB568714A (fr) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2505691A (en) * | 1948-04-07 | 1950-04-25 | Richard F Spurck | Fractional horsepower motor and components thereof |
US2528777A (en) * | 1946-08-21 | 1950-11-07 | Mcquay Norris Mfg Co | Electromagnetic switching means |
US2539179A (en) * | 1946-10-21 | 1951-01-23 | Cav Ltd | Engine starting mechanism |
US2714859A (en) * | 1949-10-17 | 1955-08-09 | Claude C Klemme | Electrical apparatus, as for model railroads, including resonant relay and switches therefor |
US3633143A (en) * | 1967-10-16 | 1972-01-04 | Matsushita Electric Ind Co Ltd | Magnetically controlled thermal relay |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1038639B (de) * | 1955-10-21 | 1958-09-11 | Cav Ltd | Elektrischer Zug-Druck-Schalter |
DE1131785B (de) * | 1960-08-09 | 1962-06-20 | Licentia Gmbh | Thermischer Ausloeser fuer elektrische Schaltgeraete |
DE1201900B (de) * | 1962-08-17 | 1965-09-30 | Licentia Gmbh | Selbstschalter mit hoher Schaltleistung, insbesondere Installationsselbstschalter |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US29015A (en) * | 1860-07-03 | Improvement in apparatus for distilling sea-water | ||
US1336418A (en) * | 1917-01-26 | 1920-04-13 | Splitdorf Electrical Co | Circuit-controlling mechanism |
US1561240A (en) * | 1920-07-07 | 1925-11-10 | Westinghouse Electric & Mfg Co | Control apparatus |
US1564938A (en) * | 1922-04-29 | 1925-12-08 | Marshall Electric Company | Field regulator |
DE471946C (de) * | 1926-07-23 | 1929-10-30 | Bbc Brown Boveri & Cie | Magnetisch-thermisches UEberstromrelais |
US1763649A (en) * | 1929-03-05 | 1930-06-17 | William T Tassler | Electric switch |
US2087216A (en) * | 1934-08-31 | 1937-07-13 | Cons Gas Electric Light And Po | Relay device |
US2313969A (en) * | 1940-08-03 | 1943-03-16 | Micro Switch Corp | Control apparatus |
US2338731A (en) * | 1942-11-19 | 1944-01-11 | Gen Electric | Circuit controller |
-
1943
- 1943-10-01 GB GB16149/43A patent/GB568714A/en not_active Expired
-
1944
- 1944-10-06 GB GB4778/45A patent/GB576821A/en not_active Expired
- 1944-11-13 US US563239A patent/US2436633A/en not_active Expired - Lifetime
-
1945
- 1945-09-19 FR FR914648D patent/FR914648A/fr not_active Expired
- 1945-12-20 BE BE461932D patent/BE461932A/xx unknown
-
1947
- 1947-12-26 CH CH266751D patent/CH266751A/fr unknown
-
1950
- 1950-10-01 DE DEC2861A patent/DE856329C/de not_active Expired
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US29015A (en) * | 1860-07-03 | Improvement in apparatus for distilling sea-water | ||
US1336418A (en) * | 1917-01-26 | 1920-04-13 | Splitdorf Electrical Co | Circuit-controlling mechanism |
US1561240A (en) * | 1920-07-07 | 1925-11-10 | Westinghouse Electric & Mfg Co | Control apparatus |
US1564938A (en) * | 1922-04-29 | 1925-12-08 | Marshall Electric Company | Field regulator |
DE471946C (de) * | 1926-07-23 | 1929-10-30 | Bbc Brown Boveri & Cie | Magnetisch-thermisches UEberstromrelais |
US1763649A (en) * | 1929-03-05 | 1930-06-17 | William T Tassler | Electric switch |
US2087216A (en) * | 1934-08-31 | 1937-07-13 | Cons Gas Electric Light And Po | Relay device |
US2313969A (en) * | 1940-08-03 | 1943-03-16 | Micro Switch Corp | Control apparatus |
US2338731A (en) * | 1942-11-19 | 1944-01-11 | Gen Electric | Circuit controller |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2528777A (en) * | 1946-08-21 | 1950-11-07 | Mcquay Norris Mfg Co | Electromagnetic switching means |
US2539179A (en) * | 1946-10-21 | 1951-01-23 | Cav Ltd | Engine starting mechanism |
US2505691A (en) * | 1948-04-07 | 1950-04-25 | Richard F Spurck | Fractional horsepower motor and components thereof |
US2714859A (en) * | 1949-10-17 | 1955-08-09 | Claude C Klemme | Electrical apparatus, as for model railroads, including resonant relay and switches therefor |
US3633143A (en) * | 1967-10-16 | 1972-01-04 | Matsushita Electric Ind Co Ltd | Magnetically controlled thermal relay |
Also Published As
Publication number | Publication date |
---|---|
DE856329C (de) | 1952-11-20 |
GB576821A (en) | 1946-04-18 |
BE461932A (fr) | 1946-01-21 |
CH266751A (fr) | 1950-02-15 |
GB568714A (en) | 1945-04-17 |
FR914648A (fr) | 1946-10-14 |
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