US1715287A

US1715287A - Electric heating element

Info

Publication number: US1715287A
Application number: US43478A
Authority: US
Inventors: Harold W Head
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-07-14
Filing date: 1925-07-14
Publication date: 1929-05-28
Anticipated expiration: 1946-05-28

Description

May 28, 1929.

H. w. HEAD 1,715,287

ELECTRIC HEATING ELEMENT Filed July 14, 1925 Patented May 218, 1929.

UNITED STATES PATENT OFFICE.

HAROLD W. HEAD, 0F ROYAL OAK, MICHIGAN.

ELECTRIC HEATING ELEMENT.

Application filed July 14,

An object of my invention is to provide an electrical heating element in which the resistance coil will not sag or in event ot' breakage will not cause a short circuit.

Another object of the invention is to suitably arrange a column of procelain insulators to permit flexibility and at the same time securely house the lheating element.

Another object seeks to provide a flexible heating'unit which may be easily Withdrawn -urthermore my construction permits easy assembling and disassenibling and ready replacement of broken or Worn parts.

A still further object is to provide means for holding the resistance element so that it is at no time enclosed thereby preventing a loss of heat and, at the same time, prolong the eventual burning out of the element.

lVith the preceding and other objects and advantages in'mind the invention consists in the novel combination of elements, constructions and arrangement of parts to be hereinafter enlarged upon, claimed and illustrated in the accompanying drawing, wherein:

Figure 1 is a longitudinal sectional viewpartly in section-of the heating unit.

Figure 2 is a horizontal sectional view on line\\2-2 of Fig. 1.

Fig. 3 is a similar horizontal sectional view online 3-3 of Fig. 1.

Fig. 4. is a perspective view of one of the insulating disks, and

Fig. 5 is a longitudinal sectional view of a standard Water heater showing a heating ele-` ment installed therein.

Similar parts are referred to by the same reference characters throughout the several views.

A cylindrical tube 6, preferably of copper,

A has a closed end 7 and an open end provided with a iange 8 adapted to rest on a shoulder 9 of an internally threaded socket 10 in a casting 11.

The ange 8 is held in Water-tight engagement with a shoulder 9 by means of a screw threaded ring 12 inserted in socket 10.

An extension 13 is provided on casting 11 by means of which it may be attached to any standard radiator or Water heater. The heating element designated in its entirety as 14 is inserted into the copper tube 6. The element comprises a number of porcelain disks 15 formed into a column and a resistance coil 16 inserted on the disks 15.

Terminals 17 of the coil 16 are connected to binding posts 18 attached to and insulated the resistance coil 16.

One of the insulating disks, preferably made of porcelain or other ceramic material, is shown in detail in Fig. #1. Around the Wall, periphery or circumference of each disk 15 are a number of equidistant recesses or cut away portions 21 opening at 22. The insulating ivalls 23 between adjacent recesses has a flat face or Wall 24: and a curved-in convex Wall 25.

In assembling the disks to form a column adjoining or adjacent disks are reversed as shown in Fig. 3. This novel method of staggering the recesses in the disks permits however a continuous aperture or slot through which the resistance coiled Wire is passed.

This construction prevents the coil 16 from being entirely enclosed as will be seen in Fig. 1.and permits the heat to more quickly dissipate.

At the top and bottom of the column of disks 15 is a porcelain disk 26 having a plurality of apertures 27 Which correspond in position with the slots 21. These apertures are connected on the face of the disk by an annular ring 28 as shown in Fig. 2.

Each disk 15 has Qn its top and base a lug 29 and recess 30 to lock in position and prevent rotation as is clearly shown.

Fig. 5 shows a common Water tank heating boiler or tank 31 provided with a cold-water inlet pipe 32 and a hot-Water outlet pipe 33 and the heating element which is surrounded by copper tube 6.

The reversing of the insulating disks 15 prevents the Wire from sagging whereby the Wire might touch Ythe copper tube 6. Should the Wire break it cannot touch the copper tube preventing a charged radiator which might cause a fire. In eect my construction makes a foolproof and safety device. f

Various types of end disks could be used. It should be clearly seen that no portion of the resistance coiled Wire is covered. On the contrary the Wire is quite exposed. On this feature l Wish to lay special stress.

Should the tank 31 shown in Fig. 5 be located in anl inaccessible place the object of making my column flexible Will be seen. The entire heating element is removed from the top of the tank and can be bent While being removed.

It must be understood that only a preferred embodiment of my invention is herein shown and described and that any departure from it, such as in shape, size or arrangement of parts, may be resorted to Without departing from the spirit or the scope of the subjoined claims.

Having thus described my invention, what I claim is:

1. An electrical heating element comprising an insulating body formed of a plurality of separable sections, means on each section to engage an adjacent section and prevent relative rotation of said sections and a plurality of resistance coils Within said body forming the sole connection between said sections to yieldingly connect said sections.

'2. An` electrical heating element'comprising an insulating body formed of a plurality of separate sections, means on each section to engage an adjacent section and prevent relative rotation of said sections, and laterally and longitudinally yieldable electrical resistance nieans passing longitudinally through said sections for holding said sections assembled.

3. An electrical heating element comprising an insulating body formed of a plurality of disks having a. plurality of peripheral longitudinal grooves, the grooves in one disk -body parallel with the axis of the body and forming the sole means for holding said disks assembled.

4. An electrical heating element compris ing an insulating body formed of a plurality of separate disks provided with a plurality of grooves extending inwardly from the peripheral surface ofthe disks, at an angle to planes radial of said disks, a series of resistance coils extendinglongitudinally of said body parallel with the axis thereof in said grooves and yieldingly connecting said disks and holding the same in longitudinal alignment.

5. An electrical heating element comprising an insulating body formed of a plurality ot' disks formed with peripheral longitudinal grooves and end disks formed with holes to align with the ends ot said grooves, and a series of resistance coils in said grooves and united at their ends through said holes in the end disks. said coils being under tension to yieldingly hold the several disks in assembled relation and in alignment, and means on said disks to prevent relative rotation thereof.

HAROLD lV. HEAD.