US3263071A - Light fixture shield - Google Patents

Light fixture shield Download PDF

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US3263071A
US3263071A US339171A US33917164A US3263071A US 3263071 A US3263071 A US 3263071A US 339171 A US339171 A US 339171A US 33917164 A US33917164 A US 33917164A US 3263071 A US3263071 A US 3263071A
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Prior art keywords
shield
projections
housing
ledge members
edges
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US339171A
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William C Fabbri
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SMITHCRAFT CORP
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SMITHCRAFT CORP
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Priority to US339171A priority Critical patent/US3263071A/en
Priority to GB31614/64A priority patent/GB1072120A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F21V17/16—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening by deformation of parts; Snap action mounting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes

Definitions

  • the standard procedure for inserting and supporting the shield should, as far as possible, continue to be used.
  • the typical shield has a length slightly less than the length of the housing opening and a width slightly greater than the width of that opening.
  • the procedure involves sliding the shield widthwise up into the housing at a slight angle to the horizontal until it extends into the housing laterally beyond its normal position so that the opposite lengthwise edge can be raised and clear the housing edge. Then, after the entire shield is raised into the opening, a slight lateral shifting brings the two lengthwise edges back into position to rest upon the sides of the housing for support.
  • the above procedure does not allow the use of a shield that is longer than the housing opening.
  • Plastic shields for narrow model fixtures to be installed by the standard procedure are presently made by the relatively inexpensive extrusion or injection molding procedures in which the shield has a uniform cross-section along its length.
  • shields for wider fixtures have been more susceptible, of course, to widthwise sagging and as a result it has been thought impossible to make them so economically.
  • all of the wide model plastic shields being made today, even by the most progressive and largest companies, are made with the crosssection of the shield being varied along its length to give the center a special upwardly dished shape, either conical or pyramid-like, whereby the shield is stiffened against sagging. Because such shapes are extremely expensive, the wide shield has been many times more costly than a shield half the same Width.
  • the invention "avoids the varied cross-section technique of the prior art and instead employs a novel structure and system in no way dependent upon the cross-section or other features of the shape of the main shield body.
  • the invention lies in discovering the usefulness of the fact that a wide shield of such a thickness as to be subject to widthwise sag, when manually supported by grasping it in the conventional position at the center of one of the long sides, will sag or wraok slightly but distinctly lengthwise, as well as widthwise, due to the unsupported weight of the ends of the shield. This lengthwise end sagging causes the ends of the shield to draw in slightly and automatically without any special attention by the person raising the shield.
  • the invention takes advantage of this phenomenon, and tab projections are employed in the middle of the ends of the shield, which make the flattened overall length of the shield, at the projections only, longer than the length of the housing opening, contrary to what has previously been thought to be necessary.
  • FIG. 1 is a perspective view of the entire shield
  • FIG. 2 is a lengthwise vertical cross-section showing the shield wracked lengthwise due to the unsupported weight of the ends while centered in the fixture ready to be released to final installed position;
  • FIG. 3 is a view similar to FIG. 2, but with the shield in its installed position;
  • FIG. 4 is an enlarged, lengthwise vertical section showing the lower end construction of the housing and the end of a shield in the position of FIG. 3;
  • FIG. 5 is a view similar to FIG. 4, but with the shield in the position of FIG. 2;
  • FIG. 6 is a horizontal section through the line 6-6 in FIG. 4;
  • FIG. 7 is a perspective view showing the shield partially inserted into the fixture
  • FIG. 8 is a perspective view similar to FIG. 7, with the shield fully installed;
  • FIG. 9 is a widthwise cross-section with the shield in the position of FIG. 2;
  • FIG. 10 is a widthwise cross-section with the shield in its installed position.
  • the shield shown in FIG. 1 is of the open box type, with elongated rectangular main body 10, downwardly and outwardly sloping sides 11, and end caps 13. Sides 11 have laterally extending side edges 12, which edges overlap the longitudinal edges of the housing to support the shield in its installed position (FIG. 10).
