Abstract: A nail structure comprises a wall nail casing and a hammer nail capable of being beaten into the wall nail casing. A plurality of semi-round strips are axially installed on the through hole of the wall nail casing. Each strip is reduced from an opening of the central axial hole to the middle section of the wall nail casing for firmly securing the hammer nail. The hammer nail is positioned to an opening of the wall nail casing and resists against the strips. Thereby, the hammer nail is loosely fixed to the strips. The hammer nail is sold with a matched wall nail casing. When using, the hammer nail is not necessary to be detached from the wall nail casing so that the user can beat the hammer nail directly with the wall nail casing.

Abstract: A nail structure comprises a wall nail casing a center of the wall nail casing being formed with a tapered central axial hole which is reduced toward a distal end thereof; two sides of the distal end of the wall nail casing being formed with respective slots; and one end of the central axial hole being an through opening and another end thereof being an inlet; a hammer nail capable of inserting into the central axial hole; and a plurality of semi-round enhancing ribs are on an inner surface of the central axial hole of the wall nail casing; a front end of each enhancing rib being reduced toward one inlet of the central axial hole for receiving the hammer nail easily.

Abstract: A nail structure has a wall nail casing and a hammer nail. The center of the wall nail casing is formed with a tapered central axial hole. In manufacturing the wall nail casing, an interior and a distal end of a mold for forming the wall nail casing are installed coaxial pins. When the wall nail casing is formed, two ends of the nail body are supported by coaxial pins; and thus the central axial hole will not shift. When the wall nail casing is formed, the distal end thereof is exactly formed with a though hole which is communicated with the central axial hole. When the hammer nail is beaten into the central axial hole of the wall nail casing, the hammer nail expands the central axial hole outwards to prevent the hammer nail from colliding the distal end of the wall nail casing.

Abstract: A door lock, comprising a bolt assembly movably retained by a stop member in a slideway inside a lock case, which stop member is retained by a torsional spring and confined by an adjusting screw for rotation through a fixed angle. Loosening the adjusting screw causes the bolt assembly to be released from the stop member permitting it to be changed upside down. The bolt assembly comprises a sector-like bolt detechably secured to a bolt holder by a screw. The sector-like bolt can be inverted and then reattached to the bolt holder.