GB2043764A - Temperature responsive control device - Google Patents
Temperature responsive control device Download PDFInfo
- Publication number
- GB2043764A GB2043764A GB8003023A GB8003023A GB2043764A GB 2043764 A GB2043764 A GB 2043764A GB 8003023 A GB8003023 A GB 8003023A GB 8003023 A GB8003023 A GB 8003023A GB 2043764 A GB2043764 A GB 2043764A
- Authority
- GB
- United Kingdom
- Prior art keywords
- control device
- responsive control
- pivot
- tube
- operating means
- 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.)
- Granted
Links
- 230000007704 transition Effects 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims description 4
- 238000013016 damping Methods 0.000 claims description 3
- 230000003446 memory effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 5
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F1/00—Closers or openers for wings, not otherwise provided for in this subclass
- E05F1/002—Closers or openers for wings, not otherwise provided for in this subclass controlled by automatically acting means
- E05F1/004—Closers or openers for wings, not otherwise provided for in this subclass controlled by automatically acting means by thermostats, rain, wind or noise
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
- A01G9/241—Arrangement of opening or closing systems for windows and ventilation panels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K5/00—Measuring temperature based on the expansion or contraction of a material
- G01K5/48—Measuring temperature based on the expansion or contraction of a material the material being a solid
- G01K5/483—Measuring temperature based on the expansion or contraction of a material the material being a solid using materials with a configuration memory, e.g. Ni-Ti alloys
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2201/00—Constructional elements; Accessories therefor
- E05Y2201/40—Motors; Magnets; Springs; Weights; Accessories therefor
- E05Y2201/43—Motors
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2800/00—Details, accessories and auxiliary operations not otherwise provided for
- E05Y2800/67—Materials; Strength alteration thereof
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
- E05Y2900/11—Application of doors, windows, wings or fittings thereof for buildings or parts thereof for industrial buildings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Air-Flow Control Members (AREA)
Abstract
A temperature responsive control device such as may be fitted to a ventilator for a greenhouse comprising two pivoted members 1, 11 one of which (1) supports a load and operating means including an SME (Shape Memory Effect) element which changes its shape within a transition temperature range to cause the member which supports the load to pivot with respect to the other member. The SME element may be in the form of a coil spring 45 surrounding a damper mechanism 37, 53. When the temperature rises, the spring 45 applies a force to the spring seat 49 and a thrust pivot 55 to move one of the two pivoted members (11) about its pivot pin 9 to open the ventilator. <IMAGE>
Description
SPECIFICATION
Temperature responsive control devices
This invention relates to temperature responsive control devices and more particularly to such devices which employ an SME element.
In this specification an SME element is a shape memory effect element which is an element of a material, usually an alloy, having an elastic modulus which varies significantly with temperature in a reversible manner over a transition temperature range dependent on the material employed. There are a number of known alloys which display shape memory effect when subject two a pre-conditioning heat treatment. A suitable alloy is one having a composition by weight of the order of copper 70%, aluminium 4% and zinc 26%. Above and below the transition temperature range, change of temperature has no appreciable effect on the thermal properties of the material. In the transition range, however, increase in temperature results in progressive increase in the elastic modulus, and hence in decrease in the strain of the stress element.
According to the present invention, a temperature responsive control device comprises a first member, a second member pivotally secured to the first member and pivotable between first and second operating positions, said second member providing a support for a load, operating means including an
SME element, as hereinbefore defined, said element having an initial shape at temperatures above a transition temperature range and a distorted shape at temperatures below the transition temperature range, said operating means being connected to the second member at a position away from the pivot and to the first member, the operating means being such that at temperatures below the transition range the second member is in its first operating position and at temperatures within the transition range the element tries to revert to its initial shape and pivots the second member to its second operating position, and means for adjusting the position on the second
member, relative to the pivot of the position of the application of the load and/or the position of the connection of the operating means.
The SME element is conveniently distorted to a
shape in the form of a coil spring and it remains in this condition below the transition temperature
range. At a temperature within this range, however, the element tends to revert to its initial shape. Below the transition temperature range, the second
member is in its first operating position. Within the
transition temperature range the element tries to
revert to is initial shape and eventually causes the
second member to pivot into its second position and
thereby move the load.
