An Appliance for Reducing the Vibration Produced by the Working of Marine Engines.
Year: 1892

page_text: Date of Application, 17th Mar., 1892
Complete Specification Left. 17th Nov. 1892-Accepted, 31st Dec., 1892
PROVISIONAL SPECIFICATION.
An Appliance for Reducing the Vibration Produced by the Working
of Marine Engines.
I, ALFRED FERNANDEZ YARROW of Isle of Dogs, Poplar in the County of
Middlesex, Engineer, do hereby declare the nature of this invention to be as
follows:-
Marine engines of vertical arrangement, by their up and down strokes, cause the
vessel to vibrate. My invention relates to means of reducing the vibration, which
I effect in the following manner. On the engine shaft, at each side of the main
crank if there is only one, or as near as convenient to each end of the crank shaft if
there are several cranks, I provide cranks or eccentrics which are linked to
vertically guided weights. These weights being suitably proportioned to the
unbalanced moving weights of the engine, counteract the tendency of the engine
bed to move up and down, and thus the vessel remains steady without sensible
vibration due to the working of the engines. In addition to the vertically
reciprocating weights, rotating weights on the cranks or eccentrics may be
employed.
A
ד
1 1003
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Appliance for Reducing the Vibration Produced by the Working
of Marine Engines.
I, ALFRED FERNANDEZ YARROW of Isle of Dogs, Poplar in the County of
Middlesex, 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 :-
Marine engines of vertical or nearly vertical arrangement by their up and down
strokes cause the vessel to vibrate. My invention relates to means of reducing this
vibration which I effect in the following manner. On the engine shaft, at each side
of the main crank if there is only one, or as near as convenient to each end of the
crank shaft if there are several cranks, I provide cranks or eccentrics which are
linked to vertically guided weights. These weights being suitably proportioned to
the unbalanced moving weights of the engine, counteract the tendency of the engine
bed to move up and down, and thus the vessel remains steady without sensible
vibration due to the working of the engines.
Fig. 1 of the accompanying drawings is a longitudinal elevation partly in section
and Fig. 2 is an end view of a single cylinder vertical engine, Fig. 3 is a front view
of a three cylinder engine with my invention applied thereto.
As shewn in Figs. 1 and 2, on the shaft S on each side of the crank C, I fix two
eccentrics E set nearly opposite to the crank, and I link them to weights W having
rods moving in vertical guides G. Also, as shewn in Fig. 3, 1 employ two.
eccentrics E linked to weights W and set them at such angles to the cranks that
the weights W moved by them shall best operate in counteracting the vibration
caused by the three sets of unbalanced moving weights of the engines.
In many cases a single weight suffices to reduce vibration to a great extent, this
weight being moved by a single eccentric or crank set at a suitable angle to the
crank or cranks of the engine.

page_text: Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
In a vertical or nearly vertical marine engine, in combination with the crank
shaft, an eccentric or crank working a vertically guided weight, or several of these,
the eccentric or crank being in each case set at such angle to the engine crank or
cranks and the weight moved by it being so proportioned to the unbalanced
moving weights of the engine as to counteract the up and down vibration caused
thereby.
ABEL & IMRAY,
Agents for the Applicant.