CERTAIN IMPROVEMENTS IN RACK PULLEYS
Year: 1878

page_text: LETTERS PATENT to Thomas Dutson, of Birmingham, in the County of
Warwick, Manufacturer, for the Invention of "CERTAIN IMPROVEMENTS IN
RACK PULLEYS."
Sealed the 30th August 1878, and dated the 4th March 1878.
PROVISIONAL SPECIFICATION left by the said Thomas Dutson at the Office
of the Commissioners of Patents on the 4th March 1878.
THOMAS DUTSON, of Birmingham, in the County of Warwick, Manufacturer.
"CERTAIN IMPROVEMENTS IN RACK PULLEYS."
My Invention consists of the improvements herein-after described in the con-
struction of rack pulleys as applied to the casement of windows, and has for its
object the raising and lowering of window blinds, and such like analagous
purposes.
Firstly. I construct the back or base plate of sheet metal, by preference of any
desired form or outline, according to my requirment, and this is effected by the
employment of tools. At the ends or in close proximity thereto I slot or pierce in
Thus I construct standards or
form U; the inner and remaining parts I raise.
supports, and these carry intermediate a pillar or rod permanently secured at each
end. Upon the exterior of this said pillar is fed a spiral spring, and immediately
This
beneath is a sliding clip traversing the said pillar freely in either direction.
sliding clip has a spindle, upon which rotates the pulley wheel for carrying the blind
cord; at its extreme end is the rose or knob.
Secondly. I propose to construct the pulley wheel of china or other plastic
material, or I may adopt metal; in this case I should enamel the same.
Thirdly. The rose or knob I produce by stamping of any suitable design or
pattern, while the groundwork I ornament with various colours.
The advantages aimed at by this my said Invention are,--
Firstly. That a continuous tension is imparted to the blind cord, and not requiring

page_text: that readjusting as hitherto has been by the olden method, that it is more economical
and durable.
Secondly. The pulley wheels being of china or metal enamelled, cleanliness is
gained and more presentable, the same remarks applying to the rose or knob.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Thomas Dutson in the Great Seal Patent Office on the 4th Sep-
tember 1878.
THOMAS DUTSON, of Birmingham, in the County of Warwick, Manufacturer.
" CERTAIN IMPROVEMENTS IN RACK PULLEYS."
My Invention consists of the improvements herein-after described in the con-
struction of rack pulleys as applied to the casement of windows, and has for its
object the raising and lowering of window blinds, and such like analogous
purposes.
Firstly. I construct the back or base plate of sheet metal, by preference of any
desired form or outline, according to my requirement, and this is effected by the
employment of tools. At the ends or in close proximity thereto I slot or pierce in
form U; the inner and remaining parts I raise. Thus I construct standards or
supports, and these carry intermediate a pillar or rod permanently secured at each
end. Upon the exterior of this said pillar is fed a spiral spring, and immediately
beneath is a sliding clip traversing the said pillar freely in either direction. This.
sliding clip has a spindle, upon which rotates the pulley wheel for carrying the blind
cord; at its extreme end is the rose or knob.
Secondly. I propose to construct the pulley wheel of china or other plastic
material, or I may adopt metal; in this case I should enamel the same.
Thirdly. The rose or knob I produce by stamping of any suitable design or
pattern, while the groundwork I ornament with various colours.
The advantages aimed at by this Invention are,―
Firstly. That a continuous tension is imparted to the blind cord, and not requiring
that readjusting as hitherto as been by the old method, that it is more economical
and durable.
Secondly. The pulley wheels being of china or metal enamelled, cleanliness is
gained and more presentable, the same remarks applying to the rose or knob.
And in order that the said Invention may be fully understood, I shall now
proceed more particularly to describe the same, and for that purpose shall refer to
the Figures on the explanatory Sheet of Drawings hereunto annexed, and letters
marked thereon (that is to say),—
In Figure 1 of the accompanying Drawings A is a front view; B, a side view;
C, D, E, parts of the same detached." a is the base plate or back with the U shaped
slots, and these producing the standards or supports b, b, for carrying the pillar or
rod c, upon which is fed exteriorly the spiral spring d, composed of steel for its

page_text: durability.
e is a sliding clip with spindle carrying the pulley wheel ƒ for
receiving the blind cord, and at its extreme the knob or rose g. e traverses C, and
by the compressed action of d produces the required tension for the raising and
lowering of the blind.
In Figures 2, A is a front view; B, a side view partly sectional. a is the base
plate or back, having a circular front; C is the pillar or rod, with the spiral spring d
fed thereon; e is a frame traversing c, the form of which corresponds to the interior
of a, also carrying a spindle, pulley wheel, and knob, the principle or action being
identical to Figure 1, differing only by the circular front having for its purpose the
secreting of the said action.
Having now described and ascertained the nature of my said Invention, and the
manner in which the same is or may be performed, I would observe that I do not
limit myself to the precise details herein given, and shewn on the accompanying
Drawings, as various modifications may be made therein, while retaining the
essential features of my said Invention, but what I claim as new is,—
Firstly. The combination of the back plate a with the standards b, b, in an
entire piece, carrying the pillar c and the steel spiral spring d producing the required
tension.
Secondly. The construction of the pulley wheel ƒ in iron or suitable metal,
finished by the process of enamelling.
Thirdly. The producing of the rose or knob g in glass, china, or other plastic or
ductile material, in imitation of precious stones, and ornamented suitable to my
requirement by stamping, pressing, or embossing.
In witness whereof, I, the said Thomas Dutson, have hereunto set my hand
and seal, this Third day of September, in the year of our Lord One thousand
eight hundred and seventy-eight.
Witness,
THOMAS KENDRICK.
THOMAS DUTSON. (L.S.)