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"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 6298520 | Door closer and mounting bracket A door closer and mounting bracket for attaching the door closer to either the door or the door frame. The door closer includes two pins at one end for engaging corresponding holes on the mounting bracket and the mounting bracket includes a resilient clip... | 10/09/2001 |
| 6297725 | Remotely-operated self-contained electronic lock security system assembly A keyless locking mechanism is activated by a remote unit which transmits coded signals to an electromechanical door lock device. The electromechanical device components are configured for secure mounting within the void or hollow portions of existing doo... | 10/02/2001 |
| 6205615 | Door closer A door closer and mounting bracket for attaching the door closer to either the door or the door frame. The door closer includes a lip at one end for engaging a corresponding hook on the mounting bracket and a screw passageway at the other end for engaging... | 03/27/2001 |
| 6189351 | Door lock with clutching mechanism A door lock having a clutching mechanism for selectively engaging and disengaging the outer handle of the lock from a key spindle having latch scoops for operably engaging a latch slide. The key spindle contains a cam mechanism for moving a dogging arm fr... | 02/20/2001 |
| 6131966 | Latch holdback mechanism for a mortise lock A holdback dog for a mortise lock including a holdback dog slidably mounted to a tab on the mortise lock locking link. The holdback dog is activated by first retracting the latchbolt using the inside handle and then unlocking the lock using either the key... | 10/17/2000 |
| 6125505 | Door closer and mounting bracket A door closer and mounting bracket for attaching the door closer to either the door or the door frame. The door closer includes a lip at one end for engaging a corresponding hook on the mounting bracket and a screw passageway at the other end for engaging... | 10/03/2000 |
| 6107934 | Remotely operated self-contained electronic lock security system assembly A locking mechanism for use in a door and the like. A remote handheld controller transmits coded signals to an electronic door lock. A sensor/receiver receives the signals and provides the signal to a processor which compares the coded signals against a p... | 08/22/2000 |
| 6047440 | Non-rotating pinion cap A non-rotatable pinion cap for use on a non-handed door closer where both ends of the drive pinion extend beyond the cylinder body. The pinion cap has one exposed edge for engaging the door or door frame surface and includes a christmas tree plug for atta... | 04/11/2000 |
| 6042417 | Power feed adapter A power feed adapter comprising: a battery holder; an adapter cap for attachment to the battery holder, the adapter cap having an electrical contact thereon, the electrical contact comprising: a central contact connected to a positive terminal of the batt... | 03/28/2000 |
| 6038896 | Lockset with motorized system for locking and unlocking A door lock (1), preferably operable both by a mechanical key (C) with a key cylinder (60) and by an electronic signal and having inside and outside handles (A, B) mounted on inside and outside hollow spindles (10, 50), for mounting on a door having an in... | 03/21/2000 |
| 5947537 | Spring biased handle catch A knob catch for securing a knob or lever to the driving spindle of a door lock. The knob catch is constructed of a base with a centered odd shaped hole. The hole is made in such a way that the knob or lever cannot be removed when the locking device is in... | 09/07/1999 |
| 5933086 | Remotely-operated self-contained electronic lock security system assembly A keyless locking mechanism for use in a door or the like. An operator activates the system by means of a portable remote handheld controller or a remote keypad unit, which transmit coded signals to an electronically controlled, electromechanical door loc... | 08/03/1999 |
| 5918916 | Automatic deadbolt with separate trigger An automatic door latch has a case and a bolt movable within the case between a fully extended position in which the bolt extends forwardly of the case and a partially extended position in which the bolt is positioned to contact a door strike. There is a ... | 07/06/1999 |
| 5881590 | Axial door bolt retainer The several unassembled parts of a door lock assembly, nested axially within one another, are secured by axial retainer means which engage an aperture in the door lock assembly that is not used to secure inner and outer door lock assemblies to one another... | 03/16/1999 |
| 5864986 | Checking device for roller supported doors A check mechanism is provided to regulate door speed of a roller supported sliding door as the door is manually opened or closed. The mechanism is attached to a door hanger and uses a rocker arm, which slides along a control track. The control track has e... | 02/02/1999 |
| 5866999 | Position switch setting mechanism A set/operate mode switch is interposed between the door sensing or element door position activated switch and a remote monitoring station, to enable the remote station to monitor the door condition, or to enable a local signal assembly to monitor the doo... | 02/02/1999 |
| 5864920 | Door closer for the non-fire side of a fire-door safety installation A door control device for use on a non-fire side of a fire-door mounted in a door frame in a fire-door safety installation has a door closer assembly filled with a hydraulic damping fluid and attached to a non-fire side of the fire-door by at least one fa... | 02/02/1999 |
| 5857290 | Checking device for roller supported doors A check mechanism is provided to regulate door speed of a roller supported sliding door as the door is manually opened or closed. The check mechanism includes an idler arm assembly attached to a door hanger with an idler roller attached to the idler arm a... | 01/12/1999 |
| 5820290 | Door handle/knob assembly having a wobble control ring A door handle/knob assembly a door handle/knob assembly includes a housing having an opening formed within the housing, and a shaft received within the opening of the housing. The shaft has an outer surface, a rib for axially retaining the shaft to a lip ... | 10/13/1998 |
| 5816086 | Axial moving pushbutton for a lock having rotary locking and release motions A door lock device has an inside handle assembly and an outside handle assembly. A latch is positioned between the two handle assemblies and there is a spindle which is in rotatable engagement with both handle assemblies and in operable engagement with th... | 10/06/1998 |
