Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Multipart
Patent
1990-02-20
1991-07-09
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Multipart
411412, 52704, F16B 3502
Patent
active
050300520
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an improvement in ties for securing wall structures, such as a house wall to a wooden structure such as a floor or roof.
By way of example of the application of such ties, in older buildings it is often found that an exterior wall will tend to bulge outwardly. This is caused by a variety of factors such as wall tie corrosion, moisture expansion, wind loads etc. It is also a requirement of current building regulations in the United Kingdom to restrain wall structures at each floor level which forms a diaphragm. A conventional way of doing this is to attach metal brackets to the wall by means of masonry bolts and to attach the brackets to the wooden structure, that is to say to joists forming part of the wooden structure. This is an expensive and time-consuming operation requiring lifting of floor boards and, when there is a fitted cupboard or sanitary suite adjacent to the wall, these have to be dismantled before the floor boards can be lifted.
In U.K. Patent No. GB 2130327B there is described a tie bolt for use in securing a wall structure to a wooden structure incorporating joists without having to gain direct access to that wooden structure, the tie bolt having a shank which is provided thereon with equally pitched screw-threaded portions which are spaced apart by an intervening unthreaded portion and which are adapted to be screwed into two substantially parallel spaced apart wooden joists, the tie bolt being adapted at its head to be secured in or to be clamped against a wall structure to support the wall structure relative to a structure of which the joists form a part.
One drawback with this tie is that the distance between joist centers is not standard on building structures and therefore ties of many different lengths need to be produced. Since the ties are machined and the shank of the tie is turned to enable a smooth running between joists, the ties can be weak around this central area as well as being expensive to produce.
An object of the present invention is to provide a tie bolt which can be made to the required size on site, which is strong and which can be used to secure a wall structure to a wooden structure incorporating joists without having to gain direct access to that wooden structure.
According to the present invention there is provided a tie bolt comprising a shank provided thereon with equally pitched screw-threaded portions separated by a spacer portion capable of sliding through a hole created by the leading screw-threaded portion so as to permit rapid screw-engagement of the trailing screw-threaded portion with said hole, characterized in that said threaded portions are provided by separate components arranged at a predetermined distance apart.
Preferably, said screw-threaded components are mounted on a common carrier rod which preferably also receives the spacer portion in the form of a separate sleeve or tube trapped between the screw-threaded components.
Preferably, the spacer tube when placed over the rod abuts the two screw-threaded components enabling the screw-threaded components to tighten onto the rod when they are secured, thereby providing the tie with more rigidity.
In order to insert a tie bolt according to the invention, it is simply necessary to cut the screw threaded rod and spacer to length and assemble the tie. A hole is then drilled through the wall structure of sufficiently large diameter for the tie bolt to pass through freely and it is then advantageous to drill a pilot hole through the two joists. The tie bolt can then be inserted through the wall structure from the outside and can be screwed into the joists without having to gain direct access to the joists from within the building.
When it is desired to secure the inner skin (in the case of a cavity wall) to the structure of which the joists form a part, such as a wooden floor, it is sufficient to provide suitable fastening means, e.g. a bolt and backing plate, on the tie bolt to engage the inner skin. Alternatively, a conventional type of expansion anchorage can be fitte
REFERENCES:
patent: 1207391 (1916-12-01), Frauenheim
patent: 4854797 (1989-08-01), Gourd
Anderson Alan T.
Fraser Gordon W.
Clan Contracting Limited
Wilson Neill R.
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