GB2286419A

GB2286419A - Window bar connector and cover

Info

Publication number: GB2286419A
Application number: GB9402649A
Authority: GB
Inventors: Dennis James Charles Raske; Robert Seeger
Original assignee: UKAE Ltd
Current assignee: UKAE Ltd
Priority date: 1994-02-11
Filing date: 1994-02-11
Publication date: 1995-08-16
Anticipated expiration: 2014-02-11
Also published as: CA2142234C; ES2116679T3; DE69502215D1; EP0667437B1; CA2142234A1; GB9402649D0; EP0667437A1; GB2286419B

Description

1 2286419 CENTRE KEY

TECHNICAL FIELD OF THE INVENTION

This invention relates to a key for joining hollow profiles in the formation of a decorative grille which can be inserted in a glazing panel to simulate traditional Georgian windows. Such keys comprise a unitary part which includes a body portion and a number of tongues which project from the body portion for insertion into the open ends of respective lengths of profile. The key further includes abutment means providing a positive stop for abutment with cut ends of the lengths of profile. Such keys are widely known in the double glazing industry as centre keys, and for convenience will be referred to herein as "a centre key of the kind set forth".

BACKGROUND

In most centre keys of the kind set forth, the body portion remains visible in the finished glazing unit and is designed to provide a matching, aesthetically attractive square edged interface between the cut ends of the profiles. Injection mouldings are widely used to form a one piece component incorporating both the attachment tongues and the centre section. The polymer used is a light-fast, UV stable grade of pigmented engineering 2 plastics. The mass of the centre section can cause so-called weld lines to appear, and can produce shrinkage at the edges which causes the moulded centre to gape apart from the raw cut edges of the profiles.

An alternative form of key which appears in the market place has the body portion made up with metal covers which are held in place by integral tongues which project into the ends of the profiles. This system enables the covers to be paint finished, matching exactly the finish of the profiles. However, this earlier arrangement still has several disadvantages, which include the following:

- The cut ends of the profiles remain exposed detracting from the visual appearance of the finished grille.

- The range of cap configurations which can be produced is very limited due to metal forming techniques.

- The metal caps can chatter against the glass due to vibrations caused by traffic or aircraft for example.

An aim of the present invention may be viewed as being to overcome the limitations of both integrally moulded centre keys and composite keys with metal covers.

SUMMARY OF THE INVENTION

The present invention proposes a profile key of the kind set forth, which is 3 provided with a moulded plastics cap to cover the body portion in use, and the cap has a lip or flange portion which, in use, overlies the cut end of a length of profile when in contact with the abutment means.

The abutment means may be formed on the main part of the key, but is preferably formed on the cap. The position of the cut end is therefore determined relative to the cap rather than the body portion, ensuring that the end is covered irrespective of the relative positions of the cap and body portion.

The cap is preferably secured to main part by snap engagement therewith, although it may also be secured to the main part by use of an adhesive or by welding.

Usually two such caps will be provided, on opposite sides of the body portion.

BRIEF DESCRIPTION OF THE DRAWINGS

The following description and the accompanying drawings referred to therein are included by way of non-limiting example in order to illustrate how the invention may be put into practice. In the drawings:

Figure 1 is a plan view of the main part of a centre key of the invention together with a cap which is shown separately, Figure 2 is an end view of one of the tongues shown in Fig. 1 4 r Figure 3 is longitudinal section taken through the tongue of Fig. 2 in position 111-111 of Fig. 1 DETAILED DESCRIPTION OF THE DRAWINGS

Referring firstly to Fig. 1, the main part 1 of the centre key is an integral plastics moulding which includes a substantially square body part 10 having four tongues 12-15 of known form projecting from its four sides to receive four profile sections 16, shown in outline only. The tongues each have a pair of upstanding longitudinally extending ribs 17 which are continued across the body part 10 to be continuous with the ribs 17 of the opposite tongue. At the root of each tongue the ribs are bridged by a transverse bar 19.

The opposite rear face of the main part 1 is of substantially the same configuration, and a pair of substantially identical caps 3 are provided to completely cover and enclose the opposite faces of the body part 10 (only one being seen in Fig. 1). The front wall 32 of the caps is substantially square and may be of any desired style (e.g. "square cut" or "pyramid") to provide an aesthetically attractive interface between the profiles 16. As can be seen in Fig. 2, an abutment wall 33 depends from each of the four straight edges of the front wall 32, being slightly inset from the extreme marginal edge of the front wall which thus forms a projecting lip 38. The four abutment walls 33 are each provided with double notches 34 to receive the ribs 17 when the cap is superimposed on the body portion 10, in which position the abutment walls 33 are positively located between the four transverse bars 19.

Y Y 1 The two caps 3 may be secured to the body portion 10 by means of a suitable adhesive, bya suitable plastics welding technique, or by means of cooperating snap-engageable formations on the cap and body portion.

When a length of profile 16 is pushed over one of the tongues 12 as shown in Fig. 3, the leading cut end eventually abuts the wall 33 which provides a positive stop for the profile. In this position, the projecting lip 38 closely overlies the cut end of the profile, hiding the cut end from view. Although the lip is only short, its length is still sufficient to cover the end face of the profile in the event of normal shrinkage in the length of the profile.

The caps and body portion can be formed with an aperture for insertion of a resilient glass buffer, to prevent chattering against the glass sheets in a double glazing panel.

The advantages of the present centre key may be summarised as follows:

The cut ends of the profiles are not visible.

2. Only one main part need be moulded for a given size of profile.

3. The main part can be moulded in inexpensive materials without regard to colour, in order to reduce component costs.

4. The moulding tools for the caps can easily be provided with interchangeable inserts for manufacture of various cover shapes.

5. The caps can be moulded from different coloured materials for use with 6 a range of profile colours at minimum cost.

6. The caps can be cycled quicker, reducing moulding costs.

7. Shrinkage problems related to moulding of heavy sections are eliminated.

7

Claims

1. A centre key of the kind set forth, which is provided with a moulded plastics cap to cover the body portion in use, and the cap has a lip or flange portion which, in use, overlies the cut end of a length of profile when in contact with the abutment means.

2. A centre key according to Claim 1, in which the abutment means is formed on the cap.

3. A centre key according to Claim 1 or 2, in which the cap is secured to main part by snap engagement.

4. A centre key according to Claim 1 or 2, in which the cap is secured to main part by an adhesive.

5. A centre key according to Claim 1 or 2, in which the cap is secured to main part by welding.

6. A centre key according to any preceding claim, in which two such caps are provided, for mounting on opposite sides of the body portion.

7. drawings.

A centre key substantially as described with reference to the