| 5794991 | Interlocking dead bolt with projecting pins A lock assembly of a door preparation includes at least one spring latch member which is spring biased within a door jamb bore between an extended position and a retracted position in which the spring latch member, when the door is being opened, engages a... | 08/18/1998 |
| 5791178 | Electrical transmission path for electrical and electro-mechanical locks An apparatus for providing an electrical transmission path in a door lock to an electrical lock operating system from an electrical contact pin protruding axially from a pin tower of an insulated key cylinder having an electronic touch button for a front ... | 08/11/1998 |
| 5782118 | Lockset with motorized system for locking and unlocking A door lock, preferably operable both by a mechanical key with a key cylinder and by an electronic signal and having inside and outside handles mounted on inside and outside hollow spindles, for mounting on a door having an inside face and an outside face... | 07/21/1998 |
| 5769472 | Drive in housing halves for mounting a latch assembly in a door and a method of installing same A drive-in housing for mounting a latch assembly in a bore formed in a door comprises two identical housing parts each having a slot therein. When the housing parts are brought together they form an opening for receiving a bolt casing of the latch assembl... | 06/23/1998 |
| 5765412 | Multiple backset lock A multiple backset door lock assembly with a door lock assembly in which a bolt is coupled to a bolt extension saddle. The bolt extension saddle is provided with two contoured slots, each slot being engagable by a crank and pin assembly actuated either by... | 06/16/1998 |
| 5727824 | Isolative coupling for a thumb-lever unit of a door lockset A door lockset, mounted on a door having an inside and outside face, has a latch bolt operated by a lever handle from the inside and by a grip handle thumb lever from the outside, the latch bolt being biased to an extended position except when retracted b... | 03/17/1998 |
| 5722276 | Method for attaching faceplate mounting tabs to a mortise lock housing and tabs and housings adapted for that method A method is provided for attaching separable mounting tabs to a mortise lock housing, including the steps of providing a hollow mortise lock housing in the form of a rectangular parallelepiped with a first side adapted to lie in a door edge and to provide... | 03/03/1998 |
| 5718468 | Door handle modular return spring cage assembly A modular return spring cage assembly for door lock handles, consists of a door lock mounting chassis member having two opposed faces, at least one face having two opposed arcuate channels forming a circular groove in the face. The groove has two split di... | 02/17/1998 |
| 5709009 | Door closer for the non-fire side of a fire-door safety installation A door control device for use on a non-fire side of a fire-door mounted in a door frame in a fire-door safety installation has a door closer assembly filled with a hydraulic damping fluid and attached to a non-fire side of the fire-door by at least one fa... | 01/20/1998 |
| 5697653 | Bolt and bar assembly A method for automatically attaching a bolt for a mortise lock to its draw bar includes the steps of boring a hole longitudinally in the bolt on the axis of the bolt; drilling a hole, having a small diameter relative to that of the bored hole, transversel... | 12/16/1997 |
| 5695227 | Lock platform A lock platform for a door includes a face plate lying in a vertical plane parallel to the plane of the door and an outer peripheral edge margin which extends from the outer periphery of the face plate generally perpendicularly away from the face plate an... | 12/09/1997 |
| 5690371 | Fused spring latch A first platform having fingers rising therefrom is interengaged with a second, fusible platform in a spring latch assembly. The second holds the first at an angle in which the fingers avoid notches formed in the tail of the latch bolt. When the fusible p... | 11/25/1997 |
| 5689985 | Electronic touch key providing a tactile pressure signal for an electronic lock An electronic touch key for operating an electronic lock in an electronic lockset, includes a handle having front and rear surfaces; an electronic touch button mounted to the front surface of the handle; and a device, mounted to the rear surface of the ha... | 11/25/1997 |
| 5683127 | Deadbolt latch assembly A deadbolt latch assembly having an interlocking front faceplate and a collar which capture a locking tab of the deadbolt housing permitting the rapid field assembly of a selected front face or trim plate by simply engaging intermeshing fingers by rotatio... | 11/04/1997 |
| 5676407 | Dead bolt actuating assembly A dead bolt actuating assembly capable of moving a dead bolt between a retracted position and an extended position includes a latch arm having an end portion mounted on a rotating shaft. The latch arm is movable in response to the rotational movement of t... | 10/14/1997 |
| 5657653 | Dual lock with simultaneous retraction of latch and deadbolt by inside lever and uncoulpler between driving spindle and the lever In a door lock having a latch bolt selectively retractable by a rotatable driver spindle, the driver spindle being rotatable by operation of an outside manual lever associated with an outside chassis assembly or by operation of an inside manual lever asso... | 08/19/1997 |
| 5628216 | Locking device A locking device is disclosed, comprising a locking mechanism having a locked position and an unlocked position, a hollow plunger member having a central axis, the hollow plunger member being engaged with the locking mechanism to move the locking mechanis... | 05/13/1997 |
| 5604970 | Bolt and bar attachment method for auto assembly A method for automatically attaching a bolt for a mortise lock to its draw bar includes the steps of boring a hole longitudinally in the bolt on the axis of the bolt; drilling a hole, having a small diameter relative to that of the bored hole, transversel... | 02/25/1997 |
| 5598726 | Privacy lockset for a door A lockset suitable for use on doors of different thicknesses comprises inside and outside knobs mounted on inside and outside spindles which are in turn rotatably supported in inside and outside chassis. Rotation of either knob causes rotation of a rectan... | 02/04/1997 |
| 5593193 | Thumb actuated latch retracting mechanism for grip handle locks including integral installation gripping aid A thumb actuated latch retracting mechanism, for mounting with a grip handle on a door, includes a thumbpiece, the thumbpiece having a laterally offset cam on a second end thereof; an escutcheon plate having an opening through which the second end of the ... | 01/14/1997 |
