Latches assemblies and systems are disclosed. One latch includes a latch and a receiver. The latch has a housing and a pin extending from the housing. The pin is mounted for longitudinal movement along a pin axis. The latch further includes a motor coupled to move the pin longitudinally. The receiver defines an aperture extending along a receiver axis and positioned to receive the pin of the latch. The receiver has a retainer biased toward the receiver axis. The latch assembly has an open position in which the pin is extended distally along the pin axis and received in the aperture, and a latched position in which the pin is retracted proximally along the pin axis while the retainer is engaged with the pin. One latch system includes a plurality of latch assemblies configured to move to the latched position after all latch assemblies are in the open position.

Latches assemblies and systems are disclosed. One latch includes a latch and a receiver. The latch has a housing and a pin extending from the housing. The pin is mounted for longitudinal movement along a pin axis. The latch further includes a motor coupled to move the pin longitudinally. The receiver defines an aperture extending along a receiver axis and positioned to receive the pin of the latch. The receiver has a retainer biased toward the receiver axis. The latch assembly has an open position in which the pin is extended distally along the pin axis and received in the aperture, and a latched position in which the pin is retracted proximally along the pin axis while the retainer is engaged with the pin. One latch system includes a plurality of latch assemblies configured to move to the latched position after all latch assemblies are in the open position.

A locking system includes a tamper-resistant lock and key. The tamper-resistant lock includes a cylindrical lock body with external threading on at least a portion thereof and a bore extending into an end of the cylindrical lock body. The bore includes an engagement feature disposed on the wall that defines the bore, and the engagement feature is disposed a particular distance away from the bore opening. The key includes a collar that has a cylindrical key body that fits within the bore of the cylindrical lock body. The cylindrical key body also includes an opening defined by the collar sidewall, a retractable engagement member at least partially disposed within the opening, a spring disposed within the collar, and a plunger disposed within the collar that is operable to engage the spring and has a recess sized and shaped to accommodate the retractable engagement member.

An operating device for operating at least one door of an aircraft comprises a chassis that is fixed and secured to a fuselage of the aircraft, a control handle that is rotationally and translationally movable with respect to the chassis, a mechanism for converting a rotational movement of the control handle into an opening movement of the door. The translational movement allows the control handle to be in an in position in which it is aligned with the exterior surface of the fuselage and an out position in which it projects beyond the exterior surface of the fuselage. The control handle includes a cylindrical body and a head connected to one end of the body. The head of the control handle includes a fixed part rigidly connected to the body of the control handle and extending perpendicular thereto, and a movable part rotatably connected to the body and having a folded-down position against the fixed part and a deployed position in which the control handle has a T shape.

An operating device for operating at least one door of an aircraft comprises a chassis that is fixed and secured to a fuselage of the aircraft, a control handle that is rotationally and translationally movable with respect to the chassis, a mechanism for converting a rotational movement of the control handle into an opening movement of the door. The translational movement allows the control handle to be in an in position in which it is aligned with the exterior surface of the fuselage and an out position in which it projects beyond the exterior surface of the fuselage. The control handle includes a cylindrical body and a head connected to one end of the body. The head of the control handle includes a fixed part rigidly connected to the body of the control handle and extending perpendicular thereto, and a movable part rotatably connected to the body and having a folded-down position against the fixed part and a deployed position in which the control handle has a T shape.

A push-up device includes a case, a rod juts out from inside the case so as to adopt an advanced position, a rod biasing member biases the rod in a jutting out direction pushing the rod out from inside the case, a lock mechanism that includes a slide cam that moves together with the rod in the jutting out direction and a rotation cam that is relatively rotatable with respect to the slide cam about the axis of the rod, with the lock mechanism positioned between the case and the rod, and locking the rod in a retracted position in the case by the rotation cam engaging with the slide cam and rotating due to the rod being pressed in against biasing force of the rod biasing member, and a rotation cam biasing member that biases the rotation cam toward the jutting out direction.

A push-up device includes a case, a rod juts out from inside the case so as to adopt an advanced position, a rod biasing member biases the rod in a jutting out direction pushing the rod out from inside the case, a lock mechanism that includes a slide cam that moves together with the rod in the jutting out direction and a rotation cam that is relatively rotatable with respect to the slide cam about the axis of the rod, with the lock mechanism positioned between the case and the rod, and locking the rod in a retracted position in the case by the rotation cam engaging with the slide cam and rotating due to the rod being pressed in against biasing force of the rod biasing member, and a rotation cam biasing member that biases the rotation cam toward the jutting out direction.

A safety gate has a gate body and at least one locking device. The at least one locking device is mounted on the gate body, and each has a fixing member, a sliding member, and a positioning member. The fixing member is tubular and has a closed end, at least one sliding protrusion, and a recess. The at least one sliding protrusion is formed on the closed end. The sliding member is mounted rotatably around the fixing member and has at least one guiding track and a holding hole. The at least one curved guiding track is formed on and protruding from an inner surface of the sliding member. Each guiding track has an inclined guiding surface to define a high end and a low end respectively at two ends of the guiding track.

A safety gate has a gate body and at least one locking device. The at least one locking device is mounted on the gate body, and each has a fixing member, a sliding member, and a positioning member. The fixing member is tubular and has a closed end, at least one sliding protrusion, and a recess. The at least one sliding protrusion is formed on the closed end. The sliding member is mounted rotatably around the fixing member and has at least one guiding track and a holding hole. The at least one curved guiding track is formed on and protruding from an inner surface of the sliding member. Each guiding track has an inclined guiding surface to define a high end and a low end respectively at two ends of the guiding track.

A lockable manhole cover includes, for example, a manhole cover installable in an opening in a manhole frame, a locking member attached via a pin and slot arrangement beneath the manhole cover, and a lever pivotally attached to the manhole cover. A lower end portion of the lever is operably engageable with the locking member to move the locking member relative to the manhole cover. The lever is disposable in a lowered position so that an end portion of the locking member is operably engageable with a portion of the manhole frame for use in inhibiting removal of the lockable manhole cover from the manhole frame. The lever is disposable in a raised position so that the end portion of the locking member is operably disengageable with the portion of the manhole frame to allow removal or installation of the lockable manhole cover from or in the manhole frame.