GB2024889A

GB2024889A - Wall ties

Info

Publication number: GB2024889A
Application number: GB7926253A
Authority: GB
Original assignee: Tinsley Wire Sheffield Ltd; Tinsley Wire Ltd
Current assignee: Tinsley Wire Sheffield Ltd; Tinsley Wire Ltd
Priority date: 1979-07-27
Filing date: 1979-07-27
Publication date: 1980-01-16

Abstract

A wall tie (1) comprises a length of metal wire bent into a pair of "butterfly" loops serving as anchoring portions (2 and 3) with ends (4) twisted at the middle, at least one anchoring portion being coated in resilient plastics material thus reducing noise transmission through cavity walls. Both anchoring portions (2 and 3) are embedded in mortar (6 and 7) of respective leaves (8 and 9) of a cavity wall, the twisted ends (4) being bent downwards to serve as a drip promoter. Alternatively, the plastics material may extend from both ends of the anchoring portions or the whole of the metal may be coated in the plastics material. A wall tie may be alternatively formed of punched and pressed metal with a bridging portion (12) between two loops formed with a kink to serve as a drip promoter. <IMAGE>

Description

SPECIFICATION Wall ties This invention relates to walls, more particularly cavity walls, and is concerned with the provision of ties for cavity walls.

It has been ascertained that sound transmission through cavity walls is influenced by the type and frequency of any components that bridge the cavity (e.g., wall ties) and transmit vibrations from one wall leaf to the other. Generally speaking, the more rigid the bridging component and the firmer the anchoring of it to the leaves of a wall, the greater will be the sound transmission through the wall. Thus, the type of wall tie made from strip with a twisted portion in the middle for disposition vertically in the cavity (B.S. 1243 type 3) will pass more sound than the type of wall tie made from wire bent into a pair of "butterfly" loops and twisted at the middle (B.S. 1243 type 1).

Wall ties made of resilient plastics material would be suitable for sound insulation, but are not included in the British Standard Specification because of their inability to withstand elevated temperatures such as may arise in proximity to house fires.

The object of the invention is to provide a wall tie (which expression shall be taken as including any component for bridging a cavity wall and adapted to have at least one end anchored in one wall leaf) capable of dampening vibrations and significantly reducing noise transmission through cavity walls, yet satisfying the British Standard Specification with regard to strength, resisting fire hazards and dealing with condensation.

According to the present invention, a wall tie of metal has at least one anchoring portion coated with resilient plastics material. When the coated portion is embedded in mortar or concrete, or when secured to one leaf of a wall by other means, the metal is "cushioned" from the leaf by the plastics material, but in the event of fire destroying the plastics material the metal remains secured to the leaf.

The plastics material must not be so thick that the leaves of a wall bridged by the tie can move independently more than the two or three millimetres needed to dampen vibrations. A suitable plastics material is that known as "Crocel", and a coating of 3 to 4 mm has proved to be most effective.

To be effective', only one leaf needs to be isolated from the metal; thus the plastics material may cover 50 mm from the end of one anchoring portion only. However, the plastics material may extend from the ends of both anchoring portions independently or by coating the whole of the metal, by which latter means the corrosion resistance of the tie is greatly enhanced.

The plastics material may be applied by dipcoating a bent and twisted wire wall tie in a liquid bath or a fluidised bed, or any other suitable means, depending upon the extent of the coating, or ties may be manufactured by bending and twisting plastics coated wire or strip, so that the metal is substantially enclosed in the plastics material, twisted ends of the wire or strip being bent out of the general plane of the wall tie so as to form a drip promoter.

Alternatively the wall tie may be formed of punched and pressed metal with a bridging portion between two loops formed with a kink to serve as a drip promoter, the pressed metal tie being coated in resilient plastics material in any similar fashion to a bent wire wall tie.

A number of embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a perspective view of a wire wall tie with one anchoring position coated in resilient plastics material and shown in use between two leaves of a cavity wall; Figures 2 and 3 are respectively a plan and a side view of the wall tie in Figure 1; Figure 4 is a plan of a wall tie with both anchoring portions coated in resilient plastics material.

Figure 5 is a plan of a wire wall tie substantially coated in resilient plastics material; and Figures 6 and 7 are respectively a plan and a side view of a pressed metal wall tie with one anchoring portion coated in resilient plastics material.

In Figures 1 to 3 a wall tie 1 in accordance with the invention comprises a length of metal wire bent into a pair of "butterfly" loops serving as anchoring portions 2 and 3, and with ends 4 twisted at the middle, the anchoring portion 2 being coated in resilient plastics material 5. Both anchoring portions 2 and 3 are embedded in mortar 6 and 7 of respective leaves 8 and 9 of a cavity wall, the twisted ends 4 being bent downwards to serve as a drip promoter.

In Figure 4 both anchoring portions 2 and 3 of a wire wall tie 1 are coated with resilient plastics material 5.

In Figure 5 a wall tie comprises a length of plastics coated wire bent into a pair of "butterfly" loops to afford maximum soundproofing, the ends (not visible) being twisted as the ends 4 in Figures 1 and 3 to form a drip promoter.

In Figures 6 and 7 a wall tie is punched and pressed with two anchoring portions and a transverse kink 12 between them to act as a drip promoter, the portion 10 being largely coated in plastics material 1 3.

