摘要:
The invention relates to a low-vulnerability explosive munitions element comprising a casing containing a multicomposition explosive charge, the innermost layer of which is a composite explosive comprising a filled polyurethane or polyester polymer matrix, the filling of which contains more than 20% by weight of organic nitrate explosive, and the peripheral layer of which is a pyrotechnic composition of the family of composite solid propellants comprising a filled polyurethane or polyester polymer matrix the filling of which contains at least one mineral oxidant and less than 17% by weight of organic nitrate explosive. The blast and/or bubble effect produced is close to that produced by the much more-vulnerable charge of monocomposition composite explosive of equivalent mass. The invention also relates to a method for obtaining a blast and/or bubble effect by releasing in the casing of an aforementioned munitions element according to the invention, and then rupture of the casing. The release of gas is obtained by detonation of the innermost layer and then reaction without detonation of the peripheral layer.
摘要:
The invention relates to a low-vulnerability explosive munitions element comprising a casing containing a multicomposition explosive charge, the innermost layer of which is a composite explosive comprising a filled polyurethane or polyester polymer matrix, the filling of which contains more than 40% by weight of organic nitrate explosive, and the peripheral layer of which is a pyrotechnic composition of the family of composite solid propellants comprising a filled polyurethane or polyester polymer matrix the filling of which contains at least one mineral oxidant and less than 10% by weight of organic nitrate explosive. The blast and/or bubble effect produced is close to that produced by the much more-vulnerable charge of monocomposition composite explosive of equivalent mass. The invention also relates to a method for obtaining a blast and/or bubble effect by releasing in the casing of an aforementioned munitions element according to the invention, and then rupture of the casing. The release of gas is obtained by detonation of the innermost layer and then reaction without detonation of the peripheral layer.
摘要:
A clamp fitting is formed by an internal segment of metal band wound upon itself, and an external segment of metal band formed about a portion of the internal segment. The internal segment extends for more than one complete circumference such that the outer end of the internal segment overlaps the internal end of the internal segment to form a continuous internal surface. The outer end of the internal segment presents an ear formed by two folds of band placed back to back and projecting radially on the outer periphery of the clamp. The external band segment extends only for a partial circumference. One end of the external segment is attached to the outer face of the internal segment. The other end of the external segment is shaped as a hook capable of hooking behind the ear to maintain the clamp in a tightened position.
摘要:
Clamp for joining two metal pipes, particularly of the type constituting the exhaust system of a vehicle engine, the ends in facing relationship of the two tubes to be joined having conical shape complementary bearing surfaces which project with respect to the cylindrical outer surface of the pipes. The clamp is constituted by an open ring of inverted V-shaped cross-section, the two ends of which ring comprise bearing elements for means provided for tightening and holding the ring in its closed position when the clamp has been placed over the pipes to be joined.
摘要:
The collar is formed by rolling up a strip (10). First fastening means formed by a hook (14) projecting radially are located at a first end (10A) of the strip, while second fastening means comprising a retaining element (12) projecting radially and suitable for constituting with said hook to close the collar are located at the second end (10B) of the strip. The free edge (14A) of the hook is suitable for being engaged beneath a rim (13) formed to project radially outside relative to the collar in the vicinity of the retaining means (12) while the retaining means are engaged beneath the hook so as to close the collar. The hook is preferably formed by an embossed projection regardless of whether or not the rim (13) is present.
摘要:
The present invention relates to a process for shrinking a ring to be shrunk, placed around an object to be clamped on a cylindrical support and behind an axial obstacle connected to said support. The process comprises the following steps of: a) fitting a shrinking tool around the support, over the axial obstacle, until its jaws in expanded position are disposed in the radial plane of the ring to be shrunk, b) positioning in the jaws, by the rear of the axial obstacle, a spacer presenting a central opening adapted to the ring to be shrunk, and c) finally, tightening the shrinking tool to bring the jaws and the spacer that they contain in their retracted positions.
摘要:
A clamp fitting is formed by a metal band wound on itself. One end of the band presents an ear radially projecting on the outer periphery of the clamp. The other end of the band is shaped as a hook capable of hooking behind the ear to maintain the clamp in a tightened position. After hooking, on the face of the metal band located opposite the hook bearing zone, the ear is provided with a member integral therewith and of which a zone is capable of coming into stop contact with the inner face of the hook when the latter is being hooked on the ear. This additional contact with the inner face of the hook prevents any relative displacement of the hook with respect to the ear and consequently any increase in the tightening of the clamp.
摘要:
A clamp fitting is disclosed, constituted by a metal band wound on itself, whose ends are respectively provided with complementary hooking means, comprising a hook capable of passing behind a shoulder or ear during the clamping operation. The clamp fitting presents at least one group of two undulations, each in the form of an open loop, projecting radially with respect to the outer periphery of the clamp fitting, the zone of join of at least one undulation to the clamp fitting being constituted by a portion of band of circular section, whose radius is at least equal to twice the thickness of the band and which extends over an arc of at least 90.degree. and preferably close to 150.degree..
摘要:
The invention relates to a clamp constituted by a band of metal comprising, at each one of its ends, complementary tightening and/or fastening means, whereas the inner end of the band comprises an extension which goes beyond the corresponding fastening means, under the outer end of the band.In this clamp, the transversal edge of the band, which constitutes the free end of the extension, has a profile indented into the band, such as an .OMEGA.-shaped profile, whereas close to its outer end, and on this side of the corresponding tightening and/or fastening means, said band comprises an elongated boss, which projects from its inner face, and is adapted to penetrate into the indented profile of the free end of the extension, said boss having its maximum height substantially equal to the thickness of the band.
摘要:
A device for coupling together in leaktight manner two smooth tubes disposed end-to-end, the device comprising a sleeve which diameter can be reduced by a tightening action, and a sealing ring (24) suitable for being disposed inside the sleeve so as to surround the ends of the two tubes. The ring is constituted by a looped flat strip (26) having two longitudinal ends (26a, 26b) suitable for coming into contact with each other when the sleeve is tightened around the tubes (20, 22). The first longitudinal end of the ring is provided with a notch (28), while the second longitudinal end of the ring is in the form of a tongue (30) suitable for being inserted into the notch. Both the width of the tongue and also the width of the notch taper in the direction going along the strip from the first longitudinal end to the second longitudinal end. When the tongue is in a partial insertion position in which it is inserted partially in the notch, the two sides (30a, 30b) of the tongue are suitable for coming into contact with the two sides (28a, 28b) of the notch while the free end (30a) of the tongue remains at a distance from the end wall (28c) of the notch, and, starting from the partial insertion position, the tongue is suitable for penetrating further into the notch under the effect of the tightening.