GB2064633A - Lockable Rotary Dead Bolt Fastener - Google Patents

Abstract

A lockable fastener for securing a window casement within a window frame comprises a mounting plate 18, a handle 10 pivotally mounted on the plate and a lock barrel 20 mounted for rotation in the handle, rotation of the lock causing rotation of a formation 22 thereon in to or out of a position where it restricts pivotal movement of the handle with respect to the plate by engagement with the plate or with a complementary formation thereon. <IMAGE>

Description

SPECIFICATION Locking Window Fastener This invention relates to window locking latches or casement fasteners of the type for locating and securing or locking a window casement in a closed or partially closed position within a window frame in which the casement is located.

The particular type of fastener with which the present application concerns itself is one which will provide a degree of security against intrusion by incorporation of a lock assembly. With conventional non-locking fasteners it is possible merely by breaking the window for a would-be intruder to pivot the fastener handle relative to its mounting plate and the window casement and thereby gain access to the building. The incorporation of a security lock in the fastener enables the fastener handle to be secured in position relative to its mounting plate and window casement so that an intruder cannot free the casement from its frame without use of the appropriate key or equivalent, or further force.

There have been many suggestions in the past for a construction of locking window fasteners using a variety of locking assemblies and placement thereof in relation to the fastener.

Many prior suggestions involve the complexity of security type locks wherein operation of the lock by a key or equivalent produces linear movement of a bolt into or out of engagement with a cooperating formation to prevent movement of the fastener handle relative to its mounting plate. On the other hand proposals have been made for a simple screw arrangement wherein rotation of the screw with some form of key causes a stud to move axially into engagement with a complimentary formation again to prevent movement of the handle relative to its mounting plate. The former arrangements suffer from a degree of complexity which of course reflects itself in the cost of the fastener whereas the latter, while capable of being produced at low cost, are significantly less secure.

It is an object of the present invention to produce a locking window fastener having the advantages of a security type lock while at the same time being simple and less costly to produce.

According to the present invention a window locking fastener comprises a mounting plate, a handle pivotally mounted on the plate and a lock mounted for rotation in the handle, rotation of the lock causing rotation of a formation thereon in to or out of a position where it restricts pivotal movement of the handle with respect to the plate by engagement with the plate or with a complementary formation thereon.

The mounting plate may be of conventional form for attachment to wood or metal window casements, or indeed to equivalent arrangements such as cupboard doors or the like where a degree of security may be required, the mounting plate being provided as necessary with means for affixation to the wood or metai e.g. wifn appropriately positioned screw holes. The handle should be attached to the mounting plate by a pivot pin or the like in a permanent fashion, there being, if desired, means for adjustment of the friction between the two. The lock may be mounted at or adjacent the pivot axis but is preferably spaced therefrom, the axis of the lock assembly preferably being parallel to the pivot axis. In a further embodiment the axis of the lock assembly may be other than parallel to the pivot axis, for example at right angles to the pivot axis.

The lock may be a barrel or plug type lock of cylindrical form having a key hole at its outer end, the lock being fixed for prevention of longitudinal movement relative to the handle but at the same time being free for rotation about its axis relative to the handle unless constrained from such rotation by engagement of locking pins or the like as is conventional.

The lock assembly has a formation thereon which may be an eccentric pin integral with or attached to the lock barrel at its end remote from the key inlet, the eccentricity of the pin being such that in a first locked position the handle may rotate freely in relation to the mounting plate, the pin being substantially free of contact with the plate, and in a second locking position the arc of the pin about the handle pivot axis is obstructed by contact of the pin with the plate or a complementary formation, for example protrusion, thereon. Thus rotation of the lock assembly causes a formation or element of the lock assembly to rotate into or out of a position where pivotal movement of the handle with respect to the plate is restricted.

The restriction may be by engagement of the respective formations thereby positively locating the handle in one position in respect to the mounting plate or in the alternative may be by simple obstruction for example of a protrusion of the mounting plate whereby the handle is prevented from moving beyond a certain point in its arc of travel. The latter arrangement may be simple and effective as it will be appreciated that a catchpart will be provided on the handle for engagement with a catchpiece to be located on the window frame, engagement of the catchpart and catchpiece effectively preventing further rotation of the handle in one sense, the protrusion or the like on the base plate being disposed such that movement of the handle in the opposite sense is prevented to ensure that the handle cannot be moved to disengage the catchpart and catchpiece.

It will be appreciated that although the invention is described in relation to a fastener having a mounting plate and handle assembly to be attached to the window casement and a catchpiece to be mounted to the window frame, the arrangement could as easily be reversed without departing from the present invention.

Furthermore while the above has concerned itself with the use of a key or the like implement it will be appreciated that other forms of locking, for example using a combination lock rather than a key, or by using a manually rotatable element to which a security lock may be attached would be equally within the spirit of the invention.

