US2368488A - Electric heating system - Google Patents

Description

W. F. OGDEN ELECTRIC HEATING SYSTEM Jan. 30,, 1945.:

Filed March 17, 1944 T-igJ.

from a suitable source of electrical supply 22b and its energization is controlled by means of a switch 23. The water heater may also be provided with a secondary heating element 220 located at the top of the tank, this heater generally being controlled to be energized quickly to supply hot water in the event the hot water in the tank has been substantially depleted. This heating element also has a high capacity. This heating element 22c also may be energized from the source 2217, but in the specific example of the invention illustrated it is not controlled by the switch 23. It will be understood, however, that it may be controlled by the switch 23 so that when this switch is in its 011" position the entire heater is deenergized; on the other hand, the switch 23 may be used to control the upper heater 22c alone.

As pointed out previously, it is an object of this invention to limit the maximum load that can be imposed upon the common supply system provided for the range and water heater. In the specific example illustrated, the water heater may be connected to the supply source when the switches I5, I! and l8 for the heaters ll, 13 and I4 are in their off or in any of their heat controlling positions, and also may be energized when the switch l6 for the large surface unit I2 is in the two lower heat positions, or in the "ofl position, but cannot be energized if this switch is in its three higher switch positions all assuming that the oven is dcenergized completely. It is contemplated that when the oven switch 20 is moved from its oil position to any of its heat controlling positions then the water heater will be cut oil from the supply circuit.

In order to accomplish the foregoing, I mechanically interconnect the switch ii for the high capacity surface unit 12, and the switch 20 for the oven with the water heater switch 23. I accomplish this by means of a rigid slide bar 25 which is mounted back of the range front plate 25, as shown in Fig. 1. This slide bar is arranged to control the operation of the water heater switch 23. This switch, as shown, has a fixed contact 21 with which a movable contact 2| cooperates so that when the two contacts are in engagement the heating element 22 is energized, whereas when they are open the element is deenergized. The slide bar 25 carries an insulating block 29 which is arranged to engage the switch arm 28 to close it when the slide bar is moved toward the right, as viewed in the drawing, whereas when the slide bar is moved toward the left, the switch bar 28 opens by reason of its inherent resiliency. The slide bar is biased toward the right to close the switch 23 by means of a spring 30 coacting with its leftand end, as viewed in Figs. 1 and 3.

The switch knob lBa for the high capacity surface unit I2 operates a cam 3| mounted on the switch shaft lib, andwhich is positioned within an aperture 32 provided for it in the bar 25, and the switch knob 20a of the switch 20 operates a cam 33 mounted on the switch shaft 20b, and which operates within an opening 34 provided in the bar 25. The cams are arranged to operate against the edges 35 and 36 of the two openings 32 and 34, respectively. The shape of the cam 3| is such that whenever the knob IE0 is moved to its three positions corresponding to the three higher heats for the unit I2 it will hold the bar 25 toward the left against the force of the spring 30, as shown in Fig. 4, in order to keep the switch 23 in its open position,

and thereby prevent undesirable energization of the water heater. The cam 33 of the oven switch 20 is so arranged that it will hold th bar 25 toward the left to prevent energization of the water heater in any of its heat controlling positions; in other words, whenever the knob 20a is turned from its off position to an oven heat position, the water heater will be deenergized.

The slide bar 25 is further provided with slots 3'1, 38 and 39 having the same shape as the slots 32 and 34, but which perform no function in. controlling the water heater. In other words. these openings are provided merely to accommodate the associated switch shafts [5b, Ill) and 18b for the heaters ll, I3 and It, respectively. However, if it be desired to further limit.the connected load, these three shafts may be provided with cams suitably shaped to disconnect the water heater for the higher heat positions of the associated heaters.

The switch bar 25 may be mounted to slide in any suitable guideways or tracks, but as shown it is mounted to slide upon suitable fixed brackets 40 and 4] which have forwardly projecting retaining members 42 and 43, respectively.

