An Improved Friction Brake for Window Blind Rollers and other Objects.
Year: 1894

page_text: Date of Application, 7th Apr., 1894
Complete Specification Left, 7th Jan., 1895-Accepted, 6th Apr., 1895
PROVISIONAL SPECIFICATION.
An Improved Friction Brake for Window Blind Rollers and other
Objects.
We JOHN ROBINSON of 21 New Street Lancaster in the County of Lancaster
Mechanical Engineer and EDWARD JAMES THOMPSON, Draughtsman, Springbank,
Lancaster, do hereby declare the nature of this invention to be as follows:-
It relates to restraining and relaxing the restraint upon the revolution of rollers
and acts by friction brake.
Metal or wood may be used in the construction of the necessary parts.
Between the roller end or sheaf end (for use with or without cord) and end centre
pin is added a receptive circular "V" shaped groove.
To suspend the pin of the sheaf is used an ordinary bracket with an additional
perpendicular arm having a pin projecting at right angles upon which latter is to
work a terminating knuckle of a narrow semicircular plate.
The narrow semicircular plate is wider at the end nearer the terminating knuckle
and underneath the wider portion is fixed a "V" shaped insertion, so as to fall
correctly into the receptive circular "V" shaped groove; and at the other end of
this plate is a guide eye through which may run (if necessary) a cord.
When the plate is at rest the revolution of the roller is restrained by union
of "V" and "V" and when it is moved by cord or otherwise the union is dissolved
and restraint of revolution relaxed.
The receptive "V" shaped groove and the "V" insertion enable me to stay or
release a roller at any moment by friction brake and use the same (amongst other
things) for window blind rollers."
1
JOHN ROBINSON.
COMPLETE SPECIFICATION.
An Improved Friction Brake for Window Blind Rollers and other
Objects.
JOHN ROBINSON Mechanical Engineer 21 New Street Lancaster and EDWARD
JAMES THOMPSON Draughtsman, Springbank Lancaster 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 :-
This invention consists of a device to hold window blinds without use of spring
or ratchet wheels as commonly used & is shewn in the accompanying drawings
of which
COMPLETE SPECIFICATION.
An Improved Friction Brake for Window Blind Rollers and other
Objects.
JOHN ROBINSON Mechanical Engineer 21 New Street Lancaster and EDWARD
JAMES THOMPSON Draughtsman, Springbank Lancaster 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 :-
This invention consists of a device to hold window blinds without use of spring
or ratchet wheels as commonly used & is shewn in the accompanying drawings
of which
Fig. is a side elevation of roller cuu.
Fig. 2 is a sketch of break plate.
Fig. 3 sketch of bracket arm.
Fig. 4 side elevation of roller end resting on bracket with break plate in
position Fig. 5 and elevation of roller & side elevation of bracket arm & break
nlate

page_text: This invention is comprised of the V groove B formed by the addition of
flange H to an ordinary blind roller end and the V shaped piece A fixed on the
shaped brake plate M acting as a brake when allowed to fall into the groove B.
The V piece A is kept in position over the √ groove B, by the break plate M
being attached to the fixed bracket arm K with socket E hinging on pin D. The
blind can be let down or raised by cord coiling on drum N and passing through
hole C in plate M.
The wedge shaped brake A is raised by the cord when pulled slightly forward
acting upon plate M: when the plate M is at rest the revolution of the roller is
restrained by the friction of V piece A, acting in V groove B. and when the
V piece A is moved or raised by cord or otherwise the friction is taken away &
restraint of revolution relaxed.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
The suspension of a roller blind, map or other similar revolving object by friction
at any given point, by the application of a V shaped wedge or brake acting in a
V shaned groove.
JOHN ROBINSON,
21, New Street, Lancaster, Mechanical Engineer.
EDWARD JAMES THOMPSON,
Springbank, Lancaster, Draughtsman.