US1736198A - Electric circuit maker and breaker - Google Patents

Description

Nov. 19, 1929.

A. P. HOLDEN ET AL ELECTRIC CIRCUIT MAKER AND BREAKER Filed June 29.

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- lnventamt.

70W i iifi 2 Patented Nov. 19, 15929 UNITED STATES PATENT OFFICE ARTHUR P. HOLDEN AND PHILIP MORGAN, OF TORONTO, ONTARIO, CANADA ELECTRIC CIRCUIT MAKER AND BREAKER Application filed June 29,

The principal objects of the invention are, to eliminate the possibility of flooding oil in furnaces, in the event of the failure of the ignition, and to devise a verysimple and positive form of mechanism for automatically cutting out the control of the motive power.

The principal feature of the invention consists in the novel constructionof a casing pivotally mounted on the overflow pipe from the furnace in which a float mechanism is operatively connected with an electric cut out.

- In the drawings, Figure 1 is a perspective View of our automatic cut out device shown in the closed position of the switch.

Figure 2 is an enlarged longitudinal vertical mid-section through the device as shown in Figure 1. v

Figure 3 is a perspective view of the cut out shown in its tilted position for drain In the operatlon of 011 burnlng furnaces where the oil is fed by means of a power-operated pump, it is necessary to provide an automatic means of cutting out the amp in the event of the i ition failing and 1t is also necessary to provide means for emptying the oil from the apparatus, so that it may be refilled, and, it is further imperative that such apparatus cannot be left in an inoperable condition.-

In the construction herein shown the overflow pipe 1 which leads from the furnace is connected to a suitable pan or other receiver that will catch the oil from the burner nozzle if it is not being ignited.

The pipe 1 leads outside of the furnace and extends into a casing 2 the details of which form the subject matter of a se arate application Serial No. 397,048, file October 3, "1929, which is pivotally mounted upon a pin 3 extending through the pipe close to its outer end and through the lugs 4 in the sides of the casing. The said casing is formed with a substantially c lindrical wellportion 5.

The sides of t e lugs 4 form a lip 6 which fits around the underside ofthe pipe 1 and connelcts with the sloping spout-shaped portion A A cover 8 closes the top of the well 5 and 50 is provided with an upwardly flaring lip 9 to the position shown in Figure 3 w 1925. semi R'o. 40,340.

which registers with the side walls of the lugs 4 and allows the casing to be tipped upwardly en said lip engages the top of the pipe 1 and arrests the further movement.

Upon the cover '8 is arranged a pair of upwardly extending standards 10 between which by the lower end is pivoted a rocker arm 11.

The long end of the rocker arm extends to over an opening 12 arranged centrall above the well 5 and is pivotally connecte to the jaw-shaped stem 13 of the float 14. arranged within said well.

Between the upper ends of the standards 10 is pivotally mounted a artcylindrical casting 15 in which is secured a sealed tube 16 containing a quantity of mercury.

A pair of electrical contacts 17 are secured in one end ofthe sealed tube 16 and are connected to the wires 18 leading in from the motor control circuit.

- The mercury in the tube is adapted to form an electrical connection between the contacts when the tube is tilted in the position shown in Figures 1 and 2. f The tube holder 15 is provided with a fork lug 19 arranged centrally of the length thereof and a spur 20 extending upwardly from the rocker arm 11 engages said fork lug and when the float isin its lowermost position 1 said spur holds the tube tipped with the contact end down as shown particularly in Figure 2.

In the event of oil escaping from the furnace and flowing through the pipe 1, it flows into the well 5 and lifts the float. The lifting of the float tilts the rocker arm 11 on its pivot and causesthe mercury to flow to the opposite end, thereby breakin connection between the electrical contacts 1 As long as the float remains raised it will be impossible for the. motor to be again started.

A stop lug 21 is arrangedgon the arm 11 to limit the movement of the switch tube.

A sprin plunger 22 is arranged in the cover '23 c osing' 1n the electrical so that if it is desired to break the circult to the motor at any time, it may be done by. pressing down upon the plunger.

When the device has operated automatically to cut off the electrical circuit, it is necessary to drain the oil from the well and this I is accomplished by the very simple act of tiltingthe casing 2 upon its pivot allowing the oil to flow therefrom out of the spout 7.

The lip'9 prevents the casing from being tipped past the centre of gravity so that if it is released, it will dro back of its own weight to its normal position and the weight of the float, being unsupported by oil in the well, operates the rocker arm to throw the switch into the position shown in Figures 1 and 2, when it is ready to again operate.

It will be seen that if oil has been allowed to flow to the safety switch herein described the motor cannot be turned on and run without cleaning out the well and in emptying the well it cannot be left in an inoperativ position.'

What we claim as our invention is 1. In an electric circuit maker and breaker, the combination with a rigid overflow pipe, of a casing ada ted to receive the discharge from said over ow pipe, a float in said casing, a cover closing the casing and havin a rigid support extending thereabove at one side of said casing, an arm pivotally mounted on said support and having one end extending. over said float and pivotally connected therewith and having a stop extension at the other end adapted to engage said cover to limit the movement of the arm, and a tilting mercury tube switch pivotally mounted at the upper end of said rigid support with its axis spaced above the axis of the arm and being operativel connected with said arm.

2. In an electric circuit maker and breaker, the combination with a rigid overflow pipe, of a casing ada ted to receive the discharge from said ove ow pi e, a float in said casing, a cover closing t e casing and having a rigid support extending thereabove at one side of said casing, an arm ivotally mounted on said, support and extending over said float and pivotally connected therewith, a projection on said arm above its ivotal mounting, and a mercury tube mounted on a pivot s aced directly above the pivotal mounting 0 said arm and having a notched entension operatively engaged from below by the projection on said arm.

3. In an electric circuit maker and breaker, the combination with a "rigid overflow pipe, of a casing ada ted to receive the discharge from said-ove ow pi e, a float in said casmg a cover closing t e casing and having a r1g1d support extending thereabove at one side of said casing, an arm pivotally mounted on said sup rt' and having one end extendmg over said float and pivotally connected therewith, and having a stop extension at the othenend adapted to engage said cover to hmit the movement of the arm, a tilting mercury tube switch pivotally mounted at the

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