Various embodiments of the present disclosure provide a nail with a head having an inwardly curved top surface. In one embodiment, the nail has a longitudinal axis and comprises a head, a shank, and a tip. The head includes a top portion and a bottom portion. The top portion includes an inwardly curved top surface forming a partially spherical cavity, while the bottom portion includes a radially inwardly tapered annular bottom surface. The shank is integrally connected to and extends from the bottom portion of the head. The tip is integrally connected to and extends from the shank and terminates in a free end.

The present disclosure discloses a quick tire repairing nail. The quick tire repairing nail includes a tire repairing screw made of hard materials, at the front end of the tire repairing screw is provided with a sharp portion and at the rear end of the tire repairing screw is provided with a screw head, and a surface of the screw head which is far away from the tire repairing screw is provided with a concave-convex matching structure. The tire repairing nail further includes a sealing sleeve wrapping the outside of the screw head and/or the tire repairing screw, the sealing sleeve is made of soft materials and has a taper structure with a small front end and a bigger rear end.

The present invention relates to attachment mean (1) for connecting plane components in dry construction, in particular for fixing two-dimensional construction material to a metallic substructure, having a shaft (2) on one end region of which a point (3) and on the other end region of which a head (4) are formed, a fine thread (5) being formed on the shaft (2) in order to increase extraction values of the attachment means (1), at least in regions, a number of grooves (6) being provided on the shaft (2) which extend substantially parallel to the central axis (X) of the shaft (2).

The present invention relates to attachment mean (1) for connecting plane components in dry construction, in particular for fixing two-dimensional construction material to a metallic substructure, having a shaft (2) on one end region of which a point (3) and on the other end region of which a head (4) are formed, a fine thread (5) being formed on the shaft (2) in order to increase extraction values of the attachment means (1), at least in regions, a number of grooves (6) being provided on the shaft (2) which extend substantially parallel to the central axis (X) of the shaft (2).

A fixing bolt contains: a flexible sleeve and a locking nail. The flexible sleeve is provided with an internal threaded section above a conical hole, multiple-annular protrusions, and multiple projected wings. Furthermore, the flexible sleeve defines a plurality of slits to communicate with the conical hole, and extend across the multiple annular protrusions to be joined at a central axis of the flexible sleeve, below the conical hole, so that a lower portion of the flexible sleeve is formed into a plurality of paws. The locking nail includes an external threaded section configured to be in threaded engagement with the internal threaded section of the flexible sleeve, a driving head, and a forcing section. Furthermore, the forcing section of the locking nail includes a cylindrical portion and a conical portion to facilitate expanding or retracting the paws of the flexible sleeve, thus anchoring or de-anchoring the flexible sleeve.

A fixing bolt contains: a flexible sleeve and a locking nail. The flexible sleeve is provided with an internal threaded section above a conical hole, multiple-annular protrusions, and multiple projected wings. Furthermore, the flexible sleeve defines a plurality of slits to communicate with the conical hole, and extend across the multiple annular protrusions to be joined at a central axis of the flexible sleeve, below the conical hole, so that a lower portion of the flexible sleeve is formed into a plurality of paws. The locking nail includes an external threaded section configured to be in threaded engagement with the internal threaded section of the flexible sleeve, a driving head, and a forcing section. Furthermore, the forcing section of the locking nail includes a cylindrical portion and a conical portion to facilitate expanding or retracting the paws of the flexible sleeve, thus anchoring or de-anchoring the flexible sleeve.

An improved fastener for securing a first building component to a second building component is provided. The fastener includes a head, a shank, and a tip. The shank is connected to the head and extends along a longitudinal axis to the tip. The shank includes an upper shank portion, a lower shank portion, and a transition zone. The upper shank portion is located adjacent to the head. The lower shank portion is spaced from the upper shank portion and is located adjacent to the tip. The transition zone is positioned longitudinally between the upper shank portion and the lower shank portion. The transition zone is longitudinally spaced from the head by a pre-determined distance. The pre-determined distance is associated with a thickness of the first building component such that the transition zone is aligned with a joint between the first and second building components.

An improved fastener for securing a first building component to a second building component is provided. The fastener includes a head, a shank, and a tip. The shank is connected to the head and extends along a longitudinal axis to the tip. The shank includes an upper shank portion, a lower shank portion, and a transition zone. The upper shank portion is located adjacent to the head. The lower shank portion is spaced from the upper shank portion and is located adjacent to the tip. The transition zone is positioned longitudinally between the upper shank portion and the lower shank portion. The transition zone is longitudinally spaced from the head by a pre-determined distance. The pre-determined distance is associated with a thickness of the first building component such that the transition zone is aligned with a joint between the first and second building components.

The invention relates to a connection element for interconnecting at least two workpieces, having a shaft; a connection-element head, radially protruding beyond the external side of the shaft, at the one end of the shaft; a drive configuration on the connection-element head and a front shaft end, wherein in a holding portion of the shaft that emanates from the lower side of the connection-element head at least one pair of closed annular protrusions are disposed thereon, of which at least one annular protrusion is not completely disposed in a plane that runs perpendicularly to the longitudinal axis of the shaft; and the spacings between the two annular protrusions of the pair along the circumference are of dissimilar size, or the two annular protrusions of the pair of annular protrusions are disposed so as to be mutually parallel; wherein the front end of the shaft is configured as a tapered hole-forming portion, and wherein a maximum external diameter of the hole-forming portion is between 3% and 10% smaller, in particular 5% smaller, than a maximum external diameter of the annular protrusions.

The invention relates to a connection element for interconnecting at least two workpieces, having a shaft; a connection-element head, radially protruding beyond the external side of the shaft, at the one end of the shaft; a drive configuration on the connection-element head and a front shaft end, wherein in a holding portion of the shaft that emanates from the lower side of the connection-element head at least one pair of closed annular protrusions are disposed thereon, of which at least one annular protrusion is not completely disposed in a plane that runs perpendicularly to the longitudinal axis of the shaft; and the spacings between the two annular protrusions of the pair along the circumference are of dissimilar size, or the two annular protrusions of the pair of annular protrusions are disposed so as to be mutually parallel; wherein the front end of the shaft is configured as a tapered hole-forming portion, and wherein a maximum external diameter of the hole-forming portion is between 3% and 10% smaller, in particular 5% smaller, than a maximum external diameter of the annular protrusions.