GB2473480A

GB2473480A - A lock for sliding doors and a sliding door arrangement

Info

Publication number: GB2473480A
Application number: GB0916021A
Authority: GB
Inventors: Anthony Lee Hughes
Original assignee: Epwin Group PLC
Current assignee: Epwin Group PLC
Priority date: 2009-09-11
Filing date: 2009-09-11
Publication date: 2011-03-16
Also published as: GB0916021D0

Abstract

A lock for securing together first and second aligned overlapping doors of a sliding door. The lock comprises a pin 18 mounted to a first door 6 for axial movement perpendicular to the plane of the door such that the locking pin can project into a strike 24 mounted in the second door 4. In the extended position the locking pin is movable, e.g. rotated, between a first and second position (orientation); in the second position an engagement portion of the pin such a protruding lug or T-bar 22 engages the strike to prevent the locking pin from being retracted or the doors from being forced apart. In the first position the protruding lug does not engage the strike and the pin can be retracted. Preferably the locking pin is mounted within a cylinder installed within the first door; the locking pin may be spring biased into the retracted position. Two separate locks may be provided in a single door. There may be four door leafs, two of which slide with respect to a respective static door, each pair of door leafs may have a lock.

Description

SLIDING DOORS AND LOCK FOR SLIDING DOORS

The present invention is in the field of sliding doors and locks for sliding doors, particularly, but not exclusively, the invention relates to sliding patio doors.

Patio doors generally comprise one or more transparent leaves, each having a frame disposed around its outer edge.

These frames may comprise top and bottom horizontal sections, which are joined at their extents by upright members to io completely enclose the outside edge of the leaf. The top and bottom horizontal sections are fitted into opposing channels of a close fitting frame. There may be a number of rollers or bearings between the top and bottom horizontal sections and their respective portions of the frame to allow the leaf to slide along the length of the frame.

For example, in a two leaf patio door there may be a fixed leaf and a sliding leaf. In this case the fixed leaf is fixed in position between the top and bottom sections of the frame and one upright side edge of the leaf abuts one side edge of the frame. The sliding leaf is also disposed between the top and bottom sections of the frame, but it is mounted on rollers in channels as described above and can therefore slide between an open position where it fully overlaps the fixed leaf (leaving an aperture for entry), and a closed position where it sits adjacent the fixed leaf, with only a small overlap, to fill said aperture and make the property weather tight and secure.

Unfortunately, patio doors are a common means of entry by burglars, so it is important to fit locks to secure the doors against unauthorized entry.

When a patio door is in the closed position, a upright member of the fixed leaf overlaps a corresponding upright member of the sliding leaf. This overlap is a mechanically weak point of the doors as the uprights are not secured together and entry may be gained to the property by forcing these upright members apart by applying force in a generally s normal or transverse direction to the plane of motion of the sliding leaf.

Conventionally, devices have been designed to strengthen patios doors and make them more resistant to unauthorized forced access. The applicant's earlier application GB2453954, io for example, describes a patio door assembly comprising a blocking member which projects into the gap between the patio door and its frame. The blocking member thus limits upward lifting' of the door within the frame, so that the door cannot be removed from the frame and access gained.

Conventionally, it is also known to provide a pin which extends from the upright member of one leaf into the overlapping upright member of the adjacent leaf, when the door is in the closed position. This pin secures the leaves against sliding but does not secure them against separation of the leaves in the direction generally transverse to the sliding.

It is also known in the art for sliding patio doors to have interlocking tabs on the overlapping upright sections, as shown in figure 1. When the patio door is in the closed position these tabs interlock together to improve the seal.

The interlocking tabs are usually made of aluminium or PVC-U, and whilst they improve weatherproof ing of the doors, they have insufficient strength to secure the door against attack and separation as described above.

It is therefore desirable to design a lock for a patio door which not only offers security in preventing the door from sliding, but also prevents adjacent leaves from being forced apart at their overlapping upright frame sections.

At its most general, the invention provides a lock, comprising a pin and a strike, for securing together two overlapping sections of patio doors the pin having an engagable portion configurable between two configurations, a first where the pin is free to enter and leave the strike, and a second where the pin is locked within the strike to prevent translational movement of the pin.

