Door latch

Abstract

A sliding door handle and strike assembly includes a locking member for engaging the strike to prevent the door from opening. The locking member is biased to an unlocked position, until it is moved into a locking position, in which magnetic co-operation acts to hold the locking member in the locking position.

Claims

1. A sliding door and latch assembly for latching onto a strike comprising: a front face plate substantially parallel with a closing edge of a sliding door to which said assembly is mounted, said front face including an aperture therein receiving said strike when said sliding door is closed, a locking member moveable between an unlocked position wherein said locking member is located completely out of a pathway along which said strike enters said aperture during closing of said door, and a locked position wherein said locking member engages with said strike to prevent said door from opening, and wherein said locking member is biased into said unlocked position, and wherein said strike and said locking member are configured to co-operate magnetically such that said magnetic co-operation moves and holds said locking member into said locked position against said bias, when said sliding door is closed and a user manipulable locking actuator is in a locked position.

2. A sliding door and latch assembly as claimed in claim 1, wherein said front face plate of said latch assembly is substantially aligned with said closing edge of said sliding door.

3. A sliding door and latch assembly as claimed in claim 1, wherein said aperture is sufficiently large to allow a user's finger to enter it such that it can operate as a finger pull, to move said door in a closing direction.

4. A sliding door and latch assembly as claimed in claim 1, wherein said biasing member is a spring.

5. A sliding door and latch assembly as claimed in claim 1, wherein said user manipulable locking actuator is a snib member, adapted to move said locking member sufficiently close to said strike, when said door is closed, such that said magnetic cooperation moves and holds said locking member in said locked position.

6. A sliding door and latch assembly as claimed in claim 5, wherein said handle assembly further includes a side member substantially aligned and parallel to a side face of said door, and said side member of said handle assembly includes an aperture recess adapted for a user to engage, and said snib is located in said aperture recess.

7. A sliding door and latch assembly as claimed in claim 6, wherein said assembly includes two said side members, each substantially aligned and parallel to a respective side face of said door, and said side members of said handle assembly include an aperture recess adapted for a user to engage, and at least one aperture recess includes said snib.

8. A sliding door and latch assembly as claimed in claim 7, wherein said side members are mounted to said door via a plurality of fasteners, and wherein said side members include flange portions depending therefrom, and fasteners are fixed into a front edge surface of said door via said flanges, to mount said side members rigidly to said door.

9. A sliding door and latch assembly as claimed in claim 8, wherein said front face is separate from said side members, such that said side members are moveable to accommodate different width doors.

10. A sliding door and latch assembly as claimed in claim 9, wherein said front face plate is part of a locking sub-assembly, further including said locking member and a member biasing said locking member into said unlocked position, and wherein said locking sub-assembly is fixed independently of said fasteners associated with said side members.

11. A sliding door and latch assembly as claimed in claim 6, wherein at least outside faces of said side members are symmetrical such that each can be used on an alternative side of said door.

12. A sliding door and latch assembly as claimed in claim 1, wherein said movement of said locking member between said unlocked position and said locked position, is linear.

13. A sliding door and latch assembly as claimed in claim 1, wherein said strike includes a base adapted to mount to a door jamb or an adjacent door, and a protruding portion extending from said base toward said door, and said protruding portion includes a barb portion defining an engagement surface adapted to interact with said locking member to prevent said door from separating from said strike when said locking member is in said locking position.

14. A sliding door and latch assembly as claimed in claim 1, wherein said locking actuator is a magnet.

15. A sliding door and latch assembly as claimed in claim 1, wherein said locking member is of a non-magnetic material.

16. A sliding door and latch assembly as claimed in claim 1, wherein said locking member and said locking actuator are integral with each other.

17. A sliding door and latch assembly as claimed in claim 1, wherein said locking actuator is of a ferro-magnetic material, and said strike includes at least a magnetic component associated with it.

18. A sliding door and latch assembly as claimed in claim 1, wherein said magnetic co-operation between said strike and said locking actuator member is insufficiently strong to move said locking member from an unlocked position into a locked position, when said strike enters said aperture when said door is closed.

19. A sliding door and latch assembly as claimed in claim 1, wherein said magnetic co-operation between said strike and said locking member is insufficiently strong to move said locking member into a locked position, when said strike enters said aperture when said door is closed, when said user manipulable locking actuator is in an unlocked position.

