Abstract: A doorholder for retaining a door in an open position by magnetic interaction with an armature secured to the door has an electromagnetic flux generator which includes a core having a face confronting the armature and a coil of wire surrounding the core. A cup having an inside diameter somewhat greater than the coil outside diameter receives the coil, the core extending from the face to the cup bottom. A power control circuit including a resistor circuit controls electrical power supplied to the coil, the power control circuit being mounted on a circuit board situated between the coil rear surface and the cup bottom. The resistor circuit being situated in sufficiently close proximity to the cup bottom for transfer of heat from the resistor circuit to the cup.

Abstract: A door lever assembly for disengaging an unlocked latch of a lockable door latch assembly includes a lever handle rotatably connected to a trim housing supporting a stop plate. A cam is operably connected to the lever handle and positioned to rotate in response to rotation of the lever handle, converting its rotational movement to linear movement of a movable slider positioned adjacent to the cam. A lift arm is operably connected to vertical rods of the door latch assembly and an over-ride spring is connected between the slider and the lift arm. The over-ride spring transmits motion of the slider to the lift arm to lift the lift arm and the connected vertical rods when the door latch assembly is in an unlocked position. The over-ride spring compresses in response to slider movement when the blocking slide is positioned to block movement of the lift arm when the door latch assembly is in its locked position, preventing damage to components of the door lever assembly.

Abstract: A door lever assembly having a locked and an unlocked position includes a trim housing and a lever handle and cam rotatably connected to the trim housing. A rotatable shaft extends between the lever handle and the cam, with the shaft defining a connection groove therethrough to provide access to a shaft interior. The shaft interior is configured to a accept a pin for connecting the cam and the shaft. This pin can be resettably disconnected following controlled slippage of frictional contact surfaces in response to excessive force applied to rotate the cam.

Abstract: A door lever assembly includes a lever handle rotatably connected to a trim housing. A pair of guide rods positioned in the trim housing support a stop plate and a movable slider. A cam is operably connected to the lever handle and positioned to rotate in response to rotation of the lever handle, converting its rotational movement to linear movement of the movable slider positioned adjacent to the cam. A lift arm is operably connected to the slider to engage and disengage door latches in response to movement of the slider when the door lever assembly is unlocked. When the door lever assembly is locked, an over-ride spring connected between the slider and the lift arm compresses in response to slider movement, preventing damage to components of the door lever assembly. When the door lever assembly is unlocked, a pivot rotates to control contact between the slider and the stop plate.

Abstract: An electromagnetic coil for use in a doorholder for retaining a door in an open position by magnetic interaction with an armature secured to the door includes a coil of wire for surrounding a core within a cup. A power control circuit including a resistor circuit, controls electrical power supplied to the coil, the power control circuit being mounted on a circuit board situated between the coil rear surface and the cup bottom. The resistor circuit being situated in sufficiently close proximity to the cup bottom for transfer of heat from the resistor circuit to the cup. The power control circuit also includes a low resistance circuit coupled to the resistor circuit, the low resistance circuit including a fusible link, the fusible link being selected to carry current when the power input terminals are coupled to a lower voltage power source and to stop carrying current when the power input terminals are coupled to a higher voltage power source.

Abstract: An electromagnetic doorholder for retaining a door in an open position by magnetic interaction with an armature secured to the door. The doorholder includes a core having a face confronting the armature and a coil of wire surrounding the core. A cup having an inside diameter somewhat greater than the coil outside diameter receives the coil, the core extending from the face to the cup bottom. A power control circuit including a resistor circuit controls electrical power supplied to the coil, the power control circuit being mounted on a circuit board situated between the coil rear surface and the cup bottom. The resistor circuit being situated in sufficiently close proximity to the cup bottom for transfer of heat from the resistor circuit to the cup.

Abstract: A door lever assembly having a locked and an unlocked position includes a trim housing and a lever handle and cam rotatably connected to the trim housing. A rotatable shaft extends between the lever handle and the cam, with the shaft defining a connection groove therethrough to provide access to a shaft interior. The shaft interior is configured to accept a pin for connecting the cam and the shaft. This pin can be wedgably disconnected following controlled slippage of frictional wedge surfaces in response to excessive force applied to rotate the cam.

Abstract: A door lever assembly having a locked and an unlocked position includes a trim housing and a lever handle rotatably connected to the trim housing. A cam is rotatably connected to the trim housing, and a pin mechanism is movably positionable to connect with the lever handle. A slider is attached for movement in the trim housing in response to rotation of the cam, anda lift arm is connected to the slider. The lift arm is rigidly movable with the slider when the door lever assembly is in its unlocked position and the lever handle is rotated. When the door lever assembly is in its locked position, the lift arm pivots toward the cam to disengage the pin mechanism from its connection between the lever handle and the cam.

Abstract: A door lever assembly for disengaging an unlocked latch of a lockable door latch assembly includes a lever handle rotatably connected to a trim housing and a cam operably connected to the lever handle. The cam is positioned to rotate in response to rotation of the lever handle, converting its rotational movement to linear movement of a movable slider positioned adjacent to the cam. An electrically activated block arm is positionable to prevent movement of the movable slider, effectively locking the door lever assembly.

Abstract: A mullion assembly mountable in a door frame includes a bottom fitting attached to a floor and a top fitting attached to the door frame above the bottom fitting. The top fitting supports a latch engagement assembly for engaging a latch assembly positioned in a mullion cavity of a mullion. The latch assembly has a latch extendable from the mullion cavity to engage the latch engagement assembly supported by the top fitting and hold the mullion in a fixed position. Retraction of the latch is controlled by a key lock assembly connected to the latch assembly through an actuating link assembly. The key lock assembly permits key controlled disengagement of the latch from the latch engagement assembly, followed by temporary removal of the mullion from its position in the door frame.

Abstract: A latch assembly for a fire door having a pushpad for emergency exit is described. The pushpad is connected to a rod to transfer motion of the pushpad to the latch assembly. The latch assembly includes a platform attached to the fire door, a linkage assembly attached between the rod and a latch bolt, and a deadlock arm assembly attached to the platform. The deadlock arm assembly is movable between a first position to block movement of the linkage assembly and a second position to allow movement of the linkage assembly. A fire fuse assembly is also attached to the linkage assembly to move the deadlock arm assembly out of its first position blocking movement of the linkage assembly at normal room temperature.

Abstract: An overhead mounted door holder assembly for attachment between a door jamb and a door, to hold the door in an open position, includes a jamb bracket attached to the door jamb and a jamb arm pivotally attached to the jamb bracket. A channel assembly having a longitudinally extending channel is attached to the door, and first and second end caps are attachable to opposing ends of the channel assembly, with each end cap being held by a retaining key in locked connection with the channel assembly. The first and second end caps are configured to allow alternate positioning of the channel assembly inset in a top of the door or attached to a side of the door. A hold open stop is fixably held in the channel of the channel assembly. The hold open stop is configured to have a stop element for engaging a slide assembly pivotally attached to the jamb arm and positioned for longitudinal movement in the channel.

Abstract: A mullion assembly mountable between a floor and a door frame includes an engagement assembly attached to either the floor or the door frame. A mullion defining a mullion cavity is positioned in removable attachment with the engagement assembly, and a cylinder lock assembly is positioned in the mullion cavity. The cylinder lock assembly has a key lock cylinder configured for positioning in either a locked position to engage the engagement assembly and hold the mullion in an upright position in the door frame, or in an unlocked position disengaged from the engagement assembly to permit removal of the mullion from the doorway.

