US1768446A - Float switch - Google Patents
Float switch Download PDFInfo
- Publication number
- US1768446A US1768446A US1768446DA US1768446A US 1768446 A US1768446 A US 1768446A US 1768446D A US1768446D A US 1768446DA US 1768446 A US1768446 A US 1768446A
- Authority
- US
- United States
- Prior art keywords
- receptacle
- switch
- float
- contacts
- oil
- 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
- 210000003284 Horns Anatomy 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000004020 conductor Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 210000003414 Extremities Anatomy 0.000 description 4
- 101700078037 BIND Proteins 0.000 description 2
- 241000282326 Felis catus Species 0.000 description 2
- 239000007799 cork Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 230000000630 rising Effects 0.000 description 2
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/18—Switches operated by change of liquid level or of liquid density, e.g. float switch
Definitions
- My invention relates to indicating apparatus and particularly to apparatus for indicating liquid levels in receptacles.
- the invention has among its other ob'ects the production of apparatus of the ind described, which is compact, durable, convenient, efficient and satisfactory for use wherever found applicable.
- a particular object of the invention is to 1o provlde improved apparatus for indicating the level o oil in the drain pan or crank case of an internal combustion engine.
- One form of the invention is embodied in apparatus com rising a receptacle adapted to be connecte by a pipe to the drain pan or crank case of an internal combustion engine.
- a float mounted in the receptacle carries a pair of metallic plates, one of which is adapted to close a circuit including an electro-magnetically operated horn when the oil in the drain pan or crank case falls below a predetermined level.
- the other plate is adapted to close a circuit including a lamp when the crank case is filled with oil to or above a predetermined level.
- FIG. 36 The figure in the drawing is a longitudinal section taken through apparatus embodying the invention, a circuit forming part of the apparatus being shown diagrammatically.
- the reference character 10 designates a tank or receptacle which is formed of any suitable material.
- the receptacle 10 is formed with an annular flange 11 to which a plate 12 is secured by bolts or screws 13, the plate 12 being preferabl formed from suitable insulating materia such as fibre-board, or the equivalent.
- a rod 17 which guides 60 a float 18 disposed within the receptacle 10.
- the float 18 is preferably formed from cork. Mounted upon the upper and lower ends of the float 18 are metallic discs 20 and 21, respectively. The disc 21 may be brought into contact with two contacting members 23 and 24 which are suspended from the plate 12, the contacting members 23 and 24 being secured to the plate by binding posts 25 and 26, respectively. The disc 20 is adapted to be brought ⁇ into contact with the oo lower ends of relatively long screws 27 and 28 which project through the plate 12. The screws 27 and 28 are adjustably carried by the plate 12, a plurality of nuts 30 being provided for this purpose. Mounted in the 05 plate 12 is a tube or pipe-section 32 whereby the interior of the receptacle 10 communi- Cates with the atmosphere.
- the binding post 25 is connected to one terminal of a switch 34, the remaining ter- 7 minal of the switch being connected to one terminal of a storage battery 35 or the equivalent.
- the other terminal of the storage battery is grounded.
- the binding post 26 is connected to one terminal of an electromagnetically operated horn 37, which has its other terminal grounded.
- the screw 27 is connected to one terminal of a lamp 40 through a switch 41, the other terminal of the lamp 40 being connected to one terminal of the battery 35.
- the other terminal of the battery 35 is connected to the screw 28.
- the receptacle 10 is connected by a pipe 43' with a drain pan or crank case 44 of an internal combustion engine.
- the arrangement is such that the level of the oil in the receptacle 10 will coincide with the level of the oil in the drain pan or crank case 44.
- the float 18 will fall and rise with the changing oil levels in the crank case.
- the receptacle 10 is preferably mounted in such manner that when the oil in the crank case falls below a predetermined level, the float 18 will fall into av position wherein the disc 21 will contact with the contacting members E23 and 24.
- the horn 37 will then sound and notify the operator that the engine requires oil.
- the switch 34 may be opened as soon as the signal has been given.
- the screws 2T and 28 may be adjusted to occupy positions wherein they will be engaged by the disc 20 when the oil in the crank case is at or above a predetermined level.
