JPH035680Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Technical field of the invention This invention is applicable to blinds, curtains,
This invention relates to a screen winding device with a torque limiter mechanism for winding up and storing various screens such as lightweight shutters, tents, and projection screens, or for unfolding and using the windings.

(b) Background of the invention Generally, when this type of manual screen is raised or lowered, the screen may hit a foreign object (obstruction) while the screen is moving up or down, causing the screen to stop moving up or down.

In this case, the user manually pulls the operating string to raise and lower the screen, and when the screen hits an obstacle, additional force is applied to move it up and down. The screen sagged to a large extent, resulting in unstable lowering operation, and during upward movement, various parts of the winding device were damaged, and the screen itself was sometimes damaged.

(c) Purpose of the invention Therefore, this invention is a screen winding device equipped with a torque limiter mechanism that prevents damage to each part of the winding device and the screen itself even if the screen hits an obstacle when the screen is raised or lowered. The purpose is to provide a removal device.

(d) Summary of the invention This invention is equipped with a locking stop mechanism that is linked to the loosening of the screen when the screen is lowered, and a torque limiter mechanism that absorbs the temporary overload of the screen when it is raised or lowered. The present invention is characterized in that it is a screen winding device with a torque limiter mechanism that has a protective function for each part of the winding device and the screen itself.

(e) Effects of the invention According to this invention, there is a torque limiter that allows idling to absorb high torque in response to an unexpected pause while the screen is rising, and a winding limiter that allows for idle rotation in response to an unexpected pause while the screen is descending. It is equipped with a locking stop mechanism that restricts the rotation of the shaft, so if the screen hits an obstacle and is restricted from moving upward while the screen is moving upward, this torque limiter mechanism will operate to stop the rotation of the manual pulley. Since the manual pulley can be idled to absorb the manual output, an excessive load is not applied and each part of the winding device and the screen itself are not damaged.

Additionally, if the screen hits an obstacle during its downward movement and its downward movement is restricted, the locking stop mechanism is activated immediately and restricts the rotation of the winding shaft, so the manual pulley also stops rotating at the same time. Been,
Prevent excessive loads from occurring.

Therefore, in the case of a control string that rotates a manual pulley, if the screen hits an obstacle,
When the screen is raised or lowered, the pulling force suddenly becomes lighter, and when the screen is lowered, the screen stops lowering, so the user can immediately sense any abnormality during the raising or lowering operation and immediately take appropriate measures to prevent the screen from raising or lowering. This eliminates the need to apply additional unreasonable pulling force via this operating string.

(F) Embodiment of the invention An embodiment of the invention will be described below in detail based on the drawings.

The drawings show, as an example of a screen winding device with a self-locking mechanism, a winding device for a horizontal blind that provides sun protection and light protection.
In the figure, a winding device 1 for this horizontal blind
is attached to one end of a winding shaft 2 that winds up and down a large number of horizontal slats (not shown) arranged in the shape of a blind, and includes a manual pulley 3, a torque limiter mechanism 4, and its torque limiter adjustment. Mechanism 5 and spring-clutch self-locking mechanism 6
It is composed of a planetary gear reduction mechanism 7, a gear case 8 that houses and holds these, and an auxiliary case 9 thereof.

The manual pulley 3 described above is constructed by integrally connecting a first connecting ring 10 and a second connecting ring 11 that are divided into left and right parts, and these connecting rings 10 and 11 have a large diameter part and a small diameter part. It is formed into a stepped cylinder with
The inner end surface of the large diameter portion has a tapered surface that expands outward, and a small protrusion 12 for securing a string is provided protruding in the circumferential direction, and these are opposed to each other in the inner end surface of the small diameter portion in the circumferential direction. A protrusion 13 and an engaging portion 14 are respectively formed to prevent rotation of the connecting rings 10 and 11, and a torque limiter mechanism 4, which will be described later, is provided in the circumferential direction of the outer end surface of the large diameter portion of the first connecting ring 10. A large number of engagement recesses 15 are formed.

An operating string 16 for rotating the pulley 3 is hooked to the manual pulley 3 configured as described above, and is suspended downward from the lower opening 17 of the cases 8 and 9. By pulling down the operation string 16 in the forward and reverse directions, the rotational output is transmitted to the winding shaft 2 via the self-locking mechanism 6 and the planetary gear reduction mechanism 7 connected thereto.

The torque limiter mechanism 4 described above has a manual pulley 3 inserted onto the clutch body 18 which is inserted through one end of the winding shaft 2, and the manual pulley 3 and the clutch body 18 are urged into contact with each other. Reference numeral 18 is provided on a cylindrical shaft having a large diameter shaft portion and a small diameter shaft portion, and a semicircular shaft portion 19 having a slightly fan-shaped arc shape is protruded from the outer end surface of the large diameter shaft portion. is provided as a part of a self-locking mechanism 6 which will be described later. Further, on the inner end surface of the large-diameter shaft portion, an engagement convex portion 20 for releasably connecting the above-mentioned engagement recess 15 is provided to protrude in the circumferential direction, and corresponds to the above-mentioned engagement recess 15.
A small diameter portion 21 for bushing is provided at the end of the small diameter shaft portion.
The clutch body 18 has a male thread 22 screwed therein, and the manual pulley 3 described above is mounted on the shaft of the clutch body 18.
and a torque limiter adjustment mechanism 5, which will be described later.

The torque limiter adjustment mechanism 5 described above first inserts the manual pulley 3 into the small diameter portion of the clutch body 18, and then sequentially inserts the wave washer 2 from the outside.
3, the flat washers 24 and the wave washers 23 alternately, and finally insert the fixing double adjustment nuts 25, 25 into the male screws 22 of the clutch body 18.
At the same time, the manual pulley 3 is mounted on the small diameter shaft portion by screwing the manual pulley 3 onto the small diameter shaft portion, and the engagement recess 15 of the manual pulley 3 is forcefully engaged with and connected to the engagement protrusion 20. As a result, the clutch body 18 and manual pulley 3 are normally prevented from rotating and are connected together.

In this case, if a temporary overload is applied to the winding shaft 2 and the clutch body 18 side is fixed, the rotational output of the manual pulley 3 side will be applied to the above-mentioned engagement convex portion 20 to allow idling. , the engagement recess 15 separates and rotates.

The engagement and disengagement state is adjusted by the tightening pressure of the torque limiter adjustment mechanism 5 described above.

In the figure, 26 is a bush.

The above-mentioned self-locking mechanism 6 has a self-locking function that automatically locks the raised position of the slat when the slat suspension string 27 is wound up and the lowered position of the slat after it is deployed and used, depending on the weight of the slat. It is composed of a fixed ring 28, a locking spring 29, the aforementioned half-moon shaft portion 19 of the clutch body 18, and the half-moon shaft portion 31 of the sun gear 30, which will be described later.

The above-mentioned fixed ring 28 has a rotation prevention protrusion 3 on its outer peripheral surface.
2 are provided protrudingly and are fitted and fixed to one side of the gear case 8, and a locking spring 29, which will be described later, is fitted onto the inner circumferential surface of this fixed ring 28.

The above-mentioned locking spring 29 is formed in a coil shape, and the outer peripheral surface of this spring 29 is connected to the above-mentioned fixing ring 28.
The spring 29 is fitted in sliding contact with the inner circumferential surface of the spring 29, and projecting protrusions 33, 33 that protrude in the inward radial direction opposite to each other are provided at both ends of the spring 29. It is in a state of being integrated with the fixed ring 28 due to the biasing force in the direction of diameter expansion.

Then, on the inner periphery of this spring 29, a slight gap is formed between the outer circumferential surface of both the above-mentioned half-moon shaft portions 19, 31 and the inner circumferential surface of the spring 29, and these half-moon shaft portions 19, 31 is fitted within the spring 29.

