A latch assembly

Abstract

A latch assembly (1) for latching to a keeper (200), the latch assembly adapted for use on a member arranged for linear movement in a first direction with respect to the keeper, the latch assembly comprising: a body (190); and a hook bolt (100) pivotally coupled to the body at a pivot point (140), the hook bolt comprising a latching surface (111) adapted to engage with the keeper (200) in a latched position; wherein the hook bolt (100) is adapted to pivot from the latched position towards an unlatched position such that the latching surface (111) moves in an arcuate path (220) having a positive linear component in a second direction perpendicular to the first direction; wherein the latching surface (111) has a curvature in a plane in which the hook bolt (100) moves less than the curvature of the arcuate path; and wherein at least part of the latching surface (111) is adapted to engage with the keeper (220) at a point separated in the second direction from a line (223) that passes through the pivot point (140) and that is parallel to the first direction. Intruders may try to unlatch a latched member by forcing a latch hook from a keeper directly, thus bypassing any security measures (such as locks) that would otherwise prevent unauthorised release of the latch. The invention provides a latch assembly with a hook bolt for a sliding door with a latching surface that engages a keeper above a line that passes through a pivot point, preventing the hook bolt from being unlatched by pulling of the door along the line of movement.

Description

A LATCH ASSEMBLYFIELDThis invention relates to a latch assembly. This invention also relates to a keeper for a latch assembly. This invention also relates to a kit including a latch assembly and a keeper.BACKGROUNDLatches are commonly used to retain a moving member with respect to another member. Some latches include a hook bolt that hooks over a keeper. Some latches are used to retain a member arranged for linear movement adjacent another member.Intruders may try to unlatch a latched member by forcing a latch hook from a keeper directly, thus bypassing any security measures (such as locks) that would otherwise prevent unauthorised release of the latch.Users may attempt to unlatch a latched member when it is not fully closed - i.e. when the latched member is somewhat pulled away from another member to which it is latched.SUMMARYAccording to one exemplary embodiment there is provided a latch assembly for latching to a keeper, the latch assembly adapted for use on a member arranged for linear movement in a first direction with respect to the keeper, the latch assembly comprising:a body; anda hook bolt pivotally coupled to the body at a pivot point, the hook bolt comprising a latching surface adapted to engage with the keeper in a latched position;wherein the hook bolt is adapted to pivot from the latched position towards an unlatched position such that the latching surface moves in an arcuate path having apositive linear component in a second direction perpendicular to the first direction; andwherein the latching surface has a curvature in a plane in which the hook bolt moves less than the curvature of the arcuate path; andwherein at least part of the latching surface is adapted to engage with the keeper at a point separated in the second direction from a line that passes through the pivot point and that is parallel to the first direction.According to another exemplary embodiment there is provided a keeper for a latch assembly of a member arranged for linear movement in a first direction with respect to the keeper, the keeper comprising:a body; anda keeper plate;wherein the body and the keeper plate define a cavity for receiving a hook bolt of the latch assembly and allowing movement of a latching face of the hook bolt in an arcuate path;wherein the keeper plate comprises a keeper surface for engaging with a latching surface of the hook bolt; andwherein the latching surface has a curvature in a plane in which the latching face of the hook bolt moves that is less than the curvature of the arcuate path.According to another exemplary embodiment there is provided a kit comprising the latching assembly recited above and the keeper recited above.BRIEF DESCRIPTION OF THE DRAWINGSThe accompanying drawings which are incorporated in and constitute part of the specification, illustrate embodiments and, together with the general description of the invention given above, and the detailed description of embodiments given below, serve to explain the principles of the invention.Figure 1 shows a latching assembly according to an embodiment;Figure 2 shows a latching assembly and a keeper according to an embodiment;Figure 3    shows the latching assembly of Figure 1 in a partly retracted configuration;Figure 4   shows the latching assembly of Figure 1 in a retracted configuration;Figure 5    shows a part of the latching assembly of Figure 1 in detail.DETAILED DESCRIPTION OF EMBODIMENTSLatches may be used to retain various movable members with respect to other members. For example, latches may be used on doors or windows arranged to slide or roll within a frame. Some members may be arranged to move with respect to other movable members, to which they may be latched. A latch may be attached to the moving member and a keeper may be attached to a fixed member. Alternatively, a latch may