Title:
Easily changeable filter holder
United States Patent 3871752


Abstract:
A combination is disclosed which includes a housing for supporting a light source; support means removably secured to said housing for supporting a filter with respect to said housing, with said support means comprising a split ring-like member having first and second ends biased toward one another whereby said ring-like member frictionally engages said housing, and manually graspable release means for temporarily enlarging the aforenoted ring-like member whereby the ring-like member can be easily removed from such housing when it is desired to replace the filter supported thereby.



Inventors:
HABINGER MAX
Application Number:
05/389521
Publication Date:
03/18/1975
Filing Date:
08/20/1973
Assignee:
HYGRO DYNAMICS INDUSTRIES, INC.
Primary Class:
Other Classes:
24/484, 359/818
International Classes:
F21V17/16; G02B7/00; (IPC1-7): G02B7/00
Field of Search:
350/311-319,245,251,252,257,57,58,64 240
View Patent Images:
US Patent References:
2874430Clamp1959-02-24Coldren
2090086Signaling device1937-08-17Weiner
1775180Light screen for the lens of photographic cameras1930-09-09Worsching
1754282Color-screen accessory for cameras1930-04-15Owens



Primary Examiner:
Stern, Ronald J.
Assistant Examiner:
Henry, Jon W.
Attorney, Agent or Firm:
Lerner, David, Littenberg & Samuel
Claims:
What is claimed is

1. In combination:

2. The combination of claim 1 wherein said split ring member includes a plurality of securing means for securing said other end of said expansible biasing means so that said expansible biasing means may be adjustably positioned with respect to said split ring member, whereby the force generated by said expansible biasing means may be varied.

3. The combination of claim 2 wherein said securing means of said split ring member comprises a plurality of apertures spaced thereabout, and said other end of said biasing means is received in a preselected one of said apertures in accordance with the biasing force desired for said biasing means.

4. In combination:

5. The combination of claim 4 wherein said first and second ends of said split ring member are biased toward one another by the resiliency of the material comprising said split ring member.

6. The combination of claim 4 wherein said split ring member includes a plurality of securing means for securing said other end of said expansible biasing means so that said expansible biasing means may be adjustably positioned with respect to said split ring member, whereby the force generated by said expansible biasing means may be varied.

Description:
FIELD OF THE INVENTION

This invention relates to lighting fixtures, and more particularly to a filter holder which can be easily removed from an associated light housing without the necessity of physically touching said housing.

BACKGROUND OF THE INVENTION

In the photographic profession, it is, or course, well known that high-intensity lamps are frequently used to facilitate the taking of pictures. It is equally as well known that a variety of filters are employed in connection with such lamps and that such filters must be frequently interchanged to obtain particular results. Accordingly, those in the industry have devised various arrangements for supporting a filter with respect to a lamp enclosure in such a manner that the filter may be removed and changed at will. Typical prior art arrangements are representatively shown in U.S. Pat. Nos. 2,616,030; 2,621,283; 2,785,291; 2,878,374; and 2,943,187. Such prior art structures, however, suffer from various drawbacks, including the difficulty of manipulation, complexity of mechanism, and high cost of manufacture.

Additionally, it will be appreciated that an enclosure such as a reflective bowl for a high-intensity lamp becomes very hot when the lamp is being used. This problem further complicates the problem of moving and changing filters associated therewith since it is virtually impossible and extremely dangerous to touch the lamp enclosure during the filter changing operation. Unfortunately, various ones of the prior art schemes for interchanging filters have the further drawback of requiring the operator to hold the lamp enclosure during the filter changing operation.

SUMMARY OF THE INVENTION

In contradistinction to the prior art, the instant invention provides a simple arrangement for quickly and easily changing filters on a lamp enclosure without the necessity of touching such lamp enclosure. As will be described in greater detail, at the heart of the instant invention is a split ring-like member which supports a filter with respect to the lamp enclosure and which includes manually graspable release means for temporarily enlarging the ring-like member when it is desired to remove same from the lamp enclosure and change the filter carried thereby.

OBJECTS OF THE INVENTION

Accordingly, it is an object of the instant invention to provide a simple, easily operable arrangement for changing filters associated with a lamp enclosure.

Another object of the instant invention is to provide such an arrangement which can be easily operated without the necessity of touching the lamp enclosure.

Other objects of the instant invention as well as a further understanding thereof may be had by referring to the following description and drawings.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

FIG. 1 is an exploded prospective view of the invention hereof.

