IMPROVEMENTS IN RACK-PULLEYS FOR WINDOW-BLIND-CORDS
Year: 1885

page_text: "
I, RICHARD BROWN EVERED, of 28 Drury Lane, in the County of Middlesex,
Brass-Founder do hereby declare the nature of my invention for "IMPROVEMENTS
IN RACK-PULLEYS FOR WINDOW-BLIND-CORDS and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
My invention relates to rack-pulleys for the cords of window-blinds, and com-
prises the improvements hereinafter described.
In most of the rack-pulleys heretofore constructed, the pulley-carrier is capable
of downward movement, but is prevented from rising by a spring engaging with
the teeth of the rack. Instead, therefore, of the said pulley-carrier being raised,
when it is required to occupy a higher position in the rack, it must first be removed
from between its guides at the lower end of the rack and then be re-inserted at
the upper end thereof, and moved downward to the desired position.
I am aware that attempts have been made to overcome this objection, but the
racks used, in these cases, require to be first stamped from sheet metal and then
bent at their edges to form the guides for the pulley-carrier, or to be cast in separate
pieces which are afterwards united by rivetting or otherwise. By my invention
I provide in a very simple and efficient manner for the adjustment of the pulley-
carrier either up or down in the rack, so that the cord can be either slackened or
tightened, as desired; moreover, my rack can be either cast in one piece or it can
be conveniently formed from sheet metal at one operation by pressure between
suitable dies, and will then require no subsequent bending to form the guides. By
my invention, therefore, I diminish the cost of manufacture and provide a rack-
pulley which is simpler in construction than those heretofore used.
My improved rack-pulley is illustrated in the accompanying drawing, in which
Figure 1 is a front elevation, and
Figure 2 a section on the line x, x, Figure 1.
Figure 3 is a central vertical section of the pulley-carrier.
a is the rack, the teeth of which are formed on the rear side thereof as shewn
at a
This rack consists of a single flat plate or bar bent at each end to form
lugs a², a³, whereby it may be secured in place, and formed with a slot a³ to receive
the pulley-carrier b, which is fitted to slide up and down in the said slot. The
said rack can, as above stated, be conveniently made from sheet-metal by pressure
between suitable dies. c is the pulley, which is fitted to rotate upon a tubular

page_text: projection 61 on the carrier b. d is a spring attached to the carrier b and so formed
and arranged that its upper extremity will engage with the teeth of the rack a.
e is a pin or rod, which is passed through the tubular projection b¹, and is secured
by rivetting or otherwise to the spring & at, or near, its upper end. A push-knob
orbutton is attached to the outer end of this pin or rod.
By pressing slightly upon the push-knob f, the spring dis disengaged from the
rack-teeth a' and the pulley c and carrier b can be moved either up or down in the
slot a immediately the said push-knob is released, the said pulley and carrier
will be held in position by the engagement of the spring & with one or other of
the said rack-teeth.
It is not necessary that the pin or rode should be secured to the spring d; it
may, if desired, merely press on the end thereof.
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 improved rack-pulley constructed substantially as described and as illustrated
in the accompanying drawing, for the purpose specified.
HASELTINE, LAKE & Co.,
For the Applicant.