US2369215A - Humidity-responsive switch - Google Patents

Humidity-responsive switch Download PDF

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Publication number
US2369215A
US2369215A US488707A US48870743A US2369215A US 2369215 A US2369215 A US 2369215A US 488707 A US488707 A US 488707A US 48870743 A US48870743 A US 48870743A US 2369215 A US2369215 A US 2369215A
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US
United States
Prior art keywords
receptacle
casing
magnet
humidity
strips
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
US488707A
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English (en)
Inventor
George W Crise
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.)
CRISE ELECTRIC Manufacturing Co
Original Assignee
CRISE ELECTRIC 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 DENDAT226629D priority Critical patent/DE226629C/de
Application filed by CRISE ELECTRIC Manufacturing Co filed Critical CRISE ELECTRIC Manufacturing Co
Priority to US488707A priority patent/US2369215A/en
Application granted granted Critical
Publication of US2369215A publication Critical patent/US2369215A/en
Priority to US582382A priority patent/US2444030A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B1/00—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values
    • G05B1/01—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric
    • G05B1/02—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric for comparing analogue signals
    • G05B1/025—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric for comparing analogue signals using inductance means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/42—Switches operated by change of humidity

Definitions

  • a simple and rugged humidostat wherein is embodied a novel motivating element in the form of an air permeable receptacle, the latter containing a body of water vapor absorbing material, such as a deliquescent salt, the receptacle being movably supported within the casing so that when its effective weight changes, as a result of the absorption or release of moisture by the absorbing material contained therein, the same will be caused to assume different operathe numeral l designates the casing of my improved humidostat.
  • This casing preferably comprises a base section 2 having a flat vertical rear surface to render the same suitable for applica tion to a room wall.
  • the casing includes a removable cover section 3 for the purpose of closing the mechanism disposed Within the internal chamber 4 of the .base section.
  • the base section is formed with screw-receiving recesses 5, the latter having arcuate walls 5.
  • the casing sections may be formed from any suitable molded plastic having insulating properties, such as Bakelite, Tenite or the like.
  • Fig. 1 is a iront elevational view of a humido-I ,phere.
  • the walls of the base section Adjacent to the bottom of the chamber 4, the walls of the base section are inwardly grooved as at I. These grooves are adapted to receive the ends of a bimetallic flexible strip 8, the latter being so formed that its central region will flex upwardly when the same is warmed.
  • a cylindrical receptacle H Positioned vertically in the chamber 4 and having the ends thereof suitably secured to the 'strips'8 and I0 is a cylindrical receptacle H, the
  • the receptacle is of such size that its vertical walls are disposed immediately adjacent to the arcuate walls 6, so that the latter may act as guides in the vertical movement of the receptacle in response to changes in its effective weight.
  • my humidostat is based on the fact that when the receptacle H is filled" with a desired moisture absorbent material, the efiective weight of the same changes rapidly withchanges in humidity of the surrounding air. When the relative humidity is high, the total weight of the receptacle including its contents is greater than when the humidity ratio is lower.
  • 3 Carried by the top of the bimetallic strip i0 is a circular disk-like magnet
  • This magnet is adapted to attract, and is arranged in vertical registration with, an armature Referring more particularly to the drawing, N which may partake oi. the form or an iron washer.
  • this washer is carried by the under side of a resilient metallic strip 15, the ends of the latter being disposed in grooves l formed in the upper end of the chamber 4.
  • the upper surface of the magnet 13 is provided with an upstanding contact in the form or a stud l1 and likewise the armature I4 is provided with a. complemental depending contact I8 01 post or studlike form.
  • Relative adjustment between the magnet and the armature may be effected by the provision of an adjusting screw IS.
  • the shank of this screw passes through a threaded bore provided in the upper end of the base section 2 of the casing and the lower end of the screw bears on the center region of the strip IS.
  • the upper end of the screw, which projects above the casing, has fastened thereto an adjustin knob 20, the perimeter of which may be suitably graduatedor calibrated for reference with a fixed index point to provide an external indication of the operative setting of the humidostat.
  • Th magnet i3 and the annature it are pro vided in order to permit the contacts i1 and In to handle a substantial current. That is, when the contacts are in engagement, the attraction of the magnet for the armature is at its greatest value, thus maintaining the contacts in close association and held so in spite of minor forces on the part of the receptacle which may tend to break such engagement and cause undesired fluctuation in the electric circuit associated with the humidostat.
  • the spring strips 8 and ID are of bimetallic construction.
  • the upper strip I0 has disposed in close proximity thereto, in a preferred form of the invention, a resistance wire 2
  • is of a mild character so that the electric circuit governed by the humidostat may remain closed for a desired interval of time. More rapid heating of the resistance 2
  • the lower strip 8 is also made of a corresponding bimetal construction and set Ior opposite flexing action. In this way.
  • the two bimetallic strips neutralize each other so far as room temperature is concerned. If it should be desired to increase or decrease humidity with the rise or fall of temperature, the resilient bimetallic strips may be made of difierent relative size or thickness.
