Improvements in Trip Valve-gear of Motive-power Engines.
Year: 1889

page_text: Date of Application, 10th Sept., 1889
Complete Specification Left, 7th June, 1890-Accepted, 12th July, 1890
PROVISIONAL SPECIFICATION.
Improvements in Trip Valve-gear of Motive-power Engines.
I, CHARLES DAY, of 136 Love Lane, Heaton Norris, near Stockport in the County
of Lancaster, Engineer do hereby declare the nature of this invention to be as
follows:-
My invention is applicable to Corliss and other trip gears in which the steam and
exhaust valves are actuated by one eccentric, my object being to materially increase
the period of time during which the trip mechanism can be controlled by the governor
and this I effect by the interposition of a rotating eccentric or equivalent placed
between the governor rod and trip mechanism.
In one arrangement I propose to employ a shaft driven by and preferably at the
same speed as the main crank shaft; on this shaft are mounted a pair of bevel wheels
facing one another the first of which is fast on the shaft to the boss of the second
wheel which is loose on the shaft is keyed a small eccentric or crank which is connected
by suitable levers to the trip motion; gearing into both of the bevel wheels and free
to revolve partly round their axis is a third wheel the three wheels forming an
epicyclic train this third wheel is mounted loose on a movable stud pivoted to a rod
the movement of which is controlled by the governor in the manner to be described.
The rod which is controlled by the governor balls is pivoted to a lever fulcrumed on
a shaft. which is thus caused to turn slightly on its axis when the governor moves to
this shaft is also fulcrumed another lever the end of which is pivoted to one end of the
rod which actuates the stud and causes it and its bevel wheel to revolve partially round
the other two wheels any movement of the governor rod being thus communicated to
the bevel wheel with the eccentric on its boss the result being that the trip piece will
be caused to come into action and the steam valve to be closed at an earlier or later
period of the stroke according as the governor balls have risen or fallen.
The movement of the governor rod may be communicated to the epicyclic train of
wheels and small eccentric in any convenient manner other than that described and as
this eccentric with its connections to the trip mechanism is entirely independent of the
motion of the rod actuating the steam valves the trip action is very sensitive and
certain.
Dated this 9th love of Condom 1000
COMPLETE SPECIFICATION.
Improvements in Trip Valve-gear of Motive-power Engines.
I, CHARLES DAY, of 136 Love Lane, Heaton Norris, near Stockport, in the County
of Lancaster, 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 :-
My invention is applicable to Corliss and other trip gears in which the steam and
exhaust valves are actuated by one eccentric, my object being to materially increase
the period of time during which the trip mechanism can be controlled by the governor
and this I effect by the interposition of a rotating eccentric or equivalent placed
between the governor rod and trip mechanism.
And in order that my invention may be fully understood and readily carried into
effect I will describe the accompanying Sheet of Drawings reference being had to the
figures and letters marked thereon.
Fig. 1 is a side view of a portion of a motive power engine to which my invention

page_text: is applied and Fig. 2 is a side view on an enlarged scale of my improved trip valve
gear.
In this arrangement a represents the main or crank shaft of the engine on which is
mounted the eccentric 6 to which is connected the eccentric rod 6 pivoted at the
other end to an arm à fulcrumed above to a stud secured to the engine frame; to the
other end of the arm c is pivoted a rod d connected to a lever e which actuates the
admission and exhaust valves placed at the inner end of the cylinder the lever e is
also connected to the admission and exhaust valves at the other end of the cylinder by
arod d' the exhaust valves, the spindles of which are lettered g g' and the admission
valves the spindles of which are lettered h¹ are all opened positively from the
eccentric by the parts described and the exhaust valves are also closed by the same
mechanism.
:
For my improved trip valve gear I employ a shaft i driven preferably from and
at the same speed as the main shaft a; on this shaft i are mounted a pair of bevel
wheels facing one another the wheel is fast upon the shaft i while to the boss of
the wheel which is loose on the shaft is keyed a small eccentric k which is connected
by a train of lovers and rods 11 12 13 14 to the trip piece m for actuating the trip
motion of the admission valves.
A third bevel wheel n gearing into both the bevel wheels j j¹ is mounted loosely on
and free to revolve partly round a movable stud pivoted to a rod o the movement of
which is controlled by the governor by means of a shaft 9 and lever » actuated by the
governor rod. The shaft 7 is thus caused to turn slightly on its axis when the speed
of the governor varies whereby the bevel wheel n is caused to revolve partially round
the other two wheels jj and so turns the bevel wheel j¹ this movement being trans-
mitted by the eccentric k and levers 11 12 13 14 to the trip piece m which acts upon a
catch piece or stirrups for releasing the admission valves according to the movement
of the governor, springs or weights, not shown, being employed to close the admission
valves.
Instead of the eccentric k I might employ a crank and instead of the arrangement
of three bevel wheels jj and n I might employ various alternative arrangements, for
example I might mount an eccentric on a spiral groove in a boss moved backward or
forward by connections from the governor so as to adjust the position of the eccentric
aud cause it to release the trip mechanism earlier or later as required.
7 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 is :-
The combination with the pair of bevel wheels jj and the movable bevel wheel'n,
or an equivalent arrangement, of the eccentric k or its equivalent the position of which
is controlled by the governor for the purpose of regulating the release of trip
mechanism and so controlling the closing of the admission valves substantially as herein
.set forth.
Dated this fith day c
1000
H. B. BARLOW,
17, St. Ann's Square, Manchester, Agent for Applicant.