US3847333A - Method and apparatus for centering a luminaire support - Google Patents
Method and apparatus for centering a luminaire support Download PDFInfo
- Publication number
- US3847333A US3847333A US00329514A US32951473A US3847333A US 3847333 A US3847333 A US 3847333A US 00329514 A US00329514 A US 00329514A US 32951473 A US32951473 A US 32951473A US 3847333 A US3847333 A US 3847333A
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- United States
- Prior art keywords
- arrangements
- support
- movement
- biasing
- post
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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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
- F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
- F21V21/36—Hoisting or lowering devices, e.g. for maintenance
- F21V21/38—Hoisting or lowering devices, e.g. for maintenance with a cable
Definitions
- These force imparting arrangements are interconnected to one another such that off-center movement of the luminaire support causes one or more of the arrangements to act in restoring the latter to its original position while, at this time, the remaining arrangements are automatically and temporarily removed so as not to interfere with the recentering function of the acting arrangements.
- the present invention relates generally to a method and apparatus for maintaining a ring-like object in a predetermined location, and more particularly to an improved method and apparatus for maintaining a luminaire support assembly centeredabout a support post.
- each of the aforedescribed luminaires was generally maintained, that is, cleaned and/or put in proper working order while the luminaire remained in place at the top of its support post.
- This meant that a man had to have suitable equipment to reach the luminaire and take the time to do so, each of which contributed to high maintainence costs.
- the lighting industry has provided ring-like luminaire assemblies which are .capable of traveling up and down their respective support posts, thereby allowing the luminaire to be easily and rapidly brought to the ground for maintainence purposes. This, in turn, has simplified the procedure required in maintaining theluminaires and therefore has reduced the cost'of such a procedure.
- an object of the present invention is to provide an improved method and apparatus for maintaining a ring-like object sup port in a predetermined location.
- Another object of the present invention is to provide an improved method and apparatus for centering a ring-like object support about the axis of a longitudinal member, especially as the support travels longitudinally along the member.
- Still another object of the present invention is to provide a method and apparatus of the last-mentioned type which does not aid in preventing the restoration of an object to'its predetermined location.
- Yet another object of the present invention is to provide an improved luminaire assembly featuring the above-stated method and apparatus.
- the present invention provides a method and apparatus for maintain ing a ring-like object support in a predetermined location.
- This is accomplishedin accordance with the present invention, by utilizing a plurality of interconnected location maintaining arrangements which apply appropriately directed forces to the ring-like object support.
- at least one of the location maintaining arrangements will act to automatically restore the latter to its predetermined location.
- the remaining location maintaining arrangement will simultaneously move in a predetermined fashion. In accordance'with the present invention, this simultaneous and predetermined movement prevents the remaining arrangements from providing forces tending to inhibit restoration of the ring-like support to its predetermined location.
- the aforedescribed operation is especially suitable for maintaining a ring-like luminaire support centered about the axis of alongitudinal support post as the luminaire support travels longitudinally along the latter.
- the plurality of force imparting location maintaining arrangements are connected with the luminaire support such that corresponding ends of the arrangements are movable in a biased forward direction towards and a rearward direction away from the axis of the support, that is, towards and away from the support post.
- the location maintaining arrangements are interconnected to one another, as stated above, such that movement of any one of the corresponding ends in its rearward direction causes substantially simultaneous movement of the other ends in their respective rearward directions.
- the luminaire support does move off center
- at least one of the arrangement ends will move rearwardly while remaining in contact with the post and automatically act to recenter the luminaire support.
- the remaining arrangements ends will simultaneously move rearwardly and out of contact with the post, thereby preventing these remaining arrangements from providing forces tending to inhibit recentering of the luminaire support.
- FIG. 1 is a side elevational view of the luminaire'assembly including a ring-like luminaire support and an apparatus for maintaining the support in a predetermined location, in accordance with the present invention.
- FIG. 2 is a sectional view of the assembly of FIG. 1 taken generally along line 22 in FIG. 1.
- FIG. 3 is an enlarged perspective view illustrating a feature of the location'maintaining apparatus shown in FIG. 1.
- FIG. 4 is a schematically illustrated side elevational view of the assembly of FIG. 1 with the ring-like luminaire support centered about the axis of the luminaire support post.