According to a first aspect, the invention may provide a io sliding door comprising two aligned overlapping leaves, one of the leaves being slidable relative to the other in a first direction to vary the extent of overlapping, and a lock to secure together the two leaves at a predetermined position, wherein the lock comprises a strike on a face of one of the leaves and a pin mounted on the other leaf, the pin having an engagement portion and being movable in a second direction generally transverse to the first direction between a first position, in which the engagement portion is clear of the strike and a second position in which the engagement portion 15 within the strike, the movement of the engagement portion between the first and second portions causing the engagement portion to enter the strike in the second direction and the engagement portion being reversibly configurable when in the second position between a first configuration, in which the pin is movable in the second direction back to the first position, and a second configuration in which the engagement portion engages a part of the strike to hold the pin and strike together such as to resist movement of the pin in the second direction, thereby resisting separation of the leaves in the second direction. Optionally, one of the leaves may have a passage through that leaf, running transverse to the first direction, wherein the pin is slidably constrained within the passage. Preferably, the lock may further include a cylinder, wherein the pin is slidably constrained within the cylinder. The advantage of a passage within the leaf is that the pin is securely mounted within the leaf and no additional components are required to fix the pin to the leaf. If the lock includes a cylinder, the lock may be able to be supplied s separately as a self contained unit within said cylinder, and be retro-fitted to existing sliding doors. To further aid this, the cylinder may further include a radial lip at one of its ends so that it can be located at a predetermined depth within a leaf.

Optionally, the sliding door may further comprise a second lock to assist to secure together the two leaves at a predetermined position, wherein the second lock comprises a second strike on a face of one of the leaves and a second pin mounted on the other leaf, the second pin having an engagement portion and being movable in a second direction generally transverse to the first direction between a first position, in which the engagement portion is clear of the second strike and a second position in which the engagement portion is within the second strike, the movement of the engagement portion between the first and second portions causing the engagement portion to enter the strike in the second direction and the engagement portion being reversibly configurable when in the second position between a first configuration, in which the second pin is movable in the second direction back to the first position, and a second configuration in which the engagement portion engages a part of the second strike to hold the second pin and second strike together such as to resist movement of the second pin in the second direction, thereby resisting separation of the leaves in the second direction. This second lock may be positioned at a different location on the same overlapping section as the first lock, and can thereby offer additional strength to the locking of the sliding door.

Note that the reference to the engagement portion of lock being configurable between two different positions does not refer only to changes of shape, but may also refer to changes in orientation. Therefore, optionally, the first and second configurations may be first and second orientations, and the pin may be configurable between these orientations by rotation.

Note that although the first and second configurations of the pin of the second lock may be aligned with the first and second configurations of the first lock, this is not essential and the respective configurations or orientations of the locks may be different.

Optionally the engagement portion of the pin may be a T-bar and the strike may comprise a slot, adapted to receive the T-bar when the pin is in the first configuration. This allows the lock to be engaged by a simple rotation of the T-bar, i.e. moving to the second configuration, within the strike and offers a simple yet effective locking system.

Preferably the strike is a separate component to the leaf to which it is attached so that it may be retro-fitted to existing doors and preferably it is also formed from a material of a desired suitable strength, for example a metal or metal alloy.

Optionally the passage or cylinder may have a resilient means which urges the engagable portion of the pin towards the first position when not engaged with the strike. Accordingly, when not engaged with the strike, the pin is withdrawn from the strike so that it does not foul the relative movement of the sliding leaves. Preferably the resilient means is a spring.

Optionally, the sliding door may also comprise a third leaf, at least one of the leaves being slidable relative to the others in a first direction to vary the extent of overlapping, and an additional lock to secure the third leaf to an adjacent leaf at a predetermined position, wherein the additional lock also comprises a strike on a face of one of the leaves and a pin mounted on the other leaf, the pin having an engagement portion and being movable in a second direction generally transverse to the first direction io between a first position, in which the engagement portion is clear of the strike and a second position in which the engagement portion is within the strike, the movement of the engagement portion between the first and second portions causing the engagement portion to enter the strike in the second direction and the engagement portion being reversibly configurable when in the second position between a first configuration, in which the pin is movable in the second direction back to the first position, and a second configuration in which the engagement portion engages a part of the strike to hold the pin and strike together such as to resist movement of the pin in the second direction, thereby resisting separation of the leaves in the second direction.