20. A sliding door and latch assembly as claimed in claim 1, wherein said strike is mounted directly or indirectly to an adjacent door in a bi-parting configuration.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present invention will now be described by way of example only and with reference to the accompanying drawings in which:

(2) FIG. 1 shows a perspective view of a door into which a handle assembly according to one preferred configuration is installed.

(3) FIG. 2 shows a partial cut-away perspective view of the handle assembly of FIG. 1, having the near side plate and front plate locking sub-assembly removed.

(4) FIG. 3 shows a rear view of a preferred locking sub-assembly.

(5) FIG. 4 shows a partial cut-away perspective view of the handle assembly of FIG. 1, having the front plate removed to reveal parts of the locking sub-assembly.

(6) FIG. 5 shows a partial cut-away perspective view of the handle assembly of FIG. 4, including a strike and with the locking member in a locked position engaged with the strike.

(7) FIG. 6 shows the handle assembly of FIG. 2, having the near side plate and front plate in place.

(8) FIG. 7 shows a perspective view of an alternative handle assembly including an emergency snib configuration.

(9) FIG. 8 shows a perspective view of an alternative handle assembly including a blanking snib configuration.

(10) FIG. 9 shows a perspective view of an alternative handle assembly including a hidden snib configuration.

(11) FIG. 10 shows a perspective view of an alternative handle assembly including an alternative small snib configuration.

(12) FIG. 11 shows a perspective view of an alternative handle assembly including an alternative large snib configuration.

(13) FIG. 12 shows a perspective view of an alternative handle assembly mounted in a wider door and including a strike for engaging with a handle in an adjacent door in a bi-parting configuration.

DETAILED DESCRIPTION

(14) As will be described in detail in the following description, the present door handle assembly preferably provides a handle assembly comprising components that are easy to manufacture, as this can be a significant factor in the cost to the consumer. Similarly, the components and/or handle assembly are preferably easy to assemble, and also preferably easy to install on site. Other advantages of the preferred configurations will also make themselves apparent.

(15) With reference to FIG. 1, there is shown a door 1 having a handle assembly 2 mounted thereon. Door 1 is a sliding door and as such only moves substantially in the plane of the door 1, on a track (not shown for simplicity). Such sliding door track systems are well known in the art, and for the avoidance of doubt may also include side-by-side sliding doors in an ‘overtaking door’ configuration.

(16) The door 1, includes a door edge 4 which when closed preferably abuts flush with a closing door jamb (not shown). Alternatively, as will be described in more detail later, some configurations may abut another adjacent door sliding in the same plane (rather than a door jamb), if used in a bi-parting door configuration.

(17) Front plate 5 of the handle assembly 1 includes an aperture 6. In the most preferred configurations the aperture 6, performs two functions being firstly to receive a strike 3, and secondly to act as a finger pull to allow a user to pull the door in a closing direction.

(18) The function of a finger pull, is particularly useful where the door 1 is installed in a pocket door system, because when fully open, only the front edge 4 of the door 1 is typically user accessible. Accordingly, it is preferred that the size of the aperture 6 is sufficient for a user to put a finger tip through to engage the front plate 5, and thereby grip the door 1 to assist in pulling from the pocket. The dual use of aperture 6, helps contribute to the desirable aesthetic of the handle assembly 2.

(19) Alternatively, the front face plate 5 may include separate apertures to perform each of the functions of receiving a strike and acting as a finger pull. Alternatively still, there are known pull latches that can be extended to retrieve the door 1 when desired, or other method.

(20) With further reference to FIG. 1, the strike 3 is shown in alignment with aperture 6 such that when door 1 is fully closed, the strike 3 enters the aperture 6. Preferably, the aperture 6 is sufficiently deep to receive the entire strike 3. It may also be preferred that the strike 3 does not touch the front plate 5, as this can leave marks over time.

(21) With reference to FIG. 2, the handle assembly 2 is shown with the near side handle plate 7, and front face plate 5 removed, to show aspects of the inner workings of the preferred assembly. In this view it can be seen that the side plates 7 are mounted into a cut-out 10, in door 1. In particular, the cut-outs 10 also preferably include rebate portions 11 (at top and bottom) to receive the side plates 7. The side plates 7 include flange portions 8 extending across a portion of the front edge of the door width, and include apertures and/or slots 12 through which fasteners 9, fix the side plates 7, to the door 1.

