Improvements in Supply Cocks for Water Meters, Hydraulic Lifts and Analogous Uses.
Year: 1897

page_text: Improvements in Supply Cocks for Water Meters, Hydraulic Lifts
and Analogous Uses.
I, HENRY THOMAS EDWARD KIRKPATRICK, of 5, Rue de la Pépinière, Brussels, in the
Kingdom of Belgium, Patent Agent, 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 the supply cocks used in water meters hydraulic lifts and
other machines for actuating the piston by causing the flow to act alternately on
the two sides or faces thereof.
My said invention consists in a new construction of packing suitable for cocks the
objects of which are to facilitate actuation of the cocks and to ensure tightness of
the parts without necessity for adjustment or lubrication of the packing the pressure
of the liquid being utilized to obtain tightness of the joints.
This result may be attained by use of the packing referred to in various
constructions of cocks.
One arrangement is illustrated in longitudinal section in the accompanying
drawing. a is the cock which has the general form of a truncated cone and is placed
freely in its shell without pivot or nipple and the exterior hollows or recesses in the
trunnions b and c of which are connected by passages 6' and c¹ in order to facilitate
direct admission of the liquid.
a¹ is the stem of the cock which may have a flange or shoulder h or not and is
made to turn alternately in opposite directions in order to change the direction of
flow onto the faces of the piston.
The packing d which is of india rubber or other soft material producing but slight
friction and not affected by water is retained in place by pressure against it of the
projection 9 and through it passes the stem a¹ of the cock the passages 61 and c¹ of
which admit of direct passage of the liquid to the exterior faces of the ends of the
cock as well as to the groove or annular hollow in the packing whereby are produced
expansion of the packing and pressure thereof against the inner surface of the shell
enclosing it and against the conical part i of the stem a¹.
The effect of pressure of the liquid on the cock is to force it towards the smaller
part of its conical seating but the extent to which the cock can be thus forced is
limited by the resistance which the packing offers to compression.

page_text: A plate e perforated at f or not may be interposed between the cock and the
packing to serve as a bearing for the latter.
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 :
A supply cock for water meters hydraulic lifts and analogous machines having
pistons which cock is free in its seating and without pivot and is furnished with a
grooved packing of india rubber or other soft material surrounding its stem as
herein described and illustrated in the accompanying drawing; the arrangement
being such that the shifting of the cock under pressure of the water which is
exerted on the external surface and on the faces of the cock to force it towards
the smaller end of its conical seating shall be limited by resistance to compression
offered by the said packing which surrounds the stem of the cock in such manner
that rotation of the latter may take place without injurious displacement in the
direction of the axis and without appreciable friction of the packing which needs
neither lubrication nor adjustment.
Dated this Thirty-first day of December 1907
W. T. WHITEMAN,
Agent for the Applicant.