An Improved Ball Cock.
Year: 1894

page_text: Date of Application, 9th July, 1894
Complete Specification Left, .8th Apr., 1895-Accepted, 11th May, 1895
An Improved Ball Cock.
JOHN TEMPLETON No. 7 St. James's Terrace North Circular Road Dublin
Bookkeeper do hereby declare the nature of this invention to be as follows:-
The improvement in the ballcock shown on accompanying drawings consists in
the peculiar form given to the lever, and is designed to enable a full way ball cock
to close against any water pressure.
By preference I construct it as shown in the accompanying drawings. The
curve marked CD is a portion of the "Archimedean spiral" or "heart cam
" and
A the fulcrum of the lever also acts as the centre round which the spiral or cam
revolves. M is the piston or valve against which the spiral or cam is caused to
press.
When the water falls in the cistern or tank, the spiral or cam is made to revolve,
and the eccentric, movement caused thereby allows the valve to open, and when the
water rises in the cistern or tank a similar movement in the opposite direction shuts.
the valve.
I do not confine myself to the form of ballcock shown in the accompanying
drawings, nor to the exact position on the lever of the spiral or cam, both of which
may be varied so as to secure the advantages above named.
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 :-
1st. The application of the Archimedean spiral or heart cam, or such portion of
this spiral or cam as may be necessary, to the levers of ballcocks for the purposes
herein before.described.
2nd. That while the long arm of the lever carrying the float ball remains
constant, the short arm of the lever to which the spiral or cam is attached
increases from or diminishes to zero, during the opening and closing of the valve.
3rd. That by the use of this form of lever, the valve of the ball cock will close
irrespective of the water pressure opposed to it.
Dated this the Seventh day of July 1894.
JOHN TEMPLETON, formerly of No. 7 St. James's Terrace North Circular
Road Dublin, but now of No. 19 St. Patrick's Road Drumcondra, Dublin Book-
keeper 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 improvement in the ball cock' shown in the drawings left with Provisional
Specification, consists in the peculiar form given to the lever and is designed to
enable a full way ballcock to close against any water pressure.

page_text: By preference I construct it as shown in the above mentioned drawings. The
curve marked CD is known as the Archimedean spiral A the fulcrum of the lever
also acts as the centre round which the spiral revolves. M is the piston or valve
against which the spiral is caused to press.
When the water in the cistern or tank is discharged the float ball describes a
circulatory movement, with the lever of ballcock as radius round A as centre.
The spiral being formed on the opposite end of the lever also revolves, and the
eccentric movement caused thereby allows the valve to open, and when the water
rises in the cistern or tank a similar movement but in the opposite direction closes
the valve.
I do not confine myself to the form of ballcock shown in the drawings left with
Provisional Specification, nor to the exact position on the lever of the spiral both
of which may be varied so as to secure the advantages above named.
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 :-
1st. The application of the Archimedean spiral or such portion of this spiral as
may be necessary to the levers of ballcocks for the purposes hereinbefore
described.
Dated this the Sixth day of April 1895.
JOHN TEMPLETON.