(22) It is preferred that mounting wedges 13, are provided between rebate portions 11 and the mounting flanges 8. In particular, mounting wedges 13 include angled front facing surfaces that mate with the rear surface of the mounting flanges 8. This angled surface is configured to pull the distal edges of the handle side plates 7 towards the door surface as the fasteners 9 are tightened. It has been found that an angle of a few degrees (away from the front face normal) is preferred. The wedges preferably have mirrored angled surfaces to mate with respective side handle plates on each side of the door 1. The wedges may be made from a polymer material, or alternatively a metallic material.

(23) In most applications the face plate 5, and side plate 7 are preferably metal components such as stainless steel, brass, copper, painted or powder coated metal, or other suitable material.

(24) In order to ensure alignment between respective halves of the handle plates 7, alignment features are preferably provided. It is preferred that any alignment features are not ‘handed’ (i.e. not requiring a left hand version and a right hand version). That is, it is preferred that the side plates are identical so that the same tool can be used to produce the parts for each side and/or the same part can be used on each side (by simply turning the part over). This feature (if present), also means that ordering mistakes are eliminated where a customer may order a left hand closing product, when they actually need a right hand closing product. It will be appreciated by those skilled in the art that other ‘non-handed’ patterns of alignment features may be adopted, for example patterns of male and female features.

(25) For example, as shown in FIG. 2, alignment pins 14 are placed in respective apertures provided on side plates 7. It will be appreciated that pins 14 when engaged with apertures in the opposite side plate 7 (not shown) will complete alignment.

(26) With further reference to FIG. 2, a snib 15 is shown moveably mounted on rails 16 so slots 17 engage with rails 16 to allow the snib 15 to be moved up and down (shown in its uppermost position) in a substantially vertical direction. As shown in FIG. 2, it is preferred that each handle plate flange includes a moveable snib member 15. However, as will be described in more detail later, the moveable snib members 15 may take any of a number of forms (and may or may not function as a snib).

(27) Where a snib 15 is provided on both sides of the handle assembly 2, a snib pin 18 may be provided in order to couple the respective snibs together.

(28) The width of the handle plate flanges 8 may preferably extend less than (or equal to) half the width of the door 1. It will be appreciated that in this configuration, the handle plates 7 may accommodate fixing to variable widths of door 1 (without modification). This feature allows the same parts to be adapted for different door widths without needing different sized components. To this effect it is preferred that the alignment features allow for movement of the handle plate components 7 in a direction out of plane with door 1 in order to accommodate different door widths.

(29) With reference to FIG. 3, a locking sub-assembly 19 is shown mounted on the rear of front face plate 5. It is preferred that this sub-assembly 19 is separable and engagable with the mounted handle plates 7, and snib assembly as shown in FIG. 2. In order to mount the locking sub-assembly 19, a plurality of fastener apertures 29 are provided as shown in FIG. 6 assembled.

(30) It is preferred that all fasteners are fitted into the edge of the door 1, so that there are no fasteners visible from the sides of the handle assembly. As a result no fasteners are visible when the door 1 is closed.

(31) Finger shroud 20 is preferably part of the locking sub-assembly 19 and moveably mounted with respect to front face plate 5, by sliding vertically on guide rods 21. Guide rods 21 are fixed to the front face plate 5 via guide rail blocks 22. A spring 23 biases finger shroud 20 upwards (into an unlocked position). The rear surface of finger shroud 20 is provided with engaging features 24 which (when assembled) engaged with snib pin 18 such that movement of the snib 15 is coupled to movement of the finger shroud 20.

(32) With particular reference to FIG. 4, the handle assembly is shown with a locking sub-assembly 19 in situ, but with the front face plate 5 removed. In this view, the finger shroud 20 is shown coupled to snibs 15 which are moveable along guide rods 21, and are shown biased into an unlocked position by spring 23. The finger shroud 20 in this configuration is part of a locking sub-assembly 19. However, it is to be appreciated that the locking sub-assembly 19 may not necessarily include a finger shroud 20 that is moveable with the locking sub-assembly 19.

(33) With reference to FIG. 5 the handle assembly 2 is shown engaged with a strike 3. In order to reach this position in use, the door 1 has been closed until the strike 3 has been received within front plate aperture 6. Subsequently, a user can manipulate the snib 15 (located in a recess 26 of side plate 7), in order to translate the locking assembly downwards, against the bias of spring 23. In this position locking member 25 is positioned in the pathway of the strike 3, such that locking member 25 engages with barb portion 27 of strike 3, preventing the door 1 from being opened.

