US2887544A - Hygrostat - Google Patents

Hygrostat Download PDF

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US2887544A
US2887544A US563659A US56365956A US2887544A US 2887544 A US2887544 A US 2887544A US 563659 A US563659 A US 563659A US 56365956 A US56365956 A US 56365956A US 2887544 A US2887544 A US 2887544A
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casing
bar
hygrostat
duct
end wall
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Expired - Lifetime
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US563659A
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Gustavsson Bertil
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Svenska Flaktfabriken AB
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Svenska Flaktfabriken AB
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00—Investigating materials by mechanical methods
    • G01N19/10—Measuring moisture content, e.g. by measuring change in length of hygroscopic filament; Hygrometers

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  • the present invention relates to a novel and improved design of a hygrostat with two moisture responsive means consisting of bundles of hair or the like and impulse means for an outer circuit actuated by said responsive means and enclosed in a casing, one of the said responsive means being at its one end connected with a support that may be adjustable and is attached to said casing, and the other responsive means being at its corresponding end, within said casing, connected with said impulse means, while outside the casing the responsive means are each connected with one end of a lever resting on an edge at the end of a bar journalled in said casing.
  • the bar supporting said lever can be axially displaced by turning a nut engaging the end of the standard being located within said casing, which end is provided with a threaded portion and that the nut is turned by means of a knob arranged outside the casing and provided with a scale with graduation in degrees of relative humidity.
  • the invention makes it possible that the operation range of the hygrostat can easily be varied without any need of demounting the hygrostat or parts thereof.
  • the journalled portion of the bar has, at each side of the wall of said casing, a noncircular, preferably rectangular cross-section, which provides the most simple manner of guiding the bar during its movements.
  • reference numeral 1 designates a casing enclosing an impulse means which in the shown embodiment is a so called micro-switch 9.
  • Numerals 3 and 4 designate two moisture responsive means consisting of hair bundles or some other hygroscopic material.
  • the means 3 is at its one end connected with a support 3a that is resiliently attached to the casing 1 via a spring 2.
  • the corresponding end of the other moisture responsive means, 4 is fastened to a support 4a connected over the rod 8 with the impulse means 9.
  • the opposite ends, 3b and 411, respectively, of the moisture responsive means are attached to the one end of a lever 6 resting on an edge b at the top of a bar 5 the opposite end 5a of which is journaled and guided in the casing 1.
  • Numeral 7 designates a perforated protective envelope that could suitably be arranged round the moisture responsive means.
  • the end 5a of the bar has a threaded portion 11 engaging a nut 12.
  • the nut is secured to and can be rotated by means of a knob 13 having a scale of degrees 14.
  • Upon rotation of the nut 12 the bar 5 is moved axially against the action of spring whereby the desired operation range of the hygrostat can be adjusted.
  • the construction of the impulse means can be varied within the scope of the invention.
  • a hygrostat adapted to control the relative humidity of a gaseous medium flowing in a duct, comprising a casing mounted outside of said duct, an elongated bar threaded at one end within said casing and slidably mounted for longitudinal movement through one end wall of said casing and projecting therebeyond into said duct; an equalizing lever pivotally supported on the projecting end of said bar as a fulcrum; two sets of humidity responsive means, each set being connected at one end to said lever, extending within said duct substantially parallel to said bar, and terminating at the other end in a member extending through said one end wall into said casing; an adjustable support in said casing for one of said members; switch means supporting the other of said members and operated by said member in response to changes in relative humidity of the gaseous medium in said duct; an auxiliary circuit connected to said switch means to control the relative humidity of said medium; and means to longitudinally displace said elongated bar comprising a rotary element journalled for rotation in the opposite end
  • a hygrostat according to claim 1 wherein said elongated bar has a non-circular cross-section in the portion which projects through said one end wall of the casing, and wherein further said end wall is formed with a corresponding non-circular aperture to slidably support said bar against rotation.
  • a hygrostat adapted to control the relative humidity of a gaseous medium flowing in a duct, comprising a casing mounted outside of said duct, means in one end wall of said casing defining a rectangular aperture, an elongated bar threaded at one end within said casing, having a central portion of rectangular cross section slidably mounted for longitudinal movement through said aperture in the one end wall of said casing, and projecting therebeyond into said duct; a spring surrounding said bar within said casing and seated at one end against said one end wall and at the other end on said bar to bias said bar longitudinally toward the opposite end wall of the casing; an equalizing lever pivotally supported on the projecting end of said bar as a fulcrum; two sets of humidity-responsive means, each set being connected at one end to said lever, extending within said duct substantially parallel to said bar, and terminating at the other end in a member extending through said one end wall into said casing; an adjustable support in said casing for one of said members; switch