be attached to a fixed member and a keeper may be attached to a moving member. In the case of two movable members (such as sliding windows), one may have a latch and the other a keeper. In the following description, the embodiments will be described in the context of a latching assembly attached to a sliding door and a keeper attached to a door frame, but it will be understood that this is not essential, and that the latching assembly and keeper may be used in other arrangements as noted above.Figure 1 depicts a latch assembly 1 according to one embodiment. The latching assembly is shown in an extended configuration. The latch assembly 1 includes a body 190 and a hook bolt 100 pivotally coupled to the body 190 at pivot point 140. The hook bolt 100 may be pivotally coupled to the body 190 using a ball bearing or other roller bearing, a plain bearing, a hinged coupling or other suitable coupling allowing pivoting of the hook bolt 100. In the example of Figure 1, the hook bolt 100 is coupled to the body with a plain bearing formed from bearing surface 136 and pin 141. The latch assembly 1 may also be provided with features for attaching it to the member to be latched, for example a door. In the example of Figure 1, the body 190 includes a fastening plate 191 for allowing attachment to members such as doors. The plate 191 may be provided with holes for screws, rivets, or similar fasteners. It will be understood that the body 190 of the latch assembly 1 could be formed of one element or two or more elements joined together. In one example, the body 190 includes abase part and a cover part which are fastened together to form the body 190. In such an example, the part of the body 190 depicted in the figures could be considered be the base part, the cover part not being shown in the figures.The hook bolt 100 has a latching surface 111 which engages with a keeper (not shown in Figure 1) in use. Various shapes of latching surface 111 may be suitable, depending on the details of the keeper. For example, the latching surface 111 may be concave, convex, linear, or some combination of these in profile. It may be advantageous in some uses for the latching surface 111 to be substantially convex, linear, or concave with a curvature no greater than that of an arcuate path taken by the latching surface 111 as it moves from a latched position to an unlatched position. In particular, a latching surface 111 with such a profile may move freely from the latched position to the unlatched position when unlatched, even if the latching surface 111 is pulled against a keeper surface of the keeper, for example by a user pulling on a door while trying to unlatch it. In the example of Figure 1, the latching surface 111 is substantially linear in profile. This profile is in the plane in which the latching surface 111 moves between the latched and unlatched positions.The hook bolt 100 may be formed from various connecting parts or portions that define the latching surface 111. These couple to the body 190 at the pivot point 140 such that the latching surface 111 can move to engage with the keeper in the latched position and be disengaged from the keeper in the unlatched position. For example, the hook bolt 100 could be a single integrally formed piece or a composite of plural pieces. In the example of Figure 1, the hook bolt 100 is a formed from a single piece of material. In this example, the hook bolt 100 has a body 130, a hook portion 110 that includes the latching surface 111, and an arm 120 between the body 130 and the hook portion 110. As shown in Figure 1, the latching surface 111 includes a proximal end 112 proximate to the arm 120 and a distal end 113 distal to the arm 120. The latching surface 111 is arranged at an angle with respect to the arm 120 of the hook bolt 100. In the example of Figure 1, the latching surface 111 forms an acute angle with the arm 120 and angles back in towards the pivot point 140. In this arrangement, the distal end 113 of the latching surface 111 is nearer to the pivot point 140 than the proximal end 112 is.The hook bolt 100 can be biased to one or both of the latched and unlatched positions. This bias could be provided by magnetic materials, weights, elastic elements or other suitable biasing elements. In the example of Figure 1, the hook bolt 100 is bi-stably biased to either the latched or unlatched positions with an over-centre mechanism. The over-centre mechanism is formed by pivoting arm 170 that engages, via compression spring 171, with boss 135 of the hook bolt 100.Movement of the hook bolt 100 is controlled by a bolt-control member 150. The boltcontrol member 150 drives movement of the hook bolt 100 between the latched and unlatched positions as the bolt-control member 150 moves between first and second positions, respectively. The bolt-control member 150 could be arranged to translate, rotate, or some combination thereof, between the first and second positions. In the example of Figure 1, the bolt-control member 150 is arranged to translate between the two positions - “vertically” in the orientation depicted in Figure 1.The bolt-control member 150 may engage with the hook bolt 100 via a movement driver in the form of a boss or other projection riding within a hole of groove of the hook bolt 100, one or more abutting surfaces, one or more lever arms or other mechanical connections in order to drive movement of