GB2241730A

GB2241730A - Security bolt

Info

Publication number: GB2241730A
Application number: GB8925986A
Authority: GB
Inventors: Hamish Miller
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-11-17
Filing date: 1989-11-17
Publication date: 1991-09-11
Also published as: GB8925986D0

Abstract

A sliding action security bolt has a hinged slide which automatically restricts the opening of a door or window. A "T" bar 22 hinged at 28 is retained within guides 24, 25 at all times to allow limited opening until released by the operation of a spring loaded catch 26. The action of closing the door or window automatically moves the hinged bar 22 in the guides and the final sliding action of a bolt 16 into socket 27 secures the door or window. <IMAGE>

Description

SLIDING BAR SECURITY CATCH THIS INVENTION RELATES TO A SLIDING DOOR CATCH WHICH INCLUDES A RELIABLE INBUILT DEVICE FOR LIMITTING THE EXTENT THF:. DOOR TO WHICH IT IS FITTED, MY BE OPENED UNTIL IT IS DESIRED TO DO SO Prior art describes many devices for limiting the extent to which the conventional entrance dorrs to residential homes er other premisez may be opened.

These ma@nly consist of an additional fitting other than the lock or main method of securement.

In some instances a strong link chain can be looped over a @@@@b placed projection to limit the opening of a door to that space or gap necessary only to identify the person @@tside. In such cases it is necessary to close the door again to release the chain.

Should forcible entry be intended, then the chain could be cut through by suitable metal shears.

It effect then this form of restraint has but limited value.

Other forms of security will include a 'spy' hole in the door so that the person within may vieww the person without, befere opening the door.

SLIDING BAR SECURITY CRTCH When aus person within has committed him or herself to opening the door it is not too difficult to gain entry whether that person is welcome or not.

According to the present invention there is provided a sliding latch security catch which is in two part but joined together in such a manner that when required the door may only be opened a fixed amount and the means ot restraint is not visible to the person outside the door.

The normal operation of the catch is that it will slide within captive 'gates to secure the door closed. It can be slid back from the captive gates to open the door in the normal manner. or it can be manipulated to ensure that the door will open only a fixed amount. This manoeuvre would probably be performed during the evening or when the resident may or hersolf be alone in the house.

In circumstances when the door is to be opened under restraint conditions the latch is slid back sufficiently to release it from the captive 'gates' and no matter what effort is applied to the door from outside it will not open beyond the limit imposed by the upper half of the two-part security catch.

a release mechanism automatically enables the upper half of the catch to hinge backwards and allows the door to open a fixed distance and no further. The restraint device cannot be seen by the person outside the door.

SLIDING BAR SECURITY CATCH A specific embodiment of the invention will now be described by way of example only, with reference to the accompanying drawings in which : Figure 1 is a perspective view of the sliding door catch with the latch captive.

Figure 7 shows the sliding catch disengaged.

pure illustrates components of the sliding door catch In more detail.

Figure 4 snows the sliding door catch fitted to a door.

The sliding door catch is in two sections - the portion 10 whach is @@@dly secured to the door and section 11 which is fixed@, secured to the door frame.

Section 10 comprises of the base element 13 which has the normal countersunt screw holes 14, provided - six in number @although the number would relate to the degres of attachment required.

Two side quide strips 15 extend form the upper side of the base element 13 which provides containment from sidewavs movement for the slide bar 16. Slide bar 16 is rectangular in shape throughout the length of the bar but is upturned at Fi@ht angles at one end. The upturned end 17 provides for manual movement of the slide bar 16 between the slide guide s@@@ps 10 as well as limiting the extent of slide bar travel SLIDING BAR SECURITY CATCH in a horizontal direction. The upturned end 17 can be any shape as well as that illustrated or can comprise any added feature to suit an aesthetic desire.

Movement towards the right side is limited by contact with the bridge 18 spannig the two guide strips 15 and movement to the left is limited by contact with an upturned stop 19 at the left extremity of the base element 13.

The slide bar 18 travels horizontally towards the right side in the illustration shown in Figure 1 and extends over section 11, Beneath slide bar 16 and fully hidden by it in Figure 1 except for two circular lugs 20 and 21 is the security bar 22. (See Figures 2 and 3).

Security bar 22 is pivotally linked with the base element 13 by a joint pin 23. (Figure 31. It lies flat within the two side quides 24 and 25 of section 11 (see subsequent text) and is releazably secured in the locked position by a spring-loaded catch 26.

The security bar 22 is to al 1 intents and purposes part of section 10 and is hinged to the base element t 1.'. The said security bar is "T" shaped at the "catch" end which is the right side in the illustration Figure 1.

the two "T" extensions 20 and 21 are circular lugs which can @lies freely within the two side quides 24 and 25 of section 11.

