Improvements in Fanlight, Skylight, and Casement Openers.
Year: 1899

page_text: Date of Application, 3rd July, 1899
Complete Specification Left, 3rd Apr, 1900-Accepted, 5th May, 1900
PROVISIONAL SPECIFICATION.
Improvements in Fanlight, Skylight, and Casement Openers.
I, CHARLES FITCHETT GRAY, of Exeter Street, in the City of Birmingham, Brass
Founder, do hereby declare the nature of this invention to be as follows:-
This invention relates to that description of fanlight, skylight, and casement
openers and the like in which a direct action is obtained between the stay bar and
the block forming the pulley and screw, which block is actuated by a cord for opening
and closing the lights; the principle of which is described in the Specification of
Patent No. 2251 dated the 31st day of January 1896.
Hitherto the pulley and screw block has been formed with a single spiral worm or
thread to work, into the teeth on the stay bar, but in practice this is found very
liable to bind and become inactive. "
,
My improvements consist in forming upon the pulley and screw 'block two, three,
or more spiral worms or threads parallel to one another round the circumference of
the block, which block is grooved for the cord in the usual manner, or instead, has a
separate pulley working in conjunction with it.
The teeth upon the stay bar are set-off at the correct angle to follow the spiral
worms on the block when the latter is revolved by means of the cord or other
arrangement.
By the employment of two, or preferably three spiral threads or worms upon or in
conjunction with the pulley all binding is avoided when the several parts are
properly adjusted, and a much quicker action for opening and closing the lights is
obtained.
The pulley and screw block may be arranged to work either at the side or under-
neath the stay bar, either position being preferable to above the stay bar, the teeth
upon the stay bar being on the side or underneath to suit such positions.
Improvements in Fanlight, Skylight, and Casement Openers.
I, CHARLES FITCHETT GRAY, of Exeter Street, in the City of Birmingham, Brass-
founder, 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 relates to that description of fanlight, skylight, and casement
openers and the like in which a direct action is obtained between the stay bar and
the block forming the combined pulley and screw, which block is actuated by a cord

page_text: for opening and closing the lights. And the improvements relate particularly to the
construction of the screw block.
Hitherto the screw blook has been formed with a single spiral worm or thread to
work into the teeth on the stay bar, but in practice this is found very liable to bind
and become inactive.
My improved combined pulley and screw block consists of a block grooved at one
end for the cord in the usual manner and upon the other portion of the block are
two, three, or more spiral worms or threads parallel to one another round the
circumference of the block; instead of the usual single continuous spiral thread. Or
the block may be made in two pieces, one for the pulley and the other for the screw
threads and be joined to work in conjunction, with one another.
The teeth upon the stay bar are set off at the correct angle to follow the spiral
worms on the block when the latter is revolved by means of the cord.
Referring to the accompanying sheet of drawings upon which the similar letters of
reference on the several figures relate to similar parts.
1
Fig. represents one of my improved fanlight openers.
Fig. 2 is a plan of the block at the pulley end shewing the screw threads.
Fig. 3 is a plan of a portion of the underside of the stay bars shewing the angle at
which the teeth are set to suit the angle of the screw threads.
(á) is a bracket carrying the revolving block (6) one end of which is grooved at (e) 2
to form a pulley for the cord (d) which is passed through the guide piece (1) hung.
from the bracket (a). Upon the block (b) are three spiral threads or worms (e,f,g)
shewn also on plan in Fig. 3. (h) is a stay bar passed through a guide (1) forming,
a bridge to the bracket or block carrier (a) so that the spiral threads or worms (e,f,g)
will engage in the teeth (k, k, k) on the stay bar (h) so that pulling the cord (d) will 2
cause the threads (e,f,g) to travel along the rack teeth (k, k, k) and open or close the
fanlight.
By the employment of two, three or more spiral threads (e, f, g) they are enabled
to be formed upon the block at a less acute angle to the stay bar than can be obtained
by the use of a single thread and are therefore less liable to bind; the teeth (k, k, k) 3
being formed on the stay bar as shewn in Fig. 3 at an angle. to correspond with the
angle of the spiral threads.
A further advantage in forming the block with more than a single spiral worm or
thread is that the action of the opener is quickened.
The fanlight opener is shewn in the drawings with the block working into teeth 3
on the underside of the stay bar, this being the preferable arrangement, but the
parts may be so arranged as to allow of the block working into teeth on the side, or
on the upper face of the stay bar.
The several parts may be varied in their form and arrangement to suit the various
positions in which they may be required to be used for fanlights, skylights, or 4
casements.
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
"
In fanlight, skylight, and casement openers in which a direct action is obtained 4
between the stav har and block upon which are the willa's and