- the switch 41 is preferably closed so that the lamp 40 will indicate when a sufficient quantity of oil has been poured into the crank case. After a signal has been given by the lamp 40 the switch may be opened. The operator may close the switch 41 at. any time he wishes to ascertain whether or not there is sufiicient oil in the crank case to hold the disc 20 in contact with the screws 27 and Q8.
- the receptacle 10 is preferably provided with a drain cock 45 so that sediment may be removed from the receptacle.
- An indicating apparatus including a receptacle, a cover demountably carried by said receptacle, a pair of electric contacts adjustably mounted on said cover and depending within said receptacle, a second pair of contacts mounted on said cover and depending within said receptacle below the extremities of said first mentioned contacts, a spindle mounted on said cover and also depending into said receptacle, a float slidably mounted on said spindle intermediate the extremities of said two pairs of contacts, said fioat having a conductor on its upper and lower faces, and means for connecting each pair of contacts with an electric circuit.
- An indicatingr apparatus including a receptacle, a closure detachably secured thereto, a set of electrical contacts adjustably mounted on said closure, a second set of electrical contacts connected to the underside of said closure and arranged with their points spaced in relation to said first mentioned contacts, a guide secured to said closure, a float slidably engageable therewith, said float provided with conductors adapted to cooperate with said electrical contacts, and means for connecting said electrical contacts with an electric circuit.
- An indicating apparatus including a receptacle, a closure detachably secured thereto, a set of electrical contacts adjustably mounted on said closure and depending within said receptacle, a second set of electrical contacts detachably connected to the underside of said closure apart from first set of contacts and formed with portions depending to a point lower than the points on first said contacts and further formed with portions extending inwardly and upwardly whereby the points of the same lie substantially opposite the points on first said contacts, a guide detachably secured to said closure, a float slidably engageable therewith, said float provided with conductors on its upper and lower faces adapted to cooperate with said electrical contacts, and means for connecting said electrical contacts with an electric circuit.
Description
.lune 24, 1930. N. GRON 1,768,446
FLOAT SWITCH Filed Aug. 7, 1925 Patented June 24, 1930 PATENT OFFICE NICHOLAS GRON, OF CHICAGO, ILLINOIS FLOAT SWITCH Application med August 7, 1925.
My invention relates to indicating apparatus and particularly to apparatus for indicating liquid levels in receptacles. The invention has among its other ob'ects the production of apparatus of the ind described, which is compact, durable, convenient, efficient and satisfactory for use wherever found applicable.
A particular object of the invention is to 1o provlde improved apparatus for indicating the level o oil in the drain pan or crank case of an internal combustion engine.
One form of the invention is embodied in apparatus com rising a receptacle adapted to be connecte by a pipe to the drain pan or crank case of an internal combustion engine. A float mounted in the receptacle carries a pair of metallic plates, one of which is adapted to close a circuit including an electro-magnetically operated horn when the oil in the drain pan or crank case falls below a predetermined level. The other plate is adapted to close a circuit including a lamp when the crank case is filled with oil to or above a predetermined level.
Many other objects and advantages of the construction hereln shown and described will be obvious to those skilled in the art from the disclosure herein given.
To this end my invention consists in the novel construction, arrangement and combination of parts herein shown and described, and more particularly pointed out in t-he claims.
36 The figure in the drawing is a longitudinal section taken through apparatus embodying the invention, a circuit forming part of the apparatus being shown diagrammatically.
Referring to the drawing, the reference character 10 designates a tank or receptacle which is formed of any suitable material. The receptacle 10 is formed with an annular flange 11 to which a plate 12 is secured by bolts or screws 13, the plate 12 being preferabl formed from suitable insulating materia such as fibre-board, or the equivalent. Depending from the plate 12 and secured thereto by nuts 14 is a rod 17 which guides 60 a float 18 disposed within the receptacle 10.
Serial No. 48,774.
The float 18 is preferably formed from cork. Mounted upon the upper and lower ends of the float 18 are metallic discs 20 and 21, respectively. The disc 21 may be brought into contact with two contacting members 23 and 24 which are suspended from the plate 12, the contacting members 23 and 24 being secured to the plate by binding posts 25 and 26, respectively. The disc 20 is adapted to be brought`into contact with the oo lower ends of relatively long screws 27 and 28 which project through the plate 12. The screws 27 and 28 are adjustably carried by the plate 12, a plurality of nuts 30 being provided for this purpose. Mounted in the 05 plate 12 is a tube or pipe-section 32 whereby the interior of the receptacle 10 communi- Cates with the atmosphere.
The binding post 25 is connected to one terminal of a switch 34, the remaining ter- 7 minal of the switch being connected to one terminal of a storage battery 35 or the equivalent. The other terminal of the storage battery is grounded. The binding post 26 is connected to one terminal of an electromagnetically operated horn 37, which has its other terminal grounded. Obviously, when the contacting members 23 and 24 are engaged by the metallic disc 21 and the switch 34 is in its closed osition, an electrical cur- 80 rent will flow as ollows: From the battery 35 through the switch 34, the binding post 25, the contact member 23, the disc 21, the contact member 24, the bindin post 26, the operating mechanism of the orn 37 and B5 through ground to the battery. The horn 37 will then sounduntil the switch 34 is opened or until the plate 21 is disengaged from the contacting members 23 and 24.
The screw 27 is connected to one terminal of a lamp 40 through a switch 41, the other terminal of the lamp 40 being connected to one terminal of the battery 35. The other terminal of the battery 35 is connected to the screw 28. When the switch 41 is in its 95 closed position and the screws 27 and 28 are engaged by the disc 20, an elect'rical current will flow as follows: From the battery 35 through the lamp 40, the switch 41, the screw 27, the disc 20 and through the screw .28 to the battery 35. The lamp will remain lighted until the switch 41 is opened or the disc 2O is withdrawn from contact with the screws 2T and QS.
In the illustrated embodiment of the invention, the receptacle 10 is connected by a pipe 43' with a drain pan or crank case 44 of an internal combustion engine. The arrangement is such that the level of the oil in the receptacle 10 will coincide with the level of the oil in the drain pan or crank case 44. Obviously, the float 18 will fall and rise with the changing oil levels in the crank case. The receptacle 10 is preferably mounted in such manner that when the oil in the crank case falls below a predetermined level, the float 18 will fall into av position wherein the disc 21 will contact with the contacting members E23 and 24. The horn 37 will then sound and notify the operator that the engine requires oil. The switch 34 may be opened as soon as the signal has been given. The screws 2T and 28 may be adjusted to occupy positions wherein they will be engaged by the disc 20 when the oil in the crank case is at or above a predetermined level. During the filling operation the switch 41 is preferably closed so that the lamp 40 will indicate when a sufficient quantity of oil has been poured into the crank case. After a signal has been given by the lamp 40 the switch may be opened. The operator may close the switch 41 at. any time he wishes to ascertain whether or not there is sufiicient oil in the crank case to hold the disc 20 in contact with the screws 27 and Q8.
The receptacle 10 is preferably provided with a drain cock 45 so that sediment may be removed from the receptacle.
Having thus described my invention, it is obvious that various immaterial modifications may be made in the same without departing from the spirit of my invention; hence I do not wish to be understood as limiting myself to the exact form, construction, arrangement and combination of parts herein shown and described or uses mentioned.
That I claim as new and desire to secure by Letters Patent is:
1, An indicating apparatus including a receptacle, a cover demountably carried by said receptacle, a pair of electric contacts adjustably mounted on said cover and depending within said receptacle, a second pair of contacts mounted on said cover and depending within said receptacle below the extremities of said first mentioned contacts, a spindle mounted on said cover and also depending into said receptacle, a float slidably mounted on said spindle intermediate the extremities of said two pairs of contacts, said fioat having a conductor on its upper and lower faces, and means for connecting each pair of contacts with an electric circuit.
Q. An indicatingr apparatus including a receptacle, a closure detachably secured thereto, a set of electrical contacts adjustably mounted on said closure, a second set of electrical contacts connected to the underside of said closure and arranged with their points spaced in relation to said first mentioned contacts, a guide secured to said closure, a float slidably engageable therewith, said float provided with conductors adapted to cooperate with said electrical contacts, and means for connecting said electrical contacts with an electric circuit.
