JPS6147270B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a plurality of carriage bodies supported movably in the horizontal direction along guide rails.
The worm is horizontally supported, and the worm wheel that meshes with the worm is vertically supported.
A slat is suspended from the lower part of the worm wheel shaft exposed below the carrier body, and by rotating the worm shaft, the rotation is transmitted to the worm wheel shaft to adjust the opening/closing angle of the slat. This relates to a slat carriage in a vertical blind configured such that only the worm slips and rotates when a force above a certain level is applied between the worm and the worm wheel.

Conventional techniques of this type include Japanese Patent Application Laid-Open No. 51-98139 and Japanese Utility Model Application No. 53-62139. In the former,
It has a double structure with a bushing interposed between the worm and its rotational drive shaft, and when a certain amount of force is applied to the worm, slipping occurs between the worm and the bushing, preventing the worm from rotating. but,
Incorporating the same bushing requires a large number of parts, which is difficult to assemble, and it is also difficult to create slippage between the bushing and the worm with a predetermined force and to maintain its performance constant over many years. .

In the latter case, the teeth of the worm wheel are made of an elastic material, and when a force above a certain level is applied to the worm, the teeth bend and the worm spins idly. Since the tooth part itself must be bent, this tooth part is easily damaged and deformed, which may impede the transmission of rotational motion, and it is also difficult to find a material that can withstand the bending. Ta.

The purpose of this invention is to create a plate that allows the axial center of the worm shaft to shift so that when a force above a certain level is applied between a worm and a worm wheel that are meshing with each other, the mesh is disengaged and only the worm rotates by slipping. It is an object of the present invention to provide a vertical blind slat carriage which can eliminate the above-mentioned drawbacks by forming a spring part on one side of a worm bearing hole formed through the main body of the carriage.

An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 9. As shown in FIGS. A bearing hole 5 through which a spline shaft 4 is horizontally inserted, and a semi-circular long hole 6 along one half circumference of the coaxial shaft receiving hole 5 are transparently formed in the side plates 3 of the plurality of supported box-shaped carriage bodies 2. One side of the bearing hole 5 is open to an elongated hole 6, and a pair of cantilever-shaped plate spring portions 7 are formed between both holes 5 and 6.

As shown in FIGS. 2 to 6, a rotary shaft 11 having a worm wheel 9 at the top and a hook 10 at the bottom is vertically inserted into an opening 8 provided at one side of the bottom of the carriage body 2. When the support shaft 11 is inserted through the circular hole 12 so that the hook 10 of the rotation support shaft 11 is exposed below the carriage body 2, one side of the support shaft 11 is formed. A stopper piece 13 protruding toward the opening 8 is supported on both side edges 8a of the opening 8. Support holes 14 are transparently provided in the lower portions of the side plates 3 in correspondence with the openings 8, and the lower surfaces thereof are flush with the upper surfaces of the side edges 8a of the openings 8.

As shown in FIGS. 2, 4, and 8, the worm 15 supported by the spline shaft 4 in the carriage body 2 has its boss portion 15a fitted into the bearing hole 5 of the side plate 3. The plate spring portion 7 of the bearing hole 5 is engaged with the worm wheel 9 on the upper portion of the rotation support shaft 11 at a position opposite to the plate spring portion 7 of the bearing hole 5. The tooth profile of the tips of the worm wheel 9 and the worm 15 is semicircular with concavities and convexities, as shown in FIG.

In addition, in FIG. 2, 16 is an insertion hole for inserting a connecting piece 17 that connects each carriage body 2, and 18 is an insertion hole for passing an opening/closing cable 19 for moving each carriage body 2 in the horizontal direction along the guide rail 1. They are a pair of insertion holes.

As shown in FIGS. 1 and 2, a slat 20 is hooked onto the hook 10 exposed downwardly of each carriage body 2, and the opening and closing adjustment of the slat 20 is performed by connecting the spline shaft 4 to the rotation cable at one end of the slat 20. 21 to rotate the worm 15 and the worm wheel 9.
This is done by transmitting the rotation to the rotation support shaft 11 via the rotation support shaft 11. As shown in FIG. 7, the opening/closing range of the slat 20 is a 180 degree range in which the stopper piece 13 of the rotating shaft 11 passes through the support hole 14 at the bottom of the both side plates 3 and comes into contact with the stopper part 14a at one end thereof. becomes.

