Latch assembly

• US 6,494,509 B2
• Filed: 11/16/2001
• Issued: 12/17/2002
• Est. Priority Date: 03/13/1998
• Status: Expired due to Term

• Current Assignee: Allegis Corporation (Huron Consulting Group Incorporated)
• Original Assignee: Austin Hardware, Inc.
• Inventors: Molzer, Klaus
• Primary Examiner(s): ESTREMSKY, GARY WAYNE
• Application Number:
  US09/991,228
• Publication Number:
  US 20020030367A1
• Time in Patent Office: 396 Days
• Field of Search: 292/200, 292/202, 292/205, 292/207, 292/210, 292/226, 292/336.3, 292/DIG.30, 292/DIG.62, 702/08, 702/03, 702/09, 702/24, 702/10, 702/12, 70D/IG.63
• US Class Current: 292/336.3
• CPC Class Codes: E05B 13/10 formed by a lock arranged in the handle
• CPC Class Codes: E05B 13/106 for handles pivoted about an axis perpendicular to the wing E05B13/101, E05B13/103, E05B13/105 take precedence
• CPC Class Codes: E05B 35/12 requiring the use of two keys, e.g. safe-deposit locks locks with key-operated keyhole cover E05B17/142
• CPC Class Codes: E05B 63/0056 Locks with adjustable or exchangeable lock parts adjustable strikers E05B15/024; adjustable to different keys E05B35/083; adjustable bolt or backset E05B63/06; adjustable coupling means for bars, rods, cables E05C9/20
• CPC Class Codes: E05B 67/383 Staples or the like for padlocks; Lock slings; Arrangements on locks to cooperate with padlocks
• CPC Class Codes: Y10S 292/62 Lost motion connections
• CPC Class Codes: Y10T 292/1059 Lever
• CPC Class Codes: Y10T 292/57 Operators with knobs or handles
• CPC Class Codes: Y10T 70/5779 With padlock

Abstract

A latching assembly that requires three distinct operations must be performed with two hands to allow the handle of the latch assembly to be rotated to unlock a cabinet door or the like. The assembly provides substantial flexibilities in installation. A base portion is secured to a door and receives a handle portion with a shaft attached, the shaft extending through the sleeve. Cooperative rotation restriction portions on the handle and on the base portion restrict the motion of the handle to a limited rotation range. Said limited rotation range may be altered by moving a key guide in one of the cooperative rotation restriction portions. A first release mechanism comprising a trigger portion which extends from the handle and a detent which engages a detent opening in the base portion requires depression of the trigger portion before rotation of the handle to an unlatched position. The detent mechanism is within the handle and a cap contained and encloses in the detent mechanism. The cap portion has a bore which receives a second release mechanism which has a shaft portion that may be exteriorly manipulated to move an obstructing member into and out of an obstructing relation with the detent. Thus, the second release mechanism must be manipulated to allow release of the trigger portion which must then be depressed to allow rotation of the handle. The cap portion is secured in the handle by screws or other threaded members extending from the handle base portion interface into the cap.

Claims

1. A latching assembly mounted to a door which engages a door frame, the door having an interior and an exterior, the assembly comprising:

a) a base portion which attaches to he door and extends through the door, said base portion having a frustoconically shaped collar portion;

b) a shaft which extends through the base portion and the door, he shaft at least partially rotatable with respect to the base portion and the door between a first position and a second position;

c) a handle having a head portion, the head portion configured for engagement to the base portion, said handle connecting to the shaft portion and having a grasping portion extending substantially normally to the shaft portion allowing at least partial rotation of said shaft portion as said handle is rotated, and

d) a first release mechanism comprising a trigger portion extending from the handle and a detent mechanism with a detent engaging with a slot in the base portion thereby preventing rotation of the handle and shaft with respect to the base portion, said detent mechanism configured to release from the slot by movement of the trigger portion toward the handle wherein a portion of said detent mechanism is shaped for rotation about said frustoconically shaped collar portion upon rotation of said handle relative to said base.