DK201200500A

DK201200500A - Window latch

Info

Publication number: DK201200500A
Application number: DK201200500A
Authority: DK
Inventors: Drucker Mikkel; Lind Terkel; Vestergaard Klaus Solberg
Original assignee: Lindrucker Aps
Priority date: 2012-08-10
Filing date: 2012-08-10
Publication date: 2014-02-11
Also published as: WO2014023310A3; WO2014023310A2

Abstract

In order to prevent a burglar to escape through a window during an attempt to do a rubbery, the invention suggests a window latch consisting of housing (3) mounted on a window frame (18, 19, 19a, 19c) or a mullion (2, 20) or a transome (19b) and a bracket (12) mounted on a window sash (1, 23b, 23c). The housing accommodates a bolt (6) that is slideable in a channel (13) in the housing, where the housing has a hole (10) for receiving the bracket (12). In an embodiment the bracket abuts the bottom. The hole (10) has an axis that is perpendicular to the axis of the bolt (6). In an embodiment the windows latch is operated through a coding system consisting of a plurality of collars (8) with slots that fits to spigots on the bolt (6). The advantage of the invention is that it is extremely difficult to open the latch with tools normally available to burglars.

Description

This invention relates to a window latch consisting of a housing having a bottom, said housing is mounted on a window frame or on a mullion or on a transome or on a window sash and a bracket mounted on a window frame or on a mullion or on a transome or on a window sash, where the housing has a longitudinal channel accommodating a moveable bolt adapted to engage a hole in the bracket thereby locking the bolt to the bracket.This invention relates to a window latch consisting of a housing having a bottom, said housing is mounted on a window frame or on a mullion or on a transome or on a window sash and a bracket mounted on a window frame or on a mullion or on a transome or on a window sash, where the housing has a longitudinal channel accommodating a movable bolt adapted to engage a hole in the bracket thereby locking the bolt to the bracket.

As it is well known burglary takes place every day in each and every country in the world. F. inst. in Denmark having a population about 5.500.000 people some 45.000 burglaries takes place during 1 year in private homes. A lot of these burglary cases are never solved inter alia for the reason that the burglar has easy access to escape from the building he tries to rub.As it is well known burglary takes place every day in each and every country in the world. F. inst. In Denmark having a population of about 5.500.000 people some 45.000 burglaries takes place during 1 year in private homes. A lot of these burglary cases are never solved inter alia for the reason that the burglar has easy access to escape from the building he tries to rub.

For a burglar it is first of all important that he can do his job in silence (not crashing windows), in darkness and have access to escape routes. US patent no. 3,367,263 deals with a combination lock window latch intended to prevent anyone to open a window from inside a building.For a burglar it is first of all important that he can do his job in silence (not crashing windows), in darkness and have access to escape routes. US patent no. 3,367,263 deals with a combination lock window latch intended to prevent anyone from opening a window from inside a building.

Basically this latch will create troubles for a burglar that is disturbed during his burglar attempt.Basically this latch will create troubles for a burglar that is disturbed during his burglar attempt.

However this window latch has the drawback that it is quite simple to open. F. ins. by using a screwdriver, it is possible to open the latch, because it is possible to twist the part of the latch form each other.However, this window latch has the drawback that it is quite simple to open. F. ins. by using a screwdriver, it is possible to open the latch, because it is possible to twist the part of the latch form each other.

In this latch the end of the bolt is in contact with a supporting part of the, bracket itself.In this latch the end of the bolt is in contact with a supporting part of the bracket itself.

For that reason it is a purpose with the invention to make a window latch that is much stronger in preventing opening the latch from inside as well as outside of a building, using common tools, such as a screwdriver, a crowbar or a drill.For that reason, it is an object of the invention to make a window latch that is much stronger in preventing opening the latch from inside as well as outside of a building, using common tools such as a screwdriver, a crowbar or a drill.

The purpose is solved by a window latch defined in the introductory part of claim 1, that is characterized in that the housing has a hole adapted to receive the bracket, or that the bracket abuts the bottom.The purpose is solved by a window latch defined in the introductory part of claim 1, which is characterized in that the housing has a hole adapted to receive the bracket, or that the bracket abuts the bottom.