SLIDING BAR SECURITY CATCH It will be obvious that as the two circular lugs slide within the two side guides 24 and 25 that movement of the door to which base element 1 is attached will be limited to the movement afforded by the amount of horizontal traverse along separate side-quides 24 and 25.

The slide bar 16 can be manually moved horizontally along the side quides 15 and the two side quides 24 and 25 in section 11 to engage with and pass under the locking bridge Ir; r that position the door is secured to the frame and cannot be released from the exterior of the door.

On sliding the slide bar 16 towards the left direction towards end along section 10 the door may be opened inwards only at fat as securtiy bar 22 permite because, as the door moyes beckwards it draws the two circular lugs 20 and 21 along within the side quides 24 and 25.

TO release the door to open fully, the spring catch 26 is depressed which ; in in turn release circular lug 21 and in consequence the security bar 22 does not enter the side quides 24 and 25. No claims to originality is entered for the spring catch 26 since this is the subject of known prior and @@ an, other type of release mechanism could be incorporated in the embodiment.

SLIDING BAR SECURITY CATCH The assurance that the security bar 22 gives to the householder against unwanted entry into the premises is very considerable because the gap opened betwenn door and frame is too small to accept bolt-croppers and the section of metal which would have to be sheared is too great for any known hand-held version.

Reference to Figure 2 shows the slide bar 16 moved towards the left against upturned stop 19.

This position of slide bar 14 reveals the pivot point 28 which links the fixed position of base element 13 of section 10 which the security bar 22.

The pivoted point 28 comprises two rounded lugs 29 and a pivot lug 30. The three said lugs pivot on pivot pin 23.

In the position illustrated in Figure 2 the spring-loaded catch 28 exterds over the lower circular lug 21 keeping it captive within gap 31 and allowing only lateral movement of the circular lugs 20 and 21.

When spring-loaded catch 26 is manually depressed it releases circular lug 21 to move vertically outwards and not within the side quide 24.

When circular lug 21 moves vertically outwards the door is free to open. When spring-loaded catch 26 is not manually depressed the two circular lungs 20 and 21 can only move within the confines of side quides 24 and 25 - that is horizontallyl SLIDING BAR SECURITY CATCH The material with which the SLIDING BAR SECURITY CATCH is constructed can be varied to suit the aesthetic tastes of the house resident but can be in electro-plated steel, brass, bronze, stainless steel, galvanised steel, or burnished steel and painted.

The he type of material need bear no relationship to the concept incorporated in this embodiment.

Referrans to Figure 3 the detail of the various components comprisind the "security catch" ar-e emphasised to illustrate fe@@ures which may not have been visible in the previous Figures 1 and 2.

In particular the section 11 (View 3a) is shown at an angle which reveale the shape of side quides 24 and 25, as well as the @@@@ br@due 27.

The @@ew also shows the gap 31 in which the security bar 22 with the two circular lugs 20 and 21 normally remain captive.

'he- two s side guides 24 and 25 are right angle sections formed by a vertical upright and a horizontal cap piece.

Une wend of the right angle section is open and the other is closed. The closed end is towards the left side of the section 11 and is so provided to limit the travel of the two circular lugs 20 and 21.

SLIDING BAR SECURITY CATCH When the two said circular lugs reach the end of the two side guides 24 and 25 that is the limit of opening for the door.

Figure (view b) shows the security bar 22 removed from the base element 13 and illustrates the pivot lug 30 with the hole for pivot pin ?3 The general shape of the security bar 22 is rectangular with the two circular lugs 20 and 21 forming a "T" sphape at the end remote from the pivot lug 30. The width, of the bar section fits freely betwenn the two side guides 24 and 25 and the two circular lugs 20 and 21 are of appropriate dimensions to move freely inside the said side guides.

The change of shape from the flat rectangular section of the security bolt 22 to the circular shape of the lugs 20 and 21 provides a smooth radius which induces the lugs to slide into the two side quides 24 and 25.

The spring loaded catch 26 is shown as View 30 and compresses a short square section box 32 which houses a sliding catch 33 which rests against a coiled compression spring that tends to force the catch 33 in a vertical direction.

The catch 33 can be manually depressed against the coiled spring by the flat lever 34 which is fixedly attached to the catch 33. The extent of movement of the catch 33 is lim@bed by the cut-away gap 35 in the box section 32. SLIDING BAR SECURITY CATCH 1 he separated view of section 10 indicates the construction of base element 1 and shows the raised portion comprising the upturned slide bar stop 1 and the bridge 18.

This said bridge provides the locking element between the door and it frame when the slide bar 16 is engaged within bridge 18 and locking bridge 27.

No other aspects of the SLIDING BAR SECURITY CATCH need further descraption than that already provided in this s it je a @eature of the embodiment that the SLIDING BAR SECURITY CATCH can be modified so that it may be operated by leit-handed persons or on a left hand opening door. The concept remains the same and night necessitate the positioning of the catch 26 above and not below the bar 16.

