Abstract: A latch mechanism, in which a female portion is provided with a slot having two opposed edges and inner and outer wall surfaces on opposite sides of the slot edges, and a male portion having a member with a forward end and a shoulder thereon for extending through the slot and seating on the inner surface of the female portion. A member movable toward and away from the forward end of the first member is adapted to seat in the slot when the first member is disposed therein, for holding the first member in the slot and the shoulder in engagement with the inner surface of the part defining the slot. The second member includes a lug for positively disengaging the male and female members as the second member is retracted against a spring which urges it toward the forward end of the first member. An operating element, preferably consisting of a lock, push button, handle, wire or stem, is provided for retracting the second member.

Abstract: A ramp door hinged along the forward edge of a cargo door opening in the fuselage of an aircraft is retained in a locked position until the abutting end of a cargo door is pivoted into the aircraft about a hinge along the aft edge of the opening. Cylindrical pins extend from brackets on the fuselage at spaced-apart locations along each side of the ramp door opening. The pins pass into eyelet openings in spaced-apart upstanding hanger members supported by the ramp door. The hinge for the ramp door includes crank arms coupled with a hydraulic actuator used to move the ramp door with a translating motion in an aft direction to disengage the hanger members from the support pins. This translating movement of the ramp door is required as an initial measure for lowering the ramp door but inhibited so long as the cargo door remains in a closed position.

Abstract: A theft-preventing container for an appliance such as a CB radio. A metal box receives the appliance therein, the box having one wall with an access opening to allow access to controls of the appliance within the box, and one of the box walls is movable to allow removal of the appliance from within the box. A latching structure is provided to latch the movable box wall to the rest of the box to prevent unauthorized movement of the movable box wall. The latching structure includes interfitting groups of tubular members having aligned bores formed on the movable wall and a stationary wall of the box, a removable hardened metal latching bolt for receipt by the tubular members, and a locking device, including a key release structure, for holding the latching bolt in place when it is received by the tubular members and prevents relative movement between the tubular members.

Abstract: A latch assembly for connecting adjacent parts together in angular relationship to one another, includes interengaged latch elements having aligned and elongated openings therein respectively sloping inwardly toward one another. A latch pin having an elongated cross-sectional width extends through the aligned openings to thereby effectively resist forces tending to pull the latch elements apart.

Abstract: A lock assembly employing cooperating hinge plates interlocked with a removable bolt to prevent the non-hinged edges of a locked panel or door from moving away from its panel or door jambs.

Abstract: A high security door lock having a crossbar mounted on a door and a keeper mounted on the door frame. A pin with at least one projection is provided to secure the crossbar to the keeper by inserting the pin through at least one slot in the keeper. A locking channel is provided integral with the keeper and located at an angle to the slot in the keeper. When the pin is inserted into the keeper and rotated, the pin projection seats in the locking channel. A biasing means is provided to coact with the pin to hold the projection in the locking channel and prevent uncoupling of the crossbar from the keeper absent depression and rotation of the pin.

Abstract: A locking device having a partial bearing surface formed by a shaft cradle. A restraining enclosure is formed by the shaft cradle and a slidably reciprocating detent having a recess therein, the detent being urged to form said restraining enclosure by a tension means.

Abstract: Improved heavy duty locking means are disclosed for locking together a pair of movable components such as the tilt cab and chassis components of a motor vehicle, characterized by the provision of movable locking pin means for releasably connecting the blade and housing members secured to adjacent surfaces of the components, respectively. In one embodiment, the locking pin is connected with the housing member for axial displacement between locked and released positions relative to a locking aperture contained in one end of the blade member. In another embodiment, the locking pin is connected for lateral displacement relative to a locking slot contained in a lateral surface of the blade member. The locking pin may be actuated by piston and cylinder motor means or by a manually-operable linearly-displaceable actuator. In various embodiments of the apparatus, the motor means and the locking pin are arranged on the same and on opposite sides of the blade and housing members, respectively.

Abstract: A security system for double doors which incorporates keeper blocks secured to the doors near their free edges in positions such that they overlap vertically when the doors are closed. The blocks have holes extending vertically therethrough which align when the doors are closed to form a passage for reception of a lock pin assembly having irremovable heads above and below the blocks. The lock pin can only be removed by destroying the pin or the keeper blocks or their supports. The blocks are secured to and shielded by vertically extending reinforcing ribs attached to the doors near their free edges. A pilot hole of a diameter exceeding that of the pin extends through one of the blocks perpendicular to the axis of the pin so that the pin can be cut by means of a drill, allowing the two severed sections of the pin to be moved out of the aligned holes to free the doors.