IMPROVEMENTS IN PISTON STEAM ENGINE INDICATORS
Year: 1884

page_text: GEORGE MAXIMILIAN BORNS of 6 Anhalt Road, Battersea, Surrey, Engineer, do
hereby declare the nature, of the said invention for "IMPROVEMENTS IN PISTON
STEAM ENGINE INDICATORS" to be as follows:
.
In a steam engine indicator according to my invention the drum which carries
the paper or card is arranged concentrically with and around the cylinder to which
the steam is admitted, the spring by. which its return stroke is effected being
interposed between the two. The pencil or marker is carried by a parallel motion
of the "lazy tongs" type, which is attached at one point to;a bracket or stud on
the cylinder or cylinder cover, and at another point to a cross-head connected to
the piston rod and guided by the aforesaid stud or bracket. Sometimes I substitute
for the usual pulleys by which the cord is led to the paper drum an eye. The
arrangements of the piston and spring are similar to those of existing indicators.
Dated this fifteenth day of March 1884

page_text: I, GEORGE MAXIMILIAN BORNS, of 6 Anhalt Road, Albert Road, Battersea,
Surrey, Engineer, do hereby declare the nature of my invention for "IMPROVE
MENTS IN PISTON STEAM ENGINE INDICATORS," and in what manner the same is
to be performed to be particularly described and ascertained in and by the following
statement:-
The object of my Invention is an improved construction of piston steam-engine
indicators, and consists in mounting the drum, upon which the indicator card is
carried, concentrically around the cylinder to which the steam is admitted, as well
as to providing for the return of the drum by interposing a spring between it and
the steam cylinder.
The pencil or marker is carried by the lower end of a parallel motion of the
lazy tong type. The upper end of this motion is attached to a bracket or stud
mounted upon the steam cylinder, or upon its cover. The connection between it
and the piston rod is by means of a cross bead (which may conveniently slide upon
the before mentioned bracket, as upon a guide rod), while the other end is
connected in a suitable way to the parallel motion at a point below that at which
the latter is pivotted upon the aforesaid bracket or stud.
In indicators made according to my invention I sometimes dispense with the
usual pulleys over which the cord is led to the indicator, and substitute an eye for
the same. The piston and piston spring are similar to those of the piston indicators
in general use.
In order that my invention and the means by which the same is carried into
effect may be thoroughly understood, I will proceed to describe the same, referring
to the accompanying drawings which are to be taken as part of this specification
and read therewith, and in which like parts are marked with the same reference
letter.
Figure 1 is a sectional side elevation of my improved indicator, and Figure 2 &
front elevation of the same.
A is the body of the indicator, B the steam inlet, C the cylinder, C¹ the cylinder
cover, C² a retaining ring, D the piston, D¹ the piston rod, and D2 the piston spring.
E is an eye used instead of pulleys, and through which the cord is to be passed to,
E¹, the cord drum.
F is the parallel motion consisting of three pairs of bars F, F, and F. The
bars of any one bar are of equal length, but no two pairs are necessarily of the
same length, as it is clear that by varying their relative dimensions in this respect,
I can make the motion of the pencil a multiple of that of the piston.
G is the marker or pencil, and G' its retaining spring, the effective pressure of
which is regulated by the position of a collar G³. H is a long stud mounted upon
the cylinder cover, although for the purpose of my invention it may be mounted upon
the cylinder end, provided that the point of connection selected permits of the
stud being used as a guide for the crosshead I describe hereafter. H' is a bar
forming, with the long stud H, a bracket, upon the outer extremity of which (and
adjusted, when the indicator is used in a vertical position, so as to be vertically
over the marker G as shewn in Figure 2) is pivotted the upper end, F, of the
parallel motion. I is a cross head making connection between the piston rod, D',
and the parallel motion. An extension, I embraces the stud, H, thereby utilizing
the latter as a guide rod. The cross head is connected to the parallel motion F by
two links F', F, of equal length.

page_text: The stroke of the latter is therefore necessarily parallel with that of the piston,
while its relative length is governed by the proportions of the links of the parallel
notion.
J is the card drum, and J, J, the card clips. J³ is a spiral spring interposed
between the drum and the indicator cylinder for the purpose of returning the former
to its normal position.
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 :-
1. In a steam engine indicator of the piston type, the use of a drum J carrying
the indicator card, and at the same time mounted concentrically with the indicator
cylinder C, as herein before described with reference to the accompanying
drawings.
2. In a steam engine indicator of the piston type, the use, in combination with
the druin Jas defined in the foregoing claim, of a spring Js for the purpose of
returning said drum to its norinal position, as herein before described with reference
to the accompanying drawings.
3. In a steam engine indicator of the piston type, the use, in combination, of
the parallel motion F, consisting of three or more pairs of bars and carrying a
marker or pencil at one end, the links F, F1, the stud H, and bar H¹, to carry the
parallel motion, and the cross head I connected to the piston rod of the indicator,
as herein before described with reference to the accompanying drawings.
PHILLIPS & LEIGH,
Patent Agents,
22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicant.

page_text: I, GEORGE MAXIMILIAN BORNS, of 6, Anhalt Road, Albert Road, Battersea, in
the County of Surrey, Engineer, seek leave to amend the specification of Letters
Patent, No. 4985 of 1884, as shown in red ink in the copy of the original
specification hereunto annexed :-
My reasons for making this amendment are as follows:-
I find that the invention as set out in claims 1 and 2 is not original, but has
|been anticipated by a prior publication. ·
·
In the matter of the application made by George Maximilian Borns for leave to
amend the Specification of Letters Patent N° 4985 of 1884.
I hereby grant leave to the said George Maximilian Borns to amend the said
Specification in the manner proposed.