the hook bolt 100 between the latched and unlatched positions. The movement driver may be in the form of a protrusion having a surface for abutting a complementary surface of the hook bolt 100. In the example of Figure 1, the bolt-control member 150 includes a protrusion in the form of lug 151 that bears on drive surfaces of the hook bolt 100 to drive it between the latched and unlatched positions. The lug 151 of Figure 1 protrudes out from the plane of the main body of the bolt-control member 150 towards the body of the latch assembly 1 (i.e. “into the page” in the view of Figure 1) and outwardly from the edge of the bolt-control member 150 (laterally to the right in the view of Figure 1). In the arrangement shown in Figure 1, the main body of the bolt-control member 150 and the hook bolt 100 overlap in the region of the movement driver and drive surfaces, and the protrusion of the movement driver out of the plane of the main body of the boltcontrol member 150 brings the driver into the plane of the drive surfaces, allowing contact therebetween. It will be appreciated that the protrusion may protrude in various directions and combinations of directions depending on the shape andconfiguration of the hook bolt 100 and drive surfaces thereof and of the bolt-control member 150.The bolt-control member 150 may also prevent the hook bolt 100 from being directly lifted from the latched position. For this, a detent may be provided on the bolt-control member 150 to engage with the hook bolt 100 and restrain the hook bolt 100 from moving from the latched position towards the unlatched position without the boltcontrol member 150 being driven to move from the first position towards the second position. In the example of Figure 1, the detent is formed from the lug 151, which is arranged to engage with a detent surface of the hook bolt 100. In the example of Figure 1, the detent surface is part of a protrusion 131 from the hook bolt 100, in particular from the body 130 of the hook bolt 100. In the arrangement of Figure 1, the main body of the bolt-control member 150 is laterally offset from the detent surface of the hook bolt 100 in the latched position. The protrusion of the detent from the edge of the main body of the bolt-control member 150 brings the detent into position adjacent the detent surface of the hook bolt 100 in the latched configuration. In this configuration, if the hook bolt 100 is directly forced towards the unlatched position, for example by a tool prising the hook bolt upwards, the torque on the hook bolt 100 will force the detent surface against the detent of the bolt-control member 150. As can be seen from the arrangement of Figure 1, this force will have a substantial component perpendicular to the direction in which the bolt-control member 150 must move from its latched position to its unlatched position as the movement of the detent surface under rotation of the hook bolt 100 from the latched position towards the unlatched position has a substantial component perpendicular to the direction of movement of the bolt-control member 150 between its latched and unlatched positions. The direction of movement of the detent surface under rotation of the hook bolt 100 from the latched position towards the unlatched position may be at an angle to the direction of movement of the bolt control member 150 from its latched to its unlatched position greater than 15°, greater than 30°, greater than 45° greater than 60°, greater than 75°, or approximately 90°. Because the movement of the bolt-control member 150 is constrained to be substantially in this line, it will not move a substantial distance in the direction, perpendicular to this line, in which the detent surface applies the force to the detent. The detent therefore blocks pivoting of the hook bolt 100 from the latchedposition to the unlatched position, when the bolt-control member 150 is in its latching (first) position, by engaging with the detent surface.The bolt-control member 150 may be freely movable or may be able to be locked in the first and / or second position. The bolt-control member 150 could include a movable member that translates or rotates to engage with and disengage from a feature fixed with respect to the body. Alternatively, a member movable with respect to the body could translate or rotate to engage with and disengage from a feature fixed with respect to the bolt-control member 150. When engaged, such features can prevent movement of the bolt-control member 150 with respect to the body. In the example of Figure 1, the bolt-control member 150 is arranged to be locked in the first position, helping to prevent the hook bolt 100 being driven to the unlatched position. This may provide an additional way of preventing the hook bolt 100 being directly forced into the unlatched position. In this example, the bolt-control member 150 includes a lock block 152 that in its extended position engages with a fixed shoulder (not shown in the figures) of the body 190 of the latch assembly 1. In one example, the shoulder is formed on the cover (not shown) of the body 190. The lock block 152 is biased towards its extended position by compression spring 154. When the lock block 152 is forced away from its extended position, it disengages from the shoulder of the body 190, thus allowing movement of the bolt-control member 150. The lock block 152 in this example is forced