Hardware Specialties, Inc.

John K Berkseth

Michael W Kondratuk

The present invention is a door closer for controlling the rate a door is closed. The door closer includes a tubular cylinder closed at a first end. Slidably mounted within the tubular housing is a rod assembly that includes a piston at a first end. As the rod assembly is moved through the cylinder, air is drawn into and expelled from the cylinder. A hold open bracket is mounted on the rod assembly for locking the position of the rod assembly with respect to the cylinder. A pair of springs is mounted on the rod, one on each side of the hold open bracket, to maintain the hold open bracket in a neutral position in normal operation. A cover is slidably mounted over the second end of the cylinder to move the hold open bracket to a locked position.

Door cylinder

A reversible, double deadbolt latch bolt assembly for securing and locking a door is provided according to the invention. It comprises a lock body to which is slidably mounted a live bolt for movement between an extended position and a retracted position, the live bolt being operated by an actuator, such as a handle cam rotated by means of a door knob or lever-operated spindle. Also slidably mounted to the lock body are at least two cam-operated deadbolts on opposite sides of the live bolt for movement between a locked position and an unlocked position. These cams may optionally be linked to each other within the lock body, so that operation of one of the cams by, e.g., a key cylinder or thumb turn causes simultaneous operation of the other cam. Because of the symmetrical design and structure of the latch bolt assembly of the present invention, it enables a door into which it is inserted to be installed for both left-hand and right-hand hinged applications by mere flipping of the door by the installer without the need to remove the latch bolt assembly in order to further remove and invert the live bolt contained therein, as is customary within the industry. Alternatively, a bi-directional actuator for the live bolt can be used in conjunction with a single deadbolt, such combination still permitting the door to be flipped to accommodate both left-hand and right-hand hinged applications of a door during installation.

Reversible double deadbolt mortise latch

A quick cam latch mechanism having an operatively coupled bolt and cam assembly disposed in a latch housing. A handle is coupled to the cam assembly for moving the bolt between an extended or engaged position and a retracted or disengaged position. The cam assembly includes a primary cam operatively coupled to a secondary cam or linkage that is in turn operatively coupled to the bolt. Rotation of the primary cam translates into increased pivoting of the linkage and thereby increased retraction of the bolt. As a result, less rotation of primary cam is needed to retract the bolt. In an example embodiment of the invention, at least two linkages are utilized to quickly retract the bolt regardless of the direction of rotation of the handle.

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Rice Lake, WI, United States of America

John K Berkseth