3. An indicating apparatus including a receptacle, a closure detachably secured thereto, a set of electrical contacts adjustably mounted on said closure and depending within said receptacle, a second set of electrical contacts detachably connected to the underside of said closure apart from first set of contacts and formed with portions depending to a point lower than the points on first said contacts and further formed with portions extending inwardly and upwardly whereby the points of the same lie substantially opposite the points on first said contacts, a guide detachably secured to said closure, a float slidably engageable therewith, said float provided with conductors on its upper and lower faces adapted to cooperate with said electrical contacts, and means for connecting said electrical contacts with an electric circuit.
In testimony whereof, I have hereunto signed my name.
NICHOLAS GRON.
Publications (1)
Publication Number | Publication Date |
---|---|
US1768446A true US1768446A (en) | 1930-06-24 |
Family
ID=3420189
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US1768446D Expired - Lifetime US1768446A (en) | Float switch |
Country Status (1)
Country | Link |
---|---|
US (1) | US1768446A (en) |
Cited By (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2497029A (en) * | 1946-12-30 | 1950-02-07 | Carter Carburetor Corp | Oil pressure control and warning device |
US2524274A (en) * | 1946-03-28 | 1950-10-03 | Samuels Harry | Exhaustion indicator |
US2623143A (en) * | 1950-03-21 | 1952-12-23 | Laury Herve | Arrangement for indicating the level of oil in the crankcases of motor cars and the like vehicle engines |
US2661411A (en) * | 1952-11-13 | 1953-12-01 | Berger Harold | Automatic fluid level signal for automobiles |
US2707395A (en) * | 1952-04-22 | 1955-05-03 | Liquidvision Gauge And Control | Electric remote reading tank gauge |
US2775126A (en) * | 1952-10-15 | 1956-12-25 | Simmonds Aerocessories Ltd | Densitometers for measuring the specific gravity of liquids |
US2811600A (en) * | 1955-10-10 | 1957-10-29 | Alexander D Storck | Brake fluid-level warning device for a master cylinder |
US2819363A (en) * | 1953-05-08 | 1958-01-07 | Samuel M Narzisi | Brake fluid level indicator |
US2826629A (en) * | 1951-12-21 | 1958-03-11 | Felten & Guilleaume Carlswerk | High pressure tanks for oil cable installations |
US3042772A (en) * | 1961-02-01 | 1962-07-03 | Rudolph R Steinberger | Safety device for washing machines |
US3239829A (en) * | 1962-08-21 | 1966-03-08 | Cline Wilfred | Irrigation signal lamp |
US3471664A (en) * | 1967-02-23 | 1969-10-07 | Lee S L L G Inc | Float-switch mechanism to monitor liquid level |
US3703716A (en) * | 1971-07-19 | 1972-11-21 | Thomas Moore | Automatic transmission fluid replenishment means and level indicator |
US3832982A (en) * | 1973-09-10 | 1974-09-03 | H Guehr | Coolant loss or coolant pump malfunction detection system for internal combustion engines |
US4398186A (en) * | 1981-05-27 | 1983-08-09 | Statz Ralph M | Sewer back up warning system |
US4467156A (en) * | 1983-01-10 | 1984-08-21 | Ford Motor Company | Liquid level sensor switch |
US4473730A (en) * | 1982-01-20 | 1984-09-25 | Alps Electric Co., Ltd. | Liquid-level detection switch |
US4539547A (en) * | 1983-04-25 | 1985-09-03 | Ford Motor Company | Low liquid level sensing and warning circuit |
US4591837A (en) * | 1982-09-20 | 1986-05-27 | Martinez Donald G | Hydraulic fluid leak warning apparatus |
US4694128A (en) * | 1986-07-07 | 1987-09-15 | Casco Products Corporation | Float switch construction for monitoring liquid levels |
US4758700A (en) * | 1986-07-07 | 1988-07-19 | Casco Products Corporation | Switch construction employing contact having spaced-apart contact points |
