US1408183A - Electric heater for outdoor use - Google Patents

Description

E. A. EVERETT. ELECTRIC HEATER FOR OUTDOOR USE.

APPLICATION HLED MAR. 13. 1919.

Patented Feb. 28, 1922.

UNITED STATES PATENT OFFICE.

EDWARD A. EVERETT, OF NEW YORK, N. Y., ASSIGNOR TO Q dc C COMPANY, OF NEW YORK, N. Y., A CORPORATION OF MAINE.

ELECTRIC HEATER FOR OUTDOOR USE.

Application filed March 13, 1919.

To all whom it may concern:

Be it known that I, Enwann A. Evnnn'r'r, a citizen of the United States, and resident or" New York, in the county of New York and State of New York, have invented cer tain new and useful Improvements in Electric Heaters for Outdoor Use, of which the ,t'ollowing is a specification.

This invention relates to electric heaters and has for an object providing a heater suitable for out-door service that is rugged, that can stand excessive vibration and knocks such as would be encountered on a railroad track and that is effective when immersed in water. In the accompanying drawings forming part of this specification, Fig. 1, shows a heater unit complete, Fig. 2, is a sectional elevation with )art of the coil, however, shown complete, *ig. 8 is a crosssection on line o-b of Fig. 2; Fig. at is a section of the safety valve and Figs. 5 and 6 show the application of the heater units to a railroad switch.

11 represents a length of wrought iron pipe to which the reducing caps 12 and 13 are screwed. Into the cap 12 the pipe l l is screwed and into the cap 13 the pipe 15 carrying the valve 16 is screwed, however this valve may be screwed directly into cap 13. Pipe 29 is screwed into cap 12 and extends within pipe 11 between caps 12 and 13. This pipe is covered with a layer of asbestos cloth 28, Fig. 3 which is a non conductor of heat and also forms a cushion to take up small vibrations from the outer covering and heating coil. The outer covering 27 consists of a cement applied in a plastic form and which tends to harden under heat. The heating coil consists of a spiral of high resistance wire 23 such as is commonly used in electric heaters. This coil is partially embedded in the cement 27 which holds it in place. Two straps 26 are provided for clamping the asbestos cloth to pipe 29 and terminals 24.- and 25 may be secured to these straps for terminating the ends of the heating coil as shown in Fig. 2.

The conductors 21 and 22 are connected with a source of electric supply. These are led into the heating coil through the pipe let where they connect to asbestos covered wires leading to the terminals 24: and 25. In pipe 29 and in that portion of pipe 14 Specification of Letters Patent.

Patented Feb. 28, 1922.

Serial No. 282,423.

subject to heat a filling 31 of mineral wool is provided surrounding the conductors which holds them in place and absorbs vibration. Adjoining the mineral wool, a section of pipe 14: is filled with sealing war; as at 32, F 2, this forms a long waterproof seal for the outlet of the conductors. The outer end of the pipe 14 is filled with a cement 33 which hardens and forms a mechanical protection to the other fillings. The pipe 14 forms a convenient handle by which the units may be carried even when they are heated.

l/Vhen the chamber enclosed by pipe 11 is heated, the air and other gases in it are heated and expand, to permit these gases to escape the safety valve 16 is provided. This consists of a plunger with a valve seat 42, Fig. 4, held closed by the spring 41. When the pressure under the valve overcomes the spring the gases escape through the filter 43; this filter is provided to pre vent dust from getting to the valve mechanism.

One use to which this invention is particularly adapted is for thawing switches on a railroad track. For this purpose the units are placed below the rails 17 and 18 as shown in Figs. 5 and 6. In this position, vibration is excessive and the outer shell must be able to resist blows from falling objects on passing trains. This construction is strong, comparatively light and the walls of the shell are thin to radiate the heat. The radiating surface is so designed with relation to the heating capacity that while it will melt snow and ice, it will not boil water.

Having thus described my invention, I claim:

1. In an electric heater of the class described, in combination, a length of iron pipe of large diameter, reducing caps screwed to each end of said pipe, a length of pipe of small diameter screwed to one of said caps, a heating coil enclosed within said large diameter pipe, conductors to said heating coil inserted within said small diameter pipe, and said latter pipe being filled with mineral wool where it is subject to heat. with a WZLtBDPIOOf sealing compound adjacent to said mineral wool and with cement at the outer end.

2. In an electric heater of the class described, in combination, a length of pipe of ing coil led out through said exterior length large diameter, reducing caps screwed to of pipe.

each end of said pipe, an exterior length Signed at New York in the county of of pipe of small diameter screwed to one New York and State of New York this 5 of said caps, an interior length of pipe of third day of March A. D. 1919.

small diameter extending between said caps a covering of asbestos cloth for said eXtBllOl EDWARD A. EVERETT.

ipe, a covering of cement over said asbestos Witnesses: cloth, a heating coil partially embedded i; SUE SEGAL, 10 said cement, and conductors for said heat- SYLVIA HAHN.

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