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
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Description

1959 B. GUSTAVSSON 2,887,544
' HYGROS'IAT Filed Feb. es, 1956 INVENY'OR BERTI L GUSTAVSSON United States Patent HYGROSTAT Bertil Gustavsson, Jonkoping, Sweden, assignor to A B Svenska Fliiktfabriken, Stockholm, Sweden Application February 6, 1956, Serial No. 563,659
Claims priority, application Sweden February 9, 1955 4 Claims. (Cl. 200--61.06)
The present invention relates to a novel and improved design of a hygrostat with two moisture responsive means consisting of bundles of hair or the like and impulse means for an outer circuit actuated by said responsive means and enclosed in a casing, one of the said responsive means being at its one end connected with a support that may be adjustable and is attached to said casing, and the other responsive means being at its corresponding end, within said casing, connected with said impulse means, while outside the casing the responsive means are each connected with one end of a lever resting on an edge at the end of a bar journalled in said casing. According to the characteristics of this invention the bar supporting said lever can be axially displaced by turning a nut engaging the end of the standard being located within said casing, which end is provided with a threaded portion and that the nut is turned by means of a knob arranged outside the casing and provided with a scale with graduation in degrees of relative humidity. The invention makes it possible that the operation range of the hygrostat can easily be varied without any need of demounting the hygrostat or parts thereof. According to a preferred embodiment of the invention, the journalled portion of the bar has, at each side of the wall of said casing, a noncircular, preferably rectangular cross-section, which provides the most simple manner of guiding the bar during its movements.
The invention will now be described more in detail with reference to the accompanying drawing, which illustrates an exemplifying embodiment of a hygrostat according to the invention.
In the drawing, reference numeral 1 designates a casing enclosing an impulse means which in the shown embodiment is a so called micro-switch 9. Numerals 3 and 4 designate two moisture responsive means consisting of hair bundles or some other hygroscopic material. The means 3 is at its one end connected with a support 3a that is resiliently attached to the casing 1 via a spring 2. The corresponding end of the other moisture responsive means, 4, is fastened to a support 4a connected over the rod 8 with the impulse means 9. The opposite ends, 3b and 411, respectively, of the moisture responsive means are attached to the one end of a lever 6 resting on an edge b at the top of a bar 5 the opposite end 5a of which is journaled and guided in the casing 1. Numeral 7 designates a perforated protective envelope that could suitably be arranged round the moisture responsive means. The end 5a of the bar has a threaded portion 11 engaging a nut 12. The nut is secured to and can be rotated by means of a knob 13 having a scale of degrees 14. Upon rotation of the nut 12 the bar 5 is moved axially against the action of spring whereby the desired operation range of the hygrostat can be adjusted. The construction of the impulse means can be varied within the scope of the invention.
What I claim is:
1. In a hygrostat adapted to control the relative humidity of a gaseous medium flowing in a duct, comprising a casing mounted outside of said duct, an elongated bar threaded at one end within said casing and slidably mounted for longitudinal movement through one end wall of said casing and projecting therebeyond into said duct; an equalizing lever pivotally supported on the projecting end of said bar as a fulcrum; two sets of humidity responsive means, each set being connected at one end to said lever, extending within said duct substantially parallel to said bar, and terminating at the other end in a member extending through said one end wall into said casing; an adjustable support in said casing for one of said members; switch means supporting the other of said members and operated by said member in response to changes in relative humidity of the gaseous medium in said duct; an auxiliary circuit connected to said switch means to control the relative humidity of said medium; and means to longitudinally displace said elongated bar comprising a rotary element journalled for rotation in the opposite end wall of said casing having a nut engaged with the threaded portion of said bar in said casing, and an actuating knob on said rotary element outside of said casing, said knob having a scale graduated in degrees of relative humidity.
2. A hygrostat according to claim 1 wherein said elongated bar has a non-circular cross-section in the portion which projects through said one end wall of the casing, and wherein further said end wall is formed with a corresponding non-circular aperture to slidably support said bar against rotation.
3. A hygrostat according to claim 2 wherein said noncircular cross-section is rectangular.
4. In a hygrostat adapted to control the relative humidity of a gaseous medium flowing in a duct, comprising a casing mounted outside of said duct, means in one end wall of said casing defining a rectangular aperture, an elongated bar threaded at one end within said casing, having a central portion of rectangular cross section slidably mounted for longitudinal movement through said aperture in the one end wall of said casing, and projecting therebeyond into said duct; a spring surrounding said bar within said casing and seated at one end against said one end wall and at the other end on said bar to bias said bar longitudinally toward the opposite end wall of the casing; an equalizing lever pivotally supported on the projecting end of said bar as a fulcrum; two sets of humidity-responsive means, each set being connected at one end to said lever, extending within said duct substantially parallel to said bar, and terminating at the other end in a member extending through said one end wall into said casing; an adjustable support in said casing for one of said members; switch means supporting the other of said members and operated by said member in response to changes in relatively humidity of the gaseous medium in said duct; an auxiliary circuit connected to said switch means to control the relative humidity of said medium; and means to longitudinally position said elongated bar against the bias of said spring comprising a rotary element journalled for rotation in said opposite end wall of said casing and having a nut engaged with the threaded portion of said bar in said casing, and an actuating knob on said rotary element outside of said casing, said knob having a scale graduated in degrees of relative humidity.
References Cited in the file of this patent UNITED STATES PATENTS 1,962,098 Zellhoefer June 5, 1934 1,998,340 Streb et al. Apr. 16, 1935 2,041,658 Hodge May 19, 1936 2,191,630 Shutts Feb. 27, 1940 2,503,273 Johnson Apr. 11, 1950 2,780,687 Keenan Feb. 5, 1957 FOREIGN PATENTS 112,184 Sweden Oct. 24, 1944 444,831 Great Britain Nov. 18, 1935
US563659A 1955-02-09 1956-02-06 Hygrostat Expired - Lifetime US2887544A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3034354A (en) * 1957-12-10 1962-05-15 Robertshaw Fulton Controls Co Humidity indicators and humidistats
US3115557A (en) * 1959-10-09 1963-12-24 Bendix Corp Humidistat adaptable for response to changes in relative or absolute humidity or function as a thermostat
US3143610A (en) * 1958-10-01 1964-08-04 Honeywell Regulator Co Moisture responsive control apparatus
US3163729A (en) * 1962-04-30 1964-12-29 Honeywell Inc Humidity control apparatus employing lever means to actuate a push button switch
US4050307A (en) * 1975-09-03 1977-09-27 The United States Of America As Represented By The Secretary Of The Army Dial humidity indicator for containers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1207586B (en) * 1959-03-19 1965-12-23 Dr Georg Bosian Method and device for the automatic regulation of the relative humidity and the temperature of a measuring room depending on the corresponding values of a comparison room
GB2161277A (en) * 1984-07-03 1986-01-08 Lucy & Co Ltd W Humidity sensor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1962098A (en) * 1932-07-25 1934-06-05 Williams Oil O Matic Heating Automatic control for air conditioning devices
US1998340A (en) * 1932-09-03 1935-04-16 Bendix Aviat Corp Hygrostat
GB444831A (en) * 1934-11-21 1936-03-30 Charles Laurence Burdick Improvements in recording hydrometers
US2041658A (en) * 1934-01-13 1936-05-19 Parks Cramer Co Hygroscopic controlling mechanism for an electric circuit
US2191630A (en) * 1937-06-17 1940-02-27 Gen Motors Corp Humidity compensated thermostat
US2503273A (en) * 1946-05-22 1950-04-11 Seymour J Johnson Wood element hygrostat
US2780687A (en) * 1954-05-07 1957-02-05 Bendix Aviat Corp Humidistat

