JPH0423197Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The invention is based on the invention by attaching slats to both ends of the slats used in blind curtains installed at the windows and entrances of buildings.
This relates to a crank arm connected via a crank pin.

[Prior Art] Conventionally, crank arms of this type are known, such as those shown in FIGS. 4 to 8A and 8B, for example.

In the above configuration, the slats 1 are formed into a rectangular shape, and a plurality of slats 1 are rotatably arranged vertically with their outer surfaces 1a parallel to each other and either horizontally or vertically.

Each slat 1 has one end 2a of a crank pin 2 fixed to both ends thereof via, for example, a slat bead, and the other end 2b of the crank pin 2.
is passed through the crank plate 4 of the link mechanism 3.

In the link mechanism 3, one crank plate 5 is rotatably connected to one crank plate 4 to form one link unit 6, and a plurality of link units 6 are connected to form a plurality of slats. 1 are connected to each other.

Furthermore, a base 7a of a crank arm 7 is fixed to the tip of the other end 2b of the crank pin 2.

The crank arm 7 is arranged to be inclined at a predetermined angle with respect to the outer surface 1a of the slat 1.
As shown in FIG. 5, a shaft 8 is protruded from the distal end portion 7b, and an engaging portion 9 is fixedly provided at the distal end of the shaft 8.

The engaging portion 9 is formed in an elliptical shape having approximately the same width as the opening 11a of the guide groove 11, and the opening/closing guide 10
It is engaged with the guide groove 11 via the shaft 8 so that it can move up and down and rotate freely. The guide groove 11 has a width wider at the inner part than the width of the opening 11a.
On the other hand, a lifting plate 12 is attached via a crank pin 2 to the base 7a of the crank arm 7 connected to the lowermost slat 1.

As shown in FIG. 6, the opening/closing guide 10 is attached laterally (back and forth) to a pair of box-shaped side frames 13, 13 attached to the side edges of a window, doorway, etc. (not shown).
It is installed so that it can be moved and operated freely.

The upper parts of the side frames 13, 13 are bridged by a case 14 that houses a motor M as a drive source, and the motor M is interlocked and connected to a drive shaft 15.
Sprockets 16, 16 are provided at both ends of the sprocket 5.

The upper end of a chain 17 is hung on each sprocket 15, and the lower end thereof is attached to the lifting plate 12.

The blind curtain 18 is raised and lowered together with the lifting plate 12 by the operation of the chain 17, and the link mechanism 3 is expanded and contracted to raise and lower each slat 1.

On the other hand, by moving the opening/closing guide 10 back and forth, the crank arm 7 is rotated, and through these rotations, each crank pin 2 is rotated, and each slat 1 is rotated from a horizontal state to a vertical state.

In the above configuration, as shown in FIG. 7A, the width of the engaging portion 9 is formed to be approximately the same width as the opening 11a of the guide groove 11 to facilitate insertion into the guide groove 11. As shown in FIG. 7B, it is rotated so that both ends thereof are engaged with the guide grooves 11.

However, when the engaging part 9 rotates in conjunction with the rotation of the shaft part 8 and reaches the state shown in FIG. 7A, there is a problem that the engaging part 9 separates from the guide groove 11.

Therefore, in order to solve this problem, Fig. 8A
As shown in FIG. 1, for example, a circular engaging portion 19 having a diameter larger than the width of the opening 11a is provided.

[Problems to be Solved by the Invention] However, in the above-mentioned engaging portion, when the crank arms (not shown) are overlapped as shown in FIG. An extra space is formed at a location other than the point of polymerization and contact. For this reason, the length of the opening/closing guide becomes large, which creates a gap above and below the overlapping slats of the blind curtain, resulting in a problem that the blind curtain becomes larger than necessary.

