Year: 1886

page_text: Date of Application, 29th June, 1886.
Complete Left, 29th Mar., 1887.
Complete Accepted, 29th Apr., 1887
I, JOHN SMITH RAWORTH, of Belvedere Road, Lambeth, in the County of Surrey,
Electrical Engineer, do hereby declare the nature of this invention to be as follows:-
According to my invention which is applicable to single and double cylinder engines
both simple and compound the engine is constructed with a cast metal crosshead
formed in one piece with the slide blocks-this casting is hollow and open at ono side
and one end and the crosshead pin is rigidly fixed (as a stud) in one side. When this.
form of crosshead is employed in an engine with an overhung single crank it is
possible to slide the connecting rod off the crank pin and crosshead without slacking
the brasses.
In the case of a double cylinder engine the two cylinders are according to my
invention provided with opposite cranks one bearing between the two cranks and
another bearing at a considerable distance from the first.
In carrying out this part of my invention the two cylinders are placed side by side,
acting upon two cranks which should be set 180° apart. One crank is made double
and the other single, by preference a disc. The crank shaft is carried in two bearings
only, one placed between the two cranks and the other at a comparatively long distance
away from the first on the extension of the shaft between the double crank and the
fly-wheel, driving pulley or coupling.
The object of this arrangement is to obviate a large portion of the direct strain of
the engines upon the crank shaft bearing and thereby to reduce friction and wear.
The saving in this respect with quick running short stroke engines will be very
considerable, and at the same time all trouble arising from the crank shaft getting out
of adjustment may be eliminated.
It is desirable to employ a crankshaft of ample strength as the strains to which it
will be subject will be greater than with ordinary arrangements.
T
1000
JOHN SMITH RAWORTH.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C., :
Agent for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Steam Engines.
I, JOHN SMITH RAWORTH, of Belvedere Road, Lambeth, in the County of Surrey,
Electrical 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 :-
According to my invention, which is applicable to single and double cylinder
engines both simple and compound, the engine is constructed with a cast metal cross-
head formed in one piece with the slide blocks; this casting is hollow and open at one
side and one end and the cross-head pin is rigidly fixed (as a stud) in one side.
When this form of cross-head is employed in an engine with an overhung single
crank, it is possible to slide the connecting rod off the crank. pin and cross-head
without slacking the brasses. In the case of a double cylinder engine, the two
cylinders are, according to my invention, provided with opposite cranks, one bearing
between the two cranks and another bearing at a considerable distance from the first.
In carrying out this part of my invention the two cylinders are placed side by side,
acting upon two cranks which should be set 180° apart. One crank is made double
and the other single, by preference a disc. The crank shaft is carried in two bearings
only, one placed between the two cranks, and the other at a comparatively long
distance away from the first on the extension of the shaft between the double crank
and the fly wheel, driving pulley, or coupling.
The object of this arrangement is to obviate a large portion of the direct strain of
the engines upon the crank shaft bearings and thereby to reduce friction and wear.
The saving in this respect with quick running short stroke engines will be very
considerable, and at the same time all trouble arising from the crank shaft getting out
of adjustment may be eliminated.
It is desirable to employ a crank shaft of ample strength as the strains to which it
will be subject will be greater than with ordinary arrangements.
Referring to the accompanying sheet of drawings,
Fig. 1 is a side elevation and Fig. 2 an end view of a double cylinder engine
embodying my invention.
Fig. 3 is a side elevation partly in section showing my improved crosshead and its
relation to a connected crank.
1 is a cross-head; 2, 2, are slide blocks; and 3 is a cross-head pin. These are
formed by preference all in one piece of metal, the cross-head being open at one side
and at one end, namely, the lower end in the example shown clearly in Fig. 3. In

page_text: that figure, 4 is a connecting rod from the pin 3 to an overhung crank pin 5 carried
by a crank disc 6. 7 is a plate secured by a screw to the outer end of the pin 3 to
prevent the connecting rod 4 slipping off. 8 is a similiar plate secured in like manner
to the crank pin 5 for the same purpose.
Referring to Figs. 1 and 2 in which a two-cylinder engine is shown with cross-
heads such as above described, 9 is a shaft with cranks 10 and 11 'arranged 180°
apart, the crank 10 being a double one, and the crank 11 an overhung disc crank.
12 is a bearing between the two cranks, and 13 is a bearing near the band wheel or
fly wheel 14.
Having now particularly described and ascertained the nature of the said invention,
and in what manner it is to be performed, I declare that what I claim is
11
1. The hereinabove described construction of cross-head with a projecting pin 3.
2. The hereinabove described relative arrangement of the cranks of the shaft 9 and
the bearings in which that shaft is mounted.
Dated this 29th day of March A.D. 1887.
JOHN SMITH RAWORTH,
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C.,
Applicant's Agent.