32results about How to "Prevent unraveling" patented technology

A gland packing is braided in a state where, in crossing angles of yarns which are exposed on four side surfaces of a string-like member, crossing angles in adjacent side surfaces of the four side surfaces are different from ch other. The string-like member is looped so that the crossing angle on the side surface in the four side surfaces, the side surface being to function as an inner circumferential surface, is larger than the crossing angles on side surfaces which are to function as side circumferential surfaces adjacent to the inner circumferential surface.

The present invention relates to a dental implant, and more particularly, to a dental implant in which a fixture and an abutment are together by a separate screw post so as to prevent the breakage of an implant screw tightening part and uniformly transmit forces over the entirety of a contact surface, to thereby prevent stresses from being partially concentrated, and in which the screw-tightening direction between the fixture and the abutment is variable so as to improve the coupling force between the fixture and the abutment and fundamentally prevent a screw from becoming loosened. The dental implant of the present invention comprises said fixture and abutment, the abutment including a lower abutment to be fitted onto the fixture, and an upper abutment connected to an upper portion of the lower abutment, the lower abutment and the upper abutment being separate from each other. The upper abutment and the fixture are coupled and fixed by the screw post.

The invention discloses a manufacture method of a single side ridge type water retaining rubber plate of an airplane tire. According to the manufacture method, one side with the water staining rubber plate is designed at a lower mold of a vulcanization mold in advance for vulcanization; an extruding opening model is designed according to the shape of the designed water retaining rubber plate and is used for extruding out a rubber strip of the water retaining rubber plate; and during the tire vulcanization, the rubber strip subjected to pretreatment is put in a groove of a lower mold to be integrally vulcanized and formed with a pretreated forming tire blank. The manufacture method mainly belongs to the method that before the vulcanization, a rubber strip semi-finished product is preset in the mold, and the forming and the fixation in the mold are realized through vulcanization. The method has the advantages that the problem that the water retaining rubber plate position generates the defects of rubber lack, tire cavity thread exposing and the like after the airplane tire vulcanization of the single side ridge type water retaining rubber plate can be effectively solved, and the product quality is improved; and the water retaining rubber plate is prevented from being thrown away in the tire use process, the number of use times can be increased by more than ten times, the service life of the tire is prolonged, and the safety performance of an airplane is improved.

Described herein is a novel method and apparatus for preventing spark propagation from a hydraulic joint (110) to a surrounding medium, such as a fuel source. The hydraulic joint (110) includes a fitting (112) and tubes (114, 116). A tip seal (122) may be placed about the edge of the hydraulic fitting (112) or a sleeve (118) may be placed about the joint (110), each resulting in an independent mechanical barrier between the joint (110) and surrounding medium, thereby preventing spark propagation to the surrounding medium.

Described herein is a novel method and apparatus for preventing spark propagation from a hydraulic joint to a surrounding medium, such as a fuel source. The hydraulic joint includes a fitting and a tube. A tip seal may be placed about the edge of the hydraulic fitting or a sleeve may be placed about the joint, each resulting in an independent mechanical barrier between the joint and surrounding medium, thereby preventing spark propagation to the surrounding medium.

The invention relates to a steel coil unfolding assistant device, which is characterized in that: two symmetrically structured mechanisms are respectively installed at the left side and the right side in front of a steel coil of an uncoiler, material retaining rolls are utilized to exert a force on the steel coil surface to control the looseness of the steel coil; each of the mechanisms has a structure that: a pedestal is fixed on the ground, a laterally shifting oil cylinder and a sliding frame are arranged on the pedestal, the laterally shifting oil cylinder drives the sliding frame to make horizontal movement; and a material retaining oil cylinder and a material retaining frame are mounted on the sliding frame, the material retaining frame is provided with a material retaining roll and a hydraulic motor, the material retaining oil cylinder pushes the material retaining frame so as to further push the material retaining roll to be retained on the external surface of the steel coil, the hydraulic motor drives the material retaining roll to rotate so as to assist coil unfolding, and the top of the material retaining frame is equipped with an approach switch for detecting and controlling the distance between the material retaining roll and the steel coil external surface. Being able to effectively prevent a steel coil scatter phenomenon and enhance the production efficiency, the assistant device has the characteristics of simple structure, low cost, easy realization of installation and operation.

The invention relates to the technical field of fire rescue, in particular to a high-rise fire self-rescue rescue device, which includes a support frame, a storage mechanism, an installation mechanism, a connection mechanism, a partition, a limit mechanism, a water storage mechanism, a lifting mechanism, a closing mechanism and The fixing mechanism, the storage mechanism is fixed on the wall through the support frame, the installation mechanism and the lifting mechanism are installed on the top of the storage mechanism, the lifting mechanism is rotated to make the rope hang down from the floor, and the connecting mechanism is installed inside the storage mechanism, and the connecting mechanism fixes the person and the rope together. Make people slide down from the rope, which is convenient for people to escape from fire; a partition is installed inside the storage mechanism, masks and other items are placed in the partition, and a water storage mechanism is installed above the partition, and the water storage mechanism is opened to make the water inside the water storage mechanism Sprinkle on the mask, wet the mask to prevent smoke and dust from entering the mouth; install a limit mechanism on the side wall of the lifting mechanism, and the limit mechanism engages with the installation mechanism to fix the lifting mechanism inside the installation mechanism to prevent the rope from being untied.

A button and button hole structure (10) is configured so that parts (24, 44) linking each of a pair of buttons (22, 42) and a section of fabric (12) on one side are positioned at the distal ends or proximal ends of a pair of button holes (32, 42) provided to a section of fabric (14) on the other side. Therefore, when the buttons (22, 42) are buttoned, it is possible to have the buttons (22, 42) move less, relative to the button holes (32, 52), than in the past, and the buttons (22, 42) can stay buttoned more stably. As a result, the buttons are less likely to come undone inadvertently, and increasing the size of the button holes (32, 42) facilitates buttoning and unbuttoning of the buttons (22, 42).