Abstract: An anchor for boards is provide which comprises a socket including a tubular portion, a plurality of split pieces integral with the tubular portion and having intermediate portions slightly bent outwardly, the socket being integrally provided with a flange at one end thereof and a nut member at the other end thereof, and a screw inserted into the socket and threaded into the nut member. The split pieces have their outer peripheral surfaces covered with a resilient member. Also, a method for manufacturing the anchor is provided.

Abstract: A method for manufacturing a nail efficiently at low cost without a loss of material. The nail includes two legs bound together by a washer. One of the legs has a protrusion such that when the other leg is driven, it will spread by riding on the protrusion. In this method, a round rod stock is pressed except a portion thereof to form a head at one thereof, a trunk portion having a semicircular section with a flat surface between the head and the portion, and a tip portion at the other end of the rod stock. The portion forms the protrusion. The one of the legs is thus formed. The protrusion may be formed by pressing the rod from both sides.

Abstract: An anchor for boards is provided which comprises a socket including a tubular portion, a plurality of split pieces integral with the tubular portion and having their intermediate portion slightly bent outwardly, the socket being integrally provided with a flange at one end thereof and a nut member at the other end thereof, and a screw inserted into the socket and threaded into the nut member. The split pieces have their outer peripheral surfaces covered with a resilient member. Also, a method for manufacturing the anchor is provided.

Abstract: A coupling tool for a double wall is proposed which makes it possible to join an inner and an outer wall together without selecting places while ensuring a sufficient joint strength. The coupling tool is formed by an anchor formed by superposing two metallic plates so as to be spreadable, and a wire of a required length mounted to one end of the anchor. The wire is fixed to the anchor so as to protrude from an end opposite to the tip of the anchor. Since the anchor can be driven into the inner wall at any position, the outer wall can be fixed to the inner wall by use of the coupling tool without selecting places and number.

Abstract: A method for manufacturing a nail efficiently at low cost without a loss of material. The nail includes two legs bound together by a washer. One of the legs has a protrusion such that when the other leg is driven, it will spread by riding on the protrusion. In this method, a round rod stock is pressed except a portion thereof to form a head at one thereof, a trunk portion having a semicircular section with a flat surface between the head and the portion, and a tip portion at the other end of the rod stock. The portion forms the protrusion. The one of the legs is thus formed. The protrusion may be formed by pressing the rod from both sides.

Abstract: A plate-shaped fastener is driven obliquely into a wall member. When driving is complete, a member is superposed on the wall member, and a screw inserted through the member is threaded into the wall member. When the screw penetrates through the wall, it is threaded into the plate-shaped fastener. When the screw is tightened, the portion of the plate-shaped fastener protruding to the back of the wall is pulled against the back of the wall member, so that this portion of the plate-shaped fastener is bent and superposed on the back of the wall member. Thus, the member is securely fastened to the wall member with the wall member sandwiched between the member and the plate-shaped fastener. Also, a jig for driving the plate-shaped fastener is proposed which comprises a plate holder portion and a positioning plate portion.

Abstract: An anchor has a hollow shank having a head at one end and an integral blade portion at the other end and formed with male threads on the outer periphery. Cuts are formed in a peripheral wall of the hollow shank to define therebetween a bendable portion adapted to bend when pushed out by a mounting screw driven into the hollow shank. The blade portion is substantially semicylindrical with side edges defining cutting edges. Ribs for inclining the mounting screw are formed on the inner surfaces of the blade portion and the hollow shaft, respectively. When a mounting screw is driven through the article into the anchor to fix an article to the board, the mounting screw is inclined relative to the anchor, so that the bendable portion is pushed out, thus preventing the anchor from rotating together with the screw.

Abstract: There is a provided screw fixing plug wherein a head portion pritruding outwardly from an outer circumference of a trunk is integrally formed at one end pf the trunk. An opening into which a screw can be inserted is formed in the head, wherein the trunk is split in half along its axial direction into two legs portions, and wherein surfaces of the leg portions are inclined surfaces extending outwardly. By inserting the screw fixing plug into a starting hole of concrete or mortar and threading a screw into the screw fixing plug, an instrument or a untensil can be tightened to the concrete or mortar.

