Latch mechanism for a plug-in cartridge or the like

• US 4,947,289 A
• Filed: 10/19/1989
• Issued: 08/07/1990
• Est. Priority Date: 10/19/1989
• Status: Expired due to Term

• Current Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Original Assignee: Northern Telecom Limited (Nortel Networks Corporation)
• Inventors: Dynie, Ernest R.
• Primary Examiner(s): Thompson, Gregory D.
• Application Number:
  US07/424,033
• Time in Patent Office: 292 Days
• Field of Search: 211/41, 361/391, 361/399, 361/412, 361/413, 361/415, 403/16, 403/321, 403/322, 439/152, 439/153, 439/155, 439/157, 439/159, 439/160, 439/180, 439/59-62, 439/325, 439/327-329
• US Class Current: 361/801
• CPC Class Codes: H05K 7/1409 by lever-type mechanisms
• CPC Class Codes: Y10T 403/59 Manually releaseable latch type

Abstract

A latching mechanism for use with a plug-in cartridge or the like. The latching mechanism comprises a body portion; a pair of walls extending from the body portion; a camming portion; and an actuating portion. The walls of the latching mechanism are snap locatable onto pivot pins on a face plate of the plug-in cartridge, or the like, and thereby allow the latching mechanism to pivot on the face plate. Furthermore, the walls of the latching mechanism have apertures which are snap locatable onto detents on the face plate thereby resiliently latching the latching mechanism when it is fully inserted into a cabinet. The camming portion projects from the latching mechanism and is used for engaging a cooperating projection on a cover of the cabinet. The camming portion and the actuating portion cooperate to function as a lever, the camming portion being engageable with an inside surface of a mating apparatus to establish a first engagaement about which the latching mechanism is levered to overcome an insertion force, and engageable with an outside surface of the mating apparatus to establish a second engagement about which the latching mechanism is levered to overcome an extraction force. When the latching mechanism is in a latched position the latching mechanism is flush with the face plate. To disengage the latching mechanism from the detents, the actuating portion must be levered out from the face plate by a blade, or the like.

Claims

1. The combination of a printed circuit board (PCB), a face plate attached to one end of said PCB and a latching mechanism for use in aiding the insertion of said PCB into a mating apparatus, for securing said PCB in said mating apparatus, and for aiding the extraction of said PCB from said mating apparatus, said combination characterized by:

said latching mechanism comprising;

a body portion;

a pair of walls extending from said body portion, facing portions of said walls having means for rotatably mounting said latching mechanism on opposite faces of said face plate, the facing portions of said walls also having facing channels snap locatable onto detents on said opposite faces of said face plate to resiliently latch said latching mechanism when said PCB is fully inserted into said mating apparatus;

a camming portion projecting form an end of said body portion, said camming portion adapted to engage a projection on said mating apparatus; and

an actuating portion providing leverage for said camming portion;

said camming portion and said actuating portion cooperating to function as a lever, said camming portion adapted to engage an inside surface of said projection to establish a first engagement about which said latching mechanism is levered to overcome an insertion force, and adapted to engage an outside surface of said projection to establish a second engagement about which said latching mechanism is levered to overcome an extraction force.

2. The combination as claimed in claim 1 wherein said means for rotatably mounting said latching mechanism is a pair of apertures, one aperture in each wall of said pair of walls, each aperture of said pair of apertures adapted to permit insertion of one pin of a pair of pins on said opposite faces of said face plate, said walls being resiliently flexible to allow said latching mechanism to be assembled over said pins until said pins snap into a respective aperture.

3. The combination as claimed in claim 1 or 2 wherein said latching mechanism assumes a flush position against said face plate when said PCB is inserted in said mating apparatus and said latching mechanism is in a latched position.

4. The combination as claimed in claim 1 or 2 further comprising an additional latching mechanism identical to said latching mechanism said latching mechanism and said additional latching mechanism are located at opposite ends of said face plate and oriented such that said actuating portion of said latching mechanism faces said actuating portion of said additional latching mechanism to thereby allow latching to said mating apparatus at opposite ends of said face plate.