US 3596226 A
Description (OCR text may contain errors)
United States Patent (72] Inventor Joel A. Meltur 3398 Fairway Road. Oceanside, N.Y. 11572 [2|] Appl. No. 846,903
 Filed Aug. 1, 1969  Patented July 27, 1971  ELECTRICAL POER TRACK AND SHOE /11/11/1/1/1/11. W EH '8 mtv'llllklyllllllllfi 3,061,810 10/1962 McCormick 339/22 R 3,089,042 5/1963 Hickey et 31.... 307/147 3,337,697 8/1967 Martin et al. 191/23 3,503,032 3/1970 Routh et al. 339/14 R FOREIGN PATENTS 1,288,609 2/1962 France 339/14 R Primary Examiner-Ernest R. Purser Assistant ExnminerRobert A. Hafer Attorney-Stoll and Stoll ABSTRACT: A track for wall mounting comprises two planeparallel conductors extending the length of the track. A shoe for engagement with the track embodies a narrow elongated extension having pickup contacts at opposite ends thereof adapted for engagement with the track conductors upon rotation of the extension after fitting into the track. A spring-urged locking plate engages the" track opening to prevent further rotation of the contact extension. The track enclosure and the locking plate may be conductors to provide a third line for grounded systems.
PATENTED m2? I97! SHEET 1 I}? 3 IIIIIIIII/I/ INVENTOR. JACK A MELTZER BY $3M A TTORI E YS PATENTEBJULZYIBII 3596.226
1N VENTOR. JACK A. NELTZER BY W J S A TTOlE/VEYS BACKGROUND OF THE INVENTION 1. Field of the Invention Electrical power distribution tracks and accessory pickup shoes.
2. Description of the Prior Art The prior art abounds with various devices to enable a power supply to be offered in an elongated dimension rather than at a single point as is the case with a common wall outlet. Some devices involve a plurality of outlets placed in side-byside relation, others involve a wire having insulation soft enough to be punctured at any location. Another device is shown by Glass U.S. Pat. No. 2,981,917: a tubular member has a slot for access to live contacts.
Summary of the Invention A flat track adapted for wall mounting includes a decorative outside covering which is preferably a conductor and two elongated conductors being plane-parallel and oppositely disposed about an opening in the track. Suitable insulation is provided between the conductors and the decorative exterior of the track.
Connection between the conductors and a power supply is provided by an end fitting having tongues which slide securely between the track covering and the contact insulation and which have extended spring shoes for contact with the conductors. Common screw terminals are provided in the end fitting for connection to a power supply wire.
An accessory pickup shoe utilizes an elongated extension having a reduced lateral dimension to fit within the track opening and opposite pickup contacts adapted to engage the track conductors upon 90 rotation of the accessory shoe. A locking plate having raised flanges engages the track and prevents further rotation of the accessory shoe except upon withdrawal of the plate from the track against a spring. A threaded collar may lock against the locking plate to prevent such withdrawal.
Brief Description of the Drawing FIG. 1 is a perspective view of the power track of the present invention with two accessory pickup shoes engaged therewith. The form of the accessories being lamps.
FIG. 2 is a side view of an accessory pickup shoe engaged with the power track which is shown in cross section.
FIG. 3 is a cross-sectional view of the power track and lamp accessory shoe shown in position for engagement into the track. The locking plate and collar are retracted.
F IG. 4 is a cross-sectional view taken across line 4-4 of FIG. 3.
FIG. 5 is a fragmentary top view of the power track and end fitting, partially cut away, with an accessory shoe in cross section shown mounted on the track.
FIG. 6 is a cross-sectional view of a portion of the power track as taken across line 6-6 of F10. 3.
FIG. 7 is a view similar to that of FIG. 6 but showing the accessory shoe locked into the power track.
FIG. 8 is a fragmentary top view of the power track with an outlet accessory shoe mounted thereon.
FIG. 9 is a cross-sectional view taken across line 9-9 of FIG. 8 and showing a plug in the outlet.
FIG. 10 is a view of the outlet accessory and track of FIG. 9 showing the locking collar retracted and the contact extension in full view.
FIG. 11 is a view similar to that of FIG. 10 but showing the accessory shoe rotated 90 FIG. 12 is a cross-sectional view across line 12-12 of FIG. 8 showing the locking collar retracted.
FIG. 13 is a similar view to that of FIG. 5 but showing a three wire connection with a three line accessory outlet shown in full view.
FIG. 14 is a cross-sectional view taken across line 14-14 of FIG. 13 showing in phantom the position of an endcap.
FIG. 15 is a cross-sectional view taken across line 15-15 of FIG. 13 with a three conductor plug.
FIG. 16 is a cross-sectional view taken across line 16-16 of FIG.15.
