GB2271379A - Security bolt for sliding doors and the like. - Google Patents

Abstract

A sliding member security lock incorporating a bolt 3 which is located within a fixed sleeve 12 in the inner sliding member and a screwed thread in a sleeve 11 in the outer sliding member. The head of the bolt is either a) a "cap" head screw design (i.e. hexagon socket) or b) of a knurled design, so making either a) a disassembling tool necessary to remove the bolt or b) can be removed by hand. There are two alternative inner sleeves; a countersunk version which is used with the cap head bolt or a flush flange version which is used with the knurled bolt. Mis-alignment of the device is overcome by allowing a clearance between the inner sleeve and the bolt. <IMAGE>

Description

SLIDING MEMBER SECURITY BOLT This invention relates to a sliding member security bolt.

Security of sliding members is a widespread problem. Sliding members are commonly located on runners which provide little inherent security.The usual security systems available to lock the sliding members involve latches, springs, levers, snapbolts and are generally complicated, both in operation and installation.

According to the present invention, security of the sliding member is provided by inserting a bolt through a sleeve in the inner member which screws into a threaded sleeve in the outer member. The head of the bolt is of a hexagonal "Cap" head type, knurled externally. There are two alternative inner sleeves into which the bolt fits. The first is countersunk so that the bolt head is inaccessible and the other fitted flush so that easy bolt removal is possible.

For solid sliding members, location of the sleeves is by interference fit and for hollow sliding members, location of the sleeves is by a bonding agent and a slightly increased size of the diameter of the sleeves flange.

The surface of the sleeves can be machined to modify the surface finish in a way as to increase the effective roughness to allow a more secure fit.

Allowance for the mis-alignment of the sliding members is provided by the clearance of the bolt and the inner sleeve.

The lock is unobtrusive, is fitted in one simple drilling operation and much more aesthetically pleasing than presently marketed devices.

It is possible to fit this lock after the sliding member is installed and therefore is not reliant on fitting at the manufacturing or installing stage.

A specific embodiment of the invention will now be decided by way of example with reference to accompanying drawing in which: Fig 1 Shows in section the disassembled Security Bolt incorporating parts 11,12 (countersunk inner sleeve) and 13.

Fig la Shows in section the inner sleeve (flush fitting type).

Fig 2 Shows in section the assembled Security Bolt incorporated in a solid sliding member, parts 14,15.

Fig 3 Shows a perspective view of the installed bolt in a sliding member.

The bolt (13) in fig 1 consists of a bolt of suitable length with a hexagonal "cap' head . The bolt (13) fits through the inner sleeve (12) and screws into the outer threaded sleeve (11) The sleeves are installed in the sliding members as in fig 2.

The inner sleeve (12) is fitted into the inner sliding member (15) and the outer threaded sleeve (11) is fitted into the outer sliding member (14).

The bolt (13) passes through the inner sleeve to lock the sliding members together by screwing it into the outer threaded sleeve (11). The head of the bolt (13) either countersinks into the inner sleeve (12) or abuts against the flange of the inner sleeve (fig.la part 12a).

Removal/replacement of the bolt is with either a hexagonal profiled key (not shown) or by hand.

Claims (14)

1. A simple security device which prevents both sliding and lateral movement of sliding members.

2. A simple security device as claimed in claim 1 with provision for sliding member mis-alignment by incorporation of a clearance between the bolt and the inner sleeve.

3. A simple security device as claimed in claim 1 or claim 2 with a countersunk head of the bolt to prevent removal without the disassembling tool.

4. A simple security device as claimed in claim 3 with a smooth profile of body of inner and outer sleeve to allow installation with one drilling operation.

5. A simple security device as claimed in claim 4 with an adapted surface finish of inner and outer sleeve to increase the degree of interference within the body of the sliding members.

6. A simple security device as claimed in any preceding claim with an increased diameter of the sleeves flanges to allow a larger bonding area for use with hollow sliding members.

7. A simple security device as claimed in any preceding claim of unobtrusive design having little interference with the sliding members appearance.

8. A simple security device as claimed in any preceding claim where the length of sleeve is such that adaptation for differing width sliding members is simply achieved by removing excess length.

9. A simple security device as claimed in any preceding claim which can be retrofitted to existing sliding members , not necessarily requiring to be fitted at the sliding members manufacturing or installation stages.

10. A simple security device as claimed in any preceding claim with a flush fitting flange on the inner sleeve to facilitate ease of removal.

Amendments to the claims have been filed as follows 1. A simple security device requiring only three parts to effect both sliding and lateral security of sliding members.

2. A simple security device as claimed in claim 1 specifically designed for opening of sliding members from the inside only.

3. A simple security device as claimed in claim 1 or 2 with provision for sliding member mis-alignment by incorporation of a clearance between the bolt and the inner sleeve.

4. A simple security device as claimed in claim 3 requiring no jigs for installation and may be fitted in only one simple drilling operation.

5. A simple security device as claimed in claim 4 whose sleeves have an adapted surface finish to give interference fit, allowing frictional locking into the frame of the sliding member but whose external profile is smooth enough to allow removal or replacement, with little risk of causing damage to the frame of the sliding member.

6. A simple security device as claimed in any preceding claim where the adhesion of the sleeves into the frame is not a critical consideration to the inherent security of the device in both sliding and lateral movement of the sliding members.

7. A simple security device as claimed in any preceding claim with an increased diameter of the sleeves flanges to allow a larger bonding area for use with hollow sliding members.

8. A simple security device as claimed in any preceding claim where the length of the sleeve is such that adaptation for differing width sliding members is simply achieved by removing excess length.

9. A simple security device as claimed in any preceding claim that does not interfere with, or obscure the profile of the aperture or cause obstacle,by virtue of its discreet, unobtrusive profile and positioning.

10. A simple security device as claimed in any preceding claim which can be retrofitted to existing sliding members, not necessarily requiring to be fitted at the sliding members, manufacturing or installation stages.

11. A simple security device as claimed in any preceding claim with an exposed outer flanged sleeve, making a visible deterrent to intruders.

12. A simple security device as claimed in any preceding claim, with a knurled bolt head to allow quick removal by hand in case of emergency evacuation through sliding member aperture.

13. A simple security device as claimed in any preceding claim with a knurled bolt head designed especially for frequent and easy removal and replacement.

14. A simple security device as claimed in any preceding claim with a countersunk head of the bolt to prevent removal without a disassembly tool.