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

Claim 8:
9. 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,
the bolt module further comprising a bolt restraint and trigger, the bolt restraint configured to operate on the bolt and engage with the bolt when the bolt is moved to the retracted position so as to restrain the bolt in that position, and the trigger extending from the bolt module and arranged such that on striking of the trigger the trigger pushes against the bolt restraint releasing the bolt, wherein the bolt restraint comprises a plurality of restraint fingers configured to operate on the bolt and engage with the bolt, each of the fingers configured to come into engagement with the bolt at different partial retraction positions of the bolt to restrain the bolt in that position.