Year: 1887

page_text: Date of Application, 11th Aug., 1887
Complete Left, 9th May, 1888
Complete Accepted, 15th June, 1888
I JOHN MITCHELL of 32 St. Martin's Lane in the City of Westminster, Blind
Maker, do hereby declare the nature of this invention to be as follows:-
:-
In spring roller as heretofore made, it has been usual to adapt a central cord to
the blind for the purpose of pulling it down when required, and also to enable the
person raising the blind to regulate the speed at which it is wound up, or to arrest it
any desired height.
at
This central cord is however objectionable, more especially in the case of casement-
windows, as it hangs in the middle of the window space, and in the way of passers in
and out, and to obviate this inconvenience, it has been proposed to have a cord at
either end of the roller, one to unlock the retaining pin, and the other to regulate the
movement of the blind. This arrangement has also its inconveniences, more
particularly in the case of wide blinds, and it is the object of the present invention to
overcome these inconveniences and objections, and to provide a spring roller blind,
the movement of which can be regulated, and the unlocking of the retaining mechanism
effected, by one and the same cord.
In carrying out my invention, I employ a spring roller of the usual construction,
and to one end thereof I adapt a pulley, one side of which (preferably the outer side)
is formed with ratchet teeth.
Into these teeth takes a curved pawl, which is suitably pivotted above the roller, and
is formed with a curved extension having at the end an eye through which passes the
blind cord. The position of the eye with regard to the pulley to which the
cord is attached, is such, that when the cord is lightly pulled, the pawl will be
withdrawn from the ratchet, and the blind will be free to rise under the influence
of the spring.
The cord is arranged to wind up with the blind, and it will therefore be evident
that the upward movement of the blind can be readily regulated by letting the cord
slide gently through the fingers.
To let or pull down the blind, it will be only necessary to pull firmly on the cord,
which will thereby be unwound, at the same time unwinding the blind. When the
blind is in the desired position, the pawl will be allowed to fall into a tooth of the
ratchet, by suddenly slackening the cord, and thus the blind will be retained in that
position.
1 19 •
1
2

page_text: I, JOHN MITCHELL of 32 St. Martin's Lane in the City of Westminster, Blind
Maker, 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 :-
In spring roller blinds as heretofore made, it has been usual to adapt a central cord 5
to the blind for the purpose of pulling it down when required, and also to enable the
person raising the blind to regulate the speed at which it is wound up, or to arrest it
at desired height.
any
This central cord is however objectionable, more especially in the case of casement
windows, as it hangs in the middle of the window space, and in the way of passers
in and out, and to obviate this inconvenience, it has been proposed to have a cord at
either end of the roller, one to unlock the retaining pin, and the other to regulate the
movement of the blind. This arrangement has also its inconveniences, more
particularly in the case of wide blinds, and it is the object of the present invention to
overcome these inconveniences and objections, and to provide a spring roller blind, the
movement of which can be regulated, and the unlocking of the retaining mechanism
effected by one and the same cord.
In carrying out my invention, I employ a spring roller of the usual construction,
and to one end thereof I adapt a pulley, one side of which (preferably the outer side)
is formed with ratchet teeth.
Into these teeth takes a curved pawl, which is suitably pivotted above the roller,
and is formed with a curved extension having at the end an eye through which
passes the blind cord. The position of the eye with regard to the pulley to which
the cord is attached, is such, that when the cord is lightly pulled, the pawl will be
withdrawn from the ratchet, and the blind will be free to rise under the influence of
the spring.
In the accompanying drawing,
Fig. 1 is a front view of a blind and spring roller with my invention adapted
thereto.
Fig. 2 is a side view of the same.
A is the blind and B the spring roller. C is a pulley on the roller, one side
or flange of which is formed with ratchet teeth C, and D is the blind cord.
The roller is set with the blind rolled up, and the cord will be wound up on the
pulley.
E is a pawl which is pivotted above the roller at E¹, or in any other convenient.
position, and it is provided with a curved extension piece E³, formed with an eye
through which the blind cord is passed.
On referring to Fig. 2, it will be seen that if the cord be lightly pulled to the left,
it will throw the pawl out of gear, and the roller will be free to turn in either
direction.

page_text: The blind will be lowered by pulling firmly on the cord, and will be raised by the
spring, the cord being allowed to slip quietly through the fingers, care being
taken to retain the tension on the cord, that the pawl may be held out of gear. In
this manner the speed at which the blind is raised can be regulated by the cord.
When the blind is raised the required height, the pawl will be allowed to fall into
gear with the ratchet, by suddenly slackening the cord. 1 would here remark that my
invention applies only to spring roller blinds.-
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 :-
1st. The improvements in spring roller blinds herein shown and described,
whereby one cord is made to serve to unroll the blind, unlock the catch, and
regulate the speed at which the blind is to be raised, as set forth.
2nd. In a spring roller blind, the combination with a single cord adapted to unroll
the blind and to regulate the speed at which the blind is to be raised, of a swinging
catch or
locking mechanism provided with an eye through which the cord is passed,
and so arranged with respect to the roller that on tension being applied to the cord,
the locking mechanism will be released, as set forth.
NEWTON & SON,
Agents for the Applicant.