Claims

SLIDING BAR SECURITY CATCH THIS INVENTION RELATES TO n SLIDING DOOR CATCH WHICH INCLUDES A RELIABLE INBUILT DEVICE FOR LIMITING THE EXTENT THE DOOR TO WHICH IT IS FITTED, MAY BE OPENED UNTIL IT IS DESIRED TO DO SO.

Prior art describes many devices for limiting the extent to which the conventional entrance doors to residential homes or other premises may be opened.

These mainly consist of an additional fitting other than the lock or main method of securement.

In some instances a strong link chain can be looped over a suitably placed projection to limit the opening of a door to that space or gap necessary only to identify the person outside. In such cases it is necessary to close the door -again to release the chain.

Should forcible entry be intended then the chain could be cut through by suitable metal shears.

In effect thens this form of restraint has but limited value.

Other forms of security will include a 'spy' hole in the door so that the person within may view the person withouts before opening the door.

SLIDING BAR SECURITY CATCH When the person within has committed him or herself to opening the door it is not too difficult to gain entry whether that person is welcome or not According to the present invention there is provided a sliding latch security catch which is in two parts but Joined together in such a manner that when required, the door may only be opened a fixed amount and the means of restraint 15 not visible to the person outside the door.

The normal operation of the catch is that it will slide within captive 'gates' to secure the door closed. It can be slid back from the captive gates to open the door in the nornsal manner, or it can be manipulated to ensure that the door will open only a fixed amount. This manoeuvre would probably be performed during the evening or when the rez5ident may him or herself be alone in the house.

In circumstances when the door is to be opened under restraint conditions the latch is slid back sufficiently to release it from the captive 'gates' and no matter what effort is applied to the door from outside it will not open beyond the limit imposed by the upper half of the two-part security catch.

a release mechanism automatically enables the upper half of the catch to hinge backwards and allows the door to open a fied distance and no further. The restraint device cannot be seen by the person outside the door.

SLIDING Bt SECURITY CATCH specific embodiment of the invention will now be described by way of example only, with reference to the accompanying drawings in which Figure l is a perspective view of the sliding door catch with the latch captive.

Figure 2 shows the sliding catch disengaged.

Figure 3 illustrates components of the sliding door catch in more detail.

Figure 4 shows the sliding door catch fitted to a door.

The sliding door catch is in two sections - the portion 10 which is fixedly secured to the door and section 11 which is fixedly secured to the door frame.

Section 1 comprises of the base element 13 which has the normal countersunk screw holes 14 provided - six in number -although the number would relate to the degree of attachment required.

Two side guide strips 15 extend from the upper side of the base element 1.3 which provides containment from sideways movement for the slide bar 16. Slide bar 16 is rectangular in shape throughout the length of the bar but is upturned at right angle at one end. The upturned end 17 provides for manual movement of the slide bar 16 between the slide guide strips 15 as well as limiting the extent of slide bar travel SLIDING BAR SECURITY CTCH In a horizontal direction. The upturned end 17 can be any shape as well as that Illustrated or can comprise any added feature to suit an aesthetic desire.

Movement towards the right side is limited by contact with the bridge 18 spinning the two guide strips 15 and movement to the left is limited by contact with an upturned stop 19 at the left 0 extremity of the base element 13.

The slide bar 16 travels horizontally towards the right side iri the illustration shown in Figure 1 and extends over section 11, Beneath slide bar 16 and fully hidden by it in Figure 1 except for two circular lugs 20 and 21 Is the security bar 22. (See Figures 2 and 3).

Security bar 22 is pivotally linked with the base element 13 by a Joint pin 23. (Figure 3). It lies flat within the two side quides 24 and 25 of section 11 (see subsequent tt) and is releasably secured in the locked position by a spring-loaded catch 26.

The security bar 22 is to all intents and purposes part of section 10 and is hinged to the base element 13. The said security bar is "T" shaped at the "catch" end which Is the right side in the illustration Figure 1.

The two "T" extensions 20 and 21 are circular lugs which can slide freely within the two side guides 24 and 25 of section 11.

SLIDING BAR SECURITY CATCH It will be obvious that as the two circular lugs slide within the two side guides 24 and 25 that movement of the door to which base element 13 is attached will be limited to the movement afforded by the amount of horizontal traverse along separate side-gLlides 24 and 25.

The slide bar 16 can be manually moved horizontally along the side guides 15 and the two side guides 24 and 25 in section 11 to engage with and pass under the locking bridge 27.

In that position the door is secured to the frame and cannot be released from the exterior of the door.

On sliding the slide bar 16 toward the left direction towards and along section 10 the door may be opened inwards only as far as security bar 22 permits because as the door moves backwards it draws the two circular lugs 20 and 21 along within the side guides 24 and 25.

