Structure for controlling the dead bolt in an electronic lock

Claim 1

A structure for controlling a dead bolt in an electro-magnetic lock comprising: a control case fixed at the outer side of a door for a coded card to insert in and provided with a shaft hole for a shaft of an outside knob to run through and to rotate therein, said outside knob rotating an inner tube having a square hole for an outside square shaft to fit therein so that the rotation of the outside knob can also rotate the outside square shaft; a bottom plate combined with an inner case fixed at the inside of the door, said bottom plate and inner case having respectively a corresponding shaft hole for a shaft of an inner knob to fit and rotate therein together, said inner knob combined with an inner tube in its inner hole to rotate together, said inner tube having two opposite slots at an outer end thereof for two opposite projections of a moving ring to engage with, said moving ring having a square shaft hole for an inner square shaft fixed in the moving plate of the dead bolt to fit in, said inner square moving plate of the dead bolt to fit in, said inner square shaft having an inner through hole for a moving rod to pass through to rotate therein idly, said moving rod being longer than the inner square shaft and having both ends extending out of the inner square shaft, one end of said moving rod being square and fitting in the outer square shaft for mutual movement therewith, another end of said moving rod being oval and fixed with a peripherally toothed turning disc confined by a limit plate so as to rotate the limit plate but not to move it lengthwise, said limit plate having a projection to stick in a hole in the inner tube; and an electro-magnetic coil contained inside the inner tube for producing magnetism to pull a central rod running through the electro-magnetic coil, one end of said central rod linked with a clutch, said clutch provided with a plurality of grooves for engaging with teeth of the turning disc, another end of said central rod being urged by a spring into contact with a disc, said disc provided with tapered grooves for tapered protrusions on a turning button to selectably contact with, said turning button set in the shaft hole of the inside knob and able to be rotated to move the disc so as to push the central rod to make the clutch engage with the turning disc.