In this way the bracket is hidden in the housing and not accessible when using normal burglar tools.In this way the bracket is hidden in the housing and not accessible when using normal burglar tools.

With as stated in claim 2, that a glazing bead is mounted between the bracket and the window sash, the latch is further improved in the sense it is more difficult to get access to the latch.With as stated in claim 2, that a glazing bead is mounted between the bracket and the window sash, the latch is further improved in the sense it is more difficult to access the latch.

Preferred as stated in claim 3, that the hole in the housing has an axis that is perpendicular to the longitudinal direction of the bolt, an even stronger latch is obtained.Preferred as stated in claim 3, that the hole in the housing has an axis which is perpendicular to the longitudinal direction of the bolt, an even stronger latch is obtained.

By as stated in claim 4, that the channel has a bottom and that the hole is positioned in a distance from the bottom and as stated in claim 5, that the hole in the bracket has a diameter that is the similar to the diameter of the bolt, a very strong connection between the bolt and the bracket is obtained.As stated in claim 4, that the channel has a bottom and that the hole is positioned at a distance from the bottom and as stated in claim 5, that the hole in the bracket has a diameter that is similar to the diameter of the bolt, a very strong connection between the bolt and the bracket is obtained.

In order to lock or unlock the window latch in an easy way, it is preferred as stated in claim 6, that the housing accommodates a plurality of collars each having central holes each of which collars has slots adapted to corporate with spigots on the surface of the bolt in order to lock or unlock the latch.In order to lock or unlock the window latch in an easy way, it is preferred as stated in claim 6, that the housing accommodates a plurality of collars each having central holes each of which collars has slots adapted to corporate with spigots on the surface of the bolt in order to lock or unlock the latch.

In order to adapt the window latch to be used in various forms of windows it is advantageous, if as stated in claim 7, that the bracket has a thin part and a thick part, and where the thin part has an outer thread and the thick part has a channel with an inner thread, or that the thin part has an inner thread in a channel and the thick part has an outer thread, or as stated in claim 8, that the bolt is terminated by a thread adapted to be fixed to the window sash, and finally as stated in claim 9, that two housings are mounted on each side of the mullion by fastening means consisting of a bushing and two bolts.In order to adapt the window latch to be used in various forms of windows it is advantageous, as stated in claim 7, that the bracket has a thin part and a thick part, and where the thin part has an outer thread and the thick part has a channel with an inner thread, or that the thin part has an inner thread in a channel and the thick part has an outer thread, or as stated in claim 8, that the bolt is terminated by a thread adapted to be fixed to the window sash, and finally as stated in claim 9, that two housings are mounted on each side of the mullion by fastening means consisting of a bushing and two bolts.

In order to fulfil regulative rules it is an advantage, if as stated in claim 10, that a plate is positioned between the sash and the housing, said plate has an area of 1500 mm2 and a minimum hardness of 60 HRC and a depth of hardening of 0,3 mm.In order to fulfill full regulatory rules, it is an advantage, as stated in claim 10, that a plate is positioned between the sash and the housing, said plate has an area of 1500 mm2 and a minimum hardness of 60 HRC and a depth of hardening or 0.3 mm.

As stated in claim 11, that the bracket has a bending of 90°, it is possible to use the latch in connection with double windows, that is not separated with a mullion. A further advantageous embodiment of the invention is defined in claim 12.As stated in claim 11, that the bracket has a bending of 90 °, it is possible to use the latch in connection with double windows, which is not separated with a mullion. A further advantageous embodiment of the invention is defined in claim 12.

The invention will now be more fully explained in connection with the drawing in which fig. 1 illustrates the window latch according to the invention, fig. 2 illustrates a cross section of a latch according to the invention, fig. 3 illustrates the window latch according to the invention in another embodiment. fig. 4 illustrates the housing and the bracket separated from each other, fig. 5 illustrates the bracket in a first embodiment, fig. 6 illustrates the bracket in an alternative embodiment. fig. 7 a front view of a window, whereas fig. 8 illustrates a cross section through line 7-7 on fig. 7.The invention will now be more fully explained in connection with the drawing in which fig. 1 illustrates the window latch according to the invention, fig. 2 illustrates a cross section of a latch according to the invention, fig. 3 illustrates the window latch according to the invention in another embodiment. FIG. 4 illustrates the housing and the bracket separated from each other, fig. 5 illustrates the bracket in a first embodiment, fig. 6 illustrates the bracket in an alternative embodiment. FIG. 7 a front view of a window, whereas fig. 8 illustrates a cross section through line 7-7 on fig. 7th

On fig. 1, 1 designates a window sash and 2 a window mullion on which a window latch according to the invention is installed. 3 designate a housing mounted on the window mullion. On window sash 1, a bracket 12, see fig. 2 and fig. 3, is led from a glazing bead 4 through the window sash 1 into the housing 3.In fig. 1, 1 designates a window sash and 2 a window mullion on which a window latch according to the invention is installed. 3 designate a housing mounted on the window mullion. On window sash 1, a bracket 12, see fig. 2 and FIG. 3, is led from a glazing bead 4 through the window sash 1 into the housing 3.

It is noted that the latch can also be mounted on a window frame 18, 19, 19a, 19c or a transome 19b, cf. fig 7.It is noted that the latch can also be mounted on a window frame 18, 19, 19a, 19c or a transome 19b, cf. Fig. 7.

Fig. 2 illustrates a cross section of a window latch according to the invention. Here 13 designate a channel in the housing 3 and 3a the bottom of the housing 3.FIG. 2 illustrates a cross section of a window latch according to the invention. Here 13 design a channel in the housing 3 and 3a the bottom of the housing 3.

The channel has a bottom 13a. In the channel a moveable bolt 6 having an end closure 5a can be led up and in the channel in the housing 3 between a contact surface 7 and the bottom 13a.The channel has a bottom 13a. In the channel a movable bolt 6 having an end closure 5a can be led up and in the channel in the housing 3 between a contact surface 7 and the bottom 13a.

The bolt is surrounded by three collars 8, and forms a coded latch which under a certain coding, by placing the collars correct, allows moving the bolt 6 in a well-known way.The bolt is surrounded by three collars 8, and forms a coded latch which under a certain coding, by placing the collars correctly, allows moving the bolt 6 in a well-known way.

This coding function can be arranged in such a way that a spring (not shown on the drawing) will activate the bolt to an unlocked position when a correct code is applied to the collars.This coding function can be arranged in such a way that a spring (not shown on the drawing) will activate the bolt to an unlocked position when a correct code is applied to the collars.

Here it is also mentioned that the bolt 6 is equipped with spigots on its surface, whereas the collars are equipped with slots. Slots and spigots are not shown on fig. 2. 10 designate a hole that is arranged in the housing 3, a distance from the bottom 13a of the channel 13.Here it is also mentioned that the bolt 6 is equipped with spigots on its surface, whereas the collars are equipped with slots. Slots and spigots are not shown on fig. 2. 10 design a hole arranged in housing 3, a distance from the bottom 13a of the channel 13.

As can be seen, the channel 13 has a direction that is perpendicular to the direction of the hole 10. A metal plate 4a is placed between the sash 1 and the housing 3.As can be seen, channel 13 has a direction perpendicular to the direction of hole 10. A metal plate 4a is placed between the sash 1 and the housing 3.

This plate has a minimum hardness of 60 HRC and depth of hardening of 0,3 mm. Further the area of the plate 1500 mm2.This plate has a minimum hardness of 60 HRC and depth of hardening of 0.3 mm. Further the area of the plate 1500 mm2.

It is also noted that the plate 4a can be integrated as a part of the whole housing. 11 designates a hole in a bracket 12, see also fig. 3.It is also noted that plate 4a can be integrated as part of the whole housing. 11 designates a hole in a bracket 12, see also fig. Third

This plate enforces the strength of the latch construction in the sense it is very difficult to open the latch by using a drill.This plate enforces the strength of the latch construction in the sense it is very difficult to open the latch by using a drill.

