Abstract: Method of blind anchoring for mounting on plasterboard or other dry wall panels having inaccessable backs, fixtures attachable by screws or bolts, the assembly having as a blind anchor member a strong stiff elongated machinable plate, as a puller a flexible string or cord passed through a central drilling in and knotted beyond the back of the plate, and a self-sticking adhesive coating on the front of the plate. Using a flange of the fixture as a marking template, an opening, within the perimeters of the flange and any screw holes therein, is cut through the wall. Sized to fit, the anchor plate with the string attached is inserted through the wall opening and after positioning manually by fingers extended through the opening, is pulled by the string against the inside of the wall. With the plate then held in position by the adhesive and the tensile force on the string, holes are drilled in the marked positions through the anchor plate for receiving the attaching screws.

Abstract: A fastening bolt set is disclosed which is used for attaching an object to a structure, and which comprises an ordinary bolt with a hexagonal or circular head, an internal washer having a long shape and having an annular projection, an external washer having an annular projection, and an ordinary nut for final tightening, all of the above components being connected by a string. This device is used where the back side of the structure is unreachable by hand or by means of a tool, and the working method is such that the bolt and the internal washer are sequentially inserted through the fastening hole, and the string connected to the bolt and the washer is pulled out of the fastening hole. Then the head of the bolt and the internal washer are combined together, the body of the bolt is passed through the fastening hole, and the head of the bolt and the internal washer are halted at the back side of the fastening hole.

Abstract: A wedge device particularly suitable for use in mounting a swimming pool light in a niche formed in a wall of the pool has a wedge member and a drive member for use in driving the wedge member between the side of the light and the wall of the niche. The drive member is pivotally mounted on the wedge member for limited slidable freedom of motion laterally as well as rotatable motion by means of a pair of trunnions which extend therefrom and fit into cylindrical sleeve bearings formed in the wedge member. A screw member threadably engages the drive member and is inserted through an aperture in the mounting ring for the light. When the screw is tightened against the mounting ring, it draws the wedge member against a side of the light and the wall of niche thereby wedging the light in place. The drive member can be rotated ninety degrees on its trunnions to change the size of the wedge provided by the wedge member thus enabling its use under different installation requirements.

Abstract: In an installation method according to the invention, one pulls the wings of a toggle bolt into contact with the inner surface of a wall continuously during tightening of the bolt, this being in contrast with previous practice where the finger nails eventually must be removed, and thus the pulling action eliminated, in order to prevent locking of the fingernails between the wall and bolt head. An apparatus according to the invention comprises means for exerting a pull on the bolt of a toggle bolt, for maintaining the contact of the wings with the inner surface of a wall until the bolt has been tightened. The invention also provides a special manufacturing method for a particular apparatus of the invention.

Abstract: An expansible plastic fastener comprising a generally elongated body portion, a collar member, and locking means comprising a pair of reinforced toggle arms. The body portion has a generally central opening for reception of an elongated retaining element. The reinforcement provides cooperative resilient interaction with the toggle arms to assist movements toward their collapsed and expanded portions while simultaneously contributing to their holding strength. The fastener can also include a Y-shaped reinforcing portion pivotally connected to the locking means of the body portion by flexible connector means. This Y-shaped portion may include means for engaging an elongated retaining element in the form of a threaded member. Also, a fastening kit comprising a fastener of the invention along with a key for expanding the locking means to its optimum expanded position or a fastener of the invention with an elongated retaining element.

Abstract: An expansion dowel assembly includes a sleeve-like support bearing incorporating load engagement surfaces, and annular disks displaceably held on the support bearing by a tension member for displacement between a radially inwardly displaced position and a radially outwardly displaced position. The annular disks are formed of a spring-like material. The tension member clamps the disks in the radially inwardly displaced position in the form of a hollow cone. When the clamping force on the disks is removed, because of their spring-like characteristic, they move into the radially outwardly displaced position flattened out from the hollow cone configuration. A load can be applied to the support bearing at the load engagement surfaces.

Abstract: A device for detachable and repeatable accurate clamping in X-, Y- and Z-directions of a first object to a second object like a working table (2) to a machine table (1), the first object (1) having a house (3) with a truncated conical surface (15) intended to cooperate with a corresponding conical surface (25) of the second object (2) and clamping member (9), each intended when clamping the second object to the first object by pivoting the clamping member to engage a clamping surface (20) of the second object by a nose (12). According to the invention the house (3) is provided with a first stop face (17) extending across the axis (16) of the truncated conical surface (15) and cooperating with a second stop face (21) arranged in the second object, the mutual position in the Z-direction of the first and second objects being unambiguously determined.

Abstract: A fastener assembly for connecting lightweight roofing structure laminations is shown. The assembly comprises a toggle bolt with an unremovable toggle nut on the lower end of the toggle bolt stem, securing the lower surface of the lamination, and a flanged cap nut threaded on the toggle stem's upper end which secures the lamination's upper surface. The flange cap nut is fitted with a recess complementary to, and adapted to receive a keeper nut fitted with a recess which allows torquing of the flanged cap nut. The keeper nut is also adapted to connect with the top end of the toggle bolt stem in a way, that locks the flanged cap nut and toggle stem together so that the same are incapable of independent rotation, thus preventing the loosening of the fastener assembly.