Again, configuration does not simply refer to changes in shape, but also changes in orientation. Therefore, optionally, the first and second configurations may be first and second orientations, and the pin may be configurable between these orientations by rotation.

Note that although the first and second configurations of the pin of the second lock may be aligned with the first and second configurations of the first lock, this is not essential and the respective configurations of the locks may be different.

Optionally, the sliding door may even include a fourth leaf, at least two of the leaves being slidable relative to the others in a first direction to vary the extent of overlapping, and an additional lock to secure the fourth leaf s to an adjacent leaf at a predetermined position, wherein the additional lock also comprises a strike on a face of one of the leaves and a pin mounted on the other leaf, the pin having an engagement portion and being movable in a second direction generally transverse to the first direction io between a first position, in which the engagement portion is clear of the strike and a second position in which the engagement portion is within the strike, the movement of the engagement portion between the first and second portions causing the engagement portion to enter the strike in the second direction and the engagement portion being reversibly configurable when in the second position between a first configuration, in which the pin is movable in the second direction back to the first position, and a second configuration in which the engagement portion engages a part of the strike to hold the pin and strike together such as to resist movement of the pin in the second direction, thereby resisting separation of the leaves in the second direction.

It is preferable that the pin and strike are formed from a metal or metal alloy to offer sufficient strength for the lock.

According to a second aspect, the invention may provide a lock for securing first and second aligned overlapping leaves of a sliding door together, the leaves being slidable relative to the other in a first direction to vary the extent of overlapping, the lock comprising: a cylinder; a strike, separate from the cylinder, alignable with the cylinder; and, a pin, having an engagement portion, slidably constrained within the cylinder and movable in a second direction, transverse to the first direction, between a first position in which the engagement portion is clear of the strike and a second position in which the engagement portion is within the strike, the movement of the engagement portion between the first and second portions causing the engagement portion to enter the strike in the second direction and the engagement portion being reversibly configurable when in the second position between a first configuration, in which the pin is movable in the second direction back to the first position, and a second configuration in which the engagement portion engages a part of the strike to hold the pin and strike together such as to resist movement of the pin in the second direction, thereby resisting separation of the leaves in the second direction.

Although the second aspect refers to sliding doors, it will be apparent to the skilled person that the lock of the second aspect may be used in conjunction with other apertures and coverings, e.g. sash windows, hatches, conventional doors etcetera.

Embodiments of the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 shows a plan view of a conventional patio door with interlocking tabs on corresponding uprights.

Figure 2 shows a perspective view of a lock for sliding doors.

Figure 3 shows a perspective view of a lock for a sliding door in position on adjacent leaves of a sliding door Figure 4 shows an elevation of a two leaf patio door with locations where the lock may be fitted.

Figure 5 shows an elevation of a four leaf sliding patio door with positions where the lock may be fitted.

Figure 6 shows an elevation of a three leaf sliding patio door with positions where the lock may be fitted.

Figure 7 shows a perspective view of another lock for a sliding door.

Figure 8 shows a perspective view of the lock of figure 7 in position on adjacent leaves of a sliding door.

Figure 1 shows a plan view of a conventional prior art sliding patio door 2. The patio door comprises a fixed leaf 4 and a sliding leaf 6. It is shown in its closed position where respective upright members of the fixed 4 and sliding 6 leaves s overlap. At the point of overlap 8, each of the leaves 4,6 are provided with an interlocking tab 10. These interlocking tabs 10 interlock to provide a weather tight seal between the leaves 4,6.

Figure 2 shows a perspective view of a lock for a sliding io door. Figure 2 shows the cylinder 12 of a lock 14. The cylinder 12 is fitted with a flange 16, so that it may be inserted to a pre-determined depth within a portion of a leaf of a sliding door (shown in figure 3). A pin or bolt 18 is slidably constrained within the cylinder 12, such that it may is only slide along the cylinder 12 and rotate about its own axis. The pin further comprises a thumbscrew 20 at its head so that the position of the tip of the pin 22 can be determined by rotation and depression of said thumbscrew 20.

A strike 24 is disposed on a second leaf of a sliding patio door (not shown) and is positioned such that when the leaves are in the closed position the strike 24 directly faces the cylinder 12 and is adapted to receive the tip of the pin 22.