The fig. 3 embodiment differs from that in fig. 2, that the bracket 12 does not penetrate the hole 10 in the housing but simply abuts the bottom 3b on the housing.The fig. 3 embodiment differs from that in FIG. 2, that the bracket 12 does not penetrate the hole 10 in the housing but simply abuts the bottom 3b on the housing.

Coming now to fig. 4.Coming now to fig. 4th

Here the housing 3 is seen separated from the bolt 12. The bolt 12 has a thick part 9 and a thin part 9a connected via a collar 9c.Here the housing 3 is seen separated from the bolt 12. The bolt 12 has a thick part 9 and a thin part 9a connected via a collar 9c.

In the thick part 9, the hole 11 is arranged. The end of the thin part is terminated by a head 5. Preferably the hole 11 is a through-going hole and has a diameter similar to the outer diameter of the bolt 6.In the thick part 9, the hole 11 is arranged. The end of the thin part is terminated by a head 5. Preferably the hole 11 is a through-going hole and has a diameter similar to the outer diameter of the bolt 6.

An alternative of the bolt 12 is illustrated on fig. 5.An alternative of the bolt 12 is illustrated in FIG. 5th

Here it is seen that the thin part has an outer thread 14a, whereas the thick part has a channel 13 with an inner thread 13a in which the thin part can be moved.Here it is seen that the thin part has an outer thread 14a, whereas the thick part has a channel 13 with an inner thread 13a in which the thin part can be moved.

Of course it is also possible that the thin part can have an inner thread and the thick part an outer thread.Of course, it is also possible that the thin part can have an inner thread and the thick part an outer thread.

This allows adapting the bolt 12 to various windows sashes having different thickness.This allows adapting the bolt 12 to various windows sashes having different thicknesses.

Fig. 6 shows another alternative of the bolt 12.FIG. 6 shows another alternative of the bolt 12.

Here the thin part 9a is formed as a screw, having a thread 16, that can be screwed directly in a window sash of wood.Here the thin part 9a is formed as a screw, having a thread 16, which can be screwed directly into a window sash of wood.

The function of the window latch will now be explained.The function of the window latch will now be explained.

When the bolt 12 is introduced through the window sash into the hole 10 of the of the housing 3, and the bolt 6 in the housing 3 is placed in the upper part of the channel 13 (latch unlocked), the bolt is moved down through the hole 11 on the thick part 9 of the bolt 12.When the bolt 12 is introduced through the window sash into the hole 10 of the housing 3, and the bolt 6 in the housing 3 is placed in the upper part of the channel 13 (latch unlocked), the bolt is moved down through the hole 11 on the thick part 9 of the bolt 12.

In this way a strong interconnection between the bolt 12 and the bolt 6 in the housing is assured, said interconnection is very difficult to separate, because it is not possible to use an ordinary hand tool to twist the parts from each other.In this way a strong interconnection between the bolt 12 and the bolt 6 in the housing is assured, said interconnection is very difficult to separate because it is not possible to use an ordinary hand tool to twist the parts from each other.

In fig. 7 a double window having four window glasses two of which are denoted 23, 23a. These glasses are fixed to sashes two of which are denoted 23b, 23c. A middle mullion 20 (post) separates the left pair of windows from the right pair of windows. A transome 19b connects the upper small windows with the lower bigger windows. 18, 19, 19a, 19c designates frames (jambs).In FIG. 7 a double window having four window glasses two of which are denoted 23, 23a. These glasses are fixed to sashes two of which are denoted 23b, 23c. A middle mullion 20 (post) separates the left pair of windows from the right pair of windows. A transome 19b connects the upper small windows with the lower bigger windows. 18, 19, 19a, 19c designates frames (jambs).

Fig. 8 shows a cross section along line 7-7, showing how the latch according to the invention is used.FIG. 8 shows a cross section along line 7-7, showing how the latch according to the invention is used.

On the mullion 20, two housings 3 are mounted by fastenings means 24, 25. These fastenings means consist of a bushing 24 and screws 25, 26, that can be screwed in the bushing 24. Two bolts with holes 11 are as explained earlier mounted on the window sashes.On the mullion 20, two housings 3 are mounted by fastening means 24, 25. These fastening means consist of a bushing 24 and screws 25, 26, which can be screwed into the bushing 24. Two bolts with holes 11 are as previously explained mounted on the window sashes.

The function of this window latch is similar to that explained earlier.The function of this window latch is similar to that explained earlier.

Finally it is noted that the latch according to the invention is also useable in connection with a double window illustrated in fig, 8 but without providing the mullion between the windows.Finally, it is noted that the latch according to the invention is also usable in connection with a double window illustrated in fig, 8 but without providing the mullion between the windows.

In that case the housing could be fixed on the right window sash and the bracket on the left window sash.In that case the housing could be fixed on the right window sash and the bracket on the left window sash.

In other words the bracket can "reach" the hole in the bracket, when the window sashes abuts each other.In other words, the bracket can "reach" the hole in the bracket when the window sashes abuts each other.

In this case the bracket should be formed with a bending of 90°.In this case the bracket should be formed with a bending of 90 °.

If the windows are suspended on hinges as shown on fig. 8, then the embodiment of fig. 3 could be used, whereas if the windows are slideable, then both the fig 2 and the fig. 3 embodiment could be used.If the windows are suspended on hinges as shown on fig. 8, then the embodiment of fig. 3 could be used, whereas if the windows are slideable, then both the fig 2 and the fig. 3 embodiment could be used.

Claims

1. Window latch consisting of a housing (3) having a bottom (3a,3b), said housing is mounted on a window frame (18, 19, 19a, 19c) or on a mullion (2, 20) or on a transome (19b) or on a window sash (1, 23b, 23c) and a bracket (12) mounted on a window frame (18, 19, 19a, 19c) or on a mullion (2, 20) or on a transome (19b) or on a window sash, where the housing (3) has a longitudinal channel (13) accommodating a moveable bolt (6) adapted to engage a hole (11) in the bracket thereby locking the bolt (6) to the bracket (12), characterized in that the housing (3) has a hole (10) adapted to receive the bracket, or that the bracket abuts the bottom (3b).

2. Window latch according to claim 1, characterized in that a glazing bead (4) is mounted between the bracket (12) and the window sash (1).

3. Window latch according to claim 1 - 2, characterized in that the hole (10) in the housing (3) has an axis that is perpendicular to the longitudinal direction of the bolt.

4. Window latch according to claim 1 - 3, characterized in that the channel (13) has a bottom (13a) and that the hole (10) is positioned in a distance from the bottom.

5. Window latch according to claim 1 - 4, characterized in that the hole (11) in the bracket (12) has a diameter that is the similar to the diameter of the bolt (6).

6. Window latch according to claim 1-5, characterized in that the housing accommodates a plurality of collars (8) having central holes each of which collars has slots adapted to corporate with spigots on the surface of the bolt (6) in order to lock or unlock the latch.

7. Window latch according to claim 1-6, characterized in that the bracket has a thin part (9a) and a thick part (9), and where the thin part has an outer thread (14a) and the thick part has a channel (13) with an inner thread (13a), or that the thin part has an inner thread in a channel and the thick part has an outer thread.

8. Window latch according to claim 1-7, characterized in that the bolt (12) is terminated by a screw (16) with a thread.

9. Window latch according to claim 1 - 8, characterized in that two housings are mounted on each side of the mullion by fastening means consisting of a bushing (24) and two bolts (25, 26).

10. Window latch according to claim 1-9, characterized in that a plate (4a) is positioned between the sash (1) and the housing (3), said plate has an area of 1500 mm2 and a minimum hardness of 60 HRC and a depth of hardening of 0,3 mm.

11. Window latch according to claim 1 - 10, characterized in that the bracket has a bending of 90°.

12. Window latch according to claim 1-11, characterized in that the housing and the bracket is made of metal or alloys thereof.