Improvements in or applicable to Phonographs.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in or applicable to Phonographs.
We, THE EDISON-BELL PHONOGRAPH CORPORATION, LIMITED, of Edison House,
Northumberland Avenue, in the County of Middlesex, and JOHN HAYTON GREENHILL,
of 37, New King Street, Belfast, in the County of Antrim, Ireland, Electrical Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention relates to recording and reproducing devices adapted for use in
phonographs, graphones and the like, and consists in certain improvements upon
devices designed for the same purposes and described in the specifications to Letters
Patent granted to George Edward Gouraud, No. 7794 of 1889, and to George Gatton
Melhuish Hardingham, No. 19,153 of 1889; the object of the present invention being
to render the machine simpler in operation.
In a phonograph constructed according to our improved method, the recording and
reproducing devices are so arranged that, when the machine is altered from the
recording to the reproducing position or vice versa, the recording point or the
reproducing point, as the case may be, assumes the position vacated by the other
point and rests upon the same spot on the surface of the phonogram cylinder.
It has hitherto been customary to mount the two points upon a lever common to
both. According to the present invention, a lever is provided for each point, so that
each may act separately and independently of the other.
The diaphragm is mounted in the usual manner, and the "cross-head" secured to its
centre. This "cross-head," instead of carrying one link, as usual, is provided with
two eyes, each of which receives one end of a link; the opposite ends of these links
engaging levers which project from the centre of the diaphragın. The fulera for these
levers are carried in the usual manner by studs which project from weights; whilst
the free ends of the said levers carry the recording and reproducing points respectively.
The weights are pivotally mounted, preferably upon the frame that holds the
diaphragm, and are respectively arranged to face opposite portions of the said
diaphragm. In order to modify the pressure of the point upon the wax,
the pivoted weights may project beyond the point at which they are attached to the
diaphragm frame.
In order to change from the recording to the reproducing position, or vice versa, the
whole device, or the main portions of it, is or are turned about its centre through
an angle of 180 degrees or thereabouts.
Dated th: 00th day of Im 1000

page_text: We, THE EDISON-BELL PHONOGRAPH CORPORATION, LIMITED, of Edison House,
Northumberland Avenue, in the County of Middlesex, and JOHN HAYTON GREENHILL,
of 37, New King Street, Belfast, in the County of Antrim, Ireland, Electrical 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:
This invention relates to recording and reproducing devices adapted for use in
Phonographs, Graphophones and the like, and consists in certain improvements upon
devices designed for the same purposes and described in the specifications to Letters
Patent granted to George Edward Gouraud, No. 7794 of 1889 and to George Gatton
Melhuish Hardingham, No. 19,153 of 1889; the object of the present invention being
to render the machine simpler in operation.
In a phonograph constructed according to our improved method, the recording and
reproducing devices are so arranged that, when the machine is altered from the
recording to the reproducing position or vice versa, the recording point, or the repro-
ducing point, as the case may be, assumes the position vacated by the other point and
rests upon the same spot on the surface of the phonogram cylinder.
It has hitherto been customary to mount the two points upon a lever common to
both. According to the present invention, a lever is provided for each point, so that
each may act separately and independently of the other.
In the accompanying drawings, Fig. 1 is a view of the under side of the recording
and reproducing devices fitted in the arm or holder in the usual manner. Figs. 2 and 3
are respectively a corresponding side view and a plan. Fig. 4 is a longitudinal
section the positions of the recording and reproducing points being reversed.
The diaphragm is mounted in the usual manner in the frame which in turn is
carried in a pivoted arm; the "cross-head" being secured to the centre of the
diaphragm. This "cross-head," instead of carrying one link, as usual, is provided
with two eyes a a, each of which receives one end of a link b bl; the opposite ends
of these links engaging levers cc' which project radially from the centre of the
diaphragm. The fulcra for these levers are carried in the usual manner by studs d d'
which project from weights e e¹; whilst the free ends of the said levers carry the
recording and reproducing points f f respectively. The weights e el are pivotally
mounted at gg, preferably upon the frame that holds the diaphragm, and are
respectively arranged to face or cover opposite portions of the said diaphragm. A
stop or stops h, secured to the diaphragmn frame, may be used to limit the fall of the
weights. In order to modify the pressure of the point upon the wax the pivoted
weights e e¹ may project beyond the point at which they are attached to the diaphragm
frame as shown at e².
In order to change from the recording to the reproducing position or vice versa, the
whole device, or the main portions of it, is or are turned about its centre through an
angle of 180 degrees or thereabouts. The diaphragm frame is held in the socket of
the arm or carrier by means of plates ii secured to the arm or carrier; the plates
entering a circumferential groove k in the said frame. This frame is also provided
with a lever or handle furnished with a projection l' adapted to engage with a stop il
carried by one of the plates i. A stop may be provided on each of these plates if
desired. In order to provide for the lateral adjustment of the reproducing point, the
carrier is provided with a stop m furnished with an eccentric or cam ml, against which
latter the lever l (when the device is in position for reproducing, as shown in dotted
lines in Fig. 3) bears. By turning the stop m and consequently the cam m³, the

page_text: lever may be moved slightly and the lateral adjustment of the reproducing point
effected. During this operation, the pressure of the thumb or finger may be used to
maintain the lever in contact with the cam.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, we claim:-
1. For use in phonographs, graphophones and the like, the improved recording and
reproducing device, arranged or operating substantially as herein described.
2. In a phonograph, graphophone or the like, mounting the recording and
reproducing points on separate levers and independently connecting them to the same
diaphragm-cross-head.
3. In a phonograph or like instrument, connecting the recording and reproducing
points to the same diaphragm, substantially as herein described and whereby the
lever carrying each of the said points is capable of independent action; the device
being moreover changeable from the recording to the reproducing position (or vice
versa), so that the one point may assume the position vacated by the other.
4. For use in phonographs, graphophones and the like, a recording and reproducing
device wherein the recording and reproducing points are carried by separate levers,
respectively connected with the diaphragm-cross-head by separate links, substantially
as herein described; each of the said levers being mounted upon a weight which is
pivotally attached to the diaphragm frame, and means being provided for enabling
the device to be turned about its axis and the position of the points to be
reversed.
phonograph or like instrument wherein the recording and reproducing
points are mounted on separate levers independently connected with the diaphragm-
cross-head as herein described, modifying the pressure of the point upon the
phonogram by pivoting the weight carrying the recording (or reproducing) point.
substantially as herein described and so that a substantial portion thereof projects
beyond the point of connection with the diaphragm frame.
T
1005
For the Applicants,
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.