FR2629955A1 (en) * | 1988-04-07 | 1989-10-13 | Transfix Soc Nouv | Device for protection of a submerged electrical apparatus by detecting leakages of dielectric liquid |
US4910495A (en) * | 1988-11-07 | 1990-03-20 | Sullivan James M | Dipstick with automatic warning device |
US5301628A (en) * | 1993-02-08 | 1994-04-12 | Daskalides Georges B | Boat docking post |
US5388179A (en) * | 1991-10-03 | 1995-02-07 | Boyd, Jr.; Richard | Float switch for preventing damage to the electric water heater element |
US5744701A (en) * | 1995-01-20 | 1998-04-28 | The Toro Company | Electronic liquid leak detector |
US6230089B1 (en) | 1992-01-03 | 2001-05-08 | The Toro Company | Turf maintenance vehicle multiple controller method and apparatus |
US20030140964A1 (en) * | 2002-01-29 | 2003-07-31 | O'donnell Thomas M. | Air escape valve |
US6696960B1 (en) | 2003-04-01 | 2004-02-24 | Donald G. Martinez | Hydraulic system with fluid leak warning apparatus |
US20070227244A1 (en) * | 2006-03-28 | 2007-10-04 | Dykstra Richard A | Fluid level switch |
US20090294269A1 (en) * | 2008-06-03 | 2009-12-03 | Honda Motor Co., Ltd. | Oil level detecting switch |
US20140013616A1 (en) * | 2012-07-13 | 2014-01-16 | Samsung Electronics Co., Ltd. | Water level sensing device and clothing dryer including the same |
US20140041449A1 (en) * | 2012-08-08 | 2014-02-13 | Kia Motors Corporation | Battery pack assembly including apparatus for detecting water accumulation and method for detecting water accumulation |
-
0
- US US1768446D patent/US1768446A/en not_active Expired - Lifetime
Cited By (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2524274A (en) * | 1946-03-28 | 1950-10-03 | Samuels Harry | Exhaustion indicator |
US2497029A (en) * | 1946-12-30 | 1950-02-07 | Carter Carburetor Corp | Oil pressure control and warning device |
US2623143A (en) * | 1950-03-21 | 1952-12-23 | Laury Herve | Arrangement for indicating the level of oil in the crankcases of motor cars and the like vehicle engines |
US2826629A (en) * | 1951-12-21 | 1958-03-11 | Felten & Guilleaume Carlswerk | High pressure tanks for oil cable installations |
US2707395A (en) * | 1952-04-22 | 1955-05-03 | Liquidvision Gauge And Control | Electric remote reading tank gauge |
US2775126A (en) * | 1952-10-15 | 1956-12-25 | Simmonds Aerocessories Ltd | Densitometers for measuring the specific gravity of liquids |
US2661411A (en) * | 1952-11-13 | 1953-12-01 | Berger Harold | Automatic fluid level signal for automobiles |
US2819363A (en) * | 1953-05-08 | 1958-01-07 | Samuel M Narzisi | Brake fluid level indicator |
US2811600A (en) * | 1955-10-10 | 1957-10-29 | Alexander D Storck | Brake fluid-level warning device for a master cylinder |
US3042772A (en) * | 1961-02-01 | 1962-07-03 | Rudolph R Steinberger | Safety device for washing machines |
US3239829A (en) * | 1962-08-21 | 1966-03-08 | Cline Wilfred | Irrigation signal lamp |
US3471664A (en) * | 1967-02-23 | 1969-10-07 | Lee S L L G Inc | Float-switch mechanism to monitor liquid level |
US3703716A (en) * | 1971-07-19 | 1972-11-21 | Thomas Moore | Automatic transmission fluid replenishment means and level indicator |
US3832982A (en) * | 1973-09-10 | 1974-09-03 | H Guehr | Coolant loss or coolant pump malfunction detection system for internal combustion engines |
US4398186A (en) * | 1981-05-27 | 1983-08-09 | Statz Ralph M | Sewer back up warning system |
US4473730A (en) * | 1982-01-20 | 1984-09-25 | Alps Electric Co., Ltd. | Liquid-level detection switch |
US4591837A (en) * | 1982-09-20 | 1986-05-27 | Martinez Donald G | Hydraulic fluid leak warning apparatus |
US4467156A (en) * | 1983-01-10 | 1984-08-21 | Ford Motor Company | Liquid level sensor switch |
US4539547A (en) * | 1983-04-25 | 1985-09-03 | Ford Motor Company | Low liquid level sensing and warning circuit |
US4694128A (en) * | 1986-07-07 | 1987-09-15 | Casco Products Corporation | Float switch construction for monitoring liquid levels |
US4758700A (en) * | 1986-07-07 | 1988-07-19 | Casco Products Corporation | Switch construction employing contact having spaced-apart contact points |
FR2629955A1 (en) * | 1988-04-07 | 1989-10-13 | Transfix Soc Nouv | Device for protection of a submerged electrical apparatus by detecting leakages of dielectric liquid |
US4910495A (en) * | 1988-11-07 | 1990-03-20 | Sullivan James M | Dipstick with automatic warning device |
US5388179A (en) * | 1991-10-03 | 1995-02-07 | Boyd, Jr.; Richard | Float switch for preventing damage to the electric water heater element |
US6230089B1 (en) | 1992-01-03 | 2001-05-08 | The Toro Company | Turf maintenance vehicle multiple controller method and apparatus |
US5301628A (en) * | 1993-02-08 | 1994-04-12 | Daskalides Georges B | Boat docking post |
US5744701A (en) * | 1995-01-20 | 1998-04-28 | The Toro Company | Electronic liquid leak detector |
US20030140964A1 (en) * | 2002-01-29 | 2003-07-31 | O'donnell Thomas M. | Air escape valve |
US6696960B1 (en) | 2003-04-01 | 2004-02-24 | Donald G. Martinez | Hydraulic system with fluid leak warning apparatus |
US20070227244A1 (en) * | 2006-03-28 | 2007-10-04 | Dykstra Richard A | Fluid level switch |
US7484409B2 (en) | 2006-03-28 | 2009-02-03 | Briggs & Stratton Corporation | Fluid level switch |
US20090294269A1 (en) * | 2008-06-03 | 2009-12-03 | Honda Motor Co., Ltd. | Oil level detecting switch |
US7696445B2 (en) * | 2008-06-03 | 2010-04-13 | Honda Motor Co., Ltd. | Oil level detecting switch |
US20140013616A1 (en) * | 2012-07-13 | 2014-01-16 | Samsung Electronics Co., Ltd. | Water level sensing device and clothing dryer including the same |
US20140041449A1 (en) * | 2012-08-08 | 2014-02-13 | Kia Motors Corporation | Battery pack assembly including apparatus for detecting water accumulation and method for detecting water accumulation |
US9099760B2 (en) * | 2012-08-08 | 2015-08-04 | Hyundai Motor Company | Battery pack assembly including apparatus for detecting water accumulation and method for detecting water accumulation |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US1768446A (en) | Float switch | |
US1634165A (en) | Electric gasoline gauge | |
US2661411A (en) | Automatic fluid level signal for automobiles | |
US1978392A (en) | Liquid level indicating means | |
US2325925A (en) | Delayed closing automatic water discharge valve | |
US669922A (en) | Means for the prevention of incrustation in boilers. | |
US1996729A (en) | Induction coil | |
US1305963A (en) | Oil-gage signal and circuit-breaker | |
US1552373A (en) | Electric gauge for gasoline tanks | |
US1616529A (en) | Electric liquid-quantity indicator | |
US1963123A (en) | Low level indicator for electrolyte of storage batteries | |
GB315867A (en) | Improvements in transformer tap changing systems | |
US1305998A (en) | fromager and j | |
US1335295A (en) | Bell-rheostat | |
SU24735A1 (en) | Device for signaling the limits of the water level in the tank | |
US1834833A (en) | Circuit breaker | |
US2005413A (en) | Switch structure | |
US1669684A (en) | Oil-level indicator for automobiles | |
US1761535A (en) | Condenser and transformer unit | |
US1659596A (en) | Ignition coil for combustion motors | |
DE926814C (en) | Electric fuel level indicator for vehicles | |
US1458338A (en) | Height indicator for liquids | |
US1801303A (en) | Switch | |
US1724263A (en) | Electrical dehydrator | |
US1877041A (en) | Method and means for testing storage batteries |