GB506843A - Means for indicating ice formation - Google Patents

Means for indicating ice formation

Info

Publication number
GB506843A
GB506843A GB108738A GB108738A GB506843A GB 506843 A GB506843 A GB 506843A GB 108738 A GB108738 A GB 108738A GB 108738 A GB108738 A GB 108738A GB 506843 A GB506843 A GB 506843A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
ice
contacts
lamp
armature
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
Application number
GB108738A
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
Priority to GB108738A priority Critical patent/GB506843A/en
Publication of GB506843A publication Critical patent/GB506843A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64DEQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D15/00De-icing or preventing icing on exterior surfaces of aircraft
    • B64D15/20Means for detecting icing or initiating de-icing

Abstract

506,843. Means for indicating the formation and preventing the accumulation of ice on aircraft surfaces. GOLDSCHMIDT, R. Jan. 12, 1938, No. 1087. [Class 4] Apparatus for indicating ice-formation on aircraft, comprises a movable member exposed to the atmosphere, means for normally maintaining the member in motion, and indicatng means responsive to an impediment to the motion of the member produced by ice forming thereon. In one form, Figs. 1 and 2, a diaphragm 1 is pulsated by an electromagnetic system comprising a U-shaped armature 4 carried by a plunger 3 fixed to the diaphragm, a yoke ring 7 mounted in a casing 2 and carrying pole pieces 6, and coils 8 surrounding the air gap between the pole pieces and the armature and maintained in position by springs 9 which also urge the armature away from the pole pieces. The coils 8 are periodically energized through a commutator unit 20, secured to the underside of a strap 11 secured to the casing and enclosed in a shield 22. The armature carries an insulated contact 12 co-operating with an insulated contact 13 carried by the strap 11, and its movement'is limited by studs 10 slidable in the strap. A second electromagnetic system comprises a U-shaped armature 14, Fig. 1, located at right-angles to the armature 4 and slidable on a reduced portion of the plunger 3 against a spring 15, a yoke 16 fixed to the plunger, and coils 17 maintained in position by a plate 25 and the springs 9. When the coils 17 are energized the armature is moved upwards and impacts a shoulder 18 on the plunger 3, which impact is transmitted to the diaphragm 1. As shown in Fig. 5, the commutator comprises an arm 23 which is moved over six fixed contacts 24 by a motors, 32 through reduction gearing. Five, of the contacts are connected together and through the coils 17 and a time switch 27 to one terminal of an electrical source 28, the other contact being connected through the coils 8 to the same terminal. The contacts 12, 13, an indicating lamp 31, a resistance 30 and the motor 32 are connected across the source 28 and a main switch 29. To set the indicator in operation, the switch 29 is closed and the arm rotates, thus closing the circuit of the coils 8 once per revolution and causing pulsation of the diaphragm. Short interruptions of the short circuit through the contacts 12, 13 do not cause the lamp to be noticeably illuminated. If ice accumulates on the diaphragm the contacts 12, 13 remain open and the lamp 31 lights up. The lamp may be arranged behind a frosted glass screen bearing the word " Ice " in clear glass. Instead of or in addition to the lamp, a relay, adapted to set de-icing apparatus in action, may be provided, the time constant of the relay being made of suitable length by the use of a condenser. The circuit may be arranged so that the lamp is lighted when the contacts remain closed. In order to de-ice the indicator, the switch 27 is closed and the coils 17 thus excited five times per revolution of the arm 23 to cause impacts to be delivered to the diaphragm which serve to break up and detach the ice. If de-icing apparatus is fitted to the aircraft, this may be used to device the indicator and the self-de-icer omitted. In another form, Fig. 6, the diaphragm 1 carries an armature 34 cooperating with an electromagnet 35 having an exciting coil 36. The terminals of the coil 36 are connected to a casing 37, one terminal being directly connected, and the other through a source of current 38, the energizing winding of a relay 39 for setting de-icing apparatus in action, an indicator lamp 40 and contacts 41, 42. The contact 41 is fixed to the casing and insulated therefrom and the contact 42 is fixed to the armature and electrically connected to the casing. The contacts 41, 42 are normally in engagement so that when the battery 38 is connected in circuit the diaphragm will be set in vibration, the contacts 41, 42 acting as a make and break switch. Under these conditions the current flowing is insufficient to light the lamp, but, when ice accumulates on the diaphragm, its amplitude of movement decreases, the current in the coil increases, the lamp lights and the relay is energized, the diaphragm being finally brought to rest with the contacts closed. Tode-ice the diaphragm, the contacts &c. are shorted by a switch 43 so that the armature is strongly attracted towards and impacts the electromagnet 35. The pulsatory movement of the movable member may be imparted by hydraulic, pneumatic or mechanical means, and the indicating means made responsive to an increase in the pressure or torque required. The moving member may be a rotating member. For example, the load on the shaft of an electric motor may be arranged to be increased by ice-formation, the increased current through the motor winding being utilized for indicating purposes. Instead of a lamp, aural indicating means may be used. According to the Provisional Specification, the diaphragm may be arranged to vibrate at an audible frequency so that ice-formation is indicated by a change in the note or cessation of sound. Also, the current through the indicator may he passed through the primary winding of a transformer so that an alternating voltage is developed in the secondary winding when the diaphragm is vibrating but falls to zero when the diaphragm ceases to vibrate. A plurality of indicators may be provided to indicate different thicknesses of ice.
GB108738A 1938-01-12 1938-01-12 Means for indicating ice formation Expired GB506843A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB108738A GB506843A (en) 1938-01-12 1938-01-12 Means for indicating ice formation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB108738A GB506843A (en) 1938-01-12 1938-01-12 Means for indicating ice formation

Publications (1)

Publication Number Publication Date
GB506843A true GB506843A (en) 1939-06-06

Family

ID=9715934

Family Applications (1)

Application Number Title Priority Date Filing Date
GB108738A Expired GB506843A (en) 1938-01-12 1938-01-12 Means for indicating ice formation

Country Status (1)

Country Link
GB (1) GB506843A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419454A (en) * 1943-01-26 1947-04-22 Clair Camille Clare Sprankl Le Apparatus for detecting and indicating and/or measuring ice formation on vehicles
US3091680A (en) * 1960-10-28 1963-05-28 Cook Electric Co Ice detector
US4553137A (en) * 1983-06-01 1985-11-12 Rosemount Inc. Non-intrusive ice detector
WO1985005185A1 (en) * 1984-05-03 1985-11-21 Rosemount Inc. Membrane type non-intrusive ice detector
US4570881A (en) * 1984-02-27 1986-02-18 Vibro-Meter Sa Process for detecting the likelihood of ice formation, ice warning system for carrying out the process and utilization thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419454A (en) * 1943-01-26 1947-04-22 Clair Camille Clare Sprankl Le Apparatus for detecting and indicating and/or measuring ice formation on vehicles
US3091680A (en) * 1960-10-28 1963-05-28 Cook Electric Co Ice detector
US4553137A (en) * 1983-06-01 1985-11-12 Rosemount Inc. Non-intrusive ice detector
US4570881A (en) * 1984-02-27 1986-02-18 Vibro-Meter Sa Process for detecting the likelihood of ice formation, ice warning system for carrying out the process and utilization thereof
WO1985005185A1 (en) * 1984-05-03 1985-11-21 Rosemount Inc. Membrane type non-intrusive ice detector
US4611492A (en) * 1984-05-03 1986-09-16 Rosemount Inc. Membrane type non-intrusive ice detector

Similar Documents

Publication Publication Date Title
GB506843A (en) Means for indicating ice formation
US2841745A (en) Electric speed governors
US2050665A (en) Electrical device
US1974409A (en) Electrical alarm clock
US2561481A (en) Alarm for deaf persons
US2494877A (en) Icing indicator
US2292775A (en) Flasher mechanism
US2282582A (en) Motor
US2552165A (en) Apparatus responsive to abnormally hot conditions in machines
GB346859A (en) Improvements in and relating to electrical contact making means specially applicable for use in conjunction with shaft revolution indicators and the like
US2327395A (en) Electromagnetic device
US1165082A (en) Speed-indicating mechanism.
US928021A (en) Signal system.
US1950987A (en) Display device
US1862773A (en) Railway signaling flasher
US1593282A (en) Signaling apparatus
US2118476A (en) Train signaling system
US2683872A (en) Electrically-actuated signaling device
GB710823A (en) Improvements relating to pendulums for electrical relays for code signaling systems
US2529082A (en) Electrically operated speedometer for automotive vehicles
US2694118A (en) Light flashing switch
US1877353A (en) Electromagnetic switch
GB166213A (en) Improvements in or relating to electro-magnetic devices for use with alternating currents
US2205655A (en) Electric circuit interruption
US629792A (en) Electric signal system.