  • the housing 20 While the details of the housing 20 generally are not critical, it will have inwardly extending ledge members 23, or their equivalents, along its lowermost longitudinal or side edges as well as ledge members 22 along its lowermost end edges.
  • the shield is of greater width than the housing opening to allow side edges 12 of the shield to overlap side ledge members 23 when installed, as shown in FIGS. 8 and 10.
  • the length of the shield is less than that of the housing opening so that lower edges 14 of the shield end caps 13 will be adjacent to, but will not overlap end ledge members 22, as shown in FIGS. 3, 4, and. 8.
  • tab projections 15 of much less width W (FIG. 6) than that of the shield extend lengthwise outwardly from end caps 13 in a generally horizontal manner, said projections 15 located approximately midway between sides 11 of the shield, and just above lower edges 14.
  • the overall length of the shield, through the projections, when the shield is flattened, is greater than the length of the housing opening, while the overall length of the shield, through all other locations, is less than the length of the opening.
  • projections 15 will overlap ledge members 22 of the housing. In this manner, cold flow sag along the end edges 14 is eliminated.
  • said edges 14 align with ledge portions 22, thus giving a flush transition between the shield and the housing end plates and improving the appearance from below, as best shown in FIGS. 3 and 4.
  • the main body of the shield can have a uniform widthwise cross-section throughout its length and can be formed as a simple linear extrusion and practical thickness of plastic.
  • Shield end caps 13 will normally be manufactured separately from the main body and sides of the shield, and then cemented or otherwise secured in position.
  • the shield To install the shield, it is grasped centrally along one side as shown in FIG. 7, and the opposite side is inserted into the fixture, laterally beyond its final position (see FIG. 9). Automatically the shield undergoes lengthwise wracking, because the weight of the ends is not supported, at least along the one side being grasped, and this wracking draws the projections 15 inwardly sufiiciently close together that the overall length of the shield, through the projections, becomes less than the length of the housing opening, so that as the grasped side of the shield is swung up into the fixture, the projections easily clear ledge members 15, as shown in FIGS. 2 and 5. The shield is then shifted laterally to center the shield, and bring edges 12 over ledge members 23 (FIG. 9).
  • the overall length of the shield, exclusive of the projections is 46 inches, with the overall width belng 23 inches.
  • the main body comprises acrylic plastic extruded 0.120 inch thick.
  • the tab projections extend outwardly from the shield end caps by Ms inch and overlap ledge member 22, when installed, by an amount varying from A inch to about inch.
  • the outermost edge of the tab is /1 inch wide and the sides of the tab extend inwardly toward the end cap at a 30 taper. All upper edges of the tab are rounded with a inch radius to a d in the installation process.
  • the thickness of the tab 1s A; inch. I
  • a flexible wide model rectangular light diffusing shield adapted to be suspended in a bottom opening of a light fixture housing by side supporting means cooperatin g with the sides of the shield,
  • said shield having tab projections located on its ends and said fixture having inwardly extending ledge members located at the ends of said housing, said projections, when said shield is installed, extending over and resting upon said ledge members to support the ends of said shield, said shield having a length exclusive of said projections slightly shorter than the length of the housing opening between said ledge members, said projections located. spaced substantially from both sides of the shield to divide widthwise the ends of the shield into a plurality of unsupported segments each substantially narrower than the width of said shield,
  • said shield adapted to be installed while supported at its middle, the unsupported ends of said shield causing said shield to automatically wr-ack lengthwise to allow said projections to pass upwardly beyond said ledge members, said wracking disappearing as said grasped side is left to rest upon said side supporting means.
  • a flexible Wide model rectangular plastic light diffusing shield adapted to be suspended in an open bottomed housing having inwardly extending ledge members along its lowermost side and end edges,
  • said shield having a width greater than the width of the housing opening between its side ledge members, the sides of said shield overlapping and resting upon said side ledge members when said shield is installed,
  • said shield having tab projections on its ends, said pmjections, when said shield is installed, extending laterally over and resting upon said end ledge members,
  • said shield having a length exclusive of said projecto Wrack lengthwise to allow said projections to pass tions slightly shorter than the length of said housing upwardly beyond the end ledge members of said opening between its end ledges, said projections therehousing, said Wracking disappearing as said grasped by dividing widthwise the ends of said shield into side is left to rest upon said ledge members.

