Sliding latch
The invention is a sliding latch with a bolt sliding in and out of a primary housing from a closed condition to an open condition on a sled that also slides in the housing. A spring biases the bolt to extend out of the housing to the closed condition. The bolt can be moved to an open condition by an electric motor mounted on the sled that rotates a threaded member to move a nut in a cavity in the bolt that pulls the bolt against the spring bias. The bolt can also be moved to an open condition by a force directly on the bolt against the spring bias. The bolt can also be moved to an open condition by a force pulling on the sled to move the sled and nut so the nut pulls the bolt against the spring bias to an open condition.
1. A sliding latch having a closed condition and an open condition comprising,
a primary housing having a longitudinal axis and a substantially open front end and a back end with a wall having an inner side facing the front end and an opening,
an elongated sled having a longitudinal axis parallel to the housing longitudinal axis and a lip at a first end proximate the housing front end and a rear extension extending through the housing back end wall opening, the sled adapted to slide in the housing along the housing longitudinal axis,
an electric motor having a rotational axis parallel to the sled longitudinal axis and mounted on the sled and adapted to rotate a threaded member having an axis parallel with the motor rotational axis and extending through the opening in the back wall of the housing,
a retractable bolt adapted to slide along the primary housing longitudinal axis and extending outwardly from the housing front end in the closed condition, the bolt having a front wall and a back wall and an internal cavity, with the back wall having an inner side facing the cavity and an outer side opposite the cavity and an opening therein with the threaded member extending through the opening into the cavity,
an internally threaded nut non-rotatingly captured in the bolt cavity having a first side and a second side, with the nut threadedly engaging the threaded member,
a biasing member biasing the bolt to a closed condition having a first end contacting the outer side of the back wall of the bolt and a second end contacting the inner side of the back wall of the primary housing,
wherein in the closed condition, the bolt extends outwardly from the housing front end and the nut first side is adjacent the lip and the nut second side is adjacent the bolt back wall, and
wherein in a first open condition the bolt is retracted into the housing by an external force on the bolt along the housing longitudinal axis against the biasing member while the nut first side remains adjacent the lip, and
wherein in a second open condition, the bolt is retracted into the housing by an external force pulling the sled along the housing longitudinal axis against the biasing member and the sled lip moving the nut and causing the nut second side to contact the inner side of the back wall of the bolt, and
wherein in a third open condition, the bolt is retracted into the housing against the biasing member by the motor rotating the threaded member in a first direction thus moving the nut and the nut second side contacting the bolt cavity back wall.
2. The latch of claim 1 wherein the sled also comprises a stop to refrain the sled lip from extending from out of the housing front end.
3. The latch of claim 2 also comprising a housing around the motor with a front wall having an opening through which the threaded member extends.
4. The latch of claim 3 wherein the motor is mounted on the sled by being captured between the motor housing and the sled.
5. The latch of claim 4 wherein the stop for the sled comprises the contact of the front wall of the motor housing with the rear wall of the primary housing.
6. The latch of claim 1 wherein the threaded member is a screw with a threaded shaft and a drive head and the biasing member is a spring surrounding the shaft of the threaded member.
7. The latch of claim 1 wherein the motor has a motor drive shaft, the threaded member has a drive head, and the latch includes a clutch between the motor drive shaft and the threaded member drive head.
8. The latch of claim 7 wherein the clutch comprises a pair of discs with one disc drivingly mounted on the motor drive shaft and the other disc drivingly mounted on the threaded member and a clutch biasing means for biasing the discs against each other.
9. The latch of claim 1 wherein the primary housing also comprises a base plate adapted to be mounted on a substrate and the bolt has an inclined front face with the incline coming to a point adjacent the substrate.
10. The latch of claim 9 wherein the latch is changed from the closed condition to the first open condition by a striker moving normal to the longitudinal axis and the inclined front face forcing bolt into the housing and the latch into the first open condition.
11. The latch of claim 10 wherein after the striker passes by the bolt, the biasing member forces the bolt into the closed condition capturing the striker on the backside of the bolt.