Abstract: Removable anchors provide for the stabilization and securing of perforated panel hangers, on a semi-permanent basis, through the use of a formed semi-rigid anchor member inserted into one or more apertures of a perforated support panel, embracing at least a portion of the body or shank of at least one hanger and includes at least one end portion designed with one or more deformable barbs to which pull tab members are attached. After being inserted through the aperture of the perforated panel, without special tools, anchor barbs return to original shape locking behind the panel, the pull tab member extending through panel aperture to remain in front of perforated panel. When hanger removal is desired, pull tab elements attached to the anchor barbs are pulled and latched from the front of the perforated panel, causing the compacting of the anchor barb portions, they fold against the anchor body allowing anchor to exit through the panel perforation.

Abstract: An improved fastening element for securement within an opening and of the type comprising (a) a head portion; (b) a connecting portion comprising a longitudinally extending body portion including a pair of opposed pillar-like parts, for insertion into such opening; and (c) at the end of said connecting portion remote from the head portion, locking means movable between a collapsed position in which the fastening element is insertable into the opening and an expanded position in which the locking means is effective in cooperation with an elongated retaining element inserted into the connecting portion to preclude removal of the fastening element from the opening.

Abstract: A fully articulable positioning device for positioning an elongated member comprising a pair of legs hingeably attached to the elongated member at one end of the legs and a slideable connection at the opposite end of the legs. The slideable connection is of the pin and slot variety wherein each leg contains a pin and slot for communication with the slot and pin of the other leg. The leg may be of any length suitable for their intended use and may be improved by the addition of handle-like projections at the slideably connected end.

Abstract: A releasable locking device comprises a tubular housing (180) having a pair of rotary pawls (182) mounted therein. The angular position of the pawls are controlled by spring-loaded balls (183). A line (179) passing through the housing has a collar (184) thereon which latches with the pawls when the collar is brought into engagement therewith, the pawls being rotated so that the balls then bear on adjoining surfaces of the pawls. When the line is subsequently slackened the balls (183) act on the pawls to rotate them further into the housing so that on subsequent engagement by the collar (184), they are free to rotate so as to allow the collar to pass through the housing. This system provides an automatic latching of the line (179) followed by automatic disengagement of the latch simply by releasing tension in the line followed by reapplying such tension. Therefore latching and unlatching can be effected simply from a position remote from the latching mechanism.

Abstract: Improved apparatus is provided for temporarily securing together scaffolding members. A slotted stud fixed to a scaffolding support member is provided with a pivotal dog rotatable within the slot for receiving the hole punched end of a cross member. A spring and washer having a transverse bar member within the slot are permanently retained on the stud to prevent misuse of the device. Rotation of the dog to receive the cross member causes axial movement to the washer and compression of the spring. Further compression of the spring by the cross member allows the dog to return to its lock position by gravity. The spring, washer, and dog thus cooperate to either expel the cross member from the device or lock the cross member in place, which substantially increases scaffolding safety.

Abstract: The disclosure relates to an expanding plug intended for closing a cylindrical aperture provided in a wall and accessible from only one side. In one embodiment, the plug comprises a base which is applied against the front face of the wall, at least two gripping members which are inserted into the aperture with their ends protruding on the other side of the aperture, which are provided with an outwardly extending radial shoulder, and which are mounted for sliding in corresponding recesses provided in a central member, permitting their radial displacement through a pivoting displacement effected in the plane of the radial recesses, a screw control into the central member in order to effect simultaneously their radial displacement towards the outside and their longitudinal displacement in the direction of the rear face of the wall until the shoulders of the gripping members are applied against the rear face of the wall.

Abstract: Expansion dowels for use in slabs, masonry and similar structural components having a face surface and a hollow space inwardly of the face surface so that the dowel can be inserted through the face surface into the hollow space. The dowel has a shaft part which extends through the face surface into the hollow space. Expansion arms are flexibly articulated to the shaft part and are located in the hollow space when the dowel is inserted. Support levers are flexibly articulated to the expansion arms and are interconnected by a link. The support levers are also located within the hollow space when the dowel is fully inserted. The expansion arms and support levers can be angularly displaced between an insert position so that the dowel can be inserted into the hollow space and an expansion position for holding the dowel in the inserted position. Releasable stops are provided for securing the expansion arms and support levers in the insert position.

Abstract: A retrievable toggle bolt assembly characterized by a cup for receiving the hinged toggle elements as the bolt is unscrewed from a wall or ceiling panel. The cup is formed to provide indication as to complete attachment of the bolt to a cap carried thereon.

Abstract: The one legged fastener is for securing an object to a wall. The one legged fastener has a body with one leg which has a prebent knee that permits the leg to be easily inserted through a desired hole in the wall. The fastener body is made of a bendable material and has a tab portion and a foot portion at the opposite ends of the leg. The tab has a hole in alignment with a threaded hole in the foot portion. By placing a screw through the tab portion hole and turning it through the threaded hole in the foot, the one legged fastener bends at the knee and is secured to the wall to secure an object.

Abstract: An improved anchor assembly for retaining an elongated fastener member within an opening defined by a wall portion having at least one concealed side. Such devices typically comprise at least two elongated leg members, means for connecting a pair of adjacent end portions of the leg members, an apertured anchor member coupled to the legs at opposite end portions and a collar member secured to the legs for sandwiching the wall portion between the collar and the anchor member. The improvement comprises providing each of the legs with respective coupling studs aligned along their major transverse dimensions for engaging substantially longitudinal flanges from anchor member on either side thereof or attaching the legs across the minor dimension of the anchor.