Improvements in Revolving Lamps.
Year: 1892

page_text: Date of Application, 29th Jan., 1892
Complete Specification Left, 28th Oct., 1892—Accepted, 31st Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in Revolving Lamps.
I JOHN MAIN 98 Barrington Road Brixton Engineer do hereby declare the
nature of this invention to be as follows:-
This invention relates to an improved method of causing lamps burning gas or
oil such as show lamps fixed outside shops &c. to revolve on their vertical axis.
In the upper portion of the lamp where the heat escapes a windmill or hot air
turbine is placed supported by a spindle & rotating in a circular tube. Underneath
the windmill are placed guides radiating from the centre similar in shape to the
blades of the windmill but curved in the opposite direction so as to deffect the hot
air against the blades of the windmill more nearly at right angles to their inclined
surfaces thus increasing the power.
The spindle carrying the windmill has attached to it a pinion which is geared
into a larger toothed wheel this wheel is fixed on an axis & has at its lower end
another pinion which is also geared into another larger toothed wheel attached to
the framework which revolves inside the lamp.
Another method is to cause the lower portion of the lamp to rotate leaving the
upper part which suspends it stationary.
In this case the body of the lamp is attached to the framework which is actuated
by the last mentioned larger wheel which carries the body round with it.
The revolving part may be fitted with glass of various colours or the body of
lamp if stationary may be glazed with clear glass & the framework inside be fitted
with coloured glass.
At the bottom of the lamp a lens is fitted of such a focus as to throw an image
on the ground underneath of letters or designs fixed to the revolving part. The
lens may revolve or be stationary but the image will thus always revolve.
The same arrangement of gearing may also be fitted to electric lamps except the
hot air turbine for which is substituted a small electric motor.
Dated this 29th January 1892.
COMPLETE SPECIFICATION.
Improvements in Revolving Lamps.
I, JOHN MAIN 98 Barrington Road Brixton Surrey Engineer 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:-
•
Figure 1 of the accompanying drawings is an elevation partly in section of my
invention.
In the upper portion of the lamp a windmill A. is mounted on a vertical axis B.
turning in bearings C & D. Beneath the windmill A is fixed a set of stationary
guide blades E. Each blade in this set is curved or set at an angle so as to deflect
the hot air & deliver it on to the windmill as nearly as possible at right angles to
the surface of its blades which are curved or inclined in the opposite direction
to the guide blades.
At the lower end of the spindle B is fixed a pinion F. which gears into a wheel G.
mounted on an axis H. On the lower end of the axis H. is mounted another pinion I
which gears into a wheel J. connected to the upper end of the vertical axis K by a
friction joint consisting of a split tube L.

page_text: The axis K turns on two bearings the lower of which M. is supported by a cross
bar forming part of the external fixed framework O. of the lamp. The upper
bearing N of the axis K. is attached to the bracket carrying the gearing which
bracket is supported by stays P. P. connected to the upper part of the fixed
framework O.
The revolving body Q of the lamp is attached at two points R & S. to the
axis K so as to revolve with it as shown in the drawing. The gas is brought inside
the lamp in the usual way & burns above the gearing & below the windmill at the
jets T. T. T.
An earthenware reflector U may be fitted in the top of the lamp above
the jets.
The drawing represents a suspended lamp but the fixed framework may also be
supported on a pillar or in any other suitable manner. It may also be employed
inside shops or elsewhere to show advertisements or to show light goods.
Figure 2 is a drawing in section of the bottom portion of a lamp where a lens is
fitted to project letters or designs on to the ground.
01 0¹ is the framework which carries the body of the lamp Q¹ Q' turning on its
axis K' in a bottom bearing M' and a top bearing placed as N in Fig. 1.
A short tube X is attached to the bottom of the framework O' and in this tube
the lens Y is fitted.
In this form of the lamp a glass disc Z rests on the cross stays which are attached
to the revolving axis K at R, or the disc may rest on the wheel J. This disc has
letters or designs on its surface.
The light from the jets above illuminates the disc and the lens Y shown in
Fig. 2 being placed at a proper focal distance from the disc %, an image of the
letters or designs is thrown on to the ground underneath the lens Y and revolves as
the disc Z turns round.
Having now particularly described & ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1st. A windmill or hot air turbine with fixed guide blades in combination with
the gearing for turning the body of a lamp as herein before described & shown in
the drawings.
2nd. A lamp having a lens fixed in the bottom of the framework to project letters
or designs attached to the revolving body of the lamp on to the ground as herein-
before described.
3rd. The application of a revolving lamp as described for showing advertisements
or light goods.
Dated this 28th day of October 1899