JPH035679Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Technical field of the invention This invention is applicable to blinds, curtains,
The present invention relates to a screen winding device with a self-locking mechanism that winds up and stores various screens such as lightweight shutters, tents, and projection screens, or unwinds and unfolds them for use.

(b) Background of the invention Conventionally, this type of screen winding device drives the winding shaft that winds up the screen via a speed reduction mechanism, and this drives the winding or unfolded screen. In order to fix the screen at the stop position, the screen is fixed using various winding shaft rotation stopping means, thereby preventing the screen from slipping off due to its own weight (for example,
3994).

However, in the case of such a screen winding device, the locking spring is disposed between the carrier of the planetary gear reduction mechanism and the fixed member fixed to the winding shaft. The high power generated by the planetary gear reduction mechanism is applied to this locking spring and is transmitted to the winding shaft via this spring, so this locking spring concentrates the overload caused by the high power. This causes the spring clutch mechanism to be easily damaged, resulting in a decrease in safety as a spring clutch mechanism and a shortened lifespan.

(c) Purpose of the invention Therefore, the object of this invention is to provide a screen winding device with a self-locking mechanism that has stable performance that prevents overload from being applied to the locking spring.

(d) Summary of the invention This invention has a self-locking mechanism that transmits the output from the manual pulley that operates the screen up and down and locks the output from the winding shaft due to the screen's own weight, using the manual pulley and the planetary gear. The present invention is characterized by a screen winding device with a self-locking mechanism, which is arranged between the self-locking mechanism and the deceleration mechanism, and configured so that rotational output operated each time the screen is raised or lowered is transmitted to the self-locking mechanism with low torque.

(e) Effects of the invention According to this invention, for the self-locking mechanism,
Since the rotational output is transmitted as is without being decelerated from the manual pulley, only a light load is applied to this self-locking mechanism, and high output is not applied via the current planetary gear reduction mechanism. do not have.

Therefore, this self-locking mechanism has high safety performance as a spring clutch, can reliably extend the life of the spring and utilize small diameter springs, and can always provide smooth operation as a self-locking mechanism.

In addition, the self-lock mechanism operates to lock the rotation of the winding shaft at the same time as it stops the rotational output of the manual pulley, so the screen's winding and unfolding positions are automatically fixed as appropriate. Ru.

In particular, this self-locking mechanism has a simple structure in which locking and unlocking functions can be obtained by simply using a coiled spring, so that the number of structural members for the clutch function can be reduced.

Furthermore, since the reduction mechanism uses a planetary gear reduction mechanism that is small and provides high output, it does not take up much installation space and is suitable for installation at the end of the winding shaft. becomes compact.

(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 for winding up and down a number of horizontal slats (not shown) arranged in the form 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 consists 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 planetary gear reduction mechanism 7 described above includes the sun gear 30 described above, 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, 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 being decelerated to a predetermined high-torque output via 40, the torque is transmitted to the winding shaft 2 via a 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, and the spring 29 fixed to the fixed ring 28 is unlocked, so that the half-moon shaft on the rear side is released. 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 self-locking mechanism 6 is activated by stopping the rotation of the manual pulley 3, and the lifting and lowering operation of the slat is automatically completed.

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 the drawing]

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. 1... Horizontal blind winding device, 2... Winding shaft, 3... Manual pulley, 6... Self-lock mechanism, 7... Planetary gear reduction mechanism, 16... Operation string, 19, 31... Half moon shaft Part, 28... fixed ring,
29...Lock spring, 30...Sun gear, 34
...Permissible space.

Claims (1)

[Scope of claim for utility model registration] The rotational output of the manual pulley 3 is transmitted to the planetary gear reduction mechanism 7.
The screen winding device transmits power to the winding shaft 2 via a carrier 41, in which a fixed ring 28 is fitted inside the gear case 8 of the planetary gear reduction mechanism, and a locking ring is provided on the inner circumferential surface of the fixed ring. A coiled locking spring is fitted with the outer peripheral surface of the spring 29 in sliding contact, and both ends of the locking spring are provided to protrude inward in the radial direction, and on the inner periphery of the locking spring, The half-moon shaft portion 31 formed at the end of the sun gear 30 of the planetary gear reduction mechanism and the half-moon shaft portion 19 formed at the end on the manual pulley side are arranged opposite to each other in the radial direction, and the outer circumferential surface of these half-moon shaft portions is These half-moon shafts are fitted with a slight gap formed between the inner peripheral surface of the spring and the inner peripheral surface of the spring. Based on the provision of a self-locking mechanism 6 which is formed by interposing both ends of a locking spring across a permissible space 34 that allows initial rotation, the output from the manual pulley side is transmitted, and the output from the winding shaft side. A screen winding device with a self-locking mechanism configured to lock the screen.