Metal working – Method of mechanical manufacture – Assembling or joining
Reexamination Certificate
1999-09-29
2001-03-27
Hughes, S. Thomas (Department: 3726)
Metal working
Method of mechanical manufacture
Assembling or joining
C029S251000, C029S525000, C227S015000, C100S22900A
Reexamination Certificate
active
06205641
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to presses of the type for inserting fasteners or the like into a workpiece, and more particularly to an anvil for such presses.
BACKGROUND OF THE INVENTION
Various fastening systems have been devised to mount electronic components to circuit boards. One system includes the mounting of threaded studs which are soldered directly to the circuit board after being inserted into holes in the board. Press-in type circuit board fasteners are inserted into printed circuit board mounting holes, and the fastener is pressed between a punch and opposing anvil. The anvil has a substantially planar face abutting the underside of the circuit board. In the assembly process, it is desirable that the underside of the printed circuit board remain smooth after the fastener is inserted for proper operation of the printed circuit board and for stacking requirements. However, because of misalignment of the fastener, improper operation of the press, or due to the thickness of the printed circuit board, it is possible that extruded material will protrude on the underside of the printed circuit board after the fastener is inserted. This protrusion necessitates circuit board repair which is costly and time consuming.
A need has thus arisen for a press, and more particularly for an anvil assembly for ensuring proper insertion of fasteners into a printed circuit board without fastener material protrusion on the underside of the board.
SUMMARY OF THE INVENTION
In accordance with the present invention, an anvil for a press for assembling a fastener to a plate is provided. The plate includes an aperture. The press includes a ram assembly for pressing the fastener into the plate aperture. The anvil includes a housing and a pin disposed in the housing. The pin is slidable between an extended position, partially extending outwardly of the housing and is adapted to extend through the plate aperture. The pin moves to a retracted position disposed within the housing for contact with the bottom surface of the plate. The anvil further includes a collar disposed in the housing and concentrically disposed around the pin. The collar includes a plurality of spaced apart collar sections, each collar section having a bottom flange retained by the housing and a top flange. The collar sections are movable between an expanded position when the pin is in the extended position, and a collapsed position when the pin is in the retracted position within the housing. The collar sections top flanges engage the pin top surface in the pin retracted position to form a barrier below the plate aperture to prevent extruded material from protruding on the plate bottom surface after the fastener is inserted into the plate.
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Brumley James Randell
Martin Jon P.
Woods, Jr. William L.
Hong John C.
Hughes S. Thomas
Locke Liddell & Sapp LLP
Lucent Technologies - Inc.
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