A clamping device has a body, at least one clamping member and an operating cover. The clamping member blocks at least one of the wire elements. The body has a cavity for passage a wire element and to house a clamping member, so that the clamping member is movable in the cavity along a first axis to a blocking position of the wire element. The operating cover is movable along the first axis relative to the body, and allows movement of the clamping member relative to the body along the first axis. The clamping device also has a drive device of the clamping member. The drive device enables free movement of the clamping member along the first axis with respect to the operating cover and with respect to the body, and enables movement of the clamping member away from the blocking position by actuation of the operating cover.

A push button slide mechanism, includes an outer member having a bottom wall and an upstanding side wall. The outer member defines at least one pair of holes through the upstanding side wall. The mechanism includes an inner member having a top plate and a bottom plate defining a single annular channel therebetween. The single annular channel receives an elongated member in all rotational positions of the inner member relative to the outer member. A spring member spring-biases the outer member relative to the inner member. Pressing the inner member toward the outer member against the spring forces of the spring causes the single annular channel to align with the holes through the upstanding side wall of the outer member.

A hold down device is provided for continuous loop cords or bead chains in a window covering installation. The hold down device engages the cord or chain while the cord or chain is loosely suspended, and prevents operation by encountering the head rail if the cord or chain is operated. Mounting the hold down device in a window covering installation disengages the hold down device from its secured position relative to the cord or chain.

A rope buckle assembly includes a female buckle and a male buckle. The female buckle has an accommodating slot and a plurality of openings being in spatial communication with and respectively arranged at two opposite side of the accommodating slot. The accommodating slot has two guiding surfaces protruding from a slot bottom thereof. The male buckle has two through holes in spatial communication with each other and includes two elastic arms spaced apart from each other. When the male buckle and the female buckle jointly receive an external force to move from an initial position to a through position, the two elastic arms are compressed and deformed by respectively abutting against the two guiding surfaces, so that each of the two through holes becomes smaller, and each of the two through holes corresponds in position to two of the openings for jointly defining a rope channel.

A rope buckle assembly includes a female buckle and a male buckle. The female buckle has an accommodating slot and a plurality of openings being in spatial communication with and respectively arranged at two opposite side of the accommodating slot. The accommodating slot has two guiding surfaces protruding from a slot bottom thereof. The male buckle has two through holes in spatial communication with each other and includes two elastic arms spaced apart from each other. When the male buckle and the female buckle jointly receive an external force to move from an initial position to a through position, the two elastic arms are compressed and deformed by respectively abutting against the two guiding surfaces, so that each of the two through holes becomes smaller, and each of the two through holes corresponds in position to two of the openings for jointly defining a rope channel.

A cord lock includes a female member including first cord insertion portions through which a cord can be inserted to pass; a male member capable of moving in and out from an opening of the female member, and including second cord insertion portions through which the cord inserted to pass through the first cord insertion portions can pass; and an urging device provided between the female member and the male member to provide an urging force in a direction wherein the male member protrudes from the opening of the female member. The second cord insertion portion of the male member and the urging device are located adjacent to each other, and on opposed faces of the female member and the male member along an insertion direction of the cord, straight portions which can carry out at least a line contact are provided.

A hold down device is provided for continuous loop cords or bead chains in a window covering installation. The hold down device engages the cord or chain while the cord or chain is loosely suspended, and prevents operation by encountering the head rail if the cord or chain is operated. Mounting the hold down device in a window covering installation disengages the hold down device from its secured position relative to the cord or chain.

A hold down device is provided for continuous loop cords or bead chains in a window covering installation. The hold down device engages the cord or chain while the cord or chain is loosely suspended, and prevents operation by encountering the head rail if the cord or chain is operated. Mounting the hold down device in a window covering installation disengages the hold down device from its secured position relative to the cord or chain.