IMPROVEMENTS IN APPARATUS FOR RAISING SCAFFOLDING, Roofs, AND THE LIKE
Year: 1877

page_text: LETTERS PATENT to Joseph John Lish, of Scottish Chambers, Granger Street
West, Newcastle-upon-Tyne, in the County of Northumberland, for the Inven-
tion of "IMPROVEMENTS IN APPARATUS FOR RAISING SCAFFOLDING, Roofs,
AND THE LIKE"
Sealed the 17th April 1877, and dated the 5th February 1877.
PROVISIONAL SPECIFICATION left by the said Joseph John Lish at the
Office of the Commissioners of Patents on the 5th February 1877.
JOSEPH JOHN LISH, of Scottish Chambers, Grainger Street West, Newcastle-
upon-Tyne, in the County of Northumberland. "IMPROVEMENTS IN APPARATUS
FOR RAISING SCAFFOLDING, ROOFS AND THE LIKE"
In the Specon. to Letters Patent granted to me on the 5th May 1873, No. 1621,
I described means of raising the panels and scaffolding for erecting concrete
buildings by the use of screws working in the walls of such buildings.
My present Invention relates to improvements in the apparatus to be employed
in this manner in erecting buildings generally, or in raising scaffoldings, roofs, and
the like, and to other forms of raising apparatus which may be used instead of screws
and nuts for like purposes.
In employing screws and nuts I make the nuts separable so that they can be put
on to or taken off the screws laterally, and I prefer to fit them with rollers working
on the screw threads so as to diminish friction. The nuts may be either held in
the interior of the wall whence they can be taken out as the screw rises above
them, or they may rest on brackets projecting from the face of the wall or from the
uprights of scaffolding. Or otherwise, these uprights may be made double with a
space between them in which the screw can work the nuts resting on cross pieces.
On the head of the screw I mount scaffolding or framing from which suitable
scaffolding is suspended, or when the nuts rest on brackets or cross pieces the
As the building
Scaffolding may be suspended from the lower ends of the screws.
is raised, the screws or the nuts are turned from time to time raising the scaffolding,
and when a screw is thus raised out of one of the nuts in which it works I unclasp
that nut and clasp it on the upper part of the screw and so on successively, taking
care that the screw shall always have a firm bearing in at least one nut.

page_text: Instead of screws and nuts I sometimes use toothed racks with plain or worm
pinions or pawls working in their teeth, such pinions or pawls being in that case
mounted in frames that can be put on or taken off the racks in a manner similar
to the nuts employed with screws.

page_text: together so as to break joint, having fastened on them at intervals cleats on which
are rested brackets K for supporting the nuts B and C which are placed on slotted
plates L laid on the brackets. The scaffold may be supported on the top of the
screws as shewn in Figs. 1 and 2 or may be suspended from a collar at the lower
end of the same, as shewn at a in Fig. 3.
A form of separable nut applicable for the purpose of my Invention is shown to
an enlarged scale in Fig. 6 which is a sido view; Figs. 7 and 8 which are sectional
plans, shewing respectively the nut closed on the screw A. and opened up for being
removed from or placed on the screw. This nut consists of a pair of half plates M
at top and bottom rule jointed on a pin O and having rivetted to them two layers
of blocks N, which are made at their inner faces at n with projections and recesses
nearly, but not quite, fitting the threads of the screw A. Between the plates M are
mounted two grooved rollers P with their axos at such inclination that the grooves
fit and engage with the threads of A. The two halves of the nut can turn upon
the pin O so as to open up, as shewn in Fig. 8, admitting the passage of the scrow A
between their jaws, whereupon the halves can be closed together and secured by a
pin Q, as shewn in Figs. 6 and 7. In this condition the rollers P ongage with the
threads of the screw forming a rolling nut for it and so reducing friction, and the
projections on the faces n of the blocks N will prevent the screw from slipping in
case the rollers P should give way.
Fig. 9 is a sido view, and Fig. 10 a plan of an arrangement of nut put on the
scrow in halves and supported by a bracket from an upright of scaffolding.
Fig. 11 is a section through the nut. In this case A is the screw; B, B, the two
halves of the nut which are held between two bracket cheeks C, C, bolted to the
upright D. When it is desired to remove the nut and replace it in another position
the checks C are unbolted from the upright at the one place and bolted to it again
whero desired.
Instead of a screw and nut, a rack moved by a worm pinion may be employed
for the purposes of my Invention, as shewn by Fig 12 which represents this arrange-
ment in vertical section. Here A is a rack which is substituted for the screw
having teeth that engage with the threads of a worm R that can be turned by a
bar S in either direction so as to cause the rack A to ascend or descend as required.
T, T, are rollers which serve to keep the teeth of A from becoming disengaged from
the worm.
Having thus described the nature of the said Invention and in what manner the
same is to be performed, I would have it understood that I make no general claim
to the use of screws for raising scaffoldings, roofs and the like, but I claim,-
First. The use of separable nuts for screws employed to raise scaffoldings, roofs,
and the like, so that they can be readily unclasped from and clasped on to such
screws as the building proceeds, substantially as herein described.
Second. The construction of separable or jointed nut with antifriction rollers,
substantially as herein described with reference to Figs. 6, 7, and 8 of the accom-
panying Drawings.
Third. The use, for raising scaffolding, roofs, and the like, of racks worked by worm
pinions, substantially as herein described with reference to Fig. 12 of the accom
panying Drawings.
In witness whereof, I, the said Joseph John Lish, havo hereunto set my
hand and seal, this Thirty-first day of July, in the year of our Lord One
thousand eight hundred and seventy-seven.