JPH0524796Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a locking device for a ladder cord of a Venetian blind.

[Prior art] Each slat of a Venetian blind is supported by a ladder-like ladder cord, and the tips on both sides of the ladder cord are formed into loops and connected to a drum, as disclosed in Japanese Utility Model Publication No. 60-22235. It was hung on a slippery ring hook.

[Problems to be solved by the invention] It was not easy to form the tip of the ladder cord into a loop and caulk the base with metal fittings.
Furthermore, if the hook for hanging the loop is made to protrude radially or axially from the ring, the device becomes larger, but since the space within the head box is limited, it is desirable to make it as compact as possible.

The present invention was made to solve this problem, and its purpose is to make it possible to easily lock the rudder cord without forming a loop at the end of the rudder cord. An object of the present invention is to provide a locking device for a ladder cord that does not require a hook to particularly protrude in the radial or axial direction in order to lock the ladder cord.

[Means for Solving the Problem] In order to achieve the above object, the feature of the present invention is to provide two substantially C-shaped cross sections on the circumferential surface of the ring 10, as shown in FIGS. 1 and 2. The locking part 12,
12 is provided, and the opening width of the locking part is less than or equal to the thickness when the string 21 of the ladder cord 20 is made flat.
The cross section of the inner gap 15 is formed larger than the cross section of the string 21 of the ladder cord 20, and a locking portion 12 is formed at the tip of the string 21 of the ladder cord 20.
This is due to the provision of a knot 22 larger than the cross section of the cavity 15 inside.

It is desirable that the opening 14 of the locking portion be located on one side in the axial direction. The joint portion 22 can be easily formed by tying the tip of the ladder cord, caulking a metal fitting thereto, or applying thermosetting resin thereto.

[Function] When the string 21 following the node 22 of the ladder cord 20 is made flat, it can be easily inserted through the opening 14 of the locking portion 12 into the gap 15 having a larger cross section than the internal string. When the ladder cord 20 is pulled downward by the weight of the slat, the knot 22 at the tip engages the locking portion 12, but the cross section of the knot 22 is
Since the cross section of the air gap 15 of No. 2 is large, the joint portion 22
cannot pass through the gap 15 inside the locking part 12. Therefore, the tip end of the ladder cord 20 is locked to the locking part 12 of the ring 10 via the node 22.

[Example] The apparatus of the present invention will be described in detail based on an example shown in the drawings.

As shown in FIGS. 1 and 2, nodes 22, 22 are provided at the tips of the strings 21, 21 on both sides of the ladder cord 20 by caulking metal fittings. ring 1
0 consists of a ring-shaped main body 11 and two locking parts 12, 12 integrally formed on the circumferential surface of the main body.
As shown in FIG. 5, the locking portion 12 has a nearly C-shaped cross section in the radial direction of the main body 11. As shown in FIG. The opening 14 in the outer radial direction of the locking part 12 is located on one side in the axial direction, and its width is approximately the same as the thickness of the string 21 of the ladder cord 20 when it is made flat.
The cross section of the void 15 inside thereof is formed to be larger than the cross section of the string 21.

The main body 11 of the ring 10 consists of a split ring-shaped slip ring part 16, a guide ring part 17 with a larger inner diameter, and an arc part 18 connecting the two parts. It fits over the drum 32 but can also be slipped on it. The arc portion 18 is the locking portion 12, 12
It is one with the bottom of. Protrusion 1 on guide ring part 17
3 is provided, and the protrusion 13 is connected to the bracket 3 shown in FIG.
The ring 10 hits the stopper 32 provided on the ring 10.
The rotation range of the motor is regulated. It is desirable to provide a thin arc-shaped cover 25 spanning both the locking parts 12, 12 so that the node part 22 of the ladder cord 20 does not protrude in the outer radial direction.

As shown in FIGS. 3 and 4, a holder 31 is attached to a head box 30 of the blind, a cover drum 35 is rotatably supported by the holder, and a winding drum 32 moves in and out of the holder. The main body 11 of the ring 10 is slidably fitted onto the winding drum 32. Headbox 30
A rotating shaft 29 having a polygonal cross-section and rotatably supported by the winding drum 32 and the cover drum 35 passes through the winding drum 32 and the cover drum 35 so as to rotate integrally and slide relative to each other.

The lifting cord 34 wound around the drum 12 hangs down from the hole in the holder 31, passes through each slat 40, and is fixed to the bottom rail 41. A ladder cord 20 whose tip end is fixed to the ring 10 also hangs down from another hole of the holder 31 to support each slat 40, and its lower end is also fixed to the bottom rail 41.

Knots 22, 2 at both ends of the ladder cord 20
If the strings 21, 21 following 2 are made flat, they will easily fit into the openings 14, 14 of the locking parts 12, 12.
Attaching the ladder cord 20 to the ring 10 is easy.

The operation of tilting the slats of a blind to which a ladder cord is attached using the device of the present invention is exactly the same as that of the conventional one.
2 rotate together, and the ring 10 above it also rotates. As a result, the strings 2 on both sides of the ladder cord 20
Since one of the slats 1 and 21 is raised and the other is lowered, the slope of the slat 40 changes. Since the rotation range of the ring 10 is restricted, excessive inclination of the slats 40 is prevented.

[Effects of the invention] The device of the present invention has knots at the tips of the strings on both sides of the ladder cord, but unlike conventional loops, the knots can be formed very easily, reducing costs. It has the effect of helping to reduce Furthermore, unlike the hooks that hang loops, the locking portions that lock the knots protrude only slightly in the outer radial direction, so that the device as a whole becomes more compact.

[Brief explanation of the drawing]

1 and 2 are a side sectional view and a plan view of the ring and the tip of the ladder cord according to an embodiment of the present invention,
Fig. 3 is a front view showing the main parts of a blind equipped with the device shown in Fig. 1, Fig. 4 is a sectional view taken along the - line in Fig. 3, and Fig. 5 is a sectional view taken along the - line in Fig. 1. It is. In the figure, numeral 10 is a ring, 11 is a main body,
12 is a locking portion, 14 is an opening, 15 is a gap, 20 is a ladder cord, 21 is a string, 22 is a knot, 25 is a cover, 29 is a rotating shaft, and 32 is a drum.

Claims (1)

[Claims for Utility Model Registration] 1. A ring 10 in which a main body 11 is slidably fitted onto a drum 32 that rotates together with a rotating shaft 29.
and two locking portions 12, 12 provided at the center of the circumferential surface of the main body with a gap therebetween, and a ladder cord 20 whose ends on both sides are removably locked in the gap between the locking portions. The main body includes a circular arc portion 18 along the circumferential surface of the drum, and ring portions 16 and 17 in the form of split rings having a larger outer diameter that sandwich the circular arc portion 18 in the axial direction. The ring portion forms a gap 15 that opens in the outer radial direction, and the two locking portions protrude in the axial direction from one of the ring portions 16 and connect the string of the ladder cord between the ring portion and the other ring portion 17. An opening 14 is formed in the outer radial direction and has a similar thickness to the flat thickness of the ladder cord. A ladder cord locking device for a blind characterized by the following: 2 Cover 2 that covers the two locking parts from the outer circumferential side
5. A ladder cord locking device for a blind according to claim 1, characterized in that the ladder cord locking device is provided with a ladder cord locking device for a blind. 3. The ladder cord locking device for a blind according to claim 1, wherein the knot 22 is formed by tying the tip of the string 21 of the ladder cord 20 or by caulking a metal fitting thereto.