摘要:
A coupling device for coupling reinforcing bars used in structural concrete comprising an elongate tubular body for receiving bar end portions, a plurality of engagers being adjustably positioned through the elongate tubular body, the coupling device being characterized in that the plurality of engagers are configured with a plurality of different end portions being configured for a different engaging of the reinforcing bars.
摘要:
A drive connector for elastomerically coupling a drive shaft to a driven shaft. An elastomeric coupling (42) includes openings (74, 80) on opposite ends that are generally "D"-shaped forming an interference fit with correspondingly shaped ends of the drive shaft and the driven shaft. A web (98) extends transversely within the interior of the elastomeric coupling, limiting the distance that the drive shaft and driven shaft are inserted within the openings of the coupling. The coupling includes a rib (72) that runs longitudinally along its outer length. A sleeve (86) having a groove (90) corresponding in size and shape to the rib is slipped over the coupling and is connected to the driven shaft. The sleeve includes a rigid interior element that is overmolded with an elastomeric material. A cam bearing (48) is fitted over a cam surface (96) on the sleeve (86) and provides a force in one direction, urging a plunger (58) to displace an elastomeric membrane (20) in a pumping cassette (10), forcing medicinal fluid to flow through the pumping cassette. The elastomeric membrane provides the restoring force to the plunger, so that a loop formed on the upper portion of the plunger and disposed around the cam bearing does not receive any force from the cam bearing to move the plunger away from the pump cassette. The elastomeric coupling and sleeve form a relatively compact assembly for coupling the drive shaft to the driven shaft and accommodate minor misalignment between the center lines of the drive shaft and the driven shaft.
摘要:
A high strength grouted pipe coupler (1, 30) by which either a pair of spaced, axially aligned steel reinforcement bars (i.e. rebars 3 and 5) are reliably spliced to one another or a single reinforcement bar (32) is spliced to a flat steel plate (34) to form a T-headed bar configuration. The reinforcement bars (3, 5, 32) are surrounded by a spiral reinforcing spring (12, 44) within a hollow cylindrical sleeve or tube (10, 36). The coupler tube (10, 36) is filled with an epoxy or cement based grout (22) within which the reinforcement bars and the reinforcing spring (12, 44) are embedded. Set screws (20, 46) are moved through the coupler tube (10, 36) to maintain the position of the reinforcement bars (3, 5, 32) prior to the coupler tube being filled with epoxy or cement. The pipe coupler (1, 30) herein disclosed has application for connecting together contiguous columns, walls, beams and similar structures to enable buildings, parking garages, bridges, subways and airports to be better able to survive a seismic event.
摘要:
A tool (20) for forming a high strength reinforcing bar coupling driving self-locking wedge sleeves over each end of a contractible jaw assembly bridging the abutting ends of the bar to be joined. The sleeves (174,175) are seated in collars (112,113) engaged by the distal ends of arms (21,22) driven for closure by a piston-cylinder power unit (40) and a cam on at least one arm. In one form the cam (60) on one arm is engaged by a roller (58) connected by a tension link (55,56) to the other arm. In another form cams are provided on each arm driven by rollers (104,105) fixed with respect to each other. The collars (112,113) include self-releasing collets (123) seating the sleeves (174,175). The tool has other uses such as bar shearing or forming.
摘要:
A method for the realisation and the maintenance of overhead line plants for telecommunications, in which the anchor or 'mooring' device of the self-gripping two-way supports of the cables, is made integral with a movable structure free to move along the supporting post. The structure comprises a chain allowing to lower the line from span level to ground level, and its successive lifting to the predetermined operative height at the end of the maintenance intervention; said lowering of the line to the ground level being obtained by expoliting the gravity force acting on the line itself, and the successive lifting, by pulling this anchor chain. The movable structures are realised according to different configurations, depending on the characteristics of the posts where these structures are used.
摘要:
A leg structure of a desk constructed to provide a stronger durability at places such as kindergarten, children's house and the like and to conform to body shape of a user such as child, thereby facilitating to easily adjust height of an upper plate, which comprises a plurality of leg members; a male screw part screwed to one end of the leg members with a bolt part externally protruded at the center thereof; a female screw part screwed to the other end of the leg members with a nut part at the center thereof to be coupled with the bolt part of the male screw part, so that a plurality of leg members with the male and female screw parts coupled at both sides thereof are sequentially connected to form a leg of a desk; a coupling unit having a bottom side coupled with an upper end of the leg, a flange part formed at an upper side to be coupled to an upper plate with a plurality of screws and a fitting protruder formed at the top center of the flange part; and a fitting groove formed at the bottom surface of an upper plate for insertion of the fitting proturder.
摘要:
A leg structure of a desk constructed to provide a stronger durability at places such as kindergarten, children's house and the like and to conform to body shape of a user such as child, thereby facilitating to easily adjust height of an upper plate, which comprises a plurality of leg members; a male screw part screwed to one end of the leg members with a bolt part externally protruded at the center thereof; a female screw part screwed to the other end of the leg members with a nut part at the center thereof to be coupled with the bolt part of the male screw part, so that a plurality of leg members with the male and female screw parts coupled at both sides thereof are sequentially connected to form a leg of a desk; a coupling unit having a bottom side coupled with an upper end of the leg, a flange part formed at an upper side to be coupled to an upper plate with a plurality of screws and a fitting protruder formed at the top center of the flange part; and a fitting groove formed at the bottom surface of an upper plate for insertion of the fitting proturder.
摘要:
The invention concerns fail-safe devices for use in reinforced concrete structures. The device (1) comprises a link (8) of high tensile strength material and first (2) and second (3) end regions. The end regions (2, 3) and the link (8) joining them are formed from a single piece of material. The link (8) is waisted such a portion thereof is of a reduced cross section. The device is designed to yield at a given loading to within close tolerances and enables the design and construction of buildings which will react in a safe way under earthquake conditions.
摘要:
A universal joint (10) for the extension of billiard cues is disclosed, said joint comprising a joint element (12) generally tubular and adapted to hold at one end the front end of an extension and to receive at the other end the butt end of a billiard cue, and a generally tubular tightening element (14) adapted to lock the cue inside the joint element (12).The joint (10') is operative irrespective of the outer diameter of the butt terminal part of the cue received therein, by the combined action of slits (42), tapered portions (28, 38, 40) and resilience of the material of which the joint element (12) is made.