Back to results
US 4,063,720 AGranted
Automatic unplugging aluminothermic welding crucible
OwnerCamille Boutet, Andre Fevreinventors
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
OwnerCamille Boutet, Andre Fevreinventors
Estimating the term…
The invention relates to an automatic unplugging aluminothermic welding crucible comprising a crucible per se made of refractory material, shaped generally as a truncated cone with a vertical axis, said cone tapering inwardly to the lower base thereof and comprising a conical hole receiving a crown provided with a conical bore, said conical bore receiving a casting socket, the conduit thereof being sealed by sealing means before filling of said crucible, said sealing means comprising a plug made of an aluminothermic compound consisting of iron oxide and aluminum agglomerated with a suitable binder, said plug resting on a steel washer. According to the invention, said sealing means comprise a plug made of an aluminothermic compound consisting of iron oxide and aluminum agglomerated with a suitable binder, for example, made of silicate.
In an aluminothermic welding crucible made of refractory material, shaped generally as a truncated cone with a vertical axis, said cone tapering inwardly to a lower base thereof and comprising a conical bore, a plugging means disposed within said conical bore for sealing the lower base of said crucible before it is filled, the improvement wherein said plugging means consists of a casting socket disposed in said bore and extending at least partially through said bore, said socket having a bore and a counterbore which join to form a shoulder facing the inside of the crucible;
An aluminothermic welding crucible having an inverted frusto-conically shaped refractory wall which encloses an inverted frusto-conically shaped chamber for melting metal, a first bore through the wall extending from the said chamber adjacent to its smallest cross-section to externally of the crucible, said first bore having an inverted frusto-conical shape, and means for sealing said first bore comprising a socket having a cross-section corresponding to that of said first bore disposed in the first bore, a second bore and a counterbore joining to provide an opening through the socket for flow of molten metal from the said chamber, said counterbore communicating with the chamber and being of larger cross-section than the second bore thereby joining the second bore to provide a shoulder which faces the chamber, a thin washer which will melt when contacted by said molten metal disposed on the shoulder, a plug made of iron oxide and aluminum agglomerated with a binder disposed on the washer and filling the counterbore above the washer, said plug having dimensions and composition whereby it melts within a predetermined time while in contact with said molten metal to unplug said counterbore, the composition of the washer being substantially the same as that of the said molten metal to avoid contamination thereof.
Dependencies are inferred from the claim text.