The half-moon shaft portion 19 of the clutch body 18 is inserted into the spring 29 from one end surface on the front side thereof.

The arc-shaped half-moon shaft portion 31 protruding from one end surface of the sun gear 30 is inserted into the spring 29 from the other end surface on the rear stage side in correspondence with the aforementioned half-moon shaft portion 19 on the front stage side. . Incidentally, a sun gear corresponding to a planetary gear of a planetary gear reduction mechanism 7, which will be described later, is carved on the circumferential surface of the other end of the sun gear 30, and is provided for both a sun gear and a self-locking function.

Furthermore, on the inner circumferential surface of the spring 29, between the opposing surfaces of the half-moon shaft portions 19 and 31 inserted into each other from both sides, the spring 2
Both protrusions 33, 33 of 9 are interposed therebetween, and are opposed to each other with an allowable space 34 that allows initial rotation of these protrusions 33, 33 in the circumferential direction.

In this case, even if the clutch body 18 is rotated in either the forward or reverse direction, the protrusion 3 on one side or the other side
3, the half-moon shaft portion 19 of the clutch body 18 is inserted into one side of the corresponding spring 29 in order to initially rotate in the direction of loosening the spring 29. On the other hand, the half-moon shaft portion 3 of the sun gear 30 facing on the opposite side
1 is the protrusion 3 for both forward and reverse directions.
3 into the other side of the spring 29, which is set in the direction of tightening the spring 29.

Moreover, the reason why the gap is set between the outer circumferential surface of these half-moon shaft parts 19, 31 and the inner circumferential surface of the spring 29 is that the diameter of the spring 29 is reduced by the lock release operation described later, and the fixing action of the spring is released. This is to allow the inner and outer circumferential surfaces of the spring 29 to uniformly restrict diameter reduction in the circumferential direction without causing uneven contact. 35,3
Reference numeral 6 represents a spring regulating holding portion.

The above-mentioned planetary gear reduction mechanism 7 includes the above-mentioned sun gear 30, first to fourth planetary gears 37, 38, 39, 40 that mesh with the sun gear 30, and a first carrier that holds these first to fourth planetary gears 37 to 40. 41, a second carrier 42, and an internal gear 43 carved on the inner peripheral surface of the gear case 8 to mesh with the planetary gears 37-40.

Of these, the first carrier 4 is fitted into and integrally fixed to the shaft portion of the winding shaft 2, which has a square cross section, and the low torque rotational force output from the manual pulley 3 side is applied to the sun gear 30 and the first to fourth shafts. Planetary gear 37
After the torque is decelerated to a predetermined high torque output via the torque output terminal 40, the torque is transmitted to the winding shaft 2 via the first carrier 41 for this output. Furthermore, these carrier 4
1 and 42 are integrally connected through a connecting pin 44 and a corresponding connecting hole 45.

Figure 3 shows a lock-off state in which the rotation of the winding shaft 2 is allowed; this means that the manual pulley 3 rotates in the normal clockwise direction, which rotates the winding shaft 2 and holds the slat in a predetermined position. The unlocking operation at this time is based on the output from the manual pulley 3, and the half-moon shaft portion 19 on the front stage side is moved downward to the position.
In the allowable space 34, the spring 29 is initially rotated in the direction in which it should be loosened via the protrusion 33 on one side to unlock the spring 29 fixed to the fixed ring 28. Rotation relative to the portion 31 is allowed and power is transmitted to the winding shaft 2 side.

Figure 4 shows the lock-on state that restricts the rotation of the winding shaft 2. This is a lock-on state in which the slat is locked on to stop the slat at that position when it is moved upward to a predetermined position. When the rotation of the pulley 3 is stopped, the rotation of the winding shaft 2 is stopped, but at this time, a counterclockwise rotational force is applied to the winding shaft 2 to cause it to further descend due to the weight of the slat, and this action Although the rear half-moon shaft portion 31 attempts to rotate in response to the force, in the early stage of rotation of this half-moon shaft portion 31, the protrusion 3 on one side
Since the spring 29 is rotated in the diametrically expanding direction via the spring 29, the spring 29 is integrally fixed to the fixed ring 28, and the rotation of the rear half-moon shaft portion 31 is restricted. Therefore, a self-locking operation is automatically performed by the reaction force of the rear half-moon shaft portion 31 corresponding to the load on the slat, and the counterclockwise rotation of the winding shaft 2 is naturally locked.

