Plated-Through Hole Clearing Tool
Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09
Plated-through holes (PTHs) on printed circuit boards (PCBs) are occasionally plugged with debris during the various manufacturing processes, e.g., vapor blast slurry, copper nodules, etc. These plugged PTHs can be cleared by utilizing a magnetic breakaway mechanism which limits the amount of force that can be applied, thereby minimizing the risk of damage. The tool is used in the following manner. As seen in Fig. 1, the tool 1 consists of a base plate 2 secured to assembly body 3 by means of a countersunk flat head screw (not shown). Mounted on body 3 is a guide bushing 5 for a plunger 6 Fig. 2, which is a cross-section of tool 1 that is recessed in plunger housing 7. The tool 1 works when placed on the surface of a PCB (not shown) over the PTH (not shown) to be cleared.