A transmission stopping device for a cordless curtain includes a box assembly and a stop wheel assembly disposed in the box assembly. The stop wheel assembly includes a torsion wheel and a stop wheel. The stop wheel is provided with balls therein. A rotation-stopping assembly is provided between the stop wheel and the box assembly. The cooperation between the balls of the stop wheel and the rotation-stopping assembly in the box assembly ensures that the ascent and descent of a curtain achieves an accurate positioning.

A rope arrest-and-release device comprising a cam block assembly and a housing with front vertical rollers situated on either side of the housing, rear vertical rollers situated directly behind the front vertical rollers, and a pair of horizontal rollers situated to the interior of the front and rear vertical rollers on either side of the housing. The cam block assembly includes a cam block and a cam that rotates upward and downward via a spring. Each front vertical roller is configured to rotate forward to allow a rope to be inserted between the cam and the inside ceiling of the housing. The cam block assembly fits into an internal recess in the housing and is removable and reversible. The invention include a means for securing the device to a utility pole and for locking the cam in a downward (open) position.

A no-back brake mechanism or a torque limiter mechanism, comprising a plurality of rollers each mounted within a respective roller cage, the roller cages being articulated about an axis such that rotation of the rollers in a first direction causes no movement of the cages about their axis and rotation of the rollers in a second direction opposite the first direction causes the cages to rotate with respect to their axis.

Aspects of the present disclosure relate to a skewed roller impeller cage including a metallic ring with radially arranged slots in which rollers are positioned. Impeller shaped channels are defined around a top side of the cage to force fluid to circulate from an outer diameter of the cage to an inner diameter of the cage and vice versa. Cutouts defined at the inner diameter of the cage allow fluid to circulate from the top side of the cage to the bottom side due to centrifugal forces moving the fluid from the inner diameter back to the outer diameter of the cage to allow for continuous circulation of the fluid about the cage.

A brake device for vehicles. The brake device includes a brake disc affixed to a wheel axle and a housing with guides affixed to a support hub. At least one guided carriage and a braking element are mounted on the guides to engage the brake disc. The braking element is formed as a roller bearing enclosing the brake disc, with radially oriented elastic elements fixed to the brake disc, and distal ends are flush or free of play with the inner surface of the inner ring (6) of the roller bearing. The carriage is displaceably mounted relative to the brake disc to enable braking without sliding friction.

Aspects of the present disclosure relate to a skewed roller impeller cage including a metallic ring with radially arranged slots in which rollers are positioned. Impeller shaped channels are defined around a top side of the cage to force fluid to circulate from an outer diameter of the cage to an inner diameter of the cage and vice versa. Cutouts defined at the inner diameter of the cage allow fluid to circulate from the top side of the cage to the bottom side due to centrifugal forces moving the fluid from the inner diameter back to the outer diameter of the cage to allow for continuous circulation of the fluid about the cage.