Electric heating – Metal heating – By arc
Patent
1977-04-14
1978-06-13
Truhe, J. V.
Electric heating
Metal heating
By arc
83365, B23K 900, B26D 500
Patent
active
040950840
ABSTRACT:
An elongate member, such as a tube, is perforated at intervals by intermittently feeding the member endwise through a perforating station containing a laser for directing a laser beam against the member, and pulsing the laser in timed relation to the intermittent movement of the member to produce a laser beam pulse of sufficient duration and intensity to form a hole in the member at selective times or each time when the member is arrested at the station. The particular member described is a thin walled flexible plastic drip irrigation tube which is flattened upon reaching the perforating station, preferably being pre-flattened, and which may have a single water passage defined by two walls, or which may have a primary water passage bounded by a first tube wall and a secondary water passage bounded by the first wall and a second outer tube wall. The laser beam pulses may be regulated in such a manner that the pulses penetrate only one wall of the two-wall type or, in the case of the three-wall type, so that certain of the pulses penetrate both walls to form holes in the first wall for communicating the tube passages, and the intervening pulses penetrate only the second outer wall to form water drip openings in the latter wall.
REFERENCES:
patent: 3552252 (1971-01-01), Maxey et al.
patent: 3582466 (1971-06-01), Quirk
patent: 3796117 (1974-03-01), Mukai et al.
patent: 3808394 (1974-04-01), Mominee et al.
patent: 4013261 (1977-03-01), Steigerwald et al.
Bell Fred E.
Haefliger William W.
Truhe J. V.
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