to disengage by a cam 162 coupled to a lock barrel 161 of a lock assembly 160. This allows a user to unlock the bolt-control member 150 for movement from the latching position by inserting and turning a key.The bolt-control member 150 may be driven electrically, for example with a solenoid, or mechanically. In the example of Figure 1, the bolt-control member 150 is driven mechanically by the cam 162 attached to the lock barrel. This allows the single action of turning a key in the lock to both unlock the bolt-control member 150 for movement and to drive movement of the bolt-control member 150.The latch assembly 1 may also be provided with an anti-slam mechanism that prevents the hook bolt 100 being moved to the latched position when the latch assembly 1 is not near the keeper, e.g. when a sliding door bearing the latch assembly 1 is open. In the example of Figure 1, the anti-slam mechanism includes the tongue 182,compression spring 181 and anti-slam block 180 that engages with a recess 153 of the bolt-control member 150. The tongue 182 is arranged to push the anti-slam block 180 back against the bias of the compression spring 181 when the tongue 182 is pressed towards its retracted position by part of the keeper or the member to which the member bearing the latch assembly 1 is latched - e.g. the frame of a sliding door. The anti-slam block 180 is therefore held away from the recess 153 and the bolt-control member 150 is free to move between its latched and unlatched positions. When the tongue 182 is extended, the anti-slam block 180 will move into the recess 153 when the bolt-control member 150 is in the unlatched position, thereby retaining the boltcontrol member 150 in this position as long as the tongue 182 is extended. By preventing the hook bolt 100 from being extended unless the latch assembly 1 is engaged with the keeper, the latch may be protected from being damaged due to a door being slammed while the hook bolt 100 is in the latched position, or similar incidents when the latch is used on other members.The geometry of the latch assembly 1 will now be described with reference to Figure 2. In this example, the keeper 200 includes a keeper plate 210 having a keeper surface 211. The keeper 200 may be in the form of a strike in which the keeper plate 210 is a strike plate. The latch assembly 1 is arranged to move with respect to the keeper 200 in direction 222 as the latched member moves linearly in this direction. In the scenario in which the latch assembly 1 is attached to a sliding door and the keeper 200 is attached to a frame of the door, this corresponds to the door sliding open. When the hook bolt 100 moves from the latched position towards the unlatched position, it follows the arcuate path 220, the direction of the path being indicated by the arrow. The positive component 224 of the arcuate path 220 that is perpendicular to the direction of movement 222 defines a second direction 221. Informally, this direction 221 could be thought of as the direction in which the hook bolt 100 initially “lifts” during unlatching. A line 223 parallel to the direction of movement of the door and through the pivot point 140 is also shown.The latch assembly 1 is arranged such that the latching surface 111 engages the keeper surface 211 at a point separated from the line 223 in the direction 221, i.e. in the region 211a “above” the line 223. Note that the part of the latching surface 111 that is above the line 223 is not necessarily fixed and will change depending on the exactposition and angle of the hook bolt 100 and the keeper. Nonetheless, it can be seen that the hook bolt 100, as it moves from the latched position towards the unlatched position, will have a range of orientations in which it can engage with the keeper 200 in the region 211a above the line 223, even though it may also engage with the keeper 200 below the line 223 in the region 211b. If the door carrying the latch assembly 1 is pulled hard while the hook bolt 100 is latched, it would have to rotate free of the keeper beyond regions 211a and 211b to come unlatched. However, when the hook bolt 100 is engaged with the keeper 200 above the line 223, the pulling force is transmitted to the keeper 200, via the hook bolt 100, in a line through the pivot point 140 and the point(s) of engagement in the region 211a. The tangential component of the reaction force provided by the keeper 200 on the hook bolt 100 is in the opposite direction to the path 220 and will tend to pivot the hook bolt 100 back “down” towards the latched position and prevent the hook bolt 100 from being unlatched by pulling of the door along the line of movement 222.Also shown in Figure 2 is an exemplary keeper 200. Other keepers such as a loop or bar-type keeper may be used with the latch assembly 1. In the example of Figure 2, the keeper 200 includes a body 201 and a keeper plate 210, which together define a cavity 202 for receiving the hook bolt 100. The keeper 200 in this form may be considered a strike in which the keeper plate 210 is a strike plate.The keeper plate 210 has a keeper surface 211 for engaging with the latching surface 111 of the hook bolt 100. The keeper surface 211 may have a curvature less than that of the arcuate path that the latching surface 111 of the hook bolt 100 follows when moving from its latched position towards its unlatched position. The curvature referred to here