- FIG. 5 is a vectorial diagram of the forces provided by the location maintaining apparatus for maintaining the ring-like support in a centered position around the DETAILED DESCRIPTION
- the luminaire assembly includes a longitudinal support post 12 preferably displaying but not limited to a circular cross'section, a head frame 14 suitably mounted to one end of the support post and a ring-like support 16 to which one or more conventional luminaires 18 are attached, the ring-like support being positioned around post 12.
- support post 12 will be verticallypositioned with the head frame 14 located at the top thereof.
- the ring-like luminaire support 16 is connected to head frame 14 by a plurality of support cables 20.
- conventional means (not shown) are preferably provided to cooperate with the support cables for moving the ring-like support between a top or raised position adjacent the head frame and a bottom or lowered position near the bottom of the support post.
- the luminaire support 16 is preferably held in a position parallel with the head frame 14 as it moves up and down the support post. This may be accomplished by providing at least three cables 20, all of which maintain equal lengths between the support and head frame.
- a suitable mechanism may also be provided for locking the luminaire support 16 to the head frame when the support is in its raised position, thereby fixing the luminaires well above the ground. I
- the luminaire assembly also includes an apparatus 22 for centering the ring-like support 16 around post 12 and for maintaining the ring-like support in this position, especially as the support travels up and down the post.
- support 16 is preferably circular in cross section.
- it may be of any suitable closed'loop cross-sectional configuration, so long as the present invention functions in the manner set forth herein.
- the term ring-like when referring to the luminaire support 16 is intended to describe any suitable closed-loop shaped support and is not intended to limit the support to a circular cross section.
- apparatus 22 acting on post 12 supplies a plurality of multidirectional forces to the luminaire support 16 (preferably radially) for maintaining the latter in predetermined position and preferably in a centered position with respect to post 12.
- the luminaire support does, for example, move radially off center
- at least one of those center maintaining forces opposing such movement will automatically work to restore the support to its centered position.
- those forces which are provided by apparatus 22 and which otherwise tend to inhibit recentering of the luminaire support are, eliminated.
- the force or forces provided by apparatus 22 for restoring the luminaire support to its centered position are not inhibited from achieving this end by any other forces provided directly by the center maintaining apparatus.
- the restoring force or forces may be completely free from resistance.
- the restoring force or forces may, in fact, meet with resistance from external forces such as, for example, wind.
- apparatus 22 includes four location, and more particularly centermaintaining arrangements 24a, 24b, 24c and 24d. (See FIG. 2), all of which are connected with the luminaire support 16 for movement along respective predetermined paths relative to the support. More specifically,
- each of these center-maintaining arrangements are pivotally mounted to the luminaire support such that a corresponding end of each is movable in a radial direction towards and away from the axis of the support.
- each of these center-maintaining arrangements is biased in particular pivotal direction such that its radially movable end is biased towards the center of the luminaire support and in forcible contact with luminaire support post 12. This is preferably accomplished by the utilization of a single compression spring 26, as will become apparent hereinafter.
- the four center-maintaining arrangements are interconnected to one another such that movement of any one of the arrangements along its predetermined path causes simultaneous and similar movement of the other arrangements along their respective paths.
- apparatus 22 both provides and eliminates various ones of the aforedescribed forces at the appropriate time so as to maintain the luminaire support in a centered position with respect to the luminaire support post.
- the ring-like luminaire support 16 preferably comprises a central cylindrical portion 28 and annular flanges 30 and 32 connected with the cylindrical portion, preferably integrally so, and extending radially outwardly from opposite ends thereof.
- the aforedescribed luminaire or luminaires 18 are preferably mounted, in a conventional manner, to the flange portions 30 and 32 while the lower flange portion 30 also provides support for arrangement 22, as will be shown below.
- the center-maintaining arrangement 24a as illustrated best in FIG. 3 includes a T'bar 34a comprising a leg portion 36a rigidly connected at one end to a head portion 38a, the latter preferably being U-shaped in cross section (at least at opposite ends), as best seen in FIG. 1.
- the T-bar is positioned directly below the lower annular flange 30 of luminaire support 16 so as to extend radially outwardly therefrom. In this position, the otherwise free end of the T-bars leg portion 36a is connected with the lower flange 30 by means of a conventional pivot-connecting arrangement 40a so that the entire T-bar is pivotally movable along a predetermined path, as indicated by arrow 42a in FIG. 2.
- center-maintaining arangement 24a includes an elongated and rigid extension arm 44a disposed in a substantially the same plane as the T-bar and welded or otherwise fixedly connected at one end to the pivoted end of leg portion 36a.
