IMPROVEMENTS IN GAS PURIFIER SCREENS OR GRIDS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, HERBERT JOHN HADDAN, of the firm of Herbert and Company, Patent Agents,
of 67, Strand, in the City of Westminster, Civil Engineer, do hereby declare the
nature of said invention for IMPROVEMENTS IN GAS PURIFIER SCREENS OR GRIDS,
a communication to me from abroad by John Cabot, of Massachusetts, United
States, to be as follows:-
In carrying out the improvements each bar of the screen or grid is formed with,
practically speaking, linear or very narrow bearings to rest against the peripheries
of each of the holes for supporting it, the bar being between such bearings without
contact with the periphery or broadway of the hole. Each of the holes is usually
elliptical or oval in its transverse section, in which case the bar is to be prismoidal
or prismatic, or to have a section more or less angular in its perimeter, in order
for the bar when driven into each of the holes of the holder to touch such in
substantially linear or very narrow-bearings, without between such bearings having
contact with the boundary of the hole.
Instead of making each of the holes in each of the holders, a true oval or ellipse
in its transverse section, such hole may have a polygonal section and the bar to
enter such hole may be cylindrical or oval or elliptical so as to touch or bear in
lines or in narrow bearings, the bar between such bearings being out of contact
with the boundary of the holes.
Each of the bar receiving holes of the holder is made elliptical in transverse
section, while each of the bars is made elliptical, but truncated or more or less
angular in section, which causes it when within the hole to touch the periphery
thereof only at the vertices of the angles of section, in which case the bearings of
the bar against the curved surface of the hole, are substantially linear or very
narrow, the bar between such bearings not being in contact with the boundary of
ALL
•

page_text: While this construction of the bars admits of their readier application or removal
relatively to the holders, it is productive of advantage in other respects, as it
enables them to be forced into or extracted from the holders without being
injuriously grooved by them to cause them in practice to gather and hold the
lime, they being easier cleaned of it, when their surfaces are in their normal or
smooth condition or not grooved.
COMPLETE SPECIFICATION. .
I, HERBERT JOHN HADDAN, of the firm of Herbert and Company, Patent Agents,
of 67, Strand, in the City of Westminster, Civil Engineer, do hereby declare the
nature of my invention for IMPROVEMENTS IN GAS PURIFIER SCREENS OR GRIDS,
a communication to me from abroad by John Cabot, of Massachusetts, United States,
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:
९
In the accompanying drawings Fig.1 is a top view. Fig 2 an edge elevation,
and Fig 3 a transverse section of a screen of my improved kind, the nature of the
invention being defined in the claim hereinafter presented. Fig 4 is a section on
an enlarged scale of one of the bars and the part of one of the holders through which
such bar is extended.
In carrying out this improvement each bar of the screen or grid is formed with,
practically speaking, linear or very narrow bearings to rest against the peripheries
of each of the holes for supporting it, the bar being between such bearings without
contact with the periphery or broadway of the hole." Each of the holes is usually
elliptical or oval in its transverse section, in which case the bar is to be prismoidal
or prismatic, or to have a section more or less angular in its perimeter, in order for
the bar when driven into each of the holes of the holder to touch such in
substantially linear or very narrow bearings, without between such bearings having
contact with the boundary of the hole.
.
1.
13
Instead of making each of the holes in each of the holders a true oval or ellipse
in its transverse section, such hole may have a polygonal. section and the bar to
enter such hole may be cylindrical or oval or elliptical so as to touch or bear in
lines or in narrow bearings, the bar between such bearings being out of contact
with the boundary of the holes.
•
'
In the drawings the wooden bars are shown at A, A, etc, and the two holders
thereof at B, the bars being arranged parallel to each other in the said holders and
at equal distances apart.
Each of the bar receiving holes of the holder is shown as elliptical in transverse
section, while each of the bars'is represented as elliptical, but truncated or more or
less angular in section, which causes it when within the hole to touch the periphery
thereof only at the vertices of the angles of section, viz at a, a, a, a, in which case
A ca

page_text: the bearings of the bar against the curved surface of the hole, are substantially
linear or very narrow, the bar between such bearings not being in contact with the
boundary b of the hole.
While this construction of the bars admits of their readier application or
removal relatively to the holders, it is productive of advantage in other respects, as
.it enables them to be forced into or extracted from the holders without being
injuriously grooved by them to cause them in practice to gather and hold the lime,
they being easier cleaned of it, when their surfaces are in their normal or smooth
condition or not grooved.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is;-
The gas purifier screen or grid constructed substantially as described, viz of
metallic holders and wooden bars arranged therein and adapted thereto essentially
as set forth.