is the curvature in the plane of the arcuate path 220. This may reduce the chance of the hook bolt 100 catching on the keeper plate 210 when being unlatched and allow easy unlatching of the hook bolt 100, especially in the case where the door (or other member) is pulled towards its open position during unlatching. In the example of Figure 2, the keeper surface 211 is flat in this plane.The latching assembly 1 and keeper 200 may be provided together as a kit or separately.Figures 3 and 4 show the operation of the latch assembly 1 as it moves towards the unlatched configuration from the latched configuration of Figure 1. As can be seen in the partly retracted configuration of Figure 3, the lock barrel 161 has been turned and the cam 162 is pressing on the lock block 152, causing it to retract and disengage from the shoulder of the base. The cam 162 has also made contact with the bolt-control member 150 at unlatching drive shoulder 155 and begun to move the bolt-control member 150 towards the unlatched position. The lug 151 of the bolt-control member 150 has made contact with the hook bolt 100 and begun moving it towards the unlatched position.The lug 151 has moved upwards along with the rest of the bolt-control member 150, thereby no longer acting as a detent against movement of the hook bolt 100 towards the unlatched position. This allows the hook bolt 100 to move around the pivot point 140.The anti-slam block 180 has not entered the recess 153 at this point and the spring 181 is compressed.In the retracted configuration of Figure 4, the cam 162 has driven the bolt-control member 150 to its unlatched position, and the lug 151 has consequently driven the hook bolt 100 to its unlatched position. In this position, the anti-slam block 180 has moved into the recess 153 and the tongue 182 is extended. The anti-slam block 180 will remain in the recess 153, preventing movement of the bolt-control member 150, until the tongue 182 is pressed into the latch assembly 1, for example due to the door being closed.For driving the bolt-control member 150, and consequently the hook bolt 100, from the unlatched position to the latched position, the cam 162 pushes against latching drive shoulder 156.Figure 5 shows the detent and movement driver of the bolt-control member and the detent surface and driving surfaces of the hook bolt of Figure 1 in detail. The lug 151 forms both the detent and the movement driver in this example. In the latched configuration shown, the lug 151 provides a detent against movement of the hook boltby contacting and preventing movement of the detent surface 132 of the protrusion 131. As can be seen, for the hook bolt 100 to pivot towards the unlatched position, the detent surface 132 would have to move substantially laterally towards the bolt-control member 150, but this movement is prevented by the detent.As the bolt-control member 150 moves towards the unlatched position, the lug 151 moves towards the unlatching drive surface 134 of the hook bolt. Note that the lug 151 and unlatching drive surface 134 are only partly shown in this figure as they are partly obscured by the main body of the bolt-control member 150. By pushing on the unlatching drive surface 134, the lug 151 can drive the hook bolt towards the unlatched position.In the unlatched position, the hook bolt will have pivoted into the configuration shown in Figure 4. In this configuration, the protrusion 131 is located in the path that the lug 151 would take were it to move towards the latched position, i.e. “below” it in the orientation of Figures 4 and 5. When the bolt-control member 150 moves back towards the latched position, the lug 151 will contact the protrusion 131 at the latching drive surface 133 and drive the hook bolt back to its latched configuration. Note that the detent surface 132 and latching drive surface 133 are only generally indicated and may in practice overlap and change throughout the driving and detent acts.The use of a relatively large lug 151 may reduce the potential for damage to a latch assembly 1 by spreading the load across a relatively large area and the inherent strength provided by a larger driving / detent member.There are thus provided a latch assembly, a keeper and a kit that allow easy unlatching of a hook bolt, reduce the potential for damage to a latch assembly, and protect against unauthorised attempts to unlatch the hook bolt via direct forcing of the bolt or pulling of the door.InterpretationThe discussion of any existing technology should not be construed as an admission that such technology forms part of the common general knowledge.The term “comprises” and other grammatical forms is intended to have an inclusive meaning unless otherwise noted. That is, they should be taken to mean an inclusion of the listed components, and possibly of other non-specified components or elements.10       The present invention has been illustrated by the description of some embodiments.While these embodiments have been described in detail, this should not be taken to restrict or limit the scope of the claims to those details. Additional advantages and modifications will readily appear to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details of the illustrative examples15       shown and described. Accordingly, modifications may be made to the details withoutdeparting from the spirit or scope of the general inventive concept.

