Abstract: A safety plug for use in rock drilling operations. The safety plug includes a base part and one or more expander elements. The base part has a leading end and a trailing end and a generally cylindrical outer surface between the leading and trailing ends, on which one or more external spirals are formed. The external spirals are provided to engage the internal wall of a bore within which the safety plug is inserted to anchor the base part within the bore. The one or more expander elements have an inactive non-expanded condition and an active, laterally expanded condition. The safety plug is operable to absorb load applied to its leading end in two stages, whereby: in a first stage, load applied to the leading end of the one or more expander elements up to a predetermined load is transferred to the base part and the base part is operable to react the load by engagement of the spirals with the internal wall of the bore.

Abstract: An anchor bolt assembly having a generally cylindrical grip end spaced from an actuating end. The grip end has two relatively movable mating portions each having at least one complementary ramp surface. The actuating end is used to move a movable mating portion relative to a fixed mating portion in a longitudinal direction. Actuation will cause the movable mating portion to slide relative to the static mating portion and apply radial pressure at the grip end of the anchor bolt assembly remote from the actuating end. The grip end has a roughened surface on the static mating portion while the movable mating portion is smooth. The anchor bolt assembly is particularly suitable for use in tapered holes formed in concrete.

Abstract: A tube connecting assembly comprises at least one first tube; a plurality of inner liners; a periphery of each inner liner having a tapered shape; an inner periphery of each inner liner being formed with a convex portion; each inner liner enclosing a periphery of the first tube; at least one connecting structure each being formed by an assembly unit and a locking unit; the assembly unit assembled to an periphery of the first tube; the tightening unit being formed by a first tightening unit, a second tightening unit and a locking unit; each of the first tightening unit and second tightening unit has a respective inclined surface; at least one second tube enclosing the tightening unit; by screwing the locking unit, the first tightening unit and second tightening unit will engage at different orientations. The tube connecting assembly can be assembled and detached easily and conveniently.

Abstract: Fastening systems for parts that endure high vibration shear loads have traditionally been difficult or expensive to produce. This application describes a fastening system with multiple conical surfaces and eccentric offsets. The novel conical fastener system allows parts to be assembled with reduced tolerance controls at interface features while improving alignment precision. The eccentric conical fastening system is particularly well suited for assemblies with high shear loads in high vibration/shock environments, and/or for systems that have extremely precise pointing requirements.

Abstract: The invention provides an installation tool for use with a battery operated drill or a corded electric drill for repetitive installation of caulk-in anchors. The installation tool utilizes the mechanical advantage of a threaded shaft to improve consistency of the holding reliability of the caulk-in anchor and controls the anchor setting process to insure proper installation while reducing installation time. The installation tool does not rely on bottom setting or a hammer strike to set the anchor, but can be set at a depth independent of hole depth. In one embodiment, the tool can be used with a through hole in the substrate and uses a combination of a threaded shaft and a controlled sensing spring to insure a more uniform installation of the anchor within the substrate across the entire length of the sleeve portion of the anchor, along with a visual check of proper setting of the anchor.

Abstract: A fastening element has a shaft having a rear end and a forward end with a forward end face, holding means arranged at the rear end of the body for fastening an article to a building component, means forming an expansible region starting from the forward end face and extending in a longitudinal direction through a portion of a length of the shaft, the means forming the expansible region including a longitudinal slot having a base and an expansible member seated displaceably on the base of the longitudinal slot, the expansible member being provided with a stop which abuts the forward end face of the shaft.

Abstract: A latch mechanism for retaining a sunroof closure panel in a vehicle body roof opening includes a pin projecting from the closure panel and received within a bore of a receptacle mounted on the vehicle body. The pin is bifurcated by a central slot defining a pair of legs. A latch lever is pivoted within a transverse bore in the receptacle and carries a cam member which is received within the slot of the pin and straddled by the legs when the closure panel is lowered into its closed position. Rotation of the latch lever and the cam member forcibly spreads the pin legs into engagement with the bore of the receptacle to latch the sunroof closure panel in the closed position. The pin slot and the cam member may have mating tapers by which an adjustment of the transverse position of the cam member will adjust the extent of forcible spread of the legs to adjust for wear and for manufacturing or assembly variations.

Abstract: An expansion dowel assembly is formed of an axially extending dowel body and an expansion member. The dowel body has a support surface inclined relative to the axis of the dowel body along which the expansion member can be displaced for anchoring the dowel assembly in an opening such as a borehole. At least a portion of the support surface is in the form of a groove extending in the axial direction of the dowel body and the bottom of the groove is inclined so that the expansion member is forced radially outwardly away from the axis of the dowel body as it is displaced through the groove.

Abstract: A bolt-like fixing assembly for use in improving the strength and/or stability characteristics of rock structure, such as for reinforcing rocks, includes an elongate structure one end of which is adapted to be fixed within a bore formed in a rock and a device for fixing the other end of the elongate structure to the surface of the rock. According to aspects of the invention, the elongate structure is constituted of at least two rod-like members and a fixing device of the elongate structure is constituted by a wedge-shaped member and a bearing plate, such as a washer. The elongate structure is preferably constituted of three rod-like members, each of which preferably is constituted of a bulb steel rod.

Abstract: Structure for combining an attaching member of integrally constituted engaging body to a receiving member having a rectangular attaching hole through a clip, wherein the device comprises said engaging body which includes a pair of supporting plates which project at both sides of an engaging hole with both surfaces of the supporting plates in the vertical direction, said engaging hole having one or two engaging pieces at one side or both sides at the inside of the engaging hole, said clip which can be inserted between the supporting plates and includes an elastic head of anchor-like shape, a pair of elastic wings which project from the base portion of the elastic head upward and downward and are curved towards the elastic head, and elastic arms which project from the base portion of the elastic head in the reverse direction to the elastic head, engaging stepped portion at the free end of the cantilever of the elastic head, a pawl at the top end of the elastic arm.