Year: 1895

page_text: Date of Application, 24th Oct., 1895
Complete Specification Left, 24th July, 1896-Accepted, 19th Sept., 1896
Music and Book Leaf Turner.
JOHN RICHARD EVANS 36 Arklow Street Dublin County Dublin Ireland
Mechanical Engineer do hereby declare the nature of this invention to be as
follows:-
A contrivance consisting of two air chambers to which are attached rubber
tubes, the other ends of the rubber tubes are attached to two cylinders for
reversable motion. The cylinders are provided with pistons and rods which are
connected to a toothed rack which engages with pinions attached to cylindrical
shafts; these shafts being telescoped into each other. The whole being supported
by a light metal frame. Attached to these telescoped shafts are arms of various
lengths which ends in forks turned at right angles the prongs of which are jointed
so as to admit of the easy adjustment of the paper between the prongs. The air
chambers being compressed the air is thereby forced through the tubes to the
cylinders thus forcing the pistons and rods, which draw the toothed rack backwards
and forwards as required. Upon the strength of pressure placed upon the air
chambers depends the slowness or quickness by which the leaves are turned. Thus
giving the reader the advantage of moving his reading at will without the aid of
hands or mouth. When one air chamber is constantly pressed to the movement
of the entire length of the toothed rack a vacuum is caused in that chamber, and
the then movement of the toothed rack fills the vacuum of the other chamber.
The opposite motion caused by pressure on the second air chamber now moves the
toothed rack in the opposite direction to the former, thus turning the leaf or leaves
the reverse way and filling the vacuum caused by the first motion of the toothed
rack. Thus for the working of the machine nothing is required but the compression
of the air in the air chambers, and it is above seen that the air supply is constant
owing to the reversable motion self filling the vacuum caused.
Dated this 22nd day of October 1895.
JOHN RICHARD EVANS.
Music and Book Leaf Turner.
I JOHN RICHARD EVANS, of 36 Arklow Street, Dublin, in the County of
Dublin, Ireland, Mechanical Engineer 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 :-
The contrivance
This invention relates to an improved music or book leaf turner.
consists of two air chambers, to which are attached rubber tubes. The other ends
of the rubber tubes are attached to two cylinders, for reversible motion. These
cylinders are provided with pistons and rods, which are connected to a toothed
rack, which engages with pinions attached to cylindrical shafts, these shafts being
telescoped into each other. The whole is supported by a light metal frame.
Attached to these telescoped shafts are arms of various lengths, which end in forks,

page_text: turned at right angles, the prongs of which are jointed, so as to admit of the easy
adjustment of the paper between them.
And in order that my said invention may be more clearly understood, I will now
proceed to describe the same with reference to the sheet of drawings accompanying
this specification, in which Fig. 1 is an elevation of the apparatus and Fig. 2 a
detail hereinafter referred to.
The same letters of reference are employed to denote the same parts in both the
views.
e,
a, a' shew air chambers, with pedals 6, 61, for compressing, c, c² shew cylinders,
each connected to an air chamber, by an india rubber tube d, or d¹. e, el are piston
rods, each connected to a piston, working in the corresponding cylinder, the
rods e are both connected to a plate f, capable of being slid along the back
plate f, and carrying three short racks g, h and i. k,l and m are three pinions, of
which is carried on the spindle n, on the spindle o and m on the spindle p.
The spindles n, o and p revolve independently of each other. q, rands are
rods attached to the spindles n, o and p respectively. To the horizontal rods q, r
and s are attached vertical forks rods t, u, v respectively.
Fig. 2 shews in side view the shape of a forked rod t. Suitable spring joints are
provided, at w, x, y; z is a rod attached to the frame-work of the apparatus, and
provided with clips 2 and 3, for holding the book or music in position. 4, 4 are
stops to the rods q, r, 8.
The action is as follows:-
The air chambers being compressed, the air is thereby forced through the tubes
to the cylinders, thus forcing the pistons and rods, which draw the toothed rack
backwards and forwards as required. Upon the strength of the pressure placed on
the air chambers, depends the slowness or quickness by which the leaves are turned,
thus giving the reader the advantage of moving his reading at will without the aid
of the bands.
When one air chamber is constantly pressed, until the rack has moved, as far as
it can in one direction, a vacuum is caused in that chamber and the then movement
of the toothed rack fills the vacuum of the other air chamber the opposite motion
caused by the pressure on the second air chamber now moves the toothed rack in
the opposite direction to the former, thus turning the leaves the reverse way and
filling the vacuum caused in the first motion. Thus for the working of the machine
nothing is required but the compression of the air in the air chambers, and, as above
seen the air supply is constant, owing to the reversing action automatically filling
the vacuum caused.
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 :-
1. Music and book lenf turners, constructed and operated substantially as set
forth.
2. In music and book leaf turners, the combination of air chambers, cylinders,
pistons and rods, racks and pinions, spindles (acting independently of one
another) horizontal rods and forked pieces, all arranged and actuated substantially
as set forth.
Dated this Twenty-fourth day of July 1896
BROWNE & Co.,
9 Warwick Court, Gray's Inn, London, W.C., Agents for the Applicant.