Improvements in Gas Engines.
Year: 1892

page_text: Date of Application, 4th May, 1892
Complete Specification Left, 4th Feb., 1893-Accepted, 4th Mar., 1893
E
PROVISIONAL SPECIFICATION.
Improvements in Gas Engines.
I, GEORGE POLLOCK, of Hunter Street, Glasgow, Lanarkshire, Gas Engine
Maker, do hereby declare the nature of my invention to be as follows
This invention has reference to and comprises improvements in connection with
the construction and fittings of the governor or trip mechanisin which regulates
the action of the inlet gas valve of gas engines, all with the object of giving a
more exact and better action of this mechanism than heretofore.
The improvements apply to that form of trip or governing mechanism which
has a valve that is pressed to admit gas by opening inwards against the action
of a light spring which keeps the valve always close when not pressed in and is
pushed inwards by the action of the angled point of a reciprocating tappet lever
fulcrumed on one end of a beam or other equivalent lever actuated by a cam, and
anti-friction pulley to push this lever inwards against the power of a spring, always
keeping the tappet lever out of action except when pushed in by the cam, the cam
being mounted on a shaft geared to rotate once for each double stroke of the
engine. The free end of this tappet lever reciprocates on an inclined rest in front
of the spindle of the valve which is so notched and angled on its top surface that
when the tappet lever reaches the top or apex of its inclined guide rest, and the
Lengine is working at its full power and the cam rotating at the desired minimum
velocity, the tappet always takes into the notch on the valve spindle and presses it
inwards to open the gas valve at each instroke of the piston, but so adjusted that
whenever the engine and cam shaft rotates at a few revolutions above its normal
velocity, the tappet lever comes forward at such a velocity over the apex of its
angled guide that it misses the valve spindle, and allows the engine to go away
without the admission of gas for one or more strokes until the engine is reduced,
to its proper speed. The adjustment of the apex of this guide part is difficult and
requires great care in construction, and my improvements consist in mounting this
angled rest in a vertical slide guide on a bracket beneath and in front of the valve
spindle, with a thumb screw spindle or other equivalent such as a wedge which will
raise and lower the inclined guide on which the tappet rests to adjust it to the finest
increments in height to suit the velocity desired of the engine.
1005
1
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Gas Engines.
I GEORGE POLLOCK of Hunter Street, Glasgow, Lanarkshire Gas Engine
Maker, do hereby declare the nature of my invention, and in what manner the
same is to be performed to be particularly described, and ascertained in and by
the following statement in writing that is to say :-
This invention has reference to and comprises improvements in connection with
the construction and fittings of the governor or trip mechanism, which regulates
the action of the inlet gas valve, of gas engines all with the object of giving a
more exact and better action of this mechanism than heretofore.
The improvements apply to that form of trip or governing mechanism which has
a valve, that is pressed to admit gas by opening inwards against the action of a
light spring which keeps the valve always close when not pressed in, and is pushed
ונ..

page_text: inwards by the action of the angled point of a reciprocating tappet lever fulcrumed
on one end of a beam or other equivalent lever actuated by a cam, and antifriction
pulley to push this lever inwards against the power of a spring, always keeping the
tappet lever out of action except when pushed in by the cam, the cam being
mounted on a shaft geared to rotate once for each double stroke of the engine.
The free end of this tappet lever reciprocates on an inclined rest in front of the
spindle of the valve, which is so notched and angled on its top surface that when
the tappet lever reaches the top or apex of its inclined guide rest, and the engine
is working at its full power, and the cam rotating at the desired minimum velocity,
the tappet always takes into the notch on the valve spindle and presses it inwards
to open the gas valve at each outstroke of the piston, but so adjusted that whenever
the engine, and cam shaft rotates at a few revolutions above its normal velocity the
tappet lever comes forward at such a velocity over apex of its angled guide that
it misses the valve spindle, and allows the engine to go away without the admission
of gas for one or more strokes until the engine is reduced to its proper speed. The
adjustment of the apex of this guide part is difficult, and requires great care in
construction, and my improvements as shown in front view in Figure 1 and sectional
side elevation in Figure 2 consist in mounting this angled rest A by a projecting
square spindle A' with screwed end A³ in a recessed vertical slide fixed guide B
on a bracket B beneath and in front of the valve spindle C with a thumb screw
spindle B³ or other equivalent such as a wedge which will raise and lower within
the guide B¹ the inclined rest A A' on which the tappet rests to adjust it to the
finest increments in height to suit the velocity desired of the engine, a lock nut A³
being mounted on the screw end A' of the spindle A' to retain the angled rest in
the set position.
Having now particularly described, and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
In gas engines the fitting and use of an adjustable angled rest in a vertical slide
guide on a bracket or equivalent support beneath and in front of the valve spindle,
substantially as and for the purposes herein described in reference to and by way
of application shown in the accompanying drawings:
Dated the 3rd February 1893.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.