The invention may be performed in various ways and a specific embodiment will now be described with reference to the accompanying drawings in which Figure 1 shows a sectional view of a handle embodying the present invention the section being taken along the line AA of Figure 2, Figure 2 being a view of a handle on a mounting plate Figure 1 (a) shows a side view of a locking plug for insertion in the handle of Figures 1 and 2. Figures 1 (b) and 1(c) are end views of the plug of Figure 1 (a) from directions B and C respectively, Figure 3 is a plan view of the mounting plate the handle having been removed therefrom and Figure 4 is a side view of the mounting plate of Figure 3.

Referring to the drawings Figures 1 and 2 show a handle 10 comprising a pivot hole 12, a lock receiving hole 14 and a catchpart 1 6 for engagement with a catchpiece (not shown) on, for example, a window frame.

The handle 10 is attached via a pivot bolt 1 3 to a mounting plate 1 8 such that the handle may be freely pivoted about the bolt 13 with respect to the mounting plate 18.

With the mounting plate 1 8 affixed on the casement of a window, the window may be held in a closed position relative to its frame by engagement of the catchpart 16 with a catchpiece on the windowframe, the window being releasable for opening by pivoting the handle 10 relative to the mounting plate 18 in an anti-clockwise direction as shown in Figure 2 to release the catch part 16 from engagement with its complementary catchpiece on the windowframe.

The lock receiving hole is adapted to receive a barrel lock 20 such as shown in Figures 1(a), (b) and 1 (c) the lock being formed with an eccentric pin 22 at one end and a key hole 24 at its other end. Operation of the key will raise or lower the tumbler pins 30 of the lock according to the position of the key relative to the locked tumblers, the pins 30 being received in grooves 32 in the interior of the hole 14 to hold the lock 20 relative to the handle 10. When the pins 30 are retracted into the body of the lock 20 the lock 20 is itself free to rotate relative to the handle 10.

The mounting plate 18 is provided with means 36 by which the pivot bolt 13 may be attached to the mounting plate 1 8. The mounting plate is also provided with screw holes 40 and 42 for securement of the mounting plate 18 to a window casement or the like. A protrusion 50 stands proud of the upper surface of the mounting plate 1 8 in a position within the area swept by the lock 20 as it pivots in the handle around pivot pin 13. The protrusion 50 is located such that with the lock 20 in one position the pin 22 and the protrusion 50 obstruct one another to prevent the handle being-moved in an anti-clockwise direction from the position shown in Figure 2 thus preventing release of the fastener to open the window.When the lock 20 is rotated by use of the key the pin 22 will move away from the protrusion 50 so that their relative paths of movement do not coincide and the handle 10 is free to rotate relative to the mounting plate 18.

On Figure 4 there is shown a lock 20 in the position it would be were the handle 10 in place on the mounting plate 18 showing the obstruction of the pin 22 by the protrusion 50.

When the lock is rotated through 1 80C the pin will be in the position shown at 22' allowing free movement of the handle 10 relative to the mounting plate 18.

It will be appreciated that the cylinder pins 30 can be located in either groove 32 to hold the lock 20 and consequently the pin 22 in one or other of the positions referred to in relation to Figure 4.

A further protrusion 60 is shown on Figure 1 this co-operating with a recess 62 in the mounting plate 1 8 permanently to restrict movement of the handle relative to the mounting plate in a clockwise direction thus preventing the handle being forced in a clockwise direction to the point where the window may be opened.

In a further embodiment (not shown) the lock 20 may be located laterally within the handle, i.e.

in the area 14 but in the plane of the paper as shown in Figure 2, there being a radial pin or formation on the edge of the cylinder which engages and disengages with a protrusion 50 in like manner as that described in respect of the pin 22.

Claims (7)

Claims

1. A window locking fastener comprising a mounting plate, a handle pivotally mounted on the plate, and a lock mounted for rotation in the handle, rotation of the lock causing rotation of a formation thereof into or out of a position where it restricts pivotal movement of the handle with respect to the plate by engagement with the plate or with a complimentary formation thereon.

2. A fastener as claimed in Claim 1 wherein means are provided between the mounting plate and the handle for adjustment of the friction between the two.

3. A fastener as claimed in Claim 1 or Claim 2 wherein the axis of the lock assembly is substantially parallel to the pivot axis and spaced therefrom.

4. A fastener as claimed in any of the preceding Claims wherein the said formation of the lock is an eccentric pin.

5. A fastener as claimed in Claim 1 or Claim 2 wherein the lock is substantially coaxial with the pivot axis of the handle.

6. A fastener as claimed in Claim 1 or Claim 2 wherein the axis of the lock is other than parallel to the pivot axis of the handle.

7. A window locking fastener substantially as described herein with reference to the accompanying drawings.