  • a conductor 22 As shown in Fig. 2, current obtained from any suitable source, such as a commercial electric circuit, is conveyed by a conductor 22 to a terminal binding post 23 with which isv also connected one end of the resistance wire 2
  • a second conductor 24 extends from the source of current supply and leads to an electrical device or devices 25, theoperation of which the humidostat is employed to control. for example, the motor of a fan employed in forcing water vapor laden air to the room or rooms in Such, a device may comprisey which the htunidostat is disposed, or the device 25 may comprise an electrically actuated valve, control switch, or the like. From the device 25, the conductor 24 extends to a second terminal post 26, and from this post, a conductor 27 extends upwardly through the back of the base section 2 in order that its upper end may be connected with the strip IE or the armature Hi.
  • the present invention provides a humidostat in which the operating principle resides in the utilization of the change in weight of the moisture absorbent material contained in the receptacle ll to operate an electric switch.
  • the structure employed in accomplishing this end is simple, rugged and efllcient. If it should be desired to replace or repair parts, the removal of the cover section provides for complete accessibility, and by a sliding movement the internal parts may be readily moved into or out of position.
  • the receptacle II is mounted at its ends on bimetallic spring strips having flexing characteristics which are such as to prevent the temperature of the room atmosphere from effecting the operation of the receptacle.
  • the operation of the humidostat is stabilized with respect to the matter of maintaining the electric circuit associated with the switch in a positively closed condition, overcoming any tendency of the humidostat to set up a fluttering circuit operation.
  • the electric heater produces positive flexure of the bimetallic strip IO which, when heated to a desired degree, flexes with tension, so that when suflicient tension is developed, the magnet is separated from the armature with a snap action, preventing destructive arcing between the contacts I! and i3.
  • a humidity responsive switch comprising a casing, an air permeable receptacle containing a water vapor absorbing material mounted for movement in said casing, bimetallic strips having their flexible intermediate portions connected with said receptacle, said strips being of the character to neutralize the effect of variations in temperature on each other with respect to operational movement of said receptacle, and circuit completing and interrupting means actuated by movement of said receptacle in response to changes in its effective weight.
  • a humidity responsive switch comprising a casing, an air permeable receptacle containing a water vapor absorbing material, thermostatic means carried by the casing for the support of said receptacle, a magnet having a contact movable in unison with said receptacle, an armature mounted within said casing in registration with and in spaced relation from said magnet, a contact carried by said armature adapted to be i broughtdnto and out of engagement with the magnet contact, and means carried by said casing for regulating thev spacing between said armature and magnet.
  • a humidity responsive switch comprising a casing, a receptacle containing a water vapor absorbing medium, a pair or bimetallic strips supported at their ends within said casing and having their intermediate portions disposed in-conneonate tact with the ends oi said receptacle, one of said strips being adapted to flex downwardly and the other oi said strips upwardly when the same are warmed, whereby to neutralize the effects of room temperature variations on said receptacle, and circuit completing and interrupting means actuated by movement oi said receptacle in response to changes in its effective weight.
  • a humidity responsive switch comprising a casing, a receptacle containing a water vapor absorbing medium, spaced bimetallic strips supported at their ends within said casing, the intermediate portions of said strips being disposed in contact with the opposite ends of'said receptacle, one of said strips being of a character to flex downwardly when heated, and the other of said strips being adapted to flex upwardly when heated, means independent of room temperatures for locally heating one of said strips, a permanent magnet movable in unison with one of said strips, and an armature adjustably supported in said casing in appropriately spaced relation from said magnet, said magnet and armature being provided with registering circuit making and breaking contacts.
  • a humidity responsive switch c casing, a receptacie conta” carried by said casing for the app ceptacle through engager with ends thereof, a magnet hay g a con 0 mr in unison with said receptacle, an adjus mature mounted within said casing in regis a tion with said magnet, said armature being pro vided with a contact disposed for engagement with the contact of said magnet, and. eiectricaliy energized means for locally heating the resilient receptacle supporting means.
  • a humidity-responsive switch comprising a casing, a Water vapor absorbing element movably mounted in said casing, resilient thermostatic devices mounted in said casing to effect the support of said element by engagement with the opposite ends thereof, said devices serving to neutralize the effects of temperature variation with respect to each other in the support of said element, and circuit completing and interrupting means actuated by the movement of said element in accordance with changes in its efiective weight.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Adjustable Resistors (AREA)
  • Drying Of Gases (AREA)
US488707A 1943-05-27 1943-05-27 Humidity-responsive switch Expired - Lifetime US2369215A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DENDAT226629D DE226629C (enrdf_load_stackoverflow) 1943-05-27
US488707A US2369215A (en) 1943-05-27 1943-05-27 Humidity-responsive switch
US582382A US2444030A (en) 1943-05-27 1945-03-12 Humidity and temperature responsive device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US488707A US2369215A (en) 1943-05-27 1943-05-27 Humidity-responsive switch

