Year: 1888

page_text: We, JAMES MCHESNEY, Builder and ARTHUR THOMAS WARNER COBHAM Cabinet
Maker both of Marton in the Colony of New Zealand 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 :—
Our Invention relates to an improved Sash Balance and has for its objects more
especially raising, and lowering the sashes of ordinary windows and shutters of similar
construction in a simple and effectual manner.
In order that our Invention may be most easily understood, we will now proceed to
describe the same, and for that purpose shall refer to the accompanying sheet of
drawings in which similar letters of reference indicate corresponding parts in all the
figures.
Fig. 1 is a longitudinal section of part of a window with our improved balance
attached.
Fig. 2 is a side elevation of the spring box
Fig. 3 is a front elevation of the same.
Fig. 4 is a sectional view of the same.
a. a. is the stile of an ordinary window.
b. b. is the stile of the sash.
c. is the head of the sash.
d. is the spring box.
e. is a pulley revolving within the spring box, d. on the pin e¹.
f. is a spring fastened at one end to the pin e¹ and at the other end to the
inside of the pulley e.
g. is a band cord or chain fastened at one end firmly to the pulley e at g' then
wound round the outside of the pulley e and fastened to the sliding sash at g.
The stile of the sash is grooved out at to form a recess for the band or
cord g.
It will be evident from this description of the several parts that when the sash is
owered the band or cord g being attached to it will draw down and cause the pulley e
d. is the spring box.
e. is a pulley revolving within the spring box, d. on the pin e¹.
f. is a spring fastened at one end to the pin e¹ and at the other end to the
inside of the pulley e.
g. is a band cord or chain fastened at one end firmly to the pulley e at 7' then
wound round the outside of the pulley e and fastened to the sliding sash at g.
The stile of the sash is grooved out at to form a recess for the band or
cord g
It will be evident from this description of the several parts that when the sash is
owered the band or cord g being attached to it will draw down and cause the pulley e

page_text: to revolve and thus wind up the spring, f. and on the sash being raised the spring, f.
will recoil and assist in lifting the weight of the sash, And if the spring be of suitable
strength the sash will rise or fall with a very small amount of pressure its weight
being nearly counterbalanced by means of the spring. The spring therefore forms a
substitute for the ordinary sash weight.
It is possible to fix the spring box d with its spring and cord in the sash and attach
the band or cord g to the pulley stile, but we prefer for general purposes the
arrangement as shewn. By the use of our improved apparatus the ordinary sash
weights are dispensed with, it is unnecessary to cut pocket pieces or remove the
architraves of a window for repairs, and the raising and lowering of the sash are
comparatively noiseless. It is also a very simple arrangement for export and transport
the whole being finished in the manufactory ready for fixing.
Having now described and particularly ascertained the nature of our Invention we
wish it to be understood that we do not confine ourselves to the exact form and size
of spring for this can be varied to suit the circumstances and the sash line can be of
cord or tape, of metal or other suitable fabric, but what we claim as novel and
useful is :
The combination of a sash cord or tape with spring and pulley and spring box,
substantially as described herein and illustrated in the accompanying drawing.
Dated this 20th day of July 1888.
JAMES MCCHESNEY.
ARTHUR THOMAS WARNER COBHAM.