JPH0354312Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) This invention relates to a dead weight fall prevention device for preventing the falling of blind slats, roll blinds, rolled-up curtains, roll-up blinds, etc. due to their own weight. It is something.

(Prior art) Conventionally, for example, the lifting cord hanging down from one side of the headbox is pulled down and the bottom rail is pulled up to pull up the slats, and the lifting cord hanging down from the headbox is pulled into the headbox by the weight of the bottom rail and slats. For blinds in which the slats are lowered by lowering the bottom rail by retracting the slats, the headbox is equipped with a dead weight drop prevention device to prevent the slats from being pulled into the headbox when the lifting cord is not operated. This prevents the slats from falling due to their own weight when the lifting cord is not operated.

(Problem to be solved by the invention) The conventional slat self-weight drop prevention device as described above has a method of pulling the lifting cord hanging down from the head box straight down when lifting the slat from a state in which the device is in operation. If the bottom rail is pulled up and the slat is pulled up, but if the slat is to be lowered, the lift cord is pulled diagonally to one side in the longitudinal direction of the headbox (along and approximately parallel to the slat) to activate the self-weight drop prevention device. In this state, it was necessary to release the lift cord and draw it into the head box using the weight of the slats and bottom rail.

However, depending on the mounting position of such a self-weight drop prevention device in relation to the head box, when the lifting cord is pulled diagonally downward, the wall or window frame on the side of the blind may become an obstacle, hindering the lifting and lowering operation of the slat. Something was coming.

Structure of the invention (Means for solving the problems) In order to solve the above problems, this invention has a structure in which a clamping body is guided by a guide groove and moves up and down in a straight line in a case attached to an upper frame. A lifting cord is inserted into the case and is suspended from the upper frame body and is always urged upward, and a clamping body is engaged with the lifting cord so as to move up and down as the cord moves; The case is provided with a clamping member that clamps the lifting cord between a clamping body that moves up and down as the lifting cord moves, and when the lifting cord is moved downward, it is moved to a position where it is separated from the clamping member. The clamping body is not locked and released alternately, but the upward movement of the lifting cord accompanying this release operation causes the clamping body to move upward and clamp the lifting cord again between it and the clamping member. The cam mechanism is provided between the clamping body and the case.

(Function) By the above means, the lifting cord 7 is always clamped between the clamping body 17 and the clamping member 13, and is prevented from being drawn into the upper frame 2. From this state, the lifting cord 7 is moved downward. When pulled downward, the clamping body 17 is locked in a position separated from the clamping member 13 by the cam mechanisms 20 and 25, and the lifting cord 7 can be freely drawn into the upper frame 2, and the lifting cord 7 can be further moved downward. When pulled, the operation of the cam mechanisms 20 and 25 is released, and the lifting cord 7 is again sandwiched between the clamping body 17 and the clamping member 13.

(Embodiment) Hereinafter, an embodiment in which this invention is embodied in a blind will be described with reference to the drawings. As shown in FIG. A number of tiers of slats 4 are suspended and supported, and a bottom rail 5 is suspended and supported from the lowest tier of the ladder cord 3. The upper end of the ladder cord 3 is supported by an angle adjustment shaft (not shown) within the head box 2, and the angle adjustment shaft can be rotated by operating two angle adjustment cords 6 hanging from one side of the head box 2. , the angles of each slat 4 can be adjusted in the same phase via the ladder cord 3.

A lifting cord 7 passes through each slat 4 near the supporting portion of the ladder cord 3, and one end of the lifting cord 7 is connected to the bottom rail 5, and the other end is connected to the bottom rail 5 after being guided in one direction inside the head box 2. , is suspended below the head box 2 from a dead weight drop prevention device 8 provided at one end of the head box 2. The dead weight fall prevention device 8 prevents the slat 4 from falling due to its own weight when the lifting cord 7 is not operated.

Next, the structure of the self-weight drop prevention device 8 will be explained according to FIGS. 1 to 9. As shown in FIG. 1, the case 9 fixed to one end of the head box 2 is
It consists of two side plates 10 and 11 shown in FIG. On one side of the upper part of the case 9, there is a first
Connect the lift cord 7 to the head box 2 as shown in the figure.
A guide roller 12 is rotatably supported to guide the guide roller 12 into the case 9, and below the guide roller 12 is a clamping surface 13 for clamping and fixing the lifting cord 7 between the guide roller 12 and a clamping roller 15 to be described later. It is formed as a downward slope. On the other side of the case 9, an engagement surface 14 having a sawtooth cross section is formed at a position facing the clamping surface 13, and is adapted to be engaged with a clamping roller 15, which will be described later.

