A motor adapter assembly can couple a motor shaft for a ceiling fan motor to a downrod. The motor adapter assembly can include a base plate, a cradle with arms extending through the base plate, and a threaded bushing secured between the arms of the cradle. Threading a cap to the threaded bushing can be used to pivot the downrod between an upright position and a pivoted position.

Disclosed is a manual adjustable tensioning device. Slope guide slots are formed in the periphery of a lead screw nut, and contacts are provided with slopes having the same angles and placed in the guide slots of the lead screw nut; two ends of a lead screw are respectively supported in threaded holes of a shell and an end cover; screws are connected to the lead screw nut via threaded holes, the tail end of each screw is in contact with one end of a lever, the other end of the lever is in contact with the slope of the lead screw nut, a roller is mounted at the tail end of the lever, and an extension spring is mounted at the end of the slope of the lead screw nut.

The present invention relates to a bolt structure including: a base bolt having one side end portion inserted into holes formed at the time when a fixed structure and an object to be fixed are laid on top of each other; a core bolt adapted to be advanceably and retreatably screw-coupled to the base bolt; a nut fastened to the end portion of the base bolt protruding from the holes to maintain the state where the fixed structure and the object to be fixed are laid on top of each other; locking units adapted to selectively pressurize the external surface of the nut to prevent the escape of the base bolt; and a restraint unit adapted to be advanceably and retreatably screw-coupled to the base bolt and come into contact with the end portion of the core bolt to restrain the advancement and retreat of the core bolt.

A machine element has individual ring components (10, 12) fixable to third components such as axles, hubs or shafts by internal and/or external threads. One ring component (10) can be moved in an axial direction relative to another ring component (12), by clamping screws (18). The two ring components (10, 12) are independent components that delimit a separation space (22) with their adjacent mutually facing end-faces. The separation space opens on all sides to the surroundings. Only the clamping screws (18) of the adjusting device pass through the separation space (22).

A dual-prevention lock device for locking a screw and a method for locking a screw. The dual-prevention lock device comprises: a lower lock body (6); an upper lock body (1) mounted on the lower lock body (6), a receiving space for receiving a screw (3) to be locked being formed between the upper lock body (1) and the lower lock body (6); and a lock core (11) mounted on the lower lock body (6). A lower clamping part extending into the receiving space is disposed on the lower lock body (6), and an upper clamping part extending into the receiving space is disposed on the upper lock body (1). Under the action of a key, the lower clamping part is pushed by the lock core (11), so that the screw (3) to be locked is locked in the receiving space by the lower clamping part and the upper clamping part. With the upper and lower clamping parts for locking the screw, the dual-prevention lock device has a reliable performance and a simple structural design.

A locking bolt that can reliably prevent loosening even when used at sites that experience severe temperature differences and severe vibration. The locking bolt (10) has a bolt main body (11), a diameter expanding member (31), and an auxiliary bolt (21). The diameter expanding member (31) is an inside the space (17) in the bolt main body (11) and has a truncated-circular-cone-shaped side surface (32) that comes into contact with the inner wall of the space (17) and expands the diameter of the space (17). The auxiliary bolt (21) is inserted into the axial hole (15) that is provided to the bolt main body (11), moves the diameter expanding member (31) in the direction in which the diameter of the space (17) in the bolt main body (11) is expanded, and imparts diameter expanding force to the space (17) in the bolt main body (11).

Provided is a screw fastener provided with the function of a torque limiter which allows a high limit value to be set for the fastening torque without increasing the size thereof or the spring force of the spring member, and is easy to assemble and service. A multiple plate torque limiter is formed by a plurality of drive disk members (50) and a plurality of driven disk members (52) between a first member (10) and a second member (30), and the first member (10) and the second member (30) are detachably joined to each other by a retaining screw (22).