US2018293A - Electrical heating system - Google Patents

Description

Oct. 22, 1935. s, A. wlLLlAMs E1' AL 2,018,293

ELECTRICAL HEATING SYSTEM med Feb. 1a, 1931 2 sheets-sheet 1 as wbf" E? ///)K////7////////// JNEP 63' le Hwa/ran.- @f @y W Oct. 22, 1935 s. A. WILLIAMS Er AL ELECTRICAL HEATING' SYSTEM Filed Feb. 18, 1931 2 Sheets-Sheet 2 l? nga.

Lax

fg z

---11-11,--III'I'II'II'I'I UNITED STATES PATENT OFFICE ELECTRICAL HEATING SYSTEM Stanley Austen Williams, Osterley Park, and Joseph Leslie Musgrave, London, England Application February 18, 1931, Serial No. 516,770 In Great Britain March 28, 1930 1 Claim.

This invention relates to the heating of buildings by an electrically generated heat radiating from the walls, iioors, ceilings or other suitable structural part of a room or building, and refers to that system in which the conductor wires are threaded through beads or short tubes of glass, porcelain or other insulating material. and then enclosed in metallic or other tubes before being disposed in or incorporated with the walls or floors of the room or building, the length of such metallic tubes depending on the surface area of the structure from which the heat radiates.

Hitherto in this system of electrical heating a continuous length of insulated conductor wire has been employed, such wire being passed through the rst metallic tube at the one end, out at the opposite end then through the corresponding end of the next metallic tube, and so on through each adjacent tube for the entire length of that surface of the material in which they are embedded from which the heat radiates. Also in order to allow for inspection of the tubes at either end an opening or openings has been formed, in the material in which said tubes are embedded, at either side of the heat radiating surface.

Now according to one construction of this invention we form the metallic tubes U shape and in each tube we enclose a single length of the insulated wire. The ends of the U tube project into what we term a header box or chamber running the full length of the panel or part from the surface of which the heat radiates, and the ends of the wires which project through the U tube are secured to connecting terminals provided in said header box or chambers.

In another construction according to this invention we thread the conductor Wire through insulating beads or equivalent in which two holes or bores are formed, the one end of the single length of wire is threaded through the one hole in the beads and the other end through the other hole, thus forming in said conductor wire, midway of its length a hairpin bend. The insulated wire is then enclosed in a metallic tube of the requisite length, preferably closed at one end, the ends of the wire projecting through the other end of said tube, which end of said metallic tube fits into the header box or chamber, the projecting ends of said wire being secured to the connecting terminals in such header box.

In order 4that the invention may be clearly understood we have appended the accompanying drawings.

Fig. 1 is a broken part sectional plan view showing our system when using a single length of insulated conductor wire enclosed in a U shape metallic or other tube.

Fig. 2 is a broken part sectional plan view showing arrangement with curved U shaped tubes.

Fig. 3 is a part sectional broken side view shcw- 5 ing a single length of wire threaded through two hole insulators and then enclosed in a tube, preferably closed at the end where the hairpin bend in the wire occurs.

Fig. 4 is a broken plan view of Fig. 3. i0

Fig. 5 is an enlarged part sectional view showing a portion of the conductor Wire threaded through two hole insulator beads enclosed in a metallic tube and Fig. 6 is an end view of Fig. 5.

Fig. l is a longitudinal section of one of the in- 15 sulating beads.

A represents the conductor wires, a1 the insulating beads, B the metallic tubes in which the insulated conductors are enclosed, D the header box or chamber into which the ends of the tubes 20 B lit b1 the terminals to which the ends of the conductors A are connected, and E the material in which the tubes B are embedded and from the surface of which the heat radiates.

Referring to Fig. 1 the insulating beads a1 are 25 first threaded on to a single length of conductor wire, one end of the insulated wire being then inserted into the one leg of the U shape tube B,

l passing around the U bend and out at the end of the other leg, and as each leg of the tube B is 30 fixed in an opening in the side of the header box D, the loose ends a2 of said wire A project into such header box, each loose end being then secured to its respective connecting terminal b1 provided for the purpose. Where circumstances ne- 3 cessitate the use of curved tubes B, we may iix the curved ends of the legs of the U into a circular header box D in the manner shown by Fig. 2. T'he tubes B together with the header box are incorporated with or disposed in the material E forming the walls or floor or ceiling from the surface of which the heat radiates. As shown in Fig. 2 the header box D is provided with tube terminal engaging portions X and Y in pairs, one element s of one pair being on the outside of the header box D and the other element of 'said pair being within the header box, and the tube engaging portions X being a support for the adjacent ends of the inner legs of each of the tubes B as shown. 5o At Figs. 3 and 4 we have illustrated another construction of our invention. In this case instead of separating each bend of the insulated conductor wire by passing one end up the one leg QI a U shape tube and then down the other l5 leg of such tube, we form two holes or bores in the insulating4 medium, such insulating medium consisting preferably of short lengths a1 of glass or porcelain tubing. 'Ihe one end of the single length of conductor wire A is threaded through the one hole in the tubes a1, and the other end through the other hole, thus forming in said wire A, midway of its length a hairpin bend a3, as clearly shown by Figs. 5 and 6. The insulated wire A is then inserted into the metallic tube B fixed in the header box D, the loose ends a2 of the wire, which project through the tube into said header box', being secured to the connecting terminals b1. The ends a* of the tubes B are preferably closed as shown.

It will be evident that each bend of the single length of conductor wire A could be threaded on to separate insulating beads or short lengths of tubing instead of on to short lengths of tubing in which two holes or bores are formed, and then inserted into a. straight length of metallic tube, the loose ends of the wire projecting through the tube into the header box.

By constructing electrical heating systems in the manner herein set forth and shown, should trouble arise in connection with any of the conductors A, easy access by way of the header box can be obtained, and such faulty conductor and the insulator covering readily Withdrawn from its tube B by Way of the header box and either in pairs one without and the other within the box and carried by the wall thereof, said pairs of tube terminal engaging portions being circumferentially spaced from one another, and at least certain ones of said pair of tube terminal engaging portions providing a support for adjacent legs of adjacent tubes, a plurality of insulating elements loosely fitting within each of said tubes and substantially filling the same from end to end thereof, each of said insulating elements being slidable in said tubes and having a bore V extending therethrough, and a conductor wire for each of said tubes extending through the bores of each of said insulating elements, electric terminals within said header box and adjacent said tube terminals, and the ends of said wires projecting into said header box from the ends of the respective tubes and secured to said terminals.

STANLEY AUSTEN WILLIAMS. JOSEPH LESLIE MUSGRAVE.

Images