Year: 1886

page_text: I, JOHN PULLAR, of Dundee in the County of Forfar, North Britain, Blindmaker
and Bellhanger, 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, and accompanying drawing, (that is to say) :-
My invention relates to apparatus used for the purpose of opening and closing
hinged or pivotted windows, ventilators, and other articles of the like kind; and it
has for its object novel methods of constructing and arranging such apparatus so
that the window or article to be moved, is readily and easily adjusted to any
desired position, and remains firmly fixed in such position until it is required again
to re-adjust it.
The accompanying drawing is in illustration of my invention, Figure 1 being a
side view and figure 2 a front view of a window hinged to a window frame at its
lower edge and having my improved apparatus applied to it.
The same letters of reference indicate the same parts in both figures.
a is an endless screw or worm, turning freely upon a spindle or bearing formed
or fixed upon a plate or bracket h which is screwed or otherwise fixed to the side
of the window frame. This screw a gears with a tangent toothed wheel d fixed
upon a spindle or axis which turns in bearings also formed or fixed upon the
bracket h. Upon the end of the spindle or axis is formed or fixed an arm cof
suitable length and strength, the outer end of which is cranked or turned outward
so as to fit in a slot f in a bracket screwed to the side of the moveable window
frame g, which is shewn broken off and hinged to the lower side of the window
frame at i. A pulley of any desired size is fixed or formed upon the endless
screw a and is provided with an endless or other cord k the other end of which is
brought to a convenient position so that by it the pulley b and the endless screw a
can be turned in either direction as desired, and the wheel d is thus also turned in
either direction and the bar c is raised or lowered round the axis of the toothed
wheel d. The outer cranked end of the bar c as it rises or falls moves in the slot f
aud carries the latter with it, turning the window frame or sash g round its hinges
or pivots i and opening or closing it as desired. The dotted lines in figure 1 shew
the window frame g closed.

page_text: When force ceases to be applied to the cord k in either direction the frame or
sash g remains fixed in the position to which it is adjusted, from which it cannot be
moved until the cord k is again pulled in either direction.
A spring of india rubber or other suitable material, may be arranged between
the window sash g and the moveable frame, so as to balance or partly balance
the weight of the latter, or a weight may be used for the same purpose, and the
movement of the sash is thus rendered more easy and steady.
When the apparatus is fixed at the side of the window as shewn, light passing
through the latter is not obstructed, but it may be fixed in any other position
where more convenient.
I do not confine myself to the precise form and details, and relative proportions
of the several parts of the apparatus, which may be varied more or less to suit the
circumstances in which it is to be used, but 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
The combination of the lever arm c, the slotted bracket f, the endless screw a
and toothed tangent wheel d or their equivalents, and the pulley b and cord k, all
arranged and operating substantially as and for the purpose described and shewn
in the drawing.