GB2265938A - Striking plate assembly - Google Patents

Abstract

A mortice lock striking plate assembly for installation in a rebated casement edge 10 comprises a striking plate proper 1 and a rim piece 11. The rim piece 11 comprises a metal strip 12 with bent-up ends 13A, 13B to line a cut- away portion 18 of the rebate tongue 17, and a pair of bent-up mounting tags 14A, 14B which in the installed assembly lie beneath the plate proper 1. This form of rim piece 11 enables a standard striking plate 1 to be retained for rebated installation. <IMAGE>

Description

Striking Plate Assembly The present invention relates to striking plate assemblies for mortice locks to be used on folding hinged doors or other such members (hereinafter referred to as "casements") which have their meeting edges rebated so as to overlap when closed. With installations of this kind it is required to cut away part of the tongue of the rebated casement edge which is to receive the striking plate if the latter is to be mounted centrally, and the cut-away portion of the tongue is usually lined with a metal rim piece attached to the striking plate proper both to provide a neat finish to the carpentry and to protect and reinforce the remaining part of the tongue which may be left as only a relatively thin strip of material in this area.

A typical prior art rebated striking plate assembly is shown in United Kingdom patent specification no. 714387.

This comprises an assembly of striking plate and rim piece which can be connected together in alternate orientations to suit rebates of either hand. More particularly, the rim piece comprises a metal casting which can be located upon the front face of the striking plate (that is to say the face presented towards the lock) and secured by means of screws passed through from the rear face of the striking plate into tapped holes in enlarged mounting blocks at each end of the rim piece. This form of assembly means that the overall length of the striking plate must be greater than that of a standard striking plate for the same lock, because the forend of the lock must be accommodated between the mounting blocks of the rim piece.Both the striking plate and rim piece must therefore be produced as special items for rebate installation and the standard striking plate which is normally supplied with the lock must be discarded in this case.

Such practice is therefore somewhat wasteful and it is an aim of the present invention to provide a striking plate assembly which can avoid this problem of the prior art.

In one aspect the invention accordingly resides in a mortice lock striking plate assembly for installation in a rebated casement edge comprising a striking plate proper and a rim piece therefor, the rim piece comprising a metal strip to line a cut-away portion of the rebate tongue and a pair of flat, spaced apart mounting tags extending from said strip to lie, in use, beneath the plate proper (that is to say between the rear face of the plate and the casement). The invention also resides per se in a rim piece for such an assembly.

In use of the invention, since the mounting blocks of the prior art rim piece are dispensed with and replaced by tags to lie beneath the striking plate proper, the overall length of the latter need not be increased for assembly with the rim piece and a standard striking plate can be employed in the assembly.

The rim piece preferably comprises a metal, e.g. brass, stamping from which the mounting tags are bent to lie perpendicular to the strip which lines the cut-away portion of the rebate tongue. The ends of that strip may also be bent to line the upper and lower margins of the cut-away portion.

The mounting tags of the rim piece preferably contain clearance holes to pass fixing screws which align with similar holes in the striking plate proper so that both components can be fastened to the casement edge together using the same screws.

A preferred embodiment of striking plate assembly according to the invention will now be more particularly described, by way of example, with reference to the accompanying drawings; in which: Figure 1 is an "exploded" view of the components of the assembly together with the prepared rebated casement edge; Figure 2 shows a blank from which the rim piece of the assembly is formed; and Figure 3 shows the rim piece formed from the blank of Figure 2.

Referring to Figure 1 there is indicated at 1 the striking plate proper, which may comprise a standard striking plate for use with a mortice sash lock. It comprises a plate 2 with two apertures 3A,3B to receive the spring bolt and deadbolt of the associated lock and a bevelled lip 4 to press in the spring bolt on closure of the associated casement. The illustrated embodiment is in the form of a box striker with a box structure 5 attached by rivets 6 to the rear of the plate 2, but in other embodiments it may comprise only a plate such as 2. At each end the plate 2 has a pair of countersunk clearance holes 7A,7B and 8A,8B to pass screws 9 for attaching the plate to the edge of the casement 10.The disposition of the bolt apertures 3A,3B and lip 4 is symmetrical about the mid height of the plate 2 so that by inverting the plate from the illustrated orientation it is suitable for fitting to a casement of opposite hand to that shown in Figure 1.

The other component of the assembly is a rim piece 11.

This comprises a metal strip 12 of which the two ends 13A, 13B are bent at right angles, and from which extend a pair of flat mounting tags 14A,14B. The tags have respective clearance holes lSA,lSB to pass screws 9 and are spaced apart such that these holes align with the holes 7A,8A respectively in the plate 2 when the components are correctly juxtaposed for installation. The rim piece 11 is made from a stamped metal, e.g. brass, blank 16 of the shape illustrated in Figure 2, from which the two ends 13A,13B and tags 14A,14B are bent up in a press to form the finished article as also seen in Figure 3. When fitted to a casement of opposite hand to that shown in Figure 1 the rim piece 11 will be inverted from the illustrated orientation together with the plate 1.

Returning to Figure 1, this also shows the preparation of the edge of the casement 10 to receive the striking plate assembly. The tongue 17 of the rebate is cut away at 18 to receive the assembly, the rim piece 11 lining the upper, side and lower margins of the cut-away portion 18 when installed. The casement edge is also relieved at 19 and 20 to receive the plate 2 and box 5 and a further section is removed at 21 to clear the bevelled lip 4.

The section 19 is further relieved at 22A and 22B to receive the tags 14A,14B respectively, and pilot holes for the screws 9 are shown at 23. The assembly is installed with the tags 14A,14B of the rim piece 11 lying beneath the plate 2 and with the strip 12 embracing the inner side edge of that plate, and fastened with the screws 9 of which two pass both through the plate 2 and the tags 14A,14B.

Claims (6)

1. A mortice lock striking plate assembly for installation in a rebated casement edge comprising a striking plate proper and a rim piece therefor, the rim piece comprising a metal strip to line a cut-away portion of the rebate tongue and a pair of flat, spaced apart mounting tags extending from said strip to lie, in use, beneath the plate proper.

2. An assembly according to claim 1 wherein the rim piece also has flat end sections extending at each end of said strip to line the upper and lower margins of a said cut-away portion.

3. An assembly according to claim 1 or claim 2 wherein the rim piece is formed from a flat metal blank from which said mounting tags and any said end sections are bent.

4. An assembly according to any preceding claim wherein the mounting tags of the rim piece have respective clearance holes to pass fixing screws which holes align with respective clearance holes in the striking plate proper to pass the same fixing screws when assembled together.

5. A mortice lock striking plate assembly substantially as hereinbefore described with reference to the accompanying drawings.

6. A rim piece for use in an assembly according to any preceding claim.