- the extension arm is sufficiently curvilinear in shape and sufficiently long so that its otherwise free end is positioned to substantially one side of the axis of luminaire support 16 and in a plane approximately 90 around the luminaire support from the T-bar.
- a roller 46a having its axis oriented in a direction perpendicular to the axis of the luminaire support comprises part of and is suitably mounted to the otherwise free end of extension arm 44a.
- both the extension arm 44a and roller 46a of center-maintaining arrangement 24a are movable along with T-bar 36a.
- the roller supporting end of the extension arm as well as the roller itself are movable in a substantially radial path inwardly for forwardly towards and outwardly or rearwardly away from the center of luminaire support 16, as generally indicated by the two-way arrow 48a.
- the T-bar is biased in a clockwise direction, as viewed in FIG. 2, as will be described in more detail hereinafter.
- the roller is biased inwardly and in contact with one side of luminaire sup port post 12. The roller will remain in contact with the post as luminaire support 16 travels up and down the ladder, so long as the luminaire support is centered around the post.
- the remaining center-maintaining arrangements 24b, 24c and 24d are preferably substantially identical in construction to arrangement 24a, like components of all the arrangements being designated by like reference numerals, with the suffix letters a, b, c, and d designatingthe components associated with respective arrangements.
- the remaining three location maintaining arrangements are preferably positioned in a common plane with arrangement 24a and have their respective T-bars pivotally mounted to the lower flange 30 of luminaire support 16 by respective pivot connecting means 401), 40c and 40d, all of which are preferably identical to previously described pivot-connecting ar rangement 40a.
- the T-bar of arrangement 24b is preferably located approximately 90 to one side of element 24a; the T-bar of arrangement 24d being located approximately 90 to the opposite side of arrangement 24a and the T-bar of arrangement 24c being located directly across from arrangement 24a.
- all four roller preferably intersect a common circle, the center of which lies on the axis of the luminaire support.
- arrangement 22 includes four tie rods 50, 52, 54 and 56 interlocking the various T-bars to one another. More specifically, tie rod 50 is connected at opposite ends to adjacent ends of head portions 3% and 38b. Tie rod 52 is connected at opposite ends to adjacent ends of head portions 38b and 380. Tie rod 54 is connected at opposite ends to adjacent ends of head portions 38c and 38d. Finally, tie rod 56 is connected at opposite ends to adjacent ends of head portions 38d and 38a. Each end of each tie rod may be connected with its associated head portion in any suitable manner. For example, as illustrated best in FIGS. 1 and 3, conventional pivot-connecting arrangements, generally designated by the reference numeral 58, are provided for pivotally connecting the ends of the tie rods to corresponding head portions, thereby allowing the tie rods to pivot at their connected ends.
- pivotal movement of, for example, T-bar 34a in a given direction causes substantially simultaneous and substantially identical pivotal movement of the remaining T-bars 38b, 38c and 38d in the same direction, as generally indicated by the arrows 42b, 42c and 42d, respectively (see FIG. 2).
- the rollers 46a, 46b, 46c and 46d will also move substantially si multaneously and in substantially the same manner. More specifically, as, for example, roller 48a moves towards or away from the center of luminaire support ring 16, indicated by two-way arrow 48a, the other three rollers will simultaneously move towards and away from the center, as indicated by two-way arrows 48b, 48c and 48d in FIG. 2. Hence, all four rollers will remain on a common circle which expands as the rollers move away from the center and which contracts when the rollers move toward the center.
- arrangement 22 includes a compression spring 26 provided for biasing the movement of center-maintaining arrangement 24a through 24d.
- this compression spring is positioned around a center bar 60 which is suitably pivotally connected at one end to the counter-clockwise end of head portion 38a, as viewed in FIG. 2.
- the other end of the center bar is slidably disposed through a washer eye 62, which is conventionally mounted to the bottom of the ring-like luminaire support and which acts as a stopper for one end of the compression spring.
- This latter end .of center bar 641i is preferably threaded so as to receive a nut 64 or othersuch means for preventing the center rod from slipping out of the washer eye.
- the other end of the center rod is also preferably threaded so as to receive a second nut 66 which provides an adjustably positioned stopper for the other end of compression spring 26.