[Purpose of the invention] The invention was made in order to solve the above problems, and its purpose is to prevent the generation of extra spaces when polymerized, and also to prevent separation from the guide groove during rotation. To provide a crank arm for a slat for a blind curtain, which is provided with an engaging part that does not interfere with the slat.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a large number of blind curtain slats 1 having crank pins 2 bases fixed at both left and right ends, which can be moved up and down inside an opening of a building. The slats 1 are moved in the direction and rotated in parallel around the crank pin 2, and the tips of the crank pins 2 protruding from one end of each slat 1 are attached at the same angle in the front or rear direction. Each of the slats 1 is provided with a crank arm 7 that is fixed in a protruding manner, a large-diameter engaging portion 20 that is fixed to the outer end of the shaft 8 that is fixed to the outer wall surface of the tip of each crank arm 7, and each of the slats 1. An opening/closing guide 10 made of a vertically elongated beam member with a substantially U-shaped cross section is provided on the inner wall surface of an opening in a building so as to be movable in the front-back direction. The opening/closing guide 10 is formed to be narrower than the groove, and each engaging part 20 is inserted into the guide groove 11 of the opening/closing guide 10 with its shaft 8 located within the opening 11a and opened/closed. When the guide 10 is moved in the front-back direction, each shaft 8 is pushed against the wall surface of the opening 11a, and each slat 1 is rotated to open and close via the crank arm 7 and crank pin 2. A drive structure is a prerequisite.

Therefore, in the present invention, each of the engaging portions 20 is
It is formed in an elliptical shape, and the length of its diameter in the minor axis direction is approximately equal to the opening width of the opening 11a, and the left and right outer peripheral wall surfaces through which the minor axis of the diameter of each engaging portion 20 passes. A protrusion piece 21 consisting of a small protrusion is integrally formed on the slat 1, and in the position where each slat 1 is rotated horizontally and overlapped with the upper part of the opening of the building, each engaging part 20 has a diameter of The long axes or short axes thereof form an inclination angle parallel to each other, and the positions of the vertically opposing protruding pieces 21 are set at positions offset from the front and back of the outer peripheral wall surface of each vertically opposing engaging portion 20. It is characterized by

[Operation] With the above configuration, even if the engaging portion is rotated, the protruding piece engages with the guide groove, so that the engaging portion does not separate from the guide groove.

Moreover, as shown in FIG. 3, when the upper and lower engaging portions are superimposed, the lower wall surfaces of the upper and lower surfaces of the upper and lower engaging portions come into close contact with each other, so that there is no gap and the device is compact.

[Example] Hereinafter, the present invention will be explained with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1-3.

In this embodiment, the same or equivalent members and parts as in the conventional example described above are given the same reference numerals, and the explanation thereof will be omitted.

In the crank arm of the blind curtain slat according to the present invention, the engaging portion 20 is formed in an elliptical shape, and the width W in the short axis direction is equal to the width of the opening 11a in the guide groove 11 of the opening/closing guide 10. They are formed almost identically to facilitate insertion into the opening 11a.

The engaging portion 20 is provided with protruding pieces 21, 21 at both ends in the short axis direction so as to face each other.

The protruding pieces 21, 21 are made to protrude outward from the engaging part 20, and their shape facilitates the insertion of the engaging part 20 into the opening 11a as shown in FIG. is formed into a triangular piece shape so as to reliably engage with the guide groove 11.

The protruding pieces 21, 21 also move the engaging portion 20 from the state shown in FIG. 2A to the state shown in FIG. 2B.
When rotated by 90 degrees, it is positioned on the central axis of the opening 11a, and in this position, both ends of the engaging part 20 in the longitudinal direction are set to surely engage with the guide groove 11. ing.

Then, when the engaging portion 20 is rotated by approximately 45 degrees as shown in FIG. 2 C from the state shown in FIG. 2 B, the engaging portion 20
0 in the longitudinal direction are set so as to reliably engage with the guide groove 11 as in FIG. 2B.

In this state, each slat 1 is pulled upward and superimposed on each other, and each of the other crank arms 7 fixed to the other end of each slat 1 via a crank pin is also moved as shown in FIG. Polymerized into At this time, since the engaging parts 20 are overlapped at an angle of approximately 45° C., no gaps are formed between the engaging parts 20, and the protruding pieces 21 are accommodated in this overlapping surface without coming into contact with each other. Ru.

