A torque-limiting fastener and a method of assembling the same includes a drive shell, a driven fastener carried by the drive shell, and a clutch axially between the fastener and the drive shell. The drive shell may have a shell base wall including drive-off surfaces, drive-on surfaces, and a shell skirt extending axially away from the shell base wall. The driven fastener may have a fastener base wall including driven-on surfaces, driven-off surfaces, drive tang pockets between the driven-on and driven-off surfaces, and driven-on beam pockets, and a radially outer wall extending in an axial direction away from the fastener base wall. The clutch may have a plate, a driven beam, and a driven tang, wherein the driven beam and the drive tang are cantilevered with respect to the plate. A drive shell, driven fastener, and clutch are individually disclosed.

A rotary fastening device includes a rotating axial member and an inertia member. The rotating axial member includes a base body, an input end, an output end and an engaging portion. The input end is disposed at one end of the base body and selectively connected to a wrench. The output end is disposed at the other end of the base body. The engaging portion is disposed on the base body. The inertia member is detachably connected to the rotating axial member, and includes a gravity portion and an engaging hole. The gravity portion is extended toward the output end of the rotating axial member so as to form an annular space. The engaging hole is communicated to the annular space.

A fittable and releasable fastener includes a head which has a fitted and released portion and a fastening portion; and a fitting and releasing piece which has a fitting and releasing portion. Accordingly, when the fitting and releasing portion fits to the fitted and released portion, an external turning force is applied to the fitting and releasing piece or the head to make the fastening portion combine with at least one object. After the fastening portion is combined with the object, the fitting and releasing portion would release the fitted and released portion to limit the force or the force interval applied on the fastening portion for preventing excessively locking if the force is continuously applied.

A compound screw is a two-piece assembly where the head of the screw can rotate in the tightening direction to a designed tightening torque to drive the screw while being able to positively counter-rotate in the loosening direction. The screw assembly comprises a screw and a cap surrounding the head of the screw. The screw has a head at the top and a threaded shank downwardly extending from a base of the screw head. The screw is turned by turning the cap about a central axis of the screw. The cap is rotatably affixed to the screw head by a loose riveting of the cap to the top most end of the screw head by flaring a thin-walled upwardly extending portion thereof. The cap includes a plurality of axially extending peripheral resilient arms which engage peripheral cam surfaces around the outside of the screw head.

Inexperienced users of conventional self-drilling drywall anchors may apply too much torque to its screw drive, even after the anchor has become fully bedded down in the drywall, under the mistaken impression that applying a greater torque will improve security of the anchor within the drywall. However, continuing to rotate the anchor after it has been fully inserted into the dry wall continues to rotate the anchor within the drywall and gouges out drywall material from around the anchor. Such gouging causes a cavity to form around the anchor, reducing its security within the wall. The present invention provides a self-drilling drywall anchor having a screw drive 16 that comprises a clutch configured to limit an amount of torque transmitted to the shank 5 by a tool engaged with the screw drive 16. In this way, a user may drive the anchor into a drywall, but over-tightening is prevented as the clutch limits the amount of torque transmitted to the shank 5, thereby preventing the external threads 7 on the shank from gouging out drywall material adjacent to the anchor and reducing the anchor's security within the drywall.

Button comprising a nut (1), a support (3) and a cover (5) fitted on the aforesaid support (3) defining a chamber (6) and having at least one window (51, 52) for an indicator for at least one position chosen from a first position for the button roughly corresponding to a minimum tightening torque for the nut (1) and a second position for the button corresponding to a lower tightening torque than the tightening torque for the first position, with the aforesaid indicator (30) being connected to a plate (13) by a tube element (131) which ensures that a rotation of the plate (13) is translated into a rotation of the indicator (30).

A circuit interrupting device for use with a electrical power distribution system includes a housing containing a circuit interrupting mechanism. A battery tube is positioned in the housing. A battery assembly is configured to be inserted into the battery tube. The battery assembly includes a battery assembly body having a first end and a second end. A battery is positioned in the battery assembly body. The battery assembly is configured such that both a positive contact and a negative contact are exposed from the second end of the battery assembly body. In some embodiments, the battery assembly includes a keyed portion mates with the battery tube to ensure alignment of the battery assembly in the battery tube.

A circuit interrupting device for use with an electrical power distribution system includes a housing containing a circuit interrupting device. A battery tube is positioned in the housing. A battery assembly is configured to be inserted into the battery tube. The battery assembly includes a assembly body having a first end and a second end. A battery is positioned in the assembly body. A cap assembly is connected to the assembly body and configured to connect the battery assembly to the battery tube. The cap assembly includes a torque-limiting device that prevents overtightening of the cap to the battery tube.

A torque limiting device (30) connectable to a load carrier, such as a load carrier foot (10), and adapted for indicating a torque imparted by a user, the torque limiting device (30) comprising a torque limiter (50), a connection member (31) adapted to be connected to the load carrier foot (10) and a head portion (40) arranged on the connection member (31), the head portion (40) comprising a first and a second member (41, 42). The disclosure also relates to a load carrier foot (10) comprising the torque limiting device (30). The torque limiting device (30) is specifically adapted to be user friendly and has a space saving configuration.

An expansion bolt including an anchor bolt having an expansion section, and further including an expansion sleeve which surrounds the anchor bolt and which can be expanded by retracting the expansion section, and a spring element arranged on the anchor bolt. The spring element can be tensioned by inserting the anchor bolt into a bore hole and can retract the expansion section of the anchor bolt into the expansion sleeve when it is released. An indicator element indicates when a rated tension of the spring element is reached.