Slidable door safety lock

Claim 2

A security lock for a slidable closure having a fixed spaced relationship with a second structure in its close position comprising: a pair of elongated members adapted to bridge the space between said slidable closure and said second structure with their inner ends in telescoping relationship, means to separately support the extended ends of said elongated members to said slidable closure and to said second structure whereby said closure and said second structure are movable in relation to each other in a predetermined telescoping distance, means to lock one of said elongated members at said support means in a first retracted position toward the other elongated member whereby said elongated members are retained in said telescoping relationship to allow limited opening between said closure and said structure, said locking means including a latch member so positioned as to be overlapped and immobilized by the inner end of the other of said elongated members in said retracted position and being releasable in the extended position of said one elongated member whereby said one elongated member is movable to an extended position away from the other elongated member to allow clearance disengagement of said telescoping relationship in the closed position of said slidable closure whereby said slidable closure is unlocked.

Claim 3

A security lock in accordance with claim 1 in which said support means and the extended end of said one elongated member are connected by slidably interengaging elements allowing axial movement of said one elongated member in relation to the other elongated member to and from said retracted and extended position, said latch member being pivotally mounted on said one elongated member at a point outside the terminus of said telescoping relationship of said elongated members in their extended axial positions, the distal end of said latch member being disposed toward said aforementioned support means, and an abutment of said support means adapted to engage the distal end of said latch member and retain said one elongated member in the retracted position.

Claim 4

A security lock in accordance with claim 2 in which: said slidably interengaging elements comprise pin and slot elements of such orientation and dimension as to afford relative movement between said retracted and extended positions.

Claim 5

A security lock in accordance with claim 3 in which: said support means and the extended end of said one elongated member engage one upon the other by means of opposing planar bearing surfaces and are connected by said slidably interengaging elements so that said one elongated member is movable to and from said retracted and extended positions and is adapted to be pivoted on said planar bearing surfaces out of telescoping engagement with said other elongated element in the extended position of said one elongated member and the release position of said latch member.

Claim 6

A security lock in accordance with claim 4 in which: said abutment on said support means is provided with a beveled surface facing said latch member, one of said slidably interengaging elements comprises a slot in said abutment having its longer axis aligned with the axis of said telescoping relationship of said elongated members, the other of said slidably interengaging elements comprises a pin depending from said extended end of said one elongated member and engaged in said slot against axial displacement, an elongated recess is provided in the side of the extended end of said one elongated member with a beveled wall at the end of said recess nearest said pin, said latch member is pivotally mounted at one end within said recess with its distal end supported upon said beveled wall, said other elongated member has a tubular inner end and the inner end of said one elongated member telescopes therein, the space between the inner end of said slot and said abutment being substantially the same as the space between said pin and the beveled wall of said recess, whereby with said one elongated member in the retracted position said latch member occupies said recess and said tubular elongated member telescopes thereover to allow limited opening of said slidable closure and also with the inner ends of said elongated members at the extended limit of their telescoping relationship, upon movement of said one elongated member to its extended position within said slot the distal end of said latch member automatically rides upwardly on said beveled surface of said abutment to allow the inner end thereof to clear its telescoping relationship with the tubular inner end of said other elongated member and unlock said slidable closure.

Claim 7

A security lock in accordance with claim 5 in which: the extended end of said one elongated member is provided with an offset wall adapted to engage the abutment of said support means in the extended position of said pin and slot.

Claim 8

A security lock in accordance with claim 5 in which: the length of the telescoping relationship of said elongated members in the retracTed position of said one elongated member is sufficiently greater than the length of said latch member to allow same to pivot to the unlocked position.

Claim 9

A security lock in accordance with claim 5 in which: the means to support said other elongated member comprises a combination hook-and-eye attachment at the extended end thereof, said hook and eye being disengageable only with the inner end of said elongated member moved away from said telescopic alignment.

Claim 10

A security lock for a sliding closure comprising first and second elongated members in telescoping relation overlapping a predetermined distance for supporting themselves in alignment, means for controlling said telescoping relation including slidably interengaged pin and slot elements in which said slot is of a length and orientation to afford relative movement of the pin element approximately said predetermined distance, bracket means for securing one of said elements to a support that is stationary with respect to said sliding closure and limiting movement of the other one of said elements to the length of the slot, said first elongated member carrying the other one of said elements for disassociation of said telescoping relationship by relative movement of said members in one direction, one of said elements carrying a shoulder, latch means movably mounted with respect to one of said elongated members to clear said shoulder when movement in said one direction is made, said latch means engaging said shoulder at other times to hold said members against said disassociation movement, locking means carried by one of said members engaging said latch means and securing it in its shoulder-engaging position while said members are moved relative to each other in a direction opposite to said one direction, stop means carried by one of said members for limiting the distance of further telescoping movement between them in said other direction, and means securing the second member to the sliding closure.

Claim 11

A security lock for a sliding closure comprising first and second elongated members in telescoping relation overlapping a predetermined distance for supporting themselves in alignment, means for controlling said telescoping relation including slidably interengaged pin and slot elements in which said slot is of a length and orientation to afford relative movement of the pin element approximately said predetermined distance, bracket means for securing one of said elements to a support that is stationary with respect to said sliding closure and limiting movement of the other one of said elements to the length of the slot, said first elongated member carrying the other one of said elements for disassociation of said telescoping relationship by relative movement of said members in one direction, one of said elements carrying a shoulder, latch means movably mounted with respect to one of said elongated members to clear said shoulder when movement in said one direction is made, said latch means engaging said shoulder at other times to hold said members against said disassociation movement, locking means carried by one of said members engaging said latch means and securing it in its shoulder-engaging position while said members are moved relative to each other in a direction opposite to said one direction, stop means carried by one of said members for limiting the distance of further telescoping movement between them in said other direction, and means securing the second member to the sliding closure.

Claim 12

The combination called for in claim 9 in which said securing means is releasable and comprises interlocking elements, one having an opening and the other having an angular member received through said opening and the inner portion of said angular member being disposed in interference engagement with said other interlocking element as oriented by telescopic movement of said second member, said angular member being moved from said interference engagement when said telescoping relationship is disassociated and said telescoping members are moved from axial alignment.

Claim 13

The combination called for in claim 9 in which said securing means comprises hook-and-eye elements and the terminal end of said hook is disposed at an angle to the axis of the telescoping relation.