US730069A - Electric lamp. - Google Patents

Description

No. 730,069, PA'TENTED JUNBZ, 1903. A. J. WURTS,

ELEGTRIC LAMP.

APPLICATION FILED SEPT. 28, 1901.

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PATENTED JUNE 2, 1903.

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ELECTRIC LAMP.

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THE Noams PETERS no. woToumQ. WASHVNGTON, 0v 0- UNITED STATES Patented June 2, 1903.

PATENT OFFICE.

ALEXANDER JAY WURTS, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO GEORGE XVESTINGl-IOUSE, OF PITTSBURG, PENNSYLVANIA.

ELECTRIC LAM P.

SPECIFICATION forming part of Letters Patent No. 730,0 69, dated June 2, 1903. Application filed September 28, 1901. Serial No. 76,970. (No model.)

To all whom it may concern:

Be it known that LALEXANDEE J AY WURTS, a citizen of the United States, residing in Pitts burg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Electric Lamps, of which the following is a specification.

My invention relates to electric lamps of the type in which the light-emitting member or element is a non-conductor under ordinary temperatures, but becomes a conductor when heated to a relatively high'temperature.

The object of my invention is to provide an automatic cut-out for the heater that is employed to raise the light-giving member to conducting temperature which shall be noiseless and certain in operation and adapted for use in connection with alternating currents irrespective of the rate of alternations.

With these ends in viewI have devised the means shown in the accompanying drawings, in Whl0l1 Figure 1 is a view, partially in side elevation and partially in section, of a lamp construeted in accordance with my invention.

Fig. 2 is a plan view of a portion of the mechanism shown in Fig. 1. Fig. 3 is acombined sectional and diagrammatic view of the operating parts of the lamp. Figs. 4 and 5 are views of aportion of the cut-out armature, taken at right angles to each other and partially in section and partially in elevation. Figs. 6 and 7 are respectively a front elevation and a horizontal section of cut-out contacts of modified construction. Figs. 8 and 9 are views corresponding to Figs. 6 and 7 and illustrating a slight modification. Figs. 10 and 11 are also views similar to Figs. 6 and 7, but showing a slight further modification.

Referring now to the details of construction illustrated in the drawings, the lamp 1 is shown as comprising a frame 2 for supportingthe operative parts, a housing 3, and a globe 4, depending from the housing. None of these parts, however, pertain to my inven tion, except in so far as they constitute parts of a complete lamp.

The base-plate 5, of suitable material, on which are mounted the binding-posts 6 and 7, is provided with suitable means (not shown) for detachably supporting the glowers, the latter being alsoshown only diagrammatically in Fig. 3. Supported above the plate 5 by means of a suitable block or standard 8 is a second plate or disk 9, having hollows or recesses 10 in its upper surface, one for each ballast resistance, the lower ends of the glass bulbs or tubes 11, in which the ballastwires are located, being seated in these holes or recesses 10. v

Projecting upward from the center of the plate 9 is a post 12, the upper end of which may project through the top of the housing and have screwed onto it a nut 13, having an eye 14: to be used for suspending the lamp and serving to clamp the parts of the housing in position. Securely fastened to the rod or post 12 is a metal piece 15, (see Figs. 1 and 2,) having a plurality of arms 16, one for each ballast-tube 11, the outer ends being perforated, so as to receive the pointed ends of the ballast-tubes, and since this plate is so disposed that the arms will be sprung into position they will hold the ballast-tubes securely in place. If desired, a small disk of asbestos 17 may be interposed between each arm and the top of the ballast-tube, so as to avoid any danger of noise or the breaking of tubes.

The plate 15 is also shown as provided with two arms 18, '(see Fig. 2,) the outer ends of which have holes through which project the insulating bushings 19, that surround the conductors 20, leading from the source of current to the operating parts of the lamp.

