Improvements in Apparatus for Holding up or Sustaining Sliding Window Sashes in any desired Position.
Year: 1890

page_text: Date of Application, 13th Aug., 1890
Complete Specification Left, 12th May, 1891-Accepted, 13th June, 1891
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Holding up or Sustaining Sliding
Window Sashes in any desired Position.
We, CHARLES HIGGIN MAXSTED, of Westholine, Lancaster, in the County of
Laucaster, Silk Spinner, and ANTHONY BELL, of 36, Derwent Road, in the same
town, Ironmonger, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object to provide apparatus for holding up or sustaining
in any desired position a sliding window sash (such for instance as is employed in
a railway or other carriage door), the said apparatus being arranged to admit of
the window sash being readily raised and lowered.
The apparatus we employ in carrying out our invention may be conveniently
arranged within the hollow cavity or casing into which the sliding sash drops or is
pressed down when the window is opened. A narrow strap (preferably of leather)
having its two ends secured to the lower rib of the sash is arranged to operate
after the manner of an endless belt, one part of the strap passing over a pulley or
drum placed at the upper end of the hollow cavity or casing. Near the bottoin
of the hollow cavity or casing is an oblong swing plate, movable in a vertical
plane, and pivotted near to one or other of its two upper corners upon a fixed pin
or pivot, the said swing plate carrying two pulleys one arranged near to but in a
position preferably below the pin or pivot (the said pulley being hereinafter
referred to as the cam "), and the other (hereinafter referred to as the pulley")
being arranged at the other or free end of the swing plate. The two lays of the
depending double strap are passed underneath the cam and the loop of the strap is
stretched over the pulley. A spiral spring is so arranged as to pull at the free end
of the swing plate and so hold it up in a nearly horizontal position and thus to
cause the tension of the double strap and the compression of its two lays against
each other upon the underside of the cam. Or, if preferred, the swing plate may
be held up by means of a counterpoise weight on an arm projecting beyond the
pivotted end of the plate.
The action of the apparatus as above described is as follows:-When the
pivotted swing plate is in its more or less horizontal position the double strap is by
the upward pull of the spiral spring tightly compressed against the underside of
the cam, the amount of friction or bite between the two parts of the strap being
such as to prevent the weight of the window sash from causing them to slide or
slip past each other. The outer part of the strap (which at the upper part of the
hollow cavity or casing passes over the pulley first hereinabove referred to)
sustains the weight of the window sash being thereby held taut and pulled tightly
against the inner part of the strap at its touching contact with the underside of
the cam.
When a downward pressure is exerted upon the sash sufficient to over-
come the upward pull of the spiral spring below the extra amount of pull upon the
outer strap will cause the swing plate to be pulled round on its pivot downwardly
irom its horizontal to a more or less vertical position whereupon the compression
of the two parts of the strap against the cam will be relieved and the two straps
will be at liberty to slide freely past each other in opposite directions until the
downward pressure on the sash is withdrawn whereupon the spiral spring will pull
the swing plate back again to its normal or horizontal position and the two parts
If on
of the strap will be again compressed under the cam or locked as before.
the other hand an upward or lifting pressure be exerted upon the sash the outer
part of the strap (being then relieved of the weight of the sash) will become slack
and so allow the inner part of the strap to slip or slide freely between the cam and