Publications (1)

Publication Number Publication Date
US2369215A true US2369215A (en) 1945-02-13

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ID=23940786

Family Applications (1)

Application Number Title Priority Date Filing Date
US488707A Expired - Lifetime US2369215A (en) 1943-05-27 1943-05-27 Humidity-responsive switch

Country Status (2)

Country Link
US (1) US2369215A (enrdf_load_stackoverflow)
DE (1) DE226629C (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2444030A (en) * 1943-05-27 1948-06-29 Lyndon W Burch Humidity and temperature responsive device
US2682858A (en) * 1951-12-13 1954-07-06 James W Case Wood membrane hygrometer
US3441693A (en) * 1966-10-03 1969-04-29 Clinton O Bunn Vapor detecting device
US3808385A (en) * 1972-08-11 1974-04-30 G Klinefelter Moisture responsive switch actuator
US4582494A (en) * 1981-05-27 1986-04-15 Becnel Steven A Protected liquid-sensitive actuator for displacement responsive devices
US4970356A (en) * 1990-06-18 1990-11-13 Amos Gary T Rainfall responsive switch construction
FR2726650A1 (fr) * 1994-11-09 1996-05-10 Jpc Ets Detecteur mecanique de presence d'un corps

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2444030A (en) * 1943-05-27 1948-06-29 Lyndon W Burch Humidity and temperature responsive device
US2682858A (en) * 1951-12-13 1954-07-06 James W Case Wood membrane hygrometer
US3441693A (en) * 1966-10-03 1969-04-29 Clinton O Bunn Vapor detecting device
US3808385A (en) * 1972-08-11 1974-04-30 G Klinefelter Moisture responsive switch actuator
US4582494A (en) * 1981-05-27 1986-04-15 Becnel Steven A Protected liquid-sensitive actuator for displacement responsive devices
US4970356A (en) * 1990-06-18 1990-11-13 Amos Gary T Rainfall responsive switch construction
FR2726650A1 (fr) * 1994-11-09 1996-05-10 Jpc Ets Detecteur mecanique de presence d'un corps

Also Published As

Publication number Publication date
DE226629C (enrdf_load_stackoverflow)

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