Description

July 26, 1966 w. c. FABBRI 3,263,071
LIGHT FIXTURE SHIELD Filed Jan. 21. 1964 5 Sheets-Sheet 1 July 26, 1966 w. c. FABBRI 3,263,071
LIGHT FIXTURE SHIELD Filed Jan. 21, 1964 3 Sheets-Sheet 2 July 26, I966 c. FABBRI 3,263,071
LIGHT FIXTURE SHIELD Filed Jan. 21. 1964 5 Sheets-Sheet s United States Patent 3,263,071 LIGHT FIXTURE SHIELD William C. Fabbri, Peabody, Mass, assignor to Smithcratt Corporation, Chelsea, Mass., a corporation of Massachusetts Filed Jan. 21, 1964, Ser. No. 339,171 5 Claims. (Cl. 240-5111) This invention relates to plastic light diifusing shields for wide model fluorescent light fixtures and in particular to a shield in which the cold flow sag problem is solved without the structural complexity or expense as sociated with previous efforts toward sag elimination.
For a number of years now shields or lenses for elongated fluorescent fixtures have been made of plastic rather than of the heavier sheet glass set in a frame. As with the glass shields, the plastic shields have been supported in the standard manner by their lengthwise edges, with the widthwise edges left unsupported to allow insertion and removal. But because the plastic in practical thicknesses is less rigid than glass and subject to a progressive deformation commonly known as cold flow, a serious difficulty has been encountered with wide model ttixtures, e. g., fixtures of the 24 inch module, due to progressive widthwise cold flow sagging of the shields, which eventually spoils their appearance.
This problem is by no means as simple of solution as might appear at first impression. A very basic design consideration arises out of the requirement that any such fixtures be foolproof in the sense that anyone, regardless of how unskilled, and with no prior instruction, should be able to remove a shield from the fixture to change a bulb, and replace the shield. Therefore, no supporting devices necessitating special actuating manipulations should be employed, and movements of the shield during its installation should be very simple. Additionally, it is important that the insertion of the shield should involve movements occupying a minimum of vertical space in the housing.
For the above reasons, and others, the standard procedure for inserting and supporting the shield should, as far as possible, continue to be used. For this procedure, the typical shield has a length slightly less than the length of the housing opening and a width slightly greater than the width of that opening. The procedure involves sliding the shield widthwise up into the housing at a slight angle to the horizontal until it extends into the housing laterally beyond its normal position so that the opposite lengthwise edge can be raised and clear the housing edge. Then, after the entire shield is raised into the opening, a slight lateral shifting brings the two lengthwise edges back into position to rest upon the sides of the housing for support. Obviously, the above procedure does not allow the use of a shield that is longer than the housing opening.
Plastic shields for narrow model fixtures to be installed by the standard procedure are presently made by the relatively inexpensive extrusion or injection molding procedures in which the shield has a uniform cross-section along its length. But shields for wider fixtures have been more susceptible, of course, to widthwise sagging and as a result it has been thought impossible to make them so economically. Rather, all of the wide model plastic shields being made today, even by the most progressive and largest companies, are made with the crosssection of the shield being varied along its length to give the center a special upwardly dished shape, either conical or pyramid-like, whereby the shield is stiffened against sagging. Because such shapes are extremely expensive, the wide shield has been many times more costly than a shield half the same Width.
Accordingly, it is a principal object of this invention to provide a new inexpensive shield for wide fluorescent lighting fixtures having means for overcoming sagging and particularly one which permits formation by inexpensive techniques.
In accomplishing this object the invention "avoids the varied cross-section technique of the prior art and instead employs a novel structure and system in no way dependent upon the cross-section or other features of the shape of the main shield body. In part, the invention lies in discovering the usefulness of the fact that a wide shield of such a thickness as to be subject to widthwise sag, when manually supported by grasping it in the conventional position at the center of one of the long sides, will sag or wraok slightly but distinctly lengthwise, as well as widthwise, due to the unsupported weight of the ends of the shield. This lengthwise end sagging causes the ends of the shield to draw in slightly and automatically without any special attention by the person raising the shield. The invention takes advantage of this phenomenon, and tab projections are employed in the middle of the ends of the shield, which make the flattened overall length of the shield, at the projections only, longer than the length of the housing opening, contrary to what has previously been thought to be necessary. The ordinary action by a person in raising the shield int-o the opening, due to the aforementioned lengthwise wracking under the influence of the unsupported weight of the ends of the shield, actually causes these projections to move inwardly sufliciently to clear the ends of the housing, and then when the person shifts the shield towards him and lets it drop into position to rest on its two long edges, the
ends of the shield receive support by these long edges, lengthwise sag or wracking is relieved, and the pro jections move outwardly sufficiently to engage the ends of the housing and thus support the edges of the shield and prevent its widthwise sagging, the shield at its ends then acting as if it were only two narrow shields coupled together rather than a single wide one. It is found that though cold flow still may occur in the middle of the shield area, this does not detract from appearance, this latter effect being due to the fact that the casual observer looking up to the fixture cannot detect variations from straightness where, as in the case at the center of a shield but not at its edges which lie next to the ceiling or housing edges, there is no straight ref erence with which to compare it.
A preferred embodiment of the invention is set out in the following detailed description and drawings, in which:
FIG. 1 is a perspective view of the entire shield;
FIG. 2 is a lengthwise vertical cross-section showing the shield wracked lengthwise due to the unsupported weight of the ends while centered in the fixture ready to be released to final installed position; j
FIG. 3 is a view similar to FIG. 2, but with the shield in its installed position;
FIG. 4 is an enlarged, lengthwise vertical section showing the lower end construction of the housing and the end of a shield in the position of FIG. 3;
FIG. 5 is a view similar to FIG. 4, but with the shield in the position of FIG. 2;
FIG. 6 is a horizontal section through the line 6-6 in FIG. 4;
FIG. 7 is a perspective view showing the shield partially inserted into the fixture;
FIG. 8 is a perspective view similar to FIG. 7, with the shield fully installed;
FIG. 9 is a widthwise cross-section with the shield in the position of FIG. 2;
FIG. 10 is a widthwise cross-section with the shield in its installed position.
Referring to the drawings, the shield shown in FIG. 1 is of the open box type, with elongated rectangular main body 10, downwardly and outwardly sloping sides 11, and end caps 13. Sides 11 have laterally extending side edges 12, which edges overlap the longitudinal edges of the housing to support the shield in its installed position (FIG. 10).
