Improvements in Filters.
Year: 1899

page_text: Date of Application, 20th Dec., 1899-Accepted, 10th Feb., 1900
COMPLETE SPECIFICATION.
Improvements in Filters.
I, DUNCAN ALFRED MCARTHUR, a Citizen of the United States, residing at
No. 3603, North Sixth Street, in the City of Philadelphia, in the County of
Philadelphia, and State of Pennsylvania, Mechanical 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 state-
ment:
My invention has relation to a filter for oil, water or other fluids; and in
such connection it relates to the construction and arrangement of such a filter.
The principal object of my invention is to provide a cheap, durable and
ellicient filter for liquid, wherein the liquid at its most impure portion is sub-
jected to the action of heat from hot air pipes, whereby the heavier impurities
may be more readily and easily separated from the fluid prior to its delivery
to the filtering media.
My invention stated in general terms, consists of a filter constructed and
arranged in substantially the manner hereinafter described and claimed.
The nature and scope of my invention will be more fully understood from
the following description taken in connection with the accompanying drawings
forming part hereof, in which
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Figure 1, is a vertical sectional view of a filter embodying main features
of my invention.
Fig. 2, is a cross sectional view on the line, of Fig. 1; and
Fig. 3, is a similar view on the line y-y, of Fig. 1.
Referring to the drawings a, represents the main casing of the filter, which
is divided by the conical partition b, into two compartments 6 and The
compartment, located beneath the partition 6, is adapted to contain the purified
liquid and is provided with the sight glass 3, draw-off faucet 64, and air duct
The compartment b', is surrounded by a tubular casing d, between which and
the casing a, forming the wall of the compartment 6, is provided a duct c,
into which the impure fluid is adapted to flow prior to its delivery to the com-
partment 6. In the base of the compartment 6', provided an inlet c', com-
municating with the duct e, to permit the flow of liquid from said duct to the
bottom of the compartment b. The top of the compartment 61, is closed by a pan
or trough f, the base f¹, whereof is solid. Above this base f', is located a
sieve-plate f2, and the wall of the pan f, is cut away at one side as at f³, between
the sieve f, and base f', to form an outlet into the duct e. The top of the pan
or trough f, is normally closed by a lid ft, which is removed to permit of the
liquid being poured through the sieve f. To permit of the ready removal of
the sieve f, from the pan f, so that said sieve may be cleaned or repaired, two
hooks f, are secured as illustrated in Fig. 1, to the screen f
Within the main fluid compartment ₁, is provided a floating filtering vat
or tank g, comprising the hermetically sealed chamber g', enclosing and sup-
porting the concentrically arranged chambers g, and g, wherein an absorbent
filtering material, such as cotton and the like is located. The innermost
chamber, and the outermost chamber g, have at their bases outlets h, for
the fluid, while the intermediate chamber 3, has inlets, in its base communi-
The outlets h, from the
cating directly with the fluid in the compartment 6.
chambers and gt, lead to a conical chamber k, which has an outlet A, at its
base connected with an aperture or outlet, in the apex of the conical base
or partition b, of the main chamber 6, by a hose or flexible pipe k³. Enclosed

page_text: by the innermost chamber g, is a box or receptacle 6, into which a counter-
balancing fluid or weight may be placed to properly support or balance the
float in the liquid. The present filter is peculiarly adapted for the filtration
of oil and similar lubricants and to permit the heavier impurities of the oil
to separate and to be precipitated upon the partition b, as well as to decrease
the density of the oil, there is provided around the outside of the casings d
and a, at or near the partition b, a box m, in which is located a steam coil m'.
The box m, is connected by flue pipes m2, traversing the compartment b', at
or near its base and the box m, is likewise provided with openings m³, leading
to the external atmosphere. The air in the box m, is thus heated by the coil m',
and circulates through the flue pipes m². The oil is thereby heated sufficiently
to cause the separation and precipitation of the heavier impurities, but not
coming in direct contact with the steam coil, the oil is not boiled or raised to
such a
high degree of heat as to cause it to lose its fluidity and become viscous.
In applying the filter to practical use, the parts are all assembled as indicated
in Fig. 1, of the drawings. The lid f, is removed, the fluid poured into the
pan passing through the screen f, and through the outlet f³, into the duct e.
The fluid then passes into the base of the compartment 1, and as it rises in
said compartment 6, the float is raised. The absorbent filtering materials,
by capillary attraction, cause the fluid to traverse the chambers g, and g³, and
from the two latter chambers g and 2, it collects in the conical base k, from
whence it passes by the pipe 3, to the bottom or collecting compartment
As the impure fluid collects in the base of the compartment 6, and before it
passes through the absorbent material it is heated by the hot air flues and the
impure materials are caused to separate from the fluid and to be deposited upon
the partition b. A suitable draw-off cock p, located in the side of the com-
partment, at or near its base serves as a means to draw off the accumulated
impurities from the partition b, and a sight glass p¹, is also provided to indicate
the amount of fluid in the compartment b¹.
Having now particularly described and ascertained the nature and object of my
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. In a filtering apparatus, a main compartment wherein the impure liquid
is adapted to accumulate, a box located outside said main compartment and in
open communication with the external air, a steam coil located in said box,
and hot air flues connected with said box and traversing the main compartment,
substantially as and for the purposes described.
2. In a filter, the combination with a main compartment for containing the
liquid, a float located within said main compartment, an absorbent filtering
material carried by said float and in communication with the liquid in said
compartment, a chamber into which the filtering material is adapted to conduct
the liquid by capillary attraction, a connection between said chamber and a
receptacle for containing the filtered liquid, a box located outside the main
compartment and at or near its base, said box being in open communication
with the external air, a steam coil located in said box and hot air flues cou-
nected with said box and traversing said main compartment, all arranged so
that the liquid is heated by the hot air flues prior to its filtration, substantially
as and for the purposes described.
Dated at Philodalnhia Donelania 41
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