Claims
- 1. A door lock suitable for installation in a door that is turnable about a predetermined axis, said door lock comprising:
- a lock casing having a front plate formed with an opening,
- a latch bolt comprising a latch bolt body and a latch bolt member, the latch bolt being movable linearly in directions perpendicular to the turning axis of the door between a retracted position in which substantially the entire latch bolt is inside the lock clasing and a projecting position in which the latch bolt body is inside the lock casing and a wedge portion of the latch bolt member projects from the lock casing through the opening in the front plate, the latch bolt member extending beyond the latch bolt body in the direction of movement of the latch bolt from the retracted position towards the projecting position and being connected to the latch bolt body in a manner permitting pivotal movement of the latch bolt member relative to the latch bolt body about a pivot axis parallel to the turning axis of the door, and said wedge portion of the latch bolt member being defined by two opposite faces that converge in a direction away from the pivot axis towards an end that extends substantially parallel to said pivot axis, said opposite faces converging over substantially the entire amount by which the latch bolt member projects from the lock casing when the latch bolt is in its projecting position,
- spring means urging the latch bolt towards the projecting position, and
- dead locking means selectively operable when the latch bolt is in the projecting position to prevent movement of the latch bolt towards the retracted position.
- 2. A door lock according to claim 1, wherein the latch bolt member comprises two components that are pivotable independently of each other relative to the latch bolt body about said pivot axis.
- 3. A door lock according to claim 2, wherein each component of the latch bolt member has a wedge portion defined by two opposite faces that converge in a direction away from the pivot axis towards an end surface that extends substantially parallel to the pivot axis.
- 4. A door lock according to claim 1, wherein the latch bolt member comprises guide portions that extend substantially in the direction of the movement of the latch bolt and are spaced apart along said pivot axis, and the latch bolt body has a guide portion that extends between the guide portions of the latch bolt member and to which the latch bolt member is attached by way of its guide portions.
- 5. A door lock according to claim 4, wherein the latch bolt member is connected to the latch bolt body by a pivot shaft that extends through the guide portions of the latch bolt member and the guide portion of the latch bolt body.
- 6. A door lock according to claim 4, wherein the guide portions of the latch bolt member each comprise a protrusion extending in a direction parallel to the pivot axis, away from the latch bolt body, and having a stop surface arranged to cooperate with an inner surface of the front plate for guiding pivotal movement of the latch bolt member and defining the amount by which the latch bolt member may project from the lock casing when the latch bolt is in the projecting position.
- 7. A door lock according to claim 1, wherein the latch bolt body has upper and lower surfaces that are substantially perpendicular to the pivot axis, and is formed with a passage that extends through the lock bolt body and opens at the upper and lower surfaces, the passage being of substantial extension in the direction of movement of the latch bolt.
- 8. A door lock according to claim 1, wherein the dead locking means include a dead locking member that is pivotable relative to the lock casing, about an axis that is stationary relative to the lock casing, between a dead locking position in which the dead locking member engages the latch bolt to prevent movement of the latch bolt from the projecting position to the retracted position and a passive position in which it allows the latch bolt to be moved from its projecting position towards its retracted position.
- 9. A door lock according to claim 8, comprising second spring means urging the dead locking member towards its dead locking position, and an operation device for moving the dead locking member to its passive position against the force of the second spring means.
- 10. A door lock according to claim 8, comprising an operating shaft that is operable to move the dead locking member from its dead locking position towards its passive position.
- 11. A door lock according to claim 10, wherein the operating shaft is coupled to a force transmission lever which is pivotable within the lock casing and is drivingly engaged with the latch bolt for moving the latch bolt from its projecting position to its retracted position, and wherein pivotal movement of the force transmission lever brings about movement of the dead locking member from its dead locking position to its passive position.
- 12. A door lock according to claim 11, wherein the force transmission lever has an end, and pivotal movement of the force transmission lever when the dead locking member is in the dead locking position causes the end of the force transmission lever to engage the dead locking member and move it to its passive position.
- 13. A door lock according to claim 11, wherein the latch bolt body has upper and lower surfaces that are substantially perpendicular to the pivot axis, and is formed with a passage that extends through the lock bolt body and opens at the upper and lower surfaces, the passage being of substantial extension in the direction of movement of the latch bolt, and wherein the force transmission lever extends within the passage of the latch bolt body.
- 14. A door lock according to claim 8, comprising an auxiliary bolt having a bevelled end and movable linearly between a projecting position, in which the auxiliary bolt projects from the lock casing, and a retracted position, in which the auxiliary bolt does not project substantially from the lock casing, said auxiliary bolt, when in the projecting position, preventing movement of the dead locking member from its passive position to its dead locking position.
- 15. A door lock according to claim 14, comprising an operation device, a setting member coupled to the operation device for moving the dead locking member to its passive position, and second spring means effective against the setting member to urge the dead locking member towards its dead locking position, and wherein the auxiliary bolt engages the setting member when in the projecting position and prevents the dead locking member from being moved to its dead locking position.
- 16. A door lock according to claim 1, wherein the latch bolt body and the latch bolt member have stop surfaces which cooperate with each other to limit the range of pivotal movement of the latch bolt member relative to the latch bolt body, such that in each end position of the range one of said two opposite faces of the wedge portion of the latch bolt member is substantially parallel with the direction of linear movement of the latch bolt.
- 17. A door lock according to claim 1, comprising an auxiliary bolt spaced from the latch bolt along the pivot axis, the auxiliary bolt being movable linearly, parallel to the direction of movement of the latch bolt, between a projecting position, in which the auxiliary bolt projects from the lock casing, and a retracted position, in which the auxiliary bolt does not project substantially from the lock casing, said auxiliary bolt, when in the projecting position, preventing operation of the dead locking means.
- 18. A door lock according to claim 17, wherein the auxiliary bolt has a bevelled end, and comprising second springs means urging the auxiliary bolt towards the projecting position.
Priority Claims (1)
Number |
Date |
Country |
Kind |
871601 |
Apr 1987 |
FIX |
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Parent Case Info
This is a continuation of application Ser. No. 07/176,839 filed Apr. 4, 1988, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2240894 |
Aug 1972 |
DEX |
224328 |
Jan 1969 |
SEX |
Continuations (1)
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Number |
Date |
Country |
Parent |
176839 |
Apr 1988 |
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