| 摘要 |
The assembly comprises head and bottom rails, blind material, a lift cord and a safety device attached to the blind material proximal the bottom rail and arranged to clamp the lift cord and release it when the force upon it exceeds a predetermined amount. The safety device may comprise a plunger 25 and socket 23 with complementary openings 57, [35, fig 5] defining a clamping sleeve through which the cord extends. A biasing spring 27 may provide the clamping force. The safety device may have a structure 31 for attachment to the blind material. The structure may be a loop or hook for respectively sewing or clipping to the blind material. The loop may have teeth 43 for retaining the sewn thread. Also claimed separately is the safety device, a kit of parts for constructing the blind assembly, and a method of improving the blind assembly using the safety device. |
