Pin extraction tool

Details Pin extraction tool Pin extraction tool

1999-11-23

2001-08-28

Young, Lee (Department: 3729)

Metal working

Means to assemble or disassemble

Means comprising hand manipulatable tool

C029S278000, C081S345000

Reexamination Certificate

active

06279216

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to a pin field on a backplane of an electronic system and, more particularly, to a tool for extracting a selected pin from the pin field.
Modern electronic systems equipment, such as for telecommunications purposes, is often constructed as modular circuit packs inserted into guide slots of mechanical card cages, or shelf units, for engagement with a backplane mounted to the shelf unit at the inward ends of the guide slots. Such a backplane typically includes a pin field with delicate pins press fit into openings in the backplane for the interconnection of the circuit packs. These pins are sometimes damaged and can be difficult to repair or replace due to the tight packing of the pin field.
Tools are currently available for extracting a pin from such a pin field. However, such commercially available tools all suffer from a number of disadvantages. The tools typically include a trigger-like operating mechanism in a bulky housing which blocks the visibility of the pin to be removed. Also, since the housing is relatively bulky, it is difficult to maneuver the tool close to the side of the card cage. Further, it may be necessary to remove adjacent circuit packs to have access to a damaged pin, which disrupts the operation of the system. Still further, all such tools are relatively expensive.
Accordingly, it would be desirable to have a pin extraction tool which is economical and does not suffer from the aforedescribed disadvantages.
SUMMARY OF THE INVENTION
The present invention provides a tool for extracting a press fit pin from an opening in an object. The tool comprises a shaft having first and second ends and a chuck mounted to the first end of the shaft, with the chuck having a plurality of jaws adapted to grip the pin therebetween. An abutment is secured to the second end of the shaft and a weight is slidably mounted on the shaft between the chuck and the abutment. Accordingly, after a pin is held by the chuck, the weight is slid along the shaft to contact the abutment. The kinetic energy imparted by the weight to the shaft acts to pull the pin from the opening in the object.
In accordance with an aspect of this invention, each of the jaws has an internal gripping surface and an opposed external camming surface which tapers outwardly from the first end of the shaft. The chuck further includes a sleeve slidable over the plurality of jaws. The sleeve cooperates with the camming surfaces to cause the internal gripping surfaces to move toward each other as the sleeve is moved away from the shaft first end.


REFERENCES:
patent: 3008228 (1961-11-01), Crotty

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