Improvement in Filters for Water.
Year: 1897

page_text: Date of Application, 26th Nov., 1897
Complete Specification Left, 22nd Aug., 1898--Accepted, 26th Nov., 1898
Improvement in Filters for Water.
We, THOMAS MALLINDER, of 33, Bradford Road, Batley, Foreman Founder, and
WILLIAM GREENWOOD, of Vernon Road, Heckmondwike. Foreman Mechanical
Engineer, both in the County of York, do hereby declare the nature of this
invention to be as follows:
Our invention relates to an improvement in filters for water, so as to make them
self cleaning, to effect this we make the filtering vessel, preferably of cast iron in a
vertical, circular form, with a removable top. the central part of the chamber is
filled with the usual filtering materials, such as charcoal, asbestoes cloth, felt and
the like the upper part of the chamber has the water inlet, just above the filtering
material; on the opposite side, and on the same level, is the outlet for dirty or
unfiltered water; at the bottom, below the filtering material, is an outlet for filtered
water, and in this chamber is placed an inverted air vessel, in diving bell fashion.
To work the filter, the water inlet is coupled to the town's main or other source
of supply, the lower tap will then discharge filtered water, the upper outlet tap.
when opened will discharge all impurities accumulated on the top of the filtering
material, also the air vessel, being relieved of pressure. will force a quantity of
water up through the said filtering material, carrying with it the impurities, which
are immediately washed out through the upper outlet tap, when this is closed, the
water again compresses into the air vessel, until the upper outlet tap is again
opened, thus automatically cleaning itself, every time any unfiltered water is
required.
Dated this 24th day of November 1897.
THOMAS MALLINDER.
WILLIAM GREENWOOD.
Improvement in Filters for Water.
We, THOMAS MALLINDER, of 33, Bradford Road, Batley, Foreman Founder, and
WILLIAM GREENWOOD, of Vernon Road, Heckmondwike, Foreman Mechanical
Engineer, both in the County of York, do hereby declare the nature of this inven-
tion 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 our invention is to construct water filters so that they can be
connected to the ordinary water supply, and by their special construction they are
self cleansing. taking away all impurities, and requiring little or no attention.

page_text: DESCRIPTION OF DRAWINGS.
Fig. 1 is an elevation of our improved filter, showing taps and connections.
Fig. 2 is a sectional elevation of Fig. 1 without taps or connections.
We employ a filter, the body of which consists of three parts. A is the central
part, and is charged with charcoal, asbestos, cloth, felt, or any suitable filtering
material. The top part 1 consists of a chamber with inlet and outlet D); to the
inlet C is attached the water supply direct from the pipes from the main.
To the outlet D is affixed a tap for drawing off unfiltered water when required.
The water to be filtered passes through perforations of plate E, under ball valve F
(by means of small passages F in the valve seating), and through the filtering
medium in the central chamber A, and through the perforated plate E1 (which rests
on ledge or projection G) to the bottom chamber H, in which is the bell cover J,
which, as it is filled with filtered water, compresses the air therein, and when water
is drawn off from the tap in the top chamber, the pressure within the bell cover is
decreased, and the air therein expands and forces the filtered water in the bottom
chamber back through the central chamber (the valve F lifting and thus giving a
free passage), carrying with it all dirt and impurities which may have accumulated
at the top of the filtering material, thus being by its action self cleansing each
time unfiltered water is drawn.
The filtered water is drawn off through the outlet tap K at the bottom of the
filter. L is a plate on the underside of the ledge or projection G, M are openings
into the bell chamber, N are asbestos sheets or packing.
The body of the cylinder may be made of iron made rustless, stoneware, glass, or
of any suitable material, and the parts are bolted or secured together in any suitable
manner.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:
1. The construction of a water filter to which water is supplied direct or under
pressure, and which is self cleansing each time unfiltered water is drawn off from
the same, substantially as described.
2. The water filter consisting of the chambers A, B, and H, inlet C and outlet D,
valve F, perforated cover plate E, filtering material and plate El, bell cover J. and
outlet tap K, as and for the purposes substantially as shown and described.
Dated this 20th day of August. 1898.
JOHN
WALSH,
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent for the Applicants.