Improvements in Scaffolding.
Year: 1894

page_text: Date of Application, 30th Apr., 1894-Accepted, 16th June, 1894
COMPLETE SPECIFICATION.
Improvements in Scaffolding.
I, OTOKAR DVORAK of Senftenberg, Bohemia, in the Empire of Austria,
Miller 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 :-
The object of my invention is a scaffolding to be used for existing buildings with
window, door or other openings. The usual timber construction of scaffolding is
complicated and cumbersome for works of this kind, whilst the hanging scaffoldings
or "boats" do not offer sufficient rigidity and steadiness for undisturbed work, and
need much time for being raised and lowered. According to this invention I
construct single triangular supports or frames of preferably iron or steel which
project out from the window or door openings, their lower parts (hereinafter termed
"lower rails") being supported against the outside of the walls, and their upper
parts (hereinafter termed " upper rails") being prolonged through said window or
door openings and fastened to beams or girders bearing against the inner side of
the same wall. Means for adjustment are provided so as to bring the upper rails
of such scaffolding supports into the same plane, and give them the same stretch.
They are covered with planks and provided with girders, as desired so as to form
a firm and convenient scaffolding which is easily accessible from the windows
or doors to which they are applied, quite independently of the height of such
places.
In the accompanying drawings
:-
Figures 1 and 2 are respectively a side elevation and a horizontal view or plan
of the apparatus constructed according to my invention.
Figure 3 is a section on the line X-X of Figure 1.
Figure 4 is a section on the line Y-Y and Figure 5 on the line Z-Z of
Figure 1.
Figure 6 scaffolding of cast iron supports.
abc is the triangular support or frame, a b being the upper rail and a c its lower
rail. 2, 3, 4, 5, 6. 7, and 8 are the different bars, struts and ties which strengthen
the iron frame. I do not limit myself to this precise construction of the triangular
or other support, which is to be constructed after the general rules of this branch
of engineering, either as a truss as in Figures 1 to 5, girder or cast as in Figure 6,
or in any other way so long as, while being sufficiently light it is also strong
enough to carry the load of the scaffold or platform, and can be fastened and used
in the following way. The upper rail is prolonged and secured by ties 10 and a
pair of hinged arms fg to a horizontal timber pl, and the part a bc of the support
is held by a block or beam of wood m over which the pressure is distributed by a
bar connected with the lower rail a c by struts p. In this way the pressure of
the heel of the support is distributed amongst the points uvc. To erect a scaffolding,
one or more supports such as before described are arranged to project out from the
window or door openings and fixed by means of their arms fg and beams pland
supported by other pieces or blocks of wood m n care being taken to arrange them
vertically and in equal height and projection, so that they may be covered with
boards 12 to form a platform for the workmen and the building or equivalent
3 material. At the outer end of each support or frame a vertical bar 11 may be
arranged to support a fencing board or hand or guard rail 13; or any other con-
venient rail wall or fencing may be provided. The distance to which each frame
projects, may be regulated by means of two bars 10 and wedges 10. The bars 10
are provided with holes d and fixed to the web or plate t by bolts & and nuts s'.
D
7

page_text: The two arms and g are hinged to the bands 10 by the bolt O. They are fixed
and held together and against the beam p¹ by means of a bolt and nut k k¹.
Figure 4 and Figure 5 illustrate. the way of fastening. the horizontal bars 10 to the
web or plate t, in prolonging also the angle irons II and the plates bb and so on.
I do not however limit myself to these details, which are merely given as examples.
The support abc can be constructed in many ways for example as before described,
or of sheet iron or steel, or even cast, in different shapes, triangular or as a body
of equal resistance, without changing the character of my invention. Figure 6
gives an example of cast supports for the same purpose. T is a tie which holds
the whole support horizontally upon the horizontal beam or equivalent p² which
bears against the inner face of the existing wall on both sides of the window or
door opening. The tie or bolt T can traverse the whole upper part ab of the
support under the floor, and hold it by its head at T whilst it is retained and
adjusted at the other end by means of a nut q. The tie or bar or bars T may also
be laid on one or both sides of the horizontal part ab of the cast iron or steel
-support a b c.
If desired I may construct the before described frames of other than triangular
form though the triangular form is preferable.
Having now particularly described and ascertained the nature of my suid inven-
tion and in what manner the same is to be performed 1 declare that what I
-claim is :-
1. In scaffolding applicable to window door or other openings in existing walls
two or more supports such as a b c adapted to carry a floor 12 outside the building
so that their heels c press against the outer face of the wall whilst their upper
part or rails a 6 project through the window or equivalent openings and are
supported by the inner face of the wall by means of bars 10 and hinged arms such
as fg or ties such as T and blocks or beams such as p' as set forth.
2. The combination and arrangement of parts constituting the complete
scaffolding device substantially as described and illustrated in Figures 1 to 5
inclusive of the accompanying drawings.
3. The combination and arrangement of parts constituting the complete
scaffolding device substantially as described and illustrated in Figure 6 of the
accompanying drawings.
Dated this 30th day of April 1894.
W. P. THOMPSON & BOULT,
Of London, Liverpool, Manchester, and Nottingham,
Agents for the Applicant.