[go: up one dir, main page]

US1769126A - Time-limit switch for electric-light installations - Google Patents

Time-limit switch for electric-light installations Download PDF

Info

Publication number
US1769126A
US1769126A US348390A US34839029A US1769126A US 1769126 A US1769126 A US 1769126A US 348390 A US348390 A US 348390A US 34839029 A US34839029 A US 34839029A US 1769126 A US1769126 A US 1769126A
Authority
US
United States
Prior art keywords
thermostat
contact
time
limit switch
electric
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
US348390A
Other languages
English (en)
Inventor
Fagerlund Erik Artur
Lofgren Karl Einar Rupert
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US1769126A publication Critical patent/US1769126A/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
    • H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
    • H01H43/30—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action
    • H01H43/301—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action based on the expansion or contraction of a material
    • H01H43/302—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action based on the expansion or contraction of a material of solid bodies
    • H01H43/303—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action based on the expansion or contraction of a material of solid bodies of one single solid body, e.g. hot wire

Definitions

  • the invention relates to improvements in formerly used time-limit switches of this type and an object of the invention is to procure a time-limit switch, in which the movement 5 necessary for opening and closing the contacts in a simple and eliicient way is obtained by the direct use of such variations of the length of the thermostat itself, which are due to variations of the temperature.
  • a time-limit switch in which the movement 5 necessary for opening and closing the contacts in a simple and eliicient way is obtained by the direct use of such variations of the length of the thermostat itself, which are due to variations of the temperature.
  • Formerly 0 such variations of length have been designed to move the contactelement by means of a system of levers, but according to this invention the mechanism for moving the contacts in accordance with the length variations simply consists in the thermostat itself, one
  • F ig. 1 shows a front view of the apparatus, the cover hobos removed in order to show the electrical connections.
  • Fig. 2 shows a longitudinal section.
  • the elongating element of the thermostat consists of a rod 1 arranged as shown inside a tube 3 and surrounded by a coil 2, insulated from both the rod and the tube.
  • the lower end of the rod is connected to the tube by means of an insulating support 4k and nuts 5.
  • the rod and the tube are preferably made of the same metal and the latter is provided with contacts 6, 7, each mounted on a spring 61. The movement of said springs outwardly from the tube is limited by means of stop hooks 71.
  • the rod 1 by means of nuts l1 is connected to a fixed strap 9, the tube 3 being pivotally connected to said strap by means of a pin 8 as shown on the side of the centre line of thek rod.
  • an arm 10 To the tube 3 there is rigidly connected an arm 10, the free endof which is pressed down by a spring 12, the force of the spring tending to turn the lower end of the tube to the right of Fig. 1.
  • the contact 6 is in contact with a contact member 13 arranged on the contact fixture 14. Directly above these contacts 6, 13 there is a coil 18 having an iron core 19 for arc-blow-out when opening the circuit 20.
  • This circuit 20 is conducted through the coil 2 around rod 1, said coil being connected in series with coil 18.
  • the contact 7 co-acts with another contact 21, fixed on a screw 22 arranged on a fixture 23. Said screw 22 against the action of a spring 221 may be ad]usted by means of the insulating knob 24.
  • the main circuit 20-25 also comprises a condenser for arc-blow-out when opening ⁇ contacts 7, 21.
  • the contact fixture 23 is c-onnected kto the main circuit -25, which con tains the lamps 26.
  • Both circuits 20, 20-25 are connected to the battery 27, said battery by means of pin 8 and tube 3 being in electrical connection with contacts 6, 7.
  • the heating circuit 2() of the thermostat is closed by means of one of the switches 28, the coil 2 receives an impulse of current, causing rod 1 to become quickly heated, owing to which the rod will become elongated instantly. This will cause the lower part of the thermostat to swing to the right, thereby closing contacts 7, 21 and the main circuit 20-25, containing the lamps 26.
  • the initial part of said movement of the thermostat to the right causes the circuit 20 to be opened.
  • the heattio ing also causes elongation of tube 3, but as the rod is situated inside ot the Whole Construction, the elongating of the same will dominate, and at the same time the subsequent cooling et the rod will be retarded, thus causing the circuit or" the lamps to remain closed during' a certain space ottime.
  • the spring l2 is stretched out and the lower part of tube 3 :avung bach to the lett to such a degree, that spring G1 on the right side ceased to tliei"eb ⁇ v causing contact T to leave contact 2l.
  • rl ⁇ he lamp circuit is then opened and shortl;T afterwards the contacts, (i, 13 become closed and the apparatus may be ready for another operation as described above.
  • the space et time during which contacts T, 2l remain clos-ed and consequently the lamjs ivill continue to giov', may bcontrolled by operating the screvv 22.
  • the tube 3 acts as a screen preventing' the. heat rays emanating trom rod l. from escaping to the outside, a feature vwhich will serve a constant resistance o the cooling of the rod.
  • a timelimit switch in combination, thermostat, a metal tube surrounding said thermostat, means Jfor connecting one end o said metal tube to one end of said thermostat, contact pieces secured to said end of said metal tuber ⁇ contact piece co-acting With one ot said contact pieces tor closing an electric circuit for heating said thermostat and opening the same when the thermostat is heated, another contact piece co-acting with the other of said contact pieces for closing an electric circuit for lighting a s vstem of lamps ivhen said heating circuit is opened, and means tor pivotally connecting said metal tube to a lined pin.
  • a time-limit switch in combination, a thermostat, a pivoted member disposed in parallel relation to said thermostat and having one entr connected to one end ot the thermostat, contact pieces secured to said end of said member, a contact piece co-acting with one ot said contact pieces tor closing an electric circuit for heating said thermostat and opening the same when the thermostat is heated, and another contact piece co-acting with the other of said first contact pieces for closing an electric circuit lor lighting a system of lamps when said heating circuit is opened.
  • a thermostat in combination, a thermostat, a pivoted member disposed in parallel relation to said thermostat and having one end connected to one end of the ther niostat, contact members flexibly supported en said member at opposite sides thereof, a contact member adapted to cooperate with one of said contact members for closing an electric circuit through said thermostat thereby to heat the same, and a second contact member adapted to cooperate ⁇ with the other flexibly supported contact member for closing a circuit through a lighting system, said last coo ⁇ .:erating c ntact member being adjustable relative to its cooperating member.

