Improvements in and connected with Globes for Electric Arc Lamps.
Year: 1899

page_text: Date of Application, 15th Apr., 1899-Accepted, 24th June, 1899
COMPLETE SPECIFICATION.
Improvements in and connected with Globes for Electric Arc Lamps.
We, HENRY STENZ, of 198, 5th Avenue, Chicago, in the County of Cook anl
State of Illinois, United States of America, and JOSEPH J. WEYER, of Faribault.
in the County of Rice and State of Minnesota, United States of America, Electri-
cal Manufacturers, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
One of the chief objections urged against electric are lights is the casting of
deep shadows by the vertical frame bars, and the difficulty experienced in reach-
ing the electrodes when it is required to trim the lamp. It is the purpose of
the present invention to provide simple and novel means for overcoming thesa
objectionable features and to diffuse the light so that the deep shadows usually
cast by the frame bars will be dissipated, and whereby the carbons can be quickly
and easily reached when it is required to trim the lamp.
The invention resides in a globe composed of prism or ribbed or corrugated
glass or suitable translucent material, said globe having a movable section con-
stituting a door which can be turned aside so as to expose the electrodes and
permit of ready access thereto when it is required to trim the lamp, or for any
other desired purpose.
For a full understanding of the merits and advantages of the invention, refer-
ence is to be had to the accompanying drawing and the following description.
The improvement is susceptible of various changes in the form, proportion,
and the minor details of construction, without departing from the principle or
sacrificing any of the advantages thereof.
In the accompanying drawing,
Figure 1 is a view in elevation of an electric are lamp provided with a globe
embodying the characteristic features of the invention.
Figure 2 is a horizontal section on the liner of Figure 4, looking upward.
the full lines showing the door open, and the dotted lines the closed position of
the door.
Figure 3 is a plan section on the line y-y of Figure 4.
Figure 4 is a vertical section.
Figures 5 show some of the many forms in which the sections of the globe may
be constructed.
Corresponding and like parts are referred to in the following description and
indicated in the several views of the drawing by the same reference characters.
The electric are lamp illustrated is of ordinary construction and comprises a
casing 1 enclosing the feeding mechanism for the upper carbon, a plate 2 having
a socket to receive the lower carbon, and connecting rods or bars 3 between the
casing and plate 2. The globe which constitutes the chief feature of the inven
tion, is supported by means of the plate 2, or in any convenient way according
to the style and variety of lamp with which it is used.
The globe consists of similarly formed upper and lower frames and interposed
sections 4 of glass or other translucent material capable of use in this connection.
The sections comprising the body of the globe may be corrugated, fluted, ribbed,
crimped, or similarly formed so as to insure a diffusion of the rays of light, thereby

page_text: obviating the casting of deep shadows by the frame bars 3, or like means,
employed for connecting the parts of the lamp carrying the upper and lower
electrodes. The outline of the sections will depend upon the configuration and
design of the globe, and as shown, the globe is contracted at its lower end, hence
the globe sections are correspondingly deflected at their lower ends so that the
sections unitedly provide a globe of the desired pattern.
The upper and lower frames 5 are channeled in their opposing faces to receive
the edges of the sections 4, and the channels have lugs 6 to enter notches in
the globe sections and retain them in place, and have other lugs 7 which are
apertured for the reception of the rods or bolts 8, by means of which the upper
and lower frames are connected. Corresponding parts of the upper and lower
frames are made separable, as shown at 9, and with the globe section applied
thereto constitute a door which can be thrown aside when access to the electrodes
is desired. This door may be movable in any direction, and as shown, it is hinged
at one end by means of bolts or pins 10 passing through corresponding apertured
Jugs formed with the movable sections 9 and at one end of the frames intercepted
by the opening which is closed by the door. Extensions 11 are provided at the
free ends of the movable sections 9 and are adapted to engage with offstanding
projections 12 at the ends of the frames against which the sections 9 close. The
projections 12 are recessed in their top sides to receive the extensions 11, thereby
providing for holding the door closed against accidental opening. It is to be
understood that the hinged connection between the parts 9 and the frame are
sufficiently loose to admit of the door receiving a limited vertical movement at
its free end, whereby the parts 11 may enter and leave the depressions of the
parts 12.
Within the spirit of the invention, it is immaterial whether the globe is placed
exterior or interior to the frame bars 3, and it is contemplated to apply fluted
ribbed or crimped glass, or translucent material, to any globe in such relation as
to diffuse the rays of light and prevent the casting of shadows.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:
1. In connection with electric are lamps, the combination of upper and lower
frames comprising corresponding hinged sections which are provided at their free
ends with extensions, offstanding projections at the ends of the frames against
which the free ends of the hinged sections close recessed in their top sides and
adapted to receive the said extensions of the hinged sections, and fluted, ribbed
or corrugated translucent sections secured between corresponding parts of the
upper and lower frame, substantially as and for the purpose set forth.
2. In connection with electric are lamps, the combination of upper and lower
frames of different size, and integral globe sections crimped or corrugated and
secured between said frames and having the end portion adjacent to the smaller
frame contracted, substantially as set forth.
3. In connection with electric are lamps, the combination of upper and lower
frames of different size having corresponding hinged sections, globe sections
corrugated or crimped and fitted between said frames and having an end portion
contracted, and tie rods for securing the said frames together and holding the
integral crimped globe sections hetween them, substantially as described.
Dated thin 14h
For the Applicants,
J. G. LORRAIN, M.I.E.E., M.I. Mech. E.,
Norfolk House, Norfolk Street, London, W.C.,
Chartered Patent Agent.