Patent ID: 8562692

Claim:
A lock system for connecting a roll-on liner on a residual limb to a hard socket, the lock system comprising: a roll-on liner comprising a pin having multiple radial protrusions and recesses between said protrusions; and a lock comprising: a housing having a first bore for receiving the pin and a second bore transverse and open to said first bore, the pin being slidable in said first bore; a shaft slidable in said second bore, having a first end extending into the housing and a second end extending out of the housing, and a longitudinal axis between said first end and said second end; a blade unit provided in said second bore and having a first blade end and a second blade end, wherein said blade first end extends into the first bore, and the second blade end is slidably connected to said shaft so that said blade unit slides relative to the shaft in a direction parallel to said longitudinal axis; a blade spring provided between the shaft and the blade unit, so that said blade unit is urged away from the shaft toward the first bore to engage at least one of said plurality of radial recesses of said pin; a shaft spring adapted to urge the shaft into an inward lock-closed position, toward the first bore of the housing, wherein a seal provided on said first end of the shaft seals against a sealing surface of the housing when the shaft is in said lock-closed position; a handle connected to the second end of the shaft and accessible at an outer surface of the housing, wherein said handle is adapted to pull the shaft outwards against the bias of the shaft spring into a lock-open position wherein the seal is moved away from the sealing surface to allow air to flow through the lock; and wherein said slidable connection of the blade unit to the shaft is adapted so that the blade slides outward relative to the shaft when outward force is applied to the blade unit by the pin moving downward in the first bore, and the shaft and seal remain in lock-closed position to prevent air flow through the lock.