US1743846A

US1743846A - Dustproof lighting unit

Info

Publication number: US1743846A
Application number: US269653A
Authority: US
Inventors: Leroy C Doane
Original assignee: Miller Co
Current assignee: Miller Co
Priority date: 1928-04-13
Filing date: 1928-04-13
Publication date: 1930-01-14
Anticipated expiration: 1947-01-14

Description

INVENTOR Zergy Do /1e u ATTORNEY Jan. 14, 1930.

1.. c. DOANE DUSTPROOF LIGHTING UNIT Filed April 15. 1928 Patented Jan. 14, 1930 1 UNITED PATENT OFFICE LEROY 6-. DOANE, F MERIDEN, CONNECTICUT. T-HE MILLER GGMPANY, OF MERIDEN, CONNECTICUT; A CORPQRATION"0F GON-NECIICUT DUfiTPRQQF LIGHTING UNIT Application filed April 13 The present invention relates to dustproof lighting units and is more particularly directed' toward a lighting unit suitable for use where it is exposed and subject, 119 Wind, weather and vibration.

The present invention contemplates an; inclosed lighting unit suitable for the [above purposes wherein a single inclosing glass globe is mounted about the light source in 10 such a manner that the entrance of dust or rain is efl'ectively prevented while at the same time the inclosingjglobe maybe readily released for inspection, clean-ing or replacement. The invention also contemplates a 5suitable form of globe support which cap able of being made. out of heavy rugged parts which will withstand vibration and at the same time provide a weatherproof inclosure for the electrical parts of the unit.

Another object of the invention is to provide 'a unit of this nature in which it is unnecessary to use any tools when removing or replacing a globe.

The accompanying drawings show, for purposes of illustrating the present inventioni one of the many possible embodiments in which the invention maytake form, it being understood that the drawings are illus trative of the invention rather than limiting the same.

In these "drawings:

Figure 1 is a vertical sectional view through the lighting unit with parts in ele vation; and

Figure 2 is a horizontal section view on the line 22 of Figure 1,

In the present form of construction the upper part. of the lighting unit ismade in the 01111- of a canopy 1. -0- havingia downwardly nd inw rdly on ers ng por n ind c ted at 11, and provided with a. plurality of in ward-ly extending lugs 12% drilled. to receive screws 13. This canopy 1Q be conmeniently made in the form of a heavy wl lgg aluminum casting andisdetachably fastened to aring-likemombrlk. Y

h r g-likemember 14 functions, in the present, form of construction, as both a socket support anda globe support. Ashore shown 50 it is provided with an inwardly directed was. senat 26916 3- flange 15v in which is mounted a lamp socket indicated at 16. The screws 13 are threaded into suitabletapped holes in this flange so as to fasten the members 10 and li together.

un t may h s ppo by ns Of P- porting rods fastened to a crossbar 18 and provided at their lower ends with nuts 19,, The lower portion of the ring-like member L4: provided, as here shown, with three downwardly and outwardly extendinglugs- 29. Each of these lugs has a horizontal portion 2 1, a vertical portion 22 and a lower horiaontaL foot pe e 2 The upper ce. o the horizontal portion 21 is notched as indicated at 2 1 to receive a comparatively rigid sheet metal finger This finger extends inward- 1y indicated in the drawing. and passes through a slot 25in the lug. The inner upper end of the finger 25 is provided with a hooked end'26 which is passed up into the Slot the-lug, the finger 25 also extending outwardly and downwardly as indicated. The free end 27 of the finger extends beyond the foot 23 The finger issupported and held in place on the lug bymea'ns of a coiled, spring 25 wound around'a pin 29 which is fastened to the" finger and which passes through a hole in the foot 23 as indicated.

The outer surface of the ring-like member 14 is as here shown slightly larger in diameter than the lower portion of the canopy. This outer surface of the ring is threaded as indicated at 30 and a cover ring.- 31 is threaded onto the ring14. This cover ring may be moved up and down by turning it along the threads. The ring extends outward'ly and downwardly as shown and the skirt -32 of the ring isprovided with a gasket member '33. This gasket may be made up in the form of" astrip of woven asbestos tubing 34 which is drawn over a split spring ring,

34. The split ring will hold the gasket in place in the skirt of the cover ring 31 and provide a very eilective dustproo-f joint when the globe is inserted in pla'c' To insert the globe in place the ring-31 is revolvedbackwardly. to raise it up to the dot and d ash li'ne position. A conventional globe such as indicated a' ahas a lip or rim as indicated at 36 and an upper covering wall 37. The opening in the upper part of the globe is the proper size to permit passing it up over two of the lugs and fingers and turning it about so that the shade will rest on all three of the fingers. The springs 28 are preferably stiff enough to support the globe without permitting the fingers to rest on the feet of the lugs. This provides a resilient support for the globe and the springs equalize the pressure on the undersurfaceof the globe.

The ring 31 is then revolved to lower it to bring it to the full line position whereupon the edge of the gasket comes against the upper surface of the glass globe opposite the ends 27 of the fingers 25. Sufiicient pressure may be applied to compress the springs 28- slightly, thereby insuring that the globe is securely held in place on the globe supporting fingers. a V

The present form of lighting unit is one wherein the globe may be readily inserted or removed and the entrance of dust, water, in-

sects or other foreign matter is effectively prevented by reason of the construction use-d. There will be no tendency for the globe to loosen or rattle when the unit is subjected to successive vibration such as found on station platforms, and the theft of lamps made more difiicult.

It is obvious that the invention may be embodied in many forms and constructions within the scope of the claims, and I wish it to be understood that the particular form shown is but one of the many forms. Various modifications and changes being possible, I do not otherwise limit myself in any way with respect thereto.

I claim:

1. A lighting unit comprising a socket support having a plurality of downwardly and outwardly extending lugs, and yieldingly supported fingers carried by the lugs, the fingers extending outwardly to engage under the rim of a shade.

2. A lighting unit comprising a socket support having a plurality of downwardly and outwardly extending lugs, yieldingly supported fingers carried by the lugs, the fingers extending outwardly to engage under the rim of a shade, the outside of the socket support being threaded, a threaded cover carried thereby, and a glass shade resting on the spring fingers, with the heel of the shade above the fingers, the cover having a skirt passing down outside the heel of the shade.

3. A lighting unit comprising a socket support having a plurality of'downwardly and butwardly extending lugs, yieldingly supported fingers carried by the lugs, the fingers extending outwardly to engage under the rim of a shade, the outside of the socket support being threaded, a threaded cover carried thereby, a glass shade resting on the sprlng fingers, with the heel of the shade above the fingers, the cover having a skirt passing down outside the heel of the shade, and a gasket carried inside the skirt of the cover for engaging with the upper surface of the glass =shade to form a dusttight unit.

4. A lighting suit comprising an externally threaded socket support,a downwardly opening lampsocket therein, downwardly and outwardly extending shade supporting fingers carried by the socket support, and a cover cover ring threaded onto thesocket support and having a skirt adapted to be brought down close to the fingers to clamp a shade therebetween, or raised to permit insertion or removal of a shade.

1 5. A lighting unit comprising an externally threaded socket support, a downwardly opening lamp socket therein, downwardly and outwardly extending shade supporting fingers carried by the socket support, a cover ring threaded onto the socket support and having a skirt adapted to be brought down close to the fingers to clamp a shade therebetween, or raised to permit insertion or removal of a shade, and a detachable canopy carried above the socket support.

6. A lighting unit comprising an externally threaded two part socket support, a downwardly opening lamp socket therein, shade supporting fingers carried by the lower part of the socket support and adapted to extend outwardly underneath a-shade, and a clamping ring threaded on the'support and adapted to be brought against the upper surface of a shade resting on the fingers, the portions of the support above and below the threads being of larger diameter than the threads and the two part support being separable to per- ,mit placing the threaded clamping ring thereon.

7. A dustproof enclosed lighting unit comprising an enclosing globe having an opening at the top, a globe support carrying spring supported fingersengageable underneath the upper surface of the globe for yieldably supporting the globe, and a ring threaded onto the globe support and having a skirt above the upper surface of the globe and opposite the fingers.

8. A dustproof enclosed lighting unit comprising an enclosing globe having an opening at the top, a globe support carrying spring supported fingers engageable underneath the upper surface of the globe for yieldably supporting the globe, a ring threaded onto the globe supportyand a gasket carried by the ring and engageable with theupper surface bf the globe when the ring is threaded downwardly. V i

9, A dustproof enclosed lighting unit comprising an enclosing globe having an upper wall provided with an opening, a fixed globe support having fingers engageable under the upper wall of the globe, a ring threaded on the globe support'and closing the space between its the globe and the support, and a gasket carried by the ring and passing downfoutside the heel of the globe to engage the upper surface of the globe.

10. In a lighting unit, a ring-like member having downwardly and outwardly extending lugseach provided with slots to receive shade supporting fingers, shade supporting fingers mounted therein and disposed above the lugs, and springs for supporting the fingers.

11. In a lighting unit, a ring-like member having outwardly and downwardly extending lugs carried from the lower edge of the ring, the lugs having outwardly extending feet, fingers overlying the lugs and extending outwardly beyond the feet, the lugs each having a notch to receive the upper portion of a finger and a slot to receive the upper ends thereof, the upper end of the finger being hooked into the slot, and a spring interposed between the foot of the lug and the finger for yieldably supporting the finger above the lug.

12. A lighting unit adapted to be mounted near the ceiling, and comprising a downwardly and inwardly converging :canopy detachably fastened to a downwardly extending externally threaded ring carrying downwardly and outwardly extending shade supporting lugs, and a cover ring threaded onto the first ring, the cover ring being confined between the canopy and first ring when these parts are fastened together.

Signed at Meriden, in the county of New Haven and Stateof Connecticut, this 11th day of April, 1928.

LEROY C. DOANE.