In this embodiment the tip of the pin 22 is formed into a T-bar', which fits into a slot 26 on the strike 24 only when the cross-member of the T-bar 22 is oriented in an upright position. It is of course possible for the tip of the pin to be some other type of engagable portion, for example an overhang, etc. The rotational orientation of the tip of the pin can be determined by rotation of the thumb screw 20. The T-bar 22 may be fitted into the slot 26 on the strike 24 and then rotated by as much as 90 degrees to lock within the strike. When in this locked position, the lock 14, and consequently the leaf of the patio door to which it is fitted, is restrained against translational movement.

To unlock the T-bar 22 from the strike 24, the T-bar 22 is rotated again until its cross-member is again in the upright position and it can be withdrawn from the slot 24 on the strike 26. The T-bar 22 can then be withdrawn towards the cylinder 12 of the lock 14 until it is adjacent said cylinder 12. The lock 14, and consequently the leaf to which it is fitted, is therefore free to slide relative to the fixed leaf to vary their extent of overlapping.

In this way the lock 14 and the strike 26 prevent the patio doors 4,6 from being forced to slide open and from being separated with the application of force in a direction is generally transverse to the direction of sliding, when engaged. Accordingly, the lock and strike provide improved security for sliding patio doors.

The cylinder 12 of the lock 14 may also be fitted with a spring, or other resilient means, which urges the T-bar 22 towards the cylinder 12 when it is not in the locked position.

Accordingly, the t-bar 22 will abut the cylinder 12 when not locked within the strike 24 and thus the bolt 18 cannot foul free movement of the leaves of the patio door sliding relative to one another.

Figure 3 shows a perspective view of the lock of figure 2 in position on a sliding door. Figure 3 shows the overlapping sections 8 of a fixed leaf 4 and a sliding leaf 6 overlapping when the sliding door is in the closed position. The lock 14 is embedded within the overlapping section of the sliding leaf 6 at a pre-determined depth such that the flange 16 of the lock 14 abuts the overlapping section of the sliding leaf 6.

The pin or bolt 18 is slidably constrained within said embedded cylinder. The pin 18 can lock and unlock with the strike 24 on the overlapping section of the fixed leaf 4 as described above with reference to figure 2.

When the lock is in the locked position the overlapping sections 8 of the fixed 4 and sliding 6 leaves are locked together to resist movement in both the direction of sliding and the direction of separation, transverse the direction of sliding. Accordingly, the leaves cannot be forced apart easily to gain unauthorised access through the door.

Figure 4 shows an elevation of a two leaf sliding patio door 28 including a fixed leaf 30 and a sliding leaf 32. The patio door 28 is shown in the closed position where the fixed leaf 30 and the sliding leaf 32 slightly overlap to form an overlapping section 34. A lock corresponding to that shown in figures 2 and 3 is located at positions 36 in this example. As above, this will prevent the leaves of the doors 30,32 being forced apart at the overlapping section 34 in a direction transverse to the direction of sliding 38.

Figures 5 and 6 show elevations of four and three leaf sliding doors respectively, including fixed leaves 30 and sliding leaves 32. The patio doors are shown in the closed position where the fixed leaves 30 and sliding leaves 32 slightly overlap to form overlapping sections 34. A lock corresponding to that shown in figures 2 and 3 is located at positions 36. Again, this will prevent the sliding and fixed leaves 30,32 from being forced apart at the overlapping sections 34 in a direction generally normal to the direction of sliding 38.

Figure 7 shows a perspective view of an alternative lock for a sliding door. Figure 7 shows the cylinder 12 of a lock 14. The cylinder 12 has a flange 16 at one end, so that it may be inserted to a pre-determined depth within a portion of a leaf 6 of a sliding door (as shown in Figure 8). A pin or bolt 48 is constrained within the cylinder 12 such that it can slide in a longitudinal direction (shown by arrow 50) along the cylinder 12, and in a transverse direction (shown by arrow 46) across the cylinder 12. The pin 48 includes a handle 40, so that the translational position of the pin 48 can be determined. The cylinder 12 of the lock 14 also has a flange 16, so that the cylinder 12 can be embedded into a sliding patio door as a predetermined depth by inserting the cylinder io 12 into a tight fitting passage in the door until the flange 16 abuts the door.

There is then a strike 24 on a second leaf 4 of a sliding door (shown in Figure 8) which is positioned such that is when the leaves are in the closed position the strike 24 directly faces the cylinder 12. The strike 24 has a slot 44 adapted to receive the tip of the pin 48. In this embodiment the tip of the pin 48 is formed into a hook 42, which is reversibly movable into the slot 44 in the strike 24 only when the pin 48 is at one extend of its travel in the direction 46 across the cylinder. As before, it is of course possible for the tip to be some other type of engagable portion.

When the lock 14 and the strike 24 are facing each other, the lock may be engaged with the strike by depression of the handle 40 in the direction 50 along the cylinder, such that the hook 42 of the pin 48 enters the slot 44 on the strike 24, and then sliding of the handle 40 of the pin 48 in the direction 46 across the cylinder to engage the hook 42 of the pin 48 within the slot 44 of the strike 42.

When in this locked position, the pin 48 resists sliding of the leaves of sliding doors (shown in Figure 8) in direction 46, and the hook 42 prevents separation of the corresponding uprights of sliding leaves in the direction 50.

Consequently, the lock is restrained against translational movement.

To unlock the lock 14 from the strike 24, the handle 40 s of the pin 48 is depressed in the longitudinal direction of arrow 50 along the cylinder, such that the hook disengages the strike. The handle 40 of the pin 48 is then slid in the transverse direction of arrow 46 across the cylinder, such that the hook 42 clears the strike 24 and the hook can be withdrawn from the strike in the direction 50 along the cylinder. The lock 14, and consequently the leaf to which it is fitted, is therefore free to slide relative to the fixed leaf to vary their extent of overlapping.

The lock 14 may be fitted with a spring such that the pin 48 returns to the withdrawn position in the direction 50 along the cylinder 12 when not engaged. Consequent1y the pin 48 cannot foul the relative movement of the sliding doors when it is not engaged.

Optionally the lock may be also be fitted with a slidable pivot, about which the pin can rotate in the direction 48 across the cylinder, and the pivot may be slidable in the direction 50 along the cylinder. Accordingly, the engagement of the hook 42 with the slot in the strike 44 can be initiated by rotation of the pin about the pivot when the pin in the depressed position, improving ease of engagement of the hook 42 with the slot 44 in the strike 24.

Figure 8 shows a perspective view of a lock for a sliding door in position on a sliding door. Figure 8 shows the lock 14 and the strike 24 in position on a sliding leaf 6 and a fixed leaf 4 respectively. The cylinder 12 (shown in Figure 7) has been inserted into the frame of the sliding leaf 6 at a pre-determined depth, such that the flange 16 abuts the frame of the sliding leaf 16. By engagement of the lock as described with reference to figure 7, the sliding leaf 6 and the fixed leaf can be restrained against relative translational movement.

