Improvement in Valve Gears for Gas, Oil, or other Engines.
Year: 1895

page_text: Date of Application, 27th Sept., 1895
Complete Specification Left, 29th June, 1896-Accepted, 1st Aug., 1896
PROVISIONAL SPECIFICATION.
Improvement in Valve Gears for Gas, Oil, or other Engines.
We EDWARD HESTER NORRIS Engineer of 36 Upper Thames Street London
and CHARLES GERALD HENTY Engineer of 36 Upper Thames Street London
do hereby declare the nature of this invention to be as follows:-
This invention relates to an improvement in gas oil or other engines in which it
is desired to operate the valve or valves once for every two three or more
revolutions.
The gear for actuating the valve consists of an ordinary eccentric keyed on to
the main shaft of engine. A. rod attached to the eccentric rod, by a ball and
socket joint or other suitable means moves in a fixed sleeve.
On this rod are cut a thread or groove or threads or grooves which work
over a pin moveable only in the direction of its own axis in the above fixed
sleeve.
The thread or or groove or threads or grooves are so cut that the rod is caused to
rotate by the lateral movement of the eccentric rod. To ensure the above groove
or thread or grooves or threads travelling over the pin in the same direction the
bottoms of the said grooves are cut on inclined planes so that the pin drops from
one level to another. Or the aforesaid pin is fixed in the rod and a slot is cut in
a sleeve which can also revolve but which cannot move laterally in which latter
case both the rod and sleeve must be so arranged that they can only revolve in one
direction which may be done by small ratchets or otherwise.
By causing the rod to describe one half or other fraction of a revolution at each
stroke of the eccentric and by making the end of the said rod of a suitable shape
it can be made to engage the valve stem and thus open the valve or miss it as
desired.
Cantom Deth 1005
C. G. HENTY.
EDWARD H. NORRIS.
Improvements in Valve Gears for Gas, Oil, or other Engines,
We, EDWARD HESTER NORRIS of 36, Upper Thames Street, London,
Engineer, and CHARLES GERALD HENTY, of the same address, Engineer,
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 an improvement in gas, oil or other engines in which
it is desired to operate the valve once for every two, three or more revolutions of
the main engine, and has for its object the arrangement of a simple device whereby
this function is effected with great facility direct from the main shaft.
This invention consists in the arrangement of a valve mechanism in which a
reciprocating motion produced by a crank, eccentric, or other equivalent on the
main shaft of the engine is transformed into circular motion by the reciprocated
ID

page_text: against the spring pressure, until the end of the stroke is being reached, when the
pin travels over the deep portion of the next oblique groove, and drops into the
same. On the return stroke the pin G, engaging against the side of the oblique
groove, turns the rod D about its axis through a certain arc, which, as shewn in
the drawing, is 90° degrees, the pin G being gradually raised by the inclined
bottom of the groove b until it drops into the next groove a. Now it will be seen
that the drop at the end of each groove prevents the pin from returning in an
opposite direction along the groove it has just traversed, hence the pin G travels
continuously along the grooved path in the same direction about the axis of the
rod. If the ends of the rod D and spindle I are arranged with projections and
recesses, having proportions as shown in the drawing, the valve spindle will be
operated every other revolution. It is obvious that the grooved path may be
arranged around the rod D with alternations of equal angle with one another, in
which case the turning of the rod D is effected on both inward and outward
strokes; the arrangement shown in the drawing however only permits the turning
to take place on the backward stroke, and at a time when the valve spindle I is
not being pressed by the rod D, this latter condition being brought about by the
part of groove a which extends beyond the end of the groove b, allowing the
pin G to travel along the groove a a certain distance before entering the groove b,
such entry taking place when the end of the rod D has just left the spindle I.
The modified form of gear shewn in Figures 3, 4 and 5 is practically the
converse of that already described, that is to say, the pin is placed on the rod D
and the grooved path is arranged upon a sleeve about the rod, and instead of being
continuous, is adapted to move around the axis of the rod D so as to give
progressive steps of movement of the rod D about its own axis. In this case we
shew an eccentric for producing the reciprocating movement, and arrange the rod
to turn about its axis in a similar manner as hereinbefore described. Upon the
red Da featherway J is cut into which engages a feather K, carried by the
ratchet wheel L, shown in Figure 5, so that the latter, while controlling the rotary
movement of the rod D allows it to reciprocate in its guide or bracket. This
ratchet wheel L is operated on by a spring- or weight-pressed detent or pawl M.
Upon the rod D is threaded a sleeve N having a ratchet wheel which is
controlled by a similar detent or pawl P. The rod D carries a pin R, which
engages in the slot or groove S of the sleeve N, the one end of the said slot or
groove being oblique and the other parallel to the direction of the reciprocating
motion. The operation of this modified device is as follows:-When the pin R is
moved from the right to the left it presses against the side of the oblique portion
of groove S, and as the pawl P, engaging in the ratchet wheel o, prevents the
movement of the sleeve against the reaction of the pink on the oblique part, the
pin R moves in a spiral path, turning the rod D about its axis, until it reaches
the parallel part of the groove, when the valve spindle I is operated if the projec-
tions on the rods I and D happen to be opposite one another. On the return
stroke the pin R travels along the slot S until it reaches the oblique portion, when,
as the rod D is restrained from movement by the ratchet wheel L and pawl M, the
sleeve M is turned about the rod D into a new position for turning the rod D
through a given arc.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1st. A valve gear for gas, oil or other engines, in which the rotary motion of
the main shaft is adapted to reciprocate a rod which is arranged to be revolved
about its axis in a step by step motion by co-action with a surface or surfaces
arranged obliquely to the direction of reciprocation, the end of the reciprocating
rod having recesses and projections to engage by abutment and miss the valve
spindle in the various steps of the movement, according as to the proportions of
the projections and recesses to one another.

page_text: 2nd. A valve gear for gas, oil and other engines, constructed and arranged
substantially as described and illustrated in Figures 1 and 2 of the accompanying
drawings.
3rd. A valve gear for gas, oil and other engines, constructed and arranged
substantially as described and illustrated in Figures 3, 4 and 5 of the accompanying
drawings.
Dated this 29th day of June 1896.
FELL & JAMES,
1 Queen Victoria Street, London, E.C., Agents for the Applicants.