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US 6,857,300 B1Granted
Door locking device
OwnerPeter Heeley, Philip David Jonesinventors
Life of this patent
Estimating the term…
Abstract
A locking device (1) is provided for a door latch in which a latch bar of the door latch mechanism is turnable to retract a latch bolt of the latch mechanism. A locking means is adapted to be actuated in response to turning of a door handle (3) for the latch mechanism in anti-clockwise direction so as to lock the latch bolt in its extended latching position. It is released by turning the handle in the clockwise direction.
Claims28
A locking device for a door a latch mechanism comprising a latch bolt, latch bar coupled to the latch bolt and rotatable to retract the latch bolt, and door handles connected to opposite ends of the latch bar for rotating the latch bar to cause retraction of the latch bolt, the locking device being operable in response to turning of one door handle to prohibit turning of the latch bar by the other door handle, the locking device comprising:
- rotatable first locking means comprising first coupling means for coupling to the latch bar;
- second locking means for engaging said rotatable first locking means and preventing turning thereof;
- and
- cam means for controlling operation of said second locking means, said cam means comprising second coupling means for coupling to the latch bar;
- said rotatable first locking means and said cam means being turnable relative to one another when coupled to the latch bar by the respective first and second coupling means thereof so that said second locking means is operable to engage said rotatable first locking means in response to turning of said cam means in one direction relative to said rotatable first locking means and so that whereafter said second locking means is operable to disengage from said rotatable first locking means upon turning said cam means in an opposite direction;
- said rotatable first locking means comprising a rotatable locking member and detent means on a periphery thereof, and said second locking means comprising a movable locking member operatively controlled by said cam means for engagement with said detent means.
3 more elements
A locking device for a door latch mechanism comprising a latch bolt, door handles, and a latch bar coupled to the latch bolt and having opposite ends coupled to the door handles so that rotation of the latch bar causes retraction of the latch bolt, the locking device being operable in response to turning of one door handle to prohibit turning of the latch bar by the other door handle, the locking device comprising:
- a housing for securing in a fixed position to a door;
- a rotatable locking member rotatably mounted in said housing, said rotatable locking member having an external periphery and a central aperture defining an internal periphery, said external periphery of said rotatable locking member comprising detent means;
- a slidable locking member engageable with said detent means and mounted in said housing for movement towards and away from said external periphery of said rotatable locking member;
- a spring urging said slidable locking member towards said external periphery of said rotatable locking member;
- cam means rotatably mounted in said housing means coaxially with said rotatable locking member, said cam means having an external periphery with a cam profile and a central aperture defining an internal periphery of said cam means;
- and
- cam follower means on said slidable locking member engaging said cam profile so that said cam means controls sliding movement of said slidable locking member, said cam profile permitting said slidable locking member to move inwardly to engage said detent means of said rotatable locking member to lock said rotatable locking member against rotation;
- the central apertures in said rotatable locking member and said cam means being adapted to fit onto an adjacent end of the latch bar, said internal periphery defined by one of said central apertures substantially corresponds in shape to the external periphery of the latch bar such that the associated one of said rotatable locking member and said cam means is rotatable with the latch bar, and said internal periphery of the other of said central apertures having a configuration which enables the other of said rotatable locking member and said cam means to turn relative to the latch bar through a limited arc of movement so that when said cam means is turned in one direction, said cam profile and cam follower means cooperate to permit said slidable locking member to engage said detent means of said rotatable locking member, and so that whereafter turning of said cam means in an opposite direction causes said cam profile and cam follower means to cooperate to disengage said slidable locking member from said detent means.
5 more elements
A door latch mechanism comprising:
- a slidable latch bolt for engaging a keeper on a door frame;
- latch bar means coupled to said latch bolt and turnable to retract said latch bolt by turning of door handles secured to opposite projecting ends of said latch bar means;
- and
- a locking device which is actuated by turning of one of the door handles in one direction to prohibit turning of said latch bar means and retraction of said latch bolt by turning of the other door handle so that whereafter said locking device is released by turning of the one handle in the opposite direction, said locking device comprising
- rotatable first locking means coupled to said latch bar means, and
- second locking means engageable with said first locking means,
- said rotatable first and second locking means being engageable in response to rotation of said latch bar means by turning the one door handle in the one direction so that whereafter said rotatable first and second locking means are disengageable in response to rotation of said latch bar means by turning the one door handle in the opposite direction;
- said rotatable first locking means comprising a rotatable locking member having a locking detent disposed in a periphery of said rotatable locking member, and said second locking means comprising a movable locking member operatively controlled by a cam means for engagement with said locking detent.
5 more elements
A door latch mechanism comprising:
- a slidable latch bolt for engaging a keeper on a door frame;
- latch bar means coupled to said latch bolt and turnable to retract said latch bolt by turning of door handles secured to opposite projecting ends of said latch bar means;
- and
- a locking device which is actuated by turning of one of the door handles in one direction to prohibit turning of said latch bar means and retraction of said latch bolt by turning of the other door handle so that whereafter said locking device is released by turning of the one handle in the opposite direction, said locking device comprising
- rotatable first locking means coupled to said latch bar means, and
- second locking means engageable with said first locking means,
- said rotatable first and second locking means being engageable in response to rotation of said latch bar means by turning the one door handle in the one direction so that whereafter said rotatable first and second locking means are disengageable in response to rotation of said latch bar by turning the one door handle in the opposite direction;
- said latch bar means comprising coaxial latch bars and each latch bar having said first locking means engageable with said second locking means to prohibit retraction of said latch bolt in response to turning of either of said latch bars relative to the other said latch bar in the one direction.
5 more elements
A door latch mechanism comprising:
- a slidable latch bolt for engaging a keeper on a door frame;
- latch bar means coupled to said latch bolt and turnable to retract said latch bolt by turning of door handles secured to opposite projecting ends of said latch bar means;
- and
- a locking device which is actuated by turning of one of said door handles of said latch mechanism in one direction to prohibit turning of said latch bar means and retraction of said latch bolt by turning of the other door handle so that whereafter said locking device is released by turning of the one handle in the opposite direction, said locking device comprising
- rotatable first locking means coupled to said latch bar means, and
- second locking means engageable with said first locking means,
- said rotatable first and second locking means being engageable in response to rotation of said latch bar means by turning the one door handle in the one direction so that whereafter said rotatable first and second locking means are disengageable in response to rotation of said latch bar means by turning the one door handle in the opposite direction;
- said rotatable first locking means comprising a rotatable locking member having a locking detent disposed on a periphery of said rotatable locking member, and said second locking means comprising means disposed on said slidable latch bolt for engaging with said locking detent.
5 more elements
Dependencies are inferred from the claim text.