While the details of the housing 20 generally are not critical, it will have inwardly extending ledge members 23, or their equivalents, along its lowermost longitudinal or side edges as well as ledge members 22 along its lowermost end edges. The shield is of greater width than the housing opening to allow side edges 12 of the shield to overlap side ledge members 23 when installed, as shown in FIGS. 8 and 10. On the other 'hand, the length of the shield is less than that of the housing opening so that lower edges 14 of the shield end caps 13 will be adjacent to, but will not overlap end ledge members 22, as shown in FIGS. 3, 4, and. 8.
According to the invention, tab projections 15 of much less width W (FIG. 6) than that of the shield extend lengthwise outwardly from end caps 13 in a generally horizontal manner, said projections 15 located approximately midway between sides 11 of the shield, and just above lower edges 14. The overall length of the shield, through the projections, when the shield is flattened, is greater than the length of the housing opening, while the overall length of the shield, through all other locations, is less than the length of the opening. When the shield is installed in the fixture, projections 15 will overlap ledge members 22 of the housing. In this manner, cold flow sag along the end edges 14 is eliminated. At the same time, due to the location of projections 15 above edges 14, said edges 14 align with ledge portions 22, thus giving a flush transition between the shield and the housing end plates and improving the appearance from below, as best shown in FIGS. 3 and 4.
The main body of the shield can have a uniform widthwise cross-section throughout its length and can be formed as a simple linear extrusion and practical thickness of plastic. Shield end caps 13 will normally be manufactured separately from the main body and sides of the shield, and then cemented or otherwise secured in position.
To install the shield, it is grasped centrally along one side as shown in FIG. 7, and the opposite side is inserted into the fixture, laterally beyond its final position (see FIG. 9). Automatically the shield undergoes lengthwise wracking, because the weight of the ends is not supported, at least along the one side being grasped, and this wracking draws the projections 15 inwardly sufiiciently close together that the overall length of the shield, through the projections, becomes less than the length of the housing opening, so that as the grasped side of the shield is swung up into the fixture, the projections easily clear ledge members 15, as shown in FIGS. 2 and 5. The shield is then shifted laterally to center the shield, and bring edges 12 over ledge members 23 (FIG. 9). As the shield is lowlered to rest on members 23 (FIG. 10), the upward force on the shield becomes uniformly distributed along both long edges 12 and the wracking disappears, with the result that projections 15 move apart to their installed position above ledge members 22, shown in FIGS. 3, 4 and 6.
It will be noted that the movements required to install the shield occupy very little vertical space; hence, bulbs 2.4 may be located close above the shield. To remove the shield from the fixture, the process is simply reversed.
More particularly, in the specific embodiment illustrated, the overall length of the shield, exclusive of the projections, is 46 inches, with the overall width belng 23 inches. The main body comprises acrylic plastic extruded 0.120 inch thick. The tab projections extend outwardly from the shield end caps by Ms inch and overlap ledge member 22, when installed, by an amount varying from A inch to about inch. The outermost edge of the tab is /1 inch wide and the sides of the tab extend inwardly toward the end cap at a 30 taper. All upper edges of the tab are rounded with a inch radius to a d in the installation process. The thickness of the tab 1s A; inch. I
Although the invention has been described in the context of a shield supported along its longitudinal edges through overlap with the housing, it is by no means limited to such a context, being applicable to any shield supported along one pair of opposite edges and generally free along its other edges.
What is claimed is: I
1. A flexible wide model rectangular light diffusing shield adapted to be suspended in a bottom opening of a light fixture housing by side supporting means cooperatin g with the sides of the shield,
said shield having tab projections located on its ends and said fixture having inwardly extending ledge members located at the ends of said housing, said projections, when said shield is installed, extending over and resting upon said ledge members to support the ends of said shield, said shield having a length exclusive of said projections slightly shorter than the length of the housing opening between said ledge members, said projections located. spaced substantially from both sides of the shield to divide widthwise the ends of the shield into a plurality of unsupported segments each substantially narrower than the width of said shield,
said shield adapted to be installed while supported at its middle, the unsupported ends of said shield causing said shield to automatically wr-ack lengthwise to allow said projections to pass upwardly beyond said ledge members, said wracking disappearing as said grasped side is left to rest upon said side supporting means.
2. The shield of claim 1 in which there are two of said tab projections, one located on each end of said shield substantially centrally widthwise.
3. The shield of claim 1 in which said tab projections have a substantially small widthwise extent relative to the width of said. shield.
4. The wide model rectangular plastic light diffusing shield of claim 1 wherein said shield has a width greater than the width of the housing opening, the sides of said shield overlapping and resting upon the sides of said housing opening when said shield is installed.
5. A flexible Wide model rectangular plastic light diffusing shield adapted to be suspended in an open bottomed housing having inwardly extending ledge members along its lowermost side and end edges,
said shield having a width greater than the width of the housing opening between its side ledge members, the sides of said shield overlapping and resting upon said side ledge members when said shield is installed,
said shield having tab projections on its ends, said pmjections, when said shield is installed, extending laterally over and resting upon said end ledge members,
said shield having a length exclusive of said projecto Wrack lengthwise to allow said projections to pass tions slightly shorter than the length of said housing upwardly beyond the end ledge members of said opening between its end ledges, said projections therehousing, said Wracking disappearing as said grasped by dividing widthwise the ends of said shield into side is left to rest upon said ledge members. unsupported segments each substantially shorter than 5 h id h of id hi ld, References Cited by the Examiner said projections located centrally widthwise on the ends UNITED STATES PATENTS of said shield and spaced upwardly from the lowermost edges of said shield ends, said shield ends there- 315830O 11/1964 Van Steenhoven IMG 5111 X by being adapted to abut said end ledge members 10 3192381 6/1965 Zurawski et 240*5111 X when said shield is installed, said shield adapted to be installed While grasped at the NORTON ANSHER P'zmary Exammer' middle of one of its sides, the unsupported ends of C. R. RHODES, Assistant Examiner. said grasped side causing said shield automatically

