Improvements in Valve Gear.
Year: 1894

page_text: Date of Application, 11th June, 1894-Accepted, 24th May, 1895
COMPLETE SPECIFICATION.
Improvements in Valve Gear.
NEWNHAM BROWNE, of 73 Cheapside, in the City of London, Chartered
Patent Agent, do hereby declare the nature of this invention and in what manner
the same is to be performed which has been communicated to me by Gustav
Honegger of 35 Neue Hochstr., Berlin, in the Empire of Germany, Engineer to
be particularly described and ascertained in and by the following statement:-
This invention is represented in the accompanying drawings in which
Fig. 1 is an elevation and Fig. 2 a plan of so much of the parts as is necessary
to reuder the same intelligible.
The Figures 14, 1B, 24 show details hereafter explained.
The leading idea which has been followed in devising this improved arrangement
of rotary distributing valves was to confine the number of connecting-rods or
links and other movable parts to what is strictly indispensable, so as to obtain
distributing or reversing gear considerably simplified owing to the small number of
shafts or spindles which it contains.
One form in which this main idea or object may conveniently be carried out is
represented in the accompanying drawings in which it is shown in sectional
elevation and in a sectional plan.
The reversing or swinging arm B receives motion through the medium of a
connecting rod or link A, from a crank or eccentric. Upon the pivot D of the
said swinging arm B, which turns on the shaft C, there are loosely passed two
cranks E E, each crank pin F of which is connected by a linked rod G with the
pivot L of the arm H.
Upon the pivot L is loosely mounted the positively operating or "active" cam K
shown in Fig. 14 which guided about the pivot L under the action of a pivot or
pin M forming part of the linked rod G see Fig. 1B; while a spring N, (or the said
cam's own weight,) constantly retains the same in contact with the idle or "passive".
tam J.
Or the said active cam K may be guided by the rod G about the pivot L simply
by causing such active cam to strike the passive cam, situated outside the said
pivot L, say at M; in which case also, however, the active cam is pressed by the
spring N provided for the purpose against the passive cam J.
The passive cam J is keyed or wedged upon the valve-spindle and constantly
weighted by O.
Whenever a revolution takes place in the direction of the arrow, the pivot F
turns concentrically about the shaft C, while the arm H swings about the axis of
its spindle.
By the time the pivot M, as it turns along with the swinging arm B about the
shaft C, arrives at a predetermined position, the link rod G and with it the active
cam K, guided either by means of the pivot M, or by striking the passive cam
(but in either case through the medium of the rod G), will assume a position,
together with the passive cam, that the latter is thrown out of engagement with
the active cam, thereby causing the valve to be suddenly closed. See Fig. 2.
Variable expansion is provided for by so arranging the cranks E E, loosely
mounted upon the shaft D, that they may be symmetrically turned and brought to
the vertical axial line of the swinging arm B from the point P through the medium
of counter-cranks and rails or bars RR, with the result that the crank pins E F
must rise or fall, thereby proportionately increasing or reducing the force of the
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page_text: engagement or frictional contact between the passive and active. cams, or in other
words causing the cylinder or valve chest to be filled with motor fluid to a greater
or less extent.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is.
Mechanism for precisely operating rotary (slide) valves, mainly consisting of a
swinging bar or arm B capable of turning on a shaft C and having loosely mounted
upon its own shaft D, cranks E E with crank pins F F, capable of revolving about
the shaft D at the point P, under the action of the governor S acting through the
medium of, counter cranks corresponding to EE and of rails or bars RR whilst
the link rod G which is connected with the said swinging bar B by the pin F, and
also with the pivot L of the link H, swinging upon the valve-spindle, is adapted to
act in such a manner that the active cam K, loosely mounted upon the pivot L, is
so guided by the pin or pivot M (or by contact at M)-and consequently by the
rod G carrying such pin or point of contact, that whenever the two cams engage
with each other, the force or pressure exercised in such engagement corresponds to
the extent to which the valve-chest is filled with motor fluid:
Dated the 11th day of June 1894.
NEWNHAM BROWNE.