Year: 1898

page_text: JOHN BAKER COLBRAN, 58 & 59, Chiswell Street, Finsbury, E.C., Lamp Manu-
facturer, do hereby declare the nature of this invention to be as follows:-
My invention relates to gas lamps and comprises the improvements herein after
described.
One object of my said, invention being to improve the efficiency and simplify
the construction of arc or globe gas lamps.
For this purpose I provide a circular metal plate the centre of
which is made to recede leaving a projecting rim which may be in
width about one eighth of the total diameter at the lower & inner edge of pro-
jecting rim are provided at equal distances from each other snugs about 1" long
projecting towards the centre of plate the thickness of snugs being about the
depth of recess leaving 2s space between snugs and recessed part of metal plate.
I provide a globe egg shaped or spherical with a short neck, at the top of neck
a flange turned outwards the outside diameter of which is slightly less than the
recessed centre of metal plate, in the flange are made at equal distances from
each other incisions in number & size to correspond with snugs on the afore said
metal plate, so that the neck of globe will fit loosely in recess of metal plate the
incisions in flange allowing flange to pass snugs the globe can then be made to
revolve vertically the flange passing over snugs.
Also I provide a fastening for globe as follows-Pivoted horizontalv to the top
side of metal plate & on the outer edge of rim is a metal bolt in length 3/8"
longer than the width of rim so that the bolt projects 3/8" into the recessed part of
metal plate a slot being cut in the edge of recess to allow its protrusion this bolt
is placed at equal distance between two of the afore described snugs and in width
is narrower than the length of incision in flange of globe immediately under this
bolt is provided a second bolt the same width as the first bolt and a little shorter
a slot is cut in rim of plate in the same direction as the lines of radius through
which a thumb piece is attached to sliding bolt these bolts are so fitted together
that when the sliding bolt is pressed towards the centre of the plate it raises the
pivoted bolt & projects in the same position as the pivoted bolt formerly occupied
& when pressed back the top pivoted bolt drops into former position.
To attach the globe to metal plate the incisions in flange are placed opposite
the snugs of metal plate & pressed upwards when the flange will lift the project-
ing pivoted bolt & rise above the snugs the globe can then be turned vertically
untill one of the incisions in flange come opposite the bolt which will then fall
into incision & thus fasten the globe To detach the globe the sliding bolt is
pressed toward the centre by the projecting thumb piece the sliding bolt will then
raise the pivoted bolt out of the incision in flange of globe the sliding bolt remain-
ing in the said incision--the globe can then be turned when the flange will press

page_text: back the sliding bolt and when the incisions come opposite the snugs the globe
will become detached & the pivoted bolt will fall automatically into position.
According to another modification of my invention I substitute for the plate
with recessed centre a plate with projecting centre and a globe with the flange on
neck turned inwards instead of outwards.
JOHN BAKER COLBRAN, 58 & 59, Chiswell Street, Finsbury, E.C., Lamp Manu-
facturer. I 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:-
The object of my invention being to improve the construction and efficiency
of arc or globe lamps.
For this purpose I provide a plate Fig. 1 and 2 the centre of which is made to
recede leaving a projecting rim of suitable width at the lower and inner edge
of projecting rim are provided at equal distances from each other small snugs s
Fig. 1 and 2 projecting towards the centre of plate. I provide a glass bason with
flange or a globe egg shape or spherical Fig. 3 which may have a short neck, at
the top a flange f Fig. 3 turned outwards the outside diameter of which is slightly
less than the recessed centre of aforesaid plate Fig. 1 and 2.
made at equal distances from each other incisions i Fig. 3 in number and size
In the flange are
to correspond with snugs & Fig. 1 and 2 so that the flange of globe will fit loosely
in recess of plate the incisions i Fig. 3 allowing flange to pass snugs & Fig. 1 and 2
the globe can then be inserted into recess of plate and can be made to revolve ver-
tically the flange f Fig. 3 passing over snugs s Fig. 1 and 2.
Also I provide a fastening e Fig. 1 and 2 for globe as follows pivoted horizon-
taly to the top side of plate Fig. 1 and 2 and on the outer edge of rim is a small
bolt a Fig. 1 & 2 in length a little longer than the width of rim so that the bolt
projects into recessed part of plate a slot being cut in the edge of recess to allow
its protrusion this bolt is placed at equal distance between two of the afore said
snugs & Fig. 2 and in width is narrower than the length of incisions Fig. 3 in
flange of globe a slot is cut in the rim of plate in the same directions as the
lines of radius through which a thumb piece t Fig. I is attached to bolt.
To attach the globe to plate the incisions i Fig. 3 are placed under the snugs s
Fig. and 2 and pressed upwards when the flang f Fig. 3 will lift the projecting
fastening Fig. 1 and 2 and rise into recess above the snugs the globe can then
be turned vertically untill one of the incissions & Fig. 3 comes immediately under
the bolt or fastening which will then fall into incision and thus fasten the globe
to detach the globe the thumb piece Fig. 1 is pressed upwards which will raise
the fastening Fig. 1 out of the incision in flange of globe the globe can then
be turned vertically when the flange will pass under fastening and when the
incisions come above the snugs the globe will become detached and the fastening
will again fall into possition.
C
According to another modification of my invention I substitue for the plate
with recessed centre Fig. 1 and 2 a plate with projecting centre Fig. 4 and 5
and a globe with flange turned inwards Fig. 6. The incisions being cut on
inside of flange and the snugs s
of projecting centre as Fig. 4 and 5.
Fig. 4 being placed on outside and lower edge.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declair that what
I claim is:―
1st. The plate with snugs substantially as described.
2nd. The globe or basin with corresponding incisions in flange.
3rd. The fastening as herein described.
4th. The combination substantially as herein described.