US2866084A

US2866084A - Lighting unit

Info

Publication number: US2866084A
Application number: US640815A
Authority: US
Inventors: Ray F Lester
Original assignee: Crouse Hinds Co
Current assignee: Crouse Hinds Co
Priority date: 1957-02-18
Filing date: 1957-02-18
Publication date: 1958-12-23
Anticipated expiration: 1975-12-23

Description

R. F. LESTER LIGHTING UNIT Dec. 23, 1958 2 Sheets-Sheet 1 Filed Feb. 18, 1957 9 m m w 1L. A

E Q R Dec. 23, 1958 Filed Feb. 18, 1957 R. F. LESTER LIGHTING UNIT 2 Sheets-Sheet 2 INVENTOR.

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United States Patent LIGHTING UNIT Ray F. Lester, Syracuse, N. Y., assignor to Crouse-Hinds Company, Syracuse, N. Y., a corporation of New York Application February 18, 1957, Serial No. 640,815

2 Claims. (Cl. 240-112) This invention relates to industrial type vapor proof lighting units.

It is an object of this invention to provide a lighting unit wherein the reflecting shade is detachably secured to the lighting unit by a yieldable member economical to manufacture and which functions to effectively hold the shade to the unit during the relamping thereof.

The invention consists of the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views.

In the drawings Figure l is a cross section of the lighting unit.

Figure 2 is a cross section taken on line 2-2 of Figure 1.

Figure 3 is an enlarged detail view of the shade mounting means.

The lighting unit is composed of a canopy having a hub threaded at 11 at its upper end for the reception of a wire carrying conduit (not shown). The canopy is circular and couically shaped, and has a contact block 13 with contacts which engage the contacts of the receptacle 15 to form the necessary electrical connections to light the lamp 16, shown in hidden lines. The canopy is formed with an internal thread and has a flange 21 depending from the lower end of the canopy, which flange has an internal bead 25 for a purpose hereinafter described. Threadedly received in the canopy is a fitting 30. The fitting has an offset upstanding externally threaded annular flange 31 which is threaded into the canopy 10, and a lower depending annular flange 32 which is internally threaded for the reception of a complementally threaded globe 35. A ledge 36 is formed by the offset upstanding flange 31, and a gasket 37 is mounted on the ledge for a purpose hereinafter described. The fitting has a globe guard 40 mounted on the external surface of the depending flange 32. The globe guard has a hingedly mounted keeper 41 on its lower end, with a pair of spring-like holders 42 for holding the globe when the keeper is latched, as at 45, to the lower end of the globe guard.

A reflecting shade 50 has an inwardly extending portion 51 mounted on the ledge 36 above the gasket 37. Another gasket 52 is mounted on the upper surface of the inwardly extending portion 51, the

gaskets

37 and 52 acting in conjunction to hold the lamp shade 50 in the canopy, and to form a vapor tight joint between the fitting 30 and the canopy 10.

As will be seen from Figure 1, the depending flange 21 on the canopy is concentrically spaced from the upstanding flange 31 on the fitting 30, forming an annular space 60. An upstanding annular flange 65 on the shade 2,866,084 Patented Dec. 23, 1958 ice is received in said space 60. The flange 65 has an outwardly crimped portion 66. Received in the space between the internal bead 25 on the canopy, and the outwardly crimped edge 66 on the shade, is a coil spring 70, as will be seen in Figure 2. This coil spring acts to retain the shade 50 in the canopy 10 when the fitting 30 is removed from the canopy. When the fitting is removed from the canopy, it is merely necessary, should it be desired to remove the shade 50, to pull downwardly on the shade 50. This will exert a force on the coil spring 70 and tend to compress the individual coils of the spring into an elongated shape in order to allow the outwardly crimped portion 66 of the shade to pass by the internal head 25 of the canopy and out of the canopy 10. To insert the shade in the canopy, it is only necessary to push the shade into the canopy with enough force to overcome the coil spring 70 to compress the spring in order to allow the crimped rim 66 to slide over the coil spring.

in practice, it has been found that this method of yieldably retaining the shade in the canopy of the lighting unit is far more beneficial and desirable than pre-existing methods, since although the coil spring may be deformed, it has an elastic deformity-that is, it will not be permanently deformed from the compression on the spring from the shade 50. With pre-existing retainers made of rubber or the like, which were to be deformed in order to remove the reflecting shade, it often occurred that the retainers became permanently deformed after a certain amount of use, so that it became difficult to insert and remove the shade holder in the unit. Also, heat generated in the lighting unit often caused the rubber retainer to vulcanize to the parts, preventing removal of the shade. It will thus be seen that my construction obviates these difiiculties.

What I claim is:

1. A lighting unit comprising a cylindrical canopy ter minating in a depending annular flange formed at its lower edge with an internal head, a globe fitting detachably secured to said canopy and having a radial ledge confronting the under surface of said annular flange, said ledge terminating in an upstanding cylindrical flange .spaced radially inwardly from said annular flange and said head, a reflecting shade having a radial portion and an upstanding cylindrical portion, said cylindrical portion adapted for insertion in the space between said cylindrical flange of the globe fitting and said depending canopy flange, said radial portion adapted to be clamped between said ledge and said annular flange, the upper edge of the cylindrical portion of said shade being bent outwardly toward said canopy flange and being spaced inwardly and upwardly from said head, an annular metallic retaining member encircling said cylindrical portion of the shade intermediate the outwardly bent edge thereof and said bead and yieldingly engaging said canopy flange, said retaining member being compressible in a radial direction.

2. A lighting unit, as set forth in claim 1, wherein said annular metallic retaining member consists of a multicoil spring.

References Cited in the file of this patent UNITED STATES PATENTS 803,883 Dale Nov. 7, 1905 998,971 Legge July 25, 1911 1,027,848 Huston May 28, 1912 2,574,882 McDowell Nov. 13, 1951