Patent ID: 11905734
Assignee: SURELOCK MCGILL LIMITED
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A bolt module comprising:
a bolt moveable between a thrown position and a retracted position;
an anti-thrust member moveable between a release position in which the bolt can be retracted and a plurality of blocking positions obstructing driving back of the bolt under action of an external force on the bolt, and
a first rotor assembly capable of accepting a drive element, the first rotor assembly arranged to drive the bolt and to move the anti-thrust member between the plurality of blocking positions and the release position,
wherein the anti-thrust member is biased, the bias configured to drive the anti-thrust member into a path of the rear of the bolt, the anti-thrust member comprising a plurality of stopping faces against which movement of the bolt is obstructed, each stopping face offset in the direction of movement of the bolt and offset in the direction of movement of the anti-thrust member to the subsequent stopping face so as to form a series of steps, and
the first rotor assembly arranged such that as the first rotor assembly retracts the bolt, the first rotor assembly retracts the anti-thrust member against the bias and moves a first stopping face transversely out of the path of the rear of the bolt to allow further retraction of the bolt and limit driving back of the bolt under action of an external force to a second stopping face stepped back from the first stopping face, the second stopping face in the path of the bolt.