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a set of internally threaded segments forming, in as- segment assembly with an annular space between
sembly, a threaded sleeve mating with the threads of the exterior of said segments and the interior of
said bolt, said sleeve assembly having surfaces at each said sleeve;
end, which diverge from the axis of said assembly; a 1ocking ring structure immovably mounted in the re-
a piston closely received in said chamber and reciproca- 5 lease end opening of said body, said locking ring
ble between a bolt-engaging position near the pres- structure being formed toward the pressure end of
sure end of said cylindrical chamber and a bolt- said body with a conical surface mating with the
releasing position near the release end of said cham- · release end conical surface of said segment assembly,
ber, said piston being comprised of a pressure head and said locking ring structure being provided with
at the pressure end and a depending sleeve opening 10 means engaging said segment assembly to lock it
toward the release end, said sleeve enclosing said against rotation within said body;
segment assembly with an annular space between the timing ring means enclosed within said piston sleeve
exterior of said segments and the interior of said between said pressure head and said threaded seg-
sleeve; ment assembly, said timing ring having a converg-
means engaging said segment ,assembly to lock it against 15 ing conical surface mating with and bearing on said
rotation within said body; pressure end of said threaded segment assembly,
a converging surface structure mating with the release said timing ring means being spaced longitudinally
end of said segments; away from the interior of said pressure head of said
timing ring means enclosed within said piston sleeve be- piston toward the release end of said body to permit
tween said pressure head and said threaded segment 20 an initial stage of releasing movement by said piston
assembly, said timing ring having a converging sur- before the interior of said pressure head makes driv-
face mating with and bearing on said pressure end ing engagement with the pressure end of said tim-
of said threaded segment assembly, said timing ring ing ring means;
means being spaced longitudinally away from the an annular shear flange on the exterior of said timing
interior of said pressure head of said piston toward 25 ring means;
the release end of said body to permit ,an initial stage a flange-shearing structure on the interior of said pis-
of releasing movement by said piston before the in- ton adapted to shear said flange from said timing
terior of said pressure head makes driving engage- ring;
ment with the pressure end of said timing ring means; a nestable structure in said annular space between said
an annular shear flange on the exterior of said timing 30 threaded segment assembly and the interior of said
ring means; piston sleeve including a pair of inwardly projecting
a flange-shearing structure on the interior of said piston annular shoulders on the interior wall of said piston
adapted to shear said flange from said timing ring; sleeve and a pair of outwardly projecting annular
a nestable structure in said annular space between said shoulders on the exterior of said threaded assembly,
threaded segment assembly ,and the interior of said 35 said nested structure being held in an abutting posi-
piston sleeve including an annular shoulder on one of tion with said segments in engagement with the
said parts mating with an adjacent annular groove on threads of said bolt, as long as said piston remains in
the other, said nested structure being held in an abut- said bolt-engaging position in the pressure end of
ting position with said segments in engagement with said chamber, but being adapted to nest radially out-
the threads of said bolt, as long as said piston remains 40 ward upon longitudinal movement of said piston
in said bolt-engaging position in the pressure end of toward said release position;
said chamber, but being adapted to nest radially out- and squib means for discharging propulsion gases into
ward upon longitudinal movement of said piston to- said pressure chamber within the pressure end of
ward said release position; said cylindrical chamber, and drive said piston to-
and means for discharging propulsion fluid into said 45 ward said release end, shearing said shear flange from
pressure chamber within the pressure end of said said timing ring means, and in sequence, displacing
cylindrical chamber, and drive said piston toward said annular nesting structure from unnested to
said release end, shearing said shear flange from said nested position, and telescoping said timing ring
timing ring means, and in sequence, displacing said towards said Jocking ring to produce radial bolt-re-
annular nesting structure from unnested to nested po- 50 leasing movement of said segments.
sition, and release end telescoping said timing ring 4. An exp1osive nut device for releasably holding in
towards said locking ring to produce radial bolt- assembly a bolted structure comprised of ,a bolt 0 head part,
releasing movement of said segments. a nut-held part, and a bolt for holding said parts in as-
3. An explosive nut device for releasably holding in sembly, which device comprises:
assembly, a bolted structure comprised of a bolt-head part, 55 a body having an internal cylindrical chamber axially
a nut-held part, and a bolt for holding said parts in as- ,aligned with said bolt, said chamber extending longi-
sembly, which device comprises: tudinally from a release end ·having an opening for
a body having an internal cylindrical chamber axially the reception of the threaded shank of said bolt, to
aligned with said bolt, said chamber extending longi- a pressure end enclosing a pressure chamber, and
tudinally from a release end having an opening for 60 having a mounting location for an explosive squib
the reception of the threaded shank of said bolt, means;
to a pressure end enclosing a pressure chamber, and a set of internally threaded segments forming, in as-
having ,a location for an explosive squib means; sembly, a threaded sleeve mating with the threads of
a set of internally threaded segments forming, in as- said bolt, said sleeve assembly having outwardly flar-
sembly, a threaded sleeve mating with the threads of 65 ing conical surfaces at each end;
said ,bolt, said sleeve assembly having outwardly a piston closely received in said chamber and recipro-
flaring conical surfaces at each end; cable between a bolt-engaging position near the pres-
a piston closely received in said chamber and recipm- sure end of said cylindrical chamber and a bolt-re-
leasing position near the release end of said cham-
cable between a bolt-engaging position near the pres- 70 ber, said piston being comprised of a pressure head
sure end of said cylindrical chamber and a bolt- at the pressure end and a depending sleeve opening
-releasing position near the release end of said cham- toward the release end, said sleeve enclosing said seg-
ber, said piston being comprised of a pressure head ment assembly with an annular space between the
at the pressure end and a depending sleeve opening exterior of said segments and the interior of said
toward the release end, said sleeve enclosing said 75 sleeve;