page_text: GEORGE MAXIMILIAN BORNS of 6 Anhalt Road, Battersea, Surrey, Engineer, do
hereby declare the nature of the said invention for "IMPROVEMENTS IN PISTON
STEAM ENGINE INDICATORS to be as follows:-
:-
"3
.
In a steam engine indicator according to my invention the drum which carries
the paper or card is arranged concentrically with and around the cylinder to which
the steam is admitted, the spring. by which its return stroke is effected being
interposed between the two. The pencil or marker is carried by a parallel motion
of the "lazy tongs" type, which is attached at one point to a bracket or stud on
the cylinder or cylinder cover, and at another point to a cross-head connected to
the piston rod and guided by the aforesaid stud or bracket. Sometimes I substitute
for the usual pulleys by which the cord is led to the paper drum an eye. The.
arrangements of the piston and spring are similar to those of existing indicators.

page_text: I, GEORGE MAXIMILIAN BORNS, of 6 Anhalt Road, Albert Road, Battersea,
Surrey, Engineer, do hereby declare the nature of my invention for "IMPROVE-
MENTS IN PISTON STEAM ENGINE INDICATORS," and in what manner the same is
to be performed to be particularly described and ascertained in and by the following.
statement
The object of my Invention is an improved construction of piston steam-engine
indicators, and consists in mounting the drum, upon which the indicator card is
carried, concentrically around the cylinder to which the steam is admitted, as well
as to providing for the return of the drum by interposing a spring between it and
the steam cylinder..
The pencil or marker is carried by the lower end of a parallel motion of the
lazy tong type. The upper end of this motion is attached to a bracket or stud
mounted upon the steam cylinder, or upon its cover. The connection between it
and the piston rod is by means of a cross head (which may conveniently slide upon.
the before mentioned bracket, as 'upon a guide rod), while the other end is
connected in a suitable way to the parallel motion at a point below that at which
the latter is pivotted upon the aforesaid bracket or stud.
In indicators made according to my invention I sometimes dispense with the.
usual pulleys over which the cord is led to the indicator, and substitute an eye for
the same. The piston and piston spring are similar to those of the piston indicators
in general use.
In order that my invention and the means by which the same is carried into
effect may be thoroughly understood, I will proceed to describe the same, referring
to the accompanying drawings which are to be taken as part of this specification
and read therewith, and in which like parts are marked with the same reference
letter.
Figure 1 is a sectional side elevation of my improved indicator, and Figure 2 a
front elevation of the same.
A is the body of the indicator, B the steam inlet, O the cylinder, C the cylinder
cover, C² a retaining ring, D the piston, D¹ the piston rod, and D³ the piston spring.
E is an eye used instead of pulleys, and through which the cord is to be passed to,
E¹, the cord drum.
F is the parallel motion consisting of three pairs of bars F1, F2, and F³. The
bars of any one bar pair are of equal length, but no two pairs are necessarily of the
same length, as it is clear that by varying their relative dimensions in this respect,
I can make the motion of the pencil a multiple of that of the piston.
G is the marker or pencil, and G₁ its retaining spring, the effective pressure of
which is regulated by the position of a collar C². H is a long stud mounted upon
the cylinder cover, although for the purpose of my invention it may be mounted upon
the cylinder end, provided that the point of connection selected permits of the
stud being used as a guide for the crosshead I describe hereafter. H³ is a bar
forming, with the long stud H, a bracket, upon the outer extremity of which (and
adjusted, when the indicator is used in a vertical position, so as to be vertically
over the marker G as shewn in Figure 2) is pivotted the upper end, F, of the
parallel motion. I is a cross head making connection between the piston rod, D¹,
and the parallel motion. An extension, I embraces the stud, H, thereby utilizing
the latter as a guide rod. The cross head is connected to the parallel motion F by
two links F, F, of equal length.

page_text: The stroke of the latter is therefore necessarily parallel with that of the piston,
while its relative length is governed by the proportions of the links of the parallel
motion.
J is the card drum, and J, J2, the card clips. J³ is a spiral spring interposed
between the drum and the indicator cylinder for the purpose of returning the former
to its normal position.
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
4. In a steam engine indicator of the-piston-type-the-use-of-a-drum-J-earrying
the-indicator-card, and at the same time-mounted-concentrically with the-indicator
eylinder-Cas herein before: described--with reference-to-the-accompanying
drawings.
2. In-a-steam-engine-indicator of the piston-type; the-use,-in-combination-with
the drum-J-as defined in the foregoing claim, of-a-spring-js-for-the-purpose of
returning-said-drum-to-its normal position,-as-hereinbefore-described-with-reference
to-the accompanying-drawings.
3. In a steam engine indicator of the piston type, the use, in combination, of
the parallel motion F, consisting of three or more pairs of bars and carrying a
märker or pencil at one end, the links F, F, the stud H, and bar H, to carry the
parallel motion, and the cross head I connected to the piston rod of the indicator,
as hereinbefore described with reference to the accompanying drawings.
Dated this 21st day of November 1884.
>
PHILLIPS & LEIGH,
Patent Agents,
22, Southampton Buildings; Chancery Lane, W.C.;
•
Agents for the Applicant..