Year: 1887

page_text: We, DANIEL WILLIAMS, of 38, Flora Street, Cathays, Cardiff, in the county of
Glamorgan, engineer, and WILLIAM ERNEST RAYMOND of Yarmouth, Nova Scotia,
master mariner, 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 consists in a simplified arrangement of gear or mechanism for
reversing the motion of steam and other engines, whereby the desired end is effected
without involving the employment of more than one eccentric for each valve.
According to this invention, the valve spindle is, at the outer end, formed with a
jaw in which is pivotted a block outside which is a radius link connected towards
one end to an eccentric rod. The eccentric is arranged at right angles to the crank.
The radius link is, at its underside, pivotted to sliding blocks working in suitable
guides, and to the pivot pin of the radius link are attached a pair of drag links by
which, when acted upon through the medium of a hand lever, or its equivalent, the
radius link and the blocks on its pivot pin may be moved backwards or forwards.
Accordingly as the radius link is thus moved the position of the valve is altered and
the direction of the motion of the crank shaft reversed at will. Referring to the
accompanying sheets of illustrative drawings, the figure on sheet 1 represents a front
view of a steam engine fitted with gear or mechanism for reversing the motion thereof
in accordance with this invention.
The figure on sheet 2 represents a side view of the same. The cylinder is indicated
by the letter a; b is the valve chest and the valve; g and glare the supply ports,
and d and e the steam and exhaust pipes. At the lower end the valve spindle h is formed
with a jaw in which is a block i loosely fitting on the pin which passes through it.
Upon the upper and lower faces of the block bears the radius link towards one end
of which is connected the eccentric rod n of the eccentric o. The eccentric is set at
right angles to the crank r.
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P is the cross-head, and 7 the connecting rod. The radius link jis pivotted at j¹ to
blocks m free to slide in the guides u.
The guides for the blocks m may be formed in brackets variously designed
according to the description of engine to which the reversing gear is applied.

page_text: C,
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To the pivot pin j¹ of the radius link jare connected a pair of drag links k by which,
when acted upon through the medium of the hand lever pivotted to the frame
radius link and the blocks m are moved backwards or forwards.
Accordingly as the radius link is thus moved, the position of the valve is altered
and the direction of rotation of the driving shafts changed at will.
In the figs. shown in the accompanying drawings the position of the parts is such
that the shafts is represented as being driven in its bearings t in the direction
indicated by the arrow, sheet 1, shown on the eccentric o, and the eccentric rod n
and the valve spindle h ascend together as the radius link oscillates on its pivot j¹.
j
In order to reverse the motion of the engine the radius link j is moved by means of
the hand lever l and drag links h until the blocks m are at the opposite ends of the
guides u. As now the eccentric rod, in the working of the engine, moves up, the
valve spindle descends, the driving shaft rotating in the reverse direction to that
indicated by the arrow, sheet 1.
The drag links k do not move as the engine works, they move only when employed
in changing the direction of motion, as aforesaid.
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 :-
1. In a steam or other engine, the use, for changing the position of the valve
governing the admission of the steam or other motive agent to the cylinder or
cylinders, and, consequently, for changing the direction of rotation of the driving
shaft, of a radius link such as j pivotted to blocks such as m contained within guides
such as u, which radius link enibraces a block such as i pivotted towards the outer
end of the valve spindle, and is connected to an eccentric secured upon the driving
shaft, substantially as herein before described and shown in the appended drawings.
2. In a steam or other engine, the use for changing the direction of rotation of the
driving shaft, of a radius link j, blocks m and i, guides u, drag links k, hand lever l,
or the equivalent thereof, valve spindle h, eccentric rod n and eccentric o, constructed,
arranged and operating substantially as herein before described.
3. The arrangement of parts constituting the improved gear for reversing, with
one eccentric only, the motion of a steam or other engine, substantially as hereinbefore
described.
Dated this 19th day of November 1887.