Door lock having reinforced strength
OwnerZhen-Lin Yang, Sheng-Jan Yang +1inventors
InventorsZhen-Lin Yang, Sheng-Jan Yang, Mu-Gui Yang
Life of this patent
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Abstract
A door lock includes a support seat having a recess for mounting a driven member, a control knob including a drive member rotatably mounted in the support seat to rotate the driven member and a rotation member to rotate the drive member and having an outer wall formed with an annular groove and a locking groove, and a locking pin mounted in the support seat and having a locking end selectively extended into the annular groove or the locking groove of the rotation member of the control knob. Thus, the door lock has a dead locking function to lock the door from inside to prevent the door from being unlocked from outside by a key or other tool so as to protect the user's safety inside of the door.
Claims20
A door lock, comprising:
- a support seat having a mediate portion formed with a recess;
- a driven member rotatably mounted in the recess of the support seat;
- a control knob mounted on a first portion of the support seat and including a first drive member rotatably mounted in the first portion of the support seat and secured to a first portion of the driven member to rotate the driven member, and a rotation member mounted on the first drive member to rotate the first drive member and having an outer wall formed with an annular groove and an axially extending locking groove connected to the annular groove;
- a locking pin mounted in the first portion of the support seat and having a locking end selectively extended into the annular groove or the locking groove of the rotation member of the control knob.
Dependencies are inferred from the claim text.