Improvements in Filtering Apparatus.
Year: 1898

page_text: Date of Application, 20th June, 1900
Complete Sannifination Lott 16th Mar 1899 Accepted 22nd Apr. 1899
Date OT
Complete Specification Loft, 16th Mar 1899- Accepted 22nd Apr. 1899
7
Improvements in Filtering Apparatus.
We, L. HUGH BRISTOWE & Co. LIMITED, of Albany Buildings, 47, Victoria
Street, in the City of Westminster, Sanitary Engineers, and WILLIAM ROBERT
RENSHAW, of Phoenix Engineering Works, Stoke-on-Trent, a Director of the
above-named company, do hereby declare the nature of this invention to be as
follows:-
-
This invention relates to filtering apparatus of the class in which when the
filtering medium requires cleansing arms radiating from a hub are vertically
reciprocated by a hydraulic cylinder or other device, through the said filtering
medium, and the invention has for its object to provide means whereby the radial
arms shall be caused to pass through a different bed or portion of the filtering
medium each time they are depressed.
There are various ways of carrying out our present improvements the following
arrangement being given merely as an example.
According to this arrangement we secure a ratchet wheel or circular rack to
the before mentioned hub and pivot to the filter casing a pawl in such position that
the said ratchet wheel or rack will engage with it at or near the end of the upward
stroke of the hub, the arrangement being such that at each such engagement the
hub, and consequently the radial arms, will be turned through a part of a revolu-
tion so that when the said arms are next depressed they will descend through
portions of the filtering medium slightly in advance of those through which they
descended at their last previous depression.
When the ratchet wheel or rack is lowered away from the pawl the latter returns
to its normal position under the influence of either its own weight or a spring, a
suitable stop being provided to arrest its descent when it reaches the position
necessary for again engaging with the ratchet wheel or rack at the next upward
movement of the arms.
The arms may be hollow and provided with perforations for enabling the
cleansing liquid to be distributed through them into the filtering medium, and
for convenience of application to existing filtering apparatus the before described
ratchet wheel or rack may be formed in two or more segments capable of being
readily secured together.
COMPLETE SPECIFICATION,
Improvements in Filtering Apparatus.
We, L. HUGH BRISTOWE & COMPANY LIMITED, of Albany Buildings, 47, Victoria
Street, in the City of Westminster, Sanitary Engineers, and WILLIAM ROBERT
RENSHAW, of Phoenix Engineering Works, Stoke-on-Trent, a Director of the

page_text: above-named company, 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 filtering apparatus of the class in which, when the
filtering medium requires cleansing, arms radiating from a hub, are vertically
reciprocated by a hydraulic cylinder or other device, through the said filtering
medium, and the invention has for its object to provide means whereby the radial
arms shall be caused to pass through a different bed or portion of the filtering
medium each time they are depressed.
There are various ways of carrying out our present improvements the arrange-
ment hereinafter described and illustrated in the accompanying drawings being
given as an example.
Figure 1 is a view partly in elevation and partly in vertical section of a portion
of a filtering apparatus with our improvements applied thereto, and
Figure 2 is a horizontal section of the same.
According to the arrangement shewn in the drawings we secure a ratchet wheel
or circular rack A to the before mentioned hub B, and pivot to the filter casing C,
a pawl in such position that the said ratchet wheel or rack will engage with it
at or near the end of the upward stroke of the hub, the arrangement being such
that at each such engagement the hub B, and consequently the radial arms 11
connected thereto, will be turned through a part of a revolution so that when the
said. arms are next depressed they will descend through portions of the filtering
medium slightly in advance of those through which they descended at their last
previous depression.
When the ratchet wheel or rack A is lowered away from the pawl D the latter
returns to its normal position under the influence of either its own weight or a
spring, a suitable stop d being provided to arrest its descent when it reaches the
position necessary for again engaging with the ratchet wheel or rack at the next
upward movement of the arms, all as shewn in dotted lines in Figure 1.
The arms B may, as shewn in Figure 1, be hollow and provided with perfora-
tions for enabling the cleansing liquid to be distributed through them into the
filtering medium, and for convenience of application to existing filtering apparatus
the before described ratchet wheel or rack may be formed in two or more segments
capable of being readily secured together upon or around the hub B.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is:-
1. In apparatus for filtering liquid, provided with vertically reciprocated arms,
a device for imparting to the arms a step-by-step rotary movement in a plane
perpendicular to the direction of reciprocation substantially as herein before
described with reference to the accompanying drawings.
2. In apparatus for filtering liquid the combination with vertically reciprocated
arms of a ratchet and pawl device substantially as and for the purpose herein before
described and illustrated in the accompanying drawings.
Dated this 14th dow of Vauh 1900
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.