JPS6237915Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a transmission gear in which a rotating shaft for tilting the slats is operated via several gears housed in a head box by rotating an operating tube hanging down in front of the blind. This relates to improvements to the device.

The above-mentioned transmission gear device is mainly installed inside a block-like case made of plastic material near one end of the head box. Because of the presence of a rotating shaft, a transmission gear, a slat lift cord, and rollers supporting the cord, it has been extremely difficult to reduce the volume of the case below a certain limit.

This proposal was devised with the objective of improving the operability by improving the gear transmission section inside the case, and also of making the case smaller so as to obtain a transmission device that can be applied to small blinds.

To explain the structure of the present invention with reference to the drawings, Fig. 1 is a schematic diagram of a blind to which the present device is applied, in which a slat 5 is suspended by a step cord 4 below a head box 3 that houses a rotating shaft 2 therein. The upper end of the step cord 4 is a wheel 6 fitted on the rotating shaft 2.
The end of the rotating shaft 2 is connected to the operating tube 8 via a transmission and a universal joint 7 provided on the inside and outside of the case 1 fitted to one end of the head box 3. An elevating string 9 is attached to the holder, and one end of the string 9 is pulled out of the tube through the case 1 and the operating tube 8. As the operating tube 8 rotates, the slat 5 is tilted, and the string outside the tube is pulled out. The slat 5 is pulled up by pulling on the 9 ends.

Figures 2 to 4 are front, rear, and side views of an embodiment of the blind transmission device of the present invention, and Figure 5 is a cross-sectional view taken along the line A-A in Figure 3. This is a block-shaped case manufactured by, for example, a main body part a and a lid part b, and a slat tilting mechanism is provided from the front of the case (hereinafter, the left side in Fig. 3 is referred to as the front). The rear end of the rotary shaft 2 and the upper end of the rotary tube 11 connected to the operation tube 8 are retracted from obliquely downward.

Reference numeral 12 indicates an inner shield 13 and a forward-facing bevel 14 which are hollowed out in the rear part of the case 1 into a disc shape and fitted therein.
The internal teeth 13 are meshed with a small gear 15 attached to the rotating shaft 2, and the bevel teeth 14 are meshed with bevel teeth 16 formed at the front end of the rotating tube 11.

Reference numeral 17 denotes a claw-shaped roller attached to the front of the case 1, so that the lifting string 9 passing through the head box 3 is drawn into the rotary tube 11 through the outside of the roller.

FIG. 6 is a diagram of a portion of a known blind transmission device presented for comparison with the present device, which corresponds to FIG. 5 of the present invention.
is directly attached and meshed with the bevel teeth 24 of the rotary tube 23, and there is no equivalent to the small gear 15 of the present invention.

Next, to explain the function and effect of the present device, the operation tube 8 is rotated, the rotating shaft 2 is rotated via the universal joint 7 and a group of gears in the case, and the front and back of the stage cord 4 attached to the shaft is rotated. On the other hand, when adjusting the inclination of the slat 5 supported by the cord by raising and lowering it, the operating tube 8 It requires less rotation. This reduces twisting on the several lifting cords 9 drawn into the operating tube 8.

At the same time, the position of the rotating shaft 2 in the case is pulled up above the center of the hollow gear 12, so the distance between the rotating shaft 2 and the roller 17 becomes wider, and the roller 17 has a larger diameter than known rollers, and a thick string is used. Even if the string is hung, there is no risk of it touching the rotating shaft, and together with the reduction of twisting mentioned above, the life of the string is extended.

In addition, the use of a single small gear allows for easy rotation of the operating tube, and the space between the roller 17 and the rotating shaft 2 allows for a more compact design, which has become increasingly popular in recent years. It can also be applied to small-diameter head boxes for small-sized blinds.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a blind to which the proposed device is applied, Fig. 2 is a front view of an embodiment of the proposed blind transmission device, Fig. 3 is a rear view, Fig. 4 is a side view, and Fig. 5 is a front view of an embodiment of the proposed blind transmission device.
The figure is a sectional view taken along the line A--A in FIG. 3, and FIG. 6 is a view of a portion of the known blind transmission device corresponding to FIG. 5 of the present invention. 1: Case, 2: Rotating shaft, 3: Head box, 8: Operating tube, 9: Lifting cord, 11: Rotating tube,
12: Hollow gear, 13: Internal teeth, 14: Bevel teeth, 1
5: Small gear, 16: Bevel teeth.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The front face of a block-shaped case that houses therein a rotating shaft end for tilting the slat, a rotating tube end linked to the operating tube, and a gear mechanism for transmitting power between the two rotating parts. A blind operating device comprising a string receiving roller held by a string receiving roller and one end of a slat elevating string drawn downward through the roller, the rotating tube and the operating tube, the blind operating device having internal teeth and forward bevel teeth on the rear surface of the interior of the case. A small gear that holds a hollow gear and is attached to the rotating shaft on the internal teeth of the hollow gear,
A blind transmission gear device comprising bevel teeth that engage upwardly facing bevel teeth formed at the upper end of the rotary tube. (2) A blind transmission gear device in which a small gear is meshed with the top of the internal teeth of the hollow gear to form as wide a gap as possible between the rotating shaft for tilting the slat and the string receiving roller.