Abstract: A plate-shaped fastener is used to secure a member or an instrument to a wall of plasterboard so constructed as to be not accessible to its back. A driving portion with a pointed tip and an extension are integrally formed from a single bendable thin metal plate. A cut is formed in the thin metal plate to form the driving portion and the extension. The driving portion is driven into the wall and pulled back against one side of the wall and the extension is bent and pressed against the other side of the wall to sandwich the wall between the driving portion and the extension. A screw is then driven through the member, extension, wall and the driving portion to secure the member to the wall.

Abstract: A method of safely hanging and moving an ALC block can be carried out at a construction site at a low cost. Holes are formed in the top surface of an ALC block. Starting holes are formed, with anchor being in the bottoms of the respective holes. Anchors are formed each made up of three metallic plates superposed one on another and having a first and a second end. The metallic plates are joined together at the first end. Each anchor has a hole at the first end. The anchors are driven into the respective starting holes and into the ALC block with the second end first while spreading apart the outer metallic plates so that the anchors will not be easily pulled out. The hanger tools are engaged in the holes formed in the anchors to hang and move the ALC block.

Abstract: A screw fixing plug which makes it possible for a screw to be fastened in position with its threads biting into the trunk of the plug over the entire length thereof, irrespective of the material of the member to which a screw is fastened is made. The plug has a trunk formed with a screw inserting bore and a composite hole comprising a sector portion and a groove-shaped portion. The trunk has two rib portions defined on both sides of the groove-shaped portion. When a screw is driven into the plug with the plug inserted in a starting hole formed through an article to be fastened and a building material, the portion of the trunk where the composite hole is formed is expanded uniformly. Thus, the threads on the screw will bite the trunk over the entire length thereof irrespective of the kind of building material, so that the screw can be fastened securely.

Abstract: A nail with spreadable legs has legs that can be spread apart by a constant angle irrespective of the hardness of the ALC material into which the nail is driven. The nail has two leg members bound together by a washer with their flat sides abutting each other. One of the leg members has a protrusion on its respective flat surface near its tip. A projection and a recess are formed on the flat surfaces of the respective leg members. With the leg members bound by the washer, the projection engages in the recess near the washer. When the nail is driven in to a predetermined depth, the projection disengages from the recess, so that the legs begin to spread apart. It is thus possible to control the spread angle of the leg members.

Abstract: A screw fastener helps secure a tapping screw easily and strongly to a wall. A starting hole is formed in a wall. The trunk of the screw fastener is inserted into the starting hole. The trunk has such a shape that it comes into contact with the inner surface of the wall defining the starting hole. A tapping screw is driven into the screw fastener thus inserted in the starting hole. The threads on the screw will bite into both the wall and the trunk so that the screw will be rigidly fastened to the wall.

Abstract: Long and short legs have heads and pointed tips, respectively. They are joined together near their tips by welding. An upper portion above the welded portion of the long leg is formed with a cut extending obliquely upwards toward the short leg so that a thin breakable portion is formed in the long leg between the end of the cut and the contact surface with the short leg. A washer for clamping the legs above the cut is provided. When the nail is driven, the legs will not spread until the head of the short leg abuts the washer. When the head abuts the washer, the long leg slides outwards and spreads apart from the short leg near the cut. The breakable portion will thus get broken and the nail will spread.

Abstract: A tapping screw has a threaded shaft and a stepped drill bit portion including two or more drill portions having different diameters gradually decreasing toward the tip of the screw. The small-diameter drill portion has a larger drill angle than the large-diameter drill portion. The former firstly forms a starting hole and the latter expands it. Thus, less force is required to rotate the screw than a conventional tapping screw. Recesses are provided in the drill bit portion and have respective sides defined by cutting edges extending across only the portion of the thread closest to the tip of the tapping screw.

Abstract: A tape for holding nails has a side wall and upper and lower walls extending from both longitudinal edges of the side wall to the same side. The upper wall is formed with notches which open to the longitudinal side edge of the upper wall to hold nail shanks at their upper part near their heads. A fold-back wall is integral with the lower wall and folded back so as to oppose the top surface of the lower wall. The lower wall and the fold-back wall are formed with notches which open to the fold-back edge between the lower wall and the fold-back wall to hold the nail shanks at the lower part neat their tips. Instead of providing the fold-back wall, the top surface of the lower wall may be partially thickened at least at inner end portions of the notches.