초록 ▼

A lock for a door (10) comprises a casing (11), a bolt (55) operable to extend from or retract into the casing, a pivoted operating handle (36) operable at one side of the door to retract the bolt, lock means (28) for key operation at the other side of the door, and blocking means (81) to prevent op

A lock for a door (10) comprises a casing (11), a bolt (55) operable to extend from or retract into the casing, a pivoted operating handle (36) operable at one side of the door to retract the bolt, lock means (28) for key operation at the other side of the door, and blocking means (81) to prevent operation of the handle to retract the bolt. In a locked closed position of the door, the bolt (55) is extended, and with the blocking means operated, key operation of the exterior lock means (28) both retracts the bolt and also de-actuates the blocking means. At the inside of the door further key operable lock means (39, 40) are provided sokly to operate and, if required to the de-actuate the blocking means. A casting (38) secured in the casing mounts the further lock means (39, 40), provides pan-bearings (38b: 138b) for pivot rods (41, 43) of the handle (36) and a bolt locking element (44), provides a guide slot (138d) for a spring-likle connector (49) linking the handle to the bolt locking element, and provides a pair of arms (66) between which slides a bolt release member (69) and against which bears one end of a biasing spring around part of the bolt release member.

대표청구항 ▼

1. A lock for a wing movable between respective open and closed positions relative to a frame comprising a casing a bolt operable to extend from or to retract into said casing, an operating member arranged to be operable at one side of the wing, in use, to effect retraction of the bolt, first lock m