(34) In order to retain the locking sub-assembly 19 in the locking position (as shown in FIG. 5), a magnet locking actuator 28 is provided. Magnet 28 co-operates with strike 3 such that attraction between the two, holds the locking sub-assembly 19 in a locked position against the bias of spring 23 which would otherwise unlock the assembly (when the snib was released).

(35) In this configuration, it is preferred that locking member 25 is of a non-magnetic (or non-ferro-magnetic) material. Preferably in this configuration the lock is configured such that the magnetic attraction between the locking assembly 19 and strike 3, is insufficient to move the locking assembly from an unlocked position to, a locked position. That is, in this configuration, the assembly cannot be locked without a user manipulating the snib, which when moved to the locking position, the magnetic attraction keeps the door locked.

(36) Accordingly, without manipulation of the snib 15, the door 1 can be closed (or slammed) onto the strike without causing any damage due to the spring 23 biasing the locking mechanism into an unlocked position and out of a contact pathway with the snib 15. However, the locking sub-assembly 19 is only held in a locking position when the door is closed on the strike 3, and a user manipulates the snib 15, bringing the magnet actuator close enough to the strike in order to hold the locking member against the bias of spring 23.

(37) Although in the above configuration the locking assembly includes magnet 28, and snib 15 made of a ferro-magnetic material, in order that they co-operate to be attracted to each other, it will be appreciated that the arrangement may be reversed, or alternatively still, both may include magnetic elements in order to provide the required attraction.

(38) In another configuration, it may be desirable that the handle assembly 2 is configured to automatically lock on closing. This alternative configuration can be achieved by changing the relative strength between spring 23 and the attraction between the locking sub-assembly 19 and strike 3. For example, the attraction may be sufficiently strong such that when the door is closed on a strike 3, the spring 23 is overpowered and the locking member 25 is pulled downwards to engage with the strike. In this configuration a user must manipulate the snib 15 in order to unlock the locking member 25 from the snib 15 in order to open the door.

(39) As the door is opened, the distance between the locking sub-assembly 19 and snib 15, becomes sufficient to reduce the attraction and allow the spring 23 to bias the locking assembly 19 into an unlocked position. This prevents damage to the locking member as the door is closed onto the snib, by maintaining the locking member in an unlocked position until the door is fully closed.

(40) With reference to FIG. 6, the snib 15 is shown accessible in a recess 26 of handle plate 7. It will be appreciated that different configurations may be desirable, where each side of the handle may require a different snib configuration. The present handle 2, provides a very easy way to simply change the snib member 15, to alter the utility of the handle.

(41) Some example configurations will now be summarised with reference to FIG. 7 to FIG. 11. It will be understood that each, may be used on one or both sides of the handle according to user requirements. The following are simply examples.

(42) FIG. 7 shows an emergency type snib 15, that may be used on at least one side of the handle (likely in combination with any other snib style). The emergency snib 15 would be common for a privacy configuration where a normal snib is used on the inside, and an emergency snib on the outside that can be used with a tool to engage the emergency snib, but is not easy to override with fingers alone.

(43) FIG. 8 shows a blanking snib 15, which may be used where no locking/unlocking action is required. This may be on one side of the door or alternatively both.

(44) FIG. 9 shows a hidden snib 15, that can be manipulated by a user relatively easily, but provides a very unobtrusive aesthetic.

(45) FIG. 10 shows an alternative snib 15.

(46) FIG. 11 shows another alternative snib 15, that is larger and may be easier to manipulate. This may be more appropriate for younger children, elderly adults, or people with disabilities that affect fine motor control.

(47) With reference to FIG. 12, a handle 2 is shown mounted to a wider door 1. In this configuration it can be seen that small gaps 30 open up between the front plates 5, and side plates 7. The flange portions 8 of side plates 7 (not visible), cover the door beneath the gaps 30, to present a solid looking handle. It has been found that door widths up to around 6 mm wider (presenting a 3 mm gap on each side), are more than acceptable and it is difficult to detect the variation.

(48) Accommodation of larger gaps are possible, but it is preferred that wider front plates 5 are used to optimise the aesthetic look of the handle.

(49) With further reference to FIG. 12, the handle 2 includes a strike 3. This handle is intended as a matching pair for a bi-parting door configuration, in which the handle shown in FIG. 12, interacts with a handle as described earlier.