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,a locking ring structure immovably mounted in the re- toward the release end of said body to permit an
lease end opening of said body, said locking ring initial stage of releasing movement by said piston
structure being formed toward the pressure end of before the interior of said pressure head makes driv-
said body with a conical surface mating with the re- ing engagement with the pressure end of said timing
lease end conical surface of said segment assembly, 5 ring means;
and said locking ring structure being pmvided with an annular shear flange on the exterior of said timing
means engaging said segment assembly to lock it ring means;
against rotation within said body; a flange-shearing structure on the interior of said piston
timing ring means enclosed within said piston sleeve adapted to shear said flange from said timing ring;
-between said pressure head and said threaded seg- 10 a pair of inwardly projecting annular shoulders on the
ment assembly, said timing ring having a converg- interior wall of said piston sleeve;
ing conical surface mating with and bearing on said a pair of outwardly projecting annular shoulders on
pressure end of said threaded segment assembly, said the exterior of said threaded assembly, said segment
timing ring means being spaced longitudinally away shoulders mating with said sleeve shoulders, and
from the interior of said pressure head of said piston 15 adapted to be held in an abutting position with said
toward the release end of said body to permit an threaded segments engaged with said bolt threads,
initial stage of releasing movement by said piston be- when said piston is in the bolt-engaging position in
fore the interior of said pressure head makes driv- the pressure end of said cylindrical chamber, and
ing engagement with the pressure end of said timing adapted to move outwardly in ne,sting engagement
ring means; 20 with each other upon movement of said piston to-
a pair of inwardly projecting annular shoulders on the ward said release position, and to impart longitudi-
interior wall of said piston sleeve; nal movement to said segments toward release posi-
a pair of outwardly projecting annular shoulders on tion during the latter part of said piston movement;
the exterior of said threaded assembly, said segment and squib means for discharging propulsion gases into
shoulders mating with said sleeve shoulders, and 25 the pressure end of said cylindrical chamber, and
adapted to be held in an abutting position with said drive said piston toward said release end, shearing
threaded segments engaged with said bolt threads, said shear flange from said timing ring means, and
when said piston is in the bolt-engaging position in displacing said annular nesting shoulders from un-
the pressure end of said cylinder, and adapted to nested to nested position, and telescoping said timing
move outwardly in nesting engagement with each 30 ring towards said locking ring to produce radial bolt-
,other upon movement of said piston toward said releasing movement of said segmen[s.
release position; 6. A combination as described in claim 5 in which
and squib means for discharging propulsion gases into said squib is removable and propulsion gases are con-
the pressure end of said cylindrical chamber. fined to said chamber after release of said bolt by sta-
5. An explosive nut device for releasably holding in 35 tionary seal means encircling said removable squib and
assembly a bolted structure comprised of a bolt-head moving seal means encircling said piston.
part, a nut-held part, and a bolt for holding said parts in 7. An explosive nut device for releasably holding in
assembly, which device comprises: assembly a bolted structure comprised of a bolt-head
a body having an internal cylindrical chamber axially part, a nut-held part, and a bolt for holding said parts in
aligned with said bolt, said chamber extending longi- 40 assembly, which device comprises:
tudinally from a release end having an opening for a body ·bearing on said nut held pant and having an
the reception of the threaded shank of said bolt, to a internal cylindrical chamber axially aligned with
pressure end enclosing a pressure chamber, and hav- said bolt,· said chamber extending longitudinally
ing a mounting location for an explosive squib from a release end having an opening for the recep-
means; 45 tion of the threaded shank of said bolt, to a pressure
a set of internally threaded segments forming, in as- end enclosing a pressure chamber, and having a
sembly, a threaded sleeve mating with the threads mounting location for an explosive squib means;
of said bolt, said sleeve assembly having outwardly a set of internally threaded segments forming, in as-
:flaring conical surfaces at each end; sembly, a threaded sleeve mating with the threads
a piston closely received in said chamber and re- 50 of said bolt, said sleeve assembly having outwardly
ciprocable between a bolt-engaging position near the flaring conical surfaces at each end;
pressure end of said cylindrical chamber and a bolt- a piston closely received in said chamber and recipro-
releasing position near the release end of said cham- cable between a bolt-engaging position near the pres-
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 55 releasing position near the release end of said cham-
toward the release end, said sleeve enclosing said ber, said piston being comprised of a pressure head
segment assembly with an annular space between the at the pressure end and a dependilllg sleeve opening
exterior of said segments and the interior of said toward the release end, said sleeve enclosing said
sleeve; segment assembly with an annular space between the
a locking ring structure immovably mounted in the 60 exterior of said segments and the interior of said
release end opening of said body, said locking ring sleeve;
structure being formed toward the pressure end of a locking ring structure threadably received in the re-
said body with a conical surface mating with the re- lease end opening of said body, said locking ring
lease end conical surface of said segment assembly, structure being formed toward the pressure end of
and said locking ring structure being provided with 65 said body with a conical surface mating with the
release end conical surface of said segment assem-
means engaging said segment assembly to lock it bly, and said locking ring structure being provided
against r·otation within said body; with upstanding keys engaging keyways in said seg-
timing ring means enclosed within said piston sleeve ment assembly to lock it against rotation within said
between said pressure head and said threaded seg- 70 body;
ment assembly, said timing ring having a converging timing ring means enclosed within said piston sleeve
conical surface mating with and bearing on said between said pressure head and said threaded seg-
pressure end of said threaded segment assembly, said ment assembly, said timing ring having a converg-
timing ring means being spaced longitudinally away ing conical surface mating with and bearing on said
from the interior of said pressure head of said piston 75 pressure end of said threaded segment assembly, said