Abstract: Methods and apparatus for releasably locking or blocking a door combine a first element with that door for blocking the door in an extended position of that first element and for alternatively releasing the door upon movement of the first element from such extended position. The first element is releasably blocked in its extended position by removably locating a second element in a path of movement of the first element. The door may be locked by locking the first element in its extended position and blocking such locked first element with the second element. The locked first element is released by selectively removing the second element from the path of movement of the first element, and the door is released by moving the released locked first element in its path of movement while the second element is removed from such path of movement. The first element may selectively be unlocked while it is blocked by the second element, and such blocked unlocked first element may be removed for a release of the door.

Abstract: A locking device for preventing the unauthorized removal of an outboard motor from a boat, where the outboard motor is clamped to the boat by a C-clamp, which is bolted to the stern of the boat. The locking device includes a casing which has holes aligned with the holes in the clamp to accommodate the bolts which can pass through the casing prior to their entry into the clamp thereby holding the casing in abutting relationship with the clamp while the boltheads are contained internally of the casing. A cover for the casing is pivotally connected to the casing at one end thereof, and contains a locking member at the other end therefor for securing the cover to the casing.

Abstract: A lever arm lock for a conventional quick-release hub assembly includes a cover mountable to a first skewer rod end nut supporting a quick-release lever arm. The cover is secured to the end nut with a locking mechanism (combination, magnetic, key, etc.) and maintains the lever arm in a locked position making it impossible to remove the hub. A second skewer rod end nut opposite the first end nut is formed with a substantially smooth outer surface that is continuously inclined with respect to the axle. This surface configuration prevents removal of the locked hub assembly by turning the second end nut with a pliers or other tool. The lever arm lock also prevents the hub from being jarred loose on impact with curbs, rocks, etc. The end nut assemblies have extensions which abut the frame thereby preventing loosening thereof for unauthorized removal.