- apparatus 22 preferably includes conventional means (not shown) which adjustably limits the radially inward movement of the rollers so as to define a circle having a minimum diameter preferably slightly larger than the diameter of post 12 at the top thereof.
- conventional means not shown
- the rollers are automatically removed from the post as support ring 16 approaches and engages with the locking mechanism at head frame 14. This, in turn, allows the support ring to align properly with the locking mechanism, especially since there might be a slight twisting movement of the ring as it moves up the post.
- roller 46a exerts a'force on the luminaire support in the direction of arrow F, for preventing the luminaire support from moving in an opposing direction.
- rollers 46b, 46c and 46d respectively exert forces in the direction of arrows F F and F, for preventing the luminaire support frommoving in directions opposing these forces.
- the ring-like luminaire support is held on center with respect to support post 12.
- the luminaire support does, in fact, move radially off center. As stated above, this can happen for many reasons. For example, the wind, if sufficiently great, can directly move the luminaire support off center. More than likely, however, the ring-like luminaire support will tend to move off center as it travels up or down the support post if the latter is not completely straight. This can be caused by, for example, the wind bending the post or, for example, due to warpage of the latter.
- the support post is shown slightly bent to the left and the luminaire support is shown moving up the post causing the support to move off center to the right, as viewed in the FIGURE.
- This force in fact, is a restoring ,force for restoring the support to its center position.
- apparatus 22 preferably includes four equally circumferentially spaced center-maintaining arrangements and therefore for equally spaced rollers.
- the apparatus could, however, be modifed to include more or less of these arrangements and therefore more or less rollers.
- at least two location-maintaining elements are necessary.
- An apparatus for maintaining a ring-like object support in a predetermined location around the external surface of a post comprising:
- each of said interconnecting means is a rod interconnecting one arrangement with an adjacent arrangement.
- biasing means includes a longitudinal spring, said spring being disposed within a plane parallel with the common plane of said rod means.
- An apparatus for maintaining a ring-like object support in a predetermined location around the external surface of a post comprising:
- a. a plurality of location maintaining arrangements connected with said object support and including corresponding ends, said arrangements being connected with said support such that said ends are movable in a forward direction towards and a rearward direction away from the axis of said support;
- c. means interconnecting said arrangements to one another such that movement of any one of said ends in its rearward direction. causes substantially simultaneous movement of the other ends in their respective rearward directions, whereby movement of at least one of said ends in its rearward direction while remaining in contact with said longitudinal member causes at least one other of said ends to move out of contact with said longitudinal member when said support is positioned around the latter.
- a luminaire assembly comprising:
- a ring-like support member concentrically disposed'around said post and movable along the length thereof;
- At least one luminaire connected with and supported by said support member d. a plurality of location maintaining arrangements connected with said support member and including corresponding endsadapted to engage against said post, said arrangements being connected with said object support such that said corresponding ends are movable in a forward direction towards and a rearward direction away from said post;
- said location maintaining arrangements are pivotally connected with said support member for providing said movement of said ends.
- said arrangements comprise at least four arrangements substantially equally circumferentially spaced about said circular path
- each of said arrangements including wheel means adapted to be biased in contact with said post.
- means including a longitudinal spring connected with said location maintaining arrangements for biasing each of the ends of said arrangements in said forward direction and in contact with said longitudinal member when said support is positioned around said longitudinal member, said spring extending in a direction parallel to said common plane;
- a plurality of rods substantially disposed within a plane parallel to said common plane, said rods interconnecting said arrangements to one another such that movement of any one of said ends in its rearward direction causes substantially simultaneous and substantially equal movement to the other ends in their respective rearward directions and such that movement of any one of said ends in its forward direction causes substantially simultaneous and substantially equal movement of the other ends in their respective forward directions.
- An apparatus adapted for centering a ring-like object support about the axis of a longitudinal member
- said apparatus comprising:
- a. a plurality of circumferentially spaced location maintaining arrangements pivotally connected with said object support and including corresponding ends, said arrangements being connected with said support for pivotal movement in a common plane perpendicular to the axis of said member such that said ends are movable in a forward direction towards and rearward direction away from the axis of said member;
- a plurality of rods having opposite end portions re- 17.
