GB2095732A - Security bars - Google Patents

Abstract

A security bar for location across window openings, or the like, comprising an outer sleeve (1) closed at its ends by means of plugs (3) and containing an internal, freely rotatable rod (2), antifriction means such as ball bearings (4) are located between the ends of the rod (2) and the inserted plugs (3). An attempt to saw through the bar is resisted by rotation of the internal rod (2) when met by the teeth of a saw or the like. <IMAGE>

Description

SPECIFICATION Improvements in and relating to security bars This invention concerns improvements in and relating to security bars, that is to say bars of the kind which are secured across openings such as windows, in order to prevent unauthorised passage through the opening.

In accordance with the invention there is provided a security bar comprising an outer casing formed by a length of metal tubing sealed at its opposite ends, and an inner core formed by a metal rod fitting within the tubular outer casing and being freely rotatable therein, antifriction means being provided between the ends of said rod and the ends of said outer casing.

Preferably, said antifriction means comprise ball bearings.

The invention is illustrated by way of example in the accompanying drawings, in which: Figure 1 is a side view shown partly broken away, of a security bar in accordance with the invention, and Figure 2 is an exploded view illustrating internal components of the security bar shown in Figure 1.

Referring to the accompanying drawings, a security bar comprises an outer sleeve 1 formed, for example, by a mild steel tube of 9/8 inches external diameter and having a wall 3.25 mm. in thickness, within which is located a freely rotatable rod 2, formed for example of 1/2 inch diameter mild steel rod. The ends of the sleeve 1 are closed by means of plugs 3 which are welded in place to seal the sleeve 1 when the assembly of the components is complete. Ball bearings 4, for example of 1/2 inch diameter, are located between the ends of the rod 2 and the ends of the inserted plugs 3, and serve to reduce the frictional forces resisting rotation of the rod 2 within the outer sleeve 1. If desired, a lubricant may be applied to the ball bearings 4 during assembly of the components.

In use a security bar as described above may be located across an opening such as a window, preferably with the longitudinal axis of the rod extending vertically, the free ends of the bar being secured permanently in place, for example by being set in concrete, the ends of the bar being embedded in the concrete for a sufficient distance that only the portion of the outer sleeve 1 which is overlapping the internal rod 2 is freely exposed.

Thus, if any attempt is made to remove the security bar by sawing or filing through the same, the teeth of the saw or file, after passing through the outer sleeve 1 will meet the freely rotatable rod 2 which will tend to turn with any movement of the saw or file, and thus resist sawing thereof.

Thus it will be seen that the arrangement in accordance with the invention provides a novel assembly capable of use as a security bar and being highly resistant to any attempt at removal thereof by sawing. Although such a bar is considered adequate for normal use when manufactured from, for example, mild steel, it will be appreciated that other materials, such as high tensile steel, may be employed if the cost is warranted.

Claims

1. A security bar comprising an outer casing formed by a length of metal tubing sealed at its opposite ends, and an inner core formed by a metal rod fitting within the tubular outer casing and being freely rotatable therein, antifriction means being provided between the ends of said rod and the ends of said outer casing.

2. A security bar as claimed in Claim 1, wherein said antifriction means comprise ball bearing elements arranged between the ends of said internal rod and the ends of said outer casing.

3. A security bar substantially as described herein with reference to the accompanying drawings.

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

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in and relating to security bars This invention concerns improvements in and relating to security bars, that is to say bars of the kind which are secured across openings such as windows, in order to prevent unauthorised passage through the opening. In accordance with the invention there is provided a security bar comprising an outer casing formed by a length of metal tubing sealed at its opposite ends, and an inner core formed by a metal rod fitting within the tubular outer casing and being freely rotatable therein, antifriction means being provided between the ends of said rod and the ends of said outer casing. Preferably, said antifriction means comprise ball bearings. The invention is illustrated by way of example in the accompanying drawings, in which: Figure 1 is a side view shown partly broken away, of a security bar in accordance with the invention, and Figure 2 is an exploded view illustrating internal components of the security bar shown in Figure 1. Referring to the accompanying drawings, a security bar comprises an outer sleeve 1 formed, for example, by a mild steel tube of 9/8 inches external diameter and having a wall 3.25 mm. in thickness, within which is located a freely rotatable rod 2, formed for example of 1/2 inch diameter mild steel rod. The ends of the sleeve 1 are closed by means of plugs 3 which are welded in place to seal the sleeve 1 when the assembly of the components is complete. Ball bearings 4, for example of 1/2 inch diameter, are located between the ends of the rod 2 and the ends of the inserted plugs 3, and serve to reduce the frictional forces resisting rotation of the rod 2 within the outer sleeve 1. If desired, a lubricant may be applied to the ball bearings 4 during assembly of the components. In use a security bar as described above may be located across an opening such as a window, preferably with the longitudinal axis of the rod extending vertically, the free ends of the bar being secured permanently in place, for example by being set in concrete, the ends of the bar being embedded in the concrete for a sufficient distance that only the portion of the outer sleeve 1 which is overlapping the internal rod 2 is freely exposed. Thus, if any attempt is made to remove the security bar by sawing or filing through the same, the teeth of the saw or file, after passing through the outer sleeve 1 will meet the freely rotatable rod 2 which will tend to turn with any movement of the saw or file, and thus resist sawing thereof. Thus it will be seen that the arrangement in accordance with the invention provides a novel assembly capable of use as a security bar and being highly resistant to any attempt at removal thereof by sawing. Although such a bar is considered adequate for normal use when manufactured from, for example, mild steel, it will be appreciated that other materials, such as high tensile steel, may be employed if the cost is warranted. Claims

1. A security bar comprising an outer casing formed by a length of metal tubing sealed at its opposite ends, and an inner core formed by a metal rod fitting within the tubular outer casing and being freely rotatable therein, antifriction means being provided between the ends of said rod and the ends of said outer casing.

2. A security bar as claimed in Claim 1, wherein said antifriction means comprise ball bearing elements arranged between the ends of said internal rod and the ends of said outer casing.

3. A security bar substantially as described herein with reference to the accompanying drawings.