In order to support the sandwiching body 17 consisting of the sandwiching roller 15 and the guide roller 16 below it so that it can move up and down in a straight line between the side plates 10 and 11, one of the side plates 10
As shown in FIG. 5, a linear guide groove 18 is formed in the vertical direction on the inner surface, and a guide groove 19 is similarly formed on the other inner surface of the side plate 11, as shown in FIG. Further, a guide recess 20 shallower than the guide groove 19 is formed around the guide groove 19 of the side plate 11 in order to guide a cam 25 to be described later.

The pinching roller 15 and the guide roller 16 that constitute the pinching body 17 are rotatable at a predetermined interval, that is, at a distance that allows the lifting cord 7 to be inserted through the support member 21 connected at the upper part, as shown in FIG. The engaging surface 14 is supported on the circumferential surface of the nipping roller 15.
A concave and convex portion 22 is formed that engages with the convex and concave portions. A support shaft 23a for rotatably supporting the nipping roller 15 on the support member 21 is protruded to both sides of the support member 21, and its tips are protruded into the guide grooves 18, 19 of the side plates 10, 11 to support the guide roller 16. The support shaft 23b for rotatably supporting the support member 21 is
It projects only toward the side plate 10 side, and its tip projects into the guide groove 18. Therefore, the sandwiched body 17
Both ends of the support shaft 23a are guided by the guide grooves 18 and 19, and the support shaft 23b is guided by the guide groove 18, so that the support shaft 23b is supported so as to be movable linearly only in the vertical direction along the guide grooves 18 and 19. has been done.

On the outside of the clamping body 17 on the side plate 11 side, as shown in FIG. The cam 25 is supported so as not to rotate along with the deposition roller 15, and the cam 25 is
As shown in the figure, it is located within the guide recess 20. The upper part of the guide recess 20 has a width that allows the cam 25 to be inserted only in the vertical direction, and is formed in a straight line in the vertical direction like the guide groove 19, and the lower part has a width that allows the cam 25 to rotate. is formed. Also, a first cam guide 26 is provided on one side of this guide recess 20, and a second cam guide 27 is provided on the lower edge.
is projected to operate a cam 25 within the guide recess 20. As shown in FIG. 1, the lifting cord 7 for such a self-weight drop prevention device 8 is guided downward through the device 8 from inside the head box 2 by a guide roller 12, and is connected to the clamping roller 15 and the clamping surface. 13 and between the nipping roller 15 and guide roller 16, and is suspended below the device 8.

Next, the operation of the dead weight drop prevention device 8 as described above will be explained.

Now, as shown in FIG. 1, when the lifting cord 7 is clamped between the clamping surface 13 and the clamping roller 15, the weight of the slat 4 and the bottom rail 5 causes the lifting cord 7 to move in the downward direction of the slat. That is, when attempting to move in the direction of arrow A in the figure, the nipping roller 15 engages with the engagement surface 14 and moves into the guide groove 18,
It attempts to move upward along 19. However, the lifting cord 7 that the pinching roller 15 is trying to move upward is more strongly pinched between the pinching roller 15 and the pinching surface 13, so that the lifting cord 7
The movement of the slats 4 is prevented, and the slats 4 are prevented from falling under their own weight. In this state, the cam 25 is vertically located above the guide recess 20, as shown in FIG.

In order to raise and lower the slat 4 suspended and supported at a predetermined position, first pull the lifting cord 7 hanging down from the self-weight drop prevention device 8 downward.
As the nipping roller 15 is moved downward, the nipping roller 15 is rotated in the direction of arrow B in FIG. Then, the cam 25 moves downward within the guide recess 20, and as shown in FIG. 25 is engaged with the second cam guide 27 and rotated slightly as shown by the chain line in the figure. In this state, the clamping roller 15 is detached from the engagement surface 14 and becomes freely rotatable, so that the lifting cord 7 can be freely pulled out downward.If the lifting cord 7 is pulled out downward, the slat 4 can be moved to a desired position. It can be pulled up.

In this state, when the clamping body 17 is moved upward by using the weight of the slat 4 and the bottom race 5 to slightly pull the lifting cord 7 into the self-weight drop prevention device 8, the cam 25 is first moved to one side. The protrusion 24a abuts on the first cam guide 26 and rotates, and as shown in FIG. Since it is no longer possible to move upward, it is no longer possible to move upward, and the clamping body 17 is therefore prevented from moving downward at the position shown in FIG.

Even in this state, the clamping roller 15 does not engage with the engagement surface 14 and remains rotatable, so the lifting cord 7 can be freely drawn into the device 8 using the weight of the slat 4. The slat 4 can be lowered to a desired position.

