A Gauge to be used when Building Chimneys.
Year: 1893

page_text: Date of Application, 5th Apr., 1893-Accepted, 24th June, 1893
COMPLETE SPECIFICATION.
A Gauge to be used when Building Chimneys.
I, ROBERT SCHARF, of Bernburg, Germany, Master Mason, 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 a gauge for use when building chimneys.
When building tunnelled chimneys, at present, the walls are often built out of
line, that is, at some parts they are narrow, and at some parts they are wide, and
pieces of brick and mortar are allowed to project into the chimney. The result of
this irregularity in the building is that such chimneys have little or no draught,
and are very troublesome.
By using my invention, the chimney can be built regular and uniform throughout
its length.
And in order that my said invention may be properly understood, I have here-
unto appended three explanatory sheets of drawings, whereon :-
Fig. 1 is a front elevation, and
Fig. 2 a vertical section of the gauge.
Fig. 3 is a horizontal section of the gauge and showing it expanded to its full
width.
Fig. 4 is a horizontal section of the gauge contracted.
Fig. 5 is a side view of the gauge, when inserted loosely into the chimney.
Fig. 6 is a side view of the gauge expanded out and fixed in the chimney.
Fig. 7 is an enlarged detail view.
Figs. 8 and 9 are enlarged horizontal sections.
Figs. 10 and 11 show a modification.
Referring to the drawings, whereon the same reference letters, wherever repeated,
indicate similar or like parts:-
The gauge consists essentially of a tube which is rectangular in cross section,
and has, under one arrangement, two of its sides a, a, movable. Fitted to the
sides a, a, are fish plates b, b, which are provided with projections c, against which
cogs d, d, fitted to the spindle f, can be pressed, so as to force the sides a, a, out-
wards. The projections c are rounded at one side, as shown, to permit of the
movement of the cogs d. When the shaft, which passes through the cover of
the tube, is turned in one direction by means of the small wheel or handle g', the
cogs, d, d, are disengaged from the projections c, and, by means of a toothed wheel 9,
(see Figs. 8 and 9), on the lower end of the shaft, the plates b and sides a, a, are
drawn together. As a consequence, the gauge is loosened within the chimney and
can be easily drawn out.
The gauge is used as follows:-
It is first placed into position where the chimney has to be built, and, when the
shaft has been turned, so that the cogs d engage with the projections c and force
out the sides a to their full extent, (see Figs. 3 and 8), it is ready to be walled up.
The gauge is now enclosed with brick-work, and, when this has been done, to
prevent the mortar adhering to the gauge, it is forced downward about 1 centimetre.
The handle g' is now turned backwards, and the cogs d are disengaged from the
projections c. At the same time, the teeth d' d' of the cog wheel 9 (see Figs. 8
and 9) engage with the teeth k on the underside of the fish plates b, and pull in the
sides
a, a, in the manner shown at Fig. 9. The fish plates 6 are slotted, as shown,
to admit of their inward and outward movements. As the gauge has now been
contracted in size, it can easily be lifted out of the chimney, or be pulled upwards
ready for the building of a second section if the chimney has to be made higher.
Fig. 6 shows the gauge pulled up ready for the building of a second section.

page_text: When the gauge has been pulled up in this manner, it is again expanded to its full
width, by turning the handle g'. The building of the chimney can now be pro-
ceeded with, as before. As each section of the chimney is completed, the gauge
is contracted and pulled upwards ready for the building of another section.
l
The cover prevents bricks and mortar falling into the chimney, when it is being
built.
}
With the hereinbefore described construction of gauge it is evident that as, only
two of the sides are movable, there is a danger of the other side sticking in the
chimney, and, when the gauge is being raised, damaging the newly laid courses of
brick-work. To obviate this, the sides a', a', may also be made movable. This
can be done in the manner illustrated at Fig. 7, that is, by making the fish plates g
of the sides a¹, a', with D-shaped holes m, through which is passed the shaft f,
which is cut away at opposite sides n, n'. When it is desired to force out the
sides a', a', along with the sides a, a, the turning of the bandle g₁ causes the cut
away parts of the shaft to assume the oblique position (see upper view, Fig. 7)
and force outwards the fish plates g. When the shaft is turned back again, it
assumes the position. as shown at the lower view, Fig. 7, and, as a consequence,
the sides a¹, a', are drawn inwards. By this arrangement, the four sides of the
gauge can be expanded and contracted, as desired.
•
Under a modification, as shown at Figs. 10 and 11, a cam h (see dotted lines)
may be used in lieu of the cog wheel q. The cam h, when turned towards the right
hand, bears against the inclined faces of the projections c, and forces outwards the
fish plates b and sides a. When the cam is turned towards the left hand, the teeth
formed by its cut out parts catch against the projections on the fish plates b, and
pull the sides inwards or contracts them. Fig. 10 shows the sides expanded and
Fig. 11 shows them contracted. The sides a¹ may be operated in the same manner
as at Fig. 7.
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. A gauge for chimneys having two movable sides, arranged and operating
substantially as hereinbefore set forth.
2. A gauge for chimneys having the four sides movable, substantially as herein-
before set forth.
3. The combination with the spindle f, of the cam h and fish plates b, having
projections cand i, substantially as hereinbefore described with reference to
Figs. 10 and 11 of the drawings annexed.
Dated this 4th day of April 1893.
H. D. FITZPATRICK,
70, Wellington Street, Glasgow, Agent.