An assembly includes a composite body and a load body connected to the composite body by a fastener. The composite body is elongate along a body axis and has a first fastener opening extending radially therethrough. The load body has a second fastener opening extending therethrough. The fastener extends along an insertion axis through the first fastener opening and the second fastener opening to connect the composite body and the first load body together. The fastener has a non-circular cross-section orthogonal to the insertion axis.

A molten metal pump includes an impeller, a pump base housing at least partially enclosing the impeller, a shaft connected to the impeller, a motor connected to the shaft, a motor mount plate for supporting the motor; and a post for connecting the motor mount plate to the pump base housing. The molten metal pump can include a connector that connects the post to the motor mount plate. The molten metal pump can include a socket for connecting the shaft to the motor. The shaft can comprise an assembly including an elongated metal rod having a first end and a second end and a metal non-circular drive member attached at the second end of the elongated metal rod. The impeller can include a cap member having a plurality of generally polygonally shaped inlet openings communicating with internal passages of the impeller, each inlet opening having an inner wall and an outer wall, the outer wall being longer than the inner wall, each inlet opening also including a leading wall and a trailing wall, the leading wall and the trailing wall each interconnecting the inner wall and the outer wall and each being inclined such that an uppermost edge of each wall precedes a lowermost edge of each wall in a first rotational direction.

A propeller shaft (1), as a power transmitting shaft, of the present invention is configured such that a snap ring (8) as a retaining ring can be inserted inwards into a first penetration slot (31) formed at a tubular portion body (33) of a tubular portion (30) from a radial direction outer side. With this, good workability of assembly of the snap ring (8) is secured. Further, an engagement-stop state of a second shaft (3) by the snap ring (8) can be visually checked from the outside through the first penetration slot (31), then check of an engagement state by the snap ring (8) can be made.

A method includes disposing a first shaft and a second shaft in an end to end arrangement, positioning a sleeve over the end to end arrangement, coupling the sleeve to the first shaft via a first set of fasteners extending through a first set of radial holes in the sleeve and into the first shaft, coupling the sleeve to the second shaft via a second set of fasteners extending through a second set of radial holes in the sleeve and into the second shaft, and allowing the sleeve to self adjust the alignment between the first shaft and the second shaft while transmitting torsional, translational, or torsional and translational loading through the first set of fasteners and the second set of fasteners.

A coupler for coupling shafts comprises a virtual main axis, a coupler body, and a shaft socket provided in the coupler body, which is configured and arranged for plugging-in a shaft along the main axis and which includes a leaf spring. The leaf spring has a direction of main extension extending tangentially to a virtual arc of a circle around the main axis. The leaf spring is rigidly supported at the coupler body, and configured and arranged for engaging a circumferential surface of the shaft plugged in the shaft socket.

A power unit is configured for use as part of a concrete screed and includes a frame and a powered drive. The frame includes a drive housing. The powered drive is operably supported by the drive housing and is configured to rotate a rotatable concrete forming drum. The powered drive includes an electric motor and a battery operably coupled to the electric motor and configured to power the electric motor. The powered drive includes a drive shaft drivingly connectable relative to the drum, with rotation of the drive shaft causing corresponding rotation of the drum.

A power transmission shaft is interposed between a first shaft section and a second shaft section. The power transmission shaft comprises: a cylindrical section rotated integrally with a shaft section and formed cylindrically; a through hole disposed in the cylindrical section and penetrated radially with respect to a rotational axial line, each of a pair of vehicle side rotational shaft sections having an engagement groove disposed on an outer peripheral side of the pair of vehicle side rotational shaft sections and extended in a direction around the rotational axial line and the engagement groove being exposed from the through hole; and a retaining ring (circlip) disposed to enclose at least a portion of the outer peripheral side of the cylindrical section, a portion of the retaining ring being inserted into the through hole from the outer peripheral side of the cylindrical section and being engaged with the engagement groove.

The invention relates to a fan, in particular for an aircraft cooling unit, comprising a wheel (128) and a shaft line (136) for driving the wheel about an axis (A), said wheel including a hub (138) supporting an annular row of blades (140), and means (142) for connection to said shaft line that are housed inside said hub. The fan is characterized in that the connection means include at least one meltable safety element (158) designed to be broken and to rotationally disengage at least a portion of the connection means from the shaft line when a torque for driving the wheel that is transmitted by the shaft line exceeds a specific threshold.

A power unit is configured for use as part of a concrete screed and includes a frame, a powered drive, and a mechanical control connection. The frame includes a drive housing and a handle to be grasped by a user, with the handle being configured to facilitate manual advancement of the concrete screed in a forward direction. The handle includes a grip and a relatively shiftable user-operated drive controller. The powered drive is operably supported by the drive housing and is configured to rotate a rotatable concrete forming drum.

A power unit is configured for use as part of a concrete screed and includes a frame, a powered drive, and a drive coupler. The frame includes a drive housing and a handle to be grasped by a user, with the handle being configured to facilitate manual advancement of the concrete screed in the forward direction. The handle and the drive housing are pivotally attached relative to each other so that the handle is swingable relative to the drive housing about a pivot axis that is transverse to the forward direction. The powered drive is operably supported by the drive housing and includes a rotatable drive shaft. The drive coupler is attached to the drive shaft and is removably attachable to the connection shaft of a rotatable concrete forming drum so that rotation of the drive shaft is imparted to the connection shaft. The drive coupler is configured to align the drive and connection shafts on a common rotation axis without permitting off-axis swinging of the shafts relative to one another, such that swinging of the drive housing relative to the drum is at least substantially restricted.