An Improved Automatic or Self-adjusting Window Blind Cord Pulley-block or Holder.
Year: 1895

page_text: Date of Application, 18th June, 1895
Complete Specification Left, 7th Mar., 1896-Accepted, 18th Apr., 1896
PROVISIONAL SPECIFICATION.
An Improved Automatic or Self-adjusting Window Blind Cord
Pulley-block or Holder.
I JOHN HUNT of Baldwin Street Iron Works, Derby Street, Bolton, in the
County of Lancaster, Machine Maker, do hereby declare the nature of this
invention to be as follows:-
In roller window blinds, the roller cord passes under a pulley usually carried in
an adjustable holder or block which can be moved up or down according as the
cord tightens or slackens under atmospheric or other conditions. Such cords
being very susceptible to atmospheric changes as well as stretching from use,
the pulley holder requires to be adjusted frequently and is a source of trouble and
inconvenience. According to my invention I mount the pulley in a holder or
block which is held by a spring against the pull of the cord.
The methods of mounting and supporting the said elastic pulley block might
vary and the spring might either be a spiral or flat spring. The pulley thus
exercises an elastic pressure upon the cord and as the cord lengthens or shortens
from whatever cause, the pulley either yields to the increased tension of the cord
or takes up any slack which may arise so that the cord is automatically maintained
at practically the same tension.
Dated this 17th day of June 1895,
EDMUND CHADWICK, F.I.C.P.A.,
Agent.
An Improved Automatic or Self-adjusting Window Blind Cord
Pulley-block or Holder.
I, JOHN HUNT of Baldwin Strect Iron Works, Derby Street, Bolton, in the
County of Lancaster, Machine Maker, do hereby declare the nature of my said
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
In roller blinds, the roller passes under a pulley usually carried in an adjustable
holder or block which can be moved up or down according as the cord tightens or
slackens under atmospheric or other conditions. Such cords being very susceptible
to atmospheric changes as well as stretching from use, the pulley holder requires to
be adjusted frequently and is a source of trouble and inconvenience. According
to my invention I mount the pulley in a holder or block which is held by a spring
against the pull of the cord.
The methods of mounting and supporting the said elastic pulley block might
vary and the spring might either be a spiral or flat spring. The pulley thus
exercises an elastic pressure upon the cord and as the cord lengthens or shortens
from whatever cause, the pulley either yields to the increased tension of the cord
or takes up any slack which may arise so that the cord is automatically maintained
at practically the same tension.

page_text: DESCRIPTION OF DRAWINGS.
Fig. 1 is a front view of my improved automatic or self-adjusting window blind
cord or pulley block or holder, and Fig. 2 a side view of same.
A is the roller for carrying the window blind; B the cord pulley; C the centre,
and D the lower cord pulley. In roller blinds the roller or cord pulley D is
carried in the adjustable holder or block F which can be moved up or down as the
cord G tightens or slackens under atmospheric or other conditions. The cord G is
very susceptible to atmospheric changes as well as stretching from use, consequently
the pulley holder or block F requires to be adjusted frequently and is a source of
trouble and inconvenience. According to my invention I mount the cord pulley D
in the holder or block F which is held by the spring I against the pull of the
cord G. The spring I may be a spiral as shown or a flat spring if desired. The
pulley D exercises au elastic pressure upon the cord G and as the latter lengthens
or shortens from whatever cause the pulley D either yields to the increased tension
of the cord or takes up any slack which may arise so that the cord G is practically
the same tension. The holder or block F is mounted in the fixing W and secured
by the screw M in any desired position according to the length of the cord G.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
In combination with roller blinds the use of the adjustable holder or pulley
block D mounted in the holder F and provided with the spiral or other spring I
substantially as described and for the purpose specified.
Dated the 6th day of March 1896.
EDMUND CHADWICK, F.I.C.P.A.,
Agent.