AN IMPROVED DOUBLE CORD' ACTION FOR BLIND OR MAP ROLLERS, AND OTHER SIMILAR PURPOSES
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
We, EDWIN VERITY and JOSHUA MARLAND VERITY, of Call Lane, Leeds,
Ironmongers, and BENJAMIN BANKS, of Meadow Lane, Leeds, Brass Worker, all
in the County of York, do hereby declare the nature of our said Invention-for
"AN IMPROVED DOUBLE CORD' ACTION FOR BLIND OR MAP ROLLERS, AND OTHER
SIMILAR PURPOSES," to be as follows:-
==
This Invention has for its object the production of a simplified but efficient and
reliable "double cord" action for raising and lowering window blinds, maps, and
other similar articles, and it may be thus described :-
The system or principle. upon which our action is based and constructed, is
that of sustaining or preventing the "running down" of the blind or other article,
by means of a frictional "grip" or "break" action, and this produced or obtained
automatically by and from the weight of the blind or other article and the roller
and its furniture; and, in carrying it into effect, we take the ordinary wooden or
other roller, and we fit the ends with metal "furniture or fittings, similar, in their
general features, to those used with the ordinary "double cord" action and "rack,"
but constructed to act in such a manner,-in conjunction and combination with
the supporting brackets,-
-as not to require the latter,-the "rack,"-as herein-
after explained.
"
The before-named frictional "grip" or sustaining power, is obtained by the use
of a wedge or wedging action, arranged to act upon, or in connection with either
the bearing pivot, or the cord pulley or both, as circumstances may require ;—in
the former instance by a fixed wedge expanding the pivot, which is enlarged and
"split" for that purpose; and in the other or latter, by the pivot, or a block upon
it, constituting one side of the wedge, and the pulley, or a side rib or flange
upon it, the other side; and these, acting in a similar manner to the former,―
that is,-upon sloping or wedging surfaces,-will cause the weight to produce the
wedging and grip, and thus sustain or prevent the roller from revolving, the
"downward" or unrolling way, whilst allowing perfect freedom of action when
eased, or relieved of the weight; and it will be evident that in both cases or
arrangements, the amount of grip or sustaining power will depend mainly upon
the angle of the wedge or wedging surfaces, and we therefore sometimes render
[Price fid 1

page_text: this adjustable,-by altering the said angle,-to suit the various sizes and weights
of blinds and other articles, as circumstances may require.
"
«
We now fit, upon the upper part of the inside face of the same main or "pulley
end" bracket, before referred to, a pair of small deep grooved pulleys,-or
dummy" equivalents,-placed above the main pulley, and at about 45 degrees
on each side of the vertical centre line of it and its pivot, and so that the cord,
when passed under the main pulley, and over each of these, shall "clip," or be in
contact with, about three fourths of the circumference of the "milled" groove in
the said main pulley, and thence, passing down as a loop,-being endless or
double," the pulling of either the front or the back portion of the cord, any-
where below the said small pulleys or their equivalent, will first lift the main
pulley and roller, and free them from the wedging "break" or sustaining grip or
action, and then either raise or lower the blind or other article, as desired, (according
to whether the front or the back cord is pulled) and, when loosed, will allow the
roller and pulley to fall again into the wedging or gripping position, for supporting
the blind and preventing "running down or unrolling, and this, without the use
of, or the necessity for, the ordinary or any "rack" at the lower portion of the
loop formed by the cord, where, in lieu thereof, a double or other "eye," or other
simple steadying equivalent, may be employed.
"
"
To prevent the plain or back end or pivot of the roller from "jerking out" of
its bracket, we construct the hole for the pivot, with a curved or "overhanging'
top, so that, whilst admitting proper or intentional removal, its safety for duty
will be secured.

page_text: We EDWIN VERITY and JOSHUA MARLAND VERITY of Call Lane, Leeds, Iron-
mongers and BENJAMIN BANKS of Meadow Lane Leeds Brass worker; all in the
County of York do hereby declare the nature of our said Invention for AN
IMPROVED 'DOUBLE CORD
ACTION FOR BLIND OR. MAP ROLLERS AND OTHER
SIMILAR PURPOSES and in what manner the same is to be performed, .to be
particularly described and ascertained in and by the following statement -
"
رو
This invention has for its object the production of a simplied but efficient and
reliable "double cord" action for raising and lowering window blinds, maps and
other similar articles, and it may be thus described.
The system or principle upon which our action is based and constructed is that of
sustaining or preventing the running down of the blind or other article by means of
a frictional "grip" or " brake" action and this produced or obtained automatically by
and from the weight of the blind or other article, and the roller and its furniture;
and in carrying it into effect we take the ordinary wooden or other roller, and we fit
the ends with metal "furniture or fittings, similar in their general features to
those used with the double cord action and "rack" but constructed to act in such
a manner in conjunction and combination with the supporting brackets as not to
require the latter" the rack " -as hereinafter explained.
11
"
The before named frictional "grip" or sustaining power is obtained by the use
of a wedge or wedging action, arranged to act upon; or in. connection with either
the bearing pivot, or the cord pulley or both, as circumstances may require; in the
former instance by a fixed wedge expanding the pivot which is enlarged and "split
for that purpose, and in the other or latter by the pivot or a block upon it, constituting
one side of the wedge, and the pulley, or a side rib or flange upon it, the other side;
and these acting in a similar manner to the former, that is upon sloping or wedging
surfaces, will cause the weight to produce the wedging and grip and thus sustain
or prevent the roller from revolving, the downward or unrolling way, whilst
allowing perfect freedom of action when eased, or relieved of the weight, and it
will be evident that in both cases or arrangements the amount of grip or sustaining
power will depend mainly upon the angle of the wedge or wedging surfaces and
we therefore sometimes render this adjustable by altering the said angle to suit
the various sizes and weights of blinds and other articles as circumstances may
require.
"
We now fit upon the upper part of the inside face of the same main or pulley
end bracket, before referred to, a pair of small deep grooved pullies or "dummy'
equivalents, placed above the main pulley and at about 45 degrees on each side of
the vertical centre line of it and its pivot, and so that the cord when passed under
the main pulley and over each of these shall "clip" or be in contact with about
three fourths of the circumference of the "milled" groove in the said main pulley.
and thence passing down as a loop being "endless" or "double," the pulling of

