Method or Means for Fixing Sorows to Stones or Walls.
Year: 1894

page_text: Date of Application, 2nd Nov., 1894
Complete Specification Left. 23rd July, 1895-Accepted, 28th Sept., 1895
PROVISIONAL SPECIFICATION.
Method or Means for Fixing Sorows to Stones or Walls.
1, JULIUS BOEDDINGHAUS, Engineer, of Stephanienstrasse, Düsseldorf, in the
German Empire, do hereby declare the nature of this invention to be as follows:-
This invention has for its object, to provide simple and efficient means for
Bocuring screws to walls, without requiring wooden dowels, which are apt to weaken
the wall.
For this purpose I take a wire of suitable thickness and coil it on to the screw,
so as to follow the threads of the samo and form a kind of screw nut. The coiling
should commence near the head or thick end of the bolt and procee: towards the
point by laying the wire into or between the threads, so as to touch the bottom of
ile saime, the section of each screw thread being preferably triangular or trapezoidal
(similar to a wood screw). After arriving at the point of the screw, the wire may
be wound backward over the helix already wound' on, but with a steeper pitch, so
as to leave wider interstices between consecutive convolutions of the wire.
After the wire has been laid on, the screw is introduced into a hole which has
been drilled or otherwise formed in the wall, and which is slightly wider than the
diameter of the scrow measured over the outer layer of the wire, after which the
interstices are filled up with plaster of Paris, cement or similar material.
The screw may have an ordinary bolt head, or a ring, or hook or cyclet, and
the wire may be ordinary round metal wire or of any other suitable shape and
material.
After the screw has been fixed in this manuer, it may be screwed out and in
repentedly, without damaging the wall, because the wire serves as a screw nut.
Dated this 2nd day of November 1894.
FAIRFAX & WETTER,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Method or Means for Fixing Screws to Stones or Walls.
I, JULIUS BOEDDINGHAUS, Engineer, of Stephanienstrasse,. Düsseldorf, in the
German Empire, 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 has for its object, to provide simple and efficient means for
securing screws to walls, without requiring wooden dowels, which are apt to weaken
the wall, and do not afford the desired solidity.
For this purpose I take a wire of suitable thickness and coil it on to the screw,
so as to follow the threads of the same and to form a kind of screw nut. The
coiling may commence near the head or thick end of the bolt and proceed towards
the point by laying the wire into or between the threads, so as to touch the bottom
of the same, the section of each screw-thrend being preferably triangular or
trapezoidal and the core of the screw conical (similar to a wood screw). After
Pied

page_text: arriving at the point of the screw, the wire may be wound backward over the helix
already wound on, but with a steepor pitch, so as to leave wider interstices between
consecutive convolutions of the wire.
In the accompanying drawings:
Fig. 1 is a longitudinal elevation of a screw bolt and fastener embodying my
invention,
Fig. 2 shows the screw after its introduction into a wall, with a section of the
fusteuer, consisting of two layers of helically coiled wire,
Fig. 3 is an end view of Fig. 1,
Fig. 4 shows a screw similar to that shown in Fig. 2, but with n fastener consisting
of a single layer of coiled wire.
After the wire has been laid on, so as to form a nut, and then the screw with-
drawn, the nut or wire-coil is introduced into a hole which has been drilled or
otherwise formed in the wall for this purpose, and which is slightly wider than the
diameter of the nut measured over the outer layer of the wire, after which the
interstices are filled up with plaster of Paris, cement or similar biuding material in
a plastic condition.
When the said binding matorial has become sufficiently hard and firm, the screw
bolt which has served as a coro, or another screw bolt having the same diameter
and pitch, is screwed into the wire coil, and may now be screwed out and in
repeatedly, without damaging the wall, because the wire serves as a screw nut
which is secured to the stone or wall by the cement or other binding material.
The screw bolt may have a head of any suitable shape and may be combined
with a washer, plate or other device. Instead of an ordinary round wire, I may
use wire or ribbon of a special shape adapted for its purpose.
A wire coil adapted to serve as a nut for a screw bolt may be embedded in glass,
or cast metal by placing the said coil in the mould and then casting the molten
glass or metal around it. A similar method may be employed for fixing the wire
coil in a block or slab of porcelain, common earthenware, or other plastic material,
the coil being first embedded into the said material while it is in a plastic condition,
and then the latter allowed to harden.
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 device for fastening screws in walls, stone or earthenware, glass, metal or
other solid supports, comprising a helically coiled wire fixed in the said support by
means of cement or similar binding substance, or embedded in the said supporting
material when the latter is in a molten or plastic condition, substantially as
described.
2. A nut for fastening screws in walls or other solid supports, consisting of two
co-axial wire helices, the outer helix having a wider pitch than the inner and being
preferably made of the same piece of wire, substantially as and for the purpose
described.
3. The method of fixing screws in walls, stones or other solid supports, substantially
as described.
Duted this 5th dox of July 180
FAIRFAX & WETTER,
433, Straud, London, Agents.