US 3586280 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
United States Patent Inventor Alfred P. Parduhn 1924 Plymouth Lane. Oklahoma City. Okla. 73120 Appl. No. 54,162
Filed July 13, 1970 Patented June 22, 1971 SIGNAL MASTARM BRACKET 4 Claims, 3 Drawing Figs.
US. Cl 248/214, 248/230,340/119 Int. Cl ..F16m13/02 Field of Search 1. 248/221,
214, 230, 226, 226 D. 291; 240/73 BJ; 52/40; 340/1 l9;240/63;211/182 Referenees Cited UNlTED STATES PATENTS Spencer Primary Examiner.1. Franklin Foss ArmrneyWarren F. B. Lindsley 240/73 248/230 340/1 19 X 248/230 X 248/230 X ABSTRACT: A mastarm bracket for signal lights which is vertically and laterally adjustable while maintaining a selected position on a column support.
PATENTED M22 mm INV ENTOR. ALFRED E I HEMIHA/ r ll'llllnIl-l lll BY M/WM ../l TTORNE Y SIGNAL MASTARM BRACKET BACKGROUND OF THE INVENTION lncreased motor vehicle speeds and increased congestion on streets and highways bring about requirements for more accurately positioning signal lights for traffic control. Safety experts studying statistics have demonstrated that proper design of column-supported lighting and traffic signal lamps have a favorable impetus on accident avoidance.
Fixed lighting of streets and highways for traffic control is being modernized at an accelerating rate and many of the newer installations are requiring modern pole, shaft and column designs which require extensive changes in the mounting hardware for lighting and traffic control lamps. Maintenance of these lighting fixtures and the associated adjustments must be easily handled with a minimum of expense.
FIELD OF THE INVENTION This invention is directed to the modern shaft, pillar and column configurations used for street and highway lighting and traffic control and particularly to mastarm brackets for adjusting in a plurality of angular and vertical positions the position and direction of light ray emission of lighting and signal lamps.
DESCRIPTION OF THE PRIOR ART At the present time poles, shafts, columns and the like em-. ployed to support lamps and traffic signal lights are provided with mastarm brackets which are limited in adjustment possibilities so that once the column and mastarms are positioned the direction of the rays of the lamps used for lighting and traffic controls are fixed. These mastarms are formed before assembly at the site and consequently do not'lend themselves to adjustments for taking care of particular conditions of the site or traffic conditions of that area.
SUMMARY OF THE INVENTION In accordance with the invention claimed an improved mastarm bracket is provided employing an assembly of parts which when used in the claimed combination provide vertical and lateral adjustment of the lamps heretofore not possible at the site.
It is, therefore, one object of this invention to provide an improved mastarm bracket.
Another object of this invention is to provide an improved bracket for mastarms which provide vertical and lateral adjustment of any given vertical setting.
Further objects and advantages of the invention will become apparent as the following description proceeds and the features of novelty which characterize this invention will be pointed out with particularity in the claims annexed to and forming part of this specification.
BRIEF DESCRIPTION OF THE DRAWING The present invention may be more readily described by reference to the accompanying drawing in which:
FIG. I is a view of the vertical column, crossarm, signal lamps and mastarm bracket forming a traffic signal pole and embodying the invention;
FIG. 2 is an enlarged cross-sectional view of FIG. 1 taken along the line 2-2; and
FIG. 3 is an enlarged exploded perspective view of the signal lamps and mastarm bracket.
DESCRIPTION OF PIREFERRED EMBODIMENT The present invention relates to mastarm brackets for signal lamps and lights adjustably mounted on pillars, poles, columns or the like for lighting and traffic control.
Referring more particularly to the drawing by characters of reference, FIG. I discloses'a traffic signal pole which is intended to be representative of any shaft, pillar, post or column vertically arranged or otherwise which is utilized to support and house wires, connections, control devices, lamps, traffic signal lights, and so forth for pedestrian and traffic comfort and control. The traffic signal pole 10 may comprise a hollow tapered steel shaft 11 having a base 12 and a top or capital 13. A tapered hollow mastarm 14 is suitably secured to the top 13 of shaft II by means of an adjustable split bracket 15 of adequate strength, shape and size to support the mastarm l4 and is shown as being electric are welded to the large end of the mastarm.
Suitable signal heads 17 are fastened to the mastarm at spaced intervals, as required, for supporting and positioning a plurality of traffic signal lamps or devices 18. i
In accordance with the invention claimed, the signal heads 17 are each supported on a U-shaped clamp 19. comprised of a pair of tubular leg members 20 and 21 interconnected by a tubular or straight member 22. Leg member 20 comprises a union 23 having an elbow 24 threadly mounted to it and the top end of member 22, as shown, and a second elbow 25. The free end of elbow 25 is connected to the top of signal head 17. Leg member 21 comprises a T-shaped member 26 threadly connected to the lower end of member 22 and to an elbow 27. Elbow 27 is connected at its other end to the lower end of signal head 17. Thus, signal head 17 may be rotatably mounted on an axis formed by'elbows 25 and 27 substantially parallel to but spaced from the longitudinal axis of member 22. The other arm of'the T of member 22 may be closed by a weatherproof wiring connector. Wires (not shown) are inserted through this connector into the signal head to provide electric current to lamps I8. The connector is tightened down upon the wire to prevent water from getting into the signal head.
As shown in FIGS. 2 and 3 a T-shaped member 29 is slidably mounted along member 22 and clamped in any given position along its length by setscrews 30. Leg 31 of member 29 is threadly connected to a clamp or bracket 32 which is arranged for clamping around the mastarm l4.
Bracket 32 comprises a split member having two semicylindrical parts 33 and 34 each of which are provided with a pair of apertured ears 35 at diagonally disposed points. The cars on part 33 are positioned in juxtapositioned relationship to ears on the part 34 for axially aligning the apertures in the ears so that suitable bolts 36 and nuts 37 may clamp the parts together around the mastarm 14. This bracket holds the signal hanging devices 17 at selected positions along the mastarm. Bracket 32 is also provided with a collar 38 for threadly engaging leg 31 of T-shaped member 29.
Thus, a simple arrangement is provided for hanging signal devices 17 which permits lateral movement along the mastarm 14, vertical movement of devices 17 axially of the vertical shaft ll and lateral movement to the vertical axis of shaft 11 by simple adjustments while the devices are pole mounted.
While, in accordance with the provisions of the statues, there has been illustrated and described the best form of the invention known, it will'be apparent to those skilled in the art that changes may be made in the structure described without departing from the spirit of the invention as set forth in the appended claims.
What I claim is:
1. A pole-supported electrical device comprising:
a lamp fixture, and
a bracket for securing said fixture to a mastarm, said bracket comprising,
a U-shaped clamp providing a pair of spacedly arranged legs interconnected by a straight member, said fixture being rotationally mounted between said legs,
a T-shaped member slidably mounted on said straight member for adjustably positioning at a given place along said straight member,
a mastarm clamp comprising two cooperating parts for surrounding said mastarm,
fastening means for holding said parts together around said mastarm, and
axis parallel to the longitudinal axis of said straight member.
4. The combination set forth in claim 1 wherein said fastening means comprises apertured ears on each of said cooperating parts of each receiving a nut and bolt clamping said parts around said mastarm.