Improvements in Apparatus for Repairing Asphalt Pavements.
Year: 1895

page_text: Date of Application, 9th July, 1895-Accepted, 10th Aug., 1895
[Communicated from abroad by THE UNITED STATES REPAIR AND GUARANTY
Co., of No. 36 La Salle Street, Chicago, Illinois, United States of America,
Manufacturers.]
Improvements in Apparatus for Repairing Asphalt Pavements.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co. Patent Agents,
45 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 improvements in apparatus for repairing asphalt
pavements, but is more particularly designed as an improvement upon the invention
set forth in Letters Patent of the United States No. 501,536 dated 18th day
of July, 1893. In that Patent an air-pump attached to the apparatus was used at
intervals to maintain a pressure upon the liquid fuel in the tank for forcing the
same to the burners, and the burners were shown and described as hooded with
a sheet metal shield to hold and confine the heat to that portion of the pavement
against which the burners were directed. Such construction necessitated the
occasional and sometimes frequent operation of the air-pump, which necessarily
resulted in frequent changes of pressure in the tank and consequent difference in
the temperature of the blast of heat, beside which, the sheet metal hood from the
excessive temperature to which it was subjected would soon become warped and
bent beyond usefulness.
The objects of my invention are to have the apparatus of such character that the
heat of the burners may be utilized to produce and maintain pressure in the fuel
tank whereby a more uniform heat is produced and to have a hood of novel, cheap
and durable construction which will not become warped or bent by the action of
heat in use. These objects are attained by the devices illustrated in the
accompanying drawings, in which
Figure represents a top or plan view of an apparatus embodying my
invention.
Figure 2, a side elevation thereof; and
Figure 3, a detail, transverse, vertical section on the line 3-3 of Figure 1.
Similar letters of reference indicate the same parts in the several figures of the
drawings.
In the general parts and arrangement of parts of my present apparatus, it is
substantially the same as that contained in the foregoing Patent, consisting
generally of a tank A for containing liquid fuel, such as gasoline, mounted upon a
pair of ground wheels B and controlled in its movements by handles C extending
to the rear thereof. On the rear end of the tank is mounted an air pump D, of any
suitable construction and mode of operation, concected by a pipe E with the upper
portion of the tank, for producin: the initial pressure upon the fuel contained in the
tank. Leading from the tank is a pipe F which preferably passes through the
upper side of the tank aud terminates in a suitable nozzle G near the bottom
of the tank, as indicated by the dotted lines in Figure 2. This pipe leads to the
main supply pipe H having any desirable number of lateral branch pipes I leading
to the burners J, of ordinary construction, the main supply pipe being arranged in
a horizontal position projecting forward from the tank. The pipe F is provided
with a suitable valve K to control the passage of the fuel from the tank to the main

page_text: supply pipe and burners. Suspended from the handles C or from a separate and
suitable framing, and in any suitable manner, is a hood L of oblong or rectangular
shape and, preferably, having a flat top and flaring sides and ends which are
designed to reach nearly to the surface of the pavement being operated upon,
although in practice the exact shape of the hood is not material, as, obviously, it
may be curved or otherwise suitably formed so as to confine the heat in the
immediate neighbourhood of the burners.
The top of this hööd preferably lies in a plane slightly below the centre of the
main supply pipe H and is provided along each side of said pipe with a series of
holes M. through which the burners J project, the arrangement being such that the
branch pipes I, leading to the burners, and the valves controlling the same, will lie
above the top of the hood, protected from the heat of the burners, while the supply
of air to the burners is obtained through the openings M, which are of sufficiently
greater diameter than the burners to supply the required amount of oxygen thereto.
That portion of the hood, underlying the main supply pipe H, is perforated, cut
away or otherwise constructed, so as to expose the end part of the said pipe to the
heat under the hood, and this heat converts the liquid fuel in the pipe into a gas,
part of which is used by the burners and part of which flows back through the
pipe F into the tank where it creates and maintains the desired pressure in the tank
to expel all of the fuel therefrom into the supply pipe for continuous conversion
into gas.
The hood shown in the drawing and the one I have used in practice is composed
of wire cloth or netting, which is covered, preferably on both sides, with asbestos
cement or some other non-combustible équivalent material which serves to retain
the hood in the desired shape notwithstanding the action of the heat thereon, and
also confines the heat, which is 'thrown down upon the pavement or surface to be
heated. That portion of the wire cloth or netting which underlies the supply
pipe H is left without any asbestos cement or other covering, so as to expose the
said pipe to the action of the heat from the burners.
While I prefer the construction shown in the drawing, it is obvious that the
burners may get their supply of fuel, either liquid or gaseous, through an entirely
separate pipe or pipes trom that which is exposed to the heat of the burners; and
it is equally obvious that the pipe or pipes which are exposed to the heat of the
burners, so as to produce and maintain gas pressure in the tank, may lie or extend
under the hood instead of having the opening in the hood, as shown in the
drawings, these changes of construction being so simple and obvious as not to
require illustration herein.
A machine constructed in accordance with my present invention possesses the
advantage of being self-feeding and utilizing the heat produced thereby for
the further purpose of producing and maintaining a pressure upon the fuel in the
tank which will remain practically constant during the use of the machine, giving a
steady blast of intense heat and greatly economizing in fuel. Furthermore, a hood,
of the peculiar construction herein shown, will successfully withstand the heat to
which it is constantly subjected in use without warping or twisting, and hence
avoids the loss of heat which would result from the warping and bending of the
hood, and also avoids the danger of the burnera being extinguished by air currents
which would pass inder a warped hood.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to
me by my foreign correspondents, I declare that what I claim is :-
1. In an apparatus for repairing asphalt pavements, the combination with a
series of hooded fluid burners and a reservoir for supplying fuel thereto, said
burners and reservoir being portably mounted, of a pipe communicating with the
reservoir and exposed to the heat of the burners, substantially as and for the
purpose described.
2. In an apparatus for repairing asphalt pavements, the combination with

page_text: a series of hooded fluid burners and a reservoir for supplying fuel thereto, said
reservoir and burners being portably mounted, of a supply pipe connecting the
reservoir with the burners and exposed to the heat of the burners, substantially as
described.
3. In an apparatus for repairing asphalt pavements, the combination with
a series of fluid burners and a reservoir for supplying fuel thereto, said reservoir
and burners being portably mounted, of a hood for said burners and a supply pipe
connecting said burners with the reservoir, lying in a plane with or slightly above the
hood, that portion of the hood underlying said pipe being perforated or cut
away so as to expose said pipe to the heat of the burners, substantially as
described.
4. In an apparatus for repairing asphalt pavements, the combination with a series
of fluid burners and a reservoir for supplying fuel thereto, said reservoir and
burners being portably mounted, of a hood for said burners consisting of wire
cloth or netting plastered with asbestos cement, or equivalent material, substantially
as described.
5. In an apparatus for repairing asphalt pavements, the combination with a series
of fluid burners and a reservoir for supplying fuel thereto; said reservoir and
burners being portably mounted, of a supply pipe connecting the burners with the
reservoir, a hood for said burners lying in a plane with, or slightly below, said pipe,
said hood consisting of wire cloth or netting plastered with asbestos cement,.
or equivalent material, except that portion underlying the said pipe, substantially
as described.
1007
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.