US1773234A - Electrical control apparatus - Google Patents
Electrical control apparatus Download PDFInfo
- Publication number
- US1773234A US1773234A US153712A US15371226A US1773234A US 1773234 A US1773234 A US 1773234A US 153712 A US153712 A US 153712A US 15371226 A US15371226 A US 15371226A US 1773234 A US1773234 A US 1773234A
- Authority
- US
- United States
- Prior art keywords
- piston
- control apparatus
- electrical control
- point
- silver
- 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
Links
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 9
- 229910052709 silver Inorganic materials 0.000 description 9
- 239000004332 silver Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 101100024000 Caenorhabditis elegans mom-5 gene Proteins 0.000 description 1
- 210000002837 heart atrium Anatomy 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/36—Thermally-sensitive members actuated due to expansion or contraction of a fluid with or without vaporisation
Definitions
- My invention relates to improvements in and connected with electrical control apparatus, and has for its object the automatic cutting off and on of the electrical supply in furnaces, ovens and the like.
- I provide an expansion bulb filled with a medium which operates a parabolic shaped steel diaphragm carrying a fined silver point which under heat comes in contact with an adjustable silver pointmounted on a secondary piston, the se i: in turn being mounted on a primary on.
- the primary piston is moved out and in by mom 5 oil: a thumb-screw having a pointer over a graduated dial. This, it will be observed, alters the position, of one silver point relatively to the other silver point and so raises the temperature control point.
- the control is so arranged that, when the medium expands under heat, the circuit is closed, thus operating a relay and so the main circuit of an electric furnace or the like.
- a and B are the two silver points, A being suitably connected to th steel parabolic diaphragm C.
- a second diaphragm C is used to seal up the liquid expansion medium in the container E which suitably connected to the main body D.
- the container E is inserted into the apparatus the heat of which requires to be controlled.
- the silver poin A together with a plate mounting is suitably insulated from the steel diaphragm O with its plate by the insertion of a sheet F of mica or other suitable material.
- the other silver point B is mounted on a secondary piston G carried on a disc H and is free to slide through the center hole on the disc H, a small spring I being provided between the flange of the secondary piston G and the disc H to cause the silver point to return to its original position when the temperature falls
- the disc H is suitably connected at its upper end to the primary piston J, which is contained in an extension D 01": the main body D, the lower end oi? the primary piston J being contained in the cap-nut K which capnu't K is screwed on the extension D of the -main body I).
- a spring L is provided, one end bearing against the extension D, the other bearing against a flange J fixed to the lower end of the piston J
- the object of the spring L is to keep the primary piston in contact with the adj usting screw K of the cap-nut K.
- M is the handle of the cap-nut -for operating the primary piston J and in turn the silver point B.
- Electrical control apparatus compri ng a container for an expansive medium, a diapl'iragm arranged for movement by the expansion of the ex ansive medium, a contact pointcarried by said diaohragm, body having a bore opposite said contact point, a primary piston arranged for movement in said bore, a disc on the end of said piston op posed to said contact point, said having a bore, a secondary piston movable in the bore of said disc, a contact point on said ondary piston, opposed to the first named contact point, a spring a Live to move the secondary piston with contact point toward the first named contact point, a spring active to move the prime. ry piston in the reverse direction to that of the secondary piston, a cap-nutenclosing primary piston and the last named spring and means to adjustably move the primary piston and. hence also the secondary piston against the tension of: the second named spring.
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Thermally Actuated Switches (AREA)
- Electrolytic Production Of Metals (AREA)
Description
g- 19, 1930' R. MACLAREN 1,773,234
ELECTRICAL CONTROL APPARATUS Filed Dec. 1926 Patented Aug. 19, 1930 PATENT QFFECE ROBERT MACLAR-EN, OF CULROSS, SCOTLAND ELECTRICAL GUHTRGL APLPAB-ATUS Application filed December 9, 1926, Serial No. 153,?12, and in Great Britain December 31, 1925.
