same to Lamp-burners.
Year: 1888

page_text: same to Lamp-burners.
I, HENRY HARRIS LAKE, of the firm of Haseltine Lake & Co. Patent Agents,
Southampton Buildings in the County of Middlesex 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 :-
This invention relates to chimneys designed for use with lamps, and has for its
object the production of safe, efficient and convenient chimneys.
In the accompanying drawing
Figure 1 represents, in front elevation the invention as applied to the cominon sun
burner.
Figure 2 represents the chimney and burner illustrated in Figure 1 as having been
turned to the left about its vertical axis one eighth of a turn or 45 degrees.
Figure 3 is a sectional view of the chimney on the lines 4, 4, and 5, 5, of Figures 1
and 2 respectively, looking down.
The improved chimney is especially applicable to what is known as the sun burner
and can be adjusted and removed by a straight vertical movement. The chimneys
ordinarily used on these burners are straight at their exterior lower ends and are
simply held in position on the burner by the friction of the spring clamps in contact
therewith.
I have added to the chimney a number of elongated outwardly curved flaring cheeks,
the curvature of which corresponds substantially with the curvature of the spring
clamps of the burner and between these elongated curved cheeks are straight guide-
ways for the passage of the clamps in taking off or putting on the chimney. After
the chimney is brought into contact with the base plate of the burner it is given a
slight turn so as to bring the elongated cheeks opposite the spring-clamps. In this
position the elongated curved cheeks serve to lock the chimney against the possibility
of accidental displacement and they also afford bearing surfaces for the spring-clamps
of such shape that the clamps have a tendency to exert a downward force upon the
chimney, the effect of which is to keep the lower edge of the chimney always in contact
with the base-plate of the burner.

page_text: In the said chimney the elongated curved checks permit the grasping of the
chimney by the clamps at points so far above the lower end of the chimney as to
greatly reduce the leverage and to permit the use of the freely yielding spring-clamps
of the sun burner.
The burner 6 represented by full and dotted lines in Figures 1 and 2 is one of the
most common style used. It is sold as the sun burner; style A. The burner being
so well known, a brief description will be found to be sufficient.
It is provided with the base-plate 7 against which it is desirable that the lower edge
of the chimney should be held in close contact, in order to prevent the flickering of
the light which may be caused whenever any air enters the chimney by means of other
openings than are provided in the usual manner.
The burner is also provided with the usual spring chimney clamps 8 of the usual
form and number.
The chimney 9, of glass, is provided, at its lower portion with a number of elongated
outwardly curved locking cheeks 10, equal in number, to the number of spring clamps.
It is also provided' at its lower portion with a number of straight, or nearly straight
guideways 11 in number (four) equal to the number of curved cheeks. In other
respects the chimney is of a common form.
In the putting of the chimney into its position upon the burner, the chimney is held
so that its straight or nearly straight guide-ways 11 are presented to the slight
resistance offered by the spring clamps. Then the chimney is given a one eighth turn
about its vertical axis, and the chimney is then firmly held by the spring clamps as
represented by Figure 8 resting against the elongated curved cheeks.
The outer curve of the curved cheeks of the chimney and the inner curve of the
spring clamps are made as represented by Figure 2, so that, the spring tension of the
spring clamps is such as will tend not only to hold the chimney securely in position,
but, will exert a force downward upon the chimney, the effect of which is to keep the
lower edge of the chimney always in close contact with the base plate, thereby pre-
venting injurious air currents, inside the chimney which would cause the flame to
flicker and become unsteady.
The straight or nearly straight, guide ways may have a slight curve if desired. The
result sought to be obtained in the shape of these portions being to make them of
such a form as will present only the slight resistance desired to the forcing the chimney
into its position upon the burner.
The curved cheeks are of a curve sufficient to prevent the tipping of the chimney
from the burner, unless a force be used greater than the burner shown will bear. By
experiment it has been proved that a force may be applied to remove the chimney
made as represented from its burner vertically, sufficient to take the burner apart
without drawing the chimney from its position.
A chimney made as represented may expand and contract without breakage.
It is obvious that my chimney presents many advantages such as low cost, adapt-
ability to burners now in use, nonliability to injurious effects of expansion and
contraction, prevention of unsteady flame due to injurious air currents, and perfect
safety.
Chimneys for many purposes, and for street car lamps and the like, if desired, may
have vertical recesses, as 12, made in the curved cheeks as represented by dotted lines
Figure 3 of a width sufficient to receive the spring clamps and of a depth as will
prevent resistance to any rotary movement of the chimney..
It is evident that the number of curved cheeks should be equal to the number of
spring clamps, which may be, at pleasure, four, more or less.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is.:-
First. A lamp chimney provided at its lower end with straight or approximately
straight exterior longitudinal guideways and between said guide ways with outwardly
flaring elongated locking cheeks.

page_text: Second. The combination of a lamp burner, the base plate of which is provided with
a number of upwardly projecting inwardly curved spring clamps disposed at intervals
around its periphery, and a lamp chimney fitting over said base plate and provided at
intervals with straight or approximately straight longitudinal guide ways for the
passage of said spring clamps in adjusting or removing the chimney and between said
guide ways with elongated outwardly curved locking cheeks, the curvature of which
corresponds approximately with the inward curvature of the clamps.
Third. A lamp chimney provided at its lower end with straight or approximately
straight exterior longitudinal guide-ways and between the guide-ways with outwardly
flaring elongated locking cheeks, said checks having vertical recesses.
Fourth. The combination of a lamp burner, the base of which is provided with
a number of upwardly projecting inwardly curved spring-clamps disposed at intervals
around its periphery, and a lamp chimney fitting over said base-plate and provided
at intervals with straight or approximately straight longitudinal guide-ways for the
passage of said spring clamps in adjusting or removing the chimney and between said
guide-ways with elongated outwardly curved locking cheeks, the curvature of which
corresponds approximately with the inward curvature of the clamps, said cheeks
having vertical recesses in which said clamps may rest.
Dated this 27th day of November 1888.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.