To release the door to open fully3 the spring catch 26 is depressed which in turn release circular lug 21 and in consequence the security bar 22 does not enter the side guides 24 and 25. No claims to originality is entered for the spring catch 26 since this is the subJect of known prior art any other type of release mechanism could be incorporated i the embodiment.

SLIDING BAR SECURITY CRTCH The assurance that the security bar 22 gives to the householder against unwanted entry into the premises is very considerable because the gap opened between door and frame is too small to accept bolt-croppers and the section of metal which would have to be sheared is too great for any known hand-held version.

Reference to Figure 2 shows the slide bar 16 moved towards the left against upturned stop 19.

This position of slide bar 16 reveals the pivot Joint 28 which links the fixed position of base element 13 of section 10 with the security bar 22.

The pivoted joint 28 comprises two rounded lugs 29 and a pivot lug t. The three said lugs pivot on pivot pin 23.

In the position illustrated in Figure 2 the spring-loaded catch 26 extends over the lower circular lug 21 keeping it captive within gap 31 and allowing only lateral movement of the circular lugs 20 and 21.

When spring-loaded catch 26 is manually depressed it releases circular lug 21 to move vertically outwards and not within the side guide 24.

When circular lug 21 moves vertically outwards the door is free to open. When spring-loaded catch 26 is not manually depressed the two circular lugs 20 and 21 can only move within the confines of side guides 24 and 25 - that is horizontally! SLIDING BAR SECURITY CRTCH The material with which the SLIDING BAR SECURITY CATCH is constructed can be varied to suit the aesthetic tastes of the house resident but can be in electro-plated steels brass, bronze, stainless steel, galvanised steel, or burnished steel and painted.

The type of material need bear no relationship to the concept incorporated in this embodiment.

Referring to Figure 8. the detail of the various components comprising the "security catch" are emphasised to illustrate features which may not have been visible in the previous Figures 1 and 2.

In particular the section 11 (View 3a) is shown at an angle which reveals the .shape of side guides 24 and 25, as well as the lock bridge 27.

This view also shows the gap 31 in which the security bar 22 with the two circular lugs 28D and 21 normally remain captive.

The two side guides 24 and 25 are right angle sections formed by a vertical upright and a horizontal cap piece.

One end of the right angle section is open and the other is closed. The closed end is towards the left side of the section 11 and is so provided to limit the travel of the two circular lugs 20 and 21.

SLIDING BAR SECURITY CATCH When the two -aid circular lugs reach the end of the two side guides 24 and 25 that is the limit of opening for the door.

Figre 3 (view 3b) shows the security bar 22 removed from the base element 13 and illustrates the pivot lug 30 with the hole for pivot pin 23.

The general shape of the security bar 22 is rectangular with the two circular lugs 20 and 21 forming a "T" shape at the end remote from the pivot lug 30. The width of the bar section fits freely between the two side guides 24 and 25 arid the two circular lugs rvo and 21 are of appropriate dimensions to move freely inside the said side guides.

The change of shape from the flat rectangular section of the security bolt 22 to the circular shape of the lugs 20 and 21 provides a smooth radius which induces the lugs to slide into the two side guides 24 and 25.

The spring loaded catch 26 is shown as View 3c and compresses a short square section bo 32 which houses a sliding catch 33 which rests against a coiled compression spring that tends to force the catch 33 in a vertical direction.

The catch 3-3 can be manually depressed against the coiled spring by the flat lever 34 which is fixedly attached to the catch 33 The extent of movement of the catch 33 is limited by the cut-away gap 35 in the box section 32.

SLIDING BAR SECURITY CATCH The separated view of section 10 indicates the construction of base element 1 and shows the raised portion comprising the upturned slide bar stop 19 and the bridge 18.

This said bridge provides the locking element between the door and its frame when the slide bar 16 is engaged within bridge 18 and locking bridge 27.

No other aspects of the SLIDING BAR SECURITY CATCH need further description than that already provided in this specification.

It Is a feature of the embodiment that the SLIDING BAR SECURITY CATCH can be modified so that it may be operated by left-handed persons or on a left hand opening door. The concept remains the same and might nece=-sitate the positioning of the catch 26-abov and not below the bar 16. SLIDING BE SECURITY CATCH CLAIMS 1) A sliding bar security catch with sliding section hinged to allow limited opening of a door or window while retaining full locking action.
2) A sliding action security catch as claimed in claim 1) which allows the hinged "T" catch to return to its secure position within the angle guides so that it is fully re-locked on the action of pushing thw door or window closed
3) A sliding action security catch as claimed in Claim 1 and Claim 2 which provides a spring loaded mechanism to release the t2t catch end from the angle guides to enable the dooror window to open freely when the operator requires.