After lowering the slat 4 to the desired position, when the lifting cord 7 is pulled downward, the clamping body 17 is moved slightly downward, and the cam 25 hits the second cam guide 27 as shown in FIG. Rotate in contact. From this state, when the lifting cord 7 is drawn into the dead weight drop prevention device 8 by the weight of the slat 4, the clamping body 17 is moved upward by the movement of the lifting cord 7. Then, as shown in FIG. 9, the cam 25 contacts the first cam guide and is rotated, and in this state moves to the upper part of the guide recess 20, resulting in the state shown in FIG. 4.

As the sandwiching body 17 moves upward, the sandwiching roller 15 is moved upward, and eventually the sandwiching roller 1
5 engages with the engaging surface 14 and moves upward while rotating to clamp the lifting cord 7 between it and the clamping surface 13 as shown in FIG. Then, the lift code 7
The slat 4 prevents further movement of the lifting cord 7, and the above-mentioned operation is instantaneously carried out within the device 8 when the lifting cord 7 is pulled into the dead weight drop prevention device 8. It is suspended and supported at a desired position.

As described above, this self-weight drop prevention device 8
As shown in the figure, when the lifting cord 7 is prevented from being pulled in, the lifting cord 7 is pulled downward to move the clamping body 17 downward, and the cam 25 is moved to the position shown in Figure 6. The cord 7 can be freely pulled out to pull up the slat 4. From this state, the weight of the slat 4 is used to move the clamping body 17 slightly upward, and the cam 25 is moved to the seventh position.
When engaged in the position shown in the figure, the lifting cord 7 can be freely drawn into the head box 2 and the slat 4 can be lowered. After raising and lowering the slat 4 to a desired position, the lifting cord 7 is pulled downward again to rotate the cam 25 as shown in FIG. 17 is moved upward, the lifting cord 7 is clamped and fixed between the clamping roller 15 and the clamping surface 13, preventing movement of the lifting cord 7, and the slat 4 is suspended and supported at a desired position. be done.

Therefore, this self-weight drop prevention device 8 can raise and lower the slats 4 and operate and release the dead weight drop prevention device 8 by always operating the lifting cord 7 in the vertical direction. The window frames, walls, etc. of the slats do not become obstacles, and the slats can be raised and lowered easily and quickly.

Effects of the invention As detailed above, this invention
By operating the lifting cord 7 in the vertical direction, it is possible to prevent the lifting cord 7 from being pulled out from the upper frame 2 and into the upper frame 2, or from being pulled into the upper frame 2. The walls and window frames on the sides of the frame body 2 do not become obstacles, and the lifting cord 7 can be operated easily and quickly. In the present invention, as described above, the cam mechanism is actuated by the linear vertical movement of the clamping body, and all operations are performed, so that the operation is smooth and provides an excellent effect without causing any malfunction.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing an embodiment of a blind weight drop prevention device that embodies this invention;
The figure is also a longitudinal cross-sectional view showing a state in which the lift cord is released from the clamp, Figure 3 is a perspective view of the clamp body, Figures 4 and 5 are front views showing the inner surface of the side plate, and Figures 6-
FIG. 9 is an explanatory diagram showing the operating state of the cam mechanism,
Figure 0 shows the front of a blind that embodies this idea. Head box...2, Slat...4, Lifting cord...7, Weight drop prevention device...8, Case...9, Clamping surface...13, Clamping roller...15,
Guide roller...16, clamping body...17, guide recess...20, spindle...23a, cam...25.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A clamping body 1 inside the case 9 attached to the upper frame 2.
7 is guided by guide grooves 18 and 19 so as to be vertically movable in a straight line, and the lifting cord 7, which is suspended from the upper frame body 2 and is normally biased upward, is attached to the case 9.
and the clamping body 17 that moves up and down as the lifting cord 7 moves. A clamping member 13 for clamping the lifting cord 7 is provided in the case 9,
By operating the lifting cord 7 downward, the clamping member 1 is
The clamping body 17 is alternately locked to a position away from the clamping member 13 and released, and as the lifting cord 7 moves upward due to this releasing operation, the clamping body 17 moves upward and engages the clamping member 13. The cam mechanism 2 is adapted to clamp the lifting cord 7 again between the
0.25 is provided between the clamping body 17 and the case 9. 2 The clamping body includes a clamping roller 15 whose both ends are rotatably supported by the support member 21, and the clamping roller 1.
5 and a guide roller 16 rotatably supported by the support member 21 at a distance that allows the lifting cord 7 to be inserted therebetween. Prevention device. 3. The cam mechanism consists of a guide recess 20 provided on the side plate of the case 9 and a cam 25 provided on one side of the clamping body 17. The cam mechanism prevents the dead weight of blinds, etc., from falling as described in claim 1 of the utility model registration claim. Device.