Improvements in Means for Obviating the Dead Centres in Steam and the like Engines.
Year: 1893

page_text: Date of Application, 7th June, 1893
Complete Specification Left, 27th Feb. 1894-Accepted, 21st Apr., 1894
3119m
DRAVINTA
Improvements in Means for Obviating the Dead Centres in Steam
and the like Engines.
I, WILLIAM KNAPP 15 Miriam Road Plumstead, Kent, Engineer, do hereby
declare the nature of this invention to be as follows:-
This invention relates to means for obviating the "dead centres" in steam and
other engines and consists in gearing the driving cranks to the flywheel, through
the medium of excentrically set toothed wheels so that the cranks alternately
"lose & gain" upon one another; the gain being so arranged as to carry the one
driving crank over the "dead centre position, when the other crank is at or just
approaching the dead centre position.
"
In applying my invention to a steam engine, I mount the flywheel upon a shaft,
& upon this shaft I mount two spur or toothed wheels excentrically. The driving
cranks are attached to two spur or toothed wheels excentrically mounted & gearing
with the said toothed wheels upon the shaft carrying the fly wheel. By this
arrangement the cranks alternately move at a faster or slower speed, one crank
being at the faster speed when the other is at the slower; the faster speed or gain
carrying the one crank over the "dead centre" position, when the other crank is
at or approaching the dead centre position.
Dated this 7th day of June 1893.
E. EATON,
Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Means for Obviating the Dead Centres in Steam
and the like Engines.
"
I, WILLIAM KNAPP 15 Miriam Road Plumstead Kent 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 relates to means for obviating the "dead centres in steam and
other engines and consists in gearing the driving cranks to the fly wheel through
the medium of excentrically set toothed wheels so that the cranks alternately lose
and gain upon one another the gain being so arranged as to carry the one driving
crank over the dead centre position when the other crank is at or just approaching
the dead centre position. In applying my invention to a steam engine, I mount
the fly wheel upon a shaft and upon this shaft I mount two spur or toothed wheels
excentrically, set at opposite points to each other. The driving cranks are
attached to two spur or toothed wheels excentrically mounted and gearing with the
said toothed wheels upon the shaft carrying the fly wheel. By this arrangement
the cranks alternately move at a faster or slower speed one crank being at the
faster speed when the other is at the slower the faster speed or gain carrying the
one crank over the "dead centre position when the other crank is at or
approaching the dead centre position. In order that
my
invention may be fully
understood I annex drawings to which I now refer in which,
Figure 1. is a side elevation of my invention.
Figure 2. plan view of my invention.
"

page_text: a is a flywheel which is carried by the bearings b. on the spindle or shaft c.
This shaft c is secured to the toothed wheels d d these toothed wheels are
excentrically set on the shaft c at opposite points to each other and gear with
corresponding toothed & excentrically set wheels e e. These wheels e, e, are secured
to the shaftsff carrying the cranks G & g. H & h are the two piston rods. The
working is as follows. Owing to the wheels d d and e e being excentrically set or
mounted the relative rate of movement of the cranks G. & g. varies according to
the relative positions of the toothed wheels d d and e. & e so that when either of the
cranks G or g is in the same plane as the axes of the shafts ff & cylinder of the
engine the other crank will be past the plane as shown in Fig. 1. and owing to this
alternate gaining and losing of the one crank upon the other, the dead centres are
obviated.
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 :-
1. In means for obviating dead centres in cycles, lathes engines etc. employing
two, or "twin cranks" with power applied to each consecutively cranks secured to
toothed wheels excentrically set upon the axis of the cranks, the said toothed
wheels gearing into corresponding toothed wheels excentrically set upon the shaft
or axis to be driven. Substantially as described.
Dated this 27th day of February 1894.
E. EATON,
Agent for Applicant.