The present disclosure includes a retrofitted door brake cam. The retrofitted door brake cam may, in various embodiments, comprise a hub comprising a cylindrical central axle, a plurality of projections extending radially away from an outer circumference of the central axle, and/or a cam comprising a plurality of pins that hold the projections away from a channel wall of a brake housing. The pins may be configured to break away from the cam to release the projections into contact with the channel wall, and the pins may be fitted with a cover, such that the pins are capable of withstanding abrasion and wear. The cover may comprise a cylinder having an axially running aperture, and/or a beveled edge that shaves a layer of the outer surface from one of the plurality of pins as it is fitted over the pin.

The present disclosure includes a retrofitted door brake cam. The retrofitted door brake cam may, in various embodiments, comprise a hub comprising a cylindrical central axle, a plurality of projections extending radially away from an outer circumference of the central axle, and/or a cam comprising a plurality of pins that hold the projections away from a channel wall of a brake housing. The pins may be configured to break away from the cam to release the projections into contact with the channel wall, and the pins may be fitted with a cover, such that the pins are capable of withstanding abrasion and wear. The cover may comprise a cylinder having an axially running aperture, and/or a beveled edge that shaves a layer of the outer surface from one of the plurality of pins as it is fitted over the pin.

A chain assembly includes a wheel secured on a shaft. A chain manually rotates the wheel and the shaft. A one way bearing has an inner race secured to the shaft and has an outer race that can freely rotate in only one direction in relation to the inner race. A brake drum is coupled to the outer race. Brake shoes are in operative contact with the brake drum to apply friction to the brake drum when there is relative motion between them. A brake adjuster adjusts the braking force applied by the brake shoes on said brake drum. The one way bearing is arranged to maintain the brake drum stationary in one direction of rotation of the shaft and rotate the brake drum in the opposite direction of rotation resulting in a degree of braking of the shaft as determined by the brake adjuster.

A chain assembly includes a wheel secured on a shaft. A chain manually rotates the wheel and the shaft. A one way bearing has an inner race secured to the shaft and has an outer race that can freely rotate in only one direction in relation to the inner race. A brake drum is coupled to the outer race. Brake shoes are in operative contact with the brake drum to apply friction to the brake drum when there is relative motion between them. A brake adjuster adjusts the braking force applied by the brake shoes on said brake drum. The one way bearing is arranged to maintain the brake drum stationary in one direction of rotation of the shaft and rotate the brake drum in the opposite direction of rotation resulting in a degree of braking of the shaft as determined by the brake adjuster.

A safety device for a window shade system comprising a shade tube having a first end mounted to a first bracket 100 and a second end mounted to a second bracket. The system also includes a first plurality of catchpins 110 mounted to the first bracket, wherein the first plurality of catchpins 110 are mounted below the first end of the shade tube. In response to the first end of the shade tube disengaging from the first bracket, the first plurality of catchpins 110 catch the first end of the shade tube and prevent the first end of the shade tube from further falling.

A safety device for a window shade system comprising a shade tube having a first end mounted to a first bracket 100 and a second end mounted to a second bracket. The system also includes a first plurality of catchpins 110 mounted to the first bracket, wherein the first plurality of catchpins 110 are mounted below the first end of the shade tube. In response to the first end of the shade tube disengaging from the first bracket, the first plurality of catchpins 110 catch the first end of the shade tube and prevent the first end of the shade tube from further falling.

An electromechanical actuator includes a spring brake with a helical spring, a drum, an input member, an output member and a cap. The drum includes a housing with an inner friction surface configured to cooperate with at least one turn of the spring. The input member includes a driving tooth extending between the input member and the cap. The input member or the cap includes a spacer extending between the input member and the cap. The input member includes a first radial retention element of the spring extending between the tooth and the spacer, along a first side of the brake. Furthermore, the cap includes a second radial retention element of the spring extending between the tooth and the spacer, along a second side of the brake.

A safety device for a window shade system comprising a shade tube having a first end mounted to a first bracket and a second end mounted to a second bracket. The system also includes a first plurality of catchpins mounted to the first bracket, wherein the first plurality of catchpins are mounted below the first end of the shade tube. In response to the first end of the shade tube disengaging from the first bracket, the first plurality of catchpins catch the first end of the shade tube and prevent the first end of the shade tube from further falling.

A safety device for a window shade system comprising a shade tube having a first end mounted to a first bracket and a second end mounted to a second bracket. The system also includes a first plurality of catchpins mounted to the first bracket, wherein the first plurality of catchpins are mounted below the first end of the shade tube. In response to the first end of the shade tube disengaging from the first bracket, the first plurality of catchpins catch the first end of the shade tube and prevent the first end of the shade tube from further falling.

An electromechanical actuator includes a spring brake with a helical spring, a drum, an input member, an output member and a cap. The drum includes a housing with an inner friction surface configured to cooperate with at least one turn of the spring. The input member includes a driving tooth extending between the input member and the cap. The input member or the cap includes a spacer extending between the input member and the cap. The input member includes a first radial retention element of the spring extending between the tooth and the spacer, along a first side of the brake. Furthermore, the cap includes a second radial retention element of the spring extending between the tooth and the spacer, along a second side of the brake.