page_text: either the front or the back portion of the cord anywhere below the said small
pulleys or their equivalent will first lift the main pulley and roller and free them
from the wedging "brake" or sustaining grip or action, and then either raise or
lower the blind or other article as desired (according to whether the front or the
back cord is pulled) and when loosed, will allow the roller and pulley to fall again
into the wedging or gripping "position for supporting the blind and preventing
"running down or unrolling and this, without the use of or the necessity for, the.
ordinary or any "rack" at the lower portion of the loop formed by the cord where,
in lieu thereof, a double or other "eye". or other simple steadying equivalent may
be employed.
'
°
"
To prevent the plain or back end or pivot of the roller from jerking out of its
bracket we construct the hole for the pivot with a curved or "over hanging
top, so that whilst admitting proper or intentional removal its safety for duty will
be secured.
And in order that our said invention may be particularly described and
ascertained reference is hereby made to the accompanying drawings in which
similar letters of reference indicate corresponding parts.
Fig. 1 is an elevation of the furniture as fitted at the pulley end of the roller,
but with the roller removed.
Fig. 2 is a perspective view of the bracket.
Fig. 3 is a side view of the same.
Fig. 4 is an elevation shewing a slight variation in construction.
Fig. 5 is an elevation of our improved back end support.
Figs. 6, 7, 8 & 9 shew another arrangement of wedge action.
Figs. 10 and 11 shew our system of manufacturing pulley wheels for the cords to
work in.
In Figs. 1. 2. 3 and 4 a is the wainscot or frame (in section) to which the bracket
is attached by screws, b is the bracket, c is the cord which passes over two
"dummy" pulleys d d; these pullies or their equivalents are usually made of
porcelain, 'e is the blind pulley round a portion of which the cord is passed, as shewn
in Fig. 1.
In order to prevent the cord from being jerked out of its place, the two curved,
overhanging guards f, f, f¹, f¹, are provided, under which the cord is readily placed
when fixing the blind in position.
In Fig. 2 the bracket is shewn in perspective without the roller pulley. The
slot g receives the pin h of the pulley and permits it (and also the roller) to rise
and fall therein a certain distance, when the pulley is down, as seen in Fig. 1 the
edge of the pulley is in contact with the brake block i-This brake block is fixed
at a suitable angle to ensure sufficient friction to act as a brake, and arrest the
downward motion of the blind.
This brake block is usually cast in one with the bracket, and therefore fixed:
but in some cases it is pivoted and fitted with an adjusting screw, so that the angle
of incidence may be altered.
In some cases the slot'g is fitted with a slide, as shewn at g³ Fig. 4, to carry the
pin h.
The bracket is also made either with "face" screws, as shewn in Fig. 1 or with
"end" screws, as shewn in Fig. 4.
Fig. 5 shews the construction of the support for the pivot at the left, or back
end of the roller, the curved slot preventing the pin from being accidentally
jerked out of the support but admitting of intentional removal with facility.
Figs. 6, 7, 8 and 9 illustrate the other arrangement, hereinbefore referred to,
whereby the friction to prevent the running down of the blind, is obtained by a
split pivot with diagonal lugs-Fig. 6 shews the pulley e fitted with the split
pivot m having diagonal lugs or feathers n n-Fig. 7 is a separate view of the
split pivot and Fig. 8 is a section on the line 1. 2 of Fig. 7. Fig. 9 shews the form
of bracket. for this pivot to work in. The feathers nn are inserted in the diagonal
+

page_text: slots gg-When the pulley is down the slots expand the pivot in the pulley, and
cause sufficient friction to prevent the blind running down.
In Figs. 10 and 11 our improved method of forming blind pullies is shewn. One
half is made with a square boss o which is fitted into a square hole p in the other
half of the pulley, and rivetted together.
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. The method of mounting blind and other rollers, whereby the weight of the
article suspended is utilized to prevent the same from running down, substantially
as and for the purposes herein before described and shewn on the drawings.
2. The manufacture and use of furniture for Sitting blinds, map and other rollers
operating by means of the wedge actions and brake blocks substantially as and for
the purposes hereinbefore described and shewn on the drawings.
3. The general construction, combination and arrangements of the several and
respective parts together forming our improved double or endless cord action for
blind or map rollers and other similar purposes substantially as herein before
described and shewn on the drawings.