Improvements in Rotary Steam or other Fluid Motors.
Year: 1899

page_text: Date of Application, 4th Sept., 1899
Complete Specification Left, 5th June, 1900-Accepted, 21st July, 1900
PROVISIONAL SPECIFICATION.
Improvements in Rotary Steam or other Fluid Motors.
We, HERBERT DECIMUS PAINE, of 40, Paxton Road, Chiswick, in the County of
Middlesex, Engineer, and EDWARD GEORGE PAINE, of 24, Dorset Street, Blandford,
in the County of Dorset, Engineer, do hereby declare the nature of this invention.
to be as follows:-
This invention relates to an improved steam or other fluid motor of the rotary
type, and it consists essentially of two rollers or drums in mutual engagement
by means of two or more helically arranged grooves and webs, the said rollers
or drums being mounted on suitable axles rotating in a steam tight chamber the
arrangement being such that the steam or other Huid admitted into one end of
the chamber passes into the helical grooves in the one roller or drum and
exerts pressure on the helical webs on the other roller or drum and thus imparts
motion to them.
The case or chamber is so shaped that it partly encircles each of the rollers
or drums, closely fitting the one having the helically arranged grooves, and the
webs on the other one.
Steam is admitted onto one end of that part of the case or chamber containing
the roller or drum having the helically arranged grooves through a suitably
arranged port, the arrangement of the helical grooves being such that each groove
is cut off before its exhausts at the other end. Thus no valve gear is required
and by compounding two sets of relative proportions, any degree of expansion
may be obtained.
In order to prevent waste of steam between the webs and the grooves in which
they work the passage must be barred at least in the plane of diametrical coin-
cidence i.c. where the centre lines of cross section of piston and groove coincide.
This may be effected by fitting thin pieces of metal at suitable intervals along the
webs in such a manner that their planes be parallel with the cross section
thereof. These plates engage with recesses in the sides of the grooves in the
other roller or drum and are of such a shape and size that just before one piece
gets clear of its recess the one next behind it comes into operation to bar the
passage of the steam.
1000
Improvements in Rotary Steam or other Fluid Motors.
We, HERBERT DECIMUS PAINE, formerly of 40, Paxton Road, Chiswick, in the
County of Middlesex, but now of 31, St. Helen's Road, Dorchester, in the County
of Dorset, Engineer, and EDWARD GEORGE PAINE, of 24, Dorset Street, Blandford,

page_text: in the County of Dorset, Engineer, do hereby declare the nature of this inven
tion 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 an improved steam or other fluid motor of the rotary
type.
In the accompanying drawing which illustrates-by way of example-one form
our invention may assume; Figure 1 is a view in side elevation partly in section
of a motor constructed according to the present invention,
Figure 2 is a view in front elevation thereof, and
Figure 3 is a view in transverse section.
Throughout the views similar parts are marked with like letters of reference.
The motor consists essentially of two rollers or drums A and B mounted on
suitable axles a and b adapted to rotate in bearings carried on the covers C and D)
of a steam tight casing or chamber E. The rollers or drums A and B are in
mutual engagement by means of two or more helically arranged grooves a', a¹,
on the roller or drum A and webs b¹, b, on the roller or drum B.
The casing or chamber E in which the rollers or drums A and B are adapted
to rotate is so shaped that it partly encircles each of the rollers or drums, closely
fitting the one A having the helically arranged grooves a', ', and the webs b', bi,
of the other one B.
Steam is admitted through the port e formed in the cover and exhausts
through a port df (shown in dotted lines on Figure 2) formed in the cover D.
The admission ends of the drums or rollers should work steam tightly against
the cover C as shown and the pitch or arrangement of the helical grooves a¹, a',
and the webs 61, 61, should be such that each section or steam space formed by
and between the said grooves and webs and the casing is cut off before it exhausts
and so prevent or avoid slip of steam back towards the admission end.
To allow of greater expansion of the steam or other fluid employed, we make
the helical grooves and webs of a varying pitch.
To enable the motor to be reversed any suitable valve arrangement may be
fitted whereby the flow of the steam or other fluid may be reversed, that is to
say, by making the exhaust port the admission one and the admission port the
exhaust one.
Power may be taken off from the motor in any suitable manner: a con-
venient way is to make the axle pass through a stuffing box formed on the
cover C as shown.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
(1) A steam or other Huid motor of the rotary type consisting essentially of two
rollers or drums in mutual engagement by means of two or more helically
arranged grooves and webs, the said rollers or drums being mounted on suitable
axles rotating in a steam tight chamber furnished with suitable inlet and
exhaust ports and so shaped that it partly encircles each of the said rollers or
drums closely fitting the one provided with the helically arranged grooves and
the webs of the other one, as set forth.
(2) A steam or other fluid moter of the rotary type, constructed and arranged
substantially as hereinbefore described and shown.
ROBERT E. PHILLIPS, Assoc.M.Inst.C.E., M.I.Mech. E.,
Chartered Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicants.