[0001] The invention relates to a lock comprising a lock part for mounting against an inner
side of a door, in which an at least substantially rod-like bolt provided with a bevelled
side is slidably mounted, and a staple part for mounting against a door jamb provided
with an opening into which the bolt drops when a door is closed.
[0002] Locks of this type are generally known. They are for instance applied in substantially
any front door in order to achieve that the front door locks automatically when it
is pulled shut. The bevelled side here comes into contact with an edge of the staple
part, and the bolt is pressed inward counter to the action of a spring up to the moment
at which the bolt can drop into the opening. The drawback of the known lock is that
a plate-like object can be pushed between the door jamb and the door such that an
edge of this plate-like object comes to rest against the bevelled side of the bolt.
If the plate-like object is now pushed further inward the bolt then slides into the
lock part counter to the action of the spring, and the door can be opened.
[0003] The lock according to the invention obviates this drawback and has the feature that
the bolt has a length such that the bevelled side is positioned at least substantially
wholly inside the staple part when the door is closed. In this way it is possible
in simple manner to prevent the bolt being pressed into the lock part by a plate-like
object since the force exerted by the plate-like object is directed perpendicularly
of a possible direction of movement of the bolt.
[0004] During fitting of the lock according to the invention it is important to mount the
staple part such that on the one hand an edge of the staple part only just comes in
contact with the bevelled side and that on the other the bevelled side can disappear
almost completely into the staple part. An advantageous embodiment of the lock according
to the invention which can significantly simplify fitting has the feature that an
edge of the staple part which is contacted by the bolt during closing of the door
is provided with a rounded portion. The rounded portion preferably has a radius here
of at least 5 millimetres.
[0005] An advantageous alternative embodiment has the feature that a transition from a side
of the at least substantially rod-like bolt to the bevelled side is provided with
a rounded portion. As a result of the rounded portion the bolt will on the one hand
be pressed into the lock part by an edge of the staple part during closing of the
door, while it is on the other hand the case that a plate-like object still lies substantially
perpendicularly of a possible movement of direction of the bolt. It is of course also
possible to provide an edge of the staple part as well as a transition from a side
of the at least substantially rod-like bolt to the bevelled side with a rounded portion.
[0006] The invention also relates to a modification package for a lock consisting of a lock
part and a staple part, whereby it becomes impossible to open the lock by inserting
a plate-like object between the door and the door jamb. For this purpose the modification
package must comprise at least an at least substantially rod-like bolt provided with
a bevelled side, and the bolt must have a length such that the bevelled side can be
positioned at least substantially wholly inside the staple part.
[0007] An advantageous embodiment of the modification package which can significantly simplify
fitting of the modified lock has the feature that a transition from a side of the
at least substantially rod-like bolt to the bevelled side is provided with a rounded
portion.
[0008] A further advantageous embodiment of the modification package has the feature that
a side of the bolt remote from the bevelled side is provided with a recess which can
co-act with a stop arranged on or in a cover of the lock part so that the cover does
not have to be replaced.
[0009] An advantageous alternative embodiment has the feature that the modification package
also comprises a staple part provided with an edge with a rounded portion having a
radius of at least 5 millimetres. It is of course also possible in a modification
package to provide an edge of the staple part as well as a transition from a side
of the at least substantially rod-like bolt to the bevelled side with a rounded portion.
[0010] The invention will now be further elucidated with reference to the following figures,
in which:
- Fig. 1
- is a cross-sectional view of a prior art lock;
- Fig. 2
- is a cross-sectional view of a possible embodiment of a lock according to the invention;
- Fig. 3
- is a cross-sectional view of an alternative embodiment of a lock according to the
invention;
- Fig. 4
- is a cross-sectional view of a further alternative embodiment of a lock according
to the invention.
Fig. 1 is a cross-sectional view of a prior art lock, consisting of a lock part 1
which can be mounted on a door 2 and a staple part 3 which can be mounted on a door
jamb 4. Lock part 1 comprises a bolt 5 which drops into an opening 6 when the door
is pulled shut, after which the door is closed and locked. In order to open the door
again from the inside a handle 7 is provided with which bolt 5 can be pulled out of
opening 6 via a pull rod 8 counter to the action of a spring 9. The free stroke of
bolt 5 is limited here by a rib 10 which is pressed into a cover 13 of lock part 1.
Generally provided for the purpose of opening the door from the outside is a cylinder
lock (not shown) via which bolt 5 can also be pulled out of opening 6. In order to
allow bolt 5 to drop smoothly into opening 6 during closing of door 2, bolt 5 is provided
with a bevelled side 12 which makes contact with staple part 3 during closing and
which is pressed into lock part 1 by staple part 3 counter to the action of spring
9. It is this bevelled side 12 which also makes it possible for the lock to be opened
relatively easily from the outside by a burglar. It is sufficient here to slide in
a flexible plate-like object 13 via a gap between door 2 and door jamb 4 until plate-like
object 13 rests against bevelled side 12. By now pressing forcefully on plate-like
object 13 the bolt 10 is pressed into lock part 1 counter to the action of spring
9, and the door can be opened.
Fig. 2 is a cross-sectional view of a possible embodiment of a lock according to the
invention, likewise consisting of a lock part 1 which can be mounted on a door 2 and
a staple part 3 which can be mounted on a door jamb 4. Lock part 1 comprises a bolt
5 which drops into an opening 6 when the door is pulled shut, after which the door
is closed and locked. In order to open the door again from the inside a handle 7 is
provided with which bolt 5 can be pulled out of opening 6 via a pull rod 8 and counter
to the action of a spring 9. The free stroke of bolt 5 is limited here by a rib 10
which is pressed into a cover 13 of lock part 1. Generally provided for the purpose
of opening the door from the outside is a cylinder lock (not shown) via which bolt
5 can also be pulled out of opening 6. In order to allow bolt 5 to drop smoothly into
opening 6 during closing of door 2, bolt 5 is provided with a bevelled side 12 which
makes contact with staple part 3 during closing and which is pressed into lock part
1 by staple part 3 counter to the action of spring 9. Compared to the bolt shown in
Fig. 1 however, bolt 5 takes a lengthened form, whereby bevelled side 12 is wholly
enclosed by staple part 3 and chamfering is no longer present in a gap between lock
part 1 and staple part 3. This makes it impossible to open the lock by sliding in
a plate-like object 13 via a gap between door 2 and door jamb 4. Mounting staple part
3 such that bevelled side 12 drops just inside staple part 3 achieves that, as is
usual, bolt 5 is pressed into lock part 1 by staple part 3 during closing of door
2. In order to enable a greater free stroke of bolt 5, bolt 5 is provided with a recess
14 into which rib 10 can partially fall. It may moreover be necessary to displace
a pin 15 which determines the length of spring 9 in order to enable a greater stroke
of bolt 5.
Fig. 3 is a cross-sectional view of an alternative embodiment of a lock according
to the invention, which embodiment wholly corresponds to the embodiment shown in Fig.
2, but wherein an edge 16 of staple part 3 is provided with a radius which simplifies
pressing of bolt 5 into lock part 1 during closing of the door. More particularly,
the positioning of staple part 3 relative to staple part 1 is less critical. Edge
16 has a radius here of for instance 8 millimetres and preferably a radius greater
than 5 millimetres.
Fig. 4 is a cross-sectional view of a further alternative embodiment of a lock according
to the invention, which embodiment wholly corresponds to the embodiment shown in Fig.
2 and wherein an edge 16 of staple part 3 is provided with a radius which simplifies
pressing of bolt 5 into lock part 1 during closing of the door. A transition 17 from
a side of bolt 5 to bevelled side 12 of bolt 5 is moreover provided with a radius
whereby bolt 5 is on the one hand pressed smoothly into lock part 1 by edge 16 of
staple part 3 during closing of the door, while it is on the other hand the case that
a plate-like object still lies substantially perpendicularly of a possible direction
of movement of the bolt, so that the lock cannot be opened in this manner.
[0011] For existing locks it is possible to mount a new lengthened bolt 5, if desired in
combination with a new staple part 3, and possibly with a modified pull rod 8 in which
pin 15 is arranged at a different location in order to prevent the lock being opened
using a plate-like object.
1. Lock, comprising a lock part for mounting against an inner side of a door, in which
an at least substantially rod-like bolt provided with a bevelled side is slidably
mounted, and a staple part for mounting against a door jamb provided with an opening
into which the bolt drops when a door is closed, characterized in that the bolt has a length such that the bevelled side is positioned at least substantially
wholly inside the staple part when the door is closed.
2. Lock as claimed in claim 1, characterized in that an edge of the staple part which is contacted by the bolt during closing of the door
is provided with a rounded portion.
3. Lock as claimed in claim 2, characterized in that the rounded portion has a radius of at least 5 millimetres.
4. Lock as claimed in any of the foregoing claims, characterized in that a transition from a side of the at least substantially rod-like bolt to the bevelled
side is provided with a rounded portion.
5. Modification package for a lock consisting of a lock part and a staple part, characterized in that the modification package comprises at least an at least substantially rod-like bolt
provided with a bevelled side, and that the bolt has a length such that the bevelled
side can be positioned at least substantially wholly inside the staple part.
6. Modification package as claimed in claim 5, characterized in that a transition from a side of the at least substantially rod-like bolt to the bevelled
side is provided with a rounded portion.
7. Modification package as claimed in claim 5 or 6, characterized in that a side of the bolt remote from the bevelled side is provided with a recess.
8. Modification package as claimed in any of the claims 5-7, characterized in that the modification package also comprises a staple part provided with an edge with
a rounded portion having a radius of at least 5 millimetres.
