Abstract: The present invention relates to a security bolt understand a threaded bolt screw body (2) topped by an intermediate part (4) and a bolt head (3), joined together by weakened connections links (5, 6), the weakened connection (5) between the intermediate part and the bolt head torque being less resistant to torque than the weakened connection (6) between the intermediate part (4) and threaded body (2). A cap (8) covers the bolt head (3), the intermediate part (4) and the two weakened connections (5, 6), and is engaged in its lower region with a ring (7) positioned below the intermediate part, around the threaded body (2). The top surface of the cap (8) is formed with an lower formation (12) that cooperates with a formation (13) on the bolt head (3) to transmit rotation of the screw body. After a torque threshold, the first weakened connection (5) breaks, allowing the cap to rotate without transmitting the rotation to the screw.

Abstract: A device for the closure and sealing of envelopes and the like. First and second elongated strips of plastic material are foldable upon each other along a narrow longitudinal hinge line. The first strip has a series of locking pins distributed along its length. Each of the locking pins has a weakened base. The second strip is provided with a series of sockets adapted for receiving respective locking pins in locking relation therein. To permit the device to be opened easily when it has been applied to a plastic envelope with the locking pins penetrating orifices formed along the two borders at the mouth of the envelope, at least a part along the length of the longitudinal hinge line is weakened starting from a first end, and each strip is provided, at its first end, with an appendage capable of being held between the fingers of the user.

Abstract: A sealing system of the type in which a locking pin is received in a cavity containing a tooth that cooperates with the pin to prevent withdrawal of the pin. The object of the invention is to provide this type of seal but which is at the same time both of high security and simple to manufacture. In the system of the invention, the cavity (2) has two openings (14, 16) adjacent to each other and separated by the base 17) of the tooth (18). The cavity is otherwise totally closed and its inner wall (21), which extends to the bottom of the cavity, is curved under the base (17) of the tooth. This permits manufacture using an injection mould having a plate (39) provided with a fixed part (40) and a part (41) rotatably mounted on the fixed part to define therebetween the male mould portion for moulding a cavity with a tooth.

Abstract: Label holders used for closing and sealing bags have the disadvantage of having to be individualized (numbered) since one type of violation would be destroying the label holder to withdraw the security seal intact and then substituting it with a new label holder and re-using the seal.The label holder of this invention has two protuberances formed with rectangular openings on one portion thereof, which pass through two corresponding openings in the other portion when the label holder is closed. Two stops, one on each side of the strip of the outer surface between the two corresponding openings are provided. The security seal has a capsule and a lock interconnected by a thread, which in the sealed configuration are separated by the first protuberance, a part of the lock passing through the opening in such protuberance and a head of the lock being locked within the capsule. The part of the lock is connected to the head by weakenings.