JPH017839Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a transmission gear for a slat pivot shaft of a blind.

Generally, the slat pivot shaft of a blind is rotatable through a certain angle, and further rotation is prevented by a stopper. In this way, when the slats of the blind are opened and closed by rotating, even after the slat rotation shaft reaches its rotation limit, the slat rotation is continued in preparation for an erroneous operation in which the slat rotation shaft is forcibly rotated further by operating the operating rod. It is desirable to absorb overload transmission in the transmission system of the shaft.

Conventional techniques and their problems Conventionally, this has been achieved by using a slippably frictionally engaged actuating medium under the pressure of a spring, or by a slippably frictionally and meshingly paired actuating medium in a similar manner. It relies on the additional integration of the medium into the drive system of the slat-swivel shaft of the blind. According to this, the additional incorporation of said working medium complicates the construction accordingly.

Conventionally, when a load above a certain level is applied to the slat rotation transmission system, a worm wheel with teeth made of an elastic material is attached to the rotating shaft end of each slat to cause the transmission system to idle. There is also known a configuration in which worms that mesh with the worm foil are attached to required locations.
However, in this conventional system, a toothed elastic worm wheel, which is a transmission means capable of idling, is attached to the rotating shaft end of each slat end, so even after a certain slat reaches its turning limit, the slat turning shaft continues to rotate. may be forcibly rotated by operating the operating rod. Therefore, when a force above a certain level is applied between the worm and the worm wheel, the worm wheel's elastic teeth rotate idly, but the entire slat rotation transmission system cannot effectively absorb the overload. Can not.

Therefore, in the present invention, the driven gear itself, which constitutes a part of the transmission system of the slat swivel shaft of the blind, also serves as a safety device to absorb the overload during operation of the slat swivel shaft, and therefore, it eliminates the need for the conventional additional working medium. The object of the present invention is to provide a transmission gear for a slat swivel shaft of a blind, which can absorb overloads in a structurally simple manner.

In addition, the present invention effectively achieves overload absorption for the entire slat rotation transmission system, and furthermore, even though the driven gear that also serves as an overload absorption safety device is a movable type that can quickly respond to overload absorption, it is possible to It is an object of the present invention to provide a transmission gear for a slat rotating shaft of a blind, which can perform stable transmission operation under load.

Means for Solving the Problems The above objects of the present invention are achieved by a transmission gear having the following configuration.

A driving gear formed by a worm arranged on the input end side of the slat turning shaft of the blind, and a helical tooth connected to the input end of the slat turning shaft and meshing retractably with the worm driving gear under pressure from a spring. A transmission gear for a blind slat swivel shaft comprising a driven gear by a gear, in which a single-side bearing for the driven gear is arranged on the side of the worm drive gear, and the spring is arranged on the opposite side. a transmission gear of a slat swivel shaft of a blind, which presses the driven gear toward the single-sided bearing;

In this specification, "single-side type bearing" means
This is a bearing that supports the driven gear around its half circumference. The same applies to statements in the scope of claims for utility model registration.

Embodiments Next, embodiments of the present invention will be described with reference to the accompanying drawings.

A worm-based driving gear 2 is disposed on the input end 1a side of a blind slat (not shown) swing shaft 1. A driven gear 4 made of a helical gear is retractably engaged with the worm drive gear 2 under pressure from springs 3, 3 disposed on the opposite side of the gear 2, and the driven gear 4 is engaged with the slat. Connected to the input end 1a of the turning shaft 1. In the illustrated case, the input end of the shaft 1 is connected to a socket part 8 integral with a driven gear 4 by a helical gear under a spline connection. The driven gear 4, which is a helical gear, is supported only on this side by single-receiver type bearings 5, 5 disposed on the side of the worm drive gear 2. Under this pivot, the springs 3, 3 press the driven gear 4 on the side of the bearings 5, 5. In addition, the input end 1 of the slat rotation shaft 1
a forms a free end. Although the single-side bearings 5, 5 are arranged only on the upper side in the figure, they may be arranged on the lower side so as to be symmetrical with this. An operating rod 6 is connected to the worm drive gear 2 via a universal joint 7.

According to the present invention, when the slat turning shaft 1 of the blind does not reach its rotation limit, that is, under normal load, the driven gear 4, which is a helical gear, rotates as the worm driving gear 2 rotates. rotation reaches its limit. In other words, when an overload occurs, even if the worm drive gear 2 is forcibly rotated, the helical tooth side surface of the driven gear 4 by the helical gear slides on the tooth side surface of the worm drive gear 2, and the spring 3 The driven gear 4 is displaced toward the side opposite to the worm drive gear 2 against the force. That is, it only slips and is not forcibly rotated along with the driving gear 2. In this way, the overload of the slip rotation transmission system is absorbed by the slip.

Effects of the invention As described above, according to the present invention, the overload of the slat swing shaft drive system can be eliminated by the slip of the driven gear 4 itself by the helical gear, so that the overload of the driven gear 4 by the helical gear can be eliminated. It also serves as a safety device against overload absorption, and can achieve the purpose of overload absorption with a simple structure.

Furthermore, in the present invention, a driven gear made of a helical gear that also serves as an overload absorption safety device is connected to the input end of the slat swing shaft, and a worm driving gear that meshes with the driven gear is arranged at the input end of the shaft. Therefore, the above-mentioned overload absorption is performed on the input end side of the slat rotation shaft, and overload absorption is effectively achieved for the entire slat rotation transmission system.

Furthermore, in this invention, on the side of the worm drive gear,
A single bearing type bearing is arranged for the driven gear that meshes with this, and a spring is arranged on the opposite side to press the driven gear towards the single side bearing type, so overload absorption and safety are ensured. Regardless of whether the driven gear that also serves as the device is a movable type that can quickly absorb overload, it can be stably supported by a single-side bearing under the pressure of the spring under normal load.
Therefore, stable transmission operation can be achieved under normal load.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a plan view, FIG. 3 is a side view, and FIG. 4 is a slope view of the driving gear and driven gear portions in the same embodiment. 1 is a slat rotating shaft, 2 is a worm driving gear, 3 is a spring, 4 is a driven gear with a helical tooth gear, and 5 is a single-side type bearing.

Claims (1)

[Scope of utility model registration request] A driving gear formed by a worm arranged on the input end side of the slat turning shaft of the blind, and a helical tooth connected to the input end of the slat turning shaft and meshing retractably with the worm driving gear under pressure from a spring. A transmission gear for a blind slat swivel shaft comprising a driven gear by a gear, in which a single-side bearing for the driven gear is arranged on the side of the worm drive gear, and the spring is arranged on the opposite side. a transmission gear of a slat swivel shaft of a blind, which presses the driven gear toward the single-sided bearing;