page_text: the outer strap thus permitting the sash to be raised until the upward or lifting
pressure is withdrawn when the weight of the sash again bearing upon the outer
part of the strap the double strap will be once more compressed under the cam or
locked and the sash again securely held up or sustained.
Dated this 13th day of August 1890.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Applicants' Agent.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Holding up or Sustaining Sliding
Window Sashes in any desired Position.
We, CHARLES HIGGIN MAXSTED, of Westholme, Lancaster, in the County of
Lancaster, Silk Spinner, and ANTHONY BELL, of 36 Derwent Road, in the saine
town, Ironmonger, 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 has for its object to provide apparatus for holding up or
sustaining in any desired position a sliding window sash (such for instance as is
employed in a railway or other carriage door), the said apparatus being arranged
to admit of the window sash being readily raised and lowered.
In order that the nature of our said invention may be the better understood
reference is made in the following description to the accompanying drawings in
which,
Fig. 1 illustrates in side view a method of applying our improved apparatus to
the window sash of a railway carriage door :
Fig. 2 is a side view to a larger scale of the lower portion of our said improved
apparatus and
Fig. 3 is a sectional plan view of the same apparatus taken at the line A-B of
Fig. 2.
The apparatus we employ in carrying out our said invention may be conveniently
arranged within the hollow cavity or well A (see Fig. 1) into which the sliding
sash B drops or is pressed down when the window is opened. A narrow strap or
belt (preferably of leather) having its two extremities secured to the lower
rib d of the sash B is arranged to operate after the manner of an endless belt,
one part of the strap passing over a pulley or solid round stud e placed at the
upper end of the hollow cavity or well A. Near the bottom of the well is an
oblong swing plate, movable in a vertical plane, and pivoted near to one of
its ends upon a fixed pin or pivot g, the swing plate f carrying two pulleys or
solid round studs one arranged near to but preferably upon the pin or pivot g
(the said pulley being hereinafter referred to as the "cam"), and the other
(hereinafter referred to as the "pulley") being arranged at the other or free end
of the swing plate The two lays c and 2 of the depending double strap are
passed underneath the cam and the loop of the strap encloses or is stretched
over the pulley i. A spiral spring is so arranged as to pull at the free end of
the swing plate f and so hold it up in a nearly horizontal position (see solid lines
in Fig. 2) and thus to cause the tension of the double strap and the compression
of its two lays cand c against each other upon the underside of the cam h. Or,
if preferred, the swing plate may be held up by means of a counterpoise weight on
an arm projecting beyond the pivoted end of the plate. C is a sheet metal
framing in which the swing plate f and the spring may be conveniently
mounted the said framing being provided with holes in suitable positions to allow
of its being fastened by means of screws to the woodwork in the interior of the
cavity or well A. k is a turned down lip (being a portion of the framing C)
which meets an upper plate 7 projecting inwardly from the upper edge of the

page_text: l
swing plate the lip answering in combination with the plate as a stop to
determine the upward movement of the swing plate f.
The action of the apparatus as above described is as follows:-
j
When the pivoted swing plate f is in its more or less horizontal position (see
solid lines of the plate fat Fig. 2) the double strap c' c² is by the upward pull of
the spiral spring tightly compressed against the underside of the cam h, the
amount of friction or bite between the two parts of the strap being such as to
prevent the weight of the window sash B from causing them to slide or slip past
cach other. The outer part of the strap (which at the upper part of the cavity
or well A passes over the pulley or stud e) sustains the weight of the sash B being
thereby held taut and pulled tightly against the inner part c¹ of the strap at its
touching contact with the underside of the cam (see Fig. 2). When a downward
pressure is exerted upon the sash B sufficient to overcome the upward pull of the
spiral spring the extra amount of pull upon the outer strap c' will cause the
swing plate to be pulled round on its pivot y downwardly from its horizontal to a
more or less vertical position (see broken lines indicating the altered position of
the plate at Fig. 2) whereupon the compression of or amount of bite between
the two straps and e² will be so much lessened or relieved that the two parts
of the strap will be free to slide past each other in opposite directions until the
downward pressure on the sash B is withdrawn whereupon the spiral spring will
pull the swing plate back again to its normal or nearly horizontal position and the
two parts of the strap will be again compressed under the cam or locked together
as before. If on the other hand an upward or lifting pressure be exerted upon the
sash B the outer part of the strap (being then relieved of the weight of the sash)
will become slack and so allow the inner part d' of the strap to slip or slide freely
between the cam and the outer strap (thus permitting the sash B to be raised
or pulled upwardly) until the upward or lifting pressure is withdrawn when the
weight of the sash B being again brought on the outer strap c² the two lays of the
strap will be once more compressed or squeezed together under the cam h and
the sash again securely held up or sustained.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what
we claim is :-
Apparatus for holding or sustaining sliding window sashes in any desired position
in which a strap attached at its two extremities to a sliding window sash and
arranged to operate after the manner of an endless belt substantially in the manner
specified is passed in double form under a cam or stud on the pivoted end of a
plate such as fand in single form round a second stud near or at the opposite end
of the said plate a spring or its equivalent being employed to hold up the said
plate against the weight of the window sash the said parts being arranged and
operating substantially as hereinabove described and shewn in the drawings.
Dated this 12th day of May 1891.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicants.