Exit device
AssigneeScovill Inc.
InventorsWilliam A. Krupicka, Lawrence D. Butts, Sidney J. Lampley
Life of this patent
Estimating the term…
Abstract
Exit device has auxiliary bolt which when held in by door strike permits a blocking leg to prevent unauthorized forced retraction of main latch bolt. Normal operation of device by panic bar pivots blocking leg out of the way and then retracts main latch bolt.
Claims6
An exit device comprising a horizontal panic bar, adapted to be mounted waist-high on a swinging door, a latch housing adapted to be secured outward of the door adjacent an end of the panic bar, the latch housing holding a vertically reciprocable slide having similar but opposite cam surface thereon converging to a low point, a latch bolt having stop means thereon and being pivotally mounted in the housing about a vertical axis and moveable from an extended to a retracted position, the latch bolt having follower means normally engaging the cam surfaces at the said low point whereat the latch bolt is extended, lever means pivotally mounted intermediate its ends in the housing on a horizontal pin, one end of the lever held captive in the slide, the other end extending out beyond the housing at an angle and adapted to be engaged by the panic bar, a blocking leg pivotally mounted in the housing on a vertical axis, the leg occasionally being in blocking position with respect to the stop means, and connecting means between the horizontal pin and the blocking leg so that the initial rotary movement of the horizontal pin upon depression of the panic bar moves the blocking leg so it does not block the retraction of the latch bolt.
An exit device comprising a horizontal panic bar, adapted to be mounted waist-high on a swinging door, a latch housing adapted to be secured outward of the door adjacent an end of the panic bar, the latch housing holding a vertically reciprocable slide having an inclined cam surface, a latch bolt having stop means thereon and being pivotally mounted in the housing about a vertical axis and moveable from an extended to a retracted position, the latch bolt having follower means normally engaging the cam surface at the point whereat the latch bolt is extended, lever means pivotally mounted intermediate its ends in the housing on a horizontal pin, one end of lever connected to the slide, the other end extending out beyond the housing at an angle and adapted to be engaged by the panic bar, a blocking leg pivotally mounted in the housing on a vertical axis, the leg occasionally being in blocking position with respect to the stop means, and interfitting means on the horizontal pin and the blocking leg so that the initial rotary movement of the horizontal pin upon depression of the panic bar moves the blocking leg so it does not block the retraction of the latch bolt.
Dependencies are inferred from the claim text.