As a result, the slat is automatically self-locked at each of the up stop position and the down stop position based on the rotation stop operation of the manual pulley 3.

Furthermore, since the self-locking mechanism 6 described above is provided symmetrically with respect to the circumferential direction, the manual pulley 3
Similar locking and unlocking operations are performed when the lock is reversed.

Note that the locking spring 29 is locked and unlocked by the sliding action of the outer peripheral surface of the spring that expands and contracts, so the linear cross section of the spring has a rectangular cross section, such as a rectangular cross section, that can provide a sufficiently large sliding resistance. The shape is suitable.

In addition, the winding shaft 2 corresponding to each of the above-mentioned hanging cords 27 of the slats is equipped with a winding pulley equipped with a loosening stop mechanism (not shown) that controls the descent of the hanging cord in conjunction with the loosening of the hanging cord. 46... are arranged. Further, an opening/closing string (not shown) for adjusting the opening/closing angle of the slat is suspended from the other end of the winding shaft 2.

In the figure, 47 is a locking claw of the gear case, and 48 is a locking portion thereof.

The horizontal blind winding device configured in this way operates by pulling the operation string 16 and pulling the manual pulley 3.
By rotating the winding shaft forward or backward, the winding shaft 2 is rotated via the planetary gear reduction mechanism 7 interlocked with the winding shaft 2, and the slat is moved up and down to a predetermined height position. At this point, the rotation of the manual pulley 3 is stopped, and the self-locking mechanism 6 is activated to automatically complete the lifting and lowering operation of the slat.

Additionally, if this slat gets caught by a foreign object while it is rising, an overload (high torque) will be applied to the slat in the lifting direction whose upward movement is restricted, but the torque limiter mechanism 4 will operate and the clutch body 18 will be On the other hand, since the manual pulley 3 slips and rotates idly to absorb high torque, the slat and the winding device are protected from damage to parts such as the self-locking mechanism.

Additionally, if the slat hits a foreign object and is restricted from descending during the lowering operation of the slat, the suspension string 27 is loosened at the same time.
The loosening stop mechanism 7 is activated to restrict the rotation of the pulled-down operation string 16, and the user immediately senses an abnormality in its elevation.

[Brief explanation of drawings]

The drawings show an embodiment of this invention, and FIG. 1 is an exploded perspective view showing a winding device for a horizontal blind. FIG. 2 is an enlarged longitudinal cross-sectional view. 3 and 4 are enlarged sectional views taken along the line AA in FIG. 2, showing the self-locking mechanism in use. DESCRIPTION OF SYMBOLS 1... Horizontal blind winding device, 2... Winding shaft, 3... Manual pulley, 4... Torque limiter mechanism, 7... Planetary gear reduction mechanism, 15... Engagement recess, 16... Operation string, 18... Clutch body, 20... Engagement convex portion.

Claims (1)

[Claims for Utility Model Registration] Provided with a screen loosening stop mechanism that restricts the rotation of the winding shaft 2 in conjunction with loosening of the screen, and rotating a manual pulley 3 attached to the winding shaft. A screen winding device with a torque limiter that controls the winding of the screen via a planetary gear reduction mechanism 7, the screen winding device having a torque limiter that controls the winding of the screen via the manual pulley in response to a temporary overload of the screen when winding the screen via the manual pulley. 1. A screen winding device with a torque limiter, comprising a torque limiter mechanism 4 having a clutch member disposed between a manual pulley and the planetary gear reduction mechanism to allow idle rotation of the screen winding device.