1. A wall tie of metal having at least one anchoring portion coated with resilient plastics material.

2. A wall tie as in Claim 1 wherein the plastics material is that known as "Crocel".

3. A wall tie as in Claim 2, wherein the coating is 3 to 4 mm thick.

4. A wall tie as in any one of Claims 1 to 3, wherein the plastics material covers 50 mm from the end of one anchoring portion only.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Wall ties This invention relates to walls, more particularly cavity walls, and is concerned with the provision of ties for cavity walls. It has been ascertained that sound transmission through cavity walls is influenced by the type and frequency of any components that bridge the cavity (e.g., wall ties) and transmit vibrations from one wall leaf to the other. Generally speaking, the more rigid the bridging component and the firmer the anchoring of it to the leaves of a wall, the greater will be the sound transmission through the wall. Thus, the type of wall tie made from strip with a twisted portion in the middle for disposition vertically in the cavity (B.S. 1243 type 3) will pass more sound than the type of wall tie made from wire bent into a pair of "butterfly" loops and twisted at the middle (B.S. 1243 type 1). Wall ties made of resilient plastics material would be suitable for sound insulation, but are not included in the British Standard Specification because of their inability to withstand elevated temperatures such as may arise in proximity to house fires. The object of the invention is to provide a wall tie (which expression shall be taken as including any component for bridging a cavity wall and adapted to have at least one end anchored in one wall leaf) capable of dampening vibrations and significantly reducing noise transmission through cavity walls, yet satisfying the British Standard Specification with regard to strength, resisting fire hazards and dealing with condensation. According to the present invention, a wall tie of metal has at least one anchoring portion coated with resilient plastics material. When the coated portion is embedded in mortar or concrete, or when secured to one leaf of a wall by other means, the metal is "cushioned" from the leaf by the plastics material, but in the event of fire destroying the plastics material the metal remains secured to the leaf. The plastics material must not be so thick that the leaves of a wall bridged by the tie can move independently more than the two or three millimetres needed to dampen vibrations. A suitable plastics material is that known as "Crocel", and a coating of 3 to 4 mm has proved to be most effective. To be effective', only one leaf needs to be isolated from the metal; thus the plastics material may cover 50 mm from the end of one anchoring portion only. However, the plastics material may extend from the ends of both anchoring portions independently or by coating the whole of the metal, by which latter means the corrosion resistance of the tie is greatly enhanced. The plastics material may be applied by dipcoating a bent and twisted wire wall tie in a liquid bath or a fluidised bed, or any other suitable means, depending upon the extent of the coating, or ties may be manufactured by bending and twisting plastics coated wire or strip, so that the metal is substantially enclosed in the plastics material, twisted ends of the wire or strip being bent out of the general plane of the wall tie so as to form a drip promoter. Alternatively the wall tie may be formed of punched and pressed metal with a bridging portion between two loops formed with a kink to serve as a drip promoter, the pressed metal tie being coated in resilient plastics material in any similar fashion to a bent wire wall tie. A number of embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a perspective view of a wire wall tie with one anchoring position coated in resilient plastics material and shown in use between two leaves of a cavity wall; Figures 2 and 3 are respectively a plan and a side view of the wall tie in Figure 1; Figure 4 is a plan of a wall tie with both anchoring portions coated in resilient plastics material. Figure 5 is a plan of a wire wall tie substantially coated in resilient plastics material; and Figures 6 and 7 are respectively a plan and a side view of a pressed metal wall tie with one anchoring portion coated in resilient plastics material. In Figures 1 to 3 a wall tie 1 in accordance with the invention comprises a length of metal wire bent into a pair of "butterfly" loops serving as anchoring portions 2 and 3, and with ends 4 twisted at the middle, the anchoring portion 2 being coated in resilient plastics material 5. Both anchoring portions 2 and 3 are embedded in mortar 6 and 7 of respective leaves 8 and 9 of a cavity wall, the twisted ends 4 being bent downwards to serve as a drip promoter. In Figure 4 both anchoring portions 2 and 3 of a wire wall tie 1 are coated with resilient plastics material 5. In Figure 5 a wall tie comprises a length of plastics coated wire bent into a pair of "butterfly" loops to afford maximum soundproofing, the ends (not visible) being twisted as the ends 4 in Figures 1 and 3 to form a drip promoter. In Figures 6 and 7 a wall tie is punched and pressed with two anchoring portions and a transverse kink 12 between them to act as a drip promoter, the portion 10 being largely coated in plastics material 1 3. CLAIMS

3. A wall tie as in Claim 2, wherein the coating is 3 to 4 mm thick.

5. A wall tie as in any one of Claims 1 to 3, wherein the plastics material extends from the ends of both anchoring portions.

6. A wall tie as in Claim 5, wherein the whole of the metal is coated in plastics material.

7. A wall tie as in Claim 6 and being manufactured by bending and plastics coated wire or strip, twisted ends of the wire or strip being bent out of the general plane of the wall tie so as to form a drip promoter.

8. A wall tie as in any one of Claims 1 to 5, and being formed of punched and pressed metal with a bridging portion between two loops formed with a kink to serve as a drip promoter.

9. A wall tie substantially as hereinbefore described with reference to Figures 1 to 3, or Figure 4, or Figure 5, or Figures 6 and 7 of the accompanying drawings.