US1208188A - Post-type arc-lamp. - Google Patents

Description

F. H. MILLER. POST TYPE ARC LAMP.

APPLICATION FILED NOV. 28, ISIS.

mwmwu Patented Dec. 12, 1916.

INVENTOR ATTORNEY FREDERICK I-I. MILLER, 0F WILKINSBURG, PENNSYLVANIA, ASSIGNO R TO WESTING- HOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

Specification of Letters Patent.

ros'r-rYrE ARC-LAMP.

Patented Dec. 12, 19116.

To all whom it may concern Be it known that I, FREDERICK H. MIL- mm, a citizen ofthe United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Post-Type Arc-Lamps, of which the following is a specification.

My invention relates to are lamps, and it has particular reference to are lamps of the inclosed type which are to be mounted upon posts or pedestals.

Heretofore, it has been diflicult to design an inclosed arc lamp for post mounting which would be simple in construction and would permit of expeditiously making 1nspections and, at the same time, preclude the inflow of water to the lamps structure when subjected to severe weather conditions.

One object of my invention is to provide an inclosed arc lamp for post mounting which will be weather-proof, and, in addition thereto, will be simple and inexpensive to construct.

Another object of my invention is to provide a lamp of the character indicated above which will permit the necessary inspections and periodical replacements to be made without undue annoyance or loss of time to the inspector.

For a better understanding of the nature and the scope of my invention, reference may be had to the following description and the accompanyingdrawing wherein is disclosed one embodiment of my'invention.

In the drawing, Figure 1 is a view, partially in section and partially in elevation, of an arc lamp constructed in accordance with my invention; Fig. 2 is a side view of an outer globe for my arc lamp; Fig. 3 is a View, taken on the line III-III of Fig. 1; Fig. 4: is a cross-sectional view of a device utilized in my invention; Fig. 5 is a View, taken on the line VV of Fig. 1; Fig. 6 is a view, that is taken on the line VIVI of Fig. 1 and shows a clamping means for the outer globe of my lamp, and Fig. 7 is a view, taken on the line VIIVII of Fig. 1 and showing a hinge device associated with the outer globe shown in Fig. 1.

Referring to Fig. 1, a pair of cooperating electrodes or carbons 1 and 2 are disposed in an arc chamber 3 provided by an inner globe 4 which is closed at its bottom and communicates at its top with the chamber of a condenser 5. The feeding and regulating mechanisms (not shown) of the lamp are of any usual form of construction and are inclosed in the structure 6 which is designed to preclude the admission of water into the chamber of said structure and to permit adequate Ventilation thereof. A divided outer globe 7 substantially surrounds the inner globe 4: and provides a dead air space 8 which maintains the walls of the inner globe 4 uniformly hot during the existence of the are: It is essential that the dead air space 8 be cut off from communication with the chamber of the condenser 5 by an imperforate annular member 9 and also it is essential, for the most satisfactory operation of the lamp, that the said air space be closed against the circulation therethrough of atmospheric air. As shown in the drawing, the lamp structure is supported upon a post or pedestal 10 by means of oppositely disposed and upwardly projecting arms 11 which are cast in the upper portion of the post 10, and are firmly secured to the supporting annulus 9 of the lamp.

Inasmuch as it is necessary to remove the inner globe 4i when trimming or replacing the burned carbons, and because the lamp cannot be readily disengaged from the sup porting arms 11, I provide a means for access to the inner globe 4 by employing a di vided outer globe 7. As shown in Figs. 1 and 2, the outer globe 7 is divided into halves, each of which is attached to a hinge 12 secured to one of the arms 11. A clamp device 13 is disposed opposite said hinge and normally maintains the cooperatively engaging edges of the halves of the globe 7 in close contact with,each other.

In order to trim the lamp, a latch 14 of the clamp 13 is released from a recessed arm 15, thereby permitting the globe halves to be swung apart. Each half of said globe is swung upon the hinge 12, thus making the globe 4 accessible. When the inner globe is detached from the lamp structure, its lower portion projects into a recess 16 formed in the upper portion of the post 10. In this manner, the inner globe 4 is insured against injury and room is provided whereby the electrodes 1 and 2 may be conveniently' removed and new electrodes inserted.

The divided globe 7 may be formed by cutting. a globe of ausual shape along a plane through its vertical axis. Upon the cut edges of each half of the globe 7 are spun or fitted metallic channeled rims 17 to .which are rivited the cooperating members of the clamp 13, substantially as shown in Fig. 6. Referring to the hinge 12, illustrated in Figs. 2 and 7 a support 18 thereof is riveted to the arm 11, the said support being provided with an opening through which a pin 19 loosely projects. Embracing each end of the pin 19 are two members 20 which encircle the shank of the said pin and are riveted to the metallic rims 17 embracing the cut edges of the globe halves. I

The object of placing the metal rims l7 uponthe cooperatively engaged edges of the globe halves is three fold, namely, to provide a supporting means for the clamp 13 andthe hinge 12, as mentioned above; to preclude the chipping of the glass by reinforcing the cut edges, and. to provide a water-tight joint between the respective globe edges and lips ofthe arms 11.

As illustrated in Figs. 3, 4 and 5, the arms 11 are provided with integrally formed lips .21 'which are normally spaced apart as shown in F igL 4 by reason of the spring action imparted thereto by the slit tubular arm 11. When the halves of the globe 7 are clamped together, the metallic rim 17 upon each globe half engages its respective lip 21, thereby forcing the-lips into engagement, as shown in Fig. 3. This form of construction provides a water-tight joint between the globe halves which precludes the flowing of water into the chamber 8 and the chamber 16 located in the upper portion of the post 10.

It is apparent that a rain shield such as 22 will prevent water from entering the chamber 8 at the upper edges of the halves of the globe 7. The lower edges of the globe halves encircle an upwardly projecting ridge 23. The joints formed by pressing the metallic rims 17 firmly against the lips 21, as described above, are sufiiciently tight to shed Water. Another advantage of my lamp structure is the employment of the arms 11 for both supporting the weight of the lamp proper and for enhancing the effectiveness of the joints between the globe halves by reason of the spring action imparted thereby to the lips 21. Although a portion of light flux from the arc is intercepted by the arms 11, they are not of sufficlent diameter to cast undesirable and dis agreeable shadows.

Byreason of my invention, I may also employ acondenser having walls that extend laterally beyond the globe 7, which type of condenser is preferred because of its high heat-radiating capacity. No inconvenience will result in the use of a condenser such as shown, inasmuch as the outer globe 7 is positioned to surround the inner globe 4 without having to pass the outer globe over the condenser, as is necessary in lamps of this type heretofore constructed.

While I have herein shown and described one embodiment of my invention, it will be understood by anyone skilled in the art that various modifications may be efiected without departing from the scope of the appended claims.

I claim as my invention:

1. The combination with a pedestal, and arms projecting therefrom, of an arc lamp supported on said arms, an inner globe attached to said are lamp, and a divided outer globe disposed upon the pedestal and providing a dead air space which substantially surrounds the said inner globe, the sections comprising the divided outer globe closely engaging said arms which serve to provide tight joints between the respective globe sections. 7

2. The combination with a pedestal, and arms secured thereto, of an arc lamp which is supported upon said arms, an inner globe closed at its bottom and removably attached to the lamp, and an outer globe open at its top and bottom and comprising a plurality of sections closely engaging said arms which serve to provide tight joints between the respective globe sections, said outer globe normally engaging, at its upper end, the structure of the lamp, and at its lower end, the pedestal, in order to provide a dead air space around the inner globe.

3. The combination with a pedestal, and oppositely disposed and upwardly projecting arms secured thereto, of an arc lamp supported upon said arms and centrally disposed relative thereto, a removable closed inner globe attached to the lamp, a divided outer globe normally providing a dead air space which substantially surrounds the inner globe, the sections of the divided outer globe being hinged to one of said arms. and resilient means associated with said arms and engaging said globe sections when the globe sections are in operative position in order to provide tight joints therebetween.

4:. The combination with a pedestal and communicating at its top with the conmally engaging the lamp structure and the pedestal to provide a dead air space which substantially surrounds the said inner globe and closely engaging the lips formed on said arms to provide tight joints between the globe sections.

5. In a post-type inclosed arc lamp, an upright pedestal, a pair of oppositely disposed supporting arms secured thereto, resilient and spaced lips integrally formed and longitudinally disposed upon said arms, an arc lamp supported upon said arms, an outer globe divided into two sections, each being hinged to one of said arms, metallic rims embracing the cooperatively engaging edges of said sections, said globe sections in operative position closely engaging said lips of the supporting arms, thereby providing Water tight joints between the said globe sections.

In testimony whereof, I have hereunto subscribed my name this 25th day of Nov.,

FREDERICK H. MILLER. Witnesses:

B. B. Hmns, M. O. MERZ.

t'l'opies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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