It is difficult to manufacture SME elements having
an exact transition temperature because of the extreme temperature sensitivity of the material dependent upon its chemical composition. In order to be able to calibrate the temperature responsive control device, means are provided for adjusting the load which the element has to overcome when it tries to revert from its distorted shape. This adjustment is brought about by either enabling the position of the application of the load on the second member relative to the pivot to be adjusted or by arranging for the position on the second member, relative to the pivot, of the position of the application of the operating means to be adjusted. Alternatively, the position on the second member relative to the pivot of both the application of the load and the application of the operating means may be adjustable.
In order that the invention may be more readily understood it will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a sectional side elevation of a temperature responsive control device in accordance with one embodiment of the invention, and
Figure 2 is a sectional side elevation of operating means shown in Figure 1.
A control device suitable for opening and closing a ventilator, such as is found in a greenhouse, comprises a first member 1 of folded metal and having a pair of generally triangular side portions 3 joined together by a base portion 5. At one end of the side portions 3 there are means 7 by which the member can be secured to another member. At the opposite ends ofthe side portions there is a pin 9 extending between the side portions and at right angles thereto. A second member 11, having a pair of side portions 13 joined together by a portion 15 at right angles thereto, is pivotally mounted on the pin 9 and the side portions 13 provide a mounting 17 for a load. The second member 11 thus fits over the member 1 and is pivotable about the pin 9. A second member 11 has a back cover 19 which fits between, and is secured to, the side portions 13.The lower edge 21 of the back cover is turned inwardly. An elongate slot 23 is provided in the back cover and an adjustment plate 25, located on the outside of the back cover, has a prong 27 which projects into the slot. A U-shaped thrust housing 29 is located inside the back cover and a bolt 31 passes through openings in the adjustment plate and the housing and also through the slot 23. A nut 33 is threaded on the bolt 31 and, bytightening a knurled head 35 of the bolt, the back cover is clamped between the adjustment plate and the housing. On slacking the knurled nut, the adjustment plate and the housing can be slid along the slot 23 thereby repositioning the housing relative to the back cover.The slot 23 is directed towards the pivot 9 so that, by adjusting the position of the housing relative to the back cover, the distance between the pin 9 and the housing is adjustable.
Operating means comprises a tube 37 having plugs 39,41 fixed into its opposite ends. Plug 39 is pivotally mounted on a pivot spindle 43 extending between the side portions 3 of the member 1. A shaped memory effect element 45, which in its dis torted shape is in the form of a coil spring, is fitted around the tube 37 and one end abuts against an annular flange 47 on the plug 39 and the other end of the spring abuts against an annular flange on a spring seat 49 which is slidably mounted on a rod 51.
The rod extends into the tube 37 through openings in the plug 41 and spring seat 49 and the end in the tube carries a piston 53. The other end of the rod is threaded into a thrust pivot 55 carried by the thrust housing 29. The piston has one or more small diameter openings therethrough and the tube is filled with a liquid. The liquid is introduced into the tube through an opening in plug 39 and a screw 57 serves to close off the opening.
In use, the control device is fitted between a movable ventilator in a greenhouse and a fixed part of the greenhouse structure. For example, the support means 17 may be connected to the ventilator and the attachment means 7 connected to a fixed part of the frame of the greenhouse. The weight of the ventilator is such as to try to pivot the member 11 in an anti-clockwise direction about the pin 9. The position of the control device, when the ventilator is shut, is shown in full lines in Figure 1. When the temperature rises through the transition range of the SME material, the element 45 starts to revert to its initial shape and moves the spring seat into direct abutting relation with the pivot 55.Thereafter the element applies a considerable force to the spring seat 49 and this force is transmitted to the thrust pivot 55 and, when the force of the element overcomes the load applied to it, it causes the member 11 to rotate in a clockwise direction about the pin 9. The moment applied to the member 11, when the temperature rises into the transition temperature range of the SME element, is equal to the force generated in the element times the distance between the line of action of the force and the pivot 9. As can be seen from Figure 1, when the housing 29 is at the upper end of the slot 23, the distance between the line of action of the force and the pivot 9 is considerably greater than when the housing is at the lower end of the slot.By adjusting the position of the housing 29, relative to the back cover 19, the mechanical advantage of the member 11 about the pin 9 can be adjusted. As an alternative to, or in addition to, the adjustment provided by the back cover, the position on the arm 11 of the applied load could also be adjusted thereby altering the distance from the point of application of the load with respect to the pivot 9 and again this will adjust the mechanical advantage of the member 11.