FIG. 2 is a side view, partially in elevation and partially in prospective, further illustrating the invention hereof.

FIG. 3 is a side elevational view of the instant invention in its assembled condition.

DETAILED DESCRIPTION

Turning to the Figures wherein like numerals are used to designate like elements, FIG. 1 shows a typical light enclosure or housing 10, frequently known as a reflective bowl, within which is appropriately supported a light source (now shown). As can be seen, the housing in generally cylindrical in nature and terminates in an outer annular portion 12 against which is urged the desired filter 14 in a manner to be further described.

The supporting arrangement for carrying the filter 14 and urging it against the outer extremity portion 12 of the enclosure 10 is broadly designated 16 and comprises a generally cylindrical split ring-like member 18 having first and second ends 20 and 22 which are normally biased toward one another to maintain the cylindrical shape illustrated. This bias may be maintained by the natural resiliency of the material comprising the split ring-like member, typically metallic, and, as will be further described, may be supplemented by an expansible biasing spring 24.

As can best be seen in FIG. 1, the split ring-like member 18 includes an inturned annular flange 26 for supporting the filter 14. It will be appreciated that the rim 28 of the filter 14 will, in fact, be sandwiched between the aforenoted flange 26 and the extremity portion 12 of the enclosure 10 when the ring-like member 18 is removably secured to the enclosure 10 in the following manner.

It should be noted that the smallest diameter of the ring-like member 18 (when the first and second ends 20 and 22 thereof immediately confront one another) is slightly less than the diameter of the cylindrical end 30 of the enclosure 10. In securing the filter supporting ring-like member 18 to the enclosure 10, the operator simply telescopes it on the cylindrical end 30 thereof and, in so doing, the slight difference in diameters therebetween forces the ring-like member 18 to slightly open, such that a small space 32 (Fig. 3) will now exist between the confronting end portions 20 and 22. Of course, the natural resiliency of the ring 18, together with the additional biasing spring 24 to be further described, will attempt to return the ring-like member 18 to its initial smaller diametered configuration, and thereby frictionally retain the ring-like member 18 around the cylindrical portion 30, thereby properly positioning the filter 14 with respect to the housing 10.

The manually graspable release means for temporarily enlarging the ring-like member 18 when it is desired to remove the ring-like member 18 and change the filter 14 comprises first and second generally L-shaped members 34 and 36, respectively. The first member 34 includes a base portion having a first segment 38 secured on the first end 20 of the ring-like member 18 and a second intervally extending segment 40 which freely overlaps the second end 22 of the ring-like member 18. An outwardly directed leg portion 42 extends from the end of the aforementioned second segment 40. In like fashion, the second L-shaped member 36 includes a base portion having first segments 44 secured to the second end 22 of the ring-like member 18 and second segments 46 freely overlapping the first end of the ring-like member 18. An outwardly directed leg portion 48 extends from the second segments 46.

Because of the aforementioned relationship, it should be appreciated that when one squeezes the leg portions 42 and 48 toward one another in the direction of the arrows shown in FIG. 2, the net result will be to urge the ends 20 and 22 of the ring-like member 18 away from one another to thereby temporarily further enlarge the diameter of the ring-like member 18 whereby it can be easily slid off the cylindrical end 30 of the housing 10. Of course, once the ring-like member 18 has been removed from the housing 10, the filter 14 can be removed and replaced with the entire filter-changing operation requiring only the squeezing of the projections 42 and 48 toward one another and not requiring the operator to handle the housing 10.

To further bias the ends 20 and 22 of the ring-like member 18 toward one another, the aforenoted expansible spring 24 is provided. One end of the spring 50 is secured to the outstanding leg 48 and as best seen in FIG. 3, the other end 52 of the spring 24 is secured to the ring-like member 18 by being inserted in a preselected one of a plurality of apertures 54, 56 or 58 in accordance with the amount of tension desired for the spring 24. In this manner, the amount of frictional force developed on the cylinder portion 30 of the housing 10 can be easily varied.

Thus, there has been described an extremely simple, easy to operate arrangement for changing filters employed in connection with lamps and floodlights. In addition to being extremely simple and inexpensive to manufacture, the supporting arrangement for the interchangeable filters is easily removable from the associated light housing without the necessity of handling the housing itself.

Although this invention has been described with respect to its preferred embodiments, it should be understood that many variations and modifications will now be obvious to those skilled in the art, and it is preferred, therefore, that the scope of the invention be limited, not by the specific disclosure herein, only by the appended claims.