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Universal Backer Assembly

IP.com Disclosure Number: IPCOM000086227D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 40K

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This assembly provides an automatic back up support for printed-circuit cards under test conditions.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 70% of the total text.

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Universal Backer Assembly

This assembly provides an automatic back up support for printed-circuit cards under test conditions.

Test probe pins, not shown, make contact with side 10 of the test card 11 and this force is balanced by the actuator pins 12 from the device shown, which provides a locking force on the component side of the card 11.

At the start of operation, a tandem two-stage air cylinder 13 is fully retracted, and the test card 11 is positioned to be tested. (See 1st stage drawing.)

Air is then supplied to the air cylinder 13 which moves the collet support plate 14 down to the position shown on the 2nd-stage drawing. Air is also supplied to the air manifold 15, which feeds down through small tubes 16 inside of the actuator pins 12.

This causes the actuator pins 12 to slide down through the collets 17 until the actuator pins 12 either rest on the test card 11 or a card component 18. When all these pins have come to rest at some position on the card, air is supplied to the air cylinder 13 pushing the collet retainer plate 14 downward (see 3rd-stage drawing).

The collets 17 slide down the outside diameter of the actuator pins 12, until the head of the collet is forced into the collet lock plate 19 compressing the collet 17 and locking the actuator pins 12 in position.

As shown, each of the actuator pins 12 exerts pressure on either the back of the card 11 or on a component 18 which they are touching. A modification of this device makes it possible to onl...