1263results about How to "Prevent twisting" patented technology

A wire arrangement body includes: a wire arrangement groove portion of a tank shape that has a bottom wall portion and both side wall portions; a lid portion that is rotatably connected to one side wall portion of the wire arrangement groove portion through a hinge and covers the wire arrangement groove portion so as to seal a groove opening of the wire arrangement groove portion; and an engagement portion that causes the lid portion to engage with the other side wall portion of the wire arrangement groove portion when the lid portion covers the wire arrangement groove portion. The wire arrangement body is provided so that a center position of the hinge and a center position of the engagement portion are aligned in parallel with a width direction of the wire arrangement body.

An article of jewelry comprising plates having indicia embossed or engraved thereon mounted on a shoelace type cord. The ends of the cord have rigid rectangular aglets and are threaded through rectangular holes at opposed ends of the plates. The generally flat cord cannot twist or fold within the rectangular holes in the plates so the plates always maintain the same orientation and position on the cord, allowing them to be arranged and displayed sequentially. The article of jewelry can be tied to itself using one hand because the cord is provided with a rectangular button hole of the same size as the rectangular holes in the plates. The rigid rectangular aglet is passed through the button hole, under the cord and back through the created loop and pulled tight, thereby tying the cord to itself using only one hand.

The invention provides a high-reliability high-stability multi-rotor-wing unmanned aerial vehicle with a quick-dismounting function. In order to quickly dismount the unmanned aerial vehicle, the central disc and arms of the unmanned aerial vehicle are split, fan-shaped plates with central angles of more than 180 degrees are arranged on the end surfaces of arm inner parts in arm connecting structures to serve as first limiting convex grooves, fan-shaped plates with central angles of less than 180 degrees are arranged on the end surfaces of central disc inner parts in the arm connecting structures to serve as second limiting convex grooves, and each first limiting convex groove and each second limiting convex groove are clamped together to form a round plate anti-twist structure; meanwhile, in order to prevent twisting of each anti-twist structure, two column positions are added in each connecting structure to reinforce the anti-twist effect, and the arm inner parts are integrally and fixedly connected with the central disc inner parts through thread suites on the outer sides of the formed anti-twist structures, so that the firmness of the unmanned aerial vehicle during flight is guaranteed and the anti-twist function of the arms is improved. The unmanned aerial vehicle has the advantages of simple structure, and has the advantages of quickness for dismounting and convenience for connecting and mounting; especially, the firmness and rigidity of connection are guaranteed, and the flight reliability and stability of the unmanned aerial vehicle are greatly improved.

A deployable reflectarray antenna includes a plurality of reflectarray antenna panels each having one edge connected to be folded and unfolded. Each reflectarray antenna panel includes a membrane having reflecting elements and a support frame. The support frame includes outer frames surrounding edges of the membrane, and a plurality of reinforcing members disposed in a vertical direction between the outer frames in a length direction.

A conversion mechanism 5 consists of a ball screw shaft 21, a ball nut 22, etc. The ball nut 22 is connected to a spool 7 via an arm member 6, a range control shaft 34 and a detent lever 40. A motor 40 is used for moving the spool 7 to a predetermined switching region of a plurality of switching regions via the conversion mechanism 5 and the arm member 6. Then, the detent mechanism 9 is used for further moving the spool 7 to a switching position to position and hold it. To provide a range switching device simply constructed and controlled to accurately change over a travel range.