Next, the operation of the configuration described above will be explained.

With the above configuration, when each crank arm 7 is overlapped and the engaging parts 20 are overlapped, each engaging part 2
There is almost no gap formed between 0 and the protruding piece 21 is housed in this gap, so the protruding piece 2
The phenomenon of contact between one comrade does not occur.

Further, even if the engaging portion 20 is rotated, the protruding piece 21 is engaged with the guide groove 11, so the engaging portion 20 does not separate from the guide groove 11.

[Effects of the invention] As explained above, the present invention provides protruding pieces that engage with the guide grooves when the engaging part rotates at both ends of the oval engaging part in the short axis direction. It is characterized by

Therefore, according to the present invention, it is easier to engage the engaging portion with the guide groove, and the crank arm is prevented from coming off the guide groove when the slat is rotated, so there is no trouble during operation. As a result, reliability as a blind curtain is significantly improved.

Further, when the slats are overlapped, no extra space is formed between the engaging portions of the crank arms, so the overlapping dimensions are small and compact, preventing unnecessary enlargement and improving the appearance.

[Brief explanation of the drawing]

FIG. 1A is a perspective view showing an embodiment of the crank arm of the slat for a blind curtain according to the present invention, FIG. 1B is a sectional view showing the engaged state, and FIG.
Figures A, B, C and Figure 3 are front views explaining the action of the crank arm, Figure 4 is a perspective view of a conventional example, Figure 5 is a perspective view of the crank arm, and Figure 6 is a conventional blind curtain. A perspective view of a blind curtain equipped with a crank arm of a slat, FIGS. 7A and 7B are front views of a conventional engaging part, and FIGS. 8A and B are front views showing another conventional example of an engaging part. . 1... Slut, 2... Crank pin, 7...
Crank arm, 10... Opening/closing guide, 11...
Guide groove, 20... engaging portion, 21... protruding piece.

Claims (1)

[Claims for Utility Model Registration] A number of slats 1 for blind curtains having crank pins 2 fixed at their left and right ends, which are operated to move vertically within an opening of a building and centered around the crank pins 2. A slat 1 that is rotated in parallel, a crank arm 7 that is fixed to the tip of each crank pin 2 that projects from one end of each slat 1 and projects at the same angle in the front or rear direction, and each crank arm. A large-diameter engaging portion 20 fixed to the outer end of a shaft 8 fixed to the outer wall surface of the distal end of the slat 7 and the inner wall surface of the opening of the building in which each of the slats 1 is installed is operated in the front-rear direction. An opening/closing guide 10 made of a vertically elongated beam material with a substantially U-shaped cross section that is freely provided, and a guide groove 11 inside the opening/closing guide 10.
The entrance opening 11a is provided with an opening/closing guide 10 formed narrower than the guide groove in the inner part thereof, and each engaging part 20 has its shaft 8 located within the opening 11a so that the opening/closing guide 10 When the opening/closing guide 10 is inserted into the guide groove 11 of the opening/closing guide 10 and moved in the front-rear direction, each shaft 8 is pushed against the wall surface of the opening 11a, and the respective slats are inserted through the crank arm 7 and the crank pin 2. In the driving structure of a slat for a blind curtain in which the slat 1 rotates to open and close, each of the engaging parts 20 is formed in an elliptical shape, and the length of the diameter in the short axis direction is equal to the length of the opening width of the opening part 11a. In addition, projecting pieces 21 consisting of small protrusions are integrally formed on the left and right outer peripheral wall surfaces through which the minor axis of the diameter of each engaging portion 20 passes, and each slat 1 is attached to the upper part of the opening of the building. In the horizontally rotated and superimposed position, each engaging portion 20 is
Each protruding piece 21 whose long axis or short axis of each diameter forms an inclination angle parallel to each other and faces vertically.
1. A drive structure for a slat for a blind curtain, wherein the positions of the engaging portions 20 are shifted from the front to the rear of the outer peripheral wall surface of each of the engaging portions 20 that are vertically opposed to each other.