An optimized thread profile (140) for joining composite materials is presented. This thread profile (140) maintains a certain material strength when used as part of a composite threaded joint (101). The thread profile (140) comprises a repeating pattern of four components: a crest region (150), a first flank (162), a root region (170) and a second flank (164). The thread profile (140) is symmetrical, that is, the dimensions of the four components do not change throughout the length of the thread profile. The crest (152) has a flat profile and the root (172) has a rounded profile. When a shaft (120) is affixed to a joining shaft (110) using this optimized thread profile (140), the flat profiles of the crest (152) of the shaft (120) and corresponding rounded profiles of the root (172) of the joining shaft (110) create a gap to accommodate a substance such as an adhesive or a lubricant. Similarly, the flat profiles of the crest (152) of the joining shaft (110) and corresponding rounded profiles of the root (172) of the shaft (120) create a gap to accommodate a substance.

A fastener structure includes a fastener having a stem portion and at least one movement portion. The stem portion has a fastening section. The movement portion is formed on the stem portion and has a retaining section. With these arrangements, the retaining section of the movement portion can be detachably assembled to a first object and the fastening section can be then detachably assembled or fastened to a second object. In this way, at least two objects can be connected to and disconnected from one another in a quick and repeatable manner.

An extendible protective element (10) for use in a child safety seat is disclosed. The extendible protective element comprises a first thread component comprising a first external thread and a first internal thread, and a second thread component comprising a second external thread, wherein the first thread component is rotatably connected to the second thread component via the first internal thread of the first thread component and the second external thread of the second thread component.

A fastener structure includes a fastener having a stem portion and at least one movement portion. The stem portion has a fastening section. The movement portion is formed on the stem portion and has a retaining section. With these arrangements, the retaining section of the movement portion can be detachably assembled to a first object and the fastening section can be then detachably assembled or fastened to a second object. In this way, at least two objects can be connected to and disconnected from one another in a quick and repeatable manner.

A fastener comprising a polymer composition [composition (C)] comprising at least one polyaryletherketone polymer [(PAEK) polymer], and at least one nitride (NI) of an element having an electronegativity (ε) of from 1.3 to 2.5, as listed in <<Handbook of Chemistry and Physics>>, CRC Press, 64.sup.th edition, pages B-65 to B-158, based on the total weight of the composition (C).

The invention relates to a method for producing a threaded bolt. A blank is introduced into a threaded-bolt negative mold. The blank has a bolt-shaped portion. Fibers which are aligned in the longitudinal direction of the bolt-shaped portion are embedded in a plastics material in the blank. Pressure is exerted on the blank in order to deform the blank in the negative mold such that a threaded structure is formed on a circumferential face of the bolt-shaped portion. The invention moreover relates to a threaded bolt which is manufacturable by this method, and to a system which is conceived for carrying out the method. Lightweight and hard-wearing threaded bolts may be manufactured by the method according to the invention.

A fastener system for ignition prevention triggered by a lightning strike. The fastener has a fastener body and a fastener head, and a fastening member configured to be mounted on a portion of the fastener body, wherein the fastener and the fastening member are configured to fasten at least a first part and a second part between the fastener head and the fastening member, and the fastener comprises an electrically insulating material. A structure comprises the fastener system, the first part that faces an outside from where the lightning strike may hit the first part and the second part.

A ceramic fastener assembly for high temperatures. One embodiment is a fastener assembly that includes a ceramic fastener configured to engage a hole of a structure. The ceramic fastener includes a head and a non-threaded shank including one or more indentations around its perimeter. The fastener assembly also includes a sleeve configured to slide over the non-threaded shank of the ceramic fastener. The sleeve includes a hollow cylindrical body, an exterior surface with threads, and an interior surface with one or more protrusions configured to mate with the one or more indentations of the non-threaded shank. The fastener assembly further includes a nut configured to engage the threads of the sleeve to tighten the one or more protrusions with the one or more indentations of the non-threaded shank. The fastener assembly also includes a thermal spacer configured to thermally isolate the nut and the sleeve from the structure.

A tolerance compensation device includes a base device having a tubular fastening portion that includes an internal, right-hand thread for receiving a screw-like fastening element. A tubular connecting portion, for connecting to a compensation structure, has an outer jacket wall that includes an external thread for connecting to a compensation structure, and a compensation structure having a flange-like setting element. An inner jacket wall of the setting element includes a threading configured to correspond to the external thread, and a socket-like anti-rotation element is disposed in a through-opening of the setting element, and an outer jacket wall of the anti-rotation element is connected to an inner jacket wall of the tubular connecting portion in a non-rotatable manner. The compensation structure is configured for presetting a distance in axial direction between the base device and a contact wall of the compensation structure extending orthogonally to the axial direction.

A method for molding amorphous polyether ether ketone including steps of preparing a molten mass including polyether ether ketone, cooling a mold assembly to a temperature of at most about 200° F., and injecting the molten mass into the cooled mold assembly.