Improved Controlling or Regulating Gear for Ship's Telegraphs and other Indicating Instruments.
Year: 1898

page_text: Date of Application, 15th Apr., 1898
Complete Specification Left, 16th Jan., 1899-Accepted, 15th Apr., 1899
PROVISIONAL SPECIFICATION.
Improved Controlling or Regulating Gear for Ship's Telegraphs and
other Indicating Instruments.
I, JAMES HOWIE, of 10E, Devonshire Buildings, Barrow-in-Furness, Lancashire,
Gentleman, do hereby declare the nature of this invention to be as follows:-
My invention relates to improved controlling or regulating mechanism for
ship's telegraphs or other indicating instruments, the object being to control
such indicating instruments in a simple and efficient manner by neutralizing
the back-lash which always occurs where gearing is employed.
This is
effected by the application of interrupted screw gear as hereinafter set forth, and
by this means accuracy in the indication is assured.
66
"
In carrying my invention into practical effect, my improved continuous and
interrupted screw gearing, as applied to ship's telegraphs, comprises a continuous
screw and nut the latter being furnished with guide pins working in, through
or upon a hollow cylindrical interrupted screw to which is connected a suitable
pointer or other form of indicator.
The aforesaid guide pins work in grooves of interrupted screw and are ex-
tended to suitable guide blocks which keep the nut from revolving with the
continuous screw, and impart a rotary motion to the pointer when working thus
giving the desired distance of travel, the interrupted part of screw allows the
nut to move, at the same time keeping the pointer or indicator in position, the
travel of nut on interrupted part of screw makes ample allowance for "back-
lash" that may occur in gearing on shafting.
Although this invention is herein described as applied to ship's telegraphs it
is obvious that it may also be used in connection with other indicating instru-
ments.
TY
. 13
2
1000
Improved Controlling or Regulating Gear for Ship's Telegraphs and
other Indicating Instruments.
I, JAMES HOWIE, of 10E, Devonshire Buildings, Barrow-in-Furness, Lancashire,
Gentleman, 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:-
My invention relates to improved controlling or regulating mechanism for
ship's telegraphs or other indicating instruments, the object being to control

page_text: such indicating instruments in a simple and efficient manner by neutralizing
the "back lash" which always occurs where gearing is employed.
This is
effected by the application of interrupted screw gear as hereinafter described and
by this means accuracy in the indication is assured. In carrying my invention
into practical effect, my improved continuous and interrupted screw gearing, as
applied to ships telegraphs, comprises a continuous screw & nut the latter being
furnished with guide pins working in through or upon a hollow cylindrical inter-
rupted screw or a cylinder having a cam grove cut in it which consists of portions of
a helix connected by portions parallel with the axis of the said cylinder to which
is connected a suitable pointer or other form of indicator. The aforesaid guide
pins work in grooves of interrupted screw and are extended to suitable guide
blocks which keep the nut from revolving with the continuous screw and impart
a rotary motion to the pointer when working thus giving the desired distance
of travel the interrupted part of screw allows the nut to move at the same time
keeping the pointer or indicator in position, the travel of nut on interrupted
part of screw makes ample allowance for "back lash" that may occur in gear-
ing on shafting. Although this invention is herein described as applied to
ships telegraphs, it is obvious that it may also be used in connection with other
indicating instruments. And in order that my invention may be more clearly
understood and readily carried into practice I will proceed to describe the draw-
ings annexed which show the arrangement proposed attached to a ship's ordinary
engine room telegraph.
Fig. 1 is the transmitter and
Figs. 2, 2 the receiver. The gearing insures that the indications shall be the
same on both instruments.
Figs. 3, 3, represent two views (front and side) of a hollow cylinder through
which a grove is cut to form guides or guide bars may be substituted which
prevent the nut 5 revolving when the uninterrupted screw Fig. 4 revolves. Fig. 6
is a hollow cylinder through which is cut the interrupted screw through which
the lugs of the nut Fig. 4 project the action of these parts are as follows
viz. —
When the screw Fig. 4 is turned in either direction it causes the nut Fig. 5
to travel longitudinally and the projecting lugs on the said nut 5 causes the
cylinder Fig. 6 (upon which the pointer of receiver is fixed) to turn intermit-
tently & causes the said pointer to stop on the centre of the divisions of the index
on the said receiver.
Having now particularly described and ascertained the nature of my said
invention and in what manner it is to be performed I declare that what I
claim is:-
Firstly. An uninterrupted screw working within a hollow cylinder with an in-
terrupted screw cut thereon and the whole being contained within guide bars.
Secondly. The placing of an interrupted screw within the uninterrupted screw
with guide bars attached as described above.
Thirdly. To prevent "back lash" by the use of an interrupted screw in the
mechanism of indicating instruments.
Dated this Fifteenth day of January 1899.
L. EDWARD HEWETT,
50, Haldon Road, Wandsworth, S.W.,
Agent for Applicant.