Electric heating – Metal heating – For bonding with pressure
Patent
1976-04-19
1978-08-29
Truhe, J. V.
Electric heating
Metal heating
For bonding with pressure
219 85G, 228 52, B23K 104
Patent
active
041105915
ABSTRACT:
An apparatus--for brazing tungsten carbide tips (also known as "inserts") on circular saw teeth--which includes instrumentalities to practice a method comprising, with respect to each saw tooth, the following steps: (1) clamping an initially separate tip between two opposed carbon electrodes interposed in a resistance circuit; (2) closing the circuit whereby the clamped-in-placed tip is heated red hot; (3) opening the circuit and then delivering a small quantity of brazing paste (flux and solder) on the hot tip; (4) moving an arbor-mounted circular saw until a selected tooth thereof bears on the clamped-in-place tip--the brazing paste then being between said tip and an edge of the tooth; and (5) then re-energizing the resistance circuit whereby the tip again becomes red hot and brazes to said tooth.
The instrumentalities of the apparatus include means mounting the opposed carbon electrodes for powered relative axial motion whereby to clamp a tip therebetween, and a brazing paste feeder unit including an applicator; the latter being mounted for movement between a normally retracted point (at which the applicator is inactive) and an advanced point (at which the applicator is active) to deliver a small quantity of brazing paste on the clamped-in-place tip; there being an arbor disposed to support the circular saw for movement such that the selected saw tooth can be brought to bear directly on said clamped-in-place tip.
REFERENCES:
patent: 2673279 (1954-03-01), Drake
patent: 2986108 (1961-05-01), Calehuff et al.
patent: 3340378 (1967-09-01), Miller
patent: 3740521 (1973-06-01), Bullard
California Cedar Products Company
Shaw Clifford C.
Truhe J. V.
Webster Roger B.
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