' The cut-out, which is also mounted upon the plate 9, comprises an actuating-coil 21, (reference being now had to Figs. 1 to 5, inclusive,) on the top of which is clamped a nonconducting-bar 22, having slots adjacent to 0 its ends, in which are supported bearing pins or trunnions 23". These bearing pins or trunnions are fastened in position by bodies 23 of cement, and from them are loosely suspended two iron or steel arms 23, that serve 5 as armatures for the magnet-coil 21. These arms are of angular form, as indicated, so that their lower ends will normally swing outward under the action of gravity. The lower end of the coil is also provided with a mo pole-piece 24, the ends of which project upward and outward from the bottom of the coil. Adjacent to the pole-pieces 24: are the stationary contact members of the cut-out, each of which has two substantially vertical pins 26, of silver or other suitable metal, in position to be engaged by a horizontal bar 27, mounted in the lower end of the arm 23. This bar 27 projects through a hole 28 in the end of the arm 23, thatis of materially greater diameter than the bar, and the latter is loosely supported upon a Vertical pin 30, that projects into the enlarged central portion 29 of the hole 28. By reason of this construction and arrangement of parts the bar is free to turn laterally on the pin and may also rock vertically to a greater or less degree.

Since each of the arms 23 is loosely suspended from its upper end, it does not necessarily move in exactly the same path each time that it is actuated; but notwithstanding this possible irregularity of movement the means for supporting the bar 27 is such that it will invariably make good contact with both of the corresponding pins 26 whenever the magnet is denergized.

In Figs. 6 and 7 the construction is the same as that already described, except that the lower end of the armature 23 is recessed at 31,.and the bar 2'7 is bent around this recessed portion, so as to be loosely supported upon the head 32 and be thus free to turn in any direction, so as to always make engagement with the pins 26. v

In Figs. 8 and 9 the construction is the same as that shown in Figs. 6 and 7, except that the bar 27 is bent completely around the recessed portion 31, so as to make a loop or eye. The operation is, however, substantially the same as that already described.

In Figs. 10 and 11 the armature-arm 23 is recessed in the same manner as is illustrated in Figs. 6 to 9; but in this case a loose band or ferrule 33 surrounds the recessed portion 31. This loose band or ferrule is therefore free to turn on the recessed part, and it makes engagement directly with the stationary contact-terminals 26 which in this instance are bent laterally, so as to form a V-shaped space, into which the lower end of the arm 23 moves when the magnet is deenergized. With this arrangement the ferrule or band is obviously free to turn or roll, so that it will readily move into engagement with both contacts without material friction by reason of the rolling action.

It will be understood that my invention is not limited to cut-outs in which the armature bridges two circuit-terminals, since the utilization of the armature as one of the ciredit-terminals is obviously feasible and within the scope of the invention.

Other variations as regards form of parts may obviously be made without departing from my invention, and I therefore desire it to be understood that the invention is not limited to the details of construction shown, except in so far as limitations may be imposed by the state of the art.

I claim as my invention- 1. A cut-out for electric-lamp heaters comprisinga substantially vertical magnet, a nonconducting, slotted bar supported thereby and a circuit making and breaking armature loosely suspended from said slotted bar and provided at its lower end with a contact-piece having a universaljoint connection therewith.

2. A cut-out for electric-lamp heaters comprising a substantially vertical magnet, a nonconducting, slotted bar supported thereon, trunnions supported by said bar and circuit making and breaking armatures loosely suspended from said trunnions and provided at their lower ends with loosely-supported contact-pieces.

3. A cut-out for electric-lamp heaters comprising a substantially vertical magnet,a slotted bar supported thereon, trunnions supported in recesses in said bar and cemented therein and circuit making and breaking armatures loosely suspended from said trunnions and provided at their lower ends with loosely-supported contact-pieces.

4. A cut-out for electric-lamp heaters comprisingasubstantially vertical magnet, aslotted bar supported thereon, a supporting-plate for the magnet having heater-circuit terminals, armatures loosely suspended from the slotted bar and circuit making and breaking pieces loosely supported upon the lower ends of said armatures in position to engage said heater-circuit terminals.

5. A cut-out for electric-lamp heaters comprising a magnet, a slotted bar supported thereon, stationary contact-terminals, an angular armature loosely suspended from said slotted bar and a contact device loosely supported by said armature in position to engagesaid contact-terminals when the magnet is denergized and held free from all mechanical contact when the magnet is energized.

In testimony whereof I have hereunto subscribed my name this 20th day of September, 1901.

ALEXANDER JAY l/VURTS.

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