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Pneumatic door lock

  • US 6,106,032 A
  • Filed: 09/15/1997
  • Issued: 08/22/2000
  • Est. Priority Date: 09/20/1995
  • Status: Expired due to Fees
First Claim
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1. A lock for a door and frame structure comprising a locking mechanism for attachment to said door or frame section and a counterpart for attachment to the opposing one of said door or frame section, whereby in the closed condition a pressure locked connection exists between the locking mechanism and the counterpart, the improvement comprising:

  • an airtight hollow body (4) is provided, manually compressible and thereby reducible in its internal volume, with which an excess pressure can be created manually,the locking mechanism (6-20) includes an actuator (30) for the conversion of an overpressure into a mechanical movement of parts (12,

         15) of the locking mechanism (6-20) and this actuator (30) is connected to the hollow body (4) by at least one primary connecting tube (5),by movement of parts (12,

         15) of the locking mechanism (6-20) the pressure locked connection between the locking mechanism (6-20) and the counterpart (21) is removed,the actuator (30) comprises a pressure cylinder (6), a pressure piston (7) which can move within it and a similarly movable piston rod (8) connected to it,the locking mechanism (6-20) includes a locking bolt (12) which slides linearly along its axis,the locking bolt (12) is in pressure locking contact with a movable part (8) of the actuator (30),the locking mechanism (6-20) includes a rotating bolt (15) which is assembled so that it can turn through a determined angular region,the rotating bolt (15) is in pressure locking contact with the counterpart (21) during the meeting of the locking mechanism and the counterpart,the rotating bolt (15) includes a locking notch (17) and a detent notch (18),wherein the counterpart (21) captures a part of the rotating bolt (15) extending out of the lock and turns it so that the detent notch (18) comes to rest adjacent to the locking bolt (12) during the separation of the locking mechanism and the counterpart,wherein the counterpart (21) again captures the extending part of the rotating bolt (15) and turns it so that the locking notch (17) comes to rest adjacent to the locking bolt (12) during the meeting of the locking mechanism and the counterpart,a first spring (20,29) is present, which is in pressure contact with the locking bolt (12),when the locking mechanism is engaged in the counterpart, the first spring (20,29) pushes the locking bolt (12) into the locking notch (17) and thereby fixes the rotating bolt in this position by pressure locking,when the locking mechanism is disengaged from the counterpart, the first spring (20,29) pushes the locking bolt (12) into the detent notch (18) and thus holds the rotating bolt (15) in a stable position but where the rotating bolt (15) can be forced out of the stable position,one end of the locking bolt (12) includes means (14) to reduce frictional resistance,the rotating bolt (15) includes means (19) for reducing fictional resistance at its end directed against the counterpart (21).

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