Improvements in Filter Presses.
Year: 1899

page_text: WILLIAM WARNER, Hope Drive, The Park, Nottingham, Civil Engineer, do
hereby declare the nature of this invention to be as follows:-
-
This invention has reference to improvements in the opening and closing of
filter presses.
In filter presses having hydraulic rams, balance weights hung upon chains are
employed, to bring back the moveable end plate and thus open the press.
The ram is employed to close the press and hold the plates tight during filter-
ing, the power must be sufficient to withstand the pressure inside the filter press,
with the addition of the balance weights.
As the pressure upon the ram is direct from the accumulator, there is a con-
tinual vibration going on upon the surfaces of the filter cloths, owing to leakage
through the leather cup rings causing a little variation in pressure, there is
also risk of stoppage caused by the accumulator emptying, especially when a
number of filter presses are fed from one accumulator.
The object of this invention is to economize hydraulic power, wear in filter
cloths, and risk of stoppage.
I abandon the balance weights for opening the filter press, and employ a small
hydraulic piston at the back of hydraulic ram cylinder.
The filter press is closed by the hydraulic ram in the usual way, but afterwards
held tight by distance pieces, worked by side screw nuts or cams with levers,
the water pressure upon the ram may be released during the operation of filtering,
thereby saving waste by leakage also preventing vibration upon the cloths, and
as the pressure is not required there is no risk of stoppage by empty accumulator.
As the hydraulic ram has no balance weights to lift, it may be made less than
formally, saving cost in manufacture and economy in water under pressure.
Dated this 4th day of May 1899
WILLIAM WARNER.
Improvements in Filter Presses.
WILLIAM WARNER, Hope Drive, The Park, Nottingham, Civil 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 follow-
ing statement:-
This invention has reference to improvements in the opening and closing of

page_text: In filter presses having hydraulic rams, balance weights hung upon chains are
employed, to bring back the moveable end plate and thius open the press.
The ram is employed to close the press and hold the plates tight during filter-
ing, the power must be sufficient to withstand the pressure inside the filter press,
with the addition of the balance weights.
As the pressure upon the ram is direct from the accumulator there is a con-
tinual vibration going on upon the surfaces of the filter cloths owing to leakage
through the leather cup rings causing a little variation in pressure, there is
also risk of stoppage caused by the accumulator emptying, especially when a
number of filter presses are fed from one accumulator.
The object of this invention is to economize hydraulic power, wear in filter
cloths and risk of stoppage.
I abandon the balance weights for opening the filter press, and employ a small
hydraulic piston at the back of hydraulic ram cylinder.
The filter press is closed by the hydraulic ram in the usual, way, but afterwards
held tight by distance pieces, worked by side screw nuts or cams with levers.
The water pressure upon the ram may be released during the operation of filtering
thereby saving waste by leakage also preventing vibration upon the cloths, and
as the pressure is not required there is no risk of stoppage by empty accumulator.
As the hydraulic ram has no balance weights to lift it may be made less than
formally, saving cost in manufacture and economy in water under pressure.
Figure 1 is a plan of a filter press showing the hydraulic ram with cylinder
, and hydraulic piston with cylinder at the back.
Figure 2 is a sectional elevation of distance piece with cam and lever.
Fgure 3 is a plan of the end of a press showing hydraulic cylinder with distance
pieces, cams and levers.
Figure 4 represents an elevation of a press.
Figure 5 represents view of a press cylinder end.
In describing my invention I use like letters for similar parts; a the valve
to admit material to be filtered b back end standard of filter press c filter plates d
side bars to support filter plates, e front end of filter press which is made moveable
upon the side bars d. All these parts named are usually employed in filter
presses but the parts about to be described are new and form part of my invention
f is the hydraulic ram g the cylinder for ram h packing gland which I prefer to
use instead of cup leathers, as being less liable to get out of order, and easily a
adjusted. This ram is made of suitable size to force the whole of the plates
together and hold them against pressure put upon the press internally. The
piston to draw back the moveable end instead of weights, working in the
cylinder k, the water pipes with starting valve are shewn at 7 connected to both
cylinders m the distance pieces whilch allow the necessary space to clear a press of
cakes without long screws or other means taking longer time n screw and wheel
to relieve the distance pieces when sticking o tightening nuts and cams to keep
the moving end in position during filtering. p levers to press the distance pieces
before pressure is taken off the hydraulic ram q is the end frame to support
the ram, piston and cylinders with gear.
My improvements are worked in the following manner.
An empty filter press would be closed by water under pressure passing into
the large hydraulic cylinder and immediately it is tight the distance pieces are
placed into position, one end butting against the moveable end and the other
against the cam or screw nut, then by pushing the levers they take hold and
relieve the hydraulic ram.
The material to be filtered is then passed into the press through valve a.
When the material has been filtered the feed valve is closed, the levers pushed
to relieve pressure upon the moveable end, the distance pieces are then lifted
out and the hydraulic piston brought into action thus opening the press. It
is obvious that the screwed nut o Figure 1 is practically the same as the cam o
Figure 2 and a wedge driven in would answer the same purpose.

page_text: Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I declare that what I
claim is-
1. The combination of hydraulic ram, piston and cylinders as shown and
described.
2. The combination of hydraulic ram, piston and cylinders as shown and
described with distance pieces, nuts, cams, and levers substantially as illustrated
and described.
בזי
WILLIAM WARNER.