As will be understood by those skilled in the art, the water heater switch 23 may control the heater 22 through a suitable relay, if it is desired to use a switch 23 of smaller capacity.

While I have shown a particular embodiment of my invention, it will be understood, of course, that I do not wish to be limited thereto since many modifications may be made, and I, therefore, contemplate by the appended claims to cover any such modification as fall within the true spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. A system of control for a plurality of electrical devices constituting primary and secondary loads, said primary load having a plurality of separate multiple heat heating means of different capacity, and said secondary load having a heating element, said system comprising separate multiple position switches for controlling said separate primary load heating means respectively to generate different degrees of heat in each, a switch for controlling said heating element oi said secondary load, and interlocking means between said multiple position switches and said secondary load switch constructed and arranged so that the latter switch is operated to energize said secondary load heating element when all of said multiple position switches are in their "01? positions, and is operated to deenergize said secondary load heating element when any one of the multiple position switches of the higher capacity heating means is in any one of its positions which cause its associated heating means to generate its higher degree of heat, and further is reoperated to reenergize said secondary load heating element when said one switch is operated to cause its said associated heating means to generate its lower degrees of heat.

2. A system of control for an electric range and an electric water heater, said range having at least two multiple heat heating means, one of which consumes a relatively great amount of energy in all of its heat conditions, and the other of which consumes a relatively great amount of energy in certain ones only of its higher heat conditions, separate multiple position switches controlling said heatin means respectively, each when operated from its "off" position controlling.

aaeaass its heating means to generate a degree of heat depending upon the position of the switch, said water heater having a heating element and a switch for controlling said heating element, an

' interlocking means between said switches so that switch is moved from its "01? position to any of its positions for causing the associated heating mean to generate said higher heat conditions, said water heater switch is likewise operated to deenergize the water heater, but when said other switch is moved to positions corresponding to the lower heat conditions of its associated heating means, said water heater switch is closed to energize said water heater heating element, all

providing said switch for said one heating element is in its oi'f" position.

3. A system of control for an electric range and an electric water heater, said range having a multiple heat surface unit, and an oven provided with relatively high heat capacity, heating means therein, and said water heater having heating means, said system comprising a multiple position switch for controlling said surface unit to generate diflerent degrees of heat by the movement of said switch from its "off" position to its diiferent heat "on" controlling positions, a switch controlling said oven heating means operating to energize said heating means when operated from its "off position to. heat "on"'positions, a switch for controlling said water heater heating means so that when it is moved from its ofi" to an on" position it energizes said heating means, and interlocking means between said switches constructed and'arranged so that when said surface unit switch is in certain of its positions for effecting the higher degrees of heat in said surface unit said water heater switch is opened, and when it is in-its lower heat positions said water heater switch is closed, all provided said oven switch is in its off" position, and further so that whenever said oven switch is operated from its oiT position to its heat on" positions said water heater switch is opened.

4. .A system of control for an electric range and an electric water heater, said range having a multiple heat surface unit, and an oven provided with relatively high heat capacity heatin means therein, and said water heater having heating means, said system comprising a multiple position switch for controlling said surface unit to generate different degrees of heat by the movement of said switch from its "on" position to its different heat on controlling positions, a switch controlling said oven heating means operating to energize said heating means when operated from its "0 to heat "on positions, a switch for controlling said water heater heating means so that when it is moved from its "oi!" to an on" position it energizes said heating means, a slide bar for operating said water heating switch operable when moved in onedirection to close said switch and when moved in the other direction to open said switch, means biasing said bar in said one direction, and cam means operated by said surface unit and oven switches controlling the motion of said bar so that whenever said oven switch is moved from its "off" position said bar is moved against the pressure of said spring to open said water heater switch, and when said oven switch is in its "off position and said surface unit switch is in any of its positions corresponding to the lower degree of heat said spring forces said bar to close said water heater switch, but when said multiple position surface unit switch is in its, positions for eifeeting the higher degrees of heat in said surface unit, said bar is moved against the force of said spring to even said water heater switcn' WILLIAM F. OGDEN.

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