Claims (1)

1. A FLEXIBLE WIDE MODEL RECTANGULAR LIGHT DIFFUSING SHIELD ADAPTED TO BE SUSPENDED IN A BOTTOM OPENING OF A LIGHT FIXTURE HOUSING BY SIDE SUPPORTING MEANS COOPERATING WITH THE SIDES OF THE SHIELD, SAID SHIELD HAVING TAB PROJECTIONS LOCATED ON ITS ENDS AND SAID FIXTURE HAVING INWARDLY EXTENDING LEDGE MEMBERS LOCATED AT THE ENDS OF SAID HOUSING, SAID PROJECTIONS, WHEN SAID SHIELD IS INSTALLED, EXTENDING OVER AND RESTING UPON SAID LEDGE MEMBERS TO SUPPORT THE ENDS OF SAID SHIELD, SAID SHIELD HAVING A LENGTH EXCLUSIVE OF SAID PROJECTIONS SLIGHTLY SHORTER THAN THE LENGTH OF THE HOUSING OPENING BETWEEN SAID LEDGE MEMBERS, SAID PROJECTIONS LOCATED SPACED SUBSTANTIALLY FROM BOTH SIDES OF THE SHIELD TO DIVIDE WIDTHWISE THE ENDS OF THE SHIELD INTO A PLURALITY OF UNSUPPORTED SEGMENTS EACH SUBSTANTIALLY NARROWER THAN THE WIDTH OF SAID SHIELD, SAID SHIELD ADAPTED TO BE INSTALLED WHILE SUPPORTED AT ITS MIDDLE, THE UNSUPPORTED ENDS OF SAID SHIELD CAUSING SAID SHIELD TO AUTOMATICALLY WRACK LENGTHWISE TO ALLOW SAID PROJECTIONS TO PASS UPWARDLY BEYOND SAID LEDGE MEMBERS, SAID WRACKING DISAPPEARING AS SAID GRASPED SIDE IS LEFT TO REST UPON SAID SIDE SUPPORTING MEANS.
US339171A 1964-01-21 1964-01-21 Light fixture shield Expired - Lifetime US3263071A (en)

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