Claims

CLAIMS1. A latch assembly for latching to a keeper, the latch assembly adapted for use on a member arranged for linear movement in a first direction with respect to the keeper, the latch assembly comprising:a body; anda hook bolt pivotally coupled to the body at a pivot point, the hook bolt comprising a latching surface adapted to engage with the keeper in a latched position;wherein the hook bolt is adapted to pivot from the latched position towards an unlatched position such that the latching surface moves in an arcuate path having a positive linear component in a second direction perpendicular to the first direction;wherein the latching surface has a curvature in a plane in which the hook bolt moves less than the curvature of the arcuate path; andwherein at least part of the latching surface is adapted to engage with the keeper at a point separated in the second direction from a line that passes through the pivot point and that is parallel to the first direction.

2. The latch assembly of claim 1, wherein the latching surface has a profile in a plane in which the hook bolt moves selected from the group consisting of: substantially linear, substantially convex, or substantially concave.

3. The latch assembly of claim 2, wherein the profile of the latching surface in a plane in which the latching surface moves between the latched and unlatched positions is substantially linear.

4. The latch assembly of claim 3, wherein the hook bolt comprises a hook portion comprising the latching surface and an arm from which the hook portion extends, and wherein the latching surface has a proximal end proximate the arm and a distal end distal to the arm, the distal end being nearer to the pivot point than the proximal end is.

5. The latch assembly of any one of claims 1-4, further comprising a bolt-control member adapted to move between a first position and a second position to control movement of the hook bolt between the latched position and the unlatched position.

6. The latch assembly of claim 5, wherein the bolt-control member comprises a detent adapted to engage with a detent surface of the hook bolt when the hook bolt is in the latched position and the bolt-control member is in the first position to prevent movement of the hook bolt from the latched position to the unlatched position.

7. The latch assembly of claim 6, wherein the bolt-control member is arranged to move in a third direction between the first and second positions, and wherein the detent and detent surface are arranged such that a force applied by the hook bolt to the detent, via the detent surface, under attempted movement of the hook bolt from the latched position to the unlatched position while the bolt-control member is in the first position, has a substantial component perpendicular to the third direction.

8. The latch assembly of claim 6 or claim 7, wherein the bolt-control member comprises a movement driver adapted to engage with one or more drive surfaces of the hook bolt to drive the movement of the hook bolt between the latched and unlatched positions.

9. The latch assembly of claim 8, wherein the detent and movement driver of the bolt-control member are both formed by one protrusion of the bolt-control member.

10. The latch assembly of claim 9, wherein the detent surface and one of the driving surfaces of the hook bolt are both surfaces of one protrusion of the hook bolt.

11. The latch assembly of any one of claims 5-10, wherein the hook bolt comprises a hook bolt body located about the pivot point, and wherein the detent surface is a surface of the hook bolt body.

12. The latch assembly of claim 11, when dependent on claim 8, wherein one or more of the drive surfaces are surfaces of the hook bolt body.

13. The latch assembly of any one of claims 1-12, further comprising a locking mechanism adapted to lock the hook bolt in the latched position.

14. The latch assembly of claim 13, when dependent on claim 5, wherein the locking mechanism is adapted to lock the hook bolt in the latched position by locking the bolt-control member in the first position.

15. A keeper for a latch assembly of a member arranged for linear movement in a first direction with respect to the keeper, the keeper comprising:a body; anda keeper plate;wherein the body and the keeper plate define a cavity for receiving a hook bolt of the latch assembly and allowing movement of a latching face of the hook bolt in an arcuate path;wherein the keeper plate comprises a keeper surface for engaging with a latching surface of the hook bolt; andwherein the latching surface has a curvature in a plane in which the latching face of the hook bolt moves that is less than the curvature of the arcuate path.

16. The keeper of claim 15, wherein the keeper surface is substantially flat.

17. A kit comprising the latch assembly of any one of claims 1-14 and the keeper of any one of claims 15-16.See Detail A211a211bDetail A

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