Claims

CLAIMS1. A sliding door comprising two aligned overlapping leaves, one of the leaves being slidable relative to the other in a first direction to vary the extent of overlapping, and a lock to secure together the two leaves at a predetermined position, wherein the lock comprises a strike on a face of one of the leaves and a pin mounted on the other leaf, the pin having an engagement portion and being movable in a second direction generally transverse to the first direction between a first position, in which the engagement portion is clear of the strike and a second position in which the engagement portion is within the strike, the movement of the engagement portion between the first and second portions causing the engagement portion to enter the strike in the second direction and the engagement portion being reversibly configurable when in the second position between a first confiquration, in which the pin is movable in the second direction back to the first position, and a second configuration in which the engagement portion engages a part of the strike to hold the pin and strike together such as to resist movement of the pin in the second direction, thereby resisting separation of the leaves in the second direction.
2. A sliding door according to claim 1, wherein the first and second configurations are first and second orientations.
3. A sliding door according to claim 1, wherein one of the leaves further comprises, a passage through said leaf, running transverse to the first direction, wherein the pin is slidably constrained within the passage.
4. A sliding door according to claim 1, wherein the lock further comprises a cylinder and the pin is slidably constrained within the cylinder.
5. A sliding door according to claim 4, wherein the cylinder comprises a radial lip at one of its ends.
6. A sliding door according to any one of the preceding claims, further comprising a second lock to assist to secure together the two leaves at a predetermined position, wherein the second lock comprises a second strike on a face of one of the leaves and a second pin mounted on the other leaf, the second pin having an engagement portion and being movable in a second direction generally transverse to the first direction between a first position, in which the engagement portion is clear of the second strike and a second position in which the engagement portion is within the second strike, the movement of the engagement portion between the first and second portions causing the engagement portion to enter the strike in the second direction and the engagement portion being reversibly configurable when in the second position between a first configuration, in which the second pin is movable in the second direction back to the first position, and a second configuration in which the engagement portion engages a part of the second strike to hold the second pin and second strike together such as to resist movement of the second pin in the second direction, thereby resisting separation of the leaves in the second direction.
7. A sliding door according to claim 6 wherein the first and second configurations are first and second orientations.
8. A sliding door according to either one of claim 7 or claim 2, wherein the engagable portion of the pin or pins is a T-bar.
9. A sliding door according to claim 8, wherein the or each strike comprises a slot, adapted to receive the or each T-bar when the or each pin is in the first configuration.
10. A sliding door according to any one of the preceding claims, wherein the or each strike is a separate component to the leaf to which it is attached.
11. A sliding door according to claim 3 or claim 4 wherein the passage or cylinder further comprises, a resilient means which urges the engagable portion of the pin towards the first position when not engaged with the strike.
12. A sliding door according to claim 11, wherein the resilient means is a spring.
13. A sliding door according to claim 1, further comprising, a third leaf, at least one of the leaves being slidable relative to the others in a first direction to vary the extent of overlapping, and an additional lock to secure the third leaf to an adjacent leaf at a predetermined position, wherein the additional lock also comprises a strike on a face of one of the leaves and a pin mounted on the other leaf, the pin having an engagement portion and being movable in a second direction generally transverse to the first direction between a first position, in which the engagement portion is clear of the strike and a second position in which the engagement portion is within the strike, the movement of the engagement portion between the first and second portions causing the engagement portion to enter the strike in the second direction and the engagement portion being reversibly configurable when in the second position between a first configuration, in which the pin is movable in the second direction back to the first position, and a second configuration in which the engagement portion engages a part of the strike to hold the pin and strike together such as to resist movement of the pin in the second direction, thereby resisting separation of the leaves in the second direction.
14. A sliding door according to claim 13, wherein the first and second configurations are first and second orientations.
15. A sliding door according to claim 13, further comprising, a fourth leaf, at least two of the leaves being slidable relative to the others in a first direction to vary the extent of overlapping, and an additional lock to secure the fourth leaf to an adjacent leaf at a predetermined position, wherein the additional lock also comprises a strike on a face of one of the leaves and a pin mounted on the other leaf, the pin having an engagement portion and being movable in a second direction generally transverse to the first direction between a first position, in which the engagement portion is clear of the strike and a second position in which the engagement portion is within the strike, the movement of the engagement portion between the first and second portions causing the engagement portion to enter the strike in the second direction and the engagement portion being reversibly configurable when in the second position between a first configuration, in which the pin is movable in the second direction back to the first position, and a second configuration in which the engagement portion engages a part of the strike to hold the pin and strike together such as to resist movement of the pin in the second direction, thereby resisting separation of the leaves in the second direction.
16. a sliding door according to claim 15, wherein the first and second configurations are first and second orientations.
17. A sliding door according to any one of the preceding claims, wherein the pin and strike are formed from a metal or metal alloy.
18. A lock for securing first and second aligned overlapping leaves of a sliding door together, the leaves being slidable relative to the other in a first direction to vary the extent of overlapping, the lock comprising: a cylinder; a strike, separate from the cylinder, alignable with the cylinder; and, a pin, having an engagement portion, slidably constrained within the cylinder and movable in a second direction, transverse to the first direction, between a first position in which the engagement portion is clear of the strike and a second position in which the engagement portion is within the strike, the movement of the engagement portion between the first and second portions causing the engagement portion to enter the strike in the second direction and the engagement portion being reversibly configurable when in the second position between a first configuration, in which the pin is movable in the second direction back to the first position, and a second configuration in which the engagement portion engages a part of the strike to hold the pin and strike together such as to resist movement of the pin in the second direction, thereby resisting separation of the leaves in the second direction.
19. A lock according to claim 15, wherein the first and second configurations are first and second orientations.
20. A lock or sliding door according to any one of the preceding claims wherein the engagement portion of the pin is configurable between the first and second configurations by rotation.
21. A sliding door substantially as herein described with reference to and as illustrated in figures 2-5 of the accompanying drawings.