When the stopper piece 13 of the rotation support shaft 11 is in contact with the stopper portion 14a of the support hole 14 and does not rotate any further, rotational force is further applied to the spline shaft 4, causing the worm 15 and the worm wheel 9 to mesh with each other. If a force above a certain level is applied between them, the worm wheel 9 cannot rotate any further, so the repulsive force applied to the worm 15 causes the axis of the spline shaft 4 to move between the pair of leaf springs 7 of the side plates 3. The worm 15 is pushed open against the force and shifted toward the elongated hole 6, and the worm 15 is removed from the worm wheel 9, and only the worm 15 and the spline shaft 4 supporting it slip and rotate. Therefore, when the slat 20 is opened and closed, no excessive force is applied to the rotating support shaft 11. Further, when the rotation of the spline shaft 4 is stopped, the worm 15 and the spline shaft 4 return to the center of the bearing hole 5 due to the urging force of the plate spring portion 7, and the worm wheel 9 and the worm 15 are engaged again, and the slat 20 can be opened and closed.

In other embodiments shown in FIGS. 10 and 11, the plate spring portion 7 is shaped like a beam fixed at both ends, and in particular the first
The plate spring portion 7 shown in the figure has a central portion that is thinner than both ends so as to be easily bent.

As described in detail above, in the slat carriage according to the present invention, the worm 15 is horizontally supported on four shafts within the plurality of carriage bodies 2 supported so as to be movable in the horizontal direction along the guide rail 1. At the same time, a worm wheel 9 that meshes with this worm 15 is vertically supported by a shaft 11, and the worm wheel shaft 1 is exposed below the carriage main body 2.
A slat 16 is suspended from the lower part of the carriage body 2, and the shaft 4 supporting the worm 15 is inserted into a bearing hole 5 formed transparently in the carriage body 2, and the shaft 4 supporting the worm 15 is inserted into the bearing hole 5, which is located opposite to the meshing part between the worm 15 and the worm wheel 9. Hole 5
Since a plate spring portion 7 is formed on one side to allow for misalignment of the worm shaft 4, it is easy to improve the existing worm bearing hole 5 in the carriage body 2, and the number of parts can be increased. Despite this structure, when the slats 20 are opened and closed, even if a certain amount of force is applied between the worm 15 and the worm wheel 9, which are engaged with each other, the engagement will be disengaged and only the worm 15 will slip. The worm 15 and the worm wheel 9 can be rotated to reliably absorb the unreasonable force applied to the worm 15 and the worm wheel 9, preventing them from being damaged or deformed. The slats 20 can be opened and closed, and the slats 20 can be opened and closed with peace of mind.

[Brief explanation of the drawing]

Figure 1 is a cutaway view showing the entire guide rail, Figure 2
The figure is a cross-sectional view of the guide rail portion of the vertical blind according to the present invention, FIG. 3 is a perspective view of the carriage main body cut away, FIG. 4 is a cross-sectional view of the carriage main body, and FIG. 5 is a cross-sectional view of the carriage main body. -X-line cross-sectional view, Figure 6 is a Y-Y cross-sectional view in Figure 4, Figure 7 is a Z- line cross-sectional view in Figure 2.
FIG. 8 is an enlarged sectional view along the Z line, FIG. 8 is a front view of the worm, FIG. 9 is an enlarged sectional view showing the tooth profile of the worm and the worm wheel, and FIGS. 10 and 11 are views showing other embodiments. Carriage body 2, spline shaft 4, bearing hole 5, leaf spring part 7, worm wheel 9, hook 1
0, rotation support shaft 11, stopper piece 13, stopper part 14
a, worm 15, slat 20.

Claims (1)

[Scope of Claims] 1. A worm 15 is horizontally supported on four shafts within a plurality of carriage bodies 2 supported so as to be movable in the horizontal direction along a guide rail 1, and a worm wheel 9 is meshed with the worm 15. The worm wheel shaft 11 is vertically supported by a shaft 11, and a slat 1 is attached to the lower part of the worm wheel shaft 11 exposed below the carriage main body 2.
In a vertical blind slat carriage with a vertical blind 6 suspended therein, the shaft 4 supporting the worm 15 is inserted into a bearing hole 5 transparently provided in the carriage body 2,
One side of the coaxial receiving hole 5, which is opposite to the meshing part between the worm 15 and the worm wheel 9, is located at a position opposite to the meshing part between the worm 15 and the worm wheel 9. A slat carriage for a vertical blind, characterized in that a plate spring part 7 is formed to allow the axial misalignment of the worm shaft 4 so that only the worm 15 slips and rotates when the worm shaft 4 comes off. 2. The vertical blind slat carriage according to claim 1, wherein the leaf spring portion 7 has a cantilever shape. 3. A slat carriage for a vertical blind according to claim 1, wherein the leaf spring portion 7 has a beam shape with both ends fixed.