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- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Description
Claims (17)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00329514A US3847333A (en) | 1973-02-05 | 1973-02-05 | Method and apparatus for centering a luminaire support |
ZA740590A ZA74590B (en) | 1973-02-05 | 1974-01-29 | A method and apparatus for centering a luminaire support |
AU65092/74A AU479342B2 (en) | 1973-02-05 | 1974-02-01 | A method and apparatus for centering a luminaire support |
CA191,627A CA1020512A (en) | 1973-02-05 | 1974-02-04 | Method and apparatus for centering a luminaire support |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00329514A US3847333A (en) | 1973-02-05 | 1973-02-05 | Method and apparatus for centering a luminaire support |
Publications (1)
Publication Number | Publication Date |
---|---|
US3847333A true US3847333A (en) | 1974-11-12 |
Family
ID=23285783
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00329514A Expired - Lifetime US3847333A (en) | 1973-02-05 | 1973-02-05 | Method and apparatus for centering a luminaire support |
Country Status (3)
Country | Link |
---|---|
US (1) | US3847333A (en) |
CA (1) | CA1020512A (en) |
ZA (1) | ZA74590B (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3977639A (en) * | 1975-06-16 | 1976-08-31 | Johns-Manville Corporation | Free fall safety assembly for use with a luminaire raise-lower apparatus |
US4043910A (en) * | 1974-09-10 | 1977-08-23 | Allied Colloids Limited | Removal of phosphorous from waste water |
US4092707A (en) * | 1976-11-08 | 1978-05-30 | Millerbernd Paul A | High level light supporting and light lowering means |
US4348717A (en) * | 1977-07-25 | 1982-09-07 | General Electric Company | Luminaire lowering device with centering means |
US4661894A (en) * | 1984-08-31 | 1987-04-28 | Metaltec Corporation | Stabilizing device for luminaire support ring |
US20050052876A1 (en) * | 2003-09-10 | 2005-03-10 | Halverson Rex W. | Umbrella mounted chandelier |
US7393124B1 (en) * | 2005-05-04 | 2008-07-01 | Kenneth Riley Williams | Architectural mast-mounted support system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1898074A (en) * | 1930-08-21 | 1933-02-21 | Carol Supplies Inc | Antifriction bearing |
US3555689A (en) * | 1968-12-19 | 1971-01-19 | Schlumberger Technology Corp | Centralizing and well-calipering apparatus for well tools |
US3633980A (en) * | 1970-04-15 | 1972-01-11 | Ametek Inc | Support bearing |
US3670159A (en) * | 1970-05-13 | 1972-06-13 | Paul A Millerbernd | High level light pale including means for lowering lights for servicing |
-
1973
- 1973-02-05 US US00329514A patent/US3847333A/en not_active Expired - Lifetime
-
1974
- 1974-01-29 ZA ZA740590A patent/ZA74590B/en unknown
- 1974-02-04 CA CA191,627A patent/CA1020512A/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1898074A (en) * | 1930-08-21 | 1933-02-21 | Carol Supplies Inc | Antifriction bearing |
US3555689A (en) * | 1968-12-19 | 1971-01-19 | Schlumberger Technology Corp | Centralizing and well-calipering apparatus for well tools |
US3633980A (en) * | 1970-04-15 | 1972-01-11 | Ametek Inc | Support bearing |
US3670159A (en) * | 1970-05-13 | 1972-06-13 | Paul A Millerbernd | High level light pale including means for lowering lights for servicing |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4043910A (en) * | 1974-09-10 | 1977-08-23 | Allied Colloids Limited | Removal of phosphorous from waste water |
US3977639A (en) * | 1975-06-16 | 1976-08-31 | Johns-Manville Corporation | Free fall safety assembly for use with a luminaire raise-lower apparatus |
US4092707A (en) * | 1976-11-08 | 1978-05-30 | Millerbernd Paul A | High level light supporting and light lowering means |
US4348717A (en) * | 1977-07-25 | 1982-09-07 | General Electric Company | Luminaire lowering device with centering means |
US4661894A (en) * | 1984-08-31 | 1987-04-28 | Metaltec Corporation | Stabilizing device for luminaire support ring |
US20050052876A1 (en) * | 2003-09-10 | 2005-03-10 | Halverson Rex W. | Umbrella mounted chandelier |
US7393124B1 (en) * | 2005-05-04 | 2008-07-01 | Kenneth Riley Williams | Architectural mast-mounted support system |
Also Published As
Publication number | Publication date |
---|---|
AU6509274A (en) | 1975-08-07 |
ZA74590B (en) | 1974-12-24 |
CA1020512A (en) | 1977-11-08 |
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