Patent ID: 7185518

Claim:
A safety lock with a switching unit for a computer, said safety lock is adapted for engaging in a rectangular lock hole provided on said computer for locking; said safety lock comprises: a housing; a lock set provided in said housing and being in an unlocking state or a locking state; a locking cable extended out of said housing; a lock head having an unlocking position to be extended into or drawn out from a lock hole of said computer, and having a locking position for locking said lock hole; and a switching unit which has a switching lever extending out of said housing; when said lock set is in an unlocked state, said switching lever is adapted to moving to a first or a second position, when said switching lever is in said first position, said lock head is always controlled to be in a locking position; and when said switching lever is in said second position, said lock head is always controlled to be in an unlocking position; when said lock set is in said locking state, said switching lever is fixed and unable to be moved, wherein said lock head has a T shaped rotating axle and a fixing seat, said fixing seat is provided in said housing and has a protruding seat protruding out of said housing; a rotating shank of said T shaped rotating axle is extended through said fixing seat from outside of said protruding seat, when a transverse head on a tailing end of said T shaped rotating axle is aligned with and parallel to said protruding seat, an unlocking position is formed, while a locking position is formed if said transverse head perpendicularly crosses over said protruding seat, wherein said lock set at least has a locking block on a tailing end of a lock axle; said lock axle is moved axially upwards when said lock set is in an unlocking position, and is fixed when said lock set is in a locking position, wherein one end of said switching lever extending into said housing is connected with a pusher block which has an axle hole for extending therethrough and engaging therewith of said rotating shank of said T shaped rotating axle; thereby when said switching lever is moved, said pusher block rotates said T shaped rotating axle to change the relative position of said transverse head on a front end of said T shaped rotating axle to that of said protruding seat, wherein said pusher block of said switching unit is provided thereon with a first and a second recess for engaging therein of said tailing end of said lock axle of said lock set, wherein one of the first and the second recess corresponds to the locked position and another of the first and the second recess corresponds to the unlocked position.