FIG. 17 is a fragmentary crosssectional view similar in position to that of FIG. 12 and showing indetail the third conductor connections. I I v 1 1 Description of Preferred Embodiments of the Invention Referring to the drawing, the present invention comprises a power track 10 for use with accessory pickup shoes 12 of varying descriptions. A lamp having adjustable swivel mounts 14 is a prime example. Power track 10 comprises an elongated outer member 16 having a flatback 16a for ease of placement against a wall or ceiling surface and a front portion 16b comprising a flat surface having a central longitudinal opening 16c therein. Running within and longitudinally of power track 10 are two conductors 18 located oppositely of opening 16c and having their respective planes parallel to each other in face-toface relation. Situated between conductors 18 and outer member 16 is an insulating sleeve 20 which also covers the bottom portion 16a of the track.
An end fitting 22 has tongues 24 adapted to slide firmly within power track 10 between outer member 16 and insulating sleeve 20 for secure joining of the end fitting to the power track. Two screw terminals 25 adapted to connect a power supply cord 26 join to spring contacts 28, each of which engages a conductor 18. Conductors 18 are accordingly connected to a power supply. End fitting 22 may be covered with decorative and insulating end covers 30 having snap fasteners 32 adapted to engage a hole 33 provided for the purpose in the end fitting.
Accessory shoe 12 comprises a central core 40 having a bottom extension 42 of elongated dimension sufficient when turned parallel to track opening 160 to be inserted therein and when rotated axially of core 40 sufficient to engage conductors 18 with contacts 44 provided for the purpose. Around core 40 is a locking plate 46 which is spring-urged toward'extension 42. Locking plate 46 is provided with central flanges or enlargements 48 adapted to enter track opening and lock therein to prevent rotation of accessory shoe 12 relative to the power track unless and until locking plate 46 is withdrawn longitudinally of core 40 away from the power track against the urging of spring 50.
A threaded collar 52 is provided on core 40 to engage locking plate 46 and prevent retraction thereof as desired. Threaded collar 52 may be knurled for a nonslip outer surface. Wires run through core 40 from contacts 44 to whatever accessory may be desired. A first type of accessory shown in FIGS. l-3 is a lamp and the core wires run directly to the bulb socket. In a second accessory shown in FIGS. 8-12 an outlet 60 is connected to contacts 44 by wires or conducting bars. In the case of a three wire outlet 62 shown in FIGS. 13-17 a third connection from an outlet contact 64 is provided through locking plate 46 and on outer member 16, both of which are conductors. The connection between the outlet contact 64 and locking plate 46 may be a wire 66 for flexibility. One tongue 24a of a modified end fitting 22a has a side conductor 68 which fits against outer member 16 and extends to a third screw terminal 25a for connection to the third wire of power cord 26a. This third conductor is usually a ground and it is therefore immaterial that exposed outer member 16 is included as a conducting portion.
Operation of Preferred Embodiments of the Invention Operation of the present invention is simple. Power track 10 may be placed on any surface, in any position, horizontal or vertical. It will be noted that there is no practical length limit of power track 10 and runs of 10 or 15 feet or more either in one piece or of several shorter lengths of track appropriately ductors 18 buried as much as possible for safety's sake.
plate 46 and enlargements 48 into locking engagement with the power track. Threaded collar 52 is tightened against locking plate-46 to secure the shoe to the power track.
Opening 16c should be made as small as possible and con- Any suitable accessory may be used with the invention. For
example, the great power carrying capacity of conductors 18 makes the use of electrical heater accessories feasible.
What I claim is:
1. An electric power supplying appliance comprising:
a. a power track adapted to be mounted on a surface, said power track being elongated and having a flat rear surface and a front surface defining a longitudinal opening;
b. a plurality of extended conductors in said power track, said conductors being insulated from said power track and being accessible through said elongated opening; and
c. an accessory shoe, said accessory shoe being adapted for mechanical securement to said power track and electrical connection to said conductors, said accessory shoe comprising:
i. a core member;
ii. an extension from said core member, said extension being adapted to fit into said opening and, upon rotation, electrically engage said conductors;
iii. a locking plate having a raised flange adapted upon rotation to engage said opening and lock said accessory shoe against further rotation;
iv. said locking collar being spring-urged toward said power track; and
v. a threaded locking collar for engaging said locking plate against movement away from said power track and thereby to prevent disengagement of said flange from said opening. 2. An electric power supplying appliance in accordance with claim 1, additionally comprising:
and end fitting for said power track, said end fitting being provided with tongue extensions'for sliding into grooves provided in said power track, said end fitting providing connecting means between said conductors and a power supply cord. 3. An electric power supplying appliance in accordance with claim 2, wherein: I
said connecting means comprises a spring contact adapted to engage one of said conductors and electrically extending to a terminal to which a power supply wire is connected and a second spring connector for engaging the other of said conductors and electrically extending to another terminal for connection to a second wire of a power supply. 4. An electric power supplying appliance in accordance with claim 3, wherein:
said power track is electrically conductive and is in electrical connection with a third wire of a power supply by means of a contact bar in sliding contact with said power track and connecting to a third terminal to which the third wire is fastened. 5. An electric power supplying appliance in accordance with claim 1, wherein:
said locking plate is electrically conductive and in electrical contact with said power track, said locking plate being electrically connected to a third accessory shoe conductor. 6. An electric power supplying appliance in accordance with claim 1, wherein:
said conductors are relatively flat bars disposed oppositely ofsaid opening in plane-parallel relation.