초록 ▼

A exit bar for securing a door has a housing adapted for mounting to a door. A push pad for receiving a push force is mounted to the housing. A latch extends from the housing to releasably latch the door to which the exit bar is mounted. A link system links the push pad to the latch so that a push f

A exit bar for securing a door has a housing adapted for mounting to a door. A push pad for receiving a push force is mounted to the housing. A latch extends from the housing to releasably latch the door to which the exit bar is mounted. A link system links the push pad to the latch so that a push force exerted on the push pad releases the latch. An electromagnetic disposed in the housing causes an armature to engage the link system to retract the latch. The exit bar further dogs the latch in the unlatched position as long as the power control system for the electromagnet receives an operate signal and for a preestablished delay time after the operate signal has been removed.

대표청구항 ▼

[ What is claimed is:] [1.] An electromagnetic latch retractor for an exit bar mounted to a face of a door pivotally mounted in a door frame, the door frame including a latch strike, the exit bar including a housing adapted for mounting to the door face, a latch extending from the end of the housing

[ What is claimed is:] [1.] An electromagnetic latch retractor for an exit bar mounted to a face of a door pivotally mounted in a door frame, the door frame including a latch strike, the exit bar including a housing adapted for mounting to the door face, a latch extending from the end of the housing proximate the latch strike for releasably latching the door, a push pad defining an exposed push face for receiving a push force, and a link system linking the pad to the latch for retracting the latch when the pad is pushed, the latch retractor comprising:an electromagnet mounted within the housing, the electromagnet having a magnetic face;power supply means for selectively supplying high voltage electrical power to the electromagnet;an armature having oppositely disposed proximal and distal ends, a distal end portion and an inboard surface disposed oppositely the magnetic face of the electromagnet, the armature being pivotally mounted to the housing at a position intermediate the proximal and distal ends of the armature, the distal end portion of the armature being engageable with the link system; andbiasing means having a biasing force for biasing the proximal end of the armature toward the electromagnet and the distal end of the armature away from electromagnet, the inboard surface of the armature and the magnetic face of the electromagnet defining a wedge-shaped gap;wherein the electromagnet develops a high magnetic field when energized by the high voltage electrical power, the high magnetic field bridging at least a portion of the wedge-shaped gap and imposing a high magnetic force on the armature, the high magnetic force being greater than the biasing force, wherein the high magnetic force pushes the distal end of the armature toward the electromagnet and the distal end portion of the armature engages the link system and moves the link system to retract the latch.