Abstract: An overhead mounted door holder assembly, for attachment between a door jamb and a door, to hold the door in an open position includes a jamb bracket attached to the door jamb and a jamb arm pivotally attached to the jamb bracket. A channel assembly having a longitudinally extending channel is attached to the door. A slide assembly is disposed within the channel and is pivotably connected to the jamb arm. A slide catch on the slide assembly is provided for the door holding function. First and second springs are attached to the channel assembly and positioned within the channel, and a spring mounted catch is attached to the first and second springs. In operation, the spring mounted catch is pivotably positioned in the channel to engage the slide catch and reversibly hold the door in an open position.

Abstract: An adjustable overhead mounted door holder assembly for attachment between a door jamb and a door to hold the door in an open position includes a jamb bracket attached to the door jamb and a jamb arm pivotally attached to the jamb bracket. A channel assembly having a longitudinally extending channel is attached to the door, and a spring assisted assembly holds the door in an open position assisted by frictional force. The amount of friction is adjustable by altering a rotational position of an eccentric cam.

Abstract: A door holder assembly, for attachment between a door jamb and a door, to hold the door in an open position includes a jamb bracket attached to the door jamb and a jamb arm pivotally attached to the jamb bracket. A channel assembly having a longitudinally extending channel is attached to the door, and a hold open stop is fixed in the channel of the channel assembly. The hold open stop is configured to have a stop element with a first ramp and a second ramp engageable by a slide assembly. The slide assembly is pivotally attached to the jamb arm and positioned for longitudinal movement in the channel, with the slide assembly having a slide frame configured to support a rocker pivotably connected to the slide frame. The rocker has a catch on one side of a pivot and rocker face on the opposite side of the pivot, with the catch configured to slide over the first ramp for reversible engagement with the second ramp of the stop element to hold the door in an open position.

Abstract: A door lever assembly for disengaging an unlocked latch of a lockable door latch assembly includes a lever handle rotatably connected to a trim housing and a cam operably connected to the lever handle. The cam is positioned to rotate in response to rotation of the lever handle, converting its rotational movement to linear movement of a movable slider positioned adjacent to the cam. A lift arm is operably connected to vertical rods of the door latch assembly and an over-ride spring is connected between the slider and the lift arm. The over-ride spring transmits motion of the slider to the lift arm to lift the lift arm and the connected vertical rods when the door latch assembly is in an unlocked position. The over-ride spring compresses in response to slider movement when the blocking slide is positioned to block movement of the lift arm when the door latch assembly is in its locked position, preventing damage to components of the door lever assembly.

Abstract: A mullion assembly mountable in a door frame includes a bottom fitting attached to a floor and a top fitting attached to the door frame above the bottom fitting. The top fitting supports a bolt engagement assembly for engaging a lock assembly positioned in a mullion cavity of a mullion. The lock assembly has a bolt extendable from the mullion cavity to engage the bolt engagement assembly supported by the top fitting and hold the mullion in a fixed position. Retraction of the bolt is controlled by a key lock assembly that allows controlled access disengagement of the bolt from the bolt engagement assembly, followed by pivoting movement of the mullion away from its upright position in the door frame.

Abstract: An overhead door holder assembly, for attachment between a door jamb and a door, to hold the door in an open position includes a jamb bracket attached to the door jamb and a jamb arm pivotally attached to the jamb bracket. A channel assembly having a longitudinally extending channel is attached to the door, and one of a group of modular slide assemblies that interchangeably fit into the channel assembly can be selected for pivotal attachment to the jamb arm. The slide assemblies have attached polymeric blocks that reduce wear caused by sliding components and may have door hold and door stop provisions as well.

Abstract: A mechanism for dogging a door latch assembly of a panic exit device having a retractible door latch biased to move outward from the door latch assembly, with inward movement of the door latch being activated by a push bar, includes a mechanism for holding a key cylinder positioned adjacent to the door latch assembly. A catch mechanism linked to the door latch is configured to move as the door latch is retracted, and a arm is pivotably mounted adjacent to the key cylinder holding mechanism. The arm is configured to retain the catch mechanism, with the door latch being prevented from outwardly moving with respect to the door latch assembly.