GB2195695A

GB2195695A - Lockable sliding bolt

Info

Publication number: GB2195695A
Application number: GB08623561A
Authority: GB
Inventors: Bert Coton
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-10-01
Filing date: 1986-10-01
Publication date: 1988-04-13
Also published as: GB8623561D0

Abstract

A lockable sliding bolt comprises: a spigot housed in a bolt housing 12 and adapted to move relative to the housing between an extended position and a retracted position; retaining means in the form of cam 23 having a releasable operative mode in which it serves to retain the spigot in the extended position; and a key-operated lock 20 operatively connected to the cam 23 to lock the cam in its operative mode. <IMAGE>

Description

SPECIFICATION Lockable bolt This invention relates to lockable bolts, especially lockable shoot bolts.

According to the present invention a bolt is provided with means to lock it in its extended, operative position by means of a keyoperated lock, for example a pin tumbler lock.

In one aspect the invention provides a lockable bolt which comprises: a spigot housed in a bolt housing and adapted to move relative to the housing between an extended position and a retracted position; retaining means having a releasable operative mode in which it serves to retain the spigot in said extended position; a key-operated lock operatively connected to the retaining means to lock said means in its operative mode.

The lock is conveniently a key-operated pin tumbler lock carried by the bolt housing. Said retaining means, in a preferred form of the invention is a cam or like member which, in its operative position or mode, protrudes into the bolt housing so as to prevent withdrawal of the bolt spigot, either completely or at least to a -sufficient extent to prevent the leading end of the bolt from disengaging from its associated securement means.

Where the lock is a pin tumbler lock the cam or like member is conveniently carried by or directly associated with the cylinder or barrel of the lock; for example the cam can be formed integrally with the cylinder or barrel so that, upon rotation of the cylinder on its longitudinal axis, the cam is rotated so as to move into its operative position. Corresponding opposite movement of the cylinder or barrel (and accordingly the cam or like member) results in the cam being withdrawn from said operative position.

Although the invention is described below with particular reference to a retaining means which is wholly mechanical, it will be appreciated that the retaining device can be in other form.

Where the lock is of the pin tumbler type the key will normally be of the toothed type generally provided for pin tumbler locks. However, the key can take any convenient form; for example, it can be a strip of tough plastics material carrying one or more indicia to be read by the lock.

There is now described, by way of example and with reference to the accompanying drawings, a bolt according to a preferred embodiment of the invention.

In the drawings: FIGURE 1 is a front elevation (part in section) of the bolt; FIGURE 2 is a view of the underside of the bolt; and FIGURE 3 is an end elevation of the bolt.

The bolt includes a bolt spigot 10 having secured thereto a pin handle 11 and housed in housing 12 within which it is slidable between an extended, operative, position and a retracted position. The housing 12 comprises a channel-shaped plate 13 having a centrally disposed channel portion 13.1 the sides of which lead respectively into two flanges 13.2, 13.3 each of which is provided with fixing holes 13.4 by means of which the bolt may be secured, for example, to a door. The housing channel portion 13.1 has formed therein a longitudinally extending slot 14 which permits travel of pin 11 to move the bolt spigot between its extended and retraced positions, and associated transverse slots 15, 16 to accommodate the pin when the spigot is in its extended position. The housing is closed at one end by end cap 17.

In the drawings the bolt is shown in its extended position protruding from bolt housing 32, its adjacent end portion being accom modtated in a securement housing 18 which has substantially the same cross section as housing 12. Securement housing 18 is closed at one end by an end cap 19 and is provided with fixing holes 20 by means of which it may be secured, for example, to a door frame.

Bolt housing 12 carries a barrel lock as sembiy 20 which comprises a block 21 attached to bolt housing 12, for example by means of screws or welding, and having formed therein a cylindrical recess which accommodates lock barrel 22. In this preferred embodiment the lock can be of a known pin tumbler type operable by a suitable key.

The lock barrel 22 carries a retaining means in the form of a cam 23 which can be moved to and from an operative position by rotation of the lock barrel by means of the key. The cylindrical recess of block 21 has an auxiliary recess extending radially thereof to accommodate cam 23 when the latter is in its inoperative position. To accommodate the cam in its operative mode housing 12 has a short longitudinally extending slot to pass the cam.

Thus, in its operative position the cam extends through the wall of the housing into the spigot-receiving channel of housing 12. Contrary movement of the lock barrel by means of the key results in the cam being retracted through the slot, thereby freeing the spigotreceiving channel and permitting the spigot, by means of pin 11, to be moved along the channel and thereby to disengage from securement housing 18.

Operation of the bolt starting with the spigot in its withdrawn, inoperative position is as follows. The door to which the bolt is secured is shut thereby bringing into alignment the bolt housing 12 and the securement housing 18.

The shank of the handle pin 11 is then aligned with the longitudinal slot 14 and, using the pin, the bolt spigot is moved into its extended position, the leading end of the spigot thereby engaging the spigot-receiving channel of securement housing 18. The bolt can then be locked in position by turning lock barrel 22 by means of its key, thereby causing cam 23 to turn with the barrel, to protrude through the slot in housing 12 and to come to rest immediately behind the trailing end of spigot 10. In this position retraction of the spigot in its housing is prevented by cam 23 and the bolt is thereby locked in position. To disengage the bolt spigot from securement housing 18 lock barrel 22 is turned, by means of the key, in the reverse direction, thereby withdrawing cam 23 through the slot in housing 12 and permitting the bolt spigot to be returned to its retracted position using pin handle 11. Once the leading end of the spigot disengages from securement housing 18 the door may then be opened.

Claims

1. A lockable bolt which comprises: a spigot housed in a bolt housing and -adapted to move relative to the housing between an extended position and a retracted position; retaining means having a releasable operative mode in which it serves to retain the spigot in said extended position; and a key-operated lock operatively connected to the retaining means to lock said means in its operative mode.

2. A lockable bolt according to Claim 1, in which the lock is a pin tumbler lock.

3. A lockable bolt according to Claim 1 or 2, in which said retaining means is a cam or like member which, in its operative position or mode, protrudes into the bolt housing so as to prevent retraction of the bolt spigot.

4. A lockable bolt according to Claim 2 or 3, in which the cam is arranged so as to move in conjunction with the cylinder of the lock.

5. A lockable bolt according to Claim 2 or 3, in which the cam or like member is conve niently carried by or directly associated with the cylinder or barrel of the lock.

6. A lockable bolt according to Claim 5, in which the cam is formed integrally with the cylinder or barrel of the lock so that, upon rotation of the cylinder or barrel on its longitu dinal axis, the cam is rotated so as to move into its operative position.

7. A lockable bolt according to Claim 4, in which the cam has a peripheral arcuate sur face and the bolt spigot has a chamfer at its trailing end to abut said surface and thereby when the cam is in its operative mode to prevent retraction of the bolt.

8. A lockable bolt according to Claim 1, substantially as described herein with refer ence to the accompanying drawings.

9. A lockable bolt substantially as described herein and substantially as shown in the accompanying drawings.