GB2299612A

GB2299612A - Bolting device

Info

Publication number: GB2299612A
Application number: GB9604821A
Authority: GB
Inventors: Peter Banham
Original assignee: Banham Patent Locks Ltd
Current assignee: Banham Patent Locks Ltd
Priority date: 1995-04-04
Filing date: 1996-03-07
Publication date: 1996-10-09
Anticipated expiration: 2016-03-07
Also published as: GB2299612B; GB9604821D0

Abstract

An auxiliary bolting device is provided for use as an accessory to a mortice lock. Extension of the lock bolt (2b) into the device pivots a lever of the device to extend an auxiliary bolt (10) and provide additional locking. The device preferably has auxiliary bolts (10) to both sides of the lock bolt (2b). The or each auxiliary bolt is mounted on an adjustable pivot (24) to alter its throw so as to give the desired displacement when the lock bolt is extended.

Description

BOLTING DEVICE This invention relates to.locking arrangements and in particular a bolting device that can be used in conjunction with a lock bolt and be moved automatically to and from a locking position in conjunction withsthe locking and unlocking of the lock bolt.

Such bolting devices are known for use in face mounted security arrangements, an example being shown in GB 321113. It is an object of the present invention, however, to provide a bolting device that can be used in conjunction with a mortice lock.

According to the present invention, a bolting device is provided for use with a mortice lock in which the bolting device and the lock are to be secured at mutually Opposite locations in parts to be locked together and the lock having a bolt extendable into the bolting device for said locking of the parts, the bolting device comprising at least one auxiliary bolt that is displaced by a lever in a casing of the device, said lever being pivotable by the extension of the lock bolt into the bolting device to displace said auxiliary bolt, the lever being adjustably mounted in the casing to accommodate a variation in the throw of the lock bolt relative to said casing to give a desired displacement of said auxiliary bolt when the lock bolt is extended.

Preferably, positive retaining means are provided to lock the lever into a position of adjustment and in particular to prevent displacement from the adjusted position by any pressure force exerted through the operation of the lock bolt or auxiliary bolt. The retaining means can conveniently be in the form of a member through which a pivot support of the lever passes and which abuts a stop face in the bolting device casing.

The retaining member may itself be adjustable or it may be replaceable to give the required adjustment of the lever position.

The positioning of the lever through adjustment of its pivot axis in the bolting device may conveniently be provided by means of an elongate slot in the casing in which a pivot pin of the lever is adjustably secured. In a preferred arrangement, the pivot pin is a screw threaded member which also engages the retaining means and is firmly fixed in place by the retaining means when the desired position of adjustment is achieved. The threaded member is preferably then not rotatable but a rotatable sleeve can be provided between the threaded member and the lever.

For added strength, preferably the mortice lock is provided with a forend having a keep pocket to receive the auxiliary bolt.

It is also preferred to construct the bolting device with a pair of auxiliary bolts that will operate on opposite sides of the lock when actuated by the lock bolt. The auxiliary bolts may be mounted in the casing independently of each other and be independently adjustable.

An embodiment of. the invention will be described in more detail by way of example with reference to the accompanying drawings, in which: Fig. 1 is an exploded illustration of a bolting device according to the invention with its associated lock, and Figs. 2 and 3 are views of the bolting device from opposite sides.

The lock 2 and the bolting device 4 illustrated are both designed to fit into mortices, e.g. in a door and a door frame respectively, with their forends 2a, 4a closely adjacent when the door to be locked is closed.

The lock 2, with the exception of its forend 2a, is entirely conventional and does not require to be described in detail.

The bolting. device 4 comprises a casing 8 containing a pair of auxiliary bolts 10 in this instance, at opposite ends of the casing. The bolts 10 and their operating mechanisms are arranged in mirror image to each other. Each auxiliary bolt is connected by a pivot pin 12 to a lever 14 pivoted intermediate in its length in the casing 8. The inner ends of the levers are bent over to form pads 14a that are jointly contacted by the lock bolt 2b, when that is extended into the bolting device, to pivot the levers. Movement of the levers 14 from their illustrated retracted position shoots the bolts 10 out of the casing to the dot-dash line positions shown in Fig.

3. When so extended they lie in keep pockets 16 that are integral parts of the lock forend 2a. The bolts are guided in their movement by the casing flange apertures 18 through which they slide and by slots 20 in the casing sidewalls in which the pivot pins 16 slide.

The levers 14 are biased by respective coil springs 22 to the retracted position shown. Each lever pivots on an intermediate pivot pin 24, around which the coils of the spring extend. The pivot pins 24 fit in elongate slots 26 in the casing 8 to be each independently adjustable towards and away from the forend 4a. This adjustment is required because the distance between the lock and the bolt arrangement may vary, e.g.

due to the size of gap between the door and the door frame. To ensure that the auxiliary bolts are extended fully despite possible variation of the throw of the lock bolt into the casing from one installation to another, it is therefore desirable to be able to adjust the positions of the inner ends of the levers in the casing.

For this purpose of this adjustment, the pivot pins 24 of the levers take the form of screws which can be clamped in position on the casing by tightening nuts 28 threaded onto them. Between bosses 32 of the levers 14 and the bolt shanks are brass sleeves 34 which allow the levers to pivot freely when the pivot pins are frictionally clamped and also ensure that the pivoting of the levers does not loosen the threaded engagement.

Means are also provided to locate the pivot pins 24 positively when they have been adjusted because they are not accessible when the bolting device has been installed. For this reason, the pivot pins 24 pass through close-fitting holes in brackets 38 which lie against the side face of the casing. One end of each bracket is bent over to form a bearing lip 40 engaging the forward edge of the casing and so forming a positive stop to prevent its pivot pin moving further away from the forend of the casing.

Preferably, a series of alternative size brackets 38 are provided for installation of the bolting device and the appropriate one is then selected when fitting the device in place. By forming the pivot pin 24 from a screw bolt it is easy to replace the bracket 38 during the fitting process if required. It is alternatively possible, however, to provide a bracket that is formed to the correct size in situ, or to employ a bracket or other locking device that is adjustably positioned on the casing to secure the lever pivot pin in its adjusted position.

The casing 8 in the region where the lock bolt is received has an opening 44 on one side to facilitate the fitting of the bolting device but to the other side guide pads 46 are fitted to the ends of the levers 14 to locate them relative to the casing in their pivoting movement. In addition, the casing wall has a bent-out edge 48 forming a lead-in chamber for the lock boit.

These precautions allow the casing to be kept relatively narrow so as to weaken as little as possible the part that must be hollowed to receive the mortice bolting device.

Claims

1. A bolting device for use with a mortice lock and comprising at least one auxiliary bolt and a lever in a casing of the device for displacing said bolt, the lever being pivotable by extension of a bolt of the mortice lock into the bolting device, the lever being adjustably mounted in the casing to accommodate a variation in the throw of the lock bolt relative to the casing to give a desired displacement of said auxiliary bolt when the lock bolt is extended.

2. A bolting device according to claim 1 wherein positive retaining means are provided to lock the lever in a desired position of adjustment.

3. A bolting device according to claim 2 wherein the retaining means is in the form of a member through which a pivot support of the lever passes and which abuts a stop face in the casing.

4. A bolting device according to any one of claims 1 to 3 wherein the casing has an elongate slot in which a pivot pin of the lever is adjustably securable for said lever adjustment.

5. A bolting device according to claim 4 wherein the pivot pin is a screw threaded member which also engages the retaining means to fix said means in place in a desired position of adjustment.

6. A bolting device according to claim 5 wherein a rotatable sleeve provides a pivot bearing between the threaded member and the lever.

7. A bolting device according to any one of the preceding claims provided with a pair of auxiliary bolts arranged to opposite sides of a location for said extension of the lock bolt.

8. A bolting device according to claim 8 wherein said auxiliary bolts are provided with respective independent means of adjustment for their displacement by the lock bolt.

9. In combination, a mortice lock and a bolting device according to any one of the preceding claims.

10. A combination according to claim 9 wherein the lock is provided with a forend having a keep pocket or pockets to receive the auxiliary bolt or bolts.

11. A bolting device constructed and arranged for use and operation substantially as described herein with reference to the accompanying drawings.

12. A combination of a mortice lock and a bolting device constructed and arranged for use and operation substantially as described herein with reference to the accompanying drawings.