A boost compressor assembly may comprise an outer annular structure and a plurality of blades. Each blade in the plurality of blades may be moveably coupled to the outer annular structure. The plurality of blades may be configured to deploy in response to the boost compressor assembly rotating. The plurality of blades may be configured to retract when the boost compressor assembly stops rotating.

The present invention relates to a plurality of airfoil rim wings, and/or fan-like blades which may be flat or take the form of airfoil wings in a preferred embodiment are attached to an automobile's wheel rims for the extraction of air pressure buildup within the wheel wells during forward movement to improve overall performance, styling and brake cooling. The airfoil rim wings, and/or fan-like blades may either be adhered to a wheel surface or individually or collectively fastened to wheels' hub using open-ended lug nuts, and securing lug bolts. Further, the airfoil rim wings, and/or fan-like blades may be arranged to specific concavity and angel of attack using twistable beveled washers on both sides of the airfoil rim wings, and/or fan-like blades.

The invention relates to a combined ceiling fan and light fixture, wherein the roots of the plurality of blades of the ceiling fan are respectively fixedly connected to a plurality of rotating components correspondingly arranged on the impeller. Each rotating component comprises a synchronous wheel, and all synchronous wheels are distributed on the bottom of the impeller with the wheel center of the impeller as the array center. Any two adjacent synchronous wheels are connected to each other by a swinging rod so that all the synchronous wheels move in the same direction with the corresponding blades. At least one swinging rod is connected with a spring for pulling the swinging rod back in the opposite direction of the centrifugal force of the blade to drive all the blades to be synchronously folded on the top of the impeller when the motor stops. The blade retraction mechanism of the invention has the advantages of high transmission precision, good operational stability, low noise and low cost.

This radiator fan for cooling a radiator has: a rotating member that rotates due to rotation of an engine; blade members that are provided on the peripheral surface of the rotating member such that the angle of surfaces that receive air is changed; a moving member, which is provided in the rotating member, and which moves toward the peripheral surface of the rotating member due to centrifugal force generated by means of the rotation of the rotating member; and a connecting member, which is connected to the moving member and the blade members, transmits the movement of the moving member to the blade members, and changes the angle of the surfaces.

A folding and unfolding structure of blade of a ceiling fan includes a driving device, a rotary member, multiple connection arms, multiple fixed arms, multiple extension arms, multiple elastic members and multiple blades. The rotary member rotates synchronously with the driving device. One end of the connection arm is connected to the rotary member, and the other end of the connection arm is pivotably connected to one end of an extension arm by a first pivot. One end of the fixed arm is connected to a blade, and the other end of the fixed arm is pivotably connected to the other end of an extension arm by a second pivot. The elastic members are provided between the extension arms and the connection arms to restricting outward expansion of the extension arms, such that the extension arms are pivoted upward about the first pivots and move close to the rotary member.

A cooling fan for an alternator. The cooling fan has a fan body and a plurality of fan blades extending from the fan body. A hinge is located where each one of the fan blades meets the fan body. The hinge allows the plurality of fan blades to pivot relative to the fan body. The degree of pivot is proportional to rotational speed of the fan body.

A bistable pitch propeller includes a ball, a spring, and a clutch module where the clutch module has a range of rotational movement between a locked end position and a released end position. The clutch module includes a detent, where the ball sits inside and outside of the detent when the clutch module is in the locked end position and released end position, respectively. In response to an input torque and a spring force from the spring, the clutch module rotates toward the released end position and the locked end position, respectively. The bistable pitch propeller also includes an aircraft blade where the aircraft blade is at the first pitch angle and the second pitch angle when the clutch module is in the locked end position and the released end position, respectively.

A fan blade is mounted on a shaft or arranged to vary in pitch via rotation about a pitching axis. The fan blade is mounted with a center of mass offset from the shaft or pitching axis. This offset reduces torque around the shaft or pitching axis.

A folding and unfolding structure of blade of a ceiling fan includes a driving device, a rotary member, multiple connection arms, multiple fixed arms, multiple extension arms, multiple elastic members and multiple blades. The rotary member rotates synchronously with the driving device. One end of the connection arm is connected to the rotary member, and the other end of the connection arm is pivotably connected to one end of an extension arm by a first pivot. One end of the fixed arm is connected to a blade, and the other end of the fixed arm is pivotably connected to the other end of an extension arm by a second pivot. The elastic members are provided between the extension arms and the connection arms to restricting outward expansion of the extension arms, such that the extension arms are pivoted upward about the first pivots and move close to the rotary member.

A fan of a turbine engine, the fan including a fan disk provided with blades on its periphery, the blades being pivotally mounted on the disk around a pivoting axis and having a center of gravity, and a pitch change mechanism for the blades, each blade being configured so that its center of gravity is positioned on or at a small distance from a fictitious plane which passes through the pivoting axis of the blade and which is perpendicular to the axis of revolution of the fan when the blade is in a minimum drag position.