Eventually the member 11 is rotated about the pivot 9 into the position shown in broken lines in
Figure 1, where the edge 21 of the back cover abuts against the base 5 of the member 3, thus providing a
positive stop.
The provision of the piston 53 in the tube 37 serves to damp the movement of the member 11 since the
piston can only move relatively slowly through the
liquid in the tube in this means that the window
opens and closes smoothly and with a positive
action.
In an alternative embodiment of the invention,
which is not illustrated, the thrust pivot 55 may be
supported at its ends in a pair of arcuate slots formed in the side members 3 of member 11 and, by adjusting the position of the thrust pivot in the slots, the distance between the thrust member and the pivot 9 is adjusted.
The damper constituted by the piston 53 in the tube 37 need not be provided or alternatively the damping action could be provided by passing the rod 51 through the bore of a tube of Ao polyurethane, the rod carrying an enlarged head portion which is of greater diameter than the bore of the tube. As the member 11 pivots about the pivot pin 9, the rod is moved along the bore of the polyurethane tube and the enlarged head portion engaging against the wall of the tube provides resistance to movement of the rod.
Claims (7)
1. Atemperature responsive control device comprising
a first member,
a second member pivotally secured to the first member and pivotable between first and second operating positions, said second member providing a support for a load,
operating means including an SME element, as hereinbefore defined, said element having an initial shape at temperatures above a transition temperature range and a distorted shape at temperatures below the transition temperature range, said operating means being connected to the second member at a position away from the pivot and to the first member,
the operating means being such that at temperatures below the transition range the second member is in its first operating position and attemperatures within the transition range the element tries to revert to its initial shape and pivots the second member to its second operating position, and
means for adjusting the position on the second member, relative to the pivot of the position of the application of the load and/or the position of the connection of the operating means.
2. Atemperature responsive control device as claimed in claim 1, in which in its distorted shape the element is in the form of a coil spring, connected indirectly at its opposite ends to the first and second members respectively.
3. Atemperature responsive control device as claimed in claim 2, in which the spring is located around a tube with one end abutting a plug located in one end of the tube and secured to the first member and the other end abutting a spring seat engageable with the second member.
4. Atemperature responsive control device as claimed in claim 3, in which the tube forms part of a damping mechanism for damping the movement of the second member relative to the first member.
5. Atemperature responsive control device as claimed in claim 4, in which the tube contains a liquid and a piston displaceable in the tube in response to movement of the second member.
6. Atemperature responsive control device as claimed in any preceding claim, in which the operating means includes a housing releasably secured to the second member, at positions spaced at different
distances from the pivot between the first and sec ond members.
7. Atemperature responsive control device substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8003023A GB2043764B (en) | 1979-01-29 | 1980-01-29 | Temperature responsive control device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7903032 | 1979-01-29 | ||
| GB8003023A GB2043764B (en) | 1979-01-29 | 1980-01-29 | Temperature responsive control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2043764A true GB2043764A (en) | 1980-10-08 |
| GB2043764B GB2043764B (en) | 1982-12-22 |
Family
ID=26270373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8003023A Expired GB2043764B (en) | 1979-01-29 | 1980-01-29 | Temperature responsive control device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2043764B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2129486A (en) * | 1982-09-23 | 1984-05-16 | Thermoforce Ltd | Window control mechanism |
| US4706330A (en) * | 1985-02-20 | 1987-11-17 | Ronald Sampson | Automatic closing activator |
| US10041685B2 (en) * | 2015-03-16 | 2018-08-07 | Lg Electronics Inc. | Hinge apparatus and oven with the same |
-
1980
- 1980-01-29 GB GB8003023A patent/GB2043764B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2129486A (en) * | 1982-09-23 | 1984-05-16 | Thermoforce Ltd | Window control mechanism |
| US4706330A (en) * | 1985-02-20 | 1987-11-17 | Ronald Sampson | Automatic closing activator |
| US10041685B2 (en) * | 2015-03-16 | 2018-08-07 | Lg Electronics Inc. | Hinge apparatus and oven with the same |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2043764B (en) | 1982-12-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |