US2426907A - Lamp - Google Patents

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US2426907A
US2426907A US644030A US64403046A US2426907A US 2426907 A US2426907 A US 2426907A US 644030 A US644030 A US 644030A US 64403046 A US64403046 A US 64403046A US 2426907 A US2426907 A US 2426907A
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liquid
lamp
receptacle
contact
bulbs
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US644030A
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Patrick J Walsh
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00Arrangement of electric circuit elements in or on lighting devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00Arrangement of electric circuit elements in or on lighting devices
    • F21V23/02Arrangement of electric circuit elements in or on lighting devices the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier

Definitions

  • This invention is a lamp wherein the intensity of the illumination therefrom may be varied at the will of-the operator.
  • the lamp of this invention preferably embodies a plurality ofrincandescent filament bulbs mounted on an appropriate standard or column, carried by a base which encloses a receptacle or vessel containing a liquid adapted to pass electrical-current, but with variablerresistance to such passage depending-upon the spacing-of the electrodes between which the current is fed through the liquid.
  • a switching device electrically connected to the several bulbs and thlOllgh the -manipulation of this current switching device :said lamps may be energized in succession, so that one -or more of them may be illuminated with normal maximum brilliancy.
  • a switching device Associated with said switching device is also amanually operablemember to which is connected a movable arm adapted to be shift- .edfrom a point above the surface of the liquid in the vessel to various depths within the liquid and into engagement with a .iixed contact .near the base of the vessel.
  • the movable arm and fixed contact are included in a circuit shunting the switching device .and including one of the bulbs so that, when the switching device is in position to extinguish all of the bulbs, the movable arm may be manipulated to illuminate one of them and control the intensity of light therefrom, according to the relative positions between the movable arm and the submerged fixed contact.
  • one or more of the bulbs may be lit when relatively bright illumination is desired or all of these bulbs may be extinguished and one of them energized with such degree of dimness as may be desired-by the operator.
  • FIG.1 is a vertical section through a lamp embodying the present invention, the same being shown as a table lamp.
  • Figure 2 is a section ,on the line 2-2 of Figure 1.
  • Figure 3 isa-fragmentalsection on the line 33 .of Figure 2.
  • a -tu 'bular column on the upper end of which is mounted a head 2 supporting a plurality of lamp sockets I3, lland 5. These sockets are adapted to receive incandescent bulbs l'3a, 4aand 5a, respectively. Three of .thesebulbs are shown but more or less may be used without departingfrom the invention.
  • the lower-end of the column is threaded to be screwed upon and supported by a threaded boss 6 on the cover 1- of a receptacle 8.
  • This receptacle is preferably made of plastic material or of some other-dielectric substance.
  • the cover is hinged at one side, as indicated at 9, andhas a catch at its opposite side so that it can be normally secured in closed position.
  • the bottom of the receptacle is extended as .shOWn at .H "toiorma base forthe lamp and to this base asuitable-s'hell L2 is attached by means of screws 1'3-
  • This shell may be of any appropriate shape and its function .is to enclose the receptacle, switching device, etc and form an outer housing-of pleasing and artistic appearance.
  • a conductive plate ll is positioned within the base of the receptacle '8 to provide a contact I positioned within the receptacle and having on the exteriorof the receptacle a binding post to which is affixed a terminal or terminal connection 16.
  • the receptacle 8 may be of anydesired shape, but for the purpose of illustration, I have shown itas provided near. its top with oppositely projecting lateral extensions I1.
  • One of these extensions serves as a support for a spindle is which passes through the opposite walls thereof (see Figure 2) with a, nut-l9 at one end and at its other end a slip 'connection 20 by means of which it may be sprung into engagement with a shank 21 of amanually operable knob '22 positioned exteriorly of the shell [2.
  • a gland 23 is associated with the spindle l8 so .as to preclude leakage of liquidIL adapted to be contained within the receptacle.
  • This current switching device embodies an insulating block 26, secured in fixed position and on the outer surface of which are mounted three fixed contacts 21, 28 and 29. With these contacts a movable contact or wiper 30 cooperates.
  • This wiper is mounted on an arm 3!, keyed to a sleeve 32, embracing the spindle [8 which has squared or dog connection with the shank 33 of a knob 34 positioned exteriorly of the shell, directly back of the knob 22.