My invention relates to improvements in and connected with electrical control apparatus, and has for its object the automatic cutting off and on of the electrical supply in furnaces, ovens and the like.
In carr ing out this invention, I provide an expansion bulb filled with a medium which operates a parabolic shaped steel diaphragm carrying a fined silver point which under heat comes in contact with an adjustable silver pointmounted on a secondary piston, the se i: in turn being mounted on a primary on. The primary piston is moved out and in by mom 5 oil: a thumb-screw having a pointer over a graduated dial. This, it will be observed, alters the position, of one silver point relatively to the other silver point and so raises the temperature control point. The control is so arranged that, when the medium expands under heat, the circuit is closed, thus operating a relay and so the main circuit of an electric furnace or the like.
In order that my invention may be properlv understood and readily carried into e1?- i'bct, I have hereunto appended one sheet of drawing, which is a sectional elevation illustratii a my invention.
' rring to the drawing, A and B are the two silver points, A being suitably connected to th steel parabolic diaphragm C. A second diaphragm C is used to seal up the liquid expansion medium in the container E which suitably connected to the main body D. The container E is inserted into the apparatus the heat of which requires to be controlled. The silver poin A together with a plate mounting is suitably insulated from the steel diaphragm O with its plate by the insertion of a sheet F of mica or other suitable material. The other silver point B is mounted on a secondary piston G carried on a disc H and is free to slide through the center hole on the disc H, a small spring I being provided between the flange of the secondary piston G and the disc H to cause the silver point to return to its original position when the temperature falls The disc H is suitably connected at its upper end to the primary piston J, which is contained in an extension D 01": the main body D, the lower end oi? the primary piston J being contained in the cap-nut K which capnu't K is screwed on the extension D of the -main body I). A spring L, is provided, one end bearing against the extension D, the other bearing against a flange J fixed to the lower end of the piston J The object of the spring L is to keep the primary piston in contact with the adj usting screw K of the cap-nut K. M is the handle of the cap-nut -for operating the primary piston J and in turn the silver point B.
Under heat the contents of the container E expand, this causes the parabolic diaphragms C and to move forward, conse quently carrying the point A up to the point- B, thus forming an electrical connection, and used to operate a suitable switch.
Claim:
Electrical control apparatus compri ng a container for an expansive medium, a diapl'iragm arranged for movement by the expansion of the ex ansive medium, a contact pointcarried by said diaohragm, body having a bore opposite said contact point, a primary piston arranged for movement in said bore, a disc on the end of said piston op posed to said contact point, said having a bore, a secondary piston movable in the bore of said disc, a contact point on said ondary piston, opposed to the first named contact point, a spring a Live to move the secondary piston with contact point toward the first named contact point, a spring active to move the prime. ry piston in the reverse direction to that of the secondary piston, a cap-nutenclosing primary piston and the last named spring and means to adjustably move the primary piston and. hence also the secondary piston against the tension of: the second named spring.
In witness whereof? I atria my signature.
ROBERT rnrcLAi-nas.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB12393/26A GB256546A (en) | 1925-12-31 | 1925-12-31 | Improvements in and connected with electrical control apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1773234A true US1773234A (en) | 1930-08-19 |
Family
ID=10003741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US153712A Expired - Lifetime US1773234A (en) | 1925-12-31 | 1926-12-09 | Electrical control apparatus |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US1773234A (en) |
| GB (1) | GB256546A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2761037A (en) * | 1952-05-27 | 1956-08-28 | Kenneth H Thomas | Electric cleanout plug warning device |
-
1925
- 1925-12-31 GB GB12393/26A patent/GB256546A/en not_active Expired
-
1926
- 1926-12-09 US US153712A patent/US1773234A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2761037A (en) * | 1952-05-27 | 1956-08-28 | Kenneth H Thomas | Electric cleanout plug warning device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB256546A (en) | 1926-08-12 |
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