Landscapes

  • Thermally Actuated Switches (AREA)
US348390A 1927-03-22 1929-03-20 Time-limit switch for electric-light installations Expired - Lifetime US1769126A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1769126X 1927-03-22

Publications (1)

Publication Number Publication Date
US1769126A true US1769126A (en) 1930-07-01

Family

ID=7742495

Family Applications (1)

Application Number Title Priority Date Filing Date
US348390A Expired - Lifetime US1769126A (en) 1927-03-22 1929-03-20 Time-limit switch for electric-light installations

Country Status (5)

Country Link
US (1) US1769126A (pt)
BE (1) BE362613A (pt)
CH (1) CH142859A (pt)
FR (1) FR672389A (pt)
NL (1) NL25291C (pt)

Also Published As

Publication number Publication date
FR672389A (fr) 1929-12-27
BE362613A (pt)
NL25291C (pt)
CH142859A (de) 1930-10-15

Similar Documents

Publication Publication Date Title
US2276930A (en) Oven heating system
US1769126A (en) Time-limit switch for electric-light installations
US1816055A (en) Drier
US2753432A (en) Electrical apparatus
US1290928A (en) Thermo circuit-closer.
US2786990A (en) Control and indicating system for electric heating means
US2310543A (en) Domestic appliance
US2039193A (en) Photographic apparatus
US1930435A (en) Mercury switch
US1680732A (en) Control apparatus
US1627732A (en) Thermostatic control for electric ovens and the like
US2778913A (en) Temperature control and signal circuit
US1886477A (en) Electric switch
US2322162A (en) Control arrangement for signal devices
US2086709A (en) Delayed action switch
US1962587A (en) Thermostatic contact mechanism
US1757986A (en) Thermostatic control for electrically-heated apparatus
US1677334A (en) Thermostatic overload switch
US1920538A (en) Switching mechanism
US1675401A (en) Combined holder and automatic circuit breaker for electric soldering irons
US1593638A (en) Controlling device for electric flatirons
US1818563A (en) Thermostatic device
US1303196A (en) gordon
US1687230A (en) Thermostat
US2088160A (en) Brooder control