1. A lock for a wing movable between respective open and closed positions relative to a frame comprising a casing a bolt operable to extend from or to retract into said casing, an operating member arranged to be operable at one side of the wing, in use, to effect retraction of the bolt, first lock means arranged, in use, for operation at the other side of the wing, and blocking means operable from said one side of the wing, in use, to prevent operation of the operating member to retract the bolt, the arrangement being such that, in use, in a locked, closed position of the wing said bolt is extended and said blocking means, if operated, prevents retraction of the bolt by said operating member, operation of said first lock means both de-actuating said blocking means, if operated, and retracting the bolt, wherein the blocking means can be actuated from said one side only of the wing to prevent operation of the operating member to retract the bolt, wherein the blocking means are operable to prevent operation of the operating member to retract the bolt by second lock means at said one side of the wing; wherein said second lock means are operable at said one side of the wing to de-actuate the blocking means, and wherein the blocking means is an angularly moveable cam.2. A lock as claimed in claim 1, wherein the operating member is a pivotable handle.3. A lock as claimed in claim 2, wherein the pivotable handle has a projecting surface which engages said cam when the blocking means are operated and an attempt is made to pivot the handle.4. A lock as claimed in claim 1, wherein the cam is on a second member arranged for limited angular movement by operation of said operable second lock means at said one side of the wing.5. A lock for a wing movable between respective open and closed positions relative to a frame comprising a casing, a bolt operable to extend from or to retract into said casing, an operating member arranged to be operable at one side of the wing, in use, to effect retraction of the bolt, first lock means arranged, in use, for operation at the other side of the wing, and blocking means operable from said one side of the wing, in use, to prevent operation of the operating member to retract the bolt, the arrangement being such that, in use, in a locked, closed position of the wing said bolt is extended and said blocking means, if operated, prevents retraction of the bolt by said operating member, operation of said first lock means both de-actuating said blocking means, if operated, and retracting the bolt wherein the blocking means can be actuated from said one side only of the wing to prevent operation of the operating member to retract the bolt, wherein the blocking means is operable to prevent operation of the operating member to retract the bolt by second lock means at said one side of the wing, wherein said second lock means is operable at said one side of the wing to de-actuate the blocking means, wherein the blocking means is an angularly moveable cam, wherein the cam is on a second member arranged for limited angular movement by operation of said operable second lock means at said one side of the wing, wherein said second member has first and second ends, and wherein an angularly movable plug of said second lock means has a part received in a recess at the first end of said second member with lost motion between said plug and said second member.6. A lock as claimed in claim 5, wherein the key of said second lock means can be inserted into or withdrawn from said plug only when said plug is in a first position, angular movement of said plug in one direction from said first position to a second position operating said cam to block said operation of said operating member, with said plug then being angularly movable to said first position to take up said lost motion, and thereafter angular movement of said plug in the opposite direction from said first position to a third position deactivating said cam to remove said blocking, with the plug then being angularly movable to said first position to take up said lost motion.7. A lock as claimed in claim wherein the cam is restrained against inadvertent angular movement in both its blocking and de-actuated states.8. A lock as claimed in claim 5, wherein at the second end of said second member, said second member defines a surface for engagement by a locking bar of said first lock means.9. A lock as claimed in claim 8, wherein in a key insertion and withdrawal position of the locking bar, with said blocking means operated, the bar is spaced angularly from said surface defined at said second end of the second member, operation of an inserted key in one direction causing the bar to take up lost motion relative to said second member and to engage said surface thereby to move the second member angularly to de-actuate the blocking of the cam on the operating member, the bar thereafter being moved angularly by operation of the key in the opposite direction again to take up lost motion relative to said second member, to return the bar to its key insertion and withdrawal position.10. A lock as claimed in claim 9, wherein the locking bar engagement surface is a composite surface defined by two side surfaces respectively of a pair of diametrically opposed V-shaped projections within a bore at said second end of the second member.11. A lock as claimed in claim 9, wherein the second member mounts an angularly movable bolt drive cam and the lost motion taken up by the bar relative to the second member prior to de-activation of the blocking means corresponds to movement from a rest position of the bolt drive cam in releasing means deadlocking the bolt in its extended position and engaging the bolt, so as to retract it as the blocking means are de-actuated.12. A lock as claimed in claimed 11, wherein the lost motion take up by the bar after de-activation of the blocking means corresponds to movement of the bolt drive cam back to its rest position from a position to where it retracts the bolt for engagement by bolt holding means.13. A lock for a wing movable between respective open and closed positions relative to a frame comprising a casing, a bolt operable to extend from or to retract into said casing, an operating member arranged to be operable at one side of the wing, in use, to effect retraction of the bolt, first lock means arranged, in use, for operation at the other side of the wing, and blocking means operable, in use, to prevent operation of the operating member to retract the bolt, the arrangement being such that, in use, in a locked, closed position of the wing said bolt is extended and said blocking means, if operated, prevents retraction of the bolt by said operating member, operation of said lock means de-actuating said blocking means, if operated,wherein the blocking means are operable from said one side only of the wing to prevent operation of the operating member to retract the bolt, wherein the blocking means are operable to prevent operation of the operating member to retract the bolt by second lock means at said one side of the wing, wherein said second lock means are operable at said one side of the wing to de-actuate the blocking means, wherein the blocking means is an angularly movable cam, wherein the cam is on a member arranged for limited angular movement by operation of said second lock means at said one side of the wing, wherein an angularly movable plug of said second lock means has a part received in a recess at one end of said member with lost motion between said plug and said member, wherein the key of said second lock means can be inserted into or withdrawn from said plug only when said plug is in a first position, angular movement of said plug in one direction from said first position to a second position operating said cam to block said operation of said operating member, with said plug then being angularly movable to said first position to take up said lost motion, and thereafter angular movement of said plug in the opposite direction from said first position to a third position de-activating said cam to remove said blocking, with the plug then being angularly movable to said first position to take up said lost motion. 14. A lock as claimed in claim 13, wherein the cam is restrained against inadvertent angular movement in both its blocking and de-actuated states.15. A lock as claimed in claims 13, wherein said member, at its other end, defines a surface for engagement by a locking bar of said first lock means for operation at the other side of the wing.16. A lock as claimed in claim 15, wherein in a key insertion and withdrawal position of the locking bar, with said blocking means operated, the bar is spaced angularly from said surface defined at said other end of the member, operation of an inserted key in one direction causing the bar to take up lost motion relative to said member and to engage said surface thereby to move the member angularly to de-actuate the blocking of the cam on the operating member, the bar thereafter being moved angularly by operation of the key in the opposite direction again to take up lost motion relative to said member, to return the bar to its key insertion and withdrawal position.17. A lock as claimed in claim 16, where in the locking bar engagement surface is a composite surface defined by two side surfaces respectively of a pair of diametrically opposed V-shaped projections within a bore at said other end of the member.18. A lock as claimed in claim 16, wherein the member mounts an angularly movable bolt drive cam and the lost motion taken up by the bar relative to the member prior to de-activation of the blocking means corresponds to movement from a rest position of the bolt drive cam in releasing means deadlocking the bolt in its extended position and engaging the bolt, so as to retract it as the blocking means are de-actuated.19. A lock as claimed in claim 18, wherein the lost motion taken up by the bar after de-activation of the blocking means corresponds to movement of the bolt drive cam back to its rest position from a position to where it retracts the bolt for engagement by bolt holding means.20. A lock for a wing movable between respective open and closed positions relative to a frame comprising a casing, a bolt operable to extend from or to retract into said casing, an operating member arranged to be operable at one side of the wing, in use, to effect retraction of the bolt, first lock means arranged, in use, for operation at the other side of the wing, and blocking means operable, in use, to prevent operation of the operating member to retract the bolt, the arrangement being such that, in use, in a locked, closed position of the wing said bolt is extended and said block means, if operated, prevents retraction of the bolt by said operating member, operation of said first lock means both de-actuating said blocking means, if operated, and retracting the bolt, wherein the blocking means are operable from both sides of the wing to prevent operation of the operating ember to retract the bolt.