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1962098A (en) * 1932-07-25 1934-06-05 Williams Oil O Matic Heating Automatic control for air conditioning devices
US1998340A (en) * 1932-09-03 1935-04-16 Bendix Aviat Corp Hygrostat
US2041658A (en) * 1934-01-13 1936-05-19 Parks Cramer Co Hygroscopic controlling mechanism for an electric circuit
GB444831A (en) * 1934-11-21 1936-03-30 Charles Laurence Burdick Improvements in recording hydrometers
US2191630A (en) * 1937-06-17 1940-02-27 Gen Motors Corp Humidity compensated thermostat
US2503273A (en) * 1946-05-22 1950-04-11 Seymour J Johnson Wood element hygrostat
US2780687A (en) * 1954-05-07 1957-02-05 Bendix Aviat Corp Humidistat

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3034354A (en) * 1957-12-10 1962-05-15 Robertshaw Fulton Controls Co Humidity indicators and humidistats
US3143610A (en) * 1958-10-01 1964-08-04 Honeywell Regulator Co Moisture responsive control apparatus
US3115557A (en) * 1959-10-09 1963-12-24 Bendix Corp Humidistat adaptable for response to changes in relative or absolute humidity or function as a thermostat
US3163729A (en) * 1962-04-30 1964-12-29 Honeywell Inc Humidity control apparatus employing lever means to actuate a push button switch
US4050307A (en) * 1975-09-03 1977-09-27 The United States Of America As Represented By The Secretary Of The Army Dial humidity indicator for containers

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