Improvements in Fluid Motors Especially Suitable as Water Meters.
Year: 1899

page_text: Date of Application, 21st Mar., 1899-Accepted, 6th May, 1899
COMPLETE SPECIFICATION.
Improvements in Fluid Motors Especially Suitable as Water Meters.
I, LEONARD BURRELL, Engineer, of 37, Rua de Santa Luzia, Rio de Janeiro,
Brazil, 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 improvements in the motors described in my Specifi-
cation No. 9899 of 1898.
Figures 1 and 2 are vertical longitudinal and transverse central sections of
a water meter constructed according to this invention. Figures 3, 4 and 5 are
horizontal sections on the lines 3-3, 4-4 and 5-5 Figure 2.
Figures 6 and 7 are sections on the lines 4-4 and 5-5 Figure 2 showing the
valve separately. Figure 8 is a corresponding plan of the ports.
There are two cylinders a and b preferably cast in one piece each containing
a pair of reciprocating single acting pistons al al which are joined together
by means of racks d, these racks gear with pinion wheels e which run loose in
opposite directions and the shaft f which is rotated in the same manner as that
already described in the Specification No. 989998.
1
1
I now however employ self acting clutches in place of pawls, these clutches g
are fixed to the shaft f and have ratchet teeth gearing with similar ratchet
teeth of the pinion wheels e and they are held in contact with the same by means
of helical springs h, the teeth referred to are set in opposite directions in each
pair and thus allow one pinion to run loose alternately at each stroke.
The pistons are preferably those known as the Kennedy patent with roller
rubber rings.
Water is distributed to the cylinders by one rotary valve k, the water entering
at 7 and discharges at m; the valve is keyed to the shaft f by which it is rotated
and the water is admitted to the cylinders by four radial ports no pq leading
to passages n o p q in the cylinder casting.
In the position shown in the drawings the ports and o are both closed whilst
is fully open to the supply and p to the exhaust the arrangement being such
that when one pair of pistons are at the end of their stroke with their ports
closed the other pair are exactly half way on their stroke with ports full open,
consequently in the working of the machine all dead points are avoided.
The valve consists of a disc divided into two semicircular chambers of supply
and exhaust by means of a division k¹, the supply pipe leads into the circular
channel which is therefore always in communication with the pressure water
and the exhaust pipe m is always in communication with the circular channel m¹.
The water is prevented from leaking from the pressure side of the valve to
the outlet by means of the packing ring and tongue t and the centre of the valve
is also packed with a spiral spring and ring to prevent any leakage into the
counting mechanism : the rings referred to revolve with the valve.
The counting mechanism is placed above the valve box and the spindle
which transmits the motion from the main shaft is keyed to the valve.

page_text: The gearing is accessible for examination by means of the door z which opens
on hinges y.
The covers are screwed into the ends of the cylinders and in the covers
are fitted blocks of india rubber z to prevent any possible jar from the piston
heads.
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. in mechanism of the class referred to, is:-
1. The self acting clutches substantially as described.
2. Arranging the valve in such manner that when the pistons in one cylinder
are at the end of the stroke the ports are closed whilst in the other cylinder the
pistons are at mid-stroke and the ports fully open, substantially as described.
3. The valve substantially as described and illustrated in the drawings.
4. Motors substantially as described and illustrated in the drawings.
Dated this 21st day of March 1899
CARPMAEL & Co.,
Agents for the Applicant.