  • a light spring 35 impels the wiper in the direction of the face of theblock of insulation 26 on which the contacts 21, 28 and 29 I are positioned. By rotating the knob 34 the wiper 30 may be caused to engage the contacts 21, 28
  • a wire 43 is connected to the wire 4
  • This wire 43 together with the arm 24, liquid L and contact l5, collectively from a shunt circuit shunting the current switching device for the several bulbs.
  • the arm 24 Under normal conditions the arm 24 is in the position shown in Figure 1 wherein it lies wholly above the surface of the liquid L. Likewise the movable contact 30 is .in the position shown in this figure so that all circuits to the'bulbs are dead.
  • the knob 34 When it is desired to turn on the bulbs without dimming, the knob 34 is rotated in a clockwise direction as viewed in Figures 1 and 3 to move the contact 30 into engagementwith'the contact 21. This completes the circuit through the bulb 5a and it will glow with maximum intensity. If the rotation of the knob is continued, the contact 30 will next engage with the contact 28 to turn on the bulb 4a and continued rotation of the knob will engage the contact 30 also with the contact 29, so that all three bulbs will glow brightly. Th'us either one, two or three lamps may be turned on at the will of the operator. r 3
  • the movable contact 30 may be returned to the position in Figure 1 to extinguish all of the bulbs and, while it remains in this position, theknob 22 may be rotated in a counterclockwise direction to correspondingly swing the arm 24 so that its end is caused to enter into the liquid L. As soon as this occurs, current will pass fromthe arm 24 through the liquid to the conducting plate l4, but with a resistance inversely to the distance between the end of the arm 24 and the plate [4.
  • This arrangement makes the lamp particularly useful either to give full illumination or as a night light where just enough light is required to permit one to see his way around.
  • any appropriate liquid L may be used in the receptacle 8 and for convenience in replenishing this liquid, the cover 1 is provided with an upstanding filling tube 44 which extends to and terminates in an aperture in the shell.
  • the open end of this filling tube is closed by a cap 45 having a. spring hinge 46 which normally holds it shut, but it may be manually opened when desired to permit liquid to be poured into the vessel.
  • This spring closure also serves as a safety valve in the event that evaporation of the liquid L occurs at such a rate as to build up pressure in the vessel. This will not of course ordinarily occur, but might conceivably happen if the owner of the lamp should remove one of the bulbs and improperly use that socket to connect other elec trical appliances or a plurality of other lamps, as persons sometimes do.
  • a lamp comprising a receptacle adapted to contain an electrical resistance liquid, 9. column supporting at least one incandescent lamp bulb, an electrical circuit including said lamp bulb and also including a manually operable switch through which current may be fed directly to the lamp bulb, a shunt circuit connected across said switch and including a fixed contact submerged in the liquid in the receptacle, and a movable contact adjustable through said liquid toward and away from said submerged fixed contact, and means for manually adjusting said movable contact to interpose in the shunt circuit the resistance of more or less of the liquid contained in the receptacle at the will of the operator to vary the intensity of the bulb thus energized.
  • a lamp comprising a base provided with a receptacle adapted to contain a resistance liquid, a column extending from the base and supporting at least one lamp bulb, an electric circuit extending into the base and upwardly through the column to the lamp bulb and including, within the base, a manually operable switch to directly control the feed of current to the lamp bulb, a shunt circuit connected across the switch with one terminal of the circuit submerged in the resistance liquid and the other terminal of the circuit connected to an arm pivotally supported above the surface of the resistance liquid, and manually operable means for causing said arm to dip into the resistance liquid for the purpose of completing the shunt circuit through said liquid to the bulb, the length of the path of current through the liquid determining the intensity of the bulb when thus illuminated.
  • a lamp comprising a base provided with a receptacle adapted to contain a resistance liquid, a column extending from the base and supporting a plurality of lamp bulbs, an electrical circuit leading into the base and having a common feed wire extending through the base and through the column to one terminal of each of the several lamp bulbs in succession, a switch within the base comprising fixed and movable contacts, the fixed contacts being individually connected to the several bulbs and the movable contact being con-.
  • a lamp comprisin a base provided with a receptacle adapted to contain a resistance liquid, a column extending from the base and supporting a plurality of lamp bulbs, an electrical circuit leading into the base and having a common feed wire extending through the base and through the column to one terminal of each of the several lamp bulbs in succession, a switch within the base comprising fixed and movable contacts, the fixed contacts being individually connected to the several bulbs and the movable contact being connected to the common return of such circuit, and
  • the movable contact being manually movable to engage said fixed contacts accumulatively and in succession, in combination with a shunt circuit around the switch and including one of the bulbs, said shunt circuit having normally spaced terminals, one of which comprises a conductive plate at the bottom of the receptacle and is submerged in the liquid in the receptacle and the other of which is in the form of an arm manually movable from a point above the surface of such liquid downwardly through the liquid and into contact with the other terminal at the will of the operator.
  • a lamp comprising a receptacle adapted to contain an electrical resistance liquid, a column supporting at least one incandescent lamp bulb, an electrical circuit including said lamp bulb and also including a manually operable switch through which current may be fed directly to the lamp bulb, a shunt circuit connected across said switch and including a fixed contact submerged in the liquid in the receptacle, and a movable contact adjustable through said liquid toward and away from said submerged fixed contact, and means for manually adjusting said movable contact to interpose in the shunt circuit the resistance of more or less of the liquid contained in the receptacle at the will of the operator to vary the intensity of the bulb thus energized, said receptacle having a filler tube provided with a spring pressed closure adapted to open and relieve gaseous pressure if such becomes present in the receptacle.
  • a lamp comprising a base provided with a receptacle adapted to contain a resistance liquid, a column extending from the base and supporting a plurality of lamp bulbs, an electrical circuit leading into the base and havin a common feed wire extending through the base and through the column to one terminal of each of the several lamp bulbs in succession, a switch Within the base comprising fixed and movable contacts, the fixed contacts being individually connected to the several bulbs and the movable contact being connected to the common return of such circuit and the movable contact being manually movable to engage said fixed contacts accumulatively and in succession, in combination with a shunt circuit around the switch and including one of the bulbs, said shunt circuit having normally spaced terminals, one of which is submerged in the liquid in the receptacle and the other of which is in the form of an arm manually movable from a point above the surface of such liquid downwardly through the liquid and into contact with the other terminal at the will of the operator, said receptacle having a filler tube provided with a spring

Description

' Sept. 2,1947. P. J, WALSH 2,426,907
LAMP
Filed Jan. 29, 194,6 2 Sheets-Shee t' 1 I v nvwwrok F i PATRICK J. WALSH TTORWE Y 2 Sheets-Sheet 2 'P. J. WALSH Sept. 2, 1947.
- LAMP INVENTDR PATRICK J. WALSH TTORNEY Patented Sept. 2, 1947 UNITED STATES PATENT OFFICE LAMP 7 Patrick 2!. Welsh, New York,'N. Y. Application January 29, 1946, :Serial No.-644,030
fi-(llaims. 1 This invention is a lamp wherein the intensity of the illumination therefrom may be varied at the will of-the operator.
The lamp of this invention preferably embodies a plurality ofrincandescent filament bulbs mounted on an appropriate standard or column, carried by a base which encloses a receptacle or vessel containing a liquid adapted to pass electrical-current, but with variablerresistance to such passage depending-upon the spacing-of the electrodes between which the current is fed through the liquid. Within the base of the lamp is a switching device electrically connected to the several bulbs and thlOllgh the -manipulation of this current switching device :said lamps may be energized in succession, so that one -or more of them may be illuminated with normal maximum brilliancy. Associated with said switching device is also amanually operablemember to which is connected a movable arm adapted to be shift- .edfrom a point above the surface of the liquid in the vessel to various depths within the liquid and into engagement with a .iixed contact .near the base of the vessel. The movable arm and fixed contact are included in a circuit shunting the switching device .and including one of the bulbs so that, when the switching device is in position to extinguish all of the bulbs, the movable arm may be manipulated to illuminate one of them and control the intensity of light therefrom, according to the relative positions between the movable arm and the submerged fixed contact. With this arrangement one or more of the bulbs may be lit when relatively bright illumination is desired or all of these bulbs may be extinguished and one of them energized with such degree of dimness as may be desired-by the operator.
Features of the invention, other than thoseiadverted to, will be apparent from the hereinafter detailed description and claims, when read in conjunction with the accompanyingdrawings.
The accompanying drawings illustrate one practical embodiment of the invention, but the construction therein shown is to be. understood .as illustrative, only, and not as definingthe embodiments of the invention. a
Figure .1 is a vertical section through a lamp embodying the present invention, the same being shown as a table lamp.
Figure 2 is a section ,on the line 2-2 of Figure 1.
Figure 3 isa-fragmentalsection on the line 33 .of Figure 2.
Referring to the drawings, indicates a -tu 'bular column on the upper end of which is mounteda head 2 supportinga plurality of lamp sockets I3, lland 5. These sockets are adapted to receive incandescent bulbs l'3a, 4aand 5a, respectively. Three of .thesebulbs are shown but more or less may be used without departingfrom the invention.
The lower-end of the column is threaded to be screwed upon and supported by a threaded boss 6 on the cover 1- of a receptacle 8. This receptacle is preferably made of plastic material or of some other-dielectric substance. The cover is hinged at one side, as indicated at 9, andhas a catch at its opposite side so that it can be normally secured in closed position.
The bottom of the receptacle is extended as .shOWn at .H "toiorma base forthe lamp and to this base asuitable-s'hell L2 is attached by means of screws 1'3- This shell may be of any appropriate shape and its function .is to enclose the receptacle, switching device, etc and form an outer housing-of pleasing and artistic appearance.
Withinthe base of the receptacle '8 is positioned a conductive plate ll,.preferably of copper, and :at one point of the periphery of this plate, it is turned up to provide a contact I positioned within the receptacle and having on the exteriorof the receptacle a binding post to which is affixed a terminal or terminal connection 16.
The receptacle 8 may be of anydesired shape, but for the purpose of illustration, I have shown itas provided near. its top with oppositely projecting lateral extensions I1. One of these extensions serves as a support for a spindle is which passes through the opposite walls thereof (see Figure 2) with a, nut-l9 at one end and at its other end a slip 'connection 20 by means of which it may be sprung into engagement with a shank 21 of amanually operable knob '22 positioned exteriorly of the shell [2. A gland 23 is associated with the spindle l8 so .as to preclude leakage of liquidIL adapted to be contained within the receptacle.
Attached-"to the spindle. l8 within the extension H is an arm 24 and an insulating bushin 25 is interposed between thearm and the spindle to insulate the latter .from the former. ZBy manipulation of the knob 22, the arm .24 may be swung from the full line position of Figure 1, wherein it. is shown above the surface of the liquid L, downwardly into engagement with the contact I5 which is submerged insaid liquid.
-Embracing the spindle 118 on the exterior of the receptacle 8 is a current switching device. This current switching device embodies an insulating block 26, secured in fixed position and on the outer surface of which are mounted three fixed contacts 21, 28 and 29. With these contacts a movable contact or wiper 30 cooperates. This wiper is mounted on an arm 3!, keyed to a sleeve 32, embracing the spindle [8 which has squared or dog connection with the shank 33 of a knob 34 positioned exteriorly of the shell, directly back of the knob 22. A light spring 35 impels the wiper in the direction of the face of theblock of insulation 26 on which the contacts 21, 28 and 29 I are positioned. By rotating the knob 34 the wiper 30 may be caused to engage the contacts 21, 28
energized.
Current is fed from a conventional plug 36, through an opening into the interior of the shell, where the two wires 31 and 38 thereof separate. The wire 31 is connected to the terminal 16 and passes therefrom to the hub 3| of the movable contact 30. The other wire 38 passes upwardly within the shell and through an opening 39 near the base of the colunm l into the interior of the column and thence upwardly through the column to the head 2 within which it is connected to one terminal of each of the lamp sockets 3, 4 and 5. From the other terminal of the socket 3 a wire 40 leads back through the column to the contact 29 of the switch block 26. Similarly Wires 4| and 42 lead from the other terminals of the sockets 4 and to the contacts 28 and 21, respectively. A wire 43 is connected to the wire 4| between the socket 4 and the contact 28 and leads from this wire 4| to the arm 24. This wire 43, together with the arm 24, liquid L and contact l5, collectively from a shunt circuit shunting the current switching device for the several bulbs.
Under normal conditions the arm 24 is in the position shown in Figure 1 wherein it lies wholly above the surface of the liquid L. Likewise the movable contact 30 is .in the position shown in this figure so that all circuits to the'bulbs are dead. When it is desired to turn on the bulbs without dimming, the knob 34 is rotated in a clockwise direction as viewed in Figures 1 and 3 to move the contact 30 into engagementwith'the contact 21. This completes the circuit through the bulb 5a and it will glow with maximum intensity. If the rotation of the knob is continued, the contact 30 will next engage with the contact 28 to turn on the bulb 4a and continued rotation of the knob will engage the contact 30 also with the contact 29, so that all three bulbs will glow brightly. Th'us either one, two or three lamps may be turned on at the will of the operator. r 3
However, should a dim light be desired,.the movable contact 30 may be returned to the position in Figure 1 to extinguish all of the bulbs and, while it remains in this position, theknob 22 may be rotated in a counterclockwise direction to correspondingly swing the arm 24 so that its end is caused to enter into the liquid L. As soon as this occurs, current will pass fromthe arm 24 through the liquid to the conducting plate l4, but with a resistance inversely to the distance between the end of the arm 24 and the plate [4.
In other, words, when just the end of the arm dipsinto the liquid, the current will, flow to the bulb 4a with maximum resistance in the line and consequently the lamp will glow dimly. The deeper the arm is depressed into the liquid, the closer it will approach to the contact [5 and its and 29 in succession, so that the electrical circuits next to be described may be accumulatively plate l4 and the resistance will be correspondingly lessened, so that the bulb 4a will glow more brightly. If the arm is brought into the dotted line position of Figure 1, wherein it actually engages the contact I5, there will be no interposed 'liquid resistance and consequently the bulb 4a will glow with its maximum intensity. Thus by manipulating the knob 22, the operator can dim the bulb 4a as desired.
This arrangement makes the lamp particularly useful either to give full illumination or as a night light where just enough light is required to permit one to see his way around.
Any appropriate liquid L may be used in the receptacle 8 and for convenience in replenishing this liquid, the cover 1 is provided with an upstanding filling tube 44 which extends to and terminates in an aperture in the shell. The open end of this filling tube is closed by a cap 45 having a. spring hinge 46 which normally holds it shut, but it may be manually opened when desired to permit liquid to be poured into the vessel. This spring closure also serves as a safety valve in the event that evaporation of the liquid L occurs at such a rate as to build up pressure in the vessel. This will not of course ordinarily occur, but might conceivably happen if the owner of the lamp should remove one of the bulbs and improperly use that socket to connect other elec trical appliances or a plurality of other lamps, as persons sometimes do.
If at any time access is desired to the switchin mechanism within the shell, this may be readily had by removing the screws I3 to release the shell. The shank 21 of the knob 22 is then withdrawn from theball end of the spindle i8 and both knobs may then be withdrawn to free the shell. The shell may then be raised above the top of the re ceptacle 8 to uncover the switching mechanism. At that time the cover I of the receptacle may be opened for access into the interior of the latter. The connection between the shank 2i and the spindle l8 may vary, but, for the purpose of illustration, the spindle is shown as having a ball end immediately adjacent which the spindle is circumferentially toothed, while the shank 2! has a socket with an internal annular bead and the wall of the shank is longitudinally slit so that the shank may be sprung over the ball end to move the bead apast the ball and thus secure the parts together. Between the bead and the free end of the shank are teeth corresponding to the teeth on the spindle and serving to interengage therewith to lock these parts for simultaneous rotation.
The invention has been shown in the accompanying drawings as associated with a table lamp, although in practice it may be incorporated with in a floor lamp or in any other conventional form of lighting device.
The foregoing detailed description sets forth the invention in its preferred practical form and the invention is to be understood as fully commensurate with the appended claims.
Having thus fully described the invention, what I claim as new and desire to secure by Letters Patent is:
l. A lamp comprising a receptacle adapted to contain an electrical resistance liquid, 9. column supporting at least one incandescent lamp bulb, an electrical circuit including said lamp bulb and also including a manually operable switch through which current may be fed directly to the lamp bulb, a shunt circuit connected across said switch and including a fixed contact submerged in the liquid in the receptacle, and a movable contact adjustable through said liquid toward and away from said submerged fixed contact, and means for manually adjusting said movable contact to interpose in the shunt circuit the resistance of more or less of the liquid contained in the receptacle at the will of the operator to vary the intensity of the bulb thus energized.
2. A lamp comprising a base provided with a receptacle adapted to contain a resistance liquid, a column extending from the base and supporting at least one lamp bulb, an electric circuit extending into the base and upwardly through the column to the lamp bulb and including, within the base, a manually operable switch to directly control the feed of current to the lamp bulb, a shunt circuit connected across the switch with one terminal of the circuit submerged in the resistance liquid and the other terminal of the circuit connected to an arm pivotally supported above the surface of the resistance liquid, and manually operable means for causing said arm to dip into the resistance liquid for the purpose of completing the shunt circuit through said liquid to the bulb, the length of the path of current through the liquid determining the intensity of the bulb when thus illuminated.
