Work holders – With fluid means – Cylinder-piston means in series with additional positioning...
Patent
1985-05-24
1986-10-21
Schmidt, Frederick R.
Work holders
With fluid means
Cylinder-piston means in series with additional positioning...
29760, 269 58, 269233, 269903, B23Q 308
Patent
active
046181318
ABSTRACT:
A hold down system for use with a generally planar printed circuit (PC) board includes at least one clamp which engages the circuit board and securely maintains it flat upon a circuit board transport mechanism to facilitate the insertion of electronic components upon the board by automatic positioning and insertion apparatus. The movable hold down clamp includes an elongated, generally vertically oriented housing which is positioned beneath the PC board and transport mechanism and is displaced upward above the PC board for engaging the board and pulling it downward upon the transport mechanism as the PC boards are displaced therealong. With an upper portion of the clamp extending above the circuit board either along an edge thereof or through an aperture therein, a pneumatically actuated hold down arm is extended laterally from the housing above the PC board and is displaced downward so as to engage the board's upper surface and pull the board downward and in tight-fitting engagement with the supporting transport mechanism. The PC board is thus securely maintained in a flat configuration and a fixed orientation and position during component insertion, testing, etc. Following component insertion on the PC board, the hold down arm is retracted, releasing the circuit board and the clamp is displaced downward allowing the transport mechanism to position another PC board above the hold down clamp whereupon the hold down procedure is repeated.
REFERENCES:
patent: 1823204 (1931-09-01), Long
patent: 1948799 (1934-02-01), Oyster
patent: 2737709 (1956-03-01), Lovelace
patent: 3724837 (1973-04-01), McPherson
patent: 4331326 (1982-05-01), Strauss
patent: 4508327 (1985-04-01), Ersoy
Campisi Carl
Kay Brian D.
Schad Steven P.
Schmidt Frederick R.
Zenith Electronics Corporation
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