3. A lamp comprising a base provided with a receptacle adapted to contain a resistance liquid, a column extending from the base and supporting a plurality of lamp bulbs, an electrical circuit leading into the base and having a common feed wire extending through the base and through the column to one terminal of each of the several lamp bulbs in succession, a switch within the base comprising fixed and movable contacts, the fixed contacts being individually connected to the several bulbs and the movable contact being con-. nected to the common return of such circuit and the movable contact being manually movable to engage said fixed contacts accumulatively and in succession, in combination with a shunt circuit around the switch and including one of the bulbs, said shunt circuit having normally spaced terminals, one of which is submerged in the liquid in the receptacle and the other of which is in the form of an arm manually movable from a point above the surface of such liquid downwardly through the liquid and into contact with the other terminal at the will of the operator.
4. A lamp comprisin a base provided with a receptacle adapted to contain a resistance liquid, a column extending from the base and supporting a plurality of lamp bulbs, an electrical circuit leading into the base and having a common feed wire extending through the base and through the column to one terminal of each of the several lamp bulbs in succession, a switch within the base comprising fixed and movable contacts, the fixed contacts being individually connected to the several bulbs and the movable contact being connected to the common return of such circuit, and
the movable contact being manually movable to engage said fixed contacts accumulatively and in succession, in combination with a shunt circuit around the switch and including one of the bulbs, said shunt circuit having normally spaced terminals, one of which comprises a conductive plate at the bottom of the receptacle and is submerged in the liquid in the receptacle and the other of which is in the form of an arm manually movable from a point above the surface of such liquid downwardly through the liquid and into contact with the other terminal at the will of the operator.
5. A lamp comprising a receptacle adapted to contain an electrical resistance liquid, a column supporting at least one incandescent lamp bulb, an electrical circuit including said lamp bulb and also including a manually operable switch through which current may be fed directly to the lamp bulb, a shunt circuit connected across said switch and including a fixed contact submerged in the liquid in the receptacle, and a movable contact adjustable through said liquid toward and away from said submerged fixed contact, and means for manually adjusting said movable contact to interpose in the shunt circuit the resistance of more or less of the liquid contained in the receptacle at the will of the operator to vary the intensity of the bulb thus energized, said receptacle having a filler tube provided with a spring pressed closure adapted to open and relieve gaseous pressure if such becomes present in the receptacle.
6. A lamp comprising a base provided with a receptacle adapted to contain a resistance liquid, a column extending from the base and supporting a plurality of lamp bulbs, an electrical circuit leading into the base and havin a common feed wire extending through the base and through the column to one terminal of each of the several lamp bulbs in succession, a switch Within the base comprising fixed and movable contacts, the fixed contacts being individually connected to the several bulbs and the movable contact being connected to the common return of such circuit and the movable contact being manually movable to engage said fixed contacts accumulatively and in succession, in combination with a shunt circuit around the switch and including one of the bulbs, said shunt circuit having normally spaced terminals, one of which is submerged in the liquid in the receptacle and the other of which is in the form of an arm manually movable from a point above the surface of such liquid downwardly through the liquid and into contact with the other terminal at the will of the operator, said receptacle having a filler tube provided with a spring pressed closure adapted to open and relieve gaseous pressure if such becomes present in the receptacle.
PATRICK J. WALSH.
US644030A 1946-01-29 1946-01-29 Lamp Expired - Lifetime US2426907A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2509979A (en) * 1946-03-18 1950-05-30 Lyall G Marti Electric light fixture for fluorescent lamps
US2715197A (en) * 1954-02-10 1955-08-09 Broff Warren Du Lighting device
US3038060A (en) * 1960-06-29 1962-06-05 Plummer L Diehl Child's night light
US20070201228A1 (en) * 2006-02-27 2007-08-30 Mark Young Post Lantern Energy Conversion Device
US20130016507A1 (en) * 2011-07-12 2013-01-17 John Yeh D Shaped Induction Lamp Retrofit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2509979A (en) * 1946-03-18 1950-05-30 Lyall G Marti Electric light fixture for fluorescent lamps
US2715197A (en) * 1954-02-10 1955-08-09 Broff Warren Du Lighting device
US3038060A (en) * 1960-06-29 1962-06-05 Plummer L Diehl Child's night light
US20070201228A1 (en) * 2006-02-27 2007-08-30 Mark Young Post Lantern Energy Conversion Device
US20130016